JPH0723124Y2 - Tool holder clamping mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a clamping mechanism for a tool holder that is inserted into a hole of a tool mounting portion of a turret of a machine tool.

Conventional technology A clamping mechanism that inserts the shank part of the tool holder into the tool mounting hole of the turret and clamps it.
There is a known technology in the issue. In this tool, two trapezoidal grooves are formed in the shank portion of the tool holder in the axial direction, and two trapezoidal ridges that engage with the trapezoidal grooves are formed on the inclined surface with respect to the axis. Then, the trapezoidal ridges are engaged with the trapezoidal grooves and the tool holder is pulled in by the wedge effect, and at the same time, the shank is pressed against the recess of the tool mounting hole of the collet to be clamped.

Problems to be solved by the invention Since the clamping mechanism of No. 62-156405, which has been described in the related art, strongly clamps the tool holder by the wedge effect, the tool holder can be removed by changing the setup. In this case, the tool holder often does not come off easily even if the clamp piece is loosened.Therefore, there is a problem that the tool holder must be lightly tapped with a soft hammer etc. to separate the contact surface and remove it. There is.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to allow a tool holder to be floated by a loosening operation of a clamp piece to facilitate removal. Is to provide.

Means for Solving the Problems In order to achieve the above object, a tool holder clamping mechanism according to the present invention is configured such that an axis line of a clamp piece is inserted into a groove cut at a right angle to an axis line of a shank portion of a tool holder to be inserted into a turret. In which the tool holder is clamped by engaging the axial ridges formed on the inclined surface with respect to, the contact surface in the direction substantially perpendicular to the groove is provided on the outer periphery of the shank portion of the tool holder, A step surface having a wedge angle that engages with the contact surface by axial movement of the clamp piece in the unclamping direction is provided on a surface of the clamp piece that is perpendicular to the crests, and the step surface of the tool holder is contacted by the unclamping operation. It floats the contact surface and pushes it out slightly.

Action When removing the tool holder that is clamped by the ridge of the clamp piece engaged with the groove of the shank that is inserted into the turret, move the clamp piece axially toward the unclamping side to release the clamp ridge. Is disengaged from the groove. Then, if the axial movement is continued as it is, the step surface having the wedge angle of the clamp piece engages with the sloped surface of the outer periphery of the shank portion,
Float the contact surface of the tool holder so that it can be easily removed.

Example An example will be described with reference to FIGS. 1 to 3.

A plurality of tool mounting portions are provided concentrically along the outer circumference of the surface of the turret, and straight shank holes 2 are bored in the axial direction.

The shank hole 2 is formed with a recess 2a so that the back surface of the trapezoidal groove of the shank, which will be described later, comes into contact with two lines in the axial direction with the shank, that is, at three points with the clamp piece in cross section. Further, a piece hole 3 is formed on the outer peripheral surface of the turret 1 in a direction perpendicular to the shank hole 2 so that the shank hole 2 is partially covered. Hole 2
A right-handed screw hole 3a is formed at a position displaced to the farther side. The tool holder 4 inserted into the shank hole 2 is provided with a groove 4a for mounting the tool T in a right angle direction, and a plurality of fastening bolts 5 are screwed from the groove side. On the outer circumference of the shank 6 of the tool holder 4, a groove 4a is formed in the direction perpendicular to the axis.
The trapezoidal groove 7 is cut in two axially parallel positions, and the stepped portion between the flat surface 4b cut from the shank end side at a right angle to the trapezoidal groove 7 and the groove 4a and the shank outer periphery is inclined. Face 11
Is formed in. The clamp piece 8 for fixing the tool holder 4 has a V-shaped notch formed on a part of a cylinder, which has an inclined surface 8a inclined in the axial direction and an inclined angle 8b perpendicular to the inclined surface 8a. With the same pitch as the two trapezoidal grooves 7 of the shank and in the state of being inserted into the piece hole 3, two trapezoidal ridges 9 with a slight slack on the tool T side were cut parallel to the axis, and the slope 8b had a slope of the shank. A step surface 12 having a wedge angle that engages with the surface 11 is cut in the radial direction. Further, when the clamp piece 8 is inserted into the piece hole 3 of the turret 1, a left screw hole 8c is formed in a position concentric with the screw hole 3a in parallel with the shaft center. Clamp bolt for fixing the tool holder 4 via the clamp piece 8
10 has a hexagonal hole formed in the head, a left screw 10a that is screwed into the left screw of the clamp piece 8 is engraved in the head, and the central part is screwed into the right screw of the screw hole 3a of the turret 1 at the tip. A matching right screw is engraved.

Next, the operation of this embodiment will be described.

Insert the clamp bolt 10 from the back side into the screw hole 8c of the clamp piece 8.
Insert the left screw 10a of the head of the screw half way, insert the clamp piece 8 into the piece hole 3 of the turret, make the right screw 10b face the screw hole 3a at the tip of the clamp bolt 10, and insert the hexagon wrench into the hexagon hole. Then, turn the clamp bolt 10 clockwise and screw it in. When the clamp bolt 10 is screwed into the screw hole 3a, since the screw hole 8c of the clamp piece 8 is a left-hand screw, the clamp piece is also pulled in together with the clamp bolt 10. At this time, the clamp piece is 10
It is drawn into the piece hole 3 at a speed of the value of the sum of the pitch of b and the pitch of the left screw 10a. When the inclined surface 8b of the V-shaped notch passes through the shank hole, the pulling of the clamp piece 8 is temporarily stopped, and the shank 6 of the tool holder 4 in which the tool T is fixed to the groove 4a with the bolt 5 is shank hole. Insert it in 2,
When the clamp bolt is turned clockwise again to retract the clamp piece, the trapezoidal ridge 9 engages with the trapezoidal groove 7 of the shank 6.
Since there are two engaging parts, if one of the trapezoidal slopes comes into contact, the clamp piece is rotated and the other of the trapezoidal slopes comes into contact, and the tool holder 4 is pulled in by the axial resultant force of the two slopes. While the holder head is crimped to the surface of the turret 1, the shank 6 is pressed to the rear side by the component force of the inclined surface in the direction perpendicular to the axis, and the three holes, the two wires at both ends of the hole 2a and the trapezoidal engaging part, are formed. Securely fixed.

When removing the tool holder 4 from the turret 1 by changing the setup, insert a hexagonal wrench into the hexagonal hole of the clamp bolt 10 and rotate it counterclockwise to pull out the clamp piece and remove the trapezoidal engaging part. As a result, the step surface 12 having the wedge angle of the inclined surface 8b abuts the abutment surface 11 of the shank 6, and the wedge effect raises the biting surface of the tool holder at three points, facilitating the removal.

Effect of the Invention Since the present invention is configured as described above, it has the following effects.

Operation to loosen the clamp piece by engaging a step surface having a wedge angle provided on the surface of the clamp piece that is perpendicular to the trapezoidal ridge, with the contact surface that is provided almost perpendicular to the trapezoidal groove of the shank. Since the contact surface of the tool holder is lifted and pushed out slightly, it is easy to remove and the tool replacement time can be shortened.

[Brief description of drawings]

1 is an inclined view showing a clamped state of a tool holder, FIG. 2 is a view showing an engaged state of a tool holder and a clamp piece, and FIG. 3 is a sectional view taken along line AA of FIG. 1 ... Turret, 2 ... Shank hole 3 ... Piece hole, 4 ... Tool holder 6 ... Shank, 7 ... Trapezoidal groove 8 ... Clamp piece, 10 ... Clamp bolt 11 ... Gradient surface, 12 ... … Steps

Claims (1)

[Scope of utility model registration request] 1. A groove (7) cut at right angles to the axis of a shank (6) of a tool holder (4) to be inserted into a turret (1), on an inclined surface with respect to the axis of a clamp piece (8). A tool holder is clamped by engaging an axial crest (9) formed on the outer periphery of the shank portion of the tool holder with a contact surface (11) substantially perpendicular to the groove. , A step surface (12) having a wedge angle that engages with the contact surface by axial movement of the clamp piece in the unclamping direction is provided on a surface of the clamp piece that is perpendicular to the crests, and the unclamping operation is performed. The tool holder clamping mechanism is characterized in that the tool holder is floated by and pushed out slightly.