CN116603912B - Forming method of small-curvature fillet radius cylindrical part - Google Patents
Forming method of small-curvature fillet radius cylindrical partInfo
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- CN116603912B CN116603912B CN202310557292.8A CN202310557292A CN116603912B CN 116603912 B CN116603912 B CN 116603912B CN 202310557292 A CN202310557292 A CN 202310557292A CN 116603912 B CN116603912 B CN 116603912B
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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
- B21D22/10—Stamping using yieldable or resilient pads
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a method and a system for forming a small-curvature fillet radius cylindrical part, and belongs to the technical field of plate forming. And determining the shape and the size of the preformed female die according to the shape and the size of the cylindrical part, and applying pressure to the preformed plate in stages or simultaneously by combining the formed rubber bodies to promote the plate to flow to the round corners in the forming process so as to realize the forming of the small-curvature round corner radius. The invention has simple operation, can effectively improve the forming quality of the small curvature fillet, has low wall thickness reduction rate of the workpiece and even stress distribution, can inhibit the rebound deformation of the part in the forming process, has small rebound and more accurate configuration.
Description
Technical Field
The invention belongs to the technical field of sheet forming, and particularly relates to a forming method of a small-curvature fillet radius cylindrical part.
Background
Along with the gradual improvement of the requirements of the manufacturing field on light weight, high strength and precise forming, a great number of light alloy shell components are designed to have the geometric characteristics of thin wall, heterostructure, small angle area and the like so as to meet the performance requirements of equipment in the fields of aerospace, automobile industry and the like. During the forming process of the thin-wall shell component, the plasticity of the material is low, and the part can generate obvious local stress concentration phenomenon, especially at the small curvature fillet, and further generate excessive thinning and cracking phenomena in the local area, so that the part fails during the forming process.
In the traditional steel die drawing and forming process, a suspension space area exists, serious wall thickness thinning phenomenon is locally easy to generate, stress concentration is generated when the corner of a part is formed, so that the part is broken, and larger residual stress and deformation are generated in the steel die drawing and forming process, and subsequent processes such as annealing, heat treatment and the like are required, so that the production cost and the process difficulty are increased.
Compared with the traditional steel die deep drawing forming, the soft die forming has no suspended empty area, good filling performance, good surface quality of processed parts, low wall thickness reduction rate of the parts and uniform local stress distribution. However, in conventional hydraulic drawing or soft die drawing of urethane rubber, a small-curvature fillet portion is broken due to insufficient inflow of material, and thus a new small-curvature fillet drawing forming method is demanded.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide the forming method of the cylindrical part with the small-curvature fillet radius, which effectively improves the forming quality of the small-curvature fillet, has low wall thickness reduction rate of a workpiece and uniform stress distribution, can inhibit rebound deformation of parts in the forming process, has small rebound and more accurate configuration.
