JP5163105B2 - Resin rotating body and manufacturing method thereof, semi-processed product for resin rotating body molding and manufacturing method thereof, and mold for molding fiber base material for reinforcement - Google Patents

Description

  The present invention relates to a resin rotator and a method for producing the same, and the present invention relates to a resin-made rotator molding half-processed product and a method for producing the same, and the present invention is used in these production methods. The present invention relates to a reinforcing fiber substrate molding die suitable for the above.

  A resin rotator using a reinforcing fiber substrate is excellent in durability and is suitable as a resin rotator such as a resin gear used for vehicle articles, industrial parts and the like. As a reinforcing fiber base material for molding a resin gear, Patent Document 1 discloses a reinforcing fiber base material that is formed into a doughnut shape while turning a tubular body woven or knitted into a tubular shape while turning it over from the end. Have been described. Patent Document 1 also describes a resin gear in which the reinforcing fiber base material is impregnated with resin to form teeth. However, in this conventional technique, in order to improve the bonding strength between the reinforcing fiber base and the stopper provided on the metal bush, two reinforcing fiber bases are placed between the metal bushes in the molding die. In order to prevent the metal bush from coming off, the two layers are stacked (paragraphs [0013] to [0015] of Patent Document 1).

  Patent Document 2 discloses a method for manufacturing a resin gear in which a plurality of paper-making sheet bodies formed by pressing a paper-making sheet mainly composed of a thermosetting resin and a fiber chop are stacked and heated and pressed in a molding die. 2.

  These resin gears have little fiber entanglement at the overlapping interface of the two reinforcing fiber bases or the lamination interface of the paper sheet body, and depending on the intended use, there is a concern that peeling may easily occur on the laminated surface. is there. Further, there is a concern that the bonding strength between the reinforcing fiber base and the metal bush is insufficient. For these reasons, depending on the intended use, there is a concern that the durability of the resin gear is insufficient.

  In order to solve these problems, it has also been proposed to use a fiber chop as the reinforcing fiber to make an aggregate with a paper mold. Patent Document 3 discloses a manufacturing method in which a mixed slurry of a fiber chop and a thermosetting resin is pressurized or dehydrated in a water-permeable mold to obtain an aggregate. However, a resin that can be dispersed in water has low fluidity and insufficient wetting at the interface between the resin and the fiber, so that durability that can withstand practical use cannot be obtained. Further, Patent Document 4 discloses a fiber reinforced resin composite in which a fiber is filled and heated and pressed by a mold having a fluid outlet, and resin injection is also performed by the mold and heated and pressurized. A method of forming a body is disclosed. However, with this method, it is difficult to dispose a metal bush at the center of the resin rotating body. In addition, it is not easy to take out the molded product after the injected resin leaks to the entire molding die composed of a metal mesh etc., and the molding die is clogged, so it can be used repeatedly. There is a problem that disappears.

Conventionally, metal bushes have been made by a rolling method or a method as disclosed in Japanese Utility Model Publication No. 58-69419 (Patent Document 5). However, it is difficult to make a deep undercut in the former, and it is difficult to assign unevenness, and the latter cannot be made into an undercut in only two directions in the thickness direction. It is difficult to grug and it is difficult to achieve sufficient durability.
JP 2001-295913 A JP-A-11-227061 Japanese Patent Laid-Open No. 2001-1413 JP 2005-96173 A Japanese Utility Model Publication No. 58-69419

  In the resin rotating body in which the metal bush is arranged at the center, the metal bush is made up of two ring-shaped reinforcing fiber bases from above and below in order to fill the anti-rotation portion provided on the outer periphery of the metal bush with the reinforcing fiber. A method of sandwiching with a material and filling a fiber with a rotation stopper is a known technique (Patent Document 1). However, in such a method, since there is no entanglement of fibers at the overlapping interface of the reinforcing fiber base material, there is a concern that the durability performance due to interfacial peeling may be lowered depending on the intended use. The problem of interfacial delamination can be solved by using a single reinforcing fiber substrate, but the anti-rotation part provided on the metal bush cannot be sandwiched, so that the fiber is caught in the anti-rotation part. It was not possible to produce a resin rotating body.

  The object of the present invention is to improve the bonding strength between the reinforcing fiber substrate and the detent provided on the outer periphery of the metal bush, even when only one reinforcing fiber substrate is used. An object of the present invention is to provide a highly reliable resin rotating body, a semi-processed product for molding a resin rotating body, and a method for manufacturing the same.

  Moreover, this invention is providing the metal mold | die for reinforcing fiber base materials suitable for the manufacturing method of this invention.

  In order to solve the above problems, the following means are adopted as a result of intensive studies.

  The method for manufacturing a resin rotating body according to the present invention includes a step of preparing a metal bush having one or more anti-rotation portions formed on the outer peripheral portion and rotating about an axis, and an outer position of the outer peripheral portion of the metal bush. A step of forming a reinforcing fiber base disposed in a state of being fitted to the outer periphery, and a step of impregnating the resin into the reinforcing fiber base and curing the resin to form a resin molded body. Yes. In the step of forming the reinforcing fiber base material, a cylindrical reinforcing fiber having a through hole in which the outer peripheral part of the metal bush is fitted in the central part so as not to form a boundary surface inside. Form the body. Next, the reinforcing fiber body is fitted to the outer periphery of the metal bush. Then, the reinforcing fiber body fitted to the outer peripheral portion of the metal bush is compressed in the direction toward the outer peripheral portion of the metal bush and the axial direction of the shaft.

  In this way, in the process of compressing one reinforcing fiber body in the direction toward the outer peripheral part of the metal bush and in the process of compressing in the axial direction, a part of the reinforcing fiber body, that is, the reinforcing fiber, completely prevents the rotation prevention part of the bush. Can be wrapped in. Therefore, as in the prior art, the bonding strength between the reinforcing fiber substrate and the detent portion of the metal bush can be improved without forming a boundary surface of the fiber layer inside the reinforcing fiber substrate.

  As the reinforcing fiber body that does not have a boundary surface inside, a tubular body formed by woven or knitted reinforcing fibers in a tubular shape while turning over from its end is used. Can do.

  Further, the reinforcing fiber body having no boundary surface inside can be composed of a cylindrical reinforcing fiber assembly formed by collecting a large number of reinforcing fibers. This reinforcing fiber assembly is a reinforcing fiber chop while sucking a slurry obtained by dispersing a thinly cut reinforcing fiber chop (reinforcing fiber) in water through a papermaking mold having a plurality of through holes of 10 to 250 mesh. Are stacked to form a plate-like aggregate, and a step of punching a cylindrical reinforcing fiber aggregate from the plate-like aggregate. When a reinforcing fiber assembly is formed by these two steps, a boundary layer that will cause peeling later is not formed inside.

  The cylindrical reinforcing fiber assembly may be formed as follows. That is, it comprises an inner cylinder, an outer cylinder arranged concentrically with the inner cylinder, and a bottom member that connects between the inner cylinder and the lower end of the outer cylinder, and the inner cylinder and the outer cylinder. And a papermaking mold in which a plurality of through holes of 10 mesh or more and 250 mesh or less are formed in at least one member of the bottom member. Then, the reinforcing fiber chop is accumulated on the bottom member while sucking the slurry in which the reinforcing fiber chop is dispersed in water through a papermaking mold to form a cylindrical reinforcing fiber assembly. When the reinforcing fiber assembly is manufactured in this manner, the punching operation is unnecessary, so that the manufacturing process can be reduced and there is no problem that the material to be thrown away increases like punching.

