KR20170010251A - Hot press forming manufacturing method and mold therefor - Google Patents

Abstract

A hot press forming forming method, and a mold. The hot press forming forming method of the present invention comprises: a material placing step of placing a high temperature material on a seating portion of a lower mold; A primary molding step in which a press disposed on an upper portion of the lower mold is downwardly moved toward the lower mold to press the material to primarily mold the material; Wherein the flange forming cam unit provided in the lower mold during the primary molding step is pressed toward the material in a direction perpendicular to the pressing direction of the press to bend the end of the material to form a flange, Molding step; A press returning step in which the press is returned to an original position while being raised to an upper portion of the lower mold; And a step of taking out the molded finished product which has been molded on the lower mold.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hot press forming forming method,

The present invention relates to a hot press forming forming method and a mold, and more particularly, to a hot press forming forming method and a hot press forming method capable of securing moldability for a product having a difficult flange process, Forming method and a mold thereof.

In order to cope with the fuel efficiency and environmental safety regulations, which are being strengthened all over the world, researches on high strength and light weight of automobile parts are being conducted.

Hot Press Forming (HPF) is a typical high strength and light weighting process, which is a process of producing Ultra High Strength Steel (UHSS) products by rapidly cooling and molding high temperature materials.

Such a hot press forming technique can improve the spring back phenomenon of existing ultra high strength steel products because the material is molded and cooled at a high temperature condition which is excellent in moldability and the product is completed.

The hot press forming technique is currently the most powerful and lighter weight technique, and it is known that the hot press forming technique is rapidly spreading due to the strengthened regulations.

However, unlike the high-temperature material with good formability, the products made by the hot press forming technique become martensite, which is a high-strength structure after the completion of the molding process. Accordingly, the flanging process performed in the conventional stamping process, There is a disadvantage that a restriking process is impossible.

For this reason, the products made by the hot press forming technique have to be completed in a single process, so they are applied only to center pillar and windshield parts which are relatively simple in shape.

On the other hand, according to the strengthened regulations, it is required for hot press forming of various parts from a car maker. However, since such a product has a complex shape rather than a simple shape, hot press forming is difficult.

Korea Patent Office Application No. 10-1996-0028496 Korea Patent Office Application No. 10-1997-0047419 Korea Patent Office Application No. 10-2008-0091692 Korea Patent Office Application No. 10-2013-0128487

It is an object of the present invention to provide a hot press forming forming method and a mold capable of securing the moldability of a product which is difficult to be flanged by a conventional technique and improving the quality of the product.

The above object is achieved by a method of manufacturing a metal mold, comprising: a material placing step of placing a high temperature material on a seating portion of a lower mold; A primary molding step in which a press disposed on an upper portion of the lower mold is downwardly moved toward the lower mold to press the material to primarily mold the material; Wherein the flange forming cam unit provided in the lower mold during the primary molding step is pressed toward the material in a direction perpendicular to the pressing direction of the press to bend the end of the material to form a flange, Molding step; A press returning step in which the press is returned to an original position while being raised to an upper portion of the lower mold; And a step of taking out the molded article after the molding is completed on the lower mold.

The flange forming process by the flange forming cam unit during quenching may be performed while the primary forming step and the cooling step during the secondary flange forming step are performed together.

The above object is also achieved by a lower mold having a seating portion on which a high temperature material is seated; A press which is arranged to be movable up / down from an upper part of the lower mold and presses down the material toward the lower mold to mold the material; And a pressing member which is movably disposed on one side of the lower mold and is pressed in a direction perpendicular to a pressing direction of the press when the press is operated downward to be pressed toward the work so as to bend the end of the work, And a flange forming cam unit for forming the flange forming cam unit.

At least one of the lower mold, the press, and the flange molding cam unit may be provided with a cooling channel for cooling when the material is molded.

The flange forming cam unit includes: a unit block; A material pressing block for forming the flange on the material while being substantially pressed against the material; And a return spring provided between the unit block and the workpiece pressing block and returning the workpiece pressing block to the original position, wherein the unit block and the press are provided with the unit block so that the unit block can be interlocked And inclined surfaces that are arranged to be inclined relative to each other can be formed.

According to the present invention, it is possible to apply a flange process to a hot-press forming product, thereby molding a product that is difficult to be molded into an existing process.

Further, according to the present invention, since a product is produced by a single process, the process cost is reduced due to the reduction in process water.

Particularly, in the case of the present invention, since the moldability of the hot press forming process is improved, hot press forming can be applied to various parts, thereby improving the weight and safety of the automotive parts.

1 is a perspective view of a high temperature material.
FIGS. 2 to 6 are views showing steps of molding the material of FIG. 1 into the hot press forming forming die according to the first embodiment of the present invention.
7 is a flowchart of the hot press forming forming method.
8 is a structural view of a hot press forming forming die according to a second embodiment of the present invention.
9 is a structural view of a hot press forming forming die according to a third embodiment of the present invention.
10 is a structural view of a hot press forming forming die according to a fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

However, the description of the present invention is merely an example for structural or functional explanation, and thus the scope of the present invention should not be construed as being limited by the embodiments described in the text.

For example, since the embodiments are susceptible to various modifications and various forms, the scope of the present invention should be construed as including equivalents capable of realizing technical ideas.

It is to be understood that the scope of the present invention should not be construed as being limited thereto since the object or effect of the present invention is not limited to the specific embodiment.

In the present specification, the present embodiment is provided to complete the disclosure of the present invention and to fully disclose the scope of the invention to a person having ordinary skill in the art to which the present invention belongs. And the present invention is only defined by the scope of the claims.

Thus, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.

It is to be understood that the meaning of the terms used in the present invention is not limited to a dictionary meaning, but should be understood as follows.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined.

Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of the embodiments, the same components are denoted by the same reference numerals, and explanations of the same reference numerals will be omitted in some cases.

FIG. 1 is a perspective view of a hot material, FIGS. 2 to 6 are views showing steps of molding the material of FIG. 1 into a hot press forming mold according to a first embodiment of the present invention, 7 is a flowchart of a hot press forming forming method.

Referring to these figures, the hot press forming mold according to the present embodiment is capable of securing the moldability of a product which is difficult to process the flange 21 by a conventional technique, thereby improving the quality of the product, A lower mold 110, a press 120, and a cam unit 130 for flange forming.

First, the lower mold 110 is a mold which is fixed in position, unlike the press 120, and supports the flange forming cam unit 130.

The lower mold 110 is provided with a seating part 111 on which the high-temperature material 10 is seated. The upper end of the seat part 111 is flat and has a large surface, so that the hot material 10 can be seated well.

The periphery of the seating part 111 forms a lower surface than the seating part 111, and the flange forming cam unit 130 can be coupled thereto. The flange forming cam unit 130 can reciprocate at a certain position at the corresponding position.

Next, the press 120 is a mold which is arranged to be movable up / down from the upper part of the lower mold 110, unlike the lower mold 110 fixed.

The press 120 is pressed downward toward the lower mold 110 to form the material 10. In this case,

The press 120 is formed downward on the lower mold 110 so that the forming part 121 is formed on the bottom surface of the press 120 so that the material 10 can be formed. The forming part 121 is pressed on the seating part 111 of the lower mold 110 by the thickness of the material 10 so that the material 10 of the flat plate material can be firstly formed in a U- do.

Finally, the flange forming cam unit 130 is a device that is movably arranged on one side of the lower mold 110, and the flat material 10 of the plate material is pressed by the press 120 into a first- The flange 21 is bent at both ends of the primary molded portion in the shape of the letter " C " as shown in FIG.

In other words, the flange forming cam unit 130 is pressed in the direction perpendicular to the pressing direction of the press 120 when the press 120 is operated downward, and is pressed toward the workpiece 10, So as to form the flange 21.

As described above, the hot press forming forming process has been applied only to a center pillar and a wind shield which are relatively simple in shape. However, in the present embodiment, the flange forming cam unit 130 The flange 21 can be molded into the molded article 20 as it is applied. Therefore, it is possible to form a more complicated product by a single operation unlike the prior art, thereby eliminating the occurrence of a process-related loss.

Actually, in the past, a post-process had to be performed once again in order to form the flange 21, but in this embodiment, since the finished molded product 20 having the flange 21 can be obtained by only one process, It is possible to improve the productivity by reducing the tact time.

This flange forming cam unit 130 includes a unit block 131 and a material pressing block 132 for forming a flange 21 on the material 10 while being pressed against the material 10 substantially, And a return spring 133 which is provided between the material pressing block 131 and the material pressing block 132 and returns the material pressing block 132 to the original position.

At this time, the unit block 131 and the press 120 are formed with inclined surfaces 131a and 120a which are inclined to each other so that the unit block 131 can be interlocked when the press 120 is operated. That is, when the press 120 is down, the press slope 120a of the press 120 is pressed against the unit block inclined surface 131a of the unit block 131 of the flange forming cam unit 130 The unit block 131 can be pressed toward the workpiece 10 and the return spring 133 is pressed by the pressing force to push the workpiece pressing block 132 to form the flange 21 in the workpiece 10. [ .

When the molding is completed and the press 120 returns to the upper position, the compressed return spring 133 is expanded, and the flange forming cam unit 130 can also be returned to the original position by this force.

On the other hand, in the case of this embodiment, the high-temperature material 10 can be formed into the molded end product 20 having the flange 21 as shown in Fig. 6 by the interaction of the press 120 and the flange molding cam unit 130 Therefore, the high-temperature material 10 should be cooled during the bending operation so that the bent portion can be maintained. To this end, a cooling channel (not shown) may be provided, which is sufficient if the cooling channel is provided in at least one of the lower mold 110, the press 120, and the flange forming cam unit 130.

Hereinafter, the hot press forming forming method according to the present embodiment will be described.

First, the hot material 10 is placed on the seating portion 111 of the lower mold 110 (S11).

Next, the press 120 disposed on the upper portion of the lower mold 110 is pressed down toward the lower mold 110 to press the workpiece 10 to form the workpiece 10 (S12).

During the primary molding step, the flange forming cam unit 130 provided in the lower mold 110 is pressed toward the workpiece 10 in a direction perpendicular to the pressing direction of the press 120, The end portion is bent to form the flange 21 (S13).

The cooling process in the course of the primary molding step S12 and the secondary flange molding step S13 may be performed in parallel. Particularly, in the case of this embodiment, the forming process of the flange 21 during quenching can proceed.

Next, the press 120 is lifted up to the upper portion of the lower mold 110 and returned to the home position (S14).

When the press 120 is returned to its original position, the molding finished product 20 is taken out from the lower mold 110 and the flange 21 is formed (S15).

According to the present embodiment having the structure and function as described above, it is possible to apply the process of the flange 21 of the hot press forming product, so that it is possible to form a product which is difficult to be molded in the conventional process.

Also, according to this embodiment, since the product is produced by a single process, the process cost is reduced due to the reduction of the process water.

Further, according to this embodiment, as the formability of the hot press forming process is improved, hot press forming can be applied to various parts, so that the weight and safety of the automotive parts can be improved.

8 is a structural view of a hot press forming forming die according to a second embodiment of the present invention.

Referring to this figure, the hot press forming forming die according to the present embodiment also includes a lower mold 210, a press 120, and a flange forming cam unit 130.

In this structure, the lower mold 210 is provided with a cooling channel 250. The cooling channel 250 can be either oil-cooled or water-cooled.

Particularly, the cooling channel 250 serves to quench the bending portion when the press 120 first bends the work 10. At this time, the flange forming process by the flange forming cam unit 130 can proceed have.

Even if the present embodiment is applied, it is possible to apply a flange process to a hot press forming product, which makes it possible to form a product which is difficult to be molded into a conventional process, and a process cost is reduced due to production of a single process.

9 is a structural view of a hot press forming forming die according to a third embodiment of the present invention.

Referring to this figure, the hot press forming forming die according to the present embodiment also includes a lower mold 310, a press 120, and a flange forming cam unit 130.

In this structure, the magnet 350 is provided on the seating part 111 of the lower mold 310. The magnet 350 magnetically attracts the center portion of the workpiece 10 to prevent the workpiece 10 from being displaced during molding or during seating.

Even if the present embodiment is applied, it is possible to apply a flange process to a hot press forming product, which makes it possible to form a product which is difficult to be molded into a conventional process, and a process cost is reduced due to production of a single process.

10 is a structural view of a hot press forming forming die according to a fourth embodiment of the present invention.

Referring to this figure, the hot press forming forming die according to the present embodiment also includes a lower mold 410, a press 120, and a flange forming cam unit 130.

In this structure, the lower mold 410 is provided with a depression 413, and the pusher 450 is provided in the depression 413.

The pusher 450 can be applied as a cylinder or the like and the pusher 450 pushes the end of the work 110 slightly upward when the press 120 is pressed and when the flange forming cam unit 130 is operated, It can serve to assist the flange 21 (see FIG. 6) to be well formed.

Even if the present embodiment is applied, it is possible to apply a flange process to a hot press forming product, which makes it possible to form a product which is difficult to be molded into a conventional process, and a process cost is reduced due to production of a single process.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It is therefore intended that such modifications or alterations be within the scope of the claims appended hereto.

10: Material 20: Finished product
21: flange 110: lower mold
111: seat part 120: press
120a: Press inclined surface 121: Molded part
130: flange forming cam unit 131: unit block
131a: Unit block inclined surface 132: Material pressing block
133: return spring

Claims (5)

Placing a material having a high temperature on a seating portion of a lower mold;
A primary molding step in which a press disposed on an upper portion of the lower mold is downwardly moved toward the lower mold to press the material to primarily mold the material;
Wherein the flange forming cam unit provided in the lower mold during the primary molding step is pressed toward the material in a direction perpendicular to the pressing direction of the press to bend the end of the material to form a flange, Molding step;
A press returning step in which the press is returned to an original position while being raised to an upper portion of the lower mold; And
And a step of taking out the molded end product which has been molded on the lower mold.
The method according to claim 1,
Wherein the flange forming process by the flange forming cam unit proceeds during quenching while the primary forming step and the cooling step during the secondary flange forming step are performed together.
A lower mold having a seating portion on which a high temperature material is seated;
A press which is arranged to be movable up / down from an upper part of the lower mold and presses down the material toward the lower mold to mold the material; And
When the press is down, is pressed in a direction perpendicular to the pressing direction of the press and is pressed toward the material to bend the end of the material to form a flange Wherein the flange-forming cam unit comprises a flange-forming cam unit.
The method of claim 3,
Wherein at least one of the lower mold, the press, and the flange molding cam unit is provided with a cooling channel for cooling when the material is molded.
The method of claim 3,
Wherein the flange forming cam unit comprises:
Unit block;
A material pressing block for forming the flange on the material while being substantially pressed against the material; And
And a return spring provided between the unit block and the workpiece pressing block and returning the workpiece pressing block to its original position,
Wherein the unit block and the press are formed with inclined surfaces which are inclined relative to each other so that the unit blocks interlock with each other when the press is operated.

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