CN104668598A - Polycrystalline superhard cutting tool and preparation method thereof - Google Patents
Polycrystalline superhard cutting tool and preparation method thereof Download PDFInfo
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- CN104668598A CN104668598A CN201510069940.0A CN201510069940A CN104668598A CN 104668598 A CN104668598 A CN 104668598A CN 201510069940 A CN201510069940 A CN 201510069940A CN 104668598 A CN104668598 A CN 104668598A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/18—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing
- B23B27/20—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing with diamond bits or cutting inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/12—Boron nitride
- B23B2226/125—Boron nitride cubic [CBN]
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- Cutting Tools, Boring Holders, And Turrets (AREA)
- Nonmetal Cutting Devices (AREA)
Abstract
The invention discloses a polycrystalline superhard cutting tool and a preparation method thereof. The polycrystalline superhard cutting tool comprises a cutting tool body part and an edge part, and the edge part is located at the intersection between more than two surfaces of the cutting tool body part; the materials of both the cutting tool body part and the edge part are polycrystalline material, and the average degree of crystallinity of the material of the edge part is higher than the average degree of crystallinity of the material of the cutting tool body part. Since the degree of crystallinity of the material of the edge part is higher than the degree of crystallinity of the material of the cutting tool body part in the polycrystalline superhard cutting tool disclosed by the invention, the stress of the edge is decreased, the hardness of the edge is increased, and thereby the service life of the cutting tool is prolonged. By adopting the metal induction process, the preparation method disclosed by the invention increases the degree of crystallinity of the edge, consequently, the stress of the edge is decreased, moreover, the hardness of the edge is increased, and thereby the service life of the cutting tool is prolonged; the process of the preparation method is simple, is convenient to operate, and is suitable for industrialized mass production.
Description
Technical field
The invention belongs to superhard cutter technical field, be specifically related to a kind of glomerocryst superhard cutter, also relate to a kind of preparation method of glomerocryst superhard cutter simultaneously.
Background technology
In the machined of metal, the cutter of use divides by material and roughly comprises: hard alloy cutter, sintex and glomerocryst superhard cutter.Wherein, glomerocryst superhard cutter hardness is high, long service life, especially may be used for fine finishining, achieves with car generation mill, can not produce the metal waste residue being difficult to recycle, improve working (machining) efficiency, realize Green Machining, be therefore widely applied.
Conventional glomerocryst superhard cutter has polycrystal diamond cutter and polycrystalline CBN cutting tool etc., generally needs to be arranged on knife bar, is then fixed on lathe by knife bar, metal works is carried out to the processing such as turnning and milling plane.As shown in Figure 1, glomerocryst superhard cutter (band chip-breaker 10) generally comprises cutter hub portion 1 and cutting edge portion 2, and the active component in cutting edge portion 2 is the A angle in front, B angle, and the relative C angle in the back side and A angle, B angle, D angle; The active component participation in above-mentioned four cutting edge portions is to processing such as the turning of workpiece, and after the cutting edge wear extent at this position exceedes certain numerical value, cutter is scrapped, and namely reaches service life.
The cutting edge portion of cutter has higher stress, therefore can not be too sharp keen, in order to avoid carrying out cutter tipping in process to workpiece; Traditional method is after grinding cutting edge, then carries out rounding process to cutting edge, makes cutting edge have certain radian.The method shortcoming of above-mentioned reduction cutting edge stress makes blade becoming dull, and when high-speed cutting, blade vibrations are large, and namely occur " shake cutter " phenomenon often said, this phenomenon is degrading the wearing and tearing of cutting edge further, causes decreased tool life.
Summary of the invention
The object of this invention is to provide a kind of glomerocryst superhard cutter, solve short problem in service life that existing cutter causes because cutting edge stress is higher.
Second object of the present invention is to provide a kind of preparation method of glomerocryst superhard cutter.
In order to realize above object, the technical solution adopted in the present invention is:
A kind of glomerocryst superhard cutter, comprise cutter hub portion and cutting edge portion, described cutting edge portion is connected in the intersection on two or more surface, described cutter hub portion; Described cutter hub portion and cutting edge portion material are polycrystalline material, and the average crystallinity of cutting edge portion material is greater than the average crystallinity of described cutter hub portion material.
