CN109266963B - Production process of large steel sheet material for clutch framework of commercial vehicle - Google Patents
Production process of large steel sheet material for clutch framework of commercial vehicle Download PDFInfo
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- CN109266963B CN109266963B CN201811173576.2A CN201811173576A CN109266963B CN 109266963 B CN109266963 B CN 109266963B CN 201811173576 A CN201811173576 A CN 201811173576A CN 109266963 B CN109266963 B CN 109266963B
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- steel sheet
- sheet material
- commercial vehicle
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
Abstract
The invention discloses a production process of a large steel sheet material of a clutch framework of a commercial vehicle, which comprises the following steps: step 1) selecting a blank, and removing an oxide layer on the surface of the blank; step 2) annealing heat treatment is carried out on the blank, firstly, water and oil stains on the surface of the steel strip are removed through heating, the vacuum degree in the furnace is ensured, and then protective gas is filled; then heating to a recrystallization temperature region and preserving heat for heat treatment to recover the grain size; finally, cooling the blank through a rapid cooling process to obtain a heat-treated material; and 3) carrying out cold rolling on the heat-treated material to obtain the large sheet steel material of the clutch framework. The invention can remove or reduce most of the working procedures, avoid the defects of the production at the present stage, simultaneously liberate a large amount of labor force and greatly reduce the production cost.
Description
Technical Field
The invention relates to the technical field of metal heat treatment and pressure processing, in particular to a production process of a large steel sheet material of a clutch framework of a commercial vehicle.
Background
The large steel sheet material of the clutch framework of the commercial vehicle is produced by firstly stamping and forming a foreign imported C75S material and then quenching and tempering the material, and the production process is used for achieving the heat resistance of parts in the commercial vehicle during high-temperature operation.
The process is a normalized manufacturing mode in the automobile industry, but parts are complex and often deform after heat treatment, so that the final flatness of the parts cannot meet the use requirement, abnormal sound can be generated in the operation process of a commercial vehicle, and the parts are easy to wear and break.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a production process of a large steel sheet material of a clutch framework of a commercial vehicle, which can remove or reduce most of working procedures, avoid the defects of production at the present stage, simultaneously liberate a large amount of labor force and greatly reduce the production cost.
In order to solve the technical problem, the invention provides a production process of a large steel sheet material for a clutch framework of a commercial vehicle, which comprises the following steps:
step 1) selecting a blank, and removing an oxide layer on the surface of the blank;
step 2) annealing heat treatment is carried out on the blank, firstly, water and oil stains on the surface of the steel strip are removed by heating, the vacuum degree in the furnace is ensured, and protective gas is filled; then heating to a recrystallization temperature region and preserving heat for heat treatment to recover the grain size; finally, cooling the blank through a rapid cooling process to obtain a heat-treated material;
and 3) carrying out cold rolling on the heat-treated material to obtain the large sheet steel material of the clutch framework.
Further, the blank is a 65Mn cold-rolled steel strip, and the blank contains 0.62-0.7% of C, 0.17-0.37% of Si, 0.9-1.2% of Mn, less than or equal to 0.035% of S, less than or equal to 0.035% of P, less than or equal to 0.25% of Cu and less than or equal to 0.25% of Ni.
Further, in the step 2), the blank is heated to 270-; then heating to 580-620 ℃ and preserving the heat for 12 hours; finally, the temperature is reduced to 480-550 ℃, and then the outer cover is hung, and the temperature reduction speed of 50 ℃ per hour is ensured by using a rapid cooling process.
Furthermore, after the outer cover is hung, when the temperature is reduced to 270-290 ℃, cooling is accelerated by water cooling.
Further, the cold rolling is carried out for three times of rolling.
Further, the hardness of the blank is HRC 20-30.
Further, the grain size of the blank is not less than 7.0 grade.
Further, the decarburized layer of the blank is less than or equal to 0.03 mm.
