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Bearing blanking skills
Source: China Bearing Network Time: 2014-03-18
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Cutting is the first process of casting. The unevenness of the quality of the blank, that is, the accuracy of the component and scale, the shape of the section, etc.; will directly affect the quality of the casting process and forgings.
Foreign bearing occupations have many casting production lines such as high-speed upsetting machines, flat forging machines and side-station multi-station presses; these production lines directly cast bearing rings with bar stocks; therefore, the number of blanks is relatively small. Several precisions and component precisions of progressive material cutting; one is to carry out radial compaction on the bar material; the other is to improve the shearing speed. Moreover, the foreign cutting equipment is highly active; usually it has the loading and unloading, feeding and active cleaning. Head, active monitoring and other equipment.
Because the traditional method of cutting is basically open shearing; the quality of the blanking is poor; the difference of the component is about 5%; the inclination of the end face is much larger than 3°. Therefore, various domestic manufacturers are exploring some new methods.
Regarding the majority of domestic manufacturers; usually using a single-point press cooperative grinding tool for shearing and cutting; thus; many favorable work in the improvement of abrasive tools, the quality of the blanking is mainly due to the bar material when shearing The effect of axial turbulence and warping; for this purpose; a sleeve-type shearing die is presented. Even if the shape of the cutting and moving blades is the same as the shape of the cross-section of the bar; the warpage of the bar during the binding shear The flattening of the bar when the bar is sheared; the shear quality is significantly improved. In practice production; the difference in the cold material can be controlled at 1%; the crushing depth is 0. 5mm; the end face inclination is less than 2°30 ', about the difference between the hot material component is within 2%; the inclination of the end face is less than 3°. The restraining shear mode. That is, the warpage, axial turbulence and severing of the bar are made by the method of radial rushing. Some methods are hurried at the fixed end; some are hurry at both the fixed end and the movable end; the quick method is cylinder type; there are also tissue linkage. The blades are selected and the cross section of the bar Shape of the same shape; in addition; this type of abrasive can also be equipped with active feeding equipment. This method Cutting component difference may be controlled within 1%; section smaller than the inclination of 2 °.
The use of bar hot cutting machine is also increasing; basically it is operated in the production line mode. It adopts medium frequency induction heating, active feeding, active feeding, (with additional) active detection, etc.; high degree of automation; The machine has the functions of radial rushing equipment, good rigidity of the fuselage, active adjustment of the material, etc. The shearing quality is also much improved compared with the old shearing machine; the shear component error can reach no more than 1.5%; The inclination is within 3°.
The band saw blanking is a foreign product; it has been used in China. Because the band saw uses a highly rigid layout; the guiding of the guide rail is firm, the feeding control ensures the low speed stability and the cutting force in the operation, and the bar is fast and secure. Then; The blanking component is accurate; the end face quality is good; and the blanking scale is wide.
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