CN112176278A - Surface treatment technology for TD-H superhard die - Google Patents
Surface treatment technology for TD-H superhard die Download PDFInfo
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- CN112176278A CN112176278A CN201910603445.1A CN201910603445A CN112176278A CN 112176278 A CN112176278 A CN 112176278A CN 201910603445 A CN201910603445 A CN 201910603445A CN 112176278 A CN112176278 A CN 112176278A
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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
- C23C12/00—Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces
- C23C12/02—Diffusion in one step
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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
Abstract
The invention discloses a surface treatment technology of a TD-H superhard die, which comprises the following specific steps: the first step is as follows: firstly, placing a workpiece to be processed into a reaction furnace for preheating, and heating to 400-460 ℃; the second step is that: continuously and rapidly heating the preheated part to 1000-1050 ℃; the third step: introducing gasified chemical solid salt into the reaction furnace, generally introducing gasified vanadium carbide, and performing high-temperature diffusion on the metal surface after introducing gas vanadium carbide to form a metal vanadium carbide coating, wherein the service life of the workpiece can be greatly prolonged through the coating; the fourth step: cooling the reacted workpiece in a furnace to room temperature, and a fifth step: and then, the cooled workpiece is heated to the condensation temperature again for quenching so as to enhance the hardness of the workpiece. The invention has better use effect, and can effectively prevent the workpiece from cracking and deforming during processing so as to improve the processing quality of the workpiece.
Description
Technical Field
The invention relates to the technical field of material processing, in particular to a surface treatment technology for a TD-H superhard die.
Background
The coating treatment is short for the carbide coating treatment by the thermal diffusion method. The technology is firstly developed and patented by the central research institute of Toyota, Japan, and is also called TD treatment. China also refers to molten salt metal infiltration. Regardless of the name, the principle is that a workpiece is placed in a molten borax mixture, a metal carbide coating is formed on the surface of the workpiece through high-temperature diffusion, and the workpiece is processed by matching with the traditional quenching and tempering processes after being coated with a film, so that the use effect and the service life of the workpiece are improved.
However, in the currently used film coating treatment technology, in the step of coating the surface of the workpiece, a solid chemical salt is often used for coating the surface of the workpiece, but the fixed chemical salt has low working efficiency during film coating and poor film coating effect, and directly enters a quenching stage of rapid cooling after film coating, so that the film layer on the surface of the workpiece just coated is cracked, the film coating effect is reduced, and the film layer is easy to crack and deform.
Disclosure of Invention
The invention aims to provide a surface treatment technology for a TD-H superhard die, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the first step is as follows: firstly, placing a workpiece to be processed into a reaction furnace for preheating, and heating to 400-460 ℃;
the second step is that: continuously and rapidly heating the preheated part to 1000-1050 ℃;
the third step: introducing gasified chemical solid salt into the reaction furnace, generally introducing gasified vanadium carbide, and performing high-temperature diffusion on the metal surface after introducing gas vanadium carbide to form a metal vanadium carbide coating, wherein the service life of the workpiece can be greatly prolonged through the coating;
the fourth step: cooling the reacted workpiece in a furnace to room temperature;
the fifth step: then, the cooled workpiece is heated to the critical temperature again for quenching so as to enhance the hardness of the workpiece;
and a sixth step: and (3) reheating the quenched workpiece to 500-600 ℃ for tempering so as to reduce the brittleness of the workpiece.
Preferably, the preheating in the first step needs to relieve heating, so that the heating speed is prevented from being high, the workpiece is rapidly heated from room temperature to high temperature, and the workpiece is heated to expand too fast to crack.
Preferably, the chemical solid salt in the third step may be carbides of vanadium, niobium, chromium, tantalum, titanium, and the like, or composite carbides thereof, wherein the most widely used carbides are vanadium carbide coating layers, after the coating treatment of the workpiece by the carbides, the carbide is one of the most economic and effective methods for solving the strain problem at present, and can improve the service life of the tool and the die or the part by several times to several tens of times, thereby having great use value, and simultaneously, the introduced chemical salt is gasified chemical salt, and can improve the film coating effect during film coating.
Preferably, when the gasified chemical salt is introduced in the third step, a vacuum environment is required to be ensured in the reaction furnace, and the coating effect of the gasified chemical salt on the workpiece is improved through the vacuum environment.
