CN109249102A - Improve the tooling and method of electrical discharge machining process hole exits quality - Google Patents
Improve the tooling and method of electrical discharge machining process hole exits quality Download PDFInfo
- Publication number
- CN109249102A CN109249102A CN201811354970.6A CN201811354970A CN109249102A CN 109249102 A CN109249102 A CN 109249102A CN 201811354970 A CN201811354970 A CN 201811354970A CN 109249102 A CN109249102 A CN 109249102A
- Authority
- CN
- China
- Prior art keywords
- backing plate
- machining process
- discharge machining
- electrical discharge
- quality
- 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
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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
-
- 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
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
-
- 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
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
- B23H11/003—Mounting of workpieces, e.g. working-tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
- B23Q11/128—Arrangements for cooling or lubricating parts of the machine for cooling only for cooling frame parts
Abstract
The invention discloses a kind of toolings for improving electrical discharge machining process hole exits quality, including one piece of backing plate, the area of backing plate is greater than the exit region area of fabrication hole, thickness L >=Dcos α of backing plate, wherein, D is the diameter of fabrication hole, and α is the angle in face where technique axially bored line and technique hole exits, and backing plate uses conductive material；The method for improving electrical discharge machining process hole exits quality is also disclosed, backing plate is made according to the shapes and sizes of workpiece, backing plate and workpiece is fitted closely, then electrical discharge machining process hole, until stopping after backing plate is breakdown, backing plate is removed from workpiece；Before can ensure that backing plate is pierced, when carrying out electrical discharge machining process hole, after workpiece is pierced, since backing plate and workpiece fit closely, the kickback pressure of high pressure water in electrode tube does not reduce, still region of discharge can be cooled down and is washed away, to effectively improve the outgoing quality in electrical discharge machining process hole.
Description
Technical field
The invention belongs to small hole drilling by EDM fields, and in particular to a kind of improvement electrical discharge machining process hole exits quality
Tooling and method.
Background technique
Small hole drilling by EDM is that one kind using hollow tube-shaped electrode, using spark discharge ablation principle processing part adds
Work technique.When processing, high pressure de-ionized water is persistently sprayed from the hollow tube of hollow tube-shaped electrode, provides cooling for process
It is acted on chip removal.Small hole drilling by EDM process electrode meeting continued depletion, often will form in processing be manufactured into mouth slightly in this way
Greatly, slightly smaller taper hole is exported.When using small hole drilling by EDM through-hole, to reduce because of export license bring taper hole phenomenon,
Small hole drilling by EDM will continue to after penetrating workpiece feeding processing a distance, to non-consumed electrodes position to taper hole
It is modified.However, being greater than 2.5mm, simultaneous processing axially bored line and machined surface method wire clamp when the aperture of small hole drilling by EDM
When angle is greater than 70 °, by after partial breakdown, processing feed speed can significantly reduce workpiece, " rollback-feeding-time occur
Move back " such phenomenon repeatedly, cause single hole process time to obviously increase, simultaneously because the unilateral recoil effect of high pressure water, is caused small
The quality problems that " local misrun " is generated at hole exits, as shown in Fig. 1~2.
Summary of the invention
In order to solve problems of the prior art, the present invention provides a kind of improvement electrical discharge machining process hole exits
The tooling and method of quality are arranged one piece of backing plate in fabrication hole exit surface, fit closely backing plate with workpiece, due to backing plate
The recoil strength of high pressure water continues to carry out uniformly cooling to entire outlet region of discharge and wash away after effect work piece penetration, solves existing
There is the problem of technology.
To achieve the goals above, the technical solution adopted by the present invention is that, improve electrical discharge machining process hole exits quality
Tooling, including one piece of backing plate, the area of backing plate is greater than the exit region area of fabrication hole, thickness L >=Dcos α of backing plate,
Wherein, D is the diameter of fabrication hole, and α is the angle in face where technique axially bored line and technique hole exits, and backing plate uses conductive material.
