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

The so-called OEM means that I place an order for you to produce, and then paste my brand, which is my product. Specifically, it refers to that one Dalian machining manufacturer produces products and product accessories for another according to the requirements of another Dalian machining manufacturer, which is also called fixed brand production or authorized OEM production. It represents either outsourcing processing or subcontract processing, commonly known as co processing. For example: Party A looks at Party B's products, asks Party B to produce them, and uses Party A's trademark, which is called ODM; Party A brings its own technology and design to Party B for processing, which is called OEM; For Party B, it is only responsible for producing and processing other people's products, and then pasting other people's trademarks, which is called OBM. Machining refers to the process of changing the overall dimension or performance of the workpiece through a mechanical device. According to the difference in processing methods, it can be divided into cutting and pressure processing. The machines required for processing are digital display milling machine, digital display molding grinder, digital display lathe, electric spark machine, universal grinder, machining center, laser welding, medium wire walking, fast wire walking, slow wire walking, cylindrical grinder, internal grinder, precision lathe, etc., which can be used for turning, milling, planing, grinding and other processing of precision parts. Such machines are good at turning, milling, planing, grinding and other processing of precision parts, and can process various irregular shaped parts, Machining accuracy can reach 2 μ m。 The benefits of co processing are: 1. Reduce investment in fixed assets such as plant and equipment; 2. You can have your own products without much capital; 3. Focus on design, R&D and sales to avoid wasting time; 4. We can give full play to our advantages and hand over production related technologies and work to professional enterprises, which can improve product quality and shorten production cycle.

CNC machining refers to a process method of machining parts on CNC machine tools. The process procedures of CNC machine tools and traditional machine tools are generally consistent, but there have also been significant changes. A machining method that uses digital information to control the displacement of parts and tools. Shenzhen CNC machining is an effective way to solve the problems of variety, small batch, complex shape, high precision and high efficiency and automatic machining of parts. The programming methods of CNC machining can be divided into manual (manual) programming and automatic programming. Manual programming, all contents of the program are manually prepared according to the instruction format specified by the CNC system. Automatic programming is computer programming, which can be divided into automatic programming methods based on language and painting. However, no matter what kind of automatic programming method is adopted, it needs corresponding supporting hardware and software. How to execute program repeatedly in CNC machining If the line number of the first line of the program is N10, change the M30 instruction at the end of the program to GOTO 10, which is an infinite loop. Repeat the program. Another method is to change M30 to M99. In addition, the macro program can specify the number of repetitions, or infinite loops. CNC machining refers to a process method of machining parts on CNC machine tools. The process procedures of CNC machine tools and traditional machine tools are generally consistent, but there have also been significant changes. A machining method that uses digital information to control the displacement of parts and tools. It is an effective way to solve the problems of variety, small batch, complex shape, high precision and high efficiency and automatic processing of parts.

