Parts in machinery are machined to form a relatively stable state. Such machining is called surface machining quality, but as the service life of the parts increases, the corresponding working performance is also reduced, and ultimately cannot be used. In the operation process of parts in machining enterprises, corrosion resistance is an important factor in judging the roughness of machined surface parts.
In actual machining, the actual corrosion resistance of parts is proportional to the degree of machined surface. The smaller the surface roughness, the higher wear resistance of parts. The higher the surface roughness value, the worse the surface fit quality, which seriously affects the overall high quality of machining.
1. Analysis of the influencing factors of CNC machining surface quality
A. Parts raw material factors
Raw materials are an important basic part of machining. In the process of machining, whether it is technical conditions or means, if there is a quality problem in the machining materials, it will also have a negative impact on the overall machining work. Therefore, if machining enterprises want to develop in the long run, they must pay attention to the quality of raw materials of parts, and select high-quality mechanical raw materials as much as possible.
B. Influence of cutting conditions
Part machining requires cutting conditions to support its own operation. In addition to raw materials that can affect the work of the machined surface, cutting conditions can also affect the operation of the machined surface. The cutting speed, depth and amount of cutting will affect the quality of the machined surface to varying degrees. For plastic materials, it is easy to produce scales and stubble when processing at medium and low speed, so increasing the speed of surface processing can reduce the scales and stubble. For brittle materials, there is generally no scales and stubble, so the cutting speed will not affect the surface roughness. If the feed speed is continuously increased, the plastic deformation of the material will also increase, and the surface roughness will be also increased accordingly. For this reason, scientifically reducing the feed rate is an important method to improve the quality of the machined surface.
C. Parts machining technology
In addition to the raw material that can affect the quality of the machined surface, the machining technology also affects the quality of the machined surface. Good technology and technical conditions can greatly improve the shortcomings of machining raw materials. However, if the technology is backward, even the best quality raw materials cannot fundamentally guarantee the quality of mechanical parts. Therefore, increasing the grinding and cutting technology of parts is an important condition for improving the quality of the machined surface.
2. Analysis of measures to improve the CNC machining surface quality
A. Improve staff literacy
At this stage, although the machined surface has developed in the direction of intelligence, it is still inseparable from the effective operation of the relevant personnel. In order to meet the market’s demand for the quality of machined surfaces, it is necessary to pay attention to train managers and staff to improve their operating techniques. In the machining of workpiece materials, it is necessary to be consistent with the theoretical knowledge of mechanical processing, and pay attention to the working speed and efficiency of operators.
B. Actively absorb domestic and foreign advanced technology, and carry out development management reasonably
Actively absorb domestic and foreign advanced surface machining and manufacturing technology, advanced production and management concepts, scientific and reasonable management mechanism, technical facilities and personnel deployment system. In the actual use process, it is necessary to pay attention to the integration with its own industry, not to blindly pursue intellectualization and modernization, but to integrate with the market and policies.
C. Pay attention to the management of raw materials
By controlling the source of parts production, select raw material suppliers that are suitable for the development of machining companies. In the early stage of surface machining of parts, the workpiece should be strictly treated to increase the hardness of raw materials, reduce plasticity and refine grains; in addition, factors such as thermal conductivity, plasticity, and thermal stability should be fully considered when selecting tool materials. The choice of tool material should also pay attention to the quality of its diamond material, cemented carbide and high-speed steel.
D. Optimization measures for the quality of the machined surface
There is a direct relationship between the machined surface and product performance. In order to improve product performance, it is necessary to effectively control the roughness of parts during machining. In order to effectively reduce the roughness of the contact surface, we need to optimize the relevant aspects of the machined surface. For example, the secondary declination link, the tool arc radius link and the finishing tool selection link, some parts need to be manually ground, so that the surface roughness of the parts can be controlled in specified range.
3. Conclusion
In a word, the machining surface technology and advanced manufacturing technology play a decisive role in the overall development level of the machining industry, and in the machining surface roughness is the key factor affecting the parts, therefore, it is very meaningful to explore the machining surface quality for machining enterprises.
