The cutting of high strenth steel and steel of extra high strength is machined (below)

1do(do is broach diameter) . ° of Gf=0 of the horn before the feed of broach, 12 ° of ～ of ° of Af=6 of the horn after feed. The bit that dislocation shallow aperture gets should choose coating razor blade or can be not coating razor blade. Recommend chosen coating razor blade to have: YB01, YB02, YB03; Blame coating razor blade has: YC10, YC30, YC40, YD20, 798, 813 wait. 10 auger when cutting high strenth steel and steel of extra high strength how to choose cutting dosage? Auger cut high strenth steel and steel of extra high strength, lower than getting the cutting rate that cuts general steel products 50 ％ left and right sides. When choosing bore of high-speed steel broach, take Vc=10 ～ 15m/min commonly, when the hardness HRC>45 of workpiece material, cutting rate is lower. Feed is F=0.

03 ～ 0.

3 Mm/r, broach diameter hour takes small cost. When using hard alloy bit, can pick higher cutting rate, but cannot too tall, the hardness to broach durability impact that must consider workpiece data. When HRC>50 of workpiece material hardness, the speed of broach should be less than 30m/min, feed F=0.

03 ～ 0.

3 Mm/r. High-speed steel and hard alloy broach, the cutting rate that gets the high strength that cuts different hardness and steel of extra high strength sees a table 8; High-speed steel group the cutting dosage that get sees a table 9. Watch 8 choose hardness of cutting speed workpiece by workpiece material hardness 4040 ～ of 35 ～ 5050 ～ of 4545 ～ speed of cutting of 55 cutting tool (M/min) high-speed steel 9 ～ 127.

6 ～ 114.

6 ～ 7.

62 ～ 6.

6 hard alloy 12030 ～ of 72 ～ 30 ＜ of 7222 ～ 30 watches 9 high-speed steel group get cutting dosage dosage of cutting of L/D of ratio of pit-depth to pit-diameter bore diameter (60 ＜ of Mm)81012162025303540 ～ 3f (mm/r)0.

130.

180.

220.

260.

320.

360.

400.

450.

5Vc (m/min)1212.

5133 ～ 8f (mm/r)0.

120.

150.

180.

220.

260.

300.

320.

380.

41Vc (m/min)1111.

512 graphs the 5 tap that attack whorl of firm intensity steel 11 how to attack high strenth steel and whorl of steel of extra high strength? Attack the tap of high strenth steel and whorl of steel of extra high strength, high-speed steel of usable high-powered high-speed steel, pulverous metallurgy make. Achieve HRC48 ～ when workpiece hardness 52 when, should use hard alloy tap. Tap is used more jump tooth tap and correction tap. The tooth form horn of tap should be less than 2 ° ～ 5 ° , calibration part is due of 33 ′ of 17 ′ ～ pour awl, cutting cone angle takes 2 ° 5 ° of 30 ′ ～ , length of part of calibration of 2/3) of ～ of L1=(1/2 of cutting awl length. Answer to increase diameter of whorl bottom outlet and cutting part length appropriately, reduce calibration part length. If attack the tap that makes thread of high strenth steel (like the graph 5 show) , the material of tap exceeds hard high-speed steel to contain cobalt character (W2Mo9Cr4VCo8) , norms is M18 × 1.

5, every groups 3. When tap, use soya-bean oil or colza oil make cutting juice. 12 milling high strenth when steel and steel of extra high strength how to choose cutting tool and geometrical parameter? The room temperature intensity of high strenth steel and steel of extra high strength is very high, tensile strength is in commonly 1470 MPa above. The hardness after quenching is in HRC35 above, highest can amount to HRC58. The martensite of high strenth, the cutting when cutting stress is great, cutting temperature is high, cutting tool wears away serious, easy collapse blade or hit a knife. The Ying Xuanjiang when milling is spent tall, impulse withstand as good as hear resistance cutting tool stuff, be like high-powered high-speed steel and hard alloy, also can choose Al2O2, cutting tool of pottery and porcelain of TiC series hot pressing. High-speed steel milling cutter, can choose Gao Fan high-speed steel, contain cobalt or contain aluminium to exceed hard high-speed steel, be like W12Cr4V4Mo, W2Mo9Cr4VCo8, W6Mo5Cr4V2Al. When choosing hard alloy to make cutting tool material, should pick bending strength the razor blade with tall, taller also hardness, be like SC30, YC40, SD15, YC35, YS25, 726, 813 etc. When choosing parameter of cutting tool geometry, want mature the cutting characteristic of this kind of steel, should reduce tool cutting edge angle, increase radius of circular arc of point of a knife, cut deep before the horn before horn and feed should be less than 0 ° () of except of high-speed steel milling cutter. The point of hard alloy and cutting tool of pottery and porcelain should pour arris, in order to increase the strength of point. 13 milling high strenth when steel and steel of extra high strength how to choose cutting dosage? The breed of high strenth steel and steel of extra high strength is very much, its intensity and hardness also have very big difference. Object and treatment condition should be machined according to differring when milling, dosage of logical choice cutting. When choosing cutting career, in the intensity of workpiece material and hardness higher case falls, answer to lower cutting rate appropriately, reduce a knife to provide every tine feed. The intensity that presses workpiece material chooses milling career, see a table 11. The hardness that presses workpiece material chooses milling dosage, see a table 12. Watch 11 choose 12001200 ～ of ～ of Sb (MPa)800 of intensity of milling rate workpiece by workpiece data strength 18001800 ～ of 15001500 ～ 2100 milling rate (M/min) high-speed steel takes F=0.

307 ～ of 1mm/z10 ～ 4 hard alloy take 82 ～ of 123 ～ F=0.

08 ～ 0.

12025 ～ of 4mm/z60 ～ 42 ≤ of 808 ～ 8 watches 12 choose milling dosage by workpiece material hardness cutting tool milling cutter of high-speed steel face of 400HBVc (m/min)f (mm/z)Vc (m/min)f (mm/z) of 250 ～ 350HB350 ～ 10 ～ 180.

13 ～ 0.

256 ～ 100.

08 ～ 0.

2 columnar milling cutter 10 ～ mill of essence of milling cutter of face of hard alloy of milling cutter of 3 15 blade 80 ～ 1270.

12 ～ 0.

3860 ～ 900.

12 ～ 0.

Thick mill of 30 milling cutter 10053 ～ of 70 ～ 76 columnar milling cutter 60 ～ 1000.

18 ～ 0.

3046 ～ 760.

18 ～ 0.

Milling cutter of 3 30 blade 0.

13 ～ 0.

300.

13 ～ 0.

Milling cutter of face of 30 pottery and porcelain 100 ～ 3000.

15 ～ 0.

3080 ～ 1000.

08 ～ 0.

30 columnar milling cutter 0.

13 ～ 0.

Milling cutter of 3 30 blade 0.

10 ～ 0.

300.

10 ～ 0.

Do steel and steel of extra high strength have 3014 cutting high strength what example? Turning: Workpiece material is 32CrNi3MoVA character, sb=1080 MPa, hardness is HRC35 ～ 38. Cutting tool material is YN05, 8 ° of G0=4 ° ～ , 10 ° of A0=6 ° ～ , ls=-4 ° . Turning dosage is Vc=65m/min, f=0.

3mm/r, ap=1mm. Turning: Workpiece material is 35CrMoSiA character, sb ≥ 1450 MPa, hardness is HRC43 ～ 48. Cutting tool material is AG2 pottery and porcelain, g0=-4 ° , a0=6 ° , ls=-4 ° . Cutting dosage is Vc=150 M/min, f=0.

3mm/r, ap=0.

3mm. Milling (face mill) : Workpiece material is 40CrNiMoVA character, sb=1870MPa, hardness is HRC52 ～ 54. Cutting tool material is YM052 hard alloy, 5 ° of G0=0 ° ～ , a0=8 ° , ls=-5 ° , kr=45 ° . Cutting dosage is Vc=23 M/min, f=0.

08 ～ 0.

1 Mm/z, ap=2mm. Bore: Workpiece material is steel of extra high strength, sb=1850 ～ 1980 MPa, hardness is HRC53 ～ 55. The material of broach contains cobalt to exceed hard high-speed steel for W12Mo3Cr4V3Co5Si. Cutting condition is N=105r/min, f=0.

05 Mm/r, broach diameter Ø10 Mm, hole depth 30 Mm, general refrigeration, every blade worries bit, but bore 38 ～ 40. Aperture of bore with a reamer: Workpiece material is high strenth steel character, sb=1200 MPa, use contain cobalt to exceed hard high-speed steel, in N=140r/min, f=0.

05mm/r, surplus of aperture of bore with a reamer is 0.

Below the circumstance of 1mm, with the reamer of diametical 8mm, aperture of bore with a reamer 60 ～ 70, dimension is stable, ra is exterior surface roughness 1.

6 μ M is the following. Tap: Workpiece material is high strenth steel, sb=1200 MPa, use the M12 × that contains cobalt to exceed hard high-speed steel the tap of 1, the hand moves tap, attack 60 aperture, tap did not see wear away. With the tap of common high-speed steel, can attack 6 ～ only 8 screw. CNC Milling