CN205167262U - Be applied to diamond coated cutting tool among graphite high -speed machining - Google Patents

Be applied to diamond coated cutting tool among graphite high -speed machining Download PDF

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CN205167262U
CN205167262U CN201521040702.9U CN201521040702U CN205167262U CN 205167262 U CN205167262 U CN 205167262U CN 201521040702 U CN201521040702 U CN 201521040702U CN 205167262 U CN205167262 U CN 205167262U
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graphite
cutting
diamond
angle
cutter
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CN201521040702.9U
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王成勇
周玉海
郑李娟
王启民
代伟
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Guangdong University of Technology
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Guangdong University of Technology
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Abstract

The utility model discloses a be applied to diamond coated cutting tool among graphite high -speed machining, the utility model discloses the cutter is including the cutting knife tip, and cutting part and centre gripping handle of a knife, centre gripping handle of a knife are cemented carbide substrate, cutting knife tip and the cutting part diamond coating that coats on the matrix material, its characterized in that: the end sword anterior angle gamma o1 of cutting part is 2~6, and end edge clearance angle alpha 1 is 5~13, and all sword anterior angle gamma o2 are 5~15, and all edge clearance angle alpha 2 are 10~14, and helical angle beta is 15~45. The utility model has the characteristics of hardness is high, stand wear and tear, and coefficient of friction is little, and the heat conductivity is good etc, it is the ideal cutter of making cutting graphite to be applicable to the high -speed machining of graphite.

Description

Be applied to the diamond-coated tools in graphite High-speed machining
Technical field
The utility model relates to field of machining, is specially a kind of diamond-coated tools be applied in graphite High-speed machining.
Background technology
Isotropism cold isostatic pressing formed graphite has the mechanical and physical performance than common die-pressed graphite excellence, and its particle does not have the abilities such as preferred orientation therefore intensity and conduction all consistent in all directions, is that the world today develops one of industrial materials the most rapidly.Isotropic graphite has higher elevated temperature strength, low thermal coefficient of expansion, preferably machinability and good heat, electrical conductivity, heat-resisting quantity, stable chemical performance, plasticity, the advantages such as good thermal shock.Be widely used in mould EDM spark discharge, solar energy graphite field, metallurgy, machinery, building, electrically, electronics, Aero-Space, nuclear industry, coloured and noble metal is industrial, glass and quartz industry, semiconductor and the field such as optoelectronics industry chemical industry and environmental project.Compared with copper, graphite electrode has that intensity is high, thermal deformation and the advantage such as consumption of electrode is little, and be suitable for the electrode with complex-shaped surface mould structures such as minute aperture, thin-walled and fins, graphite electrode just progressively replaces copper electrode becomes spark machined main flow.As the spark machined user in the U.S. more than 96% selects graphite to make electrode material, in other industrially developed country as countries such as Japan and Switzerland, graphite also occupies main status in electrode material for electric discharge machining.
Graphite is typical layered structure fragile material, and mechanical strength is poor, adds and easily collapses broken man-hour, and tool wear is serious, is typical difficult-to-machine material.The graphite parts can only processing simple shape processed by conventional car, milling, mill, cannot meet the requirement of various complicated shape electrode.High-speed milling has that process velocity is high, cutting force is little, temperature is low and the feature such as workpiece surface quality is good, and may be used for the electrode of manufacturing complex shapes, is one of main machining method of accurate complicated graphite electrode.
There is the microscopic defects such as the tissue defects of pore, crackle and granule boundary in heterogeneous body graphite inside, is the typical nonmetal fragility friable material of one.Produce in working angles and finely collapse the chip of flour dirt, easy bonding is deposited on front and rear knife face and machined surface, violent friction and impact are produced to cutting edge, causes the even tipping inefficacy of cutter generation early damage, Fast Wearing, cutting force after tool wear passivation, can be caused sharply to rise.Fragility graphite easily collapses angle when impacting by cutting force, collapses limit even brittle fracture and scrap phenomenon.Tool wear not only increases processing cost, and causes the surface quality and the dimensional accuracy that are difficult to guarantee workpiece, and usually, cutter accounts for more than 1/3 of machining graphite totle drilling cost.So reduce tool wear to improve working (machining) efficiency and workpiece quality, become the problem that graphite machining needs solution badly.
