JPS6140460Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a honing tool, more specifically, by moving a cone fitted into the tool body forward and backward in the axial direction, a grinding wheel fitted into a radial hole of the tool body is expanded and contracted. This relates to a honing tool.

Conventionally, in general, in the honing tool of the above type, a step is provided on both sides of the grindstone, and two annular grooves are provided in the tool body that intersect with the step, and an O-ring made of an elastic member is installed in the groove. The elasticity of the O-ring presses the grindstone against the cone to prevent the grindstone from flying out during honing, and allows the grindstone to expand and contract as the cone advances and retreats.

However, in the above structure, since the grindstone is provided with a step, the shape of the grindstone is complicated, and in order to increase the amount of expansion of the grindstone, the groove depth of the annular groove of the tool body must be increased. In other words, the wall thickness of the annular groove of the tool body becomes thinner and the strength becomes weaker. Therefore, the groove depth cannot be made very deep, which has the disadvantage that the useful life of the grinding wheel is short.

The present invention was made to eliminate the above-mentioned conventional drawbacks, and an annular groove is provided on the outer periphery of the tool body, which partially intersects the front and rear ends of the radial hole, which is the grindstone mounting hole. By elastically holding the O-ring on the side of the O-ring fitted in the groove and pressing it against the cone by the returning force of the O-ring, there is no step on the grinding wheel and the tool body is deeper than the O-ring diameter. To provide a honing tool which prevents a grindstone from flying out without providing an annular groove and extends the effective life of the grindstone by increasing the amount of expansion of the grindstone.

Next, the present invention will be explained with reference to the drawings which are one embodiment.

In the figure, 1 is a tool body, and this tool body 1 is provided with four radial holes 2 for fitting a grinding wheel on the same circumference, and the front and rear ends of the radial holes 2 are partially connected to each other. 2 having a depth approximately equal to the diameter of the O-ring 4 made of an elastic member and intersecting with each other.
A striped annular groove 3 is provided.

Note that the distance L between the ends of the two annular grooves 3, 3 is slightly smaller than the length l of the radial hole 2,
That is, the grindstone 5 fitted into the radial hole 2 is held in pressure contact with the elasticity of the O-ring 4 fitted into the annular grooves 3, 3.

Reference numeral 7 denotes a conventionally known cone having a conical surface 8, which fits into the hole 6 of the tool body 1 so as to be able to move forward and backward, thereby expanding and contracting the grindstone 5.

In order to install the grindstone 5 into the radial hole 2, move the cone 7 so that the outer surface of the grindstone 5 is flush with or slightly below the outer surface of the tool body 1, and then insert the O-ring 4 into the radial hole 2. By fitting into the annular groove 2 and moving the cone 7, the grindstone 5 is expanded by the amount necessary for use.

In the above case, since the O-ring 4 is pressed against the inner surface of the annular groove 3 and the front and rear ends of the grindstone 5, the O-ring 4 is twisted by the frictional force due to the expansion of the grindstone 5, and its restoring force becomes stronger. In other words, with this restoring force, the grindstone
This prevents the cone from popping out during the honing process, strengthens the pressing force against the cone 7, and exhibits followability due to cone 7 contraction. In addition, in FIG. 2, 9 is a processed workpiece.

As is clear from the above description, according to the honing tool of the present invention, the whetstone is held by the elasticity of the O-ring fitted in the annular groove provided in the tool body,
By enlarging the grindstone with a cone, a restoring force based on the torsion of the O-ring acts on the grindstone, which can prevent the grindstone from flying out of the tool body during honing. In addition, since the grinding wheel does not have any steps for fitting an O-ring as in the conventional case, the shape of the grinding wheel can be simplified.

Further, the annular groove for fitting the O-ring provided in the tool body may have the minimum depth necessary for fitting the O-ring, so the strength of the tool body is not weakened.

The present invention is particularly effective for small-diameter honing tools, and in this case, the useful life of the whetstone can be greatly extended compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a tool body of a honing tool according to the present invention, and FIG. 2 is a sectional view showing a machining state. 1... Tool body, 2... Radial hole, 3...
...Annular groove, 4...O ring, 5...Wheelstone, 7...
…corn.

Claims (1)

[Scope of utility model registration request] In a honing tool, a grindstone fitted in a radial hole of the tool body is expanded and contracted by moving a cone fitted to the tool body back and forth in the axial direction. An annular groove that partially intersects the front and rear ends is formed, and an O-ring made of an elastic material is fitted into the groove, and the grindstone is held by elastic deformation of the O-ring in the tool axis direction. honing tool.