CN104384450A - Method for implanting tungsten carbide in specific area of mould - Google Patents
Method for implanting tungsten carbide in specific area of mould Download PDFInfo
- Publication number
- CN104384450A CN104384450A CN201410725807.1A CN201410725807A CN104384450A CN 104384450 A CN104384450 A CN 104384450A CN 201410725807 A CN201410725807 A CN 201410725807A CN 104384450 A CN104384450 A CN 104384450A
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- tungsten carbide
- mould
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- resin
- specific region
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- 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
- B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a method for implanting tungsten carbide in a specific area of a mould. The method comprises the following steps: A. preparation of a prefabricated resin mould with uniformly distributed tungsten carbide; B. preparation of an integral evanescent mould with a specific area containing uniformly distributed tungsten carbide; C. preparation of a sand box: placing the evanescent mould into a steel box, carefully adding moulding sand into the steel box around the evanescent mould, and covering a layer of ethylene-vinyl acetate copolymer film which is 4-6mm thick on the upper surface of the steel box to ensure the airtightness of the sand box; D. mould casting and moulding: pouring molten metal into a mould cavity of the evanescent mould, wherein when mould resin is replaced with the molten metal and tungsten carbide particles are captured, the tungsten carbide particles are completely replaced without changing the original positions of the tungsten carbide particles in the mould resin, so as to obtain alloy casting having a specific area with enhanced performance. According to the method disclosed by the invention, a casting technology of the evanescent mould is improved to a certain degree, the tungsten carbide particles are dispersed in a specific part of the mould, especially the tungsten carbide particles are uniformly dispersed in the specific part, so that the alloy casting with excellent properties is prepared under the condition of low cost.
Description
Technical field
The present invention relates to Technology of EPC field, especially a kind of method implanting tungsten carbide in mould specific region.
Background technology
The high-abrasive material of high tenacity is widely used in all conglomeraties such as metallurgy, mine, building materials, in actual applications, workpiece needs to bear complicated wear working condition, wear surface should also will to withstand shocks the effect of load by taking up wear, this should have enough anti-cutting abrasion performances with regard to desirability wearing piece, whole workpiece is also wanted to have enough good toughness, and along with the difference of operating mode, also different requirements is had, so need the technology finding a kind of applicability stronger to address this problem for the distribution of high-abrasive material material.At present, the production of high-abrasive material roughly has following several method.
One is find special alloy, and before foundry goods is shaping, the ratio of deployed alloying element, obtain the alloy-steel casting of good wear performance through cast heat treatment, their feature is that workpiece strength is high, and consistent internal structure, is applicable to general operating mode.
Two is the technology adopting built-up welding, the method for the welding rod built-up welding of carbide alloy is attached to the top layer of equipment, forms certain thickness wearing layer, but this method expends larger man-hour, is only suitable for for some Large-Scale Equipment
Three is adopt casting infiltration, after evaporative pattern is made, the superhard material powder of implantation and a certain proportion of binding agent Homogeneous phase mixing will be needed, then the evaporative pattern surface of making is sticked to, in casting process, the powder of superhard material forms certain thickness composite bed at cast product surface layer, and the composite bed thickness of this foundry goods is generally little.
Tungsten carbide is a kind of compound be made up of tungsten and carbon.For black hexagonal, have metallic luster, hardness is close with diamond, is electricity, hot good conductor.Pure tungsten carbide is frangible, if mix the metals such as a small amount of titanium, cobalt, just can reduce fragility.The stable chemical nature of tungsten carbide, can be applied to CEMENTED CARBIDE PRODUCTION material.Technical thought of the present invention improves evaporative pattern technology for the deficiencies in the prior art, just tungsten-carbide powder is implanted among evaporative pattern while evaporative pattern is formed, then change the position of tungsten carbide according to specific needs, this method simple and flexible, applicability is strong.
In sum, to pulverize and other need in the production equipment of shock resistance, wear-resisting condition at mineral, the wearability of wear resistance castings, intensity, life-span be always core consider key element.The intensity of common alloy-steel casting is difficult to meet the demand of growing industrial production to its performance such as high impact-resistant, high abrasion.The adding materials such as tungsten carbide significantly can improve the performance of alloy-steel casting, but prices are rather stiff for it.On the other hand, generally alloy-steel casting all can not need to provide impact resistance/anti-wear performance in all positions, under the impact only having a part for foundry goods to expose for a long time in most application and the condition of work of wearing and tearing, like this, a kind of that develop maturation, the practical method implanting tungsten carbide in mould specific region just seems particularly necessary.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method implanting tungsten carbide in mould specific region, certain improvement is carried out to lost foam casting process, tungsten carbide particle is dispersed in mould privileged site, especially ensure that tungsten carbide particle is dispersed in above-mentioned privileged site, thus preparation has the alloy-steel casting of premium properties under low cost condition.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows.
Implant the method for tungsten carbide in mould specific region, the method comprises the steps:
A, there is the preparation of the equally distributed prefabricated resin mould of tungsten carbide: resin particle and tungsten carbide particle mix and join in steel mold cavity, punching block mould on the vibrating random high speed vibration to make, resin particle and tungsten-carbide powder are evenly random is full of whole die cavity, and then pass into steam foaming, shaping rear tungsten carbide particle is dispersed in the middle of prefabricated resin mould; The diameter of tungsten carbide particle is controlled between 1-8mm in this step;
B, contain the preparation of the overall evaporative pattern of equally distributed tungsten carbide in specific region: the prefabricated grinding tool of given shape steps A prepared combines or is implanted to the specific region of overall evaporative pattern, described specific region comprise the full surface of any thickness, the discrete surface block of arbitrary shape, the inside of mould and other need the region of special strengthening; After correct implantation, evaporative pattern dips fireproof coating, and described fireproof coating has the feature of low-permeable and superior absorbent resin liquid or gas, parches completely after coating is painted with, and dry complete paint thickness controls at 0.1-0.25mm;
The preparation of C, sandbox: the evaporative pattern prepared for step B arranges cast gate, and gate valve, rising head are set as required, then be placed in steel case, careful being joined in steel case by molding sand is centered around around evaporative pattern, and what make molding sand consolidation by vibrations immediately is layered on the surface of lost foam pattern; After vibrations, the density domination of molding sand is being not less than 99 pounds every cubic chi; Then ethylene-vinyl acetate copolymer film thick for one deck 4-6mm is covered the upper surface of sandbox to ensure the seal of sandbox, and connect at least one flexible pipe cast molten steel time vacuumize, so that the evaporative pattern gas of gasification is removed to outside sandbox;
D, die casting are shaping: after the various process parameters of accurate rate-determining steps A-C, can directly be poured into by molten metal liquid in evaporative pattern mold chamber prepared by step C; Notice in this step that the diameter examining tungsten carbide particle in steps A is between 1-8mm, particle diameter too conference loses impact resistance, particle diameter is little can produce tungsten carbide gather with unsceptered and lose wearability; Replace resin mould when catching tungsten carbide particle at motlten metal like this, tungsten carbide particle is fully substituted and can not changes its position originally in the middle of resin die, the alloy-steel casting of obtained specific region performance enhancement.
As a preferred technical solution of the present invention, in steps A, controlling the diameter of tungsten carbide particle between 3-6mm fully foams with resin particle, to hold concurrently wearability effect to reach optimum impact resistance, and when making deposite metal to replace resin evaporative pattern, tungsten carbide can not be unsceptered simultaneously.
As a preferred technical solution of the present invention, in steps A, the ratio of described resin particle and tungsten carbide particle is associated with the purposes of foundry goods, and the volume controlling tungsten carbide particle accounts for the 5%-50% of punching block volume; Described resin particle is polystyrene resin beads.
As a preferred technical solution of the present invention, in step B, described fireproof coating adopts alumina silica-water base slurry coating material, and the solid constituent controlling this fireproof coating by weight accounts for 48-52%.
As a preferred technical solution of the present invention, in step B, after fireproof coating coating in drying oven 50-60 degree condition under dry 10-14 little of parching completely.
As a preferred technical solution of the present invention, in step C, adopt AFS molding sand, controlling its particle mean size is 34-38 order or 90-100 order, and permeability is 450-525 μm
2or 63-67 μm
2.
As a preferred technical solution of the present invention, in step D, the vacuum degree control in casting process: for stainless cast steel part vacuum degree control at 20-29 inches of mercury, for other alloys as manganese steel, vacuum degree control is being less than 10 inches of mercury.
As a preferred technical solution of the present invention, in step D, the temperature in casting process controls: stainless pouring temperature is 1350-1450 degree, and the pouring temperature of other alloys as manganese steel is more than 1450 degree.
The beneficial effect adopting technique scheme to produce is: the strength demand of cost and foundry goods that the present invention has considered tungsten carbide is always embodied in this feature of ad-hoc location, obtains the alloy-steel casting with good wear performance under cost-saving prerequisite.In pilot production, for the specific position of some foundry goods, the content of tungsten carbide particle can be brought up to more than 50%, there is obvious technological merit.
Core innovative point of the present invention is to develop complete set and ripe process route, not only makes tungsten carbide material concentrate on foundry goods any specific region, especially guarantee tungsten carbide particle full and uniform be dispersed in above-mentioned specific region.Applicant studies and finds in actual production operation, and the granule size of tungsten carbide must meet specific standard.Tungsten carbide has been verified has the performances such as wear-resistant in numerous applications, but due to price high and limit its application; Drop out from pedestal if the diameter of tungsten carbide particle, more than 8mm, embrittlement will occur, if instead its particle diameter is too little of just easily there is precipitation aggregation phenomenon lower than during 1mm, the problem improving melting cast properties is fallen effect or lost efficacy.First prepare the equally distributed prefabricated resin mould of tungsten carbide in processing step of the present invention, to mix full and uniform to tungsten carbide particle and resin particle and steam foams.After above-mentioned integrated treatment, when motlten metal replaces resin evaporative pattern, test has proved that tungsten carbide particle is fully substituted and can not changes its position originally in the middle of resin die, finally make tungsten carbide material concentrate on foundry goods any specific region, and tungsten carbide particle is full and uniform dispersion in above-mentioned specific region.
The present invention is applicable to the tungsten carbide particle of various ways, such as single tungsten carbide, and it belongs to complete carburetting compound, has single-phase microstructure, and non-fusible in process, parent metal is embrittlement not easily; Also be applicable to merge tungsten carbide, especially when foundry goods needs shock resistance.
Accompanying drawing explanation
Fig. 1 is the schematic diagram after tungsten carbide is implanted in mould specific region, in figure, and the part of black part representative containing tungsten carbide particle.
Detailed description of the invention
Following examples describe the present invention in detail.Various raw material used in the present invention and items of equipment are conventional commercial product, all can be bought by market and directly obtain.
Embodiment 1
Implant the method for tungsten carbide in mould specific region, comprise the steps:
A, there is the preparation of the equally distributed prefabricated resin mould of tungsten carbide: polystyrene resin beads and tungsten carbide particle mix and join in steel mold cavity, punching block mould on the vibrating random high speed vibration to make, resin particle and tungsten-carbide powder are evenly random is full of whole die cavity, controlling the diameter of tungsten carbide particle between 3-6mm fully foams with resin particle, to hold concurrently wearability effect to reach optimum impact resistance, make simultaneously deposite metal replace resin evaporative pattern time tungsten carbide can not be unsceptered, ensure that tungsten carbide particle is dispersed in the specific region of mould uniformly, for the size of tungsten carbide particle, usually do not bear the condition of greater impact power at foundry goods under, the diameter of tungsten carbide can suitably increase (can increase to 12mm under extreme case), otherwise should reduce its particle diameter, in addition, in this step, the ratio of resin particle and tungsten carbide particle is associated with the purposes of foundry goods, and the wearability of foundry goods requires higher, then need more a large amount of tungsten carbide constituent, and the volume usually controlling tungsten carbide particle accounts for the 10%-40% of punching block volume,
B, contain the preparation of the overall evaporative pattern of equally distributed tungsten carbide in specific region: the prefabricated grinding tool of given shape steps A prepared combines or is implanted to the specific region of overall evaporative pattern, described specific region comprise the full surface of any thickness, the discrete surface block of arbitrary shape, the inside of mould and other need the region of special strengthening; After correct implantation, evaporative pattern dips fireproof coating, described fireproof coating has the feature of low-permeable and superior absorbent resin liquid or gas, alumina silica-water base slurry coating material can be adopted, the solid constituent controlling this fireproof coating by weight accounts for 50%, dry 12 little of parching completely under the condition of 55 degree in drying oven after coating is painted with, dry complete paint thickness controls at 0.2mm;
The preparation of C, sandbox: the evaporative pattern prepared for step B arranges cast gate, and gate valve, rising head are set as required, then be placed in steel case, careful being joined in steel case by molding sand is centered around around evaporative pattern, and what make molding sand consolidation by vibrations immediately is layered on the surface of lost foam pattern; After vibrations, the density domination of molding sand is being not less than 99 pounds every cubic chi, in actual production, can adopt AFS molding sand, controls that its particle mean size is 36 orders, permeability is 500 μm
2(or 95 orders, 65 μm
2); Then ethylene-vinyl acetate copolymer film thick for one deck 5mm is covered the upper surface of sandbox to ensure the seal of sandbox, and connect at least one flexible pipe cast molten steel time vacuumize, so that the evaporative pattern gas of gasification is removed to outside sandbox;
D, die casting are shaping: after the various process parameters of accurate rate-determining steps A-C, can directly be poured into by molten metal liquid in evaporative pattern mold chamber prepared by step C; Vacuum degree control in casting process: for stainless cast steel part vacuum degree control at 25 inches of mercury, for other alloys as manganese steel, vacuum degree control is being less than 10 inches of mercury; Temperature controls: stainless pouring temperature is 1400 degree, and the pouring temperature of other alloys as manganese steel is more than 1450 degree; Notice in this step that the diameter examining tungsten carbide particle in steps A is between 3-6mm, particle diameter too conference loses impact resistance, particle diameter is little can produce tungsten carbide gather with unsceptered and lose wearability; Replace resin mould when catching tungsten carbide particle at motlten metal like this, tungsten carbide particle is fully substituted and can not changes its position originally in the middle of resin die, the alloy-steel casting of obtained specific region performance enhancement.
