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

The division of the machining process of precision parts is carried out with reference to the machined parts and the designed machining process. In the processing of precision parts on CNC machine tools, the processes can be relatively concentrated, and most or all of the processes can be completed in one clamping. First, according to the part drawing, consider whether the processed part can complete the processing of the whole part on one CNC machine tool. If not, decide which part is processed on the CNC machine tool and which part is processed on other machine tools, that is, divide the processing procedures of the parts. The division of processes and steps shall be comprehensively considered according to the structural characteristics and technical requirements of specific parts. General process division method: Division of work steps the division of work steps is mainly considered from two aspects of machining accuracy and efficiency. In a precision part processing process, it is often necessary to use different tools and cutting parameters to process different surfaces. In order to facilitate the analysis and description of more complex processes, the process is subdivided into work steps. Principle of work step division: 1. Rough machining, semi finish machining and finish machining shall be performed on the same surface in sequence, or all machined surfaces shall be processed separately according to rough machining and finish machining. 2. For parts with both milling surface and boring hole, milling surface and boring hole can be conducted first. The accuracy of the hole can be improved by dividing the work steps according to this method. Because the cutting force is large during milling, the workpiece is prone to deformation. Milling the surface first and then boring the hole, so that it can recover for a period of time to reduce the impact on the accuracy of the hole caused by deformation. 3. Divide work steps according to tools. The turning time of the worktable of the precision parts processing machine tool is shorter than the tool changing time. The work steps can be divided according to the tool to reduce the number of tool changing and improve the processing efficiency.

The machining method of the surface of CNC workpiece depends on the technical requirements of the machined surface. However, it should be noted that these technical requirements are not necessarily the requirements specified in the part drawing, and sometimes they may be higher than the requirements on the part drawing due to process reasons. For example, the machining requirements for the surface of some CNC machined parts are increased due to the non coincidence of the datum. Or higher processing requirements may be put forward due to being used as a precision reference. After the technical requirements of the surface of each CNC machining part are defined, the final machining method that can meet the requirements can be selected accordingly, and the machining methods of several steps and each step can be determined. The selected CNC machining method should meet the requirements of part quality, good machining economy and high production efficiency. Therefore, the following factors should be considered when selecting the processing method: 1. The machining accuracy and surface roughness that can be obtained by any CNC machining method have a considerable range, but only in a narrow range can it be economical. The machining accuracy in this range is the economic machining accuracy. Therefore, when selecting the processing method, the corresponding processing method that can obtain economic processing accuracy should be selected. 2. The properties of CNC workpiece materials shall be considered. 3. The structural shape and size of CNC machining parts shall be considered. 4. Productivity and economic requirements shall be considered. High efficiency advanced technology shall be adopted for mass production. It can even fundamentally change the manufacturing method of the blank and reduce the labor amount of machining. 5. Consider the existing equipment and technical conditions of the factory or workshop When selecting the processing method, we should make full use of the existing equipment, tap the potential of the enterprise, and give play to the enthusiasm and creativity of the workers. However, continuous improvement of existing processing methods and equipment, adoption of new technologies and improvement of process level shall also be considered.  

