CN111957802A - Differential temperature drawing process method - Google Patents
Differential temperature drawing process method Download PDFInfo
- Publication number
- CN111957802A CN111957802A CN202010746687.9A CN202010746687A CN111957802A CN 111957802 A CN111957802 A CN 111957802A CN 202010746687 A CN202010746687 A CN 202010746687A CN 111957802 A CN111957802 A CN 111957802A
- Authority
- CN
- China
- Prior art keywords
- blank
- temperature
- drawing process
- process method
- differential temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- 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
-
- 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
- B21D37/16—Heating or cooling
Abstract
The invention discloses a differential temperature drawing process method, and belongs to the technical field of machining and devices. When the blank is drawn, the coil is wound inside the blank holder, the coil is electrified, eddy current is generated inside the blank according to the electromagnetic induction principle, the blank is heated, and meanwhile, cooling liquid is arranged inside the male die, so that the temperature of the blank at the blank holder is high, and the temperature at the round angle of the male die is low, and therefore differential temperature drawing is achieved. According to the invention, the slab is heated by electromagnetic induction, eddy current is generated in the slab, and the plasticity of the slab can be further improved and the deformation resistance of the slab can be reduced according to the electro-plasticity principle; and the electromagnetic induction heating method has high heating efficiency and is easy to realize temperature control.
Description
Technical Field
The invention relates to a differential temperature deep drawing process method, which is used in the technical field of machining and devices.
Background
The deep drawing process is widely applied to industries such as automobiles, airplanes, aerospace and the like. With the development of the industry, drawn parts are often required to have lighter weight and higher strength, so that materials such as high-strength steel, aluminum alloy, magnesium alloy and the like are widely applied. However, the material has poor plasticity at normal temperature and is difficult to form; however, as the temperature increases, the plastic property tends to be better in a certain temperature range, and thus the hot drawing is developed. Thermal drawing can be divided into isothermal drawing and differential drawing. The isothermal drawing is a drawing process in which a male die, a female die, a blank holder and a blank are heated to the same temperature. The differential temperature drawing is a drawing process by setting different temperatures of different areas (a flange and a convex die fillet) of a plate blank. In practice, differential drawing tends to have a greater draw ratio and is therefore more widely used. In the existing differential temperature deep drawing process, a blank holder is heated by adopting a resistance heating mode, and then a plate blank is heated through heat conduction; and a liquid cooling system or a gas cooling system is arranged in the male die, so that differential temperature drawing is realized. However, the differential temperature drawing method has low heating efficiency and causes energy waste. Therefore, a new differential temperature drawing process is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a differential temperature drawing process method, wherein the plate blank is heated by electromagnetic induction, eddy current is generated inside the plate blank, and the plasticity of the plate blank can be further improved and the deformation resistance of the plate blank can be reduced according to the electro-plasticity principle; and the electromagnetic induction heating method has high heating efficiency and is easy to realize temperature control.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
when the plate blank is drawn, the coil is wound inside the blank holder, the coil is electrified, eddy current is generated inside the plate blank according to the electromagnetic induction principle, heating is carried out, meanwhile, cooling liquid is arranged inside the male die, the temperature of the plate blank at the blank holder is high, the temperature of the round angle of the male die is low, and therefore differential temperature drawing is achieved.
The technical scheme of the invention is further improved as follows: the inside of blank holder is provided with the ring shape cavity and the inside winding equidistant coil of cavity.
The technical scheme of the invention is further improved as follows: and a cooling liquid channel is arranged in the male die and is filled with cooling liquid.
The technical scheme of the invention is further improved as follows: the method comprises the following specific steps:
s1, fixing a female die with the middle part recessed downwards to form a groove, placing a plate blank at the top of the female die, placing a blank holder at the upper end of the plate blank, giving a certain blank holder force to the plate blank, and simultaneously placing a male die above the plate blank corresponding to the groove;
s2, introducing high-frequency alternating current into the coil, and heating the plate blank according to the electromagnetic induction principle;
and S3, when the plate blank is heated to the temperature H, the coil is continuously electrified, the male die rapidly moves downwards, and drawing is completed.
