WO2018109907A1 - 成形用芯材 - Google Patents
成形用芯材 Download PDFInfo
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- WO2018109907A1 WO2018109907A1 PCT/JP2016/087408 JP2016087408W WO2018109907A1 WO 2018109907 A1 WO2018109907 A1 WO 2018109907A1 JP 2016087408 W JP2016087408 W JP 2016087408W WO 2018109907 A1 WO2018109907 A1 WO 2018109907A1
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- divided piece
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- rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/76—Cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Definitions
- the present disclosure relates to a molding core.
- a rod-like core material is used.
- the hollow material is obtained by molding the material on the outer peripheral surface of the core material and thereafter extracting the core material from the molded product.
- Patent Document 1 proposes that a core material (that is, a molding core) which can be divided into a plurality of opposing dividing members sandwiching a space at a central portion be used to separate the dividing members from the molded product and then pull out the members. It is done.
- a core material that is, a molding core
- the spacer or the like is likely to be deformed when the length in the longitudinal direction of the molded product is increased, and the shape may be unstable.
- the spacer and the dividing member need to have a certain thickness from the viewpoint of strength, the size of the hollow portion must be a certain size or more, and it may be used depending on the size of the hollow portion of the molded article. Can not.
- One aspect of the present disclosure preferably provides a molding core material that is easy to pull out from a molded product, is excellent in shape stability, and can form a hollow portion of any size.
- the molding core material includes a plurality of divided pieces that form one rod-like body by being assembled.
- the plurality of divided pieces includes a rod-shaped first divided piece, a rod-shaped second and third divided pieces, and a rod-shaped fourth divided piece and a fifth divided piece.
- the first divided piece is surrounded by the other plurality of divided pieces among the plurality of divided pieces in the assembled state.
- the second divided piece and the third divided piece are disposed so as to sandwich the first divided piece in the first direction orthogonal to the longitudinal direction while in contact with the first divided piece, and a part of the outer peripheral surface of the rod-like member Configure.
- the fourth divided piece and the fifth divided piece are disposed so as to sandwich the first divided piece in the second direction orthogonal to the first direction while in contact with the first divided piece, and a part of the outer peripheral surface of the rod-like member Configure.
- the first divided piece not in contact with the molded product can be easily pulled out from the hollow portion of the molded product by being surrounded by other divided pieces after formation of the molded product. .
- the second split piece and the third split piece can be pulled out of the hollow portion of the molded product using the space from which the first split piece is pulled out.
- the fourth divided piece and the fifth divided piece are simultaneously and easily molded by moving the opposing fourth divided piece and the fifth divided piece in the hollow portion of the molded product while moving in the radial direction of the hollow portion. Can be pulled out of the hollow part of the
- the molding core material according to one aspect of the present disclosure does not have a space between adjacent ones of the plurality of divided pieces, the length in the longitudinal direction of the molding core material is increased. Excellent shape stability. In addition, since the size of each divided piece is unlikely to be restricted in terms of strength, a hollow portion of any size can be formed.
- the shape in the cross section perpendicular to the longitudinal direction of the first divided piece may be a rectangle, a square or a circle. According to such a configuration, a commercially available member can be used as the first divided piece. Moreover, when the cross-sectional shape of the first divided piece is rectangular or square, processing of the other divided pieces becomes easy, and the part cost can be reduced. Furthermore, when the cross-sectional shape of the first divided piece is a perfect circle, it becomes easy to pull out the first divided piece.
- the second divided piece, the third divided piece, the fourth divided piece, and the fifth divided piece are each formed on the first divided piece by at least one screw inserted in the radial direction of the rod-like body. It may be fixed. According to such a configuration, since the plurality of divided pieces can be fixed without using a complicated fixing mechanism, the processing cost of the plurality of divided pieces can be reduced. Also, the molding core material can be used repeatedly.
- the first split piece may have a protrusion that protrudes in the longitudinal direction more than the other split pieces. According to such a configuration, it is possible to easily pull out only the first divided piece among the plurality of divided pieces by holding the projection.
- At least one of the second split piece, the third split piece, the fourth split piece, and the fifth split piece is a widened portion in which the outer peripheral surface side of the rod is wider than the other portions. May be included. According to such a configuration, it is possible to manufacture high quality molded articles in which the outer diameter changes along the longitudinal direction.
