CN107755445B - Extension and extrusion forming die and method for box-shaped piece with special-shaped structure - Google Patents
Extension and extrusion forming die and method for box-shaped piece with special-shaped structure Download PDFInfo
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- CN107755445B CN107755445B CN201710977685.9A CN201710977685A CN107755445B CN 107755445 B CN107755445 B CN 107755445B CN 201710977685 A CN201710977685 A CN 201710977685A CN 107755445 B CN107755445 B CN 107755445B
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- female die
- extension
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- 238000001125 extrusion Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000003825 pressing Methods 0.000 claims description 48
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 5
- 238000004512 die casting Methods 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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 OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/14—Making other products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, 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
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
- B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
Abstract
The invention discloses an extension and extrusion forming die for a box-shaped member with a special-shaped structure, which comprises an extension die A, an extension die B and an extrusion die, and also discloses a forming method for the box-shaped member with the special-shaped thin wall. The beneficial effects of the invention are as follows: the blank is convenient to take, the forming efficiency is high, the clear angle of the conical opening is formed, the dimensional accuracy is high, and the product consistency is high.
Description
Technical Field
The invention relates to the technical field of forming of box-shaped parts with special-shaped structures, in particular to a die and a method for extending and extruding the box-shaped parts with the special-shaped structures.
Background
The special-shaped thin-wall box-shaped part is made of pure aluminum 1060 and is formed by adding a deep and long inner cavity into an inclined conical inner cavity with a flange, as shown in fig. 1-3, the special-shaped thin-wall box-shaped part is a structural schematic diagram, and comprises a main body part (33), a cone part (34) connected with the main body part (33), and a flat edge (35) connected with the cone part (34) is arranged at the bottom of the cone part. The special-shaped thin-wall box-shaped part is of a non-axisymmetric structure and has the characteristics of thin wall, complex deep cavity, high requirement on the inner surface roughness, small radius of a transition fillet, angle clearing requirement on an inner conical opening part and high dimensional precision. At the same time, the geometric shape and the size of the material are required to have high consistency, and the process molding difficulty is quite large. Because of the requirements of surface roughness, dimensional accuracy, consistency and the like of the special-shaped thin-wall box-shaped part, similar forming schemes or technologies of the part are not available on the market. At present, the traditional box-shaped structural member is generally molded by multiple stretching or die casting.
However, the defect of multiple extension is that the round angles of four corners in the part after molding are too large, the inner conical opening part cannot meet the requirement of clear angles, namely, the inner circular arc (36) is arranged after extension, and the surface is provided with multiple extension marks, so that the roughness, the dimensional accuracy and the consistency cannot meet the requirements. By adopting the die-casting molding scheme, the angle can be cleared, the dimensional accuracy can meet the requirements, but the surface roughness of the die casting cannot meet the requirements, the structure is not compact enough, and the electrical property test cannot be passed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the extension and extrusion forming die and the forming method for the special-shaped thin-wall box-shaped part, which are convenient to take blanks, high in forming efficiency, clear in angle for forming a conical opening, high in dimensional accuracy and high in product consistency.
The aim of the invention is achieved by the following technical scheme: the drawing and extrusion forming die comprises a drawing die A, a drawing die B and an extrusion die, wherein the drawing die A comprises a base A, a pressing ring A, a male die A, a female die A and an upper support A, the female die A is arranged at the top of the base A, a push rod A penetrating through a groove of the female die A is arranged in the base A, the top of the push rod A is connected with a top plate A positioned in the groove of the female die A, the bottom of the upper support A is connected with the pressing ring A, and the male die A is arranged in the pressing ring A;
the extension die B comprises a base B, a pressing ring B, a male die B, a female die B and an upper support B, wherein the female die B is arranged at the top of the base B, a push rod B penetrating through a groove of the female die B is arranged in the base B, the top of the push rod B is connected with a top plate B positioned in the groove of the female die B, the bottom of the upper support B is connected with the pressing ring B, the male die B is arranged in the pressing ring B, the pressing ring B consists of a flat plate and a guide sleeve connected with the flat plate into a whole, and the guide sleeve is positioned below the flat plate;
the extrusion die comprises a base C and an upper support C, a guide assembly is connected between the base C and the upper support C, a male die C is arranged at the top of the base C and comprises a large column and a small column, the small column and the large column are connected into a whole and are located above the large column, an annular inclined plane A and a shoulder are formed between the small column and the large column, a female die jacket is fixedly arranged at the bottom of the upper support C, a female die C is fixedly arranged in the female die jacket, an annular inclined plane B with the same inclination angle as the annular inclined plane A is arranged at the lower end of a female die C groove, a rod extending into the female die C is connected to the top of the upper support C, and an upper push plate located in the female die C groove is connected to the bottom of the rod.
