JP2007125591A - Folding method by punch press and punch press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding method for forming a rising part of a workpiece by folding the workpiece, then folding the rising at an acute angle, and to provide a punch press. <P>SOLUTION: The folding method is used with a punch press provided with a workpiece moving and positioning device 19 for freely moving and positioning the workpiece W with respect to dies 27, 29 at a working position. The method comprises: forming the rising part of the workpiece W; abutting the rising part on the upper die 27 stopped at the adequately lowered position; and folding the rising part at an acute angle. The punch press is provided with: the workpiece moving and positioning device 19 for freely moving and positioning the workpiece with respect to the dies 27, 29 at the working position; and a vertical position adjustable ram 13 disposed in a vertically movable manner, wherein a control device 45 for controlling a punch press is provided with: a lowering stop control unit 53 for controlling the lowering stop position of the ram; and a movement distance control unit 55 for freely controlling the movement distance after the rising part formed on the workpiece W is abutted on the upper die. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of bending a workpiece by a punch press such as a turret punch press and the punch press, and more particularly, after bending a rising portion by upper and lower molds in the punch press, The present invention relates to a bending method and a punch press capable of bending and hemming a rising portion at an acute angle.

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. Conventionally, as shown in FIG. 5, a die chip provided on the die so as 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 raising 109 (see, for example, Patent Document 1).
JP-A-6-15378

  In the configuration described in Patent Document 1, since the rising portion 107 is bent so as 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 further provided. It is difficult to bend and form the bent portion of the rising portion 107 at an acute angle, and further, hemming cannot be performed so as to crush the bent portion of the rising 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 structure including the workpiece movement positioning apparatus, after the rising portion is formed on the workpiece, the rising portion is brought into contact with an upper mold that is stopped at a position appropriately lowered from the highest position. This is a bending method by a punch press in which the rising portion is bent at an acute angle.

  According to a second aspect of the present invention, in the bending method according to the first aspect, after the rising portion of the workpiece is bent at an acute angle, the bent portion of the rising portion is processed to be crushed by upper and lower molds. And a bending method by a punch press that performs hemming.

  The invention according to claim 3 is provided with 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 can press the upper die freely. In a punch press comprising a ram whose vertical position is adjustable, the control device for controlling the punch press includes a lowering stop control unit for controlling the lowering stop position of the ram, A movement amount control unit capable of controlling the amount of movement after the rising portion formed on the workpiece comes into contact with the upper mold, and movement positioning for controlling the workpiece movement positioning device under the control of the movement amount control unit. And a control unit.

  According to the present invention, after bending the rising portion on the workpiece, it is easy to correct the spring back of the rising portion, bend the rising portion at an acute angle, and perform hemming, as described above. The conventional problem 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, since the mechanical configuration of the punch press may be a known configuration, in order to facilitate understanding, the case of the turret punch press will be exemplified and the main configuration will be schematically described.

  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 a direction (perpendicular to the paper surface in FIG. 1).

  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.

  In the case where the leading end of the rising part has a bending protrusion in a direction that is, for example, a direction perpendicular to the rising part, when the protruding direction of the bending protrusion is the rising direction of the rising part, Bending can be performed by bending the vicinity of the tip of the tongue-shaped portion upward and then bending the base of the tongue-shaped portion upward.

  However, when the protruding direction of the folding protrusion is opposite to the above, the vicinity of the tip of the tongue must be bent downward, and such bending is difficult. .

  Further, 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 and lower molds 5 and 9 are relatively moved up and down to bend the rising portion. This bending method corresponds to iron bending. Therefore, when the upper and lower molds 5 and 9 are engaged, the rising part of the workpiece can be bent at a right angle (perpendicular), but it is difficult to bend at a right angle with a spring back with high accuracy. It has been extremely difficult to perform a bending process or a hemming process at an acute angle between the workpiece W and the rising portion, depending on a conventional punch press.

