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

What factors are related to the machining accuracy of cnc machining center dies In the process of mold processing, the machining center has higher and higher requirements for precision and surface processing quality. In order to ensure the mold processing quality, we should consider the selection of machine tools, tool handles, tools, processing schemes, program generation, operator requirements, etc. 1. High precision and high speed machining center With the improvement of product design requirements and the development of high-speed and high-precision processing technology, the quality of mold NC processing has been greatly improved, the mold processing speed has been greatly improved, the processing process has been reduced, the mold production cycle and clamping times have been shortened, and sometimes the time-consuming bench worker repair work can be eliminated. High speed and high precision machining of molds has gradually become one of the important contents of technological transformation of mold manufacturers. It is inevitable that high-speed CNC machining centers replace traditional low-speed machining, and the development of mold manufacturing technology will also bring us more rich product experience. 2. Use appropriate tool handle structure The use of high-speed and high-precision machining centers will also drive the updating of related process equipment. In particular, the impact of tools on NC machining quality and tool shank will become prominent. In the rotary cutting tool processing system, the chuck is closely connected with the machine tool (or its combination) to ensure the realization of the tool processing performance. The interfaces between machine tools and tool handles commonly used include HSK hollow tool handles and BT tool handles. The taper of the taper shank interface between the machine tool spindle and the BT tool shank is 24:7. This kind of tool shank connection mode is suitable for traditional low-speed machining. Because the BT tool shank and the machine tool spindle are only tapered, under the action of high speed centrifugal force, the taper clearance will increase, which will affect the quality of NC machining. Generally, when the spindle speed exceeds 16000 rpm, we will need to use the HSK hollow handle. The HSK cutter bar positioning structure is over positioning, providing standard connection with the machine tool. Under the pull of the machine tool, ensure that the short cone and end face of the cutter bar are closely matched with the machine tool. 3. Select a suitable tool for machining The rational use and selection of cutting tools will be an important factor affecting the quality of NC machining. Cemented carbide tools are more and more widely used. In high-speed machining, coated cemented carbide will replace most of the sharp steel tools, including simple tools such as reamers, ball cutters, and boring cutters. Coated cemented carbide will play an important role in high-speed machining tool materials and be applied to most conventional machining fields. Generally, we know that we will use large diameter tools for rough machining. In order to save costs and reduce the difficulty of tool manufacturing, we will use machine clamped carbide inserts to make rough machining as much as possible; In semi finish machining, the insert cutter with high speed and high feed is used to make the semi finish machining run fast; When finishing, try to use high-precision round mirror blade and carbide cutter bar to ensure the strength of the tool and cutter bar, which will save the expensive cost of using integral alloy cutter while maintaining the machining accuracy. During processing, we also need to pay attention to that the radius of the inner contour fillet on the finishing part must be greater than or equal to the radius of the tool. The tool with a radius smaller than the corner fillet radius is selected for processing in the way of circular interpolation or oblique interpolation, which can avoid the phenomenon of over cutting caused by linear interpolation and ensure the quality of the die finishing. 4. NC process plan In high-speed and high-precision machining, the importance of the design of NC process plan has been raised to a higher position. The whole process of machining must be controlled. Any mistakes will have a serious impact on the quality of the mold. Therefore, the process plan will play a decisive role in the processing quality. NC machining process planning can be considered as the state control of a system process plan from the blank to the part processing and molding. A good process plan is difficult in the whole design process, and it can only be obtained after continuous practice summary and modification. A large amount of information needs to be considered in the design process, and the relationship between the information is extremely complex, which must be guaranteed by the actual work experience of the programmer. Therefore, the design quality of process plan mainly depends on the experience and level of technicians. Generally, a complete NC machining process planning includes the following contents: 1) CNC machine tool selection. 2) Processing method selection. 3) Determine the clamping method of the part and select the fixture. 4) Positioning method. 5) Inspection requirements and methods. 6) Select the tool. 7) Error control and tolerance control in machining. 8) Define NC operation. 9) Numerical control process sequencing. 10) Cutting parameter selection. 11) Prepare NC process program sheet. 5. CAM software A good software can also improve the mold processing quality and efficiency. For example, UniGraphics and CIMIAMTRON are good mold processing software. In particular, the two kinds of software are rich in practical and different processing strategies. They are widely used in NC milling programming, turning programming, and WEDM programming. The mutual complementation has greatly improved the quality and efficiency of NC processing. CIMIAMTRON can add the screw function when removing rough machining in the offset area, which will make the actual cutting more stable, eliminate the sudden change of the feed direction connected between adjacent tool paths, reduce the acceleration and deceleration of the cutting feed, maintain a more stable cutting load, extend the tool life, and also play a good role in protecting the machine tool. Software is also just a tool. An excellent programmer has rich on-site machining experience and theoretical knowledge. At the same time, NC programmers who are proficient in software functions are the decisive factors in mold NC processing, playing a key role in the quality and efficiency of NC processing. To this end, a sound training system for programmers should be established. First of all, the designers should practice in the position of NC operation for a period of time, and the training of NC program design can only be carried out after passing the strict operation examination. In order to ensure the quality of the die NC processing, it is necessary to have a good NC program. 6. Operator The operators of machining centers are the executors of NC machining, and their control over the quality of NC machining is also obvious. They have the best understanding of the real-time status of machine tools, tool handles, tools, processing technology, software and cutting parameters in the process of performing processing tasks. Their operations have the most direct impact on NC processing, so the skills and sense of responsibility of the machining center operators are also the key factors to improve the quality of NC processing! Conclusion: Although hardware equipment such as machining center is critical, talent is the decisive factor affecting the quality of NC machining, because the professional ethics, skill level and sense of responsibility of programmers and machine tool operators determine how effective various advanced equipment can be. We must pay attention to all aspects of processing, especially human factors, so that the CNC machining center mold processing is more and more extensive.

