JP2011027182A - Screwing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight screwing member using carbon fibers and joining material such as synthetic resin and enhanced in the strength of a screw thread portion in particular. <P>SOLUTION: The screwing member 1 includes a screwing member body 10 having: a number of flat foil-like carbon fiber aggregates S formed of linear carbon fibers assembled parallel and laminated in the axial direction with the joining material BI interposed among them; and a screw formed in the outer peripheral surface. The carbon fiber aggregates S, S of the screwing member body 10 are different in directions of the carbon fibers of adjacent aggregates and include in one pitch T<SB>P</SB>of the screw the aggregates different in directions of the carbon fibers. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lightweight screwing member using carbon fiber and a bonding material.

  2. Description of the Related Art In general industry, a screwing member is widely used for coupling a member formed with a male screw or a female screw to another member formed with a female screw or a male screw, that is, screwing and fastening or transmitting motion. The member for screwing is generally made of metal such as iron or stainless steel. However, when weight is important, a synthetic resin member or a member reinforced with a fiber is also used. Patent Document 1 describes a fiber-reinforced resin fastening bolt obtained by press-molding a material containing a synthetic resin with long fibers such as carbon fibers oriented in the axial direction. This fiber reinforced resin fastening bolt is intended to improve the shear strength of the shaft by arranging long fibers linearly on the outer peripheral portion and bending the shaft center portion.

JP-A-6-185514

  Such a screw member made of synthetic resin reinforced with carbon fibers, particularly long fibers, can be increased in strength and is very lightweight. However, higher strength is required depending on the facility and machine used. For example, since the bolt described in Patent Document 1 heats and melts a synthetic resin containing long fibers and presses them against a forming jig, the screws are formed. Does not contribute much and there is at least room for improvement.

  The present invention has been made in view of the above reasons, and its purpose is light weight using carbon fiber and a bonding material such as a synthetic resin, and in particular, the strength of the thread portion is increased. The object is to provide a screwing member.

  In order to achieve the above-mentioned object, the screwing member according to claim 1 is configured such that a flat foil-like carbon fiber assembly formed by collecting linear carbon fibers in parallel is interposed in the axial direction with a bonding material interposed therebetween. A plurality of layers are provided, each including a screwing member main body having a screw formed on an outer peripheral surface or an inner peripheral surface, and the carbon fiber aggregates of the screwing member main body are different from each other in the direction of the carbon fibers. In addition, the pitch of the carbon fibers is different from each other within one pitch of the screw.

  The screwing member according to claim 2 is the screwing member according to claim 1, wherein the carbon fiber aggregate of the screwing member main body has at least two layers within one pitch of the screw. It is characterized by that.

  The screwing member according to claim 3 is the screwing member according to claim 1 or 2, wherein the carbon fiber aggregates of the screwing member main body are different from each other in the direction of carbon fibers at the top portion of the screw thread. It is characterized by being laminated to contain things.

  The screwing member according to claim 4 is the screwing member according to any one of claims 1 to 3, wherein carbon fiber directions of adjacent carbon fiber aggregates of the screwing member main body are orthogonal to each other. It is characterized by having a relationship.

  The screwing member according to claim 5 is a carbon fiber aggregate formed by collecting carbon fibers so as to be parallel or oblique to the axial direction in the screwing member according to any one of claims 1 to 4. It further has the member auxiliary member for screwing containing.

  The screwing member according to claim 6 is the screwing member according to any one of claims 1 to 5, wherein a film of diamond-like carbon is provided on at least a surface of the screw. To do.

  The screwing member according to claim 7 is the screwing member according to any one of claims 1 to 6, wherein the screw is a male screw and is formed on an outer peripheral surface of the screwing member main body. It is characterized by.

  The screwing member according to claim 8 is the screwing member according to any one of claims 1 to 6, wherein the screw is a female screw and is formed on an inner peripheral surface of the screwing member main body. It is characterized by that.

