JP2007125592A - Folding method by punch press, and punch press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding method for folding a rising part of a workpiece at a right angle, and a punch press. <P>SOLUTION: The folding method is used with a punch press having a workpiece-moving/positioning device for freely moving and positioning the workpiece relatively in X, Y-axis directions with respect to upper and lower dies at a working position. The method comprises: forming the rising part WU of the workpiece W by upper and lower dies; and forming the rising part WU again by the same dies by slightly changing the folding positions 35A, 35B of the workpiece W. A control device 45 for controlling the punch press is provided with: a calculation unit 51 for obtaining the second forming position 35B from the first forming position 35A at which the rising part of the workpiece is formed; and a movement distance control unit 55 for controlling the movement distance of the workpiece based on the result of the calculation unit 51. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of bending a work by an appropriate punch press such as a turret punch press and the punch press, for example, and more specifically, after a rising portion is bent by upper and lower molds in the punch press. The present invention relates to a bending method and a punch press that can correct the spring back of the rising portion and perform the bending more accurately.

Conventionally, after performing U-shaped punching on a sheet-like workpiece, the tongue-shaped portion surrounded on three sides by the U-shaped punched portion is bent at a right angle upward to form a rising portion. Although conventionally formed, as shown in FIG. 4, the die is provided to press the rising portion 107 against the vertical inner surface 105 of the recess 103 formed on the lower surface of the punch 101. The rising portion 107 is bent by iron bending by relatively raising the die chip 109 (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 6-15378

  In the configuration described in Patent Document 1, bending is performed by ironing so that the rising portion 107 is pressed against the vertical inner surface 105 of the recess 103 formed on the lower surface of the punch 101. The rising portion 107 could not be bent at a right angle (vertical) by the spring back of the portion 107.

  The present invention has been made in view of the conventional problems as described above, and the invention according to claim 1 is capable of moving and positioning the workpiece relative to the upper and lower molds at the machining position in the X and Y axis directions. In the punch press having the configuration of the workpiece movement positioning apparatus, after the rising portion is formed on the workpiece by the upper and lower molds, the bending position of the workpiece is slightly changed, and the rising portion is formed by the same die. This is a bending method using a punch press that performs the molding process again.

  The invention according to claim 2 is the bending method according to claim 1, wherein the dimension between the first forming position and the second forming position is equal to or less than the plate thickness of the workpiece. Bending method.

  The invention according to claim 3 includes a workpiece movement positioning device that can move and position the workpiece relatively in the X and Y axis directions relative to the upper and lower dies provided at the machining position, and moves the upper die up and down. In a punch press having a configuration in which a ram is provided to be movable up and down, a control device for controlling the punch press has a second forming process from a first forming position when forming a rising portion on a workpiece. It is the structure provided with the calculating part which calculates | requires a position, and the movement amount control part for controlling the movement amount of the said workpiece | work based on the calculation result of this calculating part.

  According to the present invention, it is easy to accurately bend the rising portion at right angles to the workpiece, and the conventional problems as described above can be solved.

  Hereinafter, embodiments of the present invention will be described. A punch press according to an embodiment of the present invention includes, for example, a turret punch press, a plurality of punches and dies in a plurality of rows and a plurality of rows, and is movable up and down above the punch. It relates to various types of punch presses such as a punch press having a ram configuration or a punch press in which a pair of punches and dies can be freely exchanged by a tool changer with respect to the processing position, and the mechanical configuration is A known configuration may be used.

  As described above, the mechanical configuration of the punch press may be a known configuration, but in order to facilitate understanding, the main configuration is schematically illustrated by exemplifying the case of the turret punch press as an example of the punch press. Explained.

  Referring to FIG. 1, a turret punch press as an example of a punch press 1 includes a frame 3, and an upper frame 3U in the frame 3 supports a plurality of upper molds 5 so as to be movable up and down. An upper turret 7 as a mold holder is rotatably supported, and a lower turret 11 as a lower mold holder supporting a plurality of lower molds 9 corresponding to the upper mold 5 is rotatable on the lower frame 3L. It is supported by.

