JP4099993B2 - Punch press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a punch press having an anti-vibration function for suppressing vibration generated during punching.
[0002]
[Prior art]
A general turret punch press has a front-open frame called a C-shape or a U-shape, and upper and lower turrets supporting a plurality of tools are arranged in a space between upper and lower frame portions. . A punch driving mechanism is installed in the upper frame portion, and a plate material is punched with a predetermined position at the front portion of the turret as a punch position. The lower frame portion has an extension frame portion that extends forward from the front end of the upper frame, and a carriage that moves back and forth toward the punch position is provided on the extension frame portion. A cross slide having a work holder is provided on the carriage so as to be movable in the left-right direction. The carriage is moved by a ball screw extending in the front-rear direction installed on the extension frame, and the movement is restricted by a guide extending in parallel with the ball screw. The plate material gripped by the work holder is fed by the longitudinal movement of the carriage and the horizontal movement of the cross slide, and a desired position of the plate material is punched at the punch position.
[0003]
[Problems to be solved by the invention]
When punching is performed after the plate material is positioned, the frame vibrates. Along with this, the ball screw supported by the lower frame part also vibrates. In this case, if the resonance frequency of the frame and the resonance frequency of the ball screw coincide, a large vibration is generated in the ball screw. If the resonance frequency is different, a large vibration can be avoided, but the resonance frequency of the ball screw changes according to the movement of its nut position, and may coincide with the resonance frequency of the frame depending on the front and rear positions of the carriage for positioning the plate material. Arise. In particular, if continuous punching such as nibbling or the like is performed along the lateral direction at the front and rear positions of the carriage having the same resonance frequency, processing that causes large vibrations can be continued. Such large vibrations damage the ball screw early. In addition, if the plate material feeding is started without sufficiently converging these vibrations, the machining accuracy is deteriorated. Therefore, the next plate material feeding cannot be performed until the vibrations converge, and the machining time is long.
Various types of punch presses have been proposed in which a vibration absorbing member is attached to absorb the frame (for example, Japanese Patent Laid-Open Nos. 8-318329 and 9-150299). However, these are all designed to absorb the vibration of the upper frame portion where the punch driving mechanism is installed in the frame, and the vibration absorbing member is attached to the upper frame portion. Is not a solution.
[0004]
The object of the present invention is to suppress the occurrence of large vibrations in the drive transmission member of the plate material feeding mechanism accompanying punching, to prevent damage to the machine and to maintain machining accuracy without lengthening the machining cycle time. An object of the present invention is to provide a punch press that can be used.
[0005]
[Means for Solving the Problems]
The punch press according to the present invention comprises an upper frame, a lower frame having an extension frame portion extending forward from the front end of the upper frame, and a vertical opening connecting the upper frame and the rear end of the lower frame. A mold frame, a punch drive mechanism installed in the upper frame, a plate material feed mechanism that is provided in the extension frame portion and moves the plate material back and forth using a rod-like drive transmission member extending in the front-rear direction, and the extension frame portion And a dynamic vibration absorber provided in the vehicle. It said rod-like drive transmission member, for example Ru screw shaft der in the ball screw. The plate material feeding mechanism has a carriage that is driven forward and backward along the left and right rails on the extension frame portion together with the movable table, and a cross slide to which a work holder is attached is installed on the carriage so as to be movable forward and backward. It is a thing.
According to the configuration of this, the vibration of the frame generated by the punching is vibration absorbing by the dynamic vibration absorber. Since the dynamic vibration absorber is provided in the extension frame portion, the vibration in the extension frame portion is particularly effectively absorbed. Therefore, regardless of the position of the carriage in the front-rear direction, the rod-shaped drive transmission member of the plate material feed mechanism installed in the extension frame portion and the frame can be prevented from resonating and causing large vibrations. As a result, the machine can be prevented from being damaged, and the machining accuracy can be maintained without lengthening the machining cycle.
[0006]
The said structure WHEREIN: The said dynamic vibration absorber may be provided in the front part of the extension flame | frame part. When the dynamic vibration absorber is arranged at the front portion of the extension frame portion in this way, the vibration absorption effect by the dynamic vibration absorber can be maximized.
