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

The process of precision parts processing, companies must not only ensure its quality, for the external aesthetic generosity level, but also must be careful to maintain. In order to better ensure that precision parts will not be corroded by sweat, gas and other ingredients, so that it has been in the factory situation, to enhance the use of the term. Must be published in the parts to carry out packaging after the choice of individual sealing packaging method, at the same time must also use automotive gasoline or ethanol to carry out scrubbing, this work needs to wear gloves to work and drying, followed by cotton wool to carry out protection. In the machining of various forms of mechanical parts, the balance screw is difficult to process because of its deep opening slot, small total width and small dimensional tolerance range of specifications, which makes it very easy to scratch and difficult to guarantee the size. From the traditional processing process, combined with the current measurement tools, can be carried out before processing the grinding and polishing of the mold shell and the wetting of the slot, and at the same time can also design a clamping scheme mold sleeve, in the processing of mechanical parts, so that the balance screw and the mold sleeve are processed at the same time, there is a small gap between the mold sleeve and the product workpiece, so not only to improve the rigidity of the slot, reduce the deformation of the This not only improves the stiffness of the opening slot and reduces the probability of deformation, but also enables the balance screw to achieve the accuracy specified. The standard is the point, line, and surface used to specify the geometric correlation between the geometric factors of the manufacturing target. For a mechanical part, the standard is the point, line and surface on which other points, lines and parts of the part are defined. In the design of equipment parts and production process, according to the different provisions of the selection of what point, line, surface as a standard, is one of the key elements that immediately jeopardize the performance of the parts processing process and the specifications between the surface, the precision of the parts. According to the role and use of different places, the standard can be divided into two categories of design program standards, processing process standards.  

1. Rational use of CNC machining tools The light knife for processing steel and copper should be strictly distinguished and used. The allowance of the light knife should be reasonable, so that the smoothness of the workpiece and the service life of the tool will be better. 2. Before CNC machining, use a calibration meter to check whether the tool swings within the allowable tolerance range. Before machining, use an air gun to clean the tool head and lock tip, or use a cloth to clean them. Too dirty will have a certain impact on the accuracy and quality of the workpiece. 3. During clamping, pay attention to see whether the name and model of the CNC workpiece and the program sheet are the same, whether the material size matches, whether the clamping height is high enough, and use a caliper to clamp the number. 4. The CNC processing program sheet shall be consistent with the direction of the reference angle marked on the mold, and then check whether the upper 3D drawing is correct, especially for the workpieces that have been drilled with water delivery, and be sure to see whether the 3D drawing is consistent with the upper workpiece water delivery. If there is something unclear, report it to the programmer or find a fitter to check the lower 2D drawing to see whether the 2D and 3D reference angles are consistent. 5. The program list of CNC processing documents should be standardized, including the mold number, name, program name, processing content, tool size, feed amount, especially the tool clamping safety length, the reserved allowance for each program, and the smooth knife. It should be clearly indicated. The place where the R surface and the plane should be connected should be indicated on the program list. The operator should increase 0.02~0.05mm during processing. The operator should first process, and stop to see if the connection is correct after several strokes, Use your hand to check whether the level is raised. If not, lower the gong. 6. Before processing, it is necessary to understand the contents of the CNC processing program sheet. The program sheet must have a 2D or 3D diagram and be marked with "X length, Y width, Z height" hexagonal data, All planes shall be marked with "Z" value, which is convenient for the operator to check whether the data is correct after processing, and those with tolerance shall be marked with tolerance data. 7. The machine tool processing speed shall be strictly controlled by the operator. The F speed and the S spindle speed shall be reasonably adjusted. When the F speed is fast, it shall be faster than the S spindle. The feed speed in different areas shall be adjusted. After processing, the machine can be unloaded only after the quality is checked, and the processing should be perfect at one time.

