锻压技术

GH4169合金十二角头螺栓热镦成形数值仿真及参数优化

英文标题：Numerical simulation and parameter optimization on hot upsetting for GH4169 alloy dodecagonal head bolt

作者：汤涛王熔

分类号：TG311

出版年,卷(期):页码：2021,46(12):20-26

摘要：

为优化GH4169合金十二角头螺栓的热镦成形参数，减少过热过烧、折叠、裂纹、模具开裂等问题。对热镦成形关键参数（坯料加热温度、镦制速度、摩擦因数）建立了正交实验优化方案，并建立了GH4169合金十二角头螺栓热镦成形的Deform3D数值仿真热力耦合模型。并对镦制力、损伤值、等效应力、等效应变进行了多目标优化。得到的优化后的热镦成形参数为：坯料加热温度为1020 ℃、镦制速度为300 mm·s-1、摩擦因数为0.3。与原有热镦成形参数相比，热镦载荷、零件损伤值、等效应力、等效应变、镦制速率均有所改善，提高了成形质量和效率。生产实践结果表明：模拟结果与实际生产结果吻合性好，产品质量改善良好，微观检查无裂纹、折叠、缺损等缺陷，金相等级均符合技术要求。

To optimize the hot upsetting parameters of GH4169 alloy dodecagonal head bolts and reduce the problems of overheating and overburning, folding, cracking and mold cracking, an orthogonal experimental optimization scheme was established for the key parameters of hot upsetting such as billet heating temperature, upsetting speed and friction factor, and a Deform-3D numerical simulation thermal coupling model for the hot upsetting of GH4169 alloy dodecagonal head bolt was established. Then, the multi-objective optimization of upsetting force, damage value, equivalent force and equivalent strain was carried out. The optimized hot upsetting parameters are the billet heating temperature of 1020 ℃, the upsetting speed of 300 mm·s-1 and the friction factor of 0.3. Compared with the original hot upsetting parameters, the hot upsetting load, damage value of part, equivalent stress, equivalent strain and upsetting rate are improved, and the forming quality and efficiency are improved. The production practice results show that the simulation results match well with the actual production results, the product quality is improved well, there are no defects such as cracks, folds, defects etc. in the microscopic inspection, and the metallographic grade meets the technical requirements.

基金项目：

企业级攻关项目基金（T21012，K21029）

汤涛（1985-），男，硕士，工程师 E-mail：nbvcx163@163.comGH4169

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