JP3847243B2 - Mold for molding rubber bracelet and method for molding rubber bracelet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a molding die for a rubber bracelet that fits on an arm, for example, as an ornament and a molding method for a rubber bracelet.
[0002]
[Prior art]
In recent years, as a bracelet 1 to be fitted to an arm, for example, as shown in FIG. 6, a shape molded from silicon rubber into a ring shape has been popular because it is easily stretchable and easy to pass through and pull out. ing.
[0003]
FIG. 7 is a cross-sectional view (cross-sectional view taken along IIV-IIV in FIG. 6) that crosses the ring portion 1a. FIG. Is circular as shown in FIG. There are various cross-sectional shapes.
[0004]
As shown in FIG. 8, the bracelet 1 includes a lower mold 5 having a ring-shaped forming groove 3 having a semicircular cross section corresponding to the lower half cross sectional shape of the bracelet 1 in an annular shape, and an upper half of the bracelet 1. A plate-shaped rubber material 11 made of silicon rubber is covered with the upper die 9 having an annular mold groove 7 corresponding to the cross-sectional shape aligned with the molding groove 3 as shown in FIG. The upper mold 9 is placed in a heated atmosphere so that the molding groove 7 is aligned with the molding groove 3, and the upper and lower molds 9, 5 are placed so as to compress the rubber material 11. Manufactured by pressing and molding.
[0005]
8 and 9, reference numeral 13 is a small relief groove having a semi-sectional shape continuously formed outside the molding groove 3 of the lower mold 5, and reference numeral 15 is also continuously formed outside the molding groove 7 of the upper mold 9. The reference numeral 17 is a flat shallow recess formed continuously inside the molding groove 3 of the lower mold 5, and the reference numeral 19 is also inside the molding groove 7 of the upper mold 9. It is a flat shallow recess formed continuously.
[0006]
Each boundary between the molding groove 3 and the relief grooves 13 and the recesses 17 on both sides in the lower mold 5 and each boundary between the molding groove 7 and the relief grooves 15 and the depressions 19 on both sides in the upper mold 9 are shown in FIG. As shown in FIG. 2, the line S and T are pointed, and when the upper and lower molds 9 and 5 are stacked, the lines S and T can come into contact with each other.
[0007]
Therefore, when the rubber material 11 is placed between the upper and lower molds 9 and 5 and the upper and lower molds 9 and 5 are heated and pressurized, the rubber material 11 is deformed and fills the molding grooves 3 and 7, and the escape groove 13. , 15 and the recesses 17 and 19 are filled with the remaining rubber material 11.
[0008]
After that, if the upper and lower molds 9 and 5 are separated and the molded rubber material 11 is taken out, the ring-shaped bracelet 1 is very easily separated from the portions filled with the escape grooves 13 and 15 and the recesses 17 and 19 and molded. Is completed.
[0009]
Then, characters and figures are printed on the surface of the bracelet 1 to complete the product.
[0010]
[Problems to be solved by the invention]
However, when the rubber material 11 is placed between the two upper and lower molds 9 and 5 as described above, the filaments S and T come into contact with each other when the upper and lower molds 9 and 5 are stacked. Even if the bracelet 1 is molded so as to be punched from the upper and lower molds 9 and 5, the portions corresponding to the filaments S and T are formed on the outer surface and inner surface of the bracelet 1 as shown in FIG. For example, a small annular ridge 21 remains.
[0011]
Therefore, as shown in FIG. 6, when the character string 23 is printed on the outer surface of the bracelet 1, the ridges 21 are obstructed and a beautiful printing form cannot be obtained, and even if printing is performed, the printing material is peeled off. It is easy and looks bad.
[0012]
If it is to be printed clearly, it must be printed on the upper or lower end face side of the bracelet 1 like the character string 23a, the print area is small and the character string 23a has to be reduced, Even when it is fitted, the character string 23a is difficult to see and still has a bad appearance.
[0013]
The present invention has been made to solve such a problem, and it is easy to print a character string or a pattern on the outer surface of a rubber bracelet, and the printed state is good, and a bracelet that is attractive and fashionable is obtained. molding die rubber bracelet and an object to provide a method of molding a rubber bracelet.
The purpose is to provide.
