CN111136358A - Method for machining thin-wall array group holes - Google Patents
Method for machining thin-wall array group holes Download PDFInfo
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- CN111136358A CN111136358A CN201811298182.XA CN201811298182A CN111136358A CN 111136358 A CN111136358 A CN 111136358A CN 201811298182 A CN201811298182 A CN 201811298182A CN 111136358 A CN111136358 A CN 111136358A
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- hole
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- holes
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003754 machining Methods 0.000 title claims abstract description 15
- 238000010892 electric spark Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000011160 research Methods 0.000 abstract 1
- 238000004088 simulation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 238000003801 milling Methods 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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Classifications
-
- 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
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
- B23H9/14—Making holes
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses a method for processing a thin-wall array group hole, which aims at solving the problems of difficult processing, overlong processing time and the like of parts with thin-wall array group holes. The method starts from several aspects of process thought, flow design, machining process simulation, on-site machining of parts and the like, researches the process scheme of the parts to form an efficient machining mode of 'simplifying complicated parts and combining parts in a staggered way', and skillfully solves the problem that grouped electrodes are difficult to machine due to thin walls by utilizing a splitting method; the processing time is greatly shortened by using the grouped electrodes, the clamping times are reduced, the repeated positioning error caused by repeated clamping is effectively controlled by the reference conversion positioning sheet, and the high-efficiency and high-precision numerical control electric spark forming processing is realized.
Description
Technical Field
The invention relates to a method in the technical field of special machining, in particular to a method for processing thin-wall array group holes by electric spark forming.
Background
The electric spark forming processing technology can process various materials with high melting point, high hardness, high strength, high purity and high toughness, has high energy density of pulse discharge, is convenient for processing special materials and workpieces with complex shapes which are difficult to process and cannot be processed by using a common mechanical processing method, and is not influenced by material hardness and heat treatment conditions. The pulse discharge has extremely short duration, small heat conduction and diffusion range and small material heating influence range. During machining, the tool electrode is not in contact with a workpiece material, and macroscopic acting force between the tool electrode and the workpiece material is extremely small. The tool electrode material need not be harder than the workpiece material. The method is widely applied to the processing of difficult-to-process materials in the aerospace field.
In the electric spark forming processing of difficult-to-process materials, especially for grid parts with a large number of holes, single electrodes are adopted to process the parts hole by hole at present, each part needs very long processing time, and uncontrollable repeated positioning errors are caused by repeated clamping for many times.
For thin-wall array group hole parts, as shown in fig. 1, since the wall thickness is only 0.3-0.5 mm, the grouped graphite electrodes cannot be directly milled by a numerical control milling machine, and the grouped graphite electrodes machined by using a wire-cut electric discharge machine have an electrode breakage phenomenon, as shown in fig. 2.
Disclosure of Invention
The invention aims to design a method for processing a thin-wall array group hole in a segmented manner aiming at the problems of low single-electrode hole-by-hole processing efficiency, poor repeated positioning precision and difficulty in processing grouped electrodes of a thin-wall array group hole part, so as to reduce the processing difficulty, improve the production efficiency, reduce the repeated positioning error and further improve the quality of the part.
In order to solve the technical problems, the invention adopts a technical scheme that:
a method for processing thin-wall array group holes comprises the following steps:
s1, grouping the hole sites of the array group holes, wherein the hole sites in each group are not adjacent to each other;
s2, making a group of electrodes corresponding to each group of hole sites;
s3, connecting and positioning the grouped electrodes with the main shaft of the electric spark forming machine tool;
s4, clamping and positioning the thin-wall array group hole parts to be processed to the positions corresponding to the group electrodes, and processing the corresponding grouped hole positions;
s5, adjusting the clamping and positioning positions of the thin-wall array group hole parts, and processing the next group of hole positions;
and S6, repeating the previous step until the array group hole machining is completed.
And step S3, connecting the grouped electrodes with the main shaft of the electric spark forming machine tool by using a reference conversion positioning sheet for positioning.
And the datum conversion positioning sheet is provided with a positioning groove.
In step S1, the hole sites of the array holes are divided into four groups.
