CN112275879A - Forming die for reducing lug making height of sheet drawing forming and preparation method thereof - Google Patents
Forming die for reducing lug making height of sheet drawing forming and preparation method thereof Download PDFInfo
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- CN112275879A CN112275879A CN202011061964.9A CN202011061964A CN112275879A CN 112275879 A CN112275879 A CN 112275879A CN 202011061964 A CN202011061964 A CN 202011061964A CN 112275879 A CN112275879 A CN 112275879A
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- die
- forming
- lug
- fillet
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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
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/22—Moulding
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- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
The invention belongs to the technical field of deep drawing and forming, and discloses a preparation method of a forming die for reducing the lug making height of thin plate deep drawing and forming, which comprises the following steps: manufacturing a three-dimensional data model of a forming die according to the product specification of a drawing part; carrying out drawing forming simulation based on the three-dimensional data model by adopting a finite element simulation analysis method to obtain the ear making heights in different directions; gradually enlarging the size of the die fillet in the larger position of the lug making according to the lug making height, promoting more materials to flow into the die until the inflowing materials counteract the lug making, and acquiring the revision value of the die fillet at the moment; and adjusting the three-dimensional data model based on the revision value of the concave die fillet and preparing a forming die. The forming die and the forming method provided by the invention can reliably inhibit the lug making defect.
Description
Technical Field
The invention relates to the technical field of drawing forming, in particular to a forming die for reducing the lug making height of sheet drawing forming and a preparation method thereof.
Background
Due to the anisotropy of the rolled steel plate, the lug making defect is easy to occur in the flange area after the steel plate is drawn and formed, and the lug making material with excessive shearing seriously reduces the material utilization rate. In the prior art, the lug making defect is mainly inhibited by a method of improving material performance and reducing anisotropy or a method of optimizing a deep drawing die and changing local material fluidity. For example, the variable-gap female die achieves the purpose of controlling the lug making rate by changing the gap of the die, and specifically comprises the following steps: smaller die gaps are arranged at the positions with large sheet metal yield stress, large die gaps are arranged at the positions with small yield stress, and different blank pressing forces are matched in the drawing process, so that the local directional flow of the material is changed, and the lug making height is reduced. However, the fit clearance between the drawing cavity and the male die and the fit clearance between the blank holder and the female die are small, particularly for materials such as a tin plate with thin drawing, the clearance is only dozens of micrometers, the thickness of the material per se also has certain fluctuation, the flowing sensitivity of the material is controlled to be large through the clearance, the resistance is easily overlarge, and the drawn part is cracked, and the actual control effect is not ideal.
Disclosure of Invention
The invention provides a forming die for reducing the lug making height of sheet drawing forming and a preparation method thereof, and solves the technical problem that the lug making defect control effect of sheet drawing forming in the prior art is not ideal.
In order to solve the technical problem, the invention provides a preparation method of a forming die for reducing the lug making height of sheet drawing forming, which comprises the following steps:
designing a three-dimensional data model of a fixed concave die fillet forming die according to the product specification of a drawing piece;
carrying out drawing forming simulation based on the three-dimensional data model by adopting a finite element simulation analysis method to obtain the ear making heights in different directions;
gradually enlarging the size of the die fillet in the larger position of the lug making according to the lug making height, promoting more materials to flow into the die until the inflowing materials counteract the lug making, and acquiring the revision value of the die fillet at the moment;
and adjusting the three-dimensional data model based on the revised value of the fillet of the female die to re-simulate the satisfactory stamping lug-making condition, and then processing and designing a forming die according to the revised die.
Further, the preparation method further comprises the following steps:
the die designed can adjust the azimuth angle of the fillet of the female die according to the feeding direction, so that the lug making direction is matched with the fillet of the female die.
The forming die for reducing the lug forming height in sheet drawing forming is prepared by adopting the preparation method of the forming die for reducing the lug forming height in sheet drawing forming.