The technical scheme of the invention is further improved as follows: the blank holder is made of ceramic.
The technical scheme of the invention is further improved as follows: and in the step S1, the edge pressing force is 0.1MPa to 100 MPa.
The technical scheme of the invention is further improved as follows: in the step S2, the frequency of the high-frequency ac current is 50HZ to 10 KHZ.
The technical scheme of the invention is further improved as follows: the temperature H in the step S3 is in the range of 30-800 ℃.
The technical scheme of the invention is further improved as follows: and a temperature sensor for measuring the temperature H is arranged at the contact position of the top end of the female die and the plate blank.
Due to the adoption of the technical scheme, the invention has the technical progress that:
(1) the traditional resistance heating is changed into electromagnetic induction heating, so that the heating efficiency is greatly improved.
(2) Eddy current is generated in the plate blank by electromagnetic induction heating, and the plasticity of the plate blank is further improved, the deformation resistance of the plate blank is reduced, and the drawing ratio is improved by an electro-plasticity principle.
(3) The electromagnetic induction heating temperature is easy to control, the automation of the heating engineering is easy to realize, the management is convenient, the manpower is saved, and the production efficiency is improved.
Drawings
FIG. 1 is an isometric view of a blank holder with a coil in accordance with the present invention;
FIG. 2 is a cross-sectional view of a blank holder with coils according to the present invention;
FIG. 3 is a cross-sectional view of a blank holder of the present invention;
FIG. 4 is a top view of the coil of the present invention;
FIG. 5 is an isometric view of a coil of the present invention;
FIG. 6 is a front view of the drawing die of the present invention;
figure 7 is a cross-sectional view of a drawing die of the present invention;
FIG. 8 is an isometric view of a rectangular blank holder of the present invention;
FIG. 9 is a cross-sectional view of a rectangular blank holder with coils according to the present invention;
the cooling device comprises a cooling liquid 1, a blank holder 2, a blank holder 3, a coil 4, a cavity 5, a male die 6, a plate blank 7 and a female die.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
when a plate blank 6 is drawn, a coil 3 is wound inside a blank holder 2, the coil 3 is electrified, eddy current is generated inside the plate blank 6 according to the electromagnetic induction principle, heating is carried out, and meanwhile, cooling liquid 1 is arranged inside a male die 5, so that the temperature of the plate blank 6 at the blank holder 2 is high, and the temperature of the round angle of the male die 5 is low, and therefore differential temperature drawing is achieved.
Example 1
As shown in fig. 1 to 7, the differential temperature drawing of a cylindrical member is performed by the following steps:
s1, the ceramic does not shield a magnetic field, the ceramic does not perform induction heating, the strength of some special ceramics can reach 40-100Mpa, and the blank holder force is often within 30Mpa, so the annular blank holder 2 made of the ceramic material is selected; a circular cavity 4 is arranged in the blank holder 2, and coils 3 at equal intervals are wound in the cavity 4;
s2, fixing a female die 7 with the middle part recessed downwards to form a groove, placing a plate blank 6 on the top of the female die 7, placing a blank holder 2 on the upper end of the plate blank 6, giving a certain blank holding force to the plate blank 6, and simultaneously placing a male die 5 above the plate blank 6 corresponding to the groove;
s3, introducing high-frequency alternating current with a certain size into the coil 3 to generate a rapidly-changing magnetic field, so that eddy current is generated inside the plate blank 6, and the plate blank 6 is heated;
and S4, filling the cooling liquid 9 in the cooling liquid channel in the male die 5, and when the male die 5 is heated to the required temperature, continuing electrifying the coil 3, and rapidly moving the male die 5 downwards to finish drawing.
The male die 5 is cooled by liquid, and the male die is in contact with the plate blank 6 and mutually conducts heat, so that the temperature of the plate blank 6 at the blank holder 2 is high, the temperature of the round angle of the male die 5 is low, and the difference temperature is realized.
