CN109465449A - A kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter - Google Patents
A kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter Download PDFInfo
- Publication number
- CN109465449A CN109465449A CN201910012915.7A CN201910012915A CN109465449A CN 109465449 A CN109465449 A CN 109465449A CN 201910012915 A CN201910012915 A CN 201910012915A CN 109465449 A CN109465449 A CN 109465449A
- Authority
- CN
- China
- Prior art keywords
- sintering
- hard alloy
- sintering mold
- mold
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 195
- 239000000956 alloy Substances 0.000 title claims abstract description 109
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000009286 beneficial effect Effects 0.000 title claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 51
- 229910002804 graphite Inorganic materials 0.000 claims description 51
- 239000010439 graphite Substances 0.000 claims description 51
- 238000005259 measurement Methods 0.000 claims description 34
- 230000005855 radiation Effects 0.000 claims description 17
- 238000001291 vacuum drying Methods 0.000 claims description 17
- 238000009792 diffusion process Methods 0.000 claims description 16
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000009760 electrical discharge machining Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000000465 moulding Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 238000005054 agglomeration Methods 0.000 abstract 1
- 230000002776 aggregation Effects 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000000280 densification Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
A kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter, the invention belongs to hard alloy pre-alloyed powder sintering and moulding technology fields, the present invention is to solve the problems, such as that larger ratio of height to diameter complex profile hard alloy cutter cannot achieve the quick near-net-shape of high quality in the prior art, the design method mainly use the method for vacuum discharge plasma agglomeration directly by hard alloy pre-alloyed powder in complicated die sinter molding, wire cutting technology is recycled to carry out Precision Machining, to obtain larger ratio of height to diameter hard alloy complex profile 3-edge surgical knife tool, present invention is mainly used for the preparations of the biggish hard alloy cutter thermal sintering of ratio of height to diameter.
Description
Technical field
The invention belongs to powder sintered field shaping techniques, beneficial more particularly to a kind of larger ratio of height to diameter hard alloy cutter
Rub Fast Sintering forming method.
Background technique
Galvanized steel plain sheet has good corrosion resistance, is widely used in building, electric appliance, transport due to the zinc coat on its surface
Etc. industries.During galvanized steel sheet resistance spot welding, since zinc coat can penetrate into copper electrode cap, in the ormolu that surface is formed
Layer will cause the increase of electrode end surface diameter, and welding quality is greatly reduced.Therefore, the hard with complex profile is generallyd use to close
Golden 3-edge surgical knife tool carries out timely reconditioning to copper electrode cap.
Currently, the preparation of complex profile hard alloy cutter generally includes ingredient, ball milling, drying, wipes sieve, green compact, sintering
Etc. working procedures, cause the production cycle long, production efficiency is low, high production cost.It is higher especially in vacuum heating-press sintering
Sintering temperature, will lead to hard alloy for a long time exposure at high temperature, make its internal grain fast growth, hard be greatly reduced
The performance of alloy cutter.In addition, if unsticking mixture is not thorough during the sintering process, the sintering of hard alloy cutter also will affect
Quality.If sinter molding can effectively shorten the technological process of production directly in high-strength graphite by hard alloy prealloy powder, mention
High efficiency.During the sintering process, the densification that hard alloy prealloy powder can be substantially shunk by volume to realize sintering.
But the metal powder being in contact with graphite jig type chamber will receive reverse friction power when shrinking, and lead to the flowing of prealloy powder
Property reduce, hinder graphite ram pressures transmitting, seriously affect sintered products densification and homogenization degree.Especially pair
In the biggish sintered products of ratio of height to diameter, densification degree is generally difficult to meet requirement.Therefore, big height how is effectively improved
The sintering quality of diameter ratio (ratio of cutter height and tool base diameter is greater than 1) complex profile hard alloy cutter, realizes its height
The quick near-net-shape technology of preparing of quality, development and application to larger ratio of height to diameter complex profile hard alloy cutter have important meaning
Justice.
