CN111360145A - Electric pulse auxiliary micro-stretching process for superfine crystal metal foil - Google Patents
Electric pulse auxiliary micro-stretching process for superfine crystal metal foil Download PDFInfo
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- CN111360145A CN111360145A CN202010095608.2A CN202010095608A CN111360145A CN 111360145 A CN111360145 A CN 111360145A CN 202010095608 A CN202010095608 A CN 202010095608A CN 111360145 A CN111360145 A CN 111360145A
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- Prior art keywords
- ultra
- metal foil
- micro
- fine grain
- 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
- B21D33/00—Special measures in connection with working metal foils, e.g. gold foils
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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
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/06—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves
Abstract
An electric pulse auxiliary micro-stretching process for ultra-fine grain metal foil uses a rolled ultra-fine grain metal foil strip as a raw material, and the ultra-fine grain metal foil strip is processed into a corresponding width according to the size of a deep stretching cup; the method can realize the room temperature preparation of the superfine crystal metal foil material micro deep drawing cup, and the obtained product has superfine crystal grains, so the thickness is thinner, the performance is better, the weight of the existing metal material micro deep drawing cup can be reduced, the quality and the service life of the micro deep drawing cup are improved, and the mechanical performance is greatly improved.
Description
Technical Field
The invention belongs to the technical field of metal material plastic forming, and particularly relates to an electric pulse auxiliary micro-stretching process for an ultra-fine grain metal foil.
Background
With the rapid development of the microelectronics field, the micro-forming field is receiving wide attention from the international society. Efforts have been made to produce high performance microforms by a variety of processes and techniques. Particularly, with the increase of the demand of people for weight reduction of workpieces, the demands for thickness reduction and performance improvement of foils are rapidly increased.
Ultra-fine grain metallic materials have been widely valued by researchers and engineers over the last two decades. The ultra-fine grain material is defined as the material when the average grain size is in the range of 100nm to 1 μm. The ultra-fine grain metal material has excellent properties which are not possessed by the traditional materials, such as high strength, high impact toughness, high strain rate, high creep resistance and the like. The severe plastic deformation is a main method for preparing the ultrafine grained metal material, and mainly comprises high-pressure torsion, equal channel angular extrusion, multidirectional forging, accumulative pack rolling, deep cooling asynchronous rolling and the like. The purpose is to shear the grain size to less than 1 μm, thereby obtaining an ultra-fine grained metal material.
The major bottleneck faced in the plastic working of ultra-fine grain metal materials is how to solve the conflict between the strength and the toughness of the materials, and macroscopically, the strength and the toughness are contradictory, and if higher strength is obtained, certain toughness must be sacrificed. How to realize that the ultra-fine grain metal foil does not break in the micro-forming manufacturing process is a strong demand and challenge for scientific research personnel and engineers. The plastic deformability of the material can be increased conventionally by heating, but the grain size of the material increases during heating, so that the strength of the material must be reduced. A part of metal materials, such as aluminum alloy materials, can have good plastic deformability without reducing the grain size through deep cooling processing. However, metal materials such as magnesium alloys and stainless steels cannot be formed by deep cooling because these materials are brittle in a deep cooling environment and cannot be formed plastically.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an electric pulse assisted micro-stretching process for an ultra-fine grain metal foil, so as to realize room temperature preparation of an ultra-fine grain metal foil micro-deep drawing cup and improve the product quality to a certain extent.
In order to achieve the purpose, the invention adopts the technical scheme that:
an electric pulse assisted micro-stretching process for an ultra-fine grain metal foil comprises the following steps:
the first step is as follows: the ultra-fine grain metal foil strip prepared by rolling is used as a raw material and processed into a corresponding width according to the size of a deep drawing cup;
the second step is that: placing the strip subjected to width processing on a crimping machine;
the third step: the strip is sent to a punching cutting machine through a driving roller and is processed into a disc;
the fourth step: respectively connecting the anode and the cathode of a pulse power supply to an upper die and a lower die of the micro-deep drawing equipment, starting the pulse power supply, wherein the current of the pulse power supply is 1-5000A, the pulse width is 50-100 mus, the frequency is 1-300Hz, and the parameter control of the pulse power supply is determined according to the material and the size of a disc;
and a sixth step: and placing the processed disc, and carrying out electric pulse assisted micro deep drawing deformation in a room temperature environment to produce the high-performance ultra-fine grain metal micro deep drawing cup.
The thickness of the ultra-fine grain metal foil strip is 4-300 μm.
