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

The milling machine completes the forming of metal by rotating the cutter and moving it along the axis on the workpiece. It is obvious that the position of the milling machine in machining is very important. Although milling machines are primarily used to machine flat and square surfaces, they are also used for many other purposes. Skilled technicians can use milling machines to cut viewpoints, fillets, and boreholes, and can use some subordinate equipment of milling machines to process arcs, semicircles, and helicoids (using spiral tools - double spiral or multiple spiral tools). Using some special tools on the milling machine can also process gear teeth, dovetail grooves and T-shaped grooves. More importantly, when machining the above workpiece shape on the milling machine, it can be completely manually operated, without the use of computer numerical control! Now, if we use computer control to drive the spindle of the milling machine, the scale of workpieces that can be processed will be larger. Using the computer aided design/computer aided production generation program to control the milling machine, it is almost possible to process workpieces of any shape. As long as the workpiece shape can be displayed on the computer screen, it can be basically milled. Milling operation. The basic operations in 12 can be divided into four types: (1) Face milling - cutting the plane with the tail of the cutter teeth. (2) Profiling cutting - machining the profile of the workpiece with the side face of the cutter. (3) Drilling. (4) Boring - forming an internal circular surface. 1. End milling The cutter is located below the surface of the workpiece at the required cutting depth, and then the workpiece is engaged with the cutter in a specific radial direction, which is called radial engagement. Radial engagement is expressed as the ratio between the length of the tool and the workpiece in the radial direction and its diameter. Face milling can be processed with three different milling cutters: Face milling cutter: This kind of tool is specially made, and the primary materials are high-speed steel and hard alloy. The insert type cemented carbide cutter is commonly used in industry up to now. The face milling cutter can achieve 64 medium high fine grinding, which may achieve more desired accuracy. End milling cutter: Because their end faces and circumference have teeth, this kind of cutter is used to cut the end faces. When the end teeth are used for grinding, the end milling cutter cuts straight into the workpiece. Similar to drilling, the face milling cutter cannot drill, so when it does not touch the workpiece, it is necessary to fix the DOC. End milling cutters with 2 or 4 teeth are very common, while end milling cutters with 3 teeth often use some high-speed cutting metals, such as aluminum. A few end milling cutters are made of cobalt high speed steel, which has higher hardness and durability than the end milling cutters made of standard high speed steel, but cobalt cutters are more expensive. The remaining cost of this kind of cobalt high speed steel is sometimes unreasonable, unless it is in the case where the cutting edge of cemented carbide tool is broken and cannot be machined due to mechanical vibration or the general high speed steel alloy is blunt due to the simple hardness of the workpiece. The end milling cutter is sometimes replaced by all hard and feed cutters. Its cost is higher than that of high-speed alloy steel, but its cutting speed is 3 times that of high-speed alloy steel. The end milling cutter sometimes adopts the way of inserted carbide. The end milling cutter can achieve a medium finish. When machining the surface, it can be comparable with the face milling cutter at a relatively low speed. Throwing knife: Flying cutter is a single tooth surface cutting cutter. Because of its low cutting speed, this cutter is mostly used for installation rather than in large-scale production. Fly to a flat surface that needs to be placed very precisely or even more lubricated. The inserted high-speed steel or hard alloy cutter head of the flying cutter is clamped with something similar to the lathe head. Although the flying knife is very cheap and can be bought in shops, its cutting speed is very slow and there are serious security risks. The tool sensation and centrifugal force flying to the outer tail end are noteworthy work for flying knife cutting. 2. Circumferential incision Circumferential cutting (also called shaping cutting), as its name implies, is to cut the inner and outer surfaces of the workpiece with the side teeth of the cutter. The commonly used circumferential cutting cutter for Z is the end milling cutter. We need to be alert to the direction of forward milling. We need to know that the difference of forces depends on the feed direction. When cutting with side teeth, the tool can be driven by the driving wheel along a certain path to the workpiece - called forward milling. In forward milling, the direction of rotation of the cutter in the workpiece always makes the processing feed axis and workpiece pass through the cut point. Maybe you can make the feed direction of the tool reverse along the circumference. The direction of the cutting teeth is opposite to the direction of the feed axis, which is called reverse milling. It is important to understand the differences between them for safety, service life and finish. 3. Step and cavity processing Slotting to the cutting depth: Before machining the cavity, a hole should be first machined at the rough machining depth - this operation is similar to drilling, called a pin, and is completed with an end milling cutter, and then the cavity is machined with the side face of the milling cutter. The slotting milling of milling cutter with three grooves or four grooves can be completed by correctly grinding one or more teeth passing through the center surface. Most milling cutters with two grooves can perform plunge milling, but not all of them can! Some cutters with hollow centers and no cutting edges cannot be inserted and milled. Cutting depth of bevel milling cutter: insert milling with the side face of the end milling cutter is called bevel milling or bevel milling for short. This method is not often used in manual operations. It is mainly used in numerical control processing because it is simpler to discharge chips than direct drilling, and it can make the coolant directly reach the processing part. Spiral insert milling has two advantages over linear insert milling. First, it can prevent the tangency between the cutter and the cavity, and then avoid leaving machining marks on the finished surface, which is called spiral bevel milling. The tool is spirally lowered. 4. Forming and cutting Chamfering: Chamfering is generally used in the mold cavity and the places with feet outside, and the internal chamfer is generally called the internal fillet. The tooth line of chamfering cutter can be divided into internal concave and external convex. Machining workpiece with forming milling cutter in lathe is called forming processing. There are two kinds of end milling cutters used for machining concave angles, namely ball end milling cutter and round end milling cutter. Customized molding: When the machining shape is special, the simple molding tool of Z in the workshop is a flying knife. Its high-speed steel blade can process workpieces of any shape without special equipment. 5. Drilling/Reaming 6. Boring

In the process of turning axis workpieces in numerical control machining, there will be problems such as the accuracy and surface roughness can not meet the requirements. Analyze according to the specific process of turning. 1、 The reason and solution of dimension precision not meeting the requirement 1. Due to the operator's carelessness in NC machining, errors occur when measuring children, or the dial is wrong and used improperly Therefore, it is very important to be careful and use the dial correctly when measuring. As far as the middle carriage handle dial is concerned, the dials of various types of lathes are different. Each small scale can be calculated by the following formula: Turning tool movement interval=carriage lead screw interval/total number of scale divisions (mm) If you know the scale value of each grid in the future, you should pay attention to the gap between the lead screw and the nut when using. Sometimes the turning tool will move even though the dial is rolling. The turning tool will not move until the gap is turned. Therefore, when using, if the scale is turned too many times, it is not allowed to turn it back only a few times, but to turn it back and then align the scale from the beginning. 2. The measuring tool itself has errors or is not placed correctly during operation Before using the measuring tools, they must be carefully checked and adjusted, and they must be placed correctly. 3. Because of the change of temperature, the workpiece size changes During cutting, the chip deforms, and each molecule of the chip moves with each other, while they collide and generate a lot of heat when moving. In addition, because of the conflict between the chip and the front of the turning tool, the conflict between the rear of the turning tool and the surface of the workpiece also generates heat, which directly affects the tool and the workpiece. Of course, high heat Z is chip (about 75%), followed by turning tool (about 20%) and workpiece (about 4%, and 1% in air). When the workpiece is heated, its diameter increases (about 0.01~0.05 mm, and the change of cast iron is larger than that of steel), and after cooling, its diameter shortens, forming waste products. Therefore, it cannot be measured when the workpiece temperature is very high. If the side measurement is necessary, pour enough cutting fluid during turning to prevent the workpiece temperature from increasing; Secondly, use the method of separating rough and fine turning. 4. Blank surplus is not enough The bending of the blank itself has not been straightened, and the deviation of the base hole is formed.