  In the above production method, a slurry in which a reinforcing fiber chop having a short fiber length with an aspect ratio (ratio of fiber length to fiber diameter) of 100 to 1000 is dispersed in water to 0.3 g / liter to 20 g / liter. It is preferable to use it. If the blending ratio is within this range, suction is easy and clogging of the through-holes can be prevented.

  As the reinforcing fiber, various materials can be used. However, the reinforcing fibers include fine fibers obtained by fibrillation of aramid fibers, the fine fibers having a freeness of 100 ml or more and 400 ml or less, and the fine fiber content is 30% by mass or less in the reinforcing fibers. Is preferred. When such a reinforcing fiber is used, compression is easy, and necessary and sufficient bonding strength can be obtained between the reinforcing fiber base and the rotation stopper.

  The anti-rotation part can be composed of a plurality of protrusions protruding from the central part of the metal bush toward the radially outer side of the shaft. A recess is formed between two adjacent protrusions. The protrusions and the recesses are arranged so as to be alternately arranged in the circumferential direction. When the projecting dimension of the projecting part is h1, and the height dimension of the bottom part of the recessed part is h2, h1> h2.

  The number and shape of the one or more anti-rotation portions provided on the outer peripheral portion of the metal bush are arbitrary. For example, the one or more anti-rotation portions can be composed of a plurality of protrusions protruding in the radial direction of the shaft. In this case, the plurality of protrusions and the recesses can be configured such that the protrusion dimension of the protrusions and the height dimension of the bottom part of the recesses are different. And it is preferable to arrange | position a protrusion part and a recessed part so that it may line up by turns in the said circumferential direction. In this case, when the projecting dimension of the projecting part is h1, the height of the bottom part of the recessed part is h2, and h1> h2, the length of the reinforcing fiber chop is 0.5 × h1 mm and 1 ×. It is preferable that the value be greater than the smaller value of h2 mm and less than the larger value of 5 × h1 mm and 10 × h2 mm. When a reinforcing fiber chop having such a length is used, even if the reinforcing fiber enters between adjacent protrusions, no fissure occurs in a part of the reinforcing fiber base, and the reinforcing fiber base It is possible to suppress a decrease in mechanical strength.

  The mold structure used when compressing the reinforcing fiber assembly is arbitrary. For example, a mold structure can be configured from a pair of center pins, a plurality of diameter reducing molds, and a pair of compression molds. The pair of center pins support the metal bush sandwiched from both sides in the axial direction. The plurality of diameter reducing molds are arranged radially outside the metal bush supported by the pair of center pins so as to approach the center pin in order to compress the reinforcing fiber assembly in the direction toward the outer peripheral portion. To work. The pair of compression molds are disposed outside the pair of center pins and operate to relatively approach the axial direction along the pair of center pins in order to compress the reinforcing fiber assembly in the axial direction. When such a mold structure is used, it is preferable to operate a pair of compression molds after operating a plurality of diameter reducing molds. By doing so, it is possible to reliably compress the reinforcing fiber assembly, and it is possible to make a reinforcing fiber base that does not have conspicuous irregularities on the outer surface.

  The resin rotating body manufactured by the manufacturing method of the present invention has one or more anti-rotation portions formed on the outer peripheral portion, a metal bush that rotates around the axis, and a position outside the outer peripheral portion of the metal bush. And a reinforcing fiber base disposed in a state of being fitted to the outer periphery, and a resin molded body formed by impregnating the reinforcing fiber base with resin and curing the resin. In particular, the reinforcing fiber base material is a cylindrical reinforcing fiber having a through hole in which a large number of reinforcing fibers are gathered so as not to form a boundary surface inside, and the outer peripheral part of the metal bush is fitted in the central part. The integrated body is formed by being compressed in the direction toward the outer peripheral portion of the metal bush and the axial direction of the shaft in a state of being fitted to the outer peripheral portion of the metal bush. As a result, there is no boundary surface that causes peeling inside the reinforcing fiber base.

  If considered as a superordinate concept, the reinforcing fiber base molding die has a structure in which a metal bush is arranged in the center in the radial direction, and compresses the reinforcing fiber assembly in the radial direction to an outer diameter of a predetermined length. It has a mold mechanism and a mold mechanism that then compresses in the axial direction to a predetermined thickness.

  As described above, it is preferable to provide one or more detents on the outer periphery of the metal bush. In this case, the detent portion can be constituted by a protruding portion that protrudes outward in the radial direction of the shaft. The thickness dimension measured in the axial direction of the protrusion is preferably smaller than the thickness dimension measured in the axial direction of the metal bush. A plurality of protrusions are preferably provided on the outer periphery of the metal bush at predetermined intervals in the circumferential direction of the shaft. In this way, a part of the reinforcing fiber base is fitted in the recess formed between the two adjacent protruding parts, and the plurality of protruding parts are completely embedded in the reinforcing fiber base. It becomes a state. As a result, the mechanical bond strength between the rotation stopper and the reinforcing fiber base can be sufficiently increased.

  The ratio of the reinforcing fibers to the resin molded body is desirably 30% by volume or more and 50% by volume or less. If it is the value of this range, the mechanical strength required for a resin molding can be obtained reliably.

  If the resin molded body is machined to form a plurality of teeth, it is possible to obtain a gear having high mechanical strength and less noise during use. Of course, rotating parts such as pulleys may be manufactured in addition to gears using the resin rotating body of the present invention.

  In addition, this invention can be grasped | ascertained also as the product of the state before impregnating resin to the reinforcing fiber base material, ie, the semi-finished product for resin-made rotary body formation, and its manufacturing method. This is because the impregnation of the resin is often performed in a specialized factory, and may be distributed in the market in the state of a semi-processed product for molding a resin rotating body. The method for manufacturing the resin-made rotating body half-processed product is the same as the method for manufacturing the resin-made rotating body described above, except that the resin impregnation / curing step is not executed.

  Moreover, what was manufactured by the sintering method can be used for metal bushes. Further, the protrusion used as the rotation stopper has an undercut shape in which the thickness of the top measured along the axial direction is larger than the thickness of the base, and a cross section of a pair of side surfaces facing the axial direction of the metal bush The angle with respect to is preferably 5 ° or more and 40 ° or less.

  In the reinforcing fiber base material according to an example of the present invention, a large number of detents protrude radially from the outer peripheral surface of the metal bush, and the detent thickness is smaller than the thickness of the metal bush, and can be formed between adjacent detents. Reinforcing fibers are also biting into the anti-rotation recess. For this reason, the bonding strength between the reinforcing fiber base and the detent provided on the metal bush is high. Further, since the reinforcing fiber base material is not overlapped in the molding die, there is no overlapping interface of the reinforcing fiber base material, and no peeling occurs. From these things, the durable performance of resin-made rotary bodies, such as a resin gear, can be improved significantly.

