GB2286355A - Wire-traction mechanism for elecroerosion machines - Google Patents
Wire-traction mechanism for elecroerosion machines Download PDFInfo
- Publication number
- GB2286355A GB2286355A GB9501918A GB9501918A GB2286355A GB 2286355 A GB2286355 A GB 2286355A GB 9501918 A GB9501918 A GB 9501918A GB 9501918 A GB9501918 A GB 9501918A GB 2286355 A GB2286355 A GB 2286355A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- wheel
- traction
- traction mechanism
- free
- 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.)
- Granted
Links
- 230000000694 effects Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 239000013013 elastic material Substances 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Electric Cable Installation (AREA)
Abstract
In electroerosion machines, the main wire-traction device is located in a lower head (4) arranged under the immediate area of the workpiece (5) and consists of a traction wheel (7), a first free wheel (81) and a second free wheel (82), each joined to a pivoting arm (131, 132), which arms are arranged 90 DEG apart with respect to the traction wheel (7), the first and second free wheels being pressed against the traction wheel under the effect of a first and a second spring (151, 152). Preferably the pressure on the second free wheel (82) is greater than on the first. A guide chute (16) is provided between the free wheels. <IMAGE>
Description
WIRE-TRACTION MECElANISM FOR ELECTROEROSION MACHINES
This invention relates to a wire-traction mechansim for electroerosion machines.
In wire electroerosion machines the wire typically is subject to numerous breaks, giving rise to technical and economic problems of maintenance, repair and amortization for machine downtime.
The applicant has observed that, to avoid undesirable vibrations which may increase breaking of the wire and defects in the piece to be machined, it is necessary. to place the lower head with the main traction device as close as possible to and preferably immediately below the piece to be machined.
The present invention procures a wire-traction mechanism for electroerosion machines, which is characterized in that it is located in a lower head placed under the immediate area of the piece to be machined and which consists of a traction wheel, a first free wheel and a second free wheel, each joined to a pivoting arm, which arms are arranged gO apart with respect to the traction wheel, the first and the second free wheels being pressed against the traction wheel under the effect of a first and a second spring.
At the same time, the electrical contact between the current tap and the wire is improved.
It is likewise characterized in that in the lower head there are located at least four terminals, in correspondence with the coaxial transmission cables of the pulsed electric current, each terminal being in electrical continuity with the body of the said lower head, on which there is provided frontally on one of its bases a tap of conducting material having a prismatic shape of polygonal section with convex faces, rotatable on its shaft and invertible, the wire being supported on an arc on one of its faces.
Figure 1 is a sectional view of a practical embodiment of the device, subject of the invention.
Figure 2 is a view of the device of Figure 1 together with the electroerosion machine.
The tap (6), preferably of tungsten carbide (Widia) has a prismatic shape with polygonal section and convex faces (18).
Contact between the conducting body (19) of the head (4) and the tap (6) is frontal, i.e., the base of the tap (6) against the body (19).
The wire (1) is not tangent to the contact face (18) but embraces it, so that the contact zone is not a point but is linear (contact arc), improving electrical contact.
To obtain the effect mentioned, the contact face (18) intersects the direction of the wire (1), which runs from upper guide (20) to the main drag zone.
The tap (6) is rotatable, so that each one of its faces is successively presented as contact face, and can be given a part-turn to present another base as contact with the body (19) and another zone of the face (18) for contact with the wire (1).
The wire (1) that comes from the upper head (not represented) passes through the workpiece (5) and reaches the lower head (4) arranged below in the vicinity of the said workpiece (5).
The wire (1), after passing through the corresponding cooling nozzle (3), comes into contact with the current tap (6).
To avoid peak intensity drops, the electric current is transmitted by five coaxial cables whose wires are connected to the piece (5) and terminals (17) of the lower head (4) and corresponding terminals of the upper head, which has its corresponding tap.
The wire (1) then enters the main drag zone, which consists of a drag wheel (7) and two free wheels (81), (82) arranged preferably 90' apart with respect to the drag wheel (7).
The drag wheel (7) preferably will be of ceramic material and receives its torque by means of a belt (9) driven by a motor (10).
The lower head (4) is joined to the bed (11) of the machine by means of an arm (12) carrying the transmission belt (9).
The free wheels (81), (82), by means of their arms (131), (132), pivot on the shaft (141), (142) against the action of the springs (151), (152) respectively, so that they press the wire (1) between them and the drag or traction wheel (7).
The surface of the first free wheel (81) preferably is of elastic material, the surface of the second free wheel (82) is of ceramic material and that of the drag wheel (7) is likewise ceramic, although they may be of other known materials.
