CN114472661A - Multidirectional stretching integral forming die and method for sheet metal part - Google Patents
Multidirectional stretching integral forming die and method for sheet metal part Download PDFInfo
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- CN114472661A CN114472661A CN202111630005.9A CN202111630005A CN114472661A CN 114472661 A CN114472661 A CN 114472661A CN 202111630005 A CN202111630005 A CN 202111630005A CN 114472661 A CN114472661 A CN 114472661A
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- 239000002184 metal Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000003825 pressing Methods 0.000 claims abstract description 39
- 238000012856 packing Methods 0.000 claims description 25
- 230000006835 compression Effects 0.000 claims description 22
- 238000007906 compression Methods 0.000 claims description 22
- 230000001788 irregular Effects 0.000 claims description 12
- 238000010009 beating Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 206010040954 Skin wrinkling Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/24—Deep-drawing involving two drawing operations having effects in opposite directions with respect to the blank
-
- 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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a multidirectional extending integral forming die of a sheet metal part and a method thereof. The multi-directional drawing forming device solves the problem of multiple pressing of the integral forming of the multi-characteristic sheet metal part, can integrally form the multi-directional characteristic of the sheet metal part, avoids the forming process of firstly half-drawing forming and then integral welding, and is suitable for the integral drawing forming of the sheet metal part with the multi-directional characteristic.
Description
Technical Field
The invention belongs to the technical field of sheet metal processing, and relates to a multidirectional extending integral forming die and a multidirectional extending integral forming method for sheet metal parts.
Background
With the development of science and technology, parts of a plurality of novel products are developed in the directions of light weight, complication and integration, irregular complex-profile thin-wall components are adopted more and more, the forming characteristics of parts meet the use requirements of the parts, and the structural design is diversified, irregular and multidirectional. The characteristic direction of part of parts points to the outside from the inside of the part, and is perpendicular to the stroke direction of the press, and is limited by the azimuth shape, the part can only be split into a plurality of parts for meeting the requirement of part sheet metal forming, and then the parts are integrally welded after being formed respectively, so that the welding requirement is high, the unqualified risk of the parts is increased, and the processing cost and the production period of the parts are increased.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and a multidirectional stretching integral forming die and a multidirectional stretching integral forming method for sheet metal parts are provided.
The technical scheme of the invention is as follows:
a multidirectional stretching integral forming die for sheet metal parts comprises a base plate, a base, a pressure plate, a female die, a guide pillar, a male die, a lengthened ejector rod, an inclined wedge, a press-wrapping male die, a compression spring, a plug, a fixing plate, a hydraulic cylinder and a connecting block;
the base is of a rectangular structure and is fixed on the base plate, and each corner of the base is fixed with one guide pillar; the other end of the guide post penetrates through the material pressing plate, one end of the lengthened ejector rod is fixed on the material pressing plate, the other end of the lengthened ejector rod penetrates through the base and the base plate and then is connected with an ejection cylinder of the oil press, the ejection cylinder of the oil press pushes the lengthened ejector rod to move up and down, and the material pressing plate is driven by the lengthened ejector rod to move up and down along the guide post;
the male die is used for forming the inner profile of the sheet metal part and is arranged on the base, the pressure plate is provided with an opening, and when the pressure plate moves downwards, the male die can extend out of the opening; the female die is used for forming the outer profile of the sheet metal part;
the fixed plate is fixed at the bottom of the cavity of the convex mold through a third inner hexagon bolt, the inclined wedge is placed on the fixed plate, a connecting block is arranged at the bottom of the inclined wedge, the connecting block is installed on an ejector rod of a hydraulic cylinder, the hydraulic cylinder is placed on a base plate, and the inclined wedge is driven to move up and down through the up-and-down movement of the hydraulic cylinder; a hole is processed on the inner wall of the male die, a pressing and wrapping male die is placed in the hole, and the pressing and wrapping male die is used for forming an irregular curved surface circular bulge on the sheet metal part; the pressing and wrapping male die is provided with an oblong through hole, an inner hexagon screw penetrates through the through hole on the pressing and wrapping male die to fix the pressing and wrapping male die on the male die, a plug is fixed in the male die, one end of a compression spring is fixed on the plug, the other end of the compression spring is fixed on the pressing and wrapping male die, the pressing and wrapping male die protrudes out of the outer surface of the male die when the compression spring is stressed and compressed, and the pressing and wrapping male die is received in the male die when the compression spring is in a free state;
the inclined plane on the inclined wedge is matched with the packing convex die, when the inclined wedge moves upwards, the packing convex die can be driven to move outwards together, and at the moment, the compression spring is in a compression state.