Described polycrystalline material is Polycrystalline Cubic Boron Nitride or polycrystalline diamond material.
The average crystallinity of described cutting edge portion material is than the average crystallinity large more than 10% of described cutter hub portion material.
The average crystallinity in described cutting edge portion is 40% ~ 60%; The average crystallinity in described cutter hub portion is 30% ~ 50%.
Described cutting edge portion is the convex edge exceeding cutter hub portion; Along the direction away from cutter hub portion, tapering width.
The cross section in described cutting edge portion is triangle, square or rectangular.
The degree of crystallinity of described cutting edge portion material reduces gradually along the direction towards described cutter hub portion.
The crystal region of described cutting edge portion material is layered distribution.
Along the direction away from described cutter hub portion, material crystalline district of described cutting edge portion is horizontal layer distribution, and the crystallizing layer of the crystallizing layer of high-crystallinity and low-crystallinity is spaced distribution.
Along the direction away from described cutter hub portion, material crystalline district of described cutting edge portion is vertical layered distribution, and the crystallizing layer of the crystallizing layer of high-crystallinity and low-crystallinity is spaced distribution.
Described high-crystallinity refers to that degree of crystallinity is 50% ~ 60%; Described low-crystallinity refers to that degree of crystallinity is 40% ~ 45%.
The width of described crystallizing layer is 0.3 ~ 0.5mm.
The degree of crystallinity of cutting edge portion crystallizing layer is all greater than cutter hub portion degree of crystallinity.
Material crystalline district of cutting edge portion is layered distribution, while this structure makes cutting edge have low stress and high hardness, also has excellent toughness, and the performance of the tissue cutting Crack Extension of excellence.
Glomerocryst superhard cutter of the present invention is band chip-breaker or the cutter not with chip-breaker.
A preparation method for above-mentioned glomerocryst superhard cutter, comprises the following steps:
1) get the mould of glomerocryst superhard cutter, put into inducing metal in the forming tank of mould after, place shielding plate at forming tank notch place and forming tank is sealed, obtain sealing moulding groove;
2) step 2 is got) gained sealing moulding groove heating anneal, making inducing metal in forming tank, after melting, is cooled to room temperature, and inducing metal is deposited in each drift angle of forming tank, obtains in forming tank the mould with inducing metal layer;
3) after adding glomerocryst superhard cutter synthesis material in the forming tank with inducing metal layer, place corresponding shielding plate at forming tank notch place, matched moulds assembling forms combination block, carries out HP-HT synthesize, to obtain final product.
Described mould is graphite jig.Step 1) in, be that notch shielding plate being placed on forming tank seals by mould sealing; Described shielding plate is graphite shielding plate.
The forming tank shape of described mould, according to the profile design of required glomerocryst superhard cutter, can be rhombus, triangle, square etc.
Described inducing metal is Powdered.
Described inducing metal is any one or combination in alkali metal, alkaline-earth metal, acieral.Inducing metal is alkali metal stable under normal temperature, as Mg etc., or acieral stable under normal temperature, as Al-Ni, Al-Cr, Al-Mn, Al-Co alloy or the two combination.Inducing metal can be identical with the catalyst of synthesis material, also can be different with the catalyst of synthesis material.
Described synthesis material is the synthesis polycrystalline diamond of this area routine or the synthesis material of Polycrystalline Cubic Boron Nitride.
The amount adding inducing metal can each groove face in forming tank form the metal level that thickness is not more than 2.5mm and is advisable in drift angle place with its melting and after cooling.The amount adding inducing metal cannot form specific continuous print metal level very little; The amount adding inducing metal is also not easily too much, and metal level time too much on each groove face, by there is serious mutual intersection, finally forms metallic object in heaps at corner position, is unfavorable for the keen edge of follow-up formation blade.
Generally, the amount of degree of crystallinity and inducing metal is positive correlation; Crystal metal is more, and the degree of crystallinity of polycrystalline material is higher.
Preferably, the thickness of inducing metal layer is 0.1 ~ 2.0mm.