It is provided that the force of the spring (152) on the second free wheel (82) is greater than that exerted by the respective spring (151) on the first free wheel (81), to prevent the wire (1) from separating from the traction wheel (7), thus improving conduction.
A guide chute (16) for the wire (1) is arranged between the two free wheels (81), (82).
Claims (7)
1. Wire-traction mechanism for electroerosion machines, characterized in that it is provided that the main wire-traction device is located in a lower head arranged below the immediate area of the piece to be machined and consists of a traction wheel, a first fEee wheel and a second free wheel, each joined to a pivoting arm, which arms are arranged 90' apart with respect to the traction wheel, the first and second free wheels being pressed against the traction wheel under the effect of a first and a second spring.
2. Wire-traction mechanism for electroerosion machines, according to the preceding claim, characterized in that the surface of the first free wheel is of elastic material.
3. Wire-traction mechanism for electroerosion machines, according to the first claim, characterized in that the second spring, which presses the second free wheel, exerts a greater pressure than the first spring on the first wheel.
4. Wire-traction mechanism for electroerosion machines, according to the first claim, characterized in that a guide chute for the wire is provided between the first and the second free wheel.
5. Wire-traction mechanism for electroerosion machines, according to the first claim, characterized in that in the lower head there are located at least four terminals, in correspondence with the coaxial transmission cables for the pulsed electric current, each terminal being in electrical continuity with the body of said lower head and on which there is arranged frontally on one of its bases a tap of conducting material having a prismatic shape of polygonal section with convex faces, rotatable on its shaft and invertible, the wire being supported on an arc on one of its faces.
6. Wire-traction mechanism for electroerosion machines, according to the first claim, characterized in that there is provided a motor which transmits its torque to the traction wheel by means carried by an arm joining the lower head to the machine structure.
7. Wire-traction mechanism for electroerosion machines substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES9400402 | 1994-02-15 | ||
| ES9400403 | 1994-02-15 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9501918D0 GB9501918D0 (en) | 1995-03-22 |
| GB2286355A true GB2286355A (en) | 1995-08-16 |
| GB2286355B GB2286355B (en) | 1996-06-19 |
Family
ID=26154773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9501918A Expired - Fee Related GB2286355B (en) | 1994-02-15 | 1995-02-01 | Wire-traction mechanism for electroerosion machines |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH690493A5 (en) |
| FR (1) | FR2716127B1 (en) |
| GB (1) | GB2286355B (en) |
| IT (1) | IT1275218B (en) |
| PT (1) | PT101657B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4698476A (en) * | 1982-05-06 | 1987-10-06 | Mitsubishi Denki Kabushiki Kaisha | Automatic wire feeder for an electrical discharge machining apparatus including combined cleaning fluid and working fluid supply systems |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62203722A (en) * | 1986-03-03 | 1987-09-08 | Inoue Japax Res Inc | Wire cut electric discharge machine |
| JPH0259220A (en) * | 1988-08-22 | 1990-02-28 | Mitsubishi Electric Corp | wire electrical discharge machining equipment |
| DE3991622T1 (en) * | 1989-04-27 | 1991-04-04 | Mitsubishi Electric Corp | ELECTROEROSIVE MACHINING PROCESS WORKING WITH WIRE CUT |
-
1995
- 1995-01-31 FR FR9501419A patent/FR2716127B1/en not_active Expired - Fee Related
- 1995-02-01 GB GB9501918A patent/GB2286355B/en not_active Expired - Fee Related
- 1995-02-07 IT ITMI950210A patent/IT1275218B/en active IP Right Grant
- 1995-02-10 CH CH00393/95A patent/CH690493A5/en not_active IP Right Cessation
- 1995-02-13 PT PT101657A patent/PT101657B/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4698476A (en) * | 1982-05-06 | 1987-10-06 | Mitsubishi Denki Kabushiki Kaisha | Automatic wire feeder for an electrical discharge machining apparatus including combined cleaning fluid and working fluid supply systems |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2716127B1 (en) | 1996-06-14 |
| PT101657B (en) | 1997-02-28 |
| FR2716127A1 (en) | 1995-08-18 |
| ITMI950210A1 (en) | 1995-08-15 |
| GB2286355B (en) | 1996-06-19 |
| CH690493A5 (en) | 2000-09-29 |
| GB9501918D0 (en) | 1995-03-22 |
| IT1275218B (en) | 1997-07-31 |
| ITMI950210A0 (en) | 1995-02-07 |
| PT101657A (en) | 1995-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010201 |