JPH10216996A - Punch press provided with bottom dead center position adjustment device for striking element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely control the bottom dead center position of a striking element in a mechanical punch press arranged with plural tools on plural loci on a round or fan shape upper tool holder. SOLUTION: In this punch press 1, in which plural upper tools 19 are mounted on plural loci of a tool holder, a bottom dead center position adjustment device 17, which adjusts a bottom dead center position of a striking piece 15 striking an upper tool, is arranged to an under side of a ram 13 arranged elevatable to a frame of the punch press 1, the striking piece 15 arranged to the bottom dead center position adjustment device 17 is arranged freely to be positioned to an upper position of the upper tool on plural loci of the tool holder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch press provided with a device for adjusting the position of a bottom dead center of a striker. More specifically, the present invention relates to a bottom dead center position adjusting device for a striker of a mechanical punch press in which a plurality of upper tools are mounted on a plurality of tracks on a circular or fan-shaped tool holder and a ram is driven by mechanical means. .

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 3-101399 discloses a technique of a striker (corresponding to a striker of the present invention) provided at a ram of a press machine using a crank mechanism, and a technique of adjusting a bottom dead center position. . In this bottom dead center position adjusting device, a ram is provided on a frame of a press machine so as to be able to move up and down, and a holder holding a striker is provided on the ram. The holder is provided with a position adjusting mechanism capable of adjusting the position of the bottom dead center of the striker in the moving direction of the ram. An outline of this position adjusting mechanism is that a swash plate cam having a lower surface formed on a slope is rotatably provided by a servo motor between the holder and the striker holding the striker movably in a vertical direction, and the swash plate cam is servo-controlled. The bottom dead center position of the striker is adjusted by appropriately rotating the motor. Separately, a screw provided at the upper end of the striker is screwed into the lower surface of the ram of the press machine using the crank mechanism, and the striker is rotated by a servomotor to set the bottom dead center position of the striker. Methods of adjusting are also known. In addition, for detecting the bottom dead center position in the above both bottom dead center position adjusting devices, it is common to use a method of detecting the number of revolutions of the motor using an incremental type pulse encoder or the like.

[0003]

However, in any of the above-described bottom dead center position adjusting devices, the striker cannot be moved and positioned in a horizontal direction, so that a plurality of tracks on a circular or fan-shaped tool holder are not provided. When used as a striker (striker) in a punch press equipped with a plurality of upper tools, there is a problem that the bottom dead center position can be adjusted only for the upper tool on the central track. Also, in the conventional bottom dead center position adjusting device using an incremental type pulse encoder, the bottom dead center position is controlled only by the rotation speed of the servo motor, so that, for example, the accurate required for molding processing is required. When adjusting the bottom dead center position, the actual position of the striker ahead of the motor cannot be accurately detected, so that there is a problem that fine adjustment is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a mechanical device in which a plurality of upper tools are mounted on a plurality of tracks on a circular or fan-shaped tool holder. An object of the present invention is to provide a punch press provided with a bottom dead center position adjusting device capable of accurately controlling the bottom dead center of a striker in a punch press.

[0005]

According to a first aspect of the present invention, there is provided a punch press provided with a bottom dead center position adjusting device according to the first aspect of the present invention. In a punch press equipped with a tool, a bottom dead center position adjusting device for adjusting a bottom dead center position of a striker for hitting the upper tool is provided below a ram provided to be able to move up and down on an upper frame of the punch press, The gist of the invention is that a striker provided in the bottom dead center position adjusting device is provided so as to be freely positioned above an upper tool on a plurality of tracks of the tool holder.

According to a second aspect of the present invention, there is provided a punch press provided with a lower dead center position adjusting device for a striker, wherein the lower dead center position adjusting device is capable of moving a slide in a horizontal direction. When a slide guide is fixed to the lower side of the ram, a vertical screw hole is provided in the slide, and the slide is relatively non-rotatably engaged with a striker screwed into the screw hole. At the same time, a spline shaft provided with a worm wheel having a central shaft movably engaged in the up-down direction, a worm screwed to the worm wheel is rotatably provided on the slide, and the worm is provided extending from the rotation shaft of the worm. Provide a spline nut member that engages with
The gist is that a servo motor for driving the spline nut member is provided on the slide guide, and positioning means for moving the slide to move and move the striker to an arbitrary position above the upper tool is provided. Things.