  According to the present invention, in the process of compressing in the direction toward the outer peripheral portion of the metal bush and the process of compressing in the axial direction one reinforcing fiber body that does not have a boundary surface inside, by a part of the reinforcing fiber body, Since the detent portion of the metal bush can be completely wrapped, the reinforcing fiber base and the metal bush can be formed without forming the boundary surface of the fiber layer inside the reinforcing fiber base as in the prior art. The coupling strength with the rotation preventing portion can be improved, and an advantage that the durability performance of a resin rotating body such as a resin gear can be greatly improved is obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of an example of an embodiment of a resin rotating body of the present invention schematically shown. 2A is a plan view of the metal bush 2, and FIG. 2B is a longitudinal sectional view of FIG. 2A. The resin rotating body 1 includes a metal bush 2 that rotates about a shaft (not shown). A through hole 3 into which a shaft (not shown) is fitted is formed at the center of the metal bush 2. Further, on the outer peripheral portion of the metal bush 2, projecting portions 4A constituting a plurality of detent portions are integrally formed with a predetermined interval in the circumferential direction. In FIG. 2A, for easy understanding, the central portion 2A and the outer peripheral portion 2B of the metal bush 2 are hatched differently, but the metal bush 2 is an integrally molded product. A shaft (not shown) may be integrally formed with the metal bush 2. The thickness dimension L2 measured in the axial direction of the plurality of protrusions 4A is smaller than the thickness dimension L1 measured in the axial direction of the central portion 2A of the metal bush 2. The metal bush 2 used in the present embodiment is manufactured by a sintering method. And the protrusion part 4A which comprises a rotation prevention part is an undercut shape with a thick top part and a thin base part. In addition, the metal bush 2 is used in which the angle θ between the virtual center cross section PS and the side surface SF is 5 ° or more and 40 ° or less. Then, as shown in FIG. 2, in order to enhance the action of the anti-rotation portion that can withstand the load in the rotation direction, the protrusion 4 </ b> A serving as the anti-rotation portion has a height h <b> 1 measured from the central portion 2 </ b> A of the metal bush 2. It is the required length. Moreover, the height h2 measured from the central portion 2A of the recess 4B formed between the two adjacent protrusions 4A is lower than the aforementioned height h1. When the protrusion 4A and the recess 4B having such an undercut shape and having an angle θ of 5 ° or more and 40 ° or less are used, a detent portion is provided in the reinforcing fiber base 5 clearly shown in FIG. As a result, the plurality of protrusions 4A and the plurality of recesses 4B are completely filled. As a result, the strength of the mechanical bond between the reinforcing fiber base 5 and the metal bush 2 can be made sufficient. Note that the mechanical strength described above naturally increases when a part of the reinforcing fiber substrate 5 enters the recess 4B formed between the two adjacent protrusions 4A. In FIG. 1, the reinforcing fiber base 5 is simply shown by hatching extending in the lateral direction.

  In the present embodiment, one reinforcing fiber substrate 5 is disposed at a position outside the outer peripheral portion of the metal bush 2 in a state of being fitted to the outer peripheral portion. The reinforcing fiber base material 5 is impregnated with a resin, and the resin is cured to form a resin molded body 6. As schematically shown in FIG. 3, the reinforcing fiber base 5 is a cylindrical reinforcement having a through hole 7 in which a large number of reinforcing fibers are gathered and the outer periphery of the metal bush 2 is fitted in the center. The fiber assembly 8 is compressed in the direction toward the outer periphery of the metal bush 2 (the metal bush or the radially inner side of the shaft) and the axial direction of the shaft in a state where the fiber assembly 8 is fitted to the outer periphery of the metal bush 2. Is formed. In the present embodiment, the reinforcing fiber assembly 8 constitutes a reinforcing fiber body.

  As described later, various types of reinforcing fibers can be used for forming the reinforcing fiber substrate 5 or the reinforcing fiber assembly 8. The length of the reinforcing fiber is determined as follows when, for example, a metal bush 2 as shown in FIG. 2 is used. That is, the length of the reinforcing fiber when the maximum height (projection dimension in the radial direction) of the protrusion 4A is h1, and the minimum height or bottom height (protrusion dimension in the radial direction) of the recess 4B is h2. Is more than the smaller value of 0.5 × h1 mm and 1 × h2 mm, and preferably less than the larger value of 5 × h1 mm and 10 × h2 mm. Here, when the protrusion dimensions h1 and h2 are the same, the effect of rotation prevention becomes weak. For the protrusion dimension h1 or h2 at the bottom of the protrusion 4A or the recess 4B, a fiber length sufficient to cover the reinforcing fiber is necessary, and the length of the reinforcing fiber is 0.5 × h1 mm and 1 ×. It is appropriate that it is not less than the smaller value of h2 mm. Further, if the reinforcing fiber is too long, it causes a hindrance to uniform dispersion, resulting in a non-uniform fiber distribution that does not contribute to strength enhancement. Therefore, the length of the reinforcing fiber is suitably less than the larger value of 5 × h1 mm and 10 × h2 mm. Of course, as the protrusion 4A, a protrusion having a protrusion dimension h3 larger than h1 and h2 (a protrusion having three or more different protrusion dimensions) may be used in combination.

  Further, in order to strengthen the coupling between the rotation stopper provided on the outer peripheral portion of the metal bush 2 and the resin portion, the thickness dimension L2 of the top portion measured along the axial direction is the thickness dimension of the base portion. The angle θ with respect to the central virtual cross section PS of the pair of side surfaces SF facing in the axial direction of the metal bush 2 is greater than or equal to 5 ° and less than or equal to 40 °, preferably greater than or equal to 10 ° and greater than 35 °. Some are effective. This acts to prevent removal in the outer diameter direction.

  The metal bush 2 provided with the protruding portion 4A and the recessed portion 4B constituting the rotation preventing portion having the undercut shape can be accurately manufactured as designed if it is molded by a sintering method. For example, in the case of a resin gear having an outer diameter of 60 mm, the optimum structure of the protrusion 4 is 30 protrusions (crests) and 29 recesses or valleys formed between the protrusions. Of course, these numbers are appropriately changed according to the diameter and thickness of the resin gear and the tooth structure.

  In order to obtain the cylindrical reinforcing fiber assembly 8, it is preferable to use a papermaking mold 9 as shown in FIG. The papermaking mold 9 includes an inner cylinder 10, an outer cylinder 11 concentrically arranged with the inner cylinder 10, and a bottom member that connects between the inner cylinder 10 and the lower end of the outer cylinder 11. 12, and a plurality of through holes of 10 mesh or more and 250 mesh or less are formed in at least one member of the inner cylinder body 10, the outer cylinder body 11, and the bottom member 12. In this example, a plurality of through holes of 10 mesh or more and 250 mesh or less are formed in all of the inner cylinder body 10, the outer cylinder body 11, and the bottom member 12. In addition, the specific inner cylinder body 10, the outer cylinder body 11, and the bottom member 12 are comprised with the wire mesh which has drainage. The outer diameter of the inner cylindrical body 10 of the papermaking mold 9 is the same as or preferably larger than the outer diameter including the protrusion 4 of the metal bush 2 to be used. When the inner diameter of the obtained cylindrical reinforcing fiber assembly 8 is smaller than the outer diameter of the metal bush 2, the metal bush 2 can be arranged at the center position in the radial direction and thickness direction of the reinforcing fiber assembly 8. Can not. Alternatively, because the fibers of the inner diameter portion of the cylindrical reinforcing fiber assembly 8 are caught by the protrusions 4 for preventing rotation provided on the outer peripheral portion of the metal bush 2, the shape of the cylindrical reinforcing fiber assembly 8 collapses. It is. The papermaking mold 9 is set and used in a case 13 that is sucked into a negative pressure by the pump P.