Backing plate is made of 45 steel.
Flatness and roughness of the flatness and roughness of backing plate no more than plane where technique hole exits.
Backing plate side, which is provided with, to be used for and the close-connected clamping device of workpiece.
In backing plate side, one stack clamping device is at least set.
The hardness of backing plate is lower than the hardness of institute's workpieces processing.
Improve the method for electrical discharge machining process hole exits quality, comprising the following steps:
Step 1, backing plate is made；
Step 2, clamping backing plate fits closely plane where backing plate and technique hole exits on workpiece, and by backing plate with
Workpiece clamping；
Step 3, electrical discharge machining process hole, until stopping after backing plate is breakdown；
Step 4, fabrication hole after processing is completed, removes backing plate from workpiece.
In step 1, backing plate is made using 45 steel.
In step 1, the flatness and roughness of plane where the flatness and roughness of backing plate are not more than technique hole exits.
Used backing plate region be not repeated using.
Compared with prior art, the present invention at least has the advantages that the area of backing plate is greater than the outlet of fabrication hole
Region area, plate thickness L >=Dcos α, wherein D is the diameter of fabrication hole, and α is technique axially bored line and technique hole exits institute
Angle in face, before can ensure that backing plate is pierced, technique hole exits are constantly in cooled and scouring state, and backing plate is using conductive
Material；When carrying out electrical discharge machining process hole, after workpiece is pierced, since backing plate and workpiece fit closely, in electrode tube
The kickback pressure of high pressure water do not reduce, still region of discharge can be cooled down and be washed away, to effectively improve electricity
The outgoing quality in spark processes hole；
It is greater than 2.5mm carrying out small hole drilling by EDM diameter, aperture axis and machined surface normal angle are greater than 70 ° of hole
When, after workpiece is by partial breakdown, what the high pressure water in electrode tube still can not continue equably entirely exports aperture
Region is cooled down, and guarantees the consistency of small hole exits, " local misrun " matter caused by eliminating because of the unilateral recoil effect of high pressure water
Amount problem, while the outlet dead time of small hole machined is reduced, improve machining small processing efficiency.
Further, 45 steel energy is conductive and EDM Performance is excellent, at low cost.
Further, flatness and roughness of the flatness and roughness of backing plate no more than plane where technique hole exits
Be conducive to backing plate and workpiece fits closely.
Further, backing plate side be provided with for and the close-connected clamping device of workpiece, be bonded backing plate with workpiece
It is relatively reliable, improve the stability and reliability of process.
Further, the hardness of backing plate is lower than the hardness of institute's workpieces processing, can effectively avoid work of surprisingly damaging in clamping
Part.
Further, used backing plate region is not repeated using and other do not make using another piece of backing plate or backing plate
Region can ensure that in work piece penetration, spark discharge concentration zones are constantly in and wash away and the state of cooling.
Detailed description of the invention
Fig. 1 is electric discharge and scouring state schematic diagram before electrical discharge machining process hole penetrates.
Fig. 2 exports out the local misrun phenomenon schematic diagram of generation.
Fig. 3 is plate thickness and fabrication hole aperture and axially bored line angle schematic diagram.
In attached drawing: 1- backing plate, 2- workpiece, 3- electrode tube.
Specific embodiment
Below with reference to example, the present invention will be described in detail, but protection scope of the present invention is not only limited to following implementations
Example:
As shown in figure 3, improving the tooling of electrical discharge machining process hole exits quality, including one piece of backing plate 1, the face of backing plate 1
Product is greater than the exit region area of fabrication hole, thickness L >=Dcos α of backing plate 1, wherein D is the diameter of fabrication hole, and α is technique
The angle in face where axially bored line and technique hole exits, backing plate 1 use conductive material；Backing plate is made of 45 steel；The plane of backing plate 1
The flatness and roughness of plane where degree and roughness are not more than technique hole exits；
Backing plate side, which is provided with, to be used for and the close-connected clamping device of workpiece；In backing plate side, one group of clamping is at least set
Device；The hardness of backing plate 1 is lower than the hardness of institute's workpieces processing；Clamping device is C-shaped fixture, and one end of C-shaped fixture is provided with tightly
Fixing bolt.
