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

With the rapid development of this society now, industrialization also with the new generation, precision machining inside the industrialization occupies a dominant position, for industrialization to bring quality improvement , however, it is also bad, such as will cause work deformation, then what factors lead to work deformation? If you want to know, go with me to understand it. The shape of the deformation is proportional to the complexity of the size, wall thickness size ratio and width and length, and is proportional to the material stability and rigidity. So in the design of parts as far as possible to reduce the impact of these factors on the deformation of the workpiece. Especially in the structure of large parts should be more reasonable structure. The hardness of the blank, looseness and other defects should also be strictly controlled before processing to ensure the quality of the blank and reduce the deformation of the workpiece caused by it. When the workpiece is clamped, the correct clamping point should be selected first, and then the appropriate clamping force should be selected according to the position of the clamping point. Therefore, as far as possible, the clamping point and the support point are the same, so that the clamping force acts on the support, the clamping point should be as close as possible to the processing surface, and choose the location where the force is not easy to cause clamping deformation. When there are several directions of clamping force on the workpiece, to consider the sequence of clamping force, for the workpiece and support contact clamping force should act first, and not too large, for the main clamping force to balance the cutting force, should act in the last. Secondly, to increase the contact area of the workpiece and the fixture or the use of axial clamping force. Increase the rigidity of the part is an effective solution to the occurrence of clamping deformation, but due to the characteristics of the shape and structure of the thin-walled class of parts, resulting in a lower rigidity. This results in deformation under the clamping applied force. Increasing the contact area between the workpiece and the fixture can effectively reduce the deformation of the workpiece piece during clamping. For example, in the milling of thin-walled parts, a large number of elastic pressure plate, the purpose is to increase the contact area of the contact parts; in the turning of thin-walled sleeve of the inner diameter and outer circle, whether using a simple open transition ring, or the use of flexible arbor, the whole arc jaws, etc., are used to increase the contact area of the workpiece clamping. This method is conducive to carrying the clamping force, thus avoiding the deformation of the part. The use of axial clamping force, also widely used in production, the design and production of special fixtures can make the clamping force on the end face, can solve the workpiece bending deformation due to the thin wall, poor rigidity, resulting in the workpiece.

With this era is now more and more high-tech, there are very new products have emerged, precision machining has also been reused by many people, so do you know its benchmark this problem, go together to understand it. 1. Beijing precision machining design benchmark In the parts diagram to determine the location of other points, lines, surface benchmarks, called the design benchmark. Precision machining of the sleeve parts, the outer circle and bore design benchmark is the axis of the part, the end face A is the end face B, C design benchmark, the axis of the bore is the radial runout of the outer circle benchmark. 2. Process Beijing precision machining parts in the processing and assembly process used in the benchmark, known as the process benchmark. Process benchmark according to the different uses are divided into assembly benchmark, measurement benchmark and positioning benchmark. (1) assembly benchmark assembly to determine the position of the part in the component or product benchmark, known as the assembly benchmark. (2) measurement benchmark used to check the size and position of the machined surface benchmark, known as the measurement benchmark. The bore axis is to check the radial runout of the outer circle of the measurement benchmark; surface A is to check the length L size l and the measurement benchmark. 1 machine tool composite technology to further expand with the progress of CNC machine tool technology, composite processing technology is becoming increasingly mature, including milling - turning composite, milling composite, turning - boring - drilling - gear processing and other composite, grinding composite, forming composite processing, special composite processing, etc., precision machining efficiency greatly improved.   2, Beijing CNC machine tools have new breakthroughs in intelligent technology, the performance of the CNC system has been more reflected. Such as: automatic adjustment of interference anti-collision function, after the power failure, the workpiece automatically exit the safety zone power failure protection function, processing parts detection and automatic compensation learning function, intelligent enhance the function and quality of the machine tool. More five-axis linkage high-speed machining center was introduced.   3. The robot makes the flexible combination of higher efficiency robot and host of flexible combination is widely used, making the flexible line more flexible, further expand the function, flexible line to further shorten, higher efficiency. Robots and machining centers, milling machine tools, grinding machines, gear processing machine tools, tool grinding machines, electrical processing machine tools, saws, stamping machine tools, laser processing machine tools, water cutting machine tools and other forms of flexible units and flexible production lines have begun to apply.