- FIG. 1A is a schematic side view of a molding core material of an embodiment
- FIG. 1B is a schematic plan view of the molding core material of FIG. 1A
- FIG. 2 is a schematic sectional view taken along line II-II of the molding core material of FIG. 1A
- 3A to 3E are schematic cross-sectional views of a molding core material of an embodiment different from that of FIG.
- FIG. 4 is a schematic cross-sectional view of a molding core material of an embodiment different from FIGS. 2 and 3A-3E.
- FIG. 5 is a schematic side view of a molding core material of an embodiment different from FIG. 1A.
- FIG. 6 is a schematic cross-sectional view taken along line VI-VI of the molding core material of FIG. 7A is a schematic side view of a molding core material of an embodiment different from FIGS. 1A and 5, and
- FIG. 7B is a schematic cross section taken along line VIIB-VIIB of the molding core material of FIG. 7A.
- the molding core 1 shown in FIGS. 1A, 1B and 2 is a rod-shaped molding core for producing a long and hollow molded article.
- the cross-sectional shape perpendicular to the longitudinal direction of the molding core material 1 is a true circle. That is, the molding core 1 is a cylindrical body.
- molding can be arbitrarily designed according to the shape of a molded article, it can be 0.1 m or more and 2 m or less, for example.
- the molding core material 1 includes a plurality of divided pieces constituting one rod-like body by being assembled, and a plurality of screws for fixing the plurality of divided pieces.
- the molding core material 1 is configured to be divisible into a plurality of divided pieces by detachment of the plurality of screws.
- the molding core 1 includes five divided pieces of a first divided piece 11, a second divided piece 12, a third divided piece 13, a fourth divided piece 14, and a fifth divided piece 15. .
- These divided pieces are rod-like members obtained by dividing one rod-like body (i.e., cylindrical body) in a plane parallel to the longitudinal direction.
- the molding core material 1 does not have a space or a gap between adjacent ones of the plurality of divided pieces. That is, the plurality of divided pieces are densely arranged such that the contact surfaces are in close contact with each other.
- the material of each divided piece is metal.
- aluminum is preferable. By using aluminum, the weight of the molding core 1 can be reduced. In addition, since the use of aluminum facilitates the scraping, the formation cost of each divided piece can be reduced.
- the first split piece 11 is disposed at the center of the molding core 1, and in a state where a plurality of split pieces are gathered, the other four split pieces (that is, the second split pieces 12, The third divided piece 13, the fourth divided piece 14, and the fifth divided piece 15) are disposed so as to surround the entire outer peripheral surface.
- the center of gravity of the first divided piece 11 coincides with the center of gravity of the molding core 1.
- an "peripheral surface” means the surface parallel to a longitudinal direction among the outer surfaces of a rod-shaped body.
- the first divided piece 11 is a rod-like member as described above. Moreover, in the present embodiment, the cross-sectional shape perpendicular to the longitudinal direction of the first divided piece 11 is a rectangular shape, more specifically, a square. That is, the first divided piece 11 is a square pillar.
- the second divided piece 12 is in contact with one of the four side surfaces constituting the outer peripheral surface of the first divided piece 11. Further, among the four side surfaces of the first divided piece 11, the third divided piece 13 is in contact with the side surface that faces the side surface that the second divided piece 12 is in contact with. Furthermore, the fourth divided piece 14 and the fifth divided piece 15 are in contact with the remaining two side surfaces of the first divided piece 11 so as to face each other.
- the first split piece 11 has a longer length in the longitudinal direction than the other split pieces, and as shown in FIGS. 1A and 1B, has a protrusion 11A that protrudes in the longitudinal direction more than the other split pieces. .
- the protrusion 11A is a region not used for molding of a molded product.
- the outer peripheral surface formed of the four side surfaces of the first divided piece 11 is the whole of the second divided piece 12, the third divided piece 13, and the third divided piece in the assembled state of a plurality of divided pieces. It is in contact with one of the four divided pieces 14 and the fifth divided piece 15. That is, the outer peripheral surface of the first divided piece 11 is not exposed in the forming area. Therefore, the first divided piece 11 is not coated with the molding material.
- each of the cross sectional shapes perpendicular to the longitudinal direction of the second divided piece 12 and the third divided piece 13 is a rectangular shape in which one side is curved in an arc shape among four sides. is there.
- the side surface forming the curved side constitutes a part of the outer peripheral surface of the molding core 1.
