KR102580814B1 - Real stitch mock-up and manufacturing method for electroforming mold using the same - Google Patents

Abstract

The present invention relates to a real stitch wooden mold and a method of manufacturing an electromagnetic mold using the same. The real stitch wooden mold according to the present invention includes a wooden mold base on which a stitch line groove extending continuously and continuously from the counter-pole insertion groove is formed, and a stitch line groove of the wooden mold base. It includes an elastic resin located inside, a skin of a predetermined pattern attached to the surface of the wooden mold base and inserted into the vertical insertion groove to form a vertical stitch, and with real stitches formed along the stitch line groove. The real stitch wooden mold according to the present invention has a wooden mold base. When forming a real stitch along the stitch line groove after attaching a skin with a predetermined pattern to the surface of the wooden mold base by placing the elastic resin in the continuously extending long stitch line groove, the elastic resin in the stitch line groove is It replaces the role of the lower thread of the sewing thread and holds the upper thread from coming off, so the tension of the sewn thread is maintained at a constant level, so there is no concern about the thread breaking during sewing, the sewing thread loosening after sewing, or sewing defects, and the diameter of the needle or the sewing thread There is no need to specifically control the thickness and material of the real stitch line, and there is no concern about misalignment of the real stitch line. It is also easy to manufacture and economical, and the electromagnetic mold produced using this is used to manufacture automobile interior materials with elaborate and realistic fake stitches. can be used effectively.

Description

Real stitch wooden mold and manufacturing method of electroforming mold using the same {REAL STITCH MOCK-UP AND MANUFACTURING METHOD FOR ELECTROFORMING MOLD USING THE SAME}

The present invention relates to a real stitch wooden mold and a method of manufacturing an electromagnetic mold using the same, and more specifically, to a wooden model base in which an elastic resin is located in the continuously long and continuously extending stitch line groove of the wooden model base, forming a skin of a predetermined pattern. When attached to the surface and forming a real stitch along the stitch line groove, the tension of the upper thread is maintained constant even without the lower thread by the elastic resin in the stitch line groove, and the alignment of the real stitch line is maintained. It relates to a real stitch wooden mold that has no risk of defects and is easy to manufacture, and a method of manufacturing an electromagnetic mold using the same.

In general, various interior materials such as automobile dashboards, glove boxes, consoles, lower covers, pillars, door interior panels, airbag cover panels, etc. are injection molded using electroforming molds to give luxurious texture and aesthetics.

These automobile interior materials are manufactured by joining a soft skin with a luxurious and soft pattern made of PVC, TPO (ThermoPlastic Olefin), PP, PE, PU, or fabric and a hard core, and foam is usually placed between the skin and the core. Resin is interposed.

Recently, as automobiles are rapidly transitioning from internal combustion engine vehicles to electric vehicles, interior parts are also showing many changes. Accordingly, materials such as polyurethane or TPO are being applied to provide furniture-like comfort and a luxurious aesthetic. Fake or real stitches are applied to express a slightly higher level of realism and the luxurious aesthetic of the product.

Conventionally, in attempts to apply stitches, stitches were formed on the surface of an interior material mold for plastic molding using machining or using a laser, but the quality was low.

Therefore, in recent years, in accordance with the trend toward high-end automobile interior materials, automobile interior materials have been manufactured using Jeonju molds with elaborate natural leather texture patterns and fake stitches, but the real stitch wooden molds used in the manufacture of Jeonju molds are used. Due to technical differences in sewing methods and limitations of sewing equipment, there were certain limitations in the quality of the stitch line. In order to solve this problem, very expensive equipment and manufacturing costs had to be invested, so there was a need to improve this.

Generally, the process of forming real stitches on the skin attached to the wooden mold base in a wooden mold for making an electromagnetic mold is to fold the ends of two pieces of skin and place them against each other to form a fold line between the two stitches, and to form a fold line on one or both sides from the fold line. By sewing separate stitch lines at slightly spaced positions, a luxurious and natural aesthetic and texture are created.

When sewing real stitches on such skins, if the surface of the wooden model is a three-dimensional curved shape or a flat round shape, there is a problem that the direction is distorted during sewing, and the stitch thread protrudes too much, making it easy for the protruding stitches to burst.

Typical prior technologies related to stitch-forming automobile interior materials include the following.

