China Shenzhen Perfect Precision Product Co., Ltd. company news

I. Machining process of parts The main content of the part machining process is in the modern society. Generally, the machining of parts is carried out in the way of numerical control. Therefore, when machining parts, it is necessary to first understand the relevant processing technology, develop a suitable processing plan, and deepen the discussion and analysis of the part numerical control processing process. First of all, when machining parts, it is necessary to select a suitable CNC machine tool, operate on the CNC machine tool, and determine what the processing procedure is. Then, make a suitable machining plan for NC machining of parts, analyze the drawings of the machined parts, process the precision parts and adopt appropriate machining technology. In the machining of parts, the most important thing is to design the processing technology of parts, which is related to the quality of parts. We should clarify the process steps of parts processing, and confirm the selection of benchmarks, processing tools, fixtures, devices, processing strategies and process parameters to formulate the most suitable processing technology. In addition, we should compile and check the NC programming program of part machining, control the programming error, and improve the programming quality and efficiency. The characteristics of part machining process The machining of parts is generally carried out in the way of numerical control, so it is inevitable to have the characteristics of numerical control processing, and also has its own characteristics. (1) NC machining of parts requires the content of processing technology to be meticulous and detailed. When NC machining parts, a NC machining plan will be prepared in advance, and then the operation will be carried out on the NC machine tool, including the processing program, the selected tool, the processing method and the corresponding processing parameters. These requirements require a detailed and detailed plan when machining parts. The plan will be analyzed, and finally the processing program of the parts will be formed. (2) The CNC machining process of parts is required to be strict and accurate. The mechanical processing technology of parts adopts the form of numerical control processing, which makes the precision and quality of parts processing higher, and the processing process does not require too many people, saving manpower. But on the other hand, the reduction of human intervention makes it impossible to manually adjust parts if problems occur in the processing process. Therefore, the level of mechanical numerical control processing technology of parts is set closely and accurately, There should be no small error. Because of the error, it is likely that the processing technology will not meet the specification and the parts will be discarded, resulting in mechanical accidents. (3) In the process of mechanical NC processing of parts, mathematical calculation shall be carried out for the part graphics and the set value of the programmed size. Because the machining of parts is in the form of numerical control, programming design shall be carried out before machining, the size of parts shall be in geometric form, and the size of parts shall be calculated mathematically. Therefore, optimization design of parts shall be carried out from all aspects during programming. Second, analysis of the design principles of machining process of parts The principle for selecting the positioning datum The positioning datum refers to the surface of the relative position of the part to the machine tool and the cutter when the machining of the part is stopped, while the part uses the most original surface that has not been processed during the initial processing. This is the coarse datum. If the positioning datum that has been processed is used after the initial processing, this is the fine datum. Then, when machining parts, what appearance should be selected as the positioning benchmark, which requires caution when machining parts. What kind of positioning datum to choose will affect the quality of parts processing and the complexity of machine tool fixture construction. What are the principles for selecting the coarse and fine benchmarks? The selection of rough datum shall follow the principle of selecting rough datum. When machining parts, ensure that the materials are sufficient, the machining surface has sufficient allowance, and the size and position of the machined surface of the part that is not machined shall meet the requirements of the machining drawing. If the coarse datum is selected, it is necessary to ensure that the surface of the part is convenient for positioning, clamping and processing, and the selected fixture is as simple as possible. When selecting the rough base, the machined surface and the non machined surface must be confirmed. There must be accurate location selection. Generally, the non machined surface is used as the rough base. When selecting the rough datum, the general purpose is to meet the requirement that the allowance after rough machining of important surfaces is small and average. When selecting the rough datum, the position error of the rough datum should be evenly distributed on the rough surface, and the rough datum should be as flat and intact as possible without gaps, which is conducive to setting the position. When selecting the precision base, follow the principle of selecting the precision base. First, check whether the precision base plane can be easily positioned and clamped for processing. If a certain surface is selected as the precision base, the positioning method of the selected surface can be used uniformly to improve the processing efficiency when selecting other surfaces. Therefore, be careful when positioning the precision surface. The precision datum adopts the principle of precise coincidence, even if the unified positioning principle is used to position and finish other surfaces. The principle for selecting