Planet carrier, casting material and heat treatment process
A heat treatment method and casting technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as uneven hardness, stress cracking, deformation, etc., achieve the effect of reducing deformation and cracking, and improving hardness uniformity
Active Publication Date: 2022-04-22
CHINA ERZHONG GRP DEYANG HEAVY IND
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a planet carrier, casting material and its heat treatment process, improve the hardness uniformity of workpieces with large thickness differences, and solve the high performance requirements of materials and uneven hardness caused by product wall thickness differences , stress cracking and deformation and other quality problems
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[0032] The present invention is further described below.
[0033] After the basic processing of the workpiece is completed, heat treatment can be carried out. Quenching treatment is a commonly used heat treatment method. It can improve the performance of the casting material by heating the casting to a certain temperature and then cooling it with a suitable cooling method and rate. The most important control parameters in quenching treatment are cooling rate and final cooling temperature. The cooling rate mainly depends on the cooling method and quenching medium. The cooling rate directly affects the comprehensive mechanical properties of the casting. The control of the final cooling temperature not only determines the type and amount of tissue transformation products, but also determines the magnitude of stress. Excessive stress will lead to cracking or deformation of the product, which may cause quality problems. For workpieces with large thickness differences, although the ...
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Abstract
The invention relates to the technical field of heat treatment of materials, in particular to a planet carrier, a casting material and a heat treatment process thereof. In this heat treatment method, firstly, the workpiece is completely immersed in the quenching liquid to cool, and after the thin part of the workpiece meets the quenching requirements, the thin part of the workpiece is exposed to the liquid surface, while the thick part of the workpiece continues to immerse and cool, and the workpiece enters a semi-immersion quenching state. After the thick part of the workpiece is quenched, the entire workpiece leaves the quenching liquid, and the quenching process ends. Through this method, the optimal quenching time can be achieved for both the thin part and the thick part, and the hardness uniformity of the workpiece can be improved to the maximum extent while the high performance of the workpiece is guaranteed, and quality risks such as deformation and cracking can be reduced. The heat treatment method of the present invention can be widely used in water quenching, oil quenching and other heat treatments of castings, forgings and machined parts with large thickness differences.
Description
technical field [0001] The invention relates to the technical field of heat treatment of materials, in particular to a planet carrier, a casting material and a heat treatment process thereof. Background technique [0002] Quenching is one of the most commonly used heat treatment processes for metals. For workpieces with complex structures and large differences in thickness, conventional quenching and tempering heat treatment methods have quality problems such as unqualified performance, uneven hardness, and product cracking and deformation. If the quenching time determined for the thin part is implemented as a whole, and the liquid cooling time is short during quenching, the quality problem of high final cooling temperature and low hardness of the thick part will occur; and if the quenching time determined for the thick part is implemented as a whole for the workpiece, the liquid cooling time during quenching will be high. If the cooling time is long, the final cooling tempe...
Claims
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IPC IPC(8): C21D1/18C21D6/00C21D9/00C22C38/02C22C38/04C22C38/44C22C38/46F16H57/08
CPCC21D1/18C21D9/0068C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/44C22C38/46C22C38/002F16H57/082C21D2211/002
Inventor 刘显有肖章玉李川马正强程湘张军宝曾国成
Owner CHINA ERZHONG GRP DEYANG HEAVY IND