JP2011230340A - Fiber-containing resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-containing resin molding reduced in weight by employing a fiber-reinforced resin or a high-rigidity fiber-reinforced resin for a large component which is conventionally formed of metal (iron, aluminum or the like), and reduced in cost by integrally molding a slide part and other members.SOLUTION: This fiber-containing resin molding 1 is structured such that a slide part 20 is integrally molded; a slide surface 21 of the slide part 20 is formed into an uneven shape along a sliding direction in which a sliding contact member slides; and fibers 30 are oriented nearly parallel to the sliding direction.

Description

 The present invention relates to a resin molded body having a sliding portion integrally molded with a fiber-containing resin.

  Currently, in order to reduce carbon dioxide emissions in the automobile industry, there is an urgent need to reduce the weight of each part. In order to reduce the weight, for example, a large component conventionally made of a metal (such as iron or aluminum) is substituted with a fiber-containing resin. In order to obtain a rigidity equivalent to that of a metal, a device for increasing the fiber content, lengthening the fiber, and applying a highly rigid fiber such as a carbon fiber has been devised. Some of the large metal parts to be covered include sliding parts such as rails and cylinders, but the fibers included to increase the rigidity are not included because the sliding surface becomes rough depending on the orientation at the time of inclusion. There is a risk that the frictional resistance will increase compared to the case. For this reason, the sliding part of the resin molding which a fiber contains is not integrally molded, but when it is assembled | attached as another component, or a metal component is insert-molded in many cases.

JP 2006-22892 A JP 2000-218711 A

 The description of Patent Document 1 discloses a sliding member made of a woven fabric made of continuous carbon fiber and a resin impregnated with the fabric. The sliding surface is made of a woven fabric formed of a fiber bundle made of a plurality of continuous carbon fibers. Insert molding by press molding is also possible, but it is expensive because it employs a continuous fiber fabric. Moreover, although attention is paid to the unevenness | corrugation of the surface of a sliding part, the sliding characteristic is improved by reducing the unevenness | corrugation.

 The description of Patent Document 2 discloses a thermoplastic resin molded article containing carbon fibers excellent in mechanical properties and surface properties. Even if a long fiber having a length of 1.5 mm or more is used, the resin molded product has a good surface condition after molding by surface treatment of the fiber itself, and ensures slidability. Therefore, thermoplastic resin molded products require electrical conductivity like electrical parts, and can be applied to parts with low mechanical requirements, but they have been applied to rigid large metal parts that were conventionally made of metal. Is difficult. Further, the molded product for measuring the slidability is a simple plate.

  Therefore, the present invention employs a fiber reinforced resin and a highly rigid fiber reinforced resin for large parts made of metal such as iron or aluminum, thereby reducing the weight compared to the conventional one, and sliding parts and others. The object is to reduce the cost by integrally molding the members.

  In the first aspect of the present invention, in the fiber-containing resin molded body having a sliding portion and containing fibers, the sliding portion is integrally formed with the fiber-containing resin molded body, and the sliding surface of the sliding portion is: The fiber-containing resin molded body is characterized in that it has an uneven shape along the sliding direction in which the sliding contact member slides, and the fibers are oriented substantially parallel to the sliding direction.

 In this case, the contained fiber may be carbon fiber.

  Moreover, the weight average fiber length of the said fiber to contain is good in it being 1 mm or more and 20 mm or less.

  The fiber-containing resin molded body may be provided in a vehicle, and the sliding portion may be a rail that guides an opening / closing body that opens and closes with respect to an opening provided in the vehicle by a sliding contact member.

  According to the first aspect of the present invention, since the uneven shape extends in the sliding direction of the sliding surface, the contact area on the sliding surface is reduced compared to the case without the uneven shape. It is possible to reduce the surface pressure of the part. Thereby, friction resistance can be lowered at the sliding portion of the fiber-containing resin molded body. Moreover, by integrally molding, it is possible to reduce the cost compared to insert molding or assembly of separate parts. In addition, sliding noise is reduced. Moreover, since the contained fiber is orientated substantially parallel to the sliding direction in the convex part, the fiber-containing resin molded body can increase the rigidity against a load applied in the sliding direction during sliding.

 According to the present invention, the fiber-containing resin molded body can be further reduced in rigidity and weight by using carbon fibers.

