The Grinding Crack Problem of GCr15 Steel Billet
Abstract
The occurrence of grinding cracks on the surface of GCr15 steel billet may lead to serious quality problems while manufacturing steel products. By means of scanning electron microscope and energy spectrum analysis, the internal structure of the grinding cracks was observed, the chemical compositions of the grinding cracks were analyzed and the main causes of the grinding cracks were determined. This paper mainly introduces the problem of grinding crack on the surface of GCr15 steel billet, analyzes the main causes of grinding crack and proposes some effective preventive measures.
1 Introduction
GCr15 steel billet is an ultra-high carbon chromium bearing steel for producing high-end mechanical components and steel parts. Its special physical and chemical properties make it ideal for producing high-strength parts and components. In recent years, with the rapid growth of the automobile industry and the rapid development of machinery manufacturing, GCr15 steel billet has been widely used in various sectors. However, due to the complexity of the production process and process parameters, GCr15 steel billet often has grinding cracks on the surface. In the process of further processing and manufacturing, the presence of grinding cracks can lead to serious quality problems, such as cracks, depressions and other defects in the final product. Therefore, the problem of grinding cracks on the surface of GCr15 steel billet should be paid more attention to in the process of steel billet production and processing.
2 Cause Analysis of GrindingCrack of GCr15 Steel Billet
2.1 Analysis of Physical Properties
GCr15 steel billet is a kind of high-carbon chromium bearing steel, with a good combination of harden ability and wear resistance. At the same time, the brittleness and poor plasticity of the steel will increase the defect possibility of the steel during processing. In the grinding process, if the grinding force is too large or the grinding speed is too high, the large amount of cutting force generated by the tool will cause surface cracks. At the same time, when the grinding force is too large, the generated heat of the tool can cause the surface temperature of the steel to rise, further promoting the generation of grinding crack.
2.2 Analysis of Chemical Properties
The content of carbon, sulfur and phosphorus in GCr15 steel billet also has a great influence on the occurrence of grinding cracks. The excess carbon, sulfur and phosphorus content in the steel will cause segregation on the surface of the steel, which will reduce the strength and plasticity of the steel, thus increasing the possibility of grinding cracks. In addition, the excessive content of impurities such as slag and non-metallic particles in the steel may also promote the occurrence of grinding cracks.
2.3 Analysis of Processing Technology
In the production and processing of steel billets, due to the complexity of the process parameters and the poor control of production technology, the long-term heating, cooling cycle, improper sorting of grinding tools and other improper treatment may result in the generation of grinding cracks on the surface of the steel workpiece.
3 Preventive measures
3.1 Control of Raw Material Properties
In view of the influence of the chemical components of GCr15 steel billet on the occurrence of grinding cracks, it is necessary to strictly control the content and components of the raw materials in the production of steel billets, ensure the uniformity and stability of the components of the steel billets, and reduce the occurrence of chemical segregation on the surface.
3.2 Optimization of Processing Technology
In order to reduce the occurrence of grinding cracks on the surface of GCr15 steel billet, it is necessary to optimize the process parameters and optimize the cooling, heating and grinding process to improve the plasticity and surface state of the steel workpiece. In addition, it is necessary to set reasonable cutting amount, speed and selection of tempering temperature and tempering time according to the cutting conditions and cutting tools, so as to minimize the occurrence of grinding cracks.
3.3 Selection of Grinding Tools
The use of grinding tools with good sharpness and wear resistance, such as diamond grinding wheel and CBN grinding wheel, can reduce the grinding force and generate less heat, so as to minimize the occurrence of grinding cracks.
4 Conclusion
In this paper, the problem of grinding cracks on GCr15 steel billet is analyzed, and some preventive measures are proposed. The grinding cracks of GCr15 steel billet are mainly caused by physical and chemical properties, process parameters and selection of grinding tools. Therefore, it is necessary to optimize the processing process and parameters, strictly control the raw material components, and select the appropriate grinding tools.