Clamping device is the annular lock ring of opening in another alternative embodiment of the invention, and the both ends of lock ring pass through clamping lock
Clamping；In addition metal binding belt also can be selected in clamping device of the present invention.
Improve the method for electrical discharge machining process hole exits quality, comprising the following steps:
Step 1, backing plate 1 is made；Backing plate 1 is made using 45 steel；The flatness and roughness of backing plate 1 go out no more than fabrication hole
The flatness and roughness of plane where mouthful.
Step 2, clamping backing plate 1 fits closely plane where backing plate 1 and technique hole exits on workpiece 2, and by backing plate
1 clamps with workpiece 2；
Step 3, electrical discharge machining process hole, until stopping after backing plate is breakdown；
Step 4, fabrication hole after processing is completed, removes backing plate 1 from workpiece 2；Used backing plate region is not repeated to make
With.
Tooling of the present invention and method are used for the processing of following part, certain annular workpieces need to process 36 on end face
The fabrication hole of circumference array, wherein aperture d is Φ 3.0mm, and angle α is 15 °, be the steps include:
Step 1, make backing plate 1: the shape of backing plate 1 is annular, annular diameters≤Φ 570mm, outer annular diameter >=Φ
580mm；Backing plate requires production according to following:
A, plate thickness: the small aperture processed is D=3.0mm, the angle of aperture axis and pelvic outlet plane be α=
15 °, then the thickness L of backing plate should meet: L >=Dcos α, i.e. L >=2.89mm；
B, backing material is 45 steel；
C, flatness≤0.05 of backing plate, roughness≤Ra0.8.
Step 2, backing plate 1 is fitted closely and is clamped with plane where the fabrication hole hole exits on workpiece 2.
Step 3, electrical discharge machining process hole is carried out, until stopping after backing plate is breakdown.
Step 4, dismantle backing plate: fabrication hole after processing is completed, removes backing plate 1, the backing plate region used from workpiece 2
Not reproducible use.
It is greater than 2.5mm carrying out small hole drilling by EDM diameter, aperture axis and machined surface normal angle are greater than 70 ° of hole
When, after workpiece is by partial breakdown, what the high pressure water in electrode tube 3 still can not continue equably entirely exports aperture
Region is cooled down, and guarantees the consistency of small hole exits, " local misrun " matter caused by eliminating because of the unilateral recoil effect of high pressure water
Amount problem, while the outlet dead time of small hole machined is reduced, improve machining small processing efficiency.
Claims (10)
1. improving the tooling of electrical discharge machining process hole exits quality, which is characterized in that including one piece of backing plate (1), backing plate (1)
Area is greater than the exit region area of fabrication hole, thickness L >=Dcos α of backing plate (1), wherein D is the diameter of fabrication hole, and α is
The angle in face where technique axially bored line and technique hole exits, backing plate (1) use conductive material.
2. the tooling according to claim 1 for improving electrical discharge machining process hole exits quality, which is characterized in that backing plate
(1) it is made of 45 steel.
3. the tooling according to claim 1 for improving electrical discharge machining process hole exits quality, which is characterized in that backing plate
(1) flatness and roughness of the flatness and roughness no more than plane where technique hole exits.
4. the tooling according to claim 1 for improving electrical discharge machining process hole exits quality, which is characterized in that backing plate
(1) side, which is provided with, is used for and workpiece (2) close-connected clamping device.
5. the tooling according to claim 1 for improving electrical discharge machining process hole exits quality, which is characterized in that in backing plate
A stack clamping device is at least arranged in side.