In the above structure, the dynamic vibration reducer in the lateral center of a between the left right rail on the upper surface of the extension frame portion, and the carriage is positioned capable disposed above, the drive transmission of said sheet feeding mechanism You may arrange | position a member in the position biased from the center of the left-right direction of the said extension frame part. The dynamic vibration absorber is preferably disposed at the center in the left-right direction of the extension frame from the viewpoint of vibration absorption effect, and the drive transmission member is also preferably disposed at the center in the left-right direction. It will be bulky. Even if the drive transmission member is deviated from the center, there is no problem. As described above, the dynamic vibration absorber is arranged in the center, and the drive transmission member is arranged in the deviated position, so that an extension frame is obtained while obtaining an excellent vibration absorption effect. The dynamic vibration absorber and the plate material feeding mechanism can be stored compactly on the part.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing a schematic configuration of the punch press of this embodiment, and FIG. 3 is a side view thereof. This punch press is a turret punch press and has a front opening type frame 1. The front open frame 1 includes an upper frame 1A having a box-shaped cross section, a lower frame 1B having an extension frame portion 1BB extending forward from the front end of the upper frame 1A, and the upper frame 1A. And a vertical frame 1C connecting the rear ends of the lower frame 1B. The extension frame portion 1BB may be provided integrally with other portions in the front opening type frame 1, or may be provided separately and joined to the other portions. Upper and lower turrets 2A and 2B supporting a plurality of tools are disposed in a space between the upper frame 1A and the lower frame 1B in the front open frame 1 and are rotatably supported by the upper frame 1A and the lower frame 1B, respectively. ing. A plurality of punch dies 3 are installed on the circumference of the upper turret 2A, and a plurality of die dies 4 are installed on the circumference of the lower turret 2B.
[0008]
The upper frame 1A is provided with a punch drive mechanism 5 for punching the plate material W. The punch drive mechanism 5 includes a motor 6 such as a servo motor, a conversion mechanism (not shown) that converts the rotation of the motor 6 into a linear reciprocating motion in the vertical direction, and is driven up and down by the conversion mechanism to move the punch position P It comprises a ram (not shown) for punching the punch mold 3.
[0009]
The extension frame portion 1BB of the lower frame 1B is provided with a plate material feeding mechanism 8 for moving the plate material W on the table 7 and positioning an arbitrary portion of the plate material W at the punch position P. The table 7 includes a central fixed table 7a provided on the extension frame portion 1BB and movable tables 7b on both sides thereof. The movable table 7b is driven to move forward and backward (Y direction) on the rail 10 on the extension frame portion 1BB together with the carriage 9 of the plate material feeding mechanism 8.
The plate material feeding mechanism 8 includes a carriage 9 that can be moved back and forth on the rail 10, a cross slide 14 that is installed on the carriage 9 so as to be able to move back and forth in the left-right direction (X direction), and to which a work holder 13 is attached. 9 and the cross slide 14 are respectively provided with a front-rear direction drive mechanism 12 and a left-right direction drive mechanism 16. As shown in FIGS. 2 and 5, the front-rear direction drive mechanism 12 includes a rod-shaped drive transmission member 12 a extending in the front-rear direction, and a motor 11 that rotates the drive transmission member 12 a. The rod-shaped drive transmission member 12a is a screw shaft in a ball screw, and a nut (not shown) provided on the carriage 9 is screwed together. The rod-shaped drive transmission member 12a is disposed at a position deviated from the center in the left-right direction (X direction) of the extension frame 1BB, and extends in the front-rear direction in parallel with the rail 9. As shown in FIG. 5, the left-right direction drive mechanism 16 has a rod-like drive transmission member 16a as in the front-rear direction drive mechanism 12, and a motor 15 that rotates the drive transmission member 16a. The screw shaft of the screw is used. A ball nut 17 provided on the cross slide 14 is screwed into the drive transmission member 16a. The work holder 13 holds the plate material W.