[0014]
[Means for Solving the Problems]
In order to solve such a problem, the present invention is a first mold having a penetrating portion, on a cylindrical inner wall that forms the penetrating portion, on a ring-shaped bracelet cross section on the outer circumferential side in a cross section. A first mold provided with a corresponding first molding groove in an annular shape, and a second mold inserted into the first mold from one of its penetrating parts, the remaining inner circumference of the bracelet A second mold in which a second molding groove corresponding to the one side partial section in the half section is provided in an annular shape, and the first mold so as to approach the second mold from the other of the penetrating portions. A third mold that is inserted into the third portion, corresponds to the other side partial cross section of the inner circumferential half cross section of the restlet, and forms a ring portion shape of the bracelet together with the first and second molding grooves. And a third mold provided with a molding groove in an annular shape.
[0015]
The molding method according to the present invention is a first mold having a penetrating portion, which corresponds to an outer peripheral side half cross section of the ring bracelet cross section on the cylindrical inner wall forming the penetrating portion. 1st metal mold | die which provided 1 shaping | molding groove | channel annularly, and the 2nd metal mold | die inserted into this 1st mold from one side of the penetration part, Comprising: The remaining inner-periphery half section of the bracelet And a second mold having a second molding groove corresponding to a partial cross section on one side in an annular shape, and the first mold inserted into the first mold so as to be close to the second mold from the other through portion. A third mold groove that corresponds to the other partial cross section of the bracelet on the inner circumferential side of the bracelet and that forms the ring portion shape of the bracelet together with the first and second mold grooves. A third mold provided in an annular shape is prepared, and the first mold has a through-hole. From the side, the second mold is fitted so that the first and second molding grooves are aligned, and a rubber material is disposed at least in the vicinity of the first and second molding grooves. The third mold is fitted to the through part of the mold from the other side so that the third molding groove is fitted to the first and second molding grooves, and the first to third molds are placed in a heated atmosphere. The bracelet is formed by placing and pressing the second and third molds so as to narrow each other.
[0016]
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
1 and 2 are a sectional view and an exploded sectional view showing an embodiment of a molding die for a rubber bracelet according to the present invention. Incidentally, For a method of molding a rubber bracelet according to the present invention will be described in the course of explaining the use of the molding die.
[0019]
1 and 2, the molding die of the present invention is schematically represented by a first die (middle die) 25 made of, for example, a steel material or other heat-resistant hard material, and a second die (lower die). A mold) 27 and a third mold (upper mold) 29.
[0020]
The first mold 25 has a through portion 31 having an inner diameter dimension substantially corresponding to the diameter dimension between the centers of the ring portions 1a of the bracelet 1 to be molded (see FIGS. 6 and 7 described above). It is formed thin with a thickness V that is approximately twice or more the thickness dimension of the portion 1a.
[0021]
In the cylindrical inner wall 33 that forms the penetrating portion 31, the first mold 25 has a transverse cross section that intersects the ring portion 1 a of the bracelet 1 and a semicircular half cross section on the outer peripheral side in the thickness direction. A corresponding first molding groove 35 is formed in an annular shape.
[0022]
As shown in FIG. 2, relief grooves 37a and 37b having a semicircular cross section are formed annularly on the inner wall 33 on both the upper and lower sides of the first molding groove 35 in the thickness direction of the first mold 25. Is formed.
[0023]
The second mold 27 is integrally formed with a projecting portion 39 that is inserted into the first mold 25 from the lower side in the drawing into the penetration portion 31 and has a length approximately half (1/2) of the penetration portion 31. And a second forming groove corresponding to a further half partial cross section (a whole 1/4 cross section) of the remaining inner peripheral half cross section of the bracelet 1 at the annular corner portion on the outer periphery of the tip of the projecting portion 39. 41 has a ring shape.
[0024]
Also on the projecting portion 39 of the second mold 27, relief grooves 43 a and 43 b are continuously formed in an annular shape so as to align with the relief groove 37 a, with the second molding groove 41 interposed therebetween. Inside the groove 43b, that is, the top portion of the protrusion 39 is a concave portion 45 that is slightly depressed.
[0025]
The third mold 29 is integrally provided with a projecting portion 47 that is inserted into the first mold 25 from the upper side in the drawing into the penetration part 31 and has a length approximately half (1/2) of the penetration part 31. A third forming groove 49 corresponding to the remaining partial cross section (the entire remaining 1/4 cross section) of the inner peripheral half cross section of the bracelet 1 is annularly formed on the outer periphery of the tip of the projecting portion 47. Yes.
[0026]
The projecting portion 47 of the second mold 29 also has relief grooves 51a and 51b formed in an annular shape continuously with the third molding groove 49 so as to align with the relief groove 37b. A recess 53 is formed in which the inside of the groove 51b, that is, the top of the protrusion 47 is slightly depressed.
[0027]
Reference numeral 37 c is a relief groove formed on the contact surface of the first mold 25 with the third mold 29.
[0028]
In the first mold 25, each boundary between the first molding groove 35 and the relief grooves 37a and 37b on both sides, the second molding groove 41 and the relief grooves 43a and 43b on both sides in the second mold 27, Further, each boundary between the third molding groove 49 and the relief grooves 51a, 51b on both sides of the third mold 29 is a sharp line s, t, u. When the 1st-3rd metal mold | dies 25-29 are piled up, the filaments s, t, and u can contact | abut.
[0029]
The outer dimensions of the projecting portions 39 and 47 are substantially the same as or slightly smaller than the inner diameter of the penetrating portion 31 of the first mold 25.
[0030]
Next, although the usage example of the molding die of the bracelet mentioned above is demonstrated, the molding method of the bracelet of this invention is also demonstrated in this process.
[0031]
First, the first mold 25 provided with the first molding groove 35 corresponding to the outer peripheral side half section of the bracelet 1 on the inner wall 33, and the protrusion 39 that fits in the through portion 31 of the first mold 25 are provided. A second mold 27 provided with a second molding groove 41 corresponding to a partial cross section of the bracelet 1 (a quarter cross section of the entire bracelet), and a projecting portion 47 that fits into the through portion 31 of the first mold 25 A third mold 29 provided with a third molding groove 49 corresponding to the remaining partial cross section of the bracelet 1 (the remaining 1/4 cross section of the whole) is prepared.
[0032]
Next, as shown in FIG. 3, the protrusion 39 of the second mold 27 is inserted into the through-hole 31 of the first mold 25 from the lower side (one side), and the first mold 25, the second mold 27 is stacked.
[0033]
In this state, the first molding groove 35 of the first mold 25 and the second molding groove 41 of the second mold 27 are aligned to form 3/4 of the transverse cross section of the ring portion 1a of the bracelet 1. .
[0034]
Further, for example, a plate-like rubber material 55 made of a silicon rubber material is put into the through portion 31 of the first mold 25 from the upper side and is disposed at least in the vicinity of the first molding groove 35.
[0035]
Then, the protrusion 47 of the third mold 29 is inserted into the penetrating part 31 of the first mold 25 from the upper side (the other side), and the third mold 29 is inserted into the first mold 25. The first to third molds 25 to 29 are placed in a heating atmosphere of, for example, about 170 ° C., and the second and third molds 27 and 29 are narrowed to each other, for example, 8 kg / cm _2. For about 7 minutes.
[0036]
In this state, the first to third molding grooves 35 to 49 of the first to third molds 25 to 29 are aligned to form a cross section of the ring portion 1a of the bracelet 1, and the second and third A void is formed between the tip recesses 45 and 53 of the protrusions 39 and 47 of the molds 27 and 29.
[0037]
The rubber material 55 deformed into a gel-like shape during the heating and pressurizing process is filled in the space formed by the first to third molding grooves 35 to 49, and the remaining rubber material 55 that is not filled in the space. Is filled in the space formed between the recesses 45 and 53 of the projecting parts 39 and 47, while formed by the relief grooves 37a and 43a, 37b and 51a of the first to third molds 25 to 29. The rubber material 55 is slightly filled also in the space formed by the space and the escape groove 37c.
[0038]
Then, after removing the third mold 29 from the first mold 25, the molded rubber material 55 is taken out and formed by a space between the projecting portions 39 and 47 and escape grooves 37a and 43a, 37b and 51a. When the rubber material 55 filled in the empty space is removed, the ring-shaped bracelet 1 of the present invention as shown in FIG. 5 is completed.
[0039]
As shown in FIG. 6 described above, the ring-shaped bracelet 1 is commercialized by printing a character string 23 or a pattern on the outer peripheral surface of the ring portion 1a.
[0040]
As described above, the molding die for the rubber bracelet according to the present invention includes the first to third dies 25 to 29, and the first die 25 is provided with the penetrating portion 31 and the penetrating portion 31 is provided. In the inner wall 33 to be formed, a first molding groove 35 corresponding to a half cross section on the outer peripheral side in the cross section of the ring portion 1a of the bracelet 1 is formed in an annular shape, and the second mold 27 has a penetrating portion of the first mold 25. A projecting part 39 to be inserted into the projecting part 31 is provided, and a second forming groove 41 is formed in an annular shape on the outer periphery of the end of the projecting part 39 to form a partial cross section of the remaining half of the remaining inner peripheral part of the bracelet 1. The mold 29 is provided with a protrusion 47 that is inserted into the penetrating part 31 of the first mold 25, and the protrusion corresponding to the remaining partial cross section of the inner peripheral half section of the bracelet 1 is provided on the outer periphery of the tip. 3 forming grooves 49 are formed in an annular shape.
[0041]
Therefore, the rubber material 55 such as silicon rubber is inserted from the upper side into the first mold 25 in a state where the projecting portion 39 of the second mold 27 is inserted into the through part 31 of the first mold 25 from the lower side. Are inserted in the through-hole 31 of the first mold groove 35 and inserted into the through-hole 31 of the first mold 25 from the upper side thereof. When the first to third molds 25 to 29 are heated and pressure-molded in a heating atmosphere so that the second and third molds 27 and 29 are narrowed to each other, as shown in FIG. Small ridges 57 formed along the joints of the third molds 25 to 29 are formed on the inner peripheral surface of the ring portion 1a and the upper and lower end surface side outer peripheral surfaces, and the outer peripheral surface of the bracelet 1 is smooth. It becomes.
[0042]
Therefore, it becomes easy to perform printing on the outer peripheral surface of the ring-shaped bracelet 1, and it becomes difficult for the printed material after printing to be peeled off, and the printing form can be shown larger (see FIG. 6).
[0043]
The rubber bracelet molding die and rubber bracelet which is molded by the molding method of the present invention, for example, print format even when fitted to the arm is easily seen from the outside, appearance is improved, that the rich fashion Become.
[0044]
In the rubber bracelet molding die and molding method described above, it is preferable that the first to third molding dies 25 to 29 are thinly formed because they are small and save material costs. As for No. 25, if it is formed thin with a thickness of about 2 to 4 times, preferably about 2 to 3.5 times the thickness dimension V of the ring portion 1a in the bracelet 1 to be molded, the first molding is achieved even if the number of moldings is increased. There is an advantage that the mold 25 is difficult to sag.
[0045]
The molding die according to the present invention described above is for molding the bracelet 1 having a circular cross section. However, the present invention can be applied to the case of molding the bracelet 1 having an elliptical or rectangular cross section. What is necessary is just to form the cross-sectional shape of the 1st-3rd shaping | molding groove | channels 35-49 of the 1st-3rd shaping die 25-29 according to it, and the 1st-3rd shaping die 25-29. The cross-sectional shapes of the escape grooves 37a to 37c, 43a, 43b, 51a, 51b are also arbitrary.
[0046]
The rubber material for forming the bracelet 1 is generally a silicon rubber material, but is not limited to such a synthetic rubber material, and can be formed from a natural rubber material.
[0047]
Further, the position where the rubber material is arranged in the mold at the time of molding is arbitrary as long as it is at least in the vicinity of the first molding groove 35 of the first molding mold 25, and the shape of the rubber material 55 to be arranged is also arbitrary. is there.
[0048]
Further, the form formed by the joints of the first to third molds 25 to 29 is not limited to the ridge 57 but is a broad line including the ridge 57 and a step.
[0049]
Furthermore, although the above-described molding die according to the present invention has been shown as an example constituted by one each of the first die 25, the second die 27, and the third die 29, the present invention has been shown. If a plurality of first to third molds 25, 27, 29 are formed on one iron plate, a plurality of bracelets 1 can be formed at a time.
[0050]
【The invention's effect】
As described above, the molding die for rubber bracelet according to the present invention can easily form a bracelet that is easy to print on the outer outer surface, such as strings and designs, has good printing condition, is attractive, and is fashionable. It can be processed and the structure of the mold body is simple and easy to manufacture.
