JP5193887B2 - Punch press - Google Patents

Description

  The present invention relates to a punch press for punching a plate-shaped workpiece, and more specifically, a punch press having a function of detecting breakage of the punch when the workpiece is punched with a small-diameter punch. About.

  Conventionally, when laser processing is performed on a plate-shaped workpiece by a laser processing machine, piercing processing is first performed. Since this piercing process requires a relatively long time, in order to improve the efficiency, it has been proposed to perform punching in advance with a small-diameter punch at a position where the piercing process is performed in laser processing (see, for example, Patent Document 1). .

  As described above, when a workpiece is punched with a small-diameter punch, the punch is easily broken due to the small-diameter punch. Thus, it has been proposed to detect whether or not a punch breaks by detecting whether or not the workpiece has a punching hole after punching the workpiece with a punch (see, for example, Patent Documents 2 and 3).

JP-A-2-307628 JP 60-46824 A JP-A-7-51764

  The configurations described in Patent Documents 2 and 3 include an optical sensor in a movement area of a workpiece that is moved in the X and Y directions in a punch press, and whether or not a small-diameter hole is processed in the workpiece by the optical sensor. By detecting this, breakage of the punch is detected.

  Therefore, in a punch press having a function of ejecting oil mist during punching, there is a problem that the detection function of the optical sensor is likely to deteriorate. In addition, when an optical sensor is arranged at a position far away from the punching position so as not to be affected by oil mist, a dead zone in which the workpiece cannot be positioned with respect to the optical sensor may occur. Therefore, when a small-diameter hole is punched in the dead zone, there is a problem that it is impossible to detect whether or not the punch is broken during the processing of the small-diameter hole.

  The present invention has been made in view of the conventional problems as described above. The workpiece positioning means is capable of moving and positioning in the X and Y axis directions with respect to a punching position for punching a plate-like workpiece. A punch press provided with a workpiece gripping means capable of gripping the workpiece from above and below in order to hold the workpiece by the workpiece clamp. At least one presser member of the upper presser member that presses from above or the lower presser member that presses the work from below has an air ejection hole and an air passage in the other presser member, and the work is gripped by the upper and lower presser members When air is ejected from the air ejection hole at Is characterized in that by detecting the record has a hole detection means for detecting the presence or absence of holes in the workpiece.

  In the punch press, the air ejection hole is provided in an upper pressing member, and after air is ejected from the air ejection hole to the upper surface of the work, air is ejected from the air ejection hole to the upper surface of the work. However, the structure is characterized in that the upper surface of the workpiece can be pressed.

  In the punch press, the upper pressing member can be attached to and detached from the work gripping means, and an air pipe is connected to an outer peripheral surface of the upper pressing member.

  According to the present invention, the workpiece gripping means for pressing and gripping the workpiece from the up and down direction when the workpiece is held is provided with the air ejection hole, and whether or not the air from the air ejection hole has penetrated the hole of the workpiece. By detecting this, breakage of the punch is detected, so that no adverse influence is exerted even if the oil mist is ejected during punching.

  Further, since the workpiece gripping means is generally provided close to the punching position in the punch press, there is no dead zone area where the workpiece gripping means cannot grip the workpiece, and punching processing is performed. It is possible to detect punch breakage at an appropriate timing after performing the above.

It is plane explanatory drawing which showed the general punch press notionally and schematically. It is explanatory drawing which shows the structure of a workpiece | work holding means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, in order to facilitate understanding, an overall configuration of a punch press will be described.

  As shown in FIG. 1 conceptually and schematically in plan view, a turret punch press 1 as an example of a punch press has a punch P as an upper die and a die as a lower die, as is well known. Upper and lower turrets 3 and 5 having upper and lower sides (not shown) are rotatably provided. A ram (striker: not shown) that rotates the upper and lower turrets 3 and 5 and presses the punch P that is indexed and positioned at the punching position PA is provided so as to freely move up and down.

  A fixed table 7 that supports a plate-like workpiece W is provided on the front side in the X direction of the punching position PA (right side in FIG. 1). A movable table 9 is provided on both sides of the fixed table 7 in the Y direction. Is movably provided in the X-axis direction. The movable table 9 is integrally connected by a carriage base 11 that is long in the Y-axis direction. A carriage 15 having a plurality of work clamps 13 that can clamp the workpiece W is provided on the carriage base 11. It can be moved and positioned in the direction. As already known, the carriage base 11 and the carriage 15 constitute a workpiece positioning means 17 capable of moving and positioning the workpiece W in the X and Y axis directions with respect to the punching position PA.

