锻压技术

复杂形状LPG钢瓶阀体锻造加热研究

英文标题：Heating research on forging of valve body for LPG steel cylinder with complex shape

作者：王志辉吴京祥

分类号：TG307

出版年,卷(期):页码：2021,46(3):43-48

摘要：

为了满足液化石油气（LPG）行业对于钢瓶阀门阀体较高的质量要求，从铜锌合金二元相图出发，给出HPb59-1合金在阀体锻造过程中的始锻温度制定原则，并提出了在生产实践中需根据不同批次的元素成分确定具体的始锻温度范围，即：Zn质量分数为41%时，取始锻温度上限为730 ℃、下限为710 ℃；Zn质量分数为42%时，取始锻温度上限为700 ℃、下限为680 ℃；其他Zn质量分数情况下，始锻温度上限值宜采用线性插值方法计算得出，下限值比上限值低20 ℃即可。同时，基于阀体结构复杂、变形量大、温度要求设定准确、毛坯温度要求分布均匀的行业痛点，提出了三段式加热的工艺方法，并按照该工艺方法设计制造了三段式感应加热炉，3个加热段中感应器的长度比为3∶2∶1。最后，通过数学推导以及有限元热仿真模拟出适宜的温度控制条件，同时发现了锻件毛坯表面边界层的温度比实际锻造温度略低的情况。

In order to meet the higher quality requirements of valve body for steel cylinder in liquefied petroleum gas (LPG) industry, based on the binary phase diagram of copper zinc alloy, the setting principle of initial forging temperature for HPb59-1 alloy in the forging process of valve body was given, and it was proposed that the specific range of initial forging temperature should be determined according to the element composition of batch in the production practice. When the mass fraction of Zn was 41%, the upper limit of initial forging temperature was 730 ℃ and the lower limit was 710 ℃, and when the mass fraction of Zn was 42%, the upper limit of initial forging temperature was 700 ℃ and the lower limit was 680 ℃, but the upper limit of initial forging temperature under other mass fractions of Zn should be calculated by linear interpolation method, and the lower limit value was 20 ℃ lower than the upper limit value. At the same time, based on the industry characteristics of complex structure for valve body, large deformation, accurate temperature setting and uniform temperature distribution of blank, a three-stage heating process was proposed, and a three-stage induction heating furnace according to the process method was designed and manufactured with the length ratio for inductor in the three heating stages of 3∶2∶1. Finally, the appropriate temperature control conditions were calculated by mathematical derivation and finite element thermal simulation, and it was found that the temperature of the boundary layer on the surface of forging blank was slightly lower than the actual forging temperature.

基金项目：

王志辉（1973-），男，硕士，工程师 E-mail：715604563@qq.com

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