KR20160126186A - Mold and method for molding embossing of metal sheet - Google Patents

Abstract

The present invention relates to a mold to mold an embossing protrusion of a metal thin plate, and a method of forming an embossing protrusion with a protrusion height of a maximum ratio of a thickness of a metal thin plate using the same. According to the present invention, the present invention is able to precisely mold an embossing protrusion on a metal thin plate having a thickness in micrometers and mold a multi-staged embossing protrusion by sequentially pressing the embossing protrusion through a three-step mold, whereby enabling molding an embossing protrusion having an utmost protrusion height which is a height that is five times greater than a thickness of a metal thin plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming an embossing protrusion of a metal thin plate and a method of molding the embossing protrusion using a protrusion height of a maximum ratio of the thickness of the metal thin plate using the mold,

The present invention relates to a forming die capable of forming an embossing protrusion precisely on a thin metal plate, and a method of forming an embossing protrusion with a maximum protrusion height relative to the thickness of the thin metal plate in a molding critical point by using the forming die And a molding method.

Generally, when embossing is formed on a metal plate, it is possible to enhance the reflectance of light to improve the appearance of the surface and make the appearance of the surface more beautiful, even if friction or contact with other objects causes abrasion or scratching of the surface. Slip prevention, and acupressure role.

BACKGROUND ART [0002] Techniques for molding embossing in the past have mainly been applied to a synthetic resin, a fabric, and the like. As a technique for embossing a metal plate, there are disclosed in Patent Registration No. 10-0899853 and 10-2010-0091745 However, the disclosed technique is merely to pressurize the surface of the metal plate with the irregularities of the roller to make the surface bend like a wrinkle shape.

Meanwhile, the embossing protrusion can be formed by press working using a conventional drawing die. However, in the method of press working through a typical drawing die, it is difficult to precisely form the metal plate material when it is thinned. Especially, There is a limit in that the molded embossing projection can not exhibit its function because the height of the protrusion that can be molded is limited.

Registration No. 10-0899853: embossing molding method for steel sheet member of thin sheet Patent Document 10-2010-0091745: Apparatus for forming a wrinkled embossing on the surface of a thin metal plate

It is an object of the present invention to provide a metal foil embossing protrusion forming die capable of precisely forming a fine embossing protrusion on a thin metal plate.

Another object of the present invention is to provide a molding method capable of effectively molding the embossing protrusion so that the embossing protrusion has a maximum protrusion height in comparison with the thickness of the thin metal plate within a molding critical point.

In order to achieve the above object, according to the present invention,

A lower core coupled to an upper surface of the lower plate and having a die hole formed at an upper end thereof, a lower core having a lower metal plate on which a metal foil to be molded is seated and held, and a lower end supported by the lower plate, An upper core coupled to a lower surface of the upper plate and formed with a punch hole at a lower end thereof and relatively lifted and lowered relative to the lower core; A punch rod having a lower end inserted into the punch hole and provided inside the upper core and a lower end formed with a forming pin protruding from the lower end to press the thin metal plate into a forming groove to form an embossing protrusion; And a core guider for guiding straight up and down of the upper core to the lower core, The washing protrusions formed mold is disclosed.

Here, the die rod and the punch rod have stepped portions on the side of the tip so as to be engaged when the die hole and the punch hole are inserted, respectively, so that the rear ends thereof are protruded by a predetermined length from the lower end of the lower die core and the upper end of the upper die core, And a support pocket may be formed on the lower surface of the upper plate and the lower plate to support the rear end of each of the protruding die rod and the punch rod.

As a means for solving the problem of the present invention,

The forming pins of the primary mold, the secondary mold, and the tertiary die are arranged such that the diameter of each of the primary, secondary, and tertiary dies decreases from the primary die to the tertiary die. The diameter of the forming groove gradually decreases from the primary mold to the tertiary mold correspondingly to the forming pin, and the diameter of the forming groove gradually decreases from the primary mold to the tertiary mold, and the primary mold, the secondary mold, A method for molding an embossing projection with a protrusion height of a maximum ratio of the thickness of a metal thin plate which forms a multi-stage embossing projection to a metal thin plate by sequentially pressing a metal thin plate to be molded with a tertiary die.

Here, before the metal thin plate is pressed by the primary metal mold, a metal thin plate may be put into a vacuum heating furnace for vacuum heat treatment in order to improve the elongation of the metal thin plate to be molded.

According to the embossing protrusion forming die of the metal thin plate and the molding method using the same,

The embossing protrusion can be precisely formed on the thin metal plate having a thickness of micrometer (탆), the mold can be easily manufactured, and the die and the punch can be easily replaced, thereby improving the workability.