Preferably, when the workpiece is cooled in the furnace in the fourth step, natural cooling is required to be performed naturally, so that the workpiece just after being coated is prevented from being cracked due to rapid cooling.
Preferably, water cooling quenching or oil cooling quenching is adopted for quenching in the fifth step, and the quality of the workpiece can be greatly improved through the water cooling quenching or the oil cooling quenching.
Preferably, in the sixth step, in the tempering, the workpiece needs to be heated and then naturally cooled, so as to reduce brittleness of the finished workpiece.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by preheating the required processing to be relieved, the workpiece can be effectively prevented from being heated at a high speed, and the workpiece is heated from room temperature to high temperature quickly, so that the workpiece is heated and expanded too fast to crack;
2. according to the invention, gasified chemical salt is introduced during film coating, and the introduced reaction furnace is in a vacuum environment, so that the gasified chemical salt can be fully and tightly contacted with a workpiece, the film coating effect and the film coating speed are improved, and the formed film can be more compact;
3. the invention firstly carries out natural cooling and then quenching operation on the workpiece after film covering forming, prevents the coated film layer from breaking caused by quenching after the film covering is successfully carried out, thereby improving the finished product quality of the workpiece, and the coating film and the tempering quenching process are separately processed to easily control cracking and deformation;
4. through subsequent quenching and tempering operations, the invention can eliminate the residual stress generated during workpiece quenching, prevent deformation and cracking, adjust the hardness, strength, plasticity and toughness of the workpiece, meet the requirements of service performance, stabilize the structure and size of the workpiece, ensure the improvement of precision and improve the processing performance, effectively improve the hardness of the workpiece and reduce the brittleness of the workpiece.
Drawings
FIG. 1 is a block diagram of the surface treatment technique of a TD-H superhard mold according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a surface treatment technology for a TD-H superhard die comprises the following specific steps:
example 1
The first step is as follows: firstly, placing a workpiece to be processed into a reaction furnace for preheating, heating to 400 ℃, wherein the preheating needs to be relieved for heating, so that the heating speed is prevented from being high, and the workpiece is rapidly heated from room temperature to high temperature, so that the workpiece is heated and expanded too fast to crack;
the second step is that: continuously and rapidly heating the preheated part to 1000 ℃;
the third step: the method comprises the following steps of introducing gasified chemical solid salt into a reaction furnace, introducing gasified vanadium carbide, and then performing high-temperature diffusion on the surface of metal to form a metal vanadium carbide coating, wherein the service life of a workpiece can be greatly prolonged through the coating;
the fourth step: cooling the reacted workpiece in a furnace to room temperature, and naturally cooling the workpiece in advance to prevent the workpiece which is just coated from cracking the coating when rapidly cooling the workpiece;
the fifth step: then, the cooled workpiece is heated to the critical temperature again for quenching so as to enhance the hardness of the workpiece;
and a sixth step: and (3) reheating the quenched workpiece to 500 ℃ for tempering so as to reduce the brittleness of the workpiece.
Example 2
The first step is as follows: firstly, placing a workpiece to be processed into a reaction furnace for preheating, heating to 420 ℃, wherein the preheating needs to be relieved for heating, so that the heating speed is prevented from being high, and the workpiece is rapidly heated from room temperature to high temperature, so that the workpiece is heated and expanded too fast to crack;
the second step is that: continuously and rapidly heating the preheated part to 1030 ℃;
the third step: the method comprises the following steps of introducing gasified chemical solid salt into a reaction furnace, introducing gasified niobium carbide, and then performing high-temperature diffusion on the surface of metal to form a metal niobium carbide coating, wherein the service life of a workpiece can be greatly prolonged through the coating;
the fourth step: cooling the reacted workpiece in a furnace to room temperature, and naturally cooling the workpiece in advance to prevent the workpiece which is just coated from cracking the coating when rapidly cooling the workpiece;
the fifth step: then, the cooled workpiece is heated to the critical temperature again for quenching so as to enhance the hardness of the workpiece;
and a sixth step: and (3) reheating the quenched workpiece to 550 ℃ for tempering so as to reduce the brittleness of the workpiece.
