JP5881757B2 - Method for manufacturing fireworks ball - Google Patents

Description

The present invention relates to the production how ball skin loading gunpowder in fireworks.

  The fireworks fireworks are formed in a spherical shape by placing stars and explosives called split powder on two concentric spheres in two hemispherical skins, and connecting these two hemispherical skins. The leather is made by sticking Japanese paper, but industrially mass-produced is generally formed by pressing cardboard or other thick paper. The shape accuracy, strength, etc. of the ball skin affect the shape and roundness of the launch fireworks, so that not only the manufacturing cost but also the quality is required.

  As a method for manufacturing a hide, which has been widely used in the past, there is a method of making a hemispherical peel by pressing two circular mounts as described in the prior art section of Patent Document 1. A circular mount is formed into a three-dimensional hemisphere by making a radial cut and performing a drawing press.

  Moreover, the thing of patent document 1 is mentioned as a prior art regarding manufacture of another bead skin. The present invention provides a structure for preventing distortion of a ball skin in a high-quality firework fireworks with excellent shape retention, which does not cause distortion due to drying and can ensure the roundness of the ball skin, and a method for manufacturing the structure. A hemispherical concave spherical surface is formed of a cardboard material 1 formed by joining and integrating a circular endothelium 3 made of the same material smaller in diameter than the circular skin 2 on the inner surface of a circular skin 2 of a predetermined diameter made of cardboard. A short cylindrical shape composed of a spiral paper tube placed on a press lower die 7 having a hemispherical convex spherical surface corresponding to the lower die 7 and having a stepped portion 6 cut out at the outer peripheral edge. The spiral paper tube material 5 is fitted and locked, and pressed under such a state, the step portion 6 of the spiral paper tube material 5 is joined and integrated with the step portion 4 of the cardboard material 1, and the whole is integrally formed into a hemispherical shape. That's it.

Japanese Patent Laid-Open No. 6-17497

  However, two conventional circular mounts with radial cuts are squeezed and pressed to form a leather. Deformation such as warping and distortion is very likely to occur and is affected by humidity and temperature differences. The shape change over time has occurred. For example, in the assembly process, it takes time to dry the adhesive after inserting the lead wire into the ball skin, but deformation can occur even in the limited time. When such a shape change occurs over time, the roundness of the fireworks will be adversely affected, and it will be necessary to refit the ball into a spherical shape when assembling with gunpowder, and workability will be significantly impaired. It was. Moreover, since the upper end of the hemisphere becomes uneven due to the drawing press, it has to be cut, the material yield is lowered, and scraps are generated.

  The one described in Patent Document 1 is provided with the short cylindrical spiral paper tube 5 on the hemispherical upper portion, so that the shape change with time as described above becomes very small, and the upper end of the hemispherical portion Although cutting is not necessary, the shape may be changed although it is minute, and the use of the spiral paper tube 5 increases the working time and the cost of parts, leading to an increase in manufacturing cost.

  Therefore, an object of the present invention is to reduce the change in shape of the leather over time, improve the roundness, improve workability, and reduce the manufacturing cost.

The method for producing a firework ball of the present invention includes at least a first step of preparing a cylindrical first ball skin material and a plate-shaped second ball skin material, and a first in a press die. A hollow hemisphere that is joined at the boundary and integrally opened at the boundary by integrally molding the ball skin material with a press. A third step , wherein in the first step, the first ball skin material rolls and engages a fan-shaped mount having male and female engaging portions on the left and right side sides to engage the wharf It is a circular mount which is formed in a conical cylinder, and the second ball skin material serves as a bottom plate. In the second step, the bottom plate is provided on the small diameter side of the truncated conical cylinder .

  The fan-shaped mount has a shape in which the center side of the fan shape is cut off, the original arc becomes an outer arc, and the cut portion becomes an inner arc. In this way, the fan-shaped shape can be used as a mount without being cut out, and in this case, the conical cylindrical skin material can be formed without using the bottom plate.

  When stacking a plurality of the ball skin materials, the intervals between the engagement portions on the circumference of the upper end of the ball skin material are equal so that the engagement portions of the respective ball skin materials do not overlap. It is preferable to place them apart. The overall strength can be maintained by shifting the angular positions of the engaging portions having weak strengths. It is preferable that the engagement portions are spaced apart by 180 degrees on the circumference of the ball skin material when the two ball skin materials are stacked. Thus, by making the said engaging parts oppose, intensity distribution can be made more uniform and the roundness of a skin can be improved.

  The bottom plate is preferably provided with a circular mount having a diameter equal to or larger than the diameter-reduced end of the truncated conical cylinder inscribed in the truncated conical cylinder. Thereby, the intensity | strength of a ball skin can be made more uniform.

  The ball skin material is an upright body having an open top formed by assembling a mount having a shape obtained by developing the same. More specifically, in addition to a circular mount mounted on the truncated conical cylinder, a conical cylinder, a cylinder, a multi-stage conical cylinder in which different tapered surfaces are combined, or a plurality of these stacked, and hollow by pressing. It refers to the state before being formed into a hemispherical shape. That is, the ball skin material is an assembly in which a mount having the shape of the developed view is assembled, and can be assembled integrally from one mount, or can be assembled from a plurality of mounts obtained by dividing the developed view. . Moreover, the said ball skin material can also pile up the thing of the same shape, and can also pile up the thing of a different shape. Moreover, a ball skin can also be formed by overlapping and pressing the above-described ball skin material according to the present invention with a conventional circular mount having a radial cut. Although the upper part of the ball skin material is mainly opened in a circular shape, the present invention is applicable not only to a circular shape but also to a polygonal shape such as a case where a hollow polygonal pyramid having an open bottom surface is used upside down. Is applicable.

  In the present invention, it is also preferable to provide a plurality of small holes in the fan-shaped mount and / or the circular mount. The resulting ball skin can be used, for example, as an inner core paper in a small ball fired that is packed in a plurality of small pieces of fireworks or a double-layered or multi-layered piece of fireworks such as a double core. Can do. These inner skins are provided with holes for passing blast flames, and the holes can be more reliably provided than the conventional leathers that have been squeezed and pressed into circular mounts that are radially cut.

  It is also preferable to make a conventional radial cut in the circular mount.

  According to the present invention, it is possible to obtain a firework ball skin with very little distortion due to changes over time, to improve roundness, to improve workability, and to reduce manufacturing costs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a firework ball 1 of Example 1 according to the present invention. (A) is the front view of the ball skin material 2 of the Example 1. FIG. (B) is a front view of the hull 1 of the first embodiment. It is a perspective view from the front of the truncated conical cylinder 3 of the same Example 1. FIG. It is a perspective view from the back of the truncated conical cylinder 3 of the Example 1. FIG. (A) is a top view of the fan-shaped mount 5 of the same Example 1. FIG. FIG. 2B is a plan view of the circular mount 6 of the first embodiment. It is a schematic diagram of the front cross section which shows the mode of the press molding set of the ball skin material 2 in the Example 1. FIG. It is a perspective view of the ball skin material 2 'which is a modification of Example 1 by this invention. (A) is the perspective view from the front of the ball skin material 202 (conical cylinder 203) of Example 2 by this invention. (B) is a top view of the fan-shaped mount 205 of the second embodiment. (A) is the perspective view from the front of the skin material 320 (conical cylinder 330) of Example 3 by this invention. (B) is a top view of the fan-shaped mount 305 of the third embodiment. (A) is the perspective view from the front of the ball skin material 402 (cylindrical body 403) of Example 4 by this invention. (B) is a top view of the square mount 405 of the fourth embodiment. (A) is the perspective view from the front of the ball skin material 502 (two-stage cone cylinder 503) of Example 5 by this invention. (B) is a front view of the two-stage conical cylinder 503 of the fifth embodiment. It is a top view of the mount 505 of the same Example 5. (A), (b) is a top view of mount 505 'by the modification of Example 5, respectively. (A) is a top view of the ball skin material 502 (two-stage conical cylinder 503) of the fifth embodiment. (B) is a top view of the ball skin material 502 '(two-stage conical cylinder 503') of the modification of Example 5. FIG. (A) is a front view of the ball skin material 602 (two-stage conical cylinder 603) of Example 6 by this invention. (B) is a front view of the ball skin material 602 (two-stage conical cylinder 635) of Example 6; It is a schematic diagram of the front cross section which shows the mode of the set of the press molding of the ball skin material 602 in the Example 6. FIG. It is a perspective view from the back of the truncated cone cylinder 703 of Example 7 by this invention. It is a top view of the fan-shaped mount 705 of the Example 7. It is a perspective view of the truncated conical cylinder 803 of the same Example 8. (A) is a front view of the ball skin material 902 of Example 9. FIG. (B) is a front view of the skin 1 of Example 9. FIG. (A) is a perspective view of the cylinder 903 of Example 9. FIG. It is a schematic diagram of the front cross section which shows the mode of the press molding set of the ball skin material 902 in Example 9. It is a perspective view of the circular mount 1006 of the same Example 10. It is a schematic diagram of the front cross section which shows the mode of the press molding set of the ball skin material 1006 in the Example 10. FIG. 1 is a perspective view of an example actually manufactured based on Example 1. FIG. It is a perspective view from another direction of the example actually manufactured based on Example 1. FIG. 10 is a perspective view of an example actually manufactured based on Example 9. FIG. It is a perspective view from another direction of the example actually manufactured based on Example 9. FIG. It is the 1st process of the method of manufacturing a ball skin of Example 10. It is the 2nd process of the method for manufacturing a ball skin of Example 10. FIG. 9 is a third step of the method for manufacturing a ball skin of Example 10. FIG.

  A firework ball 1 (hereinafter simply referred to as a ball 1) according to Embodiment 1 of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the hull 1 is a hollow hemisphere having an upper opening, and includes an upper portion 1 a, a lower portion 1 b, and a joint 1 c formed in a ring shape in the weft direction at the boundary between them. It is a firework firework molded into a hollow hemisphere with an open top. The ball skin 1 is formed into a hollow hemispherical shape by drawing and pressing a later-described ball skin material 2, and at the upper end of the circumference, two ball skins 1 are combined to form a firework ball. A joint 1c is formed. The ball skin 1 is formed by integrally molding a ball skin material 2 composed of at least an upper leather material constituting the upper part and a lower leather material constituting the bottom part by a press. In addition to this, other ball skin materials may be added. The material is generally cardboard, but other materials may be adopted as appropriate. The joint portion 1c has a shape crushed by a press, and an irregularly shaped groove is generally formed. In addition, press marks may be formed on the surface of the ball skin 1.

  Next, the manufacturing method of the skin 1 of Example 1 is demonstrated. The ball skin material 2 is formed into a hollow hemisphere by drawing and pressing. The bead material 2 is composed of a truncated conical cylinder 3 as a first bead material and a bottom plate 4 as a second bead material provided on the small diameter side of the truncated conical tube 3 (FIG. 2A). )reference). You may add a 3rd skin material to this suitably. Therefore, the ball skin 1 includes an upper part 12 of a hemisphere in which a lower part made of the truncated conical cylinder 3 is cut out, and a lower part 13 having an arcuate surface connected to the lower part of the upper part 12 made of the bottom plate 4. It is molded integrally (see FIGS. 1 and 2B). In the present embodiment, two ball skin materials 2 are stacked and integrally press-molded, so that the ball skin 1 has a double structure in the thickness direction.

  As shown in FIGS. 2 (a), 3 and 4, the truncated conical cylinder 3 is a cylindrical body that is reduced in diameter downward, and a reduced diameter end 31 is formed at the lower end on the small diameter side. An enlarged end 32 is formed at the upper end on the radial side. A tapered surface 33 whose peripheral diameter transitions is formed between the reduced diameter end 31 and the expanded diameter end 32. The taper surface 33 becomes an outer inclined surface that widens toward the top.

  As shown in FIG. 5A, the truncated conical cylinder 3 is formed by rounding a fan-shaped mount 5 having a male engaging portion 51 and a female engaging portion 52 on the left and right sides, so that the male engaging portion 51 and the female The engaging portion 52 is engaged to form the engaging portion 34 (see FIGS. 3 and 4). The fan-shaped mount 5 has a shape in which the center side of the fan shape is cut off, the original arc becomes the outer arc 53, and the periphery of the cut portion becomes the inner arc 54. The fan-shaped central angle θ formed by the outer arc 53 or the inner arc 54 can take an arbitrary value.

  As shown in FIG. 5A, the male engaging portion 51 is formed so as to protrude from the side of the fan-shaped mount 5, and the female engaging portion 52 is provided near the opposite side of the fan-shaped mount 5. It is a slit. The shape for engagement is not limited to this and can be used. The engaging portion 34 is formed by winding the fan-shaped mount 5 and inserting the male engaging portion 51 into the female engaging portion 52 (see FIGS. 3 and 4). The engaging portion 34 may be glued. Further, since the engaging portion 34 has a partially double plate thickness in the truncated conical cylinder 3, the side of the fan-shaped mount 5 in the vicinity of the male engaging portion 51 and the female engaging portion 52. The sides may be cut out as appropriate.

  As shown in FIG. 5B, the bottom plate 4 is a circular mount 6 and has a diameter equal to or larger than the diameter of the reduced diameter end 31 of the truncated conical cylinder 3.

  As shown in FIG. 5B, grooves 61 are provided radially on one side of the bottom plate 4 so as to extend from a position away from the center to the circumference. The grooves 61 can be easily provided by stamping radial marks arranged in the same shape when the bottom plate 4 is pressed and punched. It can be appropriately adjusted depending on the size of the ball skin 1, the material of the bottom plate 4, the type of firework balls to be created, and the like. The depth of the groove 61 can take any value from zero to the plate thickness. That is, the groove 61 may not be provided, or the groove 61 may be cut. Moreover, the groove | channel 61 is not restricted to 8 radial thing like FIG.5 (b), The increase / decrease in the number and adjustment of a width | variety and length can also be performed. The shape of the groove 61 is not limited to a radial shape, and for example, a plurality of concentric circles or a spiral shape may be provided. The groove 61 may be provided on both sides as well as on one side, and may have different shapes on the front and back sides.

  The ball skin material 2 is comprised by mounting the baseplate 4 inside the truncated conical cylinder 3 (refer Fig.2 (a)). As a result, the ball skin material 2 becomes a ball skin material, that is, a solid body close to the hemispherical ball skin 1. Since the diameter of the bottom plate 4 is equal to or larger than the diameter of the reduced diameter end 31, when the bottom plate 4 is placed inside from the enlarged diameter end 32 side of the truncated conical cylinder 3, the bottom plate 4 is inscribed in the vicinity of the reduced diameter end 31. The Rukoto. The bottom plate 4 is placed so that the groove 61 is on the upper side, but the reverse is also possible. Also, the bottom plate 4 can be provided circumscribing from below the truncated conical cylinder 3. In addition, the ball skin material 2 is an assembled ball skin material in which the circular mount 6 having the shape of the developed view and the bottom plate 4 are assembled, and can be assembled from a plurality of mounts obtained by dividing the developed view in this way, As shown in the following embodiment, it can be integrally assembled from one mount.

  As shown in FIG. 6, the ball skin 1 is formed by stacking and pressing two ball skin materials 2. That is, the truncated conical cylinder 3, the bottom plate 4, the truncated conical cylinder 3, and the bottom plate 4 are stacked in this order from the bottom, but it is not always necessary to follow this order. Moreover, you may shape | mold by using only one without using the ball skin material 2, and the ball skin material 2 can also be multilayered into three or more layers. Further, in the ball skin material 2, it is not necessary that the truncated cone cylinder 3 and the bottom plate 4 correspond one-to-one, and two bottom plates 4 can be provided for one truncated cone cylinder 3. It is good to press-mold after suitably pasting between each part.

  When the ball skin material 2 is formed in multiple layers, it is preferable to shift the overlapping portions so that the intervals on the circumference of the engaging portions 34 are equal. When the two ball skin materials 2 are stacked, the two engaging portions 34 face each other so as not to overlap, that is, these angular positions are spaced apart by 180 degrees. When three ball skin materials 2 are stacked, the angular positions of the respective engaging portions 34 may be spaced apart by 120 degrees.

  As shown in FIG. 6, press molding of the ball skin material 2 is performed while a partial drawing / bending is applied by a convex hemispherical male mold 7 and a concave hemispherical female mold 8. Is formed into a hollow hemispherical skin 1 having an open top. When pressing, the material may be moistened or heated as necessary. The fan-shaped mount 5 is expected to have a cutting allowance. At the same time as bending, the circumferential upper end portion 21 of the ball skin material 2 is cut to prepare the joint 1c of the ball skin 1, but such a cutting allowance is not provided. In addition, the outer arc 53 of the fan-shaped backing sheet 5 may be used as it is for the joint 1c of the ball skin 1 by being abutted and formed simultaneously with the press bending.

  As the material of the truncated cone 3 and the bottom plate 4, thick paper such as yellow paperboard is used. In addition, other cardboard, Japanese paper, craft paper, newspaper, or the like can be used. In addition, a thin-walled material such as a pulp material, an aggregate of used paper, other plant fibers, synthetic fibers, and other synthetic resins can be used. Moreover, a flame retardant, a waterproof material, etc. can also be used.

  The approximate size of each member will be described by taking No. 5 ball as an example. The No. 5 ball 1 has a diameter of 140 mm and a thickness of 3 mm. Before press molding, the height of the ball skin material 2 is 65 mm, the reduced diameter end 31 is φ100 mm, and the enlarged diameter end 32 is φ145 mm. The fan-shaped mount 5 has an outer arc 53 of φ390 mm, an inner arc 54 of φ250 mm, a central angle θ of 140 degrees, and a thickness of 1.5 mm. The engagement margin of the engagement portion 34 of the fan-shaped mount 5 is set to 15 mm on one side. The circular mount 6 has a diameter of 97 mm and a thickness of 1.5 mm. These are only examples, and even the same No. 5 ball skin 1 can be made with dimensions other than these.

  The ball skin 1 is used for the production of fireworks balls in the same manner as the ball skin by the conventional manufacturing method. In other words, prepare two ball skins 1 and make a hole in the center of one of them, insert a lead wire, fill the inside of the two ball skins 1 with crackers, parent stars, core stars, etc. At the same time, a top-up paper such as Japanese paper or kraft paper is pasted on the outside to form a spherical fireworks ball.

  The effect of the skin 1 according to the embodiment of the present invention will be described. In the case of using a conventional circular backing with two circular cuts and drawing and pressing to make a ball, the closer to the upper end of the hemispherical circumference, the larger the amount of drawing during bending, and the material meat becomes locally In addition, since the fluctuation of the material thickness varies on the circumference of the hemisphere, such as warping and distortion with time after being formed into a hemisphere. The shape change was enormous. However, the ball skin 1 according to the embodiment of the present invention does not form a spherical surface from a completely flat surface as in the prior art, but press-forms a three-dimensional shaped ball skin material 2 closer to a hemispherical shape, As a result, the thickness of the material and the uneven distribution of the material material in the squeezed bent portion are suppressed as much as possible, and a hemispherical shape with a more uniform thickness is formed. Therefore, the ball skin 1 has a higher roundness and hardly generates distortion due to a change with time. For example, there is no distortion in the ball skin while drying the adhesive in the part where the lead wire is inserted into the ball skin in the assembly process of the firework ball like the conventional ball skin. Therefore, working efficiency is improved by using the ball skin 1. Moreover, since the shape change of the ball skin 1 itself with time is very small, the roundness of the firework ball can be maintained even when the ball sticking is finished and stored.

  In addition to the above-described effects, the hull 1 can be manufactured at a low cost. The conventional configuration in which the short tubular paper tube is provided on the upper part of the hemispherical shape has the effect that the shape change with time does not occur much and the roundness is high as in the case of the ball skin 1, but in comparison with this, the ball The skin 1 is more resistant to shape changes and can be manufactured at less than half the cost.

  With the configuration in which the male engaging portion 51 is inserted into the female engaging portion 52, the truncated conical cylinder 3 can be easily and inexpensively assembled from the fan-shaped mount 5 without using other members.

  By providing the groove 61 in the circular mount 6 in advance, the circular mount 6 can be easily adapted to the press die even when it is molded from a flat surface to a spherical surface, and can be smoothly performed. In particular, when the grooves 61 are provided radially, it is possible to reduce the unevenness of the spherical surface by absorbing the remainder of the material meat at the bent portion where the aperture is locally large, and to improve the dimensional accuracy and prevent distortion due to changes over time. Can do.

  Since the fan-shaped mount 5 and the circular mount 6 have simple shapes, it is possible to easily assemble the truncated conical cylinder 3 or the ball skin material 2. When the bottom plate 4 is placed in the vicinity of the reduced diameter end 31 of the truncated conical cylinder 3 and installed inside, the frustoconical cylinder 3 and the bottom plate are picked up by picking up the peripheral edge of the truncated cone cylinder 3 of the ball skin material 2 and lifting it. 4 can be handled integrally, and work efficiency improves. Moreover, compared with the case where the bottom plate 4 is externally installed from the lower side of the truncated conical cylinder 3, the strength against the internal pressure of the portion corresponding to the bottom plate 4 in the ball skin 1 is improved, and the overall strength of the ball skin 1 is made more uniform. can do.

  The ball skin 1 can be formed by stacking an arbitrary number of ball skin materials 2, and the thickness and strength can be adjusted even if components having the same dimensions are used. When the ball skin material 2 is multilayered, the strength distribution in the ball skin 1 can be made more uniform by equalizing the intervals of the respective engaging portions 34 at the circumferential upper end portion 21 of the ball skin material 2. it can.

  By cutting the upper circumferential end 21 of the ball skin material 2 at the same time as bending, the joint 1c of the ball skin 1 is prepared. It becomes easy and the roundness increases. On the other hand, without considering the cutting allowance on the fan-shaped mount 5, the outer arc 53 of the fan-shaped mount 5 can be used as it is as the joint 1 c of the leather 1 by pressing and bending simultaneously with the press bending. And the generation of scraps is eliminated. In the case of pressing a circular mount with a conventional radial cut into a leather, unevenness is inevitably generated at the upper end of the circumference by press bending. However, according to the present invention, the outer arc 53 of the fan-shaped mount 5 is formed. Is the joint 1c of the ball skin 1 as it is, the unevenness generated at the upper end of the circumference by press bending is very small, and the flatness of the joint 1c is also maintained by abutting and molding at the bottom dead center of the press. Is that you can. In this case, the material density at the circumferential upper end of the ball skin 1 is increased, and the shape retainability of roundness is further improved.

  As shown in FIG. 7, a hemispherical ball is obtained by press-molding a ball skin material 2 'similar to that of Example 1 on a conventional circular mount 9' having a radial cut and stacked. It can also be a skin. Further, the mount 9 ′ may be placed on the ball skin material 2 ′ and overlapped. In this way, even if the conventional circular mount is overlapped, the shape change over time of the ball skin is reduced by forming it integrally with the ball skin material 2 'without local thickening due to the drawing. The effects of the present invention can be obtained.

  A ball skin 201 according to a second embodiment of the present invention will be described with reference to FIG. The reference numerals attached to the respective components are in the 200s in the first embodiment, and the same points as those in the first embodiment are used, and the description thereof is omitted. As shown in FIG. 8A, the ball skin 201 according to the second embodiment is configured such that the ball skin material 202 is formed from one component without providing the bottom plate 4 separately from the truncated conical cylinder 3. Here, instead of the fan-shaped mount 5, a fan-shaped mount 205 having no inner arc 54 is used (see FIG. 8B). When the engaging portion 234 is formed by engaging the male engaging portion 251 and the female engaging portion 252, the conical tube 203 is assembled instead of the truncated conical tube 3 as in the first embodiment (FIG. 8). (See (a)). This conical cylinder 203 is used as it is as the hull material 202, and press-molded in the same manner as in Example 1 to obtain the hull 201.

  In the second embodiment, since the number of parts is reduced, further cost reduction can be achieved from the viewpoint of material cost and work efficiency. It is also possible to obtain a ball skin by pressing the ball skin material 202 of Example 2 on the ball skin material 2 of Example 1 and press-molding it. In addition, the ball skin can be obtained by overlaying the ball skin material 202 of Example 2 with a conventional circular mount with a radial cut and press-molding, and the effect of the present invention is also exhibited here. The Rukoto.

  A ball skin 301 according to a third embodiment of the present invention will be described with reference to FIG. The ball skin 301 of the third embodiment is a modification of the second embodiment. In this modification, a fan-shaped mount 305 in which the apex of the fan-shaped mount 205 is cut out is used (see FIG. 9B). That is, a small inner arc 354 is formed on the fan mount 305, although not as much as the inner arc 54 in the fan mount 5 of the first embodiment. A hole 356 is formed at the lower end of the conical cylinder 330 assembled by winding the fan-shaped mount 305 (see FIG. 9A).

  According to the ball skin 301 according to the third embodiment, the bottom portion of the ball skin 201 is thickened in the second embodiment. However, since the surplus material meat can be absorbed by the holes 356 in the drawing bending, the thickness can be made more uniform. it can. The hole 356 remaining in the ball skin 301 after press molding can be used to insert a lead wire when assembling the firework ball. The hole 356 of the other hemisphere side bead 301 may be filled when applying the upper paper, or the other hemisphere side may be the above-described bead 1 or bead 201 without the hole 356. . Further, a fan-shaped mount 305 may be provided that corresponds to the slit 436 in Example 4 below.

  A ball skin 401 according to a fourth embodiment of the present invention will be described with reference to FIG. The reference numerals given to the respective components are the 400s in the second embodiment, and the same points as those in the second embodiment are used and the description thereof is omitted. A ball skin 401 according to the fourth embodiment is configured by using the cylindrical body 403 (see FIG. 10A) instead of the conical cylinder 203 according to the second embodiment to constitute the ball skin material 402. The cylindrical body 403 is assembled by rolling the square mount 405 (see FIG. 10B) and engaging the male engaging portion 451 and the female engaging portion 452 to form the engaging portion 434. Eight slits 436 are provided at the bottom of the cylindrical body 403. The slit 436 is provided at a right angle from the starting side, but may be provided so as to be inclined obliquely with respect to the height direction of the cylindrical body 403. The cylindrical body 403 is used as a ball skin material 402, and the ball skin 401 is obtained by press molding this. In this embodiment, the cylindrical body 403 is press-formed without being overlapped, but two may be overlapped.

  In the press molding, the lower part 413 of the ball skin 401 has a particularly large amount of drawing, and can be formed into a hemisphere while avoiding irregular crushing and deformation by the slits 436. In this embodiment, the amount of drawing is increased in the same manner as in the conventional method of drawing and pressing a circular mount with a radial cut into a ball skin. As a result, the amount of molding is reduced, and the portion to be squeezed is the lower portion 413 of the ball skin 401, so that the roundness of the mating surface 411 of the ball skin 401 is maintained. The slits 436 are not limited to the above-mentioned eight, but may be another configuration such as six. In addition, the slit 436 may have a notched shape as well as a cut shape.

  A ball skin 501 according to a fifth embodiment of the present invention will be described with reference to FIGS. The reference numerals given to the respective components are the 500s in the second embodiment, the same points as in the second embodiment are used, and the description thereof is omitted. In the fifth embodiment, the ball skin material 502 is formed by using a two-stage conical cylinder 503 in which the angle of the tapered surface in the conical cylinder 203 of the second embodiment is different between the upper part and the lower part. Specifically, as shown in FIGS. 11A and 11B, the two-stage conical cylinder 503 includes an upper tapered surface 533a and a lower tapered surface 533b, and the upper tapered surface 533a has a smaller taper angle than the lower tapered surface 533b. It becomes. It is good also as a multistage conical cylinder of three steps or more similarly to a present Example.

  As shown in FIG. 12, the mount 505, which is a developed view of the two-stage conical cylinder 503, includes an upper mount 555a that forms the upper tapered surface 533a and a lower mount 555b that forms the lower tapered surface 533b when assembled. The upper mount 555a has a shape similar to the fan-shaped mount 5 (see FIG. 5A) of the first embodiment, and has a fan shape including an outer arc 553 and an inner arc 554. The lower mount 555b has a fan shape having an arc 557 similar in shape to the fan mount 205 of the second embodiment (see FIG. 8B). The lower mount 555b is provided in contact with the inner arc 554 of the upper mount 555a, and the upper mount 555a and the lower mount 555b are integrated by a connecting portion 556. In this embodiment, as shown in FIG. 12, a connecting portion 556 is provided in the middle to connect the upper mount 555a and the lower tapered surface 533b. However, the position of the connecting portion 556 can be arbitrarily set. For example, as shown in FIG. 13A, the position of the connecting portion 556 ′ in the arc 557 ′ of the lower mount 555b ′ is provided at the end, or as shown in FIG. 13B, the inner arc 554 of the upper mount 555a ′. The position of the connecting portion 556 ′ in ′ can be provided at the end.

  As shown in FIG. 12, the upper mount 555a includes an upper male engaging portion 551a and an upper female engaging portion 552a, and the lower mount 555b includes a lower male engaging portion 551b and a lower female engaging portion 552b. The upper and lower ends of the upper male engaging portion 551a and the upper end of the lower male engaging portion 551b are cut out to reduce the material thickness of the overlapped portion. The upper engagement portion 534a and the lower engagement portion 534b are arranged at the same angular position in the circumferential direction when assembled from the mount 505 to the two-stage conical cylinder 503 (see FIG. 14A). However, it may be provided at an angle different from the phase of the angular position, for example, at an angular position separated by 180 degrees (see FIG. 14B). The relative angular position of the upper engaging portion 534a and the lower engaging portion 534b can be changed by adjusting the position of the connecting portion 556 described above (see FIGS. 13A and 13B).

  The upper male engaging portion 551a and the upper female engaging portion 552a are engaged to form the upper engaging portion 534a, and the lower male engaging portion 551b and the lower female engaging portion 552b are engaged to form the lower engaging portion. By forming 534b, the two-stage conical cylinder 503 is assembled from the mount 505. In the same manner as in the first embodiment, the upper engagement portion 534a and the lower engagement portion 534b are press-molded as a ball skin material 502 by overlapping two two-stage conical cylinders 503 so that the angular positions in the circumferential direction do not overlap. .

  According to the fifth embodiment of the present invention, the ball skin material 502 has a more nearly hemispherical shape, so the amount of drawing and elongation of the material during press molding is reduced, and the ball skin 501 is made more uniform and stable. It can be formed into a shape. The upper tapered surface 533a and the lower tapered surface 533b are connected by the connecting portion 556, and the upper tapered surface 533a is placed on the lower tapered surface 533b, so that the shape of the two-stage conical cylinder 503 is not collapsed. , Can be handled integrally.

  By setting the connecting portion 556 at an arbitrary position of the arc 557 of the lower mount 555b or the inner arc 554 of the upper mount 555a (see FIGS. 13 and 14), the strength of the ball skin material 502 is more uniform when assembled. Can be achieved. For example, as shown in FIG. 14A, the double engagement cylinder 503 having the same angular position in the circumferential direction between the upper engagement portion 534a and the lower engagement portion 534b is used to improve the yield and assembly of the mount. When overlapping the other two-stage conical cylinder 503 to form the ball skin material 502, these engaging portions can be shifted in phase by 180 degrees to achieve uniform intensity distribution. Further, for example, as shown in FIG. 14B, the phases of the upper engaging portion 534a ′ and the lower engaging portion 534b ′ are shifted by 180 degrees, and the intensity distribution is made uniform in one two-stage conical cylinder 503 ′. Further, even when two layers are stacked, the intensity distribution can be further uniformed by shifting them by 90 degrees. In many cases, in the application of the present invention, such uniform strength is achieved by using a ball skin material itself, that is, by assembling into a standing body having a circular upper portion in advance and then press molding. Thus, a sufficient effect can be obtained.

  A ball skin 601 according to a sixth embodiment of the present invention will be described with reference to FIGS. 15 and 16. The sixth embodiment is a modification of the fifth embodiment, and the reference numerals given to the respective components are the 600th in the fifth embodiment, and the points common to the fifth embodiment are used and the description thereof is omitted. The ball skin 601 is formed by overlapping a two-stage conical cylinder 603 and a two-stage conical cylinder 635 having different shapes, respectively, to form a ball skin material 602. In the two-stage conical cylinder 603 shown in FIG. 15A, the ratio of the lower tapered surface 633b in the height direction is larger than that of the upper tapered surface 633a, and the two-stage conical cylinder 635 shown in FIG. The ratio is larger than that of the lower tapered surface 637b. As shown in FIG. 16, these two-stage conical cylinder 603 and two-stage conical cylinder 635 are overlapped to form a ball skin material 602. By press-molding this ball skin material 602, the upper and lower seams have different heights, and a ball skin 601 with a more uniform strength distribution is formed. The two-stage conical cylinder 603 and the two-stage conical cylinder 635 may be stacked upside down. Further, the ratio between the upper tapered surfaces 633a and 637a and the lower tapered surfaces 633b and 637b can be arbitrarily set. For example, in addition to the height of the upper and lower seams, these may be set in consideration of the stability when placing the ball skin material 602 on the female mold 680.

  A ball skin 701 according to a seventh embodiment of the present invention will be described with reference to FIGS. The ball skin 701 uses a truncated conical cylinder 703 having the same shape as that of the first embodiment, and is formed by providing a plurality of small holes 725 in advance in the truncated conical cylinder 703 (see FIG. 17). The truncated conical cylinder 703 is constructed by assembling the fan-shaped mount 705 shown in FIG. Although illustration is omitted, a similar small hole is provided in the bottom plate 740 as well. In this embodiment, a bottom plate 740 (not shown) is placed on the truncated conical cylinder 703 to form a ball skin material 702, and the ball skin 701 is obtained by press molding without overlapping the two ball skin materials 702. In this embodiment, a small hole 725 is provided in the same mount as the fan mount 5 of the first embodiment. Similarly, the fan mount 5, the circular mount 6, the fan mounts 205 and 305, the square mount 405 or the mount Small holes 725 may be provided at 505 and 655.

  This ball skin 701 is used, for example, as an inner core paper in a ball for small balls packed in a plurality of small fireworks or a fireworks having a double or multi-layer structure such as an eight core. The small hole 725 is for passing a flame when the fireworks ball is ignited. Conventionally, two circular circular cuts with radial cuts are overlapped and squeezed and pressed to form a leather. A large portion of the material overlaps due to squeezing and bending at the top. Even if the small holes are provided in advance, there are many cases where they are blocked by the drawing bending, and it is necessary to open more than the number of small holes aimed. If it does so, the number of the small holes which penetrated will be different for every skin, and the malfunction at the time of an explosion and the strength fall were caused. However, according to the ball skin 701 of the present embodiment, the portion where the paper of the material overlaps after the squeezing bending is only the engaging portion 734, so the set small hole 725 is not blocked by the press molding, and it is surely Unnecessary strength reduction can be avoided through the blast flame at launch.

  A truncated conical cylinder 803 according to an eighth embodiment of the present invention will be described with reference to FIG. The truncated conical cylinder 803 is obtained by slightly changing the truncated conical cylinder 703 having the same shape as that of the first embodiment, and is formed by providing a notch 836 in advance at the diameter-expanded end 832 of the truncated conical cylinder 803. Yes (see FIG. 19). Accordingly, the truncated conical cylinder 803 is easily deformed during pressing. Further, a saliva 837 is provided at the reduced diameter end 831 so that the bottom plate 4 (see FIG. 2 and the like) can be easily received during pressing. As for other parts of the skin material such as the bottom plate, any one of the above-mentioned embodiments can be adopted as appropriate.

  A ball skin 901 according to a ninth embodiment of the present invention will be described with reference to FIGS. In manufacturing the ball skin 901, a cylinder 903 having the same shape as that of the fourth embodiment is used, but there is no slit 436 and a cylindrical ball skin material obtained by cutting a paper tube into an appropriate length. As for other parts of the ball skin material such as the bottom plate 904, any one of the above-described embodiments can be appropriately employed. As shown in FIG. 22, the manufacturing process is performed by placing the ball skin material 902 composed of the cylinder 903 and the bottom plate 904 in the female die 8 and pressing the male die 7 as described in the above embodiment. According to the ninth embodiment, it is possible to obtain a firework ball with very little distortion due to changes over time, to improve roundness, to improve workability, and to reduce manufacturing costs. The cylinder 903 is manufactured only by cutting the paper tube. Compared with the truncated conical cylinder 3, the process is simplified and the dimensional accuracy during pressing is increased.

  The circular mount 1006 shown in FIG. 23 is provided with a plurality of cuts 1061 in the radial direction in the same manner as the circular mount 6 in FIG. It is the modification which overlapped up and down.

  24 and 25 are actual examples actually manufactured based on the first embodiment. The joint portion has a concave shape as compared with other portions, but may have a convex shape depending on the location. Moreover, you may arrange | position and press another ball skin material suitably in a junction part.

  FIG. 26 and FIG. 27 are actual examples actually manufactured based on the ninth embodiment. The joint portion has a concave shape as compared with other portions, but may have a convex shape depending on the location.

  Example 10 shows a manufacturing method different from the manufacturing method of Example 9 (see FIG. 22), as shown in FIGS.

  As shown in FIG. 28, in the first step, the cylinder 903 is attached to the male mold 7, and in the second step, the male mold 7 is pushed down to press-contact the female mold 8 as shown in FIG. A curved cylinder 903 ′ that is curved in a straight line is manufactured and removed from the male mold 7. By repeating this, a plurality of curved cylinders 903 ′ are prepared in advance.

  As shown in FIG. 30, in the third step, a curved cylinder 903 ′ is attached to the male mold 7, a bottom plate 904 is placed on the female mold 8, the male mold 7 is pushed down, and is pressed against the female mold 8. FIG. A ball skin 901 shown in b) is manufactured. The third step is repeated to produce a plurality of ball skins 901.

  Instead of the manufacturing process shown in FIGS. 28 to 30, one or one ball skin 901 may be sequentially manufactured by repeating the first to third processes individually. That is, when the curved cylinder 903 ′ is formed in FIG. 29, the male mold 7 is lifted as it is without being removed from the male mold 7, the bottom plate 904 is placed on the female mold 8, the male mold 7 is lowered, and the ball 901 May be manufactured.

  The present invention is not limited to the above-described embodiment, and modifications and the like can be made without departing from the technical idea of the present invention. It will be included in the technical scope of the invention. For example, a floating firework made in the same structure as a launching firework is not classified as a launching firework depending on a legal point of view or the like, but it is of course included in the launching firework referred to in the present invention. Further, in the practice of the present invention, a plurality of the configurations in the above-described embodiments can be used in combination, and the configurations in each of the embodiments can be adopted in other embodiments. For example, the ball skin material 202 in the first embodiment is overlapped with the ball skin material 2 in the first embodiment and press-molded, or the small holes 725 in the seventh embodiment are provided in the mount 505 in the fifth embodiment.

1 ... Tamahide
1a ... Upper part
1b ... Bottom
1c ... Junction
2 ... Ball skin material
21 ... Upper end of circumference
3 ... The truncated cone
31 ... Reduced diameter end
32 ... Expanded end
33 ... Taper surface
34 ... engaging part
5 ... Fan-shaped mount
51 ... Male engaging part
52 ... Female engaging part
53 ... Outer arc 54 ... Inner arc
4 ... Bottom plate
6 ... Circular mount
61 ... groove
7 ... Male
8 ... Female type
201 ... Tamahide
202 ・ ・ ・ Ball skin material
205 ... Fan-shaped mount
251 ... Male engaging part
252 ... Female engaging portion
234 ... engaging portion
203 ... conical cylinder
301 ... Tamahide
305 ... Fan-shaped mount
354 ... Inner arc
330 ... conical cylinder
356 ... hole
401 ... Ball skin
403 ... Cylinder
436 ... slit 402 ... ball skin material
405 ... Square mount
451 ... Male engaging part
452 ... Female engaging portion
501 ... Tamahide
503 ... Two-stage conical cylinder
533a ... Upper tapered surface
533b ... Lower tapered surface
556 ... Connecting part
534a ... Upper engaging portion
534b ... Lower engaging portion
505 ... Mount
505a ... Upper mount
553 ... Outer arc
554 ... Inner arc
551a ... Upper male engaging portion
552a ... Upper female engaging portion
505b ... Lower mount
557 ... Arc
551b ... Lower male engaging portion
552b ... Lower female engaging portion
502 ... Ball skin material
601 ... Tamahide
603 ... Two-stage conical cylinder
635 ... Two-stage conical cylinder
602 ... Ball skin material
633a ... Upper tapered surface
633b ... Lower tapered surface
637a ... Upper tapered surface
637b ... Lower tapered surface
701 ... Ball skin 725 ... Small hole
702 ... Ball skin material
703 ... truncated cone
705 ... Fan-shaped mount
734 ... engaging portion
803 ... truncated conical cylinder 832 ... diameter-expanded end 836 ... notch 831 ... reduced diameter end 837 ... saliva 901 ... ball skin 902 ... ball skin material 903 ...・ Cylinder 904 ... bottom plate

Claims (1)

At least a first step of preparing a cylindrical first ball skin material and a plate-shaped second ball skin material;
A second step of placing the first ball skin material in the press die and the second ball skin material in the lower opening;
A third step in which the ball skin material is integrally formed with a press, joined at the boundary thereof, and formed into a hollow hemisphere having an open top;
A method for manufacturing a firework ball with a fireworks , comprising:
In the first step, the first ball skin material is formed into a truncated cone by rolling and engaging a fan-shaped mount having male and female engaging portions on the left and right sides, and the second It is a circular mount whose ball skin material is the bottom plate,
In the second step, the bottom plate is provided on the small diameter side of the truncated conical cylinder .