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

In order to better ensure the precision of precision parts machining, coarse and fine mechanical parts production and processing are carried out separately. Because of the coarse mechanical parts production processing, drilling volume, the workpiece by the cutting speed, clamping force, more thermal value, and its mechanical parts production processing surface layer has a more obvious machining hardening condition, the workpiece has a large internal stress, if the coarse and fine mechanical parts production processing continues, the depth of the parts after processing accuracy will be due to the ground stress again all over and quickly missing.   In the precision parts processing process line, it is often encountered that there is a heat treatment process. Heat treatment process parts are allocated as follows: to improve the drilling production processing characteristics of metal materials, such as quenching, quenching, heat treatment, etc., generally allocated to carry out after the initial processing. Precision parts processing steps are very demanding, under the knife, out of the knife a loop. Mastering the precision accuracy of the specifications can reduce the consumption of raw materials to control costs. For example, 1mm positive and negative pole is how many μm, etc., if the wrong specifications will become scrap, the parts can not be applied to the equipment. Each piece of equipment is composed of many different small parts, and each part plays a particularly important role. Parts must be assembled, so the precision parts processing manufacturer's regulations are also higher, a variety of different parts processing after we can get more suitable for their own parts, so in order to better be able to make this product can be better to their own service, so precision parts processing this key step.  

1. Blanking: There are many ways of blanking, usually by several combinations. a. Use the shearing machine to cut out the unfolded drawing, that is, the shape, length and width of the required sheet metal parts, combined with the punching machine and die punching, corner cutting, etc; b. Punch blanking requires short working hours and high efficiency. The flat part structure after the parts are unfolded on the sheet metal step by step is formed by punching. c. CNC blanking, through the preparation of CNC programs, CNC machine tools according to the program punching forming. In addition, there is laser blanking, that is, laser cutting. 2. Flanging tapping: flanging is hole drawing, that is, machining a slightly larger hole on a smaller base hole to increase strength and prevent tooth slippage. It is usually used for thin sheet metal processing. 3. Punch processing: Punch processing is completed by the corresponding die, such as punching and corner cutting, punching and blanking, punching and bulge. 4. Riveting processing: operations are completed by a press or riveting machine, such as rivet studs, rivet nuts, and rivet screws. 5. Bending processing: generally, it is coordinated by the processing bending machine and bending mold to make the plane material into a three-dimensional shape. 6. Welding processing: welding refers to the combination of multiple parts, usually including robot welding, carbon dioxide shielded welding, argon arc welding, spot welding and other methods, which can be selected according to needs. 7. Surface treatment: It is usually used to protect materials from oxidation, and the material surface is coated with protective film, such as phosphating film, baking varnish, etc. 8. Assembly: combine several parts in a certain way to make them into finished products.

All kinds of tools and products used in our daily production and life, ranging from the base and body shell of the machine tool to the shell of a germ head screw, button and various household appliances, are closely related to the mold. The shape of the mold determines the shape of these products, and the processing quality and precision of the mold also determine the quality of these products. Because of the different materials, appearances, specifications and uses of various products, molds are divided into casting molds, forging molds, die-casting molds, stamping molds, and injection molds. General definition of mould: in industrial production, parts or products made of metal or non-metallic materials by various presses and special tools installed on the presses are generally called moulds. A set of stamping die is composed of many parts. The quality of the parts directly affects the quality of the stamping die, and the final quality of the parts is guaranteed by finishing, so it is important to control the finishing. In most domestic mold manufacturing enterprises, the methods adopted in the finishing stage are generally grinding, electric machining and bench work processing. At this stage, many technical parameters such as part deformation, internal stress, shape tolerance and dimensional accuracy should be controlled. In specific production practice, it is difficult to operate. The processing of mold parts can be roughly divided into three categories according to the different appearance and shape of the parts: plates, special-shaped parts and shafts. The common technological processes are roughly as follows: rough machining, heat treatment, fine grinding, electrical processing, fitter (surface treatment), and assembly processing.

