Die of temper by dipping in water provides the efficient and accurate treatment establishing mill of steel

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Mould steel is in heat treatment ongoing travel cutting is machined for the most part, basically reach for planar milling model antrum, punch, groove the treatment establishing mill that wait, the reentry after cutting is machined quenchs all right, the heat treatment such as temper, right now hardness can achieve HRC50 ～ 60 taller even. Tall hardness can assure the wearability of the mould, prolong its service life, but the spare parts after heat treatment is changeful form, material hardens, processability can become poor, to achieve final precision requirement, can use grinding only manual even and abrade wait for a method to have precision work. Efficiency of means of this kind of treatment is low, periodic long, delivery late, cost is high, satisfy client requirement hard. Current, already formed a kind of such situations in fact, which company can be efficient machine a mould, shorten date of delivery, reduce corresponding cost, can enlarge the market, enlarge a sale, in the get victory in competition. To satisfy above to ask, people changed train of thought, whether be material heat treatment also can undertake with cutting tool cutting is machined after temper by dipping in water is hard, especially each type antrum, model the face whether can also use establish milling cutter to machine, make its not only use at semifinishing machining, use at finish machining even, achieve a share or complete " with mill era is ground " . Cutting tool cutting is measured to the excision bulk of the spare parts in unit time be more than emery wheel grinding far, namely its machine grinding of efficiency far outclass, and in installation cost, cover an area of area, environmental protection, reduce the many sided such as totle drilling cost to be able to bring a lot of economy and social benefit. Introductory whole establishs milling cutter to be the ask and does improvement that gets used to hard steel of cutting temper by dipping in water below. The development of cutting tool material and innovation: CBN material begins to be used at establishing milling cutter in recent years, speak of to be ground with car generation, with mill era grinds hard steel of treatment temper by dipping in water, think of to apply cubic nitrogen to change boron above all normally (CBN) cutting tool material, the atomic hardness of CBN amounts to HV8000 ～ 9000, the hardness of PCBN of its agglomeration body can amount to HV3000 ～ 5000, hear resistance amounts to 1400 ～ 1500 ℃ . PCBN returns the normal temperature hardness of prep above pottery and porcelain and hard alloy in the hardness when 800 ℃ , reason is OK hard alloy the cutting speed of 5 times undertakes 3 ～ cutting, and its chemistry stability is good, in 1200 ～ 1300 ℃ high temperature falls, also won't fasten material happening chemistry to react with iron, with carbon also be when 2000 ℃ ability can produce reaction. CBN is right when the felt of all sorts of material, high temperature diffuse effect is less than hard alloy also much, because this suits particularly,process steely data. The thermal conductivity of CBN is 20 times of hard alloy, be next to golden steel stone, and its thermal conductivity rise and increase as temperature. The coefficient of friction of CBN and different material is only 0.

1 ～ 0.

3, and as cutting speed rise, coefficient of friction can drop, and the coefficient of friction of hard alloy is 0.

4 ～ 0.

6. Company of data of 3 water chestnut developed CBN material earlier establish milling cutter, head of ball of its CBN-2XLB R1x5 stands milling cutter (namely ball head radius is 1mm, the neck is long for 5mm) can the feed of the rotate speed of 20000r/min, 1700mm/min, 0.

Of 05mm cut deep (back penetration of a cutting tool is measured) the SKD11 mould steel of milling 60HRC. Cutting 800 meters later, knife face wears away only after 0.

03mm. If will be cut deep rise 0.

1mm (fall in taller cutting bear namely) , in cutting 400 meters later, knife face wears away to be only highly after 0.

