JP2005028374A - Method for forming projecting part on work and punch assembly for forming projecting part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a projecting part with which positioning in a plurality of directions is performed on the surface of a workpiece by press working without generating holes and recessed parts on the back surface of the workpiece. <P>SOLUTION: The workpiece W is received and supported with a die 8 having a flat workpiece supporting surface and the workpiece W is pressed down to the die 8 with a blank holder 5 given the force of a lifter spring 4. In this condition, a formed recessed part is produced on the surface of the workpiece by pressurizing the workpiece with a punch part 3a and, at this time, a part of the plastically deformed workpiece is protruded in a guide hole 6 in the top of the punch which is provided on the blank holder. By forming that protruding part inside the guide hole 6, the projecting part which is usable for positioning is produced on the surface of the workpiece. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
【Technical field】
The present invention relates to a method for forming a convex portion that can be used for positioning on the surface of a workpiece with a punch press, and a punch assembly for carrying out the method.
[0002]
[Background]
A processing method by so-called half punch or dowel forming, in which a part of a workpiece is extruded from the back surface to the front surface to form a positioning projection (projection protrusion or dowel) on the surface of the workpiece, is known in the past. Then, a hole and a recessed part arise in the back surface of a workpiece | work. If the holes and recesses are made, if the back side of the pressed product becomes the surface of the product, or if it is exposed on the surface of the product, it will be necessary to fill and polish the hole before the painting process to maintain a good appearance. The burden on the site increases.
[0003]
In addition, a dedicated positioning jig is used to eliminate the hole filling and polishing process before the painting process, and positioning of the workpiece is performed without providing a positioning projection on the workpiece. In the increasing production of small lots and made-to-order production for one article, production and management of frequent jigs are forced, which is not realistic.
[0004]
As a countermeasure against such a problem, it is desired to form a positioning convex portion without causing a hole or a concave portion on the back surface of the workpiece.
[0005]
As a technology that meets this requirement, for example, Patent Document 1 below discloses a protrusion-forming mold device that cuts a small protrusion on the upper surface of a workpiece.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-147136
[Problems to be solved by the invention]
If the mold apparatus of the said patent document 1 is used, it can cut and raise on the surface without producing a hole and a recessed part in the back surface of a workpiece | work, and can attach a protrusion.
[0008]
However, the mold apparatus of Patent Document 1 has a weak point that can form only one surface that can be used for positioning with respect to the cut and raised protrusion. FIG. 6A and FIG. 6B show cut-and-raised projections formed by the mold apparatus of Patent Document 1. FIG. In the figure, W is a workpiece, 20 is a cut-and-raised protrusion, and the cut-and-raised protrusion 20 has only one surface 21 that stands vertically. Accordingly, the cut-and-raised protrusion 20 can be used only for positioning in one direction.
[0009]
When the positioning direction is limited to one direction, each time the positioning direction is changed, the punch assembly is reset to a desired angle, or the punch assembly is mounted on an auto index station (station equipped with an automatic rotation mechanism). Here, it is necessary to use the method of rotating the punch assembly at a desired angle to cut again the protrusions that match the positioning direction, but the former method of resetting the punch assembly cannot improve productivity. .
[0010]
In addition, since the number of auto index stations in a turret punch press machine is limited, it is necessary to avoid forming positioning convexes with the auto index station as much as possible from the processing constraint surface. receive.
[0011]
Under such circumstances, the cut-and-raised projection formed by the mold apparatus of Patent Document 1 must be used only for applications in which the workpiece is positioned and processed only in one direction.
[0012]
An object of the present invention is to make it possible to form a convex portion capable of positioning in a plurality of directions on the surface of a workpiece by pressing without generating a hole or a concave portion on the back surface of the workpiece.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, the workpiece to be press-molded is supported and supported by a flat workpiece support surface, and the workpiece is pressed against the workpiece support surface with a plate press provided with a required pressing force. A part of the workpiece is pressure-deformed with a punch to form a molding recess on one surface of the workpiece, and a part of the composition-deformed workpiece is raised in a guide hole at the tip of the punch provided in the plate holder, and the raised portion is A method of forming a convex portion of a workpiece that forms a convex portion that can be used for positioning on one surface of the workpiece by forming the guide hole as a molding die, and
A punch assembly that forms a convex portion on one surface of a workpiece in cooperation with a die having a flat workpiece support surface, and a cylindrical punch guide having a plate presser at the tip, and is housed in the punch guide The punch has a punch that protrudes and retracts from a guide hole at the tip of the punch provided in the plate holder, and a pressing means that applies a required pressing force to the plate holder, and the guide hole at the tip of the punch provided in the plate holder has a molding die And a part of the workpiece is deformed under pressure at the tip of the punch to form a molding recess on one surface of the workpiece, and a part of the workpiece deformed at this time is raised in the guide hole, and the raised portion Is formed by the guide hole.
[0014]
The punch assembly can be provided with a stopper that limits the maximum protrusion amount of the punch tip from the plate presser.
[0015]
【The invention's effect】
In the method and punch assembly of the present invention, a work supported on a flat surface is pressed with a punch to form a molding recess in a part of the work, and at this time, a part of the work whose composition has been deformed is provided on the plate presser. The raised portion is raised in the guide hole at the tip of the punch, and the raised portion is formed by the guide hole at the tip of the punch of the plate holder to form a convex portion on one surface of the workpiece.
[0016]
According to this method, since the workpiece supported and supported by the flat support surface is pressed with a punch, no hole or recess is formed on the back surface of the workpiece.
[0017]
In addition, a gap corresponding to the thickness of the convex portion to be formed is provided between the inner surface of the guide hole at the tip of the punch provided on the plate press and the outer surface of the punch tip, and the thickness of the workpiece deformed by pressing with the punch is changed. A part of the guide hole rises into the gap (inside the guide hole) and is formed by the inner surface of the guide hole, forming a convex part that can be positioned in multiple directions with multiple planes or cylindrical surfaces with different directions. can do.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2 show an embodiment of a punch assembly.
[0019]
A punch assembly 1 shown in FIG. 1 includes a cylindrical punch guide 2, a punch 3, and a lifter spring 4. The punch 3 has a punch portion 3a for forming a concave portion, a punch body 3b, and a punch head 3c. The punch body 3b is fitted into the punch guide 2 so as to be vertically movable, and is provided at the lower portion of the punch body 3b. The punch portion 3 a is made to appear and disappear below the punch guide 2.
[0020]
The lower end wall of the punch guide 2 is configured as a plate presser 5, and the plate presser 5 is pressed against the workpiece W by applying a force of a lifter spring 4 interposed between the punch head 3 c and the punch guide 2. Like that. In the figure, 8 is a die 8 having a flat support surface, and this die 8 supports the back surface of the workpiece W. The workpiece W is sandwiched between the die 8 and the plate holder 5 to process the upper surface of the workpiece W. The lifter spring 4 that applies a required pressing force to the plate presser 5 may be replaced with another elastic body.
[0021]
The plate retainer 5 has a guide hole 6 at the tip of the punch portion 3a. In the present invention, a gap corresponding to the thickness of the recess 9 (see FIGS. 4 and 5) to be formed in the workpiece W is formed between the inner diameter surface of the guide hole 6 and the outer periphery of the tip of the punch portion 3a. The recess 9 is formed using the hole 6 as a forming die.
[0022]
The punch assembly 1 of FIG. 2 also has a lifter spring 4 provided inside the punch guide 2, and a punch portion 3a formed integrally with the punch body 3b in FIG. 1 is detachable from the punch body 3b. 1 differs from FIG. 1 in that the plate retainer 5 formed integrally with the punch guide 2 in FIG. 1 is attached to the punch guide 2 with bolts, but the configuration of the part characterizing the present invention is not different from that in FIG.
[0023]
Reference numeral 7 in FIGS. 1 and 2 is a stopper that limits the maximum protrusion amount s (see FIG. 3) of the punch 3 from the plate presser 5. In particular, when the workpiece W is thin, it is necessary to reduce the variation in the overall length of the punch 3 (the length from the tip of the punch portion 3a to the punch head 3c) and to make the amount of biting of the punch into the workpiece W constant. . If the stopper 7 is provided, the position where the punch body 3b hits the stopper 7 and the movement is restricted becomes the bottom dead center of the punch. Therefore, even if the length of the punch 3 is set to be rough, strict stroke management can be performed. A convex portion having a stable shape and size can be formed.
[0024]
When the punch assembly 1 configured as described above is mounted on a punch press and the punch head 3c is struck with a striker capable of moving up and down, the punch assembly 1 is first pushed down at the beginning of the squeeze. Then, the plate retainer 5 below the punch guide 2 comes into contact with the upper surface of the workpiece W supported by the die 8, and then the lifter spring 4 is compressed and sandwiched between the die 8 and the plate retainer 5. The required clamping pressure works. Thereafter, the punch 3 struck by the striker further compresses the lifter spring 4 and descends, and the tip of the punch 3 is pushed downward from the plate retainer 5 to pressurize the workpiece W. By the pressurization, a concave portion 9 (see FIGS. 4 and 5) is formed on the upper surface of the workpiece W by a punch.
[0025]
At this time, since the gap formed between the outer periphery of the punch portion 3a and the inner surface of the guide hole 6 is the only escape place, the workpiece flesh located in the concave portion 9 rises and enters the gap. The raised portion is formed on the inner surface of the guide hole 6 to form a convex portion 10 as shown in FIGS.
[0026]
As for the convex part 10, the outer peripheral surface used for positioning needs to stand substantially perpendicularly from the upper surface of the workpiece | work W, However, The upper surface of a convex part does not need to be the surface where the shape was prepared.
[0027]
FIG. 4 shows that a thin steel plate having a thickness t = 0.6 to 2.0 mm is used as a work W, and the punch assembly of the present invention is used on the upper surface of the steel plate. The example which formed the cylindrical convex part 10 of (phi) 3.0mm, cylinder thickness 0.5mm, and cylinder height A = 0.3-0.5mm is shown. This cylindrical convex portion 10 can be used for positioning in all directions of 360 °.
[0028]
In addition, the convex part 10 formed in the surface of a workpiece | work by the method of this invention may be a square cylinder shape as shown in FIG. As for the cross-sectional shape of the square tube, a quadrangle is excellent in workability and the like, but is not limited to a quadrangle.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing an example of a punch assembly according to the present invention. FIG. 2 is a cross-sectional view showing another example of the punch assembly according to the present invention. [FIG. 4] (a) A plan view showing an example of a convex portion formed by the method of the present invention. (B) A cross-sectional view of the convex portion of the same. [FIG. 5] (a) Formed by the method of the present invention. FIG. 6B is a cross-sectional view of the convex portion of the same as above. FIG. 6A is a plan view showing the raised protrusion formed in the conventional direction. FIG. Sectional view of [Figure]
DESCRIPTION OF SYMBOLS 1 Punch assembly 2 Punch guide 3 Punch 3a Punch part 3b Punch body 3c Punch head 4 Lifter spring 5 Plate holder 6 Punch tip guide hole 7 Stopper 8 Die 9 Recess 10 Protrusion W Workpiece

Claims (3)

The workpiece to be press-formed is supported and supported by a flat workpiece support surface, and the workpiece is pressed against the workpiece support surface with a plate presser with the required pressing force. In this state, a part of the workpiece is pressed and deformed with a punch. A concave portion is formed on the surface of the workpiece, and a part of the composition-deformed workpiece is raised in a guide hole at the tip of the punch provided in the plate holder, and the raised portion is molded using the guide hole as a molding die. A method for forming a convex portion of a workpiece, wherein a convex portion that can be used for positioning is generated on a surface. A punch assembly that forms a convex portion on the surface of a work in cooperation with a die having a flat work support surface, a cylindrical punch guide having a plate presser at the tip, and is housed in this punch guide The punch has a punch that protrudes and retracts from a guide hole at the tip of the punch provided in the plate holder, and a pressing means that applies a required pressing force to the plate holder, and the guide hole at the tip of the punch provided in the plate holder has a molding die And a part of the workpiece is deformed under pressure at the tip of the punch to form a molding recess on the surface of the workpiece, and a part of the workpiece deformed at this time is raised in the guide hole, and the raised portion Is formed by the guide hole. The punch forming punch assembly according to claim 2, further comprising a stopper for limiting a maximum protrusion amount of the punch tip from the plate presser.

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