And a first lifting bolt is arranged on the female die, a second lifting bolt is arranged on the backing plate, and the first lifting bolt and the second lifting bolt are used for lifting the tool.
The number of the press-wrapping convex dies is consistent with that of the irregular curved surface circular bulges on the sheet metal part, and the positions of the press-wrapping convex dies are determined according to the positions of the irregular curved surface circular bulges on the sheet metal part.
The length of the long circular through hole on the press-wrapping convex die controls the movement stroke of the press-wrapping convex die.
The shape of the pressing and packing convex die is consistent with the size of the hole of the convex die, the pressing and packing convex die retracts into the convex die cavity in a non-working state, and the pressing and packing convex die moves outwards under the pushing of the inclined wedges in working.
The forming method of the multidirectional extending integral forming die for the sheet metal part comprises the following steps:
firstly, fixing a die on a platform of a double-acting oil press, wherein the die adopts an inverted structure, when the die is in a die opening state, a female die is fixed on an upper platform of the oil press, a backing plate is fixed on a lower platform of the oil press, an elongated ejector rod ejects a pressure plate under the action of a lower ejection cylinder of the oil press, so that the upper plane of the pressure plate is flush with the upper plane of a male die, a plate to be formed is placed on the pressure plate, the upper platform of the oil press is started to drive the female die to move downwards, when the pressure plate moves downwards to the position of the pressure plate, the lower ejection cylinder of the oil press moves downwards simultaneously, the female die and the pressure plate press the plate to be formed to continue to move downwards, the male die starts to extend and form in the up-down direction under the action of a blank pressing force, when the pressure plate moves downwards to the bottom, the up-down extension and the up-down formation of the inner profile of a sheet metal part is completed, the formed part is completely adhered to the male die and is pressed by the female die;
starting a hydraulic cylinder placed on the base plate, driving the inclined wedge to move upwards, pushing a packing convex die positioned in the convex die out of the molded surface of the convex die under the pushing of the inclined wedge, starting to extend and form in the directions of two sides vertical to the die closing direction, after the two-side extending and forming is finished, moving the hydraulic cylinder downwards, pulling the inclined wedge to move downwards by a connecting block fixed on the hydraulic cylinder, and returning the packing convex die to a hole in the side wall of the cavity of the convex die under the action of a compression spring;
and after the forming process is finished, the upper platform of the oil press moves upwards to drive the female die to move upwards, the formed part is left in the female die, and the part is taken out after the die is completely opened.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention completes the multi-direction extension integral forming of the sheet metal part through the die, the die is designed to be an inverted structure, the ejection cylinder of the double-acting oil press provides the blank holder force required by the extension forming in the first step, the vertical extension forming is completed under the action of the oil press, the blank holder force required by the extension forming in the second step is provided by the die assembly force of the die, and the outsourcing hydraulic cylinder is adopted to provide the main force of the double-side forming.
(2) The multi-directional drawing forming device solves the problem of multiple pressing of the integral forming of the multi-characteristic sheet metal part, can integrally form the multi-directional characteristic of the sheet metal part, avoids the forming process of firstly half-drawing forming and then integral welding, and is suitable for the integral drawing forming of the sheet metal part with the multi-directional characteristic.
Drawings
FIG. 1 is a schematic view of a typical irregular-surface sheet metal part with multidirectional stretch forming features;
FIG. 2 is a schematic view of the mold in an open state;
fig. 3 is a schematic view of the inside of the male mold.
Detailed Description
The invention is further elucidated with reference to the drawing.
The invention solves the problem of multidirectional stretching forming of sheet metal parts, realizes twice blank pressing on a double-acting oil press and twice stretching forming in different directions, can form the multidirectional characteristic of the sheet metal part at one time, does not need to adopt a forming process of firstly half stretching forming and then integral welding, and is suitable for integral stretching forming of the sheet metal part with the multidirectional characteristic.
Example (b):
FIG. 1 shows a typical sheet metal part having a multidirectional stretch-forming characteristic and being 1Cr18Ni9Ti, having a wall thickness of 0.8, and having the overall dimensions shown in FIG. 1 as an irregular convergent surface, a maximum depth 170, and a maximum opening width 130. There are the protruding characteristic 4 departments of asymmetric position on part both sides, and the characteristic shape is inequality on both sides, is irregular curved surface circular arch, and the highest point is according to curved surface 15.