CNC machining is also called CNC milling machine. The general milling machine is developed on the basis of numerical control processing. The two processing technologies are basically the same, and the structure is also somewhat similar. Under the control of the numerical control processing integrated digital control system of the general milling machine, the code can be controlled more accurately. In addition to the features of ordinary milling machine, it also has the following features: 1。 The NC machining part has strong adaptability, flexibility, and can shape the contour shape, especially complex or difficult to control the size of parts, such as mold parts, shell parts, etc. 2。 CNC can process parts that cannot be processed, and also can process machines of ordinary machine tools, such as complex curve parts described by mathematical models and three-dimensional space surface parts. 3. CNC can be used to process parts requiring multi-channel processing after clamping and positioning. 4. Numerical control machining has high precision, stable and reliable machining quality, and it also avoids operator's operation mistakes. 5。 NC processing has a high degree of automation, which can reduce the labor intensity of operators. It is conducive to automation of production management. 6。 High production efficiency. NC machining generally does not require the use of special process equipment such as special fixtures. When replacing workpieces, it is only necessary to call and store the data of clamping tools and adjusting tools in the processing of CNC equipment, thus greatly reducing the production cycle. Secondly, CNC machining and milling machine, boring machine and drilling machine functions make them highly centralized and greatly improve production efficiency. In addition, the spindle speed and feed speed of NC machining are infinitely variable, which is conducive to selecting the best cutting amount of Z.

In terms of machining skills, only by strictly abiding by these skill requirements can the processed products become more standard and reasonable. The detailed skill requirements are as follows: (1) There shall be no scratch, scratch and other defects damaging the surface of the parts on the surface of the parts. (2) Remove oxide scale from parts. (3) Undeclared shape shall conform to the requirements of GB1184-80, and the allowable error of unspecified length scale shall be ± 0.5mm. (4) The casting service belt is symmetrical to the basic dimension equipment of the blank casting. (5) When installing rolling bearings, it is allowed to use oil heating for hot installation, and the oil temperature shall not exceed 100 ℃. (6) When installing the hydraulic system, it is allowed to use sealing filler or sealant, but it should be prevented from entering the system. (7) The parts and components to be installed can only be installed with the certificate of inspection. (8) Before installation, it is necessary to tidy and clean the parts, without burrs, fins, oxide skin, rust, chips, oil stains, colorants and dust. (9) Before installation, the primary cooperation scale of parts and components, especially the interference cooperation scale and relevant accuracy shall be rechecked. (10) Parts shall not be knocked, bumped, scratched or rusted during installation. (11) When fastening screws, bolts and nuts, it is prohibited to impact or use inappropriate screwdrivers and wrenches. The screw groove, nut, screw and bolt head shall not be damaged after fastening. (12) For fasteners required by regular tightening torque, it is necessary to select a torque wrench and tighten according to the regular tightening torque. (13) The remaining adhesive shall be removed after bonding. (14) The outer ring of the bearing must not get stuck with the semicircular hole of the open bearing seat and bearing cover; The semicircular holes of the bearing outer ring, open bearing seat and bearing cover shall be touched well. When viewed by painting, they shall be evenly touched within 120 ° symmetrical to the centerline of the bearing seat and 90 ° symmetrical to the centerline of the bearing cover. When viewing with a feeler gauge within the above range, the 0.03mm feeler gauge shall not be inserted into 1/3 of the width of the outer ring. (15) The bearing outer ring should touch the end face of the bearing cover at the locating end evenly after installation. (16) After the rolling bearing is installed, the rolling shall be flexible and stable by hand. (17) The joint surface of the upper and lower bearing pads shall be close to each other and cannot be checked with a 0.05mm feeler gauge. (18) When fixing bearing pads with locating pins, drill and ream the matching pins under the condition that the pad mouth and end face are equal to the opening and closing surfaces and end faces of the relevant bearing holes. The pin shall not be loose after driving. (19) The alloy bearing liner shall not be used when its surface is yellow. There shall be no nucleation in the regular touch angle. The nucleation area outside the touch angle shall not be greater than 10% of the total area of the non touch area. (20) The reference end face of the gear (worm gear) should fit with the shaft shoulder (or the end face of the positioning sleeve), and cannot be checked with a 0.05mm feeler gauge. The perpendicularity between the gear reference end face and the axis shall be ensured. (21) Before assembly, strictly check and remove the sharp corners, burrs and foreign matters left during part processing. Make sure that the seal is not scratched when it is installed. (22) Cold shut, crack, shrinkage cavity, penetrating defect and serious damage defect are not allowed on the surface of casting. (23) The castings shall be cleaned and free of burrs and flash. The gating and riser on the non processing indication shall be aligned with the casting surface. (24) The casting words and marks on the non machined surface of the casting shall be clear and legible, and the position and font shall meet the requirements of the drawing. (25) For castings, the sprue and riser, flying spurs, etc. shall be removed. The residual amount of gating and riser on the non machined surface shall be leveled and polished to meet the surface quality requirements (26) The molding sand, core sand and core bone on the casting shall be removed and cleaned. (27) For the inclined parts of the casting, the standard service belt shall be symmetrically equipped along the inclined plane. (28) Correct the wrong type and boss casting deviation to ensure smooth transition and ensure the appearance quality. (29) The surface of the casting shall be flat, and the gate, burr, sand, etc. shall be removed and cleaned. (30) Casting defects such as cold shut, crack and hole which are harmful to application are not allowed. (31) Before painting, it is necessary to remove rust, oxide skin, grease, dust, soil, salt and dirt on the surface of all steel products that need to be coated. (32) The non machined surface of machine product castings shall be shot blasted or roller treated to meet the requirements of cleanliness Sa2 1/2.

Recently, due to the crash of the Boeing Company's aircraft, the aircraft crashed shortly after takeoff. All 157 people on board, including 8 Chinese compatriots, were killed. We deeply mourn for the victims and observe silent mourning for the victims. The wreckage of the Ethiopian Airlines aircraft at the scene of the accident is not large and severely twisted, which indicates that the aircraft was disintegrated under strong impact. Since 2001, Boeing has cut 40% of its labor force, accelerated the path of asset light operation, and sent out the company's core mechanical parts, which can save the company's costs. The company is committed to developing innovative aircraft. The current aircraft manufacturing mainly adopts the equipment manufacturing mode of globalization and cooperation, so the quality of machining suppliers is particularly important. The aircraft is composed of high-precision parts and components, which are difficult to manufacture. The production of this type of parts and components requires CNC machine tools. CNC machine tools automatically process the parts to be processed according to the prepared processing program. We program the processing route, process parameters, tool path, displacement, etc. of the parts according to the instruction code specified by the CNC machine tool, so as to command the machine tool to process the parts. The parts produced in this way have high accuracy and efficiency. Advantages of CNC/CNC machine tools: 1. High processing precision and stable processing quality. 2. It has strong adaptability to the processing object, adapts to the characteristics of single piece production of products such as molds, and provides a suitable processing method for mold manufacturing. 3. Multi coordinate linkage can be carried out, and parts with complex shapes can be processed. 4. When machining parts are changed, it is generally only necessary to change the NC program, which can save production preparation time. 5. The machine tool itself has high precision and rigidity, and can choose favorable processing amount with high productivity. 6. High degree of automation of machine tools can reduce labor intensity. 7. It is conducive to the modernization of production management. CNC machine tools use digital information and standard code to process and transfer information, and use computer control methods, which lays a foundation for the integration of computer-aided design, manufacturing and management. 8. High reliability. High quality parts, starting from me.

Unsafe factors during machining In the process of machining magnesium alloys, the chips and fine powders generated are subject to the risk of combustion or explosion. During the processing of magnesium alloy, the factors influencing the chip temperature rise to the flash point or combustion are as follows: a. The relationship between machining speed and cutting speed. The generation of cutting heat increases in proportion to the cutting speed. The higher the relative temperature, the greater the possibility of ignition. b. Other factors. The feed rate or cutting amount is too small; The pause time during processing is too long; The back angle and chip space of the tool are too small; High cutting speed is adopted without using cutting fluid; Sparks may occur when the tool collides with the dissimilar metal core lining embedded in the casting; Magnesium chips accumulate around or under the machine tool. Safe operation procedures for machining a. The cutting tools shall be kept sharp, and large back angle and clearance angle shall be grinded; It is not allowed to use blunt, chip stuck or broken tools. b. Generally, large feed rate shall be used for processing as far as possible, and small feed rate shall be avoided to produce chips with large thickness. c. Do not let the tool stop on the workpiece halfway. d. Use mineral oil coolant to reduce temperature drop when using micro cutting amount. e. If there is steel core lining in magnesium alloy parts, it is necessary to avoid sparks caused by collision with the tool. f. Keep the environment tidy and clean. g. It is strictly prohibited to smoke, make fire, electric welding and other operations with fire source in the processing work area. 3. Safety problems in grinding Magnesium powder is easy to burn and will cause explosion when suspended in air. Therefore, the following precautions must be taken when grinding magnesium alloy parts: a. There must be a grinder specially used for processing magnesium alloy parts. Thoroughly clean the vacuum cleaner before dressing the grinding wheel. b. When reworking and grinding the surface of magnesium alloy parts that have been etched and washed with chromate, sparks may be caused, so be careful not to allow dust to gather nearby. c. The grinding equipment operators shall use smooth hats, smooth gloves and smooth flame retardant clothing without pockets and cuffs. The apron or protective clothing used shall be clean and easy to take off. d. Magnesium scraps shall be cleaned in time when they are stored, and Z-long storage time limit shall be set. e. Sufficient yellow sand shall be stored in the working area to prevent fire fighting. 4. Treatment of magnesium chips and fine powder Scraps must be stored separately and cannot be exposed to rain The magnesium waste generated during processing shall be packed in barrels and soaked with special cutting fluid for magnesium processing. It shall be placed in a ventilated place that cannot be exposed to rain and water. The cover shall not be covered to allow the hydrogen that may be generated to volatilize naturally (hydrogen may cause explosion if it is not volatilized sufficiently). Smoking, welding and other behaviors with fire source are strictly prohibited around. 5. Extinguishment of magnesium chip combustion a. Class D extinguisher. The material is usually sodium chloride based powder or a graphite based powder that has been passivated. The principle is to extinguish the fire by removing oxygen. B. Covering agent or dry sand. Small area fire can be covered by it, and its principle is to smother the fire by removing oxygen. c. Cast iron chips. It can also be used without other good fire extinguishing materials. Its main function is to reduce the temperature below the ignition point of magnesium, rather than smothering the fire. In a word, under no circumstances can water or any other standard fire extinguisher be used to extinguish the fire caused by magnesium. Water, other liquids, carbon dioxide, foam, etc. will react with the burning magnesium, and strengthen the fire rather than suppress it.

Do you know what the role of non-standard parts processing is? In fact, this is still quite common in our industrial industry, but for some laymen, it may be unfamiliar, but those who learn to use it may not know what its role is, which still needs to be understood by everyone. Of course, we will gradually know some in the process of operation, so let's take a look at what the role of non-standard parts processing is! The non-standard parts processing center is an efficient and high-precision CNC machine tool. The workpiece can be processed in multiple processes in a single clamping process. At the same time, it is equipped with a tool library and has the function of automatic tool change. The non-standard parts machining center can complete the linkage control of three or more axes to ensure that the cutter can process the disorderly surface. In addition to linear interpolation and arc interpolation, non-standard parts machining center also has various functions such as fixed machining cycle, automatic compensation of tool radius, automatic compensation of tool length, graphic display of machining process, man-machine conversation, automatic fault diagnosis, offline programming, etc. Processing of non-standard parts The role of non-standard parts processing non-standard parts machining center is developed from CNC milling machine. The big difference between zui and CNC milling machine is that the machining center has the ability to automatically exchange machining tools. After installing tools of different uses on the tool magazine, the machining tools on the spindle can be changed through automatic tool change equipment in one clamping process to complete multiple processing functions. The role of non-standard parts processing in industrial production involves materials, processes, costs, quantity of use and other issues. Many parts cannot be produced on a large scale by machines, which requires some special processes to process small-scale or small non-standard parts. The center may also involve the process of craftsmanship. Generally, CNC, rapid tooling, vacuum silica gel mold and other processes are mainly used to complete small batch production. These are the functions of non-standard parts processing. The operators understand these professional knowledge clearly, which is still very helpful to the operation. Robot parts processing

At present, CNC machining is the main processing method used by the manufacturing industry and precision parts manufacturers. CNC machining center also has a very high position in many processing equipment. What types of workpieces can CNC machining centers process? 1. Box parts; Generally, it refers to parts with multiple hole systems, cavities inside and a certain length width height ratio. Its characteristics are: it needs to process multi station holes and planes, and has high tolerance requirements, especially the form and position tolerance. It often goes through milling, drilling, expanding, boring, reaming, spot facing, threading and other processes. Ordinary machine tools cannot complete the processing, so CNC machining center is required to complete the processing 2. Complex surfaces; Generally, there are several kinds of complex curved surface workpieces, such as cam, cam mechanism, integral impeller type, mold type, spherical surface, etc. 3. Heterogeneous parts; It mainly refers to the parts with irregular surface structure and internal structure, which need to be mixed with point, line and surface processing at each station. It is difficult to ensure the processing accuracy of ordinary machine tools, and CNC machining centers can be fully competent. Reduce processing errors and improve processing efficiency. The team of Shenzhen Huiwen Intelligent Manufacturing Technology Co., Ltd., established in 2010, is located on the first floor of Building F3, Tianyou Maker Industrial Park, Fuyongli New Lake, Bao'an District, Shenzhen. It has long been committed to the processing of high-precision, difficult and easily deformed metal and plastic parts, the small and medium-sized production and manufacturing of light alloy and composite materials (such as aluminum alloy, carbon fiber, etc.) parts, and the procurement and customization of robot parts. Huiwen Zhizao can currently provide products with high quality, low cost and timely delivery in the following aspects.

