带底深孔空心件热成形工艺改进分析

目的研究带底深孔空心件热成形工艺现状与改进措施。方法介绍分析了目前国内外所采用的新工艺、模具结构,新型润滑剂、强制润滑方法,新型模具材料、制造工艺及应用情况。结果采用压型、预冲孔、冲孔、拔伸工艺及模口导向的效果良好,通过高压将润滑剂从冲头内部流向冲孔冲头前端,可实现冲孔强制润滑,模具材料可用3Cr3Mo3VNb,4Cr2MoVNi,3Cr3Mo3W2V等,并采用表面强化等工艺。结论应用表明,上述改进措施可降低壁厚差,改进产品质量,并减小摩擦,降低成形力,比传统材料及工艺显著提高了模具寿命。最后指出了还需进一步解决的问题。

Improvement Analysis of Thermoforming Technology for Bottomed Hollow Part with Deep Hole

Objective The current status and improvement of thermoforming technology for bottomed hollow part with deep hole have been introduced in some papers and patents. Methods New technology and mould structure, new lubricants and forced lubrication, new mould materials as well as manufacturing processes and applications were introduced and analyzed in this paper. Results The results showed that the technology of pressing, pre-pierce, pierce, drawing and installing guiding assembly had good effect on the die orifice. Forced lubrication could be realized by communicating pressurized lubricant to the exterior of a piercing punch. Mould materials of 3Cr3Mo3VNb, 4Cr2MoVNi, 3Cr3Mo3W2V etc. and surface strengthening techniques could be utilized. Conclusion Applications showed that the measures could be used to reduce wall thickness variation, improve product quality, reduce friction and forming load, and improve the mould life compared with the conventional materials and processes. Some problems remaining to be solved were introduced at the end.