the processing method of part appearance: For different part appearances, different part processing requirements, part construction characteristics, data properties, etc., the corresponding processing method shall be selected to process the part appearance. When confirming the part processing method, it is generally to confirm the final processing method of the part first, and then deduce and confirm the processing method of the previous process from the back to the front. (1) Principle of economic applicability When processing parts, first analyze the processing economy of the processing method, that is, analyze the selection of equipment, process, technicians, and processing time, that is, confirm the processing applicability, confirm the processing accuracy range, and the accuracy range should be compatible with the accuracy requirements and surface roughness requirements of the part surface processing, so as to ensure that the processed parts meet the requirements. (2) Principle of matching production type Different processing methods should be selected for different production types. High efficiency machine tools and advanced processing methods are often used for mass production, while the production methods of ordinary machine tools and conventional processing methods are generally used for parts produced in small batches. (3) Matching principle of processing method The processing method selected for mechanical processing of parts shall match with the shape accuracy and position accuracy of the machined surface, adapt to the part data, and adapt to the existing equipment conditions and workers' technical level. It is required to analyze the problems in detail, process according to the processing requirements and existing materials, and do not blindly match to cause processing failure.

The aluminum alloy extrusion process involves forcing the aluminum alloy through the die. Because demand has been increasing for many years, it is useful for product design and manufacturing. Products made by this process have many applications. The industries benefiting include automobile, aerospace, electronics and construction. The following is a process guide for the steps and types of finishes that can be achieved. What is the aluminum alloy extrusion process? Preparation of extrusion die First, we use H13 steel to process round moulds. Or, if we have a mold that fits your specifications, we can use it. This can even save the preparation time required to make one. Then, before extruding, we preheat the mold to about 450 to 500 degrees. This will help extend the service life of the mold and ensure a uniform flow of metal. After preheating, we load the extruder to start. Extrusion CNC processing: Preheating of aluminum billet The billet is a cylindrical solid aluminum alloy block. We cut it from a long section of alloy log. We preheat it to 400 to 500 degrees Celsius in the oven. This gives it sufficient ductility for extrusion. However, we did not reach the melting state to protect the equipment. Extrusion transfer to blank We mechanically transfer the preheated blanks to the extruder. This is after the use of release agents or lubricants. It prevents the plunger from sticking to the blank. Pressing to push the blank into the container Once loaded into the press, the hydraulic cylinders push the malleable billets. It does this by applying pressure of up to 15000 tons. This forces the material to expand and fit into the vessel wall. The appearance of material extruded by die When the container is filled, the material is pressed against the extrusion die. Continuous pressure forces the aluminum material through the mold opening. This is because it has no other escape route. Therefore, it will appear after fully forming the opening shape of the mold. Guide extrusion together with quenching jump table Aluminum alloy extrusion Once the aluminum extrusion comes out of the mold, a puller will grasp it and guide it along the runout table. However, the speed must match the exit speed of the press. The ratio depends on the profile difficulty, wall thickness, part weight and aluminum alloy selection. When the extrusion moves along the worktable, we use a water bath or a fan to uniformly quench it. Shear the extrusion at the table length We cut the extrusion after reaching the entire table length. The hot saw does this to separate it from the extrusion process. However, even after quenching, the extrusion is not cool enough for further processing. This requires an additional step. Cool extrusion at room temperature We transfer the cutting part to the cooling table. Here, the profile is cooled to room temperature. This will allow the extrusion to be stretched later. Move and Stretch Stretch Alignment The extrusion process sometimes causes the profile to twist naturally. This must be corrected because it may affect the functionality of the product. We use stretchers to complete the task. We mechanically grasp the ends of the profile and pull it until it is completely straight. We do this in order to meet the specifications. Move profile to complete sawing length This is the last step after realizing straight bench length extrusion. At Wemmitt, we saw a predetermined length. It is usually between 7 and 22 feet long. The extrusions at this stage are matched with T4 tempering. However, we can age them in the oven to reach the temperature of T5 or T6. Surface treatment of extruded aluminum products heat treatment This occurs after the extrusion is completed. We use it to enhance the properties of extrusion materials. The yield stress and tensile strength belong to these profiles. The oven accelerates the aging process to make the aluminum material reach T5 or T6 state. surface treatment This step is mainly to enhance the appearance and corrosion resistance of aluminum. Anodizing and other finishes will thicken the oxide layer of metal. It makes the metal more wear-resistant, improves the surface emissivity, and provides a porous surface, which is easier to accept dyes.

