Surface Quality Control Measures of Machined Parts

Abstract: This paper first analyzes the reasons that affect the surface quality of machined parts one by one, and on this basis, starting from personal experience, constructively puts forward the corresponding control method for the surface quality of machined parts. Hope that through this exchange of experience, this article can bring some valuable reference for the staff engaged in related industries, and hope that this article can play a valuable role.

Key words: machining parts; processing;

Since the reform and opening up, China's economic level has been rapid development, the level of mechanization into the degree gradually improved, all kinds of machinery and equipment in China has been widely used. In this context, the Chinese people have higher requirements for the processing quality of mechanical equipment parts, and there is a very close correlation between the quality of each component and the quality of the mechanical equipment. Therefore, the relevant technical personnel in the process of machining the surface of the parts, should take effective quality control measures to ensure that the parts produced meet the relevant quality requirements, so as to make their own sustainable development.

Analysis of the Influence of 1. on the Surface Quality of Machined Parts

Machined parts of the surface quality, often with the overall quality of the parts have a very close correlation, if the surface quality of mechanical parts can not be guaranteed, will be in the process of mechanical operation, produce many problems. Understanding and understanding the common mechanical parts of the surface quality problems, to enhance the overall quality of mechanical parts, has a direct link. Combined with personal experience, this paper believes that the main reasons for the surface quality problems of mechanical parts are the following two aspects.

1. The influence of surface roughness of machined parts on the quality of parts. In the machining parts, the roughness of the surface of the parts will have a direct impact on the quality of the parts, analysis of the reasons for the difference in roughness, mainly because of the characteristics of the mechanical parts processing materials and the amount of material used in the cutting operation. If the mechanical parts in the production process, there are differences in the quality of the material, it will directly have a decisive impact on the quality of the mechanical parts produced. For example: if the mechanical parts in the production process, the material used is a plastic material, so in the process of processing operations for the tool, it is easy to appear plastic deformation phenomenon, and because in the process of cutting operations, but also on the parts produce tear separation effect, so the roughness of the surface of the parts will be increased. The more excellent the toughness material of the selected mechanical parts material, the more severe plastic deformation will be produced in the process of parts processing, resulting in the rougher surface structure of the parts. And if the selected mechanical parts material is brittle material, in the process of cutting the parts, these materials will show small particles, which will also increase the surface roughness of the mechanical parts themselves. In the process of parts processing, the amount of cutting used will also affect the roughness of the surface of mechanical parts. For example, the raw materials of mechanical parts made of brittle materials will not have high requirements on the speed of cutting operations during the processing. In the process of production and processing for plastic material parts, if the depth of the cutting operation surface is low, the roughness of the surface of the parts will be improved to a certain extent. The degree of influence of the grinding operation on the roughness of the part itself is influenced by the mathematical geometry theory and the plastic deformation of the metal material on the surface of the part. In the process of grinding operation, the particle distribution and running speed of the grinding wheel will have a certain influence on the roughness of the surface of the part.

2. Machined parts surface mechanical impact on the quality of parts. Many mechanical experts believe that the physical and mechanical properties of parts are another important factor in measuring the quality of parts. The reasons for the impact on the mechanical properties of the surface of the parts are diversified, which means that the reasons for the impact on the mechanical properties of the surface of the parts are diverse. First of all, some external factors cause the surface of the machined parts to harden, the cutting speed of the parts and the choice of cutting tools are not careful, the same will make the mechanical properties of the surface of the parts is not ideal, which has a serious impact on the quality of the parts. In addition, some external reasons cause the surface structure of the parts to change during the machining process. For example, after the temperature exceeds a certain level, the metallographic structure of the metal material itself will change to a large extent, resulting in The strength and hardness of these parts cannot meet the relevant quality requirements as parts when they are put into production and use. And in the process of using parts, there is a high possibility of cracks, which is called "grinding burn" by the industry staff ". After * * *, in the process of machining parts, the surface will produce residual stress, this is because technicians in the process of cutting parts, inevitably produce a certain degree of plastic deformation, resulting in a significant increase in the specific volume of metal on the surface of the parts. At this point, the volume of these parts themselves will be significantly increased, and some residual stress will appear in the surface metal of the parts. This has a huge impact on the quality of parts, especially for many small parts, this effect is often very fatal.

The Control Means of 2. Machining Parts Surface Quality

From the above analysis, it is not difficult to find that the surface quality of the parts has a great influence on the performance of the parts themselves. In many cases, the more precise the part, the higher the requirements for its surface quality will be. Therefore, the surface quality control in the machining of parts is an important issue that all technicians in the industry must think about.

1. Formulate scientific parts machining technology process. The influence of the processing technology of the parts on the overall quality of the parts is self-evident. At present, because the machining process of the parts cannot meet the relevant requirements of the surface quality standard, and there are also human causes that affect the surface quality of the mechanical parts. In the process of machining, the surface quality of the knowledge parts cannot meet the relevant industry standards. Based on this situation, should develop effective and reasonable parts machining process specification, in order to solve this problem. First of all, the machining time for the parts must be short, too long processing time is likely to have a bad impact on the parts, and before the parts are processed, the quality of the parts needs to be positioned. Only in this way can we produce sufficient and qualified parts at one time in a short time.

2. Correct selection of parameters for cutting operations. In the process of machining parts, the cutting parameters set by the technicians often have a very significant impact on the surface quality of the parts. Unreasonable parameter selection will greatly improve the surface roughness of the processed parts and reduce the overall quality of the parts. Therefore, before the cutting operation is carried out, the technician must ask you to make reasonable settings for the parameters of the machine, such as the degree of the rake angle during the cutting operation. If the degree of the rake angle increases, the cutting force will be reduced, but it will also reduce the deformation of the parts generated during the cutting process. Another is in the cutting process, the rational use of cutting fluid, in order to reduce the friction between parts and tools. This will greatly reduce the temperature of the parts during the cutting operation, so that the quality of the machined parts is better guaranteed.

3. Select the corresponding tool according to the material feature. The reasonable choice of props has a great influence on the surface quality of the parts, and the reasonable selection of tools can play a significant control effect on the surface quality of the parts. In this process, the operator must pay attention to the fact that the more expensive the tool is, the better the effect is in the process of cutting the part material. Choosing the right material can not only save a lot of economic costs for enterprises, but also make the cutting operation effect better.

4. The processing procedure arrangement is scientific. The correct processing sequence also has a very important influence on the surface quality of the parts. Therefore, in the process of surface processing of the parts, the technicians need to arrange the machining sequence scientifically according to the material and performance characteristics of the parts. This can effectively reduce the probability of the occurrence of residual stress in the processing of parts, and ensure that the parts are put into use after the harvest to a more ideal effect.

3. epilogue

The normal operation of machinery can not be separated from the help of parts, so parts for machinery has a very important role, and the surface quality of parts for the performance of parts, but also has a decisive role. Based on this background, this paper analyzes the reasons that may affect the surface quality of the parts in the process of machining parts, and puts forward the relevant corresponding measures constructively. Hope to be able to give the industry related technical personnel to help, for China's economic construction and development, contribute to their own strength.

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