  When the mesh size of the metal mesh (structure with through-holes) used for the members constituting the papermaking mold 9 becomes larger than 250 mesh, the filtration resistance of water and fibers increases, and the reinforcement put inside the papermaking mold 9 Even if the slurry containing the fibers is sucked by the pump P and the water is drained from the papermaking mold 9, the time required for separating the fibers and water becomes long, and the manufacturing cycle becomes long. On the other hand, if the mesh size is smaller than 10 mesh, even if reinforcing fibers having a long fiber length are used, most of the reinforcing fibers flow out together with water because the mesh gaps (through holes) are large. Therefore, there arises a problem that the fiber density of the reinforcing fiber assembly 8 is remarkably lowered. Therefore, the mesh size used is preferably 10 mesh or more and 250 mesh or less.

  The reinforcing fiber chop used is preferably made of fibers having a melting point or decomposition temperature of 250 ° C. or higher. By forming the reinforcing fiber assembly 8 using such a reinforcing fiber chop, the reinforcing fiber chop in the resin rotating body is thermally deteriorated at a molding temperature and a processing temperature at the time of molding, and an atmospheric temperature at the time of actual use. It can be set as the resin rotary body excellent in heat resistance, without raising. Such fibers include para-aramid fibers, meta-aramid fibers, carbon fibers, glass fibers, boron fibers, ceramic fibers, ultra-high strength polyethylene fibers, polyketone fibers, polyparaphenylene benzobisoxazole fibers, wholly aromatic polyesters. It is preferable to use at least one fiber selected from fibers, polyimide fibers, and polyvinyl alcohol fibers.

  The reinforcing fiber chop preferably contains at least 20% by volume of high-strength and high-modulus fiber having a tensile strength of 15 cN / dtex or more and a tensile modulus of 350 cN / dtex or more. The resin rotating body using the reinforcing fiber assembly 8 thus obtained can withstand a high load applied during use.

  When the aspect ratio (fiber length / fiber diameter) of the reinforcing fiber chop is smaller than 100, the entanglement between the fibers is insufficient, and the reinforcing fiber chop wraps around the rotation-preventing recess formed between the adjacent protrusions 4 of the metal bush 2. The effect is reduced and the function as a reinforcing fiber cannot be satisfied. On the other hand, if the aspect ratio is greater than 1000, the fiber length is too long, resulting in poor fiber dispersion, resulting in difficulty in obtaining strength. Therefore, the aspect ratio that satisfactorily satisfies the entanglement, wraparound and dispersibility between the fibers is preferably 100 to 1000, more preferably 100 to 500.

  Further, in order to give strength for maintaining the shape when moving or transporting the reinforcing fiber substrate 5 after the paper making and integration with the metal bush to the next process, the reinforcing fiber is an aramid fiber. It is desirable to blend so that the fine fiber freeness is 100 ml or more and 400 ml or less, and the fine fiber content is 30% by mass or less in the reinforcing fiber. As a desirable mode, it is preferable to mix fibrillated aramid fine fibers which are cleaved in the fiber axis direction by mechanical shearing of para-aramid fibers. If the freeness exceeds 400 ml, fibrillation is insufficient and it becomes difficult to impart strength to maintain the shape of the reinforcing fiber substrate. Further, when the freeness is less than 100 ml, not only the fiber axis direction is cleaved but also the powder is crushed in the radial direction and the entanglement of the fibers deteriorates, and the shape of the reinforcing fiber base is maintained. Therefore, it becomes difficult to provide the strength. Further, the drainage is deteriorated, which impedes resin impregnation. When the fibrillated aramid fine fibers exceed 30% by mass, the fibrillated fine fibers are filled in the gaps between the fibers, and the resin impregnation of the resin is hindered during resin injection molding, resulting in defects such as poor impregnation. End up. Preferably, 5 to 10% by mass of fibrillated fine fibers which give appropriate strength and do not impair resin impregnation properties are blended.

  The concentration when the reinforcing fiber chop is dispersed in water is preferably 0.3 g / liter to 20 g / liter. When fibers having a short fiber length are used, there is little entanglement between the fibers and good dispersion makes it possible to disperse with a high concentration slurry having a concentration of 20 g / liter. On the other hand, when a fiber having a long fiber length is used, the fiber length is too long and cannot be sufficiently dispersed unless the concentration is as low as 0.3 g / liter.

  Incidentally, in the case where the above-mentioned reinforcing fibers include fine fibers obtained by fibrillating aramid fibers, the thickness dimension (axial dimension) of the reinforcing fiber assembly 8 used when the diameter of the metal bush 2 is 5 cm is about 8 cm. The reinforcing fiber assembly 8 is compressed to about 1.5 cm and formed into the reinforcing fiber base 5 by a compression operation described later.

  Next, an example of a method for producing a resin-made rotating body half-processed product provided with the reinforcing fiber substrate 5 by compressing the reinforcing fiber assembly 8 will be described with reference to FIG. FIG. 5A is a cross-sectional view showing the reinforcing fiber base molding die used in a state cut in the transverse direction, and FIGS. 5B to 5E show the reinforcing fiber base molding die vertically. It is sectional drawing shown in the state cut | disconnected in the direction. The reinforcing fiber base molding die includes, for example, a pair of center pins 15 and 16, four diameter-reducing dies 17 to 20, and a pair of compression dies 21 and 22. The pair of center pins 15 and 16 support the metal bush 2 sandwiched from both sides in the axial direction. In this example, the lower center pin 16 is in a fixed state, and the metal bush 2 is disposed on the center pin 16. Then, the upper center pin 15 moves toward the lower center pin 16 so that the metal bush 2 is sandwiched between the pair of center pins 15 and 16 [FIG. 5C]. The four diameter-reducing molds 17 to 20 are driven by a driving mechanism (not shown) and move in directions toward and away from the center pins 15 and 16. That is, the four diameter-reducing molds 17 to 20 are arranged on the outer side in the radial direction of the metal bush 2 supported by the pair of center pins 15 and 16, and the reinforcing fiber assembly 8 is disposed on the outer periphery of the metal bush 2. It operates so as to approach toward the center pins 15 and 16 in order to compress in the direction to go [FIG. 5 (D)]. The pair of compression molds 21 and 22 are arranged on the outside of the pair of center pins 15 and 16, respectively, and are axially extended along the pair of center pins 15 and 16 in order to compress the reinforcing fiber assembly 8 in the axial direction. An operation of relatively approaching the direction is performed [FIG. 5E]. In the case of using such a mold structure, it is preferable to operate the pair of compression molds 21 and 22 after operating the four diameter-reducing molds 17 to 20. In this way, the reinforcing fiber assembly 8 can be reliably compressed, and the reinforcing fiber base 5 can be made without any concavity and convexity formed on the outer surface.

  When the reinforcing fiber base 5 is formed, the reinforcing fiber base 5 may be formed by heating the mold. This is preferable because the shape of the reinforcing fiber base 5 after molding is maintained.

