CN109402332A - A kind of heat treatment process of aluminium alloy extrusion mould - Google Patents
A kind of heat treatment process of aluminium alloy extrusion mould Download PDFInfo
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- CN109402332A CN109402332A CN201811165906.3A CN201811165906A CN109402332A CN 109402332 A CN109402332 A CN 109402332A CN 201811165906 A CN201811165906 A CN 201811165906A CN 109402332 A CN109402332 A CN 109402332A
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- aluminium alloy
- alloy extrusion
- extrusion mould
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
- C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
- C23C8/68—Boronising
- C23C8/70—Boronising of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Extrusion Of Metal (AREA)
Abstract
The present invention relates to a kind of heat treatment process of aluminium alloy extrusion mould, it includes machining, boronising, quenching, tempering, cleaning and tufftride step: first being processed to aluminium alloy extrusion mould material；Then decontamination processing is carried out to aluminium alloy extrusion mould surface, aluminium alloy extrusion mould is placed in the rustless steel container of tool lid after decontamination processing, boronising powder is filled between the inside of rustless steel container and the outside of aluminium alloy extrusion mould, fire clay seals between the lid and ontology of rustless steel container, finally rustless steel container is put into furnace to be warming up at 900 DEG C and keeps the temperature 2-4 hours, it then cools to room temperature with the furnace, takes out mold；Then mold is heat-treated, vacuum hardening adds to be tempered three times, and then greasy dirt cleans；The aluminium alloy extrusion mould after cleaning is finally placed in progress tufftride processing in nitriding furnace；This process increases the performances such as the anti-melting-loss ability of aluminium alloy extrusion mould, block resistance.
Description
Technical field
The invention belongs to metal surface chemical treatment method fields, and in particular to a kind of heat treatment of aluminium alloy extrusion mould
Technique.
Background technique
With the fast development of society, the production scale of modern industry constantly expanding, increasingly to the demand of mold
Next more, the requirement of quality is also higher and higher.
Aluminium alloy extrusion mould during military service repeatedly with the alloy contact of the condition of high temperature, in periodic alternation heat
Under stress, the structure property on mold materials especially surface layer is gradually developed, and eventually leads to failure.Erosion is that aluminium closes
The critically important reason of golden extrusion die.In order to improve the service performance of mold, the service life of mold is improved, surface treatment skill is introduced
Art.
Process for treating surface is mainly by applying various coverings or being changed using the methods of machinery, physics, chemistry
Become material surface pattern, chemical component, phase composition, microstructure, defect state or stress state, so that improving material resists ring
The ability of border effect.Compared with the process of surface treatment such as nitriding, boronising, surface oxidation treatment is to aluminium alloy extrusion mould thermal cycle
The influence of stress variation in the process is smaller, and oxidation technology economical and effective, when being aoxidized to die surface, die size
Limitation is smaller, can significantly improve the aluminum-resistant Erosion Properties of aluminium alloy extrusion mould.Previous work is mostly in oxidizing atmosphere
Directly material is aoxidized down, makes one layer of its Surface Creation Fe3O4 film with protective effect, the oxidation process through
From all stages for being warming up to heat preservation, oxidation process has uncontrollability.
It makes known China et al. and has studied 5CrNiMo extrusion die steel in 440 DEG C ~ 680 DEG C ranges with static isothermal oxidation method
Interior high-temperature oxydation characteristic, research find 5CrNiMo extrusion die steel in 460 DEG C or less heating, and oxidation rate is lower；And
590 DEG C or more when heating, make oxidation rate increase severely, and have oxidation film cracking phenomena, but not to oxygen due to there is FeO
Influence of the concentration to 5CrNiMo extrusion die steel oxidation film is studied.
Min Yongan et al. improves the dynamic anti-melting-loss ability of H13 extrusion die steel with the method for vapor oxidation surface treatment
Can, but its static anti-melting-loss ability energy almost without raising.For low pressure (partial vacuum) oxidation is applied to extruding aluminium alloy mold
Research on tool is also seldom.
