CN113714396A - Drum-shaped rail vehicle side wall upright post, forming die and forming method - Google Patents
Drum-shaped rail vehicle side wall upright post, forming die and forming method Download PDFInfo
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- CN113714396A CN113714396A CN202110905123.XA CN202110905123A CN113714396A CN 113714396 A CN113714396 A CN 113714396A CN 202110905123 A CN202110905123 A CN 202110905123A CN 113714396 A CN113714396 A CN 113714396A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005452 bending Methods 0.000 claims description 18
- 230000007704 transition Effects 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 238000010923 batch production Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- 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
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention relates to the technical field of basic part forming, in particular to a drum-shaped rail vehicle side wall upright post, a forming die and a forming method, wherein the method comprises the following steps: placing the side wall upright post into the first insert of the lower die and positioning; driving the upper die to move downwards, keeping the first insert of the upper die and the first insert of the lower die to be attached to the outer surface of the side wall stand column until the relative positions of the first insert of the upper die and the first insert of the lower die are fixed, and realizing the profiling of the side wall stand column; and controlling the upper die second insert to move downwards relative to the upper die first insert until the upper die second insert is contacted with the lower die second insert and does not move relatively any more, so that the side wall stand column is simmered and bent. The invention can improve the working efficiency of the side wall upright post forming and ensure the quality of the side wall upright post forming.
Description
Technical Field
The invention relates to the technical field of basic part forming, in particular to a drum-shaped rail vehicle side wall upright post, a forming die and a forming method.
Background
At present, drum-shaped vehicle bodies are more applied to aluminum alloy vehicles, and have more mature experience in material use, process and tooling; the application of the steel on carbon steel and stainless steel vehicles is still in the initial stage, and more problems exist.
The side wall upright post is an important part in the side wall of the drum-shaped rail car, is a main bearing part of a side wall and a roof component, and the forming precision of the side wall upright post is the basis for determining whether the drum-shaped car can succeed or not. Because the side wall plate is not molded in advance, but is molded by taking the side wall upright columns as a reference, if the radian, the angle and the arc center position of each side wall upright column are too large, the deviation of the side wall plate is larger after the side wall upright columns are molded.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a side wall upright post of a drum-shaped rail vehicle, a forming die and a forming method, which can improve the forming work efficiency of the side wall upright post and ensure the forming quality of the side wall upright post.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a drum-shaped rail vehicle side wall upright post, which comprises a left piece and a right piece which are symmetrically distributed, wherein the left piece and the right piece respectively comprise a first straight line section and a second straight line section, and the first straight line section and the second straight line section are connected through an arc-shaped transition section.
With reference to the first aspect, further, the sidewall pillar includes a vertical surface, an upper wing surface connected to an upper end of the vertical surface, and a lower wing surface connected to a lower end of the vertical surface, and the cross section of the sidewall pillar is in a shape of a Chinese character 'yi'.
With reference to the first aspect, further, a plurality of oblong holes are distributed on the vertical surface, a plurality of key holes are distributed on the lower airfoil surface, and the oblong holes and the key holes close to the arc-shaped transition section are offset to the straight line sections on two sides.
With reference to the first aspect, further, the oblong hole and the keyway are offset from the arcuate transition by a distance greater than 50 mm.
In combination with the first aspect, further, the side wall pillars are made of 3-Q350EWR1 material.
With reference to the first aspect, further, the included angle between the first straight line segment and the second straight line segment is 6.7 °.
In a second aspect, the invention provides a forming die for a side wall upright post of a drum-shaped rail vehicle, wherein the side wall upright post comprises two straight line sections which are connected through an arc-shaped transition section, and the die comprises an upper die and a lower die;
an upper die first insert is arranged in the upper die, a lower die first insert is arranged in the lower die, and the upper die first insert and the lower die first insert are concave-convex dies which are matched with each other and used for realizing the profiling of straight-line sections;
the upper die is internally provided with an upper die second insert, the lower die is internally provided with a lower die second insert, the upper die second insert and the lower die second insert are concave-convex dies matched with each other, the bending radian of the upper die second insert and the lower die second insert is the same as that of the side wall stand column to be formed, and the bending machine is used for realizing the arc transition section.