Basic maintenance methods for CNC machining center Precise machines have relatively high requirements for functions in the process of use. In order to better solve such problems, we need to pay attention to how to maintain them better. For example, the maintenance of CNC machining centers is a very important thing. Whether the parts are normal and the program input is safe, etc. What basic methods should we pay attention to in maintenance? Top, cylinder One of the problems involved in the maintenance of CNC machining center is that the cylinder, sealing ring and cooperation surface are all very important. It is necessary to regularly check whether they are damaged. Sometimes the piston is stuck. Whether the parts are normal has a very important effect on the production power of the whole machine. Second, after sales Of course, after-sales service is also important. Some daily CNC machining center maintenance operations require after-sales service to complete. Good after-sales service can provide us with repair services without time and space constraints. Therefore, for us, this is a very important way to ask for help, and also a way to timely get the machine serviced.

CNC machining center is a CNC machine tool with the function of automatic tool change. The difficulty of tool removal of CNC machining center is one of the common failures. However, due to its complex structure, involving electrical, mechanical, pneumatic, hydraulic, etc., any loop link failure will cause the tool removal failure of the machine tool. Taking the tool removal failure of VMC650 CNC machining center as an example, the following is a brief introduction to the causes of tool removal failure and maintenance plan, hoping to help you: 1. Fault characteristics There is a VMC650 CNC machining center. It is very difficult to change the tool. When changing the tool, it is necessary to use a copper hammer or other metal to strike, and the tool handle can be removed only after vibration. In this way, there will be potential safety hazards. Long term impact will cause damage to the tool handle and affect the spindle accuracy. 2. Troubleshooting and inspection steps (1) Check the hydraulic cylinder and the end of the piston rod for wear, which causes insufficient downward travel of the pull rod to push the pull pin. (2) Check the diameter and height of the pull pin, and check whether the pull pin is reliably connected with the thread of the tool handle, otherwise it is easy to cause difficulty in removing the tool. (3) Check the deformation and wear of the spring and sleeve, which is the main reason why it is difficult to disassemble the cutter on the CNC milling machine or machining center. In the process of NC machine tool processing, due to the worker's proficiency and technical level, there is an inevitable phenomenon of tool breaking, which causes the deformation of spring and sleeve and makes it difficult to disassemble the tool. In case of wear and deformation during inspection, it shall be replaced in time. When replacing, ensure the consistency with the size and shape of the original parts. (4) The internal surface of the 7:24 taper hole should be maintained regularly, and there should be no bumping, pulling or rusting, otherwise it is easy to cause the radial runout and axial runout of the tool handle to exceed the tolerance, which will affect the machining accuracy. (5) Check whether there is strain on the inner hole surface and outer surface of the sleeve. If there is slight strain, use an oilstone to repair it. If the strain is serious, replace the parts. The main reasons are: the dirt in the spindle tool mounting hole is not completely removed, or the compressed air pressure is insufficient, which can not play a role in removing dirt. 3. Troubleshooting results Through dissection and inspection of this machining center, it was found that the causes of the failure were: after the travel switch was used for a period of time, the fastening screws were loose, which led to inaccurate positioning of the travel switch, insufficient downward distance of the hydraulic cylinder piston, insufficient downward pressure of the pull rod on the knife handle pull nail, and difficult knife folding. After we readjusted the position of the travel switch controlling the downlink, the problem was completely solved and the fault disappeared. These problems require us to do a good job in the maintenance of all aspects of the CNC machining center in daily use, reduce the occurrence of failures, and improve our processing efficiency and safe operating environment.

