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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. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
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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Aluminum tube is a kind of non-ferrous metal tube, refers to the use of pure aluminum or aluminum alloy by extrusion processing along its longitudinal full length hollow metal tubular material. Aluminum profile specifications can be divided into 1024, 2011, 6063, 6061, 6082, 7075 and other alloy brand aluminum profiles.
Aluminum pipe is mainly divided into the following types: 1. According to the shape of the pipe: square pipe, round pipe, pattern pipe, special shape pipe, global aluminum pipe. 2. According to the extrusion method, it can be divided into seamless aluminum pipe and ordinary extrusion pipe. 3. According to the precision: ordinary aluminum tube and precision aluminum tube, the precision aluminum tube generally needs to be reprocessed after extrusion, such as cold drawing, rolling. 4. Divided by thickness: ordinary aluminum tube and thin-walled aluminum tube. 5. Performance: corrosion resistance, weather resistance, wear resistance, light weight. 6. Characteristics: It is a kind of high strength duralumin, which can be strengthened by heat treatment. The plasticity is medium in annealing, hardening and hot state, and the spot welding is good. The machinability of aluminum tube is good after quenching and cold hardening, but bad when annealed. Corrosion resistance is not high, often using anodic oxidation treatment and paint method or surface coated with aluminum layer to improve the corrosion resistance. It can also be used as a mold material.
Aluminum tube is widely used in all walks of life, such as: automobile, ship, aerospace, aviation, electrical appliances, agriculture, mechanical and electrical, home and so on.
Bearing blanking skills
Source: China Bearing Network Time: 2014-03-18