In combination with the second aspect, further, the first insert of the lower die is provided with a positioning pin for fixing the side wall stand column.
In combination with the second aspect, further, the moving stroke of the first insert of the upper die is 5-10 mm higher than the forming height of the side wall stand column.
In a third aspect, the present invention provides a method for forming a sidewall pillar of a drum-shaped rail vehicle, comprising:
feeding a side wall stand column to be molded into a first insert of a lower die and positioning;
driving the upper die to move downwards, keeping the first insert of the upper die and the first insert of the lower die to be attached to the outer surface of the side wall stand column until the relative positions of the first insert of the upper die and the first insert of the lower die are fixed, and realizing the profiling of the side wall stand column;
and controlling the upper die second insert to move downwards relative to the upper die first insert until the upper die second insert is contacted with the lower die second insert and does not move relatively any more, so that the side wall stand column is simmered and bent.
Compared with the prior art, the invention has the following beneficial effects:
the side wall upright column provided by the invention is provided with the left part and the right part which are symmetrically distributed, the left part and the right part can be integrally formed, and the bending and the distortion of the left part and the right part can be mutually inhibited in the profiling process, so that the consistency of the left part and the right part is ensured, and the requirement of batch production is met; for the key hole on the lower airfoil surface close to the arc transition section and the long circular hole on the vertical surface to deviate towards the straight line section, the forming stability of the side wall upright post is further ensured;
according to the side wall stand column forming die, the upper die first insert and the lower die first insert are matched with each other to realize profiling of straight line sections, and the upper die second insert and the lower die second insert are matched with each other to realize bending of the side wall stand column, namely the forming die provided by the invention can realize profiling and bending of the side wall stand column at the same time, so that the work efficiency of side wall stand column forming is improved, and the forming quality of the side wall stand column is ensured;
according to the side wall upright post forming method, the side bending and twisting phenomena in the side wall upright post forming process are effectively limited by combining the profiling and the bending, the technological advantages of the profiling and the bending are exerted, the side wall upright post can be produced in batch, the standard requirements of the side wall upright post can be met, and the quality of the vertical face of the side wall is ensured;
the side wall upright post forming die and the forming method provided by the invention are applied to the forming of the lower upright post of the side wall window, and the detection shows that the gaps between the angle and the radian of the formed upright post and the whole sample plate are less than or equal to 0.7mm, the side surface planeness is less than or equal to 1.2mm, the verticality between the airfoil surface and the vertical surface is less than or equal to 0.5mm, the wrinkling and twisting phenomena are avoided, and the assembling requirements of the post process can be met.
Drawings
Fig. 1 is a schematic structural diagram of a sidewall pillar provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an operating state of a mold for molding a sidewall pillar of a drum-shaped rail vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of the upper die of FIG. 2;
FIG. 4 is a schematic view of the lower die of FIG. 2;
FIG. 5 is a schematic view of the first insert of the upper die of FIG. 2;
FIG. 6 is a flow chart of a method for forming a sidewall pillar of a drum type rail vehicle according to an embodiment of the present invention;
in the figure: 1. side wall columns; 2. a right piece; 3. a left part; 2a, 3a, a first straight line segment; 2b, 3b, a second straight line segment; 102. a second insert of the upper die; 301. a first insert of an upper die; 202. a second insert of the lower die; 203. a first insert of the lower die; 207. 105, an upper die; 201. and (5) a lower die.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The first embodiment is as follows:
as shown in fig. 1, an embodiment of the present invention provides a sidewall pillar, which includes a left member 3 and a right member 2 that are arranged in parallel, where the left member 3 and the right member 2 are distributed in bilateral symmetry. During manufacturing, the left part 3 and the right part 2 can be integrally formed, and the bending and the twisting of the left part and the right part can be mutually inhibited in the profiling process, so that the consistency of the left part and the right part is ensured, and the requirement of batch production can be met.
