Scraping process for the manufacture of cast iron scribing platforms: The main purpose is one of the methods of plane trimming.The purpose is to reduce the surface roughness value, improve the contact accuracy and geometric accuracy, and thereby improve the machine tool's matching stiffness, Lubrication performance, mechanical efficiency and service life are also the processing techniques necessary for machine tools, equipment, and scribing platforms that are difficult to achieve with surface grinders and rail grinders.
The so-called "scrape grinding" is a combination of two steps of scraping the flat plate and grinding the flat plate. That is, flat scraping—grinding display, then flat scraping—regrinding display, so reciprocating, alternating cycles, continuous operation. The surface roughness value and shape and position error of the cast iron slab are gradually reduced; the contact accuracy and geometric accuracy are gradually improved during operation until the specified requirements are reached.
的刮研工艺需要红色铁粉与柴油或煤油混合搅拌，然后将其色浆滴到平板表面用棉纱搽匀， 研具与铸铁平板经过研磨以后，凸起部分的铸铁平板表面显示的全是黑点，黑点分亮点、浓黑点、淡黑点。 The scrape grinding process of the cast iron scribing platform
requires red iron powder mixed with diesel or kerosene to stir, and then the color paste is dropped on the surface of the flat plate and homogenized with cotton yarn. After the grinding tool and the cast iron flat plate are ground, the surface of the raised cast iron flat plate shows The black dots are all black dots, including bright dots, thick black dots, and light black dots. These black spots are a variable in scraping research. After continuous alternating cycles, the black spots changed from less to dense, and from uneven distribution to uniform distribution. The evolution of black spots is also a process of gradually improving the surface finish, surface contact accuracy, and surface geometric accuracy.
Differentiate the black spots displayed by grinding. For heavy black dots, the size of the tool trace should be the same as that of the rough, fine, and fine stages. The direction of the tool traces should be arranged in the same direction, and gradually scrape until the black dots are completely scraped. After grinding, the black dots were scraped in two directions in a staggered direction and all the black dots were also scraped. It must be pointed out that the cutting marks must be staggered for each round of scraping, otherwise the surface finish will be affected. In the scraping, pressing the bright, thick, and light spots on the black spot should have a light weight, and the bright spot, the large dark spot, and the dark spot should be moderate, and the dark spot should be retained. Do not scrape, and scrape when the next wheel turns black after display. It must be emphasized that the bright spots distributed on the edge and corner of the plane of the scribing platform. Because it is less concealed, it is easily ignored by the human eye and easily leaked. Because the missing scratch point often lifts up the grinding plate during grinding, which prevents the normal display of black dots, the phenomenon of less black dots will be formed.
Scratching of cast iron scribing platform: Scraping of scribing platform is usually called cover surface. The function of scratching is to be beautiful, and the function of accumulating lubricating oil. The common patterns are: diagonal pattern, dove pattern and fish scale pattern. In addition, by observing the completeness and disappearance of the original pattern, the degree of wear of the cast iron scribing platform
after work can be judged.