GB2452496A - EDM machine attachment and method for machining winkle or tunnel gates in injection mould tools - Google Patents
EDM machine attachment and method for machining winkle or tunnel gates in injection mould tools Download PDFInfo
- Publication number
- GB2452496A GB2452496A GB0717206A GB0717206A GB2452496A GB 2452496 A GB2452496 A GB 2452496A GB 0717206 A GB0717206 A GB 0717206A GB 0717206 A GB0717206 A GB 0717206A GB 2452496 A GB2452496 A GB 2452496A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- electrical discharge
- discharge machining
- path
- attachment according
- 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.)
- Withdrawn
Links
- 238000002347 injection Methods 0.000 title claims abstract description 6
- 239000007924 injection Substances 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title description 8
- 238000003754 machining Methods 0.000 title description 3
- 238000009760 electrical discharge machining Methods 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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
- B23H9/006—Cavity sinking
-
- 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
- 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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
-
- 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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
- B23H7/30—Moving electrode in the feed direction
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
This is an attachment that rotates a spark eroding electrode 4, in a circular path. The attachment is electrically insulated from the machine head 2, 6, and 7, and may be driven through a rack and pinion or other gearing or friction means. The attachment may be used to machine gates in injection moulds.
Description
DESCRIPTION
EDM Machine Attachment and Method for Machining Winkle or Tunnel Gates in Injection Mould Tools Injection mould makers and designers are often faced with the problem of producing a mould with the minimum of gate witness on products that are of aesthetic design, this is often done by using winkle or tunnel gates, these are usually bought in components that are inserted into the mould, and by the very act of using an insert they leave a witness mark where the gate has been inserted. This method spark erodes the gate in the solid leaving no insert marks and is also a great cost saving.
Fig. 1. shows a typical layout of a winkle gate the electrode is I and 5,the runner is 2 and 6,the ejector pin is 3 and 7,the mould cavity is 4 and 8.
1,2,3,4 show the electrode in the start position 5,6,7,8 shows the electrode in the fmished position after machining the gate.
The prototype attachment is shown in Fig.2, an electrically conductive rack I is attached to the head of the spark eroding machine driving an electrically insulated pinion 2 that rotates an electrically conductive electrode carrier 3 that is adjustable in both directions so that the electrode 4 can be centred about the pinion spindle, also the electrode carrier 3 is able to be rotated independently of the spindle and locked in position, this enables the rack 1 to be set to the top of the stroke and the electrode start position to be set. The bearing block 6 is made of electrically insulated material with provision for the rack I to be moved to the other side so that the electrode 4 can be rotated in an anti-clockwise direction.The electrode holder 5 is a shaft of any length to reach the required spark erosion position, that holds the electrode 4, in the prototype it was soldered but can be screwed, clamped or fixed by any other means. The attachment holder 7 is adjustable in both directions to assist in correct positioning of the electrode; this could be a graduated machine slide, or a machine slide with a D.R.O.or as in the prototype positioned by either slip gauges or a depth micrometer. It could be fixed to the mould by screwing to the top or side or clamping in position, or fixed magnetically.
Page 1
Description Page2
Referring to Fig.4 which is a section through the attachment, I is a spring loaded carbon brush that conducts the E.D.M. current from the head through the rack 2 to the electrode and also provides the feedback to control the downward progress of the head, the pinion is 3 the bearing block is 4 and the adjustable electrode carrier is 5. Another method of transferring the current would be to have both an electrically insulated rack and pinion and have the current and feedback transferred by a wire as shown in fig.3. Fig.5 shows another method of moving the electrode by friction; another way would be to have a gear cut into either the inside or outside profile of the electrode, and the pinion driving the electrode directly To use the attachment it is firstly attached and positioned on to the mould that is having the gate cut into it, the rack is then taken to the top start position with the electrode free to rotate on the pinion spindle the electrode is then positioned correctly to where the gate is to be cut and locked,as the head of the machine descends the point of the electrode rotates and comes into contact with the job and starts eroding in a circular path cutting the required gate, as soon as the electrode makes contact feedback is sent to the servo motor of the E.D.M. machine thereby controlling the progress of the electrode into the job.
