Stainless steel breaks the configuration cutting bits of bits getting and control

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Carbon is contained in stainless steel of commonly used martensite, austenite few, contain bore with a reamer of chromic, nickel much, material although hardness is not tall, dan Ren sex is big, cutting is out of shape, rate of sclerosis of cutting temperature, treatment is higher. To improve cooling result, raise broach durability, must control bits and platoon bit. Article knot co-worker is versed in in Shanghai manage accessary factory is opposite the university the experiment research achievement that nuclear power plant uses gripper shoe drill, analysed get all sorts of bits form when cutting stainless steel to generate a principle, discussed the delicate concern between optimal bits form and cutting parameter. Put forward to control optimal bits form thereby, obtain the means that breaks bits effectively. If the pattern cutting bits that 1 stainless steel breaks bits to get and the basic blade form that produce conditional stainless steel to break bits to get pursue 1 is shown. Its characteristic is: Grind a bigger sharp angle (2F) and very shallow circular arc blade (radius R) , outside was being generated straight blade (width L) and inside, outside blade height differs H. Generated through building area of the knife before grinding the place that get a heart inside straight blade, inside blade sharp angle (2F1) , leave very short horizontal sword. Cent narrates this kind to get below model the pattern cutting bits that cuts and generation condition. Graph the basic blade form that 1 stainless steel decides bits to get 1) helix is banding bits: If pursue,2 are shown. This kind cuts bits curly place occupies a space big, easy block, won't break bits, affect broach refrigeration result. Graph bits of form of 2 helix covering of the fan generates a principle: Twist drill edge nods cutting speed to differ each. Blade manages speed outside tall, the flow that cut bits is rapid, cut bits longer. Closer center rate is lower, the eduction that cut bits is slower, the length that cut bits is shorter. This kind outside blade roll into is bigger the arc shape of radius, roll into of close center part is lesser of radius cut bits, be like not disjunction, form body of helix covering of the fan. This is twist drill sharp the crucial point is the commonnest cut bits. 2) helix is banding the width of bits depends on outside edge width, general L=0.

25 ～ 0.

3d (d, broach diameter) . When L is lesser, edge orders cutting speed look each about the same, the part before edge is large, cutting is out of shape lesser, cut bits to eliminate fluent, but curly into a narrower helix banding bits. Banding bits can be twined go up in broach helix blade, break off not easily, the security when eduction is poorer. Bits of lump of covering of the fan: Appear inside on blade of sunken circular arc, if pursue,3 are shown. This kind cuts bits to be short lump, coil naturally, cut bits easier eduction and clear. Graph bits of lump of form of 3 covering of the fan generates a principle: Each nod the flow direction that cut bits to differ on circular arc blade, its rule is the center that chooses the flow direction that cut bits to all carry circular arc sword each (edge law to) . Cut bits to be in curly process of direction of blade of edge circular arc add be out of shape, make cut bits to spread out form of covering of the fan to be torn off form lump bits. 3) bits of long and thin helix: Give the blade outside now or inside on straight blade, if pursue,4 are shown. This kind cuts bits to break off not easily. Graph 4 slightness are narrow helix bits generates a principle: Blade of broach left and right sides is ground asymmetry, a paragraph of cut subtense short blade to was not excised more at the same time surplus that blade grows outside. The width that cut bits is incorrect metage. Straight blade is ground inside piece bigger before horn and roll when bits chamfer, appear possibly also bits of long and thin helix, but its helix lead is compared outside of straight blade small. 4) " 6 " glyph bits: Appear in circular arc chamfer very shallow outside blade and circular arc are compound on blade, if pursue,5 are shown. "6 " the automatic eduction with glyph can stable bits breaks off. "6 " glyph bits belt is beautiful " 6 " bits of glyph of 5 6 of glyph bits graph generates a principle: Bore in the begining outside blade and circular arc blade cut the lump bit that becomes an organic whole repeatedly, (" 6 " the head of glyph bits) after coiling to be spent to one fixed length, of direction of blade of edge circular arc add be out of shape, make cut bits dissension, begin to divide bits, blade and circular arc blade cut bits to part outside eduction. Outside blade is one paragraph banding bits, (" 6 " the tail) of glyph bits, circular arc blade cuts bits to be lump bits. "6 " after glyph bits arrives at certain length, cut bits to encounter the groovy wall above in getting groove, cut bits to bend quadrature adscititiously and be broken off, its length and helix chamfer 1/2 lead agrees basically. If cut bits to was not come up against,get groove, eduction grows certainly to the space after spending, also can swing as the whirl of broach. Its length is 60~100mm left and right sides about. 5) of strip steel muscle " 6 " glyph bits: Give the blade outside now and the case that circular arc blade controls asymmetry, if pursue,6 are shown. This kind of ply that cut bits is double, break off more easily. But aggravating point bear, the influence gets blade life. Graph 6 those who contain reinforcing steel bar " 6 " glyph bits generates a principle: Be in " 6 " below the condition that glyph bits creates, the blade outside be like is ground accident is differly, a paragraph of grows so that want to did not excise subtense short blade more necessarily at the same time surplus, the protruding muscle of the blade outside generating and boundary of circular arc blade. Horizontal blade is ground incorrectly center, make bore expands, cutting surface external diameter manages occurrence chance to extricateoneself from an awkward position. The biggest outside classics at the same time edge, inevitable subtense not the step of cut away is excised along with all the others, the protruding muscle that the blade outside generating is in. 6) the helix that take a flower is banding bits: Appear in circular arc blade to be ground slightly difficult situation, if pursue,7 are shown. Cut bits hard thick, break off harder, the security when eduction is poorer. Graph 7 belts " flower " helix is banding bits generates a principle: In generate " 6 " below the condition of glyph bits, be like circular arc chamfer slightly deep, the state discharging bits of time is joined when although appear,blade and node of circular arc blade are in outside, but give priority to in order to divide bits. The time that blade and circular arc blade cut bits to connect an organic whole outside is very short, appear a paragraph paragraph " flower " the bits joining system of shape. Generate a principle: In generate " 6 " below the condition of glyph bits, be like circular arc chamfer slightly deep, the state discharging bits of time is joined when although appear,blade and node of circular arc blade are in outside, but give priority to in order to divide bits. The time that blade and circular arc blade cut bits to connect an organic whole outside is very short, appear a paragraph paragraph " flower " the bits joining system of shape. 7) in bits of account of long helix division: Give the blade outside now and former arc on compound blade, if pursue,8 are shown. Cut bits hard thick, break off harder, the security when eduction is poorer. Graph 8 in bits of account of long helix division generates a principle: The blade outside the condition with larger amount of better in material plasticity, feed and place of node of circular arc blade basically are to appear the shape that join system cuts bits. But what way of thicker blade of circular arc of the edge that cut bits develops form of covering of the fan is add be out of shape in the process, cut bits to be become by rip division account bits, and with outside bits of first flank shape connects an organic whole. The element that 2 influences cut bits pattern and control 1) the influence of broach blade parameter to bits form, if pursue,1 is shown. A.

R of radius of circular arc blade: R is too small: ξ of pointed part of point of body part bits is small, cut bits easy departure when ξ <150 ° , blade goes out outside banding bits, circular arc blade gives bit of lump of covering of the fan. R is too big: ξ of pointed part of point of body part bits is big, when ξ > when 170 ° outside an organic whole of Yi Liancheng of bits of blade, circular arc blade, give bit of short form of helix covering of the fan. R moderate: Form ξ =155 ～ when 165 ° , blade sheds bits direction and photograph to face bits of circular arc blade to flow to included angle outside lesser, time is joined when, generate just about right now " 6 " the condition of glyph bits. Optimal ξ horn, concern with the element such as the material tenacity, ply that cut bits, not be invariable. Can cut explore ask through trying. B.

Inside, outside when blade of circular arc of blade height poor H is deeper, blade and circular arc blade form nature to separate bits aspect outside, blade goes out outside banding bits, circular arc blade gives lump bit. When circular arc blade is more shallow, blade and form of circular arc blade won't do to divide bits naturally to nod outside, cut bits to make bit of short form of helix covering of the fan into an organic whole repeatedly. Deepness of circular arc blade uses blade of inside and outside perpendicular height poor H will control, h value and feed are measured (cutting ply) when becoming certain proportion, value of H of general appropriate control is about 0.

8f.

Suit relatively. C.

Outside blade sharp angle: 2 φ cross blade sharp angle outside hour (2F<125 ° ) grind ～ of =150 giving ξ hard 165 ° pointed horn. Cut bits to coil easily inside the chamfer that hold bit, unfavorable eliminate. Practice experience makes clear, 140 ° of ～ of ° of 2 φ =135, cut bits to pour out of direction to approach as parallel as broach axes, advantageous platoon bits. And form larger ξ part easily, control appears " 6 " word bits. Bits of perpendicular height poor H, cent nods blade of ° of R of circular arc radius, inside and outside pointed horn ξ , outside blade sharp angle 2 φ 4 parameter are related. Normally R You Ren grinds radius of emery wheel round horn to decide, the H after 2 φ , ξ can pass make choice of adjust broach blade to grind the craft parameter of machine to control. 2) material tenacity is big to the influence material tenacity of bits form, ξ horn must be ground smallier ability makes bits apart. Cut bits to connect otherwise piece do not divide. Material tenacity is low, ξ horn appropriate is ground some more greatly. 3) cutting tool wears away to get blade to divide part of bits pointed part to grind to the influence of bits form smooth or after collapse blade, cause actual ξ to increase. Pass when actual X big (> 165 ° ) , can cause bits form to transform to what connect from cent. Accordingly, stainless steel breaks what bits gets to grind blunt standard or durability to should be a basis with the change of bits form. Bits form is short lump from 6 words deformation, should change a knife already. Because pointed part part is ground,we ever had happened smooth, wide short lump bits blocks the accident of broach of dead twist off. 4) broach horizontal blade is right in the error effect to bits form is perverse blade is incorrect in the amplification that is mirrorred in bore diameter, make deputy blade unilateral works, the horn after causing broach arris edge to lose wears away, this kind is not normal attaint to make broach life greatly cut. Horizontal blade is incorrect in make graph of two blade cutting changes, some edge is cut times doubler cut bits thickly, and across is cut thinner cut bits. Times doubler cut bits thickly to just be on the reinforcing steel bar that cut bits, cut bits thick and hard, bits of instead strip shape, form 6 glyphs bits hard. 5) cutting dosage increases feed to the influence of bits form, cut bits thickening, lay agglomerate shape bit easily, contrary, easy generate banding bits. Change broach cutting rate, be out of shape to cutting affect somewhat. Speed of cutting of broach of general high-speed steel has bigger change impossibly. But some stainless steel are very sensitive to bits form, reduce broach revolution to be helpful for making lump bit. 3 verdict analysis gets the result that cuts an experiment knowable, in the of all kinds configuration that cut bits, "6 " glyph bits is optimal. Short helix is banding bits is acceptability also. The cuts bits to be like muscle of strip shape bits, strip steel cuts flower of bits, belt helix of other type is banding bits should prevent. 1) control is generated " 6 " glyph bits, the requirement that reasonable use broach should satisfy is: Control parameter of broach blade form: Sharp angle 2F=135 140 ° of ～ , blade grows L=0 outside.

25d, 165 ° of ～ of ° of X=155 of pointed part of the point that divide bits, outside blade and circular arc blade are perpendicular height differs H=0.

8f 2) control broach blade grinds symmetrical precision: Horizontal blade is right in degree, outside blade, inside blade, circular arc blade is jumpy it is good to measure Yue Xiaoyue. Blade of general use broach is ground machine, but online measure blade of inside and outside jumpy quantity. Horizontal blade is incorrect in error <0.

02 ～ 0.

03mm is feasible. Manual blade grinds or so two blade hard symmetrical, inevitable meeting produces those who take reinforcing steel bar to cut bits, accelerate broach wear away. 3) the choice gets reasonably cut dosage: Auger cut stainless steel appropriate to use inferior cutting rate, the feed of moderate is measured. Broach of common high-speed steel recommends ≈ of V=15 ～ 18m/min F 0.

015d Mm/r, use enough emulsion to cool. Tenability of such cutting tool durability are controlled 100 minutes. CNC Milling