Registered Patent Publication No. 10-2076817 (registered on February 26, 2020) proposes a method of manufacturing an electromagnetic mold that can form stitches on vehicle finishing sheets, but this involves manufacturing a stitch specimen mold for scanning stitch lines and using it. This means that a stitch scanned specimen is produced, a pre-processed wooden mold is manufactured using the scanned results, processed to form the final wooden mold, and then a skin is combined on top of the mold to produce an electromagnetic mold. This is not directly related to the formation of a real stitched wooden mold. There is no relevance.

In addition, Registered Patent Publication No. 10-1773138 (registered on August 24, 2017) includes the steps of forming real stitches on both sides of the stitch line of the skin pad using a sewing device and the part of the real skin pad corresponding to the fixing hole of the substrate core. A method of manufacturing vehicle interior materials is proposed that includes the step of forming a through hole by piercing. However, this method relates to automobile interior materials with real stitches, and is used on a wooden mold with real stitches to manufacture automobile interior materials with fake stitches. It is not about.

Registered Patent Publication No. 10-2165285 (registered on October 6, 2020) proposes an insert injection method for interior materials that includes the step of forming a stitch line on the skin using a sewing device, but this method also applies to cars with fake stitches. It is not about wooden molds with real stitches for manufacturing interior materials.

Meanwhile, Registered Patent Publication No. 10-2336226 (registered on December 2, 2021) is a textured fabric fixing frame in which sewing thread insertions are formed at specific intervals; and a texture expression member bonded to the surface of the textured fabric fixing frame and having sewing thread press-fit holes corresponding to the sewing thread insertion portions formed at specific intervals, which are inserted into the sewing thread press-fit holes and the sewing thread insertion portions by a sewing needle. A sewing thread is fixed to the texture expression member by friction with the texture expression member to form a stitch line, and the sewing thread insertion portion is formed as a groove or hole in the textured fabric fixing frame for insertion of the sewing thread, and the textured fabric The fixing frame proposes a stitch wooden mold for manufacturing an electric pole mold, and a method of manufacturing an electric mold using the same, characterized in that a groove forming groove is formed in the texture expression member so that a groove is formed along the stitch line.

However, the stitch wooden mold for manufacturing the Jeonju mold described above includes a sewing thread insertion part spaced at a specific interval between the textured fabric fixing frame and the texture expression member, a sewing thread press hole at a corresponding position, and a hole forming needle that may include a press hole forming guide plate. Since it has to be formed one by one, the work is cumbersome and laborious, and furthermore, in order to keep the sewn sewing thread stable within the sewing thread insertion part, there is a problem that the diameter of the thread loading needle and the thickness and material of the sewing thread must be strictly controlled within a specific range. If not, There is a risk of sewing defects occurring when the real stitch comes loose or the thread loading needle does not enter the sewing thread insertion section smoothly. In addition, if the thread loading needle is not accurately guided into the sewing thread insertion section (insertion hole), the needle may hit the textured fabric holding frame and damage the sewing thread. There is a risk that this will break.

Registered Patent Publication No. 10-2076817 (registered on February 26, 2020) Registered Patent Publication No. 10-1773138 (registered on August 24, 2017) Registered Patent Publication No. 10-2165285 (registered on October 6, 2020) Registered Patent Publication No. 10-2336226 (registered on December 2, 2021)

Therefore, the first object of the present invention is to attach the skin with a predetermined pattern to the surface of the wooden mold base by placing an elastic resin in the continuously extending stitch line groove of the wooden mold base, and then form a real stitch along the stitch line groove. When sewing, the elastic resin in the stitch line groove acts as the lower thread of the sewing thread and holds the upper thread from coming off, so the tension of the sewn thread can be maintained constant, and the elastic resin prevents the thread from breaking or sewing. This is to provide a real stitched wooden model without the risk of the sewing thread loosening or sewing defects.

The second purpose of the present invention is to provide a real stitch wooden model that does not require special control of the diameter of the needle and the thickness and material of the sewing thread.

The third object of the present invention is to provide a real stitch wooden model that is easy to manufacture and highly economical, as well as eliminating the risk of misalignment of the real stitch line by using a continuously extending stitch line groove of the wooden model base.

The fourth object of the present invention is to provide a method of manufacturing an electric pole mold using skin for automobile interior materials of the electric pole mold using the real stitch wooden mold described above.