The material of the ultra-fine grain metal foil strip is aluminum alloy, copper alloy, stainless steel or magnesium alloy.
Compared with the prior art, the invention can realize the room temperature preparation of the superfine crystal metal foil micro-drawing cup, and the obtained product has superfine crystal grains, thereby having thinner thickness and better performance, reducing the weight of the existing metal foil micro-drawing cup, improving the quality and the service life of the micro-drawing cup, and greatly improving the mechanical performance. The invention is suitable for preparing superfine crystal aluminum alloy, copper alloy, stainless steel, magnesium alloy and other micro deep drawing cups. The micro deep drawing cup has wide prospect in the fields of micro-electronics and the like.
Drawings
FIG. 1 is a schematic view of the preparation process of the present invention, wherein the upper dotted line frame is a continuous shearing process of the ultra-fine grain metal foil strip, and the lower dotted line frame is an electric pulse assisted micro-stretch forming process.
FIG. 2 is a schematic diagram showing the shape and size of the deep drawing die in example 1 of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
The invention relates to an electric pulse auxiliary micro-stretching process for an ultra-fine grain metal foil, which has the main principle that the toughness of the ultra-fine grain metal is greatly improved by utilizing the action of pulse current, and meanwhile, the temperature of the ultra-fine grain metal material is not greatly increased by the action of the pulse current, so that the grain size of the material is not changed after plastic forming. Thereby realizing that the material strength is not reduced and the plasticity is greatly improved. Meanwhile, the high-performance parts which are directly applied can be prepared by utilizing the micro deep drawing forming technology.
Referring to fig. 1, the specific steps of the present invention are as follows:
the first step is as follows: the ultra-fine grain metal foil strip 1 prepared by rolling is used as a raw material, and the thickness of the ultra-fine grain metal foil strip is between 4 and 300 mu m. The ultra-fine grain metal foil mainly comprises aluminum alloy, copper alloy, stainless steel, magnesium alloy and other materials.
The second step is that: the ultra-fine grain metal foil strip 1 is processed into a proper width according to the size of the deep drawing cup, and the width is adjusted according to the size of a part to be prepared.
The third step: the ultra-fine grained metal foil strip 1 is placed on a crimper.
The fourth step: the ultra-fine grain metal foil strip 1 is sent to a punching and cutting machine through a driving roller 2, and is processed into a disk sheet 5 with proper size under the action of an upper die 3 and a lower die 4 of the cutting machine.
The fifth step: and respectively connecting the positive electrode and the negative electrode of the pulse power supply 6 to an upper die 7 and a lower die 9 of the micro-drawing equipment. And starting the pulse power supply 6, wherein the current of the pulse power supply 6 is 1-5000A, the pulse width is 50-100 mus, the frequency is 1-300Hz, and the parameter control of the pulse power supply is determined according to the material and the size of the disc.
And a sixth step: the processed disc piece 5 is placed between an upper die 7 and a lower die 9, a micro-stretching pressure pad 8 made of an insulator is arranged on the pad, and electric pulse auxiliary micro-deep drawing deformation is carried out at room temperature to produce the high-performance ultra-fine grain metal micro-deep drawing cup 10.
In an embodiment 1 of the present invention, an ultra-fine grain T2 copper foil having an average grain size of 300nm and a thickness of 0.1mm is used as a raw material, the width thereof is processed to 1.3mm, the raw material is processed into a disk sheet having a diameter of 1.1mm by using a die cutter, the current of a pulse power supply is 1000A, the pulse width is 50 μ s, the frequency is 200Hz, and the shape and size of a die refer to fig. 2, thereby finally obtaining an ultra-fine grain T2 copper drawing cup having a diameter of 0.8mm, and a cup height of about 0.2 mm. The grain size of the stretching cup prepared by room temperature pulse current assisted micro deep drawing deformation is still 300nm, and the strength of the material is kept.
Claims (3)
1. An electric pulse assisted micro-stretching process for an ultra-fine grain metal foil is characterized by comprising the following steps:
the first step is as follows: the ultra-fine grain metal foil strip prepared by rolling is used as a raw material and processed into a corresponding width according to the size of a deep drawing cup;
the second step is that: placing the strip subjected to width processing on a crimping machine;
the third step: the strip is sent to a punching cutting machine through a driving roller and is processed into a disc;
the fourth step: respectively connecting the positive electrode and the negative electrode of a pulse power supply to the upper die and the lower die of the micro-deep drawing equipment, and starting the pulse power supply, wherein the current of the pulse power supply is 1-5000A, the pulse width is 50-100 mus, and the frequency is 1-300 Hz;
and a sixth step: and placing the processed disc, and carrying out electric pulse assisted micro deep drawing deformation in a room temperature environment to produce the high-performance ultra-fine grain metal micro deep drawing cup.
