JPH0354401A - Manufacture of large calipers - Google Patents

Abstract

PURPOSE:To make it possible to improve the straightness of a flat plate as a raw material largely by impregnating many carbon fiber tows with a resin at the specific rate of content of fibers, hardening the resin, molding a plate, and constituting a main part with said plate. CONSTITUTION:At first, a flat plate comprising the composite material of carbon fiber is formed by a pultrusion method. Namely, many carbon fiber tows are aligned in the logitudinal direction of the fiber. For this purpose, a tow bobbin is hooked on a creel stand. The tows are made to pass through several guide parts and then made to pass through a resin bath. At this time, an aluminum member which is treated with silane coupling agent is inserted into the core part of the bundle of the carbon fiber tows. Thus, the flat plate as the raw material is formed by pultrusion. The resin which is held in the resin bath can be a thermosetting resin, and a filler and the like are preferably used for epoxy resin. The resin bath is usually kept at room temperature. However, the bath can be heated as required. The carbon fiber twos which are impregnated with the resin at 40 - 70% rate of content of fibers are made to pass through dies which are held at 100 - 200 deg.C and have a recess-shaped cross section at the speed of 0.1 - 1 m/minute. Thus the straightness of the flat plate as the raw material can be improved to a large extent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to a method for manufacturing a large caliper using carbon fiber composite material.

[Conventional technology]

Conventionally, large calipers capable of measuring approximately 1 meter in length were made of stainless steel and weighed approximately 4'k61, making it difficult for one person to handle them. Therefore, it has been proposed to replace the main components of the carp with carbon fiber composite materials for the purpose of reducing the weight of the carp (Utility Model Publication No. 56-77702, Japanese Patent Application Laid-open No. 58-11-53).
No. 01, JP-A No. 59-54901, etc.), but none with sufficient performance has been obtained. The production of large calipers using carbon fiber composite materials can be roughly divided into two types: one in which the material is released by a pultrusion method, and the other in which it is shaped by an autoclave pressurization method. The drawing method has a lower molding cost than the pressing method, and is softer and easier to machine, so the drawing or forming method is becoming more popular for large calipers.

[eA problem that the invention attempts to solve]

When making a large caliper using a carbon fiber composite material flat plate manufactured by the conventional pultrusion method, the straightness of the flat plate itself is not high, so it is necessary to machine it to make it straight.
The load of machining was extremely large and was a major obstacle. Furthermore, when cutting the flat plate to provide the slide grooves, a significant bend b occurs due to the cutting, making machining increasingly difficult.

Against this background, when manufacturing Oinashi vernier calipers using a pultruded carbon m miscellaneous composite material, it is desired to greatly improve the straightness of the flat plate material.

[Means to solve the problem]

That is, the gist of the present invention is that the main part thereof is constituted by a plate formed by impregnating a large number of carbon fiber tows with resin at an IR fiber content of 40 to 70 ml and hardening and molding them through a die having a concave cross-sectional shape. There is a manufacturing method for large calipers.

To explain the present invention more specifically, first, b carbon iii. m Form a composite material flat plate. That is, in order to align a large number of carbon fiber tows in the longitudinal direction of the fibers, a tow bin is hung on a crimp stand, passed through several guides, and then passed through a resin bath. It is also possible to streamline the crill stand work by pinning and doubling every 3 to 10 tows.

In this case, inserting an aluminum member treated with a silane coupling agent into the core of a bundle of carbon fiber tows and pultrusion molding brings about a favorable effect on the straightness of the material plate.

The resin held in the resin tank may be a thermosetting resin,
Among epoxy resins, unsaturated polyester resins, vinyl ester resins, phenolic resins, etc., it is preferable to use a mixture of epoxy resin, filler release agent, and curing accelerator to a certain composition. The resin bath is usually kept at room temperature, but may be heated if necessary.

100 to 200 carbon fiber tow impregnated in this way
A die with a concave cross-sectional shape held at
Pass at a speed of m/min. The length of the die may be several times the length from the die entrance to gel point 1. It is preferable to provide grooves in the die in advance because this improves workability and suppresses the occurrence of bending due to cutting of the molded body. The fiber content is between 40 and 70, which is good! C< is 5
It is best to set the volume to 0 to 60 volume-i[.

〔Example〕

The present invention will be specifically explained below using Examples.

Example 1 Diameter 7μ, strength 3D Q kg/g*” elastic modulus 24
t:/m" Noljl fiber 1fj12 0 0 0 bundled toe 5 toe yarns, 94 yarns, hung on a krill stand, aligned and fed out, epoxy resin, filler, mold release agent, curing accelerator at room temperature. Each of the impregnated yarns was passed through the opening of a die maintained at 150° C. as shown in FIG. 1 at a rate of 3 m/min.

When it came out of the die, it had completely hardened, so it was pulled out by pinching it with a grit bar and cut with a diamond cutter to a length of 1215 m+. The fiber content was 55% by volume. The flat plate was machined to produce the main scale of a large caliper with a scale of 0 to 1000M. The caliper incorporating this main scale is J
! C straight and not curved〈The weight is 1 81 0? It was about half the weight of the conventional stainless steel heavy duty fs6-, and could be easily handled by one person.

Example 2 The same carbon fiber toe and resin as in Example 1 were used. The upper and lower surfaces and both sides of an aluminum flat plate treated with a cytosilane coupling agent were soaked in the resin, and inserted into the core of the carbon fiber male tow. The opening of the die holding the same 150CK as in Example 1 is 13m.
A flat plate was formed by passing it through at a rate of /min. The flat plate was lightweight, straight and had no bends and high dimensional accuracy.

The fiber content was 55 t% by volume.

〔effect〕

The composite molded plate constituting the large caliper obtained by the present invention is
It has very good straightness and is easy to machine, and if the molded plate has grooves from the beginning, the number of workpieces for machining will be reduced, making it possible to reduce manufacturing costs and preventing bending due to cutting. It has features such as lower molding cost than conventional laminating or forming methods, and is easy to machine because it is soft, making it possible to manufacture main scales for large calipers with excellent dimensional accuracy at low cost. It becomes possible to do so.

[Brief explanation of drawings]

FIG. 1 shows a perspective view of a die suitable for use with the present invention. 1...Top half of the die 2...Bottom half of the die/Figure

Claims (1)

[Claims] 1. A large number of carbon fiber tows have a fiber content of 40 to 70% by volume.
A method for manufacturing a large caliper, characterized in that the main part thereof is composed of a plate impregnated with resin and hardened and molded through a die having a concave cross-sectional shape. 2. 2. The manufacturing method according to claim 1, wherein an aluminum member is inserted into the core of a large number of carbon fiber tows.