JPH03196856A - Rotor for centrifugal separator and its production - Google Patents

Abstract

PURPOSE:To enhance peeling strength by laminating woven fabric made of carbon fiber in pseudoisotropy to form a sample housing cavity and winding woven fabric made of carbon fiber on the outer circumference of a main body part to form a reinforcing part and constituting the rotor of both the main body part provided with the sample housing cavity and the reinforcing part. CONSTITUTION:A rotor 10 for a centrifugal separator made of carbon fiber reinforcing composite material is manufactured by providing a plurality of pieces of sample housing cavity 25 symmetrically for a central axis 20. In this case, a main body part 10-1 is formed by laminating woven fabric made of carbon fiber wherein a mold of the cavity 25 is previously drawn out. A reinforcing member 10-2 is formed by winding this woven fabric on the outer circumference of the main body part in a surrounded shape. The main body part 10-1 and the reinforcing member 10-2 are integrally molded by arranging them in the molds 40-1, 40-2 while holding the width of the reinforcing layer at the same thickness as the thickness obtained after molding of the main body part. As a result, the manufacture is made easy and the rotor 10 is manufactured which is durable to high-speed rotation and free from interlaminar peeling in the inside of the main body and between the main body and the reinforcing member.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotor for a centrifuge made of a fiber-reinforced composite material and a method for manufacturing the rotor.

[Conventional technology]

Conventionally, homogeneous materials such as aluminum and titanium have been used in rotors for high-speed centrifuges to increase their ability to carry centrifugal loads, but due to issues such as energy loss, lightweight fiber-reinforced materials have been used. The use of composite materials has evolved.

However, when fiber-reinforced composite materials are used, there is a problem of delamination due to centrifugal force, and in order to prevent this, Japanese Patent Laid-Open No. 58
As stated in Japanese Patent Publication No. 218958 and Japanese Patent Publication No. 34659, a ring (reinforcement part) made of aluminum, titanium, or fiber reinforced composite material was provided around the outer periphery of a central disk (main body part) made of fiber reinforced composite material. .

[Invention or Solution [Problem to be Solved 7] Conventional rotors made of fiber-reinforced composite materials were manufactured by molding and curing the central disk, and then combining and adhering the central disk and a separately prepared outer ring. The process was complicated, and there were problems with the strength of the bonded parts.

That is, according to the method of adhering after molding, it is necessary to form an adhesive layer between the central disk part and the ring part, and peeling occurs in this adhesive layer, resulting in -C.

One object of the present invention is to provide a rotor for a centrifuge made of fiber-reinforced composite material that is easy to manufacture, can withstand high-speed rotation, and has no delamination inside the main body or between the main body and the reinforcing part. It is in.

[Structure of the invention]

The present invention consists of the following configuration.

(1) In a rotor for a centrifuge made of carbon fiber-reinforced composite material, which is provided with a plurality of sample storage cavities symmetrically around the central axis, the rotor has carbon fiber fabrics laminated in a quasi-isotropic manner. a main body portion provided with a sample storage cavity;
A rotor for a centrifuge made of carbon fiber-reinforced composite material, comprising a reinforcing part formed by wrapping a carbon fiber fabric around the outer periphery of the main body.

(2) Pair 1 to the central axis. &. In a method for manufacturing a rotor for a centrifuge made of a carbon fiber-reinforced composite material provided with a plurality of sample storage cavities, a main body member made of laminated carbon fiber fabrics with cavities cut out in advance, and a main body A centrifugal method characterized in that a reinforcing part whose outer periphery is covered with the fabric in a circumferential manner is placed in a mold with the width of the reinforcing layer being the same as the thickness of the main body part after molding, and integrally molded. A method for manufacturing a rotor for a separator.

Such a rotor made of carbon fiber composite material is easy to manufacture and has excellent durability against high-speed rotation.

A rotor for a centrifuge according to the present invention includes a main body portion having a sample storage cavity and a reinforcing portion formed by reinforcing the outer periphery of the main body portion.

The rotor of the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view showing an example of a rotor made of carbon fiber composite material of the present invention.

In FIG. 1, 10-1 is the main body of the rotor, and 102 is a reinforcing portion. FIG. 2 shows a partially enlarged view of the laminated structure of section A in FIG. 1.

FIG. 3 is a cross-sectional view of a portion of FIG. 1 taken along line B-B.

In Fig. 3, 20 is the central axis, and 25 is the central axis 2 of the rotor.
This is a sample storage cavity provided at the points 0 and 2.

The main body portion 10-1 is constructed by laminating carbon fiber fabrics in a pseudo-isotropic manner.

The carbon fiber woven fabric is a plain woven fabric or a satin woven fabric, and preferably uses filaments as the fiber.

By using carbon fiber fabric, it has excellent post-processability and does not generate flakes compared to those using unidirectional materials. Also, it has excellent strength when a bush is inserted.

The reinforcing part 10-2 is made of carbon fiber fabric, and the main body part 10
-1 is arranged in a circular manner around the outer circumference of the device. Reinforcement part jO-1
The preferred thickness range is 5% or less of the rotor diameter. If it is thicker than this, the reinforcing layer is likely to peel off due to centrifugal force during high-speed rotation.