The machinery industry plays a vital role in economic construction. We constantly change the structure and lifestyle of today's society through various mechanical technologies and products. Make people's life and work more convenient and efficient. With the progress of machining technology and industry upgrading, high-precision machinery manufacturing has gradually become the mainstream of industry development, so the requirements for materials are relatively high. Now let's introduce how to select materials in machining and manufacturing. Material Selection Ideas and Measures Embodied in Mechanical Manufacturing 1. Selection of materials based on practical factors: In the process of mechanical manufacturing and processing, the first thing to consider is the practicality of materials. When selecting materials, it needs to meet the application and performance requirements of manufacturing and processing operations. At the same time, materials also meet the working indicators of mechanical equipment, so that manufacturing and processing can be carried out efficiently and quickly. For example, in the process of material heat treatment, for material cutting processing, it is necessary to carry out some processing operations in the hardness, toughness and surface roughness of the material, so that the performance of the material can be met. Even if the same type of parts are installed at different locations, the requirements for outward stress are different, and the corresponding machining methods are also different. Operators need to deal with and consider the specific application conditions when selecting materials. In addition, in the selection of machining materials, we should also consider the practicality, and pay attention to the economic problems of materials. Machined products should not only meet the quality standards and customer needs, but also achieve the goal of economic benefits and reduce the processing costs of enterprises. Reduce material consumption, reduce resource consumption and improve economic benefits. 2. Material selection based on load factor: In the selection of materials for mechanical manufacturing and processing, the size of the load borne by the materials is also one of the issues that need to be considered. When considering it, the reason is the load borne by the materials in the process of mechanical manufacturing and processing. If the selected material has a strong bearing capacity, the manufacturing cost of the material will be increased, and then the cost of the entire mechanical manufacturing operation will affect the economic benefits and cost pressure of the enterprise. 3. Selection of materials based on consumption factors: In terms of energy consumption, mechanical manufacturing and processing operations have always had major problems. Their excessive consumption of energy and material resources will not only affect the energy supply situation in China, but also cause serious environmental pollution due to excessive emissions. Therefore, to promote the sustainable development of China's society and environment, it is necessary to take corresponding consideration in the selection of processing materials, and try to select materials with lower energy consumption and less pollution. Common materials for CNC processing: ABS, PC, POM, PP, PMMA, nylon, bakelite, aluminum alloy, zinc alloy, low-carbon steel, copper, stainless steel, etc. In addition, Teflon, PBT, PPS, PEET, polyurethane foam, etc. can also be used as processing materials.

The application scope of aluminum alloy machined parts is very wide, mainly used in automatic mechanical equipment, automobile industry, robots, medical equipment, aviation and other fields. Why does aluminum alloy become a common material in our familiar field? Shenzhen Noble Intelligent Manufacturing Co., Ltd. believes that it may be that aluminum alloy does have good material properties, such as low density but high strength; Close to or more than high-quality steel, good plasticity, can be processed into various profiles; It has excellent conductivity, thermal conductivity and corrosion resistance. However, different industries also have different requirements for aluminum alloy. For example, in the medical equipment industry, aluminum alloy materials with medical/food grade and RoHS declaration are normally required. Because medical equipment is ultimately intended to serve people, ordinary aluminum alloys may have a negative impact on the role of equipment. Moreover, for example, the automobile and aviation industries not only have high requirements on the performance of aluminum alloy itself, but also have high requirements on the processing capacity and quality control capacity of aluminum alloy processing plants, because such industries have high requirements on the precision of parts and extremely strict tolerance control.  

Whether it is aluminum alloy parts processing demanders or aluminum alloy processing manufacturers, at present, we have a general understanding of some aluminum alloy processing equipment, such as CNC milling machine, CNC lathe, wire cutting, electric spark, grinder and CNC lathe. Their characteristics are: CNC milling machine: It can process parts that are difficult to be processed by ordinary machine tools, such as complex curve parts described by mathematical models and three-dimensional space surface parts. CNC lathe: suitable for processing round bar and round steel pipe parts. Wire cutting: including fast wire cutting, medium wire cutting and slow wire cutting equipment, which is suitable for processing metal molds and hard conductive materials. Among them, slow wire cutting can meet high requirements, but it is not suitable for processing large quantities of simple parts and materials without conductive properties. Electric spark: the principle is similar to that of wire cutting equipment, but there is a spark discharge gap between the tool electrode and the workpiece instead of direct contact. The gap is filled with working fluid. During machining, the workpiece is discharged and corroded through high-voltage pulse discharge, so as to achieve the purpose of angle cleaning (usually the right angle and R angle that cannot be processed by ordinary CNC equipment). Grinder: It can process materials with high hardness, such as hardened steel, hard alloy, etc. It can also be used for polishing some simple parts. CNC lathe: suitable for parts with high machining difficulty and precision requirements, such as shaft sleeve parts and disc parts.    

At present, the precision of precision hardware processing parts has reached the micron level. It requires not only precision processing equipment, tools, precision measuring instruments and high-tech workers, but also good processing environment is the main factor to ensure the precision of precision hardware processing. If there is too much dust, the workpiece surface will be scratched and its surface quality will be affected, so we need to strengthen the purification in the workshop. In the process of precision machining, the process system is affected by the internal heat sources such as cutting heat and friction heat, and heat exchange with the external environment. Therefore, the external ambient temperature has become an important factor affecting the machining accuracy. Due to the different heat source intensity and distribution position, the temperature rise of each part of the machine tool is different during the processing, and the thermal expansion coefficient of different materials is different, resulting in different deformation of machine tool bed, spindle, grating ruler, tool rest and other components, thus damaging the original geometric accuracy of the machine tool. Placing the processing equipment at a stable ambient temperature can reduce the temperature difference of each component of the machine tool, thereby reducing the difference in deformation. To sum up, excessive changes in ambient temperature have also become the main source of errors in the processing of precision hardware parts. Excessive temperatures will cause thermal deformation of machine tools, tools and measuring devices, resulting in processing errors and measurement errors. In precision parts machining, vibration has a great impact on machining accuracy and surface roughness. Vibration mainly includes vibration caused by natural external forces, traffic vibration, vibration caused by people walking, and vibration caused by machine tools and equipment. For the above reasons, when we are processing precision hardware parts, the working environment should be clean, vibration proof and constant temperature.    