Therefore, the striker can be positioned on the plurality of upper tools on the plurality of tracks of the tool holder, and the position of the bottom dead center of the striker can be adjusted. The dead center position can be adjusted.

According to a third aspect of the present invention, there is provided a punch press provided with a lower dead center position adjusting device for a striker, wherein a speed reduction mechanism for reducing the number of rotations of the servomotor by a gear train is provided. An origin position detecting gear that is decelerated to approximately one rotation while the striker moves from the origin position to the slide to the maximum adjustment range, and a current position where the rotation speed of the servo motor is appropriately reduced to the rotation speed. A detection gear, a first sensor for detecting the number of rotations of the current position detection gear, and a second sensor for detecting the rotation start position and the end point position of the origin position detection gear,
The gist of the invention is to provide a position detecting device for detecting the origin position and the maximum adjustment range position of the striker with the second sensor and detecting the current position of the striker with the first sensor.

Therefore, in a mechanical punch press in which a plurality of upper tools are mounted on a plurality of tracks on an upper tool holder, the actual position of the striker ahead of the motor is detected by a mechanical deceleration mechanism and the lower part of the striker is detected. The dead center position can be feedback-controlled.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a turret punch press 1 equipped with a device for adjusting the position of the bottom dead center of a punch press according to the present invention.

As shown in FIG. 1, the turret punch press 1 has side frames 5, 7 standing on both sides of a lower frame 3, and an upper frame 9 is provided above the side frames 5, 7. A crankshaft 11 serving as a mechanical vertical moving means is provided at a substantially central portion of the upper frame 9.
A ram 13 that moves up and down is provided. This ram 13
At the lower end of the upper part, an upper tool (punch) 19 (A,
A bottom dead center position adjusting device 17 that adjusts the bottom dead center position of a striker (striker) 15 that hits B and C) is provided.

Below the upper frame 9, an upper turret 21 as an upper tool holder holding a plurality of upper tools (punches) 19 in a detachable manner is provided.
Are rotatably held by a rotating shaft 23. On the lower frame 3, a lower turret 27 serving as a lower tool holder which detachably holds a lower tool (die) 25 facing the upper turret 21 and forming a pair with the plurality of upper tools (punches) 19 is rotated. It is rotatably supported on a shaft 29.

The upper tool (punch) 19 and the lower tool (die) 25 are provided at appropriate intervals on three circular orbits having different radii about the rotation axes of the upper turret 21 and the lower turret 27. There are multiple sets. The upper tool (punch) 19A is placed on the outermost track of the upper turret 21.
Is mounted on the center track, and 19C is mounted on the innermost track.

The upper turret 21 and the lower turret 27
Are rotationally driven synchronously by a servo motor (not shown) provided in the side frame. Therefore, the desired upper tool (punch) 19 and lower tool (die) 25 can be selectively positioned below the striker (striker) 15 during punching.

Referring to FIGS. 1 and 2, a pair of guide rails 31 are provided on both upper sides of the lower frame 3 along the Y-axis direction (left and right directions in FIGS. 1 and 2).
Is provided. A movable table 35 disposed on both sides of a fixed table 33 provided on the upper part of the lower frame 3 is movably supported on the guide rail 31. Also,
The moving table 35 is integrally fixed to a Y-axis carriage 37 extending in the X-axis direction (vertical direction in FIG. 2) while straddling the fixed table.

