摘 要

本設計主要圍繞發(fā)動機曲軸的工藝規(guī)程和專用夾具設計進行研究，其內(nèi)容包括了解曲軸結構，確定曲軸的生產(chǎn)類型，相關的技術要求。在此基礎上，選擇毛坯，確定毛坯的尺寸公差和機械加工余量，繪制毛坯圖。CAD繪制標準零件圖，并在認真詳細分析零件圖后，進行基準的選擇，制定了表面加工方法，劃分加工階段，根據(jù)生產(chǎn)類型確定工序的集中和分散，合理地安排工序，編排合適的工藝路線；進行詳細的大量計算，包括：加工余量、工序尺寸和公差的確定、切削用量的計算及時間定額的計算。從而制定出一套合理的機械加工工藝卡片和機械加工工序卡片。
第二部分的設計是本課題的重點也是難點，主要圍繞專有鉆床類夾具的設計，用臥式雙面中心孔鉆床，為銑斷面打中心孔這道工序設計一鉆床夾具。首先明確夾具設計的主要任務，通過確定定位元件，導向裝置，夾緊機構得出夾具的結構方案，查閱相關國家標準，繪畫夾具裝配圖。
本課題研究的發(fā)動機曲軸應用在汽車發(fā)動機中，
總之，曲軸加工工藝的安排以及專用夾具的設計是一項非常復雜的高難度工作，。它是一種需大批量生產(chǎn)的零件。且技術要求比較高，為了確保產(chǎn)品的質量和水平，設計工作按照科學的程序進行，分清主次，合理取舍。
關鍵詞：曲軸，加工工藝，工藝規(guī)程，制造工藝，夾具











Abstract

The design was studied that was focused on transmission with the shift fork of the protocols and proprietary drilling fixture design, whose contents were included that the use of blades, the blades type of production and the relevant technical requirements. On this basis, the rough was chosen, and the size of the rough was determined, and the mechanical allowances were determined. A rough map was drawn. After carefully detailed analysis of the parts map, the benchmark was chosen, the development of surface processing methods was determined, and the demarcation of the processing stages was divided. According to the production process the type of centralization and decentralization was determined, the process was reasonably arranged, and the order and orchestrates a suitable process line were set up. Then some detail was calculated, such as allowance, processes size and the determination of tolerance. The amount of calculation and the calculation of the fixed time was cut. Thus a set of reasonable card processing machinery and mechanical processes cards were drawn up.
The second part of the design was the focus of this issue which was difficult, who was mainly centered on proprietary drilling fixture design, Z525-use vertical drilling, drilling screw hole design process by which a drilling fixture. Firstly fixture was designed to clear the major tasks identified by positioning components, guidance devices, clamping body fixture structure, access to the relevant national standards, painting fixture assembly.
The study of the subject transmission blades was used in the transmission gearbox shift agencies. Through the design of the transmission plectrum shift gearbox bodies changed stalls, thus it changed the speed of automobile.
This paper transmission plectrum design of technical rules, transmission truly achieved the change stalls and shift function, against drilling fixture design, realization of the drilling screw hole of this procedure.
In short, the design of transmission plectrum was a complex task. It was the typical products in mass production. To ensure the quality of products and the level of design the work must be produced in accordance with the scientific procedure, prioritize, reasonable choice
Keywords: Plectrum, machining, technical rules, manufacturing technology, fixture