CN109513763B - A method of manufacturing a U-shaped tube for a car seat back frame - Google Patents
A method of manufacturing a U-shaped tube for a car seat back frame Download PDFInfo
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- CN109513763B CN109513763B CN201910030347.3A CN201910030347A CN109513763B CN 109513763 B CN109513763 B CN 109513763B CN 201910030347 A CN201910030347 A CN 201910030347A CN 109513763 B CN109513763 B CN 109513763B
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- arc surface
- plane
- preformed
- concave arc
- mold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/21—Presses specially adapted for extruding metal
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chair Legs, Seat Parts, And Backrests (AREA)
- Seats For Vehicles (AREA)
Abstract
The utility model provides a make preforming mould of car seat back frame U type pipe, includes mould (1) and preforming lower mould (2) on the preforming, be equipped with die cavity (121) on the lower terminal surface of mould (1) on the preforming, install two preforming on briquetting (15) the rear end of going up die cavity (121), the lower terminal surface of briquetting (1) includes two concave planes on the preforming, is left plane (152), right plane (153) respectively to and connect transition arc surface (151) of left plane (152) and right plane (153), left plane (152) with contained angle scope between right plane (153) is 90 to 160, has solved the problem of collapsing in the middle of car seat back frame U type pipe welding plane.
Description
Technical Field
The invention relates to an automobile seat die, in particular to a method for manufacturing a U-shaped tube of an automobile seat backrest frame.
Background
The U-shaped pipe at the upper part of the automobile seat back frame is arranged on the automobile seat back frame, and a welding plane which is welded with the automobile seat headrest guide pipe is arranged on the U-shaped pipe at the upper part of the automobile seat back frame and is formed by one-time extrusion. The extrusion die comprises an upper die and a lower die, an upper pressing block is arranged in a cavity of the upper die, and the working end face of the upper pressing block is a plane. During extrusion molding, a line contact is formed between the working surface of the upper pressing block and the round steel pipe, the part of the arc surface, which is contacted with the upper pressing block, deforms, and as the arc surface has certain tension, the arc surfaces at the two sides of the deformed part are not synchronously deformed with the deformed part, so that the part of the arc surface, which is firstly extruded, is concave, and the problem that the middle of a welding plane is easy to collapse after extrusion in the actual manufacturing process is caused. The welding plane of the U-shaped pipe on the upper part of the automobile seat backrest frame and the local clearance between the U-shaped pipe and the automobile seat headrest guide pipe are increased, the local clearance is increased, and then the penetration of local welding spots is insufficient, so that the strength after welding is reduced, the depth of the collapse area of the welding plane is different, the welding is difficult, the situation that the automobile seat headrest guide pipe is welded through easily occurs in the welding process, the yield is lower, and in addition, in the welding process, independent welding is needed to be carried out on the collapse area, and the welding efficiency is affected.
Disclosure of Invention
The invention aims to provide a method for manufacturing a U-shaped tube of a backrest frame of an automobile seat without collapse.
A method for manufacturing a U-shaped pipe of a backrest frame of an automobile adopts a preformed mould for manufacturing the U-shaped pipe of the backrest frame of the automobile, the preformed mould for manufacturing the U-shaped pipe of the backrest frame of the automobile comprises a preformed upper mould and a preformed lower mould, a lower cavity corresponding to the outer contour of the U-shaped pipe of the backrest frame of the automobile to be processed is arranged on the upper end face of the preformed lower mould, two preformed lower pressing blocks are arranged at the rear end of the lower cavity, an upper cavity corresponding to the outer contour of the U-shaped pipe of the backrest frame of the automobile to be processed is arranged on the lower end face of the preformed upper mould, two preformed upper pressing blocks are arranged at the positions of the rear end of the upper cavity corresponding to the preformed lower pressing blocks, the upper end face of the preformed lower pressing block comprises a concave bottom arc surface and a left concave arc surface connected with the left end of the bottom arc surface, a right concave arc surface connected with the right end of the bottom arc surface, the lower end face of the preformed upper pressing block comprises two concave planes which are a left plane and a right plane respectively, and a transition arc surface connecting the left plane and the right plane, the radius of the transition arc surface is the same as the radius of the U-shaped tube outline of the backrest frame of the automobile to be processed, and the included angle between the left plane and the right plane ranges from 90 degrees to 160 degrees;
the lower end of the left plane is tangentially connected with a left concave arc surface, and the lower end of the right plane is tangentially connected with a right concave arc surface;
the transition arc surface is tangent to the left plane and the right plane respectively;
the axes of the left concave arc surface and the right concave arc surface are in the plane where the upper end plane of the preformed lower pressing block is located, and the axes of the left concave arc surface and the right concave arc surface are in the plane where the lower end plane of the preformed upper pressing block is located;
the axial distance between the left upper concave arc surface and the right upper concave arc surface is the same as the axial distance between the left lower concave arc surface and the right lower concave arc surface;
the method comprises the steps of pre-forming extrusion and forming extrusion, wherein the steps are as follows:
firstly, performing preforming extrusion, namely placing a U-shaped tube of a backrest frame of an automobile seat to be processed into a lower cavity of a preforming lower die, descending a preforming upper die until the lower end face of the preforming upper die is attached to the upper end face of the preforming lower die, loading 800KN-1000KN of pressure on the preforming upper die, keeping the pressure for at least 1.5s, ascending the preforming upper die after pressure unloading, and taking out a preformed product;
then, molding extrusion is carried out, the preformed U-shaped tube of the automobile seat backrest frame is placed into a lower cavity of a molding lower die, the molding upper die descends until the lower end face of the U-shaped tube is attached to the upper end face of the molding lower die, 800KN-1000KN of pressure is loaded on the molding upper die, the pressure holding time is at least 1.5s, after pressure unloading, the molding upper die ascends, and a molded extruded product is taken out.
Preferably, the radius of the transition arc surface is 12.7mm, the included angle range between the left plane and the right plane is 156 degrees, the axial distance between the left concave arc surface and the right concave arc surface is 26mm, and the radius of the left concave arc surface, the right concave arc surface, the left concave arc surface and the right concave arc surface is 2.6mm.
The invention discloses a preforming die for manufacturing a U-shaped pipe of a back rest of an automobile seat, which is characterized in that a left plane and a right plane which are concave on the lower end face of an upper pressing block are preformed, and a transitional arc surface for connecting the left plane and the right plane is used for enabling the preformed upper pressing block to form surface contact with the arc surface of the U-shaped pipe of the back rest of the automobile seat to be processed, so that local concave is not generated in the preforming extrusion process, and tension of the arc surface is eliminated through extrusion of the left plane and the right plane, so that a welding plane without concave can be obtained during forming extrusion.
According to the preforming die for manufacturing the U-shaped tube of the automobile seat backrest frame, the lower end of the left plane is tangentially connected with the left concave arc surface, the lower end of the right plane is tangentially connected with the right concave arc surface, so that the flowing and storage space of materials during extrusion molding is enlarged, and the problem of wrinkling caused by material extrusion is avoided.
Drawings
FIG. 1 is a front view of a U-tube of an automotive seat back frame;
FIG. 2 is an enlarged view of a portion of FIG. 1 at C;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a cross-sectional view B-B of FIG. 2;
FIG. 5 is a schematic view of a defective section of a U-tube of an automotive seat back frame;
FIG. 6 is a front view of a preform mold;
FIG. 7 is a D-D sectional view of FIG. 6;
FIG. 8 is a bottom view of the preform upper mold;
FIG. 9 is a top view of a preform lower die;
FIG. 10 is an enlarged partial view at E of FIG. 7;
FIG. 11 is an enlarged view of a portion of FIG. 7 at F;
FIG. 12 is a front view of a molding die;
FIG. 13 is a G-G cross-sectional view of FIG. 12;
FIG. 14 is an enlarged view of a portion of FIG. 13 at H;
fig. 15 is a partially enlarged view at I of fig. 13.
Description of the embodiments
As shown in fig. 1 to 4, the drawing sheet requires the welding plane 5 of the U-shaped tube of the back frame of the car seat to be a horizontal plane.
As shown in fig. 5, the cross-sectional defect condition of the welding plane 5 of the U-shaped tube of the back frame of the automobile seat manufactured in the prior art is shown.
As shown in fig. 6, 8 and 9, the pre-forming die comprises an upper pre-forming die 1 and a lower pre-forming die 2, the upper pre-forming die 1 comprises an upper bearing layer 11 and an upper cavity layer 12, an a threaded hole 111 penetrating through the upper end face and the lower end face is formed in the upper bearing layer 11, an a stepped hole 122 penetrating through the upper end face and the lower end face of the upper cavity layer 12 is formed in a position corresponding to the a threaded hole 111, the upper cavity layer 12 is connected below the upper bearing layer 1 through a stepped bolt 16 penetrating through the a stepped hole and matched with the a threaded hole in the upper bearing layer 11, the neck of the stepped bolt 16 is unthreaded, and the upper cavity layer 2 can move along the axial direction of the stepped bolt 16. The lower end surface of the upper cavity layer 12 is provided with an upper concave cavity 121, and the upper cavity layer 12 is also provided with a guide hole 123 penetrating through the upper end surface and the lower end surface thereof. The preformed lower die 2 comprises a lower pressure bearing layer 14 and a lower cavity layer 13, B threaded holes 141 penetrating through the upper end face and the lower end face are formed in the lower pressure bearing layer 14, B stepped holes 132 penetrating through the upper end face and the lower end face of the lower cavity layer 13 are formed in positions, corresponding to the B threaded holes 141, of the lower cavity layer 13, and the lower cavity layer 13 is connected above the lower pressure bearing layer 14 through stepped bolts 16 penetrating through the B stepped holes 132 and being matched with the B threaded holes 141 of the lower pressure bearing layer 14, so that the lower cavity layer 13 can move along the axial direction of the stepped bolts 16. The upper end face of the lower cavity layer 13 is provided with a concave lower cavity 131, the lower cavity layer 1 is also provided with a mounting hole penetrating through the upper end face and the lower end face of the lower cavity layer, a guide post 133 is fixed in the mounting hole through a fastening bolt 18, and the guide post 133 is matched with the guide hole 123 of the upper cavity layer 12 to guide the die assembly process of the upper preformed die 1 and the lower preformed die 2.
As shown in fig. 8, the overall profile of the upper cavity 121 corresponds to the outer profile of the U-shaped tube of the back frame of the car seat to be processed, and two pre-formed upper press blocks 15 are installed at the rear end of the upper cavity 121 at positions corresponding to the welding planes 5 shown in fig. 1 to 3. 4 stepped bolts 16 are connected between the upper cavity layer 12 and the upper bearing layer 11. 4 guide holes 123 are distributed at appropriate positions on the lower end surface of the upper cavity layer 12.
As shown in fig. 9, the overall contour of the lower cavity 131 corresponds to the outer contour of the U-shaped tube of the back frame of the car seat to be processed, and two pre-formed lower press blocks 17 are installed at the rear end portion of the lower cavity 131 at positions corresponding to the two pre-formed upper press blocks 15. 4 stepped bolts 16 are connected between the lower cavity layer 13 and the lower bearing layer 14. 4 guide posts 133 are installed on the upper end surface of the lower cavity layer 13 at positions corresponding to the guide holes 123 of the upper cavity layer 12.
As shown in fig. 7, the preformed upper press block 15 is attached to the lower end surface of the upper press layer 11 by countersunk screws 20 passing through the upper press layer 11. The preformed lower press block 17 is attached to the lower end face of the lower press layer 14 by countersunk screws 20 passing through the lower press layer 14. Cylindrical springs are respectively arranged between the upper cavity layer 12 and the upper bearing layer 11 and between the lower cavity layer 13 and the lower bearing layer 14
19, to reduce the impact between the upper cavity layer 12 and the upper bearing layer 11 and between the lower cavity layer 13 and the lower bearing layer 14 during die assembly, and to complete the separation and reset after die assembly.
As shown in fig. 10, the lower end surface of the preformed upper pressing block 15 is an upward concave inverted V-shaped curved surface, which comprises an upward concave left plane 152 and a right plane 153, the left plane 152 and the right plane 153 are symmetrically distributed left and right, the included angle between the left plane 152 and the right plane 153 is 156 degrees, any angle can be selected from 90 degrees to 160 degrees, the top ends of the left plane 152 and the right plane 153 are connected by a transitional arc surface 151 with a radius of 12.7mm tangential to the two planes, the preformed upper pressing block 15 can be changed into surface contact from line contact with a U-shaped pipe of a back rest of an automobile seat to be processed, the contact area is increased, and the concave occurrence of the U-shaped pipe of the back rest of the automobile seat to be processed in the preformed process is avoided. The included angle between the left plane 152 and the right plane 153 is set to 156 degrees, so that the arc surface of the U-shaped pipe of the automobile seat back frame to be processed can be extruded into a plane, the tension of the arc surface is eliminated, and the U-shaped pipe of the preformed automobile seat back frame is prevented from being sunken under the influence of the tension of the arc surface in the forming extrusion. The lower extreme of left plane 152 is tangent with upper left concave arc surface 154 and is connected, and the lower extreme of right plane 153 is tangent with upper right concave arc surface 155 and is connected, upper left concave arc surface 154 and upper right concave arc surface 155 link to each other with lower extreme plane 156, and upper left concave arc surface 154 and upper right concave arc surface 155's radius is 2.6mm, and upper left concave arc surface 154 and upper right concave arc surface 155's axis all are in the plane that lower extreme plane 156 of preforming upper briquetting 15 was located, and two axis interval is 26mm. The left concave circular arc surface 154 and the right concave circular arc surface 155 provide space for the flow and storage of the material during extrusion, and avoid folds caused by extrusion of the material.
As shown in fig. 11, the lower end surface of the preform lower pressing block 17 is a semicircular surface, the depth of the semicircular surface is 12.7mm, the radius of the bottom arc surface 171 is 12.7mm, the axis is in the plane of the upper end plane 176 of the preform lower pressing block 17, the left upper end of the bottom arc surface 171 is connected with the left concave arc surface 172, the right upper end of the bottom arc surface 171 is connected with the right concave arc surface 173, the radii of the left concave arc surface 172 and the right concave arc surface 173 are 2.6mm, the axes of the left concave arc surface 172 and the right concave arc surface 173 are in the plane of the upper end plane 176 of the preform lower pressing block 17, the distance between the two axes and the axis of the bottom arc surface 171 is 13mm, the connection between the left concave arc surface 172 and the bottom arc surface 171 is the left outer tangent arc surface 174 with the radius of 2mm, and the connection between the right concave arc surface 173 and the bottom arc surface 171 is the right outer tangent arc surface 175 with the radius of 2 mm.
As shown in fig. 12 to 15, the forming die is similar to the preform except that the lower end surface of the upper pressing block 15' is formed as a flat surface.
In the operation process, firstly, performing preforming extrusion, putting a to-be-processed automobile seat back frame U-shaped pipe into a lower cavity 131 of a preforming lower die 2, descending a preforming upper die 1 until the lower end surface of the preforming upper die is attached to the upper end surface of the preforming lower die 2, loading 800KN-1000KN of pressure on the preforming upper die 1, keeping the pressure for 2s, after pressure unloading, ascending the preforming upper die 1, and taking out the preformed automobile seat back frame U-shaped pipe;
then, molding extrusion is carried out, the preformed U-shaped tube of the automobile seat back frame is put into a lower cavity of a molding lower die 4, the molding upper die 3 descends until the lower end face of the preformed U-shaped tube is attached to the upper end face of the molding lower die 4, 800KN-1000KN of pressure is loaded on the molding upper die 3, the pressure is kept for 2s, after the pressure is unloaded, the molding upper die 3 ascends, and the molded U-shaped tube of the automobile seat back frame is taken out.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910030347.3A CN109513763B (en) | 2019-01-14 | 2019-01-14 | A method of manufacturing a U-shaped tube for a car seat back frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910030347.3A CN109513763B (en) | 2019-01-14 | 2019-01-14 | A method of manufacturing a U-shaped tube for a car seat back frame |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109513763A CN109513763A (en) | 2019-03-26 |
| CN109513763B true CN109513763B (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910030347.3A Active CN109513763B (en) | 2019-01-14 | 2019-01-14 | A method of manufacturing a U-shaped tube for a car seat back frame |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201082447Y (en) * | 2007-07-04 | 2008-07-09 | 西德科东昌汽车座椅技术有限公司 | Car seat backrest headrest plate mold |
| CN204711073U (en) * | 2015-07-03 | 2015-10-21 | 重庆众诚精密模锻有限公司 | A kind of Preform Die of spindle |
| WO2016084607A1 (en) * | 2014-11-25 | 2016-06-02 | Ｊｆｅスチール株式会社 | Method for manufacturing steel pipe and press mold used in said method |
| JP2017042814A (en) * | 2015-08-28 | 2017-03-02 | 株式会社三五 | Hydroforming machine |
| CN209577763U (en) * | 2019-01-14 | 2019-11-05 | 廊坊中德汽车座椅制造有限公司 | Manufacture the preforming tool of motor vehicle seat back frame U-tube |
-
2019
- 2019-01-14 CN CN201910030347.3A patent/CN109513763B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201082447Y (en) * | 2007-07-04 | 2008-07-09 | 西德科东昌汽车座椅技术有限公司 | Car seat backrest headrest plate mold |
| WO2016084607A1 (en) * | 2014-11-25 | 2016-06-02 | Ｊｆｅスチール株式会社 | Method for manufacturing steel pipe and press mold used in said method |
| CN204711073U (en) * | 2015-07-03 | 2015-10-21 | 重庆众诚精密模锻有限公司 | A kind of Preform Die of spindle |
| JP2017042814A (en) * | 2015-08-28 | 2017-03-02 | 株式会社三五 | Hydroforming machine |
| CN209577763U (en) * | 2019-01-14 | 2019-11-05 | 廊坊中德汽车座椅制造有限公司 | Manufacture the preforming tool of motor vehicle seat back frame U-tube |
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| Publication number | Publication date |
|---|---|
| CN109513763A (en) | 2019-03-26 |
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Effective date of registration: 20260109 Address after: 402160 Baiguo Road 58, Yongchuan District, Chongqing, with 2-7 Patentee after: Chongqing Dekang Automotive Parts Co.,Ltd. Country or region after: China Address before: 065803 Hebei Province, Langfang City, Wen'an Industrial New District (State-owned Xiaowu Farm) Patentee before: LANGFANG ZHONGDE AUTOMOTIVE SEAT MANUFACTURING CO.,LTD. Country or region before: China |