JP2014094394A - Metal mold for outrunning processing and outrunning processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal mold for outrunning processing and an outrunning processing method, capable of shortly shearing a scrap generated in outrunning processing of a work.SOLUTION: The metal mold for the outrunning processing comprises a punch metal mold 1 and a die metal mold 15. The punch metal mold 1 has a punch blade part 5 having a cross-sectional shape in a rectangular shape at a lower part of a punch body 3 and projecting in the lower direction. The die metal mold 15 has a die hole 19 in a rectangular shape corresponding to the cross-sectional shape of the punch blade part 5. A tip part of the punch blade part 5 is provided with a step height part 7 in the vertical direction and thereby provided with a projection shearing blade 9 and a preforming shearing blade 11. The preforming shearing blade 11 is provided with a molding shearing blade 13 projecting in the lower direction, for forming a separation position sheared and separated by the projection shearing blade 9.

Description

  The present invention relates to a punching die and a punching method for punching a plate-shaped workpiece, and more specifically, shearing a portion (scrap) cut and separated from the workpiece during the punching of the workpiece. The present invention relates to a die for overtaking and a method for overtaking.

  Conventionally, when performing a punching process for a plate-shaped workpiece, every time the workpiece is punched, a fine plastic deformation occurs on the surface of the workpiece, which causes a problem in improving the appearance. In view of this, there has been proposed an additional punching method that suppresses the occurrence of the plastic deformation by repeating punching to the middle of the punch blade using a punch having an inclined punch blade.

  In the above-described punching method, there is a new problem that a portion that is cut and separated from a workpiece and becomes scrap is generated for a long time. In order to solve such a problem, there has been proposed a punching die for cutting a scrap generated every time a workpiece is punched (for example, see Patent Document 1).

JP-A-6-297053

  The punching die described in Patent Document 1 has a configuration as shown in FIG. That is, the punching die is provided with a punch 101 and a die 103. The punch 101 includes a blade body 105 having a rectangular cross-sectional shape. A punching blade 105A and a cutting blade 105B, both of which are inclined, are provided at the tip (lower end) of the blade body 105. I have. The widths A and B of the punching blade portion 105A and the cutting blade portion 105B are substantially equal, and a step portion 107 is formed between the punching blade portion 105A and the cutting blade portion 105B. It is.

  The die 103 includes a slit-shaped recess 103B adjacent to the punching through hole 103A corresponding to the punching blade 105A of the punch 101. The incision recess 103B is a portion corresponding to the incision blade portion 105B of the punch 101, but is sufficiently longer than the width dimension B of the incision blade portion 105B. The bottom wall 109 of the notch recess 103B is provided with a cutting edge 109A corresponding to the step 107.

  5A, after positioning the workpiece W on the die 103 as shown in FIG. 5A, the punch 101 is lowered and punching of the workpiece W is performed as shown in FIG. The scrap S1 is punched by the punching blade portion 105A of the punch 101, and is cut and separated by the cooperation of the cutting edge 109A and the step portion 107. The continuous portion S2 continuous to the scrap S1 is punched by the cutting blade portion 105B of the punch 101, but is not cut and separated from the workpiece W, but is inclined in the cutting recess 103B of the die 103. It is in a state (see FIGS. 5B and 5C).

  Thereafter, the workpiece W is moved so that the continuous portion S2 of the workpiece W is positioned in the punching through hole 103A of the die 103 (see FIG. 5D), and then the punch 101 is lowered to punch the workpiece W. As a result, new scrap S1 and continuous portion S2 are processed (see FIG. 5E). That is, the workpiece W is additionally punched by repeatedly punching the scrap S1 and the continuous portion S2 one after another from the workpiece W.

  Therefore, as shown in FIG. 5F, the punch 101 and the die 103 configured as described above have a problem that the continuous portion S2 remains in the final process, and a cutting edge is formed at the bottom of the cutting recess 103B in the die 103. There is a problem that the bottom wall 109 provided with 109A is required and the configuration of the die 103 is complicated.

  The present invention has been made in view of the above-described problems, and is a punching die having a punch die and a die die, and the punch die has a cross-sectional shape at a lower portion of a punch body. A rectangular punch blade portion is provided projecting downward, and the die mold is provided with a rectangular die hole corresponding to the cross-sectional shape of the punch blade portion. A projecting shear blade and a pre-formed shear blade by providing a stepped portion in the direction, and a forming shear blade for forming a separation position sheared by the projecting shear blade in the pre-formed shear blade in a downward direction It is provided with a protrusion.

  In the punching die, the forming shear blade is formed in a triangular shape protruding downward, and the apex angle of the triangular portion is an obtuse angle and higher than the lower surface of the protruding shear blade It is characterized by being located.