Add that quality is molding cutter quality 0.5% ~ 1.0% of inducing metal.
Have in the mould of inducing metal layer in forming tank, the Thickness Ratio of individual layer inducing metal layer and molding cutter is 0.5 ~ 2.5:10 ~ 20.
Step 2) in, described heating anneal sealing moulding groove is put into annealing furnace carry out annealing in process.The preferred vacuum annealing of described annealing in process or inert atmosphere annealing.After inducing metal melting, be deposited in each drift angle of forming tank.
Described heating anneal is that sealing moulding groove is heated to 650 ~ 1000 DEG C, insulation 10 ~ 30min.
Step 2) in, the inducing metal layer in forming tank is modified, makes inducing metal layer have triangle, rectangle, trapezoidal or belt structure.Described belt structure is that inducing metal layer band and blank tape are spaced distribution.
Step 3) in, described HP-HT synthesize process is the high pressure apparatus high temperature and high pressure synthesis of this area routine, and high pressure apparatus is cubic hinge press, octahedral high pressure apparatus etc.Raw material needed for HP-HT synthesize is the boron nitride powder of this area routine and the mixture of catalyst.Described catalyst is alkali metal, alkaline-earth metal and nitride thereof, or alkali metal, alkaline-earth metal boron nitride, or the conventional catalyst such as acieral catalyst.
Step 3) in, it is put into synthesis material in forming tank after that matched moulds assembling forms combination block, and compacting also covers upper secondary high graphite flake, above-mentioned mould is covered conducting strip up and down and puts into carbon cup.
In the preparation method of above-mentioned glomerocryst superhard cutter, inducing metal powder is in the process of high-temperature fusion, preferentially be deposited in the drift angle of forming tank, namely the position of tool blade oral area is formed in forming process, mechanism is: at high temperature, inducing metal powder evaporates, and the metallic atom of evaporation falls and is adsorbed in forming tank and forms continuous print metal film, and the metallic atom fallen also has certain probability generation desorb and again escapes; The drift angle place of forming tank, as the boundary line place of two intersecting trough inwall facades, especially the joint place (i.e. the position of drift angle) of boundary line and forming tank lower planes, the metal of escaping is easy to encounter adjacent facade or adjacent plane and occurs again to deposit, namely the metal at especially joint place of the boundary line place probability of escaping is less, thus there occurs the preferential deposition of inducing metal.
Glomerocryst superhard cutter of the present invention can be polycrystalline cubic boron nitride cutter or dimond synneusis cutter.Glomerocryst superhard cutter of the present invention can be solid tool, and namely cutter entirety is polycrystalline material; Also can be brazed shank tool, be welded on carbide alloy by polycrystalline material (being fixed with the cutter hub portion in cutting edge portion) and form cutter.
Glomerocryst superhard cutter of the present invention, comprises cutter hub portion and cutting edge portion, and described cutting edge portion is positioned at the intersection on two or more surface, described cutter hub portion; Described cutter hub portion is identical with cutting edge portion material, be polycrystalline cubic boron nitride or polycrystalline diamond material, the degree of crystallinity of cutting edge portion material is greater than the degree of crystallinity of cutter hub portion material, the stress of cutting edge is reduced, the hardness of cutting edge improves, ensureing that cutting edge portion has less stress and larger hardness when cutting, the toughness in cutter hub portion can not be reduced simultaneously, thus extend cutting-tool's used life.
For polycrystalline material, degree of crystallinity is higher, and its inner potential is lower, and monocrystalline state is minimum energy state, is also the most stable state.Under monocrystalline state, material internal has very little stress, be thus less likely to occur stress induced glomerocryst and burst apart phenomenon, but the maximum sized cubic boron nitride monocrystal that can synthesize at present is still not enough to make blade.
The preparation method of glomerocryst superhard cutter of the present invention, inducing metal is put in the forming tank of mould, heating anneal makes inducing metal melting in forming tank, cooling forms inducing metal layer, then adds glomerocryst superhard cutter synthesis material, carries out HP-HT synthesize; This preparation method, by adopting the technique of metal inducement, improves the degree of crystallinity of cutting edge, thus reduces cutting edge stress, improves edge hardness simultaneously, extends cutting-tool's used life; This preparation method's technique is simple, easy to operate, is applicable to large-scale industrial production.
