JP2006289413A - Method for preventing climb of slug to punch press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preventing the climb of slag by controlling the climbing speed of a punch and a ram, and to provide a punch press. <P>SOLUTION: In the method for preventing the climb of slug upon punching a planar workpiece W by a punch 3 and a die 5 provided at a punch press 1, when the workpiece W is punched by the punch 3, and the punch 3 is made to climb from the vicinity of the bottom dead point position, in such a manner that, after the adhesion between the slug punched by the punch 3 and the lower edge face of the punch 3 is released, the lower edge face of the punch 3 is pulled out from the upper face of the workpiece W, the climbing speed in the lower edge face of the punch 3 from the vicinity of the bottom dead point position to the vicinity of the upper face of the workpiece is controlled. When the punch 3 is made to climb from the vicinity of the bottom dead point position, in the vicinity of the bottom dead point position, the climb of the punch 3 is temporarily stopped or the climbing speed is temporarily reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a punch press, and more specifically, a method and a punch press for preventing a punched piece from climbing (up) to a top surface of a workpiece when punching a plate-shaped workpiece with a punch and a die. About.

  Conventionally, when punching a plate-like workpiece by a punch press, the speed pattern of the punch and ram is controlled by an operation pattern as shown in FIG. 1, for example (see Patent Document 1).

  That is, from the top dead center position Z1 of the punch to the position Z2 close to the upper surface WU of the workpiece W, the punch is moved down at a high speed V1, and workpiece punching is started at the speed V2 decelerated at the position Z2. Thereafter, the speed is increased at a position Z3 below the upper surface WU of the work W by a predetermined distance, and reaches a bottom dead center position Z4 below the lower surface WL of the work W at a speed V3. Ascending to the dead center position Z1 at a speed V4.

  As described above, decelerating to the speed V2 at the position Z2 and rapidly increasing from the bottom dead center position Z4 to the top dead center position Z1 at the speed V4 is desirable in terms of suppressing vibration and noise and improving the machining efficiency. It is.

  However, when the punch is raised at a speed V4 from the bottom dead center position Z4, a negative pressure is generated between the lower end surface of the punch that is in close contact with the punched piece (punched residue) punched from the workpiece, and the punch is lifted. The punched piece may rise on the upper surface of the workpiece following the movement of the workpiece and cause a residue rise.

  If the workpiece punching process is continued in the state in which the above-mentioned residue rises, the punched piece may enter between the punch and the die, which increases the load and damages the punch and die or damages the punch press itself. Sometimes.

Therefore, conventionally, for example, as shown in Patent Document 2 or the like, a configuration in which an air injection port is provided in the die and air is injected to the lower end portion of the punch at the bottom dead center position is adopted. In this configuration, there is a problem that the configuration becomes more complicated, for example, it is necessary to perform special processing on the die and to provide a blower for air injection.
JP-A-1-148498 JP-A-4-313427

  The present invention has been made in view of the problems as described above, and can prevent the residue from rising by controlling the ascent speed of the punch and ram in the punch press without performing special processing on the die or the like. It is to provide a method and a punch press.

  In view of the conventional problems as described above, the invention according to claim 1 is a method for preventing dregling when a plate-shaped workpiece is punched by a punch and die provided in a punch press, When the workpiece is punched and the punch is raised from near the bottom dead center position, the lower end surface of the punch is released from the upper surface of the workpiece after the close contact between the punched residue punched by the punch and the lower end surface of the punch is released. A punch press dregs-up prevention method that controls the ascending speed of the punch from which the lower end surface extends from the vicinity of the bottom dead center position to the vicinity of the upper surface of the workpiece so as to be extracted.

  According to a second aspect of the present invention, when the punch is lifted from the vicinity of the bottom dead center position in the method of preventing punch dregs of the punch press according to the first aspect, the lift of the punch is temporarily stopped or raised near the bottom dead center position. This is a method for preventing dregs of a punch press that temporarily decelerates the speed.

  According to a third aspect of the present invention, there is provided a punch press comprising a punch and a die for punching a plate-like workpiece, and a ram for moving the punch up and down, wherein the ram is moved up and down. A ram driving means for moving, a ram lowering position detecting means for detecting that the ram has reached the vicinity of the bottom dead center position, and when the ram is raised based on detection by the ram lowering position detecting means, the punch And a rising speed control means for controlling the rising speed of the punch from the vicinity of the bottom dead center position to the vicinity of the upper surface of the workpiece.

  According to the present invention, by appropriately controlling the rising speed of the punch while the lower end surface of the punch after the workpiece is punched out from the upper surface of the workpiece without performing special processing on the punch and die. Thus, it is possible to effectively prevent dregs as in the prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. A punch press 1 according to an embodiment of the present invention is formed by punching a plate-shaped workpiece W as schematically and schematically shown in FIG. A punch 3 for processing is provided so as to be movable up and down, and a die 5 as a female die that cooperates with the punch 3 is provided. And the ram drive means 9 for moving up and down the ram 7 which moves the punch 3 up and down is provided.

  This type of punch press 1 is known as, for example, a turret punch press, and the ram driving means 9 for moving the ram 7 up and down is well known as a crank mechanism rotated by, for example, a hydraulic cylinder or a servo motor. Therefore, a more detailed description of the punch press 1 is omitted.

  A ram descending position detecting means is provided for detecting that the ram 7 which can move up and down has reached the vicinity of the bottom dead center position. As the ram descending position detecting means, it is possible to adopt a configuration such as a limit switch or a proximity sensor that is activated when the ram 7 or the punch 3 reaches the bottom dead center position or near the bottom dead center position. In this example, a ram position detection device 11 for detecting the vertical movement position of the ram 11 is provided.

  The ram position detection device 11 is exemplified by a linear sensor that directly detects the position of the ram 7, but the ram drive means 9 is an eccentric shaft rotated by a motor or a link mechanism reciprocated by the rotation of a screw. When the configuration in which the ram 7 is moved up and down is adopted, a configuration in which the position of the ram 7 is indirectly detected by detecting the rotational position of the eccentric shaft or screw may be employed.

  Control means 13 is provided for controlling the ram driving means 9 to control the vertical movement of the ram 7. The control means 13 corresponds to, for example, a CNC device that controls the overall operation of the punch press 1. The control means 13 includes the ram position detection device 11 that causes the ram 7 to be at the bottom dead center position or the bottom dead center. After detecting that the vicinity of the point position has been reached, when the ram 7 is raised and returned from the vicinity of the bottom dead center position to the vicinity of the top dead center position or an appropriate height position between the top dead center position and the upper surface of the workpiece W Further, a rising speed control means 15 for controlling the rising speed of the ram 7 is provided.

  The ascending speed control means 15 performs punching of the workpiece W by the punch 3, and when the punch 3 is lifted from the vicinity of the bottom dead center position, the punched piece (punched waste) punched by the punch 3 and the punch 3 is released from the bottom dead center position of the punch 3 (ram 7) so that the lower end surface of the punch 3 is extracted from the upper surface of the workpiece W after the close contact state with the lower end surface of the workpiece 3 is released. The rising speed of the lower end surface of the punch 3 reaching the vicinity is controlled.

  That is, in other words, while the lower end surface of the punch 3 rises from the descending end where the workpiece W is punched or near the descending end to the vicinity of the upper surface of the workpiece W, the lower end surface of the punch 3 and the punching residue The ascending speed of the punch 3 and the ram 7 is controlled so that the air does not enter and the punching dregs do not rise following the rise of the punch 3.

  In the above-described configuration, under the control of the control means 13, the head descends from the top dead center position Z1 to the position Z2 near the upper surface of the work W at the speed V1, decelerates to the speed V2 at the position Z2, and then the upper surface of the work W. Is increased to a speed V3 at a predetermined position Z3 and then lowered, and when the punch 3 reaches the bottom dead center position Z4, it returns to the top dead center position Z1 at a speed V4 to thereby return the conventional operation pattern described above. The vertical movement of the ram 7 and the punch 3 can be controlled with the same operation pattern.

  As described above, when the punch 3 is raised at a high speed from the bottom dead center position Z4 at the speed V4, the punched residue may rise to the upper surface of the workpiece W following the rise of the punch 3.

  Therefore, in this example, the punching process of the workpiece W is performed, and the ram position indicates that the punch 3 has reached the bottom dead center position Z4 or near the bottom dead center position (near the descending end) where the workpiece W has been punched. When detected by the detection device 11 and the detection signal is input to the control means 13, the ram drive means 9 is temporarily stopped under the control of the ascent speed control means 15, and the ascent of the punch 3 is stopped for a predetermined time T1. (Climbing speed 0). In this case, a timer can be used as the ascending speed control means 15.

  The predetermined time T1 is a time during which air enters between the lower end surface of the punch 3 and the punched piece and the close contact state between the lower end surface and the punched piece is released. After the elapse of the predetermined time T1, from the bottom dead center position Z5 (shown in place of the position Z4 in order to indicate the passage of time) or the vicinity of the bottom dead center position, the increase is faster than the increase speed V4 in the conventional operation pattern. By raising and returning the ram 7 (punch 3) at the speed V5, it is possible to prevent the punching residue from rising following the rise of the punch 3, and the workpiece is punched in the same cycle time as the conventional operation pattern. It is something that can be done. That is, it is possible to effectively prevent dregs up without lowering the machining efficiency.

  Note that the position where the ram 7 is raised and returned is near the top dead center position or the appropriate height position. Thus, the efficiency can be further improved by appropriately setting the rising return position of the ram 7 to the height position.

  As already understood, after releasing the contact state between the lower end surface of the punch 3 and the punched debris, the punch 3 is lifted and returned from the top dead center (rising end) or its vicinity or the upper surface of the workpiece W to an appropriate height position. By doing so, it is possible to prevent the residue from rising. Therefore, in short, when the punch 3 is raised, the raising speed of the punch 3 is controlled so as to release the contact state between the lower end surface of the punch 3 and the punched piece until the lower end surface of the punch 3 reaches the vicinity of the upper surface of the workpiece W. What should I do?

  Therefore, without stopping the punch 3 near the bottom dead center position Z4 or near the bottom dead center position of the punch 3, for example, as shown by the speed V6, a low speed increase may be started near the bottom dead center position Z4. The ascending speed from the bottom dead center position Z4 or near the bottom dead center position is the same as the conventional speed V4, and is decelerated to the speed V7 while the lower end surface of the punch 3 is pulled out from the upper surface of the workpiece W. It is also possible to control the rising speed near the bottom dead center position to an arbitrary speed so that the close contact state between the lower end face of the punch 3 and the punched piece is released before the end face comes out from the upper surface of the workpiece W. Is.

  Note that the rising speed after the punch 3 near the bottom dead center position is controlled to release the close contact between the lower end surface of the punch 3 and the punched piece is not controlled by the rising speed V5. The rising speed V4 in the above operation pattern may be controlled, or it may be controlled to a lower rising speed.

  As can be understood from the above description, according to this example, after the punch 3 reaches the bottom dead center position Z4 or near the bottom dead center position, the rising speed of the punch 3 near the bottom dead center position is controlled. Then, after releasing the close contact state between the lower end surface of the punch 3 and the punched piece, the lower end surface of the punch 3 is extracted from the upper surface of the workpiece. Therefore, it is possible to effectively prevent dregs as in the conventional case.

It is operation | movement explanatory drawing which shows the operation | movement of the vertical motion of the punch and ram in a punch press. It is a conceptual and schematic explanatory drawing of a punch press for controlling up and down movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Punch press 3 ... Punch 5 ... Die 7 ... Ram 9 ... Ram drive means 11 ... Ram position detection apparatus 13 ... Control means 15 ... Ascent speed control means

Claims (3)

  A method for preventing dregling when a plate-shaped workpiece is punched by a punch and a die provided for a punch press, wherein the workpiece is punched by the punch and the punch is lifted from the vicinity of a bottom dead center position. The lower end surface of the workpiece is removed from the position of the bottom dead center so that the lower end surface of the punch is extracted from the upper surface of the workpiece after the close contact between the punching residue punched by the punch and the lower end surface of the punch is released. A method for preventing dregs of a punch press, characterized by controlling the ascent rate of the punch reaching the upper surface.   2. The punch press dregs prevention method according to claim 1, wherein when the punch is lifted from near the bottom dead center position, the lift of the punch is temporarily stopped or the lift speed is temporarily decelerated near the bottom dead center position. A method for preventing dregs of a punch press.   A ram driving means for moving the ram up and down in a punch press provided with a punch and die for punching a plate-like workpiece and having a ram for moving the punch up and down. Ram lowering position detecting means for detecting that the ram has reached the vicinity of the bottom dead center position, and when raising the ram based on the detection by the ram lowering position detecting means, the lower end surface of the punch is the bottom dead center A punch press comprising: an ascent speed control means for controlling an ascent speed of the punch from near the position to near the upper surface of the workpiece.

Images