1. Stamping parts are the workpieces with the required shape and size, which are produced by plastic deformation or separation of plates, strips, pipes, profiles, etc. by applying external forces on the stamping press and die Forming processing method. 2. Stamping parts are mainly formed by stamping metal or non-metallic sheets with the help of the pressure of the press through the stamping die. 3. Stamping parts are characterized by light weight, good rigidity, and plastic deformation of sheet metal after stamping on the premise of low material consumption, The internal structure of the metal is improved, so that the strength of the stamping parts is improved. 4. Stamping parts have high dimensional accuracy, are uniform and consistent with module dimensions, and have good interchangeability. They can meet general assembly and use requirements without further machining. 5. During the stamping process, the stamping parts have good surface quality and smooth and beautiful appearance because the material surface is not damaged, which are surface painting, electroplating, phosphating and other surface treatments Provides convenient conditions.

1. Each type of spring has different specifications, which have been determined during design. Springs should not be easily replaced with each other in use, and should not be changed at will. 2. The selection of the spring mounting hole and the diameter of the central shaft is critical to the normal use of the spring, and both play a role in stabilizing and guiding the spring. 3. The guide length of the spring refers to the length of the central axis of the spring and the depth of the recess. If the guide length is insufficient, the spring will bend or tilt under force, causing friction between the spring and the recess and the central axis, resulting in the spring Early failure of. When ensuring the spring stroke, the guide length is greater than 1/2 of the free length. 4. The upper and lower mounting surfaces of the spring must be parallel to each other. The upper and lower ends of the standard spring are machined very smoothly by the equipment. However, if the spring is sheared, the joint cannot be flush with the end face. 5. During mold repair and maintenance, new and old springs should not be used together, which will cause uneven load on the spring, which is an early failure of the spring with large load. 6. Prevent impurities such as scrap iron and waste materials from mixing in the spring. The sundries will reduce the effective number of coils of the spring, so that the local part of the spring will be damaged by high stress. During use, it is necessary to frequently check whether there are foreign matters in the spring. 7. Maintenance personnel often modify standard springs due to lack of suitable springs in use, such as truncation, grinding of internal and external diameters or tandem springs, which will cause the springs to fail to maintain their original characteristics, resulting in early invalid.

1. Ordinary carbon steel plates, such as Q195, Q235, etc. 2. High quality carbon structural steel plates have guaranteed chemical composition and mechanical properties. Low carbon steel is widely used, such as 08, 08F, 10, 20, etc. 3. Electrical silicon steel plate, such as DT1 and DT2. 4. Stainless steel plates, such as 1Cr18Ni9Ti, 1Cr13, etc., are used to manufacture parts with anti-corrosion requirements. 5. Low alloy structural steel plates, such as Q345 (16Mn) and Q295 (09Mn2), are commonly used to manufacture important stampings with strength requirements. 6. Copper and copper alloys (such as brass), with grades of T1, T2, H62, H68, etc., have good plasticity, conductivity and thermal conductivity. 7. Aluminum and aluminum alloy, commonly used grades are L2, L3, LF21, LY12, etc., with good shaping, small and light deformation resistance.    