  Therefore, in this embodiment, the upper and lower molds 27 and 29 as shown in FIG. 2 are employed as the upper and lower molds in the punch press. That is, the upper die 27 is provided with a punch 31 that is lowered by the lower pressure of the ram 13 in a punch press, and a lower end surface (tip surface) 31A of the punch 31 is movable up and down with respect to the lower die 29. A workpiece W is formed between the upper end surface (tip surface) 33 </ b> A of the ejector 33 provided for the workpiece 33 so as to be capable of gripping.

  The punch 31 is formed with a first workpiece regulating surface 31B perpendicular to the tip surface 31A adjacent to the tip surface 31A, and the upper end side of the first workpiece regulating surface 31B. A second work restricting surface 31C parallel to the tip surface 31A (perpendicular to the first work restricting surface 31B) is formed. Further, a third workpiece regulating surface 31D parallel to the first workpiece regulating surface 31B is formed adjacent to the tip side of the second workpiece regulating surface 31C.

  The lower mold 29 has a structure in which a die base 35 is provided with the ejector 33 so as to be movable up and down and a die 37, and the die 37 and the ejector 33 are in sliding contact with each other. The die 37 has a workpiece holding surface 37A that is formed on the side surface on the ejector 33 side so as to oppose a part of the tip end surface 31A of the punch 31 when the workpiece W is bent. The first, second, and third workpiece regulating surfaces 37B, 37C, and 37D that regulate the workpiece W facing the first, second, and third workpiece regulating surfaces 31B, 31C, and 31D of the punch 31 are as follows. The punch 31 is formed to correspond to the first, second and third workpiece regulating surfaces 31B, 31C and 31D.

  The ejector 33 is provided in sliding contact with the side surface of the die 37 so as to be movable up and down relatively, and is provided with an appropriate elastic member such as a coil spring provided in the die base 35. The biasing means 39 always biases upward. The upper end surface 33 </ b> A of the ejector 33 is normally held in a state where it coincides with the upper surface of the die 37.

  Therefore, when the upper and lower molds 27 and 29 are separated from each other in the vertical direction, the movement positioning device 19 in the punch press is controlled so that a part of the workpiece W is placed between the upper and lower molds 27 and 29. When the movement is positioned, the part of the workpiece W to be bent is positioned on the upper surfaces of the ejector 33 and the die 37 in the lower mold 29.

  After that, when the driving actuator 15 in the punch press is driven to lower the ram 13 and the punch 31 in the upper mold 27 is lowered, the upper mold 27 and the lower mold 29 cooperate to bend the workpiece W. Processing will be performed. At this time, the bent portion of the workpiece W includes the lower surface 31A of the punch 11, the first, second, and third workpiece regulating surfaces 31B, 31C, and 31D, and the workpiece clamping surface 37A, first, second, and second of the die 37. 3 is restricted and restrained by the workpiece regulating surfaces 37B, 37C, and 37D, and is bent as shown in FIG.

  That is, the workpiece W is bent at a right angle in the first, second, and third bent portions 41A, 41B, and 41C, and between the first bent portion 41A and the second bent portion 41B. The first rising portion 43A is provided, the second rising portion 43B is provided between the second bent portion 41B and the third bent portion 41C, and the bent protruding portion 43C protrudes from the third bent portion 41C. It is bent into the embodiment.

  Thereafter, when the upper mold 27 is raised relative to the lower mold 29 to release the grip of the workpiece W, the bent portion of the workpiece W is slightly returned by the spring back, and the accuracy of the bending angle is increased. Tend to decrease.

  Therefore, when correcting the bending angle of the first rising portion 43A, or when making the angle between the workpiece W and the first rising portion 43A an acute angle, as shown in FIG. The punch 31 is lowered to a height position in contact with the bent protrusion 43C, and the bent protrusion 43C is brought into contact with the punch 31 in the lowered state by controlling the movement of the work movement positioning device 19. By controlling the feeding of the workpiece W between the molds 27 and 29, the angle formed by the workpiece W and the rising portion 43A can be bent at an acute angle.

