JPS60122030A - Preparation of high speed rotary disc - Google Patents

Abstract

PURPOSE:To prepare a rotary disc made of FRP having the intrinsic strength of the FRP in the prepn. of a concentric disc having a bore hole to be installed in a rotary cylinder of a centrifuge by reinforcing said bored hole. CONSTITUTION:Fibers are wound around a round bar 5 having the same outside diameter as large as the inside diameter of a bored hole of a concentric disc 6 to prepare a ring 6 made of fiber which will serve for forming the bored hole in the succeeding stage. Thereafter, fiber 7 is wound vertically and horizontally around the fiber ring 9, and molded with resin by the similar method as conventional FRP flat plate. Then, the round bar 5 is pulled off to obtain a flat plate provided with a bored hole. The flat plate having a bored hole prepd. by molding by this method is used for a concentric disc 4 in a rotary drum 3 of a centrifuge. Thus, cutting of reinforcing fiber which has been inevitable in the conventional process for preparing a flat disc with a bored hole has become avoidable by this process, and an FRP flat disc with a bored hole without impairing the tensile strength of the fiber is obtd.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a concentric disk provided in a rotating cylinder of a gas centrifuge (hereinafter referred to as a centrifuge), and in particular to a rotating cylinder made of fiber-reinforced plastic. The present invention relates to a centrifugal separator having a barrel.

[Background of the invention]

It is well known that the rotating barrel of conventional centrifuges is made of metal. However, the direction of development of centrifuges is toward higher circumferential speeds, and attention is being focused on fiber-reinforced plastics (hereinafter abbreviated as FRP), which has superior tensile strength to metals, as a material for rotating bodies. Therefore, in manufacturing an FRP centrifuge, the present invention focused on a method of processing holes in a rotating disk.

Figure 1 shows a concentric disk with a hole installed in the rotating cylinder of an FRP centrifuge. This concentric disk is fixed within the rotating cylinder of the centrifuge and has at least one hole l. Furthermore, this hole is essential for circulating the gas supplied into the rotating cylinder. The conventional method for producing FRP boards with holes involves applying fibers vertically and horizontally, molding the board with plastic, and then making through holes with a drill or the like.

The hole member FRP flat plate formed by this method is F
RP cannot exhibit its original tensile strength. This is because the fibers are cut when forming the through hole, and cracks occur from this cut surface. Therefore, when a flat plate with holes formed by the conventional method is installed in a high-speed rotating cylinder, that is, a centrifuge rotating body, cracks occur from the cross section of the holes due to the centrifugal force (tensile stress) caused by rotation. This progresses and leads to the destruction of the flat plate with the hole.

In other words, the centrifuge may be destroyed.

[Purpose of the invention]

An object of the present invention is to reinforce the hole in a concentric disk with a hole provided in the rotating cylinder of a centrifuge.
An object of the present invention is to provide a rotating cylinder made of FRP that has the original strength of RP.

[Summary of the invention]

When manufacturing a conventional rotary flat plate having holes made of FRP, as described above, a flat plate made of FRP is first manufactured and predetermined holes are subsequently machined therein.

Furthermore, in order to reinforce the FRP board itself, a method has been implemented in which fibers are knitted into a mesh shape and then molded with resin. However, even when molded using this method, when forming holes, the fibers must be cut as described above. Considering the tensile strength in the fiber direction of an FRP board molded with fibers applied in one direction, no matter how many fibers are cut in the middle, in terms of tensile strength it is equivalent to having no fibers. In other words, if 30% of the fibers in the FRP board are cut midway, the original FRP
The strength will be reduced by 30% from the tensile strength of the plate. Conventionally, even though this fact was known, the diameter of the hole was extremely small compared to the overall size of FRP. In other words, since the number of fibers to be cut for making holes was extremely small compared to the number of the entire FRP board, it did not pose much of a problem. However, in FRP boards that have one or more holes in the circumferential direction of the flat plate, such as a concentric flat plate with holes installed in the rotating body of a centrifuge, the fibers are cut to form the holes. It is impossible to do so in terms of tensile strength. Therefore, it is preferable to mold the hole without cutting the fibers in the hole. In this method, a fiber ring that will serve as the hole in the concentric disk is manufactured in advance using desired fibers, and this ring is used as the hole in the FR.
It is a flat plate type with a P hole sawn part.

[Embodiments of the invention]

Examples of the present invention will be explained in the second part and with reference to FIG. The method for molding the FRP concentric disk with holes according to this embodiment is as follows. First, as shown in FIG. 2, a round bar 5 having an outer diameter equivalent to the inner diameter of the hole of the concentric disk
Wrap the fiber around.

Here, a ring 6 made of fiber that will later become a hole is manufactured.

Next, from above the fiber ring 6 shown in FIG.
As shown in the figure, fibers 7 are wound vertically and horizontally, and molded with resin in the same manner as conventional FRP boards. After this, by pulling out the round bar 5, a flat plate with holes is obtained. In this method,
A characteristic feature is that a pre-fabricated fiber ring becomes a hole in the flat plate after molding, and the ring also serves as a reinforcing material for the FRPil flat plate (disk).

FIG. 4 shows a cross section of a hole in an FRF flat plate manufactured by this method. The entire plate consists of several fiber layers 8, similar to a conventional FRP board. However, regarding the holes, the fibers 6 are wound in the circumferential direction of the hole diameter, and the fibers 6 are not cut as in the conventional method of hole molding, so the original tensile strength of the FRP board is is maintained. Further, a flat plate with holes formed by such a method is used as a concentric disk in a centrifuge rotating body.

〔Effect of the invention〕

According to the present invention, there is no need to cut the fibers during hole molding, so an FRP flat plate with holes having the tensile strength inherent to FRP can be obtained. F produced by this method
If a flat plate made of RP is used as a concentric disk with a hole in the rotation circle of the centrifuge, a centrifuge with even greater strength can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the rotating body, FIGS. 2 and 3 are explanatory diagrams of a manufacturing method according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of an FRP TA flat plate molded by this method. . 1... Hole, 3... Rotating cylinder, 4... Concentric disc, 5...
··Round bar. $ 1 Figure 22 3rd E

Claims (1)

[Claims] 1. In a high-speed rotating disc made of fiber-reinforced plastic having a hole, when manufacturing the hole of the disc, a ring made of am having a diameter almost the same as the diameter of the hole is manufactured in advance,
A method for manufacturing a high-speed rotating disk, comprising molding the fiber ring to form a hole in the rotating disk.