基于数控加工模样的汽车覆盖件铸钢模具消失模铸造工艺探索

发布时间：2018-03-31 19:15

本文选题：消失模铸钢件　切入点：汽车覆盖件模具　出处：《华中科技大学》2015年硕士论文

【摘要】：采用消失模铸造工艺生产内外质量兼优的铸钢件一直是一大难题。在消失模铸钢件实际生产中,由于很难控制模样分解速率及产物的排除速率,使二者相匹配,故模样及其分解产物极易卷入金属液中形成渣气孔;且EPS深度分解时产生的碳与金属液相互作用使铸件增碳,铸件表面增碳后,使得铸件硬度增加,给机械加工带来困难,铸件的焊接性能变差,局部地方的力学性能因增碳而改变。本课题紧紧围绕如何生产出高质量的铸钢件而进行了系列研究。为降低铸钢件的生产成本、提高效率、改善工作环境,依据龙岗铸造有限公司生产纲领及现有条件,设计了一条简易的干砂负压消失模生产线以逐步替代原有的树脂砂实型铸造生产线,并对相关生产细节进行了规范,协助工作人员铸造出了合格的铸钢件,在此线上能高质量地稳定生产铸件。首先,泡沫模样的表面质量决定着铸件的表面粗糙度和尺寸精度,是获得优质铸件的前提条件。通过探讨高质量的泡沫模样材料的选取,数控加工参数以及专用泡沫刀具的选择等影响因子的研究,采用新型数控加工的方法成功加工出的汽车覆盖件模具泡沫模样与传统方式加工的模样相比,模样的质量大大提高。其次,提高消失模铸钢件的内在质量一直是国内外铸造工作者的难点。在消失模铸造生产线上,将先烧后浇工艺运用于较复杂的汽车覆盖件模具铸钢件生产上,采取了诸多辅助工艺措施避免了极易出现的塌箱问题,成功地铸造出了高质量的汽车覆盖件模具铸钢件:尺寸精度高、表面少无增碳、机加工区域无内在缺陷。
[Abstract]:The steel casting production and quality excellent technique of EPC is always a big problem. In the disappearance of steel castings in practical production, because it is difficult to control the appearance of the decomposition rate and product removal rate, make the two match, so the appearance and its decomposition products easily entrapped into the liquid metal in the formation of slag hole; and EPS the depth of the decomposition of carbon and metal liquid interaction make casting casting surface carburizing, carburizing, making casting hardness increase, difficult to machining, casting welding performance variation, mechanical properties due to local carbon change. This topic focus on how to produce high quality castings and conducted a series of studies the production of steel castings. In order to reduce the cost, improve efficiency, improve the working environment, according to the Longgang Casting Co. Ltd. production program and the existing conditions, the design of a simple negative pressure loss of dry sand mold production Line to gradually replace the original resin sand mold casting production line, and the related production details of the specification, assist the staff cast steel castings qualified in this line, high quality and stable production of castings. First of all, the surface quality of the foam pattern determines the roughness and dimensional accuracy of the casting surface, is a prerequisite to obtain the high-quality casting. Through the discussion about the selection of high quality foam materials, CNC machining parameters and tool selection of special foam impact factor research, compared to processing mold foam and the traditional way of using a new type of NC machining method of processing automobile appearance, appearance quality is improved greatly. Secondly, to improve the internal quality of steel castings disappeared at home and abroad has been difficult in foundry workers. EPC production line, the first burn after pouring technology is applied to more complex Many auxiliary technology measures have been taken to avoid the collapse problem of automobile panel dies for casting steel castings. We have successfully produced high quality steel castings for automobile panel dies: high dimensional accuracy, less surface carbon and no inherent defects in machining area.

【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG249.6

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