The left piece 3 and the right piece 2 respectively comprise a first straight line section 2b, 3b and a second straight line section 2b, 3b, and the first straight line section 2b, 3b and the second straight line section 2b, 3b are connected through an arc transition section. In particular, the arcuate transition section may be arcuate.
The cross section of the side wall upright column provided by the embodiment of the invention is in a Z shape, and the side wall upright column comprises a vertical surface, an upper wing surface connected to the upper end of the vertical surface and a lower wing surface connected to the lower end of the vertical surface, wherein a plurality of long round holes are distributed on the vertical surface, and a plurality of key holes are distributed on the lower wing surface.
According to the field test condition, the key hole and the vertical face long round hole at the arc position of the side wall stand column are found to influence the forming quality and stability, and the positions of the key hole and the long round hole are adjusted by combining the requirements of computer simulation, field test and post-process installation, specifically: the key hole on the lower airfoil surface close to the arc transition section and the long circular hole on the vertical surface are deviated towards the straight line section, after deviation, the distance between the long circular hole and the key hole deviated from the arc transition section is larger than 50mm, and according to test feedback, the forming stability of the side wall stand column can be ensured under the condition, and the requirement of batch production can be met.
In the embodiment of the invention, the side wall upright posts are made of 3-Q350EWR1 materials. The included angle between the first straight line segment and the second straight line segment is 6.7 degrees.
Example two:
the embodiment of the invention provides a drum-shaped rail vehicle side wall upright post forming die, which can be used for forming the side wall upright post in the first embodiment, and comprises the following components: comprises an upper die 105 and a lower die 201; as shown in fig. 2, 3, 4, 5:
an upper die first insert 301 is arranged in the upper die 105, a lower die first insert 203 is arranged in the lower die 201, and the upper die first insert 301 and the lower die first insert 203 are concave-convex dies which are matched with each other and used for realizing the profiling of straight line sections.
The upper die 105 is internally provided with an upper die second insert 102, the lower die 201 is internally provided with a lower die second insert 202, the upper die second insert 102 and the lower die second insert 202 are also matched concave-convex dies, and the upper die second insert 102 and the lower die second insert 202 are copying inserts manufactured according to the rebound quantity and the side bending quantity calculated by combining the arc transition section of the side wall stand column with computer simulation, and are used for realizing the bending of the arc transition section.
The first insert 301 of the upper die is a movable part, the height of the movable stroke of the first insert 301 of the upper die is 5-10 mm higher than that of the side wall stand column 1, and the purpose is to ensure that the first insert 203 of the lower die and the first insert 301 of the upper die compress the side wall stand column before the second insert of the upper die and the second insert of the lower die are contacted, so that the phenomena of offset, tilting and the like of the side wall stand column are prevented.
The first insert 203 of the lower die is provided with a positioning pin 207 for fixing the side wall upright post 1, so that the forming size of the side wall upright post 1 is more accurate, and the phenomena of offset, material sliding and the like of the side wall upright post 1 in the forming process can be prevented.
The molding method of the molding die for the side wall upright post of the drum-shaped rail vehicle provided by the embodiment of the invention comprises the following steps:
feeding a side wall upright post to be molded into a first insert 203 of the lower die and positioning by using a positioning pin 207;
driving the upper die to move downwards, keeping the first insert 301 of the upper die and the first insert 203 of the lower die to be tightly attached to the outer surface of the side wall upright 1 during the operation until the relative positions of the first insert 301 of the upper die and the first insert 203 of the lower die are fixed, tightly pressing the side wall upright 1 by the first insert 301 of the upper die and the first insert 203 of the lower die, and finishing the pressing of the side wall upright 1;
and controlling the upper die second insert 102 to move downwards relative to the upper die first insert 301 until the upper die second insert 102 is contacted with the lower die second insert 202 and does not move relatively any more, so as to realize the simmering bending of the side wall upright post 1.
The forming die provided by the embodiment of the invention can realize profiling and bending of the side wall upright post 1 at the same time, is beneficial to improving the forming work efficiency of the side wall upright post 1 and ensures the forming quality of the side wall upright post 1.
Example three:
as shown in fig. 6, the method for forming a sidewall pillar of a drum-shaped rail vehicle according to an embodiment of the present invention may use the forming mold according to the second embodiment to form the sidewall pillar according to the first embodiment, and the method includes the following steps:
the method comprises the following steps: feeding the side wall upright post to be molded into the first insert 203 of the lower die and positioning;
step two: driving the upper die 105 to move downwards, and keeping the first insert 301 of the upper die and the first insert 203 of the lower die to be tightly attached to the outer surface of the side wall upright 1 until the relative positions of the first insert 301 of the upper die and the first insert 203 of the lower die are fixed, so as to realize the profiling of the side wall upright 1;
step three: and controlling the upper die second insert 102 to move downwards relative to the upper die first insert 301 until the upper die second insert 102 is contacted with the lower die second insert 202 and does not move relatively any more, so as to realize the simmering bending of the side wall upright post 1.
In the first step, the side wall stand column to be formed can be positioned by a positioning pin, and a positioning hole matched with the positioning pin can be formed in the corresponding side wall plate.
It should be noted that the side wall pillar to be formed is firstly bent into a structure with a cross section in a shape of a Chinese character 'yi' before being sent into the first insert of the lower die.
In order to further verify the forming method provided by the embodiment of the invention, the forming experiment is carried out on the lower stand column of the side wall window, the angle and radian of the lower stand column of the side wall window formed by the forming method provided by the embodiment of the invention and the gap between the whole sample plate are less than or equal to 0.7mm, the wing surface degree of the side surface is less than or equal to 1.2mm, the verticality between the wing surface and the vertical surface is less than or equal to 0.5mm, no wrinkling or distortion phenomenon exists, and the assembling requirement of the post process can be met.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The side wall stand column of the drum-shaped rail vehicle is characterized by comprising a left piece and a right piece which are symmetrically distributed, wherein the left piece and the right piece respectively comprise a first straight line section and a second straight line section, and the first straight line section and the second straight line section are connected through an arc transition section.
2. The drum rail vehicle sidewall column of claim 1, wherein the sidewall column comprises a facade, an upper airfoil surface connected to an upper end of the facade, and a lower airfoil surface connected to a lower end of the facade, the sidewall column having a cross-section in the shape of a chevron.
3. The drum rail vehicle sidewall pillar as claimed in claim 2, wherein a plurality of oblong holes are distributed on said vertical surface, and a plurality of key holes are distributed on said lower airfoil surface, wherein said oblong holes and key holes near the curved transition section are offset to two side straight line segments.
4. The drum rail vehicle sidewall pillar as claimed in claim 3, wherein the oblong hole and the keyway are offset from the arcuate transition segment by a distance greater than 50 mm.
5. The drum rail vehicle sidewall pillar as claimed in claim 1, wherein said sidewall pillar is selected from the group consisting of 3-Q350EWR1 material.
6. The drum rail vehicle sidewall pillar as claimed in any one of claims 1 to 5, wherein said first and second linear segments have an included angle of 6.7 °.
7. A forming die for a side wall upright post of a drum-shaped rail vehicle is characterized in that the die comprises an upper die (105) and a lower die (201);
an upper die first insert (301) is arranged in the upper die (105), a lower die first insert (203) is arranged in the lower die (201), and the upper die first insert (301) and the lower die first insert (203) are concave-convex dies which are matched with each other and are used for realizing the profiling of straight sections;
the bending machine is characterized in that an upper die second insert (102) is arranged in the upper die (105), a lower die second insert (202) is arranged in the lower die (201), the upper die second insert (102) and the lower die second insert (202) are matched with each other, the bending radian of the upper die second insert (102) and the lower die second insert (202) is the same as that of a side wall stand column (1) to be formed, and the bending machine is used for realizing bending of an arc transition section.
8. The drum type rail vehicle side wall column forming die of claim 7, wherein the lower die first insert (203) is provided with a positioning pin (207) for fixing the side wall column (1).
9. The forming die for the side wall stand column of the drum-shaped rail vehicle as claimed in claim 7 or 8, wherein the moving stroke of the upper die first insert (301) is 5-10 mm higher than the forming height of the side wall stand column (1).
10. A method for molding a side wall upright post of a drum-shaped rail vehicle is characterized by comprising the following steps:
feeding a side wall upright post to be molded into a first insert (203) of a lower die and positioning;
driving an upper die (105) to move downwards, keeping a first insert (301) of the upper die and a first insert (203) of the lower die to be tightly attached to the outer surface of the side wall upright post (1) in the period until the relative positions of the first insert (301) of the upper die and the first insert (203) of the lower die are fixed, and realizing the profiling of the side wall upright post;
and controlling the upper die second insert (102) to downwards move relative to the upper die first insert (301) until the upper die second insert (102) is contacted with the lower die second insert (202) and does not move relatively any more, so that the side wall upright post is simmered and bent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110905123.XA CN113714396A (en) | 2021-08-08 | 2021-08-08 | Drum-shaped rail vehicle side wall upright post, forming die and forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110905123.XA CN113714396A (en) | 2021-08-08 | 2021-08-08 | Drum-shaped rail vehicle side wall upright post, forming die and forming method |
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| Publication Number | Publication Date |
|---|---|
| CN113714396A true CN113714396A (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110905123.XA Pending CN113714396A (en) | 2021-08-08 | 2021-08-08 | Drum-shaped rail vehicle side wall upright post, forming die and forming method |
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| CN (1) | CN113714396A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228921A (en) * | 2011-04-21 | 2011-11-02 | 吉林大学 | Method for forming aluminum alloy end wall column member for new-generation high-speed motor train unit |
| JP2015174145A (en) * | 2014-03-12 | 2015-10-05 | ジョンス キム | Rail molding equipment for sunroof panel |
| CN206083581U (en) * | 2016-07-07 | 2017-04-12 | 南京中车浦镇城轨车辆有限责任公司 | Compound mould of passenger train side wall stand |
| CN212019039U (en) * | 2019-12-06 | 2020-11-27 | 吉林省威创机电工程有限公司 | Axle distance rod mould of bending |
| CN212884292U (en) * | 2020-04-27 | 2021-04-06 | 上海凌云工业科技有限公司凌云汽车技术分公司 | Bending die for rolled profile of automobile window frame |
| CN213378809U (en) * | 2020-07-09 | 2021-06-08 | 隆昌山川机械有限责任公司 | Pipe bending forming die |
| CN213591491U (en) * | 2020-11-17 | 2021-07-02 | 南京雷尔伟新技术股份有限公司 | Side wall stand forming die |
-
2021
- 2021-08-08 CN CN202110905123.XA patent/CN113714396A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228921A (en) * | 2011-04-21 | 2011-11-02 | 吉林大学 | Method for forming aluminum alloy end wall column member for new-generation high-speed motor train unit |
| JP2015174145A (en) * | 2014-03-12 | 2015-10-05 | ジョンス キム | Rail molding equipment for sunroof panel |
| CN206083581U (en) * | 2016-07-07 | 2017-04-12 | 南京中车浦镇城轨车辆有限责任公司 | Compound mould of passenger train side wall stand |
| CN212019039U (en) * | 2019-12-06 | 2020-11-27 | 吉林省威创机电工程有限公司 | Axle distance rod mould of bending |
| CN212884292U (en) * | 2020-04-27 | 2021-04-06 | 上海凌云工业科技有限公司凌云汽车技术分公司 | Bending die for rolled profile of automobile window frame |
| CN213378809U (en) * | 2020-07-09 | 2021-06-08 | 隆昌山川机械有限责任公司 | Pipe bending forming die |
| CN213591491U (en) * | 2020-11-17 | 2021-07-02 | 南京雷尔伟新技术股份有限公司 | Side wall stand forming die |
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Application publication date: 20211130 |