JPS6218341Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an adapter that is attached to the spindle of a machine tool and detachably supports a ring-shaped cutter.

(b) Prior Art In order to facilitate replacement of recent milling cutters and the like with a diameter of approximately 200 mm or more, two-piece type cutters are used to speed up the replacement work.

A two-piece cutter, as shown in Fig. 5, consists of a ring-shaped cutter part 1 that is entirely involved in cutting.
and an adapter 2 that supports its inner peripheral surface and one end surface.
A clamp bolt 4 is provided upright on the seat surface 3 of the adapter, and one end of a pothole, that is, a circumferential elongated hole provided at a corresponding position on the cutter part, becomes a large diameter hole into which the bolt 4 can be inserted and removed. The two are connected using the hole 5, and this cutter is made by loosening the bolt 4 that is locked in the small diameter part of the pothole 5, and then attaching the cutter part 1.
By slightly turning in the direction of the arrow, the cutter part can be removed while the adapter is still installed in the machine, and a considerable quick change effect can therefore be obtained, so it has already become popular.

(c) Problems to be solved by the invention However, it is still difficult to operate the clamp bolts when the cutter is used, for example, when the cutter is installed downward, or when there are usually 4 to 8 clamp bolts. There are problems such as having to tighten and remove all of the parts, and further improvements are desired in terms of quick change.

(d) Means for solving the problems The object of this invention is to provide an improved adapter that can meet such requirements.

That is, this invention has the structure of an adapter in which a piston with a small diameter rod tip protruding above the seat surface is attached to all positions corresponding to the clamp bolt holes (daruma holes) of the cutter in the direction of releasing the clamp with a spring. At the same time, a clamp flange is formed at the tip of the rod of the piston to engage with the small diameter portion of the clamp bolt hole, and one or more thrust forces operable from the outside are provided at other appropriate locations where the piston is not present. A structure in which a thrust applying means and an operating piston to which a thrust is applied from the means are provided, and the thrust applying means and the operating piston are used as hydraulic pressure sources to apply hydraulic pressure generated in the adapter to all clamp pistons simultaneously in the clamping direction. It is said that

In this way, by simply operating one of the thrust applying means, the plurality of clamp pistons move forward and backward at the same time in conjunction with the operation piston, so that clamping and unclamping of the cutter is facilitated and speeded up.

In addition, since the adapter itself is equipped with a hydraulic pressure generation source, there is no need for a special external hydraulic source, and there is no need for a complex hydraulic supply mechanism that connects the hydraulic source and the rotating adapter. complication and economic loss can be avoided.

(e) Embodiment An embodiment will be described below based on the attached FIGS. 1 to 4.

The adapter shown in Figures 1 to 3 has its main body 1.
0 has a mounting reference boss 11 that supports the inner surface of the ring-shaped cutter 30 and a seat surface 12 that is perpendicular to the mounting reference boss 11 and supports one end surface of the cutter, as in the conventional one. At the rear of the bottom surface 12 of the main body 10 is a cylinder in which a clamp piston 14, which is biased in one direction by a spring 13 (FIG. 2), faces in the axial direction, at all positions corresponding to the clamp bolt holes 31 of the cutter. 15 in a fluid-tight manner. Further, a small-diameter piston rod 14a that protrudes above the seat surface 12 is connected to one end surface of the piston 14.
A clamp collar 14b is formed at the tip of this rod to engage with the opening edge 31a of the small diameter portion of the bolt hole 31.

Further, as shown in FIGS. 1 and 3, a cylinder 16 facing in the radial direction is provided at an appropriate location where the piston 14 is not present, and a pin 17 erected on the tip surface is inserted into the cylinder 16 to connect the pin 17 to the main body. The operating piston 19 is inserted into the hole 18 and is prevented from rotating, and the screw shaft 19a extending from the rear of the piston is screwed into the operating piston 19.
An operating screw 20 is also provided as a thrust applying means that is supported by the main body and rotates at a fixed position. Note that the end face of the screw 20 is provided with a hole 20a for engaging the operating handle from the outer periphery of the adapter. Further, it is preferable that this screw has a ball 21 interposed between it and the support member 22 to receive a thrust load and smooth the rotation thereof.

Next, the cylinder 16 that houses the operating piston
All the cylinders 15 housing the clamp pistons are connected by an annular liquid passage 23 having branch passages 23a and 23b, and each cylinder 15, 16 and the liquid passage 23 are supplied with hydraulic oil for the piston. It is enclosed. Therefore, the piston 19, which is given a propulsive force by the rotation of the operating screw 20,
As the cutter moves forward toward the center, the pressure of the sealed oil increases, and this force acts equally on all the clamp pistons, pushing each piston 14 in the clamping direction, and by pressing the crank collar 14b against the end surface of the bolt hole, The cutter 30 is firmly fastened to the adapter 10. To remove the cutter, screw 2.
When 0 is reversed, the piston 19 retreats, and the resulting drop in internal hydraulic pressure and the restoring force of the spring 13 compressed during clamping cause the clamp collar 14b to move back.
The pressure contact is released.

