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

With the deepening of social construction in China, sheet metal parts are gradually applied in people's lives. In general, sheet metal processing is a process of cold working with sheet metal to obtain sheet metal parts that meet the application requirements. Generally, sheet metal parts have obvious advantages in strength, weight and cost, and have better point-to-point performance compared with traditional parts. Therefore, up to now, sheet metal parts have been gradually applied in high-tech fields such as electronics and communications in China, At the same time, people have gradually put forward higher requirements for the quality and function of sheet metal parts. Therefore, appropriate optimization of the original sheet metal processing technology has become the focus of the research of sheet metal processing personnel. According to the actual research, this paper believes that the optimization of the processing technology should be carried out one by one from the application of the four basic cold processing links in the sheet metal processing. 1 Blanking link First of all, as far as the blanking link is concerned, blanking usually refers to the separation of sheet metal materials through the stamping of the die, which results in the separation of sheet metal materials from each other. This link is usually applied to the processing of parts with relatively simple shapes, so as to achieve a high degree of precision in processing shapes and reduce the waste of materials at the same time. In this link, first of all, the shape of the blanking sheet metal parts should be controlled. In the corner area of the outer and inner holes of the blanking, an arc should be set for excessive corner to avoid sharp angles and reduce the problem of die cracking caused by improper subsequent heat treatment, which affects subsequent sheet metal construction; Then, the punching and its minimum value should be optimized. Generally, when punching a sheet metal part, if the punching size of the blanking sheet metal part is small, the load on the punch will be reduced to a large extent. However, if it is too small, it is easy to cause the data of the pressure borne by the mold to become more sudden, which will affect the quality of the actual mold. For example, in this link, the punching of sheet metal parts should be set according to different load targets of sheet metal parts. In the basic state, the length of the hole diameter should be more than twice the hole spacing and more than 3.00 mm. Finally, the cantilever and groove settings on the blanking parts should avoid being too narrow or too long in the actual process application link, so as to improve the strength of the relevant die edge and control the notch width of the cantilever to be greater than 200 sheet metal thickness. 2 Bending link Bending link usually refers to the process of preventing sheet metal materials on the bending equipment, causing elastic deformation of sheet metal materials through the pressure of upper mold or lower mold, and plastic deformation according to the actual design scheme after elastic deformation. In the application process of this link, different parts should be selected according to the actual design requirements, and the actual operation of bending should be determined according to the thickness of sheet metal materials. According to the actual bending experience, local abnormal deformation is most likely to occur in the bending link, which will affect the appearance quality and actual application of the sheet metal parts. Therefore, in the actual operation link, if you want to optimize the process for the bending link, the operator should make a pre cut according to the actual situation, so as to avoid the problem of subsequent deformation. At the same time, when the parts need to be bent for many times, a comprehensive prediction should be made for all the bending operations to avoid the influence of the first bending operation on the subsequent bending process, so as to achieve the expected design goal of sheet metal parts. 3 Riveting link The riveting process of sheet metal parts refers to the process of deforming sheet metal materials through the action of pressure and then coupling them together. This process is usually applied to screw riveting, bolt riveting and other processes. As for the closing riveting process, usually the nut is round and has a section of embossed gear and wire notch. Therefore, the riveting process for sheet metal parts not only optimizes the quality of the original nut production process, but also avoids the welding process. If you want to get a better design scheme, first of all, you can select different specifications of molds according to the height of different pressing bolts in the actual pressing and riveting link, and adjust the pressure release of the pressing and riveting device, so as to ensure the pressing quality of the nuts and avoid the problem of waste parts. Secondly, the appropriate sheet metal size can be selected at the link set by the press rivet structure, so as to ensure the press rivet result and avoid the release of the press link of sheet metal parts. 4 Welding link Welding link is one of the important ways to connect all parts of the structure together in the cold work link in the whole process of sheet metal processing. Therefore, this link is usually placed under the background of high temperature for operation. At present, most common welding methods are argon arc welding and contact spot welding.