1. Burr: Burr may occur when the die blanking clearance is too large, too small or uneven, the concave and convex die edges are not sharp enough, and the blanking state is not good. 2. Parts are warped: a. In the blanking process, the stretching and bending forces of the parts are large, and the parts are prone to warp. The improved method can use punch and pressing plate to tightly press and keep sharp edge during blanking, Can receive good results. b. When the shape of the part is complex, the shear force around the part is uneven, so the force from the periphery to the center is generated, which makes the part appear warping. The solution is to increase the pressing force. c. When there is oil or air between the die and the parts, or between the parts and the parts, the parts will warp, especially thin materials and soft materials. It can be realized through uniform oiling Air vents are provided to eliminate warping. 3. Wrinkle: a. The drawing depth of the stamping part is too deep, which causes the sheet metal to flow too fast in the process of feeding, forming wrinkles. b. The R angle of the female die is too large during the drawing process of the stamping part, which causes that the punch cannot press the material during the drawing process, resulting in the sheet metal flowing too fast and forming wrinkles. c. The pressing bar of stamping parts is unreasonable, too small and the position is incorrect, which can not effectively prevent the sheet from flowing too fast and forming wrinkles. d. The design of die positioning is unreasonable, which leads to the inability to press the material or the small pressing edge during the stretching process of the stamping part, which leads to the inability to press the material during the stretching process, causing wrinkles. The method to solve the wrinkle is to use reasonable pressing device and reasonable use of drawing rib. 4. Dimensional accuracy error: a. The dimensional accuracy of the cutting edge in die manufacturing is not up to standard, which causes the size of the workpiece to be out of tolerance. b. In the stamping production, the springback of the parts causes that the positioning surface of the next process is not completely consistent with the parts, and the deformation occurs in the stamping process, which affects the dimensional accuracy. c. Poor positioning of parts, unreasonable design, moving parts during stamping. There are also defects in the design of parts, resulting in inaccurate positioning and affecting the dimensional accuracy. d. Due to improper adjustment of the previous process or wear of fillets, the deformation of multi process parts is mentioned unevenly, resulting in dimensional changes after blanking. For the problems caused by the above points Therefore, we should take necessary control measures, such as reasonable stamping part shape and tolerance grade, improving die manufacturing accuracy, designing rebound compensation mechanism, etc. 5. Crushing: a. There are sundries on the material surface. Check whether there are sundries on the material surface during stamping, and clean them with air gun and rag if there are sundries. b. There are foreign matters on the mold surface. Use tools to clean the foreign matters on the die surface, and select the appropriate lower die clearance according to the plate thickness. c. The die strip is magnetic. Change the processing sequence, and process from outside to inside and line by line when punching the workpiece. First trim (trim) and then punch the mesh, and there is deformation in special forming and stamping, It may be that the pressure is too high, and the spring in the mold needs to be replaced. d. The stamping oil does not meet the requirements. Replace the current stamping oil, and select the special stamping oil containing vulcanizing extreme pressure additive. 6. Scratch: The main reason for the scratches of parts is that there are sharp scars on the mold or metal dust falls into the mold. The preventive measure is to grind the trace on the mold and remove the metal dust. 7. Bottom crack: the main reason for the crack at the bottom of the part is poor plasticity of the material or too tight pressing of the die blank holder. The preventive measure is to replace the material with good plasticity or loosen the blank holder. 8. Side wall wrinkling: the main reason for the side wall wrinkling of parts is that the material thickness is not enough (if it is relatively small, the thickness can be thinner) or eccentric when the upper and lower molds are installed. Resulting in a large gap on one side, The clearance on the other side is small. The preventive measure is to immediately replace the material and readjust the mold.

1. The laser cutting machine is the main equipment for blanking in sheet metal processing nowadays. It has fast processing speed, high precision, short cycle, and can process various shapes. It is the main processing method for blanking in sheet metal processing. 2. Sheet metal processing parts can not only have flat shape, but need to punch a bump, sprout, buckle, etc., all of which need to go through the process of "punching". The current numerical control punch can install dozens of sets of molds at most, which is programmable and fast, and can also assist the laser cutting machine in blanking. 3. The bending equipment is also being updated, including CNC bending machine, bending center (manipulator assisted bending), CNC bending machine, etc. 4. Previously, welding wire was basically used for welding, and carbon dioxide was used for a small part; With the continuous development of technology, argon arc welding CO2 gas shielded welding, welding robot, etc.

