JP4673184B2 - Centrifuge rotor - Google Patents

Description

The present invention relates to a centrifuge rotor made from a fiber-reinforced resin molded body.

Centrifuges are commonly used in the fields of engineering, medicine, biology and the like to separate and purify materials of various densities. The centrifuge has a rotor (rotary body) to which a test tube, a sedimentation tube, and the like are attached according to the application, and can rotate several thousand to several tens of thousands of revolutions per minute. Such a centrifuge rotor is light and needs to withstand a high centrifugal force, and thus is generally made of a lightweight metal such as titanium or aluminum, or a fiber-reinforced composite material.

The composite material rotor for a centrifuge is typically made from a plurality of layers of composite material composed of epoxy resin and fiber reinforcement. Composite rotors are tougher and lighter than comparable metal rotors, and in addition, composite rotors drive the centrifuge because they reduce the load on the centrifugal drive unit compared to equivalent metal rotors. There is also an advantage that the life of the motor is long. Then, a method for producing a rotor for a centrifuge by resin transfer molding using a fiber reinforced composite material (for example, Patent Document 1) or a method for press molding using a fiber reinforced resin prepreg (for example, Patent Document) 2) etc. are known.
Japanese Patent Publication No. 2002-504035 JP 2001-179842 A

Since the rotor of the centrifuge must be able to stably withstand ultra-high speed rotation, it is necessary to form a balanced and precise molding at each part. However, when molding a rotor of a centrifuge by press molding using a fiber reinforced resin prepreg, there is a problem that the desired product cannot be obtained unless various kinds of combinations of prepregs are used. there were.

Accordingly, an object of the present invention is to simply provide a fiber reinforced resin centrifuge rotor that can stably withstand ultra-high speed rotation by a single prepreg combination.

The invention described in claim 1 of the present invention is a rotor for a centrifugal separator, wherein the outer peripheral side wall portion is formed from a fiber reinforced resin molded body made of a unidirectionally arranged fiber reinforcing material in which reinforcing fibers are mainly oriented in the circumferential direction. The center boss portion is composed of a fiber reinforced resin molded body in which short fibers are randomly oriented, and includes an inner peripheral portion continuous from the outer peripheral side wall portion to the center boss portion, and an upper end portion of the center boss portion. The boss portion is composed of a fiber reinforced resin molded body made of a reinforcing fiber cloth and / or a unidirectionally arranged fiber reinforcing material, and the outer peripheral side wall portion, the center boss portion, and the inner peripheral portion are integrally bonded to each other. This is a rotor for a centrifuge.

In the invention described in claim 2, the fiber reinforced resin molded body in which short fibers are randomly oriented, which constitutes the upper end portion of the center boss portion, cuts a prepreg composed of strands of unidirectionally arranged fiber reinforcement. The rotor for a centrifuge according to claim 1, wherein the chopped strand prepreg obtained by molding is molded.

According to the present invention, the reinforcing fibers are oriented in the circumferential direction in the outer peripheral side wall portion where the centrifugal force is large, and the reinforcing fiber cloth and / or the unidirectionally arranged fiber reinforcement is provided in the inner peripheral portion where the centrifugal force is medium. In the center boss portion where the material is arranged and only a small centrifugal force is applied, a rotary body (rotor) is obtained from a molded body in which short fibers are randomly oriented at the upper end portion of the boss portion, mainly focusing on moldability. . Since these are integrally molded, a very high reinforcing effect can be brought about by the reinforcing fibers. Thus, according to the present invention, a rotor for a centrifugal separator made of fiber-reinforced resin prepreg that can stably withstand ultra-high speed rotation can be easily obtained by integral molding.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is an explanatory front perspective view of a centrifuge rotor 1 according to the present invention. FIG. 2 is a cross-sectional explanatory view of the centrifuge rotor of the present invention. 1 and 2, 2 is an outer peripheral side wall part, 3 is a center boss part, 4 is an inner peripheral part connected from the outer peripheral side wall part to the center boss part, 5 is an upper end part of the center boss part, and 6 is an upper end part of the center boss part. The boss part other than is shown. In the present invention, the inner peripheral portion means all portions other than the outer peripheral side wall portion and the boss portion.