Problem 1: The bending edge is not straight and the size is unstable reason: 1. The design process does not arrange pressing or pre bending 2. Insufficient material pressing force 3. Asymmetrical wear of round corners of male and female dies or uneven bending force 4. The height is too small terms of settlement: 1. Design line pressing or pre bending process 2. Increase the pressing force 3. The clearance between male and female dies is even, and the fillets are polished 4. The height dimension cannot be less than the minimum limit dimension Problem 2: The outer surface of the workpiece is scratched after bending reason: 1. Raw material surface is not smooth 2. The bending radius of punch is too small 3. The bending clearance is too small terms of settlement: 1. Improve the smoothness of punch and die 2. Increase the bending radius of punch 3. Adjust bending clearance Problem 3: There are cracks in the bending angle reason: 1. The inner radius of bending is too small 2. Material grain direction is parallel to bending curve 3. The burr side of the blank is outward 4. Poor plasticity of metal terms of settlement: 1. Increase the bending radius of punch 2. Change blanking layout 3. The burr shall be changed to the internal fillet of the workpiece 4. Annealed or made of soft material Problem 4: Hole deformation caused by bending reason: When bending by elastic pressure and positioning by holes, the outer side of the bending arm is pulled due to friction between the surface of the die and the outer surface of the workpiece, which makes the positioning hole deformed. terms of settlement: 1. Adopt shape bending 2. Increase the pressure of ejector plate 3. Add pitting grid on the ejector plate to increase friction and prevent the parts from slipping during bending Problem 5: The extruded material on the curved surface becomes thinner reason: 1. Die fillet too small 2. Too small clearance between punch and die terms of settlement: 1. Increase the fillet radius of the die 2. Correction of punch and die clearance Problem 6: The end face of the part bulges or is uneven reason: 1. When bending, the outer surface of the material is pulled in the circumferential direction to produce shrinkage deformation, and the inner surface is pressed in the circumferential direction to produce elongation deformation, so the end face of the material is flexed along the bending direction to produce bulge. terms of settlement: 1. The punch and die of parts shall have enough pressure at the last stage of stamping 2. Make the fillet radius of the die corresponding to the fillet of the part 3. Add procedures to improve Problem 7: The bottom of concave part is uneven reason: 1. The material itself is uneven 2. Small contact area between top plate and material or insufficient jacking force 3. No ejector in the die terms of settlement: 1. Leveling material 2. Adjust the jacking device to increase the jacking force 3. Add jacking device or correct 4. Adding and shaping process Problem 8: The axis centers of the two opposite holes on both sides are shifted after bending reason: Material springback changes the bending angle to make the centerline shift terms of settlement: 1. Add correction procedure 2. Improving the Structure of Bending Die to Reduce Material Rebound Problem 9: The accuracy of hole position and size cannot be guaranteed after bending reason: 1. Unfolding size of parts is incorrect 2. Caused by material rebound 3. Unstable positioning terms of settlement: 1. Accurately calculate the blank size 2. Add correction process or improve bending die forming structure 3. Change process processing method or add process positioning Problem 10: The bending curve is not parallel to the center line of the two holes reason: Torsion and deflection due to inconsistent drawing and shrinkage in the width direction of the workpiece terms of settlement: 1. Increase bending pressure 2. Add correction procedure 3. Ensure that there is a certain angle between the material grain direction and the bending direction Problem 11: After bending, the width direction is deformed, and the bent part has bow deflection in the width direction reason: Torsion and deflection due to inconsistent drawing and shrinkage in the width direction of the workpiece terms of settlement: 1. Increase bending pressure 2. Add correction procedure 3. Ensure that there is a certain angle between the material grain direction and the bending direction Question 12: The part with notch flexes downward reason: The notch makes the two straight edges open to the left and right, causing deflection at the bottom of the part terms of settlement: 1. Improve product structure 2. Increase the process allowance at the notch to connect the notches, and then cut off the process allowance after bending

The division of NC machining processes can generally be done in several ways. (1) The centralized tool sorting method is to divide the process by the tool used, using the same tool to machine all the parts that can be done on the part. A second tool is used and a third tool is used to do the rest. This reduces the number of tool changes, compresses idle time, and reduces unnecessary positioning errors. (2) Sorting method by machining parts For parts with more machining content, the machining parts can be divided into several parts according to their structural characteristics, such as internal shape, external shape, surface or plane. In general, the plane and first processing the positioning surface, and then processing the hole; first processing simple geometry, and then processing complex geometry; first processing the lower precision parts, and then processing the parts with higher precision requirements.   (3) Roughing and finishing sequence method is prone to machining deformation of the parts, and since deformation may occur after roughing, shape correction is required, so in general, roughing and finishing should be processed separately. . . In summary, when dividing the process, the structure and process of the part, the function of the CNC machining center machine, the number of parts CNC machining content, the number of installations and production organization should be flexible. That unit. It is also recommended to use the principle of process concentration or process decentralization, which should be determined according to the actual situation, but must be reasonable.

