JPS62130111A - Drill - Google Patents

Abstract

PURPOSE:To obtain a drill having rigidity and a cutting edge strength at a low cost by forming a hard metal layer on the surface of a drill body made of a fiber reinforced resin, in a drill for soft materials such as Al, plastic, etc. CONSTITUTION:A drill body in which the inside of a heat curing resin of polyimide, epoxy, etc. is reinforced by SiC fiber and the like, is manufactured by injection molding, and a hard metal layer 5 of TiC, TiN, WC, etc. is bonded to its surface by means of a physical deposition method. Thereby, the surface of the cutting edge 2a is formed into a hard TiC layer, having a cutting edge strength and rigidity that sufficiently stands the machining of soft materials, obtaining a drill excellent in wear resistance, while enabling manufacture at a very low cost.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a drill.

[Prior art and its problems] In general, a twist drill has two helical grooves formed on the drill body, a flank with a cutting edge on the tip face of the drill body, and a groove at the intersection of the flanks. It has a chisel edge and is used for drilling not only metal materials but also all kinds of materials such as concrete and plastic.

By the way, in the twist drill described above, the material to be cut is relatively soft, such as aluminum or plastic, so even if the rigidity of the drill body is not required, a hard cutting edge is attached to the tip of the drill body. Due to the need to form a drill body, extremely hard alloys such as high speed steel are used as the material for the drill body. However, since high-speed steel is expensive, there is a problem in that the twist drill becomes unnecessarily expensive.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a twist drill that has rigidity and cutting edge strength commensurate with soft cutting materials and can be manufactured at a low cost. It is.

[Means for Solving the Problems] In the present invention, a drill is constructed by forming a hard gold captive layer on the surface of a drill body made of hard resin.

[Embodiment] FIGS. 1 and 2 are diagrams showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 indicates a drill body. The drill body I is made of polyimide resin (hard resin), Evokin resin (
It is preferably made of a thermosetting resin such as a hard resin (hard resin), and preferably has SiC fibers etc. densely packed inside with the longitudinal direction thereof facing the axial direction of the drill body l. The tip surface of the drill body l has a flank 2 having a cutting edge 2a.
2 are formed, and a chisel edge 3 is formed at the intersection of these flank surfaces 2. Further, on the outer periphery of the drill body I, twisted grooves 4, 4 extending from the flanks 2, 2 to the rear end portion of the drill body I are formed.

Furthermore, a hard metal layer 5 is formed on the surface of the drill body 1. The hard metallic layer 5 is made of TiC1T iN,
It is made by fixing WC etc. to the surface of the drill body 1 by physical vapor deposition.

In the twist drill having the above configuration, the hard metal layer 5 is formed on the surface of the drill body l made of polyimide resin, etc., so the surface of the cutting edge 2a becomes a layer of hard TiC etc., and the surface of the cutting edge 2a becomes a layer of hard TiC etc. The drilling of the material not only increases the strength and rigidity of the cutting edge to withstand processing, but also improves the wear resistance. Therefore, since the trill main body I can be manufactured by injection molding, it can be manufactured at extremely low cost and in one go.

[Effects of the Invention] As explained above, the twist drill of the present invention has a structure in which a hard metal layer is deposited on the surface of the drill body made of hard resin, so it is suitable for cutting soft materials. It is possible to obtain high rigidity and cutting edge strength, and also to be able to manufacture it at an extremely low cost.

[Brief explanation of drawings]

1 and 2 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a side view showing a twist drill, and FIG. 2 is a sectional view taken along the line ■--■ in FIG.

Claims (2)

[Claims] (1) A drill characterized in that a hard metal layer is formed on the surface of a drill body made of hard resin. (2) The drill according to claim 1, wherein the drill body is made of fiber-reinforced resin.