锻压技术

一种新型压力机下死点精度预补偿技术

英文标题：A new pre-compensation technology of bottom dead center accuracy of press

单位：1. 宁波精达成形装备股份有限公司 2. 宁波工程学院杭州湾汽车学院 3. 海天塑机集团有限公司

分类号：TG315.5

出版年,卷(期):页码：2024,49(11):120-125

摘要：

压力机下死点精度直接影响制件精度，为提高下死点精度，提出了一种预应力补偿技术，以四柱式顶置油缸400 t高速精密机械传动压力机为研究对象，根据压力机基本结构和四柱顶置油缸产生预应力的特点，使得上横梁向下压，进而实现预补偿作用。基于有限元数值模拟，对压力机机身进行了静力学分析计算，得到了压力机机身在空载及负载240 t时，顶缸压力与下死点位置的变化规律。经实验验证后，基于获得的研究结果开展顶缸压力预补偿下死点的技术应用，即在主轴负载260和300 t下进行模拟计算，并将模拟结果作为指导实践生产时顶缸压力的调整依据。结果表明：顶缸压力预补偿下死点技术能有效提高下死点精度，进而提升制件精度和质量，降低生产成本。

The accuracy of bottom dead center for press affects the accuracy of parts directly. Therefore, to improve the accuracy of bottom dead center, a pre-stress compensation technology was proposed. Taking the 400 t high-speed precision mechanical transmission press with four-column overhead cylinder as the research object, according to the basic structure of the press and the characteristics of the four-column overhead cylinder to produce pre-stress, the upper cross beam was pressed down to achieve the pre-compensation effect. Then, based on the finite element numerical simulation, the static analysis and calculation on the press body were carried out, and the change laws of the pressure of overhead cylinder and the position of bottom dead center were obtained when the press body was unloaded and loaded at 240 t. After the experimental verification, based on the obtained research results, the application of the pre-compensation technology for bottom dead center with the pressure of overhead cylinder was carried out, namely, the simulation calculation was conducted under the spindle load of 260 t and 300 t, and the simulation results were used as the basis for adjusting the pressure of overhead cylinder in practical production. The results show that the pre-compensation technology for bottom dead center with the pressure of overhead cylinder effectively improves the accuracy of bottom dead center, thereby enhancing the precision and quality of parts and reducing the production cost.

基金项目：

作者简介：李伟斌（1973-），男，学士,高级工程师 E-mail：nb-lwb@163.com 通信作者：马娟娟（1981-），女，硕士，工程师 E-mail：563436662@qq.co

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