Example 3
The first step is as follows: firstly, placing a workpiece to be processed into a reaction furnace for preheating, heating to 460 ℃, wherein the preheating needs to be relieved for heating, so that the heating speed is prevented from being high, and the workpiece is rapidly heated from room temperature to high temperature, so that the workpiece is heated and expanded too fast to crack;
the second step is that: continuously and rapidly heating the preheated part to 1050 ℃;
the third step: the method comprises the following steps of introducing gasified chemical solid salt into a reaction furnace, introducing gasified chromium carbide, and then performing high-temperature diffusion on the metal surface to form a metal chromium carbide coating, wherein the service life of a workpiece can be greatly prolonged through the coating;
the fourth step: cooling the reacted workpiece in a furnace to room temperature, and naturally cooling the workpiece in advance to prevent the workpiece which is just coated from cracking the coating when rapidly cooling the workpiece;
the fifth step: then, the cooled workpiece is heated to the critical temperature again for quenching so as to enhance the hardness of the workpiece;
and a sixth step: and (3) reheating the quenched workpiece to 600 ℃ for tempering so as to reduce the brittleness of the workpiece.
The preheating in the first step needs to relieve heating, the heating speed is prevented from being high, the workpiece is rapidly heated from room temperature to high temperature, the workpiece is heated to expand too fast and crack, the chemical solid salt in the third step can be carbides of vanadium, niobium, chromium, tantalum, titanium and the like, and can also be composite carbides of the carbides, wherein the most widely applied vanadium carbide coating is one of the economic and most effective methods for solving the strain problem after coating treatment is carried out on the workpiece, the service life of a tool and a die or parts can be prolonged by several times to several times, the method has great use value, the introduced chemical salt is gasified chemical salt, the coating effect of the gasified chemical salt can be improved when the coating is carried out, the vacuum environment in a reaction furnace needs to be ensured when the gasified chemical salt is introduced in the third step, the coating effect of the gasified chemical salt on the workpiece is improved through the vacuum environment, and in the fourth step, when the workpiece is cooled in the furnace, natural cooling is required to be naturally carried out firstly, so that the coated workpiece is prevented from being cracked when the coated workpiece is rapidly cooled, in the fifth step, water cooling quenching or oil cooling quenching is adopted for quenching, the quality of the workpiece can be greatly improved through the water cooling quenching or the oil cooling quenching, and in the sixth step, in tempering, the workpiece is required to be naturally cooled after being heated, so that the brittleness of the finished workpiece is reduced.
The working principle is as follows: the first step is as follows: firstly, placing a workpiece to be processed into a reaction furnace for preheating, and heating to 400-460 ℃; the second step is that: continuously and rapidly heating the preheated part to 1000-1050 ℃; the third step: the method comprises the following steps of introducing gasified chemical solid salt into a reaction furnace, generally introducing gasified vanadium carbide, and performing high-temperature diffusion on the surface of metal after introducing gas vanadium carbide to form a metal vanadium carbide coating, wherein the coating can greatly prolong the service life of a workpiece, the introduced chemical solid salt can be carbides of vanadium, niobium, chromium, tantalum, titanium and the like, and can also be composite carbides of the carbides, the most widely applied vanadium carbide coating is adopted, after the carbides carry out coating treatment on the workpiece, the method is one of the most effective and economical methods for solving the problem of strain injury at present, the service life of a tool and a die or a part can be prolonged by several times to several tens times, the method has high use value, and meanwhile, the introduced chemical salt is gasified chemical salt and can improve the film coating effect of the workpiece when coating; the fourth step: cooling the reacted workpiece in a furnace to room temperature; the fifth step: then, the cooled workpiece is heated to the critical temperature again for quenching so as to enhance the hardness of the workpiece; and a sixth step: the quenched workpiece is heated to 500-600 ℃ again for tempering processing to reduce the brittleness of the workpiece, gasified chemical salt can be in full and tight contact with the workpiece through the method to improve the film coating effect and the film coating speed, so that the formed film can be more compact, rapid cooling is prevented from being carried out just after the film coating is successfully carried out, the film coating is quenched to cause the breakage of the coated film layer, and the quality of the finished product of the workpiece is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A surface treatment technology for a TD-H superhard die comprises the following specific steps:
the first step is as follows: firstly, placing a workpiece to be processed into a reaction furnace for preheating, and heating to 400-460 ℃;
the second step is that: continuously and rapidly heating the preheated part to 1000-1050 ℃;
the third step: introducing gasified chemical solid salt into the reaction furnace, generally introducing gasified vanadium carbide, and performing high-temperature diffusion on the metal surface after introducing gas vanadium carbide to form a metal vanadium carbide coating, wherein the service life of the workpiece can be greatly prolonged through the coating;
the fourth step: cooling the reacted workpiece in a furnace to room temperature;
the fifth step: then, the cooled workpiece is heated to the critical temperature again for quenching so as to enhance the hardness of the workpiece;
and a sixth step: and (3) reheating the quenched workpiece to 500-600 ℃ for tempering so as to reduce the brittleness of the workpiece.