Further, the rubber bracelet molding method according to the present invention has an advantage that a character string or the like can be easily printed on the outer surface of the outer side, the printed state and appearance are good, and a fashionable bracelet can be easily obtained.
The rubber bracelet described above has an advantage that it is easy to print a character string or the like on the outer outer surface of the bracelet, has a good print state and appearance, and is rich in fashion.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an embodiment of a molding die for a rubber bracelet according to the present invention.
2 is an exploded cross-sectional view of a molding die for the rubber bracelet shown in FIG. 1. FIG.
FIG. 3 is a cross-sectional view of an essential part for explaining a use example of a molding die for a rubber bracelet according to the present invention and a molding method according to the present invention.
FIG. 4 is a cross-sectional view for explaining a usage example and a molding method of a molding die for a rubber bracelet according to the present invention.
FIG. 5 is a cross-sectional view of a rubber bracelet manufactured by a molding die and a molding method for a rubber bracelet according to the present invention.
FIG. 6 is a perspective view showing a conventional rubber bracelet that is a reference for the present invention.
7 is a cross-sectional view showing a conventional rubber bracelet (cross-section between IIV and IIV in FIG. 6).
FIG. 8 is a cross-sectional view illustrating a molding die for a conventional rubber bracelet.
FIG. 9 is an exploded cross-sectional view for explaining a molding method using a molding die for a conventional rubber bracelet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bracelet 1a Ring part 3 Molding groove 5 Lower metal mold 7 Molding groove 9 Upper metal mold 11 Rubber material 13, 15 Escape groove 17, 19 Recessed part 21, 57 Projection (stitch)
23, 23a Character string 25 First mold 27 Second mold 29 Third mold 31 Penetration part 33 Inner wall 35 First molding grooves 37a, 37b, 37c, 43a, 43b, 51a, 51b Escape groove 39 47 Projection part 41 Second molding groove 45, 53 Recess 49 Third molding groove 55 Rubber material S, T, s, t, u Line V Thickness

Claims (2)

1st metal mold | die which has a penetration part, Comprising: The 1st shaping | molding groove | channel equivalent to the outer peripheral side half section in the cross section which crosses the ring part of a ring-shaped bracelet is cyclically | annularly formed in the cylindrical inner wall which forms the said penetration part A first mold provided;
A second mold that is inserted into the first mold from one of the penetrating portions, and has a second molding groove corresponding to the partial cross section on the one side in the remaining inner circumferential half section of the bracelet. A second mold provided in an annular shape;
A third mold that is inserted into the first mold from the other of the penetrating parts so as to be close to the second mold, and the other side portion of the bracelet on the inner peripheral side half section thereof A third mold having an annular third molding groove corresponding to a cross section and forming the shape of the ring portion of the bracelet together with the first and second molding grooves;
A mold for molding a rubber bracelet, comprising: 1st metal mold | die which has a penetration part, Comprising: The 1st shaping | molding groove | channel equivalent to the outer peripheral side half section in the cross section which crosses the ring part of a ring-shaped bracelet is cyclically | annularly formed in the cylindrical inner wall which forms the said penetration part A first mold provided;
A second mold that is inserted into the first mold from one of the penetrating portions, and has a second molding groove corresponding to the partial cross section on the one side in the remaining inner circumferential half section of the bracelet. A second mold provided in an annular shape;
A third mold that is inserted into the first mold from the other of the penetrating parts so as to be close to the second mold, and the other side portion of the bracelet on the inner peripheral side half section thereof A third mold corresponding to a cross section and provided with an annular third molding groove that forms the ring portion shape of the bracelet together with the first molding groove and the second molding groove;
Fitting the second mold so that the first and second molding grooves are aligned from the one side to the penetrating portion of the first mold,
Placing a rubber material in the vicinity of at least the first and second molding grooves;
The third mold is fitted to the first mold so as to align the third molding groove with the first and second molding grooves from the other side to the penetrating portion of the first mold.
Molding of a rubber bracelet characterized by placing the first to third molds in a heated atmosphere and pressurizing the second and third molds so as to narrow each other to mold the ring-shaped bracelet Way .

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