The structure of the reinforcing portion 10-2 may be such that the fiber axis is aligned at 0790 degrees with respect to the rotational axis within the outer circumferential surface of the rotor. This is because it has the effect of preventing the reinforcing portion from elongating and peeling during high-speed rotation.

The main body part 10-1 and the reinforcing part 1f)-2 are integrally molded. The resins used for molding are thermosetting resins such as Epoquin resin, phenol resin, unsaturated polyester resin, and polyimide resin, and thermoplastic resins such as polysulfone resin, polyetherimide resin, and polyether ether ketone resin. It is.

A method for manufacturing a carbon fiber composite material rotor of the present invention will be explained.

Usually, it is molded using a carbon fiber woven prepreg, but if a thermoplastic resin is used as the matrix, it may be molded by interlacing a carbon fiber woven fabric and a resin film. 20-80% by weight of resin before molding
Preferably. Particularly preferably 30 to 50% by weight
It is.

The carbon fiber fabric used as the rotor main body is made by cutting out a sample storage cavity in advance. At this time, the cavity must be cut out at a different angle, taking into consideration the stacking direction.

The carbon fiber fabric used as a reinforcing member is cut into strips having a predetermined thickness after the rotor is formed, and the placement position at the foot is avoided.

In the present 1fj invention, the above-described main body member and reinforcing member are placed in a mold and integrally molded. To mold both together,
There were problems such as the difference in thermal expansion between the main body member and the reinforcing member, and the difficulty in applying pressure uniformly to the reinforcing part.The problem was solved by the following method.

The difference in thermal expansion was resolved by making the width of the laminated reinforcing part the same as the thickness of the main body after molding, and placing it in the mold.

The problem of applying pressure to the reinforcing part was solved by applying pressure to the reinforcing part using the force of the resin flow from the main body. It is preferable to use a carbon fiber fabric because the force of the resin flow can be easily applied to the reinforcing portion, and the resin flow can occur without disturbing the fibers. Air bubbles can be removed by pressurizing the resin flow, and pressure can be applied evenly.

〔Example〕

Example 1 A circular cloth with a diameter of 20.4 cm was cut out from a carbon fiber plain weave cloth impregnated with bisphenol-based epoxy resin, with a sample storage cavity and a rotor drive cone insertion hole cut out. Ta. 101 sheets of this cloth were laminated while shifting the fiber direction of the cloth by 30 degrees.

Next, a reinforcing portion was formed by wrapping the same carbon fiber plain weave cloth that constitutes the main body 10 times around the outer periphery of the main body perpendicular to the laminating direction of the main body. At this time, the width of the plain weave cloth of the reinforcing part was 20 mm, which is the same as the thickness of the main body part after molding.

This laminate was placed in a mold as shown in FIG. 4, the mold was set in a preheated hot press, and after the temperature was raised to the molding temperature, pressure molding was performed. After molding, the molded product was taken out of the mold and post-cured to completely cure it.

The obtained molded article had a main body portion and a reinforcing portion firmly adhered to each other, and had a good appearance.

〔Effect of the invention〕

As explained above, the rotor for a centrifuge of the present invention is composed of a main body portion and a reinforcing portion made of a carbon fiber reinforced composite material, and since both are integrally molded, the rotor has particularly high peel strength.

This is because by compressing the main body part during molding, some of the fibers of the laminated fabrics spread in the outer circumferential direction along with the resin flow, and as a result, the outer reinforcing fabric and the main body fabric are closely integrated. This is due to the fact that there is no intervening single layer of resin as seen in conventional methods.

In the conventional method of bonding after molding, it is difficult to apply pressure from the outer periphery during bonding, so methods such as press-fitting the bonding surface with a tapered shape are used. There was also a risk that the reinforced parts would fall off. However, in the present invention, there is no risk of such falling off.

[Brief explanation of drawings]

FIG. 1 is a plan view of a rotor for a centrifuge, which is an example of the present invention. FIG. 2 is a partially enlarged view of the laminated structure of section A in FIG. 1. FIG. 3 is a cross-sectional view of a portion taken along line BB in FIG. FIG. 4 shows a cross-sectional view of the mold in which the laminate is placed. Explanation of symbols 10: Centrifuge rotor, 10-1: Main body, 10-
2 Reinforcement part, 20: Central axis, 25: Sample container storage cavity, 30: Rotor drive cone insertion hole, 40-1
, : Male type, 40-2 : Female type 1 Fig. Fig. Fig. Fig. 40-1

Claims (2)

[Claims] (1) In a rotor for a centrifuge made of carbon fiber reinforced composite material, which is provided with a plurality of sample storage cavities symmetrically about the central axis, the rotor has a sample storage cavity made of carbon fiber fabrics laminated in a quasi-isotropic manner. A rotor for a centrifuge made of carbon fiber-reinforced composite material, comprising a main body provided with a storage cavity and a reinforcing part formed by wrapping a carbon fiber fabric around the outer periphery of the main body. (2) In a method for manufacturing a rotor for a centrifuge made of carbon fiber-reinforced composite material with multiple sample storage cavities provided symmetrically about the central axis, the main body is made of laminated carbon fiber fabrics with cavities cut out in advance. and a reinforcing member whose outer periphery of the main body member is circumferentially covered with the fabric are placed in a mold with the width of the reinforcing layer being the same as the thickness of the main body after molding, and are integrally molded. A method for manufacturing a rotor for a centrifuge.