In addition, the embossing protrusions are sequentially pressed through the three-step mold to mold the embossing protrusions having a multi-stage shape, so that the protrusion height of the embossing protrusions can be maximized to about 5 times as much as the thickness of the metal sheet, .

It is to be noted that, in addition to the effect specifically described above, a specific effect that can be easily derived and expected from the characteristic configuration of the present invention can also be included in the effect of the present invention.

1 is an exploded perspective view illustrating a configuration of a molding die according to the present invention,
2 is a perspective view illustrating a configuration of a die rod and a punch rod according to the present invention,
3 is a cross-sectional view illustrating a structure of a lower plate, a lower die core, and a die rod,
4 is a cross-sectional view illustrating the configuration of the upper plate, the upper core, and the punch rod,
5 is a cross-sectional view illustrating the overall structure and operation of the molding die according to the present invention,
6 is a view illustrating the shape of the embossing protrusion formed by the molding method of the present invention,
7 is a photograph of the embossing protrusion finally formed by the molding method of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method of forming an embossing protrusion forming mold and a method of forming an embossing protrusion using the same according to the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention to those skilled in the art, It should be noted that the present invention can be reduced or exaggerated for the sake of simplicity.

Furthermore, when describing an embodiment, when a constituent element is described as being "formed", "coupled", or "installed" with respect to another constituent element, it may be directly formed, , It should be understood that there may be other components in between

In addition, when describing the embodiments, in the case where it is judged that technical characteristics of the present invention may be unnecessarily blurred as a matter known to those skilled in the art, such as known functions and configurations well known in the art, Description thereof will be omitted.

1 to 5 illustrate an embossing protrusion forming die according to the present invention. Referring to the drawings, an embossing protrusion forming die (hereinafter referred to as " forming die " A lower die 10, a lower die 20, a die rod 30, an upper plate 40, a top core 50, a punch rod 60, a core guider 70 ). ≪ / RTI >

The upper plate 40, the upper mold core 50 and the punch rod 60 constitute a stationary mold. The upper plate 40, the upper mold core 50, and the punch rod 60 constitute a stationary mold, Thereby forming a movable side mold which is lifted and lowered by pressing.

The lower plate 10 is positioned at the lowermost side and the lower core 20 is coupled to the upper surface of the lower plate 10 through bolts B .

1, a die hole 21 is formed at an upper end of the lower die core 20 so that the upper end of the die rod 30 can be inserted into the lower die core 20, A pair of engagement pieces 22 formed with bolt holes 23 for fastening the bolts B to the bolts B can be protruded.

Here, the die holes 21 may be formed of a plurality of at least one or more, depending on the number of the embossing projections to be formed. In FIG. 1, ten die holes 21 are illustrated as an example.

3 so that the die rod 30 to be described later can be installed inside the lower die core 20 while being inserted into the die hole 21 in the lower die core 20, The rod passage 24 can be formed so as to communicate stepwise with the die hole 21 by having a relatively large diameter.

However, in the case where there are a plurality of die holes 21, in order to reduce the machining cost for forming the rod passage 24, instead of forming the rod passage 24, the whole inside of the lower die core 20 communicating with the die hole 21 May be formed in a hollow shape.

A pair of holding protrusions 25 for holding the metal thin plate M through both ends of the deposited thin metal plate M are mounted on the lower die core 20, And may be formed to protrude upward on both sides of the die hole 21.

The die rod 30 functions as a molding die, and a molding groove 31 for molding an embossing protrusion is recessed at a predetermined depth at an upper end of the molding die 31. A rounded A curved surface portion 31a can be formed.

2, the upper end of the die rod 30 is inserted into the die hole 21 at the upper end of the lower die core 20, and the lower end of the die rod 30 is supported by the lower plate 10 So that it is installed inside the lower die core 20.

A step portion 32 is formed at the upper end of the die rod 30 so that the die rod 30 is inserted when the die rod 30 is inserted into the die hole 21, So that the upper portion with respect to the step portion 32 can have a diameter that can be inserted into the die hole 21 and the lower portion can be formed with a diameter that can be inserted into the rod passage 24. [

3 and 5, the lower end of the die rod 30 can be extended so as to protrude by a predetermined length from the lower die core 20 when the lower die core 20 is inserted into the lower die core 20, The supporting pockets 11 may be formed on the upper surface of the lower plate 10 so as to support the protruding portions of the protrusions 30.

When the lower end of the die rod 30 protrudes by a predetermined length from the lower die core 20, the die rod 30 can be easily removed from the lower die core 20, .

The die rods 30 may be installed in the lower die core 20 in a plurality of one or more corresponding to the number of die holes 21.

The top plate 40 is positioned at the uppermost position and the upper mold core 50 is coupled to the lower surface of the upper plate 40 through bolts B, So that it is symmetrical with the lower plate 10 and the lower die core 20 described above.