What is CNC machining boring? CNC boring refers to expanding or refining the original hole on the workpiece. The boring feature of CNC machining is to correct the eccentricity of the lower hole, obtain accurate hole position, and obtain high-precision roundness, cylindricity and surface finish. Therefore, boring is often used in the final process. Boring by CNC is a kind of difficult machining compared with other machining. It only needs to adjust a blade (or blade holder) to process micron sized holes like H7 and H6. What are the characteristics of CNC boring? 1. Tool rotation CNC machining is different from lathe machining. Because of the tool rotation during machining, it is impossible to timely grasp the situation of the tool tip during machining to adjust the feed rate. It is also impossible to change the machining diameter just by adjusting the numerical control button, like the numerical control lathe. This has become a big obstacle to fully automated processing. It is precisely because the machining center does not have the function of automatic machining diameter adjustment (except for those with U-axis function), it requires that the boring tool must have a fine adjustment mechanism or automatic compensation function, especially when fine boring, it must be adjusted at the micron level according to the tolerance requirements. In addition, because the chip flow direction is constantly changing when boring the machining center, it is much more difficult to cool the tool tip, workpiece and discharge the chip than it is when machining the lathe. Especially when the vertical machining center is used for rough boring of steel blind holes, this problem has not been completely solved so far. 2. Flick knife The most common and troublesome problem in boring is tool spring. The main reasons for tool spring on the machining center are as follows ① Rigidity of tool system: including the rigidity of tool handle, boring bar, boring head and intermediate connecting parts. Because it is cantilever machining, especially when machining small holes, deep holes and hard workpieces, the rigidity of the tool is particularly important. ② Dynamic balance of the tool system: if the tool itself has an unbalanced mass relative to the rotation axis of the tool system, it will cause chatter due to the unbalanced centrifugal force during rotation. Especially in high-speed machining, the dynamic balance of tools has a great impact. ③ Fixing rigidity of the workpiece itself or the workpiece: for example, some smaller and thinner parts cannot be fully fixed with a reasonable fixture due to their insufficient rigidity or the shape of the workpiece. ④ The shape of the blade tip: the cutting resistance varies with the front angle, escape angle, tip radius and chip breaking groove shape of the blade.

CNC machining is developing towards high speed and high efficiency. This includes the speed control of CNC machining. To make full use of the effective working stroke, the moving parts must be able to accelerate to the high speed stroke in a very short time and stop accurately in the high speed stroke. This is why we need to control the speed of CNC processing in Dongguan. According to the open control idea, we propose a method that can automatically accelerate and decelerate the motion of CNC machine tools according to any curve. This method pushes the automatic acceleration and deceleration control from the traditional fixed mode to the new flexible mode, and explores a new way to effectively improve the dynamic performance of CNC machine tools. 1. Flexible acceleration and deceleration control In CNC machining, the specific automatic speed control function is usually directly realized by the system program. In this way, it is necessary to change the acceleration and deceleration characteristics of the system or modify the NC program by adding or subtracting control, so ordinary users cannot make the NC machine tool have the best acceleration and deceleration performance according to their own wishes. Therefore, the flexible acceleration and deceleration control method proposed by us adopts the principle of database, divides the acceleration and deceleration control into two parts: acceleration and deceleration description and implementation, and separates the acceleration and deceleration description from the system program. In the NC system software, a general control channel independent of the acceleration and deceleration database content is designed to independently complete the acceleration and deceleration calculation and trajectory control. 2. Flexible automatic acceleration control Set the acceleration curve, analytical curve and non analytical curve, and store them as templates in the acceleration and deceleration curve library in the form of a number table. 3. Flexible automatic deceleration control The acceleration control is also stored in the acceleration and deceleration curve library as a template in the form of a number table. Reasonable automatic acceleration and deceleration control is an important link to ensure the dynamic performance of CNC machine tools. The traditional automatic acceleration and deceleration control based on fixed curve is not easy to ensure that the acceleration and deceleration process are compatible with the machine tool performance due to the lack of flexibility, and it is difficult to achieve the best dynamic characteristics of the machine tool movement.

1、 CNC machining center or engraving and milling machine? CNC machining centers and engraving and milling machines are commonly used mechanical equipment. They also have similarities and differences. It is difficult to have an accurate answer if we insist that CNC machining centers are better than engraving and milling machines. 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 it better to use CNC machining center or engraving and milling machine for rigidity The rigidity of the non moving part of 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 because the engraving and milling machine requires more flexibility. 3、 Spindle speed is faster for CNC machining center or engraving and milling machine The spindle speed of CNC machining centers is generally required to be 0-8000rpm. Although high-speed machining centers can achieve a high speed, generally speaking, engraving and milling machines have a high speed requirement. The engraving and milling machines require high-speed CNC systems. The spindle speed is generally 3000-3000rpm. The spindle speed of some specific engraving and milling machines is higher than that of high-speed machining centers. 4、 CNC machining centers and engraving and milling machines have different processing ranges CNC machining center is used to complete the equipment processing of workpieces with large milling amount, and can perform re 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. In general, if we insist on comparison, we cannot distinguish between high and low. For example, we cannot use carving and milling machines in heavy cutting, and machining centers are useless in fine lettering. We can only say that both of them have their own characteristics and fields of action, and we cannot make a hard comparison.