022mm. Because precision of its ball head is tall (R public errand is ± 5 μ M, external diameter public errand 10 μ of 0 ～ M) , treatment precision is very tall, to maintain same high accuracy, head of high accuracy ball of a CBN stands the surface that milling cutter can machine, if change the head of hard alloy ball that uses same precision to establish milling cutter, need 7 ～ 8. When die of cutting temper by dipping in water provides steel, if choose CBN material, although the price is more expensive, but because cutting rate is high, can shorten handling time, prolong cutting tool life, improve product quality, because this may have better economy. Of course, if lose contact with reality,machine a condition, choose material of new-style cutting tool blindly, also may increase finished cost (the 6 ～ that the price of CBN cutting tool is hard alloy cutting tool about 10 times) . Additional, when using data of new-style cutting tool, if cutting condition choice is undeserved, also can affect treatment quality and cutting tool life. Accordingly, answer whole treatment task to undertake assessment, integrated balance production lot, handling time, machine tool and cutting tool function, below the premise that assures to machine quality, in cutting speed lower requirement falls, also can choose the cutting tool of coating hard alloy with inferior value, can achieve better treatment result likewise. The new development of coating technology and hard alloy material asks according to different use, the hardness of hard steel of temper by dipping in water can amount to HRC45 ～ normally 68. Process work for successful cutting, the hardness of cutting cutting tool needs to achieve normally by the 3 ～ of cutting workpiece hardness 5 times above is advisable. Coating hardness is commonly used diamond pyramid hardness (Hv) determine, it is with the product of company of 3 water chestnut exemple, its TiN coating establishs milling cutter hardness to be Hv1900, use (Al, ti) the hardness of Mstar Ji Lixi knife of N coating is Hv2800, use (Al, ti, the VC of Si)N coating hardness that establishs milling cutter is Hv3200, the form of rice of Impact Miracle accept that develops recently (Al, ti) N coating VF establish milling cutter, its hardness rises further, achieve Hv3700, can say the hardness that was close to PCBN is worth. Its oxidation begins temperature and coating adhesion to also rise further, coefficient of friction drops ceaselessly. Be worth with HRC pure if be being compared with Hv value, HRC68 comparatives about Hv940, although each hardness is worth rise to be not linear relation with contrast, but can see, (Al, ti) it is OK already that N coating Mstar establishs milling cutter hard steel of cutting temper by dipping in water, and hardness and oxidation begin the series of VF of Impact Miracle coating with higher temperature to establish milling cutter to be able to achieve much better treatment result. Series of VF of Impact Miracle coating establishs the cutting example of milling cutter: (1) establish milling cutter to machine high-speed steel SKH51 with head of VF-2SB R1 ball (M2) mould (hardness HRC65) , cutting dosage is: Rotate speed 20000 turn / Min, feed speed 6000mm/min, 0.

15mm/ tine, back penetration of a cutting tool is measured 0.

07mm, side penetration of a cutting tool is measured 0.

2mm, wind is cold. After cutting length amounts to 30m, cutting tool still was not injured. (2) with VF-MD φ head of 6 right angle stands milling cutter to machine mould steel SKDII (HRC60) , cutting dosage is: Rotate speed 8000 turn / Min, feed speed 2160mm/min (0.

045mm/ ages) , wind is cold. After cutting length amounts to 100m, cutting tool still was not injured. (3) establish milling cutter to machine hot-working to use Die Casting model with head of VF-2SB R3 ball (material is DH315, hardness HRC52) , cutting dosage is: Rotate speed 16000 turn / Min, feed speed 1600mm/min, every tine feed 0.

05mm/ tine, back penetration of a cutting tool is measured (cut deep) 2mm, side penetration of a cutting tool is measured 0.

2mm, arrange mill, wind is cold. Although this material tenacity is very big, but in cutting 120 many rice hind, cutting tool just appears injury. (4) the pattern of pulverous metallurgy high-speed steel that establishs above of HRC68 of milling cutter cutting with head of VF-2SB R1 ball, cutting dosage is: Rotate speed 8000 turn / Min, feed speed 1260mm/min, every tine feed 0.

08mm/ tine, back penetration of a cutting tool is measured 0.

2mm, when side penetration of a cutting tool 0.

07mm, wind is cold, arrange mill. Cutting length can amount to 50 meters of above, more multiple than establishing milling cutter life to rise commonly. (5) establish milling cutter to machine mould steel SKDII with head of VF-2SB R10 ball (HRC60) , cutting dosage is: Rotate speed 1200 turn / Min, feed speed 240mm/min, every tine feed 0.

1mm/ tine, quantity of back penetration of a cutting tool can be as high as 8mm, side penetration of a cutting tool is measured 0.

5mm, arrange mill, wind is cold. Cutting deep condition greatly so, still but cutting 30 meters, for 3 times of old product. (6) with × of long neck VF-2XLB R1 20 balls head stands milling cutter to machine a mould deep model groove, material is SKDII (HRC60) , cutting dosage is: Rotate speed 10000 turn / Min, feed speed 1000mm/min, every tine feed 0.

05mm/ tine, wind is cold, arrange mill. Length of cutting of move back and forth can amount to 20 meters, more similar than other product life raises one times. Nextpage (7) the flank of hard steel of temper by dipping in water that establishs milling cutter to machine hardness to amount to HRC60 at the same time with VF-MD orthogonal head and underside, cutting is stable, can acquire good exterior quality, the configuration that cut bits, colour and lustre is normal, cutting speed is 151m/min, every tine feed 0.