- the second split piece 12 and the third split piece 13 respectively abut on the first split piece 11.
- the second split piece 12 and the third split piece 13 are disposed so as to sandwich the first split piece 11 in a first direction (Y-axis direction in the drawing) orthogonal to the longitudinal direction.
- the second split piece 12 and the third split piece 13 are in a mirror image relationship centering on the first split piece 11.
- the second split piece 12 and the third split piece 13 flat side surfaces facing the side surface that constitutes the outer peripheral surface of the molding core 1 abut on the side surface of the first split piece 11.
- the maximum width of the second direction (X-axis direction in the drawing) orthogonal to the first direction of the second split piece 12 and the third split piece 13 is the same as the maximum width of the first split piece 11 in the second direction.
- the maximum width of the second split piece 12 and the third split piece 13 in the second direction may be equal to or less than the maximum width of the first split piece 11 in the second direction.
- the remaining two side surfaces of the second divided piece 12 and the third divided piece 13 (that is, the side surfaces in contact with the fourth divided piece 14 or the fifth divided piece 15) extend in parallel with the Y axis. It is flush with the side of the one-piece piece 11.
- the fourth split piece 14 and the fifth split piece 15 are rod-like members as described above. Further, as shown in FIG. 2, the cross-sectional shapes perpendicular to the longitudinal direction of the fourth divisional piece 14 and the fifth divisional piece 15 are shapes each including an arc and a chord.
- the side surface forming this arc constitutes a part of the outer peripheral surface of the molding core 1. Therefore, the outer peripheral surface of the molding core 1 is formed by the side surfaces of the second divided pieces 12, the fourth divided pieces 14, the third divided pieces 13, and the fifth divided pieces 15 in this order. There is. Further, the side surfaces forming chords in the cross sections of the fourth divided piece 14 and the fifth divided piece 15 extend in parallel with the Y axis, and are in contact with the first divided piece 11, the second divided piece 12, and the third divided piece. Contact.
- the fourth divided piece 14 and the fifth divided piece 15 are disposed so as to sandwich the first divided piece 11, the second divided piece 12, and the third divided piece 13 in the second direction (the X-axis direction in the drawing).
- the fourth split piece 14 and the fifth split piece 15 are in a mirror image relationship centering on the first split piece 11.
- the plurality of screws 2A, 2B, 2C, and 2D fix the second split piece 12, the third split piece 13, the fourth split piece 14, and the fifth split piece 15 to the first split piece 11. These screws are inserted through the second split piece 12, the third split piece 13, the fourth split piece 14, and the fifth split piece 15 in the radial direction of the molding core material 1.
- a total of two screw holes will be provided in the both ends of the peripheral face of the 2nd division piece 12, respectively one each.
- the two screw holes respectively extend in the radial direction of the molding core 1, penetrate the first divided piece 11, and reach the inside of the third divided piece 13.
- the second split piece 12 and the third split piece 13 are fixed to the first split piece 11 by screwing the screws 2A and 2B into these two screw holes respectively.
- a total of two screw holes are provided at both ends of the outer peripheral surface of the fourth divided piece 14, respectively.
- the two screw holes respectively extend in the radial direction of the molding core 1, penetrate the first divided piece 11, and reach the inside of the fifth divided piece 15.
- the fourth split piece 14 and the fifth split piece 15 are fixed to the first split piece 11 by screwing the screws 2C and 2D into the two screw holes, respectively.
- the screws 2A, 2B, 2C, 2D may be known ones.
- a commercially available screwdriver or a hexagonal wrench may be used to attach and remove the screws 2A, 2B, 2C, and 2D.
- the portions of the molding core 1 to which the screws 2A, 2B, 2C, 2D are attached are not used for molding of a molded product.
- molding ie, the manufacturing method of the molded article using the core material 1 for shaping
- the method includes a first step of molding a material on the outer peripheral surface of the molding core 1, and a second step of drawing the molding core 1 from the molded product molded in the first step.
- Step 1 a hollow molded article is formed by laminating the material on the outer peripheral surface of the molding core 1 in a state where a plurality of divided pieces are collected and fixed.
- a material of a molded article The resin single-piece
- this fiber for example, glass fiber or carbon fiber is used.
- molding there exist paste form, a sheet form, etc.
- Step 2 the molding core 1 having the molded product formed on the outer peripheral surface is drawn out from the molded product in the central axis direction of the hollow portion while being divided into a plurality of divided pieces.