What is the order of precision parts processing? For the processing industry, the order is very important, it is related to the quality assurance of the product, if an order is wrong, it is easy to cause great losses. , precision machining is one of them, so what is the order of it? 1, precision machining order should be arranged according to the structure of the part and the blank, as well as the positioning and clamping needs to be considered. The key is not to destroy the rigidity of the workpiece. (1) the processing of the previous process can not affect the positioning and clamping of the next process, interspersed with the general precision machining process should also be considered comprehensively. (2) The internal shape and cavity processing process should be carried out first, and then the shape processing process. (3) It is best to use the same positioning and clamping method or the same tool processing process to reduce the number of repeated positioning, the number of tool changes and the number of times to move the table.   (4) Multiple processes carried out in the same device should be prioritized for processes with less rigid damage to the workpiece. Precision parts processing Second, the tool concentration sorting method is to divide the process by the tool used, using the same tool to process all the parts that can be completed on the part. Use the second tool, the third tool to do the rest. This can reduce the number of tool changes, compress the idle time and reduce unnecessary positioning errors. 3. Using the machining part sequence method For parts with more machining content, the machined part can be divided into several parts according to its structural characteristics, such as internal shape, external shape, surface or plane. In general, the first processing plane and positioning surface, and then processing holes; first processing simple geometry, and then processing complex geometry; first processing lower precision parts, and then processing higher precision parts. The above is the sequence of precision parts machining. Be sure to follow these steps, which will greatly reduce your processing risk.

A roller is a cylindrical rotatable object in machinery and equipment. A common power device in machinery and equipment (such as a motor) drives the roller to push other raw materials forward, or uses the roller to generate working pressure to process raw materials. What are the requirements for the production of rollers for precision hardware parts processing? 1、The roller should have sufficient stiffness to ensure that the bending deformation under light load does not exceed the allowable value.   2、The roller surface needs to have sufficient strength, generally above HRC50 degrees, and strong corrosion resistance. The coating has the ability to resist peeling to ensure that the roller surface has good wear resistance and corrosion resistance during operation. 3、The surface of the roller should be carefully processed to ensure the specification accuracy and surface roughness. The surface roughness should be above Ra0.16, and there should be no air holes and air grooves. The thickness of the roll surface should be uniform when working, otherwise the temperature of the roll surface is not uniform and endangers the product quality.   4、The raw material of rolls should have excellent heat transfer performance. Usually, use frozen pig iron. In special cases, use cast steel or molybdenum-chromium carbon steel. Whether heating or cooling, it can be quickly and evenly distributed.

CNC precision parts processing, refers to the production and processing drawings marked on the high precision, subject to precision machining equipment to achieve. Mechanical processing manufacturers ultra-precision machining equipment specifically: CNC machining centers, precision grinding machines and CNC lathes, etc.; CNC precision parts machining center machine tool itself high precision, high precision, complex class, small batch small batch production has distinctive advantages; precision grinding machine belongs to one of the precision machining equipment, mainly finishing, specifically for quenching treatment of small batch production; CNC lathe is also automated processing Equipment, general shaft, rod, round type small batch production, for special precision requirements or small batch production small batch production is relatively advantageous. Specific measures to enhance the basic principles of component strength are: the use of high-strength raw materials, raw materials to enhance the strength and reduce internal stress heat treatment, control the processing process to reduce or remove microscopic defects, etc.; minimize the load on the components; expand the size of the dangerous profile of components, reasonable design profile shape to expand the moment of inertia of the profile; properly involved in the structure of the components to reduce the degree of stress concentration.