1、 Basic principles: The acceptance method used shall only accept workpieces that are within the specified dimensional acceptance limits. For workpieces with matching requirements, the dimension inspection shall comply with Taylor principle, and the size of holes or shafts shall not exceed the maximum physical size. Note: Taylor's principle is that for holes and shafts with matching requirements, their local actual size and shape errors should be controlled within the dimensional tolerance zone (shafts are reduced by holes and added). 2、 Principle of minimum deformation: In order to ensure the accuracy and reliability of the measurement results, the deformation caused by various factors should be minimized. 3、 Principle of shortest dimension chain: To ensure a certain measurement accuracy, the links of the measurement chain should be minimized, that is, the measurement chain should be the shortest (to reduce the accumulation of measurement errors). 4、 Closure principle: In the measurement, if the closure conditions can be met, the sum of the interval deviation is zero, which is the closure principle. 5、 Principle of datum unification: The measurement datum shall be consistent with the design datum and process datum.  

  What is customized CNC small batch processing of hardware? In fact, CNC processing plants can process the hardware required by customers according to the drawings and specific requirements of each customer, which is what we often call customized processing with drawings. This customization is not only limited to CNC processing, but also to some post-processing demands of customers. For example, aluminum parts are often sandblasted and oxidized, steel parts are electroplating, blackening and heat treatment, and most copper parts are processed according to the processing state. In fact, there are many such CNC processing plants in China, most of which are located in Shenzhen and Dongguan, Guangdong Province, China, such as Shenzhen Puffitt Precision Products Co., Ltd., which takes CNC processing of small and medium batch parts as the core and accepts customers' customization needs for small and medium batch hardware. This customized processing mode is very suitable for customers to flexibly handle their ongoing start-up projects, and to some extent, it will reduce their concerns about the cost and progress of small and medium-sized projects.  

CNC numerical control processing is also called computer gong. Its main work is to prepare processing programs, and convert the original manual work to computer programming, which can greatly reduce the number of tooling, and the processing quality and accuracy are stable. It is very suitable for processing of multi variety and small batch parts, which is also known as CNC batch processing. The main metal materials applicable to CNC batch processing are: Aluminum alloys include AL 6061 and AL 7075, of which AL 7075 has higher strength and better performance than AL6061. Copper includes red copper (pure copper) and brass, among which red copper has excellent conductivity and weldability, while brass has high strength and outstanding mechanical properties for cutting. There are 45 # steel, 40Cr steel, Q235 steel and stainless steel 303/304, among which 45 # steel has high strength and good machinability; 40Cr steel is widely used in the machinery manufacturing industry,; Q235 steel is a carbon structural steel, which can be directly used without heat treatment; SS303/304 has good processing performance and high toughness. This type of steel can be used to achieve rust prevention. In addition, some commonly used plastic materials, such as ABS, PA, POM and PC, are determined according to customer needs.  

1. The shrinkage coefficient of each material is different, and the plastic mold should have a reasonable shrinkage rate. 2. The plastic mold should have enough rigidity, otherwise it will deform during mold closing and pressure maintaining, causing "flash". 3. If the product is ejected while opening the mold, the ejector page of the injection molding machine can be set (but some injection molding machines do not have this function). 4. Select a reasonable demoulding method, and select a reasonable position and number of ejector pins to ensure that the products are not damaged during the ejection process. 5. The cooling (water passage) in the plastic mold is related to the product size, shape, plastic property, pressure holding time and other factors. 6. Reasonable exhaust position and quantity control shall be selected for plastic mould. Otherwise, the plastic injection will be insufficient and the product will be "short of materials". 7. The fixing method of plastic mold and injection molding machine shall be reasonable, reliable and firm to prevent accidents caused by displacement during mold closing. It shall be easy to disassemble. 8. When there is no return spring, the plastic mold moves with the moving mold part along with the injection molding machine, which means that the mold ejector plate is connected with the machine ejector rod (commonly known as strong ejector). 9. The injection path shall be reasonably selected so that the materials can reach each place evenly (with the same flow path), and there shall be enough storage to ensure that the plastic is replenished during the shrinkage process. 10. The post-treatment of plastic mold materials is not required, because the plastic is soft and does not require any special requirements such as hardness, and the heat treatment process may cause mold deformation. 11. The roughness grade of the plastic mold cavity should reach "mirror level", otherwise, the product is difficult to demould, and the product is damaged due to excessive force required during product ejection. Roughness of locating pin, mold closing surface and other parts are specified in standards.