CN102092259B - Method for manufacturing variable-cross-section vehicle trailing arm member - Google Patents
Method for manufacturing variable-cross-section vehicle trailing arm member Download PDFInfo
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Abstract
The invention discloses a method for manufacturing a variable-cross-section vehicle trailing arm member, comprising the following steps of: lofting and blanking: selecting a steel plate with set thickness and blanking, wherein the rolled extension direction of the blanked blank is consistent with the length direction of the variable-cross-section vehicle trailing arm member to be processed, and the blank is provided with a C-shaped axis; (2) pre-bending; (3) bending to form a U shape; (4) trimming; (5) pre-crimping: placing the trimmed blank into a pre-crimping die in a mode that the convex surface of the blank faces downwards, primarily crimping and forming on a press machine to obtain a pre-crimped piece; (6) crimping for forming: placing the pre-crimped piece into a forming crimping die in a mode that the convex surface of the blank faces downwards, primarily crimping and forming on the press machine to obtain a crimped piece; (7) reshaping: carrying out shaft sleeve end reshaping and hub end reshaping on the crimped piece in sequence on the press machine; (8) forming: placing the reshaped piece into a standard die cavity to complete final forming; and (9) welding an indent crimped seam formed through crimping and carrying out postprocessing to obtain the variable-cross-section vehicle trailing arm member. The method has the advantages of not only simplifying a forming process but also guaranteeing the manufacturing precision of the member and effectively saving the cost.
Description
Technical field
The present invention relates to the trailing arm on the vehicle twisted beam rear axle, especially a kind of method for making of auto trailing-arm component with variable cross-section.
Background technology
Car beam trailing arm is connecting bushing, turn round the important foundation member that the members such as beam, Shock absorber and wheel hub stay bearing plate consist of vehicle rear axles.
Auto trailing-arm component with variable cross-section is a hollow pipe fitting, described member comprises the sleeve end that is connected with axle sleeve, the hub end that is connected with the wheel hub adapter plate, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, and the axis of described trailing arm component of vehicle is continuous curve.
Described auto trailing-arm component with variable cross-section method for making relates to a kind of formation of hollow weld assembly, the sleeve end of member and the formation of hub end, and on the above auto trailing-arm component with variable cross-section of member several measure-alike or not identical, round or non-circles be used for install or the making of the through hole of other purposes.
The method for making of described auto trailing-arm component with variable cross-section refers to this trailing arm component from blanking until structure manufacture is finished required whole technological processes.Described auto trailing-arm component with variable cross-section generally has two kinds of manufacturing process at present, when adopting traditional process to make, generally needs half sheet of first punching press more than 2 or 2, is welded into integral body again.Need multi-step process, many, the follow-up welding requirements of work step are high, and are difficult to satisfy the coherence request of member.Another is to adopt hollow circular-tube through the method for making of internal high pressure forming, its basic craft course is to make blank with isometrical tubing, apply superhigh pressure liquid by tubing inside, and in course of exerting pressure, pass through the material of member along axis direction replenished, making pipe is required workpiece at the mold cavity internal shaping.Comparatively speaking, internal high pressure forming only needs bending, internal high pressure forming and end cut three process, and need not follow-uply weld, has certain advance, but adopt the technology controlling and process of internal high pressure forming complicated, cost of manufacture is large, also has in actual use at present larger restriction.
Summary of the invention
High to the follow-up welding process requirement of structure manufacture based on traditional manufacturing technique, be difficult to satisfy the member coherence request, the inner high voltage moulding has certain advance, need not welding, the making precision is high, but technology controlling and process is complicated, also has in actual use larger restriction, the invention provides a kind ofly not only can simplify forming process, but also can guarantee structure manufacture precision and the method for making of effectively saving the auto trailing-arm component with variable cross-section of cost.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of method for making of auto trailing-arm component with variable cross-section, described method for making may further comprise the steps:
1) setting-out blanking: steel plate that select to set thickness carries out blanking, and the rolling direction of the length direction of blanking and raw MAT'L is consistent;
2) pre-bending: blank is done pre-bending at punch die process; And described blank has the shape that is figure-three after the pre-bending;
3) U-shaped curved: the evagination profile of the blank after the pre-bending being made the U-shaped C of curving word member at press.
4) cut edge: C word blank level is inserted punch die, makes crimping on the C font blank and intervolves according to product and require to cut edge, and guarantees the conformability of the volume seam behind the crimping;
5) intervolve in advance: put into downwards with convex surface and intervolve in advance mould, the described mould that intervolves in advance has following shape facility: the die cavity that intervolves in advance mould comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, the axis of described die cavity is continuous curve, and die cavity top seam place is outer gibbosity; First roll forming is intervolved part in advance on press;
6) volume that is shaped: will intervolve in advance the part convex surface and put into downwards to be shaped and intervolve mould, described shaping intervolves mould following shape facility: the die cavity that intervolves mould that is shaped comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, the axis of described die cavity is continuous curve, and die cavity top seam place is circular-arc; Moulding on press obtains intervolving part;
7) shaping: will intervolve part and carry out sleeve end shaping and hub end shaping at press successively;
8) moulding: shaping piece is put into the standard die cavity finish final molding, described standard die cavity has following shape facility: the standard die cavity comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, and the axis of described standard die cavity is continuous curve;
8) sew on welding at the indent volume that intervolves formation, and carry out rear processing, make auto trailing-arm component with variable cross-section.
Further, described step 5) in, the middle part of the described die cavity die cavity that intervolves in advance mould is for turning round the beam linkage section, the perimeter of section of described die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described die cavity is c-shaped;
Described step 6) in, described shaping intervolves the middle part of die cavity die cavity of mould for turning round the beam linkage section, the perimeter of section of described die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described die cavity is c-shaped;
Described step 8) in, the middle part of described standard die cavity is for turning round the beam linkage section, the perimeter of section of described standard die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described standard die cavity is c-shaped, from the wheel hub transverse plane, the axis of described standard die cavity is S-shaped, and the center of arc of the center of described hub end and sleeve end has offset distance D.
Certainly, according to the shape of different variable section trailing arm components, we can according to the shape of trailing arm component design coupling intervolve in advance mould, being shaped intervolves the shape of mould and standard die cavity.
Further again, described step 7) in, the tangent line of friendship place is cut on described axis and plane, hub end place and the angle on this plane is 35～50.8 °.
Further, described step 7) in, the cross sectional shape that described standard die cavity comprises three continuously at least or segmentation changes.
Described step 7) in, the shortest outside face of described standard die cavity element line and described hub end and the tangent line of friendship place is cut on the plane, place and the angle on this plane is 42.2～56 °; The longest outside face element line of described standard die cavity and the tangent line of friendship place is cut on plane, described hub end place and the angle on this plane is 30.6～41.8 °.
Described step 7) in, the angle on the spindle line of described sleeve end circular arc and described hub end plane is 104.8～125 °.
Described step 7) in, having the inclination angle with the angle of the spindle line of perpendicular plane, described hub end plane and described sleeve end circular arc is 0～2 °.
Described cross sectional shape is one of following: 1. circular; 2. rectangle; 3. trapezoidal; 4. oval; 5. special-shaped.Certainly, also can be other cross sectional shapes.
Described step 7) in, the shortest outside face element line of described standard die cavity is the weld line after intervolving.
Described step 1) in, the thickness of steel plate is 3～4.5 millimeters, and the mechanical property of steel plate is: yield strength σ
s=330Mpa, tensile strength sigma
s=450Mpa, stretch ratio δ=33%, hardenability value n=0.23.
The described cross section of turning round the beam linkage section is all rounded.Certainly, also can adopt other shapes.
Beneficial effect of the present invention is mainly manifested in: simplify special-shaped complicated non-uniform member forming process, the adverse effect of welding is reduced to minimum, guarantee member conformability, promote and make precision, favourable mass production.
Description of drawings
Fig. 1 is the scheme of installation of trailing arm component of vehicle.
Fig. 2 is the block diagram of auto trailing-arm component with variable cross-section.
Fig. 3 is the lateral plan of auto trailing-arm component with variable cross-section.
Fig. 4 is the A-A schematic cross-section of Fig. 3.
Fig. 5 is the B-B schematic cross-section of Fig. 3.
Fig. 6 is the C-C schematic cross-section of Fig. 3.
Fig. 7 is the D-D schematic cross-section of Fig. 3.
Fig. 8 is the E-E schematic cross-section of Fig. 3.
Fig. 9 is the schematic diagram that the auto trailing-arm component with variable cross-section of wheel hub adapter plate and axle sleeve is installed.
Figure 10 is the blank schematic diagram of blanking step.
Figure 11 is the blank schematic diagram after pre-bending is processed.
Figure 12 is the birds-eye view of Figure 11.
Figure 13 is the blank schematic diagram after the reason of U-shaped crook.
Figure 14 is the birds-eye view of Figure 13.
Figure 15 is the schematic diagram that intervolves in advance mould.
Figure 16 is the schematic diagram that intervolves in advance part.
Figure 17 is the birds-eye view of Figure 16.
Figure 18 is shaped to intervolve the schematic diagram of mould.
Figure 19 is the schematic diagram that intervolves part.
Figure 20 is the section drawing of Figure 19.
Figure 21 is the schematic diagram of standard die cavity.
Figure 22 is the schematic diagram after the moulding.
Figure 23 is the section drawing of Figure 22.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
With reference to Fig. 1～Figure 23, a kind of method for making of auto trailing-arm component with variable cross-section, described method for making may further comprise the steps:
1) setting-out blanking: the steel plate of selecting to set thickness carries out blanking, and the rolling extension direction of the blank behind the blanking is consistent with the length direction of auto trailing-arm component with variable cross-section to be produced, and described blank has c-shaped axis;
2) pre-bending: blank is done pre-bending at punch die process;
3) U-shaped curved: as to do the blank after the pre-bending U-shaped curved at press;
4) cut edge: make crimping at punch die and cut edge, cut edge according to the size of auto trailing-arm component with variable cross-section to be produced, the conformability of the volume seam behind the assurance crimping;
5) intervolve in advance: put into downwards with convex surface and intervolve in advance mould, the described mould that intervolves in advance has following shape facility: the die cavity that intervolves in advance mould comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, the axis of described die cavity is continuous curve, and die cavity top seam place is outer gibbosity; First roll forming is intervolved part in advance on press;
6) volume that is shaped: will intervolve in advance the part convex surface and put into downwards to be shaped and intervolve mould, described shaping intervolves mould following shape facility: the die cavity that moulding intervolves mould comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, the axis of described die cavity is continuous curve, and die cavity top seam place is circular-arc; Moulding on press obtains intervolving part;
7) moulding: shaping piece is put into the standard die cavity finish final molding, described standard die cavity has following shape facility: the standard die cavity comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, and the axis of described standard die cavity is continuous curve;
8) sew on welding at the indent volume that intervolves formation, and carry out rear processing, make auto trailing-arm component with variable cross-section.
Further, described step 5) in, the middle part of the described die cavity die cavity that intervolves in advance mould is for turning round the beam linkage section, the perimeter of section of described die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described die cavity is c-shaped;
Described step 6) in, described shaping intervolves the middle part of die cavity die cavity of mould for turning round the beam linkage section, the perimeter of section of described die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described die cavity is c-shaped;
Described step 8) in, the middle part of described standard die cavity is for turning round the beam linkage section, the perimeter of section of described standard die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described standard die cavity is c-shaped, from the wheel hub transverse plane, the axis of described standard die cavity is S-shaped, and the center of arc of the center of described hub end and sleeve end has offset distance D.
Certainly, according to the shape of different variable section trailing arm components, we can according to the shape of trailing arm component design coupling intervolve in advance mould, being shaped intervolves the shape of mould and standard die cavity.
Further again, described step 7) in, the tangent line of friendship place is cut on described axis and plane, hub end place and the angle on this plane is 35～50.8 °, °.
Further, described step 7) in, the cross sectional shape that described standard die cavity comprises three continuously at least or segmentation changes.
Described step 7) in, the shortest outside face of described standard die cavity element line and the tangent line of friendship place is cut on plane, described hub end place and the angle on this plane is 42.2～56 °, 35～39 ° of preferable range; The longest outside face element line of described standard die cavity and the tangent line of friendship place is cut on plane, described hub end place and the angle on this plane is 30.6～41.8 °.
Described step 7) in, the angle on the spindle line of described sleeve end circular arc and described hub end plane is 104.8～125 °.
Described step 7) in, with the angle of the spindle line of perpendicular plane, described hub end plane and described sleeve end circular arc be 0～2 °; In the time of 0 °, the spindle line parallel of the plane that described hub end plane is perpendicular and described sleeve end circular arc, certainly, angle also can adopt 0.3～1.5 °.
Described cross sectional shape is one of following: 1. circular; 2. rectangle; 3. trapezoidal; 4. oval; 5. special-shaped.
Described step 7) in, the shortest outside face element line of described standard die cavity is the weld line after intervolving.
Described step 1) in, the thickness of steel plate is 3～4.5 millimeters, and the mechanical property of steel plate is: yield strength σ
s=330Mpa, tensile strength sigma
s=450Mpa, stretch ratio δ=33%, hardenability value n=0.23.
The described cross section of turning round the beam linkage section is all rounded.Certainly, also can adopt other shapes.
In the present embodiment, several through holes corresponding to twist beam type suspension stay bearing plate mounting hole that are used for and consist of measure-alike or not identical, round or non-circle that distribute on the outer convex surface of hub end of non-uniform member are just processed in rear processing, the benchmark aperture that being used on the member belly makes the location, detects usefulness, and the circle or the non-round aperture that are used for installing wire clamp and other purposes.
In the present embodiment, described member employing material is 3～4.5 millimeters steel plate, yield strength σ
s=330Mpa, tensile strength sigma
s=450Mpa, stretch ratio δ=33%, high-strength thin plate or the mild steel plate of hardenability value n=0.23, preferentially adopting material thickness through this member of actual tests is 4.5 millimeters GB 400 High performance sheet steels, through setting-out blanking, pre-bending, U-shaped curved, cut edge, intervolve, the process forming such as shaping for as the desired basic configuration of figure, manufacturing process is as follows:
With the former material of steel plate according to the prefabricated reasonable size for ease of the punching press loading and unloading of nesting optimization scheme, the blanking of member should make the length direction of member consistent with the raw-material rolling extension direction of steel plate, to guarantee good the intervolving and ductility of material, blank is with reference to Figure 10;
2. blank is done pre-bending at punch die and process such as Figure 11 and Figure 12, also claim one-off drawing;
3. the workpiece after the pre-bending is done U-shaped curvedly such as Figure 13 at press, also claimed redrawing;
4. the U-shaped curved workpiece of above-mentioned process is made crimping at punch die and cut edge, with the conformability of the volume seam behind the assurance crimping;
Will through the workpiece of side cut with convex surface put into as shown in figure 15 intervolve in advance mould, first roll forming on press;
6. will intervolve in advance part again and intervolve mould with convex surface in the shaping of putting into as shown in figure 18, moulding on press obtains intervolving part;
7. will intervolve part and carry out the small end shaping, hold shaping and have and finish final molding in the standard die cavity greatly at press successively, described standard die cavity as shown in figure 21.
Sewing on the employing arc welding at the even volume of the indent that intervolves formation forms.Characteristics of weld seam is the shortest plain line along axis direction upper member surface.
The trailing arm component of vehicle that the present embodiment makes, take plane, hub end place as the front view direction, with the vertical plane surface on plane, described hub end place be side view orientation, the axis feature that described variable section intervolves the welding trailing arm component of vehicle is: S-type on front view, and the center of arc of hub end center and sleeve end has an offset distance D at this view, be the C type at lateral plan, with reference to Fig. 1～Fig. 3.
Difformity according to hub end, the variable section feature of trailing arm component on axis is to be circle, rectangle, trapezoidal or special-shaped continuous or that segmentation changes along each cross section of axis, at least comprise that wherein 3 or above rule or the girth of fitfull hollow section change, perimeter of section is continuously to sleeve end and changes from small to big from turning round the beam linkage section, is continuously to hub end and changes from small to big from turning round the beam linkage section.
With reference to Fig. 3, the geometric properties of trailing arm component is: the tangent line of friendship place is cut on described axis and plane, hub end place and the angle on this plane is 35～50.8 °; The spindle line of the circular arc R of sleeve end and hub end place Plane intersects are 104.8～125 ° of angles.
With reference to Fig. 3, the middle part of the trailing arm component of vehicle of making according to this method for making is for turning round the beam linkage section, and namely the B-B section plane is equal to the perimeter of section between the C-C section plane, and the cross section is all rounded; Trailing arm component begins to fade to as shown in Figure 4 special-shaped rectangle to the sleeve end direction from the B-B section plane vertical with the spindle line, and wherein the size along the paper plane direction is roughly 86 millimeters, and the approximate size on the direction vertical with paper plane is 46 millimeters; Trailing arm component begins to fade to such as Fig. 7, abnormity shown in Figure 8 to the hub end direction from the C-C section plane vertical with the spindle line, and finally fading to the hub end cross section, described hub end cross section comprises that four straight flanges being smoothly connected and four radiuses are roughly the circular arc in 15 millimeters to 28 millimeters scopes; Tangent line on the trailing arm component on the shortest outside face element line and the hub end end face section line and the angle on hub end plane are 45-49 °, tangent line on the member on the longest outside face element line and the hub end end face section line and the angle on hub end plane are 35-39 °, and maximum oad is roughly between 100 to 150 millimeters on the end face.The length dimension of the maximum of member is roughly at 450 millimeters, and greatest width dimension is roughly at 250 millimeters, and the maximum ga(u)ge size is roughly at 150 millimeters.
The present embodiment structurally is with the difference that existing trailing arm is made: (1) only has a weld seam and weld seam to be on the shortest plain line of indent of members shaft line, and weldquality almost can be ignored on the impact of member; (2) the present invention adopts Multi-step forming, intervolves to make special-shaped complicated variable section trailing arm component, has the reduction cost of manufacture, is conducive to the advantage of stable mass production.
The described content of this specification sheets embodiment only is enumerating the way of realization of the present invention's design; protection scope of the present invention should not be regarded as only limiting to the concrete form that embodiment states, protection scope of the present invention also reaches in those skilled in the art conceives the equivalent technologies means that can expect according to the present invention.
Claims (7)
1. the method for making of an auto trailing-arm component with variable cross-section, it is characterized in that: described method for making may further comprise the steps:
1) setting-out blanking: the steel plate of selecting to set thickness carries out blanking, and the rolling extension direction of the blank behind the blanking is consistent with the length direction of auto trailing-arm component with variable cross-section to be produced, and described blank has c-shaped axis;
2) pre-bending: blank is done pre-bending at punch die process;
3) U-shaped curved: as to do the blank after the pre-bending U-shaped curved at press;
4) cut edge: make crimping at punch die and cut edge, cut edge according to the size of auto trailing-arm component with variable cross-section to be produced, the conformability of the volume seam behind the assurance crimping;
5) intervolve in advance: put into downwards with convex surface and intervolve in advance mould, the described mould that intervolves in advance has following shape facility: the die cavity that intervolves in advance mould comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, the axis of described die cavity is continuous curve, and die cavity top seam place is outer gibbosity; First roll forming is intervolved part in advance on press;
6) volume that is shaped: will intervolve in advance the part convex surface and put into downwards to be shaped and intervolve mould, described shaping intervolves mould following shape facility: the die cavity that intervolves mould that is shaped comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, the axis of described die cavity is continuous curve, and die cavity top seam place is circular-arc; Moulding on press obtains intervolving part;
7) shaping: will intervolve part and carry out sleeve end shaping and hub end shaping at press successively;
8) moulding: shaping piece is put into the standard die cavity finish final molding, described standard die cavity has following shape facility: the standard die cavity comprises sleeve end and hub end, the perimeter of section of described sleeve end is less than the perimeter of section of described hub end, and the axis of described standard die cavity is continuous curve;
9) sew on welding at the indent volume that intervolves formation, and carry out rear processing, make auto trailing-arm component with variable cross-section.
2. the method for making of auto trailing-arm component with variable cross-section as claimed in claim 1, it is characterized in that: in the described step 5), the middle part of the described die cavity that intervolves in advance mould is for turning round the beam linkage section, the perimeter of section of described die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described die cavity is c-shaped;
In the described step 6), described shaping intervolves the middle part of die cavity of mould for turning round the beam linkage section, the perimeter of section of described die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described die cavity is c-shaped;
In the described step 8), the middle part of described standard die cavity is for turning round the beam linkage section, the perimeter of section of described standard die cavity is continuously to sleeve end and changes from small to big from turning round the beam linkage section, be continuously to hub end and change from small to big from turning round the beam linkage section, from the in-plane vertical with hub end, the axis of described standard die cavity is c-shaped, from the wheel hub transverse plane, the axis of described standard die cavity is S-shaped, and the center of arc of the center of described hub end and sleeve end has offset distance D.
3. the method for making of auto trailing-arm component with variable cross-section as claimed in claim 1 or 2 is characterized in that: in the described step 8), and the cross sectional shapes that described standard die cavity comprises three continuously at least or segmentation changes.
4. the method for making of auto trailing-arm component with variable cross-section as claimed in claim 3 is characterized in that: described cross sectional shape is one of following: 1. circular; 2. rectangle; 3. trapezoidal; 4. oval.
5. the method for making of auto trailing-arm component with variable cross-section as claimed in claim 1 or 2 is characterized in that: in the described step 8), the shortest outside face element line of described standard die cavity is the weld line after intervolving.
6. the method for making of auto trailing-arm component with variable cross-section as claimed in claim 1 or 2, it is characterized in that: in the described step 1), the thickness of steel plate is 3 ~ 4.5 millimeters, and the mechanical property of steel plate is: yield strength σ
s=330Mpa, tensile strength sigma
s=450Mpa, stretch ratio δ=33%, hardenability value n=0.23.
7. the method for making of auto trailing-arm component with variable cross-section as claimed in claim 2 is characterized in that: the described cross section of turning round the beam linkage section is all rounded.
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| CN102764949B (en) * | 2012-07-10 | 2016-12-21 | 湖北先驰交通装备有限公司 | Longitudinal beam shapes the process of plate many flex points staight scissors correction of the flank shape blanking |
| CN105537861B (en) * | 2014-11-03 | 2017-11-24 | 柳州市高成机械制造有限公司 | A kind of processing method of trailing arm |
| CN104785619A (en) * | 2015-03-31 | 2015-07-22 | 衡阳风顺车桥有限公司 | Frame variable cross-section bent tube beam machining process |
| CN116352441B (en) * | 2023-03-15 | 2023-12-15 | 舆软科技(上海)有限责任公司 | Method for stamping and forming special-shaped, closed and variable-section beam parts by using plate materials |
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| CN101072696A (en) * | 2004-12-08 | 2007-11-14 | 汽车底盘国际Snc公司 | Flexible axle comprising a cross-member with trapezoid cross-section, corresponding cross-member, vehicle and manufacturing method |
| CN101096174A (en) * | 2006-06-29 | 2008-01-02 | 上海汽车股份有限公司中国弹簧厂 | Automobile stabilizer bar and manufacturing method thereof |
| CN101623996A (en) * | 2008-07-09 | 2010-01-13 | 株式会社和信 | Beam formed by plank and making method thereof |
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| CN102092259A (en) | 2011-06-15 |
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