JPH0135778Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a quick change device for a face milling cutter, and in particular, the face milling cutter can be attached and detached safely and reliably using a clamp bar attached to a machine tool.

Conventional quick-change devices for face milling of this type include, for example, Japanese Utility Model Application Publication No. 53-60191;
As seen in Japanese Utility Model Application Publication No. 56-11025, etc., there are known ones that utilize washers and tightening bolts. However, although this device has become easier to attach and detach, it is difficult to rotate the tightening bolt when the work space is narrow, and the weight of the face milling cutter poses a risk of falling, making it difficult to ensure reliable tightening. It can be difficult.

Therefore, it has become a problem to develop a quick change device for a face milling cutter that allows the face milling cutter to be attached and detached safely and reliably by operation on the machine side.

The present invention has been made in view of the above-mentioned points, and provides a quick change device for a face milling cutter, which is improved so that the face milling cutter forming an annular body can be attached to the end of the main shaft of the machine by using a mounting shaft and a clamp bar. This is what I am trying to do.

Hereinafter, one embodiment of the quick change device for face milling according to the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, 1 is the main shaft of the machine tool, and a mounting shaft 3 and a clamp bar 4 are located in its mounting hole 2, and a face milling cutter 5 can be attached and detached by the clamp bar 4. It's summery.

The mounting shaft 3 consists of a tapered shaft portion 6, a flange portion 7, and a straight short shaft portion 9 that is fitted into the center mounting hole 8 of the face milling cutter 5, and a center hole 10 is bored at the center of the shaft. has been done. Therefore, this mounting shaft 3 constitutes a so-called arbor. The mounting shaft 3 is tapered fitted to the main shaft 1, and is made non-rotatable by the key 11 and the keyway 12.

Further, the clamp bar 4 has a threaded portion 13 formed at one end of the shaft portion 4a, and a petal-shaped engagement flange 14 formed at the other end. and,
The engaging flange 14 is designed to be able to pass through a through-hole portion 15 which is connected to the center mounting hole 8 of the face milling cutter 5 and has a petal shape of a substantially similar shape. The counterbore hole portion 8b of 8 can be locked by applying traction pressure. For this purpose, between the joint end surfaces 16 and 17 of the mounting shaft 3 and the face milling cutter 5, a drive key 18 and a keyway 19 are formed on a part of the circumference, as seen in FIG. In this case, the keyway 19 is shaped like an elongated hole to allow the face milling cutter 5 to rotate within a predetermined range.

Therefore, the clamp bar 4 has its engaging flange 1
4 and the end faces of the mounting shaft 3, the pull stud 21 on the screw 13 side facilitates the traction action. Further, the clamp bar 4 has a key 22 interposed in a key groove 10a provided at an open end portion of the center hole 10 of the mounting shaft 3, and becomes a slidable non-rotating body.

The face milling cutter 5 has cutting tips 23 arranged on its outer periphery, and is fixed by a wedge piece 25 provided with a screw 24, for example.

FIGS. 3 and 4 show modified examples in which the configuration of the mounting shaft 3 is different. In this case, the short shaft portion 9 of the mounting shaft 3 is fitted into the tight hole portion 8a of the mounting hole 2 of the main shaft 1, and is provided with a mounting bolt 26 in addition to the key 11 and keyway 12. This is what I did. Therefore, this mounting shaft 3 constitutes a so-called straight shaft adapter.

In this embodiment, the clamp bar 4 uses a pull stud 21, but is not limited to this, and may be a screw-type draw bolt.

The face milling cutter quick change device of the present invention constructed in this manner first fits the face milling cutter 5 to the mounting shaft 3 provided with the clamp bar 4, and utilizes the drive key 18 and key groove 19. The face milling cutter 5 is rotated by a predetermined angle, for example, 60 degrees in the illustration. Next, clamp bar 4
When the clamp bar 4 is pulled from the rear, the engaging flange 14 of the clamp bar 4 locks the face milling cutter 5 to the mounting shaft 3, and the mounting shaft 3 and the face milling cutter 5 are clamped at the same time.

On the other hand, in order to remove the face milling cutter 5, the face milling cutter 5 can be removed from the mounting shaft 3 by first loosening the clamp bar 4 to unclamp it, and then rotating the face milling cutter 5 by a predetermined angle.

As explained above, in the present invention, the face milling cutter can be attached from the rear of the clamp bar by a traction action, and the face milling cutter can be easily attached and detached by rotating the face milling cutter through a predetermined angle. Therefore, even if the work space is narrow, there is no operational risk since the machine tool is primarily operated, and there is an advantage that safe and reliable tightening can be performed.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts showing an embodiment of a quick change device for a face milling cutter according to the present invention;
FIG. 2 is a partial bottom view, FIG. 3 is a sectional view of a modification and corresponds to FIG. 1, and FIG. 4 is a partial bottom view. 1...Main shaft, 2...Mounting hole, 3...Mounting shaft, 4...Clamp bar, 4a...Shaft portion, 5...
Front milling cutter, 8... Center mounting hole, 8a... Close contact hole portion, 8b... Counterbore hole portion, 10... Center hole, 10a... Keyway, 14... Engaging flange, 15...
...Through hole portion, 16...Joining end surface, 18...Drive key, 19...Key groove, 22...Key.

Claims (1)

[Claims for Utility Model Registration] A face milling cutter 5 having a mounting shaft 3 attached to the end of the main shaft 1 of the machine, and having a center mounting hole 8 formed by a towable clamp bar 4 protruding from the mounting shaft 3. The mounting shaft 3 has a short shaft portion 9 and a drive key 1 at the end protruding from the shaft end of the main shaft 1.
An annular joint end surface 16 having a convex portion 8 is formed,
In addition, a center hole 10 is formed in the axial center direction of the short shaft portion 9 to receive the clamp bar 4 and has a keyway 10a at its open end. The portion 4a is inserted from the center hole 10 of the mounting shaft 3 toward the mounting hole 2 of the main shaft 1, and at the open end of the center hole 10 of the mounting shaft 3, the key 22 located in the key groove 10a is inserted. It is configured to be a slidable non-rotating body, and a petal-shaped engagement flange 14 is provided at the protruding end from the mounting shaft 3, and the face milling cutter 5 is oriented in the axial direction. The center mounting hole 8 drilled in the center has a close-fitting hole portion 8a into which the short shaft portion 9 of the mounting shaft 3 fits, and a through-hole portion 1 having a substantially similar shape through which the engaging collar 14 of the clamp bar 4 can pass.
5 and a countersunk hole portion 8b that receives the traction pressure of the engaging collar 14, and an annular joint end surface 17 on the side of the contact hole portion 8a receives a key 18 for driving the mounting shaft 3, A quick change device for a face milling cutter, characterized in that a long hole-shaped keyway 19 is drilled to allow rotation within a predetermined range relative to an engagement flange 14 of a clamp bar 4.