JPH10337608A - Sheet installation structure of throwaway rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent falling of a sheet even when a screw to fix a tip on a main body is removed by providing a protruded part on the sheet, furnishing a recessed part corresponding to this protruded part on the main body and fixing the protruded part fitted in this recessed part by fastening it by a screw screwed in the main body. SOLUTION: A T type protruded part 8 is formed below a sheet 4, and a recessed part 9 corresponding to the protruded part 8 is formed on a lower surface of a tip installing part 2 of a main body 1. The sheet protruded part 8 is fitted in the recessed part 9 of the main body 1. The sheet 4 is devised not to fall by screwing a sheet fixing screw 11 by forming a screw hole 10 on the lower surface of the tip installing part 2 of the main body 1, fastening the sheet 4 upward by this screw 11 and pressing the protruded part 8 on the recessed part 9. Consequently, the sheet 4 never falls even when a screw 7 to fix a tip 3 on the main body 1 is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a sheet to a main body of a throw-away rotary tool used for face milling, end mill cutting and the like.

[0002]

2. Description of the Related Art When a throw-away tip is mounted on a tool body by screws, a sheet is interposed between the body and the tip to improve the mounting accuracy of the tip and to prevent damage to the body. Conventionally, there are the following structures for mounting the sheet.

[0003] The sheet is simply a thin rectangular parallelepiped, has a screw hole at the center, and is penetrated by a chip fixing screw together with the chip and is fixed to the main body.

A convex portion is formed on the same sheet as described above, and a concave portion is formed in the chip mounting portion of the main body to fit the convex portion. To mount the sheet, the convex portion is fitted into the concave portion, and both the chip and the sheet are penetrated by the chip fixing screw and fixed to the main body.

[0005] The seat itself has the same structure as that described above, but differs in the structure of screws used for attachment. The sheet screw that penetrates the sheet and is fixed to the body is cylindrical,
A female screw is formed in the inner periphery from one end in the axial direction. A tip screw penetrating the tip is screwed into the female screw to fix the tip.

[0006]

However, the above mounting structure has the following problems. (1) In any of the above-mentioned mounting structures, the sheet may fall off at the time of chip replacement. At the time of chip replacement, since the chip fixing screw is loosened, the sheet may fall off and fall into a gap between the members of the milling machine, which complicates the chip replacement operation.

(2) In the above mounting structure, since the female screw is formed on the screw for the seat, the outer diameter of the screw becomes large, and as a result, the seat itself and the chip become large.

Accordingly, it is a primary object of the present invention to provide a mounting structure in which a sheet does not fall off even if a screw for fixing a chip to a main body is removed.

[0009]

According to the present invention, the above object is attained by providing a convex portion on the sheet to be fitted to the main body and tightening the convex portion with a screw. That is, the mounting structure of the present invention is a seat mounting structure for fixing a sheet interposed between a main body and a tip of a throw-away rotary tool to the main body, wherein the sheet has a convex portion, and the main body has the convex portion. And a convex portion fitted into the concave portion is fixed by tightening with a screw screwed into the main body.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing an example in which the mounting structure of the present invention is applied to a face mill. This milling machine comprises a body 1 having a plurality of chip mounting portions 2, each of which has a chip 3.
Is fixed. The chip 3 is attached to the main body 1 with a sheet 4 interposed between the chip 3 and the main body 1 in order to increase the mounting accuracy. The chip 3 and the sheet 4 are respectively provided with through holes 5 and 6, and are fixed by inserting the chip fixing screws 7 into the through holes 5 and 6 and tightening the chip fixing screws 7.

Here, a T-shaped convex portion 8 was formed below the sheet 1 and a concave portion 9 corresponding to the convex portion 8 was formed on the lower surface of the chip mounting portion 2 of the main body. FIG. 2 is an enlarged view of the vicinity of the chip mounting portion. As shown, the convex portion 8 of the sheet is fitted into the concave portion 9 of the main body. The seat 4 cannot be removed upward by this fitting, but if the chip fixing screw 7 is removed at the time of chip replacement and the sheet 4 is displaced along the recess 9, the sheet 4 falls off from the chip mounting portion 2.

Therefore, a screw hole 10 is formed in the lower surface of the chip mounting portion 2 of the main body, and a sheet fixing screw 11 is screwed in. The screw 4 is used to tighten the sheet 4 upward, and the convex portion 8 is
To prevent the sheet 4 from falling off. Thereby, even if the screw 7 for fixing the chip 3 to the main body 1 is removed, the sheet 4 does not fall off.

Although the shape of the projection 8 is T-shaped in the above description, it is not limited to this shape. A shape having a hook that cannot be pulled out in a specific direction (in the previous example, the axial direction of the sheet fixing screw) when fitted with the concave portion is preferable. For example, a trapezoidal shape that fits in a dovetail groove may be used. In addition, the protrusion may be simply a rod-shaped protrusion. In this case, it is sufficient to tighten with a sheet fixing screw from a direction orthogonal to the axial direction of the rod-shaped projection. That is, the shape of the convex portion may be a shape having a surface pressed against the concave portion by tightening the screw.

In the above example, the projection is formed below the sheet, but it may be formed on the side in contact with the main body. For example, when the sheet is set in the main body, a convex portion may be formed on the inner peripheral side of the main body, and the convex portion may be tightened from the inner peripheral portion of the main body with a sheet fixing screw.

[0015]

As described above, according to the mounting structure of the present invention, it is possible to prevent the sheet from falling off even if the screw for fixing the chip to the main body is removed at the time of chip replacement. Further, the screws penetrating the sheet together with the chip and the sheet itself do not become large.

[Brief description of the drawings]

FIG. 1 is a perspective view of a front milling machine showing a mounting structure of the present invention.

FIG. 2 is an enlarged view showing a mounting state of a sheet in a chip mounting portion of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Chip mounting part 3 Chip 4 Sheet 5, 6 Through hole 7 Chip fixing screw 8 Convex part 9 Depression 10 Screw hole 11 Sheet fixing screw

Claims (1)

[Claims] 1. A mounting structure for fixing a sheet interposed between a main body and a tip of a throw-away rotary tool to a main body, wherein the sheet has a convex portion that fits into a concave portion of the main body, and fits into the concave portion. A sheet mounting structure for a throw-away rotary tool, wherein the combined projections are fastened and fixed with screws screwed into the main body.