CNC machining has the following advantages: ① The number of tooling is greatly reduced, and complex tooling is not required for processing parts with complex shapes. If you want to change the shape and size of parts, you only need to modify the part processing program, which is applicable to the development and modification of new products. ② The NC machining quality is stable, the machining accuracy is high, and the repetition accuracy is high. It meets the processing requirements of precision robots and high-end automation equipment. ③ CNC machining has high production efficiency in the case of multiple varieties and small batch production, which can reduce the time for production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the best cutting amount. CNC machining ④ It can machine complex surfaces that are difficult to machine by conventional methods, and even some unobservable machining parts by CNC. Huiwen CNC machining center is suitable for medium and small batch production with complex part shape, high precision requirements and frequent product replacement. New and old customers are welcome to send drawings for evaluation~ CNC machining has the following disadvantages: 1) High processing cost not bad In many parts processing technologies, CNC processing should be one of the most expensive processes. 2) Long processing time CNC machining cycle is long, which is well-known. When the machining design of CNC parts has special requirements (such as precision tolerance requirements and thin-wall design), special tools, more precise quality control, lower processing speed, and more complex processing steps need to be used, which will seriously affect the time. CNC machining 3) High equipment maintenance cost The disadvantage of NC machining is that machine tools and equipment are expensive and maintenance personnel are required to have a high level.

cnc machining refers to precision machining controlled by computer, which is mainly used for processing various precision parts. What are the causes of common failures in ordinary CNC processing? What are the causes of over cutting during machining? 1、 Causes of common faults in cnc machining 1. Overload. Causes: excessive cutting, frequent positive and negative rotation, spindle motor failure, spindle drive installation failure. 2. The spindle does not rotate. Cause: The spindle drive installation fails, the CNC installation cannot output the speed signal, the spindle motor fails, the spindle drive installation fails, and the drive belt is broken. 3. The spindle speed deviates from the command value. Cause: The motor is overloaded, the spindle speed command output from the CNC system is faulty, the speed measurement installation is faulty, or the speed response signal is disconnected. 4. Abnormal noise and vibration of the spindle. Cause: In the process of deceleration, the spindle drive is installed with problems, such as the regeneration circuit fault in the AC drive. Precision hardware parts 2、 Causes of over cutting in cnc machining 1. The arc machining of the machining center is excessively cut. If the radius rD of the selected tool is too large and exceeds the radius r of the arc to be processed, it is likely to cause over cutting when the internal summary of arc machining is stopped in CNC machining. The NC machining program is compiled based on the theoretical summary of the workpiece path, without considering the motion path of the tool in the actual machining process. Due to the existence of the tool radius, the actual tool path becomes thicker and does not coincide with the programmed path. In order to get the correct summary of the workpiece surface, the tool radius compensation command is required to set between the tool path and the programming path. Otherwise, the over cutting of the workpiece cannot be prevented. 2. Identification of over cutting during linear machining. If the tool radius is too large when cnc machining the workpieces composed of linear segments, it is likely to present the phenomenon of over cutting, leading to workpiece failure. It can be judged by the positive and negative scalar product of the correction vector corresponding to the programming vector. So that's the end of today's explanation. That's all for today. I believe you have a certain understanding of the common faults in CNC processing and the causes of over cutting. Thank you for your patience.