JPS6018315Y2 - Cemented carbide round blade tool - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a round-edged tool whose outer blade portion is made of hardened metal.

Generally, this type of round-blade tool includes a ring body (blade portion) 1 made of cemented carbide, which has a cutting edge 1a on the outer periphery and an inclined surface 1b on the inner periphery, as shown in FIG. The ring body 1 made of hard metal has a diameter smaller than that of the ring body 1, and has a presser ring 2 whose outer peripheral side surface rests on the inclined surface 1b of the ring body 1 made of cemented carbide. 2 are arranged concentrically on one surface of the copper base metal 3, and the outer ring body 1 made of cemented carbide is attached to the inner retaining ring 2 by thermosetting adhesive.
are respectively attached to the base metal 3 by screws 4.

Such round blade tools are used, for example, to cut various element glues and wires mounted on printed circuit boards, but when cutting, round blade tools are used at high speed rotation, so It is extremely dangerous if the hard metal ring body 1 is not fixed to the base metal 3 and the dynamic balance is not sufficiently adjusted.

In this regard, in the case of conventional round-blade tools, as shown in Fig. 2, which is partially enlarged, the adhesive on the upper surface of the base metal 3 and the presser ring 2 are Ring body 1
However, since the base metal 3 and the ring body 1 made of cemented carbide are difficult to be concentric, it is difficult to maintain a sufficient dynamic balance.

Furthermore, it is difficult to achieve concentricity, so it is currently difficult to tighten the presser ring 2 sufficiently.

This idea was made in consideration of the above points, and is an improved round-blade tool made of cemented carbide that can sufficiently maintain dynamic balance and thereby enable sufficient tightening of the presser ring. It provides:

The content of this invention will be clarified by describing the embodiment shown in the attached FIGS. 3 and 4 below.

In this invention, a positioning convex portion 31 is provided on one surface of the base metal 3 and on the inner circumferential side of the ring body 1 made of cemented carbide,
Furthermore, a structural feature is that a convex portion 21 is provided on the inner peripheral side lower surface of the presser ring 2 in contact with the base metal 3, which serves as a fulcrum when screwing.

In the case of the illustrated example, the positioning convex part 31 stands upright on the base metal 3, so that the part 11 of the inner circumferential side of the hard metal ring body 1 has a shape adapted to the positioning convex part 31. is being done.

From only the functional aspect of positioning, the positioning convex part 31 is concave and the cemented carbide ring body 1 is placed in the concave part.
It is also conceivable to fit the inner circumferential portion of the

However, when considering ease of processing and mechanical strength of the cemented carbide ring body 1, it is preferable to use the convex portion 31.

Note that the positioning projections 31 on the base metal 3 and the projections 21 on the lower surface of the birth control ring 2 can be provided over the entire circumference, or can be provided at intervals along the circumferential direction.

Therefore, in the cemented carbide round blade tool of this invention constructed as described above, the cemented carbide ring body 1 is attached to the base metal 3.
When fixing the ring body 1 on top, first, the ring body 1 is aligned concentrically by fitting the upright part 11 on the inner diameter of the ring body 1 with the convex part 31 on the base metal 3, and at the same time, the base metal 3 and the ring body 1 are bonded together. Fix it with an agent.

As this adhesive, it is possible to use a heat-curing adhesive as in conventional adhesives, or an anaerobic adhesive that polymerizes when air is blocked.

Anaerobic adhesives are advantageous in that they do not require heat treatment.

Next, the screw 4 of the presser ring 2 is tightened. In this case, the presser ring 2 uses the convex portion 21 on the lower surface of the inner circumferential side as a fulcrum, and the inclined surface on the outer circumferential side becomes the pressing surface, so that it has a spring effect. Therefore, the ring body 1 can be held down securely.

As described above, in this invention, since the cemented carbide ring body 1 has the positioning convex portion 31 and the convex portion 21 that serves as a fulcrum when screwing are separately provided, the cemented carbide ring body 1 Centering and fixing can be performed at independent locations, and a sufficient dynamic balance can be maintained, thereby making it possible to sufficiently tighten the presser ring 2.

In particular, since the holding ring 2 produces a spring effect, its holding is reliable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a sectional view showing an embodiment of this invention.
FIG. 4 is an enlarged sectional view of the main part of FIG. 3. 1... Cemented carbide ring body, 1a...
Cutting blade, 1b... Inclined surface, 2... Holding ring, 21... Convex portion, 3... Base metal, 3
1... 8 parts for positioning, 4... Screws.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A ring body made of cemented carbide that has a cutting edge on its outer periphery and an inclined surface on its inner periphery, and a ring body made of cemented carbide that has a smaller diameter than this cemented carbide ring body and whose outer periphery is made of cemented carbide. a presser ring that rests on the inclined surface of the ring body made of cemented carbide, and the ring body made of cemented carbide and the presser ring are arranged concentrically on one surface of the alloy, and an outer ring body made of cemented carbide is arranged concentrically on one surface of the alloy. In a cemented carbide round blade tool in which the inner presser ring is attached to the base metal with adhesive and screws, the inner presser ring is attached to one side of the base metal and on the inner circumferential side of the cemented carbide ring body. A round blade tool made of cemented carbide, characterized in that a protrusion for positioning is provided on the positioning part, and a protrusion that serves as a fulcrum when screwing is provided on the lower surface of the inner peripheral side of the presser ring that contacts the base metal. . 2. A request for registration of a utility model characterized in that the positioning convex part stands upright on the base metal, and a part of the inner peripheral side surface of the cemented carbide ring body is shaped to match the positioning convex part. A round blade tool made of cemented carbide according to item 1. 3. The cemented carbide round according to claim 1 or 2 of the utility model registration claim, characterized in that the cemented carbide ring body is fixed on the base metal with an anaerobic adhesive. Blade tool.