Accompanying drawing explanation
Fig. 1 is the structural representation of glomerocryst superhard cutter (band chip-breaker);
Fig. 2 is the structural representation of the glomerocryst superhard cutter of embodiment 1;
Fig. 3 is the sectional view figure of Fig. 2;
Fig. 4 is the structural representation of the mould of embodiment 1;
Fig. 5 is the enlarged drawing at A ' place in Fig. 4;
Fig. 6 is the structural representation of the glomerocryst superhard cutter of embodiment 2;
Fig. 7 is the enlarged drawing at the A ' place of the mould of embodiment 2;
Fig. 8 is the structural representation of the glomerocryst superhard cutter of embodiment 5;
Fig. 9 is the structural representation of the glomerocryst superhard cutter of embodiment 6.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further illustrated.
Embodiment 1
The glomerocryst superhard cutter of the present embodiment, as shown in Figure 2,3, Fig. 3 is along the cornerwise sectional view of AB in Fig. 2, described glomerocryst superhard cutter comprises cutter hub portion 1 and cutting edge portion 2, described cutter hub portion 1 is rhombus, and described cutting edge portion 2 is the triangle bodily form, and cutting edge portion 2 is connected in (the drift angle A place of intersection of upper and lower surface, described cutter hub portion 1 and side, the same A in other drift angle places, not shown in FIG.); Described cutter hub portion and cutting edge portion material are Polycrystalline Cubic Boron Nitride, the average crystallinity of cutting edge portion material is 48%, the average crystallinity of cutter hub portion material is 32%, and the average crystallinity of cutting edge portion material is than the average crystallinity large 16% of described cutter hub portion material; Along the direction (on cutter thickness direction) away from described cutter hub portion 1, material crystalline district of described cutting edge portion 2 is horizontal layer distribution, and the crystallizing layer 5 (width is 0.5mm) of high-crystallinity (average out to 52%) is spaced distribution with the crystallizing layer 4 (width is 0.3mm) of low-crystallinity (average out to 40%).
The preparation method of the glomerocryst superhard cutter of the present embodiment, comprises the following steps:
1) mould of glomerocryst superhard cutter is got, this mould is graphite jig, graphite jig have the forming tank corresponding with glomerocryst superhard cutter for molding, inducing metal powder (Mg powder is put in forming tank, concrete addition is 0.7% of glomerocryst superhard material synthesis material quality) after, at forming tank notch place, forming tank seals by placing graphite shielding plate, obtains sealing moulding groove;
2) step 2 is got) gained sealing moulding groove puts into annealing furnace, be heated to 670 DEG C of insulation 20min and carry out vacuum annealing process, make inducing metal in forming tank after melting, be cooled to room temperature, inducing metal is deposited in each drift angle of forming tank, respective drift angle place groove inwall forms continuous print inducing metal layer, inducing metal layer is modified, as Fig. 4, (Fig. 4 shown in 5, in 5, 6 is mould, 7 is forming tank, A ' is the forming tank drift angle corresponding with A angle on cutter, a is forming tank groove bottom, b and c is forming tank sidewall), at forming tank 7 corresponding drift angle A ' place groove madial wall b, c upper formation width is 0.5mm, thickness is that the blank tape 9 that inducing metal layer band 8 and the width of 0.6mm is 0.3mm is spaced, horizontal distribution is (corresponding with target products formed, the same A ' in other drift angle places, not shown in FIG.), obtain the mould in forming tank with inducing metal layer,
3) in the forming tank with inducing metal layer, adding glomerocryst superhard cutter synthesis material, (described synthesis material is made up of the component of following mass percentage: boron nitride 90%, titanium carbide 5%, aluminium 4%, silicon 1%; Average grain diameter 5 μm), place corresponding graphite shielding plate after compacting at forming tank notch place and form sub-assembly, conducting strip is prevented up and down at described sub-assembly, and be placed in carbon cup and form combination block, carry out HP-HT synthesize, the cutter blank removing synthesis carries out surface finish, obtains described glomerocryst superhard cutter.