Here, one set of operating screw 20 and piston 19 is acceptable, but to make the work easier, it is better to provide several sets on the outer periphery of the adapter. In the embodiment shown in the figure, two sets are provided at positions shifted by 180 degrees in phase, and an equal clamping force is applied to all clamp pistons regardless of which one is operated.

In addition, it may be easier to operate the screw 20 if it is located on the end face of the adapter. Therefore, in such a case, as shown in FIG. The adapter may be installed on the front side or on the rear side with the mounting direction reversed from the figure.

Furthermore, the means for applying thrust to the piston 19 is not limited to the above-mentioned operation screw, and other suitable methods may be employed.

In the figure, 24 is a filler port for sealed oil, 25 is a lid that closes the opening, and 26 is an air vent hole that is closed by a screw plug 27.

(f) Effects As explained above, the adapter of this invention is
Since all the clamp pistons having clamp flanges are linked to the operating piston to which the thrust force is applied by the thrust force applying means, the cutter replacement work can be further speeded up.

Further, since the thrust applying means such as the operating screw can be installed anywhere as long as there are no design problems, it can be installed at a location where it is easy to operate, and operations such as steering operation can be performed easily.

Furthermore, since the clamp piston is operated using hydraulic pressure, the cutter's clamp bolt hole does not need to penetrate through the cutter body as in conventional methods, and there is also the problem of chips entering through the bolt hole, which has a negative effect on assembly accuracy. It will be resolved.

Additionally, hydraulic pressure is generally supplied to rotating tools by using a hydraulic power source installed separately from the tool and supplying it to the tool via a complex supply mechanism. Although reliability is reduced and it is economically disadvantageous, this adapter has a simple structure and has a built-in hydraulic power source.
There is no need to worry about such problems occurring.

Although the adapter of the present invention tends to be somewhat expensive due to its configuration, it is not disadvantageous economically when considering the improvement in the operating rate of the machine tool due to the improvement in the quick change effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the adapter of this invention, and FIG. 2 is a cross-sectional view taken along the line - above.
FIG. 3 is a sectional view taken along the same line, FIG. 4 is a sectional view showing another embodiment, and FIG. 5 is a perspective view of a part of the conventional two-piece cutter. 10...Adapter body, 11...Mounting reference boss, 12...Seat surface, 13...Spring, 14...
... Clamp piston, 14a ... Piston rod, 14b ... Clamp collar, 15, 16 ... Cylinder, 19 ... Operation piston, 19a ... Screw shaft, 20 ... Operation screw, 23 ... Liquid passage, 30 ...
...Katsuta, 31...Clamp bolt hole.

Claims (1)

[Claims for Utility Model Registration] (1) An attachment reference boss 11 that is provided protruding from the center of the tip of the adapter body 10 and is fitted into the center hole of the ring-shaped cutter 30, and the area around the base of this attachment reference boss 11. A seat surface 12 is provided on the adapter body 10 at right angles to the axis of the mounting reference boss 11 and presses one end surface of the cutter 30, and a clamp bolt is provided on the adapter body 10 at a predetermined pitch in the circumferential direction on a circle concentric with the axis. A first cylinder 15 is provided inside the adapter main body 10 behind the seat surface 12 in correspondence with each of the holes 31, and the clamp bolt hole 31 is a circumferential long hole with one end having a large diameter and the other end having a small diameter. The rod 14a has a diameter smaller than that of the small diameter part of the clamp bolt hole 31, and has a flange 14b formed on one end thereof, which is inserted into the large diameter part of the clamp bolt hole 31 and locked onto the other surface of the small diameter part of the hole 31. A piston 14 is inserted into each first cylinder 15 so as to be able to move in the axial direction with the tip end of the rod protruding liquid-tightly above the seat surface 12, and a spring biasing the piston in the direction in which the small diameter rod 14a projects. 13
and one or more second cylinders 16 provided within the adapter body 10 at locations where the first cylinder does not exist.
, an operating piston 19 inserted into this cylinder 16, and the piston 1 that can be operated from the outside.
The means for applying thrust to the piston 14 and the oil-filled portion of the first cylinder 15 that applies hydraulic pressure in the opposite direction to the biasing force of the spring 13 to the piston 14 are all connected to the oil-filled portion of the second cylinder 16. A two-piece cutter adapter comprising a liquid passage for communication. (2) The thrust applying means is composed of an operating screw 20 that is rotatably held in a fixed position and a screw shaft 19a that is provided at one end of the operating piston 19 that is prevented from rotating and is screwed into a threaded hole of the operating screw 20. 2. An adapter for a two-piece cutter according to claim (1) of the claimed utility model registration, characterized in that the adapter is an adapter for a two-piece cutter.