Aluminum alloy stampings are characterized by low density, good conductivity and heat conductivity, and good corrosion resistance. The surface treatment of aluminum alloy can meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of products. The surface treatment commonly used for aluminum alloy includes spraying, painting, electroplating, anodizing, infiltration, oil spraying and sandblasting. 1. Spraying: It refers to the use of pressure or electrostatic force to attach paint or powder to the surface of the workpiece, so that the workpiece has the function of anti-corrosion and appearance decoration. 2. Baking paint: paint primer and finish on the base material, and send each coat of paint to the dust-free constant temperature baking room for baking. 3. Electroplating: the process of using electrolysis to make the surface of metal or other material parts adhere to a layer of metal film. It can prevent corrosion, improve wear resistance, conductivity, reflectivity and enhance aesthetics. 4. Anodic oxidation: electrochemical oxidation of metal or alloy. The metal or alloy parts are used as anodes to form oxide films on their surfaces by electrolysis. The metal oxide film changes the surface state and properties, Such as surface coloring, improving corrosion resistance, enhancing wear resistance and hardness, protecting metal surface, etc. 5. Infiltration: the sealing medium (usually low viscosity liquid) is infiltrated into the micropores (fine seams) through natural infiltration (i.e. micropore self-priming), vacuum pumping and pressurization, and then the gap is filled The sealing medium in the gap is solidified by cooling or heating to seal the gap. 6. Oil spraying: spray paint on the product surface and dry it naturally. 7. Sand blasting: It uses compressed air as the power to form a high-speed jet beam to spray the materials (copper ore, quartz sand, carborundum, iron sand, sea sand) to the surface of the workpiece to be treated at a high speed, so as to change the appearance or shape of the external surface of the workpiece surface, Due to the impact and cutting effect of abrasive on the workpiece surface, the workpiece surface can obtain a certain degree of cleanliness and different roughness, and the mechanical properties of the workpiece surface can be improved, so the fatigue resistance of the workpiece is improved The adhesion between layers extends the durability of the coating film, and is also conducive to leveling and decoration of the coating.

Sheet metal parts refer to metal parts that have been processed by technology or machinery. Usually, metal raw materials are used to make them plastic deformation through process or stamping, and the shape formed usually meets the requirements of our rules. Molding can be divided into manual molding and mechanical molding. Process forming is usually used to make up for processing or trimming fields, and is rarely used. However, when processing some materials with disordered shapes or easy to deform, it is still inseparable from process molding. Up to now, sheet metal processing is mainly used to manufacture the shells of some packaging equipment, such as cabinets, car bodies, stainless steel cases, computer cases, etc. Because sheet metal includes stamping, bending, shearing and cutting, most of the sheet metal is used for processing metal sheets, and a small amount of sheet metal is used for manufacturing. Classification, processing and use of sheet metal parts I Sheet metal parts can generally be divided into three categories: 1. Flat plate: refers to ordinary flat punching shear piece. 2. Zigzag type: bend and weld after opening with CAD according to the planning drawing. 3. Forming type: regular surface or free-standing surface parts processed by stretching and other forming methods. These parts are formed by stamping and deformation of flat blank, which is very different from the parts processed by the common machining method. In the stamping processing method, zigzag deformation is the main processing method to make sheet metal parts have disordered spatial position relations. II Application scope of sheet metal processing: Sheet metal parts are widely used in electromechanical, light industry, automobile and other fields. It includes the following aspects: 1. Automobile field With the improvement of Chinese people's living standard, cars will enter thousands of households, which will promote the rapid development of the domestic automotive field. Auto manufacturers will outsource non base businesses while expanding production plans, so they will outsource some auto parts to Hefei sheet metal processing plant, which will supply, distribute and process automobiles. 2. Electronic communication field The electronic field is a rapidly developing field in recent years, and also a field where sheet metal was widely used at that time. Due to the characteristics of rapid technology update, diversified products and timely production in this field, this field is facing a greater risk impact from the mall. Most well-known companies at home and abroad outsource the sheet metal business and use limited funds for technology development. These companies include Lucent, Bell, ABB, Nokia, Siemens, Alstom, Philips and Huawei., Their outsourced sheet metal processing business is worth tens of billions of yuan every year. 3. Elevator field The elevator parts in other places are mostly sheet metal parts, and the types of elevator parts are complex. Each large elevator manufacturer has dozens of suppliers to distribute and process them. For example, Xizi Otis, Schindler, Mitsubishi, Hyundai, Hitachi and other famous elevator companies have their own stable suppliers, and their outsourced Guangzhou sheet metal business is about several billion yuan.