JP2017140641A - Chamfering mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chamfering mold capable of suppressing generation of joints of a sagging trace caused by chamfering when chamfering is carried out along the cutting edge (ridge line) of a workpiece by a number of times.SOLUTION: This chamfering mold for carrying out chamfering along a ridge line part by a plurality of chamfering operations along the ridge line of the cutting surface of a plate-like workpiece is provided with: an upper mold 3; and a lower mold 5. One of the upper mold 3 and the lower mold 5 is provided with an extrusion member 19 that presses the ridge line part of the cutting surface of the workpiece. The extrusion member 19 is provided with a chamfering part 23 that executes chamfering by pressing the surface of a part of the ridge line part. The chamfering part 23 is provided with: a normal chamfering part 23A that executes chamfering of a normal shape in the ridge line part; and a softened chamfering part 23B that executes chamfering of a shape in which a surface pressing amount becomes gradually shallower.SELECTED DRAWING: Figure 4

Description

  The present invention provides a chamfering mold for chamfering a cutting edge (ridge line) of a cut surface when a long hole processing or cutting processing is performed on a plate-like workpiece by a plate material processing machine such as a punch press or a laser processing machine. About. More specifically, the present invention relates to a chamfering mold that can suppress the occurrence of a seam of “sagging traces” caused by chamfering when a chamfering operation is performed a plurality of times along the ridgeline of the workpiece.

  When a plate-shaped workpiece is cut or punched by a punch press or the like, dripping occurs on the upper surface of the cut surface of the workpiece and burrs are generated on the lower surface. When a plate-like workpiece is cut by laser machining, the upper and lower cutting edges (ridge lines) on the cut surface of the workpiece form a right-angled corner. Therefore, when a hand touches a plate-shaped workpiece cut by a plate material processing machine such as a punch press or a laser processing machine, the burr or sharp cutting edge may cause injury.

  Therefore, conventionally, deburring and chamfering are performed manually using, for example, a grinder or a file. Deburring is also performed using a deburring machine. Furthermore, chamfering is performed by pressurizing the cutting edge (ridge line) portion of the workpiece with upper and lower molds in a punch press (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 1-153814

  The configuration described in Patent Document 1 includes a lower mold 100 and an upper mold 101 as schematically shown in FIG. The upper surface of the lower mold 100 is flat. And the protrusion part 103 provided with the inclination part 103S is provided in the lower surface of the upper mold | type 101. FIG. In the above configuration, by pressing the cutting edge (ridge line) portion of the cutting surface WF of the plate-like workpiece W placed on the lower mold 100 by the inclined portion 103S of the protrusion 103 provided in the upper mold 101, Chamfering is performed.

  In the above configuration, when chamfering is performed on the ridge line portion by chamfering operations along the ridge line (cut edge) of the cut surface WF in the workpiece W, when the cross-sectional shape of the protrusion 103 is circular As shown in the plan view exaggeratingly in FIG. 2A, arc-shaped sagging marks (indentations) WM are continuously formed along the cut surface WF as a chamfered portion. When the cross-sectional shape of the protrusion 103 is rectangular, a rectangular indentation WM is continuously formed as a chamfered portion as shown in FIG. A triangular seam portion 105 is formed between the indentations WM. Therefore, there is a problem in improving the appearance of the chamfered portion.

  The present invention has been made in view of the above-described problems, and is a chamfering mold for performing chamfering processing on a ridge line portion by a plurality of chamfering operations along a ridge line of a cutting surface in a plate-shaped workpiece. An upper die and a lower die, and one of the upper die and the lower die is provided with a pressing member that presses a ridge line portion on a cut surface of a workpiece, and a part of the ridge line portion is pressed on the surface. The pressing member includes a chamfering portion that performs chamfering processing, and the chamfering portion includes a regular chamfering portion that performs chamfering processing in a regular shape on the ridge line portion, and a chamfering shape in which the chamfering amount gradually decreases. And a relaxed chamfering portion for performing the above.

  Further, in the chamfering mold, the chamfered portions are respectively provided at symmetrical positions in the pressing member.

  In the chamfering mold, the pressing member has a rectangular cross-sectional shape, and the chamfered portion is provided on the long side of the rectangular portion.

  In the chamfering mold, the pressing members are respectively provided in upper and lower molds, and the upper and lower pressing members are respectively provided with chamfered portions.

  Further, in the chamfering mold, the pressing member is configured to have a protruding portion, and the cross-sectional shape of the protruding portion is a cross-sectional shape that becomes wider as it is separated from the distal end side, and a cross section is formed at the base end portion of the protruding portion. An arc-shaped surface pressing portion is provided.

  According to the chamfering mold of the present invention, since the regular chamfering portion that performs chamfering of a regular shape and the relaxed chamfering portion that gradually decreases the surface pressing amount are provided, the above-described triangular seam portion is generated. Thus, the appearance of the chamfered portion can be improved.

It is explanatory drawing of the chamfering process by the conventional upper and lower metal mold | die. It is explanatory drawing of the problem in the conventional chamfering process. It is explanatory drawing which showed notionally and schematically the structure of the metal mold | die which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the structure of the chamfering chip which concerns on the 1st Embodiment of this invention. It is operation | movement explanatory drawing in the case of chamfering to the cutting edge which the long hole formed in the workpiece | work opposed. It is operation | movement explanatory drawing in the case of chamfering to the cutting edge which the long hole formed in the workpiece | work opposed. It is explanatory drawing which shows the structure of the chamfering chip which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which showed notionally and schematically the structure of the metal mold | die which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the cross-sectional shape of the protrusion part with which the chamfering chip | tip (pressing member) was equipped.

  Referring to FIG. 3, the chamfering mold 1 according to the present embodiment has a chamfering process on the ridge line portion by chamfering operations a plurality of times along the cutting edge (ridge line) of the cutting surface WF in the plate-like workpiece W. The upper die 3 and the lower die 5 are provided. The upper die 3 is provided to be movable up and down on an upper die holder 7U in a punch press (not shown). And the lower mold | type 5 provided facing the upper mold | type 3 up and down is equipped with the lower mold | type holder 7L in the punch press.

  The upper die 3 includes a cylindrical punch guide 9 supported by a lifter spring (not shown) so as to be movable up and down on the upper die holder 7U. A punch body 11 is fitted and inserted into the punch guide 9 so as to be movable up and down. A punch driver 13 provided integrally on the upper portion of the punch body 11 penetrates a retainer collar 15 provided on the upper portion of the punch guide 9 so as to be movable up and down. A stripper spring 18 is mounted between the punch head 17 screwed to the upper end portion of the punch driver 13 and the retainer collar 15. A chamfering tip 19, which can be protruded downward from a plate pressing portion 9 </ b> A provided at the lower end portion of the punch guide 9, is detachably attached to the lower end portion of the punch body 11 by a fixing tool (not shown) such as a set screw. It is. The upper surface of the lower mold 5 is formed in a plane.

  The chamfer tip 19 is configured as shown in FIGS. That is, the chamfered tip 19 includes an attachment surface 19F for attaching to the tip attachment surface 11F formed at the lower end portion of the punch body 11 as an upper surface. The mounting surface 19F is formed with a screw hole (not shown) for attaching the chamfered tip 19 to the punch body 11 by a fixing tool (not shown) such as a mounting screw.

  The chamfer tip 19 constitutes a pressing member that chamfers by chamfering a ridge line portion (cut edge portion) on the cut surface of the workpiece W. On the lower surface of the pressing member (the chamfered tip 19), a protruding portion 21 is formed long in the left-right direction (X-axis direction). Further, on both sides of the projecting portion 21 in the front-rear direction (Y-axis direction), a surface pressing portion 23 having an arcuate cross-sectional shape that performs surface pressing of the ridge line portion of the cutting surface WF in the workpiece W is formed.

  The chamfered portion 23 constitutes a chamfered portion that chamfers by chamfering a ridge line portion (cut edge) of the cut surface of the workpiece W. In the chamfered portion (surface pressing portion) 23, a regular chamfered portion 23A that performs a regular shape chamfering (for example, R chamfering, C chamfering) on the ridge line portion is formed long in the left-right direction. And the relaxation chamfering process part 23B is continuously provided in the one end side of this regular chamfering process part 23A.

  More specifically, as shown in FIG. 4 (B), the relaxed chamfered portion 23B is formed so that the amount of chamfering gradually decreases as the distance from the regular chamfered portion 23A increases in the X-axis direction. In other words, the relaxed chamfering portion 23B is curved or inclined so that the right end side of the relaxed chamfering portion 23B gradually increases as the distance from the regular chamfering portion 23A increases.

  The configuration of the chamfering tip (pressing member) 19 will be described in more detail. As shown in FIG. 9, the cross-sectional shape of the protruding portion 21 provided in the pressing member 19 is from the front end side (the lower end side in FIG. 9). The cross-sectional shape is provided with the inclined surfaces 21S on both sides in the Y direction so as to be separated, that is, wider toward the upper side than the tip side. And the said surface pressing part 23 whose cross-sectional shape is circular arc shape is formed in the base end part of this protrusion part 21. As shown in FIG. The surface pressing portion 23 is smoothly connected to the inclined surface 19 </ b> S in the Y direction formed on the pressing member 19 and the inclined surface 21 </ b> S of the protruding portion 21.

  In the configuration as described above, a workpiece W in which a long hole 25 (see FIG. 5) having a width substantially equal to the width dimension in the Y-axis direction of the protruding portion 21 provided in the chamfered tip 19 is processed in advance is shown in FIG. As shown in FIG. Then, the upper die 3 is lowered, and the workpiece W is pressed and fixed to the upper surface of the lower die 5 by the plate pressing portion 9 </ b> A in the upper die 3. Thereafter, the punch body 11 in the upper die 3 is lowered, and the cutting edge (ridge line) 25L on the cutting surface 25F facing the long hole 25 formed in the workpiece W is cut by the chamfering tip 19 provided at the lower end of the punch body 11. Perform chamfering.

  At this time, since the width dimension in the Y-axis direction of the long hole 25 and the width dimension in the Y-axis direction of the protruding portion 21 of the chamfered tip 19 are formed to be substantially equal, the cutting edge (ridge line) 25L is The chamfering process is performed by chamfering by the chamfered portions 23 formed on both sides of the protruding portion 21 in the Y-axis direction. As described above, when chamfering is performed by pressing the cutting edge 25L by the chamfering portion 23 of the chamfering tip 19, when the chamfering tip 19 is pressed down to the lowest position, the normal chamfering processing portion of the chamfering portion 23 is obtained. The shape of the regular chamfering portion 23A is transferred to the cutting edge 25L corresponding to 23A.

  Therefore, as shown in FIGS. 6A and 6B, a regular chamfered portion 25 </ b> A is formed at the cutting edge 25 </ b> L of the long hole 25 in the workpiece W. Then, the shape of the relaxed chamfered portion 23B is transferred to the portion of the cut edge 25L corresponding to the relaxed chamfered portion 23B in the chamfered portion 23. Since the relaxed chamfered portion 23B is formed so that the amount of chamfering gradually becomes shallower as it moves away from the regular chamfered portion 23A, the chamfered amount is moderate at the portion corresponding to the relaxed chamfered portion 23B. The chamfering process 25B of the shape is performed.

  6C, the chamfered portion 25B has a deep chamfering amount on the side of the regular chamfered portion 25A, and the chamfered amount on the end side 25C of the chamfered portion 25B is as follows. It becomes gradually shallower. Therefore, the amount of plastic deformation on the end side 25C of the chamfered portion 25B gradually decreases, and the work hardening is small. Therefore, when the next chamfering process is performed by the chamfering tip 19 continuously to the chamfering part 25A, the regular shape is obtained by performing the chamfering process by the regular chamfering part 23A, overlapping the chamfering part 25B. The chamfered portion 25A is continuously processed. Therefore, it is possible to perform chamfering without generating the above-described triangular seam portion 105. Therefore, it is possible to improve the appearance of the chamfered portion.

  Note that the final chamfering operation is performed after the chamfering tip 19 is turned by 180 ° relative to the workpiece W.

  As described above, when the chamfering process of the cut surface 25L in the long hole 25 is performed, the inclined surfaces 21S are formed on both sides of the protruding portion 21, so that the protruding portion 21 is smoothly engaged and disengaged with respect to the long hole 25. It can be done. Further, since the arc-shaped surface pressing portion 23 is smoothly connected to the inclined surface 19S, indentation can be prevented.

  By the way, in the chamfering process shown in FIG. 2B, when the chamfering process is performed so that a part of the indentation WM overlaps, the above-described triangular seam part 105 is not formed. However, when the indentation WM is formed, work hardening occurs at the end of the indentation WM due to plastic deformation. And the part of the edge part which this work hardening produced remains as a trace of the edge part of indentation WM. That is, when chamfering is performed, if a work-hardened portion resulting from plastic deformation occurs at the end of the indentation WM, the work-hardened portion remains as a chamfered trace.

  By the way, in the said chamfering chip | tip 19, the case where the surface pressing part 23 was formed in the both sides of the protrusion part 21, and the chamfering of the cutting edge 25L which the long hole 25 opposed was demonstrated simultaneously was demonstrated. However, the surface pressing portion 23 may be configured to be formed only on one side of the protruding portion 21.

  FIG. 7 shows a configuration of a chamfering tip 19A according to the second embodiment. In the chamfering chip 19A according to the second embodiment, the same components as those in the chamfering chip 19 according to the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted. To do.

  In the chamfering tip 19A according to the second embodiment, the chamfered chamfered portion 23B is provided on both ends of the regular chamfered portion 23A of the chamfered portion 23 formed on one side of the protruding portion 21. Therefore, when the chamfering operation along the cutting end surface is repeated a plurality of times when chamfering the cutting end surface in a plate-shaped workpiece, the directionality of the moving direction along the cutting end surface is not restricted. It is. That is, the chamfering process can be performed while moving in the right direction or the left direction along the cut end surface.

  In the above description, the case where the upper surface of the workpiece W is chamfered by the upper mold 3 has been described. However, by providing the lower mold 5A with the chamfering tip 19 and a vertically symmetrical chamfering tip 19L (see FIG. 8), it is possible to perform chamfering simultaneously on both the upper and lower surfaces of the workpiece W. Since the upper mold 3 shown in FIG. 8 has the same configuration as the upper mold 3 shown in FIG. 3, the same reference numerals are given to components having the same functions, and redundant description is omitted.

  The structure of the lower mold 5A shown in FIG. 8 will be described. The lower mold 5A includes a die base 27 supported by the lower mold holder 7L. At the center of the upper surface of the die base 27, a chip holder 29 having the chamfered chip 19L at its upper end is detachably provided. An ejector plate 31 surrounding the chamfered tip 19L is provided on the upper surface of the die base 27 so as to be movable up and down. The ejector plate 31 is always urged upward by a coil spring 33 that is elastically mounted between the ejector plate 31 and the die base 27. The upward movement is restricted by screwing a set screw 35 penetrating through the die base 27 up and down to the lower side of the ejector plate 31.

  With the above configuration, the long hole WH formed in the workpiece W is positioned between the upper and lower chamfering chips 19 and 19L in the upper and lower molds 3 and 5A. When the workpiece W is pressed by the plate pressing portion 9 </ b> A of the punch guide 9 in the upper die 3, the ejector plate 31 is lowered against the urging force of the coil spring 33. The workpiece W is also lowered simultaneously with the ejector plate 31, and the chamfering tip 19L enters the elongated hole WH of the workpiece W from the lower side to perform chamfering. When the ejector plate 31 comes into contact with the die base 27 and stops descending, the punch body 11 in the upper mold 3 is lowered against the urging force of the stripper spring 18. Therefore, the chamfering tip 19 in the upper mold 3 enters the long hole WH of the workpiece W from the upper side and performs chamfering. Therefore, the upper and lower cutting edges of the long hole WH in the workpiece W are simultaneously chamfered.

  The chamfering tip 19L in the lower mold 5A can be a chamfering tip that is symmetrical with the chamfering tip 19A.

  As understood from the above description, according to the chamfering mold according to the present embodiment, when a chamfering operation is performed a plurality of times along the longitudinal direction of the cutting edge (ridge line) on the cut surface of the workpiece, The chamfering process can be performed without generating a “mark” seam.

  In addition, according to the present embodiment, the pressing members 19 and 19A have a rectangular cross-sectional shape, and the chamfered portion 23 is the length of the rectangular portion as is apparent from FIGS. It is provided on the side. Therefore, when the cutting edge (ridge line) is long, the number of chamfering operations can be reduced.

DESCRIPTION OF SYMBOLS 1 Chamfering die 3 Upper die 5 Lower die 9 Punch guide 11 Punch body 19, 19A Chamfering tip (pressing member)
19L Chamfering chip 23 Chamfering portion 23A Regular chamfering portion 23B Relaxing chamfering portion 25 Long hole 25A Regular shape chamfering portion 25B Loose chamfering portion 25F Cut surface 25L Cutting edge (ridge line)

Claims (5)

  A chamfering mold for chamfering the ridgeline portion by chamfering operations along a ridgeline of a cut surface in a plate-shaped workpiece, and includes an upper mold and a lower mold, and the upper mold or One mold of the lower mold is provided with a pressing member that presses a ridge line portion on the cut surface of the workpiece, and a chamfering portion that performs chamfering by pressing a part of the ridge line portion is provided in the pressing member. The chamfering portion includes a regular chamfering portion that performs chamfering in a regular shape on the ridge line portion, and a relaxed chamfering portion that performs chamfering in a shape in which the surface pressing amount gradually decreases. Chamfering mold.   2. The chamfering mold according to claim 1, wherein the chamfered portion is provided at a symmetrical position in the pressing member.   3. The chamfering mold according to claim 1, wherein a cross-sectional shape of the pressing member is a rectangular shape, and the chamfered portion is provided on a long side of the rectangular portion. Chamfering mold.   4. The chamfering mold according to claim 1, 2, or 3, wherein the pressing members are respectively provided in upper and lower molds, and each of the upper and lower pressing members is provided with a chamfered portion. Chamfering mold. The chamfering mold according to any one of claims 1 to 4, wherein the pressing member includes a protrusion, and the cross-sectional shape of the protrusion is a cross-sectional shape that becomes wider as the distance from the tip end increases. A chamfering die comprising a protruding portion having a surface pressing portion having a circular arc cross section.

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