CN109648256B - Manufacturing process of high-strength hollow stabilizer bar - Google Patents
Manufacturing process of high-strength hollow stabilizer bar Download PDFInfo
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- CN109648256B CN109648256B CN201811441964.4A CN201811441964A CN109648256B CN 109648256 B CN109648256 B CN 109648256B CN 201811441964 A CN201811441964 A CN 201811441964A CN 109648256 B CN109648256 B CN 109648256B
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- stabilizer bar
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
- B60G21/055—Stabiliser bars
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses a manufacturing process of a high-strength hollow stabilizer bar, which comprises the following steps: 1) blanking: blanking the hollow metal pipe according to the designed length; 2) performing carburizing treatment on the surface of the steel pipe; 3) carrying out cold bending forming by using a numerical control cold bending machine; 4) under the protection of inert gas, heating the workpiece in a quenching furnace and then performing oil quenching; 5) under the protection of inert gas, heating the workpiece in a tempering furnace and then preserving heat; 6) locally correcting a deformed part of the semi-finished product of the stabilizer bar in the quenching process; 7) shot peening strengthening is carried out on the inner wall of the hollow stabilizer bar; 8) welding the stabilizer bar and the ball head by adopting a friction welding process; 9) performing shot blasting strengthening treatment on the outer wall of the hollow stabilizer bar; 10) firstly, phosphorizing the surface of the stabilizer bar, then spraying powder, and heating and curing. The manufacturing process of the high-strength hollow stabilizer bar can reduce the weight of the stabilizer bar, improve the tensile strength and prolong the fatigue life.
Description
Technical Field
The invention relates to the field of mechanical manufacturing processes, in particular to a manufacturing process of a high-strength hollow stabilizer bar.
Background
The stabilizing rod is an important part of an automobile suspension system, and has the functions of preventing the automobile from turning over when the automobile turns or the left and right wheels are subjected to different loads, improving the operation stability of the automobile and improving the riding comfort of the automobile. In order to adapt to the trend of light weight development of automobiles, the stabilizer bar is also changed from a traditional solid structure to a hollow structure, the weight reduction effect is obvious, and the weight reduction proportion can reach 30-45%.
Compare solid stabilizer bar, hollow stabilizer bar appears inner wall heat treatment decarbonization easily in manufacturing process and leads to the intensity to descend, defects such as inner wall cold-bending strain, R angle fold to and the working stress level at the cold-bending changeover portion is higher, lead to fatigue crack to sprout and the expansion makes the part inefficacy destroy scheduling problem from the inner wall easily, consequently how to select suitable manufacturing process in order to improve hollow stabilizer bar's whole life-span is the problem that needs the solution at present urgently.
Disclosure of Invention
The invention aims to provide a manufacturing process of a high-strength hollow stabilizer bar, which is used for solving the problems that the strength of the conventional hollow stabilizer bar is reduced due to the fact that the inner wall is subjected to heat treatment and decarbonization in the manufacturing process, the inner wall is subjected to cold bending and pulling, R-angle wrinkles and other defects easily occur, the working stress level of a cold bending transition section is high, fatigue cracks are easily generated from the inner wall and are expanded, and parts are damaged due to failure.
The technical scheme for realizing the purpose of the invention is as follows:
a manufacturing process of a high-strength hollow stabilizer bar comprises the following steps:
1) blanking: blanking the hollow metal tube raw material on a circular sawing machine according to the designed length;
2) carburizing: performing carburizing treatment on the surface of a raw material steel pipe, and controlling the carburizing temperature, the thickness of a carburized layer and the carburizing uniformity;
3) cold-roll forming: carrying out cold bending forming by using a numerical control cold bending machine, wherein in the process, a core rod is used for supporting in the steel pipe so as to ensure that the R angle is excessively smooth;
4) quenching: under the protection of inert gas, heating the workpiece in a quenching furnace to a set temperature, and then carrying out oil quenching;
5) tempering: under the protection of inert gas, heating the workpiece in a tempering furnace to a set temperature and then preserving heat;
6) cold calibration: local correction is carried out on a deformed part of the semi-finished product of the stabilizer bar in the quenching process by adopting hydraulic equipment;
7) inner wall shot blasting: shot blasting strengthening is carried out on the inner wall of the hollow stabilizer bar by using high-pressure water to drive metal shot;
8) friction welding: adopting a friction welding process to weld and connect the stabilizer bar with the strengthened inner wall and the machined ball head;
9) shot blasting on the outer wall: a hanging cage type shot blasting machine is used for driving metal shots to perform shot blasting strengthening treatment on the outer wall of the hollow stabilizer bar by utilizing a rotating impeller;
10) surface coating protection: firstly, carrying out surface phosphorization on the stabilizer bar to keep the surface of the stabilizer bar clean; then spraying powder and heating for curing.
In the scheme, in the step 2, the surface carburization temperature is 900-950 ℃, the thickness of the carburized layer is 0.8-1.2 mm, and the tensile strength after carburization exceeds 1000 MPa.
In the scheme, in the step 3, during cold roll forming, the inner wall of the steel pipe is supported by the flexible core rod, so that R angle corrugation cracking is avoided, and the R angle radius tolerance is controlled within +/-2 mm.
In the scheme, in the step 4, in the quenching process, the workpiece is heated to 920 +/-20 ℃, and then the workpiece is placed into a cooling liquid tank for quenching, wherein the quenching cooling time is 180 s.
In the scheme, in the step 5, in the tempering process, the workpiece is heated to 450 +/-20 ℃, the tempering time is 100-.
In the scheme, in the step 7, after the inner wall is subjected to shot blasting, the surface layer pressure stress of the inner wall of the workpiece is more than or equal to 400 Mpa.
In the scheme, in the step 8, the strength of the welded joint is not lower than that of the base metal, and the phase angle of the ball head after welding is less than or equal to +/-0.5 ℃.
In the scheme, in the step 9, after the outer wall is subjected to shot blasting, the surface layer pressure stress of the outer wall of the workpiece is more than or equal to 800 MPa.
The invention has the following beneficial effects: the manufacturing process of the high-strength hollow stabilizer bar can improve the tensile strength and the fatigue life of the stabilizer bar while reducing the weight of the stabilizer bar. The stress level of the hollow stabilizer bar is higher than 1000MPa, and the fatigue life of the stabilizer bar is over 20 ten thousand times (the surface lamination stress of the inner wall is more than or equal to 400MPa, and the surface lamination stress of the outer wall is more than or equal to 800 MPa).
Drawings
Fig. 1 is a schematic view illustrating a process for manufacturing a high-strength hollow stabilizer bar according to the present invention;
fig. 2 is a schematic structural view of a hollow stabilizer bar according to the present invention.
Detailed Description
In order to make the technical problems, solutions and achievement effects of the invention clearer, the following detailed description is given with reference to the accompanying drawings, all examples are only partial and not all examples of the invention, and other examples of non-inventive achievements of the skilled person belong to the protection scope of the invention.
The following further describes the embodiments of the present invention with reference to fig. 1 and 2:
referring to fig. 1, a process for manufacturing a high-strength hollow stabilizer bar according to the present invention comprises: blanking → surface carburization → cold bending forming → quenching → tempering → cold correction → inner wall shot blasting → friction welding → outer wall shot blasting → coating. Fig. 2 is a schematic structural diagram of a finished high-strength hollow stabilizer bar manufactured by the manufacturing process of the present invention.
The manufacturing process of the high-strength hollow stabilizer bar comprises the following steps:
1) blanking: blanking a hollow metal steel pipe by using a circular saw according to the designed length, wherein the hollow metal steel pipe is made of 28Mn6, 26MnB5 or 34MnB5 and the like, and the surface of the material has no defects of scratch corrosion and the like;
2) surface carburizing: the carburizing temperature is 900-950 ℃, the thickness of the carburized layer is 0.8-1.2 mm, and the maximum tensile strength can reach 1900MPa after carburization by taking 34MnB5 as an example;
3) cold-roll forming: cold-bending the pipe material to a designed size by adopting numerical control cold-bending forming equipment, wherein a flexible core rod is arranged on the inner wall of the pipe for supporting during cold-bending forming, the R-angle fold is prevented from cracking, and the radius tolerance of the R angle is controlled within +/-2 mm;
4) quenching: in order to prevent the surface layer of the steel pipe from being decarburized, heating the workpiece to 920 +/-20 ℃ in an inert gas protection quenching furnace, placing the workpiece on a clamp after heating, and putting the workpiece into a cooling liquid tank for quenching, wherein the quenching cooling time is 180 s;
5) tempering: in order to improve the toughness of the material, in a nitrogen or argon protective tempering furnace, the tempering temperature is heated to 450 +/-20 ℃, the temperature is kept for 100-plus-one 120min, and the thickness of the inner wall decarburized layer after heat treatment is less than 20 mu m;
6) cold calibration: the deformed part of the semi-finished product of the stabilizer bar is locally corrected by adopting hydraulic equipment in the quenching process, the dimensional precision of the opening is less than or equal to +/-1 mm, and the planeness is less than or equal to +/-0.5 mm;
7) inner wall shot blasting: high-pressure water is used for driving shot, the shot speed is more than 200m/s, the shot is respectively extended into the hollow stabilizer bar from two ends to carry out shot blasting strengthening on the inner wall, the shot blasting coverage rate is more than 98 percent, the shot blasting strength is 0.25mmA-0.45mmA, and the residual compressive stress of the surface layer of the inner wall after shot blasting is more than or equal to 400 MPa;
8) friction welding: the ball head of a part of products has larger volume and can not be processed in a way of end flattening forging, so a friction welding process is adopted to weld and connect the stabilizer bar with the strengthened inner wall and the forged ball head which is machined, the strength of the welded joint is not lower than that of the base material, and the phase angle of the ball head after welding is less than or equal to +/-0.5 ℃;
9) shot blasting on the outer wall: carrying out shot blasting reinforcement on the surface of the stabilizer bar by using a hanging cage type shot blasting device, wherein the coverage rate is more than 98%, the shot blasting strength is 0.3mmA-0.6mmA, and the residual compressive stress of the surface layer of the inner wall after shot blasting is more than or equal to 800 MPa;
10) coating protection: the surface phosphating is carried out on the stabilizer bar firstly, the surface of the stabilizer bar is kept clean, then powder spraying is carried out, and the surface is thermally cured after the powder spraying.
The manufacturing process of the high-strength hollow stabilizer bar can improve the tensile strength and the fatigue life of the stabilizer bar while reducing the weight of the stabilizer bar, and the strength of the stabilizer bar is equivalent to that of a solid stabilizer bar. The stress level of the hollow stabilizer bar is higher than 1000MPa, and the fatigue life of the stabilizer bar is over 20 ten thousand times (the surface lamination stress of the inner wall is more than or equal to 400MPa, and the surface lamination stress of the outer wall is more than or equal to 800 MPa).
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. A manufacturing process of a high-strength hollow stabilizer bar is characterized by comprising the following steps: which comprises the following steps:
1) blanking: blanking the hollow metal tube raw material on a circular sawing machine according to the designed length;
2) carburizing: performing carburizing treatment on the surface of a raw material steel pipe, and controlling the carburizing temperature, the thickness of a carburized layer and the carburizing uniformity;
3) cold-roll forming: carrying out cold bending forming by using a numerical control cold bending machine, wherein in the process, a core rod is used for supporting in the steel pipe so as to ensure smooth transition of an R angle;
4) quenching: under the protection of inert gas, heating the workpiece in a quenching furnace to a set temperature, and then carrying out oil quenching;
5) tempering: under the protection of inert gas, heating the workpiece in a tempering furnace to a set temperature and then preserving heat;
6) cold calibration: local correction is carried out on a deformed part of the semi-finished product of the stabilizer bar in the quenching process by adopting hydraulic equipment;
7) inner wall shot blasting: shot blasting strengthening is carried out on the inner wall of the hollow stabilizer bar by using high-pressure water to drive metal shot;
8) friction welding: adopting a friction welding process to weld and connect the stabilizer bar with the strengthened inner wall and the machined ball head;
9) shot blasting on the outer wall: a hanging cage type shot blasting machine is used for driving metal shots to perform shot blasting strengthening treatment on the outer wall of the hollow stabilizer bar by utilizing a rotating impeller;
10) surface coating protection: firstly, carrying out surface phosphorization on the stabilizer bar to keep the surface of the stabilizer bar clean; then spraying powder, heating and curing;
in the step 2), the surface carburization temperature is 900-950 ℃, the thickness of the carburized layer is 0.8-1.2 mm, and the tensile strength after carburization exceeds 1000 MPa;
in the step 3), during cold roll forming, the inner wall of the steel pipe is supported by the flexible core rod, so that the R-angle fold is prevented from cracking, and the tolerance of the R-angle radius is controlled within +/-2 mm.