Graphite bite has hard alloy cutter, carbide alloy coating cutter, polycrystal diamond cutter etc.During hard alloy cutter high-speed milling graphite, tool wear is serious, and during TiAlN coated cutting tool processing graphite, the life-span has no and significantly improves.Less but the shape of tool of polycrystal diamond cutter wearing and tearing is difficult to meet complicated electrode requirement.Diamond-coated tools have high hardness and wearability, low-friction coefficient, high elastic modulus, high thermal conductance, low thermal coefficient of expansion and with the advantage such as nonferrous metal affinity is little.May be used for the Precision Machining of machining of non-metallic hard brittle material as graphite, high abrasion resisting material, composite, silumin and other toughness nonferrous materials.
There is the relevant report of many sections of diamond-coated tools abroad, but mainly towards pottery, printed substrate, non ferrous metal and their alloy, engineering plastics, non-metal stupalith, Al 2o 3the difficult-to-machine material such as floor and SiCp/Al is processed, and about development diamond-coated tools, also application is fewer with the bibliographical information of processing graphite aspect.As Yan Guoxiang, " diamond-coated tools and the application in fibrous composite processing thereof " patent CN102211218B that Shen Fenglei writes, relate to a kind of diamond-coated tools and the cutter for the composite processing such as carbon fiber or glass fibre thereof, this cutter is not suitable for machining graphite." a kind of preparation method of diamond-coated tools and the application of the method gained diamond-coated tools in printed substrate preparation " patent CN103397314A that Wang Tao writes, utility model diamond-coated tools is in the application in printed substrate." nano diamond coating cutter and the application in oral restoration Ceramic manufacturing thereof " patent CN103770223A that Yan Guoxiang writes, utility model relates to a kind of nano diamond coating cutter and the application in oral restoration Ceramic manufacturing thereof.G.P. " diamond-coated tools and preparation method thereof " patent CN1136292A that lattice granny rag etc. are write describes the preparation method of diamond coatings blade, and this cutter is also not suitable for manufacturing complex shapes graphite." diamond-coated tools is to the processing method of precise and fine graphite electrodes " patent CN201010234411.9 that Zhang Tai writes relates to the processing method of a kind of diamond-coated tools to precise and fine graphite electrodes, mainly have studied Cutting Process parameter, do not relate to the contents such as graphite cutting-tool angle optimization.
During current graphite High-speed machining, Some Enterprises also selects the universal diamond-coated tools in cutter market, due to the diamond-coated tools selected and non-expert design for graphite material High-speed machining characteristic, due to shear blade anterior angle, the relief angle of designed cutter, rake angle, relief angle, and helix angle is difficult to meet graphite material processing particular/special requirement.Frequently occur that diamond-coated tools most surfaces is intact when there is diamond-coated tools High-speed machining graphite in actual use procedure, but occurred wearing and tearing, disrepair phenomenon in advance at point of a knife or other position of cutting edge.The unreasonable graphite workpiece accuracy causing processing of coated cutting tool angle design declines, and whole cutter is scrapped in advance and produce huge waste.Relevant development graphite High-speed machining special diamond coated cutting tool is also under test at present, and in tool matrix material, cutting-tool angle result and coating process, maturation causes expensive not enough.Select the cutter material of appropriate graphite processing, cutter structure and angle, improve the machinability of cutter life and raising graphite machining, current Patents and bibliographical information are very few.
In sum, special at present to develop diamond-coated tools report for graphite high-speed cutting processing very few, and widely used in machining graphite field is not ordinary rigid alloy cutter, not the special dedicated tool designed for machining graphite characteristic.During hard alloy cutter high-speed milling graphite, tool wear is serious, need check tool wear situation in time and frequently change cutter, in large scale or accurate electrode machining, application is limited, during TiAlN coated cutting tool processing graphite, the life-span has no and significantly improves, polycrystal diamond cutter wearing and tearing are less, but the shape of tool is difficult to meet complicated electrode requirement.For graphite cutter, design suitable geometric angle, contribute to reducing cutting-impact and vibration, graphite workpiece in process is avoided to collapse broken, the selection of cutting-tool angle simultaneously has direct impact to cutting force, cutting vibration and tool wear, so it is angularly significant to design suitable tool orthogonal rake, relief angle, helical angle.The optimization of cutter can realize shortening the electrode manufacturing cycle, and the improving product market competitiveness, has material impact to whole graphite product manufacturing.