Embodiment 2
The difference of the present embodiment and embodiment 1 is that steps A and B prepare the method for evaporative pattern, can be bonded on adhesive tape by tungsten carbide particle, after then original model being cut away part, will be stained with the adhesive tape of tungsten carbide particle on model; In addition for the situation only needing list processing, also tungsten carbide particle can be heated to about 175 degree, then it is placed on the platform of steel, by certain of the evaporative pattern made while be pressed onto on these particles, make it resin melting and slight for a part be dissolved in the middle of block mold by the fuel factor of powder.
Foregoing description only proposes, not as the single restrictive condition to its technical scheme itself as the enforceable technical scheme of the present invention.
Claims (8)
1. implant the method for tungsten carbide in mould specific region, it is characterized in that: the method comprises the steps:
A, there is the preparation of the equally distributed prefabricated resin mould of tungsten carbide: resin particle and tungsten carbide particle mix and join in steel mold cavity, punching block mould on the vibrating random high speed vibration to make, resin particle and tungsten-carbide powder are evenly random is full of whole die cavity, and then pass into steam foaming, shaping rear tungsten carbide particle is dispersed in the middle of prefabricated resin mould; The diameter of tungsten carbide particle is controlled between 1-8mm in this step;
B, contain the preparation of the overall evaporative pattern of equally distributed tungsten carbide in specific region: the prefabricated grinding tool of given shape steps A prepared combines or is implanted to the specific region of overall evaporative pattern, described specific region comprise the full surface of any thickness, the discrete surface block of arbitrary shape, the inside of mould and other need the region of special strengthening; After correct implantation, evaporative pattern dips fireproof coating, and described fireproof coating has the feature of low-permeable and superior absorbent resin liquid or gas, parches completely after coating is painted with, and dry complete paint thickness controls at 0.1-0.25mm;
The preparation of C, sandbox: the evaporative pattern prepared for step B arranges cast gate, and gate valve, rising head are set as required, then be placed in steel case, careful being joined in steel case by molding sand is centered around around evaporative pattern, and what make molding sand consolidation by vibrations immediately is layered on the surface of lost foam pattern; After vibrations, the density domination of molding sand is being not less than 99 pounds every cubic chi; Then ethylene-vinyl acetate copolymer film thick for one deck 4-6mm is covered the upper surface of sandbox to ensure the seal of sandbox, and connect at least one flexible pipe cast molten steel time vacuumize, so that the evaporative pattern gas of gasification is removed to outside sandbox;
D, die casting are shaping: after the various process parameters of accurate rate-determining steps A-C, can directly be poured into by molten metal liquid in evaporative pattern mold chamber prepared by step C; Notice in this step that the diameter examining tungsten carbide particle in steps A is between 1-8mm, particle diameter too conference loses impact resistance, particle diameter is little can produce tungsten carbide gather with unsceptered and lose wearability; Replace resin mould when catching tungsten carbide particle at motlten metal like this, tungsten carbide particle is fully substituted and can not changes its position originally in the middle of resin die, the alloy-steel casting of obtained specific region performance enhancement.
2. the method implanting tungsten carbide in mould specific region according to claim 1, it is characterized in that: in steps A, controlling the diameter of tungsten carbide particle between 3-6mm fully foams with resin particle, to hold concurrently wearability effect to reach optimum impact resistance, when making deposite metal replace resin evaporative pattern, tungsten carbide can not be unsceptered simultaneously.
