KR20230019282A - Device for manufacturing carbon wear ring molded body - Google Patents

Abstract

According to the present invention, a winding unit continuously winds carbon fiber prepreg made of a carbon fiber fabric and a thermosetting resin on a cylindrical mandrel, and laminates the carbon fiber prepreg by a set thickness to manufacture a carbon wear ring. When the present invention is used, various expensive equipment such as molding equipment, impregnation equipment, heat treatment equipment, and carbonization equipment are not required to manufacture a carbon-carbon composite wear ring, and the manufacturing costs of the wear ring can be as lowered as that of a bronze wear ring.

Description

Carbon wear ring molded body manufacturing device {Device for manufacturing carbon wear ring molded body}

The present invention relates to an apparatus for manufacturing a carbon wearing molded body.

sheep. A pump for draining or supplying water is installed in the drainage well.

sheep. As shown in FIG. 1, the submersible axial flow pump, which is one of the pumps installed in the drainage field, is composed of a case 2, a motor 3, a shaft 4, an impeller 5, and a wear ring 8.

Inside the sealed case, the motor 3 and the impeller 5 are connected to the shaft 4 on a coaxial line, and the motor 3 rotates the shaft 4 to rotate the impeller 5.

A wear ring (8) supports the shaft (4). The wear ring 8 consists of an impeller wear ring 6 and a case wear ring 7. As shown in FIG. 2 , the impeller wear ring 6 is installed on the outer circumferential surface of the impeller 5 and the case wear ring 7 is installed on the inner circumferential surface of the case 2 . In the state where the case wear ring 7 is stopped, the impeller wear ring 6 rotates together with the impeller 5.

Conventionally, the wear ring 8 was made of bronze. Due to this, it was necessary to periodically replace the worn wear ring 8, and for this purpose, the operation of the pump had to be temporarily stopped.

In order to solve this problem, the present applicant has developed a carbon-carbon composite wear ring, as disclosed in Korean Registered Patent (10-1572913).

However, in order to manufacture such a carbon-carbon composite wear ring, various expensive equipment such as molding equipment, impregnation equipment, heat treatment equipment, and carbonization equipment are required, making it difficult to reduce the manufacturing cost of the wear ring to the level of a bronze wear ring.

Korea registered patent (10-1572913)

In order to solve the above problems, an object of the present invention is to provide a carbon wear ring molded body manufacturing apparatus.

An apparatus for manufacturing a carbon wearing molded body to achieve the above object,

A winding unit that continuously winds and laminates carbon fiber prepregs made of carbon fiber fabric and thermosetting resin into a cylindrical shape and then cuts them to make a carbon wearing preform;

a molding unit for compression molding the carbon wearing preform by applying heat and pressure;

a processing unit for processing the shape of the carbon wear ring preform;

an impregnation unit for densifying the carbon wear ring preform by impregnating and curing the carbon wear ring preform in a thermosetting resin; and

It is characterized in that it comprises a surface treatment unit for surface treatment of the carbon wearing preform.

In the present invention, the winding unit manufactures a carbon wear ring by continuously winding carbon fiber prepregs made of carbon fiber fabric and thermosetting resin on a cylindrical mandrel and stacking them to a set thickness. As a result, unlike products made of existing bronze, the excellent wear resistance, low friction coefficient and thermal expansion coefficient of the carbon composite material can dramatically reduce durability, noise and vibration, and power consumption even when the pump is used for a long time. In addition, since the thickness can be adjusted according to the number of times of winding the carbon fiber prepreg, carbon wear rings of various thicknesses can be manufactured. Thus, manufacturing costs can be reduced and productivity can be improved.

In the present invention, after the winding unit winds the carbon fiber prepreg to make the carbon wear ring preform, the carbon wear ring preform is impregnated with the thermosetting resin through the impregnation unit to improve the density of the carbon wear ring. At this time, the wear resistance is improved by mixing additives having various functions with the thermosetting resin to improve hardness, strength, self-lubrication, etc. of the carbon wear ring, thereby extending the life of the carbon wear ring.

