KR101982564B1 - Forming method for patterned metal bar - Google Patents

Abstract

The present invention relates to a method for forming a pattern of dissimilar metallic materials, which comprises a cladding portion fabricating step for fabricating a hollow cladding portion, a pattern re-fabricating step for fabricating a pattern material having a polygonal columnar shape by using a metal material, A pattern rearranging step of rearranging the plurality of pattern materials arranged in the pattern rearranging step, a plurality of pattern materials arranged in the pattern rearranging step are fixed to each other to form a pattern material bundle, A core part processing step of processing the core part into a circular core part, an assembling step of inserting the core part into the cladding part to make a bar material, a joining step of joining a finishing material to both ends of the assembled bar material, Temperature homogeneous pressing step for sintering the sintered bar material, a cutting step for cutting the sintered bar material in the radial direction, And the post-processing step of manufacturing the metal workpiece by machining the metal rod, thereby increasing the binding force of the different kinds of metal materials and enabling the expression of a fine pattern.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for forming a pattern of a metal material,

The present invention relates to a method of forming a pattern of dissimilar metallic materials, and more particularly to a method of forming a pattern of a dissimilar metallic material for producing coin (coin), coin and metal plate, cup,

In the case of coin (electrification), coin and metal plate, it is necessary to introduce shapes, patterns and the like using various colors in order to give an aesthetic feeling.

However, when painting or the like is performed using a dye or the like for aesthetics, the color may change due to scratching or oxidation. In addition, the metal type has a unique color depending on each component, so that it can give a natural and luxurious feeling when used.

However, when using a different kind of metal, the possibility of product damage due to differences in physical properties (expansion rate, specific heat, melting point, density) and chemical properties (redox reactivity, acid base reactivity, etc.) And there is a probability that defects will occur in the manufacturing process.

Korean Patent Publication No. 2015-0000865 accordingly discloses an outer ring and two inserts stacked on top of each other and disposed within the outer ring, wherein the outer ring and the two inserts are made of different materials The outer ring and the two inserts were secured together by a plurality of recesses formed in the outer circumferential surface of the insert. The structure may further include at least one intermediate layer disposed between the inserts for joining the two inserts together.

However, in this case, a large metal pattern can be realized, but there is a limit to express a detailed pattern, and there is a possibility that each metal material is separated from each other due to weak bonding force.

Korean Laid-Open Publication No. 2015-0000865 (2015.01.05)

The present invention has been made in order to overcome the problems of the conventional patterning method of different metal materials as described above and provides a method of forming a pattern of a dissimilar metal material capable of increasing the bonding force of different metal materials and capable of expressing a fine pattern It has its purpose.

According to another aspect of the present invention, there is provided a method of forming a pattern of a dissimilar metallic material, the method including the steps of: forming a cladding part for fabricating a hollow cladding part; patterning a pattern material for fabricating a polygonal columnar pattern material A surface cleaning step of cleaning the surface of the pattern material fabricated in the cladding part and the pattern manufacturing step in the cladding part manufacturing step, the step of cleaning the pattern material of the homogeneous or heterogeneous material washed in the surface cleaning step, A pattern re-arrangement step of arranging the plurality of pattern materials arranged in the pattern re-arrangement step such that a gap is not formed between the plurality of pattern materials arranged in the pattern re-arrangement step, A pattern re-bundle is formed so as to be insertable into the hollow of the cladding portion, A step of joining the finishing material to both ends in the axial direction of the bar material assembled in the assembling step; a step of joining the finishing material to the both ends of the bar material assembled in the assembling step; A high temperature uniform pressurizing step of pressurizing the bar material finishing in the finish material joining step toward a radial center while heating the bar material, a cutting step of radially cutting the bar material after the hot uniform pressurizing step, And a post-processing step of processing the bar material to produce a metal workpiece.

At this time, in the high-temperature homogeneous pressurization step, the temperature is increased from not less than 2.0 ° C / min to not more than 3.0 ° C / min up to a temperature of not less than 750 ° C and not more than 800 ° C, It is also possible to maintain the pressure and the temperature for not less than 230 minutes but not more than 250 minutes.

According to another aspect of the present invention, there is provided a method of manufacturing a cladding part, the method comprising: fabricating a cladding part for fabricating a hollow cladding part; forming a pattern material of a polygonal columnar shape using a metal material; A surface cleaning step of cleaning the surface of the pattern material manufactured in the cladding part and the pattern manufacturing step in the cladding part manufacturing step, a step of cleaning the surface of the pattern material manufactured in the step of fabricating the cladding part, A pattern re-arrangement step of arranging the pattern material so that no gap is formed between the pattern materials; an affixing step of forming a pattern re-bundle by fixing a plurality of the pattern materials arranged in the pattern re- Wherein the pattern bundle is joined so that it can be inserted into the hollow portion of the cladding portion, A core portion machining step of forming the core portion having the circular shape, an assembling step of inserting the core portion machined in the core portion machining step into the cladding portion to form a bar material, and a finishing material at both axial ends of the bar material assembled in the assembling step A high temperature uniform pressurizing step of pressing the bar finished in the joining step to the radial center while heating the bar finished in the joining step, a cutting step of radially cutting the bar through the hot press step, And a post-processing step of processing the bar material cut in the cutting step to produce a metal workpiece, wherein the pattern is formed by a patterning method of a dissimilar metal material.

As described above, according to the method of forming a pattern of a dissimilar metallic material according to the present invention, it is possible to express a detailed pattern by bonding various kinds of metal materials.

FIG. 1 is a flowchart illustrating a method of forming a pattern of a dissimilar metal material according to an embodiment of the present invention. FIG.
2 is a perspective view of the cladding portion of the present invention,
3 is a perspective view of the pattern material of the present invention,
FIG. 4A is a perspective view of the pattern bundle after the step of contacting according to the present embodiment, FIG.
FIG. 4B is a perspective view of the core portion after the core portion processing step according to the present embodiment,
5 is a photograph of the core part according to the present embodiment,
6 is a conceptual view of the finish material joining step of this embodiment,
FIG. 7 is a graph showing a photograph of a rod material having undergone the finish material joining step in this embodiment
8 is a conceptual diagram for the high temperature uniform pressurization step of this embodiment,
FIG. 9 is a photograph of a rod subjected to a high-temperature uniform pressing step in this embodiment,
10 is a photograph of a metal material on which a pattern is formed according to the present invention,
Fig. 11 is a photograph showing coins, cups, paintings,
12 is a flowchart of a method of forming a pattern of a dissimilar metal material according to another embodiment of the present invention,
13 to 15 are views showing the fixing jig according to the embodiment of FIG. 12,
16 is a flowchart of a method of forming a pattern of a dissimilar metal material according to still another embodiment of the present invention,
17 is a conceptual view showing a cladding portion and a pattern re-arrangement state according to the embodiment of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment

Referring to FIG. 1, a method for forming a cross-section pattern of a metal rod according to an embodiment of the present invention includes steps of fabricating a cladding part S10, pattern manufacturing step S20, surface cleaning step S30, (Step S40), a joining step S50, a core part machining step S60, an assembling step S70, a finish material joining step S80, a high temperature uniform pressing step S90, a cutting step S100, ).

First, referring to FIG. 2, in the cladding part fabricating step S10, a cladding part 11 having a circular tube-shaped cross section is fabricated by using a metal material.

Referring to FIG. 3, the pattern material 21a having a polygonal column shape is manufactured using various kinds of metal materials in the pattern production step S20. Accordingly, a plurality of pattern materials 21a having inherent colors are formed according to the respective metal materials. In the present embodiment, the pattern material 21a is shown as a quadrangular prism. However, the pattern material 21a is not limited to a quadrangular prism.

In the surface cleaning step S30, the surface of the pattern material 21a fabricated in the cladding portion 11 and the pattern manufacturing step S20 manufactured in the cladding portion fabrication step S10 is cleaned. In this case, various kinds of cleaning methods can be applied. In this embodiment, copper (Cu) and copper-based alloys are made of inorganic acid such as nitric acid (HNO ₃ ), aluminum (Al) The surface oxidation scale removal method using the chemical reaction of the metal is used. Also, the surface cleaning step S30 may include a rinse process in which the surface is peeled off using DI water (deionized water) and alcohol.

