CN109504935B - Heat treatment process for thin metal piece - Google Patents
Heat treatment process for thin metal piece Download PDFInfo
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- CN109504935B CN109504935B CN201811547987.3A CN201811547987A CN109504935B CN 109504935 B CN109504935 B CN 109504935B CN 201811547987 A CN201811547987 A CN 201811547987A CN 109504935 B CN109504935 B CN 109504935B
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000010438 heat treatment Methods 0.000 title claims abstract description 29
- 239000002184 metal Substances 0.000 title claims abstract description 25
- 230000008595 infiltration Effects 0.000 claims abstract description 36
- 238000001764 infiltration Methods 0.000 claims abstract description 36
- 238000010791 quenching Methods 0.000 claims abstract description 16
- 230000000171 quenching effect Effects 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 39
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 35
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000005496 tempering Methods 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- 239000001294 propane Substances 0.000 claims description 8
- 238000012805 post-processing Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007669 thermal treatment Methods 0.000 claims 1
- 239000000047 product Substances 0.000 abstract description 21
- 238000004381 surface treatment Methods 0.000 abstract description 3
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical group [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 abstract description 2
- 230000008646 thermal stress Effects 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 230000000149 penetrating effect Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000004080 punching Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 238000004040 coloring Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 238000005256 carbonitriding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Classifications
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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
- C23C8/06—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
- C23C8/20—Carburising
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to the technical field of surface treatment, and discloses a heat treatment process for a sheet metal part, which comprises the following steps: preparation, preheating, temperature equalization, forced infiltration, temperature reduction, quenching, cleaning, drying, flattening and post-treatment. At first through preheating, let the work piece heating of each position, let the work piece can enter into the infiltration state, and let the temperature of holistic work piece even through the samming, let the infiltration of each position more even, thereby let its surface structure more even, the rethread is oozed by force, let the work piece surface permeate, through cooling down, let the carbon nitrogen atom of infiltration can diffuse, thereby let its surface structure more even at the even in-process of cooling, at last when quenching, the temperature reduction of each position is more balanced, thereby let the thermal stress that the work piece received comparatively even, thereby reduce the deformation degree of work piece, improve the quality of product, at last through flattening, further to the roughness that improves the work piece, thereby improve the quality of work piece.
Description
Technical Field
The invention relates to the technical field of surface treatment, in particular to a heat treatment process for a sheet metal part.
Background
A metal plate is a workpiece formed by press molding a metal plate, and is widely used. The surface of the metal plate is generally worn when the metal plate is used, and the metal plate itself is thin, so that the degree and time of wear are affected by the metal material when the metal plate is used, and the surface strength of the workpiece is improved by surface treatment of the workpiece in order to improve the surface structural strength of the metal plate.
At present, the structural strength of the metal surface is generally improved by adopting a heat treatment mode, and the metal plate is easy to deform in a high-temperature state, so that the structure of a final product is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a heat treatment process for a sheet metal part, which enables the flatness of a workpiece to be higher through temperature equalization and flattening treatment.
In order to achieve the purpose, the invention provides the following technical scheme:
a heat treatment process for a sheet metal part comprises the following steps:
step 1: preparing, namely feeding the stacked plates into a heat treatment furnace chamber, and sealing the furnace chamber;
step 2: preheating, namely preheating the workpiece by heating at low carbon potential in a furnace chamber until the temperature reaches the pre-permeation temperature;
and step 3: temperature equalization, namely performing high-carbon potential temperature equalization treatment after the temperature reaches the pre-permeation temperature until the temperature reaches a preset strong permeation temperature and finishing the temperature equalization process for a period of time;
and 4, step 4: strong infiltration, maintaining high carbon potential and strong infiltration temperature for strong infiltration treatment;
and 5: cooling, namely cooling to the pre-permeation temperature, and performing cooling treatment with high carbon potential;
step 6: quenching, namely quenching the cooled workpiece;
and 7: cleaning, namely cleaning the surface of the quenched workpiece;
and 8: drying, namely drying the cleaned workpiece;
and step 9: flattening, namely flattening the dried workpiece by flattening equipment;
step 10: and (4) post-processing, namely performing post-processing on the flattened workpiece and packaging.