The invention is realized by the following technical scheme:
A method of forming a small-curvature fillet radius cylinder comprising:
the method comprises the steps of S1, installing a blank on a preformed female die, installing a medium bin above the blank, filling forming medium in a forming chamber formed between the medium bin and the blank, installing a preformed male die on the upper part of the medium bin, wherein shoulder angles and bottom angles of a cavity of the preformed female die are fillets, the side wall of the cavity is a first cambered surface arched towards the cavity, and the bottom of the cavity is a second cambered surface arched towards the cavity;
s2, applying downward force to the medium bin to clamp the blank, enabling the pre-forming male die to descend and simultaneously extruding forming medium, forming pressure in the forming chamber, and applying pressure to the blank by the forming medium to enable the blank to deform and be attached to the pre-forming female die cavity;
S3, stopping descending of the preformed male die, removing the medium bin, taking down the preformed male die, and taking out the preformed workpiece;
s4, mounting the preformed workpiece on a forming female die, and mounting a medium bin above the preformed workpiece, wherein annular first forming rubber is sleeved outside cylindrical second forming rubber to form a combined forming rubber body, the bottom of the second forming rubber is a cambered surface bulge, and the second forming rubber is filled into a forming chamber formed by the medium bin and the preformed workpiece;
S5, applying downward force to the medium bin to clamp the preformed workpiece, and enabling the forming male die to move downwards to be attached to the combined forming rubber body;
s6, continuously moving a forming male die downwards, enabling the first forming rubber to generate pressure on the side wall of the preformed workpiece, enabling the side wall of the preformed workpiece to be attached to the side wall of a forming female die cavity, continuously moving the forming male die downwards, enabling the second forming rubber to contact the bottom of the preformed workpiece, enabling the second forming rubber to generate pressure on the bottom of the preformed workpiece, enabling the bottom of the preformed workpiece to be attached to the bottom of the forming female die cavity, continuously moving the forming male die downwards, enabling the second forming rubber to be extruded, enabling the bottom of the preformed workpiece to be attached to the bottom of the forming female die cavity, enabling the second forming rubber to be extruded to the first forming rubber in a radial expansion part, enabling the first forming rubber to be extruded downwards, and enabling the preformed workpiece to be attached to a round corner of the bottom of the forming female die cavity;
and S7, removing the medium bin, taking down the forming male die, taking down the combined forming rubber body, and taking out the forming workpiece.
Preferably, the radius of the forming die cavity is R, the depth is H, the bottom angle radius of the cavity is R 1, the shoulder angle radius of the cavity is R 2, the radius of the preformed die cavity is R, the depth is H, The radius of the bottom angle of the preformed concave die cavity is r 1 ′, the radius of the shoulder angle is r 2 ′, The first cambered surface radius of the preformed female die is r 3, the second cambered surface radius is r 4,
Preferably, the internal surface area of the preformed cavity is equal to the forming cavity.
Preferably, the forming medium is water, oil or viscous medium.
Preferably, in S2, the descending speed of the pre-forming male die is 0.1-0.5 mm/S, and in S5, the descending speed of the forming male die is 0.1-0.5 mm/S.
Preferably, the outer diameter of the first shaped rubber is equal to the inner diameter of the media bin and the outer diameter d of the second shaped rubber is equal to the inner diameter of the first shaped rubber.
Further preferably, the radius of the preformed female die cavity is r, the second formed rubber outer diameter is d,
Preferably, the second formed rubber has a hardness greater than that of the first formed rubber.
Further preferably, the shore hardness of the first molding rubber ranges from 20 to 25A, and the shore hardness of the second molding rubber ranges from 45 to 50A.
Preferably, the first forming rubber and the second forming rubber have the same height, and the bottom of the second forming rubber has the cambered surface protruding heightH is the depth of the cavity of the preformed female die, the diameter of a boss at the lower end of the forming male die is equal to the inner diameter of the second forming rubber, and the height of the boss is equal to the height of the cambered surface bulge of the second forming rubber.
Compared with the prior art, the invention has the following beneficial technical effects:
The forming method of the small-curvature fillet radius cylindrical part disclosed by the invention utilizes the reasonable forms of preforming and combined forming rubber bodies, and effectively improves the quality of small-fillet forming. Compared with the traditional steel die drawing forming method, the drawing forming method of the small-curvature fillet radius cylindrical part disclosed by the invention has the advantages that the blank is preformed through soft die drawing, the blank is longitudinally and transversely accumulated in advance, a larger fillet is formed at the corner position, the wall thickness reduction rate of a workpiece is low, and the stress distribution is uniform. The deformation sequence of the plate is regulated and controlled by adopting the combined formed rubber body, so that the material flow can be effectively promoted, the combined formed rubber body is adopted as a pressure medium in the forming process, the soft rubber at the edge part is firstly contacted with the side wall of the workpiece, the accumulated material longitudinally flows, the hard rubber at the central part is contacted with the bottom of the workpiece, the material at the bottom of the workpiece flows from the center to the edge, the rubber at the edge part is deformed by the rubber transverse expansion part at the central part, the material of the workpiece is promoted to be attached to the round corners, and the formed part is fully formed at the round corners. The rebound of the workpiece is small in the machining process, the configuration is accurate, the workpiece can flow well in the axial direction and the radial direction by contacting the combined rubber with the preformed workpiece successively or simultaneously, the problem of insufficient forming of the deep drawing forming fillet is solved, and meanwhile, the rebound deformation of the part can be restrained due to the elasticity of the rubber soft die after forming, the rebound is small, and the configuration is more accurate.
