JPH0144266Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a clamping device for a milling head.

Generally, a milling head is used to attach a milling tool to a milling machine. An example of this is shown in Japanese Unexamined Patent Publication No. 164409/1983. With this milling head, it is necessary to feed the milling tool to the workpiece, but in this case, simply moving the milling head to a predetermined forward position will cause the load from the milling tool to be applied to the milling head during machining. There are problems such as rattling and poor machining accuracy.

Conventionally, the milling head was moved to the forward position by a feed device and then fixed by a clamp device. However, in this conventional device, the feed device and clamp device were provided separately, so two cylinders were required, which increased the number of parts, resulting in high costs, and the cylinder hydraulic circuit and control circuit were complicated. It had the disadvantage of becoming.

This invention was made in order to eliminate such conventional drawbacks, and the piston rod of the cylinder is connected to the milling head through an elastic member, and the milling head is moved to the forward position by the cylinder and then moved to the fixed stopper. From this state, only the piston rod is moved forward while deforming the elastic member, and at this time, the inclined surface of the piston rod moves the clamping member outward to clamp the milling head, allowing milling to be performed with one cylinder. It is an object of the present invention to provide a clamping device for a milling head, which has a simple structure and is inexpensive, for feeding and clamping the head.

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

The drawing shows a milling head clamping device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a head mounting body of a milling machine, and the head mounting body 1 consists of a horizontal cylindrical part 1a and a vertical cylindrical part 1b integrally formed therewith, and a milling head is attached to the horizontal cylindrical part 1a. 2 is attached to the vertical cylindrical part 1
A clamp device 3 is provided at b for moving the milling head 2 to the forward position and fixing it at that position.

In the milling head 2, the cylindrical main shaft holder 4 is slidably accommodated in the horizontal cylindrical portion 1a, and the main shaft 6 is rotatably inserted into the main shaft holder 4 via a bearing 5. A milling tool 7 is detachably attached to the tip of the main shaft 6 (left end in the figure). A rotary shaft 9 is rotatably attached to the right end of the horizontal cylindrical portion 1a in the drawing via a bearing 8, and the rear end of the main shaft 6 is slidably engaged with the rotary shaft 9 by a slide key 10. It matches. A pulley 11 is fixed to the right end of the rotating shaft 9 in the drawing, and although not shown, the pulley 11 is connected to the shaft of a drive motor of a milling machine.

On the other hand, in the clamp device 3, the clamp base 12 is housed in the vertical cylindrical part 1b, the clamp base 12 is fitted and fixed to the outer peripheral surface of the spindle holder 4, and the clamp base 12 is horizontally A sliding path 13 is formed which includes a vertical portion and a vertical portion. Further, a cylinder 14 is provided on the right side wall of the vertical cylindrical portion 1b as shown in the figure.
A piston rod 15 of the cylinder 14 has a piston rod 15 which is further screwed onto the tip thereof, and an inclined cam surface 16a is formed on the outer surface of the rod 16. This rod 16 is inserted into the horizontal portion of the slideway 13 and is prevented from coming off in the right direction in the figure by its flange portion 16b.
A predetermined gap is provided between the tip of the rod 1 and the back surface of the contact portion 12a of the clamp stand 12.
A plurality of disc springs 17 are disposed on the outer periphery of the milling head 2 to urge the rod 16 to the right in the figure, and the cylinder 14 presses the milling head 2 via the disc springs 17 to move forward, that is, as shown in the figure. It is designed to be moved to the left.

Further, a fixed stopper 18 is formed on the left side wall of the vertical cylindrical portion 1b in the drawing, facing the contact portion 12a of the clamp table 12, and the fixed stopper 18 is configured to restrict the milling head 2 to its forward position. It's summery.

Furthermore, a clamp member 19 is slidably inserted into the vertical portion of the sliding path 13 of the clamp table 12,
An inclined cam receiving surface 19 is provided at the lower end of the clamp member 19.
a is formed. This clamp member 19 is urged downward in the drawing by a spring member 20, and its inclined cam receiving surface 19a is in contact with the inclined cam surface 16a of the rod 16. In addition, the vertical cylindrical portion 1b
A lid member 21 is fixed to the upper surface of. This lid member 21 has a clamp receiving member 2 which is a device fixing part.
2 is slidably provided, and the clamp receiving member 22
is biased downward in the drawing by a disc spring 23 and positioned by the stepped portion 21a of the lid member 21,
The contact part 12a of the clamp base 12 is the fixed stopper 1
When the rod 16 moves forward by compressing the disc spring 17 from the state in which it is in contact with the cylinder 8, the clamp member 19 is moved upward in the figure by the inclined cam surface 16a of the rod 16, that is, in a direction perpendicular to the stroke direction of the cylinder 14. The clamp receiving member 2 is moved to
It is designed to be pressed into contact with 2.