In the pattern rearranging step S40, a pattern is formed using the plurality of cleaned pattern materials 21a. In other words, the pattern material 21a is arranged in accordance with a previously designed pattern using various kinds of pattern materials 21a having respective intrinsic colors. At this time, if a gap is formed between the pattern materials 21a, the pattern after the processing may be affected, and separation may occur between the metal materials, so that each pattern having a polygonal column shape And the ashes 21a are stacked while being in surface contact with each other.

Referring to FIG. 4A, in step S50, the pattern material bundle 21 is formed by bonding the pattern materials 21a arranged in the pattern rearranging step S40 to each other. The pattern material bundle after the step S50 is subjected to a change in the arrangement of the pattern material 21a or a part of the pattern material 21a during the core portion processing step S60 and the assembling step S70 It does not fall off. However, in the present embodiment, the pattern material bundle 21 is formed by contact with heat. In this case, since the end portions of the pattern material 21a made of a metal material are melted and bonded to each other, there is an advantage that they can be easily joined together.

Referring to FIGS. 4B and 5, in the core portion processing step S60, the pattern bundle 21 joined in the joining step S50 is inserted into the hollow of the cladding portion 11, The pattern re-bundle 21 is processed to form a core portion 22 having a circular cross section. In the core part processing step (S60), the pattern material bundle (21) in the shape of a quadrangular prism is formed into a cylindrical shape through processes such as wire cutting and turning.

For example, in the case of turning, a large rectangular pattern material bundle 21, in which a plurality of pattern materials 21a are welded in a bundle (S50), is cut into a circular bundle by machining. That is, both end portions of the pattern material bundle 21 in the shape of a quadratic column are fixed to the main shaft of the lathe, and then the die is cut into a cylindrical shape while being rotated.

When the pattern re-bundle 21 is subjected to lathe processing, the core portion 22 includes a plurality of central portions 22a maintaining the shape of the pattern material 21a, a core portion machining step S60, And a welding portion 22c joining the center portion 22a and the machining portion 22b to each other.

In the assembling step (S70), the core part (22) cut in the core part processing step (S60) is inserted into the cladding part (11) to form the bar material (1).

6 and 7, the first and second finishing materials 101 and 102 are attached to both ends of the rod material 1 in the axial direction of the rod material 1 assembled in the assembling step S70, . The present invention includes various bonding methods, but in the present embodiment, it is welded with an electron beam (EB). At this time, the rod 1, the first finishing material 101, and the second finishing material 102 are welded with a vacuum condition applied to the inner space of the cladding portion 11. [

Referring to FIG. 8, in the high-temperature uniform pressurizing step S90, the rod 1 welded in the finish material joining step S80 is sealed in the chamber 103 and isotropically pressed by an inert gas Hot Isostatic Press (HIP). Accordingly, the rod 1 is pressed toward the center in the radial direction, and is joined to the sintered cladding portion 12 and the small-diameter fish portion 23 together. At this time, pressurized at a pressure of 90 MPa or more and 110 MPa or less for 230 minutes or more and 250 minutes or less under an inert gas, and the temperature is increased from 2.0 degrees / min to 3.0 degrees / min And the temperature is maintained for not less than 230 minutes but not longer than 250 minutes. If the pressure is less than 90 MPa or the temperature is less than 750 degrees Celsius, there is a possibility that the sintered cladding portion 12 and the bare core portion 23 are weakly separated from each other and the pressure is higher than 110 MPa, The deformation may occur in the sintered cladding portion 12 or the small-diameter portion 23. Further, when the pressure and the temperature are maintained for less than 230 minutes or the temperature is raised at a rate of less than 2.0 degrees / min, the bonding force between the sintered cladding portion 12 and the small- 23), there is a possibility that they are separated from each other due to weak binding force between the respective metal materials. When the pressure and temperature are maintained for more than 250 minutes or when the temperature is raised at a rate exceeding 3.0 degrees / min, Deformation may occur due to differences.

FIG. 9 shows a machining bar 1 'processed through the high-temperature uniform pressing step S90. The sintered cladding portion 12 covers both end portions of the sintered cord portion 23 in the axial direction while the processing rod 1 'is subjected to the high-temperature uniform pressing step S90.

