JPH0574727U - Cutting tools - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a cutting tool capable of stably attaching a sheet between a tip attachment seat of a cutter body and a throwaway tip when screwing. [Structure] The recessed portion 11 of the seat 4 interposed between the tip mounting seat 2 and the throwaway tip 3 is attached to the tip body 1
It is adapted to be engaged with the projection 10 provided on the. As a result, when fixing the seat 4 and the throw-away tip 3 with the clamp screw 6, the seat 4 is prevented from shifting in the surface direction (the direction indicated by the arrow (c)-(d) in FIG. 1). ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutting tool in which a throwaway tip is detachably attached to a tip mounting seat of a cutter body.

[0002]

[Prior Art]

 Conventionally, in this type of cutting tool, a plate-like sheet is attached to a tip attachment seat together with a throwaway tip. This sheet is interposed between the tip mounting seat and the throwaway tip to prevent the tip mounting seat portion of the cutter body from being damaged by the throwaway tip. That is, the throwaway tip is made of a hard material such as cemented carbide, and the cutter body is made of a material such as steel having a hardness lower than that of the throwaway tip. A seat is placed between the tip mounting seat and the throwaway tip to prevent the main body from being damaged.

[0003]

[Problems to be solved by the device]

 By the way, in the cutting tool configured as described above, the sheet is interposed and the throwaway tip is placed on the tip mounting seat of the cutter body. And then screw the clamp screw into the tip body so that the seat and the throw away tip are clamped between the head of the clamp screw and the tip mounting seat of the cutter body. ing.

However, in such a seat fixing method, when the screwing is completed, the seat is fixed in the axial direction of the screw, but on the other hand, when the screwing is not completed. When the screw is loose, the sheet can move in the direction orthogonal to the screw (that is, the sheet surface direction). That is, there is a problem that the seat mounting position may not be completely determined when the screw is fixed, and the seat mounting becomes unstable.

The present invention has been made in view of the above circumstances, and it is possible to stably position the seat between the tip mounting seat of the cutter body and the throwaway tip when screwing. The purpose is to provide a cutting tool that can perform.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, the cutter body is provided with a chip mounting seat to which a chip is mounted with a seat interposed, and these chips and the seat are fixed to the chip mounting seat by a clamp screw. In the cutting tool, the cutter main body is provided with a projection protruding toward the bottom surface side of the tip mounting seat, and the upper surface of the sheet is provided with an engaging portion that engages with the projection.

[0007]

[Action]

 According to this invention, the cutter main body is provided with the projection protruding toward the bottom surface side of the chip mounting seat, and the upper surface of the seat is provided with the engaging portion to be engaged with the projection. The seat can be held in a stable state on the chip mounting seat with the seat engaging part engaged, so that when the seat and chip are fixed with the clamp screw, the seat shifts. Is prevented.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 3A to 3C are views showing the entire cutting tool according to the present invention. In these drawings, reference numeral 1 is a cutter body, reference numeral 2 is a tip mounting seat, reference numeral 3 is a throwaway tip attached to the chip mounting seat 2, and reference numeral 4 is a tip attachment seat 2 and the throwaway tip 3 attached. It is a sheet that can be used.

The cutter body 1 is rotated about an axis 1A. A pair of tip mounting seats 2 are provided at the tip of the cutter body 1, and are provided in a symmetrical positional relationship with the cutter body 1 with the axis 1A therebetween. Further, the bottom surfaces 5 of the pair of tip mounting seats 2 are provided in a positional relationship in which they are parallel to each other, and the throw-away tip 3 is laminated on each of these bottom surfaces 5 with a seat 4 interposed therebetween. .. The throwaway tip 3 is made of a hard material such as cemented carbide, and the cutter body 1 is made of a material such as steel having a hardness lower than that of the throwaway tip 3, whereby the cutter body 1 is not damaged. The seat 4 described above is interposed between the tip mounting seat 2 and the throwaway tip 3 so as not to be attached.

As shown in FIG. 1, the throwaway tip 3 and the seat 4 are provided with mounting holes 7 and 8 through which the clamp screws 6 pass. Then, the throw-away tip 3 is arranged on the tip mounting seat 2 with the seat 4 interposed, and in this state, the clamp screw 6 is inserted into the mounting holes 7 and 8 of the seat 4 and the throw-away tip 3, and further, By screwing the clamp screw 6 into the tip body 1, the seat 4 and the throwaway tip 3 are sandwiched between the head 6A of the clamp screw 6 and the chip mounting seat 2 of the cutter body 1. It has become so. The head portion 6A of the clamp screw 6 is housed inside the chip body 1 as shown in the sectional view of FIG. Further, in FIG. 3, a portion indicated by reference numeral 3A is a blade portion of the throwaway tip 3.

Next, the structure of the attachment portion of the sheet 4 to the cutter body 1 will be described in detail with reference to the sectional view of FIG. 1 in which FIG. 3B is enlarged and FIG. A protrusion 10 is provided on the inner diameter side of the cutter body 1. The projection 10 is provided in a positional relationship facing the bottom surface 5 of the chip mounting seat 2, and the tip end portion thereof is engaged with the recess 11 (engagement portion) provided on the upper surface of the seat 4. ing . Further, the protrusion 10 formed on the cutter body 1 is formed so that the width thereof is gradually reduced toward the tip portion, and thus has a certain elasticity. The projection 10 of the cutter body 1 and the recess 11 of the sheet 4 are arranged in a positional relationship parallel to the axis 1A of the cutter body 1 and have a constant length along the axis 1A. There is.

In the seat mounting structure as described above, the seat 4 is aligned with the bottom surface 5 of the chip mounting seat 2 in the direction of the arrow (a) while the projection 10 is engaged with the recess 11. The sheet 4 is slid (along the axis 1A: see FIG. 1), and thereby the seat 4 is arranged in the state shown in FIG. After arranging the seat 4 on the bottom surface 5 of the chip mounting seat 2 in this manner, the throwaway chip 3 is laminated on the seat 4, and in this state, the mounting holes for the seat 4 and the throwaway chip 3 are attached. By inserting the clamp screw 6 into 7 and 8 and further screwing it into the chip body 1, the seat 4 and the throwaway tip 3 are inserted between the head 6A of the clamp screw 6 and the chip mounting seat 2. Fix it.

A reference numeral 12 in FIG. 1 denotes a groove portion having a circular cross section formed between the bottom surface 5 of the chip mounting seat 2 and the side surface of the chip mounting seat 2. Therefore, the cutter body 1 is prevented from cracking.

In the seat mounting structure as described above, the recess 11 of the seat 4 interposed between the chip mounting seat 2 and the throw-away tip 3 is engaged with the protrusion 10 provided on the chip body 1. Therefore, when the seat 4 and the throw-away tip 3 are fixed by the clamp screw 6, the seat 4 may be displaced in the surface direction (the direction indicated by the arrow (c)-(d) in FIG. 1). This prevents the seat from being mounted between the tip mounting seat 2 and the throwaway tip 3 of the cutter body 1 in a stable state at the time of screwing.

When the seat 4 is removed from the chip mounting seat 2, as shown by reference numeral 20 in FIG. 3, a driver or the like is provided in the recess formed by the notched portion 4A of the seat 4 as shown in FIG. It is advisable that the seat 4 is pushed out in the direction opposite to the arrow (a) direction by pushing in and operating this driver.

[0016]

[Effect of the device]

 As is clear from the above description, according to the cutting tool of the present invention, the cutter body is provided with the protrusion protruding toward the bottom surface side of the chip mounting seat, and the protrusion is engaged with the upper surface of the seat. Since the engaging part of the seat is provided, by engaging the engaging part of the seat with the protrusion of the cutter body, it is possible to hold the seat in a stable state on the chip mounting seat. The sheet is prevented from being displaced when fixing these sheets and chips, and the effect of reliably performing the screwing work of these sheets and chips is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state in which a seat is attached to a cutter body.

2A and 2B are views showing a seat, in which FIG. 2A is a view of FIG. 2B viewed from the direction of an arrow a, FIG. 2B is a front view, and FIG.
It is the figure which looked at from the arrow c direction.

3A and 3B are views showing the entire cutting tool, in which FIG. 3A is a view of FIG. 3B viewed from the direction of arrow a, and FIG.
(C) is the figure which looked at (B) from the arrow c direction.

[Explanation of symbols]

 1 Cutter main body 2 Tip mounting seat 3 Throw away tip 4 Seat 5 Bottom surface of the tip mounting seat 2 6 Clamp screw 7 Mounting hole 8 Mounting hole 10 Protrusion 11 Recessed part (engagement part)

Claims (1)

[Scope of utility model registration request] 1. A cutting tool, wherein a cutter body is provided with a chip mounting seat to which a chip is mounted while a sheet is interposed, and the chip and the seat are fixed to the chip mounting seat by a clamp screw. A cutting tool comprising: a main body provided with a projection protruding toward a bottom surface side of the tip mounting seat; and an upper surface of the seat provided with an engaging portion for engaging with the projection.