CN111893416B - Cold stamping die surface laser spraying treatment method - Google Patents
Cold stamping die surface laser spraying treatment method Download PDFInfo
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- CN111893416B CN111893416B CN202010788279.XA CN202010788279A CN111893416B CN 111893416 B CN111893416 B CN 111893416B CN 202010788279 A CN202010788279 A CN 202010788279A CN 111893416 B CN111893416 B CN 111893416B
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- 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
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/123—Spraying molten metal
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Electrochemistry (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention relates to the technical field of die processing, and discloses a laser spraying treatment method for the surface of a cold stamping die, which changes the form, chemical components, organizational structure and stress state of the surface of the die by surface coating and surface modification composite treatment technology to improve the service quality and service life of the die.
Description
Technical Field
The invention belongs to the technical field of die processing, and particularly relates to a cold stamping die surface laser spraying treatment method.
Background
The stamping die is a special process equipment for processing materials (metal or nonmetal) into parts (or semi-finished products) in cold stamping, and is called cold stamping die (commonly called cold stamping die). Stamping is a press working method in which a die mounted on a press is used to apply pressure to a material at room temperature to cause separation or plastic deformation of the material, thereby obtaining a desired part. In the stamping die, various metallic materials and non-metallic materials are used, mainly including carbon steel, alloy steel, cast iron, cast steel, cemented carbide, low melting point alloy, zinc-based alloy, aluminum bronze, synthetic resin, urethane rubber, plastic, laminated birch board, and the like. The material for manufacturing the die is required to have high hardness, high strength, high wear resistance, appropriate toughness, high hardenability, no deformation (or little deformation) during heat treatment, no cracking during quenching, and the like. In modern industry, a mold is an important condition for industrial development, production of a product depends on mold processing in many times, mold quality affects quality, efficiency and life of the product, the quality of the mold is related to the manufacturing quality of the product and other early use processes, and subsequent work in maintenance and other aspects is also affected.
In production application, the surface performance requirements of a cold stamping die are diversified, so that a single metal coating cannot meet the quality requirements, the thermal spraying technology is developed at the same time, the thermal spraying can be roughly divided into flame spraying, electric arc spraying, plasma spraying and laser spraying, and the plasma spraying and the high-speed flame spraying are mainly used in the production application, but the surface repairing function is not good.
Disclosure of Invention
The invention aims to solve the existing problems and provides a cold stamping die surface laser spraying treatment method, which utilizes laser spraying to spray a metal ceramic coating on a die to strengthen the surface of the die, can improve the properties of hardness, adhesion resistance, impact resistance, wear resistance, cold and hot fatigue resistance and the like, and has strong repairing effect.
The invention is realized by the following technical scheme:
a cold stamping die surface laser spraying treatment method specifically comprises the following process steps:
on the basis of chromium plating on the surface of a mould, spraying a metal ceramic coating on the mould by utilizing laser spraying, wherein the metal phase accounts for 40-50% of the metal ceramic coating, the ceramic phase accounts for 30-40% of the metal ceramic coating, and the balance is adhesive, and the method comprises the following steps:
(1) firstly, performing chrome plating on a cold stamping die to form a plating layer with the thickness of 1.0-1.5 microns on the surface, performing heat treatment after washing, performing high-temperature quenching at the temperature of 500-540 ℃, performing high-temperature tempering for 2 times at the temperature of 400-450 ℃, preserving heat for 3-4 hours, finally cooling to the temperature of 120-130 ℃ with cold water, controlling the cooling speed to be 13-15 ℃/min, and naturally cooling to room temperature;
(2) grinding metal phase components into powder of 20-30 meshes, putting the powder and ceramic powder into a glass mortar, grinding and crushing the powder to 50-60 meshes, adding an adhesive, uniformly stirring the components, performing pressure sintering at 5.3-5.6MPa and 650-670 ℃ for 2-3 hours, presetting the mixture on the surface of a mold after heat treatment and cooling, preheating the mixture at 200-220 ℃, performing laser spraying processing, wherein the laser output power is 900-1000W, the scanning speed is 12-14 mm/s under the protection of argon gas, immediately removing laser after a coating is melted, cooling, solidifying and polishing to be smooth.
Before chrome plating, the stamping die is cleaned, degreased and polished, a direct current electroplating process is adopted, the current density is 30-32A/dm2, and the concentration of the components of the plating solution is as follows: 230g of CrO 3-L, H2SO4, 2.5-2.6g/L, Cr3+:2.0-2.2g/L, Fe3+:0.8-1.0g/L, and the electroplating temperature is 53-55 ℃.
Further, the binder is obtained by mixing a sodium silicate aqueous solution with the mass concentration of 2.7-3.0% and lithium silicate with the mass concentration of 0.6-1.0% according to the mass ratio of 7-8: 1-2.
The cold stamping die aims at high-temperature-resistant metal materials.
As a further description of the above scheme, the metal phase contains the following components in percentage by mass: 20-25% of Zr, 8-10% of Zn, 5-7% of Al, 2.0-3.0% of V, 0.1-0.2% of Be, 0.02-0.04% of Sn and the balance of Mn.
As a further description of the above scheme, the ceramic phase comprises the following components in percentage by mass: MgCr 2 O 4 30-40% of ZnCr 2 O 4 20-30% of TiO 2 10-15% of ZrO 2 5-10% of the total weight of the SiC powder.
Compared with the prior art, the invention has the following advantages: in order to solve the problems of single surface treatment method and general strength of the existing cold stamping die, the invention provides a cold stamping die surface laser spraying treatment method, which changes the shape, chemical components, organization structure and stress state of the die surface by surface coating and surface modification composite treatment technology to improve the service quality and service life of the die, utilizes laser spraying and uses metal ceramic materials, the coating material has the characteristics of high reliability, good consistency and high response speed, the metal ceramic coating is sprayed on the die to strengthen the surface of the die, the hardness, the adhesion resistance, the impact resistance, the wear resistance, the cold and hot fatigue resistance and other properties of the die can be improved, the repair function is extremely strong, the deformation resistance toughness and the high compressive strength are extremely good, the cold stamping die is effectively improved, and the service life under the high-frequency service is prolonged, not only reduces resource consumption, but also saves enterprise cost, has wide application prospect, and lays a foundation for the research of novel wear-resistant and impact-resistant materials.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described with reference to specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the present invention and are not used for limiting the technical solutions provided by the present invention.
Example 1
A cold stamping die surface laser spraying processing method, on the basis of the chrome plating of the die surface, utilize laser spraying, spray the metal ceramic coating on the die, the metal phase accounts for 40% in the metal ceramic coating, the ceramic phase accounts for 30%, the remainder is the adhesive, including the following steps:
s1: firstly, carrying out chrome plating on a cold stamping die to form a plating layer with the thickness of 1.0 micron on the surface, washing with water, carrying out heat treatment, carrying out high-temperature quenching at the high-temperature quenching temperature of 500 ℃, carrying out high-temperature tempering for 2 times, carrying out heat preservation at the tempering temperature of 400 ℃ for 3 hours, finally cooling to 120 ℃ with cold water, controlling the cooling speed at 13 ℃/min, and then naturally cooling to room temperature;
s2: grinding metal phase components into powder of 20 meshes, putting the powder and ceramic powder into a glass mortar, grinding and crushing the powder to 50 meshes, adding a binder, uniformly stirring the components, performing pressure sintering at 5.3MPa and 650 ℃ for 2 hours, presetting the powder on the surface of a mold after heat treatment and cooling, wherein the thickness of a preset layer is 50 microns, preheating the powder at 200 ℃, performing laser spraying processing, ensuring the laser output power to be 900W, scanning speed to be 12 mm/s under the protection of argon, immediately removing laser after a coating is melted, cooling, solidifying and polishing the coating to be smooth.
Preferably, the stamping die is cleaned, degreased and polished before chrome plating, a direct current electroplating process is adopted, the current density is 30A/dm2, and the concentration of the components of the plating solution is as follows: 230g/L, H2SO4 of CrO3, 2.5g/L, Cr3+:2.0g/L, Fe3+:0.8g/L, and the electroplating temperature is 53 ℃.
Further, the binder is obtained by mixing a sodium silicate aqueous solution with a mass concentration of 2.7% and lithium silicate with a mass concentration of 0.6% according to a mass ratio of 7: 1.
The cold stamping die aims at high-temperature-resistant metal materials.
