JP2006346732A - Forming die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forming die, with which forming of a projected part or a recessed part, such as burring, is performed on a part of a workpiece, and whose constitution is simplified. <P>SOLUTION: The forming die comprises: a die body 43 supporting a workpiece presser 47, which presses a workpiece W, movably in the direction along which the workpiece presser 47 enters and departs the die body 43; a cylinder body 51, integrally provided in the die body 43; a punch holder 53, supported by the cylinder body 51 movably in the direction opposite to the moving direction of the workpiece presser 47; a punch 55, which is provided on the punch holder 53 and whose front end part 55E is projected from a through hole 49H formed in the workpiece presser 47; and a fluid pressure mechanism, which transmits the movement of the workpiece presser 47 to/from the die body 43 to the punch holder 53 as a movement in the direction opposite to the moving direction of the workpiece presser 47. The workpiece presser 47 is formed in a cylindrical shape. One end side of the punch holder 53 is movably fitted into the workpiece presser 47. An end plate 49, which is provided with the through hole 49 in the workpiece presser 47, is attachably, detachably, and changeably provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a molding die for forming a convex portion or a concave portion on a part of a workpiece, for example, burring processing, and more specifically, movement of a work presser provided to be movable to the molding die, The present invention relates to a molding die configured to transmit to a punch holder via a fluid pressure mechanism and move the punch holder in a direction opposite to a moving direction of the work presser.

  When forming a plate-like workpiece such as burring, for example, after punching a small-diameter hole in the workpiece, the portion of the small-diameter hole is pressed with a punch so that it protrudes in a cylindrical shape from the workpiece surface. The convex part is molded. In this case, when performing burring (molding) so as to protrude from the ram (striker) side provided to the press machine so as to freely reciprocate, to the opposite side (for example, the lower surface) of the workpiece, What is necessary is just to descend | fall a punch and can carry out comparatively easily.

  However, when performing burring so as to protrude to the ram side surface (for example, the upper surface) of the workpiece, it is necessary to greatly lower the workpiece from the workpiece pass line with respect to the punch fixed to the lower mold. is there. Therefore, depending on the part where the work is molded, there is a case where the work is lowered more than necessary to cause an adverse effect.

  Therefore, in order to solve the problems as described above, there has been proposed a molding die that employs a configuration in which the movement of the work presser that holds the work is transmitted to the punch holder equipped with the punch via the fluid pressure mechanism (for example, a patent). Reference 1).

  The configuration of the mold described in Patent Document 1 is the configuration shown in FIG. That is, the molding die includes a cylindrical die block 3 that is detachably attached to a die holder 1 in a punch press (not shown), and a small diameter is provided at a plurality of locations on the same circle of the die block 3. The piston 5 is fitted so as to be movable up and down. A piston pressing plate 7 for preventing the piston 5 from coming off is fixed to the upper surface of the mold block 3 with a bolt or the like. A plate presser plate 11 having a through hole 11H in the center is integrally attached to the piston rod 9 that protrudes upward through the piston presser plate 7 by bolts 13.

  A punch holder 15 is fitted in the central portion of the mold block 3 so as to be movable up and down, and a punch that can protrude upward from the through-hole 11H of the plate pressing plate 11 is formed on the punch holder 15. 17 is attached so that attachment or detachment is possible. A stripper spring 23 is mounted between the end plate 19 attached to the lower end surface of the mold block 3 and the nut 21 attached to the lower end portion of the punch holder 15.

  In order to transmit the operation of the piston 5 to the punch holder 15, a piston 15P is formed at a substantially central portion in the longitudinal direction of the punch holder 15, and the fluid pressure chamber 25A in which the piston 15P is fitted and each of the above-described pistons 15P. The fluid pressure chambers 25 </ b> B into which the pistons 5 are inserted communicate with each other via fluid passages 27. Therefore, when the piston 5 is lowered, the punch holder 15 is relatively raised through the fluid in the fluid pressure chambers 25A and 25B.

In the above-mentioned configuration, in a state where the work W in which the small hole WH is formed is placed and positioned on the plate holding plate 11, the upper die 29 having the forming hole 29H on the lower surface is brought into contact with the upper surface of the work W, and thereafter When the upper die 29 is forcibly lowered by a ram or the like, the workpiece W, the plate pressing plate 11 and the piston 5 are integrally lowered, so that the punch holder 15 is relatively moved via the working fluid in the fluid pressure chambers 25A and 25B. Will be raised. The punch 17 provided on the upper part of the punch holder 15 projects the small hole WH of the workpiece W into the molding hole 29H of the upper die 29, and the workpiece W is subjected to upward burring. is there.
Japanese Patent No. 2934188

  As understood from the above description, in the above configuration, the fluid pressure chambers 25 </ b> B are perforated in a plurality of locations of the mold block 3, and the plurality of pistons 5, the piston pressing plate 7, and the plate pressing plate 11 are formed in the piston 5. A plurality of bolts 13 to be fixed are required, and there are problems that the number of processing steps is large, the number of component parts is large, the configuration is complicated, and the assembling work is troublesome.

  The present invention has been made in view of the above-described problems, and is a molding die for molding a plate-shaped workpiece, and is supported so as to be movable in a direction in which a workpiece presser for pressing the workpiece is moved in and out. A die main body, a cylinder main body provided integrally with the die main body, a punch holder supported by the cylinder main body so as to be movable in a direction opposite to the moving direction of the work presser, and the punch holder The punch that can protrude from the through-hole formed in the work holder and the movement of the work holder with respect to the mold body are transmitted to the punch holder as movement in the direction opposite to the movement direction of the work holder. The work presser is configured in a cylindrical shape, and one end side of the punch holder is movably fitted in the work presser. It is.

  In the molding die, an end plate provided with the through hole is provided in the work holder so as to be attachable and detachable.

  Further, the molding die is provided with a locking portion that can be locked to a locking step portion formed in the mold main body on a peripheral surface of the work presser.

  According to the present invention having the above-described configuration, the number of component parts of the molding die can be reduced, the configuration can be simplified, and the assembly work can be facilitated.

  Hereinafter, the configuration of the molding die according to the embodiment of the present invention will be described in detail with reference to the drawings. Components having the same effects as those of the conventional components described above are denoted by the same reference numerals, and redundant descriptions are provided. Omitted.

  Referring to FIG. 1, a molding die 41 according to the present embodiment includes a cylindrical mold body 43 that is detachably supported by the mold holder 1, and a fitting hole of the mold body 43. In 45, a cylindrical work presser 47 that also serves as a piston is fitted in such a manner that it can reciprocate in the direction in which it moves in and out (vertical direction in FIG. 1). The outer periphery of the work retainer 47 is freely engageable with an engaging step 45A formed on the inner peripheral surface of the fitting hole 45 in the mold body 43 in order to prevent the work retainer 47 from coming off. A locking portion 47A is formed.

  Further, an end plate 49 having a through hole 49H in the center is provided at the end of the work retainer 47 so as to be attachable / detachable via a locking tool 52 such as an O-ring. The work holder 47 and the end plate 49 can be provided integrally. However, in order to provide a configuration including a through hole 49 </ b> H having a diameter corresponding to the diameter of the punch, which will be described later, it is desirable that the end plate 49 be detachably attached to the work retainer 47.

  The end surface (upper surface in FIG. 1) of the end plate 49 is always in a state of protruding from the end surface (upper surface) of the mold body 43.

  A cylindrical cylinder body 51 is screwed to the other end surface side of the mold body 43, that is, the lower side. An inner diameter of the cylinder body 51 is formed larger than the outer shape of the work retainer 47, and a part of the lower part of the work retainer 47 is provided in the cylinder body 51 so as to be able to enter and exit. An upper end portion of a cylindrical punch holder 53 penetrating the bottom portion 51 </ b> B of the cylinder body 51 is slidably fitted into an inner hole of the work retainer 47, and is fitted to an upper end portion of the punch holder 53. The punch 55 is provided with a tip 55E that can protrude upward from the through hole 49H of the end plate 49 so as to be detachable and replaceable by a configuration similar to the conventional configuration.

  That is, the punch 55 and the rod 57 are sequentially inserted into the cylindrical punch holder 53 and then fixed by the set screw 59. A spring seat 63 is attached to the lower end of the punch holder 53 with a bolt 61, and a stripper spring 65 is mounted between the spring seat 63 and the cylinder body 51. Therefore, the punch holder 53 is always urged downward by the stripper spring 65.

  In the above configuration, the space (fluid pressure chamber) 67 defined by the inner peripheral surface of the cylinder body 51, the lower surface of the work holder 47, and the outer peripheral surface of the punch holder 53 constitutes a fluid pressure mechanism. The fluid pressure chamber 67 is filled with a working fluid such as hydraulic oil. In FIG. 1, reference numeral 69 denotes a seal member.

  In the configuration as described above, when the workpiece W is pressed and lowered by the upper die 29 after the workpiece W is placed on the upper surface of the end plate 49, the workpiece presser 47 is lowered, so that the working fluid in the fluid pressure chamber 67 is retained. Pressurized. Therefore, the fluid pressure in the fluid pressure chamber 67 acts on the large pressure receiving surface 53F formed on the outer peripheral surface of the punch holder 53, and the punch holder 53 is raised against the urging force of the stripper spring 65. The Therefore, as in the prior art, upward burring (molding) can be performed on the workpiece W.

  As already understood from the above description, the mold body 43, the work holder 47, the end plate 49, the cylinder body 51, the punch holder 53, the punch 55, and the like can be machined by turning. The processing is easy. Then, in the state where the punch holder 53 previously combined with the punch 55 and the like is combined with the cylinder body 51 and the upper portion of the punch holder 53 is fitted into the work holder 47, the cylinder body 51 is moved to the mold body. The molding die 41 can be assembled by being screwed to 43.

  That is, according to the above-described configuration, the number of component parts in the molding die 41 can be reduced, the configuration can be simplified, and the assembly work can be performed relatively easily. It can be solved.

  In the above-described configuration, the work presser 47 is cylindrical and also serves as a piston, and the entire lower end portion receives pressure evenly from the working fluid in the fluid pressure chamber 67. Therefore, when the work presser 47 moves up and down with respect to the mold body 43, it moves smoothly up and down without causing a galling phenomenon or the like.

  Further, since the upper end portion of the punch holder 53 is slidably fitted into the work retainer 47 and the punch 55 is provided at the upper end portion, the punch 55 is horizontally aligned with the punch 55 when the workpiece W is formed. When such a component force is applied, minute bending of the punch holder 53 and the like can be suppressed, and accurate molding can be performed.

It is a section explanatory view of a molding die concerning an embodiment of the present invention. It is sectional explanatory drawing of the conventional shaping die.

Explanation of symbols

41 Molding die 43 Mold body 47 Work clamp 49 End plate 49H Through hole 51 Cylinder body 53 Punch holder 55 Punch 55E Tip 63 Spring seat 65 Stripper spring 67 Fluid pressure chamber

Claims (3)

  A molding die for molding a plate-like workpiece, a die body that is supported so as to be movable in a direction in which the workpiece presser that presses the workpiece is moved in and out, and a cylinder that is integrally provided in the die body A main body, a punch holder supported by the cylinder main body so as to be movable in a direction opposite to the moving direction of the work presser, and a tip portion that can be protruded from a through-hole provided in the punch holder and formed in the work presser A punch and a fluid pressure mechanism that transmits the movement of the work press relative to the mold body to the punch holder as a movement in a direction opposite to the movement direction of the work press; and the work press is configured in a cylindrical shape A molding die, wherein one end side of the punch holder is movably fitted in the work presser.   2. The molding die according to claim 1, wherein an end plate provided with the through-hole is detachably / replaceably provided in the work holder. 3.   3. The molding die according to claim 1 or 2, wherein a locking portion that can be locked to a locking step portion formed on the mold body is provided on a peripheral surface of the work presser. Mold.

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