JP2739292B2 - Manufacturing method of composite member for sliding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for manufacturing a sliding composite member.

[0002]

2. Description of the Related Art Resin sliding members are widely used in various fields. However, in places where temperature changes are large or when dimensional tolerances are severe, the linear expansion coefficient of the resin material is large. In some cases, problems such as rattling and overload may occur due to changes in the composition, and even if a filler is added, the solution has not yet been fundamentally solved. In order to reduce the absolute amount of expansion and contraction, the thickness of the sliding member is reduced, but in this case, there is a disadvantage that the mechanical strength is poor. Therefore, various sliding composite members in which a metal tube is arranged on the outer periphery of a resin sliding member have been proposed. For example, a method has been proposed in which a sheet-like sliding member is wound around and adhered to the inner peripheral surface of a metal tube, or a sliding resin material having fluidity is injection-molded inside the metal tube.

[0003]

However, of the above-mentioned conventional methods for manufacturing a composite sliding member, the method of winding and bonding a sheet-like sliding member adheres uniformly to the inner peripheral surface of the metal tube without wrinkles. This requires a high level of technology, and there is a problem that a step is generated in the joining portion of the sheets, which causes rattling during sliding. Further, when wound around a small-diameter metal tube or when the sliding member is hard, there is a disadvantage that cracks are likely to occur when the sliding member sheet is processed to have a curvature of the inner periphery of the metal tube. On the other hand, in the method of injection-molding a sliding resin material, a mold is required for each product size, which increases the cost, and among the fluororesin materials, there is a particularly low friction and excellent self-lubricating properties. There is a problem that this method cannot be applied since fluoroethylene resin cannot be injection molded.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for easily and inexpensively manufacturing a sliding composite member using a fluororesin having low friction and excellent self-lubricating properties by simple means. .

[0005]

In order to achieve the above object, a method of manufacturing a sliding composite member according to the present invention comprises a step of subjecting an outer surface of a filled fluororesin tube to a surface treatment, applying an adhesive, The gist is that the metal tube is drawn into a metal tube having an inner diameter larger than the outer diameter, and the two are integrated by caulking the metal tube from the outside.

[0006]

In the manufacturing method of the sliding composite member, since the fluororesin tube containing the filler is drawn into the metal tube and then caulked from the outside of the metal tube, both of them are combined with the adhesive force of the adhesive. Strongly integrated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 shows an example of a sliding composite member obtained by the manufacturing method of the present invention, and FIGS. 2 (a) and 2 (b).
Indicates the manufacturing process. In FIG. 1, reference numeral 1 denotes a metal tube on the outer peripheral side constituting the composite member for sliding A,
There is no restriction on the material, but brass,
Soft metals such as aluminum and aluminum alloys are desirable. In this example, an aluminum tube was used, and the inner peripheral surface of the aluminum tube was polished with a wire brush and roughened. A filler-containing fluororesin tube 3 is fixed to the inner peripheral side of the aluminum tube 1 via an adhesive 2 by adhesion. Fluorine resin is PTF
E, PFA, FEP, ETFE, PCTFE, ECTF
E, PVDF, kind of like PV F does not matter, PTFE
(Ethylene tetrafluoride resin) has the lowest friction characteristics and is therefore desirable as a sliding material.

[0008] The viscosity of the adhesive 2 used here greatly affects the processing step and the dimensional stability of the final product. In the case of a low-viscosity adhesive, the adhesive may flow out of the metal tube and cause poor adhesion. In the case of high viscosity adhesive,
A large load is required when pulling the filled tube made of ethylene tetrafluoride resin into the metal tube. Although the type of the adhesive is not limited, in this embodiment, a room-temperature-curable epoxy resin-based adhesive having a medium viscosity (Cemedine,
The trade name "Cemedine" SG-EPO EP007) was used.

[0009] The above-mentioned filler-containing tetrafluoroethylene resin tube 3 is formed by adding various kinds of fillers, for example, glass fiber, graphite, carbon fiber, to the tetrafluoroethylene resin powder in order to improve the abrasion resistance and dimensional stability. , A molybdenum disulfide or the like, and a filler-filled tetrafluoroethylene resin tube manufactured by a paste extrusion method or a ram extrusion method. In the present embodiment, tetrafluoroethylene containing 25% of glass fiber manufactured by the paste extrusion method is used. An ethylene resin tube was used.

Next, an example of a method of manufacturing the sliding composite member will be described with reference to FIGS. The filled tube made of tetrafluoroethylene resin (inner diameter: 17.6)
mm, an outer diameter of 21.6 mm) is roughened with sandpaper or the like, and then surface-treated with sodium-naphthalenetetrahydrofuran to activate the surface, and the epoxy resin-based adhesive 2 is applied. As shown in FIG. 2A, the resin tube 3 is inserted into an aluminum tube (inner diameter 23 mm, outer diameter 25.5 mm) having an inner diameter larger than that of the resin tube 3 by using a cylindrical drawing guide jig 4. Is pulled in the direction of the arrow to be integrated. In this case, by previously roughening the inner peripheral surface of the aluminum tube with sand blast or a wire brush or the like, the adhesive enters into the uneven portion, and stronger adhesiveness can be obtained.