The upper core 50 may have the same shape as the lower core 20. A punch hole 51 may be formed at the lower end of the lower core so that the lower end of the punch rod 60 can be inserted, A pair of engaging pieces 52 formed with bolt holes 53 for fastening the bolts B to the upper plate 40 may be formed on both side surfaces.

Here, the punch hole 51 may be formed of a plurality of at least one or more than one die hole 21, depending on the number of the embossing projections to be formed.

A punch hole 60 is formed in the punch hole 51 as shown in FIG. 4 so that the punch rod 60 to be described later is inserted into the punch hole 51, The punch hole 51 and the punch hole 51 may be formed in the same manner as the lower core 20. In this case, It is of course possible to form the entire interior of the upper core 50 in a hollow form

A pair of projecting grooves 55 corresponding to the holding protrusions 25 are formed on both sides of the lower end of the upper mold core 50 so that the holding protrusions 25 of the lower mold core 20 can be inserted without interference .

The punch rod 60 functions as a forming punch corresponding to the die rod 30 and the forming pin 61 for pressing the metal thin plate M into the forming groove 31 to form the embossing protrusion is protruded .

 Here, a curved surface portion 51a rounded with a curvature of a certain radius may be formed at the lower end of the forming pin 61. [

2, the punch rod 60 may have a rod shape having the same length as the die rod 30, and the lower end portion of the punch hole 51 at the lower end of the upper core 50 And is installed in the upper core (50) by being supported by the upper plate (40) while being inserted.

Here, like the above-described die rod 30, when the punch hole 51 is inserted into the punch hole 51 through the rod passage 54, the mounting position of the punch rod 60 is set and the lower side is supported So that the lower portion of the punch rod 60 can be inserted into the punch hole 51 and the upper portion of the lower portion of the punch rod 60 Can be formed to have a diameter that can be inserted into the rod passage (24).

4 and 5, the punch rod 60 is inserted into the upper core 50 so as to be easily detached from the upper core 50 provided in the same manner as the die rod 30, The upper end of the upper plate 40 can be extended so as to protrude by a predetermined length from the upper core 50 when the upper plate 40 is installed. The support pockets 41 upwardly recessed to the same predetermined depth can be formed.

The punch rod 60 may be provided on the upper core 50 in correspondence with the number of the die rods 30 by a plurality of at least one or more.

Next, the core guider 70 is a constituent part for alignment between the stationary-side mold and the movable-side mold having the above-described structure, and performs a function of guiding the movable-side mold to be moved up and down straightly with respect to the stationary-side mold .

The core guider 70 may have a cylindrical shape and is installed to be extrapolated to the lower core 20 and the upper core 50.

A core passage 71 having a shape corresponding to the shape of the lower core 20 and the upper core 50 is formed so as to pass through the upper and lower portions of the core guider 70, Precise alignment between the stationary-side mold and the movable-side mold becomes possible by guiding the upper mold core (50) in a straight state while the lower mold core (20) and the upper mold core (50) are inserted.

5, in the state that the metal foil M to be molded is held on the upper portion of the lower core 20, the upper mold core 50 is pressurized by a pressing device such as a hydraulic press, The forming pin 61 of the punch rod 60 presses the thin metal plate M and presses the thin metal plate M into the molding groove 31 of the die rod 30. [ So as to form an embossing protrusion on the thin metal plate M. [

Hereinafter, a molding method for forming the embossing protrusion with the protrusion height of the maximum thickness ratio of the thin metal plate using the molding die having the above-described structure will be described.

First, in order to sequentially mold the metal foil M to be molded, three pairs of the above-configured molding dies are prepared as a primary die, a secondary die and a tertiary die.

At this time, the diameter of the forming pins 61 of each of the primary mold, the secondary mold, and the tertiary mold is gradually decreased from the primary mold to the tertiary mold, and the protrusion height is gradually increased.

In addition, the diameter of the forming groove 31 corresponding to the forming pin 61 is gradually decreased from the primary mold to the tertiary mold.

When the primary mold, the secondary mold, and the tertiary mold having different sizes of the forming pin 61 and the forming groove 31 are prepared, the metal foil M to be molded is heat-treated before the press molding process.

The heat treatment is carried out by heating the metal thin plate M by heating in a vacuum furnace. Through such heat treatment, the elongation of the thin metal plate M can be secured and the molding critical point can be improved.

Thereafter, the heat-treated thin metal plate M is put into a primary mold to perform primary molding for molding an embossing protrusion.

Then, the first metal foil (M) is put into a second metal die to form second metal foil (M), and then the second metal foil (M) is sequentially charged into a third metal die .

