KR20070103592A - Method of fabricating metal-form with a hollow and the metal-form therefrom - Google Patents

Abstract

A method of manufacturing a hollow metal body and a metal body manufactured using the method thereof are provided to produce a light and tightly adhered metal body having enhanced durability capable of sustaining external force by forming a first metal body having a recessed portion with stepped ends along an outer rims and by forming a second metal body having a projected portion having an end formed in step or trench shapes to fit into the end of the first metal, thereby allowing the two metal bodies to tightly adhere to one another. A method of manufacturing a hollow metal body comprises the steps of: molding a first metal member wherein a center section has a recessed portion towards one direction compared to bordering positions of inner and outer edges(ST102); forming a second metal member which is to be adhered along the circumference of the first metal member so as to allow the recessed portion of the first metal to form a hollow section(ST104); adhering first and second metal bodies by opposing the two metal bodies(ST106); and continuously plasma welding along the adhered section of the two metal bodies(ST108). First and second metal bodies are symmetrical with respect to interfaces of the two metal bodies. The interface of the first metal adhering to the second metal body is projected either towards inner width or outer width of the interface of the first metal body, and an end of the projected portion is shaped as a staircase. The interface of the second metal is projected outwards and an end is shaped as a step or a trench to allow tight adherence with the stepped portion of the first metal. At least one of the projecting portions of first and second metal bodies are fitted to the projecting section of the other for tight adherence.

Description

Method of fabricating metal-form with a hollow and the metal-form therefrom

1 is a cross-sectional view showing a metal body having a hollow according to the prior art.

2A or 2B is a perspective view schematically illustrating a metal body having various shapes of hollows and a manufacturing process thereof according to one embodiment of the present invention.

3 is a cross-sectional view showing the shape of the interface portion and the coupling relationship thereof based on the III-III line shown in FIGS. 2A and 2B.

4A and 4B are flowcharts illustrating a manufacturing process of the first and second metal members.

Figure 5 is a flow chart showing a metal body manufacturing process having a hollow according to an embodiment of the present invention.

6 is a cross-sectional view for describing a hollow metal body and a manufacturing process thereof according to another embodiment of the present invention.

The present invention is made of a ferrous or non-ferrous metal, including a magnetic material and a conventional alloy material to form a hollow inside the metal body forming a constant volume shape to maintain the airtight to achieve lightweight and at the same time secure durability in response to external impact It relates to a method for producing a metal body having a hollow, and a metal body produced therefrom.

In general, ornaments including various components or components constituting the product or accessories, etc. require a certain degree of durability so that there is no deformation in response to physical forces. Especially for various ornaments and accessories, surface gloss is also an important measure of product value.

For this reason, various parts and accessories are made of metal materials such as ferrous or nonferrous metals and various alloys in order to satisfy the conditions of durability and surface gloss.

However, metallic materials are limited in size and use due to their high weight per unit volume.

In order to improve the above-mentioned problem, a study for forming a hollow inside of a metal body (metal body) has been attempted, and with reference to utility model registration No. 336838, a known conventional technology will be described.

Looking at the technical process of Utility Model Registration No. 336838, the metal sheet is drawn into a hemispherical shape using a press die. At this time, the hemispherical edge portion is formed to protrude further than the substantially hemispherical shape.

The hemispherical metal plate formed as described above is pressed against both sides in a state where the two sides are spherically formed in a spherical shape, and at the same time, power is applied to weld the sparks on the surfaces in contact with each other. After that, the hemispherical joint surface portion forms a shape in which a burr by melting protrudes outward of a spherical shape, and polishes it with a grinder to produce a spherical shape.

However, this technique has the following problems.

First, there is a wide interfacing interface, so that the flow of current is uneven, and as the current flows through the selectively joined area by the pressing force, the remaining parts are not uniformly bonded, so that the local unevenness occurs. A defect such as forming a joint or having a weak bonding strength and having a biased shape toward one side occurs.

Second, the internal temperature and pressure in the process of bonding to each other rapidly rises, from which the internal gas is discharged through the weak bonding area. As a result, these sites form holes or gaps in the joints, and also cause gaps in the post-processing grinding process, even though welding has been performed.

Third, as the metal plate is made of hemispherical shape, there are many difficulties in aligning each other to correspond to each other, and even if temporary alignment is made, problems such as misalignment and deformation of the sample are caused during mutual pressurization. .

Fourth, the above-described alignment and complete welding takes a lot of time, and the consumption of electricity is also increased, resulting in low productivity, efficiency, and economic efficiency, high defect rate, and low yield, which are not suitable for mass production systems.

On the other hand, another method for manufacturing a hollow metal body is a method of welding the interface with a laser while the two hemispherical specimens are aligned to correspond to each other, but it takes a long time to weld and joins the welding part. There was a problem of low yield, such as easy separation in the process of grinding or barrel process due to the weak strength.

The present invention has been developed to solve the above problems, in the manufacture of a metal body having a certain shape and volume consisting of a metal material including a magnetic body, to form a hollow inside of the metal body to reduce the weight, the hollow interior Method of manufacturing a metal body having a hollow to maintain the air tightness of the surface to have sufficient durability in response to external shocks, and to uniformly stabilize and stabilize the surface coating by the metal material to extend the gloss of the surface long and To provide a metal body obtained from.

A feature of the hollow metal body manufacturing method according to an embodiment of the present invention for achieving the above object is a) to form a first metal piece having a central portion concave in at least one direction than the boundary position of the edge Steps; b) forming a second metal piece in close contact with the circumference of the first metal piece so that the concave portion of the first metal piece is hollow; c) contacting and fixing the first and second metal pieces in close contact with each other; And d) plasma welding continuously along closely contacted portions of the first and second metal pieces.

On the other hand, the metal body manufacturing method having a hollow according to another embodiment of the present invention for achieving the above object, a) a first metal member having a central portion is concave in at least one direction than the inner and outer edge boundary position; Forming a; b) forming a second metal member in close contact with each circumference of the first metal member such that the recessed portion of the first metal member is hollow; c) forming a ring-shaped brazing sheet corresponding to the interface facing the first and second metal members; d) placing the brazing sheet between the first and second metal members corresponding to each other and closely fixing each other; e) applying a pressure in a direction in which the first and second metal members are in close contact with each other, and applying and welding a current therebetween.

Hereinafter, a method of manufacturing a metal body having a hollow according to each embodiment of the present invention, a manufacturing system thereof, and a metal body obtained therefrom will be described with reference to the accompanying drawings.

Looking at the method of manufacturing a metal body having a hollow according to the present invention, as shown in Fig. 2a or 2b and 5, first the center portion has a first concave portion at least in one direction than the inner and outer edge boundary position Metal members 20a and 22a are formed (ST102).

Here, the concave portions of the first metal members 20a and 22a are expressed in a concave shape in one direction with respect to the entire inner portion with respect to the edge of the edge in the drawing, but only one portion of the inner portions has the concave portion. The site may, of course, be formed into a convex shape that partitions the hollow in a flat plate or in the opposite direction.

Subsequently, a second metal that is in close contact with each circumference of the first metal members 20a and 22a so as to correspond to the first metal members 20a and 22a so that the concave portions of the first metal members 20a and 22a are hollow. The members 20b and 22b are formed (ST104).

At this time, the second metal members 20b and 22b are symmetrical to the corresponding first metal members 20a and 22a, that is, the first metal members 20a and 22b and the second metal members 20b and 22b are identical to each other. It may be in the shape. In addition, they may be formed so as to be symmetrical at least only the appearance shape based on the interface position that is in close contact with each other and exposed to the outside.

On the other hand, any one of the first and second metal members 20a, 20b thus produced is enlarged in FIG. Either side protrudes and the cross section forms a step shape. In addition, another one corresponding thereto is formed by forming a step or trench shape so that the edge portion exposed to the outside is in close contact with the interface of the stepped cross-sectional shape described above.

Such a shape is such that the first and second metal members 20a, 22a, 20b, and 22b are brought into close contact with each other so as to be in close contact with each other. The protruding portion exposed to the outside is in close contact with the mating interface (ST106).

In addition, the inner wall or the outer wall of any one of the first and second metal members 20a, 22a, 20b, and 22b protrudes from a certain angle range so that the female and male socket insertion joints are easily formed based on the interface. It may be formed to have an inclined surface.

In addition, as shown in FIGS. 4A and 4B, the inner wall or the outer wall of at least one of the first and second metal members 20a, 22a, 20b, and 22b protrudes from each other to be in close contact with each other. It is preferable to form the protrusion to have a close contact with the engaging state. Such a protrusion may be formed by forming a forging type after drawing a plate in the process of forming the first and second metal members 20a, 22a, 20b, and 22b.