Arrangement principle of machining sequence of bed parts 1. Principle of lathe from rough to finish: the machining sequence of each surface shall be semi finish machining according to rough machining leaves_ Finishing_ The precision machining shall be carried out in sequence to gradually improve the machining accuracy of the surface and reduce the surface roughness value. 2. The principle of lathe datum first: the surface used as precision datum shall be processed first, because the more accurate the surface of positioning datum, the smaller the clamping error. Since the inverted 40 outer circle is the benchmark of coaxiality, the lathe should first process this surface, and then process other surfaces. 3. The principle of lathe priority: the main working surface and assembly base surface of the parts shall be processed first, so that possible defects on the main surface of the blank can be found as early as possible. The secondary surface of the lathe can be alternated and placed after the main processing surface has been processed to a certain extent and before the final finishing. 4. The principle of turning from near to far: Generally, after the workpiece is clamped, the parts close to the tool rest are processed first, and the parts far away from the tool rest are processed later, so as to shorten the tool travel distance and reduce the idle stroke time. It is also conducive to maintaining the cutability of blanks or semi-finished products and improving their cutting conditions. For the inner hole of lathe parts, the inner cone hole shall be processed first, and then φ 30mm inner hole, final machining φ 20mm inner hole. Key processing technologies: The key technology of precision machining of lathe parts. Conventional machine tool design and manufacturing have great tolerance in all aspects of technology. Each link of ultra precision machine tool is basically in a state of technical limit or critical application. Any link that is not considered or handled properly will lead to overall failure. Therefore, it is necessary to have a very comprehensive and profound understanding of the whole machine tool system and each part of the technology in design. It is necessary to carry out the comprehensive design in a very detailed way based on the feasibility and the overall optimization. High rigidity and high stability machine tool body structure design and manufacturing technology. Especially for LODTM machine tools, due to the large body, its own weight, and the large change in the weight of the bearing workpiece, any small deformation will affect the machining accuracy. In addition to meeting the requirements in terms of materials, structural forms and processes, the structural design must also take into account the operability of the machine tool during operation. Ultra precision spindle technology for lathe parts. The scheme of aerostatic spindle is often adopted for medium and small machine tools. The aerostatic spindle has small damping and is suitable for high-speed rotary machining applications, but its bearing capacity is small. The rotary accuracy of aerostatic spindle can reach 0.05 μ m。 The spindle of LODTM machine tool bears large size and weight of workpiece, so hydrostatic spindle is generally preferred. Hydrostatic spindle has large damping, good vibration resistance and large bearing capacity, but it needs to take liquid cooling and constant temperature measures because of its high speed heating. Hydrostatic spindle rotation accuracy can reach 0.1 μ m。 In order to ensure the accuracy and stability of the spindle, both the air pressure source and the hydraulic pressure source need constant temperature, filtering and pressure precision control processing. High precision air, liquid, temperature, vibration and other working environment control technologies for lathe parts. Vibration isolation and horizontal attitude control of machine tool. The influence of vibration on ultra precision machining is very obvious, even for long-distance vehicles. Special foundation treatment and air floating vibration isolation composite measures shall be taken for machine tool vibration isolation. The air floating vibration isolation system of the machine tool body shall also have the automatic leveling function to prevent the influence of the horizontal state change on the processing during the processing of the machine tool. For machine tools with high LODTM vibration isolation requirements, the natural frequency of the vibration isolation system is required to be below 1HZ.

As the name implies, lathe parts are products processed by lathes. Lathe parts can be divided into many kinds according to different types of lathes. The most common ones are automatic lathe parts, CNC lathe parts, instrument lathe parts, etc. The hardware materials used for lathe parts include copper, iron, aluminum, stainless steel, etc. The common processing areas are Shenzhen, Dongguan and surrounding areas. Lathe parts are widely used in electronic appliances, hardware tools, toys, plastics and other industries. Compared with other fasteners, its main feature is precision, with a tolerance of plus or minus 0.01MM, or even more accurate. Of course, its price is much higher than that of other fasteners. Automatic lathe parts are parts processed by automatic lathe. The maximum processing diameter is 20mm, and the maximum processing length is 90mm. Because of small processing parts and high speed, the price is relatively low, the processing accuracy is high, and the tolerance can be controlled within plus or minus 0.01mm. CNC lathe parts are parts processed by CNC lathe. The maximum processing diameter can reach 60, and the maximum processing length is 300 mm. The processing parts are large, complex in shape, and high in accuracy. They can be cut and turned several times, with a tolerance of plus or minus 0.002 mm. They have advantages for processing stainless steel products. Because of expensive machines and low processing efficiency, the processing cost is relatively high. The reason why the cost of lathe parts is higher than that of other hardware parts is because of the high precision, low speed and low output determined by the processing technology of turning. After a large part of the lathe parts are machined on the machine, they need to be processed twice to meet the functional requirements, such as: groove milling, drilling, edge milling, chamfering, etc.