The invention has the beneficial effects that:
the cold rolling process of the cold rolled steel strip adopts the raw materials to directly perform recrystallization annealing without rough rolling, the annealing temperature is set near the hot rolling curling temperature, the internal energy of the steel is prevented from being increased due to cold rolling deformation, the internal structure of the steel is not changed under the condition of heat treatment, the original state is maintained, the nonuniformity of the head, the middle and the tail caused by air cooling of a hot rolled coil is only improved, the hardness is improved through direct forming by a compression ratio of 20 percent, the produced cold rolled material keeps the hot rolled structure, the hardness of the produced cold rolled material is not reduced through a temperature resistance test under the condition, the stamping performance of the material is ensured, and the high-temperature working condition of stamped parts used in commercial vehicles is also met.
Drawings
FIG. 1 is a schematic view of the heat treatment process of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
The embodiment of the production process of the large steel sheet material for the clutch framework of the commercial vehicle adopts a 65Mn cold-rolled steel strip as a blank material for preparation, wherein the blank material contains 0.62-0.7% of C, 0.17-0.37% of Si, 0.9-1.2% of Mn, less than or equal to 0.035% of S, less than or equal to 0.035% of P, less than or equal to 0.25% of Cu and less than or equal to 0.25% of Ni. Wherein the blank is selected according to the following standard:
TABLE 1
TABLE 2
Selecting materials and then carrying out test selection of a preparation process, and taking blanks with three specifications, wherein the specifications of the blanks are 5.5 x 1250mm x C respectively; 3.5 x 1250mm C; 2.5 x 1250mm C; removing the surface oxide layer by acid washing, and then splitting;
the blank hot-rolled steel strips with two specifications are produced to the following specifications through an AGC 4-roller cold rolling unit; another 2.5 x 1250 x C kept the raw material thickness unchanged without cold rolling:
5.5-4.7-4.1-3.6-3.1-2.7-2.5mm (6 rolling passes to 2.5mm thickness);
② 3.5-3.0-2.7-2.5mm (3 rolling passes to 2.5mm thickness);
③ 2.5mm, keeping the thickness of the raw material unchanged;
subsequently, annealing heat treatment is performed on the rolled first and second materials and the non-rolled third material, and as shown in fig. 1, the heat treatment steps are as follows:
1) heating to 280 ℃ and preserving heat for 2 hours, removing water and oil stains on the surface of the steel strip, ensuring the vacuum degree in the furnace, and then filling protective gas: hydrogen to ensure the concentration and purity of the protective gas in the furnace and prevent the formation of surface defects caused by the oxidation of the surface of the steel strip in the annealing heat treatment process;
2) heating to 600 deg.C, maintaining for 12 hr, and performing heat treatment in recrystallization temperature region to recover grain size, maintain the structure in raw material state, and prevent pearlite lamella from dispersing to form spherical shape;
3) after the temperature is reduced to 500 ℃, the outer cover is hung, and the rapid cooling process is used in the section to ensure the cooling speed of 50 ℃ per hour, avoid the transformation in the cooling process of the tissue and ensure the original tissue and performance;
4) cooling to 290 ℃, wherein water cooling is to spray water on the surface of the inner cover to accelerate cooling, and discharging from the furnace at 70 ℃, so that the structure has no phase change, the production cost is saved, and the heat treatment rhythm is accelerated;
finally, the first, second and third strips after heat treatment are sequentially cold-rolled to the following thickness by three times:
2.5-2.3-2.1-2.0mm
namely, 3 processes are used for simultaneously producing the finished product with the thickness of 2.0 mm;
the temperature resistance test is carried out on the products produced by 3 different processes, and the products are placed in a test furnace to carry out the test hardness change after the products are subjected to the heat preservation at 550 ℃ for 5 hours, wherein the data are as follows:
through analysis, the hardness of the third process is kept unchanged after a temperature resistance test, and the characteristics of the final finished parts are met, so that the first production process is abandoned, and the third process is locked for production control.