An upper backing plate is fixedly connected between the upper support C and the die jacket.
A lower backing plate is fixedly connected between the base C and the male die C.
The guide assembly comprises a guide sleeve fixedly arranged on the upper support C and a guide column fixedly arranged on the base C, and the guide sleeve is sleeved on the guide column.
The method for extending and extruding the special-shaped thin-wall box-shaped part by the die comprises the following steps:
s1, first extension of a blank: firstly, placing a blank on the top of a groove of a female die A in an extension die A, then enabling a pressing ring A and an upper support A to descend, enabling the pressing ring A to press the blank on the top surface of the female die A, adjusting the pressing force of the pressing ring A to ensure that the blank between the pressing ring A and the female die A can slide, then descending a male die A, clamping the blank by the male die A and a top plate A, continuing descending to a preset height, and then completing first forming of the blank, thereby realizing first extension of the blank; when the blank is taken out, resetting the upper support A, then jacking the ejector rod A, and ejecting the blank from the groove of the female die A by the ejector rod A;
s2, stretching the blank for the first time: placing the blank formed in the step S1 into a groove of a female die B in a stretching die B with an opening facing upwards, descending an upper support B and a pressing ring B, ensuring that a guide sleeve of the pressing ring B is propped against an arc part of the blank, then descending a male die B, clamping the blank by the male die B and a top plate B, and continuing to descend to a preset height, thereby completing the second forming of the blank; gradually and synchronously decreasing the groove size of the female die B, the outer contour size of the male die B and the outer contour size of the pressing ring B, repeating the step S2 to realize the repeated extension of the blank, finally processing the blank with the horn mouth opening, and realizing the repeated extension of the blank;
s3, degreasing and annealing the blank in the step 2;
s4, extrusion molding of a blank: firstly, sleeving a blank with a bell mouth on a small column platform of a male die C of an extrusion die in the step S3 in a downward manner, then descending an upper support C, gradually extruding a straight wall part material of the blank onto an annular inclined plane A by a straight wall of a groove of a female die C downwards, gradually thinning the wall thickness of the blank, and upsetting a cone part between an annular inclined plane B and the annular inclined plane A of the female die C along with the continuing descending of the upper support C, so that the extrusion molding of the blank is realized;
s5, cutting off redundant flat edges on the blank after extrusion molding in the step S4, and finally processing a finished special-shaped thin-wall box-shaped piece; when the product is taken out, the upper support C is slowly moved upwards, and meanwhile, the upper pushing plate below the rod piece is propped against the top of the product, the upper support C is continuously moved upwards, and the finished product is separated from the female die C so as to be left on the male die C, so that the product can be easily taken down.
The invention has the following advantages: the invention has the advantages of convenient blank taking, high molding efficiency, high dimensional accuracy and high product consistency, and achieves the aim of corner cleaning.
Drawings
FIG. 1 is a schematic view of a configuration of a profiled thin-walled box;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a cross-sectional view of K-K of FIG. 1;
fig. 4 is a schematic structural view of the extension die a;
fig. 5 is a schematic structural view of a female die a in the extension die a;
fig. 6 is a schematic structural view of a blank after being stretched by the stretching die a;
fig. 7 is a schematic structural view of the extension die B;
fig. 8 is a schematic structural view of the female die B in the extension die B;
fig. 9 is a schematic structural view of a blank after being stretched by the stretching die B;
FIG. 10 is a schematic view of the structure of an extrusion die;
fig. 11 is a schematic structural view of the male die C;
FIG. 12 is an enlarged partial view of the portion I of FIG. 10;
in the figure, 1-base A, 2-pressing ring A, 3-male die A, 4-female die A, 5-upper support A, 6-push rod A, 7-top plate A, 8-base B, 9-pressing ring B, 10-male die B, 11-female die B, 12-upper support B, 13-push rod B, 14-top plate B, 15-guide sleeve, 16-base C, 17-upper support C, 18-male die C, 19-large column, 20-small column, 21-annular inclined plane A, 22-shoulder, 23-female die outer sleeve, 24-female die C, 25-annular inclined plane B, 26-rod, 27-push plate, 28-upper backing plate, 29-lower backing plate, 30-guide sleeve, 31-guide column, 32-blank, 33-main body part, 34-cone part, 35-flat side, 36-inner circular arc.
Detailed Description
The invention is further described below with reference to the accompanying drawings, the scope of the invention not being limited to the following:
as shown in fig. 1 to 12, an extension and extrusion molding die with a box-shaped member with a special-shaped structure comprises an extension die A, an extension die B and an extrusion die, wherein the extension die A comprises a base A1, a material pressing ring A2, a male die A3, a female die A4 and an upper support A5, the female die A4 is arranged at the top of the base A1, a push rod A6 penetrating through a groove of the female die A4 is arranged in the base A1, the top of the push rod A6 is connected with a top plate A7 positioned in the groove of the female die A4, the bottom of the upper support A5 is connected with the material pressing ring A2, and the male die A3 is arranged in the material pressing ring A2;
the extension die B comprises a base B8, a pressing ring B9, a male die B10, a female die B11 and an upper support B12, wherein the female die B11 is arranged at the top of the base B8, a push rod B13 penetrating through a groove of the female die B11 is arranged in the base B8, the top of the push rod B13 is connected with a top plate B14 positioned in the groove of the female die B11, the bottom of the upper support B12 is connected with the pressing ring B9, the male die B10 is arranged in the pressing ring B9, the pressing ring B9 consists of a flat plate and a guide sleeve 15 connected with the flat plate into a whole, and the guide sleeve 15 is positioned below the flat plate; the extrusion die comprises a base C16 and an upper support C17, a guide assembly is connected between the base C16 and the upper support C17, a male die C18 is arranged at the top of the base C16, the male die C18 comprises a large column platform 19 and a small column platform 20, the small column platform 20 and the large column platform 19 are connected into a whole and are located above the large column platform 19, an annular inclined surface A21 and a table shoulder 22 are formed between the small column platform 20 and the large column platform 19, a female die outer sleeve 23 is fixedly arranged at the bottom of the upper support C17, a female die C24 is fixedly arranged in the female die outer sleeve 23, an annular inclined surface B25 with the same inclination angle as the annular inclined surface A21 is arranged at the lower end of a groove of the female die C24, a rod member 26 extending into the female die C24 is connected at the top of the upper support C17, and an upper push plate 27 located in the groove of the female die C24 is connected at the bottom of the rod member 26.
An upper backing plate 28 is fixedly connected between the upper support C17 and the die jacket 23, and a lower backing plate 29 is fixedly connected between the base C16 and the male die C18. The guide assembly comprises a guide sleeve 30 fixedly arranged on the upper support C17 and a guide column 31 fixedly arranged on the base C16, the guide sleeve 30 is sleeved on the guide column 31, and the guide sleeve 30 can move up and down along the guide column 31.
The method for extending and extruding the special-shaped thin-wall box-shaped part by the die comprises the following steps:
s1, first extension of a blank: firstly, placing a blank 32 on the top of a groove of a female die A4 in an extension die A, then enabling a pressing ring A2 and an upper support A5 to descend, enabling the pressing ring A2 to press the blank on the top surface of the female die A4, adjusting the pressing force of the pressing ring A2 to ensure that the blank 32 between the pressing ring A2 and the female die A4 can slide, then descending a male die A3, and after the male die A3 and a top plate A7 clamp the blank 32 and continue descending to a preset height, completing the first forming of the blank, thereby realizing the first extension of the blank, and after forming, being shown in figure 6; when the blank is taken out, resetting the upper support A5, then jacking the ejector rod A6, and ejecting the blank from the groove of the female die A4 by the ejector rod A6;
s2, stretching the blank for the first time: placing the blank 32 formed in the step S1 into a groove of a concave die B11 in a stretching die B with an opening facing upwards, descending an upper support B12 and a pressing ring B9, ensuring that a guide sleeve 15 of the pressing ring B9 is propped against the arc part of the blank, then descending a male die B10, clamping the blank by the male die B10 and a top plate B14, and continuing descending to a preset height, thereby completing the second forming of the blank; gradually and synchronously decreasing the groove size of the female die B11, the outer contour size of the male die B10 and the outer contour size of the pressing ring B9, repeating the step S2 to realize the repeated extension of the blank, finally processing the blank with the horn mouth opening, realizing the repeated extension of the blank, and forming the blank as shown in figure 9;
s3, degreasing and annealing the blank 32 in the step 2;
s4, extrusion molding of a blank: firstly, sleeving a blank with a bell mouth on a small column 20 of a male die C18 of an extrusion die in the step S3 in a downward manner, then descending an upper bracket C17, gradually extruding a straight wall part material of the blank 32 onto an annular inclined plane A21 by a straight wall of a concave die C24 groove downwards, gradually thinning the wall thickness of the blank, upsetting a cone part 34 between an annular inclined plane B25 and the annular inclined plane A21 of the concave die C24 along with the continuing descending of the upper bracket C17, extruding an inner circular arc 36 into an inclined plane, and achieving the aim of cleaning angles, thereby realizing the extrusion molding of the blank, and being shown in figure 1 after molding;
s5, cutting off the redundant flat edges 35 on the blank 32 after extrusion molding in the step S4, and finally processing a finished special-shaped thin-wall box-shaped piece; when the product is taken out, the upper support C17 is slowly moved upwards, and meanwhile, the upper pushing plate 27 below the rod piece 26 is propped against the top of the product, the upper support C17 is continuously moved upwards, and the finished product is separated from the female die C24 and is left on the male die C18, so that the product can be easily taken down, and the product unloading device has the characteristic of convenience in unloading.
