TWI415730B - The system of masking - Google Patents

Abstract

A manufacturing method of mask is disclosed, which is to form a sculpture layer on a substrate first, then carve the required pattern outline on the sculpture layer. Then the method includes forming the main mask body on the sculpture layer, and taking out the main mask body, reinforce the main mask body properly, and excavating the pattern portion of main mask body, thereby completing the manufacturing of mask. Because it is totally not necessary to use hi-tech equipment and system, so the manufacturing cost of mask is greatly decreased.

Description

Masking method

The invention relates to a method for manufacturing a mask, in particular to a method for reducing a mask of manufacturing cost.

At present, the local plating of the currency stamp is formed by metal plating on the partial surface of the currency stamp, and the method of partial plating is various, such as the paint masking method, the gravure printing transfer (PAD) method, the anti-plating tape sticker masking method or the masking. The cover method, etc., can be selected according to the nature of the product to be electroplated; the use of anti-painting, anti-plating tape or anti-plating stickers has the problem of poor precision, for example, some cannot be applied to the surface with 3D stereoscopic pattern; The PAD method is to coat the ink on the patterned steel plate, and then scrape the flat ink with a blade, then use the transfer adhesive to pick up the remaining ink to be printed on the currency stamp, and then remove the ink after electroplating. It is easy to contaminate the currency stamp and it is easy to scratch the coin.

For the soft and delicate coin stamping partial plating, it is most suitable for the mask plating method, which is not only highly precise, but also has the least damage to the currency stamp.

Please refer to Figures 1A to 1C for the method of electroplating metal on the chapter of the currency. As shown in FIG. 1A, a coin 1 having a pattern K on the top surface is provided; as shown in FIG. 1B, a mask 9 is formed on the medal 1, and the mask 9 has a hollow corresponding to the pattern K. A region 90; as shown in FIG. 1C, a gold (Au) layer 8 is electroplated on the pattern K in the hollow region 90, and the mask 9 is removed.

The Chapter 1 is a high-quality silver material that is combined with a refined mold and produced by printing. Therefore, the surface of the product is a flat mirror surface, which is easily stained or scratched by touch. Therefore, in the conventional mask plating method, since the mask 9 needs to be covered on the surface of the coin 1 for partial plating, in order to avoid damage on the surface of the coin 1, the mask is formed. The material of 9 needs to have many considerations. For example, the mask 9 needs to be resistant to acid and alkali to contact the plating solution, not to damage the surface of the coin 1 (such as scratches or stains), and has elasticity to closely fit the coin 1 The surface needs to be transparent to visually locate. Based on the material consideration for the mask 9, the industry currently uses ruthenium rubber as the material of the mask 9, and the ruthenium rubber is made into the mask 9 by Reverse Engineering (RE).

The reverse engineering method is defined as: measuring the point data of the surface of the actual object by the reverse scanning device, and then re-introducing into the special software for the reverse engineering to construct the process of forming the image data.

The method of making the mask 9 by using the reverse engineering method is to first scan the coin chapter with a scientific instrument to create a 3D image file, and then convert it into an electronic file according to the demand range by computer actuation, and then produce an electrode, and then produce a production mask by precision electric discharge machining. The mold of the cover.

In detail, the system first scans the point data: using a CCD Camera and a grating projection device, the grating is projected onto the surface of the coin, and the thickness is changed and displaced, and the captured digital image is matched with the CCD Camera. Through computer computing, you can know the 3D appearance and point data of the currency stamp.

Then, the processing of the point data is performed: after the 3D scanning is completed, the triangular mesh operation is used to eliminate the repeated data of the scanning, and the optimization operation is performed according to the curvature of the appearance of the workpiece. After that, the construction of the curved mold is carried out: according to the 3D coordinates generated by the area, contour and curved surface to be electroplated, and the outer frame part is constructed, the data is transferred into the CAD/CAM system, and then converted into an NC processing path to produce an electric discharge processed pure copper electrode. . Finally, a mask mold is formed by a precision electric discharge machining mechanism, and the mold is integrally formed by a hot press molding machine.