Utility model content
The purpose of this utility model is to provide a kind of diamond-coated tools, is applicable in graphite High-speed machining.Considering the impact of tool wear, cutting force and vibration, by optimizing the geometric angle of cutting tool, improving the overall cutting ability of cutter.
The utility model discloses a kind of diamond-coated tools be applied in graphite High-speed machining, comprise cutting tips, blade and clamping handle of a knife, clamping handle of a knife is hard alloy substrate, cutting tips and blade are coated with diamond coatings on matrix material, the shear blade anterior angle γ o of blade 1be 2 ° ~ 6 °, shear blade relief angle α 1be 5 ° ~ 13 °, rake angle γ o 2be 5 ° ~ 15 °, all edge clearance angle α 2be 10 ° ~ 14 °, helixangleβ is 15 ° ~ 45 °.
Further, described cutting tips and the matrix material of blade are Talide, and wherein the mass percentage of cobalt is no more than 6%; Vanadium carbide or titanium carbide or other mixture ratio be not higher than 1%.
Further, the thickness of described diamond coatings is 7 ~ 20 μm.
Wherein, described cutting tips is provided with some dust chip areas in cutting direction.
Preferably, the shear blade anterior angle γ o of described blade 1be 4 °, shear blade relief angle α 1be 9 °, rake angle γ o 2be 10 °, all edge clearance angle α 2be 14 °, helixangleβ is 30 °.
Preferably, the roughness <0.8 of described blade.
The utility model has following beneficial effect:
1, the utility model is by arranging the geometric angle of cutter, contribute to reducing cutting-impact and vibration, graphite workpiece in process is avoided to collapse broken, the selection of cutting-tool angle simultaneously has direct impact to cutting force, cutting vibration and tool wear: when adopting shear blade anterior angle 2 ° ~ 6 °, rake angle 5 ° ~ 15 ° of processing graphites, cutting edge roundness intensity is better, and performance that is shock-resistant and friction is good.Shear blade relief angle 5 ° ~ 13 °, all edge clearance angles 10 ° ~ 14 °, ensure that cutting edge roundness intensity and cutting vibration stability.Adopt comparatively low pitch angle 15 ° ~ 45 ° time, same cutting edge is cut graphite workpiece simultaneously, improve Tool in Cutting efficiency, and tool wear, cutting force and impulsive force is within cutter tolerance range.Depart from the degree of surface of the work greatly according to crossing large helix angle resultant tool force direction, because graphite collapses broken, cutting-impact that is that cause aggravates, thus causes tool wear, Milling Force and cutting vibration to increase.The utility model considers the impact of tool wear, cutting force and vibration, is tested by design science rational factor, optimizes the anterior angle to the shear blade of graphite cutting tool and Zhou Ren, relief angle and helical angle geometric angle, improves the overall cutting ability of cutter.
2, diamond-coated tools hardness ratio TiAlN (2600 ~ 2800HV) of the present utility model and CBN (3400 ~ 4500HV) all high, high case hardness makes diamond-coated tools very easily cut hard crisp graphite, and effectively can overcome the fretting wear of graphite dust to tool surface.Coefficient of friction I subtracts and reduces cutting force and cutting temperature, avoids diamond-coated tools in oxidation or graphitization, can obtain high manufacturing accuracy and machined surface quality.
3, under the utility model cutter room temperature, thermal conductivity factor is higher than ordinary rigid alloy cutter thermal conductivity factor, and good heat conductivility makes diamond-coated tools derive heat in metal cutting rapidly, and tool surface temperature is not substantially by the impact of cutting temperature.Elastic modulus E exceeds half than inserted tool, makes cutter have good cutting ability.The features such as it is high, wear-resistant that diamond thin has hardness, and coefficient of friction is little, and thermal conductivity is good manufacture to cut graphite ideal material.
