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

First, before the machine works, check whether the moving parts are filled with lubricant, then start to check whether the clutch and brake are normal, idle the machine for 1-3 minutes, the machine is strictly prohibited to operate when there is a fault.   Second, in the work to maintain the correct posture, have enough energy to cope with the work; if found unwell, should immediately leave, and report to the leadership; operation must focus on the mind, chat, cooperate with each other; operators must not operate in a state of irritability, fatigue, to avoid accidents, to ensure operational safety. Before entering the workplace, all employees should check whether their dress code meets the work requirements. Flip-flops, high heels and clothes that affect safety are not allowed, and helmets must be worn for long hair. Third, when replacing the die, first turn off the power and wait until the moving part of the press stops running before installing and debugging the die; after installation and adjustment, move the flywheel by hand for two test punches to check whether the upper and lower dies are symmetrical and reasonable, whether the screws are firm and whether the crimp circle is in a reasonable position.   Fourth, you need to wait for all other personnel to leave the machine work area, clear the debris on the workbench before starting the power to start the machinery. Fifth. When the machine is working, it is strictly forbidden to reach into the working area of the slider and to pick and place workpieces by hand. When picking and placing workpieces in the mold, standard tools must be used. If any abnormal sound or fault is found in the machine, the power switch should be turned off immediately for inspection. After the machine is started, one person carries the material and operates the machine. Others must not press the electrical floor or foot switch plate, let alone put their hands on the working area of the machine or touch the moving parts of the machine with their hands.   Sixth, at the end of the day, the power should be turned off idle, and tidy up the finished products, trimmings and debris on the post to ensure a clean and safe working environment.

What are the methods of precision parts machining to obtain dimensional accuracy? Precision mechanical parts processing process affects the processing accuracy of many factors, different processing methods in different processing conditions can achieve different accuracy; if the pursuit of processing accuracy, will reduce production efficiency and increase the cost of precision mechanical parts processing. Therefore, precision machining enterprises should try to achieve the purpose of improving efficiency and reducing production costs under the premise of ensuring quality. The machining accuracy of precision mechanical parts can be divided into dimensional accuracy, shape accuracy and position accuracy. Therefore, the level of machining accuracy is measured by dimensional tolerance, shape tolerance and position tolerance. The method of obtaining the dimensional accuracy of the parts: test cutting method: first test cut a small part of the machined surface, measure the size of the test cut, adjust the position of the cutting edge of the tool relative to the workpiece according to the processing requirements, then test cut and measure again, after two or three test cuts and measurements, when the precision machining dimensions meet the requirements, and then cut the entire surface to be machined. Precision mechanical parts processing journal size trial cutting turning, journal size online measurement and grinding, box parts hole system trial boring processing, precision measuring block manual fine grinding, etc., all through the trial machining shear method.   The accuracy achieved by the trial cut method may be very high. It does not require complex equipment, but it is time-consuming and requires several adjustments, test cuts, measurements and calculations. The efficiency is low, depending on the technical water symptoms of workers and the accuracy of measuring instruments; the quality is unstable and only used for single-piece small batch production.   Adjustment method is to adjust the accurate relative position of machine tools, fixtures, tools and workpieces with sample or standard parts in advance to ensure the dimensional accuracy of precision mechanical parts processing, and the dimensions remain unchanged during the processing of a batch of parts... This is the adjustment method. Machining shaft parts on a multi-tool lathe or hexagonal automatic lathe, machining grooves on a milling machine, grinding external circles and hole systems on a centerless grinder are all adjustment methods. If you use the milling machine fixture, the position of the tool is determined by the tool holder; the essence of the adjustment method is to use the fixed distance device or tool setting device on the machine tool or pre-set tool holder, so that the tool reaches a certain position relative to the machine tool or fixture. Accuracy, processing another batch of workpieces. In mass production, the tool setting device is often adjusted using the travel limiter, sample machine, prototype, etc. The adjustment method has better machining accuracy and stability and higher production efficiency than the test cutting method. It does not require high requirements for machine tool operation, but high requirements for machine tool adjustment. It is commonly used in mass production and mass production.   Fixed-size method: precision parts processing using the corresponding size of the tool to ensure that the workpiece processing part of the size of the method is called fixed-size method, that is, the use of standard size tools for processing, precision machining surface size by the following formula to determine the size of the tool; that is, the use of a certain size accuracy of the tool to ensure the accuracy of the workpiece being processed. For example, using a square broach to pull out a square hole, using a drill, reamer, reamer or boring block to process the inner hole, using a combination of milling cutters on both sides of the workpiece to mill a groove, etc., are all part of the sizing tool method.

Generally speaking, the process route is the entire processing route that the entire part processing needs to go through from the blank to the finished product, and the development of the process route is an important part of the precision machining process. The main task is to determine the number of processes and process content, select the processing method for each surface of the part, and determine the order of precision parts processing for each surface.   The main difference between CNC machining and ordinary machine tool process route design is that the former is not the entire process from the blank to the finished product, but the specific description of several CNC machining processes. In the CNC precision machining, CNC machining process is generally throughout the whole process of parts processing, so it needs to be well connected with other processing processes, which is what we should pay attention to in the process design. According to the characteristics of cnc precision parts processing, CNC machining process can be divided according to the following methods.   First, one installation and one processing as one process. The method is applicable to the parts with less processing content, and can reach the state of pending inspection after processing.   Second, the process is divided according to the processing content of the same tool. Although the surface of some precision parts can be completed in the middle of one installation, but considering the program is too long, it will be limited by some memory and continuous working time of the machine tool, for example, if a process can not be completed within one working time and the program is too long, which will increase the difficulty of error and retrieval. Therefore, among the cnc precision parts processing, the prepared process should not be too long, and each process should not have too much content.   Third, according to the processing parts to divide the process; for the workpiece being processed more content, processing parts can be divided into several parts according to their structural characteristics, such as cavities, shapes, surfaces or planes, etc., each part of the processing can be considered a process.   Fourth, divided into roughing and finishing; certain materials precision parts processing process is easy to deformation, so it is necessary to calibrate the deformation that may arise after roughing. Generally speaking, roughing and finishing processes should be separated; sequential arrangement should be considered according to the structure and blank of the part, as well as the need for positioning, mounting and clamping. Sequential arrangement should generally be carried out according to the following principles. The processing of the upper process should not affect the positioning and clamping of the next process, and should be integrated with ordinary machine tools interspersed with the processing process: 1.   1. first processing the inner cavity, and then processing the shape.   2. preferably under the same positioning, clamping mode or use the same tool continuous processing, in order to reduce the number of tool changes for heavy-duty positioning.   3. At the same time, the principle of precision parts machining order arrangement is: first fine then fine, first main then secondary, first face then hole, benchmark first.

How to choose the rough and precise datum for precision mechanical parts machining? People engaged in mechanical parts processing know that the positioning datum must be selected from the beginning to the end of processing. Then what is the positioning datum? It is the surface used to determine the relative position of the workpiece with respect to the machine tool and the tool. The datum used at the beginning is unprocessed and is called the rough datum. The positioning datum used in subsequent machining is the machined surface, which we call the fine datum. How to choose which plane as a reference is a very important issue in the process design of precision mechanical parts. Whether the positioning datum is reasonable will directly affect the processing quality of precision parts and the complexity of the machine tool fixture structure. However, due to the different functions of precision benchmark and precision benchmark, their selection principles are also different.   Rough datum selection principles: first, to ensure that each machining surface has sufficient margin, second, to ensure that the size and location of the non-machined surface in line with the requirements of the drawings; the choice of rough datum should be easy to position the part, clamping and processing, and make the fixture structure as simple as possible. If the workpiece is first to ensure the position accuracy requirements between the machined and non-machined surfaces, the non-machined surface should be used as the rough datum. In order to ensure that the roughing allowance of the important surface is small and uniform, the surface should be selected as the roughing datum. To ensure that the roughing allowance of the important surface of the base is small and uniform, the surface should be selected as the roughing datum. In order to make the machining allowance of multiple precision machining surfaces above the blank more uniform, the surface of the blank that will have the same position error as the selected rough datum can be selected as the rough datum. Rough datum surface should be flat, no gating, riser, flying edge and other defects to ensure reliable positioning, the general rough datum can only be used once, especially the main positioning datum, in order to avoid large positional errors. Fine benchmark selection principles: the selection of positioning benchmark should be easy to position, clamping and processing, and has sufficient positioning accuracy; according to the principle of unified benchmark, when the workpiece with a set of more easily processed most of the remaining surface of the fine benchmark positioning, in the precision parts processing these surfaces in each process, should use the same set of benchmarks for positioning, in order to reduce the tooling design and manufacturing, to avoid benchmark conversion errors, improve Productivity. Benchmark overlap principle. When the processing surface of precision mechanical parts ultimately need to ensure the position accuracy, the design reference should be selected as the positioning reference for positioning. In the finishing process according to the principle of unity of the benchmark positioning but can not guarantee the positioning accuracy of the surface, must use the principle of benchmark overlap and the principle of self-referencing. When some surface finishing process requires a small and uniform margin, the processing surface itself can be used as a positioning reference. At this time, the position accuracy requirement is guaranteed by the prior process.