In the present invention, the winding unit has an additive spraying unit, and when winding the carbon fiber prepreg, different types of additives are sprayed for each layer to manufacture the carbon wearing ring. For example, when making impeller wear rings and case wear rings, the rotating friction surface has good strength and hardness as well as self-lubricating properties, so any one of graphite powder, graphene, carbon nanotubes, or a mixture thereof, which is resistant to friction, is used as an additive. The remaining layers are sprayed with metal powder made of any one of copper (Cu), silver (Ag), and metal silicon (Si) or a mixture thereof as an additive so that the remaining layers can buffer the transmitted rotational force and impact force. Due to this, it is possible to manufacture a carbon wear ring with maximized wear resistance.

Using the present invention, various expensive equipment such as molding equipment, impregnation equipment, heat treatment equipment, and carbonization equipment for manufacturing a carbon-carbon composite wear ring is not required, and the manufacturing cost of the wear ring can be reduced to that of a bronze wear ring.

1 is a view showing a submersible axial flow pump.
2 is a plan view of an impeller wear ring and a case wear ring shown in FIG. 1;
3 is a block diagram showing the configuration of an apparatus for manufacturing a carbon wearing molded article according to a first embodiment of the present invention.
4 is a view showing the winding unit shown in FIG. 3;
FIG. 5 is a view showing how a carbon wearing preform is compression molded by the molding unit shown in FIG. 3 .
Figure 6 (a) is a view showing the case where the molding unit is an autoclave device, Figure 6 (a) is a view showing the case where the molding unit is a vacuum bag device.
7 is a view showing the impregnation unit shown in FIG.
8 is a view showing an impregnation unit of an apparatus for manufacturing a carbon wearing molded body according to a second embodiment of the present invention.
FIG. 9 is a view showing a carbon wearing preform impregnated with a thermosetting resin in which additives are mixed with the impregnation unit shown in FIG. 8 .
10 is a view showing an apparatus for manufacturing a carbon wearing molded article according to a third embodiment of the present invention.
FIG. 11 is a view showing a carbon wearing preform to which additives are sprayed by the additive spraying unit shown in FIG. 10 .

Hereinafter, the manufacturing apparatus for manufacturing a molded body for carbon wearing rings according to the first embodiment of the present invention will be described in detail.

As shown in FIG. 3, the carbon wear ring molded body manufacturing apparatus according to the first embodiment of the present invention includes a winding unit 100A, a forming unit 200, a processing unit 300, an impregnation unit 400, and surface treatment. It consists of a unit 500.

[Winding unit (100A)]

The winding unit 100A continuously winds and laminates a carbon fiber prepreg (CP1) made of carbon fiber fabric and thermosetting resin in a cylindrical shape, and then cuts the carbon fiber prepreg (CP2).

Carbon fiber prepreg (CP1) is an intermediate material in which a carbon fiber fabric is impregnated with a thermosetting resin in advance. Carbon fiber fabrics are made by arranging or crossing carbon fibers in one direction. A phenolic resin is used as the thermosetting resin. Carbon fiber prepreg (CP1) is made by impregnating a carbon fiber bundle with a thermosetting resin and then curing it.

As shown in FIG. 4 , the winding unit 100A includes a supply unit 110, a winding unit 120, a heating unit 130, a cutting unit 140, and a support unit 150.

The supply unit 110 supplies the carbon fiber prepreg CP1 wound around the bobbin. The carbon fiber prepreg CP1 supplied from the supply unit 110 is guided while maintaining a constant tension by the guide roller GR.

The winding unit 120 pulls the carbon fiber prepreg CP1 supplied from the supply unit 110 with a constant tension and continuously winds it in a cylindrical shape to laminate it to a set thickness. The winding unit 120 includes a cylindrical mandrel 121 in which the carbon fiber prepreg CP1 is continuously wound in a cylindrical shape, and the carbon fiber prepreg CP1 supplied from the supply unit 110 while rotating the cylindrical mandrel 121. ) It is composed of a rotary drive unit 122 that pulls with a constant tension. A release agent is uniformly applied to the surface of the cylindrical mandrel 121 . The release agent is for easily separating the completed carbon wear ring preform CP2 from the cylindrical mandrel 121, and a general silicone-based lubricant may be used.

The heating unit 130 heats the surface of the carbon fiber prepreg CP1 when winding the carbon fiber prepreg CP1 around the cylindrical mandrel 121 . The heating unit 130 applies hot air to the surface of the carbon fiber prepreg CP1. When hot air is applied, heat is transferred to the resin impregnated in the carbon fiber prepreg CP1 to increase viscosity, thereby increasing adhesion between the carbon fiber prepregs CP1.

The cutting unit 140 is located above the winding unit 120 and cuts the continuously supplied carbon fiber prepreg CP1. When the carbon fiber prepreg CP1 is stacked to a set thickness, the cutting unit 140 cuts the carbon fiber prepreg CP1, and a carbon wearing preform CP2 is made. When the cutting unit 140 cuts the carbon fiber prepreg CP1, the support unit 150 presses the carbon fiber prepreg CP1.

[Forming unit 200]

As shown in FIG. 5, the molding unit 200 compresses the carbon wearing preform CP2 formed by stacking several layers of carbon fiber prepreg CP1 by applying heat and pressure. Even if the winding unit 100A winds the carbon fiber prepreg CP1 by tension, the compression force is weak, so the molding unit 200 additionally compresses the carbon wearing preform CP2 formed from the carbon fiber prepreg CP1. perform molding.

The molding unit 200 for compression molding the carbon wear ring preform CP2 may be an autoclave device, as shown in 6(a). In the autoclave device 200A, the carbon wear ring preform CP2 wound around the cylindrical mandrel 121 is placed on the pedestal 210 and compressed by heating and vacuum pressure. If an internal vacuum is maintained between the laminated carbon fiber prepregs (CP1) using an autoclave device (200A), volatile components generated from the thermosetting resin inside are removed, and several layers of carbon fiber prepregs (CP1) Air bubbles are removed when the are bonded to each other, and a densely bonded carbon wearing preform CP2 can be obtained.

Alternatively, the molding unit 200 for compression molding the carbon wearing preform CP2 may be a vacuum bag device 200B, as shown in FIG. 6(b). The vacuum bag device 200B is composed of a vacuum bag F and a vacuum pump P. The carbon wear ring preform CP2 wound around the cylindrical mandrel 121 is placed in a vacuum bag F, and internal air is removed using a vacuum pump P to compress the carbon wear ring preform CP2.

[Processing unit 300]

The processing unit 300 processes the shape of the carbon wear ring preform CP2 separated from the cylindrical mandrel 121 after compression molding. The processing unit 300 cuts the carbon wearing preform CP2 to a set width, and smoothly processes the inner and outer circumferential surfaces of the carbon wearing preform CP2. On the inner and outer circumferential surfaces of the carbon wearing preform CP2, the beginning and end of the carbon fiber prepreg CP1 protrude. The protruding parts formed on the inner and outer circumferential surfaces of the carbon wearing preform (CP2) are removed to smooth the inner and outer circumferential surfaces.

[Impregnation unit 400]

The impregnation unit 400 impregnates the carbon wearing preform CP2 processed into a set shape into the thermosetting resin R and then hardens it.

The impregnation unit 400 includes an impregnation member 410 for impregnating the carbon wearing preform CP2 into the thermosetting resin R, and a curing member for curing the carbon wearing preform CP2 impregnated with the thermosetting resin R (not shown). ) is composed of

As shown in FIG. 7 , the impregnation member 410 puts the carbon wear ring preform CP2 into the impregnation chamber 411 filled with the thermosetting resin R, heats it, and vacuum-presses it with the vacuum pressure unit 412. Impregnation is carried out at 700 to 1000° C. in an inert atmosphere at a pressure below atmospheric pressure. Then, the thermosetting resin (R) fills the fine voids of the carbon fiber prepreg (CP1) generated when the thermosetting resin (R) is not filled between the carbon fiber fabrics, so that the density of the carbon wearing preform (CP2) can be higher.