Further, the forming die for reducing the lug height of the sheet drawing forming comprises: the device comprises an upper die base, a female die base, a rotary female die, a guide sleeve, a guide pillar, a lower die base, a blank holder, an ejector rod and a male die;
the upper die holder and the lower die holder are arranged in parallel, the guide sleeve is fixed on the upper die holder, the guide pillar is fixed on the lower die holder, and the guide pillar is embedded in the guide sleeve;
the female die holder is fixed on the upper die holder, and the rotary female die is fixed in a hole groove formed in the female die holder;
a fastening screw hole is formed in the die holder, a fastening bolt is arranged in the fastening screw hole, a circumferential groove is formed in the side wall of the rotary female die, and the end of the fastening bolt can be embedded in the circumferential groove and tightly press the rotary female die along the radial direction of the rotary female die;
the blank holder is fixed on the lower die holder through the ejector rod, the male die is fixed on the lower die holder and is opposite to the rotary female die, and the male die is arranged in the center of the blank holder.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the forming die for reducing the lug making height in sheet drawing forming and the preparation method thereof, the lug making condition is obtained through three-dimensional modeling of the forming die and simulation of drawing forming; and then, the fillet of the female die is gradually adjusted to promote more materials to flow into the female die until the materials flowing in counteract the lug making, and the revision value of the fillet of the female die is obtained at the moment, so that the three-dimensional data of the forming die for inhibiting the lug making defect is obtained to be used for preparing the solid die, and the lug making defect can be inhibited in the actual production. Meanwhile, the fillet machining size of the concave die is generally in millimeter level, size fluctuation is insensitive to deep drawing forming, influence is small, and forming quality can be guaranteed.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a method for manufacturing a forming die for reducing the height of a lug formed by drawing a sheet according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a three-dimensional data model of a female die of an initial forming die according to an embodiment of the present invention;
FIG. 3 is a schematic view of the initial forming die shown in FIG. 2 showing ear making conditions in different directions obtained after simulated drawing;
fig. 4 is a schematic structural diagram of a three-dimensional data model of a female die of a forming die after a rounded corner of the female die is revised according to an embodiment of the present invention;
FIG. 5 is a schematic view of ear making conditions in different directions obtained by simulated drawing of the forming die shown in FIG. 4 after modification of the fillet of the female die;
FIG. 6 is a schematic structural diagram of a three-dimensional data model of a forming mold after fillet correction and design according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an anisotropic adjustment method for a matching material of a rotary concave die of a forming die according to an embodiment of the present invention;
fig. 8 is a schematic view of an assembly structure of a rotary female die of a forming die according to an embodiment of the present invention.
Detailed Description
The embodiment of the application provides a forming die for reducing the lug making height in sheet drawing forming and a preparation method thereof, and solves the technical problem that the lug making defect control effect in sheet drawing forming in the prior art is not ideal.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features of the embodiments and examples of the present application may be combined with each other without conflict.
Referring to fig. 1, a method for preparing a forming die for reducing the lug height in sheet drawing forming comprises the following steps:
manufacturing a three-dimensional data model of a forming die according to the product specification of a drawing part;
carrying out drawing forming simulation based on the three-dimensional data model by adopting a finite element simulation analysis method to obtain the ear making heights in different directions;
gradually enlarging the size of the die fillet in the larger position of the lug making according to the lug making height, promoting more materials to flow into the die until the inflowing materials counteract the lug making, and acquiring the revision value of the die fillet at the moment;
and adjusting the three-dimensional data model based on the revision value of the concave die fillet and preparing a forming die.
Referring to fig. 2 and fig. 3, a three-dimensional data model of a forming die is made according to the product specification of a drawn piece. And carrying out drawing forming simulation based on the three-dimensional data model by adopting a finite element simulation analysis method to obtain the ear making heights in different directions. In this embodiment, the three-dimensional data model of the initially manufactured forming die is theoretically designed according to the design specification of the workpiece, and the corresponding deep drawing simulation is also performed according to the conventional deep drawing process.
