JPS6018277Y2 - Machine tool coolant opening/closing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coolant opening/closing device for a machine tool having a plurality of spindles.

Conventionally, in machine tools equipped with multiple spindles such as top processing machines, the coolant for each spindle is supplied by a common pump, so if one spindle is machining and the other spindle is not used, the unused spindle In order to prevent coolant from being injected in vain in response to this, the pipe is closed by operating an electromagnetic switching valve provided in the coolant supply pipe corresponding to the main shaft.

This prior art requires an electromagnetic switching valve and an associated electric circuit, and the possibility of electrical failure cannot be avoided.

The present invention was developed in view of the above circumstances, and its purpose is to provide a mechanically operated valve to open and close the coolant supply pipe, and to operate the valve by using a cap attached to the main shaft that is not used for processing. The object of the present invention is to provide a coolant opening/closing device which has a simple operating structure and is free from electrical failure.

Embodiments of the present invention will be described below with reference to the drawings.

An example of a machine tool to which the two-runt opening/closing device of the present invention is applied is a face milling machine with an automatic tool changer, in which a spindle motor and a rotating head are attached to a spindle ram that is movable up and down and mounted on a saddle that can move left and right. The rotating head is provided with a horizontal main shaft and a vertical main shaft to constitute the entire main shaft head.

The drawing is a cross-sectional view showing the coolant opening/closing device of the present invention provided with respect to this horizontal main shaft.

A similar coolant opening/closing device can also be provided for the vertical main shaft, and its illustration is omitted.

In the figure, 1 is a rotating head.

A horizontal main shaft 3 is rotatably supported in the mounting hole la of the swing head 1 via a bearing 2 and a bearing (not shown).

Further, an annular cover 4 which also serves as a bearing holder for the bearing 2 is fixed to the end face of the swing head 1 with bolts 5.

A coolant nozzle 7 is provided in the hole 4a of the cover 4 via a seat 6 so that its direction can be freely adjusted with respect to the processing surface.

A block 8 is fixed to the end surface of the cover 4.

A pipe line 8a is bored through the block 8, and a coolant supply pipe 10 is connected to the inlet side of the pipe line 8a via a pipe joint 9.

The outlet side of the pipe 8a is a pipe 4b bored in the cover 4.
It communicates with the hole 4a through.

A hole 8b is bored in the block 8 so as to intersect the conduit 8a.

A slide valve body 11 is slidably inserted into the hole 8b within a predetermined range, and the small diameter portion 12 of the slide valve body 11 is inserted into the opening 8C of the block 8 and bored into the end of the block 8. It faces into the provided notch groove 8d.

The sliding valve body 11 has a spring interposed between the sliding valve body 11 and the cover 4 in the hole 11a! 3, the small diameter portion 12 is urged toward one end of the sliding range within the hole 8b in a protruding direction.

The sliding valve body 11 is provided with an annular groove 11b that communicates with the conduit 8a of the block 8 in this normal state.

Therefore, when coolant is supplied to the supply pipe 10 in this state (arrow A in the figure), the coolant is injected from the coolant nozzle 7 toward the processing surface.

Further, when the sliding valve body 11 retreats as shown in the figure, the groove 1
1b moves to a position shifted from the pipe line 8a of the block 8, so that the coolant in the pipe line 8a is closed off by the sliding valve body 11.

8e and 8f are holes provided in the block 8 to vent air when the sliding valve body 11 slides.

When machining is performed using either one of the horizontal main shaft 3 and the vertical main shaft, the other is not used.

When machining is performed using the vertical spindle, a cap 14 is attached to the horizontal spindle 3 to particularly prevent the tool insertion hole 3a from being contaminated.

The taper shank portion 14a of the cap 14 is inserted into the tool insertion hole 3a of the horizontal main shaft 3 in the same way as a general tool, and a pull stud (not shown) provided at the rear is locked, so that the cap 14 is inserted into the horizontal main shaft 3. be clamped.

When machining is performed using the horizontal spindle 3, the cap 14 can be attached to the vertical spindle by gripping the gripping portion 14b with an automatic tool changer, and when not in use, it can be stored in a tool magazine along with other tools by the automatic tool changer. It is possible.