  Next, a process of manufacturing the reinforcing fiber base 5 using the reinforcing fiber base molding die will be described. First, in FIG. 5B, after the metal bush 2 is disposed on the lower center pin 16, the integrated reinforcing fiber assembly 8 is disposed on the lower compression mold 22. To do. Next, in FIG. 5C, the upper center pin 15 is lowered. In FIG. 5D, the diameter-reducing dies 17 to 20 are moved toward the radial center, and the reinforcing fiber assembly 8 is compressed in the radial direction to an outer diameter of a predetermined length. Here, in this example, the diameter reducing molds 17 to 20 are described in four divisions, but the number of divisions of the diameter reducing molds 17 to 20 is not particularly limited. Further, the opposing diameter-reducing molds 17 to 20 may be moved at the same time or may be moved with a time difference.

  5E, the upper compression mold 21 is lowered and the lower compression mold 22 is raised to compress the reinforcing fiber assembly 8 in the axial direction to a predetermined thickness. Thereby, the reinforcing fiber base material 5 is integrated with the protruding portion 4 as a retaining portion provided on the metal bush 2. The reinforcing fiber base 5 formed in this manner is dried as necessary to obtain a resin-made rotating body half-processed product.

  The reinforcing fiber assembly 8 is formed by collecting fiber chops while sucking through a papermaking mold 25 having a plurality of through holes of 10 mesh or more and 250 mesh or less to form a plate-like assembly 26. The tubular reinforcing fiber assembly 8 may be formed by punching (pressing out) from the assembly 26. In the case of manufacturing the reinforcing fiber assembly 8 by pressing the plate-like assembly 26, the reinforcing fiber assembly 8 can be manufactured as follows, for example. In FIG. 6A, the papermaking mold 25 includes a bottom surface portion 25A and a rectangular side surface portion 25B, and the bottom surface portion 25A is formed of a wire mesh. First, a fiber chop is put into a tank filled with water, and stirred with a stirrer to be dispersed. Then, the slurry containing the reinforcing fiber chop dispersed in water in the tank is introduced into the papermaking mold 25, and the fiber chop is accumulated in a sheet form. The accumulation 26 ′ is pressurized and compressed to a predetermined thickness, and then dried to obtain a plate-like accumulation 26. In FIG. 6 (B), this is punched into a predetermined shape to obtain a reinforcing fiber assembly 8.

  Next, as shown in FIG. 7, after the resin-made rotating body molding half-finished product HP provided with the reinforcing fiber base 5 is placed in the mold, a liquid resin is injected into the mold 27 and the reinforcing fiber base is injected. 5 is impregnated and cured to form a resin rotating body provided with a resin molded body. A gear can be obtained by forming the teeth by machining the outer peripheral portion of the resin molded body of the molded resin rotating body. If a groove is formed along the outer peripheral surface, a pulley can be obtained.

  The liquid resin may be any of thermosetting resin, thermoplastic resin, and the like, epoxy resin, polyaminoamide resin, phenol resin, unsaturated polyester resin, polyimide resin, polyethersulfone resin, polyetheretherketone resin, A combination of at least one resin selected from polyamideimide resin, polyamide resin, polyester resin, polyphenylene sulfide resin, polyethylene resin, and polypropylene resin and a curing agent for the resin can be used.

  Among these, a polyaminoamide resin is preferable from the viewpoint of strength and heat resistance of the cured resin, 2,2 ′-(1,3-phenylene) bis-2-oxazoline and amine curing agent having excellent heat resistance and strength, and the above-mentioned It is preferable to use a resin composed of 5 parts by mass or less of the catalyst with respect to 100 parts by mass of the mixture. When the catalyst is added in an amount of 5 parts by mass or more, the curing time is shortened, so that the resin is cured before the reinforcing fiber base is sufficiently impregnated with the resin, which causes a problem of poor resin impregnation.

  The ratio of the reinforcing fiber contained in the resin rotating body varies depending on the desired strength of the resin rotating body, but is preferably 30% by volume or more and 50% by volume or less. When the proportion of the reinforcing fiber in the resin rotating body is less than 30% by volume, the effect of reinforcing the resin with the reinforcing fiber is hardly seen, and the reinforcing fiber to the detent (4A, 4B) of the metal bush 2 Insufficient filling. Further, when the proportion of the reinforcing fibers exceeds 50% by volume, the proportion of the reinforcing fibers is too high, which causes problems such as insufficient resin impregnation during resin injection molding. Therefore, the strength of the reinforcing fiber is sufficient for the proportion of the reinforcing fiber, and the reinforcing fiber is surely filled in the recess 4B for rotation prevention formed between the two protruding portions 4A, and the resin is impregnated. More preferably, it is 35 to 45% by volume which does not inhibit the above.

  Examples of the present invention will be described below.

Example 1
In order to produce the slurry, a tank filled with water in an amount that gives a concentration of 1 g / liter when the fiber chop is charged is prepared. And in this tank, the reinforcement fiber of the quantity from which the fiber total amount of the reinforcement fiber in a resin molding becomes 40 volume% is put. Specifically, as a fiber chop used as a reinforcing fiber, a para-aramid fiber having a 200 aspect ratio “Technola (trademark)” manufactured by Teijin Limited and a fine fiber “DuPont” fibrillated until the freeness value becomes 300 ml. “Kevlar (trademark)” manufactured by Co., Ltd. is introduced into the tanks in an amount of 95: 5, and the water in the tank is stirred with a stirrer to disperse the fiber chops. In the case of using a mold, the cavity S in the case 13 is depressurized to 80 kPa or less by a pump P for pressure reduction, and the papermaking mold 9 is filled with slurry containing dispersed fiber chops, The fiber chop and water are separated to obtain a cylindrical reinforcing fiber assembly 8. A 70 mesh wire mesh was used as the wire mesh constituting the papermaking mold.

  Next, using the mold shown in FIG. 5, the metal bush 2 is disposed on the lower center pin 16 of the mold center, and then the cylindrical reinforcing fiber assembly 8 is replaced with the lower compression mold. Place on the mold 22. The shape of the protrusion 4A and the recess 4B of the metal bush 2 to be used is h1 = 2 mm, h2 = 0.5 mm, an undercut shape, and the virtual center cross section PS of the metal bush 2 and the side surface SF The angle θ between them is 20 °. Then, the metal bush 2 is sandwiched between the lower center pin 16 and the upper center pin 15. Thereafter, the reinforcing fiber assembly 8 is radially compressed to a predetermined outer diameter by the diameter reducing molds 17 to 20, and then the reinforcing fiber assembly 8 is axially reduced to a predetermined thickness by the pair of compression molds 21 and 22. Compress in the direction. Thereby, the cylindrical reinforcing fiber assembly 8 is integrated with the protruding portion 4 </ b> A provided on the metal bush 2. This is dried to obtain the reinforcing fiber substrate 5.

  Next, as shown in FIG. 7, the reinforcing fiber base 5 integrated with the metal bush 2 obtained in the above process is placed in a molding die 27 heated to 200 ° C. and clamped. Then, after reducing the pressure inside the molding die 27 to 90 kPa or less, 68.6 parts by mass of 1,3-PBO (manufactured by Mikuni Pharmaceutical Co., Ltd.), 31.4 parts by mass of MDA (manufactured by Mitsui Chemicals, Inc.) Is added at a temperature of 140 ° C., 1 part by mass of octyl bromide is added, and the agitated resin is injected into the mold 27 to impregnate the reinforcing fiber base 5 and heat-cured in the mold 27. Get the gear material. A resin gear is obtained by forming teeth by cutting this gear material.

Example 2
In Example 1, as a fiber chop, a para-aramid fiber having an aspect ratio of 200 “Technola (trademark)” manufactured by Teijin Limited was 50% by mass, and a meta-aramid fiber having an aspect ratio of 200 manufactured by Teijin Limited. 45% by mass of “Conex (trademark)” and 5% by weight of “Kevlar (trademark)” manufactured by DuPont Co., Ltd., which are fibrillated to a freeness value of 300 ml, are used. Is the same as in Example 1 to obtain a resin gear.

Example 3
In Example 1, except that the blending ratio of the fine fiber “Kevlar (trademark)” manufactured by DuPont Co., Ltd. was fibrillated to a freeness value of 300 ml was 0% by mass. Get.

Example 4
In Example 1, except that the blending ratio of the fine fiber “Kevlar (trademark)” manufactured by DuPont Co., Ltd. was fibrillated to a freeness value of 300 ml was 30% by mass. Get.

Example 5
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that the total amount of reinforcing fibers relative to the resin molded body is 20% by volume.

Example 6
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that the total amount of reinforcing fibers relative to the resin molded body is 30% by volume.

Example 7
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that the total amount of reinforcing fibers relative to the resin molded body is 50% by volume.

Example 8
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that a fiber chop having an aspect ratio of 40 is used.

Example 9
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that a fiber chop having an aspect ratio of 100 is used.

Example 10
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that a fiber chop having an aspect ratio of 800 is used.

Example 11
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that a fiber chop having an aspect ratio of 1200 is used.

Example 12
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that a fine fiber “Kevlar (trademark)” manufactured by DuPont Co., Ltd., fibrillated to a freeness value of 150 ml is used.

Example 13
In Example 1, a resin gear is obtained in the same manner as in Example 1 except that the fine fiber “Kevlar (trademark)” manufactured by DuPont Co., Ltd., fibrillated to a freeness value of 350 ml is used.

Example 14
A resin gear is obtained in the same manner as in Example 1 except that a straight metal bushing in which the protrusion 4 on the outer peripheral surface of the metal bushing 2 is not undercut is used.

Comparative Example 1
A circular knitted tubular body knitted with a mixed yarn of para-aramid fiber and meta-aramid fiber (para-aramid fiber blend amount: 45% by mass) is prepared. This cylindrical body is wound up from the end in the axial direction and arranged in a ring shape. Further, as shown in FIG. 8, two reinforcing fiber bases 8 ′ press-molded with a mold so that the cross section is rectangular are used. The projecting portion 4A provided on the metal bush 2 is sandwiched between two reinforcing fiber bases 8 ', and placed in a heated molding die 41 for clamping. Subsequent steps are performed in the same manner as in Example 1 to manufacture the resin gear 51. This comparative example is manufactured by the method described in Patent Document 1.

Comparative Example 2
A resin gear is obtained in the same manner as in Comparative Example 1 except that a straight metal bushing in which the protrusion 4 on the outer peripheral surface of the metal bushing 2 is not undercut is used.

Comparative Example 3
A plate-like assembly was prepared using the papermaking mold 25 shown in FIG. In the papermaking mold 25, only the bottom surface portion 25A is formed of a wire mesh, and the wire mesh is a # 70 sheet-like mesh. A fiber chop dispersed in water in the tank 21 with the same fiber composition and concentration as in Example 1 is introduced into the papermaking mold 25 and dewatered to obtain an aggregate 26 'having a thickness of 20 to 30 mm. After the accumulation 26 'is dried, it is punched into a ring shape having an outer diameter of φ80 mm and an inner diameter of φ55 mm to obtain a cylindrical reinforcing fiber assembly 8. When producing a resin rotating body, two reinforcing fiber assemblies 8 are used. In addition, the input amount of the reinforcing fiber is calculated so that the volume of the reinforcing fiber with respect to the resin molded body when the resin rotating body is formed using the reinforcing fiber assembly 8 is 40% by volume.

  Two reinforcing fiber assemblies 8 obtained in the above process are used, and as shown in FIG. 8, a protrusion 4A provided on the metal bush 2 is sandwiched and placed in a heated molding die 41. Tighten. Subsequent steps are performed in the same manner as in Example 1 to produce a resin gear.

Comparative Example 4
A resin gear is obtained in the same manner as in Comparative Example 3 except that a straight metal bush is used in which the protrusion 4 on the outer peripheral surface of the metal bush 2 is not undercut.

  Table 2 shows the results of measuring the torsional strength, boss punching strength, and motoring durability life using the resin gears produced by the methods shown in Examples 1 to 16 and Comparative Examples 1 to 4. The measuring method is as follows.

  Torsional strength: The resin gear 51 manufactured in the above embodiment and the comparative example is meshed with the steel gear 52 fixed as shown in FIG. A load was applied to the arm 54 having a length L attached to the shaft of the resin gear 51, and the maximum load that caused the resin gear 51 to break was measured. The torsional strength was calculated from this measured value and the following formula.

Torsional strength (N) = fracture load (N) x [arm length L (mm) / gear reference pitch circle radius mm]]
Boss pull-out strength: As shown in FIG. 10, the resin gear 51 is arranged on a cylindrical base 55 which is in contact with only the resin portion and has an inner diameter larger than the outer diameter size of the metal bush 2. A metal fitting 56 for holding the metal bush 2 from above is mounted on the metal bush 2 and a load is applied to the metal fitting 56 to measure the maximum load that causes the resin gear 51 to break.

Motoring durability life: The resin gear 51 was continuously rotated under the test conditions shown in Table 1, and the time until the resin gear 51 was broken was measured.

Effect of fiber filling in undercut:
As is clear from the results of Example 1, Comparative Example 1, and Comparative Example 3, when the undercut portion is forcibly filled with fiber as in Example 1 of the present invention, the boss punching strength is improved.

  Effect of presence / absence of substrate interface: As is clear from the results of Example 1 and Comparative Example 2, the reinforcing fiber substrate is made into one ring as in Example 1 of the present invention. As a result, the motoring durability life is improved.

Effect of fine fiber content after fibrillation:
From the results of Examples 1, 3, and 4, it can be seen that there is no influence due to the difference in the fine fiber content. Further, if the content of fine fibers subjected to fibrillation exceeds 30% by weight, resin impregnation failure occurs during resin molding. Therefore, the fine fiber is preferably 30% by weight or less.

Effect of reinforcing fiber filling rate:
From the results of Example 1 and Examples 5 to 7, the fiber filling amount is preferably 30 to 50% by volume. If the fiber filling amount exceeds 50% by volume, a resin impregnation defect occurs during resin molding.

Aspect ratio effect:
From the results of Example 1 and Examples 8 to 11, it can be seen that the aspect ratio is preferably 100 to 1000.

Effect of fine fiber freeness value:
From the results of Example 1, Examples 12 and 13, it can be seen that there is no influence due to the freeness value of the fine fibers.

Effect of presence or absence of undercut:
From the results of Example 1, Example 14, Comparative Example 2, and Comparative Example 4, it can be seen that torsional strength and motoring durability life are improved by applying an undercut.

  In the above embodiment, a cylindrical reinforcing fiber body that is formed of a large number of reinforcing fibers so as not to form a boundary surface inside and that has a through hole into which the outer peripheral portion of the metal bush fits at the center portion is used as the reinforcing fiber. It was formed from an aggregate. However, as a reinforcing fiber body that does not have a boundary surface inside, as shown in FIG. 11, a tubular body 100 formed by woven or knitted reinforcing fibers is turned upside down from its end portion. The reinforcing fiber body 101 formed in a donut shape can be used. Even when such a reinforcing fiber body 101 is used, the reinforcing fiber body 101 is fitted to the outer peripheral portion of the metal bush 2 as in the above-described embodiment. Then, the reinforcing fiber body 101 fitted to the outer periphery of the metal bush is compressed in the direction toward the outer periphery of the metal bush and the axial direction of the shaft. In this way, in the process of compressing one reinforcing fiber body 101 in the direction toward the outer peripheral part of the metal bush and in the process of compressing in the axial direction, a part of the reinforcing fiber body, that is, the reinforcing fiber prevents the bushing detent part. Can be completely packaged. Therefore, as in the prior art, the bonding strength between the reinforcing fiber substrate and the detent portion of the metal bush can be improved without forming a boundary surface of the fiber layer inside the reinforcing fiber substrate.

It is the longitudinal cross-sectional view of an example of embodiment of the resin-made rotary body of this invention typically shown. (A) And (B) is the top view and longitudinal cross-sectional view of metal bushes. It is the schematic of a reinforcement fiber assembly. It is the schematic which shows the papermaking metal mold | die used for manufacture of a reinforced fiber assembly. (A) thru | or (E) is a figure which shows the formation process of the fiber base material for a reinforcement in order. (A) And (B) is a figure which shows the example of the papermaking metal mold | die which manufactures a plate-shaped integration body, and the example which manufactures a reinforcement fiber integration body from a plate-shaped integration body. It is explanatory drawing which shows the state which has arrange | positioned the resin-made rotary body shaping | molding semi-finished product to the metal mold | die for resin injection | pouring. It is a figure used in order to demonstrate the example in the case of manufacturing the resin-made rotary body of a comparative example. It is a figure which shows the structure of the apparatus which measures torsional strength. It is a figure which shows the structure of the apparatus which measures the boss punch strength. It is a figure which shows the process of forming a reinforced fiber body from the cylindrical body formed by the woven or knitted reinforcement fiber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin rotator 2 Metal bush 3 Through-hole 4A Protrusion part (anti-rotation part)
5 Reinforcing fiber substrate 8 Reinforcing fiber assembly (reinforcing fiber body)

Claims (24)

A reinforcing fiber substrate having one or more anti-rotation portions on the outer peripheral portion and arranged in a state of being fitted to the outer peripheral portion at a position outside the outer peripheral portion of the metal bush that rotates about an axis. Forming step;
A step of impregnating the reinforcing fiber substrate with a resin, and curing the resin to form a resin molded body, comprising:
Forming the reinforcing fiber substrate comprises:
Forming a cylindrical reinforcing fiber assembly comprising a through hole in which a large number of reinforcing fibers are gathered so as not to form a boundary surface inside and the outer peripheral portion of the metal bush fits in a central portion;
Fitting the reinforcing fiber assembly to the outer periphery of the metal bush;
A resin comprising: a step of compressing the reinforcing fiber assembly fitted to the outer peripheral portion of the metal bush in a direction toward the outer peripheral portion of the metal bush and an axial direction of the shaft. A manufacturing method of a rotating body. The step of forming the cylindrical reinforcing fiber assembly includes the step of sucking the slurry in which the reinforcing fiber chop is dispersed in water through a papermaking mold having a plurality of through holes of 10 mesh or more and 250 mesh or less. Stacking to form a plate-like aggregate;
The method for manufacturing a resin rotating body according to claim 1, comprising: punching out the cylindrical reinforcing fiber assembly from the plate-like assembly. The step of forming the cylindrical reinforcing fiber assembly includes
An inner cylinder, an outer cylinder disposed concentrically with the inner cylinder, and a bottom member connecting between the inner cylinder and a lower end of the outer cylinder, the inner cylinder, Preparing a papermaking mold in which a plurality of through holes of 10 mesh or more and 250 mesh or less are formed in at least one member of the outer cylindrical body and the bottom member;
2. The step of collecting the reinforcing fiber chops on the bottom member while sucking the slurry in which the reinforcing fiber chops are dispersed in water through the papermaking mold to form the cylindrical reinforcing fiber assembly. The manufacturing method of the resin-made rotary body of description.   2. The slurry according to claim 1, wherein the reinforcing fiber chop having an aspect ratio (ratio of fiber length to fiber diameter) of 100 to 1000 is dispersed in water to 0.3 g / liter or more and 20 g / liter or less. The manufacturing method of the resin-made rotary body of 2.   The reinforcing fibers include fine fibers obtained by fibrillation treatment of aramid fibers, the freeness of the fine fibers is 100 ml or more and 400 ml or less, and the content of the fine fibers is 30% by mass or less in the reinforcing fibers. The manufacturing method of the resin-made rotary body of Claim 3 characterized by the above-mentioned. One or more detents are formed on the outer periphery of the metal bush,
The one or more detents include a plurality of protrusions protruding in the radial direction of the shaft,
The protrusion has an undercut shape in which the thickness of the top measured along the axial direction is larger than the thickness of the base, and the virtual bush of the metal bush on the side of the protrusion facing the axial direction. 6. The method for manufacturing a resin rotating body according to claim 1, wherein an angle θ with respect to the central cross section is not less than 5 ° and not more than 40 °. The one or more anti-rotation portions comprise a plurality of protrusions protruding in the radial direction of the shaft from a central portion of the metal bush,
A recess is formed between two adjacent protrusions,
The protrusions and the recesses are arranged to be alternately arranged in the circumferential direction of the shaft ,
When h1 is a projecting dimension of the projecting part from the central part and h2 is a height dimension of the bottom of the recess from the central part, when h1> h2,
2. The length of the reinforcing fiber chop is not less than the smaller value of 0.5 × h1 mm and 1 × h2 mm and not more than the larger value of 5 × h1 mm and 10 × h2 mm. or method for producing a resin-made rotary body according to 2. In the step of compressing, the reinforcing bushes are disposed on a radially outer side of the metal bush supported by the pair of center pins and a pair of center pins that sandwich the metal bush from both sides in the axial direction. A plurality of diameter-reducing molds operating toward the center pins to compress the body in the direction toward the outer peripheral portion; and the reinforcing fiber assembly disposed outside the pair of center pins. In order to compress in the axial direction, using a pair of compression molds that move relatively closer to the axial direction along the pair of center pins,
The method for manufacturing a resin rotating body according to claim 1, wherein the pair of compression molds are operated after operating the plurality of diameter reducing molds. One or more detents are formed on the outer periphery, and a metal bush that rotates about an axis;
A reinforcing fiber base disposed in a state of being fitted to the outer periphery at a position outside the outer periphery of the metal bush;
A resin rotating body comprising a resin molded body formed by impregnating a resin into the reinforcing fiber base and curing the resin;
The reinforcing fiber base material is a cylindrical reinforcing fiber having a through hole in which a large number of reinforcing fibers are gathered so as not to form a boundary surface inside and the outer peripheral portion of the metal bush is fitted in the central portion. The assembly is formed by being compressed in a direction toward the outer peripheral portion of the metal bush and an axial direction of the shaft in a state of being fitted to the outer peripheral portion of the metal bush. Resin rotating body. The anti-rotation portion is composed of a protruding portion that protrudes radially outward of the shaft,
The thickness dimension measured in the axial direction of the protrusion is smaller than the thickness dimension measured in the axial direction of the metal bush,
The outer peripheral portion of the metal bush is provided with a plurality of the protruding portions at predetermined intervals in the circumferential direction of the shaft,
A part of the reinforcing fiber base material is fitted in a recess formed between two adjacent projecting parts, and the plurality of projecting parts are embedded in the reinforcing fiber base material. The resin rotating body according to claim 9, wherein the rotating body is made of resin. The anti-rotation portion is composed of a plurality of protrusions protruding from the central portion of the metal bush toward the radially outer side of the shaft,
A recess is formed between two adjacent protrusions,
The protrusions and the recesses are arranged to be alternately arranged in the circumferential direction of the shaft ,
When h1 is a projecting dimension of the projecting part from the central part and h2 is a height dimension of the bottom of the recess from the central part, when h1> h2,
The length of the reinforcing fiber is not less than the smaller value of 0.5 × h1 mm and 1 × h2 mm, and not more than the larger value of 5 × h1 mm and 10 × h2 mm. The resin rotating body described.   The ratio of the said reinforcement fiber with respect to the said resin molding is 30 volume% or more and 50 volume% or less, The resin-made rotary body of Claim 9 characterized by the above-mentioned.   The resin rotating body according to claim 9, wherein the resin molded body is machined to form a plurality of teeth. Providing one or more detents on the outer periphery and providing a metal bush that rotates about an axis;
A method for manufacturing a resin-made rotating body half-processed product comprising a step of forming a reinforcing fiber base disposed in a state of being fitted to the outer peripheral portion at a position outside the outer peripheral portion of the metal bush. Because
Forming the reinforcing fiber substrate comprises:
Forming a cylindrical reinforcing fiber assembly comprising a through hole in which a large number of reinforcing fibers are gathered so as not to form a boundary surface inside and the outer peripheral portion of the metal bush fits in a central portion;
Fitting the reinforcing fiber assembly to the outer periphery of the metal bush;
A resin comprising: a step of compressing the reinforcing fiber assembly fitted to the outer peripheral portion of the metal bush in a direction toward the outer peripheral portion of the metal bush and an axial direction of the shaft. A method for manufacturing a semi-finished product for forming a rotating body. The step of forming the cylindrical reinforcing fiber assembly includes the step of sucking the slurry in which the reinforcing fiber chop is dispersed in water through a papermaking mold having a plurality of through holes of 10 mesh or more and 250 mesh or less. Stacking to form a plate-like aggregate;
The method for producing a semi-finished product for molding a resin rotating body according to claim 14, comprising: punching out the cylindrical reinforcing fiber assembly from the plate-like assembly. The step of forming the cylindrical reinforcing fiber assembly includes
An inner cylinder provided with a plurality of through holes of 10 mesh or more and 250 mesh or less, an outer cylinder provided with a plurality of through holes of 10 mesh or more and 250 mesh or less arranged concentrically with the inner cylinder, Preparing a papermaking mold comprising a bottom member provided with a plurality of through holes of 10 mesh or more and 250 mesh or less connecting between the inner cylinder and the lower end of the outer cylinder;
15. The step of collecting the reinforcing fiber chops on the bottom member while sucking the slurry in which the reinforcing fiber chops are dispersed in water through the papermaking mold to form the cylindrical reinforcing fiber assembly. The manufacturing method of the semi-finished product for resin-made rotary body shaping | molding of description. A metal bush having one or more detents formed on the outer periphery and rotating about an axis;
A resin rotary body molding semi-finished product comprising a reinforcing fiber base disposed in a state of being fitted to the outer peripheral portion at a position outside the outer peripheral portion of the metal bush,
The reinforcing fiber base material is a cylindrical reinforcing fiber having a through hole in which a large number of reinforcing fibers are gathered so as not to form a boundary surface inside and the outer peripheral portion of the metal bush is fitted in the central portion. The assembly is formed by being compressed in a direction toward the outer peripheral portion of the metal bush and an axial direction of the shaft in a state of being fitted to the outer peripheral portion of the metal bush. Semi-finished product for molding resin rotating bodies. The anti-rotation portion is composed of a protruding portion that protrudes radially outward of the shaft,
The thickness dimension measured in the axial direction of the protrusion is smaller than the thickness dimension measured in the axial direction of the metal bush,
The outer peripheral portion of the metal bush is provided with a plurality of the protruding portions at predetermined intervals in the circumferential direction of the shaft,
A part of the reinforcing fiber base material is fitted in a recess formed between two adjacent projecting parts, and the plurality of projecting parts are embedded in the reinforcing fiber base material. The semi-processed product for molding a resin rotating body according to claim 17, wherein: The detent portion comprises a plurality of projecting portions that project from the central portion of the metal bush toward the radially outer side of the shaft,
A recess is formed between two adjacent protrusions,
The protrusions and the recesses are arranged to be alternately arranged in the circumferential direction of the shaft ,
When h1 is a projecting dimension of the projecting part from the central part and h2 is a height dimension of the bottom of the recess from the central part, when h1> h2,
The length of the reinforcing fiber is not less than the smaller value of 0.5 × h1 mm and 1 × h2 mm, and is not more than the larger value of 5 × h1 mm and 10 × h2 mm. Semi-processed product for molding resin rotating bodies as described. A metal bushing which rotates about an axis having a structure arranged in the radial center of the shaft, and the die mechanism for compressing said radially reinforcing fiber aggregate to the outer diameter of the predetermined length, then And a reinforcing fiber base molding die characterized by having a die mechanism for compressing in the axial direction of the shaft to a predetermined thickness.   A pair of center pins that support the metal bushing from both sides in the axial direction and a radially outer side of the metal bush supported by the pair of center pins, and a reinforcing fiber assembly is disposed on the outer peripheral portion. A plurality of diameter-reducing molds operating to approach the center pin in order to compress in the direction toward the center, and arranged outside the pair of center pins and compressing the reinforcing fiber assembly in the axial direction Therefore, the reinforcing fiber base molding die according to claim 20, further comprising a pair of compression dies that move relatively in the axial direction along the pair of center pins. A reinforcing fiber substrate having one or more anti-rotation portions on the outer peripheral portion and arranged in a state of being fitted to the outer peripheral portion at a position outside the outer peripheral portion of the metal bush that rotates about an axis. Forming step;
A step of impregnating the reinforcing fiber substrate with a resin, and curing the resin to form a resin molded body, comprising:
Forming the reinforcing fiber substrate comprises:
Forming a cylindrical reinforcing fiber body comprising a plurality of reinforcing fibers so as not to form a boundary surface inside and having a through-hole into which the outer peripheral portion of the metal bush fits in a central portion;
Fitting the reinforcing fiber body to the outer peripheral portion of the metal bush;
The reinforcing fiber body fitted to the outer peripheral portion of the metal bush is formed from a step of compressing in the direction toward the outer peripheral portion of the metal bush and the axial direction of the shaft. A manufacturing method of a rotating body. The fiber base for reinforcement method for manufacturing a resin rotating body according to claim 22 comprising a plurality of reinforcing fibers gathered configured cylindrical reinforcing fiber aggregate.   The said reinforcing fiber base material forms the cylindrical body in which the said reinforcing fiber was woven or knitted into the cylinder shape, and it was formed in the shape of a donut by turning over from the edge part. Of manufacturing a resin rotating body.

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