  Further, the upper frame 3U is provided with a ram driving actuator 15 for moving up and down a ram (striker) 13 that can freely press the upper mold 5 that is relatively positioned and positioned at the processing position. . The ram driving actuator 15 is composed of, for example, a hydraulic cylinder, a ball screw mechanism, or the like, and is configured such that the lowering speed, lowering position, etc. of the ram 13 can be adjusted. The lower frame 3L is desirably provided with an actuator 17 such as a hydraulic cylinder for moving up and down the lower mold for moving the lower mold 9 supported by the lower turret 11 up and down.

  A workpiece movement positioning device 19 is provided which can move and position the sheet-like workpiece W in the X and Y axis directions with respect to the upper and lower molds 5 and 9 which are indexed and positioned at the machining position. More specifically, a carriage 25 having a work clamp 23 capable of gripping a work W on a carriage base 21 supported by the lower frame 3L so as to be movable in the Y-axis direction (left-right direction in FIG. 1) is provided in the X-axis direction. It is supported so as to be movable in the direction perpendicular to the paper surface in FIG.

  Accordingly, the carriage base 21 is moved in the Y-axis direction and the carriage 25 is moved in the X-axis direction under the control of a control device (not shown in FIG. 1) such as a CNC control device. The workpiece W is moved in the X and Y axis directions, and the workpiece W is moved and positioned with respect to the dies 5 and 9 above and below the machining position.

  By the way, in order to bend the rising portion of the sheet-like workpiece W, for example, as described in Patent Document 1, a U-shaped punching process is performed on the workpiece W, and this U-shaped By bending the tongue-shaped part surrounded on three sides by the punching part upward, and by appropriately punching the work W, the protruding part formed on the work W is folded upward. It is done by bending. In short, a part of the workpiece W is bent upward.

  When a part of the workpiece W is bent upward by the upper and lower molds 5 and 9 in the punch press, the rising part is bent by the relative movement of the upper and lower molds 5 and 9. This bending method corresponds to the ironing bending described in Patent Document 1. Therefore, when the upper and lower molds 5, 9 are engaged, the rising part of the workpiece can be bent at a right angle (vertical), but it is extremely difficult to bend at a right angle with high accuracy by the spring back. Met.

  Therefore, in the present embodiment, as the upper and lower molds in the punch press, a known mold as described in Patent Document 1 is used to bend the rising portion of the workpiece W at a right angle (perpendicular). It is.

  More specifically, as shown in FIG. 2, after the work W is pressed and fixed on the die base 29 in the lower mold 27 by the upper mold (punch) 31, the lower mold 27 is relatively movable up and down. The die chip 33 is relatively lifted, and the rising portion WU is bent by bending the protruding portion of the workpiece W upward.

  At this time, the rising portion WU of the work W is bent so as to be pressed against the vertical surface 31F of the upper mold 31, and even if the vertical surface 31F is inclined temporarily, Since the die chip 33 moves vertically, the die chip 33 cannot be bent at an acute angle so as to press the rising portion WU against the inclined surface.

  Therefore, when the restraint of the workpiece W by the upper and lower molds is released, the rising portion WU tends to return by the spring back, so that the angle A formed by the workpiece W and the rising portion WU is larger than a right angle.

  Therefore, in the present embodiment, the same mold is used to form the above-described portion at the molding position 35B slightly separated from the position of the first molding position (folding position) 35A where the rising portion WU is bent. In the same manner as described above, the forming process of the rising portion WU is performed again. The dimension L between the first forming position 35A and the second forming position 35B is preferably smaller than the plate thickness T of the workpiece W, and more preferably, the size L is several minutes of the plate thickness T. From about 1 to about 1 is desirable.

  When the first bending process of the rising part WU is performed, the bent part where the rising part WU is bent is in a state of being plastically deformed and cured, and the second bending process is performed with this plastic deformation. Within the generated region, the amount of spring back by the second bending process is extremely smaller than the amount of spring back for the first time. Therefore, the bending process of the rising portion WU can be performed with higher accuracy.

  In the above description, the case where the rising portion WU is bent vertically (at a right angle) in the first bending process has been described. However, for example, the bending process at the angle θ1 is performed at the first bending process. Further, it is also possible to perform the bending process at the angle θ2 at the time of the second bending process by slightly changing the bending process position. In this case, in consideration of the springback α of the rising portion WU, the bending process is performed so that θ1 + θ2≈90 ° + α.