The process of CNC machining depends on the precision to a large extent. However, no CNC machine has absolute accuracy. Differences due to material factors or processing techniques used. Therefore, at Weimeite, we assign specific part tolerances to all CNC machining processes during the design process. Machining tolerance is the allowable deviation of part size. It is also called dimensional accuracy. It has minimum and maximum size limits. Any part size falling within these limits shall meet the tolerance requirements. Importance of CNC machining tolerance Most manufacturers refuse to start manufacturing parts until all features have well-defined tolerances. This is because it is the reference point for understanding how a part interacts with other parts. Lack of information limits our understanding of the final design. Therefore, the chance of obtaining inaccuracy is higher. For example, consider a shaft that fits the part design. The part has a hole of a specific diameter for the exact installation of the shaft in it. If the hole is smaller than the shaft size, it does not fit the shaft. The following are possibilities for providing or not providing tolerances. Provide tolerances. We will start the project immediately. This is because we know the required size limits. As a result, it shortens delivery times and minimizes costs. No tolerance provided. At Wilmet y, we decided to use standard tolerances. For example, ± 0.01mm for parts. Indicates that the diameter of the part will increase or decrease. If it reaches a tolerance lower than this limit, it needs to be CNC machined again. This only increases turnaround time and costs. Factors Affecting CNC Machining Tolerance Material Science Materials behave differently under stress. In addition, some materials are easier to use than others. Details of material properties shall be taken into account when determining tolerances. These characteristics affect the processing ability of materials. Here are some material properties: Thermal stability: non-metallic materials, such as plastics, will warp when heated. This limits the range of processing processes to be used because we have to take heat into account. Taking this into account will keep tolerances within acceptable limits. Abrasivity: It is difficult to process highly abrasive materials. Examples of such materials include phenolic resins and glass laminates. They can cause tool wear, which can lead to errors in machining. Stiffness and hardness: Flexible and soft materials can vary in size. This makes it more difficult to process them. Examples of such materials include: foam, polyisocyanurate and polyurethane Processing type CNC machining methods significantly affect the possible tolerances of finished parts. Some processes may be more accurate than others. Rail cutting: This process involves manual operation of the rail saw. Because of its manual characteristics, it requires a larger tolerance zone. This will result in better accuracy. Shear cutting: This process involves applying sufficient force to cause material failure. We often use a set of blades or punches and dies. Therefore, it is not applicable to brittle or soft materials. Because they are easy to warp and break under the action of great force. Therefore, it cannot maintain a tighter tolerance of less than ± 0.015 ". CNC screw processing: This process uses a disc cam to feed the workpiece. Since the part moves rather than the tool moves, there is less vibration and deflection of the part. This allows higher achievable accuracy. We recommend using it to process phenolic, foam, plastic parts and other materials. Steel rule die-cutting: This process uses custom die punches to create specific shapes. However, it does not apply to fragile or soft materials.

We provide 3-axis and 5-axis CNC machining. Optical parts are becoming more and more complex, so they need to be handled. The following is a new era of optical precision processing. There are several common methods for creating non complex optical components. It requires polishing and normal grinding procedures. However, we can only partially create complex optical components using these conventional methods. This is because they lack dimensional accuracy. In this case, our expert team chose to use multi axis machining. Micro and aspherical optical components usually require very strict tolerances. Fortunately, the precision cutting process provides the required precision. They use diamond tools on ultra precision tools to achieve this goal. Therefore, we finally obtained strict tolerance and high surface finish. We use this method to achieve the proper dimensional accuracy of optical parts and their molds. This is a further insight. What are the ultra precision production methods for optical components? There is an ideal method for manufacturing complex micro optical components. This is to achieve the first-class surface quality of a fraction of a micron Ra at the same time. It requires the use of ultra precision tools and diamond cutting machines. Obtaining freeform surfaces, complex geometry, and real 3D parts requires top level expertise. We sometimes have to use some unique multi axis machining methods. There are few methods used by machinists in optical precision machining. These include laser processing, EDM, grinding, micro cutting and silicon etching. Optical processing needs to be carried out on the optical surface of plane and free surface. Micro cutting is the only way to achieve the required structure size, accuracy and precision on both optical surfaces. What are the tool factors of optical precision machining? Two main factors determine the production quality of optical parts. These are the tool tip roundness and sharpness. Therefore, we must include special tool geometries. These include ball end mills, diamond micro end mills and other turning and forming tools. There are several ultra precision cutting methods for optical parts. They are flying cutter cutting, end mill cutting, cut in cutting and rapid tool cutting. Our expert team sometimes combines vibration free CNC machine tools with compact tool holders and fixtures. This allows a single point diamond cutting tool to effectively scrape material off the workpiece. This method ensures that very high and concentrated cutting forces are applied to the workpiece. As a result, we ended up with almost no dents elsewhere, while maintaining perfect shape accuracy and surface finish. This enables us to achieve optical precision machining. What is single point diamond tool turning? Optical precision machining When we want to obtain rotationally symmetric optical parts, we will apply this type of processing. It is one of the most effective cutting processes. This method achieves high cutting speed and high surface finish when Ra is less than 5. The tools we use in this method take into account the accuracy of parts in production. Our experts often calculate the tool radius and the compensation of the whole tool during the machining process. In addition, we must be very careful when dealing with precision in the submicron range. This involves controlling the waviness of the tool at 0.1 um of the tool radius. At the same time, if we need a simpler surface structure, we will use cut in cutting with pointed tools. These methods are helpful for us to realize optical precision machining. CNC milling CNC milling is a great choice for machining complex surface geometry. We sometimes use it to realize the surface treatment of free-form surfaces. Examples of optical components that we can manufacture include camera lenses and vehicle lighting prototypes. In processing these parts, we need at least a three-axis CNC machine tool. In contrast, we need a 5-axis machine to obtain accurate optical surface features. In this case, we used three main diamond CNC milling tools. They are end mills, flying cutter cutters and ball end mills. Ball end milling cutter is very important when dealing with freeform surface features. This is because they can handle geometry up to 0.5mm. Our professional processing services enable us to achieve internal angle accuracy up to R0.1-R0.15 mm. Flying cutting tool is the ideal choice for groove cutting. In addition, we can use them when working with planes. For example, we use it to process laser mirrors and pyramid parts. What is the key role of optical precision machining in the modern world? It is worth noting that the demand for optical components is at its peak. This is accompanied by a growing consumer market for electronic components. It is worth noting that camera lenses are used in digital SLR cameras, smartphones and printer scanning mirrors. This brings challenges to the market. The main problem is how to economically and efficiently produce free-form optical components. Fortunately, precision machining enables us to achieve this goal. We finally replaced the ordinary camera lens with a single free-form mirror part. This makes it compact and saves production costs.