[0010]
2 and 4 are a plan view and a side view, respectively, in a state in which the plate material feeding mechanism 8 and the table 7 in FIG. 5 are removed. As shown in the figure, a dynamic vibration absorber 18 is provided at the center in the left-right direction of the front portion of the extension frame portion 1BB. The dynamic vibration absorber 18 absorbs vibration generated in the frame 1 during punching. As shown in the plan view and the cross-sectional view in FIGS. 6A and 6B, the dynamic vibration absorber 18 includes a plurality of rubber members 19 distributed on the upper surface of the extension frame portion 1BB, and the plurality of rubber members. The weight member 20 is placed over the member 19. Although the number of the rubber members 19 is six in the illustrated example, the number of the rubber members 19 may be four, or may be only one, but at least the left and right directions are balanced on the extension frame portion 1BB. It is preferable to be installed in a state. The weight member 20 includes a plurality of stacked weight plates 20A and 20B. The rubber member 19 has a cylindrical shape and is solid. The rubber member 19 has attachment plates 21A and 21B attached to the lower surface and the upper surface by adhesion or the like. The rubber member 19 is fixed to the upper surface of the extension frame portion 1BB by fastening the attachment plate 21 on the lower surface to the extension frame portion 1BB with a bolt 22. The weight member 20 is placed on the mounting plate 21B on the upper surface of the rubber member 19, and is fastened on the rubber member 19 by a stud 23 protruding from the mounting plate 21B and a nut 24 screwed into the stud 23. Is done. When the weight member 20 is composed of a plurality of weight plates 20A and 20B as in the illustrated example, the stud 23 is a hole provided in the lowermost weight plate 20A among the plurality of weight plates 20A and 20B. The lowermost weight plate 20A is fastened. In this case, the lowermost weight plate 20A and the other weight plate 20B stacked thereon are a plurality of bolts 25 penetrating the weight plates 20A and 20B, and nuts screwed to the bolts 25. 26 is integrated. Further, each of the other weight plates 20B in the lowermost layer is provided with a hole in which the nut 24 is loosely fitted. One or more of the uppermost weight plates 20B are thinner and lighter than the other weight plates 20B, and fine adjustment of the vibration absorption frequency by weight adjustment is possible.
[0011]
The operation of the above configuration will be described. The plate material W on the table 7 is gripped by the work holder 13 of the plate material feed mechanism 8, and the carriage 9 is moved back and forth (Y direction) so that an arbitrary part of the plate material W comes to the punch position P of the punch drive mechanism 5. The positioning is performed by moving the cross slide 14 in the left-right direction (X direction). In this positioning state, the plate material W is punched by the punch drive mechanism 5.
Due to this punching, vibration is generated in the front opening type frame 1, but since the dynamic vibration absorber 18 is installed at the front center of the extension frame portion 1BB of the lower frame B, the vibration of the extension frame portion 1BB is suppressed. The For this reason, even if the resonance frequency f _F of the extension frame 1BB due to vibration and the resonance frequency f _S of the rod-like drive transmission member 12a of the plate material feeding mechanism 8 coincide with each other, the vibration of the drive transmission member 12a may become too large. Absent. Therefore, it is possible to prevent the drive transmission member 12a and the like from being damaged due to vibration. In addition, since vibrations generated by punching converge in a short time, the plate material can be moved immediately after punching, and a predetermined processing accuracy can be maintained without increasing the processing cycle time.
[0012]
The dynamic vibration absorber 18 may be installed at an arbitrary position of the extension frame portion 1BB. However, in this embodiment, the dynamic vibration absorber 18 is installed at the front portion of the extension frame portion 1BB. 18 can maximize the anti-vibration effect.
Further, the dynamic vibration absorber 18 is disposed at the center in the left-right direction of the extension frame portion 1BB, and the rod-shaped drive transmission member 12a of the plate material feeding mechanism 8 is disposed at a position offset from the center in the left-right direction of the extension frame portion 1BB. Therefore, the dynamic vibration absorber 18 and the plate material feeding mechanism 8 can be compactly accommodated on the extension frame portion 1BB while ensuring the excellent vibration absorption effect by the dynamic vibration absorber 18.
[0013]
The weight of the weight member 20 in the dynamic vibration absorber 18 is adjusted so that the vibration of the rod-shaped drive transmission member 12a of the plate material feeding mechanism 8 is minimized in the trial operation prior to the actual operation of the punch press.