  According to the screwing member according to the present invention, the carbon fiber aggregates of the multi-layered screwing member main body are adjacent to each other, and the directions of the carbon fibers are different from each other, and the carbon fiber assembly is within one pitch of the screw. Since the different directions are included, the strength of the thread portion can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS The screwing member 1 which concerns on embodiment of this invention is shown, Comprising: (a) is the top view seen from the front end side of the thread part 1a, (b) is front sectional drawing. FIG. 2 is an enlarged view of a part of a screwing member main body 10 of a screw part 1a of the screwing member 1 according to the first embodiment, where (a) is a front view and (b) is a front sectional view. The carbon fiber aggregate S of the screwing member main body 10 of the screwing member 1 is schematically shown in the direction of the carbon fiber CF of S, and (a) and (b) are adjacent carbon fiber aggregates. It is a plane view enlarged sectional view of S and S. It is a front view which shows simply the plate-shaped body BL formed in the middle of manufacture of the screwing member main body 10 of the screwing member 1 same as the above. It is the front view sectional view which expanded and showed a part of screwing member main part 10 of another example of screw part 1a of screwing member 1 same as the above. It is the schematic diagram which saw through the screwing member main body 10 of the screwing member 1 same as the above from the front end side of the screw part 1a. FIG. 2 is an enlarged view of a screwing member auxiliary body 11 of the screwing member 1 according to the embodiment, in which (a) is a plan view and (b) is a partial front sectional view. It is. A modification 1 'of the screwing member 1 is shown, in which (a) is a plan view seen from the front end side of the threaded portion 1a', and (b) is a front sectional view. It is sectional drawing seen from the front which shows another modification 1 '' of the member 1 for screwing same as the above. It is front view sectional drawing which expanded and showed a part of member 2 for screwing concerning another embodiment of this invention. The modification 2 'of the screwing member 2 is shown, in which (a) is a plan view and (b) is a front sectional view.

  Hereinafter, preferred embodiments for carrying out the present invention will be described. The screwing member 1 according to the embodiment of the present invention is used as a fastening bolt. As shown in FIG. 1, the screwing member 1 has a screwing member main body 10 having the same external shape as a normal bolt having a screw part 1a on which a male screw is formed and a head part 1b. Yes. The screw member main body 10 has a hole in the axial direction, and a screw member auxiliary body 11 is inserted into the hole.

  The screw member main body 10 has a male screw formed on the outer peripheral surface, and as shown in FIG. 2B, a flat foil-like (for example, a thickness of about 0.1 to 0.2 mm) carbon fiber assembly A large number of bodies S are stacked in the axial direction (the direction along the central axis Ce). This carbon fiber aggregate S is formed by assembling linear carbon fibers CF (for example, a diameter of about 0.5 to 50 μm) in parallel (and perpendicular to the axial direction). The carbon fiber aggregate S is laminated with a bonding material BI called a base material (matrix) interposed therebetween, and the carbon fibers CF constituting the carbon fiber aggregate S are impregnated with the bonding material BI. Or by another bonding material. These carbon fiber assemblies S, S are adjacent to each other (adjacent via the bonding material BI), but have different carbon fiber CF directions (directions in which the carbon fibers CF extend). In this embodiment, as shown in FIG. 3, the adjacent carbon fiber aggregates S, S are different in a relationship in which the directions of the carbon fibers CF are orthogonal to each other, that is, 90 degrees.

  The member main body 10 for screwing can be manufactured as follows. Specifically, a carbon fiber aggregate S having a predetermined size is coated or impregnated with a synthetic resin (for example, epoxy resin) or pitch as a bonding material BI, laminated so that the directions of the carbon fibers CF are different, and heated and heated. All the carbon fiber assemblies S are fixed by pressurization, and a so-called carbon fiber reinforced carbon composite material (C / C composite) or carbon fiber reinforced plastic (CFRP) having a predetermined thickness as shown in FIG. A plate-like body BL is formed. The carbon fiber content is, for example, about 40 to 70 vol%. In the case of a C / C composite, the heating temperature is a high temperature (for example, 2000 to 3000 ° C.) at which the synthetic resin or pitch of the bonding material BI is carbonized and partially graphitized. Graphite and graphite of the carbon fiber aggregate S are strongly bonded. In the case of CFRP, the temperature is lower than that, and the synthetic resin of the bonding material BI is cured and bonded to the carbon fiber assembly S. The C / C composite or CFRP is determined from the strength required for the screwing member 1 (the strength of the thread portion described later, the shear strength of the shaft, etc.), the operating temperature, and the like.