- the step of pulling out the second split piece 12 and the third split piece 13 from the hollow part of the molded article and the second split piece 12 and the third split piece 13 the opposing surfaces of the fourth split piece 14 and the fifth split piece 15
- the first divided piece 11 can be easily pulled out by gripping the projection 11A of the first divided piece 11. This extraction can be performed, for example, by hooking a jig in the through hole 11B provided in the protrusion 11A.
- the molding core 1 can be quickly pulled out of the molded article while suppressing damage to the molded article. That is, long and hollow molded articles can be manufactured at low cost and high quality.
- a plurality of divided pieces individually pulled out after this step are collected again, and a plurality of screws 2A, 2B, 2C, and 2D are screwed again, so that the molding core material 1 is manufactured for the next molded product. It can be provided.
- the following effects can be obtained.
- the maximum width in the second direction of each of the second split piece 12 and the third split piece 13 is the same as the maximum width in the second direction of the first split piece 11, so after the first split piece 11 is pulled out, By shifting the second divided piece 12 and the third divided piece 13 toward the central axis of the molding core 1, it can be pulled out while being peeled off from the molded product.
- the molding core 1 since no space is formed between adjacent ones of the plurality of divided pieces, the shape is stable even if the length of the molding core 1 in the longitudinal direction is increased. Excellent in quality. In addition, since the size of each divided piece is unlikely to be restricted in terms of strength, a hollow portion of any size can be formed. Moreover, since the core material 1 for shaping
- the molding core 1 can be used repeatedly by attaching and detaching at least one screw (four screws in the present embodiment).
- the first divided piece 11 Since the first divided piece 11 is a square pole, a commercial item can be used as the first divided piece 11. In addition, since the contact surface between the first divided piece 11 and the remaining ones of the plurality of divided pieces is a flat surface, the processing cost of the plurality of divided pieces can be reduced.
- the molding core material 101 shown in FIGS. 5 and 6 is a rod-like molding core material for producing a long and hollow molded article.
- the molding core material 101 is provided with at least one enlarged diameter portion 102 whose outer diameter is larger than the other portions in the region excluding the longitudinal end.
- the molding core material 101 includes a plurality of divided pieces that form one rod-like body by being collected, and a plurality of screws (not shown) that fix the plurality of divided pieces.
- the materials and screws of the plurality of divided pieces can be the same as the molding core 1 shown in FIG.
- the molding core material 101 includes the first divided piece 11, the second divided piece 112, the third divided piece 113, the first auxiliary divided piece 114, the second auxiliary divided piece 115, and the third auxiliary divided piece 116. , And the fourth auxiliary divided piece 117, and seven divided pieces. These divided pieces are rod-like members obtained by dividing one rod-like body in a plane parallel to the longitudinal direction. Further, the molding core material 101 does not have a space or a gap between adjacent divided pieces among the plurality of divided pieces.
- the first divided piece 11 is the same as the first divided piece 11 of the molding core material 1 of FIG.
- the second split piece 112 and the third split piece 113 are obtained by adding the later-described widened portions 112A and 113A to the second split piece 12 and the third split piece 13 of the molding core material 1 of FIG.
- the second split piece 112 and the third split piece 113 respectively abut on the first split piece 11. Further, the second divided piece 112 and the third divided piece 113 are disposed so as to sandwich the first divided piece 11 in the first direction (the Y-axis direction in the drawing).
- Each of the second divided piece 112 and the third divided piece 113 has at least one widened portion 112A, 113A which is wider on the outer peripheral surface side of the molding core 101 than the other portions in the longitudinal direction.
- These widened portions 112A and 113A form the enlarged diameter portion 102 of the molding core material 101 in the state of aggregation of a plurality of divided pieces. That is, the widened portions 112A and 113A constitute a part of the outer peripheral surface of the enlarged diameter portion 102.
- the first auxiliary divided piece 114 and the second auxiliary divided piece 115 are obtained by adding the widening portions 114A and 115A described later to the fourth divided piece 14 of the molding core 1 of FIG. 1 to the center of the molding core 101
- the plane passing through the axis is bisected in the Y-axis direction.