Improvement method of automobile parts stamping process: 1. When designing the structure and shape of automobile stamping parts, Shenzhen Precision Parts Processing Factory suggests to use simple and reasonable surfaces and their combinations, and at the same time, it should try to minimize the number of machined surfaces and the processing area. 2. The materials used for automobile stamping parts should not only meet the technical requirements of product design, but also meet the requirements of stamping process and the processing requirements of cutting, electroplating, cleaning and other processes after stamping. 3. Requirements for automobile stamping formability For the forming process, in order to facilitate stamping deformation and improve the quality of parts, materials should have good plasticity, small yield strength ratio, large plate thickness directivity coefficient, small plate plane directivity coefficient, and small ratio of material yield strength to elastic modulus. For the separation process, it is not necessary for the material to have good plasticity, but it should have a certain plasticity. The better the plasticity is, the harder it is to separate the material. 4. Select a reasonable method for preparing blanks in mechanical manufacturing, which can directly use profiles, casting, forging, stamping and welding. The selection of blank is related to the specific production technical conditions, and generally depends on the production batch, material properties and processing possibilities. 5. Specify the processing cost of parts with appropriate manufacturing accuracy and surface roughness. The processing cost of metal stamping parts will increase with the improvement of precision, so the surface roughness of metal stamping parts should also be properly specified according to the actual needs of mating surfaces. 6. The stamping oil used in the processing of automobile parts shall meet the process requirements. The special stamping oil with excellent performance can significantly improve the processing environment and improve the precision of the workpiece. Four elements of mold processing accuracy: 1. Dimensional accuracy refers to the degree of conformity between the actual size of the part after the mold processing and the tolerance zone center of the part size. Dimensional accuracy is controlled by dimensional tolerance. The dimensional tolerance is the allowable variation of part size in die processing. When the basic dimensions are the same, the smaller the dimensional tolerance and, the higher the dimensional accuracy. 2. Shape accuracy refers to the degree to which the actual geometric shape of the part surface after the mold processing is consistent with the ideal geometric shape. 3. Position accuracy refers to the actual position accuracy difference between the relevant surfaces of the parts after machining of Huangjiang die. The items for evaluating the position accuracy include parallelism, perpendicularity, inclination, coaxiality, symmetry, position, circular runout and total runout. The position accuracy is controlled by the position tolerance, and the position tolerance of each project is also divided into 12 accuracy levels. 4. The relationship among dimension precision, shape precision and position precision. Generally, when designing machine parts and specifying the machining accuracy of parts, attention should be paid to controlling the shape error within the position tolerance, and the position error should be less than the size tolerance. That is, the shape accuracy of precision parts or important surfaces of parts shall be higher than the position accuracy, and the position accuracy shall be higher than the dimension accuracy.

Shenzhen CNC machining will help you understand the surface hardening treatment technology of metal mould. The diffusion method of metal carbide coating technology is to place the workpiece in a special medium and form a layer of metal carbide of several microns to tens of microns on the workpiece surface by diffusion. The carbide layer has extremely high hardness, HV can reach 1600~3000 (depending on the type of carbide). In addition, the carbide coating is metallurgically combined with the matrix, which does not affect the surface finish of the workpiece. It has extremely high wear resistance, anti seizure (bonding), corrosion resistance and other properties, which can greatly improve the service life of tools, dies and mechanical parts. The method of forming superhard compound film on the surface of the workpiece is an effective and economical method to greatly improve its wear resistance, anti seizure (anti adhesion), corrosion resistance and other properties, so as to greatly improve its service life. At present, the superhardening treatment methods of workpiece surface mainly include physical vapor deposition (PVD), chemical vapor deposition (CVD), physical chemical vapor deposition (PCVD), and diffusion metal carbide coating technology Among them, PVD method has the advantages of low deposition temperature and small deformation of the workpiece. However, due to the poor adhesion between the film and the substrate, and the poor process wrapping, it is often difficult to play the performance advantages of superhard compound film. CVD method has outstanding advantages such as good film substrate bonding force and good process wrapping, but for a large number of iron and steel materials, the subsequent matrix hardening treatment is more troublesome, and the film is easy to be damaged with a little carelessness. Therefore, its application mainly focuses on materials such as cemented carbide. The deposition temperature of PCVD method is low, and the film substrate bonding force and process wrapping property are greatly improved compared with PVD method, but compared with diffusion method, the film substrate bonding force still has a large gap. In addition, because PCVD method is still plasma film forming, although the wrapping property is improved compared with PVD method, it cannot be eliminated. The metal carbide coating formed by the diffusion method metal carbide coating technology is metallurgically bonded with the matrix, and has a film substrate bonding force unmatched by PVD and PCVD. Therefore, this technology can really give play to the performance advantages of the super hard film. In addition, this technology does not have the problem of coating, and the subsequent matrix hardening treatment is convenient and can be repeated for many times, making the applicability of this technology more extensive.

CNC processing requires us to follow a scientific method. Whether it is part clamping method, fixture selection or processing sequence, the clamping method for processing parts in Shenzhen CNC machine tool processing should also reasonably select the positioning datum and clamping scheme. When selecting fine datum, the two principles of datum unification and datum overlap shall be generally followed. In addition to these two principles, we should also consider: a. The machining of all surfaces shall be completed in one positioning clamping as far as possible. Therefore, the positioning method that facilitates the machining of all surfaces shall be selected. b. When the workpiece is clamped at one time, all surfaces of the workpiece shall be machined. c. When determining the placement position of the workpiece on the workbench, the influence of machining, tool length and stiffness on machining quality should be considered. d. Fixtures used in control processing shall be adjustable by assembling general components as much as possible to shorten the production preparation cycle. Arrange processing sequence When arranging the processing sequence, the basic principles must be followed, including surface first, hole second, rough first and fine second. In addition to these basic principles, we should also follow the following principles, as follows: A. Centralized processing shall be carried out according to tools to avoid repeated use of the same tool and reduce the number and time of tool change. B. For the hole system with high coaxiality requirements, all processing of the hole system shall be completed after one positioning, and then the hole system at other coordinate positions shall be processed to eliminate the error caused by repeated positioning and improve the coaxiality of the hole system. c. Select the determined tool point and tool change point, which should not be replaced after confirmation. There are two main steps in clamping, namely clamping and positioning. When clamping the traditional machine tool, the number of clamping times increases due to the limitation of the machine tool capacity. When clamping the CNC machine tool, multiple surfaces can be processed at one time, thus reducing the clamping error. In the process of clamping, special fixtures are used to facilitate positioning and clamping, but the cost is very high. If the number of pieces to be processed is large, the cost shared in the fixture cannot be ignored. Therefore, attention should be paid to this when designing and using special fixtures. CNC machining can be debugged through instruments to meet the requirements of positioning standards. This process does not require special fixtures, and only ordinary pressing elements can complete the clamping, thus greatly reducing the cost.

In numerical control processing, aluminum casting is usually made by metal mold. The metal material aluminum and aluminum alloy have good fluidity and plasticity, but it is very easy to blacken in the process of application. Today, let's talk about why the aluminum surface is blackened in Dalian numerical control processing. What are the reasons for this? 1. The structural design is not scientific. The aluminum alloy die castings were not treated correctly after cleaning or pressure inspection, which created a standard for the aluminum alloy die castings to get mildewed and blackened, and accelerated the formation of mildew. 2. Logistics warehousing management is not timely. When aluminum alloy die castings are stored at different heights in the warehouse, their mildewing conditions are different. 3. Internal structure of aluminum alloy. Many aluminum alloy die casting manufacturers can not completely clean and tidy without other cleaning treatments or simply flushing with water after the die casting and machining processes. The surface of die casting aluminum is left with mold release agent, cutting fluid, saponification fluid and other etching substances and other stains, which accelerates the growth of mold spots and blackening of aluminum alloy die castings. 4. External environmental reasons of aluminum alloy. Aluminum is an active metal material, which is easy to be oxidized and blackened or mildewed under certain temperature and environmental humidity standards. It is affected by the characteristics of aluminum itself. 5. Improper selection of cleaning agent. The selected cleaning agent has strong etching, resulting in etching and oxidation of die cast aluminum. The blackening of aluminum surface is caused by the oxidation of aluminum products. It is recommended not to remove it. The aluminum oxide is relatively stable in the air. It is difficult to re oxidize. It can protect the aluminum inside from oxidation. Aluminum: silver white light metal. It is malleable. Goods are often made into rods, sheets, foils, powders, ribbons and filaments. It can form an oxide film to prevent metal corrosion in humid air. When heated in air, aluminum powder and aluminum foil can burn violently and emit dazzling white flame. It is easy to dissolve in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, but difficult to dissolve in water. The relative density is 2.70. The melting point is 660 ℃. The boiling point is 2327 ℃. Aluminum is the most abundant metal element in the crust, ranking the third after oxygen and silicon. The development of the three important industries of aviation, construction and automobile requires that the materials have unique properties of aluminum and its alloys, which is greatly conducive to the production and application of this new metal aluminum. It is widely used.

Machining method with accuracy of 1 μ m. Precision machining is realized by using precision machine tools, precision measuring tools and meters under strictly controlled environmental conditions. The machining accuracy reaches or exceeds 0.1 μ m, which is called ultra precision machining. In the aerospace industry, precision machining is mainly used to process precision mechanical parts in aircraft control equipment, such as precision mating parts in hydraulic and pneumatic servo mechanisms, frames and shells of gyroscopes, air floating, liquid floating bearing components and floats. The precision parts of aircraft have complex structure, small stiffness, high precision requirements, and the proportion of difficult to machine materials is large. The process effect of precision machining is: ① The geometric shape and mutual position accuracy of parts shall reach micron or angular second level; ② The limit or feature dimension tolerance of the part is less than micrometer; ③ The micro unevenness of part surface (average height difference of surface unevenness) is less than 0.1 μ m; ④ Mutual accessories can meet the requirements of combining force; ⑤ Some parts can also meet the requirements of precise mechanical or other physical characteristics, such as the torsional stiffness of the torsion bar of the float gyroscope, the stiffness coefficient of the flexible element, etc. Precision machining mainly includes precision turning, precision boring, precision milling, precision grinding and grinding. ① Fine turning and fine boring: Most of the precision light alloy (aluminum or magnesium alloy, etc.) parts of aircraft are processed in this way. The natural single crystal diamond cutter is generally used, and the arc radius of the blade is less than 0.1 μ m. The precision of 1 μ m and the surface roughness with an average height difference of less than 0.2 μ m can be obtained by machining on a high-precision lathe, and the coordinate accuracy can reach ± 2 μ m. ② Finish milling: used for processing aluminum or beryllium alloy structural parts with complex shapes. Rely on the accuracy of the guideway and spindle of the machine tool to obtain higher mutual position accuracy. Precise mirror surface can be obtained by high-speed milling with carefully ground diamond cutter head. ③ Fine grinding: used for machining shaft or hole parts. Most of these parts are made of hardened steel with high hardness. Most high-precision grinding machine spindles use hydrostatic or hydrodynamic liquid bearings to ensure high stability. The limit precision of grinding is not only affected by the rigidity of machine tool spindle and machine bed, but also related to the selection and balance of grinding wheel, the machining precision of workpiece center hole and other factors. The precision of 1 μ m and out of roundness of 0.5 μ m can be obtained by fine grinding. ④ Grinding: use the principle of mutual grinding of mating parts to select and process the irregular convex parts on the machined surface. Abrasive grain diameter, cutting force and cutting heat can be precisely controlled, so it is the highest precision processing method in precision machining technology. The hydraulic or pneumatic mating parts in the precision servo components of the aircraft and the bearing parts of the dynamic pressure gyro motor are all processed in this way to achieve the accuracy of 0.1 or even 0.01 μ m and the micro unevenness of 0.005 μ m.

Processing method of large mechanical parts: Connecting pieces: screws and bolts. Transmission parts: gear, chain, worm and belt. Shafting parts: shaft, coupling, clutch and bearing. There are other components: springs, etc. The processing methods of large mechanical parts mainly include: turning, pliers, milling, planing, inserting, grinding, drilling, boring, punching, sawing, etc. It can also include wire cutting, casting, forging, electric corrosion, powder processing, electroplating, various heat treatment, etc. Car: vertical car and horizontal car; The new equipment is CNC lathe, which mainly processes revolving bodies; Milling: vertical milling and horizontal milling; The new equipment is CNC milling, also called machining center; It is mainly used to process grooves and linear surfaces. Of course, it can also process cambered surfaces with two or three axes; Planing: it mainly processes the linear surface of the contour, and the surface roughness processed under normal conditions is not as high as that of the milling machine; Insertion: it can be understood as a vertical planer, which is very suitable for non complete arc processing; Grinding: there are surface grinding, external open powder satin and other crazy round grinding, internal hole grinding, tool grinding, etc; For high-precision surface processing, the machined workpiece surface roughness is particularly high; Drilling: hole processing; Boring: machining of holes with larger diameter and higher accuracy, and machining of larger workpiece profiles. There are many processing methods for holes, such as numerical control processing, wire cutting, etc. Boring: mainly boring the inner hole with boring cutter or blade; Punching: It is mainly formed by punching machine, and can punch round or special-shaped holes; Saw: It is mainly processed by sawing machine, and is commonly used in blanking process.

