JP5277024B2 - Die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die which is directly abutted on a punch to position the origin, as the die wherein a thick plate is an object to be bent. <P>SOLUTION: This invention relates to the die 1 constituted so that inclined smooth workpiece contact surfaces 11A, 11B which come in contact with a workpiece W when folding the plate-like workpiece W are provided on an upper part of a V-groove 9 provided on a die body 3 in a manner of projecting in the V-groove 9. A V-shaped punch fore end abutting surface 15 for abutting the punch fore end thereon is provided on a bottom part of the V-shaped groove 9. Inclined surfaces 15A, 15B on the punch fore end abutting surface 15 are formed on inclined surfaces 17A, 17B on the same plane as the workpiece contact surfaces 11A, 11B. The hardness of the punch fore end abutting surface 15 is lower than that of the workpiece contact surfaces 11A, 11B. The width of the inclined surfaces 15A, 15B on the punch fore end abutting surface 15 is smaller than that of the workpiece contact surfaces 11A, 11B. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a die. More specifically, the present invention relates to a die for bending a thick plate having a plate thickness of about 3.0 mm to 12.0 mm. The present invention relates to a die having a punch tip abutting surface for abutting the tip of a punch when positioning the origin of a die (punch, die).

  When a plate-like workpiece is bent by a press brake equipped with upper and lower molds (punch, die), the punch relative to the die is detected in order to detect the pushing amount of the workpiece into the V groove provided in the die. The position is detected. By the way, it is detected that the lower end of the punch is in contact with the upper surface of the work placed on the die, and the work is bent by pushing the work into the V groove of the die with reference to the contact position. There is. In bending work of the press brake, the bending of the press brake frame must be taken into account, so in order to perform more accurate bending work, in order to control the relative position of the punch with respect to the die, It is necessary to set the origin positions of the punch and die in advance in consideration of the frame deflection (distortion) in the press brake.

  Therefore, the punch and die engagement positions in the state in which the pressurization is performed in a state where the punch and the die are engaged and a predetermined deflection (distortion) is generated in the press brake frame in advance are used as the origin positions of the punch and the die. Things have been done. However, the above method is a case of a punch or die used when a plate-like workpiece to be bent is thin (a plate material of 3.0 mm or less). Although the inclined surface of the V-groove in the die for bending a thin plate is ground over the entire surface, the die for bending a thick plate is not limited to the size of the die itself. In consideration of improving the machining accuracy of the groove and ease of machining, etc., the V-groove has a smooth workpiece contact surface, and a relief is formed below the workpiece contact surface. is there. Therefore, the origin position cannot be set by engaging the tip of the punch with the bottom of the V groove in the die.

  However, since it is necessary to set the origin position by engaging the upper and lower dies as the press brake becomes more NC, a jig for setting the origin position has been proposed (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 57-189618

  In the configuration described in Patent Document 1, a jig having a small V groove on the upper surface is engaged with a V groove in a die intended for a thick plate, and the bottom of the V groove of the die and the V of the jig are engaged. The bottom of the groove is set so as to coincide with the same vertical plane, the punch tip is engaged with the V groove of the jig, and the engaged position is used as a temporary origin for correction. Therefore, there is a problem that jig management is troublesome and correction is troublesome.

  The present invention has been made in view of the conventional problems as described above, and an inclined smooth workpiece contact surface that comes into contact with a workpiece at the time of bending a plate-shaped workpiece is formed on the upper portion of the V groove provided in the die body. A die provided so as to protrude into the V-groove, comprising a V-shaped punch tip contact surface for contacting the punch tip at the bottom of the V groove, and an inclined surface of the punch tip contact surface is The inclined surface is coplanar with the workpiece contact surface.

  In the die, the hardness of the punch tip contact surface is smaller than the hardness of the workpiece contact surface.

  The die is characterized in that the width dimension of the inclined surface on the punch tip contact surface is smaller than the width dimension of the workpiece contact surface.

  According to the present invention, the origin position can be set by directly abutting the punch tip against the punch tip contact surface provided at the bottom of the V groove in the die body. Therefore, the conventional problems as described above can be solved.

It is explanatory drawing which shows the engagement state of the die | dye which concerns on embodiment of this invention, and the said die | dye and a punch.

  Referring to FIG. 1, a die 1 according to an embodiment of the present invention is attached to a lower table (not shown) in a press brake and used for bending a thick plate. I have. The lower surface of the die body 3 is provided with a lower table in a press brake or a mounting portion 5 to a die support member (not shown) attached to the lower table, and a work W which is a thick plate is placed and supported on the upper surface. The upper surface 7 is formed horizontally. A V-groove 9 for bending the workpiece W into a V shape in cooperation with the punch P is formed on the upper surface of the die body 3.

  A pair of smooth and smooth workpiece contact surfaces 11A and 11B that come into contact with the workpiece W when the workpiece W is bent are formed symmetrically on the V groove 9. The upper edges of the workpiece contact surfaces 11A and 11B are connected to the upper surface 7. Recessed portions 13 that are recessed by connecting to the lower edges of the workpiece contact surfaces 11A and 11B are formed below the workpiece contact surfaces 11A and 11B, that is, on the bottom side of the V groove 9 respectively. Accordingly, the workpiece contact surfaces 11A and 11B are in a form that relatively protrudes into the V-groove 9 by forming the escape portion 13.

  A punch tip contact surface 15 for directly contacting the tip of the punch P is formed in a V shape at the bottom of the V groove 9. One inclined surface 15A of the punch tip contact surface 15 is formed on the inclined surface of the same plane 17A as the one workpiece contact surface 11A, and the other inclined surface 15B is formed with the other workpiece contact surface 11B. It is formed on the inclined surface of the same plane 17B.

  The workpiece contact surfaces 11A and 11B are subjected to a surface treatment such as quenching in order to improve wear resistance. The hardness of the workpiece contact surfaces 11A and 11B is greater than the hardness of the punch tip contact surface 15. Is also larger. The workpiece contact surfaces 11A and 11B and the punch tip contact surface (a surface including the inclined surfaces 15A and 15B) 15 are each formed into a smooth inclined surface by grinding. The width dimensions in the inclined direction of the workpiece contact surfaces 11A and 11B are set so that the grinding process during the grinding process is easy and the contact area with the workpiece W is increased. 15 is formed to be larger than the width dimension of the inclined surfaces 15A and 15B in the inclined direction.

  Prior to bending the thick plate (3.0 mm to 12.0 mm plate) by mounting the punch P on the upper table in the press brake and mounting the die body 3 on the lower table in the above configuration, The tip portion (lower end portion) of the punch P is directly contacted and engaged with the V-shaped punch tip contact surface 15 provided at the bottom of the V groove 9 in the die body 3 to perform a predetermined addition when positioning the origin. In this state, the punch P and the die 1 are detected by detecting the relative position of the punch P with respect to the die 1 by an appropriate position detection device such as a linear encoder. It is possible to perform the origin positioning in a state where the is engaged and pressurized.

  As can be understood from the above description, the origin position is determined by directly contacting the tip of the punch P against the V-shaped punch tip contact surface 15 provided at the bottom of the V groove 9 in the die body 3. Therefore, even if the shape of the tip portion of the punch P is different, for example, the origin positioning can be easily performed.

  In the die body 3, the hardness of the workpiece contact surfaces 11A and 11B formed at the upper part of the V groove 9 is made larger than the hardness of the V-shaped punch tip contact surface 15 formed at the bottom of the V groove 9. Therefore, for example, when using a tempered material that has been tempered in advance as the base material of the die body 3, it is sufficient to perform a process such as quenching only the parts of the workpiece contact surfaces 11A and 11B. Is easy.

  Further, the inclined surfaces 15A and 15B of the workpiece contact surfaces 11A and 11B and the punch tip contact surface 15 are on the same inclined planes 17A and 17B, and moreover than the width dimension in the inclined direction of the workpiece contact surfaces 11A and 11B. The widths in the inclination direction of the inclined surfaces 15A and 15B of the punch tip contact surface 15 are formed small. Therefore, for example, when the workpiece contact surfaces 11A and 11B and the inclined surfaces 15A and 15B of the punch tip contact surface 15 are simultaneously ground with an abacus ball-shaped rotary grinding tool, the entire surfaces of the inclined planes 17A and 17B are ground. Needless to say, the load is smaller than in the case of carrying out, and the grinding load at the portion where the diameter from the rotation axis of the grinding tool is large and gradually becomes thinner can be suppressed to be small.

DESCRIPTION OF SYMBOLS 1 Die 3 Die main body 5 Mounting part 7 Upper surface 9 V groove 11A, 11B Workpiece contact surface 13 Escape part 15 Punch tip contact surface 15A, 15B Inclined surface 17A, 17B Plane

Claims (3)

  A die having an inclined smooth workpiece contact surface that comes into contact with a workpiece during bending of a plate-shaped workpiece on the upper portion of the V-shaped groove provided in the die body. The bottom is provided with a V-shaped punch tip contact surface for contacting the punch tip, and the inclined surface of the punch tip contact surface is formed on the same inclined surface as the workpiece contact surface. Feature die.   2. The die according to claim 1, wherein the hardness of the punch tip contact surface is smaller than the hardness of the workpiece contact surface.   3. The die according to claim 1, wherein the width dimension of the inclined surface on the punch tip contact surface is smaller than the width dimension of the workpiece contact surface.

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