  As already described, as described above, the workpiece W and the rising portion 43A are controlled by controlling the feed amount of the workpiece W by directly or indirectly abutting the rising portion 43A of the workpiece W against the punch 31. Can be corrected to a right angle or bendable to a desired acute angle.

  Next, when performing the hemming process so that the rising portion 43A is in close contact with the workpiece W, after performing the bending process so that the angle A formed by the rising portion 43A and the workpiece W is an acute angle, As shown in FIG. 3B, by bending the first bent portion 41A so as to be sandwiched between the punch 31 and the ejector 33 so as to be crushed, as shown in FIG. Hemming is performed.

  That is, according to this embodiment, the rising portion of the workpiece W can be bent at an acute angle by a punch press, or hemming can be performed so that the rising portion is in close contact with the workpiece.

  In order to perform the bending process as described above, the control device (CNC control device) 45 for controlling the punch press 1 includes an input unit 47 for inputting a machining program and the like, and the inputted machining process. A program analysis unit 49 for analyzing the program is provided. This program analysis unit 49 is a process for performing only a bending process by the upper and lower molds 27, 29, a process for bending the rising part at an acute angle, and a process for performing a hemming process. It serves to analyze whether or not it exists.

  Further, the CNC device 45 includes a calculation unit 51. The calculation unit 51 feeds the workpiece W between the upper and lower molds 27, 29, the thickness of the workpiece W, the dimensions of the first and second workpiece regulating surfaces in the upper mold 27, and the lower mold 29. When the workpiece W is bent as shown in FIG. 2B based on the dimensions of the workpiece holding surface 37A and the first and second workpiece regulating surfaces 37B and 37C, the Y axis at the tip of the workpiece W The position in the direction (left-right direction in FIG. 2) is calculated.

  That is, when the workpiece W is bent by the upper and lower molds 27 and 29 when the workpiece W is fed in a small amount between the upper and lower molds 27 and 29, only the first rising portion 43A and the second When there is no rising portion 43B, the tip position of the work W is the position of the first rising portion 43A, and the second rising portion 43B is formed, but when the second rising portion 43B is short, the tip position of the work W is the bent portion. The position is between 41B and the bent portion 41C. And when the bending protrusion part 43C is formed, the front-end | tip position of the workpiece | work W turns into the position of the bending protrusion part 43C.

  Further, when the calculating means 51 folds the angle A formed by the first rising portion 43A and the workpiece W to an acute angle, the calculation means 51 determines the feed amount of the workpiece W after the tip of the workpiece W contacts the lowered punch 31. It is to calculate. That is, when only the first rising portion 43A is present in the workpiece W, the tip position of the workpiece W is the position of the first rising portion 43A, and the lower end portion of the punch 31 and the first rising portion 43A in a state of being lowered to a predetermined position. Are in contact with the punch 31, and the amount of workpiece W fed from the position where the first rising portion 43A is in contact (the amount of movement in the right direction in FIG. 3) is calculated corresponding to the angle A. Is.

  Further, when the tip position of the workpiece W is the position of the second rising portion 43B and the position of the bent protruding portion 43C, the workpiece tip contacts the punch 31 at the height position of the upper end portion of the first rising portion 43A. As the contact, the feed amount of the workpiece W from the position where the tip of the workpiece contacts the punch 31 is calculated corresponding to the angle A. Since the tip position of the workpiece W in the Y-axis direction is obtained in advance, the contact position between the workpiece tip and the punch 31 can be obtained in advance.

  The CNC control device 45 includes a descending stop control unit 53 for controlling the descending stop position of the ram 13 based on the analysis result of the program analyzing unit 49. When the analysis result of the program analysis unit 49 is a process of bending the rising part at an acute angle and a process of performing a hemming process, the descent stop control unit 53 cooperates with the upper and lower molds 27 and 29 to work the workpiece W. When the punch 31 is lowered again after releasing the workpiece W, the ram drive is performed so that the upper and lower molds 27 and 29 are lowered and stopped at a predetermined height position where they do not interfere with each other. The actuator 15 is controlled.