Further, the size of the preformed female die is within the range of value, so that preformed workpieces can be accumulated transversely and longitudinally, materials can flow to round corners more easily during final forming, and the blanks can be fully unfolded during final forming without generating wrinkles.
Further, the inner surface area of the cavity of the preformed female die is equal to that of the forming female die, so that the material accumulation part of the preformed workpiece can be attached to the female die in the final forming process, no wrinkles or cracks are generated, and the wall thickness distribution is more uniform.
Further, the forming medium adopts water, oil or viscous medium, so that the fluidity is better, and the forming medium is more suitable for forming a complex preformed structure.
Furthermore, the moving speed of the male die in the pre-forming and final forming is 0.1-0.5 mm/s, so that a proper forming speed range is provided for blank pre-forming and final forming, and surface defects of formed parts are avoided.
Further, the outer diameter of the first formed rubber is equal to the inner diameter of the medium bin, the outer diameter d of the second formed rubber is equal to the inner diameter of the first formed rubber, and meanwhile, the value range of the outer diameter of the second formed rubber can enable the edge part rubber to contact the side wall of the preformed workpiece at first, so that the flow of accumulated materials on the side wall is promoted.
Further, the hardness of the second formed rubber is greater than that of the first formed rubber, and the hardness ranges of the second formed rubber and the first formed rubber are selected, so that the center part rubber assists the edge part rubber to deform, and the material is promoted to flow to the fillets.
Further, the height of the boss of the forming male die is equal to that of the cambered surface bulge of the second forming rubber, and the height of the cambered surface bulge of the bottom of the second forming rubber is in a range of values, so that the top of the second forming rubber contacts with the center position of the preformed workpiece, the rubber is continuously pressed along with the center part, and the material at the bottom of the preformed workpiece gradually flows from the center to the edge.
Drawings
FIG. 1 is a front cross-sectional view of the pre-form pre-mold mounting monolith of the present invention;
FIG. 2 is a front cross-sectional view of the overall structure of the present invention when the preforming is completed;
FIG. 3 is a front cross-sectional view of the final pre-form die-set monolith of the present invention;
FIG. 4 is a cross-sectional view of the overall structure of the present invention with the male mold engaging the composite rubber during final forming;
FIG. 5 is a cross-sectional view of the overall structure of the invention during final forming with the edge portion rubber forming the side wall of the workpiece;
FIG. 6 is a cross-sectional view of the overall structure of the composite rubber molded workpiece during final molding in accordance with the present invention;
FIG. 7 is a schematic view of the overall structure of the present invention when the final forming is completed;
fig. 8 is a diagram of the dimensions of the preformed and final shaped dies of the present invention.
In the figure, 1 is a preformed male die, 2 is a medium bin, 3 is a forming medium, 4 is a preformed female die, 5 is a forming male die, 6 is first forming rubber, 7 is second forming rubber, and 8 is a forming female die.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples, which are given by way of illustration and not limitation.