Embodiment 2
The glomerocryst superhard cutter of the present embodiment, difference from Example 1 is, as shown in Figure 6, along the direction (on cutter thickness direction) away from described cutter hub portion 1, material crystalline district of described cutting edge portion 2 is vertical layered distribution, and the crystallizing layer 5 (width is 0.4mm) of high-crystallinity (average out to 55%) is spaced distribution with the crystallizing layer 4 (width is 0.3mm) of low-crystallinity (average out to 41%).
The preparation method of the glomerocryst superhard cutter of the present embodiment, comprises the following steps:
1) mould of glomerocryst superhard cutter is got, this mould is graphite jig, graphite jig have the forming tank corresponding with glomerocryst superhard cutter for molding, inducing metal powder (Al-Ni alloy is put in forming tank, concrete addition is 1.0% of glomerocryst superhard cutter synthesis material quality) after, at forming tank notch place, forming tank seals by placing graphite shielding plate, obtains sealing moulding groove;
2) step 2 is got) gained sealing moulding groove puts into annealing furnace, be heated to 750 DEG C of insulation 30min and carry out vacuum annealing process, make inducing metal in forming tank after melting, be cooled to room temperature, inducing metal is deposited in each drift angle of forming tank, respective drift angle place groove inwall forms continuous print inducing metal layer, inducing metal layer is modified, as shown in Figure 7, it is 0.4mm that forming tank A ' drift angle place groove bottom a forms width, thickness be blank tape that inducing metal layer band and the width of 1mm is 0.3mm be spaced distribute (corresponding with target products formed, the same A ' in other drift angle places, C, the inducing metal layer at D drift angle place is positioned on graphite shielding plate), obtain the mould in forming tank with inducing metal layer,
3) in the forming tank with inducing metal layer, adding glomerocryst superhard cutter synthesis material, (described synthesis material is made up of the component of following mass percentage: boron nitride 90%, titanium carbide 5%, aluminium 4%, silicon 1%; Average grain diameter 5 μm), place corresponding graphite shielding plate after compacting at forming tank notch place and form sub-assembly, conducting strip is prevented up and down at described sub-assembly, and be placed in carbon cup and form combination block, carry out HP-HT synthesize, the cutter blank removing synthesis carries out surface finish, obtains described glomerocryst superhard cutter.
Embodiment 3
The glomerocryst superhard cutter of the present embodiment, difference from Example 1 is, described cutter hub portion and cutting edge portion material are polycrystalline diamond material; Along the direction (cutter thickness direction) towards described cutter hub portion, the degree of crystallinity of described cutting edge portion material reduces gradually, and degree of crystallinity is reduced to 43% from 55%, and average crystallinity is 50%; The degree of crystallinity of described cutter hub portion material is 37%.
The preparation method of the glomerocryst superhard cutter of the present embodiment, comprises the following steps:
1) mould of glomerocryst superhard cutter is got, this mould is graphite jig, graphite jig have the forming tank corresponding with glomerocryst superhard cutter for molding, inducing metal powder (Al-Cr alloy is put in forming tank, concrete addition is 0.7% of glomerocryst superhard material synthesis material quality) after, at forming tank notch place, forming tank seals by placing graphite shielding plate, obtains sealing moulding groove;
2) step 2 is got) gained sealing moulding groove puts into annealing furnace, be heated to 730 DEG C of insulation 25min and carry out vacuum annealing process, make inducing metal in forming tank after melting, be cooled to room temperature, inducing metal is deposited in each drift angle of forming tank, respective drift angle place groove madial wall forms continuous print inducing metal layer, inducing metal layer is modified, form rectangle, along the direction (cutter thickness direction) towards described cutter hub portion, the thickness of inducing metal layer reduces (being reduced to 0.4mm thickness from 0.4mm thickness) gradually, obtain the mould in forming tank with inducing metal layer,
3) in the forming tank with inducing metal layer, adding glomerocryst superhard cutter synthesis material, (described synthesis material comprises the component of following mass percentage: diamond 92%, cobalt 2%, nickel 3%; Average grain diameter 10 μm), place corresponding graphite shielding plate after compacting at forming tank notch place and form sub-assembly, conducting strip is prevented up and down at described sub-assembly, and be placed in carbon cup and form combination block, carry out HP-HT synthesize, the cutter blank removing synthesis carries out surface finish, obtains described glomerocryst superhard cutter.
