APPARATUS AND METHOD FOR CUTTING SEMI/NON-CONDUCTOR USING WEDM

• US 20160121415A1
• Filed: 07/07/2015
• Published: 05/05/2016
• Est. Priority Date: 11/05/2014
• Status: Abandoned Application

• Current Assignee: National Taiwan University of Science and Technology
• Original Assignee: National Taiwan University of Science and Technology
• Inventors: Kuo, Chun-Liang, Jeng, Jeng-Ywan
• Application Number:
  US14/792,786
• Publication Number:
  US 20160121415A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23H 11/00 Auxiliary apparatus or details, not otherwise provided for
• CPC Class Codes: B23H 7/02 Wire-cutting
• CPC Class Codes: B23H 7/04 Apparatus for supplying current to working gap; Electric circuits specially adapted therefor

Abstract

A wire electrical discharge machining (WEDM) method is disclosed, the WEDM method comprising steps of: (a) providing one of a non-conductive and a weakly conductive object having a to-be-cut surface; (b) providing one of a wire and a cutting tool having a cutting blade edge to cut the object along the to-be-cut surface; (c) providing a conductive medium to adhere to the to-be-cut surface via the cutting blade edge; and (d) applying an electric current between the one of the wire and the cutting tool, and the to-be-cut surface adhered to the conductive medium such that the to-be-cut surface is melted.

Claims

1. A wire electrical discharge machining (WEDM) method, the WEDM method comprising steps of:

(a) providing one of a non-conductive and a weakly conductive objects having a to-he-cut surface;

(b) providing one of a wire and a cutting tool having a cutting blade edge to cut the object along the to-be-cut surface;

(c) providing a conductive medium to be adhered to the to-be-cut surface via the cutting blade edge; and

(d) applying an electric current between the one of the wire and the cutting tool, and the to-be-cut surface adhered with the conductive medium such that the to-be-cut surface is melted.

2. The WEDM method as claimed in claim 1, further comprising steps:

repeating steps (c)-(d).

3. The WEDM method as claimed in claim 2, wherein the step (e) further comprises a step of spraying a cutting fluid to remove an oxide slag generated when the electric current is applied.

4. The WEDM method as claimed in claim 1, wherein the object has a surface adjacent to the to-be-cut surface, and the step (c) further comprises:

(c1) providing a conductive medium source, wherein the conductive medium source is a metal piece configured on the surface.

5. The WEDM method as claimed in claim 4, wherein the conductive medium is a metal slag, and the step (c) further comprises:

(c2) moving the one of the wire and the cutting tool close to an edge of the metal piece and the to-be-cut surface in a first direction, applying a voltage between the metal piece and the one of the wire and the cutting tool such that the metal piece is melted to release the metal slag on the one of the wire and the cutting tool to be adhered to the to-be-cut surface; and

(c3) after the one of the wire and the cutting tool touches the edge of the metal piece and the to-be-cut surface, moving the one of the wire and the cutting tool in a second direction away from the edge of the metal piece and the to-be-cut surface.

6. The WEDM method as claimed in claim 5, wherein the one of the wire and the cutting tool includes a wire conductor, a first axis and a second axis parallel to the first axis, wherein the wire conductor is annularly configured around the first axis and the second axis, and the step (c2) comprises:

(c21) rotating one of the first axis and the second axis to drive the wire conductor such that the metal slag adhered to the wire conductor eventually adheres to the to-be-cut surface.

7. The WEDM method as claimed in claim 4, wherein the step (d) further comprises:

(d1) moving the one of the wire and the cutting tool close to an edge of the metal piece and the to-be-cut surface in a first direction, applying the electric current until the one of the wire and the cutting tool touches the edge of the metal piece and the to-be-cut surface; and

(d2) moving the one of the wire and the cutting tool in a second direction away from the edge of the metal piece and the to-be-cut surface.

8. The WEDM method as claimed in claim 1, wherein the conductive medium in the step (c) further permeates into the to-be-cut surface.

9. A wire electrical discharge machining (WEDM) apparatus for applying the WEDM on one of a non-conductive and a weakly conductive objects, wherein the one object has a to-be-cut surface, comprising:

one of a wire and a cutting tool having a cutting blade to cut the object along the to-be-cut surface;

a conductive medium source providing a conductive medium to be adhered to the to-be-cut surface via the cutting blade; and

an electric current source for applying an electric current between the one of the wire and the cutting tool and the to-be-cut surface adhered with the conductive medium such that the to-be-cut surface is melted.

10. The WEDM apparatus as claimed in claim 9, wherein the object has an upper surface adjacent to the to-be-cut surface, the conductive medium source is a metal piece configured on the upper surface, and the conductive medium is a metal slag.

11. The WEDM apparatus as claimed in claim 10, wherein a voltage is applied between the one of the wire and the cutting tool and the metal piece such that the metal piece is melted, the metal slag is released, and the metal slag eventually adheres to the one of the wire and the cutting tool.

12. The WEDM apparatus as claimed in claim 11, wherein the one of the wire and the cutting tool includes a wire conductor, a first axis and a second axis parallel to the first axis, the wire conductor is annularly configured around the first axis and the second axis, and one of the first axis and the second axis is rotated to drive the wire conductor such that the metal slag adhered on the wire conductor adheres to the to-be-cut surface.

13. The WEDM apparatus as claimed in claim 9, further comprising a conductive fixture, wherein the electric current source includes a first electrode and a second electrode, the conductive fixture is configured to fix the conductive medium source and the object, the first electrode is electrically connected to the conductive medium source, and the second electrode is electrically connected to the one of the wire and the cutting tool.

14. A wire electrical discharge machining (WEDM) apparatus for applying the WEDM on one of a non-conductive and a weakly conductive objects, wherein the one object has a to-he-cut surface, comprising:

one of a wire and a cutting tool having a cutting blade to cut the object along the to-be-cut surface; and

a conductive medium source providing a conductive medium to be adhered to the to-be-cut surface via the cutting blade, wherein the to-be-cut surface is melted by an application of an electric current between the one of the wire and the cutting tool and the to-be-cut surface adhered with the conductive medium.

15. The WEDM apparatus as claimed in claim 14, further comprising an electric current source for applying the electric current.

16. The WEDM apparatus as claimed in claim 15, wherein the object has an upper surface adjacent to the to-be-cut surface, the conductive medium source is a metal piece configured on the upper surface, and the conductive medium is a metal slag.

17. The WEDM apparatus as claimed in claim 16, wherein a voltage is applied between the one of the wire and the cutting tool and the metal piece such that the metal piece is melted, the metal slag is then generated, and the metal slag adheres to the one of the wire and the cutting tool.

18. The WEDM apparatus as claimed in claim 17, wherein the one of the wire and the cutting tool includes a wire conductor, a first axis and a second axis parallel to the first axis, the wire conductor is annularly configured around the first axis and the second axis, and one of the first axis and the second axis is rotated to drive the wire conductor such that the metal slag adhered to the wire conductor adheres to the to-be-cut surface.

19. The WEDM apparatus as claimed in claim 14, further comprising a conductive fixture, wherein the electric current source includes a first electrode and a second electrode, the conductive fixture is configured to fix the conductive medium source and the object, the first electrode is electrically connected to the conductive medium source, and the second electrode is electrically connected to the one of the wire and the cutting tool.

20. The WEDM apparatus as claimed in claim 14, wherein the conductive medium further permeates into the to-be-cut surface.