1.Before processing each procedure, it is required to strictly confirm whether the applied tool is consistent with the procedure. 2. Confirm whether the length of the tool and the selected clamping tool head are suitable when installing the tool. 3. It is forbidden to start the door during the operation of the machine tool to avoid flying knives or workpieces. 4. In case of tool collision during processing, the operator must stop the machine immediately, such as pressing the "emergency stop" button or the "reset key" button or adjusting the "feed rate" to zero. 5. In the same workpiece, the tool should be kept in the same area every time to ensure the accuracy of the tool when it is connected with the CNC machining center. 6. If excessive machining allowance is found during machining, it is necessary to use "single segment" or "pause" to reset the X, y and Z values, then manually mill them off and then shake them back to "zero" to allow them to run on their own. 7. Operators shall not leave the machine tool or regularly check the operation status of the machine tool during self operation. If they need to leave midway, they must designate relevant personnel to check. 8. Clean the aluminum slag in the machine tool to prevent the aluminum slag from absorbing oil before the light knife is sprayed. 9. Try to blow with air in the roughing procedure, and inject oil in the light knife procedure. 10. The workpiece shall be cleaned and deburred in time after being off the machine. 11. When off duty, operators must make timely and accurate handover to ensure that subsequent processing can be carried out normally. 12. Before shutdown, ensure that the tool magazine is at the original position and the XYZ axis is at the center position. Turn off the power supply on the machine tool operation panel and the main power supply in turn. 13. In case of thunderstorm, the power supply must be cut off immediately to stop working. In addition to the above points, there are a lot of things that need our attention from time to time. The system should pay attention to, and the machine should also pay attention to maintenance. In fact, most of the time, the machine will break down, which is largely due to the improper operation of the user. The machine will be maintained irregularly, and the machine will not be inspected and preheated before startup. Due to the bad environment, some companies keep the machine in dark and humid for a long time, and the dust is everywhere, The corrosion of oil and other chemical liquids, as well as the unauthorized movement of the machine by the production personnel, can easily lead to problems of the machine. In fact, if these problems are handled in a timely manner, the service life of our machine will definitely be much longer, the processing accuracy and performance of the machine will be as new as new, the loss will be greatly reduced, and the replacement frequency of parts and components will be reduced, saving a lot of time and cost

1、 CNC machining center or engraving and milling machine? CNC machining center and engraving and milling machine are commonly used mechanical equipment. They also have similarities and differences. If we insist that CNC machining center is better or engraving and milling machine is better, it is difficult to have an accurate answer. There is no way to compare different uses. We can only compare the advantages and disadvantages of the two in some small aspects. 2、 Is rigidity better than CNC machining center or engraving and milling machine The rigidity of the non moving part of the CNC machining center is very good, and the rigidity of the moving part is also very good, which can be used for heavy cutting. The non moving part of the engraving and milling machine has good rigidity, and the moving part is less rigid than the CNC machining center due to the flexible requirements of the engraving and milling machine. 3、 Is the spindle speed faster for CNC machining centers or for engraving and milling machines The spindle speed of CNC machining center is generally 0-8000rpm. Although the high-speed machining center can reach a high speed, on the whole, the carving and milling machine requires a high speed CNC system. The spindle speed is generally 3000-30000rpm. The spindle speed of some special carving and milling machines is higher than that of the high-speed machining center. 4、 The machining range of CNC machining center and engraving and milling machine is different CNC machining center is used to complete the equipment processing of workpieces with large milling volume, and can perform heavy cutting. The engraving and milling machine is generally used for processing equipment with small cutting amount or soft metal, and is commonly used for lettering. Generally speaking, if we insist on comparison, we can't distinguish between high and low. For example, we can't use engraving and milling machines in heavy cutting, and the machining center is useless in fine lettering. We can only say that both of them have their own characteristics and fields of action, so we can't make a strong comparison.