However, it is customary to use the reverse engineering method to make the mask 9. It is necessary to use a variety of high-tech equipment and systems, such as CCD Camera, grating projection equipment, precision electric discharge machine, CAD/CAM system, etc., because of the price of these equipments. It is expensive and difficult to obtain, so the manufacturing cost of the mask 9 is greatly increased.

Therefore, how to avoid the lack of high cost of masking by conventional techniques has become a problem that is currently being solved.

In view of the above-described deficiencies of the prior art, the present invention provides a mask that is highly accurate and can be fabricated without expensive equipment.

Generally speaking, the sculptural layer is formed directly on the base of the coin, and the desired outline of the pattern is engraved on the sculptural layer; then, the mask body is formed on the sculptural layer; finally, the cover is taken out. The cover body is appropriately reinforced to hollow out the pattern on the mask body to form a mask having a cutout corresponding to the pattern, so that the mask can be used to form an attachment material on any workpiece.

It can be seen from the above that the mask method of the present invention directly forms the mask body on the same coin chapter to be electroplated, and does not need to use high-tech equipment and systems, that is, can be manually manufactured, thereby greatly reducing the mask. Production costs.

Furthermore, the coin having a patterned sculptural layer on the surface may be used to form a male mold on the sculpted layer; then, the male mold is taken out, and then the female mold is formed on the male mold; finally, the female mold is taken out, In order to facilitate the subsequent process to use the master mold to make a mask; thus, to replace the original medallion with a patterned sculpture layer.

The other embodiments of the present invention will be readily understood by those skilled in the art from this disclosure.

Please refer to Figures 2A to 2H for the method of manufacturing the mask 2 of the present invention. Wherein, the mask 2 can be used to cover the workpiece to form an adhesive on the exposed surface of the workpiece.

As shown in FIGS. 2A and 2A', a carrier 20 is provided, and a coin 21 is disposed on the carrier 20, and the top surface of the medal 21 has a pattern K; in this embodiment, the coin is Chapter 21 is used as the substrate, but not limited to this.

As shown in Figures 2B and 2B', a sculptural layer 22 is formed on the coin cap 21. The material forming the sculptural layer 22 is a sculptural material having adhesion (such as strong adhesion), for example, wax, clay, etc., to be fixed on the coin 21, which is mainly based on wax, and can be used as a wax drop. Melted on the coin 21 and solidified. Then, since the top surface of the medal 21 has a pattern K, a groove 220 is engraved on the sculptural layer 22 along the outline of the pattern K to expose the surface of the pattern K contour of the medal 21.

The engraved pattern can be not only a pattern but also a graphic. As shown in Fig. 2B", a circular groove 221 is engraved on the sculptural layer 22 on the edge of the coin 21 to form a bead on the subsequent mask to facilitate positioning when the mask is provided. Alternatively, the font on the coin 21 (in the figure "year") or the wax layer on the undulation may be hollowed out to expose the font or the undulation, so when using the mask prepared subsequently, Not only can the alignment be facilitated, but the metal can be formed on the word "year" or on the undulation of another coin.

In other embodiments, the user can engrave any graphic (eg, circular, polygonal, irregular, etc.) or pattern on the sculptural layer 22.

As shown in FIG. 2C and FIG. 2C, the carrier 20 is placed on a pedestal 23 having a through opening 230 at the bottom of the pedestal 23, and a positioning post 231 is disposed around the pedestal 23, and the positioning post 231 is disposed. The surface can have threads.

As shown in FIG. 2D, a masking material 24a is formed on the carrier member 20 and the sculpture layer 22 to cover the sculpture layer 22, and the masking material 24a flows into the groove 220. In this embodiment, the masking material 24a is a rubber material, such as a rubber, and when the rubber is blended, a vacuum process is required to extract the air in the rubber, thereby avoiding the internal molding of the rubber. Air bubbles are generated and become defective.

In addition, bismuth rubber is a chemically synthesized elastomer, which is similar to the flexibility of rubber. It has the advantages of high and low temperature resistance, acid and alkali resistance, water resistance, etc., which is commonly used in the industry, which has high fluidity and is used for production. A high-density mask that isolates the plating solution if it is used in an electroplating process.

As shown in FIGS. 2E and 2E', a transparent top cover 25 is placed on the base 23 by a molding process to press the mask member 24a so that the mask member 24a fits the carrier member 20 and The sculpture layer 22 forms a mask body 24 having the pattern K' (which is the same as the pattern K of the medal 21).

In this embodiment, the top cover 25 has a flow guiding hole 250 and a positioning hole 251, so that the unnecessary covering material 24a can be led out from the guiding hole 250 when the stamper is pressed, and the top cover 25 is provided by the positioning hole 251. The positioning post 231 of the base 23 is inserted to facilitate the placement of the top cover 25 on the base 23, and the top cover 25 is pressed obliquely to prevent air bubbles from being generated in the mask body 24.

Moreover, after the top cover 25 is pressed against the masking material 24a, it can be locked on the positioning post 231 by screws (not shown) to prevent the top cover 25 from moving up and down, and the mask body can be avoided. The pattern of 24 is K' deformation.

Moreover, if the sculptural layer 22 is a wax material, the masking material 24a cannot be heated and fixed to the mask body 24 by heating, so that a normal-temperature drying method can be used to pass the guiding hole 250. The gas is circulated, so that the masking material 24a is naturally formed into the mask body 24.

As shown in FIGS. 2F, 2G, and 2G', after the top cover 25 is removed, the mask body 24 can be pushed out by the opening 230 of the base 23, but since the mask body 24 is made of a rubber material, The structure is flexible and easily damaged; therefore, the reinforcing structure 26 can be first disposed on the mask body 24, and the mask body 24 and the reinforcing structure are taken out from the bearing member 20 and the sculpture layer 22 together. 26.

The reinforcing structure 26 may include: a plate body 260 corresponding to the bottom of the shielding body 24, and a frame body 261 disposed on the plate body 260 for facilitating access to the mask body 24 by the frame body 261. . In the embodiment, the plate body 260 is a transparent acrylic plate to reduce the flexibility of the mask body 24, and the transparency thereof can be used as the position and positioning point of the proof mask to avoid the accuracy. Poor plating position. The frame 261 is a radial acryl strip, which not only enhances the strength of the mask body 24, but also has a clamping portion 261a. If used in the mask plating method, the clamping portion 261a can be used for clamping. Cover, which is good for plating.

Furthermore, before forming the masking material 24a (ie, in the process of FIG. 2C), a release profile (not shown) may be formed on the sculpture layer 22, for example, by spraying a release agent to facilitate separation of the sculpture. The layer 22 and the mask body 24 are such that when the mask body 24 is taken out, the surface of the mask body 24 is not damaged, that is, the mask material 24a is not left on the sculpture layer 22.

Moreover, due to the groove 220 of the sculptural layer 22, the pattern outline L on the mask body 24 will form a height difference from the surface of the mask body 24, as shown in Fig. 2G'.

Further, since the mask body 24 is made of a rubber material and is easily released from other materials, the plate body 260 (acrylic plate) is adhered to the mask body 24 by gluing.

As shown in Figures 2H and 2H', part of the mask body 24b is removed, i.e., the mask body 24 corresponds to a portion of the pattern outline L to form a mask having a hollowed out area 240 (corresponding to the pattern K of the medal 21). Cover 2. Moreover, since the plate body 260 corresponds to the bottom of the body 24, a part of the plate body 26a corresponding to the pattern K' of the partial mask body 24b needs to be removed.

In this embodiment, since the plate body 260 is an acrylic plate, and the mask body 24 is made of a rubber material, it is not suitable to use a chemical method such as cauterization, etching, or laser to remove the process, and the tool can be cut by a cutter. The removal process is performed in a physical manner such as drilling, engraving, or the like to avoid damage to the mask body 24.

