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Research on Methods to Improve Precision of Mechanical Parts

Mar 09, 2020

1.Geometrical analysis of components

Geometric accuracy is very important for the performance of the component. Inaccurate geometric accuracy may lead to inconsistent shapes and imprecise assembly. Generally, errors in geometric accuracy are caused during the processing in the factory.For example, errors caused by cutting tools during cutting, excessive machine use time, machine aging and other factors will cause deviations in geometric accuracy. The main reason is the machine tool. Due to the long use time, errors will occur in various parts and cause errors to accumulate. Therefore, it is especially important to timely repair and upgrade production equipment.

In addition to the aging of the machine tool, there are also some factors that will affect the accuracy of the parts. For example, the accuracy of each part on the machine tool will also have a significant impact on the processing of the part. To reduce the error in the processing process, you need to Take various approaches to make up. Pausing the processing of parts and replacing machine tools are effective methods. You can also use sensors to measure the effects of parameters such as speed, knife, and feed on the accuracy of processing, and find reasonable processing parameters. To reduce errors. At the same time, machining errors can be offset by adopting various compensation measures.

 

2 Mechanical deformation

turning force reflects the basic characteristics of the grinding process and is an important parameter for the study of the cutting process. It is closely related to the microstructure and performance of the material, the amount of grinding, the characteristics of the tool, the material removal mechanism, the stiffness of the machine tool, and the selection of the cutting fluid. . At the same time, it has an impact on the formulation of turning processes and surface and subsurface damage, and it is also an important index to evaluate the turning quality of materials. The greater the force, the greater the deformation. During the processing of the parts by the machine tool, some external forces are implicitly used on the processed products. This causes the parts to be deformed by external forces, and the manifestation of deformation is the geometric shape of the parts. There are changes.Although these forces do not play a large role in normal production, they often have a great impact on the final production of parts.The remaining forces are enough to make a large change in the accuracy of the final production. Force deformation. In the daily production of parts, we must pay attention to the impact of the residual force of the machine on the parts.

 

3.Force and heat deformation solutions

During the machining process, there are often a lot of external forces that will cause the parts to deform and deform.To solve this problem, it is necessary to continuously reduce the force on the parts. There are two main solutions:

(1) Adjust the system In itself, you can choose to increase the internal bearing capacity of the system. The ability to withstand external forces increases, and the accuracy of parts and components will increase;

(2) Find a solution from the outside of the system to reduce the load. This method has both advantages and disadvantages. The advantage is that it can improve accuracy and reduce errors. The disadvantage is that the cost of production parts is continuously increased. Therefore, the use of this method must control the accuracy of parts and components. economic level. This method has both advantages and disadvantages. The advantage is that it can improve accuracy and reduce errors. The disadvantage is that the cost of production parts is continuously increased. Therefore, the use of this method must control the accuracy of parts and components. economic level. The most ideal state is to meet the accuracy and effectively improve the quality of parts, and to achieve the minimum investment, and strive to obtain the maximum benefits with the minimum investment.


4.During the machining and production of parts, there will be a lot of friction, because friction will generate heat, which will cause a great change in the accuracy of the machine and cause great errors. Thermal deformation, as the name implies, is caused by errors caused by heat during the production process. The thermal deformation of the parts has a huge impact on the accuracy of the parts. However, during the production process, each process causes friction, and each friction generates heat. So in order to reduce the heat and error, the best way is to lower the temperature, cool the machine, and cool down the machine. The accuracy of parts, such as a small part on a machine tool part, will also have a significant impact on the processing of the part. If you want to reduce the error in the processing process, you need to take various compensations. The method can suspend the processing of parts, continue to process with a new machine or a machine that is not damaged, and analyze the data during processing, and reduce the error by reducing or increasing the data to produce parts.

In the process of producing parts, the temperature is continuously reduced, and the machine will not be deformed due to the high temperature caused by friction. There is another way to compensate. Compensation, which makes the tilt relatively smaller, thereby reducing errors and ensuring the accuracy of the parts. At the same time, it is also possible to reduce the number of frictions, so how to reduce the number of frictions has become a key issue. Generally, to reduce the number of frictions, you can reduce the number of collisions between parts and the machine to reduce the heat and ensure the parts. Precision. Another possibility is that the machine tool is too hot for a long time, which causes the parts to be deformed by heat, the machine tool produces errors, and all parts of the machine tool will produce errors. A lot of errors will change the accuracy, so it is necessary to solve the machine tool overheating. The problem can be solved by placing a heat sink on the machine tool, or using cooling liquid in the machine tool to cool down, or extending the distance between the machine tool and the heat source. These are effective solutions to the accuracy changes of parts caused by the machine's heating. method.

 

5.Conclusion

The modern manufacturing industry has put forward new requirements for processing accuracy. Through continuous theoretical and practical research, it is urgent to find a more reasonable processing technology. In mechanical processing and component design, technicians need to continuously improve their technical level and reduce as much as possible. Error, improve the accuracy of machine processing, and improve the economic efficiency of the enterprise.

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