In one embodiment, the heat treatment is performed by heating the blank to 270-290 ℃; then heating to 580-620 ℃; finally, the temperature is reduced to 480-550 ℃, and then the outer cover is hung, and the temperature reduction speed of 50 ℃ per hour is ensured by using a rapid cooling process; and after the outer cover is hung, when the temperature is reduced to between 270 ℃ and 290 ℃, the cooling is accelerated by water cooling.
The production process of the invention adopts the raw materials to directly carry out recrystallization annealing without rough rolling, sets the annealing temperature near the hot rolling curling temperature, avoids increasing the internal energy of steel due to cold rolling deformation, leads the internal structure of the steel not to be transformed under the condition of heat treatment, keeps the original state, only improves the nonuniformity of head, middle and tail caused by air cooling of a hot rolled coil, directly forms the steel by a compression ratio of 20 percent, improves the hardness, and leads the produced cold rolled material to keep the hot rolled structure, and passes a temperature resistance test under the condition, the hardness of the cold rolled material is not reduced, thereby ensuring the stamping performance of the material and meeting the high temperature working condition of the stamped parts used in commercial vehicles.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. A production process of a large steel sheet material for a clutch framework of a commercial vehicle is characterized by comprising the following steps: step 1: selecting a blank, and removing an oxide layer on the surface of the blank; step 2: annealing heat treatment is carried out on the blank, the blank is heated to 270-plus 290 ℃ and is kept warm for 2 hours, the water and oil stains on the surface of the steel strip are removed by heating, the vacuum degree in the furnace is ensured, and protective gas is filled: hydrogen, which ensures the concentration and purity of protective gas in the furnace and prevents the surface of the steel strip from being oxidized to cause the formation of surface defects in the annealing heat treatment process; then heating to 580-620 ℃ and preserving heat for 12 hours, heating to a recrystallization temperature region and preserving heat for heat treatment to recover the grain size; finally, cooling to 480-550 ℃, then hanging the outer cover, ensuring the cooling speed at 50 ℃/h by using a rapid cooling process, and cooling the blank by using the rapid cooling process to obtain a heat-treated material; and step 3: and (4) cold rolling the heat-treated material to obtain the clutch framework large steel sheet material.
2. The production process of the large steel sheet material for the clutch framework of the commercial vehicle as claimed in claim 1, wherein the blank is a 65Mn cold-rolled steel strip, and the blank contains 0.62-0.7% of C, 0.17-0.37% of Si, 0.9-1.2% of Mn, less than or equal to 0.035% of S, less than or equal to 0.035% of P, less than or equal to 0.25% of Cu and less than or equal to 0.25% of Ni.
3. The production process of the large steel sheet material for the clutch framework of the commercial vehicle as claimed in claim 1, wherein after the outer cover is hung, when the temperature is reduced to 270-290 ℃, the cooling is accelerated by water cooling.
4. The production process of the commercial vehicle clutch framework large steel sheet material as claimed in claim 1, wherein the cold rolling is carried out for three times.
5. The production process of the commercial vehicle clutch framework large steel sheet material as claimed in claim 1, wherein the hardness of the blank is HRC 20-30.
6. The production process of the large steel sheet material for the clutch framework of the commercial vehicle as claimed in claim 1, wherein the grain size of the blank is not less than 7.0 grade.
7. The production process of the large steel sheet material for the clutch framework of the commercial vehicle as claimed in claim 1, wherein the decarburized layer of the blank is less than or equal to 0.03 mm.
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| CN201811173576.2A CN109266963B (en) | 2018-10-09 | 2018-10-09 | Production process of large steel sheet material for clutch framework of commercial vehicle |
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| CN201811173576.2A CN109266963B (en) | 2018-10-09 | 2018-10-09 | Production process of large steel sheet material for clutch framework of commercial vehicle |
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| CN109266963B true CN109266963B (en) | 2020-09-22 |
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| CN105401073B (en) * | 2015-12-30 | 2017-05-24 | 苏州翔楼新材料股份有限公司 | Heat treatment technology of alloy spring cold-rolled steel strip 51CrV4 of automobile clutch diaphragm |
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