JP2009113486A - Manufacturing method of resin rotor, resin gear, and manufacturing method of semi-fabricated part for forming resin rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a highly reliable resin rotor, by improving the bonding strength between a detent provided onto the outer peripheral part of a metal bushing and a reinforcing fiber base material, even when only one reinforcing fiber base material is employed. <P>SOLUTION: In order to form the reinforcing fiber base material 5, a tubular reinforcing fiber assembly 8, which is composed of a large number of reinforcing fibers assembled together and, at the same time, has a through-hole for fitting the outer peripheral part of the metal bushing at the center, is formed. Then, the reinforcing fiber assembly 8 is fitted to the outer peripheral part of the metal bushing 2. Further, the reinforcing fiber assembly 8 fitted onto the outer peripheral part of the metal bushing 2 is compressed axially. This compression is executed under the condition that the more inner diametral and outer diametral expansion of the reinforcing fiber assembly than the predetermined amount is suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a resin rotating body, and the present invention relates to a method for manufacturing a semi-processed part for molding a resin rotating body.

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. Are listed. 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, paragraph numbers 0013 to 0015 are disclosed.
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, the injected resin leaks into the entire molding die made of a metal mesh etc., and it is not easy to take out the molded product after curing, and the molding die is clogged, so it can be used repeatedly. There is a problem that disappears.

JP 2001-295913 A JP-A-11-227061 Japanese Patent Laid-Open No. 2001-1413 JP 2005-96173 A

  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 usage. 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 method for manufacturing a resin rotating body or a semi-processed part for molding a resin rotating body.

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. An aggregate is formed. Next, the reinforcing fiber assembly is fitted to the outer periphery of the metal bush. Then, the reinforcing fiber assembly fitted on the outer periphery of the metal bush is compressed in the axial direction of the shaft. This compression is performed in a state where the reinforcing fiber assembly is restricted from spreading more than a predetermined amount in the inner diameter direction and the outer diameter direction.

  In this way, in the process of compressing one reinforcing fiber assembly in the axial direction of the metal bush, the bulky reinforcing fiber assembly is buckled in the inner diameter direction at the central portion in the axial direction. Thereby, the reinforcing fiber assembly is pressed against the rotation stopper of the metal bush, and the rotation stopper of the metal bush can be completely wrapped. 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. Further, by the buckling, it is possible to obtain a resin-made rotating body half-processed part in which the density of the reinforcing fibers becomes rough, dense, and rough from the side close to the metal bush. The resin rotating body using this can increase the fiber density of the portion that meshes with the mating component, and can improve the durability performance.

  Reinforcing fiber aggregates that do not have a boundary surface inside are obtained by accumulating reinforcing fiber chops while sucking slurry in which the reinforcing fiber chops are dispersed in water through a papermaking mold having a plurality of through holes. The step of forming and the step of punching the cylindrical reinforcing fiber assembly from the plate-like assembly can be formed. 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 having a plurality of through holes 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 discarded increases like the punching.
The inner diameter of the reinforcing fiber assembly is preferably larger than the outer diameter of the metal bush detent.

  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 can be constituted by two types of protrusions having different protrusion dimensions protruding outward in the radial direction. And it is preferable to arrange | position two types of protrusion parts so that it may line up alternately in the said circumferential direction.

  Further, in order to compress the reinforcing fiber assembly in the axial direction in the present invention, for example, the reinforcing fiber assembly extends radially inward from the outer peripheral portion of the metal bush and radially outward from the outer peripheral portion of the reinforcing fiber integrated body. When the reinforcing fiber assembly is compressed in the axial direction in a state where the above is regulated, the reinforcing fiber moves toward the inside in the radial direction of the metal bush in the compression process. As a result, the reinforcing fibers are pressed against the outer periphery of the metal bush, and the density of the reinforcing fibers around the one or more detents can be increased. The restriction that the reinforcing fiber aggregate is spread radially inward from the outer peripheral portion of the metal bush may be allowed to spread slightly inward, and the reinforcing fiber aggregate may be covered over the periphery of the metal bush.

  Note that a pressing device for enabling such pressing includes, for example, a cylindrical mold that restricts the reinforcing fiber base material from spreading outward in the radial direction of the metal bush during the compression operation, and a cylindrical mold A portion located inside the outer periphery of the metal bush is sandwiched from both sides in the axial direction and the reinforcing fiber assembly is restricted from spreading radially inward from the outer periphery of the metal bush during the compression operation. A pair of metal bushing support molds and a pair of compression bushings positioned between the cylindrical mold and the metal bush support mold and compressing the reinforcing fiber assembly from both sides in the axial direction during compression operation It is preferable to provide a mold. With such a compression mold, when the reinforcing fiber assembly is compressed with a pair of compression molds, the outer side of the metal bush is radially inward and the outer side of the reinforcing fiber assembly is radially outer. It is possible to reliably prevent the reinforcing fibers from expanding in both directions. In this case, the contact surface that contacts the reinforcing fiber substrate of at least one compression mold of the pair of compression molds is between the contact surface that contacts the reinforcing fiber assembly of the other compression mold. The inclined surface may be inclined such that the distance becomes longer as the distance from the cylindrical mold approaches the pair of metal bush supporting molds.

If the resin molded body is machined to form a plurality of teeth, it is possible to obtain a resin 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.
If the production is stopped before impregnation with the resin, a semi-processed part for molding a resin rotating body can be produced.

  The reinforcing fiber base formed by the method of the present invention has no overlapping interface with the reinforcing fiber base and does not peel off. From these things, the durability performance of resin-made rotary bodies, such as a resin-made gearwheel, improves significantly.

  According to the present invention, in the process of compressing one reinforcing fiber assembly in the axial direction, a part of the reinforcing fiber base, that is, the reinforcing fiber moves in a direction toward the outer periphery of the metal bush, Since the non-rotating portion can be completely wrapped, and the density of the reinforcing fiber base in the vicinity of the outer periphery of the metal bush can be increased, the fiber layer can be formed inside the reinforcing fiber base as in the past. Without forming a boundary surface, it is possible to improve the bonding strength between the reinforcing fiber base and the detent portion of the metal bush, and greatly improve the durability performance of resin rotating bodies such as resin gears. The advantage that can be 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. 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. Moreover, the protrusion part 4 which comprises a some rotation stop part is integrally formed in the outer peripheral part of metal bushes at predetermined intervals in the circumferential direction. The shaft may be integrally formed with the metal bush 2. The thickness dimension L2 measured in the axial direction of the plurality of protrusions 4 is smaller than the thickness dimension L1 measured in the axial direction of the metal bush 2. The metal bush used in the present embodiment is manufactured by a sintering method. And the protrusion part 4 which comprises a rotation prevention part is an undercut shape with a thick top part and a thin base part. The metal bush 2 has an angle θ with respect to the cross section of 5 ° or more and 40 ° or less. As shown in FIG. 2, in order to enhance the action of the anti-rotation portion that can withstand a load in the rotation direction, preferably, the protrusion serving as the anti-rotation portion has at least two types of protrusions having different heights h1 and h2. It is preferable that the parts 4A and 4B are alternately arranged. When two kinds of protrusions having such an undercut shape and an angle θ of 5 ° or more and 40 ° or less are used, a plurality of protrusions 4A as rotation preventing portions are provided in the reinforcing fiber base 5 described later. It becomes a completely filled state, and the strength of the mechanical bond between them can be made sufficient. Note that the mechanical strength is naturally increased also when a part of the reinforcing fiber base material 5 enters a recess formed between two adjacent protrusions.

  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. A resin molded body 6 is formed in which the reinforcing fiber base 5 is impregnated with resin and cured. 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 formed by being compressed in the axial direction of the shaft while being fitted to the outer periphery of the metal bush 2. As described later, various types of reinforcing fibers can be used for forming the reinforcing fiber substrate 5 or the reinforcing fiber assembly 8.

  Further, in order to strengthen the connection between the rotation stopper provided on the outer peripheral portion of the metal bush 2 and the resin portion, the thickness of the top measured in the axial direction is the thickness dimension of the base. It is effective to have an undercut shape larger than that of the pair of side surfaces opposed to each other in the axial direction of the metal bush and having an angle of 5 ° to 40 °, preferably 10 ° to 35 °. . This acts to prevent removal in the outer diameter direction.

  The projecting portion constituting the anti-rotation portion having the undercut shape can be accurately made 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 lower ends of the inner cylinder 10 and 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 fiber chop is sucked by the pump P and the water is drained from the papermaking mold 9, the time required for separation of the fiber 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 a reinforcing fiber chop having a long fiber length is used, the mesh gap (through hole) is large, so that most of the reinforcing fiber flows out together with water. 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.

  Further, the cylindrical reinforcing fiber assembly 8 forms a plate-like assembly 26 as shown in FIG. 8, and the cylindrical reinforcing fiber assembly 8 is punched out (pressed out) from the plate-like assembly 26. May be formed.

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 fiber chop, the fiber chop in the resin-made rotating body undergoes thermal deterioration at the molding temperature and processing temperature at the time of molding and the atmospheric temperature at the time of actual use. And a resin rotating body having excellent heat resistance. 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.

  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 fiber chop is dispersed in water is preferably 0.3 g / liter or more and 20 g / liter or less. 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 a low concentration of 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 the steps for manufacturing the resin-made rotating body forming half-processed part provided with the reinforcing fiber base 5 by compressing the reinforcing fiber assembly 8 will be described with reference to FIG. The press apparatus shown in FIG. 5 has a cylindrical mold 15 that restricts the reinforcing fiber base material from spreading outward in the radial direction of the metal bush during the compression operation, and a metal that is disposed inside the cylindrical mold 15. A pair of metals that sandwich a portion located inside the outer periphery of the bush 2 from both sides in the axial direction and restrict the reinforcing fiber assembly 8 from spreading radially inward from the outer periphery of the metal bush 2 during compression operation Located between the bush-supporting molds 16 and 17 and the cylindrical mold 15 and the pair of metal bush-supporting molds 16 and 17, the reinforcing fiber assembly 8 is sandwiched from both sides in the axial direction during the compression operation. And a pair of compression molds 18 and 19 for compression. With such a compression mold, when the reinforcing fiber assembly 8 is compressed by the pair of compression molds 18 and 19, the inner side in the radial direction from the outer periphery of the metal bush 2 and the outer periphery of the reinforcing fiber assembly. It is possible to reliably prevent the reinforcing fibers from bulging out in both directions radially outward from the portion.

At this time, as shown in FIG. 5C, the bulky reinforcing fiber assembly 8 is buckled in the inner diameter direction at the central portion in the axial direction. Thereby, the reinforcing fiber assembly 8 is pressed against the rotation preventing portion of the metal bush 2, and the rotation preventing portion of the metal bush can be completely wrapped. Further, as schematically shown in FIG. 10, by the buckling, it is possible to obtain a semi-processed part for molding a resin rotary body in which the density of the reinforcing fibers is rough, dense, and rough from the side close to the metal bush. it can. The density of the reinforcing fibers can be confirmed, for example, by taking a cross-sectional photograph (about 500 times) of the resin rotating body with an electron microscope and measuring the number of reinforcing fibers per unit area.
The reinforcing fiber assembly 8 can be used to produce a semi-processed part for molding a resin rotating body, either by compressing it in a moisture-containing state or by compressing it in a dry state. It is more preferable to use a reinforced fiber assembly containing moisture from the viewpoint that the return amount of the base material thickness of the resin-made rotating body forming half-processed part is small.

  Next, as shown in FIG. 6, after the resin-made rotating body forming half-processed part provided with the reinforcing fiber base 5 is placed in the mold 27, a liquid resin is injected into the mold 27, and the reinforcing fiber base The material 5 is impregnated with a resin and then cured to form a resin rotating body provided with a resin molded body. A resin gear can be obtained by forming a tooth 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 short, and the resin is cured before the resin is sufficiently impregnated into the reinforcing fiber base.

  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 fiber is hardly seen, and the filling of the fiber into the metal bush detent is insufficient. Further, when the proportion of the reinforcing fibers exceeds 50% by volume, the proportion of the fibers is too high, which causes problems such as insufficient resin impregnation of the resin during resin injection molding. Therefore, the ratio of the fiber contained in the fiber reinforced resin composite has the strength of the rotating body made of resin, and the fiber is surely placed in the recess for rotation prevention formed between the two protrusions and around the rotation prevention part. More preferably, it is 35 to 45% by volume, which is filled and does not hinder the impregnation of the resin.

Examples of the present invention will be described below.
Example 1
In order to produce a slurry, the total amount of reinforcing fibers in the resin molded product is 40% by volume in a tank filled with water in an amount of 1 g / liter when the fiber chop is added. 50% by mass of para-aramid fiber “Technola (trademark)” manufactured by Teijin Limited with a ratio of 200, and 45% by mass of meta-aramid fiber “Conex (trademark)” manufactured by Teijin Limited with an aspect ratio of 200 4 and fine fiber "Kevlar (trademark)" manufactured by DuPont Co., Ltd., which has been fibrillated to a freeness value of 300 ml, are added in amounts of 5% by mass, and stirred and dispersed with a stirrer. In the case of using a mold, the cavity portion S in the case 13 is depressurized to 80 kPa or less by the depressurizing pump P. Then, the fiber choke dispersed in the papermaking mold 9 is used. Filling a slurry containing obtain a cylindrical reinforcing fiber aggregate 8 separates the chopped fibers and water. It should be noted as a wire mesh that constitutes the papermaking mold with wire mesh metal 70 mesh.

  Next, using the mold shown in FIG. 5, the metal bush 2 is disposed on the lower center pin 17 of the mold center, and then the cylindrical reinforcing fiber assembly 8 is replaced with the lower compression mold. Place on the mold 19. The shape of the protrusion 4 of the metal bush 2 to be used is h1 = 2 mm and h2 = 0.5 mm, is an undercut shape, and the angle θ with respect to the cross section of the metal bush 2 is 20 °. Then, the metal bush 2 is sandwiched between the lower center pin 17 and the upper center pin 16. Thereafter, the reinforcing fiber assembly 8 is compressed in the axial direction to a predetermined thickness by the pair of compression molds 18 and 19. Thereby, the cylindrical reinforcing fiber assembly 8 is integrated with the protrusion 4 provided on the metal bush 2. This is dried to obtain the reinforcing fiber substrate 5.

  Next, as shown in FIG. 6, the reinforcing fiber base material 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, 69 parts by mass of 2,2 ′-(1,3-phenylene) bis-2-oxazoline (“1,3-PBO” manufactured by Mikuni Pharmaceutical Co., Ltd.) , 4,4′-diaminodiphenylmethane (“MDA” manufactured by Mitsui Chemicals Co., Ltd.) mixed with 31 parts by mass is dissolved at a temperature of 140 ° C., 1 part by mass of octyl bromide is added, and the agitated resin is placed inside the mold. The reinforcing fiber base material 11 is injected and impregnated, and heat-cured in the molding die 27 to obtain a gear material. A resin gear is obtained by forming teeth by cutting this gear material.

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, two reinforcing fiber bases press-molded with a mold so that the cross section is rectangular are used, and as shown in FIG. 7, the projecting portion 4 provided on the metal bush 2 is sandwiched and heated. Place in 41 and clamp. 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 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 blending and concentration as in Example 1 is introduced into the papermaking mold 25 and dehydrated to obtain an aggregate 26 'having a thickness of 20 to 30 mm. After the accumulated product 26 ′ is dried, it is punched into a ring shape having an outer diameter φ80 mm × an inner diameter φ55 mm to obtain a cylindrical reinforcing fiber assembly 8. When producing a resin rotating body, two reinforcing fiber assemblies 8 are used. The input amount of the reinforcing fiber is calculated so that the volume of the reinforcing fiber relative to the resin molded body when the resin rotating body is manufactured using the reinforcing fiber assembly 8 is 40% by volume.

  Two reinforcing fiber aggregates 8 obtained in the above process are used, and as shown in FIG. 7, the protrusion 4 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.

Table 1 shows the results of measuring the boss punching strength using the resin gears produced by the methods shown in Example 1 and Comparative Examples 1-2. The measuring method is as follows.
Boss removal strength: As shown in FIG. 9, the resin gear 51 is disposed on a cylindrical base 55 that 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 was attached from above, and a load was applied to this to measure the maximum load that caused the resin gear 51 to break.

From the comparison between Example 1 and Comparative Examples 1 and 2, since Example 1 of the present invention has improved fiber filling properties in the undercut portion of the metal bush compared to Comparative Examples 1 and 2, the boss punching strength is high. It has improved.

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 (D) is a figure which shows the formation process of the fiber base material for a reinforcement in order. It is explanatory drawing which shows the state which has arrange | positioned the resin-made rotary body shaping | molding semi-processed part 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. (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 a figure which shows the structure of the apparatus which measures the boss punch strength. It is explanatory drawing which shows a mode when a reinforcement fiber assembly is compressed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin rotating body 2 Metal bush 3 Through-hole 4, 4A, 4B Protrusion part (rotation prevention part)
5 Reinforcing fiber substrate 8 Reinforcing fiber assembly

Claims (7)

A metal bush having one or more detents on the outer periphery and rotating about an axis;
Forming a reinforcing fiber base disposed on the outer periphery of the metal bush in a state of being fitted to the outer periphery; and
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 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 assembly to the outer periphery of the metal bush;
Compressing the reinforcing fiber assembly fitted to the outer periphery of the metal bush in the axial direction of the shaft;
The step of compressing in the axial direction of the shaft is performed in a state in which the reinforcing fiber assembly is restricted from spreading more than a predetermined amount in the inner diameter direction and the outer diameter direction.   In the step of compressing in the axial direction of the shaft, the inner diameter of the reinforcing fiber assembly is expanded radially inward from the outer periphery of the metal bush, and the outer diameter of the reinforcing fiber assembly is expanded outward in the radial direction. The method for manufacturing a resin rotating body according to claim 1, wherein the reinforcing fiber assembly is compressed in the axial direction in a state where the pressure is regulated.   The step of compressing in the axial direction of the shaft includes a cylindrical mold that restricts the reinforcing fiber assembly from spreading outward in the radial direction of the metal bush during a compression operation, and an inside of the cylindrical mold. The portion of the metal bush positioned inside the outer peripheral portion is sandwiched from both sides in the axial direction, and the reinforcing fiber assembly is restricted from spreading radially inward from the outer peripheral portion of the metal bush during the compression operation. A pair of metal bushing supporting molds, and the cylindrical metal mold and the pair of metal bushing supporting molds sandwiching the reinforcing fiber assembly from both sides in the axial direction during a compression operation. The manufacturing method of the resin-made rotating body according to claim 2, which is carried out by a press device provided with a pair of compression molds to be compressed by the step.   A resin gear formed by performing gear cutting on a resin molded body of a resin rotating body manufactured by the method according to any one of claims 1 to 3. A metal bush having one or more detents on the outer periphery and rotating about an axis;
A method for producing a resin-made rotating body half-processed part 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. There,
Forming the reinforcing fiber substrate comprises:
Forming a cylindrical reinforcing fiber assembly 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 assembly to the outer periphery of the metal bush;
Compressing the reinforcing fiber assembly fitted to the outer periphery of the metal bush in the axial direction of the shaft;
The step of compressing in the axial direction of the shaft is carried out in a state where the reinforcing fiber assembly is restricted from spreading more than a predetermined amount in the inner diameter direction and the outer diameter direction. Production method.   A resin rotating body characterized in that the density of reinforcing fibers is coarse, dense, or coarse from the side close to the metal bush.   A semi-processed part for molding a resin rotating body, characterized in that the density of the reinforcing fibers is rough, dense, or rough from the side close to the metal bush.

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