After the three-step molding process is progressed, the metal thin plate M is formed on the metal thin plate M in accordance with the gradual change in the diameter and the protruding height of the forming pin 61 and the forming groove 31 The embossing protrusion is formed into a multi-step shape as illustrated in FIG. 6, and can be formed at a protrusion height of the maximum ratio in comparison with the thickness of the thin metal plate M within a molding critical point.

<Examples>

As a specific example of the forming method according to the present invention, SUS304L having a thickness of 50 mu m was prepared as a thin metal plate specimen.

The SUS304L specimen was subjected to vacuum heat treatment in eight steps as follows.

400 ° C for 30 minutes, third - 800 ° C for 2 hours and 40 minutes, fourth - 800 ° C for 30 minutes, fifth - 900 ° C for 1 hour, 6 Tea - 30 minutes at 900 ° C, 7 hours - 3 hours and 10 minutes at 400 ° C, 8 minutes - 2 minutes at 20 ° C

The punching rod and the die rods of each die were set in the molds, and the sizes of the forming pins and the forming grooves of the die rods were set to Were formed differently as shown in Table 1 below.

Primary mold

Secondary mold
Third Mold
Forming pin
0.5 × H 0.2

0.25 x H 0.25
Φ0.18 × H 0.3
Molding groove
0.5 0.7 H 0.5

0.5 0.5 H 0.5
Φ0.3 × H 0.5

(Unit: mm)

Then, the heat-treated SUS304L specimen having a thickness of 50 탆 was sequentially press-molded through the prepared primary mold, secondary mold, and tertiary mold to form an embossing protrusion.

FIG. 7 shows photographs of the embossing protrusions formed on the SUS304L specimen through the three-step molding, and the results of measuring the protruding heights of the ten embossing protrusions are shown in Table 2 below.

Embossing
number 1

No.2
number 3
time
5 times
No. 6
No. 7
8 times
No. 9
10 times
Height

0.27
0.27
0.27
0.27
0.26
0.27
0.26
0.26
0.27
0.27

(Unit: mm)

The embossing protrusion having a protrusion height of 0.26 to 0.27 mm was formed on the metal thin plate specimen having a thickness of 50 탆 as described above. The embossing protrusion can be formed at a protrusion height of about 5 times as large as the thickness of the thin metal plate Respectively.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments or constructions. It will be understood that the present invention is not limited to the above-described embodiments.

The main parts of the accompanying drawings are as follows.
10: lower plate 11/41: support pocket
20: Lower die core 21: Die hole
30: die rod 31: molding groove
32/62: step 40: upper plate
50: upper mold core 51: punch hole
60: punch rod 61: forming pin
70: core guider 71: core passage

Claims (4)

A lower core coupled to an upper surface of the lower plate and having a die hole formed at an upper end thereof, and a thin metal plate to be molded is seated on the die hole;
A die rod having a lower end supported by the lower plate, an upper end inserted into the die hole and installed in the lower die core, and a molding groove recessed at an upper end thereof;
An upper core coupled to a lower surface of the upper plate and having a punch hole formed at a lower end thereof and relatively lifted and lowered relative to the lower core;
A punch rod having an upper end supported by the upper plate, a lower end inserted into the punch hole and installed inside the upper core, and a lower end formed with a forming pin protruding from the lower end to press the metal thin plate into a molding groove to form an embossing projection;
And a core guider installed so as to be extrapolated to the lower core and the upper core for guiding straight up and down of the upper core to the lower core. The method according to claim 1,
The die rod and the punch rod have a stepped portion at the tip end so as to be engaged when the die hole and the punch hole are inserted, and the rear end is extended so as to protrude from the lower end of the lower die core and the upper end of the upper die core, ,
Wherein a supporting pocket is formed on the lower surface of the lower plate and the lower surface of the upper plate so as to support the rear ends of the protruding die rod and the punch rod, respectively. A method of forming an embossing projection using a forming die according to claim 1,
Three pairs of the above-mentioned forming dies are prepared as a primary die, a secondary die, and a tertiary die,
The diameter of the forming pins of the primary mold, the secondary mold, and the tertiary mold gradually decreases from the primary mold to the tertiary mold, and the protrusion height gradually increases. So that the diameter gradually decreases from the primary mold to the tertiary mold,
Wherein a plurality of embossing projections are formed on the metal thin plate by sequentially pressing the metal thin plates to be formed with the primary metal mold, the secondary metal mold and the tertiary metal mold. / RTI &gt; The method of claim 3,
Characterized in that a metal thin plate is placed in a vacuum heating furnace and subjected to a vacuum heat treatment so as to improve the elongation of the metal thin plate to be formed before pressing the thin metal plate with the primary metal mold. Lt; / RTI &gt;

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