JP2017047447A - Surface repair method of press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface repair method of a press die not generating a recess on an interface between the die and a repair member or on its peripheral repair surface, on the repair surface of the die.SOLUTION: A surface repair method of a press die comprises the first step for forming a processing hole P by opening a hole on a region including a damaged portion F formed on the surface of the press die Di, and the second step for implanting an implantation member A into the processing hole P, and performing surface finishing of the surface of the implantation member A and its peripheral press die Di.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a surface repair method for a press die.

  A conventional repair method when the surface of the press die is damaged will be described with reference to FIG.

  In the conventional repair method, as shown in FIG. 3A, the damaged portion F formed on the surface of the press die Di is damaged with a grinder (not shown) as shown in FIG. 3B. The rough cutting part G is formed by rough cutting.

  Next, as shown in FIG. 3 (c), build-up welding W is performed on the formed roughened portion G, and finally, as shown in FIG. 3 (d), the surface is finished with a grinder (not shown). .

  In the conventional repair method shown in FIG. 3, as shown in FIG. 4 in which the IV part of FIG. 3 (d) is enlarged, due to the difference in hardness between both the press die Di and the overlay welding W, the repair of both interfaces is performed. It has been specified by the present inventors that the concave portion C tends to be formed on the surface.

  Here, in Patent Literature 1, a repair filling member made of a heat treatment type aluminum alloy softened by solution treatment or overaging is inserted and pressed into a repair hole of an aluminum mold, and then the hole is filled. Alternatively, a repair method for an aluminum mold is disclosed, in which an age hardening treatment after solution treatment is performed to cure the repair filling member.

  On the other hand, Patent Document 2 discloses a method for repairing a casting defect part in which a solid-state metal is polymerized on the casting defect part, both are crimped, and the crimping part is heated to an appropriate temperature for diffusion bonding. Yes.

  Furthermore, in Patent Document 3, a material made of a zinc base alloy containing 10 to 50% by weight of aluminum is solution-treated at a temperature of 275 ° C. or higher, and a water-quenched repair material is 200 to 270 ° C. A mold repair method is disclosed in which a mold is processed to a desired shape after being heated to a temperature and crimped to a repair site of the mold.

JP 7-237225 A JP 52-139627 A JP-A-4-88156

  According to the repair method disclosed in Patent Document 1, even if there is a die machining error or a design change, it can be easily dealt with and the repair portion is not transferred to the molded product. Moreover, according to the repair method of the casting defect part disclosed by patent document 2, it is supposed that a weld crack and the coarsening of a crystal grain can be prevented, and the mechanical property fall of a repair part and its peripheral part can be prevented. Furthermore, according to the mold repair method disclosed in Patent Document 3, it is possible to easily repair a mold free from welding defects and pinholes.

  However, even with these repair methods, it is difficult to eliminate the above-described problems, that is, the occurrence of recesses in the repair surface of the press mold and the repair surface in the vicinity of the interface between the press mold and the filling member.

  The present invention has been made in view of the above-described problems, and provides a surface repair method for a press die that does not cause a recess in the repair surface of the die and the repair surface in the vicinity of the interface between the die and the repair member. The purpose is to do.

  In order to achieve the above object, a method for repairing a surface of a press die according to the present invention includes a first step in which a hole is formed in a region including a damaged portion formed on a surface of the press die to form a processed hole, This is a second step in which a driving member is driven into the processing hole, and the surface of the driving member and the surrounding press die is finished.

  The method of repairing the surface of a press die according to the present invention is characterized in that after making a hole in a region including a damaged portion formed on the surface of the press die, a repair is performed by driving a driving member into the processed hole. It is.

  After the driving member is driven into the processing hole, the surface of the driving member and the surrounding press die is finished, so that a recess is hardly formed on the repair surface at the interface between the press die and the driving member.

  Here, the “region including the damaged portion” means the damaged portion and the surrounding region, and the damaged portion is completely included in the processed hole by forming the processed hole with a drill or the like.

  The driving member to be driven into the processing hole is preferably made of the same material as the press mold. Since there is no difference in hardness between the processing site (the site where the driving member is driven) and its surroundings, it becomes more difficult to form recesses at both interfaces after surface finishing, resulting in a strength distribution on the surface of the press die. It becomes difficult.

  Here, when a processing hole formed by a drill or the like is viewed in a longitudinal section, the processing hole has a corner portion whose angle changes in the middle of the processing hole, and the same as the tip in the driving direction with respect to the processing hole. It is preferable to drive a driving member having a corner portion.

  The corner of the tip is locked to the corner of the machining hole according to the driving of the driving member, and the corner of the driving hole is plastically deformed by further driving of the driving member. It will be embedded inside the department.

  In this way, an anchor effect can be expected by embedding a part of the driving member inside the corner portion of the processing hole, and the high embedding strength (connection strength) of the driving member with respect to the processing hole formed in the press die is high. Played.

  By driving the driving member into the processing hole, the rear end of the driving member is slightly protruded from the surface of the press die. Therefore, the surface of the driving member and the surrounding press die surface are flattened, for example, by cutting the protruding portion of the driving member with a grinder or the like, thereby repairing the interface between the driving member and the surrounding press die. Surface repair can be performed without any recesses.

  As can be understood from the above description, according to the surface repair method of the press die of the present invention, after punching a region including a damaged portion formed on the surface of the press die, the member is driven into the processing hole. Can be repaired in a state where there is no recess on the repair surface of the interface between the driving member and the surrounding press die.

It is the flowchart explaining the surface repair method of the press die of this invention in order of (a)-(d). (A) is an enlarged view of IIa part of Drawing 1 (d), and (b) is an enlarged view of IIb part of Drawing 1 (d). It is the flowchart explaining the surface repair method of the conventional press metal mold | die in order of (a)-(d). FIG. 4 is an enlarged view of a portion IV in FIG.

  Hereinafter, embodiments of a surface repair method for a press die according to the present invention will be described with reference to the drawings. Note that the illustrated press die is an enlarged view of a part of various types of press dies.

(Embodiment of surface repair method of press mold)
It is the flowchart explaining the surface repair method of the press metal mold | die of this invention in order of Fig.1 (a)-(d).

  As shown in FIG. 1A, a damaged portion F is generated on a part of the surface of the press die Di, and the surface including the damaged portion F and its surrounding area is repaired.

  First, as shown in FIG. 1B, a processing hole P is formed from the surface of the press die Di to a predetermined depth with a drill Do in a region including the damaged portion F (first step).

  Here, the drill Do is reduced in diameter from the middle toward the tip, and has a sharp shape at the tip, and when viewed in the illustrated longitudinal section, the tip of the drill Do has a triangular shape.

  By using such a drill Do, the tip of the processed hole P to be formed also has a shape complementary to the tip shape of the drill Do, and when the processed hole P is viewed in a vertical cross section, in the middle thereof The corner P1 where the angle changes is provided.

  When the processing hole P is formed in the region including the damaged portion F, as shown in FIG. 1C, a driving member A having the same diameter as the processing hole P is driven into the processing hole P (X direction).

  Here, the driving member A is a metal member made of the same material as the press die Di. Since the driving member A and the press die Di are formed of the same material as described above, both hardnesses are the same.

  By driving the driving member A into the processing hole P, it is difficult for the concave portions to be formed at both interfaces after the surface finishing. However, since the driving member A and the press die Di are made of the same material, the concave portions at the both interfaces are further reduced. It becomes difficult to occur. Furthermore, it is difficult to generate an intensity distribution on the surface of the press die Di.

  As shown in FIG. 1C, in the state where the driving member A is driven into the processing hole P, the rear end of the driving member A is in a state of slightly protruding from the surface of the press die Di.

  Next, as shown in FIG. 1D, the surface of the driving member A and the surface of the press die Di around the surface of the driving member A are flattened, for example, while the protruding portion of the driving member A is shaved with a grinder or the like (not shown). (The above is the second step).

  In the surface repair method shown in the figure, by applying the method of driving the driving member A into the processing hole P, a concave portion is hardly formed on the repair surface at the interface between the portion where the driving member A is driven and the press die Di in the vicinity thereof. Become. Furthermore, as described above, since the driving member A is a metal member made of the same material as that of the press die Di, the recesses on the interface after the surface finishing and on the periphery thereof are further less likely to occur.

  Accordingly, as shown in FIG. 2 (a) in which the portion IIa in FIG. 1 (d) is enlarged by the surface repair method shown in the drawing, the repair surface S of the driving member A and the repair surface S of the press die Di in the vicinity thereof are shown. A repair surface without a recess is formed at the interface.

  Further, the driving member A to be used has a three-dimensional shape with a sharp outer periphery in the shape of its tip and recessed in a mortar shape toward the center, and is shown in FIGS. 1 (c) and 1 (d). In the plan view, it has an inverted triangular shape in the driving direction, and has corners A1 on the left and right.

  By applying the driving member A having such a shape, the corner portion A1 at the tip thereof is locked to the corner portion P1 of the processing hole P in accordance with the driving of the driving member A, and the driving member A is further driven. As a result, the corner portion A1 of the driving member A is embedded in the corner portion P1 of the processing hole P while being plastically deformed.

  That is, as shown in FIG. 2B, which is an enlarged view of the portion IIb of FIG. 1D, the corner portion A1 of the driving member A is plastically deformed to form a plastically deformed portion A1 ′, and this plastically deformed portion A1. 'Is embedded in the corner P1 of the processing hole P.

  Since the plastic deformation portion A1 ′ is embedded in the corner portion P1 of the processing hole P, an anchor effect can be expected, and high embedding strength of the driving member A with respect to the processing hole P formed in the press die Di is exhibited. .

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  Di: Press die, F: Damaged part, P: Drilled hole, P1: Corner part, Do ... Drill, A ... Driving member, A1 ... Corner part, A1 '... Plastic deformation part, S ... Repair surface

Claims (1)

A first step in which a hole is formed in a region including a damaged portion formed on a surface of a press mold to form a processed hole;
A press die surface repair method comprising a second step of driving a driving member into the processed hole and finishing the surface of the driving member and the surrounding press die.

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