Most manufacturers find themselves neglecting titanium alloys as raw materials. This is mainly due to its unique functions. The latest advances in technology and metallurgy enable us to look at titanium from another perspective. However, the use of titanium alloys will cause a series of problems. Fortunately, our team of experts in Vermeer is good at dealing with challenges. We provide good quality control for titanium alloy parts processed with high precision. The following guidelines will describe how we can achieve high-speed titanium processing. Titanium alloys provide a better weight to strength ratio than steel under ideal conditions. It also has strong corrosion resistance and is well matched with human tissues. In addition, it provides excellent performance even at very high temperatures. Its light weight and strength make it an ideal choice in the aerospace field. What are the most common types of titanium alloys? Due to the addition of elements, titanium alloys appear in different forms. These elements help to improve the function of titanium alloy parts. Titanium may change at temperatures above 800 degrees. Some elements will lower the temperature of the titanium used. We call them beta stabilizers. Some elements raise the temperature of the titanium used. We call these alpha stabilizers. We divided titanium alloys into four groups. This depends on the type of stabilizer present. Understanding the alloy variants you are working on is the key to cnc machining of high-speed titanium alloys. These groups are: Unalloyed titanium This refers only to the basic form of titanium. This unalloyed titanium form provides the best corrosion resistance. However, compared with other variants, its strength is lower. Alpha titanium alloy This type of titanium provides better creep resistance. Therefore, we use it for high temperature performance. α-β alloy This is the most diverse group because it provides great functionality. Existing α The components increase heat resistance, while β The components increase the strength. This mixture sometimes accounts for about 50% of the total titanium alloy market. β alloy It is the alloy group with the highest hardness at present. It is also denser than the previous alloy group. What are the reasons that limit high-speed titanium cnc machining? There are many reasons why titanium is difficult to machine. We will introduce them without further studying the mechanical principles of titanium grinding, milling or turning. The following are the key points for titanium to perform tasks on the machine. High speed titanium alloy processing First, titanium can maintain its great strength even at high temperatures. In addition, it can maintain resistance to plastic deformation even at high cutting speeds. Therefore, we finally used a larger cutting force different from that of steel. This will eventually damage high-speed titanium processing. Secondly, its chips are very thin after forming. Therefore, the contact area between the tool and the chip is ultimately 3 times smaller than that of steel. Therefore, the tip of the tool eventually bears most of the cutting force. Third, titanium alloys usually have higher friction coefficients than most cutting tools. We finally had to increase the cutting force and temperature. Therefore, this limits high-speed titanium processing. Fourth, titanium sometimes reacts with tool materials at temperatures above 500 degrees. It also tends to self ignite when cutting after high temperatures have accumulated. Therefore, we will eventually use coolant when cutting titanium alloy. The time taken by this process will interfere with high-speed titanium processing. Fifth, most of the heat generated in the cutting process enters the cutting process. This is due to the very thin chip and low contact area. This will eventually reduce its life. We eventually use high pressure coolant to prevent heat build-up.

Medical components are essential for countries with an ageing population. In addition, the growth of the industry is affected by rising health costs and technological progress. Importance of medical parts Medical components are mainly helpful to improve surgical results. These have had a real impact on people's lives. The market for the medical sector has been rising. More and more customers seek our help in medical parts processing, and we will not let them down. As the market grows, we strive to improve product features, our business model and customer service. However, there are some problems when keeping up with the latest technology while reducing costs. Understand cnc processing medical precision parts Medical machining is both a definition and a work. It needs to process medical parts with ultra-high precision. We use numerical control machine tools to achieve this goal. They enable us to process highly complex medical parts. These are essential for the production of medical devices. The first can easily handle conventional processes such as turning, boring, drilling, boring, milling and knurling. Then, we can carry out deep hole drilling, broaching, threading and other special processes. They don't need to set it up many times to achieve this goal. Using cnc machine tools, we can cnc machining micro screws and precision surgical parts. Medical parts often require strict tolerances and are often complex. We sometimes face the pressure of machining smaller parts. Therefore, this means that we must keep up with the latest developments in micro machining. Multi tool and multi axis machine tools enable us to improve cnc machining of medical parts. They shorten cycle time because we can process all features on one machine. Medical parts Medical units have highly complex machined parts. Its complex components are essential for the safe implementation of the device. Designing and processing them requires first-class creativity. Fortunately, we are good at processing high-quality medical precision parts. Examples of medical components are clamps, screws, locking plates, and surgical needles. Before each project, we first consult our component suppliers. This allows us to determine tolerances that are more stringent than normal. Then, we continue to work on the design process to save time and effort. Tolerance requirements for medical parts We have multi spindle and CNC lathes for our use. This allows us to machine medical parts with a tolerance of more or less 0.01 mm. In addition, our customers can choose a range of surface treatments. The surface treatment thickness of the machine can reach 8 microns. In addition, we can use our professional programming and Y-axis machining to produce complex geometric shapes. These functions are very suitable for customers with strict size and finishing requirements. Regardless of the complexity, our professional level is competent for this task. What makes us a capable cnc workshop for medical parts? Cnc machining of medical parts needs high precision and reliability. Therefore, it needs to be processed by a professional medical cnc workshop. Our experts can easily undertake the task. They first try to provide the highest possible consistency and accuracy. This is to work in a strictly controlled and safe environment. Whether large or small batches, we intend to maintain appropriate repeatability. Fortunately, we easily achieved this goal with an optimized short cycle process. In addition, they enable us to reduce the waste of cnc processing medical parts. In addition, we have preventive maintenance and strict tool planning to avoid any delay. We further use online production to reduce costs and maintain quality. This enables us to produce any number of medical components quickly and cheaply. We also provide high-quality CNC cutting tools. They can handle a range of special materials that occur when handling medical parts. Examples of these materials are nickel, titanium, cobalt chromium alloys and stainless steel. Use Swiss turning milling compound CNC to process and produce medical parts The complexity and delicacy of medical parts determine professional CNC coding and engineering. This ensures the highest accuracy to meet the standards set by the customer. A Swiss CNC machine tool processes the bushing. This ensures that the cutting tool is never too far from the workpiece. You may wonder why this is important. It reduces any errors caused by distance deflection. This is critical when handling slender medical components. In addition, it can help us deal with small, fine parts. Its speed and efficiency allow for fast and flexible responses. This ensures repeatability regardless of volume. As a prototyping method, CNC machining can speed up the whole process. We further combine it with precision grinding to enable us to respond to customer needs.

Along with the transformation and upgrading of China's economic structure, the investment in high-tech research and development has gradually increased, followed by the emergence of a large number of plants and laboratories containing precision instruments or equipment. However, the vibration caused by urban construction and urban traffic has an unavoidable impact on the building facilities and precision instruments, causing widespread concern in the construction industry. Vibration reduction and isolation technology is currently the main effective means of vibration protection for precision instruments and equipment. The concept of ultra-precision machining technology was really put forward systematically in China from the 1980s to the early 1990s. As the development of military industries such as aviation and aerospace put forward higher requirements on the machining accuracy and surface quality of components, these military industries invested funds to support the research institutes and universities in the industry to start the basic research on ultra-precision machining technology. As the ultra-precision machining technology belonged to military technology at that time, foreign countries implemented technology embargo in terms of equipment or process, so the development of domestic ultra-precision machining technology basically started from the research of ultra-precision machining equipment. Ultra-precision machining technology also plays a big role, artificial joints using titanium alloy or other precious metal materials, the surface treatment of these high-precision parts have extremely high requirements for cleanliness, finish and surface roughness, the need for ultra-precision grinding and polishing, the shape should be customized according to the individual body structure, expensive abroad, while there is a large gap in terms of service life and safety in China.