Sheet metal processing The painting process of the sheet metal surface is of great significance to the sheet metal processing, and the surface painting has a protective effect on the sheet metal. The sheet metal case, cabinet, equipment shell, etc. will not be oxidized under the protection of the paint layer when exposed to the air, so they will not rust and have the function of waterproof and rust prevention. Dongguan sheet metal processing The painting process generally has four steps: first, treat the base course, then make a layer of primer, then add an intermediate coat, and finally make the surface course. Let's talk about the characteristics of each step. 1. Base course treatment. The base layer of sheet metal processing products needs to be derusted first, such as sand blasting, phosphating, etc. 2. Primer. Epoxy zinc rich primer is used for sheet metal processing. The purpose of this primer is to protect steel structures and steel products against rust. The coating film has good physical and chemical properties, easy construction, and good supporting performance. The main ingredients are: epoxy resin, epoxy curing agent, zinc powder, antirust pigment, auxiliary agent and organic solvent, etc. 3. Intermediate paint. The sheet metal processing products are made of epoxy micaceous iron intermediate paint, which is used together with the epoxy zinc rich primer as the transition layer of the long-term anti-corrosion coating to enhance the sealing and anti-corrosion of the composite coating, and can also be used as the anti-corrosion and antirust primer. The film is strong and tenacious, with good adhesion and sealing, and good compatibility with the front and rear coatings. Its ingredients are: epoxy resin and curing agent, carrier iron oxide and antirust pigment. 4. Surface course. There are many kinds of paint that can be used for the surface course, such as epoxy asphalt finish, chlorinated rubber finish, acrylic and polyurethane finish, fluorocarbon finish, etc.

When quoting a prototype project, it is necessary to select an appropriate processing method according to the characteristics of the parts in order to complete the prototype project faster and better. At present, manual processing mainly includes CNC machining, 3D printing, laminating, rapid tooling, etc. Let's talk about it today The difference between CNC machining and 3D printing. First of all, 3D printing is an additive technology and CNC machining is an additive technology, so they are very different in terms of materials. 1. Differences in materials 3D printing materials mainly include liquid resin (SLA), nylon powder (SLS), metal powder (SLM) and gypsum powder (full-color printing) , sandstone powder (full-color printing), wire (DFM), sheet (LOM), etc. Liquid resin, nylon powder and metal powder It has occupied most of the industrial 3D printing market. The materials used for CNC machining are all sheet materials, which are plate like materials. The length, width, height and consumption of parts are measured And then cut the corresponding size plates for processing. CNC machining materials are more selected than 3D printing, general hardware and plastic All kinds of plates can be processed by CNC, and the density of formed parts is better than 3D printing. 2. Parts difference due to forming principle As we mentioned earlier, 3D printing is an additive manufacturing. Its principle is to cut the model into N layers/N multipoints, and then follow the sequence Stacked layer by layer/bit by bit, just like building blocks. Therefore, 3D printing can effectively process and produce parts with complex structures, For example, for hollow parts, CNC is difficult to process hollow parts. CNC machining is a kind of material reduction manufacturing. The required parts are cut according to the programmed tool path through various high-speed tools. So CNC Machining can only process fillets with a certain radian, but cannot directly process inner right angles. Wire cutting/sparking and other processes are required To implement. CNC machining of external right angle is no problem. Therefore, 3D printing processing can be considered for parts with internal right angles. The other is the surface. If the surface area of the part is large, it is recommended to choose 3D printing. CNC machining of the surface is time-consuming, and If the programmers and operators are not experienced enough, it is easy to leave obvious lines on the parts. 3. Differences in operating software Most 3D printing slicing software is easy to operate, even laymen can skillfully operate slicing in a day or two under professional guidance Software. Because the slicing software is currently very simple and supports can be generated automatically, which is why 3D printing It can be popularized to individual users. CNC programming software is much more complex, which requires professionals to operate. People with zero foundation usually need to learn about half a year. In addition, a CNC operator is required to operate the CNC machine. Because of the complexity of programming, a component can have many CNC processing schemes, while 3D printing only depends on the placement position Processing time consumption has a small part of the impact, which is relatively objective. 4. Differences in post processing There are not many post-processing options for 3D printed parts, such as polishing, oil spraying, deburring, dyeing, etc. There are various options for post-processing of CNC machined parts, including polishing, oil spraying, deburring, and electroplating, Silk screen printing, pad printing, metal oxidation, radium carving, sandblasting, etc.