Embodiment 4
The glomerocryst superhard cutter of the present embodiment, described cutter hub portion and cutting edge portion material are Polycrystalline Cubic Boron Nitride; Difference from Example 1 is: described cutting edge portion is along the direction (direction vertical with cutter thickness) towards described cutter hub portion, and the degree of crystallinity of described cutting edge portion material reduces gradually, and degree of crystallinity is reduced to 43% from 55%, and average crystallinity is 51%; The degree of crystallinity of described cutter hub portion material is 40%.
The preparation method of the glomerocryst superhard cutter of the present embodiment, comprises the following steps:
1) mould of glomerocryst superhard cutter is got, this mould is graphite jig, graphite jig have the forming tank corresponding with glomerocryst superhard cutter for molding, inducing metal powder (Al-Mg alloy is put in forming tank, concrete addition is 0.6% of glomerocryst superhard material synthesis material quality) after, at forming tank notch place, forming tank seals by placing graphite shielding plate, obtains sealing moulding groove;
2) step 2 is got) gained sealing moulding groove puts into annealing furnace, be heated to 650 DEG C of insulation 25min and carry out vacuum annealing process, make inducing metal in forming tank after melting, be cooled to room temperature, inducing metal is deposited in each drift angle of forming tank, inducing metal layer is modified, right angled triangle is formed in each drift angle place groove bottom and end face (on graphite shielding plate), along the direction (direction vertical with cutter thickness) towards described cutter hub portion, the thickness of inducing metal layer reduces (being reduced to 0.5mm thickness from 1.0mm thickness) gradually, obtain the mould in forming tank with inducing metal layer,
3) (described synthesis material comprises the component of following mass percentage: cubic boron nitride 93% in the forming tank with inducing metal layer, to add glomerocryst superhard cutter synthesis material; Main bonding agent is aluminium nitride; Average grain diameter 10 μm), place corresponding graphite shielding plate after compacting at forming tank notch place and form sub-assembly, conducting strip is prevented up and down at described sub-assembly, and be placed in carbon cup and form combination block, carry out HP-HT synthesize, the cutter blank removing synthesis carries out surface finish, obtains described glomerocryst superhard cutter.
Embodiment 5
The glomerocryst superhard cutter of the present embodiment, as shown in Fig. 8 (enlarged drawing in cutting edge portion), is the cutter (outward just as Fig. 1) with chip-breaker 10, specifically on the basis of embodiment 1 gained glomerocryst superhard cutter, processes chip-breaker 10.
Embodiment 6
The glomerocryst superhard cutter of the present embodiment, as shown in Fig. 9 (enlarged drawing in cutting edge portion), is the cutter (outward just as Fig. 1) with chip-breaker 10, specifically on the basis of embodiment 2 gained glomerocryst superhard cutter, processes chip-breaker 10.
Experimental example
The serviceability of this experimental example to embodiment 1-4 gained cutter detects.Detection method: Example 1-4 gained cutter and each 10 of comparative example cutter, same model, cutting workpiece is the steel part of diameter 150mm, length 200mm, and cutting and removing thickness is 5mm, and machining condition is: cutting-in: 0.2mm, feeding: 0.1mm/round.After cutting completes, cutter wearing and tearing after measurement (rear cutter wear extent is generally the standard judging that blade is scrapped), obtain the mean value of the rear cutter wear extent of ten embodiment blades, and the mean value contrast of comparative example.Testing result is as shown in table 1.
Wherein the preparation method of comparative example cutter is: in the forming tank of graphite jig, add glomerocryst superhard cutter synthesis material (concrete formula is with embodiment synthesis material formula), sub-assembly is formed at forming tank notch place placing graphite shielding plate after compacting, conducting strip is prevented up and down at described sub-assembly, and be placed in carbon cup and form combination block, carry out HP-HT synthesize, the cutter blank removing synthesis carries out surface finish, obtains described glomerocryst superhard cutter.