Tool change program and tool change fault detection of CNC machining center The tool change command of CNC machining center is M06 command. A new tool is called from the tool magazine and installed on the spindle. The lathe returns the old tool on the spindle to the tool magazine. After executing the M06 command, the tool will be automatically installed on the spindle. Machining center M06 is a non modal post action M function. Before the M06 command is executed, the G28 command must be used to make the machine tool return to the reference point, and all compensation must be canceled. This is because there is an incremental position detection element for the Z-axis. In order to ensure the reliability of the spindle quasi stop function during tool change, the machine tool must be returned to the reference point, otherwise the tool change operation may not be completed. Under normal circumstances, the main reasons for the failure of the tool change function of CNC machining center are: a wrong input or output signal, short circuit, open circuit, position detection failure, tool magazine disorder, tool counter error, and relay damage; Due to the hydraulic and pneumatic systems associated with it, the machinery is stuck, loosened, etc. However, there are some faults that are seldom encountered, especially when the data is ominous and there is no prompt, the fault point is hidden, the alarm information is few, or even there is no alarm, you need to observe and analyze carefully. In the automatic processing mode, when executing the tool change statement (M06), suddenly jump to the following interpolation statement, and directly process with the original tool without changing the tool. At the same time, the tools in the magazine are still in the preselection process. There is no alarm information. In general, it is common that the tool cannot be changed or the tool change statement cannot be executed. In this example, the tools in the automatic tool library are still in the preselection process, and the original tools are already being used for processing. In order to ensure personal and equipment safety, the machine must be shut down immediately. To further find out the cause, execute the tool change statement (such as "T2; M06") separately in MDI mode, and the tools can be exchanged. It is thus determined that it is not the problem of the executing agency itself. Whether the system operation is not standardized, the power supply voltage fluctuates greatly or other external interference factors cause the system to be disordered occasionally. Restart the operation, and the fault remains. In MDI mode, when the tool change and interpolation statements are consistent (such as: "T2; M06; G01X200.0Y150.0; M30;" The phenomenon of test run is exactly the same as that under automatic mode. It was decided to further check the timer (TIMER), counter (COUNTER), data table (DATA) and holding relay (KEEPRL) on both sides of the PMCPRM parameters. The manufacturer did not provide complete standard parameters and specific comparison meanings. This section has an identical processing center of this type. Set the two equipment to the same mode and exclude them one by one with normal parameters as reference standards. It was found that K03 # 1=1 in KEEPRL; The normal K03 # 1=0; This type of data is usually used to define or support the implementation of a function. Under the condition of ensuring immediate shutdown, change this bit to "0" for commissioning. The machine tool returns to normal.

CNC is short for Computer number control. The direct meaning is computer digital control, which is a processing technology widely used in the manufacturing industry at present. It can also be said that it is the symbol of the manufacturing industry now. CNC can easily realize multi axis linkage processing, such as surface processing. If you leave CNC and use an ordinary machine tool to process, it is almost impossible to complete. In addition, CNC can easily realize the flexible manufacturing system. In fact, it is not difficult to learn CNC. It can be said that as long as you can play with mobile phones, you can use CNC. However, before learning CNC, it is better to learn the processing principle of ordinary machine tools, as well as the basic mechanical manufacturing knowledge of drawing and tolerance, and then the effect will be good. To put it simply, ordinary machine tools are directly controlled by people to process, while CNC is controlled by people to process by controlling CNC system, so as to achieve more complex and high-speed processing. Numerical control processing refers to the processing in which the control system sends instructions to enable the cutter to make various movements that meet the requirements, and the technical requirements and processing technology requirements such as the shape and size of the workpiece are expressed in numbers and letters. It generally refers to the technological process of parts processing on CNC machine tools. CNC machine tool is a kind of machine tool controlled by a computer. The computer used to control the machine tool, whether it is a special computer or a general computer, is collectively referred to as CNC system. The motion and auxiliary action of the NC machine tool are controlled by the instructions issued by the NC system. The instructions of the NC system are compiled by the programmer according to the material of the workpiece, processing requirements, characteristics of the machine tool and the instruction format (NC language or symbol) specified by the system. The CNC system sends out operation or termination information to the servo device and other functional components according to program commands to control various movements of the machine tool. Machining center is a highly automatic multi-function CNC machine tool with tool magazine and automatic tool change device. After the workpiece is clamped on the machining center once, it can complete multiple processes on more than two surfaces, and has a variety of tool change or tool selection functions, thus greatly improving the production efficiency. Machining centers can be divided into boring and milling and turning according to their processing procedures, and can be divided into three axis, four axis and five axis machining centers according to the number of control axes.

The emergence of some processing methods, to our industry, the role of all aspects, are greatly improved, the performance of all aspects, is also very good, precision parts processing is the same, so the possibility and convenience of precision parts processing, the following by CNC precision parts processing I will tell you in detail. It is mainly the size data on the machining drawings of the parts should fit the programming convenient criterion   The conditions of the geometric elements forming the contour of the part should be sufficient   (1) The dimensioning method on the part drawing should conform to the characteristics of CNC machining. On the precision part machining drawing, the size should be quoted with the same reference or the coordinate size should be directly given.   1. This labeling method is not only convenient for programming, but also convenient for the mutual harmony between sizes. It brings great convenience in adhering to the divergence of design reference, process reference, detection reference and programming origin setting. 2. Because parts designers usually think more about assembly and other application characteristics in size labeling, they have to use local scattered labeling method, which will bring a lot of inconvenience to process layout and numerical control machining.   3. Due to the high machining accuracy and repeated positioning accuracy of precision parts, the application characteristics will not be damaged due to the large accumulation error. Therefore, the local decentralized labeling method can be changed to the labeling method of the same reference size or the coordinate size can be directly given.   (2) Base points or node coordinates should be calculated during manual programming. In the automatic programming, precision parts machining to constitute the outline of all geometric elements to stop the definition. Therefore, in the analysis of parts drawing, we should analyze whether the given conditions of geometric elements are sufficient.