6. the tooling according to claim 1 for improving electrical discharge machining process hole exits quality, which is characterized in that backing plate
(1) hardness is lower than the hardness of institute's workpieces processing.
7. improving the method for electrical discharge machining process hole exits quality using tooling described in claim 1, which is characterized in that including
Following steps:
Step 1, backing plate (1) is made；
Step 2, clamping backing plate (1) fits closely backing plate (1) and plane where the technique hole exits on workpiece (2), and will pad
Plate (1) and workpiece (2) clamp；
Step 3, electrical discharge machining process hole, until stopping after backing plate (1) is breakdown；
Step 4, fabrication hole after processing is completed, removes backing plate (1) from workpiece (2).
8. the method according to claim 7 for improving electrical discharge machining process hole exits quality, which is characterized in that step 1
In, backing plate (1) is made using 45 steel.
9. the method according to claim 7 for improving electrical discharge machining process hole exits quality, which is characterized in that step 1
In, the flatness and roughness of plane where the flatness and roughness of backing plate (1) are not more than technique hole exits.
10. the method according to claim 7 for improving electrical discharge machining process hole exits quality, which is characterized in that use
The backing plate region crossed be not repeated using.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811354970.6A CN109249102A (en) | 2018-11-14 | 2018-11-14 | Improve the tooling and method of electrical discharge machining process hole exits quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811354970.6A CN109249102A (en) | 2018-11-14 | 2018-11-14 | Improve the tooling and method of electrical discharge machining process hole exits quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109249102A true CN109249102A (en) | 2019-01-22 |
Family
ID=65044698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811354970.6A Pending CN109249102A (en) | 2018-11-14 | 2018-11-14 | Improve the tooling and method of electrical discharge machining process hole exits quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109249102A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112475490A (en) * | 2020-11-12 | 2021-03-12 | 中国航发沈阳黎明航空发动机有限责任公司 | Wall-to-wall protection method for gas film hole at seam groove part of flame tube in electric spark machining |
Citations (4)
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|---|---|---|---|---|
| US20030173337A1 (en) * | 2002-03-14 | 2003-09-18 | Tetsuro Ito | Electric sparking drill and method for forming a hole with an electric spark |
| CN101524778A (en) * | 2009-03-10 | 2009-09-09 | 南京航空航天大学 | Slotted electrolytic machining method and slotted tool |
| CN102601470A (en) * | 2012-03-21 | 2012-07-25 | 南京航空航天大学 | Method for improving stability of electrolytic machining process of tube electrode |
| CN104801801A (en) * | 2015-04-30 | 2015-07-29 | 南京航空航天大学 | Freezing-assisted micro-hole processing method and freezing-assisted micro-hole processing device based on low-temperature environment |
-
2018
- 2018-11-14 CN CN201811354970.6A patent/CN109249102A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030173337A1 (en) * | 2002-03-14 | 2003-09-18 | Tetsuro Ito | Electric sparking drill and method for forming a hole with an electric spark |
| CN101524778A (en) * | 2009-03-10 | 2009-09-09 | 南京航空航天大学 | Slotted electrolytic machining method and slotted tool |
| CN102601470A (en) * | 2012-03-21 | 2012-07-25 | 南京航空航天大学 | Method for improving stability of electrolytic machining process of tube electrode |
| CN104801801A (en) * | 2015-04-30 | 2015-07-29 | 南京航空航天大学 | Freezing-assisted micro-hole processing method and freezing-assisted micro-hole processing device based on low-temperature environment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112475490A (en) * | 2020-11-12 | 2021-03-12 | 中国航发沈阳黎明航空发动机有限责任公司 | Wall-to-wall protection method for gas film hole at seam groove part of flame tube in electric spark machining |
| CN112475490B (en) * | 2020-11-12 | 2022-08-19 | 中国航发沈阳黎明航空发动机有限责任公司 | Wall-to-wall protection method for air film hole at seam groove part of flame tube in electric spark machining |
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| 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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190122 |