Through the technical scheme, the temperature of the workpiece placed in each position in the furnace chamber is heated through preheating, so that the workpiece can enter a permeation state, the temperature of the whole workpiece is uniform through uniform temperature, the heat treatment is uniform, the permeation of each position is uniform, the surface structure of the workpiece is uniform, the surface of the workpiece is permeated through forced permeation, the permeated carbon nitrogen atoms can be diffused through cooling, the surface structure of the workpiece is more uniform in the uniform cooling process, finally, the temperature reduction of each position is uniform during quenching, the thermal stress of the workpiece is uniform, the deformation degree of the workpiece is reduced, the quality of a product is improved, the flatness of the workpiece is further improved through flattening, the quality of the workpiece is improved, and the product is shot-blasted after flattening, Low-temperature coloring, and the like, and the hardness, the penetration depth and the flatness of the product are checked, and finally, the product can be packaged by soaking rust preventive oil after the surface is checked to be free of impurities.
The invention is further configured to:
in the step 2, the carbon potential is 0.6-0.8, the preheating time is 5-20min, wherein the pre-permeation temperature is 830-850 ℃; in the step 3, the carbon potential is 0.9-1.1, the whole time from the pre-permeation temperature to the strong permeation temperature is 5-10min, and the strong permeation temperature is 850-870 ℃;
in step 4, the carbon potential is 0.9-1.1, and the maintaining time is 120-;
in step 5, the carbon potential is 0.9-1.1, and the temperature is reduced from the strong infiltration temperature to the pre-infiltration temperature and then is maintained for 20 min.
The invention is further configured to: in the step 2, the carbon potential is 0.7, the preheating time is 10min, wherein the pre-infiltration temperature is 840 ℃;
in the step 3, the carbon potential is 1, the whole time from the pre-infiltration temperature to the strong infiltration temperature is 5min, and the strong infiltration temperature is 860 ℃;
in step 4, the carbon potential is 1, and the maintaining time is 130 min;
in step 5, the carbon potential is 1, the temperature is reduced from the strong infiltration temperature to the pre-infiltration temperature, and then the temperature is maintained for 20 min.
By adopting the technical scheme, the workpiece is pre-infiltrated by adopting low carbon potential and low temperature, part of the workpiece penetrates into the surface of the workpiece in the process of heating the workpiece, meanwhile, the temperature of the workpiece at each position reaches the preset temperature, the structure of the surface of the workpiece is formed uniformly, then strong infiltration is carried out by high carbon potential and strong infiltration temperature, the penetrating agent can effectively enter the surface of the workpiece, then the temperature is reduced under the condition of high carbon potential, the penetrating agent on the surface of the workpiece can be diffused, so that the penetrating agent on the surface of the workpiece can not overflow under the environment of high-concentration penetrating agent, the penetrating efficiency of the surface of the workpiece is improved, the temperature of the workpiece at each position is uniformly reduced, the temperature before quenching can be equal, and further, the temperature at each position is the same during quenching, and further, the reduction temperature of quenching is the same, thereby reducing the deformation of the workpiece in the quenching process.
The invention is further configured to: and (5) continuously introducing the methanol in the process from the step 2 to the step 5, wherein the methanol introducing speed is 3-5 liters per hour.
Through the technical scheme, methanol is introduced into the step 2 to perform carburization, and pre-infiltration is performed through the penetrant with low carbon content.
The invention is further configured to: during the steps 3 to 4, the propane was continuously introduced at a rate of 0.4 to 0.8 cubic meter per hour.