CNC precision parts processing in the industry is still relatively wide, why would say so, in fact, we can see in life, the role of obvious, in some mechanical equipment above the application will also be more, to know the CNC precision parts processing precision machining requirements are also high, why, because the customer in the demand for quality, and this CNC precision parts processing itself, the advantages of large, so we need to do better, more customer trust, this is what CNC precision parts processing needs to do. So we have to do better, more customer trust, which is what CNC precision parts processing needs to do. CNC lathe milling plane class parts of the feed path Milling planar parts outside the general, usually choose the side edge of the end mill for cutting. In order to reduce the traces of the cutter, to ensure the quality of the appearance of the parts, the cutter cut-in and cut-out procedures need to be carefully designed. When milling the outer surface, the entry and exit points of the milling cutter should be along the extension line of the general curve of the part to cut into and out of the exterior of the part, and should not be cut directly into the part along the normal direction, in order to avoid scratches on the machined surface and to ensure the general lubrication of the part. Milling off the internal general appearance, if the internal general curve promises to extend, it should be cut into and cut out along the tangent direction. If the internal general curve does not allow the extension, the tool can only cut in and out along the normal direction of the internal general curve, and will be cut, cut out point selected in the intersection of the two elements of the part general. When the internal elements are tangent to each other without intersection, in order to avoid the notch left at the corner of the generalization when the tool is withdrawn, the tool entry and exit points should be far from the corner. Shown is the tool path when milling the outer full circle by circular interpolation method. When the whole circle processing is finished, do not 2 back at the cutting point, but should let the tool move along the tangent direction for a distance, to avoid the withdrawal of the tool complement, CNC lathe tool and workpiece appearance touch, constitute the workpiece waste. When milling the inner arc, we should also follow the guideline of cutting from the tangential direction, and best organize the processing road from the arc transition to the arc, which can improve the processing accuracy and processing quality of the inner hole appearance.

How to achieve 0.8 surface roughness of aluminum alloy for cnc machining? Use a larger diameter milling cutter disc, rotating speed as high as possible, but the machine can not vibrate, rough milling to leave 0.3-0.5mm margin and then finish machining, can not be achieved depending on the milling cutter line speed enough, the blade sharp or not. To a larger diameter milling cutter disc is to easily reach high linear speed, light to increase the speed does not increase the diameter of the milling cutter disc effect is not good. Doing so is generally able to achieve 0.8 roughness in addition, the fine milling time to add sufficient cutting fluid.   What is the general CNC processing surface roughness? General ordinary machine tools are processed out of about 3.2, high-speed machines can reach 1.6 finish; note that it depends on the tool and cutting parameters used in the processing. The smaller the value of the surface roughness of the part, the finer it is?   1, about the contour meter and roughness meter Contour meter and roughness meter is not the same product, the main function of the contour meter is to measure the contour shape of the surface of the parts.   For example: the groove depth, groove width, chamfer (including chamfer position, chamfer size, angle, etc.) of the grooves in the automotive parts, the straightness of the cylindrical surface plain line and other parameters. In short, the contour meter reflects the macro profile of the part.   2, the function of the roughness meter is to measure the surface of the parts surface grinding / finishing process surface processing quality, in layman's terms, is the parts surface processing light or not (roughness of the old national standard called finish), that is, roughness reflects the microscopic situation of the parts processing surface.

For CNC computer gong machining center positioning datum selection, how do the relatives choose it? Because CNC computer gong machining center positioning in the machinery industry is also a lot of user knowledge is weak in terms of, then CNC computer gong machining center positioning benchmark selection what are they?CNC computer gong machining center positioning benchmark what are the points? I. Three basic requirements for choosing a benchmark. ①. The selected benchmark should be able to ensure accurate positioning of the workpiece easy and reliable loading and unloading. ②. The selected benchmark and the size of each processing part is simple to calculate. ③. Ensure machining accuracy. Second, the best clamping position of the workpiece on the machine table: workpiece clamping position should ensure that the workpiece in the machine tool within the range of the machining stroke of each axis, and make the length of the tool as short as possible to improve the rigidity of the tool processing.   Third, the selection of positioning benchmark 6 principles. ①, try to choose the design reference as the positioning reference. ②, positioning datum and design datum can not be unified, should strictly control the positioning error to ensure processing accuracy. ③, the workpiece needs more than two clamping processing, the selected benchmark in a clamping positioning can complete all the key precision parts of the processing. ④, the selected benchmark to ensure the completion of as much processing content. ⑤, batch processing, part positioning benchmark should be as far as possible with the establishment of the workpiece coordinate system of the tooling benchmark overlap. ⑥, need for multiple clamping, the benchmark should be unified before and after.