Summary of the invention
The present invention is to solve in the prior art that cannot achieve high quality quick for larger ratio of height to diameter complex profile hard alloy cutter
The problem of preparation of near-net-shape, and then propose a kind of beneficial friction Fast Sintering molding side of larger ratio of height to diameter hard alloy cutter
Method；
A kind of larger ratio of height to diameter hard alloy cutter of the invention is mainly taken beneficial to friction Fast Sintering forming method
Technical solution:
A kind of sintering mold of larger ratio of height to diameter hard alloy 3-edge surgical knife tool, it is characterised in that: it include sintering mold punch-pin,
Sintering mold support base, three sintering mold segmental mandrels and high-strength graphite reinforcing sleeve, high-strength graphite reinforcing sleeve are equipped with infrared survey
Wen Kong, sintering mold punch-pin are cylindrical body, are equipped with a protrusion one, the cross section of protrusion one in the lower end surface of sintering mold punch-pin
Consistent with the hard alloy 3-edge surgical knife to be processed tool cross-sectional shape of blank, sintering mold support base is by big protruding block and small lugs group
At big protruding block is identical with small lugs central axis, big protruding block cross section and raised identical, the chamfered shape and big protruding block of small lugs
Unanimously, the lower section of sintering mold segmental mandrel be equipped with one with small lugs cooperate protrusion two, each sintering mold segmental mandrel it is upper
Portion is arranged in a recessed portion of sintering mold punch-pin, and the lower part setting of each sintering mold segmental mandrel is supported in sintering mold
In seat, and protrusion two cooperates with small lugs and is arranged, and high-strength graphite reinforcing sleeve is sleeved on outside three sintering mold segmental mandrels,
The type chamber of sintering mold support base and three sintering mold segmental mandrels composition is as sintering mold cavity plate.
Has thermal sintering integration system by a kind of larger ratio of height to diameter hard alloy 3-edge surgical knife that above-mentioned sintering mold provides
Preparation Method:
Step 1: according to hard alloy density and the volume of forming tool, corresponding hard is calculated by density formula and is closed
The weight of golden pre-alloyed powder, the quality for measuring hard alloy pre-alloyed powder will be more than the quality of forming tool；
Step 2: the hard alloy pre-alloyed powder of measurement is poured into and is made of three segmental mandrels and sintering mold support base
Type chamber in after, sintering mold punch-pin is placed among three sintering mold segmental mandrels, guarantee powder will not be from mold
Hard alloy pre-alloyed powder is compacted on the basis of outflow；
Step 3: the mold equipped with hard alloy pre-alloyed powder is put into high-strength in discharge plasma sintering vacuum drying oven
On graphite among cushion block and high-strength graphite lower cushion block, infrared radiation thermometer is opened, adjusts the height and sintering of high-strength graphite lower cushion block
The angle in mold infrared measurement of temperature hole allows infrared ray directly to measure sintering mold segmental mandrel by sintering mold infrared measurement of temperature hole
Real time temperature, then open hydraulic press, move down hydraulic press upper press head, make that top electrode, cushion block, sintering mold are convex on high-strength graphite
Mould, hard alloy pre-alloyed powder, sintering mold segmental mandrel, sintering mold support base, high-strength graphite lower cushion block and lower electrode are tight
It is close to be connected, but do not apply pressure；
Step 4: closing the door of discharge plasma sintering vacuum drying oven, opens mechanical pump, when vacuum degree in furnace is lower than 1Pa,
It closes resistance to regulate, opens the vacuum degree of ionization gauge measurement high vacuum state, open diffusion pump, vacuum degree in furnace is made to reach 5
×10-3Pa meets the requirement of discharge plasma sintering；
Step 5: opening infrared radiation thermometer, applies the pressure of 20MPa-40MPa to sintering mold punch-pin, and guarantees burning
Pressure is constant during knot；
Step 6: opening direct current pulse power source, adjusts current value, and the temperature to unfashioned hard alloy cutter blank reaches
To after 1000 DEG C -1500 DEG C, 2min-4min is kept the temperature, to guarantee that hard alloy pre-alloyed powder tentatively sinters block into, then
Even reduction current value closes power supply up to 0A；
Step 7: the temperature of mold to be sintered is cooled to room temperature, and successively closes vacuum diffusion pump and mechanical pump, is opened and is deflated
Valve keeps vacuum degree in furnace identical as atmospheric pressure, takes out sintering mold；
Step 8: sintering mold is inverted, and is reentered into cushion block on the high-strength graphite in discharge plasma sintering vacuum drying oven
Among high-strength graphite lower cushion block, infrared radiation thermometer is opened, adjusts the height and the infrared survey of sintering mold of high-strength graphite lower cushion block
The angle in warm hole allows infrared ray directly to measure the real-time temperature of sintering mold segmental mandrel by sintering mold infrared measurement of temperature hole
Degree, then opens hydraulic press, moves down hydraulic press upper press head, makes top electrode, cushion block, knot mold segmental mandrel, sintering on high-strength graphite
Mould support seat, hard alloy cutter pre-burning block, sintering mold punch-pin, high-strength graphite lower cushion block and lower electrode seal are connected,
But do not apply pressure；
Step 9: closing the door of discharge plasma sintering vacuum drying oven, opens mechanical pump, when vacuum degree in furnace is lower than 1Pa,
It closes resistance to regulate, opens the vacuum degree of ionization gauge measurement high vacuum state, open diffusion pump, vacuum degree in furnace is made to reach 5
×10-3Pa meets the requirement of discharge plasma sintering；
Step 10: opening infrared radiation thermometer, applies the pressure of 50MPa-150MPa to sintering mold punch-pin, and guarantees burning
Pressure is constant during knot；
Step 11: opening direct current pulse power source, adjusts current value, and the temperature to hard alloy cutter blank reaches 1200
After DEG C -1400 DEG C, 3-9min is kept the temperature, then uniformly reduces current value until 0A, and close power supply；
Step 12: the temperature of mold to be sintered is cooled to room temperature, and successively closes vacuum diffusion pump and mechanical pump, opening are put
Air valve keeps vacuum degree in furnace identical as atmospheric pressure, takes out sintering mold；
Step 13: hard alloy cutter blank is finished using the method for Wire EDM, then basis
Requirement polishing carbide tool surface.
