JP2011115804A - Punching press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punching press in which the pressurizing force is adjustable so as to prevent the generation of impressions when pressurizing a workpiece with a plate press provided on the punching press. <P>SOLUTION: In the punching press which includes a punching die 5 changeably, attachably and detachably in the lower end part of a ram 3 which is moved vertically with an actuator for moving vertically and also includes the plate press 11 for pressurizing the workpiece against a die mold, a plate press holder 27 for supporting the plate press 11 encircling the punch 7 of the punching punch 5 is provided freely movably vertically in the downside of an annular lifting member 21 provided freely movably vertically and the actuator 23 is provided for moving the lifting member 21 vertically. A first elastic member for imparting the pressurizing force to the plate press 11 when starting to press the workpiece with the plate press 11, and a second elastic member for imparting the pressurizing force to the plate press 11 when the gap 31 between the lifting member 21 and the plate press holder 27 is not larger than a prescribed value, are provided between the lifting member 21 and the plate press holder 27. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a punch press that performs an appropriate pressing process such as drilling a plate-like workpiece by using a punch mold as an upper mold and a die mold as a lower mold. In some cases, the present invention relates to a punch press that can easily adjust the pressing force of a plate presser that presses the workpiece against a die die so as not to cause indentation.

  In general, in a punch press such as a turret punch press, a configuration in which a plate presser (stripper plate) is provided in an upper die is common. The pressing force by which the plate presser presses the work is generated when the upper die is struck by the ram and the stripper spring provided in the upper die is compressed. Therefore, the pressing force with which the plate presser presses the workpiece is a pressing force preset by each upper mold, and there is little indentation on the upper surface of the workpiece.

  However, punch presses include punch presses configured such that a punch in a punch die and a plate press provided in the punch die are individually moved up and down by an actuator (see Patent Documents 1 and 2).

JP-A-7-246432 JP 2002-143945 A

  The configuration described in Patent Document 1 is a configuration in which a stripper (plate presser) is moved up and down by a hydraulic cylinder, and the pressure oil supplied to the hydraulic cylinder is selected by a high pressure reducing valve and a low pressure reducing valve. . Therefore, when high pressure oil is supplied to the hydraulic cylinder, if there is a dent due to the plate presser on the upper surface of the workpiece, if the pressure is changed to supply low pressure hydraulic pressure, the pressure of the workpiece due to the plate presser is insufficient. May be. That is, in the configuration described in Patent Document 1, there is a problem that it is difficult to press the workpiece with an appropriate pressing force that does not cause indentation due to the plate press by adjusting the pressure oil supplied to the hydraulic cylinder. .

  The configuration described in Patent Document 2 is a configuration in which a plate presser is vertically movable with respect to the plate presser support block below the plate presser support block that is moved up and down by a plate presser up / down cylinder. Therefore, in order to adjust the pressing force of the workpiece by the plate presser, the pressure of the working fluid supplied to the plate presser vertical cylinder is controlled. Therefore, for example, an electromagnetic proportional valve can be employed to control the pressure of the working fluid supplied to the cylinder. However, in this case, there is a problem in the followability of the plate pressing speed by the plate pressing with respect to the repetition speed of the workpiece punching by the punch, and there is a problem in improving the hit rate.

  Therefore, when pressing the workpiece by the plate presser, for example, the plate presser described in Patent Document 2 is configured to be movable up and down with respect to the plate presser block. An elastic member such as a spring is interposed therebetween. Then, the plate presser block can be lowered by the plate presser up / down cylinder, and the reaction force at the time of compression of the elastic member can be used as the pressing force of the plate presser. In this case, the responsiveness (followability) of the elastic member is good, the hit rate can be improved, and the pressing force of the plate presser can be reduced by adjusting the compression amount (deflection amount) of the elastic member. It can be adjusted.

  However, the relative vertical movement range of the plate presser with respect to the punch in the punch die is small (for example, 2 mm), and the elastic member is compressed within this small range, so that the plate presser in the range of 100 kgf to 2100 kgf, for example. It is necessary to generate power. Therefore, the elastic member has a large spring constant.

  By the way, the pressing force (plate pressing force) by which the plate presser presses the workpiece is set to an appropriate value by the tonnage determined by the plate thickness, cutting contour length, and shear stress of the workpiece. The indentation due to the plate retainer is due to the large surface pressure due to the plate retainer. Therefore, for example, when the diameter of the punch in the punch mold changes and the diameter of the plate presser changes, the punching ton number changes and the area of the pressing surface where the plate presser presses the workpiece changes.

  Therefore, it is necessary to adjust to an appropriate pressing force that does not cause indentation on the workpiece every time the punching tonnage of the punch and the pressing area of the plate presser change. In this case, the appropriate pressing force can be preliminarily converted into data corresponding to each material and thickness of the workpiece, but it is difficult to create data in advance for all the workpieces.

  Therefore, trial processing is performed on the workpiece to be processed, and the pressing force of the plate presser is set to an appropriate pressing force. In this case, an appropriate pressing force corresponding to the workpiece is set by repeatedly correcting the initial setting of the pressing force set in advance in the punching die by an appropriate number of times, for example, to increase or decrease by 10%. It is.

  In this case, as described above, in a configuration in which an elastic member such as a spring is interposed between the plate presser block and the plate presser, for example, when the pressing force is small, for example, 10% of 200 kgf, the load becomes 20 kgf. For example, the deflection amount is corrected by 0.03 mm. Further, when the pressing force is large, for example, 10% of 1500 kgf, it becomes 150 kgf, and the deflection amount is corrected by, for example, 0.13 mm. Accordingly, when the pressing force of the plate presser is to be increased / decreased by 10%, for example, the correction amount of the bending amount of the elastic member in the range where the pressing force of the plate presser is small and large is greatly different. It is difficult to correct the amount.

  The present invention has been made in view of the above-described problems, and is provided with a die mold that is detachably replaceable at a lower end of a ram that is moved up and down by an actuator for vertical movement, and a die mold that faces the punch mold, A punch press provided with a plate presser for pressing a plate-like workpiece pressed by the punch die against the die die so as to be movable up and down, and surrounding the ram so as to be movable up and down. A plate press holder for supporting the plate presser surrounding the punch in the punch mold is provided below the annular lift member, and an actuator for moving the lift member up and down is provided. A first elastic member for applying a pressing force to the plate presser when the plate presser starts to press the workpiece between the lift member and the plate presser holder; the lift member and the plate The gap between the e holder is characterized in that it comprises a second elastic member for applying a pressing force to the plate presser and equal to or less than a predetermined value.

  Further, in the punch press, both end portions of the second elastic member are moved up and down more than a distance between contact surfaces at which both end portions of the first elastic member are in contact with the lifting member and the plate holding holder. The distance between the abutting surfaces that abut the member and the plate pressing holder is large.

  Moreover, in the punch press, the second elastic member is formed shorter than the length of the first elastic member.

  In the punch press, the first elastic member and the second elastic member are ridges, and their spring constants are the same or different.

  According to the present invention, the case where the pressing force is applied to the plate presser using the reaction force when only the first elastic member is compressed, and the first and second elastic members are compressed together. When a large pressing force is applied to the plate presser using the reaction force when the pressure is to be increased or decreased by 10%, the amount of bending of the elastic member is corrected when the pressing force is small, and the large pressing force is The correction of the deflection amount of the elastic member at the time of pressure can be approximated, and the correction of the increase / decrease of the pressing force in the range where the pressing force is small and the range where the pressing force is large (correction of the bending amount of the elastic member) is easy. It will be.

It is sectional explanatory drawing which shows the principal part of the punch press which concerns on embodiment of this invention. It is explanatory drawing of the structure which provides pressing force to the plate pressing holder which concerns on embodiment of this invention. It is bottom surface explanatory drawing of a raising / lowering member. It is explanatory drawing of the elastic member engagement hole formed in the bottom face of a raising / lowering member. It is explanatory drawing which showed the relationship between the deflection amount and elastic force of the elastic member for providing pressing force to a board presser.

