JPS63235798A - Extensible protective cover and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a stretchable protective cover used to cover lead screws of various machines such as lathes and presses, and exposed shaft members of rams, spindles, cylinders, screws, etc. It is.

[Prior art]

Conventionally, it has been known to cover the surrounding shaft material with an elastic protective cover in order to protect the exposed shaft material from dust and other foreign matter or to prevent the human body from coming into direct contact with the shaft material. There is. As such a protective cover, a compression spring made of a band-shaped elastic body wound into a conical shape, a so-called bamboo shoot spring, is generally used (Japanese Patent Laid-Open No. 59-94532).
(Japanese Patent Publication No. 50-39215, etc.).

However, conventionally used bamboo springs are made by winding a steel strip material with a high specific gravity into a bamboo shoot shape, so they are heavy and easy to rust, and they also have poor springiness and frictional resistance. It also has the disadvantage of requiring a large amount of force to compress because it is too long.Furthermore, when it is made into a long object, its specific gravity is large, so it will bend due to its own weight, and there is a limit to its length, and furthermore, it is difficult to manufacture it. It also has the disadvantage of being confusing.

〔the purpose〕

The object of the present invention is to provide a stretchable protective cover that overcomes the above-mentioned drawbacks.

In order to overcome the drawbacks of the conventional bamboo springs made of steel, the inventors of the present invention have conducted various studies to produce bamboo springs made of synthetic resin material. Even if a plastic resin is used, it is not possible to obtain a bamboo shoot spring that is satisfactory, and by using a fiber-reinforced synthetic resin material made of fibers and synthetic resin, it is possible to manufacture a bamboo shoot spring that overcomes the above-mentioned drawbacks. I found it.

〔composition〕

According to the present invention, as a first invention, there is provided an elastic protective cover comprising a bamboo spring having a structure in which an elastic band-like material is wound with a part of the band-like material overlapping the fibers. An elastic protective cover is provided which is characterized by being made of a composite with a synthetic resin.

In addition, as a second invention, the upper and lower adjacent surfaces of a spiral strip made of a fiber-reinforced synthetic resin material made of fibers and synthetic resin are stacked in a bamboo shoot shape, and in this state, heat treatment is performed to fix the bamboo shoot state. A method of manufacturing a stretchable protective cover is provided.

Next, a stretchable protective cover of the present invention will be explained with reference to the drawings. FIG. 1 is an explanatory diagram of the shape of the stretchable protective cover according to the present invention, and the whole shows the shape of a bamboo shoot spring. Reference numeral 1 denotes a belt-like material which is wound in a spiral shape with the upper and lower adjacent surfaces overlapped like bamboo shoots, and is made of a fiber-reinforced synthetic resin composite consisting of &l fibers and synthetic resin. 2 indicates an overlapping portion of adjacent strip-shaped object surfaces.

In this overlapping part, the overlapping of the strips is such that 10 to 50%, preferably 15 to 30% of the length of the strips 111 overlap when the bamboo shoot spring is fully extended. Good. Further, the fiber density in the composite is preferably 30 to 80% by volume, preferably 45 to 75% by volume, and the density of this composite is generally 1.3 to 2. It is best to set it to 0g/d. When carbon fiber is used as the fiber, the density of the composite is 1.
3-1,7g/c4, preferably 1.4-1.6g
It is preferable to specify the range #j.

In the present invention, a fiber-reinforced synthetic resin material consisting of fibers and synthetic resin is used as the molding material. In this case, the fiber is carbon fiber.

In addition to inorganic fibers such as glass fibers and alumina fibers, organic fibers such as aromatic polyester fibers and aramid fibers, and metal fibers can be used alone or in combination.

Among these, carbon fiber is preferred because it has high elasticity.

The shape of the fiber is arbitrary, and it can be used in the form of a fiber bundle, woven fabric (cross), unidirectionally aligned fiber, braided material, or nonwoven fabric.
can be used, and combinations thereof can be used.

As the synthetic resin, both thermoplastic and thermosetting resins can be used. Examples of thermoplastic resins include polycarbonate, ABS resin, polyethylene terephthalate, polybutylene terephthalate, aromatic polyester, and nylon.

Aromatic polyamide, polyphenylene sulfide.

Polysulfone, polyether sulfone, polyether ether ketone, etc. can be used, and as those exhibiting thermosetting properties, for example, epoxy resin, unsaturated polyester resin, phenol resin, etc. can be used. In particular, it is preferable to use epoxy resin because it has a low viscosity and is compatible with fibers.

Note that the fiber-reinforced synthetic resin material referred to herein includes both prepreg and non-prepreg.

The product of the present invention can be obtained, for example, by stacking the upper and lower corner contact surfaces of a spiral strip made of a fiber-reinforced synthetic resin material made of fibers and synthetic resin in a bamboo shoot shape, and heat-treating it in this state. . In this case, the heat treatment can be carried out at a temperature higher than the glass transition point of the synthetic resin and lower than the melting point or thermal decomposition temperature. . Heat treatment time is usually 10~
It is about 60 minutes, preferably about 20 to 40 minutes. As shown in FIG. 2, the fiber orientation angle in the composite is set to 0. When B' is the fiber orientation angle and θ is the fiber orientation angle, it is preferable to use an angle within a range of 20 degrees because bending is less likely to occur even when a long object is made. , 20 degrees to 7
It is preferable to use one type or a combination of two or more types of angles selected from the range of 0 degrees and the range of 70 to 90 degrees, especially those within the range of 20 degrees and the angles of 70 to 90 degrees.
It is preferable to use a combination with a material within the range of 100% to 300% because the durability of the product is good.

Specific embodiments for manufacturing the product of the present invention include those shown below.

According to a first embodiment for manufacturing the product of the present invention, a strip prepreg of fiber-reinforced synthetic resin material made of fibers and synthetic resin is spirally wound around a core so as not to overlap with each other. When the resin exhibits thermoplasticity, after drying and removing the solvent, the resin is heated under pressure at a temperature above its glass transition temperature and below its decomposition temperature, and then cooled and solidified. When the resin exhibits thermosetting properties, it is removed from the mold after being thermosetted. Next, the upper and adjacent surfaces of the obtained spiral solidified body or hardened body strip are stacked in a bamboo shoot shape, and heat-treated in this state.

In this method, the shape of the fibers is preferably unidirectionally aligned fibers, woven fabric (cross), a combination of unidirectionally aligned fibers and woven fabric, or the like. In addition, to obtain a strip-shaped prepreg, the strip-shaped fibers are impregnated with a synthetic resin that is dissolved in a solvent or a synthetic resin that is liquid at room temperature or a synthetic resin that is solid at room temperature. Alternatively, it can be obtained by forming fibers impregnated with these synthetic resins into a band shape.

According to a second embodiment for manufacturing the product of the present invention, the fiber strip is spirally wound around a core so as not to overlap, and impregnated with a synthetic resin, and the fiber strip is impregnated with a synthetic resin. After the resin is assimilated or thermally cured, it is removed from the mold, and then the upper and lower adjacent surfaces of the obtained spiral solidified or cured strip are stacked in a bamboo shoot shape and heat treated.

In this method, the u&fibrous material may be a fiber bundle, woven cloth, m braid, nonwoven fabric, or the like.

According to a third embodiment for manufacturing the product of the present invention, a fiber-reinforced synthetic resin material made of fibers and synthetic resin is filled into a core-shaped groove having a spiral A and F-shaped groove,
After solidifying or thermosetting the resin in the same manner as in the first embodiment, the resin is demolded, and the upper and lower adjacent surfaces of the obtained spiral assimilation or cured product strip are stacked in a bamboo shoot shape, and heat treated in this state. .

In this method, the fiber-reinforced synthetic resin material made of fibers and synthetic resin can be used in a prepreg or non-prepreg state. The shape of the fibers used in this method is preferably a fiber bundle, a fabric, or a braid. Furthermore, in this method, it is preferable to use a woven fabric prepreg or a combination of a woven fabric prepreg and a unidirectionally aligned fiber prepreg as the fiber reinforced resin material.

Furthermore, in Embodiments 1, 2, and 3, the stretchable protective cover obtained by smoothing the surface of the spirally solidified or hardened material wound around a mandrel or the strip obtained therefrom using a centerless polishing machine, etc. This is preferable because it operates more smoothly when expanding and contracting.

Furthermore, the stretchable protective cover can be painted to harmonize the color with surrounding machinery or to provide hazard recognition signs such as black and yellow stripes, and the surface of the spiral solidified or hardened material strip can be painted. A cover plated with metal by a conventional method is preferable because even if it comes into contact with welding sparks generated during assembly of peripheral machines, the surface of the stretchable protective cover is less likely to be damaged by the heat.

In addition, the elastic protective cover of the present invention is obtained by heat-treating the upper and lower adjacent surfaces of a spiral assimilation or hardened material strip in a bamboo shoot shape, and the circumferential surfaces of the upper and lower ends thereof are perpendicular to the longitudinal direction. For example, when the stretchable protective cover is installed over the leadscrew, there will be a gap at the top and bottom ends. It is advisable to install a closure cap with holes.

〔effect〕

The elastic protective cover of the present invention is made of fiber reinforced resin (FRP)
Because it is made of steel, unlike traditional steel products,
It is lightweight, has good spring resilience, and can be compressed with a small compression force.

Furthermore, the product of the present invention does not rust and can be stored and used stably for a long period of time.
Since it is light in weight, it is less likely to bend even if it is made into a long item. Furthermore, the manufacturing method of the present invention does not require large-scale equipment, and can efficiently manufacture a stretchable protective cover with good dimensional accuracy.

〔Example〕

Example 1 Tapered metal rod-shaped mandrel (outer diameter of narrow end 40 mm)
mm, outside diameter of the thick end 50 m + m, length 500 mm), a band-shaped carbon fiber prepreg with a width of 25 mm (carbon fiber fabric V-3101 manufactured by Toho Rayon Co., Ltd. impregnated with epoxy resin and dried) was placed on top of the The orientation direction of the fibers is 0° (warp) and 90° (weft) with respect to the long axis direction of the mandrel, and the prepreg is wound in a spiral shape so as not to overlap each other, until the prepreg becomes three layers. Repeatedly winding the same prepreg, wrapping a synthetic resin tape on top to fix the wound prepreg, and after heating and curing, remove the synthetic resin tape to obtain a cured product of fiber reinforced resin,
The surface of this cured product was polished and the mandrel was removed to obtain a spiral strip. Next, the upper and lower adjacent surfaces of this spiral strip were successively overlapped in a bamboo shoot shape with a width of 5 mm, and while maintaining this state, heat treatment was performed at 150° C. for 30 minutes to obtain a bamboo shoot shape. Attach gap closing caps as shown in Figure 3 to the upper and lower ends of the obtained bamboo shoots with adhesive so that their plane parts are parallel to each other, and the outer diameter of the narrow end is 40 mm and the outer diameter of the thick end is 50 mm. , a stretchable protective cover with a height of 240 mm was obtained. The orientation angles of the fibers constituting this stretchable protective cover were 8 degrees (warp) and 82 degrees (weft) with respect to the long axis direction of the stretchable protective cover.

Example 2 A width produced by impregnating the same carbon fiber fabric as in Example 1 with a methyl ethyl ketone solution containing 30% by weight of ABS resin (Cycolac GS, manufactured by Ube Cycon Co., Ltd.) on the same mandrel as in Example 1. A 25 mm carbon fiber fabric prepreg was wound in the same manner as in Example 1. After drying the wound prepreg to remove the solvent, the prepreg was fixed with a synthetic resin tape and heated at 110°C for 30 minutes. After heat treatment for a minute, it was cooled to room temperature and the synthetic resin tape was removed to obtain a solidified fiber-reinforced resin.

Next, the surface of this solidified product was polished to be smooth and the mandrel was removed to obtain a spiral strip, and the surface was plated with metal by a conventional method. Next, the upper and lower adjacent surfaces of this spiral strip were sequentially overlapped in a bamboo-shaped manner to a width of 5++++++, and while maintaining this state, heated at 120°C for 30
A bamboo shoot-like substance was obtained by heat treatment for a minute. Gap closing caps were attached to the upper and lower ends of the obtained bamboo shoots in the same manner as in Example 1 to obtain a stretchable protective cover having the same external shape and fiber orientation as in Example 1.

The properties of the bamboo shoot spring-shaped elastic protective cover (made of carbon fiber-reinforced synthetic resin) according to the present invention are shown in the following table in comparison with conventional ones made of steel.

As is clear from the following table, the elastic protective cover of the present invention is lightweight and exhibits good spring resilience, unlike conventional steel covers, and can be compressed with a small compression force.

table

[Brief explanation of the drawing]

FIG. 1 shows an explanatory diagram of the shape of the stretchable protective cover of the present invention. FIG. 2 shows the fiber orientation direction with respect to the longitudinal direction of the stretchable protective cover of the present invention. FIG. 3 shows gap closure caps attached to the upper and lower ends of the elastic protective cover of the present invention. ■...Band-shaped object, 2...Overlapping portion, A...long axis direction of elastic protective cover, B, B'...fiber orientation direction,
θ...Fiber orientation angle, a...Upper end gap closing cap, b...Lower end gap closing cap.

Claims (3)

[Claims] (1) In an elastic protective cover consisting of a bamboo spring having a structure in which an elastic band is wound with a portion of the band overlapping, the elastic band is made of a composite of fibers and synthetic resin. A stretchable protective cover featuring: (2) The stretchable protective cover according to claim 1, wherein the elastic band is made of a thermosetting body made of carbon fiber and thermosetting resin. (3) The upper and lower adjacent surfaces of a spiral strip made of a fiber-reinforced synthetic resin material made of fibers and synthetic resin are stacked in a bamboo shoot shape, and heat treated in this state to fix the bamboo shoot state. A method for manufacturing a stretchable protective cover.