The invention discloses a forming method of a small-curvature fillet radius cylindrical part, which comprises the following steps of:
s1, installing a blank on a preformed female die 4, installing a medium bin 2 above the blank, filling a forming medium 3 in a forming chamber formed between the medium bin 2 and the blank, installing a preformed male die 1 on the upper part of the medium bin, wherein shoulder angles and bottom angles of a cavity of the preformed female die 4 are rounded angles, the side wall of the cavity is a first cambered surface arched towards the cavity, and the bottom of the cavity is a second cambered surface arched towards the cavity;
S2, applying downward force to the medium bin 2 to clamp the blank, enabling the pre-forming male die 1 to descend and simultaneously extruding the forming medium 3, forming pressure in a forming chamber, and applying pressure to the blank by the forming medium 3 to enable the blank to deform and be attached to the cavity of the pre-forming female die 4;
S3, stopping descending of the preformed male die 1, removing the medium bin 2, taking down the preformed male die 1, and taking out a preformed workpiece;
S4, mounting a preformed workpiece on a forming female die 8, and mounting a medium bin 2 above the preformed workpiece, sleeving an annular first forming rubber 6 outside a cylindrical second forming rubber 7 to form a combined forming rubber body, wherein the bottom of the second forming rubber 7 is a cambered surface bulge and is filled into a forming chamber formed by the medium bin 2 and the preformed workpiece;
S5, applying downward force to the medium bin 2 to clamp the preformed workpiece, and enabling the forming male die 5 to move downwards to be attached to the combined forming rubber body, wherein the lower end of the forming male die 5 is of a boss structure;
S6, continuously moving the forming male die 5 downwards, enabling the first forming rubber 6 to generate pressure on the side wall of the preformed workpiece, enabling the side wall of the preformed workpiece to be attached to the side wall of the cavity of the forming female die 8, continuously moving the forming male die 5 downwards, enabling the second forming rubber 7 to contact the bottom of the preformed workpiece, enabling the second forming rubber 7 to generate pressure on the bottom of the preformed workpiece, enabling the bottom of the preformed workpiece to be attached to the bottom of the cavity of the forming female die 8, continuously moving the forming male die 5 downwards, enabling the second forming rubber 7 to be extruded, enabling the radially expanded part of the second forming rubber 7 to extrude the first forming rubber 6, enabling the first forming rubber 6 to be extruded downwards through the forming male die 5, and enabling the preformed workpiece to be attached to the bottom of the cavity of the forming female die 8 in a round angle mode;
and S7, removing the medium bin 2, removing the forming male die 5, removing the combined forming rubber body, and taking out the formed workpiece.
In a preferred embodiment of the invention, the radius of the cavity of the forming die 8 is R, the depth is H, the radius of the base angle of the cavity is R 1, the radius of the shoulder angle of the cavity is R 2, the radius of the cavity of the pre-forming die 4 is R, the depth is H,The radius of the bottom angle of the cavity of the preformed female die 4 is r 1 ′, the radius of the shoulder angle is r 2 ′,The first cambered surface radius of the preformed female die 4 is r 3, the second cambered surface radius is r 4,
In a preferred embodiment of the invention, the internal surface area of the cavity of the preform die 4 is equal to the forming die 8.
In a preferred embodiment of the invention, the forming medium 3 is water, oil or viscous medium.
In a preferred embodiment of the invention, in S2, the descending speed of the pre-forming male die 1 is 0.1-0.5 mm/S, and in S5, the descending speed of the forming male die 8 is 0.1-0.5 mm/S.
In a preferred embodiment of the invention, the outer diameter of the first shaped rubber 6 is equal to the inner diameter of the media silo 2 and the outer diameter d of the second shaped rubber 7 is equal to the inner diameter of the first shaped rubber 6. Preferably, the radius of the cavity of the preformed female die 4 is r, the outer diameter of the second formed rubber 7 is d,
In a preferred embodiment of the invention, the second shaped rubber 7 has a hardness greater than that of the first shaped rubber 6.
In a preferred embodiment of the present invention, the shore hardness of the first molding rubber 6 ranges from 20 to 25a, and the shore hardness of the second molding rubber 7 ranges from 45 to 50a.
In a preferred embodiment of the present invention, the first molding rubber 6 and the second molding rubber 7 have the same height, and the bottom of the second molding rubber 7 has a convex curved surfaceH is the depth of the cavity of the preformed female die 4, the diameter of a boss at the lower end of the forming male die 5 is equal to the inner diameter of the second forming rubber 7, and the height of the boss is equal to the height of the cambered surface bulge of the second forming rubber 7.
The invention is further illustrated by the following specific examples:
As shown in fig. 8, the shape and size of the forming die 8 are determined according to the size of the cylindrical part, the cavity radius of the forming die 8 is R, the depth is H, the bottom fillet radius is R 1, the shoulder fillet radius is R 2, wherein r=10mm, h=4mm, and R 1＝0.2mm,r2 =0.4 mm;
The shape size of the pre-forming die 4 is determined according to the shape size of the forming die 8, the cavity radius of the pre-forming die 4 is r, the depth is h, the bottom fillet radius is r 1 ′, the shoulder fillet radius is r 2 ′, the bottom second cambered surface radius is r 3, and the side wall first cambered surface radius is r 4.
Preferably, the method comprises the steps of, r＝7mm,h＝2.8mm,r1 ′＝0.45mm,r2 ′＝0.9mm,r3＝11.2mm,r4＝4.5mm, Is taken to ensure that the blank transversely and longitudinally accumulate in a proper range.
As shown in fig. 1, a blank is mounted on a pre-forming die 4, a media bin 2 is mounted on the blank, the blank is clamped by applying downward force to the media bin 2, hydraulic oil is filled in the media bin, a pre-forming punch 1 is mounted on the upper part of the media bin 2, and the pre-forming punch 1 descends at a certain speed.
As shown in fig. 2, when the blank is completely attached to the preformed female die 4, the preformed male die 1 stops descending, the preformed male die 1 is taken down, the medium bin 2 is taken down, and the preformed workpiece is taken out.
As shown in fig. 3, a preformed workpiece is mounted on a forming die 8, a dielectric bin 2 is mounted on the preformed workpiece, a first forming rubber 6 and a second forming rubber 7 are combined and filled in the dielectric bin 2, a forming male die 5 is mounted on the upper part of the dielectric bin 2, the dielectric bin 2 applies downward force to clamp a blank, and the forming male die 5 descends at a speed of 0.5 mm/s.
Wherein the outer diameter of the first forming rubber 6 is the inner diameter of the medium bin 2, the outer diameter of the second forming rubber 7 is the inner diameter of the first forming rubber 6, the forming male die 5 is provided with a boss, the height of the boss is the cambered surface boss height h 1 of the second forming rubber,Let h 1 = 0.85mm, boss diameter is the second formed rubber 7 diameter d.
As shown in fig. 4, the forming punch 5 descends to be attached to the combined rubber.
Preferably, the method comprises the steps of,D=9.8mm, the first formed rubber 6 is contacted with the preformed workpiece first, and the lamination of the preformed workpiece to the cavity in the longitudinal direction is promoted.
As shown in fig. 5, the first molding rubber 6 is first brought into contact with the preformed workpiece, and the longitudinal accumulation of the preformed workpiece is fitted to the cavity.
Preferably, the hardness of the first forming rubber 6 is smaller than that of the second forming rubber 7, the shore hardness of the first forming rubber 6 is 22A, the shore hardness of the second forming rubber 7 is 47A, the second forming rubber 7 is used for promoting radial flow of the bottom material of the preformed workpiece, and when the second forming rubber 7 is compressed, the radial expansion part is used for deforming the first forming rubber 6 and promoting the material of the preformed workpiece to flow to a round angle.
As shown in fig. 6, the second forming rubber 7 presses down the bottom of the preformed workpiece, the material at the bottom of the preformed workpiece flows from the center to the periphery and gradually clings to the bottom of the cavity, and the side wall of the preformed workpiece is just about to cling to the side wall of the cavity under the action of the first forming rubber 6.