The electrodes used in this process can be made of any suitable spark eroding material i.e. copper, tungsten copper, graphite etc., they can be of any cross sectional shape i.e. Circular, elliptical, square, rectangular or of any combination of changing shapes within their length, they can be of any suitable size and can be produced by any method i.e. Milling, pressing, casting, spark erosion, wire eroding etc. This attachment and method can be used on any injection mould where the gate witness is to be as small as possible or thin mouldings where the wall is not deep enough to take a sub gate, or the inside of a vertical wall or in fact anywhere that the moulding needs to be automatically de-gated, also as these bought in components are very expensive there would be a huge cost saving.
Claims (10)
1. An Electrical Discharge Machining attachment for spark eroding winkle or tunnel gates in the solid, or in inserts, in injection moulds by moving the electrode in a circular or non circular path, the path of the electrode being controlled by feedback from the electrode to the machine head.
2. An Electrical Discharge Machining attachment according to claim 1, in which the electrode is rotated by rack and pinion gearing in a circular path.
3. An Electrical Discharge Machining attachment according to claim 1, in which the electrode is rotated by frictional means in a circular path.
4. An Electrical Discharge Machining attachment according to claim 1, that is rotated by a gear either cut internally or externally on the electrode itself in a circular path.
5. An Electrical Discharge Machining attachment according to claim 1 that provides means of adjustment to position the electrode to the correct place.
6. An Electrical Discharge Machining attachment according to claim 1, that provides means of adjustment to the electrode independently of the position of the attachment.
7. An Electrical Discharge Machining attachment according to claim 1, where the electrode path is controlled in a circular or non circular path by Computerised Numerical Control.
8. An Electrical Discharge Machining attachment according to claim 1, where the electrode path is controlled in a circular or non circular path by cams.
9. An Electrical Discharge Machining attachment according to claim 1, where the electrode path is controlled in a circular or non circular path by a pantograph motion.
Claims
I O.A complete Electrical Discharge Machine according to any or all of the previous claims dedicated to spark eroding Winkle or Tunnel Gates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0717206A GB2452496A (en) | 2007-09-05 | 2007-09-05 | EDM machine attachment and method for machining winkle or tunnel gates in injection mould tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0717206A GB2452496A (en) | 2007-09-05 | 2007-09-05 | EDM machine attachment and method for machining winkle or tunnel gates in injection mould tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0717206D0 GB0717206D0 (en) | 2007-10-17 |
| GB2452496A true GB2452496A (en) | 2009-03-11 |
Family
ID=38640226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0717206A Withdrawn GB2452496A (en) | 2007-09-05 | 2007-09-05 | EDM machine attachment and method for machining winkle or tunnel gates in injection mould tools |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2452496A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103878461A (en) * | 2014-03-24 | 2014-06-25 | 歌尔声学股份有限公司 | Discharging jig for machining horn gate |
| CN107498123A (en) * | 2017-08-18 | 2017-12-22 | 苏州沃思诺自动化科技有限公司 | A kind of monoblock type ox horn glue mouth electrode and its design method |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB848736A (en) * | 1958-06-14 | 1960-09-21 | Hans Deckel | An improved machine for producing moulds, dies and the like |
| GB895357A (en) * | 1959-09-29 | 1962-05-02 | Harold Stuart Hallewell | Method and apparatus for forming by spark erosion a predetermined profile on a workpiece |
| GB1451135A (en) * | 1973-05-29 | 1976-09-29 | Andrew Eng Co | Wire electrode electro erosion apparatus |