  One end edge of the workpiece W in the X-axis direction is clamped by the workpiece clamp 13 in the workpiece positioning means 17, and the workpiece W is moved and positioned in the X and Y directions with respect to the punching processing position PA to punch the workpiece W. When the workpiece W is long in the Y-axis direction, punching may not be possible on the entire surface of the workpiece W with a single clamp by the workpiece clamp 13. Therefore, in the above case, after the workpiece W is moved and positioned in the Y-axis direction and fixed, the workpiece clamp 13 is released by the workpiece clamp 13 and the workpiece clamp 13 is returned to the original position. Clamping, that is, holding of the workpiece W is performed.

  As described above, the workpiece gripping means 19 is provided for gripping the workpiece W in a stationary state when the workpiece W is held. The workpiece gripping means 19 generally has a configuration in which a press pad is provided at the lower end of a piston rod that is movable up and down in an air cylinder mounted on the upper frame of the punch press 1. It is the structure which press-fixes to. The workpiece gripping means 19 is provided close to the punching position PA.

  Since the configuration as described above is a general configuration as a punch press, a detailed description of the configuration and operation of the punch press is omitted.

  By the way, if punching is performed on the workpiece W with a small-diameter punch provided in the punch press, the small-diameter punch is easily broken, so it is necessary to detect breakage of the punch. In addition, when performing piercing when performing laser machining on a plurality of locations on the workpiece W, it is important that small-diameter holes are reliably formed at a predetermined plurality of locations, and the small-diameter punch is broken. It is important to detect whether a small-diameter hole has been machined.

  Therefore, in this embodiment, the conventional work gripping means is improved so that the work gripping means can detect the presence or absence of a small-diameter hole, that is, the breakage of the small-diameter punch.

  Referring to FIG. 2, the work gripping means 21 in the punch press according to the embodiment of the present invention has a function capable of detecting whether or not the work W has a small-diameter hole H punched out. In addition, since the whole structure of a punch press may be the same as the structure of the conventional punch press, detailed description about the whole structure of a punch press is abbreviate | omitted.

  Now, referring to FIG. 2, the workpiece gripping means 21 according to the embodiment of the present invention includes a vertical movement actuator 27 such as an air cylinder mounted on an upper frame 23 of a punch press via a bracket 25. An upper presser member 31 such as a pad is detachably attached to a lower end portion of a vertical operation rod 29 such as a piston rod provided to the vertical movement actuator 27 so as to be movable up and down. An air ejection hole 35 communicating with the internal space 33 of the upper pressing member 31 is formed at the center of the lower surface of the upper pressing member 31.

  In order to eject air downward from the air ejection hole 35, an air pipe 37 having one end communicating with the internal space 33 is connected to the outer peripheral surface of the upper pressing member 31. The other end of the air pipe 37 is connected to an air pressure source (not shown), and the air flow or pressure rise in the air pipe 37 is detected in the middle of the air pipe 37 to detect the workpiece W. In order to detect the presence or absence of the small-diameter hole H, a hole detecting means 39 such as a flow rate sensor or a pressure sensor is provided.

  A lower pressing member 41 for pressing the workpiece W from below is provided at a position below the upper pressing member 31 so as to be movable up and down. More specifically, a vertical movement actuator 45 such as an air cylinder facing the vertical movement actuator 27 is arranged below a table 43 (corresponding to the fixed table 7) 43 that movably supports the workpiece W. The lower pressing member 41 is detachably provided at the upper end portion of the vertical operation rod 47 in the vertical movement actuator 45.

  The lower presser member 41 abuts and supports the lower surface of the workpiece W by moving up from the normal lowered position to the height position of the pass line of the workpiece W. An air passage 49 having an opening in the part is provided.

  In the configuration as described above, the workpiece W is clamped by the workpiece clamp 13 in the workpiece positioning means 17 and moved and positioned in the X and Y axis directions with respect to the punching processing position PA. Hole punching is performed. As described above, after the punching of the small diameter holes, that is, after the punching of all the small diameter holes, or at the end of the preset number of the small diameter holes, or the punching of the small diameter holes is performed. In order to detect the breakage of the small-diameter punch every time, that is, to detect the presence or absence of the small-diameter hole, the following is performed.

  That is, the position where the workpiece W was last punched by the small diameter punch is positioned to the position of the workpiece gripping means 21. Then, the lower pressing member 41 provided in the workpiece gripping means 21 is raised to the height position of the pass line of the workpiece W to support the lower surface of the workpiece W, and then the upper pressing member 31 is lowered to lower the upper surface of the workpiece W. When pressing, air is ejected from the air ejection hole 35 provided in the upper presser member 31 and the part to be pressed of the work W is blown away, for example, dust is cleaned, or the air is ejected from the air ejection hole 35. The spout or the like, that is, the part to be pressed is cleaned and descends, and the work W is pressed and gripped in the vertical direction so as to face the lower pressing member 41.

  As described above, when the workpiece W is pressed and held by the upper and lower presser members 31 and 41, the upper surface of the work W is cleaned by the air jetted from the air jetting hole 35 of the upper presser member 31. Even if there is a punched debris on the upper surface of the workpiece W, or even if there is a chip when tapping is performed, the punched debris or chips are blown away, The upper and lower presser members 31 and 41 are pressed and held while being in close contact with the upper and lower surfaces of the work W.

  As described above, when air is ejected from the air ejection holes 35 of the upper presser member 31 when the upper and lower presser members 31 and 41 are pressed and gripped by the upper and lower presser members 31 and 41, the small diameter hole H is processed in the work W. In the case of air flow, air flows through the small-diameter hole H and the air passage 49 of the lower holding member 41, so that the hole detection means 39 detects that the air flow or the air pressure does not rise above a predetermined pressure. By doing so, it can be detected that the small diameter hole H exists in the workpiece W and the small diameter punch is not broken.

  Conversely, when the air flow cannot be detected by the hole detection means 39 in a state where the workpiece W is gripped by the upper and lower pressing members 31, 41, or when it is detected that the air pressure has become a predetermined pressure or more. Can be detected that the small-diameter hole H is not punched in the workpiece W, that is, the small-diameter punch is broken.

  As understood from the above description, in the state where the workpiece W is gripped by the upper and lower pressing members 31, 41 in the workpiece gripping means 21, the air generated by ejecting air from the air ejection hole 35 of the upper pressing member 31. Even if the oil mist is ejected at the time of punching, it is detected whether or not the small diameter hole H has been punched into the workpiece W by detecting a flow or an increase in air pressure over a predetermined pressure. The oil mist is not adversely affected by the ejection.

  Further, when the workpiece W is gripped by the upper and lower pressing members 31, 41, for example, the workpiece W is gripped after being cleaned by blowing away dust or the like adhering to the workpiece W. Therefore, the workpiece W and the upper pressing member 31 are held. No dust or the like is interposed between the upper presser member 31 and the work W, and the presence of the small-diameter hole H is accurately detected. It is something that can be done.

  Further, since the upper pressing member 31 in the workpiece gripping means 21 is detachable and the air pipe 37 is connected to the outer peripheral surface of the upper pressing member 31, it is retrofitted to the workpiece gripping means in the conventional punch press. It can be implemented.

  Furthermore, since the workpiece gripping means 21 close to the punching position PA is configured to detect the small-diameter hole H of the workpiece W, the workpiece can be processed without machining the small-diameter hole H at a limited specific position of the workpiece W. Immediately after processing the small-diameter hole H at a place where W is required, the position of the small-diameter hole H can be positioned to the position of the work gripping means 21 to detect the presence or absence of the small-diameter hole H. Therefore, even when the presence of the small-diameter hole H is confirmed every time the small-diameter hole H is punched into the workpiece W a predetermined number of times, a reduction in the efficiency of the punching process can be suppressed. In other words, the breakage of the small-diameter punch can be detected quickly, and the occurrence of defective products can be suppressed.

  The present invention is not limited to the embodiment described above, and can be implemented in other forms by making appropriate changes. That is, in the above description, the case where air is ejected from the upper presser member 31 has been described, but it is also possible to adopt a configuration in which air is ejected from the lower presser member 41 upside down.

13 Work clamp 17 Work positioning means 19 Work gripping means 21 Work gripping means 31 Upper presser member 35 Air ejection hole 37 Air piping 39 Hole detection means 41 Lower presser member 49 Air passage

Claims (3)

  A workpiece positioning means that can be moved and positioned in the X and Y axis directions with respect to a punching position for punching a plate-like workpiece is provided with a workpiece clamp that can clamp the workpiece, and the workpiece clamp is used to change the workpiece. A punch press provided with a workpiece gripping means capable of gripping the workpiece from above and below in order to perform at least an upper pressing member for pressing the workpiece from above or a lower pressing member for pressing the workpiece from below. One presser member is provided with an air ejection hole and the other presser member is provided with an air passage, and when air is ejected from the air ejection hole in a state where a workpiece is gripped by the upper and lower presser members, an increase in air pressure or Hole detection to detect the presence of holes in the workpiece by detecting the air flow Punch press, characterized by comprising a stage.   2. The punch press according to claim 1, wherein the air ejection hole is provided in an upper pressing member, and air is ejected from the air ejection hole to the upper surface of the work or from the air ejection hole to the upper surface of the work. A punch press characterized in that the upper surface of the workpiece is pressed while spraying.   3. The punch press according to claim 2, wherein the upper pressing member is detachable from the work gripping means, and an air pipe is connected to an outer peripheral surface of the upper pressing member.

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