In how to improve the motion performance of the guide rail in the machining of precision mechanical parts? In the processing of precision mechanical parts, in order to improve the motion performance of the air-bearing guide, the following three methods can be used; firstly, the rigidity of the loading direction of the rail is improved. The design of the guideway structure uses a closed guideway. This can improve twice the rigidity than single side. Reduce the air uplift gap; In addition, it is necessary to increase the strength of the closed, stable air supply, clean air supply and reduce the possible vibration factor. In the air supply circuit, design the load compensation mechanism and automatic pressure regulating device to reduce the change of air float gap, and control the air float gap with pressure spring and roller; or reasonably configure the air cushion to make it automatically balanced, relative to the high precision detector, the air float precision must be within 0.001-0.002mm.   Secondly, it can improve the attenuation force when the guide moves, the more air cushion holes, the greater the damping force and the greater the rigidity. If the use of powder cure porous material as the air cushion, with a large area of fine holes instead of small holes to narrow the air cushion, then the damping force will be even greater. As long as the precision machinery parts allow processing, you can use gas-liquid two-phase lubrication, due to the existence of oil film on the contact surface of the guide and increase the damping force. In addition, you can also use the structure of the semi-suspension guide form, the coordinate machine is a combination of suspension rail and mechanical rail form, using the advantages of the motion characteristics of the two rails, not only to improve the resistance to end-motion, but also to maintain a constant gap between the suspension rail, improve the damping force of the guide motion, improve the motion performance of the guide.   Usually, precision mechanical parts processing, machine tools are not suitable for working in dirty and high temperature and humidity, the power supply environment of the power grid also has high requirements, the machine tool supply voltage must be below 10%, three corresponding balance and stability. Harsh power grid must be retrofitted with a regulated power supply, machine tools in addition to maintaining normal cleaning and lubrication, but also must be carefully maintained its various components.

What factors are inseparable from the quality of non-standard precision parts machining? Quality control of precision parts processing process is the focus of quality control and management of auto parts processing; quality control and management of this process will directly affect the processing tolerance of the parts. In the process of precision mechanical parts processing, companies should allocate processing machines according to roughing and finishing. In precision machining, people are the first element that affects the processing quality; in the quality control of auto parts processing, the processing and training of technical personnel should be strengthened to improve the technical level of precision mechanical parts processing, so as to improve the processing quality of auto parts; Ruifeng Xinye has a perfect training system to regularly carry out technical training for the front-line personnel in production and processing to promote quality control work.   The advantage of this is that on the one hand, through the separation of roughing and finishing, the raw and skilled hands are separated; the use of experienced precision machining personnel for finishing can reduce the tolerance of the parts and improve the machining quality of auto parts; on the other hand, the separation of fine machining can also effectively use the company's existing machine tools to replace old machine tools or rough machining of machines with large errors, reducing the machine tool factor on the quality of auto Parts processing quality of the impact of precision machine tools or commissioning after the state of good machine tools to reduce precision machining errors and improve the quality of parts. The above operation parts processing methods, not only can effectively improve the processing efficiency and quality of precision mechanical parts, but also can extend the service life of processing enterprises equipment, improve precision parts processing accuracy, but also help control costs. Most automotive parts use surface treatment to improve their wear resistance; precision mechanical parts processing enterprises should also improve the quality control of the surface treatment process. Through the choice of surface treatment process, scientific testing to improve the quality of surface treatment, to achieve quality control of parts processing.

