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首页> 外文期刊>Die Casting Engineer >Venting Design and Process Optimization of Die Casting Process for Structural Components - Part II Venting Design and Process Optimization
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Venting Design and Process Optimization of Die Casting Process for Structural Components - Part II Venting Design and Process Optimization

机译：结构件压铸工艺的排气设计和工艺优化-第二部分

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摘要

This paper is the second of a two-part publication, and presents a practical venting design approach based on the venting efficiency of a die casting process. A general guidance is provided to determine target venting efficiency if there is no similar project experience. The casting ejection temperature is used as a critical temperature compared to the post heat treatment temperature to judge if extra high venting efficiency is required. For the vacuum venting die casting process design, this paper presents a vacuum tank sizing expression as a function of venting efficiency and initial tank pressure before the shot. This paper further presents a modified vacuum pump down time expression to establish the relationship among venting efficiency, vacuum pull time and the maximum venting volume rate of a mechanical valve or chill block. It is recommended that the maximum venting volume flow rate be defined as a standard specification for a given valve or chill block. In order to achieve the target evacuation pull time, lower than Garber's critical slow shot velocity could be used or a plunger "pause" can be introduced like a conventional shot delay occurring just after the plunger tip passes the pour hole. A general constraint set for shot profile optimization of the slow shot phase is presented. Finally the venting efficiency is verified with the venting efficiency analysis method presented in part I of this paper. The effect of leakage on venting efficiency is also discussed.
机译：本文是由两部分组成的出版物的第二部分，并根据压铸工艺的排气效率提出了一种实用的排气设计方法。如果没有类似的项目经验，则可提供一般指导来确定目标通风效率。与后热处理温度相比，将铸件喷射温度用作临界温度，以判断是否需要更高的排气效率。对于真空排气压铸工艺设计，本文提出了真空罐尺寸的表达式，它是排气效率和喷丸前初始罐压力的函数。本文还提出了一种改进的真空泵停机时间表达式，以建立排气效率，真空抽气时间与机械阀或冷却块的最大排气量之间的关系。建议将最大排风量定义为给定阀门或冷却块的标准规格。为了达到目标疏散牵引时间，可以使用低于Garber的临界慢速喷射速度，或者可以像在柱塞头刚经过浇注孔之后发生的常规喷射延迟一样，引入柱塞“暂停”。提出了用于慢镜头阶段的镜头轮廓优化的一般约束集。最后，本文第一部分提出的通风效率分析方法验证了通风效率。还讨论了泄漏对排气效率的影响。

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