Through the technical scheme, the carbon content of propane is large, and the carbon potential is improved by adding the penetrant with high carbon content.
The invention is further configured to: during step 5, the propane feed was continued at a rate of 0.5 cubic meters per hour.
With the above-described configuration, since the supply of propane is increased in step 5, the amount of methanol can be appropriately reduced, and the carbon potential can be maintained.
The invention is further configured to: and in the step 3, ammonia gas is introduced when the temperature of the uniform temperature reaches the strong permeation temperature, and the ammonia gas is continuously introduced until the step 5 is finished, wherein the introduction speed of the ammonia gas is 0.4-0.6 cubic meter per hour.
Through above-mentioned technical scheme, through at the strong infiltration in-process ammonia that begins to let it carry out nitrogen atom's infiltration, and then improve workpiece surface's nitrogen content, improve workpiece surface's structural strength.
The invention is further configured to: a tempering step is arranged between the step 8 and the step 9, the temperature of the tempering step is 130-170 ℃, and the tempering time is 60-120 min.
Through the technical scheme, tempering is carried out after drying, and low-temperature tempering is adopted, so that the stress after quenching can be eliminated, the toughness and the plasticity of the product are improved, and the product cannot be easily cracked in the flattening process and in subsequent use.
The invention is further configured to: in step 9, the equipment of flattening includes the frame, installs the base in the frame and fixes the punching press mechanism that carries out reciprocal punching press to the base in the frame, be provided with the die block that is used for laying the work piece on the base, install the moulding-die that matches with the work piece in the punching press mechanism, punching press mechanism promotes the moulding-die and flattens the work piece on the die block, be provided with heating device on the die block.
Through above-mentioned technical scheme, punching press mechanism promotes the moulding-die and carries out reciprocating motion to the die block, and then lets the work piece as for on the die block to let the moulding-die carry out the punching press to the work piece, and then further flatten the work piece, and through heating device's setting, let its in-process that flattens heat, thereby let it flatten more convenient.
The invention is further configured to: the base is provided with a sliding groove used for enabling the workpiece to slide to the bottom die and a pushing piece used for pushing the workpiece into the bottom die, and the pushing piece slides along the sliding groove and pushes the workpiece in the sliding groove to the bottom die.
Through the technical scheme, the workpiece is placed in the sliding groove, and the pushing piece pushes the workpiece into the bottom die, so that the workpiece is not required to be directly sent to the bottom die by a person, and the workpiece is safer in the operation process.
Drawings
FIG. 1 is a block diagram of the procedure of example 1;
FIG. 2 is a view showing a heat treatment process in comparative example 1;
fig. 3 is a structural view of the flattening apparatus.
Reference numerals: 1. a frame; 2. a stamping mechanism; 3. pressing the die; 4. bottom die; 5. a chute; 6. a pusher member; 7. a heating device.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Examples
A process for heat treating a thin sheet metal part, as shown in fig. 1, comprising the steps of:
step 1: preparing, namely feeding the stacked plates into a heat treatment furnace chamber, and sealing the furnace chamber;
step 2: preheating, namely preheating the workpiece by heating at low carbon potential in a furnace chamber until the temperature reaches the pre-permeation temperature;
and step 3: temperature equalization, namely performing high-carbon potential temperature equalization treatment after the temperature reaches the pre-permeation temperature until the temperature reaches a preset strong permeation temperature and finishing the temperature equalization process for a period of time;
and 4, step 4: strong infiltration, maintaining high carbon potential and strong infiltration temperature for strong infiltration treatment;
and 5: cooling, namely cooling to the pre-infiltration temperature, performing cooling treatment at high carbon potential, and maintaining the reduced temperature for heat preservation treatment;
step 6: quenching, namely quenching the cooled workpiece;
and 7: cleaning, namely cleaning the surface of the quenched workpiece;
and 8: drying, namely drying the cleaned workpiece;
and step 9: flattening, namely flattening the dried workpiece by flattening equipment;
step 10: and (4) post-processing, namely performing post-processing on the flattened workpiece and packaging.