2. The process of claim 1, wherein the ultra-fine grained metal foil strip has a thickness of 4 to 300 μm.
3. The electric pulse assisted micro-stretching process of the ultra-fine grained metal foil as claimed in claim 1 or 2, wherein the material of the ultra-fine grained metal foil strip is aluminum alloy, copper alloy, stainless steel or magnesium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010095608.2A CN111360145A (en) | 2020-02-17 | 2020-02-17 | Electric pulse auxiliary micro-stretching process for superfine crystal metal foil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010095608.2A CN111360145A (en) | 2020-02-17 | 2020-02-17 | Electric pulse auxiliary micro-stretching process for superfine crystal metal foil |
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| CN111360145A true CN111360145A (en) | 2020-07-03 |
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| CN202010095608.2A Pending CN111360145A (en) | 2020-02-17 | 2020-02-17 | Electric pulse auxiliary micro-stretching process for superfine crystal metal foil |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201098710Y (en) * | 2007-08-28 | 2008-08-13 | 汉达精密电子(昆山)有限公司 | Sheet metal punching device |
| CN201098711Y (en) * | 2007-08-28 | 2008-08-13 | 汉达精密电子(昆山)有限公司 | Sheet metal punching device |
| CN102172620A (en) * | 2011-02-09 | 2011-09-07 | 清华大学深圳研究生院 | Method and system for rolling difficult-to-machine metal material by combining electro-plasticity with temperature plasticity |
| CN102527830A (en) * | 2012-02-09 | 2012-07-04 | 上海交通大学 | Electroplastic incremental forming device and method for plates |
| CN102773328A (en) * | 2012-08-13 | 2012-11-14 | 江苏大学 | Plastic working formation method for acquiring magnesium alloy forming member with large bulging height |
| CN105745035A (en) * | 2013-11-19 | 2016-07-06 | 新布里萨什肯联铝业 | Method for manufacturing brilliant metal sealing caps |
| CN106687231A (en) * | 2014-09-05 | 2017-05-17 | 新布里萨什肯联铝业 | Method of manufacturing textured-smooth hybrid metal closure caps |
| CN108817192A (en) * | 2018-04-25 | 2018-11-16 | 南京航空航天大学 | A kind of cooling electric pulse heat forming technology of aluminum alloy synchronous and device |
| CN110369600A (en) * | 2019-08-16 | 2019-10-25 | 中国人民解放军空军工程大学 | A kind of electric current loading method when pulse current auxiliary fine-edge blanking processing |
-
2020
- 2020-02-17 CN CN202010095608.2A patent/CN111360145A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201098710Y (en) * | 2007-08-28 | 2008-08-13 | 汉达精密电子(昆山)有限公司 | Sheet metal punching device |
| CN201098711Y (en) * | 2007-08-28 | 2008-08-13 | 汉达精密电子(昆山)有限公司 | Sheet metal punching device |
| CN102172620A (en) * | 2011-02-09 | 2011-09-07 | 清华大学深圳研究生院 | Method and system for rolling difficult-to-machine metal material by combining electro-plasticity with temperature plasticity |
| CN102527830A (en) * | 2012-02-09 | 2012-07-04 | 上海交通大学 | Electroplastic incremental forming device and method for plates |
| CN102773328A (en) * | 2012-08-13 | 2012-11-14 | 江苏大学 | Plastic working formation method for acquiring magnesium alloy forming member with large bulging height |
| CN105745035A (en) * | 2013-11-19 | 2016-07-06 | 新布里萨什肯联铝业 | Method for manufacturing brilliant metal sealing caps |
| CN106687231A (en) * | 2014-09-05 | 2017-05-17 | 新布里萨什肯联铝业 | Method of manufacturing textured-smooth hybrid metal closure caps |
| CN108817192A (en) * | 2018-04-25 | 2018-11-16 | 南京航空航天大学 | A kind of cooling electric pulse heat forming technology of aluminum alloy synchronous and device |
| CN110369600A (en) * | 2019-08-16 | 2019-10-25 | 中国人民解放军空军工程大学 | A kind of electric current loading method when pulse current auxiliary fine-edge blanking processing |
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Application publication date: 20200703 |