Accompanying drawing explanation
Fig. 1 is perspective view of the present utility model.
Fig. 2 is the B place enlarged diagram of Fig. 1.
Fig. 3 is schematic front view of the present utility model.
Fig. 4 is the A-A generalized section of Fig. 3.
Fig. 5 is the C place enlarged diagram of Fig. 3.
Fig. 6 is the utility model tool sharpening graphite rear surface microstructure.
Primary clustering symbol description:
1: cutting tips, 2: blade, 3: clamping handle of a knife, 4: dust chip area
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.
As shown in Figure 1 and Figure 2, the utility model discloses a kind of diamond-coated tools be applied in graphite High-speed machining, comprise cutting tips 1, blade 2 and clamping handle of a knife 3, clamping handle of a knife 3 is hard alloy substrate, and cutting tips 1 and blade 2 are coated with diamond coatings on matrix material.The matrix material of cutting tips 1 and blade 2 is Talide.The thickness of diamond coatings is 7-20 μm.Cutting tips 1 is provided with some dust chip areas 4 in cutting direction, is convenient to effectively to discharge the graphite powder cutting and formed when graphite cuts, and reduces breaking phenomenon, obviously reduces tool change time, improve working (machining) efficiency.
In the present embodiment, diamond film coating layer flat-bottom milling cutter, overall length 60mm, the long 24mm of sword, 4 teeth, cutting tip diameter 6mm.Head diameter 2-10mm, specifically can be 2mm, the sizes such as 4mm, 6mm, 8mm, 10mm, and as head diameter≤4mm, shank diameter is 4mm; As head diameter > 4mm, shank diameter is identical with head diameter.Cutting edge keeps sharp, and rake face is smooth, does not allow jagged, spring corner saw tooth, ripple etc. to affect familiar lacunas.Bottom land is smooth, smooth, has not allowed the substrate imperfection such as tool marks, oscillation mark, burnt burn.The roughness Ra <0.8 of blade.The roughness of remainder is 0.8.
As seen in figures 3-5, the shear blade anterior angle γ o of blade 1be 2 ° ~ 6 °, shear blade relief angle α 1be 5 ° ~ 13 °, rake angle γ o 2be 5 ° ~ 15 °, all edge clearance angle α 2be 10 ° ~ 14 °, helixangleβ is 15 ° ~ 45 °.By table 1, three groups of cutting-tool angles are set.
Table 1.#1 ~ #3 cutting-tool angle parameter
Sequence number Shear blade anterior angle γ o 1 Shear blade relief angle α 1 Rake angle γ o 2 Week edge clearance angle α 2 Helixangleβ
#1 10° 15°
#2 10° 14° 30°
#3 13° 15° 14° 45°
The setting of the utility model shear blade anterior angle, rake angle makes cutting edge roundness intensity better, and performance that is shock-resistant and friction is good.The setting of shear blade relief angle, all edge clearance angles ensure that cutting edge roundness intensity and cutting vibration stability.Improve Tool in Cutting efficiency when the setting of helical angle makes same cutting edge to be cut simultaneously graphite workpiece, and tool wear, cutting force and impulsive force are within cutter tolerance range.
Through the cutter that the utility model prepares, under room temperature, thermal conductivity factor significantly improves that (hard alloy cutter thermal conductivity factor is only 80 ~ 100.m -1.K -1).Good heat conductivility makes diamond-coated tools derive heat in metal cutting rapidly, and tool surface temperature is not substantially by the impact of cutting temperature.Elastic modulus E, exceeds half than inserted tool, makes cutter have good cutting ability.Hardness ratio TiAlN (2600 ~ 2800HV) and the CBN (3400 ~ 4500HV) of the utility model cutter are high, high case hardness makes diamond-coated tools very easily cut hard crisp graphite, and effectively can overcome the fretting wear of graphite dust to tool surface.Coefficient of friction I subtracts and reduces cutting force and cutting temperature, avoids diamond-coated tools in oxidation or graphitization, can obtain high manufacturing accuracy and machined surface quality.