 Moreover, according to this invention, when a weight average fiber length is 1 mm or more and 20 mm or less, a fiber containing resin molding can improve rigidity and intensity | strength. Further, if the fiber length is long, the end portion of the fiber can be reduced, and the fiber-containing resin molded body can reduce the frictional resistance.

 In addition, according to the present invention, since it is an integrally molded product having rails that are concave and convex sliding portions, assembly after molding is eliminated, and cost reduction is possible. Furthermore, since the opening / closing body of the vehicle is guided by the rail, the fiber-containing resin molded body can reduce sliding noise generated in the rail (sliding portion) when the opening / closing body is opened / closed.

(A) The schematic of the surface of the sliding part used for an Example, (b) The principal part enlarged view of the dashed-two dotted line part of (a). Sectional drawing of the sliding part shown in FIG. 1, (a) Sectional drawing of Example 1, (b) Sectional drawing of Example 2 which is a modification of Example 1. FIG. The assembly drawing of the vehicle slide door which employ | adopted the fiber containing resin molding of this invention. The external view of the step member shown in FIG. The block diagram of the reciprocating sliding test machine which evaluates the frictional resistance of a sliding part (plate). The schematic diagram of the rotation member shown in FIG.

  An embodiment of the present invention will be described with reference to FIGS. Fig.1 (a) shows the surface shape of the sliding part of the fiber containing resin molding used for the Example of this invention, FIG.1 (b) is a principal part enlarged view of the dashed-two dotted line part of Fig.1 (a). The figure is shown. Further, FIG. 2 shows a sectional view of the concavo-convex-shaped sliding portion used in the present embodiment in a direction orthogonal to the sliding direction, FIG. 2A is a sectional view of the first embodiment, and FIG. These show sectional drawing of Example 2 which is a modification of Example 1. FIG.

  As shown to Fig.1 (a), the uneven | corrugated shape is shape | molded along the sliding direction in the sliding surface 21 of the one side of the sliding part 20 of the fiber containing resin molding 1, and the uneven | corrugated shaped convex part 22 is formed. Is extended in a sliding direction in which a sliding contact member (not shown in FIGS. 1 and 2) slidable with respect to the sliding surface 21 moves. Since the sliding surface 21 having the concavo-convex shape has a small contact area with the slidable contact member, the surface pressure of the sliding surface 21 can be reduced as compared with the case where there is no concavo-convex shape. Thereby, the sliding part 20 can suppress the frictional resistance generated between the sliding surface 21 and the sliding contact member. Moreover, as shown in FIG.1 (b), the fiber 30 contained is contained substantially parallel with respect to the sliding direction similarly to the convex part 22. FIG.

  As shown in FIG. 2, the curvature radius R of the tip of the convex portion 22 of the sliding portion 20 is 0.1 or more and 3 or less, particularly more than 0.5 and 2 or less, particularly more than 0.5 and 1.5 or less. Good. Although it may be 0.5 or less as shown in FIG. 2B, when the fiber content is high (for example, the fiber content is 30%), the end of the fiber 30 comes out on the surface of the convex portion 22, and the surface is Get rough. For this reason, as shown in FIG. 2A, the fiber-containing resin molded body 1 preferably has a larger curvature radius R depending on the fiber content. Further, it is desirable to change the distance (pitch) between the adjacent convex portions 22 in accordance with the contact area with the sliding contact member. A pitch is ensured so as to contact two or more convex portions 22 with respect to the sliding contact member. When the convex part 22 contacts the sliding contact member at two or more points, the stress applied to the tip of the convex part 22 can be dispersed and wear can be suppressed. In the present embodiment, the distance between the protrusions 22 (pitch) is formed to be 1.5 mm to 2.5 mm.

  The resin is not particularly limited. It may be a thermoplastic resin or a thermosetting resin. In the case of thermoplastic resin, polyamide (PA) resin, polyacetal (POM) resin, polyphenylene sulfide (PPS) resin, polypropylene (PP) resin, etc. can be mentioned. Polyamide (PA) resin and polyacetal having particularly good sliding properties. (POM) resin and polyphenylene sulfide (PPS) resin are preferred.

  The fiber 30 contained in the fiber-containing resin molded body 1 is not particularly limited. Examples thereof include organic fibers such as carbon fibers, glass fibers, and aramid fibers, and metal fibers. In particular, since carbon fiber has a low specific gravity and high rigidity, the effect of reducing the weight is great. Moreover, even if it is one type of fiber, multiple types of fiber may be mixed.

  The molding method may be injection molding or stamping mold molding. In the case of injection molding, it is desirable to arrange the gates so that the fibers 30 are oriented. In the embodiment, the gate employs a film gate, the injection port is widened with respect to the molded body, and the fiber 30 is shaped so as to be parallel from the vicinity of the injection port.

  Next, the case where the fiber-containing resin molded body 1 of this embodiment is used for the step member 40 of the vehicle slide door 3 will be described with reference to FIGS. 3 and 4. FIG. 3 shows an assembly view of the vehicle slide door 3 employing the fiber-containing resin molded body 1 of the present invention, and FIG. 4 shows an external view of the step member 40 shown in FIG.

  The step member 40 of the fiber-containing resin molded body 1 as shown in FIGS. 3 and 4 is provided on the vehicle 2 side adjacent to the vehicle slide door 3 which is an opening / closing body, and the vehicle slide is placed on the lower surface of the step member 40. A pair of lower rails 41 (hereinafter referred to as rails 41) are provided so as to hang along the opening / closing direction of the door 3. By moving a sliding member (not shown in FIGS. 3 and 4) in the rail 41, the vehicle slide door 3 is opened and closed. By making the longitudinal surfaces of the sliding surfaces 42a and 42b of the sliding rail 41 have an uneven shape, the contact area between the sliding contact member and the sliding surfaces 42a and 42b is reduced, and the friction generated on the rail 41 is reduced. Reduce. For this reason, during the operation of the vehicle sliding door 3, it is possible to reduce the sliding noise generated by the friction of the rail 41 or the like. In the case of injection molding, the gate position is arranged on the surfaces of the sliding surfaces 42a and 42b so that the fibers 30 are oriented in the longitudinal direction. In the case of stamping molding, it is desirable that the fibers 30 are oriented in the sliding direction in consideration of the arrangement of the plate-like base material. Moreover, since the rail 41 having the uneven sliding surface 41 of the step member 40 is integrally formed, the weight and cost can be reduced.

The test piece which gave the above embodiment was created, and the plane abrasion test was done. The evaluation results are shown in Table 1.

(Example 1)
A corrugated plate (150 mm × 150 mm × 4 mm) as shown in FIG. 1 was formed using a polyamide 6 material (manufacturer: Toray, Great: TLP1060) containing 30% carbon long fibers. The distance (pitch) between the convex portions 22 was 2.5 mm, and the radius of curvature R at the tip of the convex portion 22 was 1.0. The gate was a film gate, and resin was injected so that the fibers 30 on the surface were oriented. Although the fiber length after molding differs depending on the part, the fiber was molded under conditions such that the weight average fiber length was 1 to 2 mm.

(Example 2)
A corrugated plate (150 mm × 150 mm × 4 mm) as shown in FIG. 2 was formed using the same polyamide 6 material as in Example 1 (manufacturer: Toray, Great: TLP1060). The distance (pitch) between the protrusions 22 was 1.5 mm, and the radius of curvature R at the tip of the protrusion 22 was 0.5. The gate was a film gate, and resin was injected so that the fibers 30 on the surface were oriented. Although the fiber length after molding differs depending on the part, the fiber was molded under conditions such that the weight average fiber length was 1 to 2 mm.

(Comparative Example 1)
A flat plate (150 mm × 150 mm × 4 mm) was molded using the same polyamide 6 material as in Example 1 (manufacturer: Toray, Great: TLP1060). The gate was a film gate, and resin was injected so that the fibers 30 on the surface were oriented. Although the fiber length after molding differs depending on the part, the fiber was molded under conditions such that the weight average fiber length was 1 to 2 mm.

(Examples 3 and 4 and Comparative Example 2)
In the same shape as in Examples 1 and 2 and Comparative Example 1, the material was molded using a polyamide material containing 15% carbon long fiber (manufacturer: Toray, grade: TLP1060 and CM1017 mixed 1: 1). . The gate was a film gate, and resin was injected so that the fibers 30 on the surface were oriented. Although the fiber length after molding differs depending on the part, the fiber was molded under conditions such that the weight average fiber length was 1 to 2 mm.

