North knife handle of double-faced locking of one emperor and BTF

4mm. After knife handle loads main shaft, above all with 7/24 cone centering, broach orgnaization will pull a hammer taut, pull towards the left of knife handle main body move, make below tensile action face of knife handle flange and main shaft end panel are stuck close, form knife handle and main shaft end panel double-faced and close together union. In processing technique of contemporary and mechanical cutting, high speed cutting is alluded increasingly, application of technology of high speed cutting is wider and wider also. Business of production of domestic and international machine tool, tool production business also grows to direction of machine tool of cutting of high speed, high accuracy. Just as its name implies, high speed cutting is rotate speed of tall main shaft above all, main shaft rotate speed should achieve 12000r/min above. On the other hand, it is tall feed speed, the feed speed of 300m/min above. Current, cutting tool uses making synthetic diamond increasingly (PCD) , cubic nitrogen changes boron (CBN) , integral hard alloy, or in the CBN on the besmear on hard alloy, the chemical coating such as TIC, make cutting tool OK the cutting linear velocity that Cheng Aigao amounts to 300-500m/min. Consequently, treatment of high speed cutting has bigger than common treatment 5-10 the cutting speed of times. The biggest advantage is to be able to reduce handling time, improve treatment efficiency significantly, can acquire taller treatment precision and exterior quality. But, high speed cutting also is put in a few problems. Of be the first to be affected is the connection problem between cutting tool and main shaft, achieve when main shaft rotate speed on 10 thousand cutter hub of can serious effect is rigid after turning, produce change to move in axial. High speed treatment asks to ensure condition of the main shaft below high rate and cutting tool coupling cannot produce change. But because leave the action of mental efforts,can expand in taper hole of front of the main shaft when high speed, expand the size of the quantity as rotate radius increases with the accretion of rotate speed, knife handle of standard 7/24 sincere expands the volume is minor, below the tensile action of broach orgnaization, the axial position of cutting tool can happen fluctuant (if pursue 1) , generation axial change is moved. Become when rotate speed is higher, the awl outside inner cone of main shaft 7/24 and knife handle 7/24 can produce bigger gap, at this moment the connection tigidity of knife handle can drop quickly! To solve the influence of this one adverse element, one emperor mixes north in digest the foundation that absorbs Japanese emperor and double-faced locking knife handle to go up, the BTF series that development gave to get used to main shaft of domestic high speed is double-faced system of locking knife handle. One emperor and double-faced locking knife handle use north butterfly reed awl covers a form (see a picture 2) , knife handle design is but the awl with mobile axial covers a construction, the largest mobile amount is knife handle main body: 0.

4mm. After knife handle loads main shaft, above all with 7/24 cone centering, broach orgnaization will pull a hammer taut, pull towards the left of knife handle main body move, make below tensile action face of knife handle flange and main shaft end panel are stuck close, form knife handle and main shaft end panel double-faced and close together union. Graph 2 rotate in high speed when main shaft when, because taper hole of main shaft front happens from the action of mental efforts when expanding, below the action of broach force butterfly reed is compressed further, maintain flange end panel and main shaft end panel to be united in wedlock cheek by jowl. The advantage of structure of this kind of double-faced locking is: 1. Main shaft awl arises to the ministry expands and produce Z to be moved to change because of centrifugal force when eliminating high speed to rotate 2. Raise knife handle tigidity if common knife handle and contrast of tigidity of double-faced locking knife handle express 1 to show. Express 1nextpage3. Improve treatment efficiency, prolong cutting tool life tigidity of treatment of double-faced locking knife handle rises apparently, there is distinct advantage below high speed not only so, there also is an advantage below low speed cutting. Following graphs show common BT50 and milling of handle of BTF50 face milling cutter 3 times workpiece. ■ use machine tool: Vertical MC (MAX4, 000min-1) ■ compare knife handle: BT50 ‐ FMA50.

FMA50 of ‐ of 8 ‐ 75BTF.

8 ‐ 75 ■ cutting condition: S=320min-1 cutting is measured 2.

If result of 5mm experiment cutting expresses 2 to show: Watch 2 from the watch we can see 2 tests data in identical machine tool, identical cutting tool, identical cut ginseng condition, life of cutting tool of knife handle of double-faced locking BT rises than life of cutting tool of common BT knife handle 2.

8 times. And life of the cutting tool below the circumstance of 1 times rises to still compare life of cutting tool of common BT knife handle to grow in feed speed. 4. Reduce main shaft negative charge, raise the surface to machine precision to pursue in order to machine 4 plane are exemple: If experimental cutting result expresses 3 to show: Watch 3 from the watch we can see 3 tests data, below circumstance of identical machine tool, identical cutting tool, load of common BT knife handle is worth wave motion bigger, surface is bright and clean degree coarse. Surface of stability of value of load of knife handle of double-faced locking BTF50, treatment is slick. CNC Milling CNC Machining