1mm/ tine, of the blade end its be able to bear or endure the sex that be short of caustic, outside Zhou Ren's wearability all good. (8) establish milling cutter VF-MDRB with circular arc head with feed of cutting speed 50m/min, every tine 0.

05mm/ tine, cut deep 0.

5mm, cut wide 8mm to machine SKDII (60HRC) , arrange mill, wind is cold. Cutting length 8 rice hind, cutting tool does not have injury almost. Express the characteristic Impact MIRACLE (Al of IMPACT MIRACLE coating, ti, si) N (Al, ti) oxidation of 100N 80N 80N of adhesion of N hardness 3700HV 3200HV 2800HV begins temperature 1100 ℃ of 1300 ℃ 840 ℃ coefficient of friction 0.

48 0.

53 0.

58 establish grain of hard alloy of milling cutter matrix to exceed imperceptible Hua Lixi when knife tooth is being machined, bear repeatedly concussion load, because this must have enough tenacity. When cutting oil hard data, cutting muscularity, should raise tenacity more. Nowadays, the hardness of coating is taller and taller, coating assured the wearability of the cutting tool when hard steel of cutting temper by dipping in water, and but more of cutting sex, tenacity is support base material will assure. The base material that coating hard alloy establishs milling cutter basically is tenacity tall, fight brace up the K with good sex kind hard alloy (bases is WC) . To raise tenacity, want to make WC crystallization grain is refined, coating appearance is better, should make its matrix grain is refined more, the performance that processes hard steel of temper by dipping in water is higher also. The brilliant granuality of base material of Impact Miracle coating can amount to 1 μ M the following, make its wearability and tenacity rise at the same time. Caption: The structure that VF establishs milling cutter is improved (R0 of milling cutter of head of ball of VF-2SB IMPACT MIRACLE.

1-R10mm in all head of ball of long neck of VF-2XLB IMPACT MIRACLE of standards of 34 kinds of measurement stands milling cutter R0.

1-R3mm, in all orthogonal head of VF-SD IMPACT MIRACLE of 119 kinds of measurement standards stands 12mm of φ of 1- of milling cutter φ in all head of right angle of VF-MD IMPACT MIRACLE of standards of 12 kinds of measurement stands 25mm of φ of 1- of milling cutter φ in all VF-SDRB of standards of 18 kinds of measurement (New) head of IMPACT MIRACLE arc stands 3- of milling cutter φ φ 12mm in all VF-MDRB of standards of 13 kinds of measurement (, the improvement that establishs milling cutter structure (1) the improvement that ball head establishs milling cutter structure: Make 2 advocate edge is formed in center carrying blade on the head a bit, lest make horizontal blade, in order to reduce cutting force, improve performance of central ministry cutting, eliminate gnaw crowded phenomenon, be helpful for forming and eliminate to cut bits, ball blade and outside round glide answers to cross between Zhou Ren, do not produce lapping defect. (2) the improvement that orthogonal head stands milling cutter and circular arc head to establish milling cutter to go up in bottom blade: Make bottom blade position stagger, facilitate make, improve condition of cutting of ministry of bottom blade center; Improve groovy form to discharge bits with benefit; Blade ministry pours a circle to be able to raise point to be able to bear or endure damaged sex, in order to get used to material of cutting tall hardness. (go up graph) (3) to improve life, enhance tigidity, special designed VF-2SSB short blade to establish milling cutter, full-length also shorter, it is to suit those who cover type clamp knife handle to establish milling cutter. (on graph) (4) to come true " with mill era is ground " , achieve the high accuracy of grinding, must raise the precision that establishs milling cutter oneself. The head of high accuracy ball of 3 water chestnut stands milling cutter, precision of R of ball head radius amounts to ± 0.

002mm, diametical precision 0 ～ 0.

01mm. Circular arc head stands precision of R of circular arc of part of milling cutter corner to amount to 0 ～ ± 0.

01mm. If be opposite inside limits of diametical public errand whole batch establish milling cutter product to differentiate by section of dimension public errand a certain number of groups, criterion in group dimension common difference is inevitable and narrow, can make each groups establish milling cutter to machine precision to rise, with such high accuracy establish milling cutter, flank of finish machining mould can achieve ± 0.

The high accuracy of 005mm, come true to machine a mould with high accuracy of effect of knife up establishing mill thereby, absolved grinding completely to machine. CNC Milling CNC Machining