Referring to fig. 4 and 5, in consideration of the actual ear making defect situation, by gradually enlarging the die fillet size at the larger position of the ear making, more material is forced to flow into the die until the inflowing material counteracts the ear making, and the revised value of the die fillet at this time is obtained. Thus, data information of the forming mold capable of suppressing the lug-making defect is obtained. And then adjusting the three-dimensional data model based on the revised value of the concave die fillet and preparing a forming die.
In consideration of the influence of specific environment when the equipment is arranged on a specific production line, the equipment is usually required to be debugged to obtain a good working state.
Thus, the preparation method further comprises:
and adjusting the azimuth angle of the die fillet according to the feeding direction to enable the lug making direction to be matched with the die fillet.
The preparation method adopts non-uniform deep drawing die fillets, specifically, the die fillet of an azimuth die with a larger lug is larger, the die fillet of a place with a smaller lug is smaller, and the relative positions of the die fillets with different sizes are changed in a matching manner to control the stress state of a plate material in a plane, so that the local yield deformation condition of the material is changed, the redistribution of the material is optimized, and the lug making rate of the material after deep drawing is reduced finally.
In order to facilitate the adjustment operation and improve the adjustment operation efficiency, the embodiment further provides a realization scheme of the mold.
A forming die for reducing the lug making height of sheet drawing forming is prepared by adopting the preparation method of the forming die for reducing the lug making height of sheet drawing forming; the structural scheme thereof will be specifically described below.
Referring to fig. 6, 7 and 8, a forming die for reducing the height of a lug for sheet drawing forming comprises: the device comprises an upper die holder 1, a female die holder 2, a rotary female die 4, a guide sleeve 10, a guide pillar 9, a lower die holder 8, a blank holder 6, a mandril 7 and a male die 5.
The upper die holder 1 and the lower die holder 8 are arranged in parallel, the guide sleeve 10 is fixed on the upper die holder 1, the guide pillar 9 is fixed on the lower die holder 8, and the guide pillar 9 is embedded in the guide sleeve 10, so that the distance between the upper die holder 1 and the lower die holder 8 is adjusted, the consistency of the stroke directions of the opposite movement of the upper die holder 1 and the lower die holder 8 is ensured, and the positioning accuracy of the die thereon is ensured.
The female die holder 2 is fixed on the upper die holder 1 and can be fixed by fasteners such as bolts and the like. Offer on the die holder 2 and be used for fixing the hole groove of rotatory die 4 to it is fixed can also be convenient for when rotatory die 4 rotates, the adjustment position angle, thereby promotes by a wide margin rotatory die 4 adapts to the adjustment operating efficiency of on-the-spot production line state.
In order to improve the reliability of the state maintenance of the rotary female die 4 and the product quality, a fastening screw hole is formed in the die holder 2, a fastening bolt 3 is arranged in the fastening screw hole, a circumferential groove is formed in the side wall of the rotary female die 4, the width of the circumferential groove is slightly larger than the diameter of the end of the fastening bolt 3, so that the end of the fastening bolt 3 can be embedded in the circumferential groove and radially compressed along the rotary female die 4, and the stability of the rotary female die 4 in the working state is improved.
And the blank holder 6 is fixed on the lower die holder 8 through the ejector rod 7, and the male die 5 is fixed on the lower die holder 8 and is opposite to the rotary female die 4. The male die 5 is arranged in the center of the blank holder 6.
The embodiment of the invention controls the material inflow resistance by controlling the size of the fillet of the drawing female die of the die and matching the installation direction of the die, thereby controlling the size of the lug.
This example provides a specific embodiment for illustration.
The material used in this example was a 0.8mm thick DX56D + Z material, the blank was a disc with a diameter of 115mm, the die punch diameter was 50mm, the conventional die fillet was 6.4mm, and the lug height, i.e. the edge line size difference, was required to be less than 0.5 mm.
And designing a drawing female die with a set fillet, and acquiring the ear making condition through a finite element simulation analysis result.
Referring to fig. 3 and 5, according to the finite element simulation result, the fillet of the region with the higher lug making is kept unchanged, the minimum fillet of the region with the lower lug making is gradually reduced by 20%, and the transition region adopts a UG built-in algorithm to perform simulation calculation until the lug making height of the simulation result meets the requirement. The original round angle is designed to be 6.4mm, two conditions of 5.1mm and 4.48mm are simulated by adjusting the round angles twice, the ear making rate is reduced from the original 2.19mm to 0.18mm, the reduction range reaches 91.8%, and the design requirement is met.
And designing a die fillet of the die according to the simulation result, and assembling the die fillet into the flexible die frame.
According to the feeding direction during stamping, the fillet orientation of the female die is changed, so that the purpose of adjusting the lug making orientation to be matched with the fillet of the die is achieved, and after the angle of the female die is determined, the die is pressed tightly through a set screw.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the forming die for reducing the lug making height in sheet drawing forming and the preparation method thereof, the lug making condition is obtained through three-dimensional modeling of the forming die and simulation of drawing forming; and then, the fillet of the female die is gradually adjusted to promote more materials to flow into the female die until the materials flowing in counteract the lug making, and the revision value of the fillet of the female die is obtained at the moment, so that the three-dimensional data of the forming die for inhibiting the lug making defect is obtained to be used for preparing the solid die, and the lug making defect can be inhibited in the actual production. Meanwhile, the fillet machining size of the concave die is generally in the millimeter level, size fluctuation is insensitive to deep drawing forming, influence is small, and forming quality is guaranteed.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. A preparation method of a forming die for reducing the lug forming height of sheet drawing forming is characterized by comprising the following steps:
manufacturing a three-dimensional data model of a forming die according to the product specification of a drawing part;
carrying out drawing forming simulation based on the three-dimensional data model by adopting a finite element simulation analysis method to obtain the ear making heights in different directions;
gradually enlarging the size of the die fillet in the larger position of the lug making according to the lug making height, promoting more materials to flow into the die until the inflowing materials counteract the lug making, and acquiring the revision value of the die fillet at the moment;
and adjusting the three-dimensional data model based on the revision value of the concave die fillet and preparing a forming die.
2. The method for preparing a forming die for reducing the lug height in sheet drawing forming according to claim 1, wherein the method further comprises:
and adjusting the azimuth angle of the die fillet according to the feeding direction to enable the lug making direction to be matched with the die fillet.
3. A forming die for reducing the lug height in sheet drawing, characterized by being produced by the method for producing a forming die for reducing the lug height in sheet drawing according to any one of claims 1 to 2.
4. The forming die for reducing the lug height in sheet drawing forming according to claim 3, comprising: the device comprises an upper die base, a female die base, a rotary female die, a guide sleeve, a guide pillar, a lower die base, a blank holder, an ejector rod and a male die;
the upper die holder and the lower die holder are arranged in parallel, the guide sleeve is fixed on the upper die holder, the guide pillar is fixed on the lower die holder, and the guide pillar is embedded in the guide sleeve;
the female die holder is fixed on the upper die holder, and the rotary female die is fixed in a hole groove formed in the female die holder;