When the resin tube is drawn into the aluminum tube, a uniform adhesive layer 2 is formed by forming an adhesive reservoir 5 in the drawing guide jig 4 as shown in FIG. Is done. That is, when the resin tube 3 is pulled in, the adhesive applied to the outer peripheral side thereof is squeezed by the drawing guide jig 4 to form an adhesive pool, and the resin tube 3 continues to be drawn in. A fixed amount of adhesive is sequentially drawn in from the adhesive pool, and an adhesive layer 2 having a fixed thickness is formed.

Next, as shown in FIG. 2B, the resin tube 3 is drawn into the aluminum tube 1 by using a caulking metal die 6 and a caulking mandrel 7.
Before the adhesive 2 between the resin tube 3 and the aluminum tube 1 hardens, the caulking metal die 6 having an inner diameter slightly smaller than the outer diameter of the aluminum tube 1 and the inner diameter of the resin tube 3 The aluminum tube 1 and the resin tube 3 are simultaneously pulled out at a constant speed in the direction of the arrow by passing between the caulking metal mandrels 7 having a slightly smaller inner diameter and an inner peripheral surface having a constant curvature. As a result, the aluminum tube 1 is swaged, the gap between the aluminum tube 1 and the resin tube 3 is filled with the adhesive 2, and both are firmly adhered. The curvature of the inner peripheral surface of the caulking metal die 6 is suitably 3 to 5 mmR, and if the curvature is out of this range, it becomes difficult to perform smooth machining. Also, if the speed of pulling out is too fast, it will cause burn-in,
If the speed is low, the productivity is deteriorated.
Performed at min speed. However, it may be performed at a lower speed. At this time, the inner peripheral side of the resin tube 3 is corrected by the caulking metal mandrel 7 to have a constant inner diameter. After curing the adhesive 2,
It is cut into a predetermined length to obtain the sliding composite member A shown in FIG.

[0013]

As described in detail above, according to the method of manufacturing a sliding composite member according to the present invention, the following effects can be obtained. (1) Since the fluororesin tube containing the filler is adhered inside the metal tube, there are no joints or steps on the inner peripheral surface.
There is no displacement, rattling, overload, etc. during sliding. (2) Since the metal tube is caulked before the adhesive is cured after the surface treatment is applied to the outer surface of the filled fluororesin tube and the adhesive is cured, the adhesive is filled with the fluororesin containing the filler. It spreads to every corner of the gap between the metal tube and the metal tube, and a strong adhesive force is obtained. (3) Since the fluororesin tube containing the filler is drawn into the metal tube and then caulked from the outside of the metal tube, both are completely adhered to each other and are firmly integrated with the adhesive force of the adhesive. There is no displacement, peeling, or the like of the filler-containing fluororesin tube in the subsequent cutting step, and a sliding composite member that withstands long-term use and has excellent durability can be obtained. (4) It is possible to obtain a sliding composite member which does not require complicated devices, instruments and the like, is easy to operate, and is excellent in economy. (5) Since a long sliding composite tube can be continuously formed,
A sliding composite member having excellent productivity can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sliding composite member obtained by a manufacturing method of the present invention.

2A and 2B are manufacturing process diagrams according to the present invention. FIG. 2A shows a process of drawing a resin tube coated with an adhesive into a metal tube, and FIG. 2B shows a caulking process of the metal tube.

[Explanation of symbols]

 A Composite member for sliding 1 Aluminum tube 2 Adhesive layer 3 Tube made of tetrafluoroethylene resin containing filler 4 Retraction guide jig 5 Adhesive reservoir 6 Metal die for caulking 7 Metal mandrel for caulking

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 31/20 B32B 31/20 // B29K 27:12 105: 22 B29L 9:00 23:00 31:04 (56) References JP-A-54-162051 (JP, A) JP-A-3-169360 (JP, A) JP-A-3-147831 (JP, A) JP-A-49-18968 (JP, A) JP-A-50-60572 (JP, A) JP-A-58-167118 (JP, A) JP-A-60-224523 (JP, A) JP-B-35-17580 (JP, B1)

Claims (1)

(57) [Claims] After applying a surface treatment to an outer surface of a fluororesin tube containing a filler and applying an adhesive, the tube is drawn into a metal tube having an inner diameter larger than the outer diameter of the tube, and the metal tube is crimped from the outside to form a tube. A method for manufacturing a composite member for sliding, characterized in that: