CN109013907B - Back extrusion process and die for molding thick plate body - Google Patents
Back extrusion process and die for molding thick plate body Download PDFInfo
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- CN109013907B CN109013907B CN201811076672.5A CN201811076672A CN109013907B CN 109013907 B CN109013907 B CN 109013907B CN 201811076672 A CN201811076672 A CN 201811076672A CN 109013907 B CN109013907 B CN 109013907B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000008569 process Effects 0.000 title claims abstract description 33
- 238000001125 extrusion Methods 0.000 title claims abstract description 26
- 238000000465 moulding Methods 0.000 title claims description 29
- 239000000463 material Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000008719 thickening Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 3
- 238000004886 process control Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
Classifications
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a back extrusion process and a die for forming a thick plate body, wherein the die comprises an upper die part and a lower die part, the die structurally adopts a flip-chip forming structure, and compared with a conventional die for positioning in a normal installation, the die structure for positioning the flip-chip outer contour is simpler in production operation steps. The process controls the small plane of the mounting hole and the height of the spigot in the stamping process of the spigot clutch cover by back extrusion molding, and changes the flowing mode of the metal material.
Description
Technical Field
The invention relates to the technical field of back forming of thick plate stamping parts, in particular to a back extrusion process and a die for forming thick plate bodies.
Background
The size of the mounting surface of the clutch cover and the height of the spigot are all the difficult parameters of the stamping process of the spigot type cover in the clutch industry. In the conventional process and the die structure, the improvement difficulty is high, and the production stability is not high. The structure of the product is shown in fig. 5, the outer arc R5 is smaller than the thickness of the product, and the conventional stamping process is difficult to meet the technical requirements. However, in the back extrusion molding process, the material is in a three-way pressure stress state, so that the flow of the metal material can be effectively controlled.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a back extrusion process and a die for forming a thick plate body, wherein the process can control the plane of a mounting hole and the height of a spigot in the stamping process of a spigot clutch cover.
The technical scheme for realizing the aim of the invention is as follows:
a back extrusion die for forming thick plates comprises an upper die part and a lower die part;
the upper die part comprises an upper die base, an upper base plate, an upper clamping plate, an upper die core base plate, an upper die core, a first upper forming block and a second upper forming block, wherein the upper base plate, the upper clamping plate, the upper die core base plate and the upper die core are sequentially arranged on the lower end face of the upper die base from top to bottom, and the first upper forming block and the second upper forming block are respectively arranged at two ends of the upper clamping plate, the upper die core base plate and the upper die core;
the lower die part adopts a frame structure and comprises a lower die holder, a lower base plate, lower clamping plates, lower die cores, a first lower forming block, a second lower forming block and a die frame, wherein the lower base plate is arranged on the upper end face of the lower die holder; the bottom of the lower mold core is provided with a push rod, and the push rod passes through the lower base plate and the lower mold base to be connected with a machine tool.
And a limit column, a guide sleeve seat and a guide column seat are respectively arranged between the upper die holder and the lower die holder.
The first upper forming block is a movable piece, a spring is arranged in the movable piece, and the spring is connected with the upper base plate through a constant-height sleeve, so that the pressing and pushing functions of the upper die part are realized.
The upper die holder is connected with the upper die core by sequentially penetrating through the upper base plate, the upper clamping plate and the upper die core base plate through screws, and is fixedly connected with the second upper forming block by penetrating through the upper base plate through screws.
Pins are arranged in the upper clamping plate, the upper die core base plate, the upper die core and the lower die core.
The first lower molding block, the second lower molding block, the third lower molding block and the mold frame are connected with the lower clamping plate through screws, and the lower clamping plate is connected with the lower mold base through screws penetrating through the lower base plate.
The upper clamping plate, the upper die core backing plate and the upper die core are internally provided with center alignment holes, and the lower die core is internally provided with center alignment holes corresponding to the upper die part.
A back extrusion process for forming a thick plate body specifically comprises the following steps:
1) Preforming the product to obtain the approximate outline of the product, and increasing the height of the product part, namely reserving volume compensation;
2) Reversely buckling a preformed product blank part on a reversely-formed die through the outer contour positioning of the product;
3) The die random bed sliding block descends, and an upper die core of the upper die part is contacted with a blank workpiece and is pressed on the lower die part;
4) The upper mold core of the upper mold part continues to move downwards, the first upper molding block and the second upper molding block of the upper mold part contact the molded surface of the product, when the molding is about to be completed, the step surface of the root of the second upper molding block contacts the cross section of the product, and along with the completion of the molding process, the reserved volume compensation amount in the preforming process forces the material to reversely flow back through the backward extrusion of the step of the root of the upper mold molding block, thereby realizing the local thickening and thickening of the material.