The forming of the parts is specifically completed by a set of extension forming dies. The die comprises a base plate 1, a base 2, a pressure plate 3, a female die 4, a first lifting bolt 5, a second lifting bolt 6, a nut 7, a guide pillar 8, a male die 9, a first inner hexagonal bolt 10, a lengthened ejector rod 11, a wedge 12, a first press-covering male die 13, a compression spring 14, a second inner hexagonal screw 15, a second press-covering male die 16, a plug 17, a fixing plate 18, a third inner hexagonal bolt 19, a hydraulic cylinder 20, a connecting block 21 and a fourth inner hexagonal bolt 22.
The female die 4 is provided with a first lifting bolt 5, the base plate 1 is provided with a second lifting bolt 6, and the first lifting bolt 5 and the second lifting bolt 6 are used for hoisting a tool.
The male die 9 is used for forming the inner profile of the sheet metal part and is arranged on the base 2, the pressure plate 3 is provided with an opening, and when the pressure plate 3 moves downwards, the male die 9 can extend out of the opening.
The female die 4 is used for forming the outer molded surface of the sheet metal part. The first press-packing convex die 13, the second press-packing convex die 16, the third press-packing convex die and the fourth press-packing convex die (the third press-packing convex die and the fourth press-packing convex die are not shown in the figure) are used for forming the irregular curved surface circular bulges on the sheet metal parts.
The fixed plate 18 is fixed at the bottom of the cavity of the male die 9 through a third hexagon socket head cap screw 19, and the inclined wedge 12 is placed on the fixed plate 18. A hole is processed on the inner wall of the male die 9, a pressing and wrapping male die is placed in the hole, and the pressing and wrapping male die is used for forming an irregular curved surface circular bulge on the sheet metal part; the pressing and wrapping male die is provided with an oblong through hole, an inner hexagonal screw penetrates through the through hole in the pressing and wrapping male die to fix the pressing and wrapping male die on the male die 9, the plug 17 is fixed in the male die 9, one end of the compression spring 14 is fixed on the plug 17, the other end of the compression spring is fixed on the pressing and wrapping male die, when the compression spring 14 is compressed under stress, the pressing and wrapping male die protrudes out of the outer surface of the male die, and when the compression spring 14 is in a free state, the pressing and wrapping male die is received in the male die.
The inclined plane on the inclined wedge 12 is matched with the packing convex die, and when the inclined wedge 12 moves upwards, the packing convex die can be driven to move outwards together, and at the moment, the compression spring 14 is in a compressed state. The bottom of the inclined wedge 12 is provided with a connecting block 21, the connecting block 21 is installed on an ejection rod of the hydraulic cylinder 20, and the inclined wedge 12 is driven to move up and down by the up-and-down movement of the hydraulic cylinder 20. The hydraulic cylinder 20 is fixed to the pad 1.
The inner hexagonal screw penetrates through the long circular through hole in the pressing and wrapping convex die to fix the pressing and wrapping convex die on the convex die 9, and the length of the long circular through hole is 20 to control the movement stroke of the pressing and wrapping convex die.
The shape of the press-packing convex die is consistent with the size of the hole of the convex die 9, the press-packing convex die retracts into the cavity of the convex die 9 in a non-working state, and the press-packing convex die is pushed by the inclined wedges 12 to move outwards in working.
The forming method using the die comprises the following steps:
firstly, fixing a mould on a platform of a double-acting oil press, wherein the mould adopts an inverted structure, when the mould is in a mould opening state, as shown in figure 2, a female mould 4 is fixed on an upper platform of oil press equipment, a backing plate 1 is fixed on a lower platform of the oil press, a lengthened ejector rod 11 ejects a pressure plate 3 under the action of a lower ejection cylinder of the oil press, so that the upper plane of the pressure plate 3 is flush with the upper plane of a male mould 9, a plate to be formed is placed on the pressure plate, the upper platform of the oil press is started to drive the female mould 4 to move downwards, when the pressure plate 3 moves downwards, the lower ejection cylinder of the oil press simultaneously moves downwards, the female mould 4 and the pressure plate 3 press the plate to be formed to continue to move downwards, under the action of a blank holding force, the male mould 9 starts to extend and form in the up-down direction, the pressure plate 3 moves downwards to the bottom, at the moment, the part finishes extending and is completely attached to the male mould 9 after forming, pressed by the female die 4.