  Hereinafter, the punch press according to the embodiment of the present invention will be described with reference to the drawings. The overall configuration of the punch press according to the embodiment is the same as and used for the punch press described in Patent Document 2. The configuration of the punch mold is the same. Furthermore, in the punch press according to the embodiment, the configuration for moving the ram up and down, the configuration for moving the plate presser in the punch die up and down, and the like are substantially the same as the configuration of the punch press described in Patent Document 2. Since it is a structure, the structure of the principal part in embodiment of this invention is demonstrated.

  Referring to FIG. 1, an upper frame 1 in a punch press according to an embodiment of the present invention (the whole configuration is not shown) is moved up and down by an appropriate vertical movement actuator (not shown) such as a hydraulic cylinder. A ram 3 such as a large-diameter piston rod is provided to be movable up and down. A punch die 5 as an upper die is provided at the lower end portion of the ram 3 so as to be attachable and detachable. This punch die 5 has the same configuration as the punch die described in Patent Document 2 and is integrally provided with a pull stud 9 on the punch 7. In addition, the punch die 5 is formed by pressing the workpiece such as punching a plate-like workpiece (not shown) in cooperation with a die die (not shown) as a lower die. A plate presser 11 for pressing against the die in the die mold is provided to be movable up and down.

  The ram 3 is provided with a collet chuck 13 in which the punch mold 5 can be attached and detached. The collet chuck 13 has a configuration in which an outer cylinder 15 provided at the lower end portion of the ram 3 is provided with a collet 17 that can grip the pull stud 9 in the punch die 5 so as to be freely opened and closed. The collet 17 is provided in the ram 3 so as to be movable up and down, and is provided at a lower end portion of a vertically moving rod 19 such as a piston rod which is vertically moved by an actuator (not shown) such as a fluid pressure cylinder. .

  Note that the configurations of the punch die 5 and the collet chuck 13 are already known from the above-mentioned Patent Document 2, and therefore a more detailed description is omitted.

  An annular lifting member 21 surrounding the ram 3 is provided below the upper frame 1 so as to be movable up and down. The elevating member 21 is moved up and down by an appropriate vertical movement actuator 23 (see FIG. 2) such as a fluid pressure cylinder mounted on a part of the upper frame 1. An annular plate press holder 27 having a plate press holding portion 25 for holding the plate press 11 in the punch die 5 is supported below the elevating member 21 so as to be movable up and down. .

  More specifically, the plate presser holder 27 is supported so as to be movable up and down via a plurality of suspensions 29 such as suspension bolts that penetrate the elevating member 21 so as to move up and down. A slight gap 31 of about 2 mm, for example, is formed between the upper surface 27U and the lower surface 21B of the elevating member 21. Therefore, the plate pressing holder 27 moves up and down with respect to the elevating member 21 in the range of the gap 31.

  When the plate-like workpiece is subjected to press working such as punching by the punch 7 in the punch die 5, a pressing force is applied to the plate presser 11 in order to press and fix the workpiece to the die by the plate presser 11. A plurality of elastic members 33 such as coil springs are provided between the elevating member 21 and the plate pressing holder 27. More specifically, an elastic member engagement hole 35 engaged with the upper end side of the elastic member 33 such as a coil spring is appropriately formed on the same circle as shown in FIG. It is formed at intervals.

  The plurality of elastic member engagement holes 35 include a first elastic member engagement hole 35A having a shallow depth H1 from the lower surface of the elevating member 21 (see FIG. 4A) and a depth H2 (see FIG. 4). B) is divided into deep second elastic member engagement holes 35B, and the elastic member engagement holes having the same depth are provided at symmetrical positions. It should be noted that whether the elastic member engagement holes 35A and 35B are formed on the lower surface 21B of the elevating member 21 or the upper surface of the plate holding holder 27 is relative. The elastic member engagement hole 35 may be provided in one or both as appropriate.

  The vertical dimension of each of the elastic members 33 whose upper end side engages with the first and second elastic member engaging holes 35A and 35B is equal. Therefore, in a normal state, the lower end portion of the elastic member (first elastic member) 33 engaged with the first elastic member engaging hole 35A is in contact with the upper surface of the plate holder 27, and the upper end portion is the first elastic member. The first elastic member engagement hole 35 </ b> A is in contact with the inner wall surface (contact surface) 37 </ b> A. The lower end portion of the elastic member (second elastic member) 33 engaged with the second elastic member engaging hole 35B is in contact with the upper surface of the plate holder 27, but the upper end portion is the second end portion. The elastic member engagement hole 35B is slightly away from the back wall surface (contact surface) 37B.

  In other words, the upper surface (contact surface) of the plate presser holder 27 in which the upper end portion of the first elastic member 33 engaged with the first elastic member engagement hole 35A contacts the contact surface 37A of the elevating member 21 and the lower end portion. ) Is smaller than the distance between the contact surface 37A of the second elastic member engagement hole 35B and the upper surface (contact surface) of the plate holder 27. Accordingly, when the actuator 23 is actuated to lower the elevating member 21 and the pressing of the workpiece by the plate retainer 11 held by the plate retainer holder 27 is started, the first elastic member engaging hole 35A engaged with the first elastic member engaging hole 35A. One elastic member 33 is compressed, and a pressing force is applied to the plate presser 11 by the reaction force of the first elastic member 33.

  Then, the lowering of the elevating member 21 by the actuator 23 further proceeds, the plate pressing holder 27 is relatively raised, the first elastic member 33 is gradually compressed, and the elevating member 21 and the plate pressing holder 27 are When the gap 31 reaches a predetermined value set in advance, the upper end portion of the second elastic member 33 engaged with the second elastic member engagement hole 35B becomes the contact surface 37B of the second elastic member engagement hole 35B. Abut. Therefore, when the gap 31 is equal to or less than the predetermined value, the first and second elastic member engagement holes 35A and 35B are compressed simultaneously (both).

  Therefore, the reaction force F (thrust) when compressing only the first elastic member 33 to apply the pressing force to the plate presser 11 is expressed by a linear function A shown in FIG. 5 in relation to the deflection amount x. It is. When the gap 31 becomes equal to or less than a predetermined value, it is expressed by a linear function B. That is, it is represented by a linear function A having a small tilt angle when the pressing force by the plate presser 11 is small, and is represented by a linear function B having a large tilt angle when the pressing force is large.

  Therefore, the change in the horizontal direction (actually the vertical direction) in FIG. 5 with respect to the case where the pressing force is increased / decreased by, for example, 10% in a small pressing range (when the linear function A is changed to 20 kgf as 10% of 200 kgf, for example). The amount of change (the amount of bending of the first elastic member) and the amount of change (in the case of changing 150 kgf, for example, 10% of 1500 kgf in the linear function B) when the pressing force is increased or decreased by, for example, 10% within a large pressing force range 1 and the amount of bending of the second elastic member), for example, when the amount of change is 150 kgf in the linear function A, compared with the amount of change in the horizontal direction in FIG. The amount of change in direction can be made smaller and approximated.

  Accordingly, the adjustment of several percent of the pressing force in the range where the pressing force of the plate presser 11 is small (the range represented by the linear function A), and the pressing force in the range where the pressing force is large (the range represented by the linear function B). Adjustment of several percent can be easily performed.

  It is detected whether the pressing force of the plate presser 11 is within the range represented by the linear function A or the range represented by the linear function B, and the deflection amount of the first and second elastic members is controlled. Therefore, a gap detecting means 39 for detecting the size of the gap 31 between the elevating member 21 and the plate pressing holder 27 is provided. As the gap detection means 39, the plate press holder 27 is relatively lifted relative to the dimension of the gap 31 in the initial state in which the plate press holder 27 is suspended from the lifting member 21. Any configuration capable of detecting (detecting) that the dimensions have gradually decreased can be employed. For example, an appropriate sensor such as a potentiometer or a distance sensor can be employed.