In this invention, the outer peripheral side wall part 2 is mainly comprised from the fiber reinforced resin molding which consists of a unidirectional array fiber reinforcement with which the reinforced fiber orientated in the circumferential direction. In the present invention, the fiber reinforced resin made of a unidirectionally arranged fiber reinforcing material means a prepreg in which fiber bundles (strands) are arranged in parallel in one direction and are impregnated with a resin. For example, in the case of a carbon fiber bundle, a bundle of 1K to 24K is appropriate. Such a prepreg needs to be arranged so that the fiber axis of the unidirectionally arranged fiber reinforcement coincides with the circumferential direction of the outer peripheral side wall 2. Since a large centrifugal force is applied to the outer peripheral side wall portion, it is possible to withstand a large centrifugal force by arranging the fiber axis in the circumferential direction. Thus, in this invention, the outer peripheral side wall part 2 needs to be mainly comprised from the fiber reinforced resin molded object which consists of a unidirectional array fiber reinforcement with which the reinforcement fiber orientated in the circumferential direction. However, a part of the outer peripheral side wall part, for example, the inner part (the inner surface side of the basket) of the outer peripheral side wall part or the thick part of the outer wall (see 10 in FIG. 3) is a reinforcing fiber cloth. A prepreg made of may be used in combination.

In the present invention, the upper end portion 5 of the center boss portion is composed of a fiber reinforced resin molded body in which short fibers are randomly oriented, and an inner peripheral portion 4 that extends from the outer peripheral side wall portion to the center boss portion, and the upper end portion of the center boss portion. The boss part 6 other than the part 5 is composed of a fiber reinforced resin molded body made of a reinforcing fiber cloth and / or a unidirectionally arranged fiber reinforcing material.

As the fiber reinforced resin molded body in which short fibers are randomly oriented, which constitutes the upper end portion 5 of the center boss portion, a chopped strand prepreg obtained by cutting a prepreg composed of a strand of a unidirectionally arranged fiber reinforcing material is molded. preferable. The chopped strand prepreg is a small piece of prepreg obtained by cutting a unidirectionally arranged strand (fiber bundle) using a resin as a matrix into a fiber length of, for example, about 25 mm to 50 mm.

A fiber-reinforced resin molded body made of reinforcing fiber cloth is formed using a prepreg of reinforcing fiber cloth, and the reinforcing fiber cloth is composed of warp and weft such as plain weave, twill weave, satin weave, etc. In addition to fabrics, fiber bundles are aligned in one direction and formed into a sheet shape, which is uniaxially woven by stitching them in a perpendicular direction with stitch yarns, and a plurality of sheet materials aligned in one direction are stacked at different angles. And multiaxial fabrics stitched with stitch yarns.

In the present invention, as described above, a prepreg made of a unidirectionally arranged fiber reinforcing material in which reinforcing fibers are oriented in the circumferential direction is mainly disposed on the outer peripheral side wall portion 2, and a short fiber is disposed on the upper end portion 5 of the center boss portion. Is placed randomly chopped strand prepreg, prepreg made of reinforcing fiber cloth and / or unidirectionally arranged fiber reinforcement material is placed on the other center boss part and inner peripheral part. They are integrally molded with each other. As a molding method, usual autoclave molding, hot press molding, or the like can be adopted.

In the case of integral molding, the chopped strand prepreg with the short fibers arranged at random in the upper end portion 5 of the center boss part has a fluidity, so it plays a role of so-called pushing allowance, and precise molding processing Is possible.

There is no restriction | limiting in particular as a fiber reinforcement in this invention, Generally, it may be used as a reinforced fiber in a fiber reinforced resin composite material. Specifically, it consists of inorganic fibers, organic fibers, metal fibers, metal-coated fibers, or a mixture thereof, and as inorganic fibers, carbon fibers, graphite fibers, silicon carbide fibers, alumina fibers, tungsten carbide fibers, boron fibers, glass Fiber or the like may be used. In the case of organic fibers, examples include organic fibers such as aramid fibers, high density polyethylene fibers, nylon fibers, and polyester fibers. In the present invention, carbon fibers or graphite fibers having high specific strength and specific elastic modulus are preferred.

In the present invention, the matrix resin impregnated in the fiber sheet or the reinforcing fiber cloth in which the reinforcing fibers are aligned in one direction includes a thermosetting resin or a thermoplastic resin. Examples of the thermosetting resin include epoxy resins, unsaturated polyester resins, phenol resins, vinyl ester resins, cyanate ester resins, urethane acrylate resins, phenoxy resins, alkyd resins, urethane resins, maleimide resins and cyanate ester resins. There are resins selected from prepolymerized resins. These can also be used as one type or a mixture of two or more types. Examples of thermoplastic resins include polypropylene, polysulfone, polyethersulfone, polyetherketone, polyetheretherketone, aromatic polyamide, aromatic polyester, aromatic polycarbonate, polyetherimide, polyarylene oxide, thermoplastic polyimide, and polyamideimide. is there. Two or more of these resins may be used in combination.

