KR20210074032A - manufacturing method of press mold - Google Patents

Abstract

The press mold manufacturing method of the present invention is for manufacturing a press mold in which a plurality of unit press molds are coupled to a press mold die, and the press mold die and the unit press mold are each produced in a manufacturing step and a step of assembling them together.
The manufacturing method of the press mold can not only simplify the manufacturing process, reduce processing precision, and shorten the manufacturing time, but also improve productivity.

Description

Manufacturing method of press mold

The present invention relates to a method for manufacturing a press mold, and more particularly, to a method for manufacturing a press mold capable of improving productivity by reducing the number of working hours according to the processing of the mold.

In general, the press mold forms various panel products by performing complex processes such as forming, drawing, bending, cutting, and punching of an iron plate, which is a material, using a press machine and a mold. will do That is, various panel products can be molded and manufactured by applying strong press pressure to the material by placing an iron plate as a material between the molds using two or more paired molds and moving the mold up and down.

However, the press mold faces difficult formability problems depending on the characteristics of the material of the material to be formed. In order to solve these problems, the hot stamping method (heating the material to 600℃ and then molding the material and cooling the material) Various molding methods are being introduced, such as the hot stamp method, which increases the tensile strength by 150 kg.

Korean Patent Registration No. 10-1403668 discloses a method of manufacturing a press mold for mass production of hot stamping cooling trim. The published hot stamping cold trim press mold for mass production includes the steps of: grinding the bottom surface and one edge surface of the mold material with a processing allowance of a certain thickness in consideration of the amount of deformation during heat treatment; processing the remaining edge surfaces except for the edge surface among the edge surfaces of the four sides where the junction part of the mold material is located; processing a reference hole for a guide pin and a reference surface thereof; forming a plurality of bolt holes penetrating the base surface and the bottom surface of the mold material; The three-dimensional shape processing of the surface of the steel body made of ultra-hard material centering on both reference holes, forming into a predetermined shape, and heat-treating, and applying the correction value based on the numerical table of the measured values according to the processing conditions to the bottom surface with machining allowance and polishing one side of the edge surface with still water, and wire processing the edge surface to form the front end of the still water.

In addition, Korean Patent Laid-Open No. 2011-0073998 discloses a method for manufacturing a mold for hot pressing, and Korean Patent Registration No. 10-1902739 discloses a method for manufacturing a press mold for producing a body panel of an automobile.

On the other hand, in order to manufacture a conventional press mold, roughing and finishing processing are completed in a state in which a mold material is assembled to a die, and a worker flame heat treatment is performed in a state in which the finished mold is assembled. Then, the amount of deformation that has been heat treated is removed by finishing.

Since this method removes the amount of deformation through a finishing operation after heat treatment is performed, it requires a relatively large amount of work, and there is a limit in improving the processing precision.

0001) Korea Patent Registration No. 10-1403668 0002) Republic of Korea Patent Publication No. 2011-0073998 Korean Patent Registration No. 10-1902739

The present invention is to solve the problems as described above, it is possible to improve the processing precision of the press mold, and to reduce the work man-hours according to the production of the mold, a method of manufacturing a press mold that can improve productivity It has a purpose to provide.

It is an object of the present invention to provide a method for manufacturing a press mold that can reduce processing restrictions according to the shape of the body and unit press because the body part and the unit press mold of the mold can be separately manufactured, and the process can be simplified.

The manufacturing method of the press mold of the present invention for solving the above technical problem is

A first reference surface processing step of roughing a workpiece for manufacturing a unit pre-mold and grinding a reference surface as a reference, and a fixing support hole for fixing to the workpiece on which the first reference surface manufacturing step is made, and for setting a position A hole processing step of marking the fixed pinhole forming part and machining a fixed support hole and a fixed pinhole, a contour processing step of machining the contour with a machining allowance so as to have a substantial shape of the unit press mold, and a contoured work in the contour processing step A heat treatment step of heat-treating the piece using a flame, a first reference surface abrasive machining step of finishing the reference surface of the heat-treated workpiece, and a back-up surface, a joint surface and an outer edge of the workpiece on which the reference surface is machined A unit press mold manufacturing step of manufacturing a unit press mold, including a finishing processing step of finishing processing; A step of preparing a die work piece, a die setting reference surface processing step of machining a setting reference surface after checking the casting deformation amount of the die work piece, and a fixed surface and a backup surface to which the reference surface on which the unit press mold of the die workpiece is mounted are in close contact A processing step of processing a unit mold mounting portion having a press mold, including a coupling hole forming step of forming a tab and a pin coupling hole corresponding to the fixing pin hole in a portion corresponding to the fixing support hole in the mold mounting of the die workpiece A press mold die manufacturing step of manufacturing a die;

Inserting a coupling pin into the fixing pin hole and the pin coupling hole of the unit mold mounting part of the press die, inserting a fixing bolt into the fixing support hole, and screwing the tap hole to combine the unit press die and the press die. characterized by including.

In the present invention, in the assembling step, setting the position of the unit press mold between the backup surface and the rear surface of the unit press mold, and further comprising a backup key insertion step for support.

In the finishing processing step of the unit press mold, the bonding surface is preferably made by wire electric discharge processing.

The manufacturing method of the press mold of the present invention is easy to standardize and shorten the schedule because the press mold die and the unit press molds are manufactured by performing separate processing and manufacturing processes, and the mold is completed by combining them.

In particular, it is easy to set and process the workpiece in the process of machining the press die and the unit press die, and the quality can be improved by further increasing the precision according to the machining.

1 is a cross-sectional view of a press mold for manufacturing by the manufacturing method of the present invention;
Figure 2 is a perspective view showing an extract of the unit press mold.
3 is a block diagram showing a method of manufacturing a press mold according to the present invention.

To a method for manufacturing a press mold according to the present invention, a cross-sectional view of the press mold for manufacturing is shown in FIG. 1 .

The method of manufacturing a press mold according to the present invention is for manufacturing a press mold 10 in which a plurality of unit press molds 40 are coupled to a press mold die 20 .

The manufacturing method of such a press mold consists of each manufacturing step of the press die 20 and the unit press die 40 and a step of assembling them with each other. Such a method of manufacturing a press mold can not only simplify the manufacturing process, reduce processing precision, and shorten the manufacturing time, but also improve productivity.

In the press mold manufacturing step of the press mold manufacturing method of the present invention, a die workpiece preparation step 110 of preparing a die workpiece manufactured using casting is performed. The die workpiece is a cast steel, and the material is made of HK600. When the die work piece is prepared, after checking the appearance and material of the die work piece and the amount of deformation of the cast steel, it is mounted on an NC machine tool, and the die setting reference surface processing step 120 of processing the setting reference surface is performed. In performing the die-setting reference surface processing step 120, a primary surface machining step of machining a setting surface, a keyway, a U-home, etc. is performed. In this first face cutting step, it is preferable to set the machining tolerance of the casting strain to 8.0/2,000 and the machining tolerance of the machining reference plane to 0.08/2,000.

As described above, the unit mold mounting additional processing step 130 is performed on the die work piece on which the primary face-cutting is performed. The unit mold mounting additional processing step 130 may be made of secondary chamfering, wherein the secondary chamfering processes the block bearing surface constituting the unit mold mounting portion 21 on the basis of the processing setting reference surface, and the skill bearing surface, the cam Machining the seat lights. In addition, the unit mold mounting part 21 performs a pin coupling hole for mounting the unit mold and a coupling hole forming step 140 for forming a tab. The unit mold mounting additional processing step 130 and the coupling hole forming step 140 as described above are processed to complete the tertiary face machining, that is, the unit mold mounting additional processing step 130 and the coupling hole forming step 140 to be described later. It is desirable to face machining with a margin of +0.5mm.

As described above, when the secondary face machining is performed, the steel bearing surface, the block bearing surface, the cam bearing surface, the reference hole processing, and the heel guide bearing surface are finished. At this time, it is preferable to maintain the tolerance of the steel backing surface from 0 to +0.02.

As described above, the unit press mold 40 is manufactured at the same time as the injection mold die is manufactured. The unit press mold 40 has a configuration in which a processing surface 41 is formed on the front side, a backup surface 42 on the rear side, and a reference surface 43 on the lower surface as shown in FIGS. 1 and 2 .

In order to manufacture the unit press mold, a workpiece preparation step of preparing a workpiece for manufacturing the unit press mold is provided. It is preferable to use HK600 (KS standard) as the material of the workpiece for manufacturing the unit press mold.

When the workpiece of the unit press mold 40 is prepared, a first reference surface processing step 210 of machining a reference surface serving as a processing reference of the unit press mold is performed. The machining of the reference surface of the workpiece is processed while checking the allowance of the machining pattern using a milling machine.

When the machining of the reference surface 41 on the workpiece for manufacturing the unit press mold is completed as described above, the position of the fixing pin hole 42 for setting the position based on this, and fixing for fixing the unit press mold 40 The position of the support hole 43 is marked, and the hole processing step 220 of processing the fixed support hole 43 and the fixed pin hole 42 using a drilling machine according to the marking position is performed. In the hole processing step 220, the processing of the hole is processed paying attention to the hole pulling phenomenon in which the hole is drawn to one side. When the fixing of the fixing support hole 43 and the fixing pin hole 42 is completed with the above, the unit press mold 40 based on the reference surface 42 for processing and the fixing support hole 43 and the fixing pin hole 42 as a reference. ) and a contour processing step 230 of processing the contour is performed. In the contour processing step 230 of the workpiece of the unit press mold, roughing is performed with a machining tolerance of +0.3 mm. And it is preferable to process with a machining tolerance of +0.5 mm of the surface corresponding to the backup surface of the press die 20 and the bonding surface.

When the contour processing step 230 of the workpiece of the unit press mold 40 is completed as described above, a heat treatment step 240 of heat-treating the workpiece for the unit press mold is performed. The heat treatment step 240 is preferably performed to HRC56 or higher by heat treatment using a flame. The heat treatment step 240 is not limited by the above-described embodiment. Various heat treatment methods capable of maintaining strength can be used.

And a first reference surface polishing step 250 of finishing the first reference surface of the workpiece of the unit press mold 40 on which the heat treatment is completed is performed. The first reference surface polishing step is preferably performed using a plane polishing machine.

The first reference surface polishing step 250 is completed, and the finishing processing step 26 is performed using the first reference surface. The finishing processing step 26 is. The workpiece of the unit press mold is mounted using the first reference surface polished by the table of the NC machine, and the contour, the joint surface, the corresponding surface of the backup surface, and the fixing pin hole are finished. It is preferable that the corresponding surface of the bonding surface and the backup surface be wire-discharged.

In parallel with this, it is installed between the rear surface of the unit press mold 40 and the backup surface 22, and a backup key processing step of processing and preparing a backup key (key, 50) for increasing the bearing capacity is performed.

As described above, when the machining of the press die 20 and the unit press die 40 is completed, an inspection step of inspecting their machining state is performed. And the assembly step 170 of mounting the unit press mold 40 to the unit mold mounting part 21 of the press mold die 20 is performed.

In the assembling step 170, after setting the position of the unit press mold 40 on the unit mold mounting part 21 of the press mold die 20, using the fixing bolt 25 and the coupling pin 24 Fix it. In this process, a backup key insertion step of mounting the backup key between the backup surface of the press die 20 and the unit mold mounting unit 21 is performed.

According to the method of manufacturing a press mold according to the present invention configured as described above, since the press mold die 20 and the unit press mold 40 are respectively processed and assembled, workability can be improved. In particular, since the heat treatment of the unit press mold is performed by the flame, workability according to the heat treatment can be improved.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is only exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Claims (3)

A first reference surface processing step of roughing a workpiece for manufacturing a unit pre-mold and grinding a reference surface as a reference;
A hole processing step of marking a fixing support hole for fixing and a fixing pinhole forming part for position setting on the workpiece on which the first reference plane manufacturing step is made, and processing the fixing support hole and the fixing pinhole;
A contour processing step of machining the contour with a machining allowance to have the actual shape of the unit press mold;
A heat treatment step of heat-treating the contoured workpiece using a flame in the contour processing step;
A first reference surface polishing processing step of finishing the reference surface of the heat-treated workpiece;
A unit press mold manufacturing step of manufacturing a unit press mold, including a finishing processing step of finishing the back-up surface, the joint surface and the outer surface of the workpiece on which the reference surface is machined; A step of preparing a die work piece, a die setting reference surface processing step of machining a setting reference surface after checking the casting deformation amount of the die work piece, and a fixed surface and a backup surface to which the reference surface on which the unit press mold of the die workpiece is mounted are in close contact A processing step of processing a unit mold mounting portion having a press die, and a hole forming step of forming a tab and a pin coupling hole corresponding to the fixing pin hole in a portion corresponding to the fixing support hole in the mold mounting of the die workpiece. A press mold die manufacturing step of manufacturing a;
An assembly step of inserting a coupling pin into the fixing pin hole and the pin coupling hole of the unit mold mounting portion of the press die, inserting a fixing bolt into the fixing support hole, and screwing the tap hole to combine the unit press die and the press die; to
A method of manufacturing a press mold, characterized in that it includes. The method of claim 1,
In the unit press mold coupling step, the method of manufacturing a press mold, characterized in that setting the position of the unit press mold between the backup surface and the rear surface of the unit press mold, and further comprising a backup key insertion step for support . The method of claim 1,
In the finishing processing step of the unit press mold, the bonding surface is a method of manufacturing a press mold, characterized in that made by wire electric discharge processing.

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