  And a punching method using the punching die, wherein a portion to be cut and separated from the plate-like workpiece is positioned at a position corresponding to the protruding shearing blade, and the punching die (B) a step of shallowly engaging a punch blade portion in a die with a die hole in the die die, and cutting and separating the portion to be cut and separated, and the preforming shear in the punch die during the step (b) (C) a step of forming the workpiece part corresponding to the blade by half-cutting and forming a shape protruding downward; and positioning the half-cut part at a position corresponding to the protruding shearing blade and moving downward In step (d), the projecting portion is sheared by the projecting shearing blade, step (b) to step (d) are repeated a plurality of times (e), and in the final step, the punch is formed on the die hole. More blade Ku engaged to cut separation of the workpiece by the preformed shear blade (f) step, is characterized in that it comprises the steps of.

  According to the present invention, when performing a punching process on a plate-like workpiece by cooperation of a punch die and a die die, the tip side of the part that has been half-punched from the workpiece can be cut and separated from the workpiece, The scrap can be sheared short, and in the final process, it can be processed without leaving a half-punched part.

It is explanatory drawing which shows the structure of a punch metal mold | die. It is explanatory drawing which shows the structure of a die metal mold | die. It is operation | movement explanatory drawing of the follow-up process by cooperation with a punch metal mold | die and a die metal mold | die. It is explanatory drawing of the fine plastic deformation generation position which arises at the time of a punching process. It is explanatory drawing of the structure and effect | action of the conventional punch and die | dye.

  Referring to FIG. 1, a punch mold 1 according to an embodiment of the present invention includes a punch body (punch body) 3 having a circular cross-sectional shape. The punch body 3 is fitted in a cylindrical punch guide in an upper die mounted on an upper die holder (for example, an upper turret) in a punch press such as a turret punch press so as to be movable up and down. In addition, since the structure of the upper mold is a well-known structure, in order to facilitate understanding, description of the overall structure of the upper mold will be omitted, and only the main structure will be described. .

  A punch blade portion 5 having a rectangular cross-sectional shape and long in the radial direction of the punch body 3 is provided at the lower central portion of the punch body 3 so as to protrude downward. A protruding shearing blade 9 and a pre-formed shearing blade 11 that project downward are provided at the front end (lower end) of the punch blade 5 by providing a step 7 in the vertical direction substantially at the center. Are provided.

  The lower surface 9F of the protruding shearing blade 9 is slightly inclined so that the stepped portion 7 side is lowered, and the angle of the corner portion 9C where the stepped portion 7 and the lower surface 9F intersect is an acute angle of 90 ° or less. It is formed. And the level | step-difference part 7 is formed in the substantially circular arc-shaped curved surface, as shown to FIG. 1 (B). The angle of the corner portion 9C may be 90 °. The pre-formed shear blade 11 is provided with an isosceles triangular shaped shear blade 13 protruding downward at a position away from the stepped portion 7. The apex 13T at the lowermost end of the forming shear blade 13 is positioned higher than the lower surface 9F of the protruding shear blade 9, and the apex angle of the apex 13T is an obtuse angle.

  As shown in FIG. 2, the die die 15 for performing the punching process of the workpiece W in cooperation with the punch die 1 includes a disk-shaped die body 17. On the upper surface of the die body 17, A rectangular die hole 19 corresponding to the cross-sectional shape of the punch blade portion 5 is provided.

  In the configuration as described above, after the plate-like workpiece W is placed and positioned on the die body 17, the punch body 3 is lowered and the protruding shearing blade 9 is inserted into the die hole 19 of the die body 17 to be engaged. As shown in FIG. 3A, the scrap S is sheared and separated from the workpiece W. Then, when the lowering of the punch body 3 is stopped at a position where the apex 13T of the forming shear blade 13 substantially coincides with the lower surface of the workpiece W (that is, the punch blade portion 5 is shallowly engaged with the die hole 19), the forming shear is performed. A triangular projecting molded portion 21 projecting downward by the blade 13 is formed.

  In the protruding molded portion 21, the inclined surface portions 21S on both sides of the top portion 21T corresponding to the apex 13T of the molded shear blade 13 are half-cut portions and are not cut and separated from the workpiece W. It is connected with W. And the said protrusion shaping | molding part 21 exists in the state which produced work hardening by receiving a shaping | molding process.

  By the way, as described above, when the scrap S is punched by the protruding shearing blade 9, the periphery of the portion that becomes the scrap S is integral with the workpiece W.

  And since three directions other than the part corresponding to the level | step-difference part 7 of the protrusion shearing blade 9 in the punch blade part 5 are in the state supported by the peripheral part of the die hole 19 in the die main body 17, since rigidity is large, it mentioned above. Even if there is no configuration corresponding to the conventional cutting edge 109A, the portion of the scrap S can be cut and separated.

  By the way, as described above, when the scrap S is punched for the first time, the workpiece W is punched by the corner 9E (see FIG. 4) of the protruding shearing blade 9. A fine plastic deformation portion 23 (see FIG. 4) is generated on the surface of the workpiece close to the portion punched by the corner portion 9E. However, since the stepped portion 7 in the protruding shearing blade 9 is formed in a substantially arcuate curved surface and does not have a corner portion, the portion deformed by the stepped portion 7 includes the plastic deformation portion described above. 23 is not produced.

  As described above, after the first scrap S is punched, positioning is performed so that the top portion 21 </ b> T in the protruding molding portion 21 corresponds to the stepped portion 7 in the punch blade portion 5. Thereafter, when the punch body 3 is lowered, as shown in FIG. 3B, the portion corresponding to the protruding shearing blade 9 is cut and separated as the next scrap S1, and the portion corresponding to the forming shearing blade 13 is separated. As the next projecting molding portion 21, it is projecting downward.

  As described above, when the portion that becomes the scrap S1 is cut and separated from the workpiece W, the projection-molded portion 21 that has been molded in advance is a portion that has been half-cut from the workpiece W, and the top portion of the projection-molded portion 21 Since both sides of 21T are formed in advance on the inclined surface 21S, they can be cut and separated without producing the plastically deformed portion 23E. At this time, since the protruding molding portion 21 is connected to the workpiece W and is in a work-hardened state, the rigidity of the portion corresponding to the stepped portion 7 of the punch blade portion 5 is maintained, and the initial scrap Like S, scrap S1 can be cut and separated.

  As described above, the next scrap S1 is cut and separated, and the protrusion forming portion 21 is formed a plurality of times, so that the workpiece W is subjected to the punching process without causing the plastic deformation portion 23. Then, in the final step, as shown in FIG. 3C, the forming shear blade 13 in the punch blade portion 5 is engaged so as to deeply enter the die hole 19 of the die body 17, thereby simultaneously with the scrap S1. The separate scrap S2 is cut and separated from the workpiece W. At this time, a minute plastic deformation portion 23 is generated in a portion corresponding to the corner portion of the forming shear blade 13 in the pre-formed shear blade 11 as shown in FIG.

  As understood from the above description, when the overtaking process is performed on the workpiece W, the generated scraps S, S1, and S2 can be shortened. Further, when the workpiece W is punched, the minute plastic deformation portion 23 is in the initial punching process and the final punching processing of the workpiece W, and the plastic deformation portion 23 is formed during the additional punching process. It does not occur and the appearance can be improved.

  Further, the die die 15 only needs to have a die hole 19 corresponding to the cross-sectional shape of the punch blade portion 5 in the punch die 1, and the configuration of the die die 15 can be simplified. Is.

1 Punch mold 3 Punch body (Punch body)
DESCRIPTION OF SYMBOLS 5 Punch blade part 7 Step part 9 Protruding shear blade 11 Pre-formation shear blade 13 Molding shear blade 15 Die die 17 Die body 19 Die hole 21 Protrusion molding part

Claims (3)

  A punching die including a punch die and a die die, the punch die including a punch blade portion having a rectangular cross-sectional shape projecting downward at a lower portion of the punch body, and the die The mold has a rectangular die hole corresponding to the cross-sectional shape of the punch blade portion, and a protruding shear blade and a pre-formed shear blade are provided by providing a step portion in the vertical direction at the tip portion of the punch blade portion. And a preforming shearing blade that protrudes downwardly to form a separating position to be sheared and separated by the projecting shearing blade.   2. The die for follow-up processing according to claim 1, wherein the forming shear blade is formed in a triangular shape projecting downward, and the apex angle of the triangular portion is an obtuse angle, from the lower surface of the projecting shear blade. Is a die for over-cutting processing, which is also located at a high position. A method of overtaking using the die for overtaking according to claim 1 or 2,
(A) a step of positioning a portion to be cut and separated from the plate-like workpiece at a position corresponding to the protruding shear blade;
(B) a step of shallowly engaging a punch blade portion in the punch die with a die hole in the die die to cut and separate the portion to be cut and separated;
(C) at the time of the step (b), a step of half-cutting the work part corresponding to the pre-formed shear blade in the punch mold and forming into a shape protruding downward;
(D) positioning the half-punched part at a position corresponding to the protruding shearing blade, and shearing the downwardly projected part by the protruding shearing blade;
(E) a step of repeating the steps (b) to (d) a plurality of times,
(F) In the final step, the step of deeply engaging the punch blade portion with the die hole and cutting and separating the workpiece by the preformed shear blade;
An over-cutting method comprising the steps of:

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