Milling of alloy high speed studies cobaltic Jigaowen

69-2525.

3-12-3A, bit model is XOEX 120408R-M07, f40M, coating material is PVD TiAlN+TiN, horn is 20 ° before, horn is 14 ° after. Survey power plant: Use Kistler9265B trends to measure power instrument, to it the amplifier of form a complete set is Kistler5019 charge amplifier. Kistler9265B measures power instrument to use piezocrystal sensor, can measure the milling power of 3 direction at the same time, its are main function index sees a table 3. The directional definition of milling force is: Feed direction is X, milling cutter radial cuts deep direction to be Y, cutting tool axial is Z. Cutting tool wears away survey a system: Stereomicroscope, microscopical photograph measure analytic software like system and image. Test result and analysis are cut according to experience axial deep the main factor that is not influence milling force and cutting tool durability, so fixed axial cuts deep Ap to be 6mm, introduce 3 elements law of 3 levels orthogonality undertakes to GH188 of alloy of cobalt radical high temperature milling experiments. Express the 4 element level lists that use for experiment place, the experiment uses dry cutting, suitable mill. The generation foundation of force of milling of analysis of 1 milling force is to cut bits to be out of shape, at the same time milling force affects the generation of heat in metal cutting directly, affect cutting tool further wear away, durability of damaged, cutting tool, roll bits and break bits and treatment surface quality to wait [4] . In milling process, because cutting tool helix angle is 0 ° , the axial power that produces from this is less, and the Fz in machining a process is out of shape to the spare parts etc the impact is less, so here considers the milling parameter impact to Fx and Fy only. The graph shows the picture of milling force signal that measures for place of the Kistler 9265B appearance that measure power 1 times. The average that the experiment takes peak value of force of the milling in each milling cycle regards the milling of direction of X, Y, Z as component of force. Nextpage is expressed 5 with the watch the 6 experiment arrangement that are Fx and Fy respectively and result are analysed, among them milling length is 200mm. The F1 in the watch, F2 and F3 are every kinds of element to be in respectively 1, 2, the milling force the sum of the correspondence below 3 levels, m1, M2 and M3 are its average, r plays the extreme difference of milling force average for each level, fall in every kinds of element namely: R=Max{m1, m2, m3}-Min {m1, m2, m3} , (1) the principle that designs according to orthogonal experiment [5] , type (1) in the volume that the size of R reflects each element to be affected to milling force namely. The basis is expressed 5 with the watch 6 in the R of each element is worth size, can see every age feed Fz is opposite the impact of milling force is the biggest, radial cuts wide Ae, next milling rate Vc is the smallest to the influence of milling force, better conditional combination is milling rate Vc=100m/min, radial cuts wide Ae=0.

4mm, fz=0 of every tine feed.

04mm/z. According to traditional cutting theory, the concern of milling force and cutting dosage can express to be: F = CVcxaey Fzz, (2) according to type (2) , will express with Matlab 5 with the watch 6 in milling force result undertakes multivariate and linear regression, the experience that can gain milling strength is formulary: Fx = 108.

22vc0.

09ae0.

20fz0.

56, f = 40.

87, (3) Fy = 107.

17vc0.

08ae0.

27fz0.

30, f = 29.

23, (4) type (3) with type (4) in value of a quantity of statistic of F of formula of milling strength experience is respectively 40.

87, 29.

23>F0.

01 (3, 5) = 12.

06, the experience formula height that the specification drafts to close is remarkable, can forecast computation and analysis with what cut force at mill. By type (3) can see, in the process that machines GH188 of alloy of cobalt radical high temperature in milling, every tine feed Fz is the biggest to the influence of Fx (the index is 0.

56) , the influence take second place that radial cuts wide Ae (the index is 0.

20) , the impact of milling rate Vc is the least, and effect effect and above two milling parameter is contrary (the index is - 0.

09) . By type (4) can see, every age feed Fz and radial cut wide Ae about the same to the influence degree of Fy (the index is respectively 0.

30, 0.

27) , milling rate Vc is the smallest to the influence of Fy (the index is 0.

08) . 2 cutting tool wear away to analyse metallic cutting process with durability in, cutting tool falls in the action of cutting force and cutting temperature, as a result of attrition, felt, diffuse, collapse blade and plasticity are out of shape wait for action and cause wear away and damaged. Wear away when cutting tool when developing certain level, meeting influence machines quality, till lose cutting ability. Cutting tool wears away is one of main factors that restrict difficult treatment material to realize efficient cutting. Nextpage2.