Referring to FIG. 10, in the cutting step S100, the machining rod 1 'having undergone the high-temperature uniform pressing step S90 is radially cut. At this time, the cutting thickness of the processing bar 1 'can be adjusted according to the purpose of the workpiece to be produced.

In the post-machining step S110, the machining bar 1 'cut in the cutting step S100 is machined to produce a metal workpiece. At this time, it can be processed according to the shape of the workpiece through a CNC lathe or a press.

11 shows an example of a product that has undergone the processing step S110 in this embodiment. In the case of a coin (coin) and a coin, cutting is performed to a predetermined thickness in the cutting step (S100), and fillet processing (processing to form a jaw at a radial end portion) On the other hand, in the case of a commodity such as a cup or a paint, which emphasizes the aesthetics of the side surface as well as the side surface, it is cut to a predetermined thickness in the cutting step S100 and then cut using a CNC lathe or the like in the post- The shape of the outer peripheral surface and the inner peripheral surface can be processed. In this case, as the radius of the workpiece changes, various patterns can be displayed.

Second Embodiment

Referring to FIG. 12, a method for forming a cross-section pattern of a metal rod according to an embodiment of the present invention includes the steps of fabricating a cladding part S210, pattern manufacturing step S220, surface cleaning step S230, (Step S240), a jig fixing step S250, a core part manufacturing step S260, an assembling step S270, a finish material joining step S280, a high temperature uniform pressing step S290, a cutting step S300, ).

In the cladding part manufacturing step (S210), the pattern manufacturing step S220, the surface cleaning step S230 and the pattern re-arranging step S240 of the present embodiment, the cladding part manufacturing step S10 of the first embodiment, (S20), the surface cleaning step (S30), and the pattern rearrangement step (S40).

If the welding is performed in the joining step (S50) of the first embodiment, the quality of the product may be deteriorated as the surface of the joining portion is oxidized. However, there is a problem that the surface cleaning process is further required after the welding, but the cleaning process is not easy in the bonded state. In order to overcome this, in this embodiment, a jig fixing step S250 for fixing the pattern material bundle 121 with a jig is performed in place of the joining step S50 by welding, and then a core part processing step S260).

Referring to FIGS. 13 to 15, in the jig fixing step S250, the core portion processing step S250 is performed in a state where the pattern stack bundle 121 is fixed to the rectangular fixing jig 200. FIG. In the core portion processing step S250, the pattern material bundle 121 is processed into a cylindrical shape by lathe processing. The pattern re-bundle 121 forms a bundle of squares before the lathe processing, so that the rectangular shape is fixed by the rectangular fixing jig 200.

The rectangular fixing jig 200 includes a jig plate 210 for supporting the outer surface of the pattern bundle 121, a first fixing bolt 220 for pressing the jig plate 210, And a rectangular frame 230 through which the bolts 220 are inserted and fastened.

The jig plate 210 is provided with four pieces to support slopes of the pattern material bundle 121, that is, upper and lower surfaces and both side surfaces. The rectangular frame 230 is formed larger than the pattern bundle 121 so that the four jig plates 210 can be positioned inside the pattern bundle 121. The jig plate 210 is pressed by tightening the first fixing bolt 220 while the square frame 230 and the jig plate 210 are fitted around the pattern reamer 121, Of the pattern reamer 121 supports the outer side surfaces of the pattern reamer 121 so that the pattern reamer 121 keeps a rectangular bundle shape firmly. A plurality of the rectangular fixing jigs 200 may be provided along the longitudinal direction of the pattern material bundle 121 at predetermined intervals.

When the pattern material bundles 121 are fixed in the shape of a square bundle by the rectangular fixing jig 200, the both ends of the pattern material bundles 121 are lathed to the main spindle of the lathe. When the lathe machining is started in the core part machining step S250, the pattern material bundle 121 is partially machined into a cylindrical shape, and a rectangular column shape and a cylindrical shape coexist before the machining process. In this intermediate machining process, After stopping the operation and separating the pattern re-bundle 121 from the main spindle, the rectangular fixing jig 200 is disassembled and removed and replaced with the circular fixing jig 300.

15, the circular fixing jig 300 is a jig for fixing the pattern material bundle 121 by supporting the outer circumferential surface of the cylindrical cut portion, an arc-shaped jig 310, A second fixing bolt 320 for pressing the jig member, and a circular frame 330 through which the second fixing bolt 320 is inserted.

The circular frame 330 is formed in a cylindrical shape, and the jig member 310 is provided with two circular or semicircular shapes to support the outer peripheral surface of the patterned sheet bundle 121 processed into a cylindrical shape. The circular frame 330 is sandwiched with the jig member 310 at one end of the pattern material bundle 121 in a state where the lathe processing is stopped and the pattern re-bundle 121 is separated from the main shaft, 320) to press the jig member (310). The circular fixing jig 300 supports the pattern bundle 121 in a state where the rectangular fixing jig 200 is removed. A plurality of the circular fixing jigs 300 may be provided along the longitudinal direction of the pattern material bundle 121 at predetermined intervals. It is also possible to use the circular fixing jig 300 together without removing the rectangular fixing jig 200 according to the degree of processing of the pattern re-bundle 121.

When the pattern re-bundle 121 is completely formed into a cylindrical shape, the circular fixing jig 300 is also disassembled and then assembled (S270). In the assembling step S270, the circular fixing jig 300 is dismantled and the pattern materials 21a, which are separated one by one, are inserted into the circular cladding part 11. [

When the assembling step S270 is completed, the finishing material joining step S280, the high temperature uniform pressing step S290, the cutting step S300, and the post-finishing step S310 are sequentially performed. In the present embodiment, the finish material joining step S280, the high temperature uniform pressing step S290, the cutting step S300, and the post-finishing step S310 are the same as the final material joining step S80, Is the same step as the cutting step S100 and the post-processing step S110.

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Third Embodiment

Referring to FIG. 16, a method for forming a cross-section pattern of a metal rod according to an exemplary embodiment of the present invention includes forming a cladding portion S410, patterning a pattern S420, cleaning a surface S430, , A finish material joining step S450, a high temperature uniform pressing step S460, a core portion machining step S470, a cutting step S480, and a post-finishing step S490.

In the cladding portion fabricating step (S410), the cladding portion 111 as shown in FIG. 17 is manufactured in a rectangular tube shape. The cladding part 111 is formed in a rectangular tube shape to accommodate a pattern material bundle 122 in the shape of a quadrangular prism with square pattern materials 122a.

After the cladding part 111 is manufactured in the cladding part manufacturing step S410, the surface cleaning step S430 is performed and then the assembling step S440 is performed.

In the assembling step S440, the pattern material 122a is inserted into the cladding part 111 along the pattern. 17 shows a state in which pattern materials 122a are arranged in a pattern in the cladding part 111 in a state where the assembling step S440 is completed.

When the assembling step S440 is completed, the finish material joining step S450 and the high temperature uniform pressing step S460 are sequentially performed. The finish material joining step S450 and the high temperature uniform pressing step S460 of this embodiment are the same as the finishing material joining step S80 and the high temperature uniform pressing step S90 of the first embodiment.

When the high temperature uniform pressing step S460 is completed, the core part processing step S470 is performed. In the core part processing step S470, the cladding part 111 and the pattern material bundle 122, which are integrally sintered through the high-temperature uniform pressing step S460, are cut into a columnar shape with the main shaft of the lathe being cut. In the lathe processing, all the cladding portions 111 are cut and only the sintered pattern material 122a is left in a cylindrical shape. 15, only the sintered pattern material 122a having a cross-sectional shape as shown in FIG. 15 is left in a columnar shape, and the cylindrical sintered pattern material 122a is cut in the radial direction of the circle, .

The cutting step S480 and the post-finishing step S490 of this embodiment are the same as the cutting step S100 and the post-finishing step S110 of the first embodiment.

Therefore, according to the present invention, it is possible to obtain the same processability as that using one metal material while using different kinds (different kinds) of metal materials having different physical and chemical characteristics. In addition, patterns can be expressed using the colors inherent to the respective metals without being subjected to processing such as plating or painting, and aesthetics can be provided without problems such as discoloration and peeling due to use. In addition, the present invention is not limited to simply the pattern of the cross section, but also the pattern of the side surface, the outer circumferential surface and the inner circumferential surface can be configured, and the present invention can be applied to various applications.

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 embodiments, but, on the contrary, It is obvious that the modification or the modification is possible by the person.

 It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: Rod material 11: Cladding part
12: sintered cladding part 21:
21a: pattern material 22: core part
23: Barely fisher part 200: Square fixing jig part
210: jig plate 220: first fixing bolt
230: square frame 300: circular fixing jig
310: jig member 320: second fixing bolt
330: Circular frame

Claims (5)

A cladding portion fabricating step (S10) of fabricating a hollow cladding portion;
(S20) of fabricating a pattern material in the form of a polygonal column using a metal material;
A surface cleaning step (S30) of cleaning the surface of the cladding part fabricated in the cladding part fabrication step and the pattern material fabricated in the pattern manufacturing step;
(S40) of arranging the pattern material of a homogeneous or heterogeneous material washed in the surface cleaning step so that no gap is generated between the pattern materials;
(S50) a plurality of pattern materials arranged in the pattern rearrangement step are fixed to each other to form a pattern material bundle;
(S60) a core portion machining step (S60) of forming a core portion having a circular cross section by processing the pattern material bundle joined in the joining step so as to be insertable into the hollow of the cladding portion;
An assembling step (S70) of inserting the core part processed in the core part processing step into the cladding part to make a bar material;
A finishing material joining step (S80) of joining the finishing material to both axial ends of the bar material assembled in the assembling step;
A high-temperature homogeneous pressing step (S90) of heating the bar finished in the finishing material bonding step while pressing it toward the radial center;
A cutting step (S100) of cutting the bar having been subjected to the high-temperature uniform pressing step in a radial direction; And
A post-processing step (S110) of processing the bar material cut in the cutting step to produce a metal workpiece;
≪ / RTI > The method according to claim 1,
In the high-temperature uniform pressurization step (S90)
The temperature is increased from not less than 2.0 degrees / min to not more than 800 degrees Celsius and not less than 3.0 degrees Celsius / min as the inert gas is injected under a pressure of not less than 90 MPa and not more than 110 MPa, Lt; RTI ID = 0.0 > pressure / temperature. ≪ / RTI > A cladding portion fabricating step S210 for fabricating a hollow cladding portion;
A pattern re-manufacturing step S220 of fabricating a quadrangular prism pattern material using a metal material;
A surface cleaning step (S230) of cleaning the surface of the cladding part fabricated in the cladding part manufacturing step and the pattern material fabricated in the pattern manufacturing step;
A pattern material disposing step (S240) of disposing the pattern material of a homogeneous or heterogeneous material washed in the surface cleaning step so that no gap is generated between the pattern materials;
A jig fixing step S250 of fixing the pattern material bundle 121 to at least one of the rectangular fixing jig 200 and the circular fixing jig 300;
A core portion machining step (S260) of turning the patterned sheet bundle (121) fixed in the jig fixing step into a cylindrical shape;
An assembling step (S270) of removing the circular fixing jig 300 after the core part processing step and inserting pattern materials into the cladding part;
A finishing material joining step (S280) of joining the finishing material to both axial ends of the bar material assembled in the assembling step;
A high-temperature uniform pressurization step (S290) of pressing the bar finished in the finish material joining step to a radial center while heating;
A cutting step (S300) of cutting the bar having been subjected to the high-temperature uniform pressing step in the radial direction; And
A post-processing step (S310) of processing the bar material cut in the cutting step to produce a metal workpiece;
Lt; / RTI >
The rectangular fixing jig 200 includes a jig plate 210 for supporting the outer surface of the pattern bundle 121, a first fixing bolt 220 for pressing the jig plate 210, And a rectangular frame 230 through which the bolts 220 are inserted,
The circular fixing jig 300 is a jig for fixing the pattern material bundle 121 by supporting the outer circumferential surface of the cut part in the shape of a cylinder. The circular fixing jig 300 includes an arcuate jig member 310, A fixing bolt (320), and a circular frame (330) through which the second fixing bolt (320) is inserted.
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