At this time, as shown in fig. 3, the hydraulic cylinder 20 placed on the base plate 1 is started, the upper platform of the hydraulic cylinder 20 moves upwards to drive the inclined wedge 12 to move upwards, the covering punch positioned in the convex die is ejected out of the molded surface of the convex die under the pushing of the inclined wedge, and the stretching forming is started in the direction perpendicular to the two sides of the die assembly direction, at this time, the blank can obtain enough blank holding force due to being pressed in the cavity, the lateral forming of the part avoids the risk of wrinkling, after the completion of the bilateral stretching forming, the hydraulic cylinder 20 moves downwards, the connecting block 21 fixed on the oil hydraulic cylinder pulls the inclined wedge 12 to move downwards, and the covering punch positioned in the convex die returns to the cavity of the convex die 9 under the action of the compression spring 14. At the moment, the forming process is finished, the upper platform of the oil press moves upwards to drive the female die 4 to move upwards, the formed part is left in the female die 4, and the part is taken out after the die is completely opened.
The invention completes the multi-direction extension integral forming of the sheet metal part through the die, the die is designed to be an inverted structure, the ejection cylinder of the double-acting oil press provides the blank holder force required by the extension forming in the first step, the vertical extension forming is completed under the action of the oil press, the blank holder force required by the extension forming in the second step is provided by the die assembly force, and the outsourcing liquid oil cylinder is adopted to provide the main force of the double-side forming.
The design scheme of the die completes the multidirectional extending integral forming of the sheet metal part. The multi-directional drawing forming device solves the problem of multiple pressing of multi-feature sheet metal part integral forming, can integrally form the multi-directional feature of the sheet metal part, avoids the forming process of firstly half drawing forming and then integral welding, and is suitable for integral drawing forming of the sheet metal part with the multi-directional feature.
The invention solves the pressing problem of integral forming of multi-feature sheet metal parts, can integrally form the multi-directional features of the sheet metal parts, does not need to adopt a forming process of firstly half-stretching forming and then integral welding, and is suitable for integral stretching forming of the sheet metal parts with the multi-directional features.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (6)
1. The utility model provides a multidirectional extension integrated into one piece mould of panel beating part which characterized in that: the device comprises a base plate (1), a base (2), a pressure plate (3), a female die (4), a guide post (8), a male die (9), a lengthened ejector rod (11), an inclined wedge (12), a press-packed male die, a compression spring (14), a plug (17), a fixing plate (18), a hydraulic cylinder (20) and a connecting block (21);
the base (2) is of a rectangular structure and is fixed on the base plate (1), and a guide post (8) is fixed at each corner of the base (2); the other end of the guide post (8) penetrates through the pressure plate (3), one end of the lengthened ejector rod (11) is fixed on the pressure plate (3), the other end of the lengthened ejector rod penetrates through the base (2) and the base plate (1) and then is connected with an ejection cylinder of the oil press, the ejection cylinder of the oil press pushes the lengthened ejector rod (11) to move up and down, and the pressure plate (3) is driven by the lengthened ejector rod (11) to move up and down along the guide post (8);
the male die (9) is used for forming an inner molded surface of a sheet metal part and is arranged on the base (2), an opening is formed in the pressure plate (3), and when the pressure plate (3) moves downwards, the male die (9) can extend out of the opening; the female die (4) is used for forming the outer profile of the sheet metal part;
the fixing plate (18) is fixed at the bottom of a cavity of the male die (9) through a third inner hexagonal bolt (19), the inclined wedge (12) is placed on the fixing plate (18), a connecting block (21) is arranged at the bottom of the inclined wedge (12), the connecting block (21) is installed on an ejection rod of a hydraulic cylinder (20), the hydraulic cylinder (20) is placed on the base plate (1), and the inclined wedge (12) is driven to move up and down through the up-and-down movement of the hydraulic cylinder (20); a hole is processed on the inner wall of the male die (9), a pressing and wrapping male die is placed in the hole and used for forming an irregular curved surface circular bulge on the sheet metal part; the pressing and wrapping male die is provided with an oblong through hole, an inner hexagonal screw penetrates through the through hole in the pressing and wrapping male die to fix the pressing and wrapping male die on the male die (9), a plug (17) is fixed in the male die (9), one end of a compression spring (14) is fixed on the plug (17), the other end of the compression spring is fixed on the pressing and wrapping male die, when the compression spring (14) is stressed and compressed, the pressing and wrapping male die protrudes out of the outer surface of the male die (9), and when the compression spring (14) is in a free state, the pressing and wrapping male die is received in the male die (9);
the inclined plane on the inclined wedge (12) is matched with the packing convex die, when the inclined wedge (12) moves upwards, the packing convex die can be driven to move outwards together, and at the moment, the compression spring (14) is in a compressed state.
2. The multidirectional extending integral forming die for sheet metal parts as claimed in claim 1, wherein: the die (4) is provided with a first lifting bolt (5), the base plate (1) is provided with a second lifting bolt (6), and the first lifting bolt (5) and the second lifting bolt (6) are used for hoisting a tool.
3. The multidirectional extending integral forming die for sheet metal parts as claimed in claim 1, wherein: the number of the press-wrapping convex dies is consistent with that of the irregular curved surface circular bulges on the sheet metal part, and the positions of the press-wrapping convex dies are determined according to the positions of the irregular curved surface circular bulges on the sheet metal part.
4. The multidirectional extending integral forming die for sheet metal parts as claimed in claim 1, wherein: the length of the long circular through hole on the press-wrapping convex die is 20, and the movement stroke of the press-wrapping convex die is controlled.
5. The multidirectional extending integral forming die for sheet metal parts as claimed in claim 1, wherein: the shape of the press-packing convex die is consistent with the size of the hole of the convex die (9), the press-packing convex die retracts into the cavity of the convex die (9) in a non-working state, and the press-packing convex die moves outwards under the pushing of the inclined wedge (12) in working.
6. The forming method of the multidirectional extending integral forming die for the sheet metal part, which is applied to any one of the claims 1 to 5, is characterized by comprising the following steps:
firstly, fixing a die on a platform of a double-acting oil press, wherein the die adopts an inverted structure, when the die is in a die opening state, a female die is fixed on an upper platform of the oil press, a backing plate is fixed on a lower platform of the oil press, an extended ejector rod ejects a pressure plate under the action of a lower ejection cylinder of the oil press, so that the upper plane of the pressure plate is flush with the upper plane of a male die, a plate to be formed is placed on the pressure plate, the upper platform of the oil press is started to drive the female die to move downwards, when the pressure plate moves downwards to the position of the pressure plate, the lower ejection cylinder of the oil press moves downwards simultaneously, the female die and the pressure plate press the plate to be formed to continue to move downwards, under the action of a blank pressing force, the male die starts to extend and form in the up-down direction, when the pressure plate moves downwards to the bottom, the extend and form in the up-down direction of the inner profile of a sheet metal part is completed, and the formed part is completely adhered to the male die and is pressed by the female die;
starting a hydraulic cylinder placed on the base plate, driving the inclined wedge to move upwards, pushing a packing convex die positioned in the convex die out of the molded surface of the convex die under the pushing of the inclined wedge, starting to extend and form in the directions of two sides vertical to the die closing direction, after the two-side extending and forming is finished, moving the hydraulic cylinder downwards, pulling the inclined wedge to move downwards by a connecting block fixed on the hydraulic cylinder, and returning the packing convex die to a hole in the side wall of the cavity of the convex die under the action of a compression spring;
and after the forming process is finished, the upper platform of the oil press moves upwards to drive the female die to move upwards, the formed part is left in the female die, and the part is taken out after the die is completely opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111630005.9A CN114472661B (en) | 2021-12-28 | 2021-12-28 | Multidirectional extension integral forming die and method for sheet metal part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111630005.9A CN114472661B (en) | 2021-12-28 | 2021-12-28 | Multidirectional extension integral forming die and method for sheet metal part |
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| CN114472661A true CN114472661A (en) | 2022-05-13 |
| CN114472661B CN114472661B (en) | 2024-10-18 |
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| CN112719019A (en) * | 2020-12-11 | 2021-04-30 | 北京航星机器制造有限公司 | Double-side stretching forming method and forming device |
| CN113059016A (en) * | 2021-03-16 | 2021-07-02 | 中北大学 | Thinning, stretching and extruding composite forming die for large-height-diameter ratio cylinder |
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2021
- 2021-12-28 CN CN202111630005.9A patent/CN114472661B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH564386A5 (en) * | 1973-03-08 | 1975-07-31 | Styner & Bienz Ag | Press tool stripper plate and ejection pad - is made from polyurethane foam to reduce overall tool height and setting up time |
| US20180141106A1 (en) * | 2011-10-17 | 2018-05-24 | Standard Lifters, Inc. | Modular pilot assembly with self-contained stripper and method for metal forming dies |
| CN103128175A (en) * | 2013-03-15 | 2013-06-05 | 海洋世纪（青岛）精密制品有限公司 | Drawing mould with connected cambered surfaces |
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| CN109692907A (en) * | 2019-01-08 | 2019-04-30 | 中北大学 | A kind of more inner ring muscle rotary extrusion forming methods of cylindrical member |
| CN112719019A (en) * | 2020-12-11 | 2021-04-30 | 北京航星机器制造有限公司 | Double-side stretching forming method and forming device |
| CN113059016A (en) * | 2021-03-16 | 2021-07-02 | 中北大学 | Thinning, stretching and extruding composite forming die for large-height-diameter ratio cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114472661B (en) | 2024-10-18 |
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