Example 2
When the box-shaped part is deep-drawn, the blank holder 2 is selected to be rectangular, a circular cavity is reserved inside the blank holder, the coil 3 is wound in the cavity, as shown in fig. 8-9, and then the deep-drawing is performed according to the steps of the embodiment 1.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. It will be apparent to those skilled in the art that other variations or modifications can be made based on the above description, such as by selecting a blank holder 2, a punch 5 and a die 7 having corresponding shapes for drawing a drawn part having different shapes. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (9)
1. A differential temperature deep drawing process method is characterized in that: when deep-drawing is carried out to blank (6), through at inside winding coil (3) of blank holder (2), to circular telegram in coil (3), make inside vortex that produces of blank (6) according to the electromagnetic induction principle, heat, set up coolant liquid (1) simultaneously in terrace die (5) inside for blank (6) temperature of blank holder (2) department is high, and the temperature of terrace die (5) fillet department is low, thereby realizes the differential temperature deep-drawing.
2. The differential temperature drawing process method according to claim 1, characterized in that: the inside of blank holder (2) is provided with cavity (4) and the inside winding equidistant coil (3) of cavity (4).
3. The differential temperature drawing process method according to claim 2, characterized in that: and a cooling liquid channel is arranged in the male die (5), and the cooling liquid channel is filled with cooling liquid (1).
4. The differential temperature drawing process method according to claim 3, characterized in that: the method comprises the following specific steps:
s1, fixing a female die (7) with the middle part recessed downwards to form a groove, placing a plate blank (6) on the top of the female die (7), placing a blank holder (2) on the upper end of the plate blank (6), giving a certain blank holder force to the plate blank (6), and simultaneously placing a male die (5) above the plate blank (6) corresponding to the groove;
s2, introducing high-frequency alternating current into the coil (3), and heating the plate blank (6) according to the electromagnetic induction principle;
and S3, when the plate blank (6) is heated to the temperature H, the coil (3) is electrified continuously, the male die (5) moves downwards rapidly, and drawing is completed.
5. The differential temperature drawing process method according to claim 4, characterized in that: the blank holder (2) is made of ceramic.
6. The differential temperature drawing process method according to claim 4, characterized in that: and in the step S1, the edge pressing force is 0.1MPa to 100 MPa.
7. The differential temperature drawing process method according to claim 4, characterized in that: in the step S2, the frequency of the high-frequency ac current is 50HZ to 10 KHZ.
8. The differential temperature drawing process method according to claim 4, characterized in that: the temperature H in the step S3 is in the range of 30-800 ℃.
9. The differential temperature drawing process method according to claim 8, characterized in that: and a temperature sensor for measuring the temperature H is arranged at the position where the top end of the female die (7) is contacted with the slab (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010746687.9A CN111957802A (en) | 2020-07-29 | 2020-07-29 | Differential temperature drawing process method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010746687.9A CN111957802A (en) | 2020-07-29 | 2020-07-29 | Differential temperature drawing process method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111957802A true CN111957802A (en) | 2020-11-20 |
Family
ID=73363635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010746687.9A Pending CN111957802A (en) | 2020-07-29 | 2020-07-29 | Differential temperature drawing process method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111957802A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112974580A (en) * | 2021-05-11 | 2021-06-18 | 四川英创力电子科技股份有限公司 | Bent circuit board and processing equipment and method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4532793A (en) * | 1982-09-27 | 1985-08-06 | Kraftwerk Union Aktiengesellschaft | Method for deep-drawing sheet metal and an apparatus for carrying out the method |
| JP2008173655A (en) * | 2007-01-17 | 2008-07-31 | Nagaoka Univ Of Technology | Deep drawing apparatus |