Hereinafter, the present invention will be described in detail by way of examples. The example which produced the rotor for centrifuges as shown in FIG. 2 using the metal mold | die of FIG. In addition, in FIG. 3, a mode that the rotor of FIG. 2 is shape | molded in the upside down state is shown.

In the portion 9 of the lower mold 8 shown in FIG. 3 that forms the outer peripheral side wall of the rotor, a prepreg made of a unidirectionally arranged carbon fiber bundle (12K strand) and an epoxy resin is used as a prepreg made of a unidirectionally arranged fiber reinforcing material. 10 were stacked and arranged. And in the thick part 10, 10 sheets of the same prepreg were further added to the 10 laminates. In addition, what is arranged plus may be a prepreg made of reinforcing fiber cloth. In the arrangement, the fiber axes of the unidirectionally arranged fiber reinforcements were arranged so as to coincide with the circumferential direction of the outer peripheral side wall. Then, only one prepreg made of the same reinforcing fiber cloth as described below was laminated only on the portion corresponding to the upper inner surface of the basket.

In FIG. 3, a chopped strand prepreg obtained by cutting a strand of a unidirectionally arranged fiber reinforcing material was charged into and filled in the groove 11 of the lower mold 8 forming the upper end portion of the boss portion of the rotor. As the chopped strand prepreg, the following were used. That is, carbon fiber HTA-12K (800 tex, 12,000 strands, manufactured by Toho Tenax Co., Ltd.), carbon fiber strand prepreg (resin content) in which the long fibers are oriented in one direction and impregnated with epoxy resin. : 40%, basis weight 40 g / m @ 2) was cut to a length of 25 mm using a guillotine type cutting machine.

Next, the lower mold 13 portion (in FIG. 2, the bottom of the rotor) that forms the inner peripheral portion that extends from the outer peripheral side wall portion to the center boss portion, and the 12 portions that form boss portions other than the upper end portion of the center boss portion Arranged a prepreg made of reinforcing fiber cloth. As a prepreg composed of a reinforcing fiber cloth, a plain woven fabric (W-3101 / Q-195, manufactured by Toho Tenax Co., Ltd.) with warp weft made of carbon fiber HTA3K (manufactured by Toho Tenax Co., Ltd., general-purpose grade carbon fiber, 3000 filaments), What was impregnated with an epoxy resin was used (resin content: 40%). Five prepregs were laminated and arranged so that the lamination pattern was (0/90), (± 45), (30/120), (± 45), (0/90).

After that, the upper die 7 is put on, and is heated and cured at a pressure of 80 to 100 kgf / cm 2 and a temperature of 130 ° C. for 2 hours by a hot press, and then cooled and demolded for the centrifuge having the shape shown in FIG. A rotor was obtained.

It is front perspective illustration of the rotor for centrifuges of this invention. It is sectional explanatory drawing of the rotor for centrifuges of this invention. It is explanatory drawing at the time of shape | molding the rotor for centrifuges of this invention using the metal mold | die of an up-and-down division type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Centrifuge rotor 2 Outer peripheral side wall part 3 Center boss part 4 Inner peripheral part connected from outer peripheral side wall part to center boss part 5 Upper end part of center boss part 7 Boss part other than upper end part of center boss part 7 Upper mold 8 Lower Mold 9 Lower mold corresponding part 10 forming outer peripheral side wall part Lower mold part 11 corresponding to thick part of outer peripheral side wall part Lower mold groove 12 forming upper end part of boss part Boss other than upper end part of boss part Lower mold part forming part

Claims (2)

A rotor for a centrifugal separator, wherein the outer peripheral side wall is mainly composed of a fiber reinforced resin molded body made of a unidirectionally arranged fiber reinforcing material in which reinforcing fibers are oriented in the circumferential direction, and the upper end portion of the center boss is made of short fibers. It is composed of a fiber-reinforced resin molded body that is randomly oriented, and the inner peripheral portion that extends from the outer peripheral side wall portion to the center boss portion, and the boss portion other than the upper end portion of the center boss portion are reinforced fiber cloth and / or unidirectional A rotor for a centrifugal separator, comprising a fiber reinforced resin molded body made of an array fiber reinforced material, wherein the outer peripheral side wall portion, the center boss portion, and the inner peripheral portion are integrally bonded to each other. Chopped strand prepreg formed by cutting a prepreg composed of strands of unidirectionally arranged fiber reinforcement, which is a fiber reinforced resin molded body in which short fibers are randomly oriented, constituting the upper end portion of the center boss portion The rotor for a centrifuge according to claim 1.

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