In step S5, when the array group holes are different in size, the corresponding group electrodes are replaced.
The hole site blocks are partitioned according to the hole site conditions of actual parts, so that gaps between machined electrodes are increased, the problem that the electrodes cannot be machined due to the fact that the distance between the electrodes is too small is solved, and the problem that grouped graphite electrodes are difficult to machine is solved.
The number of electrodes of the grouped electrode processing part is determined according to the influence of the discharge state of the multi-cavity, the power supply capacity and the capacitance effect and the combination of the actual hole site condition of the workpiece and the blocking mode. After the blocking, the gap between the electrodes is increased, and the electrode can be formed by one-time milling of a numerical control milling machine, so that the processing is easy, and the precision is high.
The reference conversion positioning sheet connects the grouped electrodes with the main shaft of the electric spark forming machine tool, the positioning precision is high, and the repeated positioning error can be controlled within 2 mu m.
Compared with the prior art, the invention has the following beneficial effects:
1) the invention discloses a method for processing a thin-wall array group hole in a segmented manner, which can be applied to electric spark forming processing equipment, and particularly adopts a segmented processing mode for a part containing the thin-wall array group hole, so that the processing time of the group hole can be at least shortened to 1/5-1/10 compared with the processing time of a single hole by one hole, and the processing efficiency is improved.
2) The invention skillfully adopts a blocking method to divide hole positions into a plurality of staggered hole position structures, and then the staggered hole position structures are combined into a complete thin-wall array group hole part in a staggered way, so that the interpolar gaps of grouped electrodes are increased to be formed by one-time clamping and one-time milling processing by a numerical control milling machine, and the problem of difficult processing of graphite electrodes is solved.
3) The invention adopts the reference conversion positioning sheet to connect the electrode and the main shaft of the electric spark forming machine tool, effectively controls the repeated positioning error caused by replacing the electrode for many times, and improves the quality of parts.
4) The invention adopts a blocking mode, the number of electrodes of each block is determined by comprehensively considering the original hole position condition, the multi-cavity discharge state, the power supply capacity and the capacitance effect, and the invention is reasonable and efficient.
Drawings
FIG. 1 is a schematic diagram of hole sites of a thin-wall array group hole part.
Fig. 2 is a schematic diagram of the overall design of the electrode.
FIG. 3 is a schematic diagram of a hole site blocking method for a thin-wall array group hole part.
FIG. 4 is a schematic illustration of the first through fourth sets of holes;
FIG. 4a is a schematic view of a first set of hole locations;
FIG. 4b is a schematic view of a second set of hole locations;
FIG. 4c is a schematic view of a third set of hole locations;
FIG. 4d is a schematic view of a fourth set of holes.
Fig. 5 is a view showing a positioning manner of electrode processing.
Detailed Description
In the following, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, and other embodiments similar to this embodiment will be within the scope of the present invention.
Example 1
The invention relates to a method for processing thin-wall array group holes, which comprises the following steps:
s1, grouping the hole sites of the array group holes, wherein the hole sites in each group are not adjacent to each other;
s2, making a group of electrodes corresponding to each group of hole sites;
s3, connecting and positioning the grouped electrodes with the main shaft of the electric spark forming machine tool;
s4, clamping and positioning the thin-wall array group hole parts to be processed to the positions corresponding to the group electrodes, and processing the corresponding grouped hole positions;
s5, adjusting the clamping and positioning positions of the thin-wall array group hole parts, and processing the next group of hole positions;
and S6, repeating the previous step until the array group hole machining is completed.
In the invention, step S3 uses the reference conversion positioning sheet to connect and position the grouped electrodes with the main shaft of the electric spark forming machine tool. And the datum conversion positioning sheet is provided with a positioning groove.
Example 2
The invention relates to a method for processing thin-wall array group holes, which comprises the following steps:
s1, dividing the hole sites of the array group of holes into 4 groups, wherein the hole sites in each group are not adjacent to each other;
s2, making a group of electrodes corresponding to each group of hole sites;
s3, connecting and positioning the grouped electrodes with the main shaft of the electric spark forming machine tool;
s4, clamping and positioning the thin-wall array group hole parts to be processed to the positions corresponding to the group electrodes, and processing the corresponding grouped hole positions;
s5, adjusting the clamping and positioning positions of the thin-wall array group hole parts, and processing the next group of hole positions;
and S6, repeating the previous step until the array group hole machining is completed.
Example 3
The invention relates to a method for processing thin-wall array group holes, which comprises the following steps:
s1, dividing the hole sites of the array group holes into 4 groups, wherein the hole sites in each group are not adjacent to each other, and the sizes of the array group holes are different;
s2, making a group of electrodes corresponding to each group of hole sites;
s3, connecting and positioning the grouped electrodes with the main shaft of the electric spark forming machine tool;
s4, clamping and positioning the thin-wall array group hole parts to be processed to the positions corresponding to the group electrodes, and processing the corresponding grouped hole positions;
s5, replacing the corresponding grouped electrodes, adjusting the clamping and positioning positions of the thin-wall array group hole parts, and processing the next group of hole positions;
and S6, repeating the previous step until the array group hole machining is completed.
Example 4
The invention relates to a method for processing thin-wall array group holes, wherein a plurality of array square strips have gaps of only 0.3-0.5 mm, and the gaps correspond to the hole shapes of typical parts in a figure 1.
All the holes in the array on the part are divided into four parts for numbering, as shown in fig. 3, and the holes with the same number are processed by the same grouped electrodes, so that four identical independent grouped electrodes are obtained, as shown in fig. 4(a) to 4 (d).
The processing positioning mode is as shown in fig. 5, when processing grouped electrodes, the electrode 1 is connected with the reference conversion positioning plate 2, the reference conversion positioning plate 2 is connected with the blind rivet 4, the reference conversion positioning plate 2 is positioned with the numerical control milling machine workbench fixture through the positioning groove 3, the blind rivet 4 is fixedly tensioned in the numerical control milling machine workbench fixture, the processing is finished by one-time milling, and the relative position precision between processing electrode columns is ensured.
When an electric spark machine tool is used for processing thin-wall array holes, the electrode 1 is accurately positioned between the positioning groove 3 of the reference conversion positioning sheet 2 and the main shaft of the electric spark machine tool, and is fixed and tensioned on the main shaft of the electric spark machine tool through the blind rivet 4 to realize clamping. The processing of the electrode is the same as the positioning reference of the processing of the part, the reference transmission of the processing of the electrode and the processing of the part is realized, and the repeated positioning error can be controlled within 2 mu m. The hole site precision of part has been guaranteed.
The four block electrodes are replaced to respectively carry out electric spark machining on the workpiece, so that the integral rapid machining of the thin-wall array group holes can be realized.
Claims (5)
1. A method for processing thin-wall array group holes is characterized in that: the method comprises the following steps:
s1, grouping the hole sites of the array group holes, wherein the hole sites in each group are not adjacent to each other;
s2, making a group of electrodes corresponding to each group of hole sites;
s3, connecting and positioning the grouped electrodes with the main shaft of the electric spark forming machine tool;
s4, clamping and positioning the thin-wall array group hole parts to be processed to the positions corresponding to the group electrodes, and processing the corresponding grouped hole positions;
s5, adjusting the clamping and positioning positions of the thin-wall array group hole parts, and processing the next group of hole positions;
and S6, repeating the previous step until the array group hole machining is completed.
2. The method of claim 1, wherein the thin-walled array of holes is formed by: and step S3, connecting the grouped electrodes with the main shaft of the electric spark forming machine tool by using a reference conversion positioning sheet for positioning.
3. A method of machining a thin-walled array of holes as defined in claim 2, wherein: and the datum conversion positioning sheet is provided with a positioning groove.
4. The method of claim 1, wherein the thin-walled array of holes is formed by: in step S1, the hole sites of the array holes are divided into four groups.
5. The method of claim 1, wherein the thin-walled array of holes is formed by: in step S5, when the array group holes are different in size, the corresponding group electrodes are replaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811298182.XA CN111136358A (en) | 2018-11-02 | 2018-11-02 | Method for machining thin-wall array group holes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811298182.XA CN111136358A (en) | 2018-11-02 | 2018-11-02 | Method for machining thin-wall array group holes |
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| Publication Number | Publication Date |
|---|---|
| CN111136358A true CN111136358A (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811298182.XA Pending CN111136358A (en) | 2018-11-02 | 2018-11-02 | Method for machining thin-wall array group holes |
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| CN (1) | CN111136358A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894040A (en) * | 2021-01-26 | 2021-06-04 | 中国航发贵州黎阳航空动力有限公司 | Annular profile air film hole machining method |
| CN115780939A (en) * | 2023-02-01 | 2023-03-14 | 成都宝利根创科电子有限公司 | Electrode positioning sheet replacing device and method |
| CN116021100A (en) * | 2023-03-23 | 2023-04-28 | 成都宝利根创科电子有限公司 | Machining method for machining precision small boss type molded parts by electric spark |
| CN117102530A (en) * | 2023-09-14 | 2023-11-24 | 成都飞机工业（集团）有限责任公司 | A multi-spindle row drilling processing method for batch preparation of high-order group holes |
| CN117182215A (en) * | 2023-11-07 | 2023-12-08 | 成都宝利根创科电子有限公司 | Electrode assembly and processing method and using method thereof |
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| JP2002239844A (en) * | 2001-02-13 | 2002-08-28 | Denso Corp | Manufacturing method of die for molding honeycomb structure |
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| US20120174397A1 (en) * | 2010-12-15 | 2012-07-12 | Ngk Insulators, Ltd. | Manufacturing method of electrode for honeycomb structure forming die |
| US20120175349A1 (en) * | 2010-12-15 | 2012-07-12 | Ngk Insulators, Ltd. | Manufacturing method of electrode for honeycomb structure forming die |
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2018
- 2018-11-02 CN CN201811298182.XA patent/CN111136358A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| JPH08290330A (en) * | 1995-04-24 | 1996-11-05 | Toyota Motor Corp | EDM electrode |
| CN1274313A (en) * | 1997-10-17 | 2000-11-22 | 康宁股份有限公司 | Modified slot extrusion die |
| JP2002239844A (en) * | 2001-02-13 | 2002-08-28 | Denso Corp | Manufacturing method of die for molding honeycomb structure |
| CN1592674A (en) * | 2001-11-05 | 2005-03-09 | 日本碍子株式会社 | Honeycomb structural body forming ferrule, and method of manufacturing ferrule |
| US20120174397A1 (en) * | 2010-12-15 | 2012-07-12 | Ngk Insulators, Ltd. | Manufacturing method of electrode for honeycomb structure forming die |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894040A (en) * | 2021-01-26 | 2021-06-04 | 中国航发贵州黎阳航空动力有限公司 | Annular profile air film hole machining method |
| CN112894040B (en) * | 2021-01-26 | 2023-02-28 | 中国航发贵州黎阳航空动力有限公司 | Annular profile air film hole machining method |
| CN115780939A (en) * | 2023-02-01 | 2023-03-14 | 成都宝利根创科电子有限公司 | Electrode positioning sheet replacing device and method |
| CN115780939B (en) * | 2023-02-01 | 2023-04-18 | 成都宝利根创科电子有限公司 | Electrode positioning sheet replacing device and method |
| CN116021100A (en) * | 2023-03-23 | 2023-04-28 | 成都宝利根创科电子有限公司 | Machining method for machining precision small boss type molded parts by electric spark |
| CN117102530A (en) * | 2023-09-14 | 2023-11-24 | 成都飞机工业（集团）有限责任公司 | A multi-spindle row drilling processing method for batch preparation of high-order group holes |
| CN117102530B (en) * | 2023-09-14 | 2025-10-17 | 成都飞机工业（集团）有限责任公司 | Multi-spindle gang drill machining method for high-order group hole batch preparation |
| CN117182215A (en) * | 2023-11-07 | 2023-12-08 | 成都宝利根创科电子有限公司 | Electrode assembly and processing method and using method thereof |
| CN117182215B (en) * | 2023-11-07 | 2024-01-23 | 成都宝利根创科电子有限公司 | Electrode assembly and processing method and using method thereof |
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Application publication date: 20200512 |
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