what is cnc precision？
VAAYoYike manufacturer companyWe are exposed to machining every day, and in the process we often refer to precision. But is your precision correct? Or did you mean "rigorous"? Next, let's get to know those things about precision!
VAAYoYike manufacturer companyVAAYoYike manufacturer companyThe so-called machining accuracy refers to the actual size, shape, position of the surface of the machined part and the ideal geometric parameters required by the drawing! For ideal geometric parameters, dimensional accuracy refers to the average size; shape accuracy refers to absolute circles, cylinders, planes, cones and lines; mutual position accuracy refers to absolute parallelism, perpendicularity, coaxiality, symmetry, etc.
VAAYoYike manufacturer companyVAAYoYike manufacturer company1. Dimensional accuracy: The so-called dimensional accuracy refers to the corresponding relationship between the actual size of the part after machining and the center of the part's dimensional tolerance zone.
VAAYoYike manufacturer companyVAAYoYike manufacturer company2. Shape accuracy: The so-called shape accuracy refers to the degree of the actual geometric shape and ideal geometric shape of the surface of the machined part.
VAAYoYike manufacturer companyVAAYoYike manufacturer company3. Position accuracy: The so-called position accuracy refers to the actual position accuracy difference between the relevant surfaces after the parts are processed.
VAAYoYike manufacturer companyVAAYoYike manufacturer company4. Interrelationship: When designing mechanical parts and specifying the machining accuracy of parts, it is usually necessary to control the shape error within the position tolerance, and the position error should be smaller than the dimensional tolerance. This means that the shape accuracy of precision parts or important surfaces of parts needs to be higher than the positional accuracy requirements, and the positional accuracy requirements need to be higher than the dimensional accuracy requirements.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyMachining error: refers to the deviation between the actual geometric parameters and the ideal geometric parameters. Among them, the size of the machining error reflects the level of machining accuracy, the larger the error, the lower the machining accuracy; the smaller the error, the higher the machining accuracy.
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VAAYoYike manufacturer companyThis paper takes the machining of ultra-precision parts as the starting point, and analyzes the influencing factors of its accuracy in detail, in order to provide a certain reference for related machining work.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyIn manufacturing, a good working environment is an important guarantee for machining quality, and has an important impact on the
machining quality of precision machining and ultra-precision parts.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyIn the actual machining of ultra-precision parts, the dust in the air is larger than the abrasive particles, which sometimes damages the machined surface and affects the machining effect of the abrasive particles. Therefore, air purification before ultra-precision machining is required.
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cnc precision machining requirements for the environment
VAAYoYike manufacturer companyAs a high-precision machining method, cnc precision machining has a high degree of mechatronics and plays an important role in the modern machinery manufacturing industry, which greatly improves the production efficiency of cnc precision machining. As CNC precision machining, it is affected by various factors such as environment, air, power supply, etc. during use. Improper use can easily cause failure of CNC machine tools and affect its normal use and operation.
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1. Requirements for installation location of CNC machining
VAAYoYike manufacturer companyThe installation position of the precision machining machine should be far away from the vibration source, avoid the influence of humidity and airflow, and avoid the influence of direct sunlight and thermal radiation. The workplace should avoid direct sunlight and high temperature environments, and avoid places that are too humid and dusty. In the use of CNC precision machining, a dry and clean site should be selected. Conditional enterprises should place the use of CNC machine tools in an air-conditioned environment as much as possible to maintain a constant room temperature; because my country is in a temperate climate, affected by the monsoon, and the temperature difference is large. , For high precision, it should be used in an air-conditioned room.
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2. Temperature requirements for precision machining
VAAYoYike manufacturer companyThe ambient temperature of CNC precision machining should be lower than 30 ℃, and the relative humidity should not exceed 80%. Generally speaking, an exhaust fan or a cooling fan is installed inside the CNC electric box to keep the working temperature of electronic components, especially the central machining unit, constant or with small temperature changes. Excessive temperature and humidity will reduce the life of control system components, cause more failures, and increase dust, resulting in short circuit boards.
