Mould of high speed, expensive precision work establishs milling cutter with CBN

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  • source:CLAREY CNC Machining
Graph 1 BNBP CBN establishs milling cutter to pursue the cutting mechanism mode of two kinds of 2 cutting tool in recent years, the high speed of machining center machine tool changes the high speed that promoted mould treatment greatly. Inchoate, high-speed steel establishs the mainstream cutting tool that milling cutter is mould treatment; After revolution of machine tool main shaft exceeds 10 thousand to turn, coating hard alloy establishs milling cutter predominate to machine cutting tool; Nowadays, highest revolution amounts to main shaft the 60 thousand machining center machine tool that turn begins 4 ～ popularize application, CBN establishs milling cutter to will make the mainstream cutting tool that the mould machines. Mould of treatment of the high speed that friendly electrician introduces to exceed hard data company to produce below, high accuracy establishs milling cutter with BNBP CBN (1) seeing a picture. The cutting mechanism that 1 BNBP CBN establishs the characteristic BNBP of milling cutter CBN to establish milling cutter and the hard alloy previously establish milling cutter to differ (2) seeing a picture. Sharp cutting blade is used commonly when hard alloy establishs pattern of milling cutter milling, and the cutting mechanism that BNBP CBN establishs milling cutter is to use passivation cutting blade, undertake like accurate grinding milling is machined in that way, because this is in below low speed condition when treatment,cutting fights force bigger, develop cutting tool property adequately hard, but when tall hardness steel is processed below high speed condition, can show the dominant position with cutting tool long service life not only, return the face of high grade treatment that can gain high accuracy. The cutting blade that has the part before be being lost greatly is BNBP CBN the main factor that cutting tool establishing mill has sex of blade of Gao Kang collapse to be able to gain good treatment face. BNBP CBN establishs milling cutter to have the following advantage: ① has the property of blade of Gao Kang collapse that is close to hard alloy cutting tool, can realize efficient treatment; ② can gain the face of high grade treatment of high accuracy, can shorten substantially essence of life rubs time; ③ can be competent the high speed treatment of mould of tall hardness steel, can shorten substantially handling time; Service life exceeds ④ cutting tool of coating hard alloy 3 times above, establish milling cutter to be able to complete the precision work of the mould with a BNBP CBN; Precision of ⑤ R circular arc amounts to ± 5µm, can realize high accuracy treatment. 2 BNBP CBN establishs contrast of milling cutter function to pursue the 3 CBN that establish milling cutter and other company to use BNBP CBN respectively establish milling cutter, in same treatment condition blade mixes next cutting after undertaking milling to already machined contrast. Can discover, the central cutting that other company CBN establishs milling cutter already produced collapse blade near blade, treatment surface has tear off a trace; And collapse blade phenomenon is not had near the central blade that BNBP CBN establishs milling cutter, wear away very small also, treatment face is quite beautiful. The appearance that establishs blade of cutting of milling cutter center quite is knowable, the central blade ply that BNBP CBN establishs milling cutter is thinner. Because used the part before be being lost greatly, although also have enough strength around central blade, because this can reduce central blade thickness, can gain beautiful treatment face thereby, prevent blade of central blade collapse. BNBP CBN established milling cutter to use data of appearance of blade of cutting of the horn before be being lost greatly and BN350 of first-rate of function of the blade that fight collapse CBN, because this can come true,be close to hard alloy the mould milling treatment of efficient treatment condition. Workpiece material: SKD11(HRC60) ; Establish milling cutter: R1.

0, n=20000r/min, f=2000mm/min, ad=0.

05mm, rd=0.

05mm; Wind is cold; Cutting length: 100m pursues 3 cutting blade wears away and treatment surface pursues quite 4 to be in main shaft revolution 10 thousand turn and 20 thousand turn the photograph of blade of the cutting when the milling below the condition processes SKD11(HRC60) mould steel. With 10 thousand turn when milling is machined, CBN established the central blade part of milling cutter to produce collapse blade, cutting tool life establishs milling cutter under hard alloy; But with 20 thousand turn when milling is machined, hard alloy establishs milling cutter wear away bigger, and CBN establishs milling cutter to be not had almost wear away. It is very general that mould treatment achieves ± 5µm with the R precision that establishs milling cutter, but because wear away,coating hard alloy establishs milling cutter make knife clip position regressive, reduced R precision greatly; And CBN establishs milling cutter to be not had almost wear away, because this can realize the milling treatment of precision of R ± 5µm. Workpiece material: SKD11(HRC60) ; Establish milling cutter: R1.

0, f ＝ 0.

05mm/ tine, ad=0.

05mm, pf=0.

05mm; Wind is cold; Cutting length: 100m pursues the metabolic workpiece material of configuration of injury of blade of the cutting when 4 different revolution: SKD11(HRC60) ; Establish milling cutter: R1.

0, n=40000r/min, f=4000mm/min, ad=0.

05mm, pf=0.

05mm; Oily mist refrigeration pursues of wear extent of face of the knife after 5 high speed add man-hour pursue quite 6 establish milling cutter to machine mould example to pursue with BNBP CBN 5 to be in 40 thousand turn tatty of face of the knife after the cutting tool when steel of mould of SKD11 of milling of the high speed below the condition changes. Establish milling cutter with coating hard alloy hind knife face wear extent is compared, BNBP CBN establishs milling cutter hind knife face wear extent is dinky, can ignor almost. If wear away face of the knife after set of cutting tool life is width VB=0.

014mm, criterion the life that CBN establishs milling cutter is coating hard alloy establish milling cutter 10 times the left and right sides. When the hard steel of temper by dipping in water that processes HRC60 hardness grade, in 10 thousand turn when be being machined below the condition, CBN establishs the life of milling cutter and hard alloy to establish milling cutter to comparative; But in 20 thousand turn when be being machined below the condition, the life that CBN establishs milling cutter is the 3 ～ that hard alloy establishs milling cutter 5 times; Be in 40 thousand turning is 10 times what hard alloy establishs milling cutter below the condition. This shows, main shaft revolution is taller, the difference of the life that CBN establishs milling cutter and hard alloy to establish milling cutter is bigger. CBN establishs the price of milling cutter to establish 3 times of milling cutter for hard alloy about, if be in 20 thousand turn to be machined with aspirant travel milling, can realize cost and hard alloy to establish milling cutter to comparative at least. Because cutting tool life lengthens 3 times above, establish milling cutter to be able to machine a mould with 1, can shorten substantially grinding working procedure. If use BNBP CBN to establish milling cutter to process the mould data with not quite tall hardness, criterion the 30 times above that cutting tool life can achieve hard alloy to establish milling cutter. Example of 3 moulds treatment pursues 6 machine mobile telephone spare parts to use a pattern to establish milling cutter with BNBP CBN (cutting condition sees subordinate list) . When rough machining, ad=0.

1mm establishs milling cutter to original CBN for very slashing, and use BNBP CBN establishs milling cutter not to produce collapse blade not only, and can realize stable treatment. When finish machining, use R0.

The BNBP of 3mm CBN establishs milling cutter to issue treatment in the high speed condition of 36000r/min. Graph the 6 enlarge photographs that establish milling cutter and coating hard alloy to establish surface of milling cutter finish machining for BNBP CBN. Visible, mark of face feed knife is clear and the treatment that CBN establishs milling cutter is even, and the mark of treatment face knife that hard alloy establishs milling cutter is not very clear and even. Accordingly, use BNBP CBN establishs milling cutter treatment to be able to reduce follow-up grinding workload substantially. Revolution of R(mm) of use cutting tool of working procedure of watch cutting condition (Min) feed speed (Mm/min)Ad(mm)Pf(mm) is thick add BNBP2R100-05541.

02500015000.

10.

BNBP2R050-02540 of 2 semifinishing machining.

52500010000.

050.

BNBP2R030-01240 of 1 finish machining.

3360005000.

030.

02 workpiece material: SKD11(HRC60) ; Establish milling cutter: R0.

3, n ＝ 36000r/min, f=500mm/min, ad=0.

03mm, pf=0.

02mm; Oily mist is cooling; MEGA Ⅲ machining center graph 7 cutting blade wears away and treatment surface is compared CNC Milling