The precision parts processing equipment is an electrified automatic cabinet that can realize the switching control of the motor through the matching control. This equipment has functions such as overload, short circuit and defect protection, and is very compact, stable in operation and fully functional. It can also be combined according to the size of the actual control scale, and can realize individual equipment automation control or multiple equipment. Just constitute a centralized control system through industrial Ethernet or industrial bus network. Now many electrification production using this equipment is because this equipment can adapt to various sizes of industrialized control occasions. Industry insiders said that some domestic manufacturers of precision parts processing equipment can ensure basically the same functions as those produced by foreign groups, complete equipment automation and process automation, control the realization of the perfect network function. In addition, the domestic imitation equipment machine performance is also quite stable and scalable, anti-interference ability is also particularly strong, can be said to be the heart and soul of modern industrial production in China. And it is important to know that some domestic manufacturers produce imitation equipment, designed according to domestic production needs, and ride on the human-machine interface touch screen, so that it can be more easily operated. Some people may not know what the specific composition of precision parts processing equipment are often know this equipment products in the current domestic electrification production industry is more common, in fact, for the domestic production of this equipment products, the main composition is to have an air switch. This air switch is the entire power control part of the equipment is also an important part of each equipment product must be equipped in addition, about the equipment, in most cases comes with a twenty-four volt power supply, whether or not the need for this power supply is based on the actual situation to decide. In addition, in general, the equipment is able to send the command directly back to the control circuit, there may also be first essential oil relay, and then transit, to know the command issued when the relay action to allow the control circuit relay normally open or normally closed is required according to the actual situation to be developed, so for many equipment production, customers should confirm with the manufacturer, according to the actual situation before the production of equipment products.

The preparation of precision parts machining process in the process of all mechanical parts processing, the preparation should be a comprehensive and in-depth study of the processing drawings, and according to the processing requirements of the precision parts marked on the drawings for comprehensive force analysis and related analysis, confirm the accuracy, communicate with the customer the strength and performance requirements of the parts to ensure the correctness of the precision parts machining process preparation. By analyzing the performance of different parts, different processing difficulties and processing details are determined. If the customer has other special requirements, they also need to be considered comprehensively, and if there are technical parameters that cannot be met, they must be communicated with the customer in a timely manner. After completing this step, the next step is to design the corresponding processing sequence and process according to the drawing, standardize the processing process and standard, while simulating the processing, and on this basis, determine the processing process and standardized operation standard of precision mechanical parts.   Because the precision machining process can have a variety of process flow schemes, before preparation, the designer should make appropriate configurations based on mastering all the processing methods. The principle is to ensure that high-performance products are obtained in an energy-efficient manner during processing, and to elaborate considerations between different processing types to ensure the safety and efficiency of the precision part processing process. The realization of precision parts processing technology is based on the cooperation of equipment and technical operators, therefore, in the processing process chart, the goal should be to be highly operable, to implement a collaborative model of equipment and personnel, to allow professional operators to carry out professional operations, to further improve the productivity of the processing process, and to do a good job of performance management between the processing quantity and operators to ensure the effective realization of the preparation of precision mechanical parts processing process .

What are the factors that affect the accuracy of precision machining of mechanical parts? The manufacturer's production is related to machinery and equipment, with the help of machines, our workload, results and speed are much faster; despite the help of machinery and equipment, the customer's demand for quality is so high; of course, the processing process is also very high precision requirements, such as the processing of precision mechanical parts. When machining precision mechanical parts, digital program-controlled contouring systems are widely used on milling machines, including phase systems with extensive machining capabilities, simplicity, reliability and low cost; these systems are used in many factories, especially for controlling the machining of precision mechanical parts with large three-dimensional profiles.   The correct preparation of control programs is one of the main conditions for the quality of precision mechanical parts machining. For digital program control phase systems, the preparation of control programs is carried out by automatic programming systems, the level of quality of which depends to a large extent on the price of preparing control programs.   Others are the processing errors caused by manual control equipment, these errors include accidental errors in the process system and system errors; all processing errors in the system errors play a major role, for precision mechanical parts processing as a whole, will cause a series of CNC process system errors. For example, the role of the gap and the machine tool drive chain in the same insensitive belt, but does not include the reverse drive chain gap; the amplification factor of the unstable drive; the phase error on the control program tape; the sensor feedback of the periodic step is not stability, its main form is the phase form of instability.

What are the requirements for ultra-hard abrasive grinding for precision parts machining? In fact, superabrasive grinding wheels in precision parts machining put forward some requirements for grinding machines, and it is best to grind on superabrasive grinding wheel grinders. The requirements of superhard abrasive grinding wheel for grinding machines include the following aspects. 1、The grinding machine should have high precision. The radial circular runout should be