Therefore, the blank is extruded and molded after being stretched, so that the trace generated after the extension is effectively eliminated, the dimensional accuracy is ensured, and meanwhile, the processed product has high consistency and meets the designed electrical performance index. In addition, the forming cavity is formed among the shoulder 22, the bottom surface of the female die C24, the annular inclined surface A21, the annular inclined surface B25, the small column platform 20 and the inner wall of the groove of the female die C24, so that the wall thickness of a product formed after blank extrusion forming is always consistent, the clear angle of a conical opening is formed, and the dimensional accuracy is high.
Claims (3)
1. An extension and extrusion die for box-shaped parts with special-shaped structures, which is characterized in that: the die comprises an extension die A, an extension die B and an extrusion die, wherein the extension die A comprises a base A (1), a pressing ring A (2), a male die A (3), a female die A (4) and an upper support A (5), the female die A (4) is arranged at the top of the base A (1), a push rod A (6) penetrating through a groove of the female die A (4) is arranged in the base A (1), the top of the push rod A (6) is connected with a top plate A (7) positioned in the groove of the female die A (4), the bottom of the upper support A (5) is connected with the pressing ring A (2), and the male die A (3) is arranged in the pressing ring A (2);
the extension die B comprises a base B (8), a pressing ring B (9), a male die B (10), a female die B (11) and an upper support B (12), wherein the female die B (11) is arranged at the top of the base B (8), a push rod B (13) penetrating through a groove of the female die B (11) is arranged in the base B (8), the top of the push rod B (13) is connected with a top plate B (14) positioned in the groove of the female die B (11), the bottom of the upper support B (12) is connected with the pressing ring B (9), the male die B (10) is arranged in the pressing ring B (9), the pressing ring B (9) consists of a flat plate and a guide sleeve (15) connected with the flat plate into a whole, and the guide sleeve (15) is positioned below the flat plate;
the extrusion die comprises a base C (16) and an upper support C (17), a guide assembly is connected between the base C (16) and the upper support C (17), a male die C (18) is arranged at the top of the base C (16), the male die C (18) comprises a large column base (19) and a small column base (20), the small column base (20) and the large column base (19) are connected into a whole and are positioned above the large column base (19), an annular inclined plane A (21) and a shoulder (22) are formed between the small column base (20) and the large column base (19), a female die jacket (23) is fixedly arranged at the bottom of the upper support C (17), a female die C (24) is fixedly arranged in the female die jacket (23), an annular inclined plane B (25) with the same inclination angle as the annular inclined plane A (21) is arranged at the lower end part of a groove of the female die C (24), a rod (26) extending into the female die C (24) is connected to the top of the upper support C (17), and a push plate (27) positioned in the groove of the female die C (24) is connected to the bottom of the rod (26);
an upper backing plate (28) is fixedly connected between the upper support C (17) and the female die outer sleeve (23);
the guide assembly comprises a guide sleeve (30) fixedly arranged on the upper support C (17) and a guide column (31) fixedly arranged on the base C (16), and the guide sleeve (30) is sleeved on the guide column (31).
2. An extension and extrusion die for boxes with profiled structures according to claim 1, characterized in that: a lower base plate (29) is fixedly connected between the base C (16) and the male die C (18).