The first to third objects of the present invention described above include a wooden base having a backing insertion groove and a continuously extending stitch line groove having a width of 0.5 to 5 mm and a depth of 2 to 50 mm; an elastic resin located in the stitch line groove of the wooden mold base and formed by filling an elastic resin monomer or oligomer and then curing it; It is attached to the surface of the wooden mold base and is inserted into the backing insertion groove to form a backing seam, and includes a skin of a predetermined pattern on which real stitches are formed along the stitch line groove: The real stitches are formed only with the upper thread without the lower thread (previous claim 5) ) The elastic resin in the above-mentioned stitch line groove acts as a lower thread to hold the upper thread, so there is no risk of the sewing thread made with only the upper thread being broken when sewing skin, the sewing thread loosening after sewing, or misalignment of the real stitch line on a real stitch wooden model. This can be achieved smoothly.

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In addition, the above-described stitch line groove, which extends continuously and long, may be formed in a line shape formed in a one-dimensional straight line or a two-dimensional or three-dimensional curved shape, a prayer bead shape, a centipede shape, an arrow shape, or various other shapes.

The elastic resin located in the above stitch line groove may be thermoplastic polyurethane (TPU), thermoplastic polyolefin (TPO), ethylene vinyl acetate (EVA) copolymer, or polyvinyl chloride (PVC), and the elastic resin The upper part may be formed as a concave portion.

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The mating bar inserted into the abutment insertion groove described above may be formed by sewing, or may be formed by forcibly press-fitting without sewing.

Meanwhile, the fourth object of the present invention described above includes a real stitch wooden model manufacturing step of manufacturing a real stitch wooden model according to claim 1, which involves bonding a skin of a predetermined pattern to a wooden model base and sewing real stitches; A replication step of applying silicone to the real stitch wooden mold to produce a silicon model replicated in the first negative state, and then applying epoxy resin to the silicon model to create an epoxy model in the same positive state as the real stitch wooden model. and; A method of manufacturing an electroform mold using a real stitch wooden mold, which includes the electroform mold manufacturing step of forming a conductive silver film on the surface of the replicated epoxy model, electroforming nickel to form a nickel shell, and then removing the epoxy model. This can be achieved smoothly.

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In addition, with the skin of a predetermined pattern attached to the wooden mold base, sewing thread insertion points can be marked in advance at predetermined intervals along the stitch line groove using a CNC machine, and the sewing thread can be inserted into the sewing thread insertion points using a needle.

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As described above, the real stitch wooden model according to the present invention places elastic resin in the continuously extending stitch line groove of the wooden model base, thereby attaching a skin with a predetermined pattern to the surface of the wooden model base and then attaching it along the stitch line groove. When forming a real stitch, the elastic resin in the stitch line groove acts as the lower thread of the sewing thread and prevents the upper thread from coming off, so the tension of the sewn thread is maintained constant, preventing the thread from breaking or breaking after sewing. There is no risk of unraveling or poor sewing, there is no need to specifically control the diameter of the needle or the thickness and material of the sewing thread, there is no risk of misalignment of the real stitch line, and the ease of production and economic efficiency are high. The Jeonju mold produced is effective in manufacturing automobile interior materials with elaborate and realistic fake stitches.

Figure 1 is a schematic perspective view showing the structure of a real stitch wooden mold according to the present invention.
Figure 2 is a cross-sectional view of Figure 1.
Figure 3 is a schematic perspective view of a wooden mold base.
Figure 4 is a cross-sectional view of Figure 3.
Figure 5 is a schematic perspective view of a state in which a skin is bonded to the surface of a wooden mold base.
Figure 6 is a schematic perspective view showing a state in which sewing thread insertion points are marked on the skin after the skin is joined to the wooden mold base.

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

Figure 1 is a schematic perspective view showing the structure of the real stitch wooden model 1 according to the present invention, Figure 2 is a cross-sectional view of Figure 1, Figure 3 is a schematic perspective view of the wooden mold base 2, and Figure 4 is a cross-sectional view of Figure 3. , Figure 5 is a schematic perspective view of the skin 3 bonded to the surface of the wooden mold base 2, and Figure 6 shows the sewing thread insertion point ( This is a schematic perspective view showing the state in which 2b) is displayed, and will be mentioned together for convenience of explanation.

In the present invention, the wooden mold base 2 is formed with a counter seam insertion groove 2b and a stitch line groove 2a extending continuously and long at a predetermined distance on one or both sides of the counter seam insertion groove 2b. , the elastic resin (4) is located within the above-described stitch line groove (2a).

The above-described stitch line groove 2a has a width in the range of 0.5 to 5 mm and a depth of 2 to 50 mm, taking into account various parameters such as the type and thickness of the sewing thread, the desired shape or size of the stitch, the number of stitches, and the width equivalence between stitches. It is formed in the range of

In addition, the above-mentioned stitch line groove 2a is continuous in a line shape formed in a one-dimensional straight line, two-dimensional or three-dimensional curved shape, a prayer bead shape, a centipede shape, an arrow shape, a mixture of these shapes, or various other predetermined shapes. It is formed as a long extension.

In this way, the stitch line groove 2a, which is formed to continuously extend long, is easier, simpler, and faster to process than when forming multiple independent grooves or holes intermittently spaced a predetermined distance apart with a groove forming needle or drill. There is an advantage to being able to do it.

Meanwhile, the elastic resin 4 located in the above-mentioned stitch line groove 2a is not limited to this, but is thermoplastic polyurethane (TPU), thermoplastic polyolefin (TPO), ethylene vinyl acetate (EVA) copolymer, or polyvinyl. It may be chloride (PVC).

The above-mentioned elastic resin 4 can be pre-molded and inserted by forceful press-fitting, but can be formed efficiently and simply by filling the elastic resin monomer or oligomer into the pre-formed stitch line groove 2a and then curing it. There is a number.

The elastic resin (4) filled in the stitch line groove (2a) where the sewing thread is inserted is an elastic resin ( Since 4) faithfully performs the role of the lower thread that elastically holds the upper thread taut, the sewing thread's stitch quality can be improved by maintaining constant alignment and tension of the upper thread when sewing the skin (3), and it can prevent the sewing thread from loosening or the needle from loosening. There is no risk of sewing defects.

The skin 3 described above is made of natural leather, artificial synthetic leather made of thermoplastic polyurethane (TPU), thermoplastic polyolefin (TPO), or polyvinyl chloride (PVC), or fabric with a predetermined pattern. Limited examples include: However, one with a thickness of about 0.6mm can be used.

The skin 3, on which a predetermined embossing pattern is formed, is applied with a two-component bond to its bottom and the outer surface of the wooden mold base 2, and is N pinged (joined) to wrap it to fit the shape of the outer surface of the wooden mold base 2. )do.

At this time, the matching bar portion (3a) formed by inserting the skin (3) into the matching bar insertion groove (2b) of the wooden mold base (2) is formed by inserting and attaching two skins (3) by sewing them together (see Figure 2). ) Or, it is formed by forcing and pushing it into a double-pole shape using a thin spatula made of plastic, wood, or metal without sewing.

In this way, after joining the skin 3 of a predetermined pattern to the wooden mold base 2 with the back seam portion 3a formed, as shown in FIG. 6, the exact stitch position in not only the two-dimensional but also the three-dimensional shape, Using a CNC processing machine that can most accurately express the number and alignment of the sewing thread, sewing thread insertion points ( After marking 3b) in advance, the sewing thread penetrates the skin 3 with a needle along the sewing thread insertion points 3b and is embedded in the elastic resin 4. Even if the needle comes out to form the next stitch, the embedded sewing thread remains. Since the elastic resin (4) holds the sewing thread securely, there is no risk of the sewing thread breaking, and it is possible to form a uniform real stitch (5) of excellent quality.

Meanwhile, the upper part of the elastic resin 4 is formed with a concave portion (reference not given; see FIG. 4) so that the sewn real stitch 5 is seated within the concave portion, so that the real stitch line is accurate and Make it neat and realistic.

The manufacturing method of an electromagnetic mold using a real stitch wooden mold according to the present invention includes the following steps.

(1) Real stitch wooden model production steps:

After forming the counter seam insertion groove 2b and the stitch line groove 2a as described above extending continuously and long at a predetermined distance on one or both sides of the counter seam insertion groove 2b on the wooden mold base, the stitch line groove 2a described above is formed. The elastic resin 4 is placed in the line groove 2a (see FIGS. 3 and 4).

The above-described elastic resin 4 is formed by injecting into the stitch line groove 2a and then curing, and the upper part of the above-described elastic resin 4 is formed as a concave portion so that the real stitch 5, which is sewn, is seated within the concave portion. As mentioned above, it can be done as much as possible.