As a further description of the above scheme, the metal phase contains the following components in percentage by mass: 20% of Zr, 8% of Zn, 5% of Al, 2.0% of V, 0.1% of Be, 0.024% of Sn and the balance of Mn.
As a further description of the above scheme, the ceramic phase comprises the following components in percentage by mass: MgCr 2 O 4 30% of ZnCr 2 O 4 20% of TiO 2 10% of ZrO 2 5% of the total amount of SiC.
Example 2
A cold stamping die surface laser spraying processing method, on the basis of the chrome plating of the die surface, utilize laser spraying, spray the metal ceramic coating on the die, the metal phase accounts for 45% in the metal ceramic coating, the ceramic phase accounts for 35%, the remainder is the adhesive, including the following steps:
s1: firstly, carrying out chrome plating on a cold stamping die to form a plating layer with the thickness of 1.3 microns on the surface, carrying out heat treatment after washing, carrying out high-temperature quenching at the high-temperature quenching temperature of 520 ℃, carrying out high-temperature tempering for 2 times, carrying out heat preservation at the tempering temperature of 430 ℃ for 3.5 hours, finally cooling to 125 ℃ with cold water, controlling the cooling speed at 14 ℃/min, and then naturally cooling to room temperature;
s2: grinding metal phase components into powder of 25 meshes, putting the powder and ceramic powder into a glass mortar, grinding and grinding to 55 meshes, adding a binder, uniformly stirring the components, performing pressure sintering at 5.4MPa and 660 ℃ for 2.5 hours, presetting the components on the surface of a mold after heat treatment and cooling, wherein the thickness of a preset layer is 60 microns, preheating the components at 210 ℃, performing laser spraying processing, ensuring the laser output power to be 950W and the scanning speed to be 13 mm/s under the protection of argon gas, immediately removing laser after a coating is melted, cooling, solidifying and polishing to be smooth.
Preferably, the stamping die is cleaned, degreased and polished before chrome plating, a direct current electroplating process is adopted, the current density is 31A/dm2, and the concentration of the components of the plating solution is as follows: CrO3:240g/L, H2SO4:2.55g/L, Cr3+:2.1g/L, Fe3+:0.9g/L, and the electroplating temperature is 54 ℃.
Further, the binder is obtained by mixing a sodium silicate aqueous solution with a mass concentration of 2.8% and lithium silicate with a mass concentration of 0.8% according to a mass ratio of 7.5: 1.5.
The cold stamping die aims at high-temperature-resistant metal materials.
As a further description of the above scheme, the metal phase contains the following components in percentage by mass: 23% of Zr, 9% of Zn, 6% of Al, 2.5% of V, 0.15% of Be, 0.03% of Sn and the balance of Mn.
As a further description of the above scheme, the ceramic phase comprises the following components in percentage by mass: MgCr 2 O 4 35% of ZnCr 2 O 4 25% of TiO 2 13% of ZrO 2 Accounting for 8 percent, and the balance being SiC.
Example 3
A cold stamping die surface laser spraying processing method, on the basis of the chrome plating of the die surface, utilize laser spraying, spray the metal ceramic coating on the die, the metal phase accounts for 50% in the metal ceramic coating, the ceramic phase accounts for 40%, the remainder is the adhesive, including the following steps:
s1: firstly, carrying out chrome plating on a cold stamping die to form a plating layer with the thickness of 1.5 microns on the surface, carrying out heat treatment after washing, carrying out high-temperature quenching firstly, wherein the high-temperature quenching temperature is 540 ℃, the high-temperature tempering is carried out for 2 times, the tempering temperature is 450 ℃, the heat preservation is carried out for 4 hours, finally, the temperature is reduced to 130 ℃ by cold water, the temperature reduction speed is controlled at 15 ℃/min, and then, the temperature is naturally cooled to room temperature;
s2: grinding metal phase components into powder of 30 meshes, putting the powder and ceramic powder into a glass mortar, grinding and grinding to 60 meshes, adding a binder, uniformly stirring the components, performing pressure sintering at 5.6MPa and 670 ℃ for 3 hours, presetting the powder on the surface of a mold after heat treatment and cooling, wherein the thickness of a preset layer is 70 microns, preheating the powder at 220 ℃, performing laser spraying processing, ensuring the laser output power to be 1000W and the scanning speed to be 14 mm/s under the protection of argon gas, immediately removing laser after a coating is melted, cooling, solidifying and polishing to be smooth.
