JPS6040276Y2 - Tool holding unit - Google Patents

Description

[Detailed explanation of the invention] This invention is a holder (
This is a tool holding unit that consists of a removable connection structure between a head) and a shank that is inserted into the main shaft (spindle) of a machine tool. The main purpose was to connect to

Referring to the drawings showing embodiments, the tool holding unit according to the present invention basically includes a shaft portion 13 having a threaded shaft hole 15 at the shank connecting end of the holder 11, and a shaft portion 13 having a threaded shaft hole 15. A shoulder portion 17 having a plurality of recesses 19a, 19b spaced apart around the shaft is provided in the intermediate portion adjacent to the shaft portion 13, and the shank 21 has a diameter of the shaft portion 13 of the holder 11 on the holder connecting end side. A through-shaft hole 23 having a shaft hole portion 23a with a larger diameter is provided, and an end surface 2 that can abut the shoulder portion 17 of the holder 11 is provided at the holder connection end.
1a, and a holder 11 protruding outward from the end surface 21a.
A plurality of protrusions 25a and 25b are provided that can fit into the recesses 19a and 19b of the shoulder portion 17 of the holder 11, and the shaft hole 23a has a plurality of protrusions 25a and 25b that can be fitted into the screw shaft hole 15 of the shaft portion 13 of the holder 11. The bolt 27 is rotatably extended through the through-shaft hole 23 from the opposite-head connection end, and the shaft part 13 of the holder 11 can be fitted into a ring on the outer side of the inner peripheral part of the shaft hole part 23a. 29 is slidably inserted with the outer end protruding outward beyond the end surface 21a as the outermost position, while the ring 29 is inserted in the inner circumference of the shaft hole 23a at its outermost position. At least one member that is biased outwardly to assume the outer position and whose inner diameter can be reduced to less than the diameter of the shaft portion 13 of the holder 11 with the outer peripheral portion pressed against the inner peripheral portion of the shaft hole portion 23a during compression. Insertion of a stacked disc spring 31 including one interference-fit disc spring 31a, 31b; threaded engagement between the threaded shaft hole 15 of the waist shaft part 13 and the bolt 27; and the shaft part 13 and at least one interference-fit disc spring 31a. , 31b, contact between the shoulder portion 17 and the end surface 21a, and the recesses 19a, 19b and the protrusion 25a,
25 b, the holder 11 and the shank 21
A distinctive feature of the configuration is that it connects the

In the above, the threaded engagement between the threaded shaft hole 15 of the shaft portion 13 and the bolt 27 is achieved by guiding the distal end of the shaft portion 13 into the ring 29 through the through-shaft hole 23 from the opposite end of the shank 21 connected to the holder. Bolt 2 through the square wrench
7, the press contact between the shaft portion 13 and the interference-fit disc springs 31a, 31b is achieved by attaching a holder to the outer end of the ring 29 in the process of screw engagement between the screw shaft hole and the bolt 27. 11 are engaged, and the ring 29 is pushed inward of the shaft hole 23a against the acting force of the stacked disc spring 31 including the interference-fit disc springs 31a and 31b. The interference fit is caused by the compression of the disk springs 31a, 31b, and the contact between the shoulder 17 and the end surface 21a and the fitting between the recesses 19a, 19b and the protrusions 25a, 25b are caused by the screw shaft hole 15 and the bolt 27. This occurs at the stage when the threaded engagement with the screw has reached its end point.

According to the tool holding unit according to this invention, the holder 11 and the shank 2
1 are substantially rigidly connected, and at the same time, the press-fit engagement force of the interference-fit disc springs 31a, 31b with respect to the shaft portion 13 corresponds to the centering force that aligns the axis of the holder 11 with that of the shank 21, so that both are connected in alignment with substantially aligned axes.

In the holder 11 of the tool holding unit according to this invention, the shaft portion 13 generally has a shaft hole portion 23a as shown in the figure.
In relation to the first ring 29 and the stacked disc spring 31, it can be formed into a cylindrical shape, but if necessary, it can be formed into any cylindrical shape such as an elliptical cylinder shape, a square cylinder shape, or a combination thereof.

The shoulder 17 can also typically be formed in the form of a flange as shown.

Note that the depressions 19a and 19b are generally as shown in the figure.
It is sufficient to provide them at two diametrically opposed locations.

On the other hand, in the shank 21 of this tool holding unit,
The structure can be simplified by forming the projection 25at25b projecting from the end surface 21a into a shape that also functions as a stopper for the ring 29, as shown in the figure.

Further, the bolt 27 can generally be disposed so as to be rotatably supported by a metal 28 screwed adjacent to the shaft hole 23a.

Furthermore, the stacked disc spring 31 is generally fitted with an interference fit disc spring 31.
Alternatively, the motion-fit disc springs 31c and 31d may be arranged in parallel and facing each other.

[Brief explanation of the drawing]

The drawings show an embodiment of the tool holding unit according to this invention, and FIG. 1 is a side view of the main parts with the holder and shank separated, and FIG. This is a perspective view. 11...Holder, 13...Shaft portion, 15
...Screw shaft hole, 17...Shoulder, 19a
, 19b...Indentation, 21...Shank, 21a...End face, 23...Through shaft hole, 23a...Shaft hole portion, 25a, 25b...
...Protrusion, 27...Bolt, 29...
・Ring, 31...Stacked disc spring, 31a, 31
b...Tight fit disc spring.

Claims (1)

[Scope of utility model registration request] A shank connecting end of the holder is provided with a shank having a threaded axial hole, and an intermediate portion adjacent to the shank is provided with a shoulder having a plurality of recesses spaced apart around the shank; A through shaft hole having a diameter larger than the diameter of the shaft of the holder is provided on the holder connection end side, and the holder connection end has an end surface that can come into contact with the shoulder of the holder, and an end surface that extends from the end surface. A plurality of protrusions that can be fitted into the recesses of the shoulder of the holder are provided, and the shaft center of the shaft hole is provided with
A bolt that can be engaged with a threaded shaft hole in the shaft portion of the holder is rotatably extended from the opposite-head connection end through the through-shaft hole, and is further attached to the outside of the inner circumference of the shaft hole portion of the holder. A ring into which the shaft can be inserted is slidably inserted with the outer end projecting outward beyond the end face as the outermost position, and on the inside of the inner circumference of the shaft hole, The ring is urged outward to assume its outermost position, and when compressed, the inner diameter can be reduced to less than the diameter of the holder's shaft with the outer periphery in pressure contact with the inner periphery of the shaft hole. Insertion of a stacked disc spring including at least one interference-fit disc spring; threaded engagement between the threaded shaft hole of the waist shaft and the bolt; compression between the shaft and at least one interference-fit disc spring; shoulder and end face; A tool holding unit that connects the holder and shank through contact with the holder and fitting between the recess and the protrusion.