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VAAYoYike manufacturer companyFor example, if a CNC machine tool is installed in a general machining workshop, due to the large changes in ambient temperature, poor use conditions, and various electromechanical equipment, the power grid fluctuates greatly. Keep away from strong electromagnetic interference sources to make the machine work stably. Therefore, the place where CNC machine tools are installed needs to strictly control the power supply voltage. The power supply voltage fluctuation must be within the allowable range and be relatively stable, otherwise it will directly affect the normal operation of the CNC system. If the workshop has a machine tool network management system, the network interface should also be considered.
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4. The gas requirements of CNC precision machining
VAAYoYike manufacturer companyCNC machine tools are composed of electronic components and metal shells. When choosing a workplace, avoid places where corrosive gases exist. Corrosive gases can easily deteriorate electronic components, cause poor contact, or cause short circuits of components, which will affect the normal operation of the machine tool. Avoid the deterioration of electronic components and corrosion of metal parts caused by corrosive gases, which will affect the normal use of CNC machine tools.
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5, CNC precision machining should pay attention to shockproof
VAAYoYike manufacturer companyAs a highly automated and intelligent machine, CNC machine tools should be kept away from the working environment with large vibration, and away from the machinery and equipment that has a vibration impact on it. If necessary, anti-vibration measures should be taken in the workplace to create a good environment for the use of CNC precision machining. workplace. It is necessary to stay away from equipment with large vibration (such as punching machines, forging equipment, etc.), and anti-vibration measures (such as anti-vibration grooves, etc.) should also be used for high-precision machine tools, otherwise it will directly affect the machining accuracy and stability of the machine tool. Poor contact and failure of components will affect the reliability of CNC machine tools.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyIn manufacturing, a good working environment is an important guarantee for the quality of machining, and has an important impact on the machining quality of precision machining and ultra-precision parts.
VAAYoYike manufacturer companyVAAYoYike manufacturer company In the actual machining of ultra-precision parts, the dust in the air is larger than the abrasive particles, which sometimes damages the machined surface and affects the machining effect of the abrasive particles. Therefore, air purification before ultra-precision machining is required.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyUsually, the air purification level of ultra-precision machining must reach 100~10000. Cleaning is the most common air purification method, and the purified machining workshop is called a clean room or an ultra-clean room. Generally speaking, there are two main types of purification,
VAAYoYike manufacturer companyVAAYoYike manufacturer companyOne is the overall purification,
VAAYoYike manufacturer companyOne is local purification.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyLocal purification is economical, and purification is achieved by allowing positive pressure clean air to flow into local machining areas such as the workbench, preventing the inflow of outside air.
VAAYoYike manufacturer companyVAAYoYike manufacturer company Since the hair and work clothes of the staff may bring dust, before entering the work, the staff must clean the outdoor and change the special clothes, and be wet by the wind, so as to effectively avoid the impact of dust on the machining quality.
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Influence of precision machining principle
VAAYoYike manufacturer companyIn recent years, new processes and new machining methods have appeared incessantly, and full attention should be paid to seeking new machining methods.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyIn the traditional machining methods, ultra-precision cutting of diamond tools, ultra-precision grinding of diamond micro-powder grinding wheels, precision high-speed cutting, precision abrasive belt polishing and abrasive machining have played an important role; in non-traditional machining, electron beam, ion Beam, laser beam and other high-energy beam machining, microwave machining, ultrasonic machining, etching, EDM, electrochemical machining and other methods; especially composite machining, such as electrolytic grinding, ultrasonic honing, etc., all have some differences in machining mechanism. Innovative, new machining mechanisms appear, marking a technological breakthrough, often the growth point of new technologies.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyThe breakthrough in the machining mechanism means that the removal machining, combined machining and deformation machining are clearly proposed, especially the presentation of "accumulation" machining represented by rapid prototyping manufacturing, which is a milestone in the thinking of machiningtechnology.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyVAAYoYike manufacturer companyEvolutionary machining principle: Use machine tools whose precision is lower than the workpiece precision requirements, with the help of technological means, special tools, computer technology, sensor technology, etc., to directly or indirectly process the required workpieces. This evolutionary machining principle will affect precision machining and ultra-precision machining，global machining.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyIt can be seen from the above points that the research on machining mechanism is the theoretical basis of precision machining and ultra-precision machining and the source of new technologies. The machining mechanism is the quality of the machining system and the key to the success or development of the machining system.
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The influence of cnc machining tools
VAAYoYike manufacturer companyThe tool in CNC machining is also one of the machining parts. In its own production and machining process, there are geometric errors that affect the accuracy due to the limitation of machining conditions.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyIn the process of tool installation, human operation will also affect the machining accuracy.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyIn the process of use, due to the long-term contact between the tool and the workpiece to be processed, and the deformation caused by friction and high temperature, the tool will also be worn to varying degrees.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyOf course, when the wear accumulates to a certain extent, it will also have a significant impact on the CNC machining accuracy.
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The limit of precision cnc machining
VAAYoYike manufacturer companyIn essence, the purpose of ultra-precision machining is to achieve the machining limit. Over time, with the development of science and technology, this limitation is also changing, requiring long-term exploration and research.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyTherefore, how to adhere to the "principle of evolutionary machining", by using mechanical equipment lower than machining accuracy, using advanced process technology, computer servo, special measuring tools, etc., to directly and indirectly meet production needs, directly affect precision machining or ultra-precision machining parts overall quality.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyObviously, the machining mechanism is the foundation of the machining method, the key to the development of ultra-precision machining technology and theoretical innovation, and plays an important role in the overall effect of parts machining.
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The development of precision CNC machining
VAAYoYike manufacturer companyWith the continuous improvement of manufacturing and machining capabilities, more brand manufacturers will outsource the manufacturing and machining business of precision machining. However, integrating into the supply chain system of brand manufacturers is a long-term and complex process, which requires high technical capabilities, management systems and service levels of parts manufacturers and machining manufacturers. process to mass production. Once the manufacturer and the brand manufacturer form a cooperation, the two sides can easily form a long-term close cooperative relationship, and the manufacturer and the manufacturer can develop together with the development of the brand manufacturer's business.
VAAYoYike manufacturer companyVAAYoYike manufacturer companyThe application industry of precision machining is more extensive. At present, manufacturing and machining manufacturers mainly focus on the supporting machining of parts and components in the electronics, home appliances, automobiles and other industries. In the future, with the industrial upgrading of the manufacturing industry and the further integration of the manufacturing industry into the industrial chain division of the global manufacturing industry, precision machining can be applied to broader fields at home and abroad, such as aerospace, intelligent equipment, rail transit, new energy, etc.
VAAYoYike manufacturer company VAAYoYike manufacturer companyThe degree of automation of manufacturing and machining equipment continues to increase. The automated application of equipment can reduce labor costs, improve product accuracy and stability, and improve production efficiency. With the continuous increase of labor costs, the willingness of manufacturing and machining manufacturers to adopt automation equipment is also increasing.
VAAYoYike manufacturer company VAAYoYike manufacturer companyIndustry concentration continues to increase. At present, precision manufacturing and machining manufacturers are relatively scattered in general, and their technical levels are uneven. With the overall upgrading of the manufacturing industry, manufacturing and machining manufacturers with small scale, backward equipment and slow technological improvement will be gradually eliminated, while manufacturers with a certain scale and strength can gradually expand their market share and enhance their influence in the industry. Eventually build your own brand.
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VAAYoYike manufacturer companyTherefore, in-depth research on the machining mechanism, machining materials, machining equipment and other factors that affect the quality of ultra-precision machined parts is carried out to continuously reduce machining errors and improve the machining accuracy of parts, so as to provide a reliable driving force for the implementation of the development strategy of an industrial powerhouse.
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