The invention makes the mask body 24 directly on the base body (coin chapter 21), and does not need to use high-tech equipment and systems at all, so the manufacturing cost of the mask 2 is effectively reduced.

In the above method of the present invention, although the substrate having the sculptural layer 22 can be reused, the material of the wax is fragile and easily damaged, so that it is difficult to store, and the sculpted layer 22 is difficult to use for a long time; The heat will melt, so the thermosetting method cannot be selected to shorten the molding time of the mask 2. Therefore, the present invention has been developed to produce a mold which is not melted by heat, and the molding time can be shortened by means of thermosetting. Of course, it is also possible to select a material that is not melted by heat and is easier to store as the sculptural layer 22, and it is not necessary to additionally produce a heat-resistant and durable mold.

Referring to Figures 3A through 3D, a method of making a permanent mold using a base having a sculptural layer 22, such as the coin 21 shown in Figures 2B and 2B'.

As shown in FIG. 3A, the structure as shown in FIG. 2B is disposed in a container 34, and a liquid substance such as gypsum slurry is placed in the container 34, and after the gypsum slurry is solidified, a model 30 is formed on the carrier. The member 20, the coin cap 21 and the sculptural layer 22, and the model 30 has a convex portion 300 corresponding to the groove 220.

In the present embodiment, when the gypsum slurry is prepared, if the gypsum density is smaller, the strength of the gypsum after curing is weaker and the water absorption rate is larger, and conversely, the stronger the strength, the smaller the water absorption rate. Therefore, the model 30 needs to have a certain value. The strength is to prevent the convex portion 300 from being broken. Furthermore, when the gypsum slurry is prepared, it is necessary to cooperate with a vacuum process to extract the air in the gypsum slurry, thereby avoiding bubbles in the formation of the gypsum and becoming a defective product.

As shown in Fig. 3B, the container 34 is removed and the mold 30 is removed; the mold 30 is then baked in an oven and processed for surface microfinishing.

In this embodiment, before the gypsum slurry is placed in the container 34, a release agent may be sprayed onto the sculpture layer 22 to facilitate separation of the sculpture layer 22 and the mold 30 so that when the model 30 is taken out, The surface of the mold 30 is destroyed, i.e., no gypsum material remains on the sculpture layer 22.

As shown in FIG. 3C, a mold 31 is formed on the plaster mold 30. In the present embodiment, the process of the mold 31 is first applied to the mold 30 with a release agent, dried by hot air, and the mold 30 is placed in another container 35, and then in the container 35. A plastic liquid (such as a resin) or a molten metal is placed, and after the plastic or metal is cured, a plastic or metal mold 31 is formed on the plaster mold 30.

Furthermore, when modulating the plastic, it is necessary to cooperate with a vacuum process to prevent the plastic mold 31 from having bubbles and becoming a defective product.

As shown in FIGS. 3D and 3D', the mold 31 is taken out from the plaster mold 30, and then subjected to surface micro-finishing to complete the permanent mold 31, and the mold 31 has a concave portion 310 corresponding to the groove 220. The recess 310 forms a pattern S corresponding to the pattern K of the medal 21 . In the subsequent process, the mask 2 can be made by using the mold 31. Please refer to the process of FIGS. 2C-2H, and when curing the mask body 24, the heating method can be selected to increase the mask forming time.

In the present invention, a permanent mold 31, such as a resin mold or a metal mold, is also produced by replicating a wax mold, and since the mold 31 is heat-resistant, a thermosetting method can be selected to increase the mask forming time. Further, since the resin mold 31 or the metal mold is easily stored because it is not easily broken, the mask can be repeatedly used for a long period of time.

By the mask made by the above method, an attachment pattern of different colors or materials can be formed on any workpiece to be processed. The following is a description of the use of the mask in the plating method by means of FIGS. 4A to 4C and FIGS. 5A to 5B, but is not limited thereto.