a fastening screw hole is formed in the die holder, a fastening bolt is arranged in the fastening screw hole, a circumferential groove is formed in the side wall of the rotary female die, and the end of the fastening bolt can be embedded in the circumferential groove and tightly press the rotary female die along the radial direction of the rotary female die;
the blank holder is fixed on the lower die holder through the ejector rod, the male die is fixed on the lower die holder and is opposite to the rotary female die, and the male die is arranged in the center of the blank holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011061964.9A CN112275879B (en) | 2020-09-30 | 2020-09-30 | Forming die for reducing lug making height of sheet drawing forming and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011061964.9A CN112275879B (en) | 2020-09-30 | 2020-09-30 | Forming die for reducing lug making height of sheet drawing forming and preparation method thereof |
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| CN112275879A true CN112275879A (en) | 2021-01-29 |
| CN112275879B CN112275879B (en) | 2022-04-19 |
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| CN202011061964.9A Active CN112275879B (en) | 2020-09-30 | 2020-09-30 | Forming die for reducing lug making height of sheet drawing forming and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113084006A (en) * | 2021-04-02 | 2021-07-09 | 中北大学 | Step-by-step extrusion die capable of effectively reducing box forming load |
| CN113894242A (en) * | 2021-09-16 | 2022-01-07 | 济源市天合特钢锻压有限公司 | Roller and forging and pressing forming process thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090105861A1 (en) * | 2000-05-11 | 2009-04-23 | Autoform Engineering Gmbh | Method for designing a tool for deep drawing and tool for deep drawing of sheet metal |
| CN103894495A (en) * | 2014-03-20 | 2014-07-02 | 成都极点精密模具有限公司 | Secondary drawing die |
| CN203804058U (en) * | 2014-05-14 | 2014-09-03 | 晋西工业集团有限责任公司 | Circumferentially-adjustable male die structure |
| CN104624790A (en) * | 2013-11-13 | 2015-05-20 | 哈尔滨建成集团有限公司 | Air rectification cap deep drawing die with deep drawing beads |
| CN110802154A (en) * | 2019-11-21 | 2020-02-18 | 湖南工业大学 | Deep drawing method for reducing lug making rate by variable-gap die |
| CN110814145A (en) * | 2019-11-21 | 2020-02-21 | 湖南工业大学 | Method for reducing lug forming rate of drawn part |
| CN110826280A (en) * | 2019-11-11 | 2020-02-21 | 常州东风轴承有限公司 | Process optimization method for improving cylindrical part drawing lug based on finite element simulation |
| CN210701942U (en) * | 2019-07-19 | 2020-06-09 | 武汉飞特电气有限公司 | Vacuum tube stainless steel end cover stretch forming die |
-
2020
- 2020-09-30 CN CN202011061964.9A patent/CN112275879B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090105861A1 (en) * | 2000-05-11 | 2009-04-23 | Autoform Engineering Gmbh | Method for designing a tool for deep drawing and tool for deep drawing of sheet metal |
| CN104624790A (en) * | 2013-11-13 | 2015-05-20 | 哈尔滨建成集团有限公司 | Air rectification cap deep drawing die with deep drawing beads |
| CN103894495A (en) * | 2014-03-20 | 2014-07-02 | 成都极点精密模具有限公司 | Secondary drawing die |
| CN203804058U (en) * | 2014-05-14 | 2014-09-03 | 晋西工业集团有限责任公司 | Circumferentially-adjustable male die structure |
| CN210701942U (en) * | 2019-07-19 | 2020-06-09 | 武汉飞特电气有限公司 | Vacuum tube stainless steel end cover stretch forming die |
| CN110826280A (en) * | 2019-11-11 | 2020-02-21 | 常州东风轴承有限公司 | Process optimization method for improving cylindrical part drawing lug based on finite element simulation |
| CN110802154A (en) * | 2019-11-21 | 2020-02-18 | 湖南工业大学 | Deep drawing method for reducing lug making rate by variable-gap die |
| CN110814145A (en) * | 2019-11-21 | 2020-02-21 | 湖南工业大学 | Method for reducing lug forming rate of drawn part |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113084006A (en) * | 2021-04-02 | 2021-07-09 | 中北大学 | Step-by-step extrusion die capable of effectively reducing box forming load |
| CN113084006B (en) * | 2021-04-02 | 2023-04-25 | 中北大学 | Step extrusion method for effectively reducing box body forming load |
| CN113894242A (en) * | 2021-09-16 | 2022-01-07 | 济源市天合特钢锻压有限公司 | Roller and forging and pressing forming process thereof |
| CN113894242B (en) * | 2021-09-16 | 2024-02-20 | 济源市天合特钢锻压有限公司 | Roller and forging forming process thereof |
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| CN112275879B (en) | 2022-04-19 |
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