1 cutting tool wears away the macroscopical analysis of configuration is like next rules when milling GH188: Cut in relatively inferior radial wide fall with the dosage of every tine feed, the biggest cut the groove near dark place to wear away more serious, its wear away to bandwidth is spent and develop speed to all exceed other position. Be like milling dosage Vc=80m/min, ae=0.

4mm, fz=0.

The wear extent of place of the groove when 04mm/z is 0.

41mm, and of the others place average hind knife face wears away to be only 0.

10mm; After milling dosage increases, cutting tool wears away to basically happen in 1/2 axial to cut deep around, the collapse blade of occurrence chunk of face of the knife after configuration is, broken. Because using inferior radial to cut,this may be wide age with every when feed milling GH188, cutting tool basically produces felt to wear away with abrasive, the high frequency concussion that cuts bits wool margin right now makes groove wears away develop what speed is more than other position to wear away, groove wears away ceaseless enlarge ambassador gets cutting tool be no longer in force, and cutting tool is other of place wear away lesser still; Should cut with bigger radial wide undertake with every tine feed intermittent when milling, cutting blade bears bigger concussion load, the 1/2 axial that often is located in cutting blade because of the position with the top temperature in milling process at the same time is cut deep around, the thermal stress of here can make cutting tool surface produces crackle, so the integrated action in concussion load and thermal stress falls, axial of the 1/2 on cutting blade is cut deep the around collapse blade that produces chunk, broken and make cutting tool invalidation. Additional, in the process of milling GH188, except after knife face generation wears away outside the belt, the cutting tool material near cutting blade is met wait for a reason because of attrition and felt and get loss, make cutting blade arises on whole " regressive " phenomenon, and irretentive keener before appearance, make temperature of milling force and milling lifts further thereby, make wear process aggravate. 2.

Parameter of 2 each milling chooses cutting in the influence experiment process to cutting tool durability relatively even area wears away in blade, face of the knife after its average is being taken to serve as cutting tool after taking width to be measured 3 times to wearing away wears away VB. Graph the 2 cutting tool wear curve that experiment for orthogonality, each curve serial number parts corresponding watch 7 in the experiment of corresponding serial number. Blunt standard VB =0 is ground in wear curve.

3mm place is done linear (place of the dotted line in be like a graph is shown) , criterion the cutting tool durability that its and the abscissa that wear curve node is in are dosage of this group of milling to fall namely, express the 7 test results that are cutting tool durability and analysis. The basis is expressed 7 in the size that R is worth, can see milling rate Vc and every age feed Fz is the main factor that affects T of cutting tool durability, both similar to the influence degree of T of cutting tool durability, and radial cuts wide Ae the smallest to the influence of T of cutting tool durability. Relatively the milling condition combination of beautiful is milling rate Vc=80m/min, radial cuts wide Ae=0.

4mm, fz=0 of every tine feed.

04mm /z. As formulary as milling strength experience principle is same, undertake multivariate and linear regression to expressing 7 medium data, attainable experience of following cutting tool durability are formulary: T = 1011.

33vc2.

41ae0.

53 Fz1.

01, f = 5.

76, (5) type (5) in the F statistic value of a quantity of formula of experience of cutting tool durability is 5.

F0 of 76 ＞ .

05 (3, 5) =5.

41, the experience formula significance that the specification drafts to close is very good, can use what Yu Dao provides durability to forecast computation and analysis. By type (5) can see, milling rate Vc is the biggest to the influence of T of cutting tool durability (the index is 2.

41) , every tine feed the influence take second place of Fz (the index is 1.

01) , the impact that radial cuts wide Ae is the least (the index is 0.

53) . The last word carries the research of high speed milling of GH188 of pair of alloy of cobalt radical high temperature, can get the following verdict. (1) the main factor that every age feed Fz and radial cut wide Ae is influence milling force, milling rate is minorrer to the influence of milling force. (2) cut in relatively lesser radial wide fall with every tine feed, of cutting tool basically wear away area of the knife after be is the largest cut the groove near dark place to wear away, its wear away to bandwidth is spent and develop speed to all exceed other position. After milling dosage increases, the form basically is the invalidation of cutting tool to be cut in axial of the 1/2 on cutting blade what chunk happens near dark place is broken. (3) the main factor that milling rate Vc is durability of influence cutting tool, every tine feed Fz next, the impact that radial cuts wide Ae is the least. (4) when GH188 of milling of real precision work, can use milling rate Vc=80m/min, radial cuts wide Ae=0.

4mm, fz=0 of every tine feed.

The milling dosage of 04mm/z is combined, can assure to have taller cutting tool durability already so (66.

3min) , also can assure lesser milling force (Fy is less than 600N) . In addition, workpiece surface quality and cutting temperature also are the element that the consideration needs in finish machining process, later period need undertakes study further to this two respects. CNC Milling