2. A TD-H superhard mold surface treatment technology according to claim 1, wherein: the preheating in the first step needs to be relieved for heating, so that the heating speed is prevented from being high, the workpiece is rapidly heated from room temperature to high temperature, and the workpiece is heated to expand too fast to crack.
3. A TD-H superhard mold surface treatment technology according to claim 1, wherein: the chemical solid salt in the third step can be carbides of vanadium, niobium, chromium, tantalum, titanium and the like, and can also be composite carbides of the carbides, wherein the vanadium carbide coating is most widely applied.
4. A TD-H superhard mold surface treatment technology according to claim 1, wherein: and when the gasified chemical salt is introduced in the third step, the vacuum environment in the reaction furnace is required to be ensured, and the coating effect of the gasified chemical salt on the workpiece is improved through the vacuum environment.
5. A TD-H superhard mold surface treatment technology according to claim 1, wherein: and in the fourth step, when the workpiece is cooled in the furnace, natural cooling is required to be naturally carried out firstly, so that the workpiece which is just coated is prevented from causing coating cracking when being rapidly cooled.
6. A TD-H superhard mold surface treatment technology according to claim 1, wherein: and in the fifth step, water cooling quenching or oil cooling quenching is adopted for quenching, and the quality of the workpiece can be greatly improved through the water cooling quenching or the oil cooling quenching.
7. A TD-H superhard mold surface treatment technology according to claim 1, wherein: in the sixth step, in the tempering process, the workpiece needs to be heated and then naturally cooled, so that the brittleness of the finished workpiece is reduced.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0578977A (en) * | 1991-09-12 | 1993-03-30 | Nippon Cement Co Ltd | Production of surface-coated carbon fiber |
| CN103276184A (en) * | 2013-06-17 | 2013-09-04 | 沈阳飞机工业（集团）有限公司 | Heat treatment process for high-speed steel plane cutter |
| CN105002507A (en) * | 2015-02-06 | 2015-10-28 | 襄阳长源东谷实业股份有限公司 | 17CrNiMo6 material gear machining process |
| CN108315689A (en) * | 2018-01-10 | 2018-07-24 | 广州市芸霖材料表面技术有限公司 | A kind of TD treatment process |
-
2019
- 2019-07-05 CN CN201910603445.1A patent/CN112176278A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0578977A (en) * | 1991-09-12 | 1993-03-30 | Nippon Cement Co Ltd | Production of surface-coated carbon fiber |
| CN103276184A (en) * | 2013-06-17 | 2013-09-04 | 沈阳飞机工业（集团）有限公司 | Heat treatment process for high-speed steel plane cutter |
| CN105002507A (en) * | 2015-02-06 | 2015-10-28 | 襄阳长源东谷实业股份有限公司 | 17CrNiMo6 material gear machining process |
| CN108315689A (en) * | 2018-01-10 | 2018-07-24 | 广州市芸霖材料表面技术有限公司 | A kind of TD treatment process |
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Effective date of registration: 20210803 Address after: 300000 hengze Industrial Park, Shuanggang Town Industrial Park, Jinnan District, Tianjin 45-109-96 Applicant after: Toyo (Tianjin) nanotechnology Co.,Ltd. Address before: No.18, Jiajing Road, liuanzhuang Industrial Zone, Xiaodian Town, Beichen District, Tianjin 300203 Applicant before: Tianjin Eurasian Sith metal products Co.,Ltd. |
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Application publication date: 20210105 |
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