JP3108053B2 - 2-spindle machining center - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining center having two spindles.

[0002]

2. Description of the Related Art One-spindle machining center

[0003]

A machining center like the above-mentioned prior art is widely used because of its versatility and is suitable for small-lot production of many types. In order to reduce the idle time, the number of units must be increased in order to reduce the idle time.To deal with this, the replacement time and the speed of the main shaft rotation are measured, but the drive horsepower is increased. Manufacturing costs increase.

An object of the present invention is to solve the above-mentioned problem by providing a machining center for eliminating idle time.

[0005]

A two-axis machining center for achieving the above object is provided with a main shaft column and an auxiliary column which are erected on a machine stand and slide on the machine stand together in the left-right direction. The main spindle column is provided with two main shafts, which slide vertically in the vertical direction, each of which slides back and forth in the direction of the workpiece, and which are rotated by a drive motor and whose tips can be detached from the tool. The auxiliary column moves in accordance with the vertical and horizontal movements of the two spindles, and can be moved up and down between the two spindles, during machining of one of the two spindles. In addition, one automatic tool changer that shifts to the other spindle that is not being machined and exchanges a tool mounted on the spindle with a desired tool, and one tool magazine that stores a plurality of tools are provided. Things.

[0006]

According to the present invention, one automatic tool changer and one tool magazine mount a tool on the other spindle while machining with one of the two spindles arranged side by side in the vertical direction. In addition to the fact that the so-called idle time is reduced to zero and the productivity is high, the two spindles are arranged vertically in one column erected on the machine base. Considering the gate-shaped beam configuration in the above, since the machine width is narrowed, the line can be shortened in line-up, leading to a reduction in equipment costs.

[0007]

1 shows an embodiment of a two-axis machining center according to the present invention. FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a sectional view taken along line XX 'of FIG. 1, and FIG. The following is a description with reference to the side views of FIGS.

[0008] In the figure, reference symbol M indicates a machining center,
The machining center M includes a machine base 1, a main spindle column 2 disposed on the machine base 1, and an auxiliary column 3. The machine base 1 is provided with a slider 4 in a left-right direction when viewed from the front and a servo. A ball screw 6 rotated by a motor 5 is disposed in parallel with the slider 4. The slider 4 is screwed to the ball screw 6, and the sliding base 8 slides on the slider 4 in the left and right direction by the rotation of the ball screw 6. The spindle column 2 is provided on one side of the sliding base 8 and the auxiliary column 3 is provided on the other side, and a rotary indexing table 7 for setting a workpiece is provided in the front. I do.

The main spindle column 2 is provided with a vertical slider 9 on the opposite side of the auxiliary column 3, and a ball screw 11 rotated by a servo motor 10 standing vertically on the main spindle column 2 in parallel with the slider 9. Hanging down,
A sliding plate 12 which is screwed into the ball screw 11 and slides up and down along the slider 9 by the rotation of the ball screw 11 is slidably fitted on the slider 9. Sliders 13, 13 'extending in the front-rear direction, that is, in the direction of the workpiece, are provided side by side at upper and lower positions on the opposite side, and ball screws 14, 14' parallel to the respective sliders 13, 13 'are provided. A servo motor 1 for rotating each of the ball screws 14 and 14 '
5 and 15 'are provided, and the respective sliders 13 and 13' are screwed into the respective ball screws 14 and 14 'rotated by the respective servo motors 15 and 15', and the respective spindle heads 16 and 16 'move forward and backward. And each spindle head 16, 1
In the front of 6 ', the main shaft 17, 1 whose tip is removable
7 ′, and drive motors 18 and 18 ′ for rotating the spindle in the rear.
Is provided.

The auxiliary column 3 has a support frame 19
And a servomotor 20 that rotates synchronously with the servomotor 10 for vertically moving the main shafts 17 and 17 ′ is disposed upward, and a ball screw 22 having a spline shaft 21 connected to the end thereof is vertically provided to drop the spline. A tip end portion of the shaft 21 is inserted into a timing pulley 23 rotatably supported by the support frame 19, and a timing belt 20 b is hung on the timing pulley 23 and the timing pulley 20 a fixed to the shaft of the servomotor 20. At the upper end of the ball screw 22, there is provided a bearing 24 which rotatably encloses the ball screw 22 and further has a laterally elongated cam groove 24a on the side. 25, and a rack is provided by the hydraulic cylinder 25.
A crank arm 27 is fixed to a shaft 26 that rotates via a pinion (not shown), and a main shaft 1 having a diameter of a rotation locus about the shaft 26 arranged in the longitudinal direction is attached to the crank arm 27.
At a portion corresponding to the distance between 7, 17 ', there is provided a trochanter 27a which fits in the horizontally long cam groove 24a of the support body 24. Further, a slider 2 provided on the side of the auxiliary column 3 in the vertical direction.
8 are connected to the main shafts 17, 17 connected via stays 29.
The tool magazine 31 storing a plurality of tools and the automatic tool changer 30 adjacent to the '′ are slidably fitted to each other, and the ball screw 22 is rotated via the female screw body 32 so as to be vertically slidable along the slider 28, The automatic tool changer 30 includes:
In an original position (FIG. 2) where each of the spindles 17 and 17 'is retracted, a change arm 33 for exchanging a desired tool T in a tool magazine 31 adjacent to a tool T mounted on any one of the spindles 17 and 17'. A drive source 34 is provided for the front and rear rotation exchange operation of an exchange arm 33. Each of the ball screws 1 is driven by the synchronously rotating servo motors 10 and 20.
The exchange arm 33 and the tool magazine 31 via the first and second 22
Is constantly moved up and down with one of the vertically arranged spindles 17 and 17 ′ in a horizontal isotope sequence, and the rotation of the crank arm 27 causes the support body 24 to move upward and downward.
The ball screw 22 is connected to the main shaft 1 through the horizontally long cam groove 24a.
It moves up and down the distance between 7, 17 '. It should be noted that each of the ball screws 1 does not depend on the synchronous rotation of the servomotors 10 and 20 or the diameter ratio of the timing pulleys 20a and 23.
It suffices if 1, 2 rotate synchronously.

Thus, the automatic tool changer 30 and the tool magazine 31, and the lower spindle 17 'of the horizontal isotope row (FIG. 1)
After a desired tool T among a plurality of tools stored in the tool magazine 31 is mounted by the exchange arm 33, the main shaft 17 ′ is rotated by the drive motor 18 ′, and the right and left The servo motor 1 accompanying the shift of the sliding board 12 which moves up and down through the ball screw 11 by the moving sliding base 8 and the servo motor 10
5 'through the ball screw 14' and the lower spindle 17 '
And the tool spindle 31 'is moved forward to process a desired portion of the workpiece set on the rotary indexing table 7. The automatic tool changer 30 and the tool magazine 31 are related to the shift of the lower spindle 17'. Left and right movement of the sliding base 8,
The automatic tool changer is moved up and down by a servomotor 20 which rotates synchronously with the servomotor 10 via a ball screw 22 and always moves with the right and left and up and down movement of the lower spindle 17 ′. The tool magazine 31 and the tool magazine 31 are raised by the ball screw 22 which moves up and down via the crank arm 27 and the support body 24, and the tool magazine 31 is moved by the exchange arm 33 as a horizontal isotope row with the upper spindle 17 existing at the original position during non-machining. A desired tool for the next machining is mounted on the upper spindle 17 from the lower spindle 17 '.
In response to the retreat to the original position due to the end of machining, the upper spindle 17 processes a desired portion of the workpiece by the same transition as described above. During the machining, the automatic tool changer 30 and the tool magazine are used. Numeral 31 is shifted to the lower spindle 17 'again to exchange the finished tool with the next machining tool. This is repeated to machine the workpiece.

According to the above, the automatic tool changer and the tool magazine always move in the same direction as one of the main spindles arranged in the vertical direction, and move up and down between the main spindles to perform machining by one of the main spindles. Since the tool can be mounted on the other spindle at the same time, so-called idle time is zero and the productivity is high. In addition, since both spindles are vertically arranged in one column standing on the machine base, for example, 2 Considering the portal-shaped beam configuration in the case where the main shafts are arranged side by side in the horizontal direction, the width of the machine becomes narrower, so that the line can be shortened in line-up, leading to a reduction in equipment cost.

[Brief description of the drawings]

FIG. 1 is a front view.

FIG. 2 is a plan view.

FIG. 3 is a sectional view taken along line XX ′ of FIG. 1;

FIG. 4 is a side view of a crank portion.

[Explanation of symbols]

 1 Machine stand 2 Spindle column 3 Auxiliary column 5 Servo motor 8 Sliding base 10 Servo motor 11 Ball screw 12 Sliding board 15, 15 'Servo motor 16, 16' Spindle head 17, 17 'Spindle 18, 18' Drive motor 20 Servo Motor 21 Spline shaft 22 Ball screw 24 Bearing 24a Horizontal cam groove 27 Crank arm 30 Automatic tool changer 31 Tool magazine 33 Replacement arm M Machining center T Tool

Claims (1)

(57) [Claims] 1. A main shaft column and an auxiliary column which are erected on a machine stand and slide on the machine stand in the left-right direction. ,
Moreover, two spindles each of which slides back and forth in the direction of the workpiece and which are rotated by a drive motor and whose tip is detachable with a tool are arranged in parallel in the vertical direction. While moving corresponding to the left-right movement, it is possible to move up and down between the two spindles, and during processing of one of the two spindles, shifts to the other spindle that is not being machined, and moves to the other spindle. A two-spindle machining center comprising one automatic tool changer for exchanging a mounted tool and a desired tool and one tool magazine for storing a plurality of tools.