In the step 1), the height is 2.0-3.0mm.
The beneficial effects are that: according to the back extrusion process and the die for forming the thick plate body, the die structurally adopts the inverted forming structure, and compared with a conventional die with normal internal positioning, the die structure with inverted outer contour positioning is simpler and quicker in production operation steps. The process controls the small plane of the mounting hole and the height of the spigot in the stamping process of the spigot clutch cover by back extrusion molding, and changes the flowing mode of the metal material.
Drawings
FIG. 1 is a schematic diagram of a mold structure according to the present invention;
FIG. 2 is a schematic illustration of a preformed product article in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a back-extruded product part according to an embodiment of the present invention;
FIG. 4 is a schematic view showing a partial structure of a product formed in a mold according to an embodiment of the present invention;
FIG. 5 is a block diagram of a product as described in the background;
in the drawing, 1, an upper die holder 2, an equal-height sleeve, a spring 3, an upper base plate 4, an upper clamping plate 5, an upper die core base plate 6, an upper die core 7, a second upper forming block 8, a third lower forming block 9, a first lower forming block 10, a lower clamping plate 11, a first upper forming block 12, a die frame 13, a second lower forming block 14, a lower die core 15, a lower base plate 16, a lower die holder 17, a product 18, a limit post 19, a push rod 20, a screw 21, a pin 22, a center alignment hole 23, a guide sleeve seat 24 and a guide post seat.
Detailed Description
The invention is further illustrated, but not limited, by the following figures and examples.
Examples:
a back extrusion die for forming a thick plate, as shown in fig. 1, comprises an upper die part and a lower die part;
the upper die part comprises an upper die holder 1, an upper base plate 3, an upper clamping plate 4, an upper die core base plate 5, an upper die core 6, a first upper forming block 11 and a second upper forming block 7, wherein the upper base plate 3, the upper clamping plate 4, the upper die core base plate 5 and the upper die core 6 are sequentially arranged on the lower end surface of the upper die holder 1 from top to bottom, and the first upper forming block 11 and the second upper forming block 7 are respectively arranged at two ends of the upper clamping plate 4, the upper die core base plate 5 and the upper die core 6;
the lower die part comprises a lower die holder 16, a lower base plate 15, lower clamping plates 10, lower die cores 14, a first lower forming block 9 and a lower die frame 12, wherein the lower base plate 15 is arranged on the upper end face of the lower die holder 16, the lower die cores 14 are arranged on the upper end face of the lower base plate 15, the lower clamping plates 10 are further arranged on the upper end face of the lower base plate 15, the lower clamping plates 10 are respectively arranged on two sides of the lower die cores 14, the die frame 12 is further arranged on the upper end face of each lower clamping plate 10, a first lower forming block 9 and a second lower forming block 13 are further arranged between the die frame 12 and the lower die cores 14, and a third lower forming block 8 is further arranged on the first lower forming block 9; the bottom of the lower die core 14 is provided with a push rod 19, the push rod 19 passes through the lower base plate 15 and the lower die holder 16 to be connected with a machine tool, and power is provided for lifting of the lower die core 14, so that a pushing function is realized.
All the molding blocks of the lower mold part are fixed to the lower clamping plate 10 by the fixing action of the mold frame 12. The die frame 12 and the lower clamping plate 10 are hollow in a circular ring, and the lower die core 14 is arranged in the center of the die as a movable piece. The lower pad 15 is at the lowest end and protects the lower die holder 16.
A limiting post 18, a guide sleeve seat 23 and a guide post seat 24 are respectively arranged between the upper die holder 1 and the lower die holder 16.
The first upper forming block 11 is a movable part, a spring is arranged in the movable part, and the spring is connected with the upper base plate 3 through the equal-height sleeve 2, so that the pressing and pushing functions of the upper die part are realized.
The upper die holder 1 sequentially passes through the upper base plate 3, the upper clamping plate 4 and the upper die core base plate 5 through screws to be connected with the upper die core 6, and the upper die holder 1 also passes through the upper base plate 3 through screws to be fixedly connected with the second upper forming block 7.
The upper clamping plate 4, the upper mold core base plate 5 and the upper mold core 6 are internally provided with pins 21.
The first lower forming block 9, the second lower forming block 13, the third lower forming block 8 and the die frame 12 are connected with the lower clamping plate 10 through screws, and the lower clamping plate 10 is connected with the lower die holder 16 through screws penetrating through the lower base plate 15.
The upper clamping plate 4, the upper die core backing plate 5 and the upper die core 6 are internally provided with center alignment holes 22, and the lower die core 14 is internally provided with center alignment holes 22 corresponding to the upper die part.
A back extrusion process for forming a thick plate body specifically comprises the following steps:
1) Preforming the product to obtain the approximate outline of the product, and pulling up the height of the product piece to be 2.0-3.0mm, namely reserving volume compensation quantity, as shown in figure 2;
2) Reversely buckling a preformed product blank part on a reversely-formed die through the outer contour positioning of the product;
3) The die random bed sliding block descends, and a first upper forming block 11 of the upper die part is firstly contacted with a blank workpiece and is pressed on the lower die part;
4) The first upper molding block 11 of the upper mold part continues to move downwards, the second upper molding block 7 of the upper mold part and the upper mold core 6 contact the molded surface of the product, when the molding is about to be completed in the molding process, the step surface at the root of the second upper molding block 7 contacts the cross section of the product workpiece, and along with the completion of the molding process, the reserved volume compensation amount in the preforming process forces the material to reversely flow back through the backward extrusion of the step at the root of the second upper molding block 7, so that the partial thickening and thickening of the material are realized, as shown in fig. 3.
In the molding process, as shown in fig. 4, the product piece 17 is located between the upper die part and the lower die part, the second upper molding block 7 is fixed on the upper base plate, the upper die base plate and other parts are locked on the machine tool slide block, the first upper molding block 11 is a movable part, and the first upper molding block is connected with the upper die through a spring and other parts. The first lower forming block 9 is connected with the lower clamping plate 10 through a screw 20, the lower clamping plate is connected with the lower base plate 15 through the screw 20, the die frame 12 is connected with the lower die holder 16 through the screw 20 and the lower clamping plate 10, and the die frame is locked on a machine tool workbench. The lower die core 14 is a movable part, and material returning is realized through a machine tool ejector rod 19.
Claims (8)
1. The back extrusion process for forming the thick plate body is characterized in that the thick plate body is formed by adopting a back extrusion die, the back extrusion die comprises an upper die part and a lower die part, the upper die part comprises an upper die base, an upper base plate, an upper clamping plate, an upper die core base plate, an upper die core, a first upper forming block and a second upper forming block, the lower end face of the upper die base is sequentially provided with the upper base plate, the upper clamping plate, the upper die core base plate and the upper die core from top to bottom, and the two ends of the upper clamping plate, the upper die core base plate and the upper die core are respectively provided with the first upper forming block and the second upper forming block;
the lower die part adopts a frame structure and comprises a lower die holder, a lower base plate, lower clamping plates, lower die cores, a first lower forming block, a second lower forming block and a die frame, wherein the lower base plate is arranged on the upper end face of the lower die holder; the bottom of the lower die core is provided with a push rod, and the push rod passes through the lower base plate and the lower die holder to be connected with a machine tool;
the back extrusion process for forming the thick plate body comprises the following steps:
1) Preforming the product to obtain the approximate outline of the product, and increasing the height of the product part, namely reserving volume compensation;
2) Reversely buckling a preformed product blank part on a reversely-formed die through the outer contour positioning of the product;
3) The die random bed sliding block descends, and a first upper forming block of the upper die part is contacted with a blank part and is pressed on the lower die part;
4) The first upper molding block of the upper mold part continuously descends, the second upper molding block of the upper mold part and the upper mold core contact the molded surface of the product, when the molding is about to be completed, the step surface of the root of the second upper molding block contacts the cross section of the product, along with the completion of the molding process, the reserved volume compensation amount in the preforming process forces the material to reversely flow back through the backward extrusion of the step of the root of the upper mold molding block, thereby realizing the local thickening and thickening of the material.
2. The back extrusion process for forming thick plate bodies according to claim 1, wherein a limit post, a guide sleeve seat and a guide post seat are respectively arranged between the upper die holder and the lower die holder.
3. The back extrusion process for forming thick plate bodies according to claim 1, wherein the first upper forming block is a movable piece, a spring is arranged in the movable piece, and the spring is connected with the upper base plate through a constant-height sleeve.
4. The back extrusion process for forming thick plate bodies according to claim 1, wherein the upper die holder is connected with the upper die core by sequentially penetrating through the upper base plate, the upper clamping plate and the upper die core base plate through screws, and the upper die holder is fixedly connected with the second upper forming block through the upper base plate through screws.
5. The back extrusion process for forming thick plate bodies according to claim 1, wherein pins are arranged in the upper clamping plate, the upper die core base plate, the upper die core and the lower die core.
6. The back extrusion process for forming thick plate bodies according to claim 1, wherein the first lower forming block, the second lower forming block, the third lower forming block and the die frame are connected with a lower clamping plate through screws, and the lower clamping plate is connected with a lower die holder through screws penetrating through a lower base plate.
7. The back extrusion process for forming thick plate body according to claim 1, wherein the upper clamping plate, the upper die core backing plate and the upper die core are provided with center alignment holes, and the lower die core is also provided with center alignment holes corresponding to the upper die part.
8. The process according to claim 1, wherein in step 1), the height is 2.0-3.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811076672.5A CN109013907B (en) | 2018-09-14 | 2018-09-14 | Back extrusion process and die for molding thick plate body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811076672.5A CN109013907B (en) | 2018-09-14 | 2018-09-14 | Back extrusion process and die for molding thick plate body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109013907A CN109013907A (en) | 2018-12-18 |
| CN109013907B true CN109013907B (en) | 2023-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811076672.5A Active CN109013907B (en) | 2018-09-14 | 2018-09-14 | Back extrusion process and die for molding thick plate body |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020146986A1 (en) * | 2019-01-14 | 2020-07-23 | 深圳配天智能技术研究院有限公司 | Extrusion shaping assembly, laminated film shaping system and laminated film shaping method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598346A (en) * | 2004-09-06 | 2005-03-23 | 贵州大学 | Method of manufacturing star gear for overdrive clutch |
| JP2006312175A (en) * | 2005-05-06 | 2006-11-16 | Konan Technics Kk | Positioning tool, die assembly and press device |
| CN202479252U (en) * | 2012-03-23 | 2012-10-10 | 河池学院 | Backward extrusion die for aluminum alloy wheel rim of oversize vehicle |
| CN103624148A (en) * | 2012-08-21 | 2014-03-12 | 欧自成 | Cold extrusion die for intermediate gear of one-way clutch |
| CN203565680U (en) * | 2013-12-03 | 2014-04-30 | 天津宇傲工程机械有限公司 | Stamping die for mounting plate of car ventilation cover plate |
| CN104826906A (en) * | 2014-11-27 | 2015-08-12 | 北汽福田汽车股份有限公司 | Workpiece flange forming method and mould |
| CN106216501A (en) * | 2016-08-11 | 2016-12-14 | 上海新朋金属制品有限公司 | The flange hole technology of a kind of slab raising bag backward extrusion and mould thereof |
-
2018
- 2018-09-14 CN CN201811076672.5A patent/CN109013907B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598346A (en) * | 2004-09-06 | 2005-03-23 | 贵州大学 | Method of manufacturing star gear for overdrive clutch |
| JP2006312175A (en) * | 2005-05-06 | 2006-11-16 | Konan Technics Kk | Positioning tool, die assembly and press device |
| CN202479252U (en) * | 2012-03-23 | 2012-10-10 | 河池学院 | Backward extrusion die for aluminum alloy wheel rim of oversize vehicle |
| CN103624148A (en) * | 2012-08-21 | 2014-03-12 | 欧自成 | Cold extrusion die for intermediate gear of one-way clutch |
| CN203565680U (en) * | 2013-12-03 | 2014-04-30 | 天津宇傲工程机械有限公司 | Stamping die for mounting plate of car ventilation cover plate |
| CN104826906A (en) * | 2014-11-27 | 2015-08-12 | 北汽福田汽车股份有限公司 | Workpiece flange forming method and mould |
| CN106216501A (en) * | 2016-08-11 | 2016-12-14 | 上海新朋金属制品有限公司 | The flange hole technology of a kind of slab raising bag backward extrusion and mould thereof |
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| Publication number | Publication date |
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| CN109013907A (en) | 2018-12-18 |
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