JPH0574709U - Cutting tools - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is a clamp mechanism that presses the mounting hole of the tip by the rotation of the eccentric portion to fix it to the mounting seat of the tool body. It was made to be good. According to the present invention, a transmission mechanism 34 is provided between a clamp shaft 10 rotatably provided on a tool body 2 and an operation shaft 30 rotatably provided on the tool body 2 separately from the clamp shaft 10. By providing 36 and rotating the operation shaft 30, the clamp shaft 10 is rotated so that the non-rotating body-like portion 12 provided at the tip of the clamp shaft 10 comes into contact with the mounting hole 14 of the chip 4. It was done. With such a configuration, it is not necessary to provide an operation hole or the like in the clamp shaft 10 itself.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutting tool, and more particularly to a cutting tool in which a throw-away tip can be easily attached to and detached from a tool body.

[0002]

[Prior Art]

 As a conventional example of a clamp mechanism used for the above-mentioned attachment / detachment operation, a "chip clamp mechanism" described in Japanese Utility Model Publication No. 2-4 is known.

The clamp mechanism will be described with reference to FIG. 4. Reference numeral 2 is a tool body, 4 is a throw-away tip, and 6 is a sheet member. A support hole 8 is formed in the tool body 2, and a clamp shaft 10 is rotatably provided in this hole.

In the above-mentioned tip clamp mechanism, by rotating the clamp shaft 10, the inner surface of the attachment hole 14 of the throw-away tip 4 is pressed by the eccentric portion 12 provided at the head thereof, and thus the throw-away tip 4 is thrown. The away tip 4 is pressed and fixed to the support surface 16.

[0005]

[Problems to be solved by the device]

 The clamp member is rotated by inserting a tool or the like into the operation hole 18 provided in the eccentric portion 12. However, if the diameter of the operation hole 18 is too small, the operability when inserting a tool or the like to rotate the operation hole 18 deteriorates. On the other hand, if the diameter is too large, the operability is improved, but the meat Since the thickness becomes thin, the strength of the eccentric portion 12 itself must be sacrificed. Further, since it is the operation of rotating the eccentric portion 12 itself, it can be operated only from above, and the operability is deteriorated depending on the mounting direction when mounting the tool on the machine tool. There's a problem.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the operability while maintaining the strength of the clamp mechanism of the throw-away tip.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention relates to a cutting tool in which a throw-away tip is removably attached to a tip mounting seat provided in a tool body, wherein a tip is projected from the tip mounting seat and the tip mounting is carried out. It is composed of a clamp pin rotatably provided on the tool main body around an axis extending in the direction intersecting with the seat, and an operation mechanism for operating the clamp pin, and the tip of the clamp pin is the throw-away tip. Has a diameter smaller than that of a mounting hole that penetrates in the thickness direction and has a non-rotating body shape centered on the axis, and the operating mechanism includes a shaft portion rotatably supported by the tool body. An operating portion for operating the shaft portion, and a conduction portion interposed between the shaft portion and the clamp pin for transmitting the rotation of the shaft portion to the clamp pin. And are characterized.

[0008]

[Action]

 According to the above configuration, when the shaft portion is operated by the operation portion, the rotation is transmitted to the clamp pin via the conductive mechanism, and the clamp pin rotates. When the clamp pin rotates, the distance from the axis of the clamp pin to the rotation track of the tip changes, and the throw-away tip is fixed to the tip mounting seat.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In the figure, the same parts as those of the conventional example are designated by the same reference numerals to simplify the description. Also in this embodiment, by pressing the eccentric portion 12 at the tip of the clamp shaft 10 against the inner circumference of the attachment hole 14 of the throw-away tip 4, the throw-away tip 4 is fixed to the tool body 2. There is. Further, in the embodiment, since the clamp shaft 10 can be operated by the mechanism described later, the eccentric portion 12 is not provided with an operation hole or the like.

At a position displaced from the attachment position of the throw-away tip 4 to the base end side of the tool main body 2, a support that rotatably supports the operation shaft 30 in parallel with the support hole 8 of the clamp shaft 10. A hole 32 is provided. As shown in FIG. 3, spur gears 34 and 36 each having a number of teeth of 1: 1 are integrally provided at the shaft ends of the clamp shaft 10 and the operating shaft 30, respectively. 34 and 36 mesh with each other to rotate the clamp shaft 10 and the operating shaft 30 in an interlocking manner. Reference numeral 38 is an operation portion provided at the tip of the operation shaft 30, and in this embodiment, it is formed in a hexagonal planar shape so that a hexagon wrench can be inserted.

On the side of the tool body 2 opposite to the surface on which the throw-away tip 4 is attached, a cover 40 is provided at a portion where the support holes 8 and 32 are formed. The cover 40 is fixed to the tool body 2 with bolts 42. A protrusion 42 is formed on the inner surface of the cover 40 to rotatably support the ends of the clamp shaft 10 and the operation shaft 30.

As described above, in the present embodiment, the gears 34 and 36 form a mechanism for transmitting rotation from the operating shaft 30 to the clamp shaft 10. Therefore, when a hexagon wrench or the like is inserted into the operation portion 38 at the tip of the operation shaft 30 and rotated, this rotation is transmitted to the clamp shaft 10 via the transmission mechanism and the eccentric portion 12 can be rotated.

It should be noted that, instead of the above-mentioned one embodiment, the following modifications can be carried out. I. The shape of the operation portion 38 provided on the operation shaft 30 is not limited to the hexagonal hole as in the embodiment, but may be changed into various shapes depending on the tool used. Also, a small handle may be provided so that it can be manually operated.

B. In the embodiment, the operation portion is provided at the tip of the operation shaft so that the direction of the attachment / detachment operation is on the side of the surface on which the throw-away tip is attached. Other directions may be used. Further, depending on the direction of the operation shaft, a transmission mechanism may be adopted instead of the spur gear.

C. In the embodiment, the number of teeth of the spur gear is set to 1: 1. However, since the rotation angle required for the eccentric part for attaching and detaching the clamp is small, the operating shaft has a low torque and the clamp shaft has a small rotation angle. In order to achieve high torque, the gear may have a predetermined reduction ratio.

D. In the embodiment, the tip of the clamp shaft 10 is an eccentric portion, but the shape of the tip is not limited to that of the embodiment, and may be any other non-rotating body centered on the rotation axis of the clamp shaft 10. Good.

[0017]

[Effect of the device]

 As is apparent from the above description, according to the present invention, by operating the operating shaft to rotate the clamp shaft, the non-rotating body-shaped portion at the tip of the clamp shaft is pressed against the attachment hole of the throw-away tip. Alternatively, this pressing can be released, and therefore, the following effects are obtained.

A. Since it is not necessary to directly operate the clamp shaft, it is not necessary to provide a hole or the like for operating the clamp shaft, and therefore the strength of the clamp shaft or the tip of the clamp shaft can be secured. b. Since the transmission mechanism is used, the operating axis can be set freely in the direction of the clamp axis, and therefore the degree of freedom in selecting the operating method for the throw-away tip attachment / detachment operation is high.

[Brief description of drawings]

FIG. 1 is a sectional view of a tip portion of a cutting tool according to an embodiment of the present invention.

FIG. 2 is a side view of the portion of FIG.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view of a conventional example of a tip clamp device.

[Explanation of symbols]

2 Tool body 4 Throw-away tip
10 Clamp shaft 12 Eccentric part (tip) 30 Operation shaft
34, 36 spur gear 38 operation part

Claims (1)

[Scope of utility model registration request] 1. A cutting tool in which a throw-away tip is detachably attached to a tip mounting seat provided on a tool body, wherein a tip is projected from the tip mounting seat and is directed in a direction intersecting with the tip mounting seat. It is composed of a clamp pin rotatably provided around the axis on the tool body and an operation mechanism for operating the clamp pin, and the tip of the clamp pin penetrates the throw-away tip in the thickness direction. Has a smaller diameter than the mounting hole provided therein and has a non-rotating body centered on the axis, and the operation mechanism operates a shaft portion rotatably supported by the tool body and the shaft portion. A cutting tool comprising: an operating portion; and a conduction portion interposed between the shaft portion and the clamp pin to transmit rotation of the shaft portion to the clamp pin.