JPS6140449Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cutting fluid supply device in a holder of a cutting tool with an oil hole.

For many years, cutting tools with oil holes have been used to improve the efficiency of cutting.

This cutting tool efficiently cools the cutting edge, lubricates the cutting edge and the cutting material, and discharges chips by forcibly feeding cutting agent from the outside into a hole that passes through the shaft center to the tip of the blade. Therefore, if the machine tool, cutting fluid feed pump, cutting tool holder, and cutting tool are appropriate, machining efficiency will be significantly improved.

Therefore, methods for supplying cutting fluid to cutting tools with oil holes have been devised and put into practice.

For example, in Utility Model Publication No. 55-15946, a holder for a cutting tool with an oil hole is attached to a machine spindle, and at the same time, a pipe protruding from the holder is fitted into an oil supply stand around the spindle. However, this fitting portion supplies oil and prevents the rotation of the case, and furthermore, the pipe has a mechanism that slides during fitting in order to disengage the main shaft of the case and the holder.

As described above, when one pipe is fitted to supply cutting fluid and stop the case from rotating against the spindle, and also has a sliding surface, the rotational torque of the main shaft of the holder increases as the main shaft of the holder rotates. Due to the friction between the main shaft and the case having the oil receiving stand, the rotational force is also transmitted to the case side, and rotational force is also applied to the hollow pipe.

Therefore, even if the fitting part between the oil supply stand and the hollow pipe is fitted without leakage when the main shaft stops rotating, when the main shaft starts rotating, rotational force is applied to the hollow pipe, causing the oil supply stand to A rotational moment is generated with the case as the center and in the radial direction, and the hollow pipe tilts with respect to the oil supply stand, causing cutting fluid to leak from the gap that occurs, which is a problem especially when using high-pressure cutting fluid or air.

In addition, in recent years, with the improvement of cutting tools, high-speed cutting has become possible, and the main shaft is rotated at a higher speed, which applies a large rotational force to the hollow pipe, making oil leakage even more serious.

The purpose of this invention is to eliminate the above-mentioned drawbacks by preventing cutting fluid from leaking from the supply stand.

This idea is that when the holder is attached to the spindle of the machine, the slide provided on the receiving stand of the holder is pushed back to disengage the main axis of the holder from the case, and the cutting agent supply passage of the feeding stand on the machine side is released. Fitting the tip of the supply pipe protruding from the receiving stand into the terminal opening of the supply stand, and providing a recess in the supply stand into which either the tip of the supply pipe or the tip of the slide shaft fits, The clearance of the fitting part of the recess is smaller than the clearance of the fitting part of the mouth so that the rotational force of the spindle during operation acts only on the fitting part of the recess. To provide a cutting agent supply device in a holder with a foil hole which prevents supply cutting agent or air from leaking.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

In the embodiment shown in FIGS. 1 to 4, 1
A rotating spindle is pivotally supported on a frame 2, and a tapered hole 3 is provided in the tip end surface of this spindle 1.

In addition, a spindle 1 is attached to the tip of the frame 2.
A supply table 4 is provided close to and fixed with screws or the like.

The tip end face of the supply stand 4 is provided with an opening 6 that communicates with a supply passage 5 for oil or other cutting agents, and a recess 7 located outside the opening 6.

Although not shown, the above-mentioned supply passage 5
A hose is connected to the pump.

8 is a holder for a cutting tool, and this holder 8 is
Main shaft 10 having a cutting tool attachment gripping part 9 at the tip
, a shank portion 11 that extends from the end of the main shaft 10 and is fitted into the tapered hole 3;
The grip part 12 of the manipulator provided at the end of the
It is composed of:

A case 14 is provided on the outside of the tip of the main shaft 10 so that the main shaft 10 can freely rotate via a bearing 13.
is fitted.

Further, the supply table 4 is provided on a part of the outer periphery of the case 14.
A receiving stand 15 is provided opposite to the receiving stand 15, and the receiving stand 15 has a supply pipe 16 whose tip fits into the opening 6 when the holder 8 is set on the spindle 1.
The end of is fixed.

The above-mentioned supply pipe 16 is connected to the receiving stand 1 in the illustrated case.
A recessed hole 17 is provided inward from the end surface of the supply pipe 15 , and the end of the supply pipe 16 is fitted into this recessed hole 17 , and leakage is prevented by an O-ring 18 . Since the supply pipe 16 is fixed by screwing in a screw 19 so that its tip contacts the outer periphery of the supply pipe 16, the amount of protrusion of the supply pipe 16 can be adjusted depending on the distance between the supply table 4 and the receiving table 15 when the holder 8 is set. Can be adjusted.

The cutting agent supplied to the supply pipe 16 is transferred from the recessed hole 17 to a passage 20 provided in the receiving table 15.
The oil then flows into the annular chamber 21 provided on the outer periphery of the main shaft 10, flows into the gripping portion 9 through the through hole 22 through which the annular chamber 21 and the inside of the gripping portion 9 communicate, and flows toward the oil hole of the cutting tool.

Further, the receiving stand 15 is provided with a retractable slide shaft 24 whose tip is inserted into the recess 7 and pushes back while compressing the spring 23 when the holder 8 is set on the spindle 1.

Further, the clearance of the distal end fitting portion of the slide shaft 24 fitted into the recess 7 is smaller than the clearance of the distal end fitting portion of the supply pipe 16 fitted into the mouth portion 6.

Further, the slide shaft 24 is provided with a stopper 26 whose tip can escape from an engaging portion 25 such as a notch provided in the main shaft 10 by utilizing the slide of the slide shaft 24 that is pushed back when the holder 8 is set on the spindle 1. It is being

In the illustrated case, the stopper 26 described above has two through holes 27 on the outside and inside of the end portion, and the slide shaft 24 and the supply pipe 16 are passed through the through holes 27, and the slide shaft is inserted from the end of the stopper 26. Screw 2 so that the tip touches the outer periphery of 24.
8 is screwed in to fix the stopper 26 to the slide shaft 24, and the stopper 26 is slid together with the slide shaft 24 regardless of the supply pipe 16.

In addition, as shown in the figure, an engaging portion 2 is provided on the outside of the main shaft 10.
At the same time as fitting the ring 29 having the screw 3
If the ring 29 is fixed to the main shaft 10 by the 0, the position of the engaging portion 25 can be freely displaced.

Furthermore, by chamfering the outer circumferences of the tips of the slide shaft 24 and the supply pipe 16 as shown in the figure, smooth fitting can be achieved.

Next, other embodiments shown in FIGS. 5 to 8 will be described.

A recess 7 is provided in the supply table 4, and a passage 5 is formed at the bottom of the recess 7.
A small diameter portion protruding from the tip of the supply pipe 16 fits into the opening 6, and a tip of the supply pipe 16 fits into the recess 7. At the same time, the clearance of the fitting portion of the recess 7 is smaller than the clearance of the fitting portion of the mouth portion 6.

Further, the slide shaft 24 is configured to collide with the supply table 4 and push it back.

Note that the fitting portion between the supply table 4 and the supply pipe 16 has a convex shape on the supply table 4 side, and the supply pipe 16
The sides may be concave.

In the figure, 31 is an O-ring provided on the outer periphery of the tip of the supply pipe 16 to prevent oil leakage, 32 is a recessed hole provided inward from the end surface of the slide shaft 24; A spring 23 is fitted. 33 is the main shaft 10 located within the annular chamber 21.
Since the blades 33 rotate together with the main shaft 10, they function as a pressure booster pump and can supply a considerable amount of cutting fluid to the tip of the cutting tool.

The holder with an oil hole according to this invention has the above structure, and when the holder 8 is stored in the magazine, the slide shaft 24 is pushed out by the spring 23, so that the tip of the stopper 26 is placed in the engaging portion 25. Fits in and engages, case 1
4 and the main shaft 10 are prevented from relative rotation.

Further, the holder 8 inside the magazine is attached to the recessed part 34.
The magazine side attitude regulating device is engaged with the magazine side attitude regulating device.

From this state, the manipulator grasps the holder 8, takes it out of the magazine, and conveys it to the spindle 1 side.

At this time, the engaged state between the engaging portion 25 and the stopper 26 is maintained.

Therefore, when the shank portion 11 of the holder 8 is fitted into the tapered hole 3 of the spindle 1 and the holder 8 is set on the spindle 1 by the wedge effect, the tip of the supply pipe 16 is placed in the recess at the mouth portion 6 at the same time. 7 and the slide shaft 24 is pushed back, so that the stopper 26 moves back together with the slide shaft 24, and the end of the stopper 26 is disengaged from the engaging portion 25.

Therefore, the engaging portion 25 and the stopper 26 are disengaged, and the main shaft 10 becomes free with respect to the case 14.

From this state, when a rotational force is input to the spindle 1 and the pump is operated, the main shaft 10 and the cutting tool set on the main shaft 10 rotate together, and the cutting fluid is supplied to the passage 5, the supply pipe 16, the passage 20, and the annular shape. It flows into the chamber 21 and the through hole 22, and is discharged from the tip of the rotating cutting tool.