Aluminum precision parts and products are popular for their light weight and beautiful appearance, and are widely used in industry and daily necessities. With the continuous progress of science and technology, people's demand for product diversity is increasingly strong. Therefore, the process requirements of aluminum alloy products are higher and higher, and the market demand is also higher and higher. In order to meet people's demand for the diversity and high quality of aluminum alloy shell products, aluminum alloy CNC processing manufacturers summarized the process skills and the problems needing attention in aluminum CNC processing.       1. Select appropriate processing method Numerical control cutting is a kind of streamline cutting processing method, and is also a common process of aluminum precision processing. I am using an end mill with multi-directional cutting capability, spiral cutting interpolation and contour cutting interpolation. Process fewer holes with fewer tools.       2. Ball end milling cutter can cooperate with spiral interpolation to continuously process taper holes Ball end mills and screw interpolation drills can be used for boring and chamfering. The end milling cutter can cooperate with contour cutting interpolation for semi finishing of holes and machining of precision parts. The end milling cutter used for thread processing can be used with screw interpolation to process various threaded holes. Tool interpolation can be used to process high-efficiency aluminum alloy precision parts in precision holes of various sizes. The load on each tooth is relatively light, especially when using a high-speed milling machine. Therefore, the same coated cemented carbide end mills can be used for high-speed and high-precision drilling of a variety of processing materials.     3. Select appropriate cutting amount Workers can choose which cutting speed to use according to the material being processed, hardness, cutting conditions, material type and cutting depth. These conditions are necessary to effectively reduce machine wear.     4. Select appropriate tools Rake angle: the rake angle shall be properly selected while maintaining the edge strength. One side can grind sharp cutting edge to reduce cutting deformation, make chip removal more smooth, and reduce cutting resistance and cutting heat. Do not use tools with negative rake angles. Back corner: the size of the back corner directly affects the wear of the back corner surface and the quality of the machined surface. The cutting thickness is an important standard for selecting the relief angle. During rough machining, the feed rate is large, the cutting load is large, and the heat generation is large. Therefore, the tool is required to have good heat dissipation conditions. Therefore, a smaller rear angle should be selected. When the milling machine is finishing, the edge grinding is required to reduce the friction between the flank and the machining surface and reduce the elastic deformation. Therefore, a larger rear angle should be selected. Helix angle: the helix angle should be as large as possible to make the milling machine smooth and reduce the force on the milling machine. Approach angle: properly reducing the approach angle can effectively improve the heat dissipation conditions and reduce the average temperature of the treatment area. Reduce the number of milling teeth and increase the chip removal space. Due to the large plasticity of the aluminum alloy material, the cutting deformation is large during processing, the chip space is large, the radius of the bottom of the chip holding groove is large, and the number of teeth of the milling cutter is small. for example φ The milling cutter below 20mm uses 2 teeth, but φ 30~ φ It is preferable to use 3 teeth for a 60mm milling cutter to prevent deformation of thin aluminum alloy parts due to chip blockage. Fine grinding: the roughness value of tooth edge shall be less than RA = 0.4um. Before using a new knife, the front and back of it should be gently polished with a fine oil stone to remove any burrs or slight serrations left by the grinding. In this way, not only the cutting heat can be reduced, but also the cutting deformation is relatively small. Strictly control the tool wear standard. With the tool wear, the workpiece surface roughness increases, the cutting temperature increases, and the workpiece deformation increases. Therefore, the wear standard shall not exceed 0.2mm except for the tool materials with good wear resistance. Otherwise, it is easy to produce accumulated debris tumor. During cutting, the temperature of the workpiece shall not exceed 100 ℃ to prevent deformation. 5. Select a reasonable fixture Parts must fully meet the needs of the machine to reduce unnecessary positioning errors, and special clamping tools shall be selected. 6. Determine reasonable processing route     Try to keep the processing route as short as possible to reduce machine wear. In high-speed cutting, the machining allowance is large and the cutting is intermittent, so the milling machine will produce vibration during machining, affecting the machining accuracy and surface roughness. Therefore, CNC high-speed machining can generally be divided into rough machining semi finishing, corner cleaning, finishing and other processes. For parts requiring high accuracy, it may be necessary to perform secondary semi finishing before finishing. After rough machining, the parts are naturally cooled to eliminate the internal stress generated by rough machining and reduce deformation. The allowance left after rough machining shall be greater than the deformation (generally 1-2mm). In the process of finishing, the finished surface of parts shall maintain uniform machining tolerance. 0.2-0.5 mm is generally good. This keeps the tool stable during machining and significantly reduces cutting deformation. Obtain good surface processing quality and ensure product accuracy.