  Then, a large number of prototypes of the screwing member body 10 are cut out from the plate-like body BL and cut so that the axial direction of the screwing member 1 is the stacking direction of the carbon fiber assemblies S. Cutting and cutting are performed using a cutting edge such as diamond to form an outer shape including a screw of the screw member main body 10 and a hole into which the screw member auxiliary body 11 is inserted. Thus, the member main body 10 for screwing can be manufactured.

Carbon fiber assembly S of Nishigoyo member body 10 is stacked so that the directions of the carbon fibers CF within one pitch T _P of the screw contains a different thing. Preferably, the carbon fiber assembly S is at least two layers are laminated to exist within one pitch T _P of the screw. The two-layer portion refers to the total of two layers of the complete carbon fiber assembly S, or one layer of the complete carbon fiber assembly S and the upper and lower layers of the carbon fiber assembly S having a thickness of one layer. Total, say. Specifically, the pitch _{T P} of the screw is 1.75 mm, the thickness of the carbon fiber assembly S is 0.1 mm, the thickness of the bonding material BI is to 0.05 mm, as shown in FIG. 2 (b) , so that one pitch T _P carbon fiber assembly S of more than 11 layers min in are stacked. In another example, for example, when the pitch _{T P} of the screw is 0.8 mm, the thickness of the carbon fiber assembly S is 0.2 mm, the thickness of the bonding material BI is to 0.15 mm, as shown in FIG. 5 in, so that one pitch T _P carbon fiber assembly S of more than two layers within are stacked. By carbon fiber assembly S so that the directions of carbon fibers CF contain different from each other are stacked within one pitch T _P, of the screw when the Nishigoyo member 1 is threadedly engaged with a member for screwing the internal thread The strength of the thread portion against the shearing force in the vicinity of the root (valley bottom) 10B is increased. This will be described below with reference to FIG. Note that when one pitch T _P in the carbon fiber assembly S so that at least two layers are present is laminated, the strength of the threaded portion against the shear force is increased in a stable manner.

In FIG. 6, points A to E are points having different angular positions in the circumferential direction at the root 10B of the screw. Vertical straight line figures represent carbon fibers CF passing through either the point A ~E point along the direction DIR _1. Lateral direction of the straight line in the drawing represents the carbon fibers CF passing through either the point A ~E point along the direction DIR _2. At a point A on the carbon fiber CF _1A that extends along the direction DIR ₁ and intersects the central axis Ce, at least the carbon fiber CF _1A acts and the strength of the thread portion is increased by the bending strength. At the point _E on the carbon fiber CF _2E that extends along the direction DIR ₂ and intersects the central axis Ce, at least the carbon fiber CF _2E acts and the strength of the thread portion is increased by the bending strength. At the point C in the middle of the angular position between the points A and E, at least the carbon fiber CF _1C and the carbon fiber CF _2C act to increase the strength of the thread portion by the bending strength. At point B in the middle of the angular position between point A and point C, at least carbon fiber CF _1B and carbon fiber CF _2B act to increase the strength of the thread portion by the bending strength. At the point D in the middle of the angular position between the point C and the point E, at least the carbon fiber CF _1D and the carbon fiber CF _2D act to increase the strength of the thread portion by the bending strength. In this way, in the screw base 10B, the carbon fiber CF in any direction acts to increase the strength of the thread portion at any angular position in the circumferential direction.

Preferably, the carbon fiber aggregates S are stacked so that the top portions of the threads, that is, 10T between the tips of both slopes (flanks) of the threads, include carbon fibers CF having different directions. To do. In the example of FIG. 2 (b), the width T _T of the thread of the top portion 10T is approximately 0.22 mm, is laminated carbon fiber assembly S to include what the direction of the carbon fiber CF different Yes. By laminating the carbon fiber aggregates S so that the directions of the carbon fibers CF are different from each other at the top portion 10T of the screw thread, the screwing member 1 is combined with the screwing member of the female screw, thereby screwing the member 1 Even when a large shearing force is locally applied to the top portion 10T of the screw thread when a force is applied such that the shaft of the screw is inclined with respect to the shaft of the female screw threading member, the strength against that is increased.

  Further, the carbon fiber aggregates S in which the directions of the carbon fibers CF are orthogonal to each other are not alternately stacked, and the direction of the carbon fibers CF is a certain angle (for example, 45 degrees or 60 degrees). Different carbon fiber assemblies S may be laminated in order. Also in this case, the carbon fiber CF in any direction acts to increase the strength of the thread portion at any angular position in the circumferential direction.

  The screwing member auxiliary body 11 includes a carbon fiber aggregate S ′ formed by aggregating carbon fibers CF so as to be parallel or oblique to the axial direction. For example, as shown in FIG. 7, a foil-like carbon fiber assembly S ′ formed by collecting linear carbon fibers CF in parallel, similar to the carbon fiber assembly S, is wound in a ring shape or spirally. A plurality of tubular bodies are provided around the central axis Ce, and are fixed by a bonding material BI ′ similar to the bonding material BI. The central portion including the central axis Ce may be provided with a carbon fiber aggregate S ′ as shown in FIG. 7 or may be a small-diameter hole formed along the central axis Ce. Alternatively, instead of the plurality of tubular bodies, one foil-like carbon fiber aggregate S ′ may be wound in a roll shape and the adjacent surfaces may be fixed with the bonding material BI ′. The screwing member auxiliary body 11 is a kind of so-called C / C composite or CFRP. The screwing member auxiliary body 11 and the screwing member main body 10 are both a combination of C / C composite, a combination of CFRP, a combination of CFRP and C / C composite, and a combination of C / C composite and CFRP. Is possible.

  The screwing member auxiliary body 11 inserted into the screwing member main body 10 is processed to prevent the screwing member auxiliary body 11 from falling out of the screwing member main body 10. Specifically, the screwing member main body 10 and the screwing member auxiliary body 11 are fixed with a bonding material similar to the bonding material BI, thereby preventing falling off. Further, when a diamond-like carbon film is formed on the surface of the screw as will be described later, at the same time, the screw member main body 10 and the screw member auxiliary body 11 on the end surface of the screw portion 1a and the opposite end surface of the head 1b. It is possible to prevent falling out by forming a diamond-like carbon film at the boundary between the two.

Since the carbon fiber CF is oriented parallel or obliquely in the axial direction in the screwing member auxiliary body 11, the screwing member 1 including the carbon fiber CF depends on the bending strength of the carbon fiber CF of the screwing member auxiliary body 11. The shear strength of the shaft, that is, the strength against the shear force in the direction perpendicular to the central axis Ce is high. That is, in the screw member main body 10 described above, the carbon fiber aggregates S are laminated in the axial direction, and the carbon fibers CF are oriented perpendicular to the axial direction, and shear in a direction perpendicular to the central axis Ce. Since the strength against the force is not so high, the screwing member auxiliary body 11 complements and enhances it.

  Further, as shown in FIG. 1, not only a single screwing member auxiliary body 11 is inserted along the central axis Ce as shown in FIG. 1, but also four screwing member auxiliary bodies 11 ′ as shown in FIG. It is also possible to insert a plurality of items like Further, the diameter can be partially changed as in the screwing member auxiliary body 11 ″ shown in FIG. 9. Further, the screwing member auxiliary body 11 (or 11 ', 11' ') is usually a columnar shape or a cylindrical shape, but may be a prismatic shape or a rectangular tube shape depending on circumstances.

  Next, the surface treatment of the screwing member 1 will be described. A cut surface of the carbon fiber CF appears on the surface of the screw of the screw member main body 10. The surface of such a screw is likely to have unstable characteristics, and chipping and cracking are likely to occur. Therefore, it is preferable to provide a diamond-like carbon (DLC) film that is vapor-phase grown on the surface of the screw.

  The diamond-like carbon film is formed by a deposition method such as plasma CVD or PVD, and is hard. Further, since the diamond-like carbon film can be used from a general low friction coefficient (high lubricity) to a high friction coefficient, the screwing member 1 can be easily screwed or loosened. In consideration of balance, the friction coefficient can be made appropriate.

  The screwing member 1 described above can be modified and applied to various fastening members. When applied to a tapping screw or a wood screw, it is natural that a screwing member auxiliary body 11 is provided from the inside of the head part of the screw part 1a to the end of the head part.

  Next, a screwing member 2 according to another embodiment of the present invention will be described. This screwing member 2 is used as a fastening nut. The screwing member 2 has an outer shape similar to that of a normal nut, and includes a screwing member main body 20 in which a female screw is formed.

  As shown in FIG. 10, the screw member main body 20 is also formed by laminating a large number of carbon fiber assemblies S substantially the same as the screw member main body 10 in the axial direction with the bonding material BI interposed therebetween. An internal thread is formed on the surface. The screw member main body 20 can be manufactured in the same manner as the screw member main body 10.

The carbon fiber assemblies S and S of the screwing member main body 20 are also different from each other in the direction of the carbon fibers CF of the adjacent ones as in the screwing member main body 10. The direction of the carbon fibers CF within one pitch T _P of the screw is laminated to contain different from each other, preferably laminated such that at least the two layers are present. As a result, at any angular position in the circumferential direction, any carbon fiber CF acts to increase the strength of the thread portion. Preferably, similarly to the screw member main body 10, the carbon fiber CF includes a top portion of the screw thread, that is, between the tip ends of both slopes (flanks) of the screw thread, including carbon fibers CF having different directions. The aggregate S is laminated so that even if a large shearing force is locally applied to the top of the screw thread, the strength against it is increased.

  Since the screwing member 2 is usually short in the axial direction, the shearing force applied in the direction perpendicular to the axial direction is not so large, and a screwing member such as the screwing member auxiliary body 11 in the screwing member 1 is used. An auxiliary body is not always necessary. However, when the axial length is relatively long, a plurality of screwing member auxiliary bodies may be inserted, such as the six screwing member auxiliary bodies 21 shown in FIG.

  The surface treatment of the screwing member 2 is preferably provided with a diamond-like carbon (DLC) coating on the surface of the thread as in the screwing member 1.

  The screw engagement member according to the embodiment of the present invention has been described above, but the present invention is not limited to the one described in the embodiment, and various design changes within the scope of the matters described in the claims. Is possible. For example, the above-described screwing member can be modified and applied to uses such as motion transmission other than fastening and position adjustment. At this time, the other member to be screwed (engaged) may be a gear or the like.

1, 2 Screwing member 10, 20 Screwing member main body 10B, 20B Root (valley bottom) of screwing member main body
10T, 20T top portion of Nishigoyo member body of the thread 11, 21 Nishigoyo member auxiliary member BI bonding material CF Carbon Fiber S width of the top portion of the pitch T _T thread of a carbon fiber aggregate T _P screw

Claims (8)

A plurality of flat foil-like carbon fiber aggregates formed by collecting straight carbon fibers in parallel are laminated in the axial direction with a bonding material interposed therebetween, and a screw having a screw formed on the outer peripheral surface or the inner peripheral surface. It has a joint member body,
The carbon fiber aggregates of the screw member main body include those in which the directions of carbon fibers of adjacent ones are different from each other and the directions of the carbon fibers are different from each other within one pitch of the screw. Element. The screwing member according to claim 1,
The screw member according to claim 1, wherein the carbon fiber aggregate of the screw member main body has at least two layers in one pitch of the screw. In the screwing member according to claim 1 or 2,
The screw member according to claim 1, wherein the carbon fiber assembly of the screw member main body is laminated so as to include carbon fibers in different directions at the top portion of the screw thread. In the screwing member according to any one of claims 1 to 3,
The screwing member according to claim 1, wherein directions of carbon fibers of adjacent carbon fiber aggregates of the screwing member main body are orthogonal to each other. The screwing member according to any one of claims 1 to 4,
A screwing member, further comprising a screwing member auxiliary body including a carbon fiber aggregate in which carbon fibers are aggregated so as to be parallel or oblique to the axial direction. In the member for screwing of any one of Claims 1-5,
A screwing member characterized in that a diamond-like carbon film is provided on at least the surface of the screw. In the member for screwing of any one of Claims 1-6,
The screw is a male screw and is formed on the outer peripheral surface of the screw member main body. In the member for screwing of any one of Claims 1-6,
The screw is a female screw, and is formed on the inner peripheral surface of the screw member main body.

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