Please refer to Figures 4A to 4C for the implementation of single-sided partial plating. In the electroplating process, the top surface and the bottom surface of the workpiece (for example, the same coin 41 as the coin chapter 21) are respectively covered with a top mask 2 and a bottom mask 4, and the top mask system is respectively It is the mask 2 shown in FIG. 2H, and the bottom mask 4 can be produced by referring to the methods of FIGS. 2A to 2H and FIG. 4A. Therefore, the method for manufacturing the bottom mask 4 is the same as the method for manufacturing the top mask, and will not be described again.

As shown in FIGS. 4A and 4A', another carrier 40 is provided, and the carrier 40 is placed on the base 23, and a masking material is formed on the carrier 40 and the base 23; The bottom cover 4 is press-formed by the top cover 25 to be pressed to form the bottom cover 4.

As shown in FIG. 4B, a reinforcing structure 26' having a plate body 260' and a frame body 261 is glued to the mask 4; and a wire 47 is disposed on the mask 4, and the wire 47 passes through the mask 4. The plate body 260' is exposed to the upper surface of the mask 4. Moreover, since the bottom surface of the coin cap 41 does not need to be plated with metal, the bottom mask 4 and the plate body 260' of the reinforcing structure 26' need not be hollowed out.

Then, the top surface and the bottom surface of the medal 41 are respectively covered with the mask 2 having the hollow area 240 (such as the pattern K' shown in FIG. 2H) and the bottom mask 4, and the electric wire 47 touches the The bottom of the coin chapter 41. Furthermore, the clamping portion 261a allows the plating device to clamp the mask 2 and the bottom mask 4 up and down to prevent the plating solution from penetrating into the non-plating area, thereby improving the precision of plating.

As shown in FIG. 4C, an electroplating process is performed, and the wire is connected to the electrode by the wire 47 on the bottom mask 4, so that the coin cap 41 is electrified for electroplating, so as to face the surface of the coin 41 in the hollow region 240 of the mask 2. The metal material is formed on the surface, that is, the production of the single-sided electroplated coin is completed.

Please refer to FIG. 5A to FIG. 5B, which are embodiments of double-sided partial plating, that is, a top mask and a bottom mask 5 are respectively disposed on the top surface and the bottom surface of another coin 51, and the top mask is the first The mask 2 shown in Fig. 2H differs from the top mask only in the pattern of the cutout area.

As shown in FIG. 5A, the top surface and the bottom surface of the medal 51 are respectively covered with the mask 2 having the hollowed out area 240 and the bottom mask 5 having the hollowed out area 540 (in the shape of another pattern X), and The wire 57 touches the bottom surface of the medal 51.

As shown in FIG. 5B, the electrode is connected to the top surface and the bottom surface of the currency stamps 240, 540 in the hollow region 240, 540, and the coin 51 is electrified for electroplating, at the top of the coin 51. The metal material is formed simultaneously on the surface and the bottom surface, that is, the double-sided electroplated coin is completed.

In summary, the method for manufacturing the mask provided by the present invention does not require the use of high-tech equipment and systems at all, so that the manufacturing cost of the mask can be greatly reduced.

The above embodiments are intended to illustrate the principles of the invention and its effects, and are not intended to limit the invention. Any of the above-described embodiments may be modified by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the appended claims.

1, 21, 41, 51. . . Coin chapter

2, 4, 5, 9. . . Mask

20, 40. . . Carrier

twenty two. . . Sculpture layer

220. . . Trench

221. . . Ring groove

twenty three. . . Pedestal

230. . . Opening

231. . . Positioning column

twenty four. . . Mask body

240, 540, 90. . . Hollow area

24a. . . Cover material

24b. . . Partial mask body

25. . . Top cover

250. . . Diversion hole

251. . . Positioning hole

26, 26'. . . Reinforced structure

26a. . . Partial plate

260, 260'. . . Plate body

261. . . Frame

261a. . . Clip

30. . . model

300. . . Convex

31. . . Mold

310. . . Concave

34, 35. . . container

47, 57. . . wire

8. . . Gold layer

L. . . profile

K, K', X. . . pattern

S. . . pattern

1A to 1C are schematic cross-sectional views showing a conventional method of plating metal on a silver coin;