Further, when the holder 8 is removed from the spindle 1 by the manipulator, the tip of the supply pipe 16 comes out from the mouth part 6 due to this operation, and at the same time, the pushing back of the slide shaft 24 is released, so that the slide shaft 24 is pushed back by the spring 23. being pushed out.

Therefore, together with the slide shaft 24, the stopper 2
6 moves forward, and the tip of the stopper 26 fits into the engaging portion 25 and engages with the case 14 and the main shaft 1.
The relative attitude with respect to 0 is maintained constant. In other words, the supply table 4 and the receiving table 15 are transported while keeping the correspondence relationship unchanged.

In addition, if the cutting agent supply path and the air supply path are connected to the supply table 4 and the cutting agent or air can be supplied by operating the switching valve, air can be supplied to remove chips and clean. , can cut cast iron.

In addition, there is a problem with models in which the mechanical dimensions around the main shaft and spindle differ due to the displacement of the engaging portion 25 due to the rotation of the ring 29, the adjustment of the protruding length of the supply pipe 16, and the displacement of the position of the stopper 26. , eliminates incompatibility problems caused by problems such as the spindle involved when setting the holder, the spindle viewed from the center of the spindle, the angle between the spindle key and the receiving stand, and the dimensional difference between the supply stand and the tip of the supply pipe. can do.

As described above, according to the cutting table supply device for a holder with an oil hole according to this invention, when the holder is set on the spindle, the opening of the cutting fluid supply passage provided in the supply table of the spindle side frame is removed. Fit the tip of the supply pipe into the
Either the tip of the slide shaft or the tip of the supply pipe is fitted into the recess, and the clearance of the fitting part of the recess is smaller than the clearance of the fitting part of the mouth, so that the tip of the slide shaft or the tip of the supply pipe is fitted into the recess. Since the rotational force transmitted to the case is stopped at the recess with a small clearance in the fitting portion, no rotational force acts on the fitting portion between the supply pipe and the mouth.

This eliminates cutting fluid leakage during operation.
High pressure cutting fluid or air can be used.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the device according to this invention, Fig. 2 is a bottom view of the same as above, and Fig. 3 is Fig. 1
4 is a partially cutaway side view, FIG. 5 is a partially cutaway front view of another embodiment, FIG. 6 is a bottom view of the same as above, and FIG. 7 is a partially cutaway side view. A sectional view taken along the Y line, and FIG. 8 is a partially cutaway side view. 1... Spindle, 2... Frame, 3... Tapered hole, 4... Supply stand, 5... Oil supply passage, 6...
...Mouth, 7...Recess, 8...Holder, 9...Gripping part, 10...Main shaft, 11...Shank part, 12
...Gripping part, 13...Bearing, 14...Case, 1
5... Receiving stand, 16... Supply pipe, 17... Recessed hole, 18... O-ring, 19... Screw, 20...
...Passway, 21...Annular chamber, 22...Through hole, 23...
... Spring, 24 ... Slide shaft, 25 ... Engagement part,
26...stopper.

Claims (1)

[Scope of utility model registration request] A main shaft having a gripping part for a cutting tool at its tip and a gripping part for a manipulator and a connecting part to a spindle at its end, a case fitted outside the tip of the main shaft so that the main shaft can rotate freely, and an outer periphery of the case. A receiving stand provided in the main shaft, a supply pipe whose end is fixed to the receiving stand so as to protrude from the receiving stand toward the distal end of the main shaft, and a supply pipe extending parallel to the receiving stand and applying extrusion force by a spring to the receiving stand. A slide shaft whose end is slidably supported, a passage provided in the receiving stand so that the annular chamber provided on the outer periphery of the main shaft communicates with the end of the supply pipe, and a passage provided in the main shaft from the annular chamber to the gripping portion. The holder is composed of a through hole provided to communicate with each other, and an engagement mechanism provided between the distal outer periphery of the main shaft and the slide shaft so that the engagement is released when the slide shaft is pushed back. A cutting agent supply table is provided to push back the slide shaft when the holder is attached, and a mouth part communicating with the cutting agent supply passage is provided so that the tip of the supply pipe fits into the supply table, and a tip part of the supply pipe or the slide shaft is provided. A recess is provided into which one of the tips fits, and the clearance of the fitting part of the recess is as follows:
A cutting fluid supply device for a holder with an oil hole that is smaller than the clearance of the fitting part of the mouth.