  A control device (CNC control device) 45 (see FIG. 3) for controlling the punch press 1 to perform the bending process as described above includes an input unit 47 for inputting a machining program and the like. A program analysis unit 49 for analyzing the inputted machining program is provided. The program analysis unit 49 functions to analyze whether or not it is a mold for forming the rising portion WU by using the upper and lower mold numbers used when the workpiece W is processed. .

  Further, the CNC device 45 includes a calculation unit 51. When the upper and lower molds are molds for bending the rising portion WU, the calculation unit 51 performs the second operation based on the plate thickness and material of the workpiece W previously input as machining data. The bending position is calculated by multiplying the plate thickness by a coefficient set in advance according to the plate thickness and material of the workpiece. Note that the second bending position may be stored in a memory in advance according to the thickness and material of the workpiece, and in this case, the second bending process may be performed from the data table. It serves to search for a position.

  The CNC control device 45 includes a stop control unit 53 for controlling the lowering stop position of the ram 13 or the rising stop position of the die chip based on the analysis result of the program analysis unit 49. The stop control unit 53 is a case where the analysis result of the program analysis unit 49 is a mold for forming the rising portion, and the bending process in which the first bending angle is different from the second bending angle is performed. When performing the above, the ram driving actuator 15 or the actuator 17 is controlled so as to control the engagement relationship between the upper and lower molds, that is, the position where the die chip is lifted and stopped relative to the punch.

  Further, the CNC device 45 is provided with a movement amount control unit 55 that can control the movement amount of the workpiece movement positioning device 19. The movement amount control unit 55 performs workpiece movement positioning so that the workpiece W is moved and positioned at the second folding position after the first folding process based on the calculation result of the calculation unit 51. The amount of movement of the device 19 is controlled.

  As already understood, when the punch press 1 is controlled under the control of the CNC controller 45 and the rising portion WU of the workpiece W is bent, the upper and lower molds are based on the analysis result of the program analysis unit 49. As a result, the first bending of the rising portion WU of the workpiece W is performed.

  Thereafter, based on the movement amount calculated in advance by the calculation unit 51, the workpiece movement positioning device is controlled so that the second bending position corresponds to the upper and lower molds under the control of the movement amount control unit 55. After the movement amount 19 is controlled and the movement positioning of the workpiece W is performed by a minute amount, the rising portion of the workpiece W is bent again.

  As already understood, when bending the rising part of the workpiece W, it can be bent at a right angle by performing the bending process twice and reducing the influence of the spring back of the rising part. Yes, the conventional problems as described above can be solved.

It is explanatory drawing of the turret punch press as an example of a punch press. It is an operation explanatory view in the case of bending the rising portion on the workpiece and then bending it again to bend the rising portion accurately at a right angle. It is a functional block diagram which shows the principal part in the control apparatus which controls a punch press. It is effect | action explanatory drawing which shows the example of a process of the standup | rising part by the conventional metal mold | die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Punch press 27 Lower metal mold | die 31 Punch 33 Die-chip 35A First folding position 35B Second folding position WU Rising part 45 CNC control device 53 Stop control part 55 Movement amount control part

Claims (3)

  In a punch press with a workpiece movement positioning device that can move and position the workpiece relative to the upper and lower molds at the machining position, a rising portion is formed on the workpiece by the upper and lower molds. A bending method by a punch press, wherein after the processing, the bending position of the workpiece is slightly changed and the rising portion is formed again by the same mold.   2. The bending method according to claim 1, wherein a dimension between the first molding position and the second molding position is equal to or less than a plate thickness of the workpiece. .   A workpiece movement positioning device that can move and position the workpiece relatively in the X and Y axis directions relative to the upper and lower dies provided at the machining position, and a ram for moving the upper die up and down can be moved up and down. In the punch press having the configuration provided, the control unit for controlling the punch press includes a calculation unit for obtaining a second molding position from a first molding position when molding the rising portion on the workpiece, A punch press comprising: a movement amount control unit for controlling a movement amount of the workpiece based on a calculation result of the calculation unit.

Images