Compared with the prior art, the invention has the following beneficial effects:
One, preparation method of the invention can directly sinter hard alloy prealloy powder firmly into Complex Mold
Matter alloy 3-edge surgical knife tool substantially shortens the process flow of hard alloy 3-edge surgical knife tool preparation；
Two, method material economy that preparation method of the invention is cut relative to traditional bar 40%, reduces hard
The production cost of alloy cutter；
Three, the entire sintering time of preparation method of the invention is only 8% or so of conventional thermocompression sintering, high temperature dwell time
It is only the 7% of conventional thermocompression sintering, reduces the production cycle of hard alloy cutter, improve production efficiency；
Four, preparation method of the invention can make to shape rear hard alloy 3-edge surgical knife tool hardness raising 80%, improve
The service performance of hard alloy 3-edge surgical knife tool.
Five, preparation method of the invention can reduce mold difficulty of processing, simultaneously by optimization sintering mold structure design
The beneficial friction for generating its movement greatly improves the consistency of cutter.
Detailed description of the invention
Fig. 1 is that hard alloy larger ratio of height to diameter complex profile 3-edge surgical knife has isometric mapping；
Fig. 2 is that hard alloy larger ratio of height to diameter complex profile 3-edge surgical knife has the signal of short route sinter molding integral preparation method
Figure；
Fig. 3 is complex profile sintering mold and hard alloy cutter relative positional relationship schematic diagram；
Fig. 4 is that sintering process mold inverts schematic diagram；
Fig. 5 is complex profile sintering mold punch-pin schematic diagram；
Fig. 6 is complex profile sintering mold segmental mandrel schematic diagram；
Fig. 7 is complex profile sintering mold support base schematic diagram；
Fig. 8 is the micro-organization chart of hard alloy cutter after sinter molding.
In figure: 1 hydraulic press upper press head, 2 top electrodes, 3 sintering mold punch-pin, 4 hard alloy cutter blanks, 5 sintering molds
Thermometer hole, 6 infrared radiation thermometers, 7 lower electrodes, 8 discharge plasma sintering vacuum drying ovens, cushion block, 10 high-strength graphites add on 9 high-strength graphites
Strong set, 11 sintering mold cavity plates, 12 high-strength graphite lower cushion blocks, 13 hydraulic press push-down heads, 14 sintering mold segmental mandrels and 15 sintering
Mould support seat.
Specific embodiment
Specific embodiment 1: being illustrated in combination with fig. 2, a kind of larger ratio of height to diameter hard alloy 3-edge surgical knife described in present embodiment
The sintering mold of tool includes sintering mold punch-pin 3, sintering mold support base 15, three sintering mold segmental mandrels 14 and high-strength graphites
Reinforcing sleeve 10, high-strength graphite reinforcing sleeve 10 are equipped with infrared measurement of temperature hole 5, and sintering mold punch-pin 3 is cylindrical body, convex in sintering mold
The lower end surface of mould 3 is equipped with a protrusion one, the cross section of the cross section of protrusion one and hard alloy 3-edge surgical knife to be processed tool blank
Shape is consistent, and sintering mold support base 15 is made of big protruding block and small lugs, and big protruding block is identical with small lugs central axis, big protruding block
Cross section is identical as protrusion one, and the chamfered shape of small lugs is consistent with big protruding block, and the lower section of sintering mold segmental mandrel 14 is equipped with one
The protrusion two of a cooperation with small lugs, the top of each sintering mold segmental mandrel 14 one that sintering mold punch-pin 3 is arranged in are recessed
In concave portion, the lower part of each sintering mold segmental mandrel 14 is arranged in sintering mold support base 15, and protrusion two and small lugs phase
Mutually be equipped with, high-strength graphite reinforcing sleeve 10 is sleeved on outside three sintering mold segmental mandrels 14, sintering mold support base 15 with
Cavity plate of the type chamber of three sintering mold segmental mandrels 14 composition as mold.