Summary of the invention
A kind of heat treatment process of aluminium alloy extrusion mould is provided the purpose of the present invention is overcome the deficiencies in the prior art, it should
Technique improves the performances such as the anti-melting-loss ability of aluminium alloy extrusion mould, block resistance.
In order to achieve the above object, the present invention adopts the following technical scheme:
The present invention provides a kind of heat treatment process of aluminium alloy extrusion mould, it includes machining, boronising, quenching, tempering, clearly
It washes and tufftride step:
(1) it processes: rough turn processing is carried out to aluminium alloy extrusion mould material, complete fabrication hole, pin hole, screw tap, bolt hole
Processing, obtains die blank；Then Tempering and Quenching is carried out to die blank；Then upper die and lower die assembly is carried out, seam allowance is completed
With the cooperation of positioning pin, finally tightened with fastening bolt；The processing of positioning reference holes, the surface in hole are carried out to the mold after cooperation
Roughness should be higher than that Ra0.8；Upper mould core is processed by the way of inlaying welding, and mold core core bar is added by the way of peripheral milling
Work, mold core core print are formed using linear cutter, and mold core is inserted into upper mold inlaid hole using argon arc welding after processing is completed in rear end
It is welded and fixed；Lower die die hole uses linear cutter, and the position of die hole is determined by positioning reference holes；
(2) boronising: carrying out nanosizing processing to aluminium alloy extrusion mould surface, and the mold sample after nanosizing is carried out surface and is gone
Dirt is handled, and after decontamination processing, aluminium alloy extrusion mould is placed in the rustless steel container of tool lid, the inside of rustless steel container and aluminium
It is filled with boronising powder between the outside of alloy extrusion mold, passes through between the lid of rustless steel container and the ontology of rustless steel container
Rustless steel container, is finally put into furnace to be warming up at 900 DEG C and keeps the temperature 2-4 hours, finally cool to room with the furnace by fire clay sealing
Temperature takes out aluminium alloy extrusion mould；
(3) quenching and tempering: aluminium alloy extrusion mould is heat-treated, and vacuum hardening adds to be tempered three times, its hardness is controlled
Within the scope of 43-53HRC；
(4) it cleans: aluminium alloy extrusion mould surface is cleaned, with dust, the greasy dirt of alcohol removal die surface；
(5) tufftride: the aluminium alloy extrusion mould after cleaning is placed in progress tufftride processing in nitriding furnace, tufftride handles work
Be passed through in skill gas be ammonia and carbon monoxide mixtures, gas soft nitriding processing parameter are as follows: temperature: 540-550 DEG C, the time:
6-7 hours；Then air inflow to the original one third, 7 for reducing ammonia as a child closed the air inlet of carbon monoxide, with
Furnace cooling；
(6) when the temperature of stove in step (5) be reduced to 150 DEG C hereinafter, finished product of coming out of the stove to obtain.
According to the heat treatment process of above-mentioned aluminium alloy extrusion mould, the boronizing paste is by following weight percent raw material
Be made: 2-5% boron carbide and 1-3% potassium fluoborate, surplus are silicon carbide.
According to the heat treatment process of above-mentioned aluminium alloy extrusion mould, the technological parameter of the vacuum hardening are as follows: (1) by aluminium
Alloy extrusion mold is warming up to 650~680 DEG C, 50~55min of heating-up time from room temperature, keeps the temperature 30~35min；(2) aluminium is closed
Golden extrusion die is warming up to 850~880 DEG C, 35~40min of heating-up time from 650~680 DEG C, keeps the temperature 20~25min；(3) will
Aluminium alloy extrusion mould is warming up to 1050~1080 DEG C, 35~40min of heating-up time from 850~880 DEG C, keeps the temperature 60~70min；
(4) heat preservation terminates, the inflated with nitrogen in vacuum air-quenching furnace burner hearth, and nitrogen pressure is 0.5~0.6MPa, opens simultaneously blower, blower
Revolving speed is 2900~3000 revs/min, and aluminium alloy extrusion mould is quickly cooled to 70 DEG C, is then come out of the stove.