  Therefore, by detecting the size of the gap 31 by the gap detecting means 39, it is known whether the pressing force by the plate presser 11 is in the range represented by the linear function A or the range represented by the linear function B. be able to. Then, knowing whether the correction is based on the linear function A or the linear function B, the deflection amount of the first and second elastic members 33 is controlled, and the pressing force of the plate presser 11 is controlled. Correction can be easily performed. That is, the amount of deflection of the first and second elastic members 33 can be detected by detecting the size of the gap 31 by the gap detecting means 39. Therefore, by controlling the operation of the actuator 23 based on the detection value by the gap detection means 39 and controlling the dimension of the gap 31, the pressing force by the plate presser 11 can be controlled to an appropriate value. It is.

  As will be understood from the above description, in the configuration in which the pressing force is applied to the plate presser 11 by compressing the elastic member having a large spring constant, the pressing amount is adjusted by adjusting the compression amount (deflection amount) of the elastic member. Even when the pressure changes greatly, the pressing force can be largely adjusted in a range where the amount of bending of the elastic member is small.

  Therefore, it is not necessary to bend the elastic member greatly, and the configuration can be made compact. Also, when the pressing force is adjusted by several percent in the range where the pressing force of the plate presser is small and large, it is possible to approximate the correction of the bending amount of the elastic member in both ranges, and the adjustment (correction) ) Can be easily performed.

  The present invention is not limited to the above-described embodiment, and can be implemented in other forms by making appropriate changes. For example, the depth of the elastic member engagement hole 35 is not limited to H1 and H2, but by increasing the depth, the number of the elastic members 33 to be compressed gradually increases as the gap 31 gradually decreases. It is also possible. Further, when the distance between the contact surface of the elevating member 21 and the contact surface of the plate pressing holder 27 is made equal, and the length of each elastic member 33 is made different, the size of the gap 31 gradually decreases. A configuration in which the elastic member 33 is sequentially compressed is also possible. Furthermore, the spring constants of the elastic members 33 may be the same or different.

  With the configuration as described above, the range in which the pressing force by the plate presser 11 is small and the range in which the pressing force is large can be expressed by combining a plurality of linear functions. Therefore, when the pressing force of the plate presser 11 is corrected by, for example, several percent, correction in a range where the pressing force is small to a large range becomes easier.

3 Ram 5 Punch Die 7 Punch 11 Plate Presser 13 Collet Chuck 21 Elevating Member 23 Actuator 25 Plate Presser Holding Unit 27 Plate Presser Holder 31 Gap 33 Elastic Member 35 Elastic Member Engagement Hole 37A, 37B Abutting Surface 39 Gap Detection Means

Claims (4)

  A punch mold is provided at the lower end of the ram that is moved up and down by the vertical movement actuator so that the punch mold can be attached and detached, and a die mold facing the punch mold and a plate-like workpiece that is pressed by the punch mold A punch press provided with a plate presser for pressing the die mold so as to be movable up and down, wherein the punch in the punch mold is provided below the annular lifting member surrounding the ram and freely movable up and down. A plate press holder for supporting the plate press surrounding the plate press is provided so as to freely move up and down, and an actuator for moving the lift member up and down is provided, and the plate is interposed between the lift member and the plate press holder. When the presser starts to press the work, when the gap between the first elastic member for applying a pressing force to the plate presser and the lift member and the plate presser holder becomes a predetermined value or less, the plate presser is pressed. Punch press, characterized in that it comprises a second elastic member for applying a pressing force to.   2. The punch press according to claim 1, wherein both end portions of the second elastic member are larger than a distance between contact surfaces at which both end portions of the first elastic member are in contact with the elevating member and the plate pressing holder. The punch press is characterized in that a large distance is provided between the abutting surfaces that abut on the elevating member and the plate pressing holder.   The punch press according to claim 1, wherein the second elastic member is formed shorter than the length of the first elastic member.   4. The punch press according to claim 1, wherein the first elastic member and the second elastic member are ridges, and the respective spring constants are the same or different.

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