Specific embodiment 2: illustrating present embodiment, a kind of hard alloy described in present embodiment in conjunction with Fig. 1 to 7
The realization process of 3-edge surgical knife tool short route thermal sintering integral preparation method are as follows:
Step 1: according to hard alloy density and the volume of forming tool, corresponding hard is calculated by density formula and is closed
The weight of golden pre-alloyed powder, the quality for measuring hard alloy pre-alloyed powder will be more than the quality of forming tool；
Step 2: the hard alloy pre-alloyed powder of measurement is poured by three segmental mandrels 14 and sintering mold support base 15
After in the type chamber of composition, sintering mold punch-pin 3 is placed among three sintering mold segmental mandrels 14, is guaranteeing that powder will not be from
Hard alloy pre-alloyed powder is compacted on the basis of being flowed out in mold；
Step 3: the mold equipped with hard alloy pre-alloyed powder is put into the height in discharge plasma sintering vacuum drying oven 8
On strong graphite among cushion block 9 and high-strength graphite lower cushion block 12, infrared radiation thermometer 6 is opened, the height of high-strength graphite lower cushion block 12 is adjusted
The angle in degree and sintering mold infrared measurement of temperature hole 5 allows infrared ray to pass through the directly measurement sintering of sintering mold infrared measurement of temperature hole 5
The real time temperature of mold segmental mandrel 14, then opens hydraulic press, moves down hydraulic press upper press head 1, makes top electrode 2, on high-strength graphite
It is cushion block 9, sintering mold punch-pin 3, hard alloy pre-alloyed powder, sintering mold segmental mandrel 14, sintering mold support base 15, high-strength
Graphite lower cushion block 12 and lower electrode 7 are closely coupled；
Step 4: closing the door of discharge plasma sintering vacuum drying oven 8, opens mechanical pump, is lower than 1Pa to vacuum degree in furnace
When, it closes resistance and regulates, open the vacuum degree of ionization gauge measurement high vacuum state, open diffusion pump, reach vacuum degree in furnace
To 5 × 10-3Pa；
Step 5: opening infrared radiation thermometer 6, applies the pressure of 20MPa-40MPa to sintering mold punch-pin 3, and guarantees
Pressure is constant in sintering process；
Step 6: opening direct current pulse power source, adjusts current value, the temperature to unfashioned hard alloy cutter blank 4
After reaching 1000 DEG C -1500 DEG C, 3min-9min is kept the temperature, to guarantee that hard alloy pre-alloyed powder tentatively sinters block into, then
Uniformly reduce current value up to 0A, and closes power supply；
Step 7: the temperature of mold to be sintered is cooled to room temperature, and successively closes vacuum diffusion pump and mechanical pump, is opened and is deflated
Valve keeps vacuum degree in furnace identical as atmospheric pressure, takes out sintering mold；
Step 8: sintering mold is inverted, and is reentered into cushion block on the high-strength graphite in discharge plasma sintering vacuum drying oven 8
9 and high-strength graphite lower cushion block 12 among, open infrared radiation thermometer 6, adjust high-strength graphite lower cushion block 12 height and sintering mold
The angle in infrared measurement of temperature hole 5 allows infrared ray to pass through the directly measurement sintering mold segmental mandrel 14 of sintering mold infrared measurement of temperature hole 5
Real time temperature, then open hydraulic press, move down hydraulic press upper press head 1, make top electrode 2, cushion block 9, knot mold on high-strength graphite
Segmental mandrel 14, sintering mold support base 15, hard alloy cutter pre-burning block, sintering mold punch-pin 3, high-strength graphite lower cushion block 12
And lower electrode 7 is closely coupled, but does not apply pressure；
Step 9: closing the door of discharge plasma sintering vacuum drying oven 8, opens mechanical pump, is lower than 1Pa to vacuum degree in furnace
When, it closes resistance and regulates, open the vacuum degree of ionization gauge measurement high vacuum state, open diffusion pump, reach vacuum degree in furnace
To 5 × 10-3Pa meets the requirement of discharge plasma sintering；
Step 10: opening infrared radiation thermometer 6, applies the pressure of 50MPa-150MPa to sintering mold punch-pin 3, and guarantees
Pressure is constant in sintering process；
Step 11: opening direct current pulse power source, adjusts current value, and the temperature to hard alloy cutter blank 4 reaches
After 1200 DEG C -1400 DEG C, 3min-9min is kept the temperature, to guarantee that hard alloy pre-alloyed powder tentatively sinters block into, then uniformly
Reduce current value up to 0A, and closes power supply；
Step 12: the temperature of mold to be sintered is cooled to room temperature, and successively closes vacuum diffusion pump and mechanical pump, opening are put
Air valve keeps vacuum degree in furnace identical as atmospheric pressure, takes out sintering mold；
Step 13: hard alloy cutter blank 4 is finished using the method for Wire EDM, then basis
Requirement polishing carbide tool surface.
Specific embodiment 3: present embodiment is in the quality described in step 1 for measuring hard alloy pre-alloyed powder
It is the 120% of tool quality, other undisclosed technologies and step are identical with embodiment two.