As shown in fig. 7, the second forming rubber 7 presses down the bottom of the preformed workpiece, the bottom of the preformed workpiece completely fits the cavity, the second forming rubber 7 presses the radial expansion part to deform the first forming rubber 6, the side wall of the preformed workpiece completely fits the side wall of the cavity, the preformed workpiece material flows to the round corners, and the corners of the preformed workpiece are fit with the round corners.
And (5) taking down the forming male die 5, taking down the medium bin 2, taking down the combined rubber, and taking out the formed cylindrical part.
It is to be understood that the foregoing description is only a part of the embodiments of the present invention, and that the equivalent changes of the system described according to the present invention are included in the protection scope of the present invention. Those skilled in the art can substitute the described specific examples in a similar way without departing from the structure of the invention or exceeding the scope of the invention as defined by the claims, all falling within the scope of protection of the invention.
Claims (10)
1. A method of forming a small-curvature fillet radius cylinder comprising:
The method comprises the steps of S1, installing a blank on a pre-forming female die (4), installing a medium bin (2) above the blank, filling a forming medium (3) in a forming chamber formed between the medium bin (2) and the blank, installing a pre-forming male die (1) on the upper part of the medium bin, wherein shoulder angles and bottom angles of a cavity of the pre-forming female die (4) are rounded angles, the side wall of the cavity is a first cambered surface arched towards the cavity, and the bottom of the cavity is a second cambered surface arched towards the cavity;
S2, applying downward force to the medium bin (2) to clamp the blank, enabling the pre-forming male die (1) to descend and simultaneously extruding the forming medium (3), forming pressure in the forming chamber, and applying pressure to the blank by the forming medium (3) to enable the blank to deform and be attached to the cavity of the pre-forming female die (4);
s3, stopping descending of the preformed male die (1), removing the medium bin (2), taking down the preformed male die (1), and taking out the preformed workpiece;
S4, mounting a preformed workpiece on a forming female die (8), mounting a medium bin (2) above the preformed workpiece, sleeving an annular first forming rubber (6) outside a cylindrical second forming rubber (7) to form a combined forming rubber body, wherein the bottom of the second forming rubber (7) is a cambered surface bulge, and filling the cambered surface bulge into a forming chamber formed by the medium bin (2) and the preformed workpiece;
S5, applying downward force to the medium bin (2) to clamp the preformed workpiece, and enabling the forming male die (5) to move downwards to be attached to the combined forming rubber body, wherein the lower end of the forming male die (5) is of a boss structure;
S6, continuously moving a forming male die (5) downwards, enabling a first forming rubber (6) to generate pressure on the side wall of a preformed workpiece, enabling the side wall of the preformed workpiece to be attached to the side wall of a cavity of a forming female die (8), continuously moving the forming male die (5) downwards, enabling a second forming rubber (7) to contact the bottom of the preformed workpiece, enabling the bottom of the preformed workpiece to be attached to the bottom of the cavity of the forming female die (8), continuously moving the forming male die (5) downwards, enabling the second forming rubber (7) to be extruded, enabling the bottom of the preformed workpiece to be attached to the bottom of the cavity of the forming female die (8), enabling a radial expansion part of the second forming rubber (7) to extrude the first forming rubber (6), enabling the first forming rubber (6) to be extruded downwards, and enabling the preformed workpiece to be attached to the bottom of the cavity of the forming female die (8) in a round angle;
and S7, removing the medium bin (2), removing the forming male die (5), removing the combined forming rubber body, and taking out the formed workpiece.
2. A method for forming a small radius cylindrical part, as claimed in claim 1, characterized in that the radius of the cavity of the forming die (8) is R, the depth is H, the base angle radius of the cavity is R 1, the shoulder radius of the cavity is R 2, the radius of the cavity of the pre-forming die (4) is R, the depth is H,The radius of the bottom angle of the cavity of the preformed female die (4) is r 1 ′, the radius of the shoulder angle is r 2 ′,The first cambered surface radius of the preformed female die (4) is r 3, the second cambered surface radius is r 4,
3. A method of forming a small radius fillet radius cylinder according to claim 1, wherein the internal surface area of the cavity of the preform die (4) is equal to the forming die (8).