Machine production process refers to all the whole process of making products from raw materials (or semi-finished products processing). For machine production includes the delivery and preservation of raw materials, preparation for production, manufacture of blanks, processing and heat treatment of parts, assembly, and commissioning of products, painting and packaging, etc. The content of the production process is very broad, modern enterprises use the principles and methods of systems engineering to organize production and guide production, the production process is seen as a production system with import and export. In the production process, the whole process of changing the shape, size, location and nature of the production item to a finished or semi-finished product is called the whole process. It is the main part of the production process. The whole process is divided into casting, forging, stamping, welding, machining, assembly and other processes. The whole process of machinery manufacturing generally refers to the sum of the whole process of machining parts and the whole process of assembling machines, while the other whole processes are called the whole process of auxiliary tools, such as transportation, storage, power supply, equipment maintenance, etc. Process process is a combination of one or more sequential steps, a step by having more than one process combination. Precision machining is a type of process that uses processing machinery to change the size or function of a workpiece. According to the temperature condition of the workpiece to be machined, it can be divided into cold machining and hot machining. Generally speaking, processing at room temperature without causing chemical or physical phase transformation of the workpiece is called cold processing. Generally speaking, processing at a temperature greater or less than room temperature will cause chemical or physical transformation of the workpiece, which is called hot processing. Cold machining is divided into cutting and pressure machining according to the difference of processing methods. Thermal processing is more common in heat treatment, forging, casting and welding.

CNC precision machining, refers to the production and manufacturing design drawings marked on the high precision, requires precision machining machinery and equipment to complete the task. Mechanical processing manufacturers ultra-precision machining machinery and equipment are mainly: CNC machining centers, precision grinding machines and CNC lathes, etc.; CNC machining center machine tool itself is highly accurate, high precision, more complex class, small batch parts processing has a unique advantage; precision grinding machines belong to one of the precision machining machinery and equipment, mainly finishing, mainly for quenching solution parts processing; CNC lathe is also Automatic technology processing equipment, usually shaft, rod, round type parts processing, for special precision requirements or small batch production parts processing is relatively more advantageous. CNC machining process and basic working principle.   1、Distinction of process and work step; confirmation of tool setting point and tool change point.   2、Confirmation of manufacturing route; selection of manufacturing method and confirmation of manufacturing plan.   3、The scientific and reasonable selection of machine tools, the number of workpiece precision selection of different models.   4, the assembly of parts and fixtures selection.   5, the selection of tools and the confirmation of the cutting dosage.   6, CNC machining parts process performance analysis, scientific and reasonable production process.

In the workflow of non-standard parts processing, the foundation is what the most important, precision mechanical parts processing is also the same, often first production and processing of fine reference, and then continue to use the fine reference positioning production and processing of other surfaces. For the box parts, generally speaking, is the main hole for the coarse reference for the production of processing plane, and then use the plane for the production of fine reference for the processing of hole system; for shaft parts, generally are the outer circle as a coarse reference for processing the center hole, and then the center hole for the fine reference for the production of processing the outer circle, end face and other surfaces. If there are several fine benchmark, it should be based on the sequence of benchmark conversion and further improve the basic principles of processing accuracy to specific arrangements for the production and processing of the base surface and the main surface.   The specific working principles of non-standard parts processing can be divided into four levels. The main surface of the part is generally processing accuracy or surface quality requirements are relatively high surface, their production and processing product quality good or bad to a whole part of the product quality has a great impact, its processing procedures are often more, so should first specific arrangements for the production and processing of the main surface, and then the other surface production and processing moderate specific arrangements in the middle of their cross. Usually the assembly base surface, work surface, etc. as the main surface, and the keyway, fastening with the light hole and screw hole as a secondary surface.

Precision machining is an operation that transforms a workpiece, and there are two classifications: cold machining and heat treatment. Precision machining is the process of transforming the size or performance of a workpiece by machining machinery. It is divided into cold machining and heat treatment according to the ambient temperature of the workpiece to be machined. Cold machining is usually done at room temperature and does not cause chemical or physical changes to the workpiece. Processing that is usually at higher or lower than room temperature and causes chemical or physical changes to the workpiece is called heat treatment. Cold processing can be divided into cutting and pressure processing according to the difference of processing methods. Heat treatment is more common in heat treatment, forging, casting and welding. Steel and aluminum have different material densities on the premise that the material is moderately hard and soft, and technical engineers will fully consider the overall use of performance factors to confirm the material. Precision machining of the material standards are still some, not what material are used the same processing technology, such as too soft or hard material, the front one can choose ordinary tools and cutting volume large, the latter one must be high hardness or tool small amount of cutting. Precision machining must pay attention to the density of the material before processing, if the density is too large, equivalent to the hardness is also very large, the processing process standards are also large.