It is arranged such it is possible to prevente effectively from causing in process because of the loss of hard alloy pre-alloyed powder final
The bad problem of the quality of finished product.
Specific embodiment 4: the pressure that sintering mold punch-pin 3 applies 30MPa of the present embodiment described in step 5
Power, other undisclosed technologies and step are identical with embodiment two.
Specific embodiment 5: temperature to hard alloy cutter blank 4 of the present embodiment described in step 6 reaches
To after 1050 DEG C, 3min is kept the temperature, other undisclosed technologies and step are identical with embodiment two.
Specific embodiment six, the pressure that sintering mold punch-pin 3 applies 60MPa of the present embodiment described in step 10
Power, other undisclosed technologies and step are identical with embodiment two.
Specific embodiment seven, temperature to hard alloy cutter blank 4 of the present embodiment described in step 11
After reaching 1350 DEG C, 6min is kept the temperature, other undisclosed technologies and step are identical with embodiment two.
Specific embodiment eight, the method for Wire EDM of the present embodiment described in step 13 is to sintering mould
Having the spark erosion equipment in being finished is slow wire feeding spark erosion equipment, and technologies and step and tool is not disclosed in other
Body embodiment two is identical.
In electrical discharge machining, slow wire feeding equipment is more careful compared to the processing of fast wire winding equipment, is added with slow wire feeding equipment
Work cutter, tool surface quality can be more preferable.
Embodiment
The present embodiment provides a kind of hard alloy 3-edge surgical knifes to have thermal sintering integral preparation method, specifically according to following
What step carried out:
Step 1: according to hard alloy density and the volume of forming tool, it is pre- that hard alloy is calculated by density formula
The weight of alloy powder is 25g, and the quality for measuring hard alloy pre-alloyed powder is 30g；
Step 2: the hard alloy pre-alloyed powder of measurement is poured by three segmental mandrels 14 and sintering mold support base 15
After in the type chamber of composition, sintering mold punch-pin 3 is placed among three sintering mold segmental mandrels 14, is guaranteeing that powder will not be from
Hard alloy pre-alloyed powder is compacted on the basis of being flowed out in mold；
Step 3: the mold equipped with hard alloy prealloy powder is put into high-strength in discharge plasma sintering vacuum drying oven 8
On graphite among cushion block 9 and high-strength graphite lower cushion block 12, infrared radiation thermometer 6 is opened, adjusts the height of high-strength graphite lower cushion block 12
And the angle in sintering mold infrared measurement of temperature hole 5, so that infrared ray is passed through the directly measurement sintering mould of sintering mold infrared measurement of temperature hole 5
Have the real time temperature of segmental mandrel 14, then open hydraulic press, move down hydraulic press upper press head 1, makes top electrode 2, pads on high-strength graphite
Block 9, sintering mold punch-pin 3, hard alloy pre-alloyed powder, sintering mold segmental mandrel 14, sintering mold support base 15, high-strength stone
Black lower cushion block 12 and lower electrode 7 are closely coupled, but do not apply pressure；
Step 4: closing the door of discharge plasma sintering vacuum drying oven 8, mechanical pump is opened, to vacuum degree in furnace in 0.9Pa
When, it closes resistance and regulates, open the vacuum degree of ionization gauge measurement high vacuum state, open diffusion pump and (need to preheat in advance
50min), vacuum degree in furnace is made to reach 5 × 10-3Pa meets the requirement of discharge plasma sintering；
Step 5: opening infrared radiation thermometer 6, applies the pressure of 30MPa to sintering mold punch-pin 3, and guarantees sintered
Pressure is constant in journey；
Step 6: opening direct current pulse power source, adjusts current value, the temperature to unfashioned hard alloy cutter blank 4
After reaching 1050 DEG C, 3min is kept the temperature, to guarantee that hard alloy pre-alloyed powder tentatively sinters block into, then uniformly reduces electric current
Value closes power supply up to 0A；
Step 7: the temperature of mold to be sintered is cooled to room temperature, and successively closes vacuum diffusion pump and mechanical pump, is opened and is deflated
Valve keeps vacuum degree in furnace identical as atmospheric pressure, takes out sintering mold；
Step 8: sintering mold is inverted, and is reentered into cushion block on the high-strength graphite in discharge plasma sintering vacuum drying oven 8
