JPS6026896Y2 - Spindle device with coolant supply function - Google Patents

Description

[Detailed description of the invention] This invention operates the tool gripping mechanism provided inside the tip of the main spindle by moving the draw rod that passes through the main spindle in the axial direction, and also operates the tool gripping mechanism provided inside the tip of the main spindle. The present invention relates to a spindle device in which a flow path is formed through which coolant is supplied to a tool attached to the tip of the spindle.

When machining is performed by supplying coolant to the cutting edge of the tool from a coolant spout passage drilled in the tool to prevent tool wear and remove heat generation, it is necessary to supply coolant from the spindle side to the tool side in some way. In a machine tool having an exchange function, a flow path for supplying coolant is bored in the axis of a draw rod that passes through the main shaft in the axial direction, and coolant is supplied to the tool through this flow path.

By the way, draw rods are generally small in diameter, and the coolant flow path drilled in them is also narrow, so during long-term coolant supply, there is a risk that the flow path will become clogged with dust, making it impossible to supply coolant. be.

For this reason, in such a main shaft device, it is necessary to remove the draw rod to clean the flow path, etc. However, in the conventional main shaft device, a nut member screwed onto the rear end of the draw rod is attached. Since the rotation cannot be restrained externally, in order to detach the draw rod from the nut member and remove it in front of the main shaft, it is necessary to remove the unclamping cylinder device etc. attached to the rear of the main shaft and remove the nut member. However, there was a problem in that it took a lot of time to remove the draw rod.

The present invention has been developed in view of these conventional problems.The rotation of the nut member can be easily restrained from the outside, and the draw rod can be separated from the nut member simply by rotating the main shaft. The purpose is to allow easy removal.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 10 indicates a headstock fixed to the front surface of a slide body 11 that is movable in the vertical direction.
The main shaft 1 has a tool mounting hole 12a formed on the lower end surface.
2 is mounted rotatably around a vertical axis by bearings 13, 13.

A pulley 15 is fixed to the rear end of the main shaft 12 that projects upward from the head stock 10, and the main shaft 12 is rotationally driven by a belt in an enclosure and a drive motor.

A gripping mechanism 20 is disposed above the mounting hole 12a at the tip of the spindle, and is configured to hold a support sleeve 16, a plurality of engagement balls 17, and a gripping member 18.
It is designed to grip the grip part of.

That is, a holding hole 21 for holding the support sleeve 16 concentrically with the axis of the main shaft 12 is bored above the mounting hole 12a, and the upper end surface of this holding hole 21 and the circlip 22 allow
A support sleeve 16 is positioned and fixed.

A cylindrical gripping member 1 having an outer diameter smaller than the minimum diameter portion of the mounting holes 1 and 2a is disposed within this support sleeve 16.
8 is supported so as to be removable toward the front end side of the main shaft 12, and an engaging ball 17 is loosely fitted into a holding hole bored in the outer circumferential portion of the distal end of this gripping member 18.

The rear end of this gripping member 18 is fixed to one end of a draw rod 25 which is bored up to the rear end surface of the main shaft 12 and passes through a cylindrical hole 23 in the axial direction.

Further, a key 23 screwed onto the main shaft 12 is engaged in a key groove 18a carved in the axial direction on the outer circumferential surface of the rear end of the gripping member 18, so that the rotation of the main shaft 12 is controlled via the gripping member 18. and is transmitted to the draw rod 25.

A nut member 26 whose large diameter portion protrudes from the rear end surface of the main shaft 12 is screwed onto the rear end portion of the draw rod 25 .
There is a draw rod 2 between the washer 27 placed at the bottom of the
A disc spring 28 that applies a retracting force to 5 is contracted.

The length of the keyway 18a and the position of the key 23 are set such that the engaged state between the key 118a and the key 23 is maintained until the threaded portion of the draw rod 25 is removed from the nut member 26. is set to .

The nut member 26 has a small diameter portion protruding above the large diameter portion concentrically with the main shaft axis, and this small diameter portion passes through an unclamping cylinder 40 to be described later, and a distributor 30 is attached to the upper end thereof. Coolant is supplied from the fixed portion to a flow path 31 formed in the center of the nut member 26 in the axial direction.

The tip of this flow path 31 opens at the bottom of a screw hole 32 that is bored at the center of the lower end of the large diameter portion and is screwed into the rear end of the draw rod 25. A flow path 33 is also provided to penetrate in the axial direction.

Therefore, the coolant supplied to the flow path 31 is supplied to the inside of the gripping member 18 through the flow path 33 of the draw rod 25, and thereby the coolant is supplied to the flow path 35 of the tool T.

On the other hand, 40 is an unclamping cylinder supported above the main shaft 12 on the front surface of the slide body 11 while allowing movement only in the direction of the main shaft axis. , the main shaft 1
A cylindrical body 42 having an engaging portion 42a that can be engaged with the lower surface of a flange 12b protruding from the outer periphery of the upper end of the cylinder body 41 is fixed thereto, and a piston 43 fitted within the cylinder body 41 is fixed thereto.
The lower end of the piston rod faces the upper end surface of the large diameter portion of the nut member 26, and by supplying pressurized fluid to the upper chamber of the cylinder body 41 and lowering the piston 43, the piston rod of the piston 43 is connected to the nut member. 26, the draw rod 25 descends, and the gripping mechanism 20 becomes unclamped.

