CN105312372A - Car auxiliary frame and forming method - Google Patents
Car auxiliary frame and forming method Download PDFInfo
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- CN105312372A CN105312372A CN201410379760.8A CN201410379760A CN105312372A CN 105312372 A CN105312372 A CN 105312372A CN 201410379760 A CN201410379760 A CN 201410379760A CN 105312372 A CN105312372 A CN 105312372A
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Abstract
The invention relates to the machining field of car components, particularly to an auxiliary frame and a forming method thereof. The car auxiliary frame is formed by directly molding a uniform-wall-thickness cylindrical pipe and is of one piece. The forming method comprises the following steps: firstly selecting the uniform-thickness cylindrical pipe as a raw material, and then bending the round pipe to obtain an elbow pipe; then pre-molding the elbow pipe, hydraulically molding the pre-molded frame pipe, and finally cutting the end part of the formed frame to obtain a needed component. According to the auxiliary frame and the forming method, one round pipe is sequentially bent, pre-molded and hydraulically-molded to finally obtain the needed auxiliary frame. Compared with the auxiliary frame component manufactured in a traditional stamping welding way, the forming method has advantages of high production efficiency, fewer molds, light component weight, high strength and low comprehensive component cost; while the material cost is reduced, the light-weight requirement of vehicles can be realized, and the product competence can be improved.
Description
Technical field
The present invention relates to auto parts and components manufacture field, particularly relate to a kind of subframe and manufacturing process thereof.
Background technology
Subframe is the major part of automobile chassis, supports, have material impact to the comfortableness of car load and security for engine provides to install.Traditional automobile accessory frame all adopts punch welding mode to produce, and namely the punching parts of multiple sheet is passed through being welded together.Mainly there is the shortcomings such as production process is many, pts wt is large, cost of parts is high in which.Adopt traditional stamping welding method, a general subframe part is welded by more than ten stamping parts usually, and each punching parts needs 2 ~ 4 operations do not waited to produce.In process of production, each operation needs to utilize independently mould to carry out punching press, welds after all parts have all been produced again.Whole production process operation is various, and production efficiency is low, and number of molds is many, and die cost is high.Meanwhile, owing to adopting punching press-welding manner, also need between part and part to preset the region for welded lap, not only waste material, and add pts wt.Adopt welding manner that multiple stamping parts is coupled together, in actual production process, not only efficiency is low, and links together for more than one piece, and subframe bulk strength, rigidity and the fatigue behaviour produced are all poor.
This shows, adopt the subframe part of conventional method processing, there is many deficiencies.Therefore the version of subframe part, method of processing parts all needs to improve, to promote economy and the light weight effect of part.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of automobile accessory frame and manufacturing process, utilize a pipe to enter bend pipe, preformed, hydroforming successively and finally obtain required subframe, there is production efficiency high, number of molds is few, pts wt is light, intensity is high, the advantage that part integrated cost is low, achieves the lightweight demand to vehicle.
The present invention is achieved in that a kind of automobile accessory frame manufacturing process, comprises the following steps:
S1: first choose the cylindrical tube of a single wall thickness as raw material;
S2: according to the shape of automobile accessory frame, utilizes bend pipe mould to bend according to the sweep of setting, obtains bend pipe in bending machine;
S3: preform is carried out to the bend pipe that S2 obtains, bend pipe is put in extrusion die and extrudes, utilize preform press, patrix is descending to be contacted with bend pipe, utilizes the extruding of patrix, and bend pipe is expressed in counterdie die cavity, obtains preformed frame tube;
S4: hydroforming is carried out to the preformed frame tube after preform, namely preformed frame tube is put into hydraulic forming mold, the liquid of high pressure is passed in preformed frame tube, the two ends of pipe utilize sealing punch to seal simultaneously, in forming process, sealing punch inwardly advances along pipe end axis, carries out feed supplement, prevent pipe end cracking in forming process, make preformed frame tube material at the beginning of bulging to required vehicle frame under the effect of highly pressurised liquid;
S5: just cut material end the vehicle frame after hydroforming, obtains final required automobile accessory frame.
Also comprise after described step S5 to final to part clean, the step of oil surface antirust treatment.
In described step S4, whole hydroforming process is divided into 3 stages, is respectively the sealing stage, shaping stage and truing phase; First stage is the sealing stage, does not also deform at sealing stage pipe; Second stage is for being shaped, and in this stage, pipe is except less fillet, and all the other all regions deform under the effect of fluid pressure; Phase III is shaping, and this stage utilizes liquid high pressure to carry out bulging to the fillet of part.