9 and high-strength graphite lower cushion block 12 among, open infrared radiation thermometer 6, adjust high-strength graphite lower cushion block 12 height and sintering mold
The angle in infrared measurement of temperature hole 5 allows infrared ray to pass through the directly measurement sintering mold segmental mandrel 14 of sintering mold infrared measurement of temperature hole 5
Real time temperature, then open hydraulic press, move down hydraulic press upper press head 1, make top electrode 2, cushion block 9, knot mold on high-strength graphite
Segmental mandrel 14, sintering mold support base 15, hard alloy cutter pre-burning block, sintering mold punch-pin 3, high-strength graphite lower cushion block 12
And lower electrode 7 is closely coupled, but does not apply pressure；
Step 9: closing the door of discharge plasma sintering vacuum drying oven 8, mechanical pump is opened, to vacuum degree in furnace in 0.9Pa
When, it closes resistance and regulates, open the vacuum degree of ionization gauge measurement high vacuum state, open diffusion pump and (need to preheat in advance
50min), vacuum degree in furnace is made to reach 5 × 10-3Pa meets the requirement of discharge plasma sintering；
Step 10: opening infrared radiation thermometer 6, applies the pressure of 80MPa to sintering mold punch-pin 3, and guarantees sintered
Pressure is constant in journey；
Step 11: opening direct current pulse power source, adjusts current value, and the temperature to hard alloy cutter blank 4 reaches
After 1350 DEG C, 6min is kept the temperature, to guarantee that hard alloy pre-alloyed powder tentatively sinters block into, it is straight then uniformly to reduce current value
To 0A, and close power supply；
Step 12: the temperature of mold to be sintered is cooled to room temperature, and successively closes vacuum diffusion pump and mechanical pump, opening are put
Air valve keeps vacuum degree in furnace identical as atmospheric pressure, takes out sintering mold；
Step 13: finishing hard alloy cutter blank 4 using the method for slow wire feeding Wire EDM, and
It polishes according to requirements afterwards carbide tool surface.
Hard alloy 3-edge surgical knife tool manufactured in the present embodiment, the high temperature dwell time of hard alloy raw material reduce 93%,
The integral sintered time reduces 92%, and the hardness of cutter improves 80%, can be adapted in required machining.
The present invention is disclosed as above with preferable case study on implementation, and however, it is not intended to limit the invention, any to be familiar with this profession
Technical staff, without departing from the scope of the present invention, when the structure and technology contents that can use the disclosure above are done
A little change or it is modified to the equivalence enforcement case of equivalent variations out, but it is all without departing from technical solution of the present invention
Hold, any simple modification, equivalent change and modification done according to the technical essence of the invention to the above case study on implementation still belong to
Technical solution of the present invention range.
Claims (8)
1. a kind of sintering mold of larger ratio of height to diameter hard alloy 3-edge surgical knife tool, it is characterised in that: it includes sintering mold punch-pin
(3), sintering mold support base (15), three sintering mold segmental mandrels (14) and high-strength graphite reinforcing sleeve (10), high-strength graphite adds
Strong set (10) is equipped with infrared measurement of temperature hole (5), and sintering mold punch-pin (3) is cylindrical body, in the lower end surface of sintering mold punch-pin (3)
Equipped with a protrusion one, the cross section of protrusion one is consistent with the hard alloy 3-edge surgical knife to be processed tool cross-sectional shape of blank, burns
Knot mould support seat (15) is made of big protruding block and small lugs, and big protruding block is identical with the central axis of small lugs, big protruding block cross section
One identical as protrusion, the chamfered shape of small lugs is consistent with big protruding block, the lower section of sintering mold segmental mandrel (14) be equipped with one and
The protrusion two of small lugs cooperation, be arranged in sintering mold punch-pin (3) one of the top of each sintering mold segmental mandrel (14) are recessed
In concave portion, the lower part of each sintering mold segmental mandrel (14) is arranged in sintering mold support base (15), and protrusion two with it is small convex
Block, which cooperates, to be arranged, and high-strength graphite reinforcing sleeve (10) is sleeved on three sintering mold segmental mandrels (14) outsides, sintering mold branch
The type chamber of seat (15) and three sintering mold segmental mandrels (14) composition is supportted as sintering mold cavity plate (11).
2. a kind of larger ratio of height to diameter hard alloy cutter using the sintering mold described in claim 1 is beneficial to friction Fast Sintering
Forming method, it is characterised in that:
Step 1: according to hard alloy density and the volume of forming tool, it is pre- that corresponding hard alloy is calculated by density formula
The weight of alloy powder, the quality for measuring hard alloy pre-alloyed powder will be more than the quality of forming tool；
Step 2: the hard alloy pre-alloyed powder of measurement is poured by three segmental mandrels (14) and sintering mold support base (15)
After in the type chamber of composition, sintering mold punch-pin (3) is placed among three sintering mold segmental mandrels (14), hard alloy is pre-
Alloy powder compacting；
Step 3: the mold equipped with hard alloy pre-alloyed powder is put into high-strength in discharge plasma sintering vacuum drying oven (8)
Cushion block (9) and high-strength graphite lower cushion block (12) are intermediate on graphite, open infrared radiation thermometer (6), adjust high-strength graphite lower cushion block
(12) angle of height and sintering mold infrared measurement of temperature hole (5), allows infrared ray to pass through sintering mold infrared measurement of temperature hole (5)
The real time temperature for directly measuring sintering mold segmental mandrel (14), then opens hydraulic press, moves down hydraulic press upper press head (1), make
Cushion block (9), sintering mold punch-pin (3), hard alloy pre-alloyed powder, sintering mold segmental mandrel on electrode (2), high-strength graphite
(14), sintering mold support base (15), high-strength graphite lower cushion block (12) and lower electrode (7) are closely coupled；
Step 4: closing the door of discharge plasma sintering vacuum drying oven (8), opens mechanical pump, when vacuum degree in furnace is lower than 1Pa,
It closes resistance to regulate, opens the vacuum degree of ionization gauge measurement high vacuum state, open diffusion pump, vacuum degree in furnace is made to reach 5
×10-3Pa；
Step 5: opening infrared radiation thermometer (6), and sintering mold punch-pin (3) are applied with the pressure of 20MPa-40MPa, and guarantees
Pressure is constant in sintering process；
Step 6: opening direct current pulse power source, adjusts current value, and the temperature to unfashioned hard alloy cutter blank (4) reaches
To after 1000 DEG C -1500 DEG C, 2min-4min is kept the temperature, to guarantee that hard alloy pre-alloyed powder tentatively sinters block into, then
Even reduction current value closes power supply up to 0A；
Step 7: the temperature of mold to be sintered is cooled to room temperature, and successively closes vacuum diffusion pump and mechanical pump, and opening vent valve makes
Vacuum degree is identical as atmospheric pressure in furnace, takes out sintering mold；
Step 8: sintering mold is inverted, and is reentered into cushion block on the high-strength graphite in discharge plasma sintering vacuum drying oven (8)
(9) and high-strength graphite lower cushion block (12) is intermediate, opens infrared radiation thermometer (6), adjust high-strength graphite lower cushion block (12) height and
The angle in sintering mold infrared measurement of temperature hole (5) allows infrared ray to pass through sintering mold infrared measurement of temperature hole (5) directly measurement sintering
The real time temperature of mold segmental mandrel (14), then opens hydraulic press, moves down hydraulic press upper press head (1), makes top electrode (2), high-strength
Cushion block (9), knot mold segmental mandrel (14), sintering mold support base (15), hard alloy cutter pre-burning block, sintering mould on graphite
It is closely coupled to have punch-pin (3), high-strength graphite lower cushion block (12) and lower electrode (7), but does not apply pressure；
Step 9: closing the door of discharge plasma sintering vacuum drying oven (8), opens mechanical pump, when vacuum degree in furnace is lower than 1Pa,
It closes resistance to regulate, opens the vacuum degree of ionization gauge measurement high vacuum state, open diffusion pump, vacuum degree in furnace is made to reach 5
×10-3Pa；
Step 10: opening infrared radiation thermometer (6), and sintering mold punch-pin (3) are applied with the pressure of 50MPa-150MPa, and guarantees
Pressure is constant in sintering process；
Step 11: opening direct current pulse power source, adjusts current value, and the temperature to hard alloy cutter blank (4) reaches 1200
After DEG C -1400 DEG C, 3min-9min is kept the temperature, then uniformly reduces current value until 0A, and close power supply；
Step 12: the temperature of mold to be sintered is cooled to room temperature, and successively closes vacuum diffusion pump and mechanical pump, opens vent valve
Keep vacuum degree in furnace identical as atmospheric pressure, takes out sintering mold；
Step 13: finishing hard alloy cutter blank (4) using the method for Wire EDM, and then basis makes
With require polishing carbide tool surface.
3. a kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter according to claim 2,
It is characterized by: the quality described in step 1 for measuring hard alloy pre-alloyed powder is the 120% of tool quality.
4. a kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter according to claim 3,
It is characterized by: described in step 5 sintering mold punch-pin (3) are applied with the pressure of 30MPa.
5. a kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter according to claim 4,
It is characterized by: keeping the temperature 3min described in step 6 after the temperature of hard alloy cutter blank (4) reaches 1050 DEG C.
6. a kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter according to claim 5,
It is characterized by: described in step 10 sintering mold punch-pin (3) are applied with the pressure of 80MPa.
7. a kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter according to claim 6,
It is characterized by: keeping the temperature 6min described in step 11 after the temperature of hard alloy cutter blank (4) reaches 1350 DEG C.