3. A method of die extension and extrusion of profiled box-like parts according to any one of claims 1-2, characterized in that: it comprises the following steps:
s1, first extension of a blank: firstly, placing a blank (32) on the top of a groove of a female die A (4) in an extension die A, then enabling a pressing ring A (2) and an upper support A (5) to descend, pressing the blank on the top surface of the female die A (4) by the pressing ring A (2), adjusting the pressing force of the pressing ring A (2) to ensure that the blank (32) between the pressing ring A (2) and the female die A (4) can slide, then descending a male die A (3), and after the blank (32) is clamped by the male die A (3) and a top plate A (7) and continuously descends to a preset height, finishing the first forming of the blank, thereby realizing the first extension of the blank; when the blank is taken out, resetting the upper support A (5), then jacking the ejector rod A (6), and ejecting the blank from the groove of the female die A (4) by the ejector rod A (6);
s2, stretching the blank for the first time: placing the blank (32) formed in the step S1 into a groove of a concave die B (11) in an extension die B with an opening upwards, descending an upper support B (12) and a pressing ring B (9), ensuring that a guide sleeve (15) of the pressing ring B (9) is propped against the arc part of the blank, and then descending a convex die B (10), wherein the convex die B (10) and a top plate B (14) clamp the blank and continuously descend to a preset height, so that the second forming of the blank can be completed; gradually and synchronously decreasing the groove size of the female die B (11), the outer contour size of the male die B (10) and the outer contour size of the pressing ring B (9), repeating the step S2 to realize the repeated extension of the blank, and finally processing the blank with a horn mouth opening to realize the repeated extension of the blank;
s3, deoiling and annealing the blank (32) stretched for multiple times;
s4, extrusion molding of a blank: firstly, sleeving a blank with a bell mouth on a small column (20) of a male die C (18) of an extrusion die in the step S3 downwards, then descending an upper support C (17), gradually extruding a straight wall part material of a blank (32) onto an annular inclined plane A (21) downwards by the straight wall of a groove of a female die C (24), gradually thinning the wall thickness of the blank, and upsetting a cone part (34) between an annular inclined plane B (25) of the female die C (24) and the annular inclined plane A (21) along with the continuous descending of the upper support C (17), so that the extrusion molding of the blank is realized;
s5, cutting off redundant flat edges (35) on the blank (32) after extrusion molding in the step S4, and finally processing a finished special-shaped thin-wall box-shaped part; when the product is taken out, the upper support C (17) is slowly moved upwards, meanwhile, the upper pushing plate (27) below the rod piece (26) is propped against the top of the product, the upper support C (17) is continuously moved upwards, and the finished product is separated from the female die C (24) so as to be left on the male die C (18), so that the product can be easily taken down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710977685.9A CN107755445B (en) | 2017-10-19 | 2017-10-19 | Extension and extrusion forming die and method for box-shaped piece with special-shaped structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710977685.9A CN107755445B (en) | 2017-10-19 | 2017-10-19 | Extension and extrusion forming die and method for box-shaped piece with special-shaped structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107755445A CN107755445A (en) | 2018-03-06 |
| CN107755445B true CN107755445B (en) | 2023-12-05 |
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| CN201710977685.9A Active CN107755445B (en) | 2017-10-19 | 2017-10-19 | Extension and extrusion forming die and method for box-shaped piece with special-shaped structure |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110345172B (en) * | 2018-04-02 | 2021-01-19 | 法法汽车(中国)有限公司 | Clutch locking mechanism, locking clutch, two-gear transmission and pure electric vehicle |
| CN110743955A (en) * | 2019-10-31 | 2020-02-04 | 马鞍山钢铁股份有限公司 | Deep-tube-shaped metal shell drawing forming method and multi-channel one-step forming die |
| CN113059012B (en) * | 2021-03-17 | 2022-05-31 | 中北大学 | Extrusion-stretching composite forming method for large-height-diameter-ratio conical cylinder |
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| CN103658382A (en) * | 2012-09-18 | 2014-03-26 | 上海强精金属制品有限公司 | Stretching-extruding-trimming composite die for shell |
| CN105921639A (en) * | 2016-04-26 | 2016-09-07 | 浙江爱仕达电器股份有限公司 | Manufacturing method for IH (Induction Heating) rice cooker liner and liner manufactured by method |
| CN106881405A (en) * | 2017-03-21 | 2017-06-23 | 义乌市易开盖实业公司 | Tapered shaped can drawing die and stretch forming method |
| CN207386200U (en) * | 2017-10-19 | 2018-05-22 | 成都锦江电子系统工程有限公司 | A kind of extending with polymorphic structure box part and extrusion molding dies |
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