资源描述
附 录Hole processing technological development trendIn the machine parts processing work, the hole processing accounts for the proportion quite in a big way, with high speed vi state similar is high speed, the high accuracy drills truncates the processing to propose the agenda, the high efficiency hole processing regarding urges the spare part rationalization of production is the indispensable important technological process. In recent years, the spare part production mostly used take the CNC engine bed as the central production shape, when carried on the hole processing, also mostly used the processing center, the CNC electrical finishing tool and so on the advanced equipment. Regardless of which domain hole processing, the realization high accuracy and is high speed all is obtains the user order form the important competition method.The high speed hole processing uses the processing center (MC) conditionThe realization hole processing high speed precondition is must use the high speed processing center, but the engine bed is high speed must satisfy the following condition.1. Provides high speed rotates the main axleThe drill bit and the end mill equally have the central tooth, because nearby the central tooth has one kind of circumferential velociy, therefore, cutting speed to high speed development time, the main axle rotational speed also must realize high speed. Specially when use minor diameter drill bit, the main axle is high speed is essential. From now on, along with the hole processing high speed progress, estimated the rotational speed will reach 30,000 100000r/min the main axle demand unceasingly to increase. At the same time, because achieved the stipulation the high speed rotation needs the time to be very short as well as to request Z the main axle swinging radius to be supposed to control to (drill bit direction of cut) in the most mild degree, therefore, the high speed main axle disposition is the realization high speed high accuracy hole processes the essential condition.2. May move partially has Moved quickly the functionThe main axle and the work table and so on may move partially should reduce the weight as far as possible, realizes the movement quickly to melt, this also carries on the condition which the high speed hole processing must have. 1 hole process period only needs several seconds, therefore, must reduce between hole and hole the tool time of travel, this realizes the high efficiency cutting key question, solves this question way first namely for to be possible to move the part the movement to have to be nimble quickly. For example, even if has achieved the high accuracy pointing accuracy, but like the engine bed may move the partial movements insufficiently keen quickly, also is impossible the realization high speed hole processing request which satisfies the current user to propose. Usually is (the G value) judges the engine bed with the acceleration characteristic to be possible to move the partial quick performance, when G=0.8 1.5, may judge this engine bed for to have the highly quick performance the processing center.3.The work table and the engine bed overall area proportion should be smallerMove quickly as the processing center users, they hope workstations and workstations outside of the space occupied by some as possible. Particularly Kong processing these costs are higher and lower value-added processing area, the best use of that structure tight processing center. If Japans high-speed physical-chemical testing of CNC milling machine Institute, the scope for 300mm2 processing, machine tools identity covering 950mm2, machine tools covering about three times the size of her biggest chain, the whole structure rather tight. 45000r/min rotational speed for the main axis milling machine, a high-speed machines can. XY axis orientation for mobile structure (workstations only Z axis movement), its acceleration characteristics value G=1.5 that the quick action of a machine tool functions.4. The main axle may directly supply the refrigerantIn drills truncates in the process, processes L/D (bits Kong diameter and deep over) to have specially to pay attention to the row of filings question in 5 above hole, best selects the belt for the oil hole drill bit, in order to carries on the stable processing. Uses by the main axle center supplies refrigerant way, regarding replaces the clamping apparatus the locking bolt then is more convenient.5. Has the hole processing to insert with the CNC tool makes up the functionThe CNC cutting characteristic lies in may carry on the inspection tool path the reasonable processing, when carries on the CNC machining to the hole, may use the spiral cutting, high walk knives,to cuts and so on the tool inserts makes up the way, has these functions the CNC control system to be possible to perform in the hole processing to apply.
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