15 is fixed to the horizontal main shaft 3 and is inserted into the notch 14 of the cap 14.
It is a detent that engages with c.

The cap 14 is provided with the following structure as an operating means 16 for the sliding valve body 11.

A shaft 18 is rotatably supported relative to the cap 14 through bearings 17, 17 in a hole 14d formed in the center of the end of the cap 14.

Reference numeral 19 denotes a bearing retainer fixed to the cap 14 by a port 20.

A flange portion 18a provided on the shaft 18 is connected to both the bearings 17, 1.
It is clamped between 7 and is stopped from being pulled out.

A base end of an arm 21 is secured to the end of the shaft 18 with a bolt 22, and a spacer 23 is interposed between the arm 21 and the bearing 17, which also serves as a bearing holder.

A block 24 is fixed near the tip of the arm 21 so as to face the block 8 with a slight gap therebetween.

A hole 24a is bored in the block 24, and a slider 25 is slidably inserted into the hole 24a within a predetermined range, and the small diameter portion 26 of the slider 25 is inserted into the opening 24b of the block 24. It faces the outside of the block 24.

The slider 25 has its hole 25a and the hole 21 of the arm 21.
A spring 27 interposed between the slider 25 and the arm 21 in the hole 24a biases the small diameter portion 26 toward one end of the sliding range in the hole 24a in a protruding direction.

A pin 28 is installed in the side wall of the slider 25.
8 is a slider 25 provided on the side wall of the block 24.
The pin 28 extends toward the cap 14 through a hole 24c that allows the pin 28 to move as the pin 28 slides.

The pin 28 is inserted into the notch 14e of the cap 14 when the slider 25 assumes a position biased by the spring 27 when the cap 14 is not attached to the main shaft.
It engages to prevent rotation.

Further, when the cap 14 is attached to the horizontal main shaft 3, the small diameter portion 26 collides with the small diameter portion 12 of the sliding valve body 11, and the double diameter portion 26.12 assumes the retracted position as shown in the figure. The tip of the portion 26 is the notch groove 8d of the book recess 8.
The pin 28 disengages the notch 14e of the cap 14 so that the cap 14 can rotate together with the horizontal main shaft 3 relative to the arm 21. .

Reference numeral 21b is a hole provided in the arm 21 for sliding the slider 25 in and out.

The coolant opening/closing device of the present invention has the above-described configuration, and a valve operating means is provided on the cap that is attached to the thin main spindle during processing by one of the plurality of main spindles, and the cap is attached and detached. Since the valve in the coolant supply pipe is automatically closed mechanically in conjunction, there is no needless spraying of coolant when the spindle is not being machined, which reduces the use of coolant and prevents contamination near the spindle. I can do it.

Also, there is no need for solenoid valves or related electrical circuit configurations.
Therefore, there is no fear of electrical failure.

Furthermore, since there is no need to operate the valve in addition to the cap mounting operation as in the conventional case, the machining time is not extended.

Note that the present invention is not limited to the illustrated embodiment, and can be modified within the scope of the gist described in the claims of the utility model registration.

For example, if one of the main shafts of the machine tool does not rotate, the valve operating means may be provided in such a manner that it does not rotate relative to the cap.

[Brief explanation of the drawing]

The drawings are cross-sectional views showing embodiments of the present invention. 1...Swivel head, 3...Horizontal main shaft, 4
b, 8a...Pipe line, 11...Sliding valve body, 14...Cap, 16...Valve operating means, 21... Arm, 25...Slider.

Claims (1)

[Scope of utility model registration request] In a machine tool that is equipped with multiple spindles and when some of the spindles are used, a cap is attached to the spindle end of the spindle that is not used. An operating means is provided in the middle of the coolant supply pipe provided in the main spindle head, and when the cap is attached to the main shaft corresponding to the supply pipe, the valve is pushed by the valve operating means of the cap to close the valve. A coolant opening/closing device for a machine tool, characterized in that a sliding valve element is interposed that assumes an open state when the cap is removed from the main shaft.