Next, the operation will be explained.

In this device, before its operation, the cylinder 14
has drawn the piston rod 15 into its interior, and the milling head 2 has been drawn into the head mounting body 1. Further, the inclined cam receiving surface 19a of the clamp member 19 is recessed into the clamp base 12 by abutting against the left end (ie, the lower part) of the inclined cam surface 16a of the rod 16 in the drawing.

When the device is operated from this state, the cylinder 14 is operated to move the piston rod 15 to the left in the figure. Then, the rod 16 presses the clamp base 12 via the disc spring 17 and moves the clamp base 12 to the left in the figure, and the milling head 2 also moves to the left in the figure and the head mounting body 1 protrude from When the piston rod 15 further moves to the left, the contact portion 12a of the clamp table 12 contacts the fixed stopper 18, and the milling head 2 is stopped at its forward position. . From this state, the piston rod 15
When the rod 16 moves, the rod 16 slides within the sliding path 13 of the clamp base 12 while deforming the disc spring 17 (see the two-dot chain line in the figure), and as a result, the inclined cam surface 16a of the rod 16 is clamped. Push member 19 outward. At this time, the clamp member 19 is located directly below the clamp receiving member 22, and the clamp member 19 is pressed by the clamp receiving member 22 to clamp the milling head 2 in its forward position. is rotated by the driving force of the drive motor to rotate the workpiece (not shown).
will be milled.

When the machining is finished, the cylinder 14
begins to draw the piston rod 15 into its interior. Then, the rod 16 slides in the sliding path 13 to the right in the figure while deforming and restoring the disc spring 17, and along with this, the clamp member 19 slides downward by the spring force of the spring member 20, and is attached to the clamp receiver. Moving away from member 22, the clamp is thereby released. When the piston rod 15 further moves to the right, the flange portion 16b of the rod 16 comes into contact with the stepped portion 12b of the clamp table 12 and pulls the clamp table 12 to the right, and the milling head 2 is inserted into the head mounting body 1. In this way, the device returns to its original state.

In the apparatus of this embodiment as described above, only one cylinder is required, and the number of parts can be reduced to achieve cost reduction. In addition, the hydraulic circuit and control circuit of the cylinder are simplified, and the structure can be simplified, which also leads to cost reduction.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications and changes are possible. For example, the rod 16 may be formed integrally with the piston rod 15.

As described above, according to the clamping device for a milling head according to the present invention, the piston rod of the cylinder is connected to the milling head via the elastic member, and the milling head is moved to the forward position by the cylinder to the fixed stopper. From this state, only the piston rod is moved forward while deforming the elastic member, and at this time, the inclined surface of the piston rod moves the clamping member outward to clamp the milling head. The milling head can be fed and clamped by the milling head, thereby reducing the number of parts, simplifying the structure, and reducing costs.

[Brief explanation of the drawing]

The drawing is a cross-sectional side view of a milling head with a clamping device according to an embodiment of the present invention. 2... Milling head, 3... Clamp device, 14... Cylinder, 16... Rod (piston rod), 16a... Inclined surface, 17... Belleville spring (elastic member), 18... Fixed stopper, 19... Clamp member, 22... Clamp receiving member (device fixing part).

Claims (1)

[Scope of utility model registration request] A clamp device for moving a milling head to a forward position and fixing it at that position, the clamp device comprising: a cylinder that presses the milling head via an elastic member to move the milling head to the forward position; and a fixed stopper that restricts the milling head to the forward position. , the piston rod is supported by the milling head so as to be movable in a direction perpendicular to the stroke direction of the cylinder, and when the piston of the cylinder moves forward by compressing the elastic member from the state where the milling head contacts the fixed stopper in the forward position, the piston rod A clamping device for a milling head, comprising a clamping member that is moved in a direction perpendicular to the stroke direction of a cylinder by an inclined surface formed on the surface of the clamping member and is pressed against a fixing part of the device.