For the rapid development of industry, many things, we have not known, for its information, we do not know, in the face of such a development of industry, we only know more about its information, precision machining is one of them, then precision machining production types are divided into what kinds? 1. Single production: single production of different structures and different scales of goods, and rarely repeated.   2. Mass production: The production of the same goods in batches throughout the year, the production process has certain repeatability.   3. Mass production: the production of a large number of goods, most of the work address is often repeated for a part of a process of processing.

With the continuous development of industry, we can know the rapid development of various industries, so when in use, it may cause some damage, it may be caused by us in use, it may be caused by processing, so how to prevent the damage of the mold, let the following CNC precision parts processing small make up to tell you. 1. Good casting structure design   The wall thickness of the casting should be as uniform as possible to avoid the generation of hot joints, so as to reduce the thermal fatigue caused by the local heat concentration of the mold. The corner of the casting should be properly rounded to avoid the stress caused by sharp corners on the mold.   2. Reasonable mold structure design   1) Each component in the mold should have enough stiffness and strength to withstand pressure without deformation. Mold wall thickness should be sufficient to reduce deformation.   2) The gating system is designed to minimize the impact and erosion on the core.   3) Correct selection of tolerance fit and surface roughness of each component.   4) Keep the mold heat balance. 3. Standardize heat treatment process   The microstructure of materials can be changed by heat treatment to ensure the necessary strength, hardness, dimensional stability at high temperature, thermal fatigue resistance and material machinability.   Only with the correct heat treatment process can the best die performance be obtained, while the steel performance is controlled by quenching temperature and time, cooling rate and tempering temperature.

In many factories now, there are a lot of finished products can not be used immediately, only after Dongguan precision machining can play a greater role. Today, I will give you a popularization of precision machining advantages. 1, multi-axis control linkage: Generally, three-axis linkage is the most used, but after some adjustment, it can be done to four axis, five axis, seven axis and even more axis processing center. 2, parallel machine tool: the function of the common processing center is relatively fixed, can put the processing center and turning center, or vertical, horizontal processing center together, which can add the processing scale and processing capacity of the processing center. 3, tool damage warning: the use of some skills detection techniques, can timely find the wear and damage of the tool, and alarm, so as to replace the tool in time, to ensure the quality of parts processing. 4, the service life of the tool management: can be a number of working together the tool and a number of blades on the same tool for consistent management, in order to improve the production power. 5, machine overload power maintenance: according to the load of the production process to set the maximum load degree, when the load reaches the set value, the machine can be automatically powered off and shut down, in order to implement the maintenance of the machine tool.

With the development of The Times more and more fast, all walks of life have accelerated the speed, precision machining is also smoothly squeezed into the market, that today Xiaobian today to give you the popularization of precision machining skills and tips. Trick one: Remove the jaws of the vise and process two M4 threaded holes. Then, two steel plates with a thickness of 1.5mm are flush with the jaws, and the hard brass plate with a thickness of 0.8mm are riveted with an aluminum counterhead and fastened to the jaws with M4 counterhead screws to form a durable soft jaws. This can also maintain hardware parts are not damaged by clamping, but also have interchangeability.   Trick two: Draw small parts with a magnet (fee) suction and take are inconvenient, can be in the magnet 1 below the suction of an iron plate 2, not only can absorb a lot of small pieces, and the iron plate will be pulled away, small pieces will immediately automatically pour into the collection box, lack to move the heart, but very applicable. Trick three: belt wheel drive, often between the pulley and the axle slip, in the axle with ￠15~18mm hole drill to scratch a series of holes, which can form the adsorption force, avoid slipping, turn waste into treasure, the boss will reward. Trick four: when the 1 handle of the hexagon wrench is short and can not be concentrated, the inner diameter of the tube is slightly larger than the wrench from a section of the milling groove to insert the wrench into the groove, which can be used as a long handle. Trick five: on the tightening of the workpiece has the first positioning and clamping, but about a workpiece, the first clamping and positioning, because the clamping will certainly try the deformation of the workpiece, so, should be the first clamping and positioning, about 6 points positioning, find the limit of its ease.