JPH0214882Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a tool holder mounting device that is used by being set in a tool rest of a lathe, and in particular, a hole into which the insertion shaft of the tool holder is inserted, and The present invention relates to a mounting device including a pressing fixing plunger having a pressing uneven surface that engages with the pressed uneven surface of the part.

(Prior art and its problems) As shown in FIG. 1, a tool holder for a lathe has an insertion shaft portion 3 protruding from a holder body 2 to which a tool 1 such as a cutting tool is detachably attached. On the upper side between the cylindrical shaft portions 4a and 4b at both ends, an axially corrugated pressed surface 5 (serration) is formed. 6 is a positioning recess.

On the other hand, as shown in FIGS. 2 and 3, the mounting device to be set on the tool rest of a lathe, etc. is the insertion shaft portion 3 of the tool holder 7 configured as described above.
and a plunger 10 for pressing and fixing, the lower end of which is provided with a pressing uneven surface 9 formed to be able to engage with the pressed uneven surface 5. 11
12 is the positioning protrusion, and 12 is the plunger 10.
This is a hydraulic cylinder that is driven via a piston portion 10a connected to its upper end.

Conventional mounting device 1 configured as above
When attaching the tool holder 7 to the tool holder 7, the plunger 10 is lifted up by the hydraulic pressure supplied to the hydraulic cylinder 12 or by the biasing force of a lift return spring (not shown) and removed from the hole 8.
The shaft portion 3 of the tool holder 7 is inserted into the hole 8 so that the positioning protrusion 11 fits into the positioning recess 6 . As a result, the pressed uneven surface 5 of the insertion shaft 3 is located directly below the pressed uneven surface 9 of the plunger 10, so that by supplying hydraulic pressure to the hydraulic cylinder 12 and lowering the plunger 10, the plunger 10 can be moved downward. The insertion shaft 3 is pressed downward in a state in which the pressing uneven surface 9 engages with the pressed uneven surface 5 of the insertion shaft 3.

In this way, the insertion shaft 3 is fixed in the hole 8 of the mounting device 13, but as shown in FIG. In contrast to the normal posture (parallel to the pressing uneven surface 9 of the plunger 10), there are cases where the positioning protrusion 11 and the positioning recess 6 are tilted to the left or right within the circumferential play range θ between the positioning protrusion 11 and the positioning recess 6. many. When the plunger 10 is lowered in this state, the pressing uneven surface 9 on the plunger 10 side and the pressed uneven surface 5 on the insertion shaft 3 side come into partial contact as shown in the figure. Since the friction between the lower circumferential surface (the lower circumferential surface of the cylindrical shaft portions 4, 4b) and the lower inner circumferential surface 8a of the hole 8 is very large, the pressing uneven surface 9 and the pressed uneven surface 5 As a result of the pressing action of the plunger 10, the insertion shaft 3 cannot rotate in the direction in which it returns to its normal position so that it is in contact over its entire width. Therefore, there was a strong possibility that the insertion shaft portion 3 would be fixed while the pressed uneven surface 5 remained in an inclined state.

That is, in the conventional mounting device 13, the position of the cutting edge of the tool 1 is shifted within the play range θ every time the tool holder 7 is mounted, so the cutting conditions for the tool 1 change, making it difficult to always perform high-precision cutting. It was difficult to perform this stably.

(Means for Solving the Problems) The present invention proposes a lathe tool holder mounting device that can solve the conventional problems as described above, and its feature is that the insertion shaft of the tool holder is A bearing for rotatably supporting the insertion shaft is installed in the hole into which the insertion shaft is inserted.

(Embodiment) An embodiment of the present invention will be described based on FIGS. 4 and 5. In the mounting device 14 of the present invention,
A bearing 16 that rotatably supports the insertion shaft 3 is installed in the hole 15 into which the insertion shaft 3 of the tool holder 7 is inserted. In this embodiment, the bearing 16 is connected to the cylindrical shaft portion 4 of the insertion shaft portion 3.
Two bearings 17a and 1 that support a and 4b separately
7b, and a cylindrical spacer 19 provided with a lifting passage 18 for the plunger 10 is interposed between both bearings. The bearings 17a, 17
As b, any one can be used, such as a needle roller bearing, a ball bearing, or a roller bearing.

In such a mounting device 14 of the present invention, the insertion shaft portion 3 of the tool holder 7 inserted into the hole 15 is assumed to have its pressed uneven surface 5 aligned with a horizontal surface (plunger 10), as shown in FIG. Even when the plunger 10 is tilted with respect to the pressing uneven surface 9), the insertion shaft 3 is supported by the bearing 16 in a state where it can rotate lightly, so the plunger 10 can be lowered and the pressing uneven surface 9) When the tool holder 7 (insertion shaft 3) is brought into contact with the pressed uneven surface 5 of the insertion shaft 3, the tool holder 7 (insertion shaft 3) easily rotates due to the rotational force acting on the insertion shaft 3 due to the uneven contact at this time. , as shown in FIG. 5, the pressed uneven surface 5 of the insertion shaft 3 and the pressed uneven surface 9 of the plunger 10.
The insertion shaft portion 3 is fixed by the pressing force of the plunger 10 in a state in which the insertion shaft portion 3 is corrected to a normal posture in which the two portions are in contact with each other over the entire width.

Incidentally, the plunger 10 may be of any drive type, such as one that is moved up and down by a hand-cranked handle or a screw jack driven by a motor.

(Operations and Effects of the Invention) As described above, according to the lathe tool holder mounting device of the present invention, the tool holder is equipped with a bearing installed in the hole into which the insertion shaft is inserted.
Since it is in a state where it can rotate extremely lightly and smoothly within the range of play, there is no fear of it being fixed in a tilted state within the range of play, as was the case in the past, and the insertion shaft part always remains stable. Since the insertion shaft can be completely fixed in the normal position where the uneven surface to be pressed and the uneven surface for pressing on the plunger side engage and abut over the entire width, the position of the cutting edge of the tool in the attached tool holder can be adjusted. It is always constant, and it has become possible to always stably perform high-precision cutting using the tool.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a general tool holder;
Fig. 2 is a longitudinal side view showing a conventional mounting device in use, Fig. 3 is a diagram illustrating problems with the conventional mounting device, and Fig. 4 is a longitudinal side view showing an embodiment of the present invention in use. FIG. 5 is a longitudinal sectional front view of the main part thereof. 1... Tools such as bites, 2... Holder body,
3...Insert shaft part, 4a, 4b...Cylindrical shaft part,
5... Uneven surface to be pressed, 7... Tool holder, 8,
15... Hole for inserting the shaft part, 9... Pressing uneven surface, 10... Plunger, 12... Hydraulic cylinder, 14... Mounting device of the present invention, 16, 17
a, 17b... Bearing, 19... Cylindrical spacer.

Claims (1)

[Scope of utility model registration request] A mounting device comprising a hole into which an insertion shaft of a tool holder is inserted, and a pressing fixing plunger having a pressing uneven surface that engages with a pressed uneven surface of the shaft, the A tool holder mounting device for a lathe, characterized by having an internal bearing that rotatably supports an insertion shaft.