And the post-treatment comprises inspection, shot blasting, low-temperature oxidation coloring, detection and finally immersion of anti-rust oil for packaging, so that the whole workpiece processing process is completed. The inspection is to detect the product through hardness, penetration depth, flatness and the like. And in the shot blasting process, putting the product into a shot blasting machine for treatment, and enabling the surface of the product to be smooth and clean. The color of the product can be changed by low-temperature oxidation coloring, the color of the product and the surface of the product are detected to determine whether impurities remain or not, the product can meet the requirement, and finally the product cannot be easily corroded during transportation and storage by being soaked in anti-rust oil.
In addition, an additional tempering step is adopted between drying and flattening, the tempering temperature is between 130 ℃ and 170 ℃, and the tempering time is 60-120 min. After low-temperature tempering, the stress generated by quenching is eliminated, and the plasticity and the toughness of the product are improved, so that the product is more convenient in the flattening process.
Wherein, the parameters of each step 2 to step 5 refer to the following table, wherein the temperature unit is: DEG C, the time unit is: for a min period,
wherein, in the process of temperature equalization, the time is from the pre-permeation temperature to the strong permeation temperature and the time for preheating the workpiece by heat preservation. And the time in the temperature reduction process is the time for stably keeping the temperature after the temperature is reduced from the strong permeation temperature to the pre-permeation temperature.
And (5) continuously introducing the methanol in the process from the step 2 to the step 5, wherein the methanol introducing speed is 3-5 liters per hour.
During the steps 3 to 4, the propane was continuously introduced at a rate of 0.4 to 0.8 cubic meter per hour.
During step 5, the propane feed was continued at a rate of 0.4 to 0.8 cubic meters per hour.
And in the step 3, ammonia gas is introduced when the temperature of the uniform temperature reaches the strong permeation temperature, and the ammonia gas is continuously introduced until the step 5 is finished, wherein the introduction speed of the ammonia gas is 0.4-0.6 cubic meter per hour.
And in the process of introducing the penetrant, keeping the furnace cavity in a state without air, namely before introducing the methanol, extracting the air in the furnace cavity.
In step 9, the flattening device comprises a frame 1, a base installed on the frame 1, and a stamping mechanism 2 fixed on the frame 1 for performing reciprocating stamping on the base, wherein the stamping mechanism 2 is composed of a hydraulic cylinder, a bottom die 4 for placing a workpiece is arranged on the base, a pressing die 3 matched with the workpiece is installed on the stamping mechanism 2, and the stamping mechanism 2 pushes the pressing die 3 to flatten the workpiece on the bottom die 4. The base is provided with a sliding groove 5 used for enabling a workpiece to slide to the bottom die 4 and a pushing piece 6 used for pushing the workpiece into the bottom die 4, the pushing piece 6 slides along the sliding groove 5 and pushes the workpiece in the sliding groove 5 onto the bottom die 4, and the pushing piece 6 can be pushed by an air cylinder. Set up heating device 7 on die block 4, heating device 7 can adopt the heating wire, and modes such as electrothermal tube or steam pipe let in heat, when adopting steam heating, has seted up the steam passageway in die block 4, lets in steam can enter into die block 4, and then lets it can effectually heat, and is more convenient when letting it flatten.
And (3) comparison test:
comparative example 1: as shown in FIG. 2, the workpiece is processed by the existing carbonitriding process, the product is put into a furnace chamber, the temperature is raised to 870 ℃ and 890 ℃, refer to the process (1) in FIG. 2; exhausting the air in the furnace chamber, adding a carbon atom penetrating agent and a nitrogen atom penetrating agent, and keeping the carbon potential at 0.7 (0.7%) and the nitrogen potential at 0.5 (0.5%) for 40min, which is referred to as process (2) in FIG. 2; performing strong infiltration at 870-; finally, quenching is performed, see process (4) in fig. 2.
Comparative example 2: basically the same as the steps in the embodiment, the difference lies in the difference between the step 1 and the step 2, the heating is started from low temperature, the temperature is directly heated to the strong cementation temperature by low carbon potential, and then the strong cementation is carried out.
Comparative example 3: the method is the same as the steps in the examples, and is different in the permeation temperature, wherein the pre-permeation temperature is 750-770 ℃, and the strong permeation temperature is 910-920 ℃.
According to the above examples and comparative examples, tests were carried out for surface strength, penetration depth and surface flatness, and the following table was measured:
| surface Hardness (HRC) | Depth of penetration (mm) | Surface flatness | |
| Example 1 | 56.4 | 0.18 | 0.23 |
| Example 2 | 56.3 | 0.18 | 0.38 |
| Example 3 | 56.9 | 0.19 | 0.24 |
| Example 4 | 56.1 | 0.17 | 0.31 |
| Example 5 | 56.8 | 0.18 | 0.27 |
| Example 6 | 56.2 | 0.17 | 0.39 |
| Example 7 | 55.9 | 0.19 | 0.21 |
| Example 8 | 56.0 | 0.16 | 0.33 |
| Example 9 | 56.5 | 0.17 | 0.26 |
| Comparative example 1 | 58.1 | 0.21 | 1.21 |
| Comparative example 2 | 57.6 | 0.3 | 0.81 |
| Comparative example 3 | 59.3 | 0.26 | 0.97 |
In the examples, the flatness of the flattening process was not performed in each of example 2, example 4, example 6, and example 8.
According to the above table, the flatness of the embodiment of the present invention is better than that of the comparative example, thereby allowing the product to have high quality. Through the control of temperature, can control the deformation degree of whole product in the in-process of processing, and then improve the quality of product.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A heat treatment process for a sheet metal part is characterized by comprising the following steps:
step 1: preparing, namely feeding the stacked plates into a heat treatment furnace chamber, and sealing the furnace chamber;
step 2: preheating, namely preheating the workpiece by heating at low carbon potential in a furnace chamber until the temperature reaches the pre-permeation temperature;
and step 3: temperature equalization, namely performing high-carbon potential temperature equalization treatment after the temperature reaches the pre-permeation temperature until the temperature reaches a preset strong permeation temperature and finishing the temperature equalization process for a period of time;
and 4, step 4: strong infiltration, maintaining high carbon potential and strong infiltration temperature for strong infiltration treatment;
and 5: cooling, namely cooling to the pre-permeation temperature, and performing cooling treatment with high carbon potential;
step 6: quenching, namely quenching the cooled workpiece;
and 7: cleaning, namely cleaning the surface of the quenched workpiece;
and 8: drying, namely drying the cleaned workpiece;
and step 9: flattening, namely flattening the dried workpiece by flattening equipment;
step 10: post-processing, namely performing post-processing on the flattened workpiece and packaging;
wherein,
in the step 2, the carbon potential is 0.6-0.8, the preheating time is 5-20min, wherein the pre-permeation temperature is 830-850 ℃;
in the step 3, the carbon potential is 0.9-1.1, the whole time from the pre-permeation temperature to the strong permeation temperature is 5-10min, the strong permeation temperature is 850-870 ℃, ammonia gas is introduced when the uniform temperature reaches the strong permeation temperature, and the introduction is continued until the step 5 is finished;
in step 4, the carbon potential is 0.9-1.1, and the maintaining time is 120-;
in step 5, the carbon potential is 0.9-1.1, and the temperature is reduced from the strong infiltration temperature to the pre-infiltration temperature and then is maintained for 20 min.
