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摘 要
本设计是围绕着防爆盖的机加工艺及工装夹具来展开的。内容主要包括以下几个方面：设计防爆盖零件的加工工艺（包括切削用量工时等计算）设计两套专用夹具，对其中一套进行拆画。作出一万二千字的说明书。
本论文介绍的是防爆盖机加工艺及工装具的设计.金属切削加工时，工件在机床的安装方式有找正安装和采用机床夹具安装两种，成批、大量生产应采用机床夹具安装。夹具是机床与工件之间的连接装置，使工件相对于机床或刀具获得正确位置。机床夹具的好坏将直接影响工件加工表面的位置精度，所以机床夹具设计是装备设计中的一项重要工作，是机加工艺中最活跃的因素之一。专用夹具是指专为某个零件的某一道工序专门设计的机床和工件之间的联结装置。防爆盖的专用夹具分别为加工内圆轮廓的车床专用夹具和加工螺纹孔及攻螺纹的摇臂钻床的专用夹具。
因为工件属于大批量生产，宜采用专用夹紧装置。所以为了适应生产需要，采用CA-6140车床、摇臂钻床专用的夹具。
机床夹具的确定是一项十分重要的设计程序，方案的设计优劣往往直接决定夹具设计的可行性。所以，方案的确定需经充分的研究和讨论来确定最佳方案。
由于液压传动具有许多优点，如结构紧凑，体积小，重量轻，反应快，承载能力大；较易实现无级调速，调速比大；运动平稳；易于实现自动化；并能实现较复杂的自动化工作循环；具有自润滑能力；磨损小，寿命长；液压元件易于实现通用化、标准化，便于大批量生产。所以，本次所设计的车床夹紧方式也可采用液压夹紧。
关键词：防爆盖； 专用夹具； 工艺工装设计
Abstract
This design is centered around the explosion-proof cover the machining process and
fixture to start. Content mainly includes the following aspects: Design of explosion-proof cover parts of the processing ( including cutting man-hour calculation ) design with two sets of special fixture, against which a set for demolition painting.Make twelve thousand word instruction.
This paper introduces is explosion-proof cover machining process and equipment design. The metal cutting process, the workpiece in the machine tool installation way is installed and used for machine tool fixture installation two, batch, mass production should be used in machine tool fixture installation. The machine tool and the workpiece fixture is connected between the device, so that the workpiece relative to the tool or tool to obtain the correct position. The fixture will directly affect the quality of the surface of the workpiece processing position precision, so the machine tool design fixture design is an important work, is the machining process is one of the most active factors. Special fixture is designed for a part of a procedure specially designed. Explosion proof cover fixture respectively circular contour lathe processing fixture and processing thread holes and thread rocker drilling jig.
Since the workpiece to mass production, should adopt the special clamping device. So in order to meet the needs of production, using CA-6140 lathe, radial drilling machine, design of special fixture.
The fixture is a very important design procedure, design quality directly determines the feasibility of often fixture design. So, to determine the scheme of subject to fully study and discussion to determine the optimal scheme.
Because the hydraulic transmission has many advantages, such as compact structure, small volume, light weight, fast response, large bearing capacity; is easy to realize the stepless speed regulation, speed ratio; smooth movement; automation; and can realize the more complex automation work cycle; with self lubricating capacity; small abrasion, long service life; hydraulic components is easy to achieve universal, standardized, convenient mass production. Therefore, this time design of the lathe clamping means may also be used in hydraulic press.
Key words: explosion-proof cover； fixture；fixture design
目 录
摘要 Ⅰ
Abstract Ⅱ
1 防爆盖的工艺分析 1
1.1 防爆盖的作用 1
1.2 防爆盖的毛坯生产类型 1
1.3 毛坯的铸造形式 1
1.4 毛坯精度要求 1
1.5 确定加工余量 1
1.6 确定尺寸偏差 1
2 工艺规程的设计 2
2.1 毛坯的材料及制造 2
2.2 定位基面的选择 2
2.3 工艺路线的拟定 3
2.4 制定工艺路线 4
2.5 工艺方案比较与分析 4
2.6 机械加工余量、工序尺寸及毛坯尺寸的确定 4
2.7 确定切削余量及基本工时 5
3 专用机具的设计 7
3.1 夹具的结构设计 7
3.2 定位误差分析与计算 15
3.3钻床夹具设计 16
3.4夹紧定位误差分析及计算 18
4 结论 20
5 致谢 21
6 参考文献 22
7 附录A 23
8 附录B 32
9 防爆盖实体图 39