Aluminum precision parts and products are popular for their light weight and beautiful appearance, and are widely used in industry and daily necessities. With the continuous progress of science and technology, people's demand for product diversity is increasingly strong. Therefore, the process requirements of aluminum alloy products are higher and higher, and the market demand is also higher and higher. In order to meet people's demand for the diversity and high quality of aluminum alloy shell products, aluminum alloy CNC processing manufacturers summarized the process skills and the problems needing attention in aluminum CNC processing.         1. Select appropriate processing method Numerical control cutting is a kind of streamline cutting processing method, and is also a common process of aluminum precision processing. I am using an end mill with multi-directional cutting capability, spiral cutting interpolation and contour cutting interpolation. Process fewer holes with fewer tools.             2. Ball end milling cutter can cooperate with spiral interpolation to continuously process taper holes Ball end mills and screw interpolation drills can be used for boring and chamfering. The end milling cutter can cooperate with contour cutting interpolation for semi finishing of holes and machining of precision parts. The end milling cutter used for thread processing can be used with screw interpolation to process various threaded holes. Tool interpolation can be used to process high-efficiency aluminum alloy precision parts in precision holes of various sizes. The load on each tooth is relatively light, especially when using a high-speed milling machine. Therefore, the same coated cemented carbide end mills can be used for high-speed and high-precision drilling of a variety of processing materials.                 3. Select appropriate cutting amount Workers can choose which cutting speed to use according to the material being processed, hardness, cutting conditions, material type and cutting depth. These conditions are necessary to effectively reduce machine wear.           4. Select appropriate tools Rake angle: the rake angle shall be properly selected while maintaining the edge strength. One side can grind sharp cutting edge to reduce cutting deformation, make chip removal more smooth, and reduce cutting resistance and cutting heat. Do not use tools with negative rake angles. Back corner: the size of the back corner directly affects the wear of the back corner surface and the quality of the machined surface. The cutting thickness is an important standard for selecting the relief angle. During rough machining, the feed rate is large, the cutting load is large, and the heat generation is large. Therefore, the tool is required to have good heat dissipation conditions. Therefore, a smaller rear angle should be selected. When the milling machine is finishing, the edge grinding is required to reduce the friction between the flank and the machining surface and reduce the elastic deformation. Therefore, a larger rear angle should be selected. Helix angle: the helix angle should be as large as possible to make the milling machine smooth and reduce the force on the milling machine. Approach angle: properly reducing the approach angle can effectively improve the heat dissipation conditions and reduce the average temperature of the treatment area. Reduce the number of milling teeth and increase the chip removal space. Due to the large plasticity of the aluminum alloy material, the cutting deformation is large during processing, the chip space is large, the radius of the bottom of the chip holding groove is large, and the number of teeth of the milling cutter is small. for example φ The milling cutter below 20mm uses 2 teeth, but φ 30~ φ It is preferable to use 3 teeth for a 60mm milling cutter to prevent deformation of thin aluminum alloy parts due to chip blockage. Fine grinding: the roughness value of tooth edge shall be less than RA = 0.4um. Before using a new knife, the front and back of it should be gently polished with a fine oil stone to remove any burrs or slight serrations left by the grinding. In this way, not only the cutting heat can be reduced, but also the cutting deformation is relatively small. Strictly control the tool wear standard. With the tool wear, the workpiece surface roughness increases, the cutting temperature increases, and the workpiece deformation increases. Therefore, the wear standard shall not exceed 0.2mm except for the tool materials with good wear resistance. Otherwise, it is easy to produce accumulated debris tumor. During cutting, the temperature of the workpiece shall not exceed 100 ℃ to prevent deformation.                 5. Select a reasonable fixture Parts must fully meet the needs of the machine to reduce unnecessary positioning errors, and special clamping tools shall be selected.             6. Determine reasonable processing route Try to keep the processing route as short as possible to reduce machine wear. In high-speed cutting, the machining allowance is large and the cutting is intermittent, so the milling machine will produce vibration during machining, affecting the machining accuracy and surface roughness. Therefore, CNC high-speed machining can generally be divided into rough machining semi finishing, corner cleaning, finishing and other processes. For parts requiring high accuracy, it may be necessary to perform secondary semi finishing before finishing. After rough machining, the parts are naturally cooled to eliminate the internal stress generated by rough machining and reduce deformation. The allowance left after rough machining shall be greater than the deformation (generally 1-2mm). In the process of finishing, the finished surface of parts shall maintain uniform machining tolerance. 0.2-0.5 mm is generally good. This keeps the tool stable during machining and significantly reduces cutting deformation. Obtain good surface processing quality and ensure product accuracy.

At present, the automotive industry has been the vertical industry with the most 3D printing applications, and from the perspective of the trend, the application of 3D printing in the automotive field will usher in more favorable development conditions. First of all, there is the issue of industrial chain. Under the trend of global economy and the influence of capital chasing profits, the industrial chain of the automobile industry is spread across many countries in the world. However, under the influence of the epidemic, some parts of the automobile industry have encountered shortages and increased transportation time.       The United States, Germany, Japan and other old automobile powers are facing the situation of industrial chain fracture. Except for some high-precision parts produced by their own enterprises, many other parts need to be purchased from other countries. Moreover, due to the influence of labor cost and production cost (a certain amount is required to share the cost), they are also able to re-establish their own supply chain. Therefore, they are currently focusing on 3D printing technology, hoping to produce some parts through 3D printing technology. The rapid development of electric vehicles is also conducive to the application of 3D printing technology in the automotive industry. It is estimated that by 2035, more than half of the newly sold vehicles will be electric vehicles, and in some countries, the proportion may reach 80%. In order to seize the market, there may be more than 400 electric vehicles in the next 8 years. This makes the development cycle very tight, and 3D printing has the advantage of rapidly manufacturing various prototypes in the development stage.         In addition, 3D printed parts can be fully topology optimized, or directly adopt parametric generative design, which can produce parts with better performance and lighter weight. It can also combine multiple parts into an integrated part, reducing the installation steps. Especially for electric vehicles, in order to increase the range, lightweight becomes more important. Therefore, for some parts, 3D printing may be more costly than parts manufactured by traditional processes, but the overall cost is lower if the later use cost is considered. In practical applications, engineers also make up for the advantages of 3D printing through clever design. Due to the molding technology, the surface of 3D printed articles will have laminations, which will affect the aesthetics. However, by designing various surface shapes, it can make up for this shortcoming and enrich the selectivity. For example, most of the current car interiors are made of leather. And 3D printing can realize various textures. Therefore, in general, 3D printing will have a good development prospect in the automotive industry.

You may have heard of machine tools more or less. In fact, it is closely related to our daily life, because many parts of commonly used items such as mobile phones and cars are produced by machine tools. Let's learn about the common types of machine tools and their characteristics.           01. Drilling machine Drilling machine is a machine tool that is good at drilling holes in metal and other materials. Place the material on the base and fix it. Rotate the drill to scrape. Since the material is fixed, the deviation can be well suppressed and accurate drilling can be realized. advantage: Fast drilling speed; The borehole diameter is accurate. Main types: Vertical drilling machine, radial drilling machine and bench drilling machine.               02. Boring machine A machine tool for machining the inner diameter of an existing hole or other circular profile. It is generally used to enlarge the hole diameter or deepen the hole. advantage: Large and deep holes can be drilled; You can create large structures. Main types: Horizontal boring machine, vertical boring machine, CNC boring machine.                 03. Lathe A machine tool that fixes materials on the spindle, rotates at high speed, and then uses tools to process parts. It is suitable for machining cylindrical parts and is a widely used machine tool at present. advantage: Good at cylindrical shape processing Support the processing of various materials. Main types General purpose lathe, CNC lathe.             04. Milling machine A machine tool that is the exact opposite of a lathe. The material is fixed on the workbench, and the material is cut and processed by rotating tools. advantage: Suitable for making square parts; Able to process some complex structures; The cost of processing the product is low. Main types: Vertical milling machine, horizontal milling machine, gantry milling machine.             05. Machining center It can be simply understood that a milling machine equipped with an automatic tool change system (ATC) can automatically change tools and realize a variety of processing. advantage: Suitable for mass production High precision machining Main types: Vertical machining center Horizontal machining center Gantry machining center

As a low-carbon series of 316 steel, 316L stainless steel has the same characteristics as 316 steel and excellent grain boundary corrosion resistance. It is an austenitic stainless steel. Due to the addition of Mo element, its corrosion resistance and high-temperature strength have been greatly improved. The high-temperature resistance can reach 1200-1300 degrees and can be used under harsh conditions. Processing technology: SLM laser metal powder melting       01 Material properties 1. Corrosion resistance. It has good corrosion resistance in the production of pulp and paper. Moreover, 316L stainless steel is also resistant to the corrosion of the ocean and aggressive industrial atmosphere. 2. Heat resistance. 316L stainless steel has good oxidation resistance in intermittent use below 1600 degrees and continuous use below 1700 degrees. The stainless steel has good heat resistance in the range of 800-1575 degrees. The carbide precipitation resistance of 316L stainless steel is better than that of 316 stainless steel. The characteristics of 316L steel are as follows: 1) Cold rolled products have good gloss and beautiful appearance; 2) Due to the addition of Mo, the corrosion resistance, especially the pitting resistance, is excellent; 3) Excellent high temperature strength; 4) Excellent work hardening (weak magnetism after processing); 5) No magnetism in solid solution state; 6) Compared with 304 stainless steel, the price is higher. 316L is a kind of molybdenum containing stainless steel, and its performance is better than 310 and 304 stainless steel, so it is recognized by the market.   02 Application scenario It is commonly used for heat exchanger of pulp and paper equipment, dyeing equipment, film processing equipment, pipeline, materials for external use of buildings in coastal areas, and watch chain and case of high-class watches. Marine engineering equipment, chemical, dye, papermaking, oxalic acid, fertilizer and other production equipment; Photography, food industry, coastal facilities, ropes, etc.

When it comes to CNC processing, time is money. For small batch production, part setup, programming, and machine run times often far exceed material costs. Understanding how the part geometry determines the required machine tool is an important part of minimizing the number of settings that the mechanic needs to perform and the time it takes to cut the part. This can speed up the part manufacturing process and save you money. Here are three tips you need to know about CNC machining and tools to ensure that you can design parts effectively. 1. Create wide corner radius The end mill will automatically leave the inner corner of the circle. A larger corner radius means that larger tools can be used to cut corners, thereby reducing running time and thus costs. In contrast, a narrow internal corner radius requires both a small tool to process the material and more tool paths - usually at a slower speed to reduce the risk of deflection and tool breakage. In order to optimize the design, always use the corner radius as large as possible and take 1 / 16 "radius as the lower limit. Corner radii smaller than this value require very small tools, and the running time increases exponentially. In addition, if possible, try to keep the inner corner radius the same. This helps eliminate tool changes, which increase complexity and significantly increase runtime. 2. Avoid deep pockets Parts with deep cavities are often time consuming and costly to manufacture. The reason is that these designs require fragile tools, which are easily broken during machining. In order to avoid this situation, the end milling cutter should be "decelerated" step by step in uniform increments. For example, if you have a 1 ″ deep groove, you can repeat the 1 / 8 ″ pin cutting depth, and then perform the finishing cutting with the last cutting depth of 0.010 ″. 3. Use standard drill and tap sizes Using standard tap and bit sizes will help reduce time and save part costs. When drilling, keep the dimensions as standard scores or letters. If you are not familiar with the dimensions of drill bits and end mills, it is safe to assume that the traditional fraction of one inch (such as 1 / 8 ", 1 / 4" or millimeter integer) is "standard". Avoid using measurements such as 0.492 "or 3.841 mm. For taps, 4-40 taps are more common and generally more available than 3-48 taps.