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图1为ND5气缸盖下体零件图。为将气缸盖上、下体焊接起来,需在下体上加工出4-φ29.77 × 15°焊接坡口。原工艺是:①钻模钻铰4-φ21.5H7;②在车床的专用工装上分别以4-φ21.5H7孔定位加工4-φ63.5孔;③在另一车床的专用工装上分别以4-φ63.5孔定位加工4-φ29.77 × 15°坡口。分析整个零件的加工工艺,发现 4-φ63.5孔是为加工4-φ29.77 × 15°坡口而专门加工出的工艺孔。这样,为加工4-φ29.77 × 15°坡口需占用两台配备专用工装的C630车床,加工4-φ63.5孔需装夹4次,加工4-φ29.77 × 15°坡口又需装夹 4次,在车床上总计需装夹8次之多。由此可见,该工艺费工、费时,工人的劳动强度太大,且占用设备较多。
Figure 1 shows the ND5 cylinder head lower body parts. In order to weld the cylinder head and the lower body, a 4-φ29.77 × 15 ° welding groove needs to be machined on the lower body. The original technology is: ① drill drilling hinge 4-φ21.5H7; ② special tooling on the lathe respectively with 4-φ21.5H7 hole positioning processing 4-φ63.5 holes; ③ in another lathe dedicated tooling to 4-φ63.5 hole positioning processing 4-φ29.77 × 15 ° bevel. Analysis of the entire part of the processing technology and found that 4-φ63.5 holes for processing 4-φ29.77 × 15 ° bevel and processing holes specially processed. In this way, in order to process 4-φ29.77 × 15 ° beveling, it takes two C630 lathe equipped with special tooling, machining 4-φ63.5 hole to be installed 4 times, machining 4-φ29.77 × 15 ° bevel Need to clamp 4 times, in the lathe total need to install as many as 8 times. This shows that the process of labor-intensive, time-consuming, labor-intensive workers, and occupy more equipment.