On the Y-axis carriage 37, there is provided an X-axis carriage 39 movable in the X-axis direction orthogonal to the moving direction of the moving table 35. The X-axis carriage 39 is provided so as to be driven in the X-axis direction by an X-axis servomotor 45 provided on the Y-axis carriage 37 via a drive mechanism (not shown) including a ball screw and a ball nut. A work clamp 41 for clamping one end of the plate-shaped work W is mounted on the X-axis carriage 39. In addition, the Y-axis carriage 37
Y-axis servo motor 43 provided on the side frame 7
, So that it can be driven in the Y-axis direction via a drive mechanism including a ball screw 44 and a ball nut 46.

In the above configuration, the positioning of the work W is performed by controlling the X-axis servomotor 45 and the Y-axis servomotor 43 for driving the Y-axis carriage 37 and the X-axis carriage 39 under the control of an NC device (not shown). By rotating and driving, the desired processed portion of the work W is positioned between the upper tool (punch) 19 and the lower tool (die) 25 selectively positioned below the striker (striker) 15. be able to.

As shown in FIG. 3, the upper frame 9 is provided with a ram guide 47 for guiding the ram 13 up and down. A bottom dead center position adjusting device 17 for adjusting the bottom dead center position of the striker 15 is attached to the lower end of the ram 13.

The lower dead center position adjusting device 17 will be described with reference to FIGS. The bottom dead center position adjusting device 17 adjusts the position of the striker (striker) 15 in the vertical direction with respect to the lower surface of the ram, and a plurality of orbits (three orbits in this embodiment) of the upper turret 21.
The striker (striker) 15 has a function of selectively changing the position of the striker (striker) 15 with respect to the upper tool 19 mounted on the ram 13. A slide guide 51 for guiding the slide 49 in the horizontal direction is provided on the lower surface of the ram 13 by appropriate means. , For example, with a fastening member (not shown) such as a bolt.

At approximately the center of the slide 49, a screw hole 53 is provided parallel to the moving direction of the ram 13, that is, in the present embodiment, in the vertical direction. A male screw portion 55 provided in the portion is rotatably screwed. The lower end of the striker 15 is formed to have a slightly smaller diameter than the male screw 55,
9 so as to protrude therefrom. The slide 49 has an annular hole 57 provided coaxially with the screw hole 53, and a worm wheel 59 is provided in the annular hole 57.
Are rotatably provided via bearings 61 and 62.

The center shaft 67 of the worm wheel 59 and the striker 15 are connected so as to be relatively non-rotatable and movable in the vertical direction. As such a connecting means, for example, the central shaft 67 of the worm wheel 59 is used.
A spline 69 is formed on the striking element 15 and a spline hole 65 that engages with the spline is provided in the striker 15, so that the connecting means as described above can be achieved. The striker 15
A groove 63 is provided in the axial center portion of the shaft, and an engaging member 71 that engages with the groove 63 is integrally attached by a fastening means such as a “screw” (not shown). Further, it is desirable to use trapezoidal screws capable of withstanding a large load for the “screw” provided on the striker 15 and the slide 49.

As shown in FIG. 4, the slide 4
A worm 73 that meshes with the worm wheel 59 is rotatably provided on one side of the ninth side, that is, on the left side of the turret 21 in the present embodiment toward the center of the turret 21. The rotation shaft 75 is provided in parallel with the center direction of the turret 21,
Are rotatably supported by bearings 77A and 77B provided in the above. Further, the rotating shaft 75 is provided so as to extend further away from the upper turret 21 than the bearing 75 </ b> B, and the extending portion is a spline shaft 79. A spline nut member 81 is spline-engaged with the spline shaft 79. The spline nut member 81 is rotatably mounted on a bearing 85 in a bearing housing 83 provided integrally with the slide guide 51. It is supported.

On one side of the side of the slide guide 51, in the present embodiment, on the left side of the turret 21, a servomotor 87 is provided.
Attached to a motor bracket 89 provided at A drive pulley 93 for the toothed belt 91 is provided on the output shaft of the servomotor 87, and a driven pulley 95 is fixed to the spline nut member 81. A toothed belt 91 is looped between the driving pulley 93 and the driven pulley 95.

In the above configuration, the worm wheel 59 is rotated in the appropriate rotation direction by rotating the servo motor 87 in the appropriate rotation direction under the control of an NC device (not shown) to rotate the worm wheel 59 in the appropriate rotation direction. Can only be rotated. By rotating the worm wheel 59, the striker 15 is simultaneously rotated, so that the striker 15 moves up and down according to the pitch of the male screw portion 55 provided on the outer diameter of the striker 15.
That is, the position of the lower end of the striker 15 with respect to the ram 13 can be appropriately adjusted.

A first cylinder 99 having the first piston rod 97 is fixed by a bracket 101 to a right end near the turret 21 on the other side of the slide guide 51. The second cylinder 105 having the second piston rod 103 is
It is attached to the end of the slide 49 (on the side remote from the turret) via a. Further, the first piston rod 97 and the distal end and the distal end of the second piston rod 103 are integrated by a connecting member 109.

With the above configuration, the first piston rod 97
And the second piston rod 103 protrude from the first and second cylinders 99 and 105, and the striker 15 is located above the upper tool (punch) 19A mounted on the outermost track of the turret 21. Position, and only the first piston rod 97 is connected to the second cylinder 10.
5, the striker 15 has an upper tool (punch) 19 mounted on the center track of the turret 21.
B, and when both the first and second piston rods 97 and 103 are immersed in the first and second cylinders 99 and 105, the striker 15 is moved to the innermost position of the turret 21. It will be positioned above the upper tool (punch) 19C mounted on the track.

The first and second cylinders 99, 1
When the first and second cylinders 99 and 105 are operated as described above with the strokes of the piston rods 97 and 103 of the 05, the striker 15 is moved to the upper tool (punch) 19 (A,
B and C) are set in advance so as to be positioned above. The slide guide 51 is provided with a groove 111 through which the bracket 107 can pass.

On the left side of the slide guide 51, for example, three position sensors 113 (such as proximity switches) for detecting the above-mentioned three moving positions of the slide 49 and detecting the positioning position of the striker are provided. A, B, and C) are provided at appropriate intervals.

The above three position sensors 113 (A,
When all of the slides 49 are detected by B and C), the position of the striker 15 is at a position above the outermost upper tool (punch) 19A, and the position sensor 113 (A,
When B) detects the slide 49, the striker 15 is located at a position above the central upper tool (punch) 19B, and only the position sensor 113A detects the slide 4.
When the position sensor 9 is detected, three position sensors 113 (A, B, C) are provided so that it can be determined that the position of the striker 15 is located above the innermost upper tool (punch) 19C.
Is arranged.

In the bottom dead center position adjusting device 17 as described above, the position of the lower end portion of the striker 15 with respect to the ram 13 of the striker 15 can be appropriately adjusted, and the position of the lower turret 21 on the three tracks can be adjusted. It can be positioned at a position above an arbitrary upper tool (punch) 19 in the mounted upper tool (punch) 19 (A, B, C).

FIGS. 6 and 7 show a position detecting device 120 for detecting the position of the striker 15 and the servo motor 8.
7 shows a form provided on the output shaft 7. The position detection device 120 includes a reduction mechanism including a plurality of gear trains for reducing the rotation speed of the output shaft of the servomotor 87;
It comprises first and second sensors 121 (A, B) such as proximity switches for detecting the rotational position of a specific gear that has been decelerated.

A gear box 123 is provided on the motor bracket 89, and a reduction mechanism including a plurality of gear trains is provided in the gear box 123. Gear box 12
A current position detection gear 127 for detecting the current position of the striker 15 with respect to the slide 49 is provided on a rotary shaft 125 rotatably supported at both ends of the shaft 3.
The servo motor 87 is connected to the current position detection gear 127.
The gear is engaged with the small gear 129 provided on the output shaft of (1) to perform appropriate deceleration.

Further, the small gear 131 provided on the rotating shaft 125 and the large gear 135 provided on the rotating shaft 133 rotatably supported by the gear box 123 are further engaged to reduce the speed. Also, this rotating shaft 13
3 is engaged with an origin position detection gear 141 provided on a rotating shaft 139 whose both ends of a shaft are rotatably supported by a gear box 123 to reduce the speed of the final stage.

