孔的工艺（Hole process）.doc

孔的工艺（Hole process） Holes in the process,.Txt no pain in the wound, and only those who shed blood but smile, sometimes the simplest advice to others is the most difficult to do. Hole craft,.Txt know how to let go of people find easy, know how to forget people, find freedom, know how to care for people find happiness! The wisdom of a woman is to admire the intelligence of a man. Life is a lamp, work is an oil, and if it needs light, go for it! Love, fly to the horizon, feel steadfast, because of your concern; after breaking up, sitting at home feel weightless, because there is no direction. Hole processing and its accuracy, 2007, 01, Monday, 29 am 09:04, drilling 1. process characteristics 1) drilling is the method of roughing holes; 2) machining diameter of 0.05 ~ 125mm hole; 3) the dimension accuracy of the hole is below IT10; 4) the surface roughness of the hole can only be controlled at Ra12.5 mu m. For high precision holes, such as bolt through hole, hole and threaded hole, can be directly used for drilling. Two, reaming Process characteristics 1) reaming is the half finishing method of hole; 2) the general machining accuracy is IT10 to IT9; 3) the surface roughness of the hole can be controlled from Ra6.3 to 3.2 mu m. When drilling DW 30mm diameter hole, in order to reduce the drilling force and torque, improve the quality of hole, general use (0.5 ~ 0.7) DW sized drill out hole, then drill reaming, can keep good control precision and the surface roughness of the hole, and productivity than the direct use of a bit out even higher. Three reaming The essence of reaming process Reaming is not only a cutting process, but a combined process of cutting, scraping, extruding, ironing and friction. Reaming amount 1) the margin of reaming is 0.10mm to 0.35 mm, and the margin of fine reaming is 0.04mm to 0.06mm. 2) cutting speed and feed rate, reaming speed is 1.5m/min to 5m/min; when reaming steel parts, the feed amount is 0.3mm/r to 2mm/r; the amount of feed is 0.5mm/r