JPS6128673Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a spindle head in a vertical machining center, and specifically includes a head body that is movably disposed on the front surface of the ram, a spindle that is rotatably supported by the main body, and a spindle that is rotatably supported by the main body. This invention relates to a spindle head that is mainly composed of a tool clamp device installed in a center hole, a cylinder that pushes the draw rod of the device to unclamp the tool, and a spindle motor that drives the spindle. .

If the spindle motor of the spindle head is arranged parallel to the front side of the outer circumferential surface of the unclamping cylinder, maintenance and inspection of the unclamping cylinder must be performed by removing the spindle motor, which can be troublesome. Become. Furthermore, the amount of protrusion of the spindle head from the front surface of the ram also increases, creating a problem of inconvenience to workers and the like.

In view of the above reasons, the purpose of this invention is to facilitate maintenance and inspection of the unclamping cylinder.
Moreover, it is an object of the present invention to provide a spindle head that can reduce the amount of protrusion from the front surface of the ram.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1 showing a side view of a vertical machining center, a table 2 on which a workpiece W is set is fixed on a base 1, and a saddle 3 is movable in the left-right direction (X-axis direction) on one side of the base 1. It is arranged. A ram 4 is disposed on the upper surface of the saddle 3 so as to be movable in the front-rear direction (Y-axis direction), and a head body 6 of a spindle head 5 is disposed on the front surface of the ram 4 so as to be movable up and down. The movement of the saddle 3, ram 4, and head body 6 is performed by a ball screw mechanism 8 operated by a motor 7.

As shown in FIG. 2, a vertical main shaft 9 is rotatably supported in the head body 6, and a center hole 10 penetrates through the center of the main shaft 9 at the lower end thereof with a taper for the tool T. Tapered hole 1 into which the shaft Ta is inserted
1 is formed. Furthermore, a clamping device 12 having a steel ball for removably clamping a pull stud Tb protruding from the end surface of the tapered shaft Ta of the tool T is installed in the center hole 10.
The draw rod 13 of the second
In the figure, it is biased upward in the clamping direction, and its upper end surface protrudes from the upper end surface of the main shaft 9 by a predetermined amount.

A cylinder 15 for unclamping the tool T is disposed facing downward on the upper end surface of the head body 6, and the center of the cylinder rod 16 of the cylinder 15 is located a distance H toward the ram 4 in FIG. 2 from the center of the main shaft 9 and the draw rod 13. positioned. A push rod 18 is connected in parallel to the tip of the cylinder rod 16 via a connecting member 17. The push rod 18 is supported so as to be movable in the axial direction on the same centerline as the draw rod 13, and is biased in the backward direction (upward) by a return spring 19. A bolt-shaped pusher 18a, which faces the upper end surface of the draw rod 13 so as to be movable toward and away from the upper end surface of the draw rod 13, is screwed into the lower end surface of the push rod 18 so that the push rod 18 can move forward and backward. Further, when the cylinder rod 16 and the push rod 18 are at their rearward end positions, the upper end surface of the draw rod 13 and the pusher 1
A gap S is provided between the lower end surface of the belt 8a and the belt 31, which will be described later, to be inserted and removed.

A main shaft motor 20 for driving the main shaft 9 is close to the front side of the outer peripheral surface of the push rod 18 and is attached to the head body 6 via both first and second brackets 21 and 22. In this example,
As shown in FIG. 3, the first bracket 21 has a bolt 23 and a long hole 24 on the lower front side of the head body 6.
A hollow box-shaped second bracket 2 having a pulley chamber inside is mounted on the upper end surface of the first bracket 21 so as to be movable in the vertical direction.
2 is attached by bolts 25 and elongated holes 26 so as to be movable in the front and rear directions. Furthermore, as shown in FIG. 2, a nut member 27 is protruded from the lower surface of the second bracket 22, and an adjustment nut member 27 is screwed into the nut member 27 from the upper front surface of the first bracket 21 so that it can move forward and backward. The bolt 28 adjusts the movement of the second bracket 22 in the longitudinal direction relative to the first bracket 21. A main shaft motor 20 is mounted on the upper end surface of the second bracket 22 facing downward at a position close to the front side of the outer circumference of the aforementioned push rod 18. Output shaft 20 of this main shaft motor 20
A projects into the pulley chamber 2 of the second bracket 22, and a drive pulley 29 is keyed to this part. On the other hand, a driven pulley 30 is keyed to the shaft end of the main shaft 9, and both drive and driven pulleys 29,
A belt 31 for torque transmission is stretched between the belts 30 and 30. In addition, the lower wall 22 of the second bracket 22
A is formed with a through hole 22b into which the drive pulley 29 can be inserted and removed.
The bearing holder 32 supporting one end of the bolt 33
They are removably fitted together. Furthermore, a female thread 29a is formed in the center of the drive pulley 29 to accommodate a pulley attachment bolt (not shown) for attaching and detaching the pulley 29 to and from the output shaft 20a of the spindle motor 20.

A motor cover 34 that covers both the first and second brackets 21 and 22 and the main shaft motor 20 is removably inserted into the head body 6, and a cylinder cover 35 that covers the unclamping cylinder 15 is attached to the motor cover 34. It is removably attached to the upper end.

In the spindle head 5 configured as described above, the torque of the output shaft 20a of the spindle motor 20 is
After being transmitted to the main shaft 9 via the driving pulley 29, belt 31, and driven pulley 30, it is transmitted to the tool T by a drive key (not shown) at the tip of the main shaft 9.

When replacing the tool T, the draw rod 13 is
is pushed out against the biasing force of the spring 14, and the steel ball of the clamping device 12 moves to the unclamping position. In this state, the tool T is replaced with respect to the spindle 9.

Now, since the unclamping cylinder 15 is disposed on the upper end surface of the head body 6, this cylinder 1
5, when performing maintenance and inspection, remove the cylinder cover 35.
By removing it, the unclamping cylinder 15 is exposed from the upper end surface of the head body 6, so that maintenance and inspection of the cylinder 15 can be easily performed.

Furthermore, since the main shaft motor 20 is disposed close to the front side of the outer periphery of the push rod 18, the main shaft motor 20 is placed close to the front side of the outer periphery of the unclamping cylinder 15.
The amount of protrusion L of the spindle head 5 from the front surface of the ram 4 can be reduced compared to the case where the spindle head 5 is disposed in the front surface of the ram 4.

Further, in this embodiment, since the main shaft motor 20 is attached to the head main body 6 via both the first and second brackets 21 and 22, first, the first bracket 21 is moved and adjusted in the vertical direction. The heights of both the drive and driven pulleys 29, 30 can be adjusted, and then the tension of the belt 31 can be adjusted by moving and adjusting the second bracket 22 in the front and rear directions. Furthermore, the belt 31
When attaching, detaching, or replacing the main shaft motor 20, move the second bracket 22 backward and loosen the belt 31 by a predetermined amount.
The belt 31 can be replaced by removing it, or by removing the bearing holder 32 and removing the drive pulley 29 from the output shaft 20a of the main shaft motor 20 using the pulley removal bolt.
It is also possible to remove and replace the parts.

As mentioned above, this invention has a vertical main shaft rotatably supported on the head body which is movably disposed on the front surface of the ram of a vertical machining center.
A clamping device for removably holding the tool is installed in the center hole of the main shaft, while a cylinder for unclamping the tool is installed at the upper end of the head body, and the rod of this cylinder is attached to the clamping device. A push rod is connected to the push rod, which is movably opposed to the end face of the draw rod and which unclamps the tool by pushing the draw rod.Furthermore, a spindle motor that drives the spindle approaches the front side of the outer periphery of the push rod, and The head is attached to the head main body via both first and second brackets, the first bracket is attached to the front side of the head main body so as to be movable up and down, and the second bracket is attached to the upper end surface of the first bracket so as to be movable back and forth. Further, the main shaft motor is mounted on the upper end of the second bracket with the output shaft inserted into a pulley chamber formed inside the second bracket, and the output shaft of the main shaft motor and the A belt is stretched between both the driving and driven pulleys attached around the upper end of the main shaft, and the belt is stretched between the upper end surface of the draw rod and the pushing surface of the push rod opposite thereto. This is a spindle head in a vertical machining center that has a gap large enough to allow insertion and removal of the main shaft.

Therefore, according to this invention, since the unclamping cylinder is disposed at the upper end of the head body, maintenance and inspection of the unclamping cylinder can be performed without removing the main shaft motor. , inspection, etc. can be easily performed.

Furthermore, since the main shaft motor is arranged close to the front of the outer periphery of the push rod, the amount of protrusion of the main shaft head from the front of the ram is reduced compared to a case where the main shaft motor is arranged near the front of the outer periphery of the unclamping cylinder. be able to.

Moreover, the first bracket is attached to the head body so that it can move up and down, and the second bracket, on which the spindle motor is attached to the upper end, is attached to the upper end of the first bracket so that it can move back and forth, so the first bracket can be moved up and down. By doing so, it is possible to adjust the height of both the driving and driven pulleys that are attached to the output shaft of the motor and the main shaft that opposes it, and by moving the second bracket back and forth, the height of both the pulleys can be adjusted. The tension of the belt between the two can be easily adjusted.

Furthermore, since a gap is set between the upper end surface of the draw rod and the pushing surface of the push rod opposite thereto, the gap is large enough to allow the belt to be inserted and removed.
By retracting the bracket and loosening the belt by a predetermined amount, and removing the main shaft motor from the second bracket, the belt can be easily attached and replaced.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
2 is a side view showing a vertical machining center, FIG. 2 is an enlarged side sectional view of the spindle head, and FIG. 3 is an enlarged front view of a part of the spindle head. 1...Base, 2...Table, 3...Saddle, 4...Ram, 5...Spindle head, 6...Head body, 9...Spindle, 10...Center hole, 12...
Clamp device, 13... Draw rod, 15...
Unclamping cylinder, 16... cylinder rod, 17... connecting member, 18... push rod, 20... main shaft motor.

Claims (1)

[Scope of utility model registration request] A vertical main shaft is rotatably supported in the head body, which is movably disposed on the front surface of the ram of a vertical machining center, and a clamping device that removably holds a tool is installed in the center hole of this main shaft. On the other hand, a cylinder for unclamping the tool is disposed at the upper end of the head body, and the rod of this cylinder faces the end face of the draw rod of the clamping device so as to be able to come into contact with and separate from it, and unclamps the tool by pushing the low rod. A push rod for clamping is connected, and furthermore, a main shaft motor for driving the main shaft approaches the front outer periphery of the push rod and is attached to the head main body via both first and second brackets. is attached to the front side of the head main body so as to be movable up and down, the second bracket is attached to the upper end surface of the first bracket so as to be movable back and forth, and the upper end of the second bracket has a bracket formed therein. The main shaft motor is mounted with the output shaft inserted into the pulley chamber, and there is a gap between the output shaft of the main shaft motor and the driving and driven pulleys mounted around the upper end shaft of the main shaft opposite thereto. A spindle head in a vertical machining center, wherein a belt is stretched, and a gap is provided between the upper end surface of the draw rod and a pushing surface of a push rod opposing thereto, through which the belt can be inserted and removed. .