3. the method implanting tungsten carbide in mould specific region according to claim 1, it is characterized in that: in steps A, the ratio of described resin particle and tungsten carbide particle is associated with the purposes of foundry goods, and the volume controlling tungsten carbide particle accounts for the 5%-50% of punching block volume; Described resin particle is polystyrene resin beads.
4. the method implanting tungsten carbide in mould specific region according to claim 1, it is characterized in that: in step B, described fireproof coating adopts alumina silica-water base slurry coating material, and the solid constituent controlling this fireproof coating by weight accounts for 48-52%.
5. according to claim 1ly implant the method for tungsten carbide in mould specific region, it is characterized in that: in step B, after fireproof coating coating in drying oven 50-60 degree condition under dry 10-14 little of parching completely.
6. the method implanting tungsten carbide in mould specific region according to claim 1, is characterized in that: in step C, and adopt AFS molding sand, controlling its particle mean size is 34-38 order or 90-100 order, and permeability is 450-525 μm
2or 63-67 μm
2.
7. the method implanting tungsten carbide in mould specific region according to claim 1, it is characterized in that: in step D, vacuum degree control in casting process: for stainless cast steel part vacuum degree control at 20-29 inches of mercury, for other alloys as manganese steel, vacuum degree control is being less than 10 inches of mercury.
8. the method implanting tungsten carbide in mould specific region according to claim 1, it is characterized in that: in step D, temperature in casting process controls: stainless pouring temperature is 1350-1450 degree, and the pouring temperature of other alloys as manganese steel is more than 1450 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410725807.1A CN104384450A (en) | 2014-12-03 | 2014-12-03 | Method for implanting tungsten carbide in specific area of mould |
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|---|---|---|---|
| CN201410725807.1A CN104384450A (en) | 2014-12-03 | 2014-12-03 | Method for implanting tungsten carbide in specific area of mould |
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| CN104384450A true CN104384450A (en) | 2015-03-04 |
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|---|---|---|---|
| CN201410725807.1A Pending CN104384450A (en) | 2014-12-03 | 2014-12-03 | Method for implanting tungsten carbide in specific area of mould |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110000335A (en) * | 2019-05-13 | 2019-07-12 | 河北科技大学 | A kind of casting method of impeller |
| CN110202091A (en) * | 2019-07-08 | 2019-09-06 | 河北科技大学 | A kind of tungsten carbide particle enhances the preparation method of whole iron base composite material |
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| JPS60261657A (en) * | 1984-06-08 | 1985-12-24 | Komatsu Ltd | Centrifugal casting method |
| CN1748912A (en) * | 2005-10-13 | 2006-03-22 | 西安交通大学 | Composite material tup and its casting method |
| CN102294434A (en) * | 2011-08-05 | 2011-12-28 | 谌征 | Composite molding casting process |
| CN102489686A (en) * | 2011-12-28 | 2012-06-13 | 昆明理工大学 | Method for preparing ceramic particle enhanced steel-base composite material cast by evaporative pattern casting die |
| CN102974762A (en) * | 2012-12-24 | 2013-03-20 | 昌图县吉派机械铸造有限责任公司 | Vacuum evanescent die casting process |
-
2014
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60261657A (en) * | 1984-06-08 | 1985-12-24 | Komatsu Ltd | Centrifugal casting method |
| CN1748912A (en) * | 2005-10-13 | 2006-03-22 | 西安交通大学 | Composite material tup and its casting method |
| CN102294434A (en) * | 2011-08-05 | 2011-12-28 | 谌征 | Composite molding casting process |
| CN102489686A (en) * | 2011-12-28 | 2012-06-13 | 昆明理工大学 | Method for preparing ceramic particle enhanced steel-base composite material cast by evaporative pattern casting die |
| CN102974762A (en) * | 2012-12-24 | 2013-03-20 | 昌图县吉派机械铸造有限责任公司 | Vacuum evanescent die casting process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110000335A (en) * | 2019-05-13 | 2019-07-12 | 河北科技大学 | A kind of casting method of impeller |
| CN110202091A (en) * | 2019-07-08 | 2019-09-06 | 河北科技大学 | A kind of tungsten carbide particle enhances the preparation method of whole iron base composite material |
| CN110202091B (en) * | 2019-07-08 | 2021-06-01 | 河北科技大学 | Preparation method of tungsten carbide particle reinforced integral iron-based composite material |
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