1. Before processing each procedure, it is necessary to strictly confirm whether the tool is consistent with the procedure. 2. When installing the tool, confirm whether the length of the tool and the selected clamping head are suitable. 3. When the machine tool is running, it is forbidden to open the door to avoid flying knives or workpiece. 4. In case of tool collision during processing, the operator must stop immediately, such as pressing the "Emergency Stop" button or the "Reset" button or setting the "Feed Rate" to zero. 5. Each tool setting in the same workpiece shall be kept in the same area to ensure the accuracy of the CNC machining center when the tool is connected. 6. If excessive machining allowance is found during processing, "single section" or "pause" must be used to clear the X, Y, Z values, and then manually mill them off, and then swing them back to "zero" to let them run by themselves. 7. The operator shall not leave the machine tool or check the operation condition of the machine tool regularly during self operation. If it is necessary to leave midway, relevant personnel must be designated to check. 8. Clean the aluminum slag in the machine tool before spraying oil with the light knife to prevent the aluminum slag from absorbing oil. 9. Blow with air as much as possible in the roughening procedure, and inject oil in the light knife procedure. 10. The workpiece shall be cleaned and deburred in time after being unloaded. 11. When off duty, the operator must make timely and accurate handover to ensure that the subsequent processing can be carried out normally. 12. Before shutdown, ensure that the tool magazine is in the original position and XYZ axis is stopped at the center position, and turn off the power supply and the main power supply on the machine tool operation panel 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 many things that we should pay attention to 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, to a large extent, and the user's improper operation. The machine will be serviced irregularly. Before starting up, the machine will not be checked carefully, and the machine will not be preheated. Some companies, due to the bad environment, have the machine in a dark, humid and dusty environment for a long time, 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 solved in time, the service life of our machine will definitely be much longer, the processing accuracy and performance of the machine will be as new for a long time, the loss will be greatly reduced, and the replacement frequency of parts will be reduced, saving a lot of time and cost In case of any abnormal phenomenon during operation, please contact the manufacturer in time to avoid unnecessary loss.

The machining method of cnc workpiece surface 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 in the part drawing in some aspects due to technological reasons. For example, the machining requirements for some cnc machined parts are increased due to the non coincidence of datum. Or it may put forward higher processing requirements because it is regarded as precision reference. After the technical requirements for the surfaces of CNC machined parts are clarified, the final processing method that can guarantee the requirements can be selected accordingly, and the processing methods for several work steps and each work step can be determined. The selected cnc machining method should meet the requirements of part quality, good processing economy and high production efficiency. For this reason, 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 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 machining materials shall be considered. 3. The structural shape and size of CNC machined parts shall be considered. 4. Productivity and economy requirements shall be considered. High efficiency and advanced technology shall be adopted for mass production. It can even fundamentally change the manufacturing method of the blank, which can reduce the amount of labor in machining. 5. Consider the existing equipment and technical conditions of the factory or workshop When selecting processing methods, we should make full use of existing equipment, tap the potential of the enterprise, and give play to the enthusiasm and creativity of workers. However, continuous improvement of existing processing methods and equipment, adoption of new technologies and improvement of process level should also be considered.

1. When there is burr on the workpiece surface, the burr must be removed before measurement, otherwise the measuring tool will be worn and the accuracy of measurement results will be affected. 2. Do not use oilstone and emery cloth to rub the measuring tool surface, measuring surface and scribed line. It is forbidden for non measuring maintenance personnel to disassemble, refit and repair the measuring tool without authorization. 3. It is not allowed to use the measuring claw tip of the caliper as a scribe, compass or other tool, and it is not allowed to manually twist two claws or use the measuring tool as a clamp. 4. Do not touch the measuring surface of the measuring tool with your hand, because sweat and other damp dirt on your hand will pollute the measuring surface and make it rust. The measuring tool shall not be mixed with other tools and metal substances to avoid damaging the measuring tool. 5. The storage place of measuring tools shall be clean, dry, free from vibration and corrosive gas, and far away from places with large temperature variation range or magnetic field. The measuring tools stored in the measuring box shall be clean and dry, and no other sundries shall be stored. 6. After using the measuring tool, wipe off the surface stains and aluminum chips, loosen the fastening device, and coat the measuring surface with antirust oil when it is not used for a long time (more than 1 month). When the measuring tools are not in use, they should be put into the protection box. It is better to assign special personnel for full-time use, and make the annual audit record of the measuring tools tested by the authoritative unit.