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

In industry, there are many different types of precision parts. Since the technologies involved in each industry are different, the parts employed and used are also very different. Due to the different shapes of the parts, in many cases they have to be machined in various ways to enhance its quality and related properties and functions. Today's CNC machining methods have been extended to a variety of manufacturing areas, with CNC precision parts machining being a common means of enhancing metal products. As the features of the technology continue to improve, its processing quality is gradually upgraded and transformed. The CNC precision parts machining method will also involve the die-casting process. The die casting process is the process of unifying pressure, speed and time using three main elements: machine, die and alloy. Used for metal thermal processing, the presence of pressure is the main feature of the die casting process that distinguishes it from other casting methods . Pressure casting is a special casting method with less cutting in the recent development of metalworking process. It is the molten metal in high pressure and high speed filling the casting, and in high pressure crystallization solidification to form the casting process. High pressure and high speed is the main feature of pressure casting. The commonly used pressure is tens of MPa, the filling speed (inner gate speed) is about 16 to 80 m/s, and the time for the metal liquid to fill the mold cavity is extremely short, about 0.01 to 0.2 seconds. Die-casting process is the die-casting machine, die-casting mold and alloy three elements of the organic combination and to be used in a comprehensive process. And die-casting when the metal according to the process of filling the cavity, is the pressure, speed, temperature and time and other process factors to get unified process. At the same time, these process factors and mutual influence, mutual constraints, and complement each other. Only the correct selection and adjustment of these factors, so that they are coordinated, in order to obtain the expected results. Therefore, in the die-casting process should not only pay attention to the casting structure of the craft, die-casting die advanced, die-casting machine performance and structural excellence, die-casting alloy selection of adaptability and melting process specification; should pay more attention to the pressure, temperature and time and other process parameters on the quality of the casting important role. In the die-casting process should pay attention to the effective control of these parameters.

Aluminum alloy is widely used because of its light weight, good heat dissipation, easy processing and excellent corrosion resistance. The shells of many commodities are made of aluminum alloy, and most aluminum alloy shells are made of aluminum alloy plates by secondary processing. In mass production, aluminum alloy shells are mainly processed by stamping. The aluminum alloy shell is particularly vulnerable to crushing and scratching during stamping production. Therefore, the following nine points should be noted in the process of die making and stamping of aluminum alloy shell: First, the aluminum alloy material is relatively soft, in order to prevent deformation and displacement of aluminum alloy during stamping. Precise positioning must be set on the stamping die, and the positioning device needs smooth surface without water chestnut. This can effectively reduce the defects caused by aluminum alloy shell stamping; Second, reasonably design the die clearance to prevent the aluminum alloy shell from bulging and corner collapse; Third, when designing the structure of aluminum alloy shell, try to avoid deep counterbore, because most of the post process of aluminum alloy shell requires anodic oxidation, and deep counterbore is easy to hide acid during anodic oxidation. Aluminum alloy shell Fourth, all the cutting edges of the die shall be cut with the slow threading line, because the cutting edges of the die cut by the fast and middle threading lines are uneven, and the cutting edges of the aluminum alloy shell are prone to burrs and dog teeth when punching; Fifth, when stamping the aluminum alloy shell, the aluminum alloy plate needs to be pasted with PE film. PE film can effectively reduce scratches and bruises; Sixth, during the production process, keep the mold, stamping platform and transfer blister disk clean and free of impurities; Aluminum alloy shell Seventh, aluminum alloy is a good conductor of heat, which is easy to conduct heat and heat. Therefore, it is necessary to coat drawing oil on materials and molds frequently to cool down during stamping, which can also play a role in lubrication; Eighth, during production, if the aluminum alloy shell has excessive burr or edge collapse, contact the mold department as soon as possible to repair the mold for production; Ninth, when stamping the aluminum alloy shell, the operator shall tear off the PE film every 20-30 times to check whether the aluminum alloy shell has any stamping defects, such as die printing, crushing, scratching, bulge, corner collapse, curling, etc.

In the precision machining, various tools are installed on the CNC knife, and the knife selection and the position of the knife are carried out strictly in accordance with the requirements at any time and anywhere, so it is necessary to choose the standard toolholder, which is convenient to make the standard tools for drilling, boring, expanding, cutting and other processes quickly and accurately installed on the spindle of the lathe or the CNC knife, and the software programmer should master the construction specifications of the common toolholder on the CNC lathe, the adjustment mode and its adjustment scope, so as to facilitate The axial and radial specifications of the tool are clear when the program is written. In China, the most common use is BT40 and BT50 series toolholders and spigots. Commonly used toolholders for precision machining centers: sharpening type toolholders, collet chuck toolholders, power chuck toolholders, face milling toolholders, triple-edge milling toolholders, flank type toolholders, Morse taper toolholders, drill chuck toolholders, tap chuck toolholders, and integral toolholders. No toolholder system software is foolproof. Toolholders designed for high speed precision machining processes generally lack the stiffness and compressive strength needed for high efficiency machining, such as rough machining of rough cast parts. Conversely, toolholders for rough machining typically lack the rotor balance that is needed to keep the toolholder stable at high speeds during deep machining processes. In addition, the robust design and large size of roughing toolholders may limit their ability to reach more detailed or deeper part features. Hard-to-process materials must have shanks with increased compressive strength and stiffness. In addition, the ability of the toolholder to work with shock absorption and its ability to work with cryogenic fluid transport are also key selection criteria. The application of unsuitable toolholders can cause specification deviations and part destruction, as well as excessive damage to the lathe spindle, reduced tool life and increased risk of tool breakage. In non-critical work, an inexpensive toolholder may result in a more satisfactory outcome. However, in processes where repeatable precision is essential, especially when the destruction of expensive product parts reduces the gross margin of the part, a project investment in a high quality toolholder with a focus on utilization can prevent such unexpected damage at a lower cost.

To know what are the requirements of precision parts processing, first, to know what is called precision parts processing, it is actually a kind of machining manufacturing, but more precise, the production of machinery and process requirements are higher, along with the development trend of modernization, precision machining categorization more and more, the orientation is more and more detailed, more and more systematic. Any piece of machinery and equipment is composed of many different small parts, each part plays a particularly important role. Parts must be assembled, so precision machinery parts processing manufacturers will be for that kind of requirements to carry out re-processing. After a variety of different parts processing we can get more suitable for their own parts, so in order to better be able to make this commodity can be better to their own service projects. Therefore, many people are exempt from the important link of precision machining. In order to better ensure the precision of precision parts machining, rough and fine mechanical parts machining is best carried out separately. Because of the rough mechanical parts processing, drilling volume, the product workpiece subject to cutting speed, clamping force, more thermal value, and its mechanical parts processing surface layer has a more obvious cold work hardening condition, the product workpiece internal there is a great deal of thermal stress. If the rough and fine mechanical parts processing continues, the depth of the machined parts accuracy will be due to the ground stress again all over and quickly missing. In the precision parts machining processing process pathway, often allocated with heat treatment process flow, heat treatment process flow parts of the following allocation: to improve the drilling and processing characteristics of metal materials, such as quenching, quenching, heat treatment, etc., generally allocated to carry out before mechanical parts processing. Precision parts processing process is very demanding, under the knife, out of the knife a ring, mastering the precision accuracy of the specifications, to be able to reduce the consumption of raw materials to control costs. For example, the positive and negative millimeter is how many μm, etc., if the wrong specifications will become scrap, the parts can not be used. In the process of the development of machinery and equipment manufacturing industry, people pay more and more attention to the quality of precision machinery manufacturing process. Therefore, the need to choose the relevant ways and means to carry out its solution, which makes precision mechanical parts processing accuracy to further improve. And along with the continuous development trend of scientific and technological progress, people will also be a lot of excellent scientific and technological progress to use in it. This makes people in the process of mechanical parts processing production, can get the quality of standard precision parts.

In preparation for a workpiece CNC precision parts processing how to go to select a suitable and accurate tool is a very important content, the second it not only endangers the production and processing of high efficiency, and also endanger the production and processing quality. The rapid development of CNC machining technology has prompted, design solutions, processing technology solutions, CNC programming to complete integration, the type of tool must also be integrated into the speed of CNC lathe, the efficiency of the high ground to work. Tools generally have: face milling cutters, end mills, round nose milling cutters, ball end mills type. Face milling cutter is mainly used in the three-dimensional milling machine to process the plane and small step surface, etc.. The key cutting part of the face milling cutter is on the round surface or round CNC lathe electrical equipment spherical surface. Manufacturing high efficiency; good rigidity, can choose a large cutting speed; in addition, there are several cutter teeth to participate in drilling, good reliability; adopt just set teeth structure, cutter teeth repair, removal and replacement of simple, long life. Face milling cutters are generally used for the production and processing of carbide tools raw materials. The end mill is the most common type of milling cutter in CNC precision parts processing, the appearance of the cylindrical surface are to the edge. Each edge is capable of drilling for the surface layer and producing independent machining. The key to plane cutting, groove cutting, step surface cutting and profiling cutting. It is generally used for machining raw materials such as stainless steel. Round nose milling cutter appearance design and end mill similar to the bottom end are designed to scheme into a thick bottom. Its characteristics are good stiffness, high wear resistance, high processing accuracy, short delivery time, common in the molding production processing. The general production and processing of mold steel, alloy steel, etc. Ball end mill tip part of the tip similar to the ball type in the CNC lathe is generally used to produce and process the workpiece bevel, arc, pipe groove. General precision parts processing used in the production and processing of carbon steel, alloy steel iron, etc. In the CNC lathe processing of each production processing workpiece must be produced and processed different parts and the total area of the pipe groove, etc., in order to produce and process to the precise level need to determine the production and processing of the raw materials must be used before the production and processing of which kind of tool to produce and process.

Some problems are often encountered in the numerical control lathe processing of aluminum alloy shells. The appearance of problems means that the products are defective, and solutions need to be found quickly. Based on our years of experience in CNC lathe processing, we summarize common problems and solutions in aluminum shell lathe processing, which can be a reference for everyone when problems occur. The processing arc effect is not ideal, and the size is not in place. Cause of the problem: resonance is caused by overlapping vibration frequencies; Unreasonable parameter setting and excessive feed speed make arc machining out of step; Looseness caused by large lead screw clearance or out of step caused by too tight lead screw, and wear of synchronous belt. Solution: find out the parts that generate resonance, change their frequency, and avoid resonance; Considering the processing technology of the workpiece material, reasonably prepare the program; For stepping motor, the processing speed F cannot be set too large; Whether the machine tool is firmly installed and stably placed, whether the carriage is too tight after wear, whether the clearance increases or whether the tool holder is loose; Replace the timing belt. Aluminum alloy shell car parts  In the mass production of aluminum car parts, the workpiece is out of tolerance occasionally. Cause of problem points: the tooling must be carefully checked, and the operator's operation method and the reliability of clamping must be considered. Due to the size change caused by clamping, the tooling must be improved so that the workers can avoid making mistakes due to human negligence as much as possible; The CNC system may automatically generate interference pulse after being subject to fluctuation or interference of external power supply, which will be transmitted to the driver to cause the driver to accept the redundant pulse and drive the motor to take away or less. Solution: Understand and master the rules, and try to adopt some anti-interference measures, such as: the strong current cable interfered by strong electric field is isolated from the signal line of weak current signal, the anti-interference absorption capacitor is added and the shielded wire is used for isolation. In addition, check whether the ground wire is firmly connected, the grounding contact is nearest, and take all anti-interference measures to avoid interference to the system. There are increasing or decreasing phenomena in each process of aluminum shell car parts Cause of problem point: programming error; The system parameters are set unreasonably; Improper configuration settings; The mechanical transmission components have regular periodic change faults. Solution: Check whether the instructions used in the program are executed according to the requirements of the instructions. You can judge by playing a dial indicator. Position the dial indicator at the starting point of the program to see whether the carriage returns to the starting point after the program ends. Repeat the execution even if the results are observed, and grasp the rules; Check whether the system parameters are set reasonably or are considered to be changed; Whether the single calculation on the coupling parameters of the connection calculation of the relevant machine tool configuration meets the requirements, and whether the pulse equivalent is accurate; Check whether the transmission part of the machine tool is damaged, whether the gear coupling is uniform, and whether there are periodic and regular faults. If yes, check the key parts and eliminate them.

Non-standard parts processing is usually the usual machining process of turning, milling, planing, grinding, pincer, etc., the milling process of opening, scribing, opening holes, tapping, etc. The symbolic fields are airlines, aerospace industry chain, ship industry chain, construction and engineering machinery industry chain, CNC lathe industry chain, etc. The typicality of a lot of volume production means for the automobile industry, and the mold industry chain of the new models and hair ideas of the automobile industry and other R&D and key for a lot of volume production service items are still classified as separate small volume production.   The advantages of non-standard parts processing of small batch production may well save the cost of years, raw material costs, to speed up the cycle time of the material into the market. Small batch production is closely linked to the hand-plate model template, which is the standard for small non-standard parts processing, and small non-standard parts processing is pioneered in most of the hand-plate model template. Non-standard parts processing is suitable for a large number of, high-precision, production and processing of complicated, the production and processing of arc, finish, etc. especially in can serve. The advantages of non-standard parts processing of small non-standard parts processing from single-digit to three-digit varies, is based on the simple mold, soft mold, or immediate production and processing out.

Precision machining is the process of changing the size or characteristics of a workpiece by a mechanical device. It can be divided into drilling processing and work pressure processing according to the difference in processing methods. The production process of equipment refers to all processes from raw materials (or semi-finished products) into goods. In terms of equipment manufacturing, it includes delivery and storage of raw materials, advance preparation for manufacturing, manufacturing of blanks, processing and heat treatment of parts, installation and adjustment of goods, paint and packaging, etc. Today's field of gauges can detect the commodity data, most of them are not comprehensive, it is a certain reason, the current gauges have certain limitations, resulting in a part of the commodity data can not be detected and reflected out, not knowing that this causes, we process the high efficiency and accuracy, and thus endanger the basic characteristics of the goods and applications. So usually must be other auxiliary software to measure, it is now we should improve the area, and then grasp all the technical data of the goods, then we will follow the mechanical parts processing efficiency will be enhanced, but now we apply auxiliary software will expand the product cost and enhance the production and manufacturing time, with a certain inconvenience. It is a kind of inspection gauge, which can detect the customer's necessary drawing requirements, and is used to test and solve the data of the workpiece. Nowadays, we talk about how to properly apply inspection gauges, and our testing tools are divided into measurement during precision machining and quality inspection measurement. Measurement during machining is a key, because the target of its application is the operator, for the application of testing gauges such as vernier calipers need to be extra careful. Mechanical processing, such as the need to measure whether a workpiece to achieve the step accuracy requirements, need to wait for the workpiece to stop completely after the measurement, to prevent the workpiece vibration damage to the measuring surface of the inspection gage. Generally professional staff is the actual operation, for the application of the gage is not necessary to describe too much.

Surface roughness of machined mechanical spare parts is an important technical indicator reflecting the error of micro-geometric appearance of the surface layer of mechanical spare parts, which is the main basis for checking the quality of the surface layer of the parts and is immediately associated with the quality of goods, service life and product cost. There are three ways to select the surface roughness of mechanical parts, i.e. calculation method, testing method and analogical method.   A common application in the design of mechanical parts processing is the analogical approach, which is simple, fast and reasonable. The application of derivation must be well referenced and a wide variety of current mechanical construction design guides give a large amount of material and references. Commonly, surface roughness is compatible with dimensional tolerance levels. In general, the smaller the standard tolerances of mechanical parts are specified, the smaller the value of surface roughness of mechanical parts, but there is no fixed functional relationship between them. Mechanical parts processing strength is the ability of the parts in the work without rupture or plastic deformation beyond the permissible degree, it is the most basic provisions of all normal operation and production safety of the equipment. The standard countermeasures to improve the strength of the parts are: ① expand the specifications of the risk profile of the parts, effectively design the profile to expand the moment of inertia of the profile; ② choose high-strength raw materials, heat treatment process to improve the strength of raw materials and reduce thermal stress, manipulate the production process to reduce or remove microscopic shortcomings; ③ ensure that the load on the parts is reduced; ④ properly involve the structure of the parts to reduce the stress level, etc.

Precision machining is the process of changing the size or performance of a product workpiece according to the equipment. Depending on the temperature of the workpiece, it is divided into cold drawing and heat treatment. Generally, machining processes that are carried out at room temperature and do not easily cause chemical reactions in the product workpiece are called cold drawing. Generally speaking, the machining process which is higher or significantly lower than the normal temperature and which causes chemical reaction of the product workpiece is called heat treatment. Cold drawing can be carried out according to different mechanical processing and manufacturing methods. It is used for drilling and working pressure processing. Heat treatment is commonly used in heat treatment processes, forging, forging and welding by electric welding. The production process of precision machining is the whole process of producing and manufacturing goods from raw materials (or semi-finished products processing). It is used for machining manufacturing production manufacturing, including the delivery and storage of raw materials, production site management, preliminary processing, parts processing and heat treatment process, commodity installation and conditioning, painting and packaging. 1, from the hardware point of view, mechanical parts processing is based on a variety of mechanical equipment, such as vehicles, CNC lathes, drilling machines, CNC grinding machines, broaching, CNC machining centers to carry out processing manufacturing, a variety of machinery and equipment original processing precision is not the same, so to achieve a certain degree of precision, when carrying out processing, it is necessary to select the appropriate mechanical processing manufacturing process and mechanical processing manufacturing Machinery and equipment.   2, in terms of software, it is a technical operator, it involves a variety of machine and equipment operator's professional skills. This professional skills include in-depth understanding of machinery and equipment, understanding of machining manufacturing, and its parts and raw materials, etc. This professional skills can be gradually accumulated in the usual work.