Further, an engagement hole 45 whose tip opens into the screw hole 32 is bored in the upper outer circumferential surface of the large diameter portion of the nut member 26, and a detent shaft 47 that also acts as a set screw is inserted into the engagement hole 45.
is screwed onto the cylindrical body 42, and the engagement hole 4
A locking hole 46 having a diameter larger than 5 is bored at the same position in the main shaft axis direction as the engaging hole 45.

The length of the rotation stopper shaft 47 is such that when the rotation stopper shaft 47 is loosened, the rear end shaft portion reaches the locking hole 46 before the tip threaded portion comes off from the nut member 26.

When removing the draw rod 25 in the spindle device with the above configuration, first remove the tool T from the mounting hole 12a of the spindle 12, then manually rotate the spindle 12 so that the rotation stopper shaft 47 faces the locking hole 46. let

Thereafter, a predetermined work tool is inserted through the locking hole 46, and the rotation preventing shaft 47, which has been fitted into the locking hole 45 of the nut member 26, is inserted into the locking hole 46 with the rear end shaft thereof being inserted into the locking hole 46. In this state, the main shaft 12 is manually rotated counterclockwise when viewed from below.

During this rotation, the rotation stopper shaft 47 comes into contact with the side surface of the locking hole 46, and the rotation of the nut member 26 is restricted, and the draw rod 25 is rotated counterclockwise in conjunction with the rotation of the main shaft 12. Then, the upper end of the draw rod 25 gradually comes out of the nut member 26, and finally the grip member 18 and the draw rod 25 fall downward as one.
The removal of the draw rod 25 is completed.

In addition.

In this case, if the support sleeve 16 also needs to be removed at the same time, the support sleeve 16 may be removed after the circlip 22 is removed.

When reassembling the draw rod 25 after cleaning the channel 33, etc., leave the rotation prevention shaft 47 as described above, attach the grip member 18 to the lower end of the draw rod 25, and remove the draw rod 25. The plurality of engaging balls 17 that have come off at the time are held in the holding holes of the gripping member 18 with grease, and in this state, the draw rod 25 is inserted into the main shaft 12.

Then, the draw rod 25 is raised while being rotated within a predetermined range in the rotational direction, and the key 23 is engaged in the key groove 18a of the gripping member 18.

Furthermore, after this, the draw rod 25 is moved upward,
The upper end threaded portion is brought into contact with the threaded hole 32 of the nut member 26,
In this state, the main shaft 12 is rotated clockwise when viewed from below.

As a result, the threaded portion of the draw rod 25 is attached to the nut member 2.
When the upper end surface of the draw rod 25 reaches the bottom surface of the screw hole 32, the main shaft 12 stops rotating, and the assembly of the draw rod 25 is completed.

Then, by tightening the rotation prevention shaft 47, the nut member 26 is prevented from rotating relative to the draw rod 25, and the rotation prevention member 47 is inserted into the engagement hole 46.
The main shaft 12 is allowed to rotate.

In the above embodiment, the unclamping cylinder 40 can be opened by loosening the rotation preventing shaft 47 which also serves as a set screw.
The nut member 26 was prevented from rotating by engaging the rotation preventing shaft 47 with the cylindrical body 42 fixed to the nut member 26.
Another engagement hole is drilled at a position angularly shifted from the set screw insertion position, and the tip of the detent shaft 47 inserted from the outside of the cylindrical body 42 through the locking hole 46 is held in this position. The nut member 26 may be prevented from rotating by engaging with the hole.

As described above, in the spindle device of the present invention, the outer diameter of the draw rod and the gripping member fixed to the tip thereof is formed to be smaller than the minimum diameter part of the tool mounting hole, and
Since the nut member that is screwed onto the rear end of the draw rod can be easily prevented from rotating from the outside, the draw rod can be taken out to the tip of the spindle and installed from the tip of the spindle with a simple operation. This has the advantage that draw rod cleaning work can be done easily and in a short time.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a spindle device showing an embodiment of the present invention. 10... Headstock, 2... Main spindle, 16...
...Support sleeve, 17...Engagement ball, 1
8...Gripping member, 23...Key 28
...Spring, 30...Distributor, 31.33...Flow path, 40...
... Cylinder for unclamping, 42 ... Cylindrical body, 45 ... Engagement hole, 46 ... Locking hole,
47... Rotation stopper shaft.

Claims (1)

[Scope of utility model registration request] A tool mounting hole is formed in the tip of the spindle mounted on the headstock, and a gripping member having a diameter smaller than the minimum diameter of the mounting hole grips the gripping portion of the tool mounted in the tool mounting hole. , a support sleeve that supports the gripping member so that it can be pulled out toward the tip side of the main spindle, and a support sleeve disposed inside the tip of the main spindle, and a distal end portion connected to the gripping member at least in the axial center of the main spindle with a diameter smaller than the mounting hole. A draw rod that is allowed to move only in the axial direction with respect to the main shaft is installed to penetrate in the axial direction, and a coolant is applied to the tool installed in the installation hole at the axial center of the draw rod. A supply channel is bored in the axial direction, and a nut member having at least one end protruding from the rear end surface of the main shaft is screwed to the rear end of the draw rod, and the nut member and the main shaft are connected to each other. A spring for pushing the draw rod rearward is disposed between the nut members, and an engagement portion into which a rotation preventing member can be inserted is formed on the outer peripheral surface of the end of the nut member that protrudes from the rear end surface of the main shaft. , the rotation of the nut member is restrained by engaging with the outer peripheral surface of a rotation preventing member inserted into the engaging portion of the nut member at a location where rotation around the spindle axis is restrained with respect to the headstock; A spindle device having a coolant supply function, characterized in that a locking surface is formed.