底盘座压铸件和模具设计【毕业设计】

发布日期:[11-03-25 17:37:32] 浏览人次:[]

摘 要

压力铸造是目前成型有色金属铸件的重要成型工艺方法。压铸的工艺特点是铸件的强度和硬度较高,形状较为复杂且铸件壁较薄,而且生产率极高。压铸模具是压力铸造生产的关键,压铸模具的质量决定着压铸件的质量和精度,而模具设计直接影响着压铸模具的质量和寿命。因此,模具设计是模具技术进步的关键,也是模具发展的重要因素。

根据零件的结构和尺寸设计了完整的模具。设计内容主要包括:浇注系统设计、成型零件设计、抽芯机构设计、推出机构设计以及模体结构设计。根据铸件的形状特点、零件尺寸及精度,选定了合适的压铸机,通过准确的计算并查阅设计手册,确定了成型零件以及模体的尺寸及精度,在材料的选取及热处理要求上也作出了详细说明,并在结合理论知识的基础上,借助于计算机辅助软件绘制了各部分零件及装配体的立体图和工程图,以保障模具的加工制造。

根据有关资料,采用扁平侧面浇注系统,降低了浇注时金属液对型芯的冲击,确定了铸造工艺参数:铸件加工余量取0.1~0.75mm,收缩率为0.4~0.7﹪,脱模斜度为25′~45′。模具整体尺寸为900×640×835mm,符合所选压铸机安装空间。抽芯采用斜滑块机构,拼合形式为两瓣式。推出机构采用4根端面直径26mm的圆截面推杆,推杆兼复位杆作用。经计算,推杆受力符合要求。通过电脑模拟显示,模具能够正常工作,开启灵活。

关键词:压力铸造;压铸模具;锌合金铸件;底盘座

Abstract

Die-casting molding technology is playing a key role in non-ferrous metal structure forming processes. Die-casting process’s features are the strength and hardness of die casting on high, thin-walled castings with complex shape can be cast, and the production is efficient. The die-casting die is the key for the process of die casting, its quality decides the quality and accuracy of castings, and the design of the die-casting die affects its quality and operating life directly. Therefore, designing the die-casting die is the key to technological progress; it is also an important factor in the development of mold.

Based mainly on parts of the design integrity of the structure and size, it scheme out the required spare parts. Design elements include: design of gating system, forming part design, core-pulling mechanism design, the ejector design and the mold body structure design. According to the shape of features , parts size and accuracy, the author selected the appropriate die casting machine, through the exactly calculate and consult design handbooks, confirm the size and accuracy of the forming part and mold body structure, it also makes particular instruction on the material selection and the requirements of the heat treatment, with theoretical basis, plotting out pictorial drawing and casting drawing of the parts by using computer software to ensure the manufacture of die-casting die.

Based on the datum, use flat side gating system which can reduce pouring molten metal on the impact of cores, it ensure the technological parameter of the mold: the allowance of the casting was 0.1~0.75mm, shrinkage rate was 0.4~0.7﹪, draft angle was 25′~45′. The size of the die-casting mold was 900×640×835mm, which satisfy the space of the die casting machine which is chosen. The core-pulling mechanism of the mold w

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本文关键字:底盘座  压铸件  压铸模具  设计  毕业设计
本文所属专题:毕业设计论文 
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