8. a kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter according to claim 7,
It is characterized by: the method for Wire EDM described in step 13 finishes hard alloy cutter blank (4)
In spark erosion equipment be slow wire feeding spark erosion equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910012915.7A CN109465449B (en) | 2019-01-07 | 2019-01-07 | Beneficial friction rapid sintering forming method for hard alloy cutter with large height-diameter ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910012915.7A CN109465449B (en) | 2019-01-07 | 2019-01-07 | Beneficial friction rapid sintering forming method for hard alloy cutter with large height-diameter ratio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109465449A true CN109465449A (en) | 2019-03-15 |
| CN109465449B CN109465449B (en) | 2020-06-09 |
Family
ID=65677245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910012915.7A Active CN109465449B (en) | 2019-01-07 | 2019-01-07 | Beneficial friction rapid sintering forming method for hard alloy cutter with large height-diameter ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109465449B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202571280U (en) * | 2012-04-12 | 2012-12-05 | 北京工业大学 | Mould for discharge plasma sintering equipment |
| CN103331444A (en) * | 2013-07-05 | 2013-10-02 | 益阳市新纪元粉末冶金有限公司 | Compression forming mold for sintered metal product, application thereof and forming mold release method |
| CN203972863U (en) * | 2014-07-03 | 2014-12-03 | 厦门理工学院 | A kind of sectional mould for discharge plasma sintering |
| CN106312067A (en) * | 2016-10-11 | 2017-01-11 | 河海大学 | Graphite die for pressureless spark plasma sintering |
| CN107498038A (en) * | 2017-08-09 | 2017-12-22 | 河海大学 | Multicarity pressureless sintering graphite jig |
| CN107716925A (en) * | 2017-09-27 | 2018-02-23 | 西北工业大学 | A kind of super-pressure anti-slip mould for discharge plasma sintering |
-
2019
- 2019-01-07 CN CN201910012915.7A patent/CN109465449B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202571280U (en) * | 2012-04-12 | 2012-12-05 | 北京工业大学 | Mould for discharge plasma sintering equipment |
| CN103331444A (en) * | 2013-07-05 | 2013-10-02 | 益阳市新纪元粉末冶金有限公司 | Compression forming mold for sintered metal product, application thereof and forming mold release method |
| CN203972863U (en) * | 2014-07-03 | 2014-12-03 | 厦门理工学院 | A kind of sectional mould for discharge plasma sintering |
| CN106312067A (en) * | 2016-10-11 | 2017-01-11 | 河海大学 | Graphite die for pressureless spark plasma sintering |
| CN107498038A (en) * | 2017-08-09 | 2017-12-22 | 河海大学 | Multicarity pressureless sintering graphite jig |
| CN107716925A (en) * | 2017-09-27 | 2018-02-23 | 西北工业大学 | A kind of super-pressure anti-slip mould for discharge plasma sintering |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109465449B (en) | 2020-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109663911A (en) | A kind of hard alloy 3-edge surgical knife tool thermal sintering integrated mould and preparation method | |
| CN106735186B (en) | A kind of method that 3D printing-isostatic cool pressing prepares titanium alloy multi-stage gear | |
| CN104846341B (en) | Isothermal extrusion production method of refractory metal rotating target material | |
| CN108558398A (en) | A kind of method of pulsed discharge room temperature flash sintering nano ceramic material | |
| CN102941343B (en) | Quick manufacturing method of titanium-aluminum alloy composite part | |
| CN111386164B (en) | High-hardness 3D printing steel product | |
| CN105777133B (en) | The preparation method and particular manufacturing craft of the whole shellproof plate of the more curved surfaces of disposal molding | |
| CN109550954A (en) | A kind of selective laser fusing manufacturing process of hot die steel | |
| CN106498205A (en) | A kind of manufacture method of the CuCr alloys of large scale high-compactness high uniformity | |
| CN105081330A (en) | Large-length-diameter-ratio ultrafine grain hard alloy step-shaped bar and preparation method | |
| CN105728708B (en) | A kind of production method of high density long-life tungsten-molybdenum alloy crucible | |
| CN104416157B (en) | The preparation method of titanium aluminum silicon alloy target | |
| CN108453243A (en) | A kind of ceramic-metal composites preparation method | |
| CN106216585A (en) | Integral hinge beam closed die forging molding die and hinge beam preparation method | |
| CN106312071A (en) | A tungsten-titanium tube target manufacture method | |
| CN106475566A (en) | The manufacture method of molybdenum titanium target base | |
| CA2512096A1 (en) | Method for producing reinforced platinum material | |
| CN108941412B (en) | GH4037 cake class part semisolid-solid union precision forging device and method | |
| CN109465449A (en) | A kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter | |
| CN106475567A (en) | The manufacture method of chrome molybdenum target blankss | |
| CN101786135B (en) | Mould for locking ring of wheel type construction mechanical wheel | |
| CN104532040A (en) | Cemented carbide composite molding method | |
| JPH09324202A (en) | Sintered die for forming and forming thereof | |
| CN101618414A (en) | Deposition manufacturing method of tools and moulds | |
| CN109049280B (en) | Production equipment and use method of spatial structure prefabricated body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |