CN112588953A - Process method for controlling surface quality of upper frame area of side wall - Google Patents
Process method for controlling surface quality of upper frame area of side wall Download PDFInfo
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- CN112588953A CN112588953A CN202011317896.8A CN202011317896A CN112588953A CN 112588953 A CN112588953 A CN 112588953A CN 202011317896 A CN202011317896 A CN 202011317896A CN 112588953 A CN112588953 A CN 112588953A
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- 238000000034 method Methods 0.000 title claims abstract description 83
- 239000000463 material Substances 0.000 claims abstract description 68
- 238000003825 pressing Methods 0.000 claims abstract description 47
- 238000009966 trimming Methods 0.000 claims abstract description 31
- 238000007493 shaping process Methods 0.000 claims abstract description 30
- 239000000047 product Substances 0.000 claims abstract description 8
- 239000013589 supplement Substances 0.000 claims abstract description 8
- 239000011324 bead Substances 0.000 claims description 11
- 238000004088 simulation Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002407 reforming Methods 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 208000016063 arterial thoracic outlet syndrome Diseases 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a process method for controlling the surface quality of an upper frame area of a side wall, which belongs to the technical field of stamping, and comprises a first process step of drawing; a second step of trimming: when trimming, a part of the process supplement area and the material pressing surface at the outer side of the upper frame part needs to be reserved and cannot be completely trimmed; and a third procedure, namely, flanging and shaping the inclined wedge: the manipulator places the upper process part on the punch of the present process, the cylinder pushes the filling punch to be in place, the positive pressure plate presses the A-level curved surface of the upper frame, the inclined pressure plate presses the process supplement area and the pressure surface on the outer side, and then the flanging and shaping insert starts to work until the work limiters on the upper die body and the lower die body are blocked, and the flanging and shaping work is finished; a fourth step of trimming the inclined wedge: and (5) trimming off the inclined pressing area outside the product. The invention enhances the material pressing strength of the positive pressure material plate, weakens the material pressing strength of the wedge under the condition of ensuring that shaping is not wrinkled, fundamentally eliminates the material fleeing state when the wedge is flanged, and leads the actual rebound value of the upper frame area of the side wall to be closer to the theoretical simulation.
Description
Technical Field
The invention belongs to the technical field of stamping, and particularly relates to a process method for controlling the surface quality of an upper frame area of a side body.
Background
In the automobile outer covering part, the integral side wall is one of key parts in the automobile body outer covering part, the structural size of the integral side wall is the largest one in the covering parts, the part has complicated geometric shape and extremely high requirements on surface quality and dimensional precision, and as a welding reference of the whole automobile, the integral side wall has very complicated matching relation and has strict matching relation with main parts such as a fender, a top cover, a trunk, a wheel cover, a floor side beam, front and rear doors and the like. In summary, in order to meet the requirements of product dimensional accuracy and matching, research must be performed on the forming process to eliminate the situation that the actual production does not accord with the design intent, so that the theory better guides the actual production.
In the side shaping process with oblique material pressing in the outer side area of the upper frame of the side body, the shifting of the panel material A is easy to occur, and the shifting of the panel material can cause a series of problems of deformation of a workpiece in the whole upper area of the side body, poor fitting performance of the workpiece in the post process, out-of-control rebound, surface quality and the like. The surface quality is solved by using the rectification method, so that great resources are wasted, and an ideal rectification effect cannot be obtained. The situation is inconsistent with the intention of design simulation, so that uncertainty is increased, and the debugging and rectification period of the die is greatly influenced.
The upper frame area of the side wall is overlapped with the top cover and the front windshield, and is an area with high requirements on matching precision and surface quality in both appearance and function aspects. The shaping characteristics of the stamping die determine that the stamping process of the product needs to be finished in different working procedures: a first step of drawing; a second step of trimming; thirdly, flanging and shaping the inclined wedge; a fourth step: and (5) trimming by using a tapered wedge.
After drawing, when trimming is performed on the conventional second-order die, the shape of the press face of the upper frame area is trimmed off, and the shape of the press face of a part of the workpiece, including the part with the draw bead, is retained, as shown in fig. 3. When the third-order inclined wedge is used for flanging, as shown in fig. 5, the inclined pressing plate drives the draw bead to press materials, so that strong feeding restriction is generated. Whereas the conventional main nip plate presses only the front face, i.e., face a shown in fig. 5. The constraint force of the inclined pressing plate is larger than that of the positive pressing plate under the condition, the inclined wedge overturning process is a material shortage process, and the material is in a state that the side wall A surface of the material flows to the structural surface of the overturning area. In the inclined wedge flanging and shaping procedure, due to the fact that the pressing force of the positive pressure material plate is insufficient, the pressing constraint of the inclined pressing material plate is too strong, materials flow to the shaping area from the inclined pressing area on the outer side and the positive pressing area on the inner side simultaneously in the shaping process of the area, and the problems of the side wall upper frame A, the surface size precision and the surface quality caused by the material flow of the positive pressing area on the inner side are not allowed. In general, after the flanging of the wedge in the third process is finished, the upper frame area can generate deformation with different degrees, according to ATOS scanning data, the rebound value of the area can be more than 2mm, and the size deviation value can be kept until the punching process of the workpiece is finished; when the working procedure piece is placed on the fourth-procedure die, the working procedure piece is not in shape, and the problems of taking and placing the piece and positioning can be caused. To control the surface quality (dimensional accuracy and finish) of the side surround top frame area, it is necessary to allow material to flow from the bias nip area to the truing area, keeping the positive nip (side surround top frame a and surface) area free of material flow.
Disclosure of Invention
In order to solve the surface quality problem caused by the panel material movement of the side wall upper frame A in the prior art, the invention provides a process method for controlling the surface quality of the side wall upper frame area.
The invention is realized by the following technical scheme:
a process method for controlling the surface quality of an upper frame area of a side wall specifically comprises the following steps:
a first step of drawing;
a second step of trimming: when trimming, a part of the process supplement area and the material pressing surface at the outer side of the upper frame part needs to be reserved and cannot be completely trimmed;
the method is characterized in that when the wedge is turned and shaped in the third procedure, an outer pressing material is arranged in the area, and the wrinkling condition of the structural surface of the area is eliminated by constraint feeding;
and a third procedure, namely, flanging and shaping the inclined wedge: the manipulator places the upper process part on the punch of the present process, the cylinder pushes the filling punch to be in place, the positive pressure plate presses the A-level curved surface of the upper frame, the inclined pressure plate presses the process supplement area and the pressure surface on the outer side, and then the flanging and shaping insert starts to work until the work limiters on the upper die body and the lower die body are blocked, and the flanging and shaping work is finished;
a fourth step of trimming the inclined wedge: and (5) trimming off the inclined pressing area outside the product.
Further, a second-procedure trimming die is modified, the die is trimmed in the second procedure, the draw bead and the outer pressing surface of the draw bead in the upper frame area are trimmed, and an area 5mm away from the R tangent point of the die orifice is reserved, so that the area of a procedure part pressed by the outer inclined pressing plate in the third procedure is reduced while wrinkling is controlled.
Further, a third-order wedge flanging and shaping die is modified, pressing materials (a surface b and a surface c shown in fig. 6) on the inner side wall of the door opening near the upper frame of the positive pressure material surface are added, namely the area of the positive pressure material surface is increased, and the area is subjected to strong pressure of 0.05mm-0.2mm according to actual thinning of materials.
Compared with the prior art, the invention has the following advantages:
in the rebound rectifying and reforming process, the problem of difference between the rebound compensation and the actual workpiece size caused by a plurality of uncertain factors is often solved, and the method can eliminate the uncertainty of work difference caused by the movement of the plate when the side-surrounding upper frame area is obliquely shaped, so that the actual production is closer to theoretical simulation.
Compared with the traditional wedge flanging process, the wedge flanging process has the advantages that after the wedge flanging process is improved, the pressing strength of the positive pressure plate is enhanced, the pressing strength of the wedge is weakened under the condition that shaping is not wrinkled, the material fleeing state during wedge flanging is fundamentally eliminated, and the actual resilience value of the upper frame area of the side body is closer to theoretical simulation.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic view of the upper frame area of the side panel;
FIG. 2 is a sectional view of a wedge flanging sizing die structure;
FIG. 3 is a schematic view of a conventional deburring process;
FIG. 4 is a schematic view of the deburring of the present invention;
FIG. 5 is a schematic cross-sectional view of a conventional third-step frame-mounting region wedge flanging shaping step;
FIG. 6 is a schematic cross-sectional view of a third step frame region wedge flanging sizing step of the present invention;
Detailed Description
The following embodiments are only used for illustrating the technical solutions of the present invention more clearly, and therefore, the following embodiments are only used as examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
A process method for controlling the surface quality of an upper frame area of a side wall specifically comprises the following steps:
a first step of drawing;
a second step of trimming: when trimming, a part of the process supplement area and the material pressing surface at the outer side of the upper frame part needs to be reserved and cannot be completely trimmed;
the method is characterized in that when the wedge is turned and shaped in the third procedure, an outer pressing material is arranged in the area, and the wrinkling condition of the structural surface of the area is eliminated by constraint feeding;
and a third procedure, namely, flanging and shaping the inclined wedge: the manipulator places the upper process part on the punch of the present process, the cylinder pushes the filling punch to be in place, the positive pressure plate presses the A-level curved surface of the upper frame, the inclined pressure plate presses the process supplement area and the pressure surface on the outer side, and then the flanging and shaping insert starts to work until the work limiters on the upper die body and the lower die body are blocked, and the flanging and shaping work is finished;
a fourth step of trimming the inclined wedge: and (5) trimming off the inclined pressing area outside the product.
And (3) modifying the second-procedure trimming die, trimming the die in the second procedure, trimming the draw bead and the outer pressing surface of the draw bead in the upper frame area, and reserving an area 5mm away from the R tangent point of the die orifice, so that the area of a procedure part pressed by an outer inclined pressing plate in the third procedure is reduced while wrinkling is controlled.
And (3) reforming a third-order wedge flanging and sizing die, increasing the pressing material (a surface b and a surface c shown in figure 6) on the inner side wall of the door opening near the upper frame of the positive pressure charge level, namely increasing the area of the positive pressure charge level, and performing 0.05-0.2 mm of strong pressure on the area according to the actual thinning of the material.
The same kind of problems are encountered in the production process of the Y17004MA side wall. The initial stamping process is designed according to the original content, namely: when the second-order die is used for trimming, the shape of a pressing surface of a part of the workpiece is reserved, and the pressing surface comprises a part with a draw bead; the third-order inclined material pressing plate drives the drawing bead to press materials, so that strong feeding restraint can be realized, the positive pressure material plate lacks strong pressure on the inner side of the window frame, and the condition of workpiece movement exists in the flanging process. Resulting in poor dimensional accuracy of the entire top frame area of the article. And (4) cutting off the waste material area of the second-sequence workpiece in the later period, and welding to enhance the material pressing and coloring at the inner side of the third-sequence window frame. Finally obtaining the product with qualified dimensional precision.
The principle of the invention is as follows:
the ideal effect of the wedge flanging reshaping is analyzed according to fig. 6, that is, the structural surface of the flanging reshaping needs to be made of a material which should flow from the outer side to the inner side, and the oblique material pressing plate is used for applying proper constraint during the material flowing from the outer side to the inner side so as to limit the structural surface from wrinkling during the flanging. But must ensure that the a-side material does not flow. Because the material flows outwards, the upper frame area of the side wall is distorted and deformed, namely, the ridge line overlapped with the door is higher, and the ridge line overlapped with the top cover and the front windshield is lower.
Through the theoretical basis analysis of the wedge flanging and shaping of the side surrounding upper frame area, the fundamental reason for causing the sheet material to move is that the outer side constraint is too strong and the positive pressure material plate constraint is too weak during the wedge flanging and shaping in the third procedure. The theoretical basis shows that the method for solving the problem of sheet material movement is to strengthen the positive pressure material restraint at the inner side and lighten the material restraint of the inclined wedge at the outer side.
According to the method for controlling the rebound of the side body upper frame area, as shown in fig. 4, a second trimming die is modified, and when trimming is performed in the second sequence, a material pressing area 5mm away from the R cutting point of a die opening of the side body upper frame area is trimmed, and a waste material cutter is added; and (3) reforming the third-order flanging shaping, wherein the surface a of the positive pressure material plate is subjected to strong pressure, the surfaces b and c are positioned on the side wall, the material is thinned greatly, and the value of the strong pressure is determined according to the thinning of the material. After the material pressing of the outer side wedge is trimmed in the second sequence, only a 5mm straight section material pressing area is reserved, and the material pressing gap is doubled in material thickness as shown in fig. 6. Compared with the traditional wedge flanging process, after the transformation of the invention, the material pressing area and the strength of the positive pressure material plate are enhanced, the material pressing area and the strength of the oblique pressure material plate are reduced, the material pressing area and the strength of the oblique pressure material plate are weakened under the condition of ensuring that the shaping is not wrinkled, the material fleeing state during the wedge flanging is fundamentally eliminated, and the actual resilience value of the upper frame area of the side wall is closer to the theoretical simulation.
See figure 1 for a side view top box. The shaped areas shown in the figures are areas of the product article that are involved in the present invention.
Referring to fig. 2, a cross-sectional view of a third process oblique flanging die is shown. When the die works, the upper striking rod 3 provides a pressure force source for the main pressure plate 4, after the stroke release of the main pressure plate 4 is completed, the wedge pressure plate 7 and the flanging insert 5 move together with the upper die body 1, then the wedge pressure plate 7 provided with the force source by the nitrogen cylinder 6 starts to contact with the plate, after the stroke release of the wedge pressure plate 7 is completed, the flanging insert 5 starts to be flanged, the flanging insert 3 and the filling male die 9 are extruded to form, and after the work limiter 2 on the upper die body 1 and the lower die body 10 is upset, the flanging work is completed.
Referring to fig. 3, a second sequence of conventional trimming and shaping is shown. The traditional trimming process reserves the shape of a pressed material face of a part of a workpiece with a draw bead.
Refer to fig. 4 for a schematic diagram of the modified trimming configuration in the second sequence. And (3) trimming all the material pressing surfaces with the shape of the draw beads, and only keeping a material pressing area which is 5mm away from the R tangent point of the die orifice of the side wall upper frame area.
Referring to fig. 5, a third conventional flanging and shaping diagram is shown. The inside 2mm of main pressure flitch door frame is empty to be opened.
Refer to fig. 6 for a third sequence of flanging and shaping. The thinning value of the inner side of the upper door frame of the side wall is theoretically researched, repeated tests prove that the high pressure value of the inner side of the door frame of the main pressure plate is determined according to the thinning of materials, the main pressure plate is stably colored, and the amount of the material for benchwork research is reasonable.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (3)
1. A process method for controlling the surface quality of an upper frame area of a side wall is characterized by comprising the following steps:
a first step of drawing;
a second step of trimming: when trimming, a part of the process supplement area and the material pressing surface at the outer side of the upper frame part needs to be reserved and cannot be completely trimmed;
and a third procedure, namely, flanging and shaping the inclined wedge: the manipulator places the upper process part on the punch of the present process, the cylinder pushes the filling punch to be in place, the positive pressure plate presses the A-level curved surface of the upper frame, the inclined pressure plate presses the process supplement area and the pressure surface on the outer side, and then the flanging and shaping insert starts to work until the work limiters on the upper die body and the lower die body are blocked, and the flanging and shaping work is finished;
a fourth step of trimming the inclined wedge: and (5) trimming off the inclined pressing area outside the product.
2. The process method for controlling the surface quality of the upper frame area of the side wall as claimed in claim 1, wherein the trimming of the second process is to trim the draw bead and the outer pressing surface of the upper frame area, and to reserve an area 5mm away from the R-cut point of the die orifice, so as to reduce the area of the process piece pressed by the outer inclined pressing plate in the third process while controlling wrinkling.
3. The process method for controlling the surface quality of the upper frame area of the side body according to claim 1, wherein the tapered wedge in the third step is used for flanging and shaping, the pressing of the side wall of the door opening near the upper frame of the positive pressure material surface is increased, namely the area of the positive pressure material surface is increased, and the area is subjected to strong pressure of 0.05mm-0.2mm according to the actual thinning of the material.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351744A (en) * | 2021-05-14 | 2021-09-07 | 天津一汽丰田汽车有限公司 | High-strength steel medium plate stamping part capable of preventing edge cracking, manufacturing method and application |
| CN114054628A (en) * | 2021-10-13 | 2022-02-18 | 东风本田汽车有限公司 | Integrated manufacturing method of side wall outer plate and rain gutter and vehicle |
| CN114749553A (en) * | 2022-03-17 | 2022-07-15 | 中国第一汽车股份有限公司 | Technological method and compensation method for controlling contour dimension of top cover |
| CN115502296A (en) * | 2022-08-10 | 2022-12-23 | 中国第一汽车股份有限公司 | Forming process of ridge line of hair cover outer plate |
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| CN113351744B (en) * | 2021-05-14 | 2022-06-21 | 天津一汽丰田汽车有限公司 | High-strength steel medium plate stamping part capable of preventing edge cracking, manufacturing method and application |
| CN114054628A (en) * | 2021-10-13 | 2022-02-18 | 东风本田汽车有限公司 | Integrated manufacturing method of side wall outer plate and rain gutter and vehicle |
| CN114054628B (en) * | 2021-10-13 | 2023-10-27 | 东风本田汽车有限公司 | Integrated manufacturing method of side wall outer plate and rain gutter and vehicle |
| CN114749553A (en) * | 2022-03-17 | 2022-07-15 | 中国第一汽车股份有限公司 | Technological method and compensation method for controlling contour dimension of top cover |
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