The skin 3 of a predetermined pattern is inserted into the back seam insertion groove 2b and joined to form the back seam portion 3a (see FIG. 5), and then the stitch line groove 2b and the elastic resin 4 are formed using a CNC processing machine. By marking in advance the sewing thread insertion points 3b at predetermined intervals (see FIG. 6) and sewing the sewing thread with a needle along the above-mentioned sewing thread insertion points 3b, beautifully aligned real stitches 5 are formed. Produce a real stitch wooden model (1).

(2) Replication step:

After applying silicone to the above-mentioned real stitch wooden model (1) to produce a silicone model replicated in the first negative state, epoxy resin is applied to the above-described silicone model to create a silicone model in the same positive state as the above-mentioned real stitch wooden model (1). Create an epoxy model.

(3) Jeonju mold production steps:

The surface of the replicated epoxy model was coated with a thin silver film by a silver reaction to enable electricity to pass through, then the epoxy model coated with the silver film was immersed in a nickel sulfamate bath, and direct current electricity of 0.6~3A was supplied to achieve a nickel plating thickness of 4. Electrospray the nickel until it reaches ~5mm.

Using a silver film-coated epoxy model, a nickel shell with a predetermined texture and pattern and real stitches negatively electroformed is placed in a furnace and heated to 300-400°C to remove the epoxy model, thereby separating the manufactured nickel shell electroform mold. .

The electromagnetic mold produced in this way is connected to a mold box, the lower mold is manufactured, and the upper and lower molds are assembled into a vacuum mold that is combined to injection mold the automobile interior material.

Although the present invention has been described in detail so far, this is only for illustrating the present invention and is not intended to limit the present invention, and of course, those skilled in the art can make various changes and modifications without departing from the scope of the present invention. It is within the area of .

1: Real stitch wooden model according to the present invention
2: Wooden mold base
2a: Stitch line groove 2b: Back seam insertion groove
3: skin
3a: Mating seam 3b: Sewing thread insertion point
4: Elastic resin 5: Real stitch

Claims (10)

A wooden base having a backing insertion groove and a continuously extending stitch line groove having a width of 0.5 to 5 mm and a depth of 2 to 50 mm;
an elastic resin located in the stitch line groove of the wooden mold base and formed by filling an elastic resin monomer or oligomer and then curing it;
It is attached to the surface of the wooden mold base and is inserted into the abutment insertion groove to form an abutment portion, and includes a skin of a predetermined pattern with real stitches formed along the stitch line groove:
The above-mentioned real stitch is formed with only the upper thread without the lower thread, and the elastic resin in the above-mentioned stitch line groove plays the role of the lower thread to hold the upper thread, thereby preventing the breaking of the sewing thread made of only the upper thread during skin sewing, the loosening of the sewing thread after sewing, or the real stitch line. No risk of misalignment
Real stitch wooden mold. delete The real stitch wooden model according to claim 1, wherein the stitch line grooves extending continuously and long are formed in a line shape, a prayer bead shape, a centipede shape, or an arrow shape, which is formed in a one-dimensional straight line or a two-dimensional or three-dimensional curved shape. . The method of claim 1, wherein the elastic resin located in the stitch line groove is thermoplastic polyurethane (TPU), thermoplastic polyolefin (TPO), ethylene vinyl acetate copolymer, or polyvinyl chloride (PVC), and the elastic resin is A real stitch wooden model with a concave upper part. delete The real stitch wooden mold according to claim 1, wherein the upper stitch portion inserted into the upper stitch insertion groove is formed by sewing or is formed by forcibly press-fitting without sewing. A real stitch wooden model manufacturing step of manufacturing a real stitch wooden model according to claim 1, which involves bonding a skin of a predetermined pattern to a wooden model base and sewing real stitches;
A replication step of applying silicone to the real stitch wooden mold to produce a silicon model replicated in the first negative state, and then applying epoxy resin to the silicon model to create an epoxy model in the same positive state as the real stitch wooden model. and;
It includes the electroforming mold manufacturing step of forming a conductive silver film on the surface of the replicated epoxy model, electroforming nickel to form a nickel shell, and then removing the epoxy model.
Manufacturing method of a Jeonju mold using a real stitch wooden mold. delete According to claim 7, when the skin of a predetermined pattern is joined to the wooden mold base, sewing thread insertion points are marked in advance at predetermined intervals along the stitch line groove using a CNC processing machine, and the sewing thread is inserted into the sewing thread insertion point using a needle. A method of manufacturing a Jeonju mold using a real stitch wooden mold. delete