Metallurgical manufacturing of steel casting parts has strong adaptability and variability, and different chemical composition and organizational control can be selected to adapt to the requirements of various projects; mechanical properties and serviceability can be selected in a large range through different heat treatment processes, And has good welding performance and processing performance. In addition, the isotropy of the cast steel material and the overall structure of the cast steel parts are strong, thus improving the engineering reliability. Combined with advantages such as weight-saving design and short lead time, it has a competitive advantage in terms of price and economy.
In the investment casting industry, steel castings are the most used castings in the manufacturing industry, and are widely used in equipment, agricultural machinery, machining, and automobile industries. Metal castings can produce parts with complex shapes, but there are also requirements for the design of the product structure. In the case of meeting the requirements of use, it should also try to comply with the casting process. For example, in the structural design, care should be taken not to have thin walls, which may easily lead to dissatisfaction with pouring or product deformation; for example, try not to have sharp corners, try to use radian transitions; and try not to appear small and deep blind holes, It will cause great trouble for foundry sand cleaning. Of course, there are many other structural problems. We will improve and optimize the product structure according to the customer's drawings without changing the customer's functional use, so as to maximize the product qualification rate and production efficiency. In some cases where the structure cannot be changed, we will also perform some follow-up processing after casting according to actual problems, so that the expected results can also be achieved.
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For the design principle and method of the front hob, a lot of theoretical analysis has been done in various professions. This paper only combines the practice of the front hobbing processing of the gearbox gear of our factory, and discusses some reasonable form of stubble and the design of the hob front hob.
There are 12 gears in the automobile gearbox produced by our factory, 11 of which need to be machined. For this reason, we designed the front hob for processing such gears. The amount of the gear of the gearbox is evenly distributed along the tooth surface. However, for the gear with few teeth, the root cutting phenomenon has been serious. For example, if the angle is used, the root of the gear is too large. The effective involute length is too short, which will seriously affect the quality of the meshing. In response to this situation, we used a non-antennat tooth profile, which consists of a straight line of 15, 20°, 32~33 straight lines, of which 20 straight part is tangentially effective involute meshing part; 32 ~33 straight part is rolling The trimming part of the tooth top of the gear is cut; 15 the straight arc portion of the straight line and the top of the tooth hobbing the root arc and the undercut portion. The cutting trajectories of each part are designed as required.
The gear shaving hob designed by the above method can effectively solve the processing problem that cannot be solved with the tentacles before the shaving. As shown, when the effective involute starting point F is close to the base circle, the tooth shape cut by the shaving hob is as shown by the thick solid line, and the shaving cutter is shaved as shown by the dotted line, the shaving cutter The top basically falls on the maximum point of the undercut arc, and the shaved tooth shape does not appear or only a small amount of undercut phenomenon, which can better meet the use requirements.
1 Sichuan Machinery Industry Bureau. Complex tool design manual. Mechanical Industry Publishing 2 Yuan Zhejun and so on. Gear cutter design. New Era Press, 191983 Optimized design of the non-angled shaved front hob. Machine tool, root cut analysis of the 1996 (8) 4 shaving hob. Tool Technology, 1987 (9) Editor: Shi Ming