When the perimeter of section perpendicular to tubular axis line of cylindrical tube in step S1 is L, the maximum swelling amount of hydroforming in step S4 is no more than 30%, and namely on final automobile accessory frame axis, the maximum perimeter in each cross section is no more than 1.3L.
In described step S4, in hydroforming process, synchronously go out pilot hole.
In described step S5, cutting adopts laser cutting or machine cuts.
In described step S5, when cutting, synchronous flushing goes out fabrication hole.
This automobile accessory frame is formed by the cylindrical tube straight forming of a single wall thickness, as a whole.
Automobile accessory frame of the present invention and manufacturing process utilize a pipe to enter bend pipe, preformed, hydroforming successively and finally obtain required subframe; Compared with the subframe part of conventional ones welding manner manufacture, have production efficiency high, number of molds is few, and pts wt is light, intensity is high, the advantage that part integrated cost is low; While decreasing material cost, achieve the lightweight demand to vehicle, improve product competitiveness.
Accompanying drawing explanation
Fig. 1 is the cylindrical tube structure schematic diagram of the single wall thickness chosen in the present invention;
Fig. 2 is the bending bend pipe schematic diagram obtained in the present invention;
Fig. 3 is the preformed frame tube schematic diagram that in the present invention, preformed obtains;
Fig. 4 is the part schematic diagram obtained after hydroforming in the present invention;
Fig. 5 is pressure and displacement curve figure.
Detailed description of the invention
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's statement.
Embodiment 1
A kind of automobile accessory frame is formed by the cylindrical tube straight forming of a single wall thickness, as a whole, and its concrete manufacturing process comprises the following steps:
S1: first choose the cylindrical tube of a single wall thickness as shown in Figure 1 as raw material; The length of this cylindrical tube is automobile accessory frame axial length to be processed, increases certain cutting surplus, and this cutting surplus is 100 ~ 150mm;
S2: according to the shape of automobile accessory frame, utilizes bend pipe mould to bend according to the sweep of setting, obtains bend pipe as shown in Figure 2 in bending machine; Bend pipe adopts angle pipe equipment, and according to the sweep of setting, to a kind of process that straight tube bends, all bent angles on what a part all adopt same bending radius;
S3: preform is carried out to the bend pipe that S2 obtains, bend pipe is put in extrusion die and extrudes, utilize preform press, patrix is descending to be contacted with bend pipe, utilize the extruding of patrix, bend pipe is expressed in counterdie die cavity, obtain preformed frame tube as shown in Figure 3; In performing process, consider the resilience of part after preform, in piece pre-forming die design, reserved certain springback compensation amount, prevents the part after preform from putting not feed liquor pressing formation mold cavity;
S4: hydroforming is carried out to the preformed frame tube after preform, namely preformed frame tube is put into hydraulic forming mold, the liquid of high pressure is passed in preformed frame tube, the two ends of pipe utilize sealing punch to seal simultaneously, in forming process, sealing punch inwardly advances along pipe end axis, carries out feed supplement, prevent pipe end cracking in forming process, make preformed frame tube material at the beginning of bulging to required vehicle frame as shown in Figure 4 under the effect of highly pressurised liquid; In the present invention, in order to ensure dimensional accuracy and the positional precision of pilot hole, in hydroforming process, synchronously go out pilot hole, to guarantee welding precision and the quality of follow-up assembly part.
In hydroforming process, first in pipe, be full of liquid, the air in discharge pipe, sealing punch is pushed ahead simultaneously, prevents liquid in pipe from leaking, and then, increases liquid in pipe pressure gradually, starts plastic deformation occurs to pipe.In this process, sealing punch coordinates the rising of liquid in pipe pressure and pushes ahead, and prevents leak of liquid cannot build-up pressure.The pressurization of this process and propelling feed supplement are carried out according to the loading curve of pressure-displacement as shown in Figure 5, prevent from advancing the too fast part that causes wrinkling, also will prevent from advancing not enough appearance in Bulging Process to ftracture.
S5: just cut material end the vehicle frame after hydroforming, obtains final required automobile accessory frame, and in the present embodiment, cutting adopts laser cutting or machine cuts; For some fabrication holes in the rear operation on part, as Electrophoresis paint hole, with the via hole connected, the precision of this some holes and status requirement tolerance are comparatively large, adopt other modes to cut after hydroforming.
S6: to final to part clean, the step of oil surface antirust treatment.
In the present embodiment, for hydraulic forming subframe part, due in hydroforming process, by the effect of internal high pressure liquid, very large frictional force can be produced between pipe and hydraulic forming mold, by the propelling feed supplement of two ends sealing punch, the material of tube end can only flow to from the region close to end, be difficult to flow to position far away, therefore, during hydraulic forming subframe part, part should be positioned at part two ends along the maximum bulging amount in each cross section of axis, and this maximum bulging amount is when the perimeter of section perpendicular to tubular axis line of cylindrical tube in step S1 is L, the maximum swelling amount of hydroforming in step S4 is no more than 30%, namely on final automobile accessory frame axis, the maximum perimeter in each cross section is no more than 1.3L.
Hydroforming is carried out on hydro-forming machine, and the preformed frame tube after preform is put into the hydraulic forming mold be arranged on hydro-forming machine, according to pressure and the displacement curve of Fig. 5 setting, utilizes hydraulic forming mold to form pipe.Whole hydroforming process can be divided into 3 stages, is respectively the sealing stage, shaping stage and truing phase.In the sealing stage, sealing punch pushes ahead S0 distance, and now liquid in pipe pressure is increased to P0 by 0MPa, and this stage pipe does not also deform; Second stage is for being shaped, and end sealing drift advances to S1 by S0, and liquid in pipe pressure rises to P1 by P0, and in this stage, pipe is except less fillet, and all the other all regions deform under the effect of fluid pressure; Phase III is shaping, and liquid in pipe pressure durations increases, and pressure rises to P2 by P1, and end sealing drift advance small distance, prevents end sealing to lose efficacy, and this stage mainly utilizes liquid high pressure to carry out bulging to the fillet of part.
Compared with traditional processing mode, manufacturing process production efficiency of the present invention is higher;
| Conventional ones welds | Manufacturing process of the present invention | |
| Number of parts | 10 ~ 20 parts | 1 part |
| Pts wt | Heavy Weight | Weight saving 20 ~ 30% |
| Number of molds | At least 20 molds | 3 molds |
| Production efficiency | Low | High |
| Welding | Need welding | Do not need welding |
| Cost of parts | High | Low |
| Part strength | Low | High |
Claims (8)
1. an automobile accessory frame manufacturing process, is characterized in that, comprises the following steps:
S1: first choose the cylindrical tube of a single wall thickness as raw material;
S2: according to the shape of automobile accessory frame, utilizes bend pipe mould to bend according to the sweep of setting, obtains bend pipe in bending machine;
S3: preform is carried out to the bend pipe that S2 obtains, bend pipe is put in extrusion die and extrudes, utilize preform press, patrix is descending to be contacted with bend pipe, utilizes the extruding of patrix, and bend pipe is expressed in counterdie die cavity, obtains preformed frame tube;
S4: hydroforming is carried out to the preformed frame tube after preform, namely preformed frame tube is put into hydraulic forming mold, the liquid of high pressure is passed in preformed frame tube, the two ends of pipe utilize sealing punch to seal simultaneously, in forming process, sealing punch inwardly advances along pipe end axis, carries out feed supplement, prevent pipe end cracking in forming process, make preformed frame tube material at the beginning of bulging to required vehicle frame under the effect of highly pressurised liquid;
S5: just cut material end the vehicle frame after hydroforming, obtains final required automobile accessory frame.
2. automobile accessory frame manufacturing process as claimed in claim 1, is characterized in that: also comprise after described step S5 to final to part clean, the step of oil surface antirust treatment.
3. automobile accessory frame manufacturing process as claimed in claim 1, it is characterized in that: in described step S4, whole hydroforming process is divided into 3 stages, is respectively the sealing stage, shaping stage and truing phase; First stage is the sealing stage, does not also deform at sealing stage pipe; Second stage is for being shaped, and in this stage, pipe is except less fillet, and all the other all regions deform under the effect of fluid pressure; Phase III is shaping, and this stage utilizes liquid high pressure to carry out bulging to the fillet of part.
4. the automobile accessory frame manufacturing process as described in a claim any in claim 1 ~ 3, it is characterized in that: when the perimeter of section perpendicular to tubular axis line of cylindrical tube in step S1 is L, the maximum swelling amount of hydroforming in step S4 is no more than 30%, and namely on final automobile accessory frame axis, the maximum perimeter in each cross section is no more than 1.3L.
5. automobile accessory frame manufacturing process as claimed in claim 4, is characterized in that: in described step S4, in hydroforming process, synchronously go out pilot hole.
6. automobile accessory frame manufacturing process as claimed in claim 4, is characterized in that: in described step S5, and cutting adopts laser cutting or machine cuts.
7. automobile accessory frame manufacturing process as claimed in claim 4, is characterized in that: in described step S5, and when cutting, synchronous flushing goes out fabrication hole.
8. an automobile accessory frame, is characterized in that: this automobile accessory frame is formed by the cylindrical tube straight forming of a single wall thickness, as a whole.
Priority Applications (1)
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| CN201410379760.8A CN105312372A (en) | 2014-08-05 | 2014-08-05 | Car auxiliary frame and forming method |
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| CN201410379760.8A CN105312372A (en) | 2014-08-05 | 2014-08-05 | Car auxiliary frame and forming method |
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| CN105312372A true CN105312372A (en) | 2016-02-10 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105583252A (en) * | 2016-03-07 | 2016-05-18 | 北京航空航天大学 | Hydroforming method of axis continuous bending special-shaped pipe fitting |
| CN107159771A (en) * | 2017-07-20 | 2017-09-15 | 江苏省常熟环通实业有限公司 | A kind of internal high pressure forming processing method of odd-shaped cross section hollow steel pipe |
| CN107398669A (en) * | 2017-08-30 | 2017-11-28 | 福建龙马环卫装备股份有限公司 | A kind of welding tooling for dustbin back skeleton |
| CN107717349A (en) * | 2017-10-13 | 2018-02-23 | 芜湖禾田汽车工业有限公司 | The preparation method of subframe |
| CN107755512A (en) * | 2016-08-20 | 2018-03-06 | 无锡明豪汽车轻量化技术应用有限公司 | A kind of tubular member moulding process |
| CN108655249A (en) * | 2017-03-30 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of hydraulic expanding-forming pipe and its manufacturing process that local wall thickness thickens |
| CN110227908A (en) * | 2019-06-14 | 2019-09-13 | 济南实达紧固件有限公司 | A kind of J-type bolt production technology |
| CN111957778A (en) * | 2020-08-20 | 2020-11-20 | 吉林盛业汽车部件有限公司 | Bent pipe forming method |
| CN114472666A (en) * | 2020-11-13 | 2022-05-13 | 上海宝钢高新技术零部件有限公司 | Forming device and method for tubular hydroforming front fender support |
| CN115009360A (en) * | 2022-06-28 | 2022-09-06 | 广东玛西尔电动科技有限公司 | Novel technological frame crossbeam of sightseeing vehicle |
| CN115647203A (en) * | 2022-11-14 | 2023-01-31 | 海宁正轩汽车轻量化零部件有限公司 | Manufacturing process of automobile beam |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105583252A (en) * | 2016-03-07 | 2016-05-18 | 北京航空航天大学 | Hydroforming method of axis continuous bending special-shaped pipe fitting |
| CN107755512A (en) * | 2016-08-20 | 2018-03-06 | 无锡明豪汽车轻量化技术应用有限公司 | A kind of tubular member moulding process |
| CN108655249A (en) * | 2017-03-30 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of hydraulic expanding-forming pipe and its manufacturing process that local wall thickness thickens |
| CN107159771A (en) * | 2017-07-20 | 2017-09-15 | 江苏省常熟环通实业有限公司 | A kind of internal high pressure forming processing method of odd-shaped cross section hollow steel pipe |
| CN107398669B (en) * | 2017-08-30 | 2023-08-25 | 福龙马集团股份有限公司 | Welding tool for rear framework of dustbin |
| CN107398669A (en) * | 2017-08-30 | 2017-11-28 | 福建龙马环卫装备股份有限公司 | A kind of welding tooling for dustbin back skeleton |
| CN107717349A (en) * | 2017-10-13 | 2018-02-23 | 芜湖禾田汽车工业有限公司 | The preparation method of subframe |
| CN110227908A (en) * | 2019-06-14 | 2019-09-13 | 济南实达紧固件有限公司 | A kind of J-type bolt production technology |
| CN111957778B (en) * | 2020-08-20 | 2023-02-21 | 吉林盛业汽车部件有限公司 | Bent pipe forming method |
| CN111957778A (en) * | 2020-08-20 | 2020-11-20 | 吉林盛业汽车部件有限公司 | Bent pipe forming method |
| CN114472666A (en) * | 2020-11-13 | 2022-05-13 | 上海宝钢高新技术零部件有限公司 | Forming device and method for tubular hydroforming front fender support |
| CN115009360A (en) * | 2022-06-28 | 2022-09-06 | 广东玛西尔电动科技有限公司 | Novel technological frame crossbeam of sightseeing vehicle |
| CN115647203A (en) * | 2022-11-14 | 2023-01-31 | 海宁正轩汽车轻量化零部件有限公司 | Manufacturing process of automobile beam |
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Application publication date: 20160210 |
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