(Examples 5 and 6, Comparative Example 3)
In the same shape as in Examples 1 and 2 and Comparative Example 1, the material was molded using a polyamide material (manufacturer: Toray, Grade: 1001T15) containing 15% short carbon fibers. The gate was a film gate, and resin was injected so that the fibers 30 on the surface were oriented. It shape | molded on the conditions that the weight average fiber length after shaping | molding will be 0.5 mm or less.

(Evaluation conditions)
Next, a reciprocating sliding test machine 50 used in this embodiment will be described with reference to FIGS. FIG. 5 shows a configuration diagram of a reciprocating sliding test machine 50 for evaluating the frictional resistance of the sliding portion (plate), and FIG. 6 shows a schematic diagram of the sliding contact member 53 shown in FIG.

  Evaluation was performed with a reciprocating sliding tester 50 as shown in FIG. The reciprocating sliding test machine 50 is connected to a detector 52 that detects friction on a flat plate 51 and is provided with a rotating member 53 that is a sliding member capable of setting an arbitrary load. The friction coefficient is obtained by sliding. The rotating member 53 is a ring-shaped resin member having a diameter of 22 mm and a width of 6 mm as shown in FIG. The sliding speed was 3000 mm / min and the stroke was 30 mm. The load was 1 kg. The number of sliding was 1000 times, and the average value of the friction coefficients was defined as the dynamic friction coefficient.

(Evaluation results)
As shown in Table 1, it was found that Examples 1 to 6 had a smaller coefficient of friction than those of Comparative Examples 1 to 3, and were excellent in slidability. In particular, when the content of the filled carbon fiber is 20% or more, particularly 30% or more, the ratio of the fiber end portion appearing on the surface is reduced due to the uneven shape of the example, so that the effect of reducing the dynamic friction coefficient is great. In addition, the effect of reducing the dynamic friction coefficient can be obtained regardless of whether the weight average fiber length is long or short. However, the longer the weight average fiber length, the greater the dynamic friction reducing effect. This is because the long fibers are long, and the fibers are likely to appear on the surface layer of the flat plate 51.

  Further, when the radius of curvature R is larger than 0.5 or 1.0 or more, the fibers 30 are easily oriented to the convex portions 22 and the elastic modulus is increased. Further, the ratio of the end portion of the fiber 30 to the sliding surface 21 is small, and the surface smoothness is good. The surface state in Table 1 is the result of visual observation. If there are 4 or more places where the fiber is protruding and the surface of the convex portion 22 is not smooth, X is 1 or more and 3 or less, and ○ is none. It was.

  As mentioned above, although the structure of the Example was demonstrated, this invention is not limited to this, You may change into the aspect shown below.

-Although the sliding part 20 is used as the rail 41 by the use application of a present Example, it is good also as sliding members, such as a cylinder.

  The sliding surface 21 of the present invention is not limited to the rail-shaped sliding portion 20, and the sliding portion such as a cylinder similarly has an uneven shape to obtain an effect of reducing friction. be able to.

1 Fiber-containing resin molded body 2 Vehicle 3 Vehicle sliding door (opening / closing body)
20 Slide part 21, 42a, 42b Slide surface 22 Convex part 30 Fiber 40 Step member 41 Rail 53 Rotating member (sliding contact member)

Claims (4)

In a fiber-containing resin molded body having a sliding part and containing fibers,
The sliding portion is integrally formed with the fiber-containing resin molded body, and the sliding surface of the sliding portion has an uneven shape along the sliding direction in which the sliding contact member slides, and the fibers are slid. A fiber-containing resin molded article, which is oriented substantially parallel to the moving direction.  The fiber-containing resin molded product according to claim 1, wherein the fiber is a carbon fiber.   The fiber-containing resin molded article according to claim 1 or 2, wherein a weight average fiber length of the fibers is 1 mm or more and 20 mm or less.  The fiber-containing resin molded body is provided in a vehicle, and the sliding portion is a rail that guides an opening / closing body that opens and closes with respect to an opening provided in the vehicle by the sliding contact member. The fiber-containing resin molded product according to any one of 1 to 3.

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