2. The process for heat treating a sheet metal member according to claim 1,
in the step 2, the carbon potential is 0.7, the preheating time is 10min, wherein the pre-infiltration temperature is 840 ℃;
in the step 3, the carbon potential is 1, the whole time from the pre-infiltration temperature to the strong infiltration temperature is 5min, and the strong infiltration temperature is 860 ℃;
in step 4, the carbon potential is 1, and the maintaining time is 130 min;
in step 5, the carbon potential is 1, the temperature is reduced from the strong infiltration temperature to the pre-infiltration temperature, and then the temperature is maintained for 20 min.
3. The process for heat treating a thin sheet metal member as claimed in claim 1, wherein the methanol is continuously introduced during the steps 2 to 5 at a rate of 3 to 5 liters per hour.
4. The process for heat treating a thin sheet metal member as claimed in claim 1, wherein the propane is continuously fed during steps 3 to 4 at a rate of 0.4 to 0.8 cubic meters per hour.
5. The process for heat treating a thin sheet metal member as claimed in claim 1, wherein the propane feed is continued during step 5 at a rate of 0.4 to 0.8 cubic meters per hour.
6. A process for heat treating a thin sheet metal member as claimed in claim 1, wherein the ammonia gas is introduced at a rate of 0.4 to 0.6 cubic meter per hour in steps 3 to 5.
7. The heat treatment process for thin sheet metal member as claimed in claim 1, wherein a tempering step is provided between step 8 and step 9, the temperature of the tempering step is 130-170 ℃, and the tempering time is 60-120 min.
8. The heat treatment process for the thin sheet metal part according to claim 1, wherein in the step 9, the flattening device comprises a frame (1), a base installed on the frame (1), and a stamping mechanism (2) fixed on the frame (1) for performing reciprocating stamping on the base, wherein a bottom die (4) for placing a workpiece is arranged on the base, a pressing die (3) matched with the workpiece is installed on the stamping mechanism (2), the stamping mechanism (2) pushes the pressing die (3) to flatten the workpiece on the bottom die (4), and a heating device (7) is arranged on the bottom die (4).
9. The process for the thermal treatment of sheet metal parts according to claim 8, characterized in that said base is provided with a sliding chute (5) for the sliding of the workpiece onto the bottom die (4) and with a pusher (6) for pushing the workpiece into the bottom die (4), said pusher (6) sliding along the sliding chute (5) pushing the workpiece in the sliding chute (5) onto the bottom die (4).
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| CN111218640A (en) * | 2019-12-17 | 2020-06-02 | 中国航发哈尔滨东安发动机有限公司 | Method for improving wear resistance of 10CrNi2Mo3Cu2V part after surface carburization |
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| EP0781858A1 (en) * | 1995-12-28 | 1997-07-02 | Dowa Mining Co., Ltd. | Cementation method of metals |
| KR100272191B1 (en) * | 1998-06-12 | 2000-11-15 | 박홍제 | Heat treatment method for rotating compressor roller |
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| CN2241696Y (en) * | 1995-04-20 | 1996-12-04 | 王武华 | Isothermal flatter |
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| CN105986220A (en) * | 2015-01-30 | 2016-10-05 | 重庆文力机械有限公司 | Heat processing method for carburizing and quenching |
| CN105369260A (en) * | 2015-11-19 | 2016-03-02 | 张家港市广大机械锻造有限公司 | Carburizing heat treatment technique for 8620H gear steel |
| CN107675123B (en) * | 2017-10-13 | 2019-02-26 | 重庆派斯克刀具制造股份有限公司 | A kind of high-speed steel carburizing quenching process |
| CN108251609B (en) * | 2018-04-20 | 2019-07-12 | 杭州双江工具制造有限公司 | A kind of saw blade heat treatment process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0781858A1 (en) * | 1995-12-28 | 1997-07-02 | Dowa Mining Co., Ltd. | Cementation method of metals |
| KR100272191B1 (en) * | 1998-06-12 | 2000-11-15 | 박홍제 | Heat treatment method for rotating compressor roller |
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