In addition, each interface portion of the first and second metal members 20a, 22a, 20b, and 22b described above may further perform a polishing process or a cleaning process to improve adhesion between each other. From this, the interface between which the first and second metal members 20a, 22a, 20b, and 22b are bonded to each other can be expected to have an effect of improving the airtightness of the interior in response to the concave portion formed in the hollow. will be.

On the other hand, the edge portion of any one of the first, second metal member (20a, 22a, 20b, 22b) can be formed to have a flange for providing the reference in the process of aligning with each other, so formed One flange is preferably intended to be easily removed by processes such as grinding, cutting and cutting in post processing.

As another method for aligning the first and second metal members 20a, 22a, 20b, and 22b, the surface of at least one of the first and second metal members 20a, 22a, 20b, and 22b may be disposed on the surface of the first and second metal members 20a, 22a, 20b, and 22b. It can be formed to have an embossed site.

Here, in the case of the above-described flange may further comprise an alignment jig (not shown) to be aligned in the process of supporting the flange of the shape protruding along the interface, the alignment to the embossed portion is It may be further provided with another alignment jig (not shown) of the shape fitted.

As described above, when the manufactured first and second metal members 20a, 22a, 20b, and 22b are aligned in close contact with each other, the plasma welding nozzles (not shown) are placed in close proximity to the interface therebetween. And welding is continuously performed along the interface (ST108). In this case, the welding method may include the first and second metal members 20a, 22a, 20b, and 22b so that the interface between the first and second metal members 20a, 22a, 20b, and 22b is continuously positioned in correspondence with the plasma welding nozzle. You can proceed by rotating or rotating and moving the position. Alternatively, welding may be performed in the process of moving the above-described plasma welding nozzle along the interface in a state in which the first and second metal members 20a, 22a, 20b, and 22b are closely fixed to each other.

In addition to such plasma welding, laser welding of the first and second metal members 20a, 22a, 20b, and 22b which are in close contact with each other may be performed in parallel, and when there is a lift between these interfaces, or to increase the bonding strength thereof. As a method, plasma welding may be performed while supplying powder reacting with the first and second metal members 20a, 22a, 20b, and 22b. Attention here is to ensure that the welded site does not have a recessed area. In addition, the first and second metal members 20a, 22a, 20b, and 22b may be the same materials.

Above all, the interface portions of the first and second metal members 20a, 22a, 20b and 22b, which are plasma-welded to the surfaces of the first and second metal members 20a, 22a, 20b and 22b, are spaced at regular intervals. It is preferable to further include a cooling jig (not shown) which covers the remaining part in close contact with the exposed part and heat-exchanges to cool the first and second metal members 20a, 22a, 20b, and 22b.

The exposed interface portion of the first and second metal members 20a, 22a, 20b, and 22b by the cooling jig, that is, the above-described predetermined interval is preferably in the range of 0.5 to 2 mm.

In addition, the above-described cooling jig is made of chromium and a copper alloy, and may be formed to be in close contact with the surface of the first and second metal members 20a, 22a, 20b, and 22b to the maximum area. In addition, the above-described cooling jig may be configured to further connect the cooling system to the circulation of the refrigerant therein.

On the other hand, following the above-described process, the grinding process (ST110), the barrel process (ST112) and the coating process (ST114) are further sequentially performed.

On the other hand, in the method of manufacturing a metal body having a hollow according to another embodiment of the present invention and the metal body obtained therefrom, as shown in Fig. 6, the center portion is a portion that is concave in at least one direction than the inner and outer edge boundary position Forming a first metal member having a second shape, and forming a second metal member in close contact with each circumference of the first metal member such that the recessed portion of the first metal member has a hollow shape. It includes the process of manufacturing the second metal member (30a, 30b).

Thereafter, the step of forming a ring-shaped brazing sheet corresponding to an interface between the first and second metal members 30a and 30b and the brazing sheet between the first and second metal members 30a and 30b which are mutually opposed to each other. The sheet 32 may be placed and fixed in close contact with each other, and pressure may be applied in a direction in which the first and second metal members 30a and 30b are in close contact with each other, and a current may be applied and welded therebetween.

The surface of the metal body having a hollow obtained by this process is a band having a predetermined thickness protrudingly formed along the interface of the above-described edge portion of the brazing sheet, that is, the first and second metal members 30a and 30b. It is preferable to remove by a grinding | polishing process and a barrel process.

According to the present invention, in the manufacture of a metal body having a certain shape and volume consisting of a metal material including a magnetic body, welding by reducing the high temperature and high pressure acting on the hollow portion inside the metal body with a cooling jig and stably welding The strength is sufficiently improved, and the inner hollow is airtight, so as to cope with external force, sufficient elasticity and sufficient durability are secured, and the hollow itself has a weight reduction effect.

In addition, it is made of a metal material, as the welding strength is improved, the surface is smoothly polished, so that surface polishing and heat treatment are easy, and uniformity and stabilization of the surface coating by the metal material can be obtained, which can prolong the gloss of the surface. It works.

Claims (19)

a) forming a first metal member having a central portion that has a recessed portion in at least one direction than an inner and outer edge boundary position; b) forming a second metal member in close contact with each circumference of the first metal member such that the recessed portion of the first metal member is hollow; c) contacting and fixing the first and second metal members in close contact with each other; d) plasma welding continuously along closely contacted portions of the first and second metal members; Metal body manufacturing method having a hollow, characterized in that comprises a. The method of claim 1, In the steps a) and b), the shape of the first and second metal members is formed to be symmetrical with respect to the interface where the close contact is made. The method of claim 1, In the step a), the first metal member is formed such that one side of the inner side or the outer side in the width direction protrudes along the shape at an interface contacting the second metal member to form a stepped cross section, In step b), the second metal member is formed such that the cross section forms a step or trench shape so that the edge portion exposed to the outside at least along the step-shaped interface of the first metal member is in close contact. c) in the step, wherein the protruding portion of any one of the first, the second metal member is inserted into the inside of the other protruding portion to keep in close contact with the hollow. The method of claim 3, wherein In steps a) and b), the inner wall or the outer wall of the protruding portion of any one of the first and second metal members may be formed as an inclined surface having a predetermined angular range so as to form socket insertion joints with respect to the interface. The metal body manufacturing method which has the said hollow. The method of claim 3, wherein In steps a) and b), protrusions for maintaining close contact with each other by engaging the inner wall or outer wall of the protruding portion of at least one of the first and second metal members by step c). Method for producing a metal body with the hollow, characterized in that formed to have. The method of claim 1, The first and second metal members obtained by steps a) and b) are further subjected to a polishing process so as to increase the airtightness due to the close contact with each other with respect to the interface corresponding to each other. Manufacturing method. The method of claim 1, In steps a) and b), at least one of the first and second metal members forms a flange protruding outwardly from an interface in close contact with each other to provide an alignment criterion for mutual matching in step c), And said flange is removed by further performing any one of cutting or grinding prior to step d). The method of claim 1, In steps a) and b), at least one surface of the first and second metal members is formed by forming an embossed portion having a protruding shape so as to provide an alignment criterion for mutual matching in step c). Method for producing a metal body having the hollow. The method of claim 1, and d) performing laser welding on the interface of the first and second metal members in close contact with each other in the step d). The method of claim 1, And the first and second metal members are made of the same material. The method of claim 9, and d) supplying powder of the same material as that of the first and second metal members to the interface of the first and second metal members in the plasma welding process of step d). The method of claim 1, In step d), an interface portion of the first and second metal members on which the plasma welding is performed with respect to the surfaces of the first and second metal members is covered in close contact with the remaining portions so as to be exposed at a predetermined interval. And a cooling jig for exchanging heat to cool the member. The method of claim 11, Method for producing a metal body with the hollow, characterized in that the predetermined interval by the cooling jig to be in the range of 0.5 ~ 2㎜. The method of claim 11, The cooling jig is a metal body manufacturing method having the hollow, characterized in that made of chromium and copper alloy. The method of claim 11, The cooling jig is a metal body manufacturing method having the hollow, characterized in that further made by connecting a cooling system to allow the circulation of the refrigerant therein. The method of claim 1, and d) continuously performing a grinding process, a barrel process, and a coating process after the step d). a) forming a first metal member having a central portion that has a recessed portion in at least one direction than an inner and outer edge boundary position; b) forming a second metal member in close contact with each circumference of the first metal member such that the recessed portion of the first metal member is hollow; c) forming a ring-shaped brazing sheet corresponding to the interface facing the first and second metal members; d) placing the brazing sheet between the first and second metal members corresponding to each other and closely fixing each other; e) applying pressure in a direction in which the first and second metal members are in close contact with each other, applying a current therebetween and welding the same; Metal body manufacturing method having a hollow, characterized in that comprises a. Metal body having a hollow produced by the process according to any one of claims 1 to 16. A metal body having a hollow produced according to claim 17.

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