2. A process for manufacturing a high-strength hollow stabilizer bar according to claim 1, wherein: in the step 4), in the quenching process, the workpiece is heated to 920 +/-20 ℃, and then the workpiece is placed into a cooling liquid tank for quenching, wherein the quenching cooling time is 180 s.
3. A process for manufacturing a high-strength hollow stabilizer bar according to claim 1, wherein: in the step 5), in the tempering process, the workpiece is heated to 450 +/-20 ℃, the tempering time is 100-.
4. A process for manufacturing a high-strength hollow stabilizer bar according to claim 1, wherein: and 7), after the inner wall is subjected to shot blasting treatment, the surface layer compressive stress of the inner wall of the workpiece is more than or equal to 400 Mpa.
5. A process for manufacturing a high-strength hollow stabilizer bar according to claim 1, wherein: in the step 8), the strength of the welded joint is not lower than that of the base metal, and the phase angle after ball head welding is less than or equal to +/-0.5 ℃.
6. A process for manufacturing a high-strength hollow stabilizer bar according to claim 1, wherein: and 9), after the outer wall is subjected to shot blasting treatment, the surface compressive stress of the outer wall of the workpiece is more than or equal to 800 MPa.
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| CN109648256B true CN109648256B (en) | 2020-09-18 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110038913A (en) * | 2019-04-26 | 2019-07-23 | 张家港保税区亚鑫精密制管有限公司 | Hollow stabilizer rod of automobile metal pipe processing technique |
| CN110842083B (en) * | 2019-11-18 | 2022-04-12 | 爱驰汽车有限公司 | Processing equipment for strengthening inner wall of hollow rod and hollow rod strengthening processing method |
| CN110802378B (en) * | 2019-11-29 | 2021-08-24 | 安庆汇通汽车部件股份有限公司 | Production process of hollow stabilizer bar |
| CN113070821A (en) * | 2021-04-30 | 2021-07-06 | 广州华德汽车弹簧有限公司 | Method for prolonging fatigue life of hollow stabilizer bar product |
| CN115572894B (en) * | 2022-09-08 | 2023-06-09 | 衢州垣发机械有限公司 | Inner tube of steam friction damper and preparation process thereof |
Citations (3)
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|---|---|---|---|---|
| CN102189910A (en) * | 2010-03-19 | 2011-09-21 | 上海中国弹簧制造有限公司 | Manufacturing process of hollow stabilizer rod of automobile |
| CN105798540A (en) * | 2014-12-30 | 2016-07-27 | 上海中国弹簧制造有限公司 | Hollow stabilizer bar assembly manufacturing technique based on integral sulfuration |
| CN106475740A (en) * | 2015-08-28 | 2017-03-08 | 上海中国弹簧制造有限公司 | A kind of manufacturing process of heavily stressed hollow stabilizing rod |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189910A (en) * | 2010-03-19 | 2011-09-21 | 上海中国弹簧制造有限公司 | Manufacturing process of hollow stabilizer rod of automobile |
| CN105798540A (en) * | 2014-12-30 | 2016-07-27 | 上海中国弹簧制造有限公司 | Hollow stabilizer bar assembly manufacturing technique based on integral sulfuration |
| CN106475740A (en) * | 2015-08-28 | 2017-03-08 | 上海中国弹簧制造有限公司 | A kind of manufacturing process of heavily stressed hollow stabilizing rod |
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Denomination of invention: Manufacturing Technology of a High Strength Hollow Stabilizer Bar Effective date of registration: 20221118 Granted publication date: 20200918 Pledgee: Jiangsu Yizheng Rural Commercial Bank Co.,Ltd. Xinji Sub branch Pledgor: YANGZHOU DONGSHENG AUTOMOBILE PARTS LIMITED BY SHARE Ltd. Registration number: Y2022980022453 |