Electric heating – Metal heating – Cutting or disintegrating
Patent
1983-10-05
1986-09-23
Albritton, C. L.
Electric heating
Metal heating
Cutting or disintegrating
76107A, 204206, B23P 108
Patent
active
046137408
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to guide holders of an electrodischarge machining (EDM) apparatus having a wire electrode. As illustrated in FIG. 1, an EDM apparatus is so designed that workpiece (5) is cut or electroeroded by means of an electric potential-applied wire electrode (3), which is moved through the guide members (2)(2) disposed in the guide holders, e.g. the metallic holders (1)(1).
In particular, this invention relates to a guide holder of an EDM apparatus, wherein a diamond body, which is considered to be the hardest solid material, is employed in the guide member for the purpose of minimizing the wear and the deformation of the wall of the wire electrode-guiding hole of the guide member due to the friction between the guide member and the wire electrode passing through the guide member. Furthermore, the guide holder according to the invention is so designed that it is easy to conduct an operation of inserting the wire electrode into the hole of the guide member. In addition, the guide holder is sufficiently resistant to any electroerosion.
BACKGROUND OF THE INVENTION
As illustrated in FIG. 2, a known guide holder device comprises a metallic holder (1), into which a diamond guide member (2) is inserted. The guide member (2) has a cylindrical hole (4), through which a wire electrode (3) is passed. As the wire electrode (3) is very fine and the hole (4) has a very small diameter of at most 0.2 mm, it is a difficult and time-consuming operation to insert the wire electrode into the hole (4). Furthermore, the known guide holder device has also such a shortcoming that an electric corrosion occurs at the metallic holder (1).
If a sapphire guide member (2'), as shown in FIG. 3, is employed instead of the diamond guide member (4), then it is practically possible to form the both ends of the hole (4) into the shape of a truncated cone (4a) (4b), because sapphire has a hardness lower than that of diamond. However, the wear rate of the wall of the hole (4) of the sapphire guide member (2') is considerably higher than that of the diamond guide member.
It is an object of the invention to provide an improved guide holder of an EDM apparatus, said guide holder comprising a diamond guide member and not having any shortcomings as mentioned above.
SUMMARY OF THE INVENTION
This invention relates to a guide holder of an EDM apparatus having a wire electrode, wherein a guide member is disposed in or attached to the guide holder, and the guide member is so designed that a cap is fixed to one side of a diamond body which has a hole for passing through the wire electrode, that a pedestal is fixed to the other side of the diamond body, and that the cap and the pedestal each have a truncated conical hole which is in communication with the hole of the diamond body.
According to an embodiment of the invention, the diamond body, the cap and the pedestal are tightly fixed to one another with the aid of fixing means. The fixing may be accomplished, for instance, by employing an adhesive or by conducting a sintering operation.
The outer surface of the guide holder may be coated with an electrically non-conductive film i.e. an electrically insulative film as shown below.
It is advantageous that the front edge of the cap should be disposed at a position projected over the front edge of the guide member-supporting area of the guide member as explained in detail in the below.
It is preferred that the cap should be made from a non-conductive material such as sapphire, ruby, a ceramic material or the like. On the other hand, the pedestal is preferably composed of a metallic material.
BRIEF EXPLANATION OF ACCOMPANYING DRAWINGS
FIG. 1 is a schematic longitudinal sectional view of a known EDM apparatus, wherein the relationship between the guide holders and the wire electrode is illustrated.
FIG. 2 is a longitudinal sectional view of a known guide holder having a diamond guide member.
FIG. 3 is a longitudinal sectional view of a known sapphire guide member.
FIG. 4 is a longitudinal sectional view of an examp
REFERENCES:
patent: 978302 (1910-12-01), Joyce
patent: 2699692 (1955-01-01), Kronouer et al.
patent: 4250371 (1981-02-01), Haug et al.
patent: 4260397 (1981-04-01), Bovenkerk
patent: 4378690 (1983-04-01), Stiebritz et al.
patent: 4392397 (1983-07-01), Engelfriet et al.
Industrial Diamond Review, W. Stiebritz et al., vol. 42, No. 492, May, 1982, p. 322.
Albritton C. L.
Evans Geoffrey S.
Ogura Jewel Industry Co., Ltd.
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