JPH0512031U - Head detachable rotary cutting tool - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a head detachable rotary cutting tool which facilitates attachment / detachment of a cutting head and enhances the support stability of the head to enable high-efficiency machining. [Structure] The taper shank 3 at the rear of the cutting head 1 is inserted into the taper hole 7 at the tip of the holder 6. Pass the clamp bolt 9 through the center of the cutting head 1 and insert this bolt into the screw hole 8
Then, the taper shank 3 is press-fitted into the taper hole 7. Further, the head of the clamp bolt 9 is inserted into the seat hole 5 provided on the front surface of the cutting head 1 to engage with the hole surface, and a drive force is applied from the cutting head 1 to the clamp bolt 9 via this engaging portion. Tell the opposite. In this way, the cutting head 1 can be attached and detached only by operating the bolt 9. Further, the cutting force applied to the cutting head 1 causes the bolt 9 to rotate together with the head in the tightening direction to increase the clamping force, and during unclamping, the bolt 9 rotates the head 1 to facilitate detachment of the head, so that quick detachment is possible. Stable support becomes possible.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a head detachable rotary cutting tool that facilitates attachment / detachment of a cutting head and also enhances the support stability of the head to enable highly efficient machining.

[0002]

[Prior Art]

 There are various types of rotary cutting tools with detachable heads, but few of them have a small diameter and have a removable cutting head. In the case of small diameter tools, because of space constraints, it is not possible to adopt the attachment / detachment mechanism used for medium or large diameter tools, and it is not possible to expect stable support of the head with a simple bolt stop. by.

Under these circumstances, when a cutting head made of cemented carbide, cermet, ceramics or the like is combined with a main body made of cemented carbide or steel, as shown in FIG. The cutting head 11 and the main body 12 were V-shaped fitted to each other so that the fitting portion was brazed (ceramic heads were brazed after the fitting surface was provided with a metal layer).

[0004]

[Problems to be solved by the device]

 Since it takes time to replace the head with a brazing joint type cutting tool, the damaged cutting edge is ground and regenerated, and the head is replaced when regrinding becomes impossible.However, with this method, the regrinding cost, Head replacement cost is high. In addition, it is necessary to prepare a large number of spare tools in order to avoid a decrease in the operating rate of the processing machine, which increases the management effort. In addition to this, the head may come off during use.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, this invention adopts a structure in which a taper shank at the rear of the cutting head is inserted into a taper hole at the tip of the holder, and the taper shank is press-fitted and fixed in the taper hole by a clamping means. Further, as a constitution that characterizes the present invention, the clamp means is constituted by a screw hole provided on the bottom surface of the tapered hole of the holder and a clamp bolt which is screwed into the screw hole through the hole at the center of the cutting head. A drive force transmission section is provided between the head and a seat hole in front of the cutting head that receives the head.

[0006]

[Action]

 The cutting head comes off the holder when the clamp bolt that passes through the center is removed, and is fixed to the holder when tightened, which makes attachment and detachment work extremely easy.

Further, when a cutting force acts on the cutting head and only the head attempts to rotate, the force is transmitted to the clamp bolt via the drive force transmission portion, so that the clamp screwed in the direction opposite to the normal rotation direction of the head. The bolt is automatically tightened and the force input to the taper hole of the taper shank is strengthened. Therefore, the stability of the clamp is also ensured.

On the other hand, during unclamping, the cutting head also rotates simultaneously with the reverse rotation of the bolt, so that the head can be easily removed.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a cutting head made of cemented carbide, cermet or ceramics, which has a cutting edge 2 shown in FIGS. 2 and 3 and a taper shank 3 shown in FIG. A bolt hole 4 penetrating through the center and a seat hole 5 located at the entrance of the hole 4 are provided.

Further, the holder 6 made of cemented carbide shown in FIG. 1 is provided with a tapered hole 7 opening to the front surface and a screw hole 8 opening to the center of the bottom surface of this hole.

In the cutting head 1, as shown in FIG. 1, the taper shank 3 is inserted into the taper hole 7, and the clamp bolt 9 passed through the bolt hole 4 of the head is inserted into the screw hole 8 in the normal direction of the cutting head. It is screwed in the opposite direction and fixed to the holder 6. At this time, the clamp bolt is operated by engaging the spanner with the spanner hole 9a (FIG. 2) of the bolt head. The seat hole 5 is an elongated hole so that the hexagonal bolt head is engaged with the hole surface, and the drive force is transmitted from the bolt 9 to the head 1 or vice versa through the engaging portion. The seat hole 5 may have any shape as long as the head portion of the bolt is engaged with the drive force to be transmitted thereto, and may be similar to the head portion of the bolt.

By doing so, there is no looseness or slippage during rotation of the cutting head, and stable machining can be performed. Also, the replacement of the cutting head is speeded up.

[0014]

【effect】

 As described above, in the cutting tool of the present invention, the cutting head can be attached and detached by the operation of one clamp bolt, the cutting force increases the clamping force, and when the unclamping is performed, the clamp bolt changes the cutting head. Since the head can be easily removed by rotating the, the head can be replaced quickly on the machine, and the stability of the head support is improved. As a result, it is not necessary to use a brazing joining type tool, which is disadvantageous in terms of cost, and it is possible to improve machining efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a head detachable rotary cutting tool of the present invention.

FIG. 2 is a front view of the above tool.

[Fig. 3] Side view of the cutting head

FIG. 4 is a side view of the cutting tool with the cutting head brazed.

[Explanation of symbols]

 1 Cutting Head 2 Cutting Edge 3 Tapered Shank 4 Bolt Hole 5 Seat Hole 6 Holder 7 Tapered Hole 8 Screw Hole 9 Clamp Bolt 9a Spanner Hole 11 Cutting Head 12 Body

Claims (1)

[Scope of utility model registration request] 1. A head detachable rotary cutting tool in which a taper shank at the rear of a cutting head is inserted into a taper hole at the tip of a holder and the taper shank is press-fitted and fixed in the taper hole by a clamp means. Consists of a screw hole provided on the bottom surface and a clamp bolt that is screwed into the screw hole through the hole at the center of the cutting head.
A rotary cutting tool characterized in that a drive force transmitting portion is provided between the head of the clamp bolt and a seat hole on the front surface of the cutting head that receives the head.