Cutter prepared by the utility model is mainly used in during graphite High-speed machining produces, and Fig. 6 is the microstructure of 2# cutter high-speed cutting graphite surface, and as can be seen from the figure the smooth nothing of graphite surface is obviously damaged and collapse limit, ensure that the surface quality of graphite parts.Through experimental demonstration, this cutter cutter wear of the tool flank width after 500 meters of cutting strokes is 0.01mm, graphite table roughness Ra is 0.84 μm, under identical cutting machines and technological parameter condition, compare ordinary rigid alloy cutter, the diamond coatings life-span improves 3 ~ 5 times, graphite surface Quality advance 30%.
The utility model is compared with normal diamond coated cutting tool, and service life will be grown, and effectively can overcome the fretting wear of graphite dust to tool surface, and obviously can reduce process due to graphite thin-wall part and collapse angle, collapse limit even brittle fracture and scrap phenomenon.
The above, be only the utility model preferably detailed description of the invention, is anyly familiar with those skilled in the art in the technical scope that the utility model discloses, the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.

Claims (6)

1. be applied to the diamond-coated tools in graphite High-speed machining, comprise cutting tips, blade and clamping handle of a knife, clamping handle of a knife is hard alloy substrate, described cutting tips and blade are coated with diamond coatings on matrix material, it is characterized in that: the shear blade anterior angle γ o of blade 1be 2 ° ~ 6 °, shear blade relief angle α 1be 5 ° ~ 13 °, rake angle γ o 2be 5 ° ~ 15 °, all edge clearance angle α 2be 10 ° ~ 14 °, helixangleβ is 15 ° ~ 45 °.
2. be applied to the diamond-coated tools in graphite High-speed machining as claimed in claim 1, it is characterized in that: described cutting tips and the matrix material of blade are Talide.
3. be applied to the diamond-coated tools in graphite High-speed machining as claimed in claim 1 or 2, it is characterized in that: the thickness of described diamond coatings is 7 ~ 20 μm.
4. be applied to the diamond-coated tools in graphite High-speed machining as claimed in claim 1 or 2, it is characterized in that: described cutting tips is provided with some dust chip areas in cutting direction.
5. be applied to the diamond-coated tools in graphite High-speed machining as claimed in claim 1 or 2, it is characterized in that: the shear blade anterior angle γ o of described blade 1be 4 °, shear blade relief angle α 1be 9 °, rake angle γ o 2be 10 °, all edge clearance angle α 2be 14 °, helixangleβ is 30 °.
6. be applied to the diamond-coated tools in graphite High-speed machining as claimed in claim 1, it is characterized in that: the roughness <0.8 of described blade.
CN201521040702.9U 2015-12-14 2015-12-14 Be applied to diamond coated cutting tool among graphite high -speed machining Active CN205167262U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105563665A (en) * 2015-12-14 2016-05-11 广东工业大学 Diamond coating cutter, and preparation method and application thereof in high speed graphite processing
CN108637338A (en) * 2018-05-21 2018-10-12 浙江普菲特切削工具有限公司 A kind of Strengthening and Toughening cermet material and the slotting cutter being made from it
CN109397549A (en) * 2018-09-26 2019-03-01 广东工业大学 The application of diamond coatings silicon nitride ceramics solid tool and preparation method thereof and cutter in graphite
TWI693293B (en) * 2018-12-29 2020-05-11 大陸商深圳市金洲精工科技股份有限公司 Cutter with hard coating and manufacturing method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105563665A (en) * 2015-12-14 2016-05-11 广东工业大学 Diamond coating cutter, and preparation method and application thereof in high speed graphite processing
CN108637338A (en) * 2018-05-21 2018-10-12 浙江普菲特切削工具有限公司 A kind of Strengthening and Toughening cermet material and the slotting cutter being made from it
CN109397549A (en) * 2018-09-26 2019-03-01 广东工业大学 The application of diamond coatings silicon nitride ceramics solid tool and preparation method thereof and cutter in graphite
TWI693293B (en) * 2018-12-29 2020-05-11 大陸商深圳市金洲精工科技股份有限公司 Cutter with hard coating and manufacturing method thereof

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