CN114474413A - Preparation method of graphite electrode for processing porous extrusion die - Google Patents
Preparation method of graphite electrode for processing porous extrusion die Download PDFInfo
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- CN114474413A CN114474413A CN202111595504.9A CN202111595504A CN114474413A CN 114474413 A CN114474413 A CN 114474413A CN 202111595504 A CN202111595504 A CN 202111595504A CN 114474413 A CN114474413 A CN 114474413A
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- graphite
- electrode
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- processing
- size
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 63
- 239000010439 graphite Substances 0.000 title claims abstract description 63
- 238000001125 extrusion Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 238000003754 machining Methods 0.000 claims abstract description 11
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 4
- 230000001070 adhesive effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 238000003801 milling Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 239000010949 copper Substances 0.000 description 9
- 239000007770 graphite material Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/04—Electrodes specially adapted therefor or their manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
Abstract
The invention relates to a preparation method of a graphite electrode for processing a porous extrusion die, which comprises the following steps: (a) processing a graphite raw material into an electrode support, wherein the size of the electrode support is larger than that of a die hole distribution area on a porous extrusion die; (b) processing a plurality of notches matched with the distribution positions of the die holes on the surface of the electrode support; (c) selecting graphite raw materials with proper sizes as graphite columns, respectively embedding the graphite columns into the notches, and bonding and fixing the graphite columns in the notches by using a conductive adhesive; (d) processing a secondary electrode on the graphite column; (e) processing a primary electrode on the upper part of the graphite column; (f) and machining high and low points matched with the working band on the top surface of the primary electrode. The preparation method of the graphite electrode has the advantages of saving raw materials, reducing cost and improving preparation efficiency.
Description
Technical Field
The invention relates to the field of processing and manufacturing of extrusion dies, in particular to a preparation method of a graphite electrode for processing a porous extrusion die.
Background
In extrusion die machining, precision discharge is an indispensable process and is also a very important process. As is known, the discharge necessitates the use of electrodes, which are generally of two materials: copper and graphite. Among them, copper is widely used as an electrode material in electric discharge machining in a die factory, but the copper material is a non-renewable resource and the price trend is more and more expensive; meanwhile, for the processing and manufacturing of the porous extrusion die, if a copper electrode is used, a specific jig needs to be manufactured and a plurality of copper electrodes need to be manufactured, so that the time consumption is long, and the efficiency is low. On the other hand, the graphite material has a lower density than copper, the copper electrode with the same volume is 5 times of the weight of the graphite electrode, and the electrode with the larger volume is too heavy, which causes the problems of inconvenient clamping, easy deflection and displacement during machining, and the like.
The manufacturing method of the graphite electrode usually cuts and processes the required bottom plate and electrode shape from a whole block of cubic graphite raw material, which not only causes the waste of raw materials, but also has long required processing time and lower manufacturing efficiency.
Disclosure of Invention
In view of the above problems, the technical problem to be solved by the present invention is to provide a method for manufacturing a graphite electrode for processing a porous extrusion die, so as to improve the manufacturing efficiency and save the manufacturing cost.
The technical means adopted by the invention are as follows.
A preparation method of a graphite electrode for processing a porous extrusion die comprises the following steps:
(a) processing the graphite raw material into an electrode support by using a cutting machine, wherein the size of the electrode support is larger than that of a die hole distribution area on a porous extrusion die;
(b) processing a plurality of notches matched with the distribution positions of the die holes on the porous extrusion die on the surface of the electrode support by using a carving and milling machine, wherein the size of each notch is larger than that of each die hole;
(c) selecting a graphite raw material matched with the size of the die hole as a graphite column, respectively embedding the graphite columns into the notches, and respectively bonding and fixing the graphite columns in the notches by using a conductive adhesive;
(d) processing a secondary electrode on the graphite column by using an engraving and milling machine, wherein the cross-sectional shape of the secondary electrode is geometrically similar to the shape of the die hole;
(e) processing a primary electrode on the upper part of the graphite column by using a carving and milling machine, wherein the cross section of the primary electrode is the same as the shape and the size of the die hole;
(f) machining high and low points matched with the die hole working band on the top surface of the primary electrode by using a carving and milling machine;
wherein the sectional shape size of the secondary electrode is larger than that of the primary electrode.
Preferably, the electrode holder has a thickness of 10 mm.
Optionally, the cross section of the notch is circular, and the graphite column is cylindrical; the section diameter of the notch is about 0.5mm larger than the diameter of the graphite column.
Optionally, the cross section of the notch is pitch-shaped, and the graphite column is cubic.
Preferably, the depth of the recess is 3 mm.
The technical effects produced by the present invention are as follows.
1. Compared with the conventional copper electrode, the graphite material tends to be stable in price, and meanwhile, the graphite has good machining performance and the cutting resistance is only 1/4 of copper. The unique grain organization structure of graphite material for can not produce the burr after the electrode mills the shaping, can directly satisfy the operation requirement when not being convenient for the deburring to complicated molding, save the artifical process that carries out the polishing to the electrode, avoided the deformation and the dimensional error that the polishing leads to.
2. Compared with the existing graphite electrode preparation method, the preparation method only needs to use a thin graphite material as an electrode support, and then fixes the single graphite column in an embedding mode. Compared with the conventional method, the method can save more than 60% of the cost of the graphite raw material, and simultaneously the manufacturing efficiency can be improved to more than 70%.
Drawings
FIG. 1: an example of a porous extrusion die.
Fig. 2 to 4: the graphite electrode for processing the mold shown in fig. 1 was prepared according to an example of the preparation method of the present invention, and the intermediate structure formed in each step of the preparation process is schematically shown.
FIG. 5: a schematic view of a graphite electrode for processing a mold shown in fig. 1, prepared according to an embodiment of the preparation method of the present invention.
FIG. 6: according to another embodiment of the preparation method, the prepared electrode support and the notch structure thereof are schematic.
Detailed Description
As mentioned above, the mold manufactured by the method for manufacturing a graphite electrode of the present invention is mainly directed to a porous extrusion mold, for example, a porous extrusion mold 10 shown in fig. 1, which includes 5 mold holes 11. With respect to the porous extrusion die 10, the specific steps for preparing the graphite electrode for processing the die according to the preparation method of the present invention may be as follows.
(a) The graphite feedstock (e.g., 100MM by 100MM length and width and 500MM thickness) is processed into electrode holders 1 of desired dimensions using a suitable cutting machine (e.g., a sawing machine), which are larger than the dimensions of the distribution of die holes 11 in the multi-hole extrusion die 10. Wherein, the thickness of the electrode support 1 can be selected to be about 10mm, thus ensuring the strength of the electrode support 1 and saving raw materials. While the distribution area of the die holes 11 on the multi-hole extrusion die 10 can be understood as the area circled by the dotted line in the die structure shown in fig. 1, the size of the electrode holder 1 only needs to be slightly larger than the area, that is, a whole graphite raw material can be actually divided into a plurality of such electrode holders, so that the utilization rate of the raw material is maximized.
(b) A plurality of recesses 2 matching the distribution of the die holes 11 in the porous extrusion die 10 are machined in the surface of the electrode holder 1 using an engraving and milling machine or any other suitable graphite machining machine, the recesses 2 being rectangular in cross-section in the present embodiment, as shown in fig. 2. Wherein, the size of each notch 2 can be slightly larger than the size of the die hole 11, and the depth of the notch 2 can be selected to be about 3 mm.
(c) Selecting a graphite raw material matched with the size of the die hole 11 as the graphite column 3, respectively embedding the plurality of graphite columns 3 into the notches 2, and respectively and correspondingly bonding and fixing the graphite columns 3 in the notches 2 by using a conductive adhesive. In order to adapt to the shape of the notch 2, as shown in fig. 3, the graphite column 3 in this embodiment is cubic when selecting the material.
(d) A secondary electrode 32 is machined on the graphite pillar 3 by using an engraving and milling machine, and the cross-sectional shape of the secondary electrode 32 is geometrically similar to the shape of the die hole 11, which can be seen together in fig. 1 and 4.
(e) A primary electrode 31 is machined on the upper part of the graphite column 3 by using an engraving and milling machine, and the cross-sectional shape of the primary electrode 31 is the same as the shape and the size of the die hole 11, as shown in fig. 5. Since the graphite material itself is brittle, and the finer the graphite pillar will result in lower strength, the cross-sectional dimension of the secondary electrode 32 should be larger than that of the primary electrode 31 to ensure the overall strength of the graphite electrode.
(f) And (3) machining high and low points 33 matched with the working band of the die hole 11 on the top surface of the primary electrode 31 by using an engraving and milling machine to obtain the required graphite electrode.
In addition, with respect to the mold shown in fig. 1, according to another embodiment of the manufacturing method of the present invention, in step (b), the cross-sectional shape of the notch 2 machined in the electrode holder 1 may be circular (as shown in fig. 6), and then the graphite column 3 in step (c) may be preferably a cylindrical graphite rod when selecting materials. Meanwhile, the diameter of the cross section of the notch 2 may be selected to be about 0.5mm larger than the diameter of the selected graphite column 3.
Claims (6)
1. A preparation method of a graphite electrode for processing a porous extrusion die is characterized by comprising the following steps:
(a) machining a graphite raw material into an electrode support (1) by using a cutting machine, wherein the size of the electrode support is larger than the size of a distribution area of die holes (11) on a porous extrusion die (10);
(b) processing a plurality of notches (2) matched with the distribution positions of all die holes (11) on a porous extrusion die (10) on the surface of an electrode support (1) by using a carving and milling machine, wherein the size of each notch (2) is larger than that of each die hole (11);
(c) selecting graphite raw materials matched with the size of the die holes (11) as graphite columns (3), respectively embedding the graphite columns (3) into the notches (2), and respectively bonding and fixing the graphite columns (3) in the notches (2) by using a conductive adhesive;
(d) machining a secondary electrode (32) on the graphite column (3) by using an engraving and milling machine, wherein the cross-sectional shape of the secondary electrode (32) is geometrically similar to the shape of the die hole (11);
(e) processing a primary electrode (31) on the upper part of the graphite column (3) by using an engraving and milling machine, wherein the cross-sectional shape of the primary electrode (31) is the same as the shape and the size of the die hole (11);
(f) machining high and low points (33) matched with the working band of the die hole (11) on the top surface of the primary electrode (31) by using an engraving and milling machine;
wherein the sectional shape size of the secondary electrode (32) is larger than that of the primary electrode (31).
2. The method according to claim 1, wherein the thickness of the electrode holder (1) is 10 mm.
3. The method according to claim 1, wherein the cross-section of the recess (2) is circular and the graphite column (3) is cylindrical.
4. The method according to claim 1, wherein the cross-section of the recess (2) is pitch-shaped and the graphite column (3) is cube-shaped.
5. The method of claim 3 or 4, wherein the depth of the recess (2) is 3 mm.
6. The method of claim 3, wherein the cross-sectional diameter of the recess (2) is 0.5mm larger than the diameter of the graphite column (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111595504.9A CN114474413A (en) | 2021-12-24 | 2021-12-24 | Preparation method of graphite electrode for processing porous extrusion die |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111595504.9A CN114474413A (en) | 2021-12-24 | 2021-12-24 | Preparation method of graphite electrode for processing porous extrusion die |
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| Publication Number | Publication Date |
|---|---|
| CN114474413A true CN114474413A (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111595504.9A Pending CN114474413A (en) | 2021-12-24 | 2021-12-24 | Preparation method of graphite electrode for processing porous extrusion die |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115394470A (en) * | 2022-09-26 | 2022-11-25 | 歌尔股份有限公司 | Graphite electrode material preparation production line and working method thereof |
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|---|---|---|---|---|
| US4647748A (en) * | 1984-05-17 | 1987-03-03 | Smith International, Inc. | Graphite electrode construction and method of making |
| US20090033006A1 (en) * | 2007-07-31 | 2009-02-05 | Chin-Fu Horng | Processing method for graphite piece |
| CN201473604U (en) * | 2009-06-11 | 2010-05-19 | 贵阳铝镁设计研究院 | Mosaic cathode block |
| CN201552681U (en) * | 2009-11-10 | 2010-08-18 | 高佳太阳能股份有限公司 | Positioning plate used for cutting single crystal of eight inches |
| CN101864580A (en) * | 2010-07-08 | 2010-10-20 | 沈阳北冶冶金科技有限公司 | Aluminum electrolysis bath embedded with stud bumps on upper surface of cathode block |
| US20140158290A1 (en) * | 2011-12-07 | 2014-06-12 | Scott L. Boncha | Method for manufacturing multi-piece bonded graphite blanks for edm |
| KR102068631B1 (en) * | 2019-07-24 | 2020-01-21 | 양정윤 | Processing method of graphite block for mold |
| CN214443638U (en) * | 2020-12-31 | 2021-10-22 | 广州德志金属制品有限公司 | Graphite electrode structure and die casting die |
| CN113523460A (en) * | 2021-07-30 | 2021-10-22 | 四川科思精密模具股份有限公司 | Electrode base for machining ox horn rubber port of part and machining method |
| CN214516818U (en) * | 2021-01-28 | 2021-10-29 | 广东兴发铝业（江西）有限公司 | Porous extrusion die and combined electrode for processing working belt thereof |
-
2021
- 2021-12-24 CN CN202111595504.9A patent/CN114474413A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4647748A (en) * | 1984-05-17 | 1987-03-03 | Smith International, Inc. | Graphite electrode construction and method of making |
| US20090033006A1 (en) * | 2007-07-31 | 2009-02-05 | Chin-Fu Horng | Processing method for graphite piece |
| CN201473604U (en) * | 2009-06-11 | 2010-05-19 | 贵阳铝镁设计研究院 | Mosaic cathode block |
| CN201552681U (en) * | 2009-11-10 | 2010-08-18 | 高佳太阳能股份有限公司 | Positioning plate used for cutting single crystal of eight inches |
| CN101864580A (en) * | 2010-07-08 | 2010-10-20 | 沈阳北冶冶金科技有限公司 | Aluminum electrolysis bath embedded with stud bumps on upper surface of cathode block |
| US20140158290A1 (en) * | 2011-12-07 | 2014-06-12 | Scott L. Boncha | Method for manufacturing multi-piece bonded graphite blanks for edm |
| KR102068631B1 (en) * | 2019-07-24 | 2020-01-21 | 양정윤 | Processing method of graphite block for mold |
| CN214443638U (en) * | 2020-12-31 | 2021-10-22 | 广州德志金属制品有限公司 | Graphite electrode structure and die casting die |
| CN214516818U (en) * | 2021-01-28 | 2021-10-29 | 广东兴发铝业（江西）有限公司 | Porous extrusion die and combined electrode for processing working belt thereof |
| CN113523460A (en) * | 2021-07-30 | 2021-10-22 | 四川科思精密模具股份有限公司 | Electrode base for machining ox horn rubber port of part and machining method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115394470A (en) * | 2022-09-26 | 2022-11-25 | 歌尔股份有限公司 | Graphite electrode material preparation production line and working method thereof |
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