  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. Based on the calculation result of the calculation unit 51, the movement amount control unit 55 determines the movement of the workpiece after the tip of the workpiece W after being bent comes into contact with the punch 31 in a state where it is lowered and stopped at a predetermined position. The amount of movement of the device 19 is controlled.

  As already understood, when the workpiece W is bent by controlling the punch press 1 under the control of the CNC control unit 45, the analysis result of the program analysis unit 49 is a simple bending process. The ram driving actuator 15 is actuated to lower the punch 31 of the upper die 27, and the workpiece W is bent by the cooperation of the upper and lower dies 27 and 29 as shown in FIG. .

  When the analysis result of the program analysis unit 49 is a process of bending the rising part at an acute angle, as described above, the work 31 is bent by the cooperation of the upper and lower molds 27 and 29, and then the punch 31 is processed. Is lifted to release the workpiece W. Then, after the workpiece W is moved from the lower position of the punch 31 by the operation of the workpiece movement positioning device 19, the punch 31 is moved to a predetermined height position (the rising portion of the workpiece W is controlled) under the control of the descending stop control unit 53. It is lowered and stopped at the height position where it abuts.

  Thereafter, when the workpiece moving positioning device 19 is actuated to move the rising portion of the workpiece W in the direction in contact with the punch 31 and the tip of the workpiece W comes into contact with the punch 31, the angle A to bend the rising portion and the punch Based on the movement amount calculated in advance by the calculation unit 51 based on the contact position of the workpiece tip with respect to 31, the workpiece after the workpiece tip contacts the punch 31 under the control of the movement amount control unit 55. The movement amount of the workpiece movement positioning device 19 is controlled, and the rising portion of the workpiece W is bent at a desired angle A.

  When hemming is performed, the angle A is set to be small in advance, and the movement amount of the workpiece movement positioning device 19 is controlled so as to be the set angle A. After the rising portion is bent to a small set angle A, the punch 31 is raised once, and the bending portion 41A is positioned at a position below the punch 31 in the raised state, and then the ram driving actuator 15 performs punching. As shown in FIG. 3C, hemming is performed by crushing the bent portion 41A so that the rising portion comes into close contact with the workpiece W.

  As already understood, after the rising portion of the workpiece W is bent, the angle formed between the workpiece W and the rising portion can be processed to an acute angle, so that the spring back of the rising portion is corrected. It is also possible. In addition, it is easy to bend the rising portion at a desired angle and also can easily perform hemming.

It is explanatory drawing of the turret punch press as an example of a punch press. It is explanatory drawing of the bending process of an up-and-down metal mold | die and a workpiece | work. It is operation | movement explanatory drawing at the time of bending the rising part to an acute angle, and the case of performing hemming after bending a rising part to a workpiece | work. 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 standing part by the conventional metal mold | die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Punch press 27 Upper metal mold | die 29 Lower metal mold | die 31 Punch 31B-31D, 37B-37D Work control surface 33 Ejector 37 Die 37A Work holding surface 41A, 41B, 41C Bending part 43A, 43B Rising part 43C Bending protrusion part 45 CNC control device 53 Descent stop control unit 55 Movement amount control unit

Claims (3)

  After the rising part is formed and processed in the 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 bending method using a punch press, wherein the rising portion is brought into contact with an upper mold that is stopped at a position appropriately lowered from a position, and the rising portion is bent at an acute angle.   The bending method according to claim 1, wherein after the rising portion of the workpiece is bent at an acute angle, the bending portion of the rising portion is processed so as to be crushed by upper and lower molds, and hemming is performed. Folding method by a punch press that is characterized.   A ram that can move and position the workpiece relative to the upper and lower molds provided at the machining position, and that can move and position the workpiece relative to the X and Y axes. The control device for controlling the punch press includes a lowering stop control unit for controlling the lowering stop position of the ram, and a rising portion formed on the workpiece. A punch press comprising: a movement amount control unit capable of controlling a movement amount of the workpiece movement positioning device after coming into contact with the upper die.

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