Preferably, the stamping die is cleaned, degreased and polished before chrome plating, a direct current electroplating process is adopted, the current density is 32A/dm2, and the concentration of the components of the plating solution is as follows: CrO3, 250g/L, H2SO4, 2.6g/L, Cr3+, 2.2g/L, Fe3+ and 1.0g/L, and the electroplating temperature is 55 ℃.
Further, the binder is obtained by mixing a sodium silicate aqueous solution with a mass concentration of 3.0% and lithium silicate with a mass concentration of 1.0% according to a mass ratio of 8: 2.
The cold stamping die aims at high-temperature-resistant metal materials.
As a further description of the above scheme, the metal phase contains the following components in percentage by mass: 25% of Zr, 10% of Zn, 7% of Al, 3.0% of V, 0.2% of Be, 0.04% of Sn and the balance of Mn.
As a further description of the above scheme, the ceramic phase comprises the following components in percentage by mass: MgCr 2 O 4 40% of ZnCr 2 O 4 30% of TiO 2 15% of ZrO 2 Accounting for 10% and the balance being SiC.
In the control group, the high-hardness and long-service-life chromium plating mold disclosed by the Chinese invention with the publication number of CN201810925958.X and the mold making process thereof are used for replacing the mold treatment method of the embodiment, and the rest is kept unchanged.
First, performance experiment
The method of the embodiment 1-3 and the comparison group of the invention is used for processing the material of the impact-resistant die, HT300 is used as a die body (the tensile strength is 300 MPa), the length, the width and the thickness of the sample are respectively 120 mm, 80 mm and 5 mm, 5 samples are selected from each group and are respectively processed, the performance change of the sample is measured by adopting the GB/T37782-2019 standard, the influence of the processing method and the comparison group of the invention on the performance of the die material is compared, the consistency of independent variables in the test is kept, the effective average value is counted (the test design is carried out by using a statistical method before the test, then the test is carried out and the test data is recorded, the test result is obtained by analysis, the result is fully explained by using the statistical tool to the maximum degree in the process), and the results are shown in the following table:
| item | Brinell Hardness (HB) | Breaking Strength (MPa) | Tensile strength (MPa) |
| Example 1 | 316 | 488 | 372 |
| Example 2 | 322 | 493 | 376 |
| Example 3 | 319 | 490 | 373 |
| Control group | 253 | 373 | 325 |
The invention changes the shape, chemical composition, tissue structure and stress state of the surface of the die by surface coating and surface modification composite treatment technology, so as to improve the service quality and the service life of the die, utilizes laser spraying and uses cermet materials, the coating material has the characteristics of high reliability, good consistency and high response speed, the surface of the coating material is strengthened by spraying the metal ceramic coating on the die, the cold stamping die can improve the performances of hardness, viscosity resistance, impact resistance, wear resistance, cold and hot fatigue resistance and the like, has extremely strong repairing effect, has excellent deformation resistance toughness and higher compressive strength, effectively improves the service performance of the cold stamping die, prolongs the service life under high-frequency use, not only reduces the resource consumption, but also saves the enterprise cost, has wide application prospect, and lays a foundation for the research of novel wear-resistant and impact-resistant materials.