The weight member 20 is constituted by a plurality of weight plates 20A and 20B in the above embodiment, but the weight member 20 may be an integral member as shown in FIG. 7 or FIG. In the example of FIG. 7, a hole with countersink is provided in the weight member 20 and coupled to the stud 23 of the mounting plate 21 </ b> B of each rubber member 19. In the example of FIG. 8, the stud 23 of the weight member 20 is inserted. This is an example in which the hole is a hole without counterbore. When the weight member 20 is constituted by a plurality of weight plates 20A and 20B as in the embodiment of FIG. 6 and the like, it is light when removing and assembling and can be easily held by an operator, so that workability is good. It is also easy to adjust the weight. When the weight member 20 is an integral type, mutual assembly work in the case of the weight plate is unnecessary, and the number of work steps can be reduced. For this reason, for example, the weight member 20 may be of a multi-layer type in a test punch press, and may be an integral type in a mass-production machine. It may be replaced with an integrated type.
[0014]
In the above embodiment, the rod-shaped drive transmission member 12a extending in the front-rear direction of the plate material feeding mechanism 8 is a screw shaft of a ball screw. However, this rod-shaped drive transmission member 12a is a rod-shaped drive such as a rack, for example. Any member may be used as long as it transmits the signal.
[0015]
【The invention's effect】
The punch press according to the present invention comprises an upper frame, a lower frame having an extension frame portion extending forward from the front end of the upper frame, and a vertical opening connecting the upper frame and the rear end of the lower frame. A mold frame, a punch drive mechanism installed in the upper frame, a plate material feed mechanism that is provided in the extension frame portion and moves the plate material back and forth using a rod-like drive transmission member extending in the front-rear direction, and the extension frame portion Therefore, it is possible to prevent the vibration of the frame generated by punching from resonating with the drive transmission member of the plate material feeding mechanism to generate a large vibration. As a result, the machine can be prevented from being damaged, and the machining accuracy can be maintained without lengthening the machining cycle.
When the dynamic vibration absorber is provided in the front portion of the extension frame portion, the vibration isolation effect of the drive transmission member by the dynamic vibration absorber can be maximized.
Further, the lateral center of a between the left right rail on the upper surface of the dynamic vibration reducer is extended frame portion, and the carriage is positionable positioned upward, the extension of the drive transmission member of the sheet feeding mechanism Since the frame portion is disposed at a position deviated from the center in the left-right direction, the dynamic vibration absorber and the plate material feeding mechanism can be compactly accommodated on the extension frame portion.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic configuration of a punch press according to an embodiment of the present invention.
FIG. 2 is a plan view showing a state in which a plate material feeding mechanism and a table are removed in the punch press.
FIG. 3 is a side view showing a schematic configuration of the punch press.
FIG. 4 is a side view showing a state in which a plate material feeding mechanism and a table are removed in the punch press.
FIG. 5 is a perspective view of the punch press.
6A is a plan view of a dynamic vibration absorber in the punch press, and FIG. 6B is a longitudinal sectional view of the dynamic vibration absorber.
FIG. 7 is a longitudinal sectional view of a modified example of the dynamic vibration absorber.
FIG. 8 is a longitudinal sectional view of another modification of the dynamic vibration absorber.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Front opening type frame 1A ... Upper frame 1B ... Lower frame 1BB ... Extension frame part 1C ... Vertical frame 5 ... Punch drive mechanism 8 ... Plate material feed mechanism 12a ... Drive transmission member 18 ... Dynamic vibration absorber W ... Plate material

Claims (3)

A front frame comprising an upper frame, a lower frame having an extended frame portion extending forward from the front end of the upper frame, a vertical frame connecting the upper frame and the rear end of the lower frame, and an upper frame. An installed punch drive mechanism, a plate material feed mechanism that is provided in the extension frame portion and moves the plate material back and forth using a rod-like drive transmission member extending in the front-rear direction, and a dynamic vibration absorber provided in the extension frame portion The plate material feeding mechanism includes a movable table and a carriage that is driven back and forth on the left and right rails on the extension frame portion, and a cross slide to which a work holder is attached is advanced and retracted in the left and right direction with respect to the carriage. has been established freely, the dynamic vibration reducer is a between the left right rail on the upper surface of the extension frame portion left In the center direction, and the carriage is positionable to place upward punch press said drive transmission member of the sheet feeding mechanism is arranged at a position offset from the center in the lateral direction of the extension frame portion.   The punch press according to claim 1, wherein the dynamic vibration absorber is provided at a front portion of the extension frame portion.   The punch press according to claim 1 or 2, wherein the rod-shaped drive transmission member is a screw shaft in a ball screw.

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