| CN101332540A (en) * | 2008-07-30 | 2008-12-31 | 山东大学 | Bulk-heating sheet laser pressing method and device |
| CN106180419A (en) * | 2016-09-21 | 2016-12-07 | 北京普惠三航科技有限公司 | A kind of slab differential temperature drawing shapes with die, mould, device and method for drawing |
| CN208373944U (en) * | 2018-04-25 | 2019-01-15 | 南京航空航天大学 | A kind of cooling electric pulse thermal forming device of aluminum alloy synchronous |
| 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 |
| CN110394391A (en) * | 2019-04-09 | 2019-11-01 | 哈尔滨理工大学 | A kind of device and method improving magnesium alloy Deep-drawing property using Two-dimensional current field |
-
2020
- 2020-07-29 CN CN202010746687.9A patent/CN111957802A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4532793A (en) * | 1982-09-27 | 1985-08-06 | Kraftwerk Union Aktiengesellschaft | Method for deep-drawing sheet metal and an apparatus for carrying out the method |
| JP2008173655A (en) * | 2007-01-17 | 2008-07-31 | Nagaoka Univ Of Technology | Deep drawing apparatus |
| CN101332540A (en) * | 2008-07-30 | 2008-12-31 | 山东大学 | Bulk-heating sheet laser pressing method and device |
| CN106180419A (en) * | 2016-09-21 | 2016-12-07 | 北京普惠三航科技有限公司 | A kind of slab differential temperature drawing shapes with die, mould, device and method for drawing |
| CN208373944U (en) * | 2018-04-25 | 2019-01-15 | 南京航空航天大学 | A kind of cooling electric pulse thermal forming device of aluminum alloy synchronous |
| CN110394391A (en) * | 2019-04-09 | 2019-11-01 | 哈尔滨理工大学 | A kind of device and method improving magnesium alloy Deep-drawing property using Two-dimensional current field |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112974580A (en) * | 2021-05-11 | 2021-06-18 | 四川英创力电子科技股份有限公司 | Bent circuit board and processing equipment and method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8230713B2 (en) | Elevated temperature forming die apparatus | |
| CN107139517B (en) | A kind of drawing and forming device and method of the non-axisymmetric parts of difficult-to-deformation material | |
| CN105215160A (en) | A kind of multistation Continuous Heat stamping line and method | |
| US8375758B1 (en) | Induction forming of metal components with slotted susceptors | |
| CN111957802A (en) | Differential temperature drawing process method | |
| CN104874663B (en) | A kind of increment type temperature difference expanding method of metal pipe material | |
| CN104384701B (en) | Magnesium alloy based on sensing heating and electro-magnetic forming/carbon steel pipe fitting composite connecting method | |
| CN104259303A (en) | Incremental forming method of local heating plate beyond machining point | |
| Behrens et al. | Development of the heating and forming strategy in compound forging of hybrid steel‐aluminum parts | |
| CN105118653A (en) | Manufacturing method for amorphous alloy core used for motor and transformer | |
| CN203027520U (en) | Induction heating devices for annular metal pieces and cup-shaped metal pieces | |
| CN104907472A (en) | Forging forming method for high temperature alloy frame-shaped piece | |
| CN113894236A (en) | Vacuum isothermal die forging rapid prototyping device | |
| Tian et al. | Heating schemes and process parameters of induction heating of aluminium sheets for hot stamping | |
| CN104907420A (en) | Medium-thick plate differential thermal volume forming device and process | |
| CN211621014U (en) | Honeycomb type electric permanent magnet fast mode locking device and paper pulp molding forming equipment thereof | |
| CN107401922A (en) | Blank heating device in aluminium alloy semi-solid thixotropic forming | |
| CN207299918U (en) | Blank heating device in aluminium alloy semi-solid thixotropic forming | |
| CN202006264U (en) | Die for isothermal forging | |
| CN104372309A (en) | Heating device, reaction cavity, and plasma processing equipment | |
| CN113255191A (en) | Equivalent circuit parameter identification method of induction heating model | |
| CN103433384A (en) | Controllable variable-temperature combined multiple-punch forming device for high-strength steel plates | |
| CN209517548U (en) | Electromagnetic induction heating motor and heating system | |
| CN105632674A (en) | Method for sintering neodymium iron boron magnetic tile and spark plasma sintering device thereof | |
| CN107249227B (en) | Heating device and heating method for motor oil seal hot jacket |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201120 |
|
| RJ01 | Rejection of invention patent application after publication |