JP2004230656A - Method for molding warp stripe coping and mold assembly for molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, for molding a warp stripe coping, which is capable of forming a warp stripe pattern in a synthetic resin coping to be formed by extrusion molding and upgrading its decorativeness and presentable appearance by wiping out a proper image of a conventional synthetic resin coping. <P>SOLUTION: In this method, the outer surface of a coping main body is molded of an extruded molten resin by a molding hole 15 and a core 16 of the mold assembly 13 and a recessed groove is formed in the outer surface of the coping body with the help of a protrusion 23 formed on the inner circumference of the molding hole 15. In addition, a resin of different color C from the coping body is packed inside the recessed groove of the moving coping body and the outer diameter of the coping is finished by a finishing hole 18 of a finishing mold 14 and a core 19. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and a molding apparatus for forming a vertical stripe, and more particularly, to a handrail for a handrail formed by extrusion molding, a resin band of a different color is arranged at a predetermined interval in a circumferential direction on an outer surface thereof. Accordingly, the present invention relates to a molding method for forming vertical stripes continuous in the length direction, and a mold apparatus used for the method.
[0002]
[Prior art]
As shown in FIG. 9, as a handrail 1 to be attached to a wall surface such as a stairway or a passage, a synthetic resin cap 3 is attached to the outside of a core material 2 made of aluminum or the like, and the core material 2 is fixed to the wall surface 5 with a bracket 4. Such handrails are known.
[0003]
The cap 3 is made of a hard or semi-rigid synthetic resin, and is extruded into a tubular cross-sectional shape having a cut-off portion at the lower portion and a folded portion inwardly provided on both sides of the cut-off portion. It is used by mounting over.
[0004]
The handrail 1 using the cap 3 as described above requires strength from the viewpoint of safety, and the decorativeness and aesthetics are regarded as important when installed indoors. For example, coloring a synthetic resin to be performed, mixing wood powder in the synthetic resin to give a grain pattern on the outer surface, and the like are performed (for example, see Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent No. 3017913 (1st page, 2nd page, 3rd page, FIG. 1)
[0006]
[Problems to be solved by the invention]
By the way, the conventional synthetic resin shade 3 provided with coloring and wood grain pattern cannot wipe out the existing image, and cannot be said to be excellent in decorative appearance. Focusing on the display of the vertical stripe pattern for the purpose of improving decorativeness and aesthetics, the present inventors have completed the present invention by diligently repeating research and experiments in order to realize extrusion molding of the vertical stripe pattern using a synthetic resin. .
[0007]
Therefore, an object of the present invention is to improve the decorativeness and aesthetics by enabling a vertical stripe pattern to be formed by extrusion molding with a synthetic resin and wiping the image of a conventional synthetic resin skirting. It is an object of the present invention to provide a molding method and a molding die apparatus for a vertical striped hessian tree.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 forms the molten resin on the cap body by using a molding hole of a molding die and a core mold, and a ridge provided on an inner periphery of the molding hole. After forming a continuous groove in the length direction on the outer surface of the Kasagi main body, and then supplying and filling a molten resin of a different color with the Kasagi main body from around the forming hole into the concave groove, finishing the finishing mold It adopts a configuration that finishes the outer diameter of the casket with a hole and a core type.
[0009]
According to a second aspect of the present invention, a molding die having a molding hole and a core die for molding the cap body by the passage of the molten resin is fixed on the front side from which the cap body of the molding die is extruded. , Consisting of a finishing die having a core hole and a finishing hole for finishing the outer diameter of the extruded heddle body, and forming a concave groove on the outer peripheral surface of the extruded hedder body on the inner peripheral surface of the molding hole in the above molding die. A large number of ridges are projected at predetermined intervals in the circumferential direction, and the same number as the ridges is arranged radially so as to surround the periphery of the molding hole on the overlapping surface of the molding die with respect to the finishing die. A number of groove passages for recessing the end faces of the ridges from the finishing mold, and a resin distribution groove arranged so as to surround the outside of the groove passage group and communicating with the supply port of the molten resin to be filled in the groove, In the area surrounded by the resin distribution groove, apply the resin in the resin distribution groove radially It is obtained by employing the configuration in which the resin flow spaces for guiding the groove passage.
[0010]
Here, the forming hole and the finishing hole are formed in a circular shape, and the mounting space of the core die is set at the lower portion of the inner periphery of the forming hole and the finishing hole, so that the forming space becomes a partially cut-off annular shape, and also has a radial shape. The groove passage group is formed in a circular arrangement concentric with the molding hole around the molding hole, and the resin distribution groove is circular and disposed above and offset from the molding hole to form a resin flow space with the bottom surface of the groove passage. Are formed on the same surface, so that the molten resin supplied to the resin distribution groove flows evenly into all the groove passages through the resin flow space.
[0011]
The above-mentioned molding die and finishing die are fixed to the front of the main body die fixed to the tip of the extrusion molding machine so as to communicate with the resin extrusion opening, and the molten resin for the cap body extruded from the extrusion machine is molded. By passing through the forming hole of the mold, the outer diameter is formed in a circular shape, and the inner core is formed in the inner core shape.
[0012]
Since the molding hole of the molding die has a large number of ridges provided on the inner circumference, a large number of ridges continuous in the length direction at the portions of each ridge are formed on the outer surface of the cap body that is extruded through the molding hole. Will be formed.
[0013]
The resin supply port of the molding die is supplied with a molten resin of a different color from the resin serving as the kasagi body, and the molten resin of the different color is directed from the resin flow space to the groove passage while filling the resin distribution groove. Since the groove passage has the end face of each ridge recessed from the surface where the finishing mold overlaps, the different color resin flowing into the groove passage flows into the concave groove formed by each ridge. Then, this groove is filled.
[0014]
Kasagi body with concave grooves filled with a different color resin is finished to a smooth outer surface by passing through the finishing hole of the finishing mold, and finished with an outer surface tree that does not have protrusions in the different color resin filling the groove. The coping extruded from the finishing mold is cooled by water cooling or the like.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0016]
As shown in FIG. 1, a molding die apparatus for forming a vertical striped headdress tree comprises a molding die 13 fixed to the front surface of a main body die 11 having a resin extrusion opening 12 at the tip of an extrusion molding machine; And a finishing die 14 for finishing the outer diameter of the extruded main body.
[0017]
The molding die 13 is provided at a central portion thereof so that a circular molding hole 15 having a first half tapered rearward with a small diameter at the rear and a straight second half penetrated therethrough is provided with a core die 16 in a concentric arrangement. The molding space 17 formed by the molding hole 15 and the core die 16 has an annular shape that is partially cut off.
[0018]
The finishing die 14 is provided with a circular finishing hole 18 at a central position, and a core die 19 is provided in the inside thereof in a concentric arrangement. The formed molding space 20 is formed in a partially cut annular shape, the finishing hole 18 is set to an inner diameter for finishing the outer diameter of the coping, and the straight rear half of the molding hole 15 of the molding die 11 is the molding hole 18. The molding die 13 and the finishing die 14 are bolted together so that the straight second half of the molding hole 15 and the finishing hole 18 are coaxial and the molding spaces 17 and 20 coincide. Be concluded.
[0019]
The core mold 16 located in the molding hole 15 of the molding die 13 has a conical portion in the first half and a circular shaft portion in the second half, and a thin mounting piece 21 provided at the lower portion of the circular shaft portion is formed on the inner periphery of the molding hole 15. By fixing to the lower part, it becomes coaxial with the forming hole 15, and the circular shaft part forms the inner diameter of the coping.
[0020]
As shown in FIG. 4, the core mold 19 of the finishing die 14 is integrally cut out of the finishing die 14 except for a lower connecting portion 22 with respect to the finishing hole 18, and is arranged coaxially with the finishing hole 18. Thus, the diameter of the core of the core 16 of the molding die 13 becomes the same as that of the core, thereby finishing the inner diameter of the coping.
[0021]
Accordingly, the molten resin extruded from the extrusion molding machine passes through the molding spaces 17 and 20, and is formed into a continuous long cap having a concentric circular inner and outer diameter and a partially cut annular shape. Will be.
[0022]
On the inner peripheral surface of the straight part in the latter half of the molding hole 15 of the molding die 13, as shown in FIGS. 1, 2 and 6, a groove is formed which is continuous in the axial direction of the outer surface of the extruded main body. A large number of ridges 23 which are long in the axial direction are protruded at predetermined intervals in the circumferential direction, so that the inner diameter surface of the rear half of the forming hole 15 is formed by the ridges 23 and the recesses formed between the ridges 23. Are uneven surfaces that are alternately arranged in the circumferential direction.
[0023]
As described above, by providing a large number of ridges 23 on the inner peripheral surface of the molding hole 15, the outer surface of the molten resin passing through the molding hole 15 is formed into a circular shape, and at the same time, the ridges are formed on the circular outer surface. At 23, a concave groove is formed.
[0024]
As shown in FIGS. 2 and 3, an annular groove forming zone 24 arranged so as to surround the periphery of the forming hole 15 on the surface of the forming die 13 on which the finishing mold 14 overlaps, and an outer side of the groove forming zone 24. A resin distribution groove 25 arranged so as to surround the resin distribution groove 25 at a distance, and a resin flow space 26 in which a portion surrounded by the resin distribution groove 25 is recessed to guide the molten resin in the resin distribution groove 25 to the groove forming zone 24. Are provided.
[0025]
In the above-described groove forming zone 24, the same number of groove passages 27 as the number of the ridges 23 are formed radially so as to surround the periphery of the forming hole 15 and have the same width as the ridge 23 projecting into the forming hole 15. In addition, since each groove passage 27 is cut including the end of the ridge 23 in a radial arrangement so as to match the projecting position of each ridge 23, as shown in FIG. The end surface facing the finishing die 14 is recessed by the depth of the groove passage 27 from the surface on which the finishing die 14 overlaps.
[0026]
Further, the resin distribution groove 25 has a substantially semicircular cross section and is cut deeper than the groove passage 27, and is formed into a circular ring arranged to be offset upward with respect to the forming hole 15 or a circular ring separated at a lower portion. A resin supply passage 28 provided in the molding die 13 so as to open on the outer surface communicates with the upper portion of the resin distribution groove 25.
[0027]
The resin flow space 26 is formed by cutting a portion surrounded by the resin distribution groove 25 and the groove forming zone 24 into the same plane as the bottom surface of the groove passage 27, and is supplied from the resin supply path 28 to the resin distribution groove 25. After filling the resin distribution groove 25, the molten resin uniformly flows into all the groove passages 27 through the thin resin flow space 26.
[0028]
Such an even distribution of the molten resin to each groove passage 27 is achieved by disposing the resin distribution groove 25 so as to be offset upward with respect to the molding hole 15.
[0029]
That is, when the molten resin is supplied to the upper portion of the resin distribution groove 25, the flow of the molten resin in the vertical direction of the molten resin in the resin flow space 26 from the resin distribution groove 25 to the groove forming zone 24 is fast downward from the upper portion, If the distance between the resin distribution groove 25 and the groove forming zone 24 is set to be longer in the upper part and shorter from both sides to the lower part, the flow of the molten resin to the groove forming zone 24 is correspondingly slower. Will be averaged.
[0030]
In order to adjust the speed of the resin flow from the upper part to the lower part of the resin flow space 26, the bottom part of the upper part is processed so as to be partially shallower than other positions, so that the resin flow from the upper part to the lower part is small. You may make it become.
[0031]
The molding die apparatus of the present invention is configured as described above. Next, a method of molding a vertical striped hesitant using this molding die apparatus will be described.
[0032]
On the front surface of the main body mold 11 of the extrusion molding machine, a molding die 13 and a finishing mold 14 are further fixed on the front surface thereof so as to communicate with the resin extrusion opening 12 and fixed by bolts in a state of being overlapped. The outside of the molding die 13 and the finishing die 14 is covered with a heating jacket.
[0033]
In the above state, the resin extrusion port 12 of the main body mold 11, the molding hole 15 of the molding mold 13, and the finishing hole 18 of the finishing mold 14 communicate with each other coaxially, and the core mold 16 in the molding mold 13 is formed. And the core mold 19 of the finishing mold 14 are continuous, and the molding spaces 17 and 20 whose lower parts are cut off are formed inside the forming hole 15 and the finishing hole 18 so as to communicate with each other.
[0034]
In addition, a groove forming zone 24, a resin flow space 26, and a resin distribution groove 25 are formed on the front surface of the molding die 13, but when the finishing die 14 is mounted on the front surface of the molding die 13, The flat rear surface of the finishing mold overlaps the front surface of the groove forming zone 24 and the front surface outside the resin distribution groove 25, whereby the resin distribution groove 25 and the front surface of the resin flow space 26 are closed. The resin flow space 26 is finished as a shallow vertical annular space, and the groove passage 27 provided in the groove forming zone 24 is closed on the front side, thereby preventing the resin flow space 26 from forming outside. Thus, a resin flow passage in the radial direction is formed.
[0035]
The extruder is filled with a thermoplastic resin material serving as the main body of the cap and heated and melted. The resin extruder connected to the resin supply path 28 of the molding die 13 is provided with a resin material serving as a base. When the extruding machine is started in this state, the molten resin to be the kasagi main body is extruded from the resin extrusion port 12 of the main body mold 11 and molded. It passes through the molding spaces 17 and 20 of the mold 13 and the finishing mold 14.
[0036]
First, the molten resin passing through the molding space 17 of the molding die 13 has an outer diameter formed by the molding hole 15 and an inner diameter formed by the core 16 to have a cross-sectional shape of a lower cutoff ring. It is continuously formed on the long main body A.
[0037]
Since a large number of ridges 23 are provided on the inner peripheral surface of the molding hole 15 of the molding die 13 at predetermined intervals in the circumferential direction, as shown in FIG. A large number of concave grooves B are continuously formed in the length direction on the outer diameter surface of the cap body A passing through the molding space 17.
[0038]
Further, the molten resin C of a different color in a molten state supplied from the resin extruder to the resin supply path 28 of the molding die 13 at a predetermined pressure flows into the resin distribution groove 25 and fills the resin distribution groove 25 with the inner resin flow. After flowing out in the form of a film into the space 26, it enters into each groove passage 27.
[0039]
The different color resin C that has flowed into the groove passage 27 flows out toward the molding hole 15, and since each groove passage 27 reaches the tip end surface of the ridge 23, the outer periphery of the cap body A is protruded by the ridge 23. It flows into the concave groove B formed on the radial surface and continuously fills the concave groove B of the cap body A that moves by extrusion.
[0040]
As described above, the long cap body A in which the inside of the concave groove B is filled with the different color resin C moves to the molding space 20 of the finishing mold 14 immediately after the inside of the concave groove B is filled with the different color resin C. Then, the outer diameter is formed by the finishing hole 18, and at the same time, the outer surface of the resin C of a different color is also formed so as to match the outer surface of the kasagi body A, and the inner diameter is formed by the core mold 19 so that the inner and outer diameters are regulated. It will be a long shaka tree D finished to dimensions.
[0041]
When filling the inside of the groove B with the resin C of a different color, the kasagi body A and the groove B are filled with heat. The different-color resin C filling the inside is melted and integrated, and the different-color resin C does not peel off from the inside of the concave groove B at all.
[0042]
Since the finishing hole 18 has the same diameter as the molding hole 15 of the molding die 13, the outer surface of the resin C of a different color that fills the concave groove B matches the outer diameter surface of the long cap body A. Therefore, the outer diameter surface of the long shank D extruded from the finishing hole 18 is finished in a circumferentially smooth curved surface without the resin C of a different color filling the concave groove B rising.
[0043]
The long shank D that has been extruded from the finishing hole 18 is cooled by passing through a cooling tank such as water cooling to prevent the cross-sectional shape from being deformed, and then into a rolled package.
[0044]
As shown in FIG. 7, the long cap tree D manufactured as described above is used as a cap that is externally fitted to a metal core material in a handrail such as a staircase or a passage. The main body A and the resin C of a different color that fills the concave groove B of the main body A, the outer diameter surface becomes a vertical stripe (stripe) pattern in which bands of different colors are alternately arranged in the circumferential direction. By wiping out the image of the Kasagi, it is possible to improve decorativeness and aesthetics.
[0045]
The combination of the ground color of the main body A described above and the color of the resin C of a different color that fills the groove B can be freely selected, and in the illustrated case, the width of the groove B formed by the ridge 23 is shown. Is set to be relatively narrow, and the interval between the concave grooves B is also adjusted to the width of the concave grooves B to form a narrow vertical stripe pattern, but the width of the ridges 23 and the groove passages 27 provided in the molding die 13 is reduced. By setting it wider or changing the interval between the ridge 23 and the groove passage 27, it is possible to form vertical stripe patterns having different widths and intervals.
[0046]
Further, by using a plurality of different color resin supply sections composed of a combination of the above-described molding die 13 and finishing die 14, and sequentially connecting them in a forward direction, the concave groove B formed in the long body portion A of the long shade can be two colors. By filling with the resin C of the above-mentioned different color, a vertical stripe pattern of three or more colors can also be formed.
[0047]
For example, in the first molding die 13 and the finishing die 14, some of the concave grooves B formed in the long shank body A are filled with the first different color resin C, and then the second If the remaining concave groove B is filled with the second different color resin C in the molding die 13 and the finishing die 14, a three-color vertical stripe pattern can be formed with the ground color of the kasagi body A. Selection of each groove B to be filled with the resin C of a different color can be performed by changing the arrangement of the groove passages 27 provided in the molding die 13 in the first and second molding dies 13.
[0048]
【The invention's effect】
As described above, according to the present invention, by forming a molding die, a concave groove is formed on the outer surface of the extruded cap body, and after filling the molten resin with the cap body and a different color in this concave groove, finishing is performed. Since the outer diameter of the cap is finished with the finishing hole of the mold, vertical stripes can be formed on the outer diameter of the cap body that is formed by extrusion, and the conventional synthetic resin handrail cap has By wiping out the image, it is possible to improve the decorativeness and aesthetic appearance, and to produce a colorful and attractive vertical striped shade tree.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a main part showing a molding die apparatus for forming a vertical striped hemp tree. FIG. 2 is a front view of the molding die as viewed from an arrow II-II in FIG. 1. FIG. FIG. 4 is a front view of the finishing mold. FIG. 5 is a perspective view of the finishing mold seen from the front side. FIG. 6 is a perspective view showing the structure of a ridge and a groove passage provided in the forming mold. FIG. 7 (A) is a perspective view showing a vertical striped cap, and FIG. 7 (B) is an enlarged cross-sectional view showing the relationship between the state of formation of a concave groove formed in the cap and the different color resin filling the same. FIG. 9 is an enlarged longitudinal sectional view showing a use state. FIG. 9 is a longitudinal sectional view showing a conventional handrail.
DESCRIPTION OF SYMBOLS 11 Main-body mold | die 12 Resin extrusion opening 13 Molding die 14 Finishing die 15 Molding hole 16 Core mold 17 Molding space 18 Finishing hole 19 Core mold 20 Molding space 21 Mounting piece 22 Connecting part 23 Projection 24 Groove forming zone 25 Resin distribution groove 26 Resin flow space 27 Groove passage 28 Resin supply path A Kasagi main body B Concave groove C Different color resin D Kasagi

Claims (2)

The molten resin is molded into the cap body with the molding hole of the molding die and the core mold, and a concave groove that is continuous in the length direction is formed on the outer surface of the cap body with a ridge provided on the inner periphery of the molding hole, Next, after filling and supplying the molten resin of the shade body and a different color from the periphery of the molding hole into the above-mentioned groove, the vertical stripe shade tree which finishes the outer diameter of the shade tree with the finishing hole of the finishing mold and the core mold. Molding method. A molding die provided with a molding hole and a core mold for molding the cap body by the passage of the molten resin, and the capping body of the molding die is fixed on the front side where the cap body is extruded. It consists of a finishing hole for finishing the diameter and a finishing die provided with a core die. A number of ridges are formed on the inner peripheral surface of the forming hole of the above-mentioned forming die to form a concave groove on the outer surface of the extruded main body. The same number of ridges as the ridges are arranged on the overlapping surface of the molding die with respect to the finishing die so as to surround the periphery of the molding hole. A large number of groove passages to be recessed from the mold, and an arrangement surrounding the outside of the groove passage group, the resin distribution groove communicating with the supply port of the molten resin to be filled in the groove, and the resin distribution groove. The resin that guides the resin in the resin distribution groove to each radial groove passage Re molding die apparatus of the vertical stripes coping provided with a space.

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