The rotation shaft 133 is provided on the same axis as the output shaft of the servomotor 87, and the small gear 1
29, a rotating shaft 143 is provided extending from the rotating shaft 1.
43 is rotatably supported on the large gear 135. Therefore, the large gear 135 is supported by the rotating shaft 143 and is stabilized.

In the speed reduction mechanism composed of a gear train as described above, the current position detection gear 127 for performing the first-stage speed reduction.
Is provided with a first sensor 121A such as a proximity switch for detecting the rotation speed of the current position detection gear 127. In the first-stage deceleration, the current position detection gear 127 is provided so as to make at least several tens of rotations while the striker moves from the origin position with respect to the slide to the maximum adjustment range. Also, the current position detection gear 12
7 is on the side of the gear facing the first sensor 121A,
In order to operate the first sensor 121A, one or more sensor reaction units 145, such as concave portions or convex portions, which respond to the sensors are provided at equal intervals on a circular orbit facing the first sensor 121A. In order to detect the origin position of the striker 15 with the second sensor 121B also on the origin position detection gear 141 at the last stage, the current position detection gear 127 is used.
A sensor reaction unit 147 similar to that described above is provided. Note that the origin indicates the uppermost position of the striker (striker) 15 in the adjustment range of the slide 49.

The reduction ratio of the origin position detection gear 141 is
When the servo motor 87 is driven to rotate to drive the small gear 129 to adjust the position of the bottom dead center of the striker (striker) 15, the striker is moved within a preset maximum adjustment range of the striker 15. The origin position detection gear 141 is set so as to make substantially one rotation while moving from the origin position with respect to the slide 49 to the maximum adjustment range.
In addition, the sensor reaction unit 145 and the sensor reaction unit 147 provided on the current position detection gear 127 and the origin position detection gear 141 are located at positions facing the second sensor 121B when the striker (striker) 15 is located at the origin. It is provided to be.

In the case where the position of the bottom dead center of the striker (striker) 15 is adjusted by rotating the servomotor 87 by the position detecting device 120 having the above-described structure, the striker (striker) 15 is moved to the start point ( (Origin), both the first sensor 121A and the second sensor 121B are located at positions facing the sensor reaction units 145 and 147 of the current position detection gear 127 and the origin position detection gear 141, so that the first and second sensors 2 sensors 121
When the signals detected in both the sensor reaction units 145 and 147 of A and B, for example, “1” is output as a digital signal, it is mechanically detected that the striker 15 is at the origin position by the reduction mechanism by the gear train. can do.

When the servomotor 87 is driven to rotate and the striker 15 is adjusted to the lower position, a plurality of digital signals "1" are detected from the first sensor 121A facing the current position detection gear 127, and the origin position is determined. Since the digital signal “0” is detected from the second sensor 121B facing the detection gear 141, an NC device (not shown)
By taking the logical product of these two signals, it is possible to detect that the striker 15 is not at the origin position. Also, the first sensor 1
Counters detect pulses detected from 21A (not shown)
The current position of the striker 15 can be accurately detected. Note that the current position detection gear 127 need not be the first-stage reduction gear.

[0039]

According to the first or second aspect of the present invention, the striker can be positioned on the plurality of upper tools on the plurality of tracks of the tool holder, and the lower dead center of the striker can be positioned. Since the position can be adjusted accurately, for example, at the time of molding, it is possible to precisely adjust the position of the bottom dead center of the upper tool, so that accurate molding can be performed. .

According to the third aspect of the present invention, in a mechanical punch press in which a plurality of tools are mounted on a plurality of tracks on an upper tool holder, the actual position of a striker ahead of the motor is determined by a mechanical deceleration mechanism. Thus, the position of the bottom dead center of the striker can be accurately detected and detected.

[Brief description of the drawings]

FIG. 1 is a front view of a punch press provided with a bottom dead center position adjusting device of a striker according to the present invention.

FIG. 2 is a plan view taken along the line II-II in FIG.

FIG. 3A is a view taken in the direction of arrow A in FIG. 1, FIG.
FIG. 3B is a diagram showing the operation state of FIG.

FIG. 4A is a view taken along line IV-IV in FIG. 3B. FIG. 4B is a diagram showing an operation state of FIG. 4A.

FIG. 5 is a sectional view taken along the line VV in FIG. 3 (b).

FIG. 6 is a diagram in which a position detecting device for detecting the position of the bottom dead center of the striker is mounted on the punch press provided with the bottom dead center position adjusting device shown in FIG. 1;

FIG. 7 is a partial cross-sectional view along the line VII-VII in FIG. 6;

[Explanation of symbols]

 Reference Signs List 1 turret punch press 3 lower frame 5, 7 side frame 9 upper frame 11 crankshaft 13 ram 15 striker (striker) 17 bottom dead center position adjusting device 19 upper tool (punch) 21 upper turret 23 rotating shaft 25 lower tool (die) ) 27 Lower turret 29 Rotating axis 31 Guide rail 33 Fixed table 35 Moving table 37 Y-axis carriage 39 X-axis carriage 41 Work clamp 43 Y-axis servomotor 45 X-axis servomotor 47 Ram guide 49 Slide 51 Slide guide 53 Screw hole 55 Male screw Part 57 annular hole 59 worm wheel 61, 62 bearing 63 groove 65 spline hole 67 center shaft 69 spline 71 engagement member 73 worm 75 rotation shaft 77 (A, B) bearing 79 spline 81 Spline nut member 83 Bearing housing 85 Bearing 87 Servo motor 89 Motor bracket 91 Toothed belt 93 Drive pulley 95 Follower pulley 97 First piston rod 99 First cylinder 101 Bracket 103 Second piston rod 105 Second cylinder 107 Bracket 109 Connecting member 111 Groove 113 (A, B, C) Position Sensor 120 Position Detector 121 (A, B) First and Second Sensors 123 Gear Box 125, 133, 139, 143 Rotation Axis 127 Current Position Detection Gear 129, 131, 137 Small gear 135 Large gear 141 Origin detection gear 145, 147 Sensor reaction unit

Claims (3)

[Claims] 1. A punch press in which a plurality of upper tools are mounted on a plurality of tracks of a tool holder, a lower part of a ram provided on an upper frame of the punch press such that the upper tool can be moved up and down. A bottom dead center position adjusting device for adjusting a dead center position is provided, and a striker provided in the bottom dead center position adjusting device is provided so as to be freely positioned above an upper tool on a plurality of tracks of the tool holder. A punch press equipped with a bottom-dead-center position adjusting device for a striker. 2. The apparatus according to claim 1, wherein the bottom dead center position adjusting device is provided with a slide guide for guiding the slide so as to be movable in a horizontal direction, fixed below the ram, and provided with a vertical screw hole in the slide. A worm wheel having a center shaft engaged with the striker screwed into the screw hole relatively non-rotatably and simultaneously movably in the vertical direction is provided, and a worm screwed to the worm wheel is provided. A spline nut member is provided rotatably on the slide, and is engaged with a spline shaft provided extending from a rotation axis of the worm. A servomotor for driving the spline nut member is provided on the slide guide, and the slide guide is provided. And a positioning means for moving and moving the striker to an arbitrary position above the upper tool. A punch press equipped with the bottom dead center position adjusting device according to the above described striker. 3. A speed reduction mechanism for reducing the number of rotations of the servo motor by a gear train, wherein the speed reduction mechanism is decelerated to substantially one rotation while the striker moves from an origin position with respect to the slide to a maximum adjustment range. A first sensor for detecting the number of rotations of the current position detection gear, and a first sensor for detecting the number of rotations of the current position detection gear; A second sensor for detecting a start position and an end point position, wherein the second sensor detects an origin position and a maximum adjustment range position of the striker, and a position at which the first sensor detects a current position of the striker. 3. The punch press according to claim 2, further comprising a detection device.