Table 1 serviceability testing result
As can be seen from Table 1, the rear cutter wearing and tearing of embodiment 1-4 gained glomerocryst superhard cutter are no more than 0.4mm, well below the rear cutter wear extent of comparative example.Experimental result shows: glomerocryst superhard cutter of the present invention, and cutting edge portion has less stress and larger hardness when cutting, and cutter has excellent serviceability and longer service life.
Claims (10)
1. a glomerocryst superhard cutter, is characterized in that: comprise cutter hub portion and cutting edge portion, and described cutting edge portion is connected in the intersection on two or more surface, described cutter hub portion; Described cutter hub portion and cutting edge portion material are polycrystalline material, and the average crystallinity of cutting edge portion material is greater than the average crystallinity of described cutter hub portion material.
2. glomerocryst superhard cutter according to claim 1, is characterized in that: the average crystallinity of described cutting edge portion material is than the average crystallinity large more than 10% of described cutter hub portion material.
3. glomerocryst superhard cutter according to claim 1 and 2, is characterized in that: the degree of crystallinity of described cutting edge portion material reduces gradually along the direction towards described cutter hub portion.
4. glomerocryst superhard cutter according to claim 1 and 2, is characterized in that: the crystal region of described cutting edge portion material is layered distribution.
5. glomerocryst superhard cutter according to claim 4, is characterized in that: along the direction away from described cutter hub portion, and material crystalline district of described cutting edge portion is horizontal layer distribution, and the crystallizing layer of the crystallizing layer of high-crystallinity and low-crystallinity is spaced distribution.
6. glomerocryst superhard cutter according to claim 4, is characterized in that: along the direction away from described cutter hub portion, material crystalline district of described cutting edge portion is vertical layered distribution, and the crystallizing layer of the crystallizing layer of high-crystallinity and low-crystallinity is spaced distribution.
7. a preparation method for glomerocryst superhard cutter as claimed in claim 1, is characterized in that: comprise the following steps:
1) get the mould of glomerocryst superhard cutter, put into inducing metal in the forming tank of mould after, place shielding plate at forming tank notch place and forming tank is sealed, obtain sealing moulding groove;
2) step 2 is got) gained sealing moulding groove heating anneal, making inducing metal in forming tank, after melting, is cooled to room temperature, and inducing metal is deposited in each drift angle of forming tank, obtains in forming tank the mould with inducing metal layer;
3) after adding glomerocryst superhard cutter synthesis material in the forming tank with inducing metal layer, place corresponding shielding plate at forming tank notch place, matched moulds assembling forms combination block, carries out HP-HT synthesize, to obtain final product.
8. the preparation method of glomerocryst superhard cutter according to claim 7, is characterized in that: described mould is graphite jig.
9. the preparation method of glomerocryst superhard cutter according to claim 7, is characterized in that: described inducing metal is any one or combination in alkali metal, alkaline-earth metal, acieral.
10. the preparation method of glomerocryst superhard cutter according to claim 7, is characterized in that: step 2) in, the inducing metal layer in forming tank is modified, makes inducing metal layer have triangle, rectangle, trapezoidal or belt structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111842950A (en) * | 2020-08-17 | 2020-10-30 | 嘉兴沃尔德金刚石工具有限公司 | Negative chamfering tool |
| CN115805666A (en) * | 2022-12-16 | 2023-03-17 | 汨罗市福缘新材料有限公司 | Fettling milling cutter suitable for graphite product |
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| CN204094170U (en) * | 2014-08-01 | 2015-01-14 | 河南富耐克超硬材料股份有限公司 | A kind of Superhard composite materials and matrix thereof |
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| CN203156083U (en) * | 2013-03-19 | 2013-08-28 | 河南富耐克超硬材料股份有限公司 | Compound tool bit and cutter with compound tool bit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111842950A (en) * | 2020-08-17 | 2020-10-30 | 嘉兴沃尔德金刚石工具有限公司 | Negative chamfering tool |
| CN115805666A (en) * | 2022-12-16 | 2023-03-17 | 汨罗市福缘新材料有限公司 | Fettling milling cutter suitable for graphite product |
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| CN104668598B (en) | 2017-03-22 |
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