- the third auxiliary divided piece 116 and the fourth auxiliary divided piece 117 are obtained by similarly dividing the fifth divided piece 15 of the forming core material 1 of FIG. 1 to which the widening portions 116A and 117A described later are added. is there. That is, in the present embodiment, the first auxiliary divided piece 114 and the second auxiliary divided piece 115 correspond to the fourth divided piece, and the third auxiliary divided piece 116 and the fourth auxiliary divided piece 117 correspond to the fifth divided piece. .
- the first auxiliary divided piece 114 and the third auxiliary divided piece 116 are disposed so as to sandwich the first divided piece 11 and the second divided piece 112 in the second direction (the X-axis direction in the drawing).
- the second auxiliary divided piece 115 and the fourth auxiliary divided piece 117 are arranged to sandwich the first divided piece 11 and the third divided piece 113 in the second direction.
- the first auxiliary divisions 114, the second auxiliary divisions 115, the third auxiliary divisions 116, and the fourth auxiliary divisions 117 are wider on the outer peripheral surface side of the molding core 101 than the other portions in the longitudinal direction. It has at least one widened part 114A, 115A, 116A, 117A respectively.
- the widening portions 114A, 115A, 116A, 117A, together with the widening portions 112A, 113A of the second split piece 112 and the third split piece 113 in the assembled state of the plurality of split pieces, increase the diameter of the forming core material 101.
- Form 102 is
- the diameter-increased portion 102 of the molding core 101 is larger in diameter than the other portions over the entire circumference of the molding core 101.
- the widening portions 112A, 114A, 115A, 113A, 117A, 116A are configured such that the outer peripheral surfaces thereof are smoothly connected in a state where a plurality of divided pieces are gathered.
- the method includes a first step of forming a material on the outer peripheral surface of the forming core material 101, and a second step of extracting the forming core material 101 from the molded product formed in the first step.
- the first step is the same as the first step in the method of using the molding core 1 of FIG. 1, the description will be omitted.
- Step 2 is a step of removing a plurality of screws (not shown), a step of pulling out only the first divided piece 11 from the hollow portion of the molded product, and a second divided step after the first divided piece 11 is pulled out.
- these auxiliary divided pieces are respectively arranged in the second direction After being moved to the central axis side of the hollow portion along the (X-axis direction in the figure), it is further moved to the central axis side of the hollow portion along the first direction (Y-axis direction in the figure).
- the auxiliary divided pieces can be pulled out of the hollow portion of the molded product without bringing the widened portion into contact with the inner peripheral surface of the molded product.
- the first auxiliary divided piece 114 is moved in the right direction in the drawing to a position not in contact with the second auxiliary divided piece 115.
- the first auxiliary divided piece 114 is moved downward to the position where the upper end of the widening portion 114A falls within the diameter of the non-widening portion in the drawing, and then the drawing is performed.
- the steps of FIG. It is the same as the second step in the method of use.
- the enlarged diameter portion 102 can produce a molded article whose outer diameter changes along the longitudinal direction.
- the quality such as strength is better than that of the conventional product formed by bonding these portions. Excellent.
- the shapes of the plurality of divided pieces are merely an example. That is, if the first divided piece is surrounded by the other divided pieces of the plurality of divided pieces and the remaining plurality of divided pieces can be pulled out using the space from which the first divided piece is pulled out, a plurality of divided pieces
- the shape of the divided pieces can be designed arbitrarily.
- the widths of the second split piece 12 and the third split piece 13 in the X-axis direction are radially outward from the central axis of the molding core 1. May be formed to be smaller toward the That is, in the second split piece 12 or the third split piece 13, the tapers are inclined such that the contact surface with the fourth split piece 14 and the contact surface with the fifth split piece 15 are closer to each other as they go outward. It may be a plane. With such a configuration, since the force directed to the center is applied to the second split piece 12 and the third split piece 13 by the stress of the fourth split piece 14 and the fifth split piece 15, the shape accuracy in the assembled state is improves.
- the maximum width of the second split piece 12 and the third split piece 13 in the X-axis direction is not necessarily smaller than the maximum width of the first split piece 11 in the X-axis direction.
- segmentation piece 11 may be a perfect circle.
- the first divided piece 11 can be easily pulled out.
- the fourth divided piece 14 and the fifth divided piece 15 of the second divided piece 12 and the third divided piece 13 The contact surface of the can be a tapered surface.
- the cross-sectional shape perpendicular to the longitudinal direction of the first divided piece 11 is not limited to a rectangle or a perfect circle, and may be any shape such as a polygon other than a rectangle, an ellipse, or a star.
- the first divided pieces 11 do not necessarily have to be disposed at the center of the molding core 1, and may be disposed at a position slightly offset from the center.
- each split piece may be further split into a plurality of auxiliary split pieces.
- the outer shape of the molding core 1, 101 is not limited to a circle, and can be appropriately designed according to the shape of the hollow portion of the molded product.
- molding may be a rectangular shape by which the corner was chamfered.
- the outer shape of the molding core may be a shape other than a circle and a rectangle.
- the shape of the outer shape may change along the longitudinal direction.
- the outer shapes of the enlarged diameter portion 202 and the non-diameter enlarged portion may be different.
- the cross-sectional shape of the non-diameter-expanded portion is the first divided piece 11, the second divided piece 212, the third divided piece 213, the first auxiliary divided piece 214, the second auxiliary divided piece 215, the first A chamfered square is formed by seven divided pieces of the three auxiliary divided pieces 216 and the fourth auxiliary divided piece 217.
- the cross-sectional shape of the enlarged diameter portion 202 is formed by the enlarged portions 212A, 213A, 214A, 215A, 216A, 217A of the plurality of divided pieces and is a perfect circle.
- the plurality of divided pieces do not necessarily have to be solid structures, and divided pieces of a hollow structure as shown in FIG. 4 may be used.
- a hollow structure By adopting such a structure, it is possible to reduce the weight of the molding core material.
- such divided pieces can be formed by metal drawing, a relatively complicated shape can be realized. Even when the plurality of divided pieces have a hollow structure, no space or void is formed between the plurality of divided pieces.
- the method of fixing the plurality of divided pieces is not limited to using a screw, and various fixing methods can be used. Also, the plurality of divided pieces and the fixture may be integrated.
- the function of one component in the above embodiment may be distributed as a plurality of components, or the function of a plurality of components may be integrated into one component.
- part of the configuration of the above embodiment may be omitted.
- at least a part of the configuration of the above-described embodiment may be added to or replaced with the configuration of the other above-described embodiment.
- all the aspects contained in the technical thought specified from the wording as described in a claim are an embodiment of this indication.
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Abstract
Description
11…第1分割片、11A…突出部、11B…貫通孔、
12,112,212…第2分割片、13,113,213…第3分割片、
14…第4分割片、15…第5分割片、102,202…拡径部分、
114,214…第1補助分割片、115,215…第2補助分割片、
116,216…第3補助分割片、117,217…第4補助分割片、
112A,113A,114A,115A,116A,117A…拡幅部分、
212A,213A,214A,215A,216A,217A…拡幅部分。
[1.第1実施形態]
[1-1.構成]
図1A,1B及び図2に示す成形用芯材1は、長尺かつ中空の成形品を製造するための棒状の成形用芯材である。本実施形態では、図2に示すように、成形用芯材1の長手方向と垂直な断面形状は真円である。つまり、成形用芯材1は円柱状体である。なお、成形用芯材1の長さは成形品の形状に合わせて任意に設計可能であるが、例えば0.1m以上2m以下とすることができる。
第1分割片11は、図2に示すように、成形用芯材1の中心に配置され、複数の分割片が集合した状態で、他の4つの分割片(つまり、第2分割片12、第3分割片13、第4分割片14、及び第5分割片15)に外周面の全体を囲まれるように配置される。第1分割片11の重心は、成形用芯材1の重心と一致する。なお、「外周面」とは、棒状体の外面のうち、長手方向に平行な面を意味する。
第2分割片12及び第3分割片13は、上述のように棒状の部材である。また、第2分割片12及び第3分割片13の長手方向と垂直な断面形状は、それぞれ、図2に示すように、4つの辺のうち、1つの辺が円弧状に湾曲した矩形状である。この湾曲した辺を形成する側面は、成形用芯材1の外周面の一部を構成している。
第4分割片14及び第5分割片15は、上述のように棒状の部材である。また、第4分割片14及び第5分割片15の長手方向と垂直な断面形状は、それぞれ、図2に示すように、円弧と弦とからなる形状である。この円弧を形成する側面は、成形用芯材1の外周面の一部を構成している。従って、成形用芯材1の外周面は、第2分割片12、第4分割片14、第3分割片13、及び第5分割片15の順に配置された各分割片の側面によって形成されている。また、第4分割片14及び第5分割片15の断面において弦を形成する側面は、Y軸と平行に延伸し、第1分割片11、第2分割片12、及び第3分割片と当接する。
複数のネジ2A,2B,2C,2Dは、第2分割片12、第3分割片13、第4分割片14、及び第5分割片15を第1分割片11に固定する。これらのネジは、第2分割片12、第3分割片13、第4分割片14、及び第5分割片15に対し、成形用芯材1の半径方向に挿通されている。
以下に、成形用芯材1の使用方法、すなわち成形用芯材1を用いた成形品の製造方法について説明する。本方法は、成形用芯材1の外周面上に材料を成形する第1工程と、第1工程で成形した成形品から成形用芯材1を引き抜く第2工程とを備える。
本工程では、複数の分割片を集合及び固定した状態の成形用芯材1の外周面上に材料を積層することで、中空の成形品を形成する。成形品の材料としては、特に限定されるものではなく、樹脂単体、樹脂と繊維との複合材(いわゆる繊維強化プラスチック)等が挙げられる。この繊維としては、例えばガラス繊維や炭素繊維が用いられる。また、成形用芯材1に積層する材料の形状としては、ペースト状、シート状等がある。
本工程では、成形品が外周面上に成形された成形用芯材1を、複数の分割片に分割しつつ、成形品から中空部の中心軸方向に引き抜く。
以上詳述した実施形態によれば、以下の効果が得られる。
(1a)第1分割片11は成形品に当接しないので、成形品の形成後、成形品の中空部から容易に引き抜くことができる。第1分割片11を引き抜いた後は、第2分割片12及び第3分割片13は、第1分割片11を引き抜いた空間を使用して成形品の中空部から比較的容易に引き抜くことができる。その後、第4分割片14及び第5分割片15を成形品の中空部内で重ね合わせてから引き抜くことで、第4分割片及び第5分割片を同時に、かつ容易に成形品の中空部から引き抜くことができる。これらの結果、特別な治具や装置を用いることなく、成形品を傷付けずに、かつ迅速に成形用芯材1を成形品から引き抜くことができる。
[2-1.構成]
図5及び図6に示す成形用芯材101は、長尺かつ中空の成形品を製造するための棒状の成形用芯材である。成形用芯材101は、長手方向の端部を除いた領域に、他の部分よりも外径が大きくされた少なくとも1つの拡径部分102を備える。
第1分割片11は、図1の成形用芯材1の第1分割片11と同様のものであるため、同一の符号を付して説明を省略する。
第2分割片112及び第3分割片113は、図1の成形用芯材1の第2分割片12及び第3分割片13に後述の拡幅部分112A,113Aを付加したものである。第2分割片112及び第3分割片113は、第1分割片11とそれぞれ当接する。また、第2分割片112及び第3分割片113は第1分割片11を第1方向(図中Y軸方向)に挟むように配置される。
第1補助分割片114及び第2補助分割片115は、図1の成形用芯材1の第4分割片14に後述の拡幅部分114A,115Aを付加したものを、成形用芯材101の中心軸を通る面でY軸方向に2等分したものである。第3補助分割片116及び第4補助分割片117は、図1の成形用芯材1の第5分割片15に後述の拡幅部分116A,117Aを付加したものを同様に2等分したものである。つまり、本実施形態では、第1補助分割片114及び第2補助分割片115が第4分割片に該当し、第3補助分割片116及び第4補助分割片117が第5分割片に該当する。
成形用芯材101の拡径部分102は、図6に示すように、成形用芯材101の全周に亘って、他の部分よりも径が大きくされている。拡幅部分112A,114A,115A,113A,117A,116Aは、複数の分割片の集合状態において、その外周面が滑らかに繋がるように構成されている。
以下に、成形用芯材101の使用方法、すなわち成形用芯材101を用いた成形品の製造方法について説明する。本方法は、成形用芯材101の外周面上に材料を成形する第1工程と、第1工程で成形した成形品から成形用芯材101を引き抜く第2工程とを備える。ここで、第1工程は、図1の成形用芯材1の使用方法における第1工程と同じであるため、説明を省略する。
第2工程は、具体的には、複数のネジ(図示省略)を外す工程と、第1分割片11のみを成形品の中空部から引き抜く工程と、第1分割片11の引き抜き後に第2分割片112及び第3分割片113を成形品の中空部から引き抜く工程と、第2分割片112及び第3分割片113の引き抜き後に、第1補助分割片114、第2補助分割片115、第3補助分割片116、及び第4補助分割片117を成形品の中空部から引き抜く工程と、を有する。
以上詳述した実施形態によれば、以下の効果が得られる。
(2a)拡径部分102により、外径が長手方向に沿って変化する成形品を製造することができる。本実施形態の成形用芯材101で得られる成形品は外径が変化する部分が他の部分と一体に形成されるので、これらの部分を接着して形成した従来品よりも強度等の品質に優れる。
以上、本開示の実施形態について説明したが、本開示は、上記実施形態に限定されることなく、種々の形態を採り得ることは言うまでもない。
Claims (5)
- 長尺かつ中空の成形品を製造するための棒状の成形用芯材であって、
集合することで1つの棒状体を構成する複数の分割片を備え、
前記複数の分割片は、
集合状態で外周面全体が、前記複数の分割片のうち他の複数の分割片に囲まれる棒状の第1分割片と、
前記第1分割片と当接しつつ、前記第1分割片をその長手方向と直交する第1方向に挟むように配置され、前記棒状体の外周面の一部を構成する棒状の第2分割片及び第3分割片と、
前記第1分割片と当接しつつ、前記第1分割片を前記第1方向と直交する第2方向に挟むように配置され、前記棒状体の外周面の一部を構成する棒状の第4分割片及び第5分割片と、
を含む、成形用芯材。 - 請求項1に記載の成形用芯材であって、
前記第1分割片の長手方向と垂直な断面における形状は、長方形、正方形又は円である、成形用芯材。 - 請求項1又は請求項2に記載の成形用芯材であって、
前記第2分割片、前記第3分割片、前記第4分割片、及び前記第5分割片は、前記棒状体の半径方向に挿通された少なくとも1つのネジによって、それぞれ前記第1分割片に固定されている、成形用芯材。 - 請求項1から請求項3のいずれか1項に記載の成形用芯材であって、
前記第1分割片は、長手方向に他の分割片よりも突出した突出部を有する、成形用芯材。 - 請求項1から請求項4のいずれか1項に記載の成形用芯材であって、
前記第2分割片、前記第3分割片、前記第4分割片、及び前記第5分割片のうち少なくとも1つは、長手方向の他の部分よりも前記棒状体の外周面側に拡幅した拡幅部分を有する、成形用芯材。
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Citations (5)
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JPS33184B1 (ja) * | 1955-10-21 | 1958-01-18 | ||
JPS6341131A (ja) * | 1986-08-05 | 1988-02-22 | Hitachi Chem Co Ltd | Frp中空角材の製造法 |
JPH0462143A (ja) * | 1990-06-27 | 1992-02-27 | Yokohama Rubber Co Ltd:The | 繊維強化プラスチック中空角材の成形用マンドレル及び繊維強化プラスチック中空角材の製造方法 |
JP2000117845A (ja) | 1998-10-20 | 2000-04-25 | Nhk Spring Co Ltd | 長尺物成形用中子 |
WO2013069482A1 (ja) * | 2011-11-10 | 2013-05-16 | アイシン精機株式会社 | インテークマニホルドの樹脂成形型、インテークマニホルド及びインテークマニホルドの樹脂成形方法 |
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CN2254016Y (zh) * | 1996-01-12 | 1997-05-14 | 柴志刚 | 粉末成型无缝无锥度组合模具 |
CN105108940A (zh) * | 2015-09-02 | 2015-12-02 | 哈尔滨飞机工业集团有限责任公司 | 一种复合材料成型模 |
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JPS33184B1 (ja) * | 1955-10-21 | 1958-01-18 | ||
JPS6341131A (ja) * | 1986-08-05 | 1988-02-22 | Hitachi Chem Co Ltd | Frp中空角材の製造法 |
JPH0462143A (ja) * | 1990-06-27 | 1992-02-27 | Yokohama Rubber Co Ltd:The | 繊維強化プラスチック中空角材の成形用マンドレル及び繊維強化プラスチック中空角材の製造方法 |
JP2000117845A (ja) | 1998-10-20 | 2000-04-25 | Nhk Spring Co Ltd | 長尺物成形用中子 |
WO2013069482A1 (ja) * | 2011-11-10 | 2013-05-16 | アイシン精機株式会社 | インテークマニホルドの樹脂成形型、インテークマニホルド及びインテークマニホルドの樹脂成形方法 |
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