According to the heat treatment process of above-mentioned aluminium alloy extrusion mould, the technique of the tempering: tempering temperature 560-590
DEG C, tempering insulation time is 80-90 minutes.
According to the heat treatment process of above-mentioned aluminium alloy extrusion mould, it is ammonia that gas is passed through in the soft nitriding processing technology
The volume ratio of gas and carbon monoxide mixtures, ammonia and carbon monoxide is 9:1.
Compared with prior art, the present invention obtain the utility model has the advantages that
Present invention process improves the stability of aluminium alloy extrusion mould surface smoothness, and the hardness of mold materials and toughness have
It is improved, and under the premise of guaranteeing toughness, the service life of mold is extended.
Specific embodiment
Lower embodiment is to carry out detailed specific description to the content of present invention, but the contents of the present invention do not limit so.
Embodiment:
The present invention provides a kind of heat treatment process of aluminium alloy extrusion mould, it includes machining, boronising, quenching, tempering, clearly
It washes and tufftride step:
(1) it processes: rough turn processing is carried out to aluminium alloy extrusion mould material, complete fabrication hole, pin hole, screw tap, bolt hole
Processing, obtains die blank；Then Tempering and Quenching is carried out to die blank；Then upper die and lower die assembly is carried out, seam allowance is completed
With the cooperation of positioning pin, finally tightened with fastening bolt；The processing of positioning reference holes, the surface in hole are carried out to the mold after cooperation
Roughness should be higher than that Ra0.8；Upper mould core is processed by the way of inlaying welding, and mold core core bar is added by the way of peripheral milling
Work, mold core core print are formed using linear cutter, and mold core is inserted into upper mold inlaid hole using argon arc welding after processing is completed in rear end
It is welded and fixed；Lower die die hole uses linear cutter, and the position of die hole is determined by positioning reference holes；
(2) boronising: carrying out nanosizing processing to aluminium alloy extrusion mould surface, and the mold sample after nanosizing is carried out surface and is gone
Dirt is handled, and after decontamination processing, aluminium alloy extrusion mould is placed in the rustless steel container of tool lid, the inside of rustless steel container and aluminium
It is filled with boronising powder between the outside of alloy extrusion mold, passes through between the lid of rustless steel container and the ontology of rustless steel container
Rustless steel container, is finally put into furnace to be warming up at 900 DEG C and keeps the temperature 2-4 hours, finally cool to room with the furnace by fire clay sealing
Temperature takes out aluminium alloy extrusion mould；The boronizing paste is made of following weight percent raw material: 2-5% boron carbide and 1-3% fluorine
Potassium borate, surplus are silicon carbide.
(3) quenching and tempering: aluminium alloy extrusion mould is heat-treated, and vacuum hardening adds to be tempered three times, by its hardness
Control is within the scope of 43-53HRC；
(4) it cleans: aluminium alloy extrusion mould surface is cleaned, with dust, the greasy dirt of alcohol removal die surface；
(5) tufftride: the aluminium alloy extrusion mould after cleaning is placed in progress tufftride processing in nitriding furnace, tufftride handles work
It is ammonia and carbon monoxide mixtures that gas is passed through in skill, and it is ammonia and an oxidation that gas is passed through in the soft nitriding processing technology
The volume ratio of carbon mix, ammonia and carbon monoxide is 9:1；Gas soft nitriding processing parameter are as follows: temperature: 540-550 DEG C, when
Between: 6-7 hours；Then reduce the air inflow of ammonia to original one third, 7 as a child closed carbon monoxide into
Gas cools down with furnace；
(6) when the temperature of stove in step (5) be reduced to 150 DEG C hereinafter, finished product of coming out of the stove to obtain.