Claims (3)
1. A cold stamping die surface laser spraying processing method is characterized in that on the basis of chrome plating on the die surface, a metal ceramic coating is sprayed on the die by laser spraying, wherein the metal phase in the metal ceramic coating accounts for 40-50%, the ceramic phase accounts for 30-40%, and the rest is adhesive, and the method specifically comprises the following steps:
(1) firstly, performing chrome plating on a cold stamping die to form a plating layer with the thickness of 1.0-1.5 microns on the surface, performing heat treatment after washing, performing high-temperature quenching at the temperature of 500-540 ℃, performing high-temperature tempering for 2 times at the temperature of 400-450 ℃, preserving heat for 3-4 hours, finally cooling to 120-130 ℃ with cold water, controlling the cooling speed to be 13-15 ℃/min, and naturally cooling to room temperature;
(2) grinding metal phase components into powder of 20-30 meshes, putting the powder and ceramic powder into a glass mortar, grinding and crushing the powder to 50-60 meshes, adding a binder, uniformly stirring the components, performing pressure sintering at 5.3-5.6MPa and 650-670 ℃ for 2-3 hours, presetting the components on the surface of a mold after heat treatment and cooling, wherein the thickness of the preset layer is 50-70 microns, preheating the components at 200-220 ℃, performing laser spraying processing, the laser output power is 900-1000W, the scanning speed is 12-14 mm/s under the protection of argon gas, immediately removing laser after the coating is melted, cooling, solidifying and polishing smoothly;
the metal phase comprises the following components in percentage by mass: 20-25% of Zr, 8-10% of Zn, 5-7% of Al, 2.0-3.0% of V, 0.1-0.2% of Be, 0.02-0.04% of Sn and the balance of Mn;
the ceramic phase comprises the following components in percentage by mass: MgCr 2 O 4 Is 30 to 40 percent、ZnCr 2 O 4 20-30% of TiO 2 10-15% of ZrO 2 5-10% of the total weight of the SiC powder.
2. The method of claim 1, wherein the stamping die is cleaned, degreased and polished before chrome plating, and a direct current plating process is adopted, wherein the current density is 30-32A/dm 2 The plating solution comprises the following components: CrO 3 :230-250g/L、H 2 SO 4 :2.5-2.6g/L、Cr 3+ :2.0-2.2g/L、Fe 3+ 0.8-1.0g/L, and the electroplating temperature is 53-55 ℃.
3. The cold stamping die surface laser spraying treatment method as claimed in claim 1, wherein the binder is obtained by mixing 2.7-3.0% by mass of sodium silicate aqueous solution and 0.6-1.0% by mass of lithium silicate in a mass ratio of 7-8: 1-2.
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| JPH09217101A (en) * | 1995-12-05 | 1997-08-19 | Toto Ltd | Production of powder metallurgical product |
| JPH11209863A (en) * | 1998-01-27 | 1999-08-03 | Asahi Glass Co Ltd | Production of wear resistant parts |
| US6623876B1 (en) * | 1997-05-28 | 2003-09-23 | Invegyre Inc. | Sintered mechanical part with abrasionproof surface and method for producing same |
| EP1520643A1 (en) * | 2003-10-01 | 2005-04-06 | KM Europa Metal Aktiengesellschaft | Method for coating a mould body used in a continuous casting machine and mould body thus obtained |
| CN107058934A (en) * | 2017-04-12 | 2017-08-18 | 滁州市东华模具制造有限公司 | A kind of method that use composite coating improves service life of cold-stamping mould of automobile |
| CN107488851A (en) * | 2017-08-11 | 2017-12-19 | 宁国市润丰金属制品有限公司 | A kind of metal-cermic coating suitable for stainless steel |
| CN108842124A (en) * | 2018-06-04 | 2018-11-20 | 重庆市科学技术研究院 | A kind of method of laser melting coating reparation and reinforcing mold |
-
2020
- 2020-08-07 CN CN202010788279.XA patent/CN111893416B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09217101A (en) * | 1995-12-05 | 1997-08-19 | Toto Ltd | Production of powder metallurgical product |
| US6623876B1 (en) * | 1997-05-28 | 2003-09-23 | Invegyre Inc. | Sintered mechanical part with abrasionproof surface and method for producing same |
| JPH11209863A (en) * | 1998-01-27 | 1999-08-03 | Asahi Glass Co Ltd | Production of wear resistant parts |
| EP1520643A1 (en) * | 2003-10-01 | 2005-04-06 | KM Europa Metal Aktiengesellschaft | Method for coating a mould body used in a continuous casting machine and mould body thus obtained |
| CN107058934A (en) * | 2017-04-12 | 2017-08-18 | 滁州市东华模具制造有限公司 | A kind of method that use composite coating improves service life of cold-stamping mould of automobile |
| CN107488851A (en) * | 2017-08-11 | 2017-12-19 | 宁国市润丰金属制品有限公司 | A kind of metal-cermic coating suitable for stainless steel |
| CN108842124A (en) * | 2018-06-04 | 2018-11-20 | 重庆市科学技术研究院 | A kind of method of laser melting coating reparation and reinforcing mold |
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