2A to 2H are a cross-sectional view and a perspective view showing a method of manufacturing the mask of the present invention; wherein, the 2A' is a perspective exploded view of FIG. 2A, and the 2B' is a perspective view of FIG. 2B, 2B. "The figure is another embodiment of the 2B' diagram, the 2C' diagram is the perspective exploded view of the 2Cth diagram, and the 2E' diagram is the cross-sectional exploded view of the 2E diagram, and the 2G' diagram is The exploded view of Fig. 2G, the 2H' is a perspective exploded view of Fig. 2H;

3A to 3D are schematic cross-sectional views showing a method of manufacturing a permanent mold produced by the method of the mask of the present invention; wherein the 3D' diagram is a perspective view of the 3D diagram;

4A to 4C are schematic cross-sectional views showing single-sided partial plating using the mask of the present invention; wherein, FIG. 4A' is a cross-sectional exploded view of FIG. 4A;

5A to 5B are schematic cross-sectional views showing the double-sided partial plating using the mask of the present invention.

20. . . Carrier

twenty two. . . Sculpture layer

220. . . Trench

twenty three. . . Pedestal

230. . . Opening

twenty four. . . Mask body

26. . . Reinforced structure

260. . . Plate body

261. . . Frame

261a. . . Clip

Claims (19)

A masking method for laying on a workpiece to form an attachment material on a surface of the workpiece that is not covered with the mask, the method comprising: providing a substrate; forming a sculpture layer Forming a pattern on the sculpture layer; forming a masking material on the sculpture layer to form a mask body having the pattern; removing the mask body; and removing the mask body corresponding to the pattern Part to form the mask, and the mask has a hollowed out area corresponding to the pattern. The method of fabricating a mask according to claim 1, wherein the base system is the same as the workpiece. The method for manufacturing a mask according to claim 1, wherein the base system is a currency stamp. The method of fabricating a mask according to claim 1, wherein the substrate has another identical pattern corresponding to the pattern, such that the contour of the pattern engraved on the sculpture layer exposes another identical pattern contour of the substrate. . The method of fabricating a mask according to claim 1, wherein the material forming the sculptural layer has adhesion to be fixed to the substrate. The method of fabricating a mask according to claim 1, wherein the material forming the sculptural layer is wax or clay. The method of fabricating a mask according to claim 1, wherein the masking material is a rubber material. The method of fabricating a mask according to claim 1, wherein the masking material is a ruthenium rubber. The method of fabricating a mask according to claim 1, wherein a contour of the pattern on the mask body and a surface of the mask body have a height difference to facilitate formation of the hollow region. The method of fabricating a mask according to claim 1, wherein before the forming of the sculpture layer, a carrier is provided to provide the substrate on the carrier. The method of fabricating a mask according to claim 1, wherein the substrate is placed on the pedestal before forming the mask. The method for manufacturing a mask according to claim 1, wherein before the forming of the masking material, a release profile is formed on the sculpture layer to facilitate removal of the mask body. The method of fabricating a mask according to claim 1, further comprising pressing the cover material by a stamping process to form a mask body having the pattern. The method for manufacturing a mask according to claim 1, wherein after the mask body is formed, a reinforcing structure is first disposed on the mask body, and then the mask body is taken out. The method of fabricating a mask according to claim 1, further comprising providing an electric wire on the mask. The method for manufacturing a mask according to claim 1, further comprising forming a model on the coin and the sculpture layer; taking out the mold; forming a mold on the mold; and taking out the mold to make the mold surface With this pattern. The method of fabricating a mask according to claim 16, further comprising: forming another masking material on the surface of the mold to form another mask body having the pattern; and removing the other mask body And removing a portion of the outline of the pattern on the other mask body to form another mask having the hollowed out area of the pattern. The method of fabricating a mask according to claim 16, wherein the material forming the model is gypsum. The method of fabricating a mask according to claim 16, wherein the material forming the mold is resin, plastic or metal.