According to the heat treatment process of above-mentioned aluminium alloy extrusion mould, according to the heat treatment of above-mentioned aluminium alloy extrusion mould
Technique, the technological parameter of the vacuum hardening are as follows: (1) aluminium alloy extrusion mould is warming up to 650~680 DEG C from room temperature, heating
50~55min of time keeps the temperature 30~35min；(2) aluminium alloy extrusion mould is warming up to 850~880 DEG C from 650~680 DEG C,
35~40min of heating-up time keeps the temperature 20~25min；(3) aluminium alloy extrusion mould is warming up to 1050 from 850~880 DEG C~
1080 DEG C, 35~40min of heating-up time, keep the temperature 60~70min；(4) heat preservation terminates, the inflated with nitrogen in vacuum air-quenching furnace burner hearth,
Nitrogen pressure is 0.5~0.6MPa, opens simultaneously blower, rotation speed of fan is 2900~3000 revs/min, by extruding aluminium alloy mold
Tool is quickly cooled to 70 DEG C, then comes out of the stove.
According to the heat treatment process of above-mentioned aluminium alloy extrusion mould, the technique of the tempering: tempering temperature 560-590
DEG C, tempering insulation time is 80-90 minutes.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of heat treatment process of aluminium alloy extrusion mould, it is characterised in that it include machining, boronising, quenching, tempering, clearly
It washes and tufftride step:
Processing: carrying out rough turn processing to aluminium alloy extrusion mould material, complete fabrication hole, pin hole, screw tap, bolt hole plus
Work obtains die blank；Then Tempering and Quenching is carried out to die blank；Then carry out upper die and lower die assembly, complete seam allowance and
The cooperation of positioning pin, is finally tightened with fastening bolt；The processing of positioning reference holes is carried out to the mold after cooperation, the surface in hole is thick
Rugosity should be higher than that Ra0.8；Upper mould core is processed by the way of inlaying welding, and mold core core bar is processed by the way of peripheral milling,
Mold core core print is formed using linear cutter, and mold core, which is inserted into after processing is completed in upper mold inlaid hole, to be welded using argon arc welding in rear end
It is fixed；Lower die die hole uses linear cutter, and the position of die hole is determined by positioning reference holes；
Boronising: carrying out nanosizing processing to aluminium alloy extrusion mould surface, and the mold sample after nanosizing is carried out surface decontamination
It handles, after decontamination processing, aluminium alloy extrusion mould is placed in the rustless steel container of tool lid, the inside of rustless steel container and aluminium close
Boronising powder is filled between the outside of golden extrusion die, by resistance between the lid of rustless steel container and the ontology of rustless steel container
Rustless steel container, is finally put into furnace to be warming up at 900 DEG C and keeps the temperature 2-4 hours, finally cool to room temperature with the furnace by chamotte sealing,
Take out aluminium alloy extrusion mould；
Quenching and tempering: aluminium alloy extrusion mould is heat-treated, and vacuum hardening adds to be tempered three times, and the control of its hardness is existed
Within the scope of 43-53HRC；
Cleaning: aluminium alloy extrusion mould surface is cleaned, with dust, the greasy dirt of alcohol removal die surface；
Tufftride: the aluminium alloy extrusion mould after cleaning is placed in progress tufftride processing, soft nitriding processing technology in nitriding furnace
In be passed through gas be ammonia and carbon monoxide mixtures, gas soft nitriding processing parameter are as follows: temperature: 540-550 DEG C, the time: 6-7
Hour；Then air inflow to the original one third, 7 for reducing ammonia as a child closed the air inlet of carbon monoxide, with furnace
Cooling；
When the temperature of stove in step (5) be reduced to 150 DEG C hereinafter, finished product of coming out of the stove to obtain.
2. the heat treatment process of aluminium alloy extrusion mould according to claim 1, it is characterised in that the boronizing paste by
Following weight percent raw material is made: 2-5% boron carbide and 1-3% potassium fluoborate, surplus are silicon carbide.
3. the heat treatment process of aluminium alloy extrusion mould according to claim 1, it is characterised in that the vacuum hardening
Technological parameter are as follows: (1) aluminium alloy extrusion mould is warming up to 650~680 DEG C, 50~55min of heating-up time from room temperature, heat preservation
30~35min；(2) aluminium alloy extrusion mould is warming up to 850~880 DEG C, 35~40min of heating-up time from 650~680 DEG C,
Keep the temperature 20~25min；(3) aluminium alloy extrusion mould is warming up to 1050~1080 DEG C from 850~880 DEG C, the heating-up time 35~
40min keeps the temperature 60~70min；(4) heat preservation terminates, the inflated with nitrogen toward vacuum air-quenching furnace burner hearth in, nitrogen pressure for 0.5~
0.6MPa opens simultaneously blower, and rotation speed of fan is 2900~3000 revs/min, and aluminium alloy extrusion mould is quickly cooled to 70
DEG C, then come out of the stove.
4. the heat treatment process of aluminium alloy extrusion mould according to claim 1, it is characterised in that the technique of the tempering:
Tempering temperature is 560-590 DEG C, and tempering insulation time is 80-90 minutes.
5. the heat treatment process of aluminium alloy extrusion mould according to claim 1, it is characterised in that: the tufftride processing
Gas is passed through in technique as ammonia and carbon monoxide mixtures, the volume ratio of ammonia and carbon monoxide is 9:1.
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| CN201811165906.3A CN109402332A (en) | 2018-10-08 | 2018-10-08 | A kind of heat treatment process of aluminium alloy extrusion mould |
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| CN201811165906.3A CN109402332A (en) | 2018-10-08 | 2018-10-08 | A kind of heat treatment process of aluminium alloy extrusion mould |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205580A (en) * | 2019-06-21 | 2019-09-06 | 宁波合力模具科技股份有限公司 | A kind of gas nitriding process of Automobile Plate hot-forming die |
| CN110280973A (en) * | 2019-04-11 | 2019-09-27 | 张玉燕 | A kind of hydraulic cylinder manufacture method |
| CN113564518A (en) * | 2021-07-02 | 2021-10-29 | 江苏大学 | Chemical heat treatment method for improving comprehensive mechanical property of H13 steel |
| CN114058809A (en) * | 2021-11-18 | 2022-02-18 | 辽宁五一八内燃机配件有限公司 | Heat treatment method for forging die |
| CN114921620A (en) * | 2022-05-24 | 2022-08-19 | 武汉联塑精密模具有限公司 | Processing technology of extrusion die |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110280973A (en) * | 2019-04-11 | 2019-09-27 | 张玉燕 | A kind of hydraulic cylinder manufacture method |
| CN110205580A (en) * | 2019-06-21 | 2019-09-06 | 宁波合力模具科技股份有限公司 | A kind of gas nitriding process of Automobile Plate hot-forming die |
| CN113564518A (en) * | 2021-07-02 | 2021-10-29 | 江苏大学 | Chemical heat treatment method for improving comprehensive mechanical property of H13 steel |
| CN113564518B (en) * | 2021-07-02 | 2023-08-22 | 江苏大学 | Chemical heat treatment method for improving comprehensive mechanical properties of H13 steel |
| CN114058809A (en) * | 2021-11-18 | 2022-02-18 | 辽宁五一八内燃机配件有限公司 | Heat treatment method for forging die |
| CN114921620A (en) * | 2022-05-24 | 2022-08-19 | 武汉联塑精密模具有限公司 | Processing technology of extrusion die |
| CN114921620B (en) * | 2022-05-24 | 2023-08-08 | 武汉联塑精密模具有限公司 | Processing technology of extrusion die |
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Application publication date: 20190301 |