4. A method of forming a small radius cylinder as claimed in claim 1, characterized in that the forming medium (3) is water, oil or viscous medium.
5. The method for forming a small-curvature fillet radius cylindrical part according to claim 1, wherein in S2, the downward speed of the preforming punch (1) is 0.1 to 0.5mm/S, and in S5, the downward speed of the forming punch (5) is 0.1 to 0.5mm/S.
6. A method of forming a small radius cylinder of claim 1 wherein the outer diameter of the first forming rubber (6) is equal to the inner diameter of the media bin (2) and the outer diameter d of the second forming rubber (7) is equal to the inner diameter of the first forming rubber (6).
7. A method of forming a small radius cylinder as claimed in claim 6, wherein the radius of the cavity of the preform die (4) is r, the outer diameter of the second forming rubber (7) is d,
8. A method of forming a small radius cylinder as claimed in claim 1, characterized in that the second forming rubber (7) has a hardness greater than the first forming rubber (6).
9. The method for forming a small-curvature rounded radius cylindrical member according to claim 8, wherein the shore hardness of the first forming rubber (6) is in the range of 20 to 25a, and the shore hardness of the second forming rubber (7) is in the range of 45 to 50a.
10. A method for forming a small radius cylinder as claimed in claim 1, wherein the first forming rubber (6) and the second forming rubber (7) have the same height, and the bottom of the second forming rubber (7) has a convex cambered surfaceH is the depth of a cavity of the pre-forming female die (4), the diameter of a boss at the lower end of the forming male die (5) is equal to the inner diameter of the second forming rubber (7), and the height of the boss is equal to the height of an arc-surface boss of the second forming rubber (7).
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| CN202310557292.8A CN116603912B (en) | 2023-05-17 | 2023-05-17 | Forming method of small-curvature fillet radius cylindrical part |
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| CN116603912B true CN116603912B (en) | 2025-08-19 |
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|---|---|---|---|---|
| CN1053762A (en) * | 1989-12-18 | 1991-08-14 | 索莱克公司 | Method and device for forming sheet metal blanks, in particular for producing cathode ray tube panels, and cathode ray tube panels produced by this method |
| CN107695170A (en) * | 2017-10-18 | 2018-02-16 | 陕西科技大学 | The firm mould flexible die compound molding device and method of a kind of reducing cylindrical member |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3928901A (en) * | 1974-10-10 | 1975-12-30 | Gen Electric | Forming a cladding sheet to a convex/concave substrate |
| JP4721423B2 (en) * | 2005-11-04 | 2011-07-13 | 株式会社神戸製鋼所 | Molding method and mold for molding |
| CN104801603B (en) * | 2013-06-28 | 2017-01-18 | 福建省永春佳威塑料包装制品有限公司 | Working method of pressurization mold |
| DE102016005902B3 (en) * | 2016-05-13 | 2017-06-29 | Audi Ag | Method and press tool for producing a complex sheet metal part with high draw depth |
| CN112222273A (en) * | 2020-09-10 | 2021-01-15 | 哈尔滨理工大学 | A method for step-by-step pre-expansion forming of complex special-shaped bottom parts |
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- 2023-05-17 CN CN202310557292.8A patent/CN116603912B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053762A (en) * | 1989-12-18 | 1991-08-14 | 索莱克公司 | Method and device for forming sheet metal blanks, in particular for producing cathode ray tube panels, and cathode ray tube panels produced by this method |
| CN107695170A (en) * | 2017-10-18 | 2018-02-16 | 陕西科技大学 | The firm mould flexible die compound molding device and method of a kind of reducing cylindrical member |
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