| GB1560472A (en) * | 1977-04-25 | 1980-02-06 | Inoue Japax Res | Electroerosion |
| GB2033608A (en) * | 1978-11-01 | 1980-05-21 | Elmapa Nv | Cutting by a wire electrode |
| GB2062294A (en) * | 1979-10-03 | 1981-05-20 | Inoue Japax Res | Controlling a movable element in a machine tool |
| CH639886A5 (en) * | 1980-12-30 | 1983-12-15 | Charmilles Sa Ateliers | Method for machining using erosive discharges |
| JPS608055A (en) * | 1983-06-28 | 1985-01-16 | 住友電気工業株式会社 | Manufacture of electromagnetic shielding body |
| EP0144122A1 (en) * | 1983-09-02 | 1985-06-12 | Inoue Japax Research Incorporated | Feed-deviation preventive path-controlled machining method and apparatus |
| SU1283000A1 (en) * | 1983-09-26 | 1987-01-15 | Предприятие П/Я Г-4665 | Electro-erosion working machine |
| US5030819A (en) * | 1988-03-29 | 1991-07-09 | Claudio Borsari | Method and device for numerical control for electroerosion machine |
| EP0446368A1 (en) * | 1989-10-04 | 1991-09-18 | Fanuc Ltd. | Machining condition setting method for wire cut discharge machine |
| US5218548A (en) * | 1988-10-07 | 1993-06-08 | Mitsubishi Denki K.K. | Method for displaying a figure on a cathode ray tube of a numerical control system |
| US5243167A (en) * | 1992-09-16 | 1993-09-07 | Ingemar H. Lundquist | Apparatus and method for manufacturing a slotted torque tube |
| US6028281A (en) * | 1996-10-04 | 2000-02-22 | Sodick Co., Ltd. | Wire cut electric discharge method and apparatus |
-
2007
- 2007-09-05 GB GB0717206A patent/GB2452496A/en not_active Withdrawn
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB848736A (en) * | 1958-06-14 | 1960-09-21 | Hans Deckel | An improved machine for producing moulds, dies and the like |
| GB895357A (en) * | 1959-09-29 | 1962-05-02 | Harold Stuart Hallewell | Method and apparatus for forming by spark erosion a predetermined profile on a workpiece |
| GB1451135A (en) * | 1973-05-29 | 1976-09-29 | Andrew Eng Co | Wire electrode electro erosion apparatus |
| GB1560472A (en) * | 1977-04-25 | 1980-02-06 | Inoue Japax Res | Electroerosion |
| GB2033608A (en) * | 1978-11-01 | 1980-05-21 | Elmapa Nv | Cutting by a wire electrode |
| GB2062294A (en) * | 1979-10-03 | 1981-05-20 | Inoue Japax Res | Controlling a movable element in a machine tool |
| CH639886A5 (en) * | 1980-12-30 | 1983-12-15 | Charmilles Sa Ateliers | Method for machining using erosive discharges |
| JPS608055A (en) * | 1983-06-28 | 1985-01-16 | 住友電気工業株式会社 | Manufacture of electromagnetic shielding body |
| EP0144122A1 (en) * | 1983-09-02 | 1985-06-12 | Inoue Japax Research Incorporated | Feed-deviation preventive path-controlled machining method and apparatus |
| SU1283000A1 (en) * | 1983-09-26 | 1987-01-15 | Предприятие П/Я Г-4665 | Electro-erosion working machine |
| US5030819A (en) * | 1988-03-29 | 1991-07-09 | Claudio Borsari | Method and device for numerical control for electroerosion machine |
| US5218548A (en) * | 1988-10-07 | 1993-06-08 | Mitsubishi Denki K.K. | Method for displaying a figure on a cathode ray tube of a numerical control system |
| EP0446368A1 (en) * | 1989-10-04 | 1991-09-18 | Fanuc Ltd. | Machining condition setting method for wire cut discharge machine |
| US5243167A (en) * | 1992-09-16 | 1993-09-07 | Ingemar H. Lundquist | Apparatus and method for manufacturing a slotted torque tube |
| US6028281A (en) * | 1996-10-04 | 2000-02-22 | Sodick Co., Ltd. | Wire cut electric discharge method and apparatus |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103878461A (en) * | 2014-03-24 | 2014-06-25 | 歌尔声学股份有限公司 | Discharging jig for machining horn gate |
| CN103878461B (en) * | 2014-03-24 | 2015-12-30 | 歌尔声学股份有限公司 | Processing cow glue powder discharge fixture |
| CN107498123A (en) * | 2017-08-18 | 2017-12-22 | 苏州沃思诺自动化科技有限公司 | A kind of monoblock type ox horn glue mouth electrode and its design method |
| CN107498123B (en) * | 2017-08-18 | 2019-08-23 | 苏州沃思诺自动化科技有限公司 | A kind of design method of monoblock type ox horn glue mouth electrode |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0717206D0 (en) | 2007-10-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |