In China, due to mold materials, processing methods, etc., the life of precision forging dies is not high, and it has been limited in application. By studying the precision forming mold of a motorcycle with claw gear, the author adopts the structure of the new combined mold and the reset processing technology of EDM precision molding, which can effectively improve the service life of the mold and reduce the maintenance cost of the mold.
"Mold structure drawing / precision forging die for a motorcycle with claw gear, Figure /0 is a precision forged part drawing, Figure /1 is its mold structure. In the mold structure, according to the failure of the mold in the working process, The concave mold is decomposed into two parts of 2 and 3. The part 2 is the main body of the concave mold, and the wear is relatively small during the work, and the part 3 is mainly the claw part of the formed product, which is seriously worn and independently formed to facilitate the repair of the mold. And replacement.
3 and 2 are interference fits, 2 and / / are prestressed. The wear of the four jaw cavities during the forming of the part/forming punch 4 is also severe.
It is fixed to 6 by 5 and is screwed for easy replacement and maintenance. The part 7 is a limiting mechanism to prevent damage to the mold caused by over-forming. The forming equipment uses 8599: friction press.
Manufacture of key parts of the mold, structure and material selection of the punch and die inserts. See Figure 6 for the structure of the punch parts. See Figure 5 for the die insert structure. Punches and die inserts are key working parts in precision forging, and steel grades with high toughness, high thermal stability and high wear resistance must be selected. According to the working characteristics of the mold parts, combined with the performance of the current hot work die steel, to improve the strength and hardenability of the matrix, add (A to improve the impact toughness and hot work plasticity, after the heat treatment, the excess carbide is small and fine, and evenly distributed Therefore, 9/6 (A steel has high high temperature strength and excellent thermal fatigue properties, and the life of manufacturing hot work die is long.
Processing of punch and die inserts Punches and die inserts are key parts of the mold, and forging quality, die life, etc. are closely related. The claw gears are currently widely used in gear mechanisms of various motorcycles. This paper mainly introduces the combined structure of the precision forging forming die of this kind of products and the manufacturing process F including the electrode processing G of the claw part. The EDM process with multiple resetting is used to improve the traditional process plan of the mold and effectively extend it. The service life of the mold.
The design of the electrode and the key manufacturing process of the EDM forming of the punch and the die insert are the processing of the jaw portion. Due to the strong metal flow during the precision forging of the cavity portion of the claw, it is easy to wear, which affects the product quality and the service life of the mold. We have considered the combination mold structure that can be repaired many times when designing the mold structure to reduce the maintenance cost of the mold. At the time of mold manufacturing, we designed a combined electrode for the cavity part of the punch and the die insert. The combined electrode of the punch and the die insert is divided into a rough electrode and a fine electrode 1, and the overall structure is similar. The separation of the thick and fine electrodes facilitates the processing quality of the jaw cavity. The roughing electrode is smaller than the thickness of the fine electrode, and the fine electrode is taken in the discharge gap during the EDM process. When the electric spark finishing process is carried out by the numerical control translation function of the machine tool, the surface roughness of the tooth cavity is low after machining, so that the metal can easily flow to the cavity of the tooth part during the precision forging forming. Figure - is the finished electrode structure of the die.
The EDM equipment we use is a precision EDM machine manufactured by Beijing Aqi Company. The device has functions such as automatic alignment center, numerical control translation and circumferential position adjustment. Its automatic centering accuracy is below 6743 for EDM machining after translation.
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