The density of the carbon wear ring preform (CP2) before impregnation is about 1.3 to 1.5 g/cm ³ . When the carbon wearing preform CP2 is impregnated with the thermosetting resin R, the density of the carbon wearing preform CP2 can be further increased to 1.4 to 1.7 g/cm ³ .

Meanwhile, after simply applying a thermosetting resin only to the surface of the carbon wearing preform (CP2), after wrapping a heat shrink film or a heat shrink band, it may be transformed into an impregnation unit that can be impregnated by putting it in an oven. When the impregnation unit is modified in this way, the impregnation process is performed in a vacuum or normal pressure atmosphere and a curing temperature of 150 to 200 ° C. Due to this, it is possible to significantly reduce impregnation time and cost.

Meanwhile, as shown in FIG. 8 , the additive (A) may be mixed with the thermosetting resin (R) filled in the impregnation chamber 411 of the impregnation member 410 . When the carbon wearing preform (CP2) is impregnated with the thermosetting resin (R) mixed with the additive (A), as shown in FIG. 9, the additive (A) is filled with the thermosetting resin (R) between the carbon fiber fabrics. Depending on the type of additive (A), the performance of the finished carbon wear ring can be improved.

As the additive (A), any one of metal powder, SiC powder, graphite powder, graphene, and carbon nanotubes or a mixture thereof may be added.

As the metal powder, copper (Cu), silver (Ag), metal silicon (Si), or a mixture thereof may be used. If copper, silver, or metal silicon belonging to soft metals is used, rotational force and impact force transmitted to the wear ring can be buffered. Gold (Au) or platinum (Pt) can also be used, but has a problem in that the price is expensive. Therefore, it is preferable to use copper, silver, or metallic silicon.

In addition, as metal powder, carbon (C), silicon (Si), manganese (Mn), vanadium (V), molybdenum (Mo), tungsten (W), colombium (Cb), cobalt (Co), chromium (Cr) ), titanium (Ti), cerium (Ce), iron (Fe), any one or a mixture thereof may be used. The use of such a metal powder improves the hardness and wear resistance of the wear ring.

SiC powder, graphite powder, graphene, and carbon nanotube also improve the hardness and wear resistance of the wear ring because of their good strength and hardness. In particular, graphite powder, graphene, and carbon nanotubes have good strength and hardness and are resistant to friction because of their self-lubricating properties. Therefore, the wear resistance of the wear ring is further improved.

The curing member (not shown) is cured by heating the impregnated carbon wear ring preform (CP2) at a temperature of 120° C. to 200° C.

By repeatedly performing the impregnation and curing processes, the carbon wearing preform CP2 can be densely densified.

On the other hand, after simply applying the thermosetting resin mixed with the additive (A) only on the surface of the carbon wearing preform (CP2), after wrapping the heat shrink film or heat shrink band, it can be transformed into an impregnation unit that can be impregnated by putting it in an oven. . When the impregnation unit is modified in this way, the impregnation process is performed in a vacuum or normal pressure atmosphere and a curing temperature of 150 to 200 ° C. Due to this, it is possible to significantly reduce impregnation time and cost.

[Surface treatment unit 500]

The surface treatment unit 500 processes the surface of the densified carbon wearing preform CP2. The surface treatment unit 500 is provided with a diamond grinder to smooth the surface of the carbon wearing preform CP2.

Hereinafter, a manufacturing apparatus for manufacturing a molded body for carbon wear rings according to a second embodiment of the present invention will be described in detail. Figure 3 is basically referenced.

A carbon wearing molded body manufacturing apparatus manufacturing apparatus according to the second embodiment of the present invention is composed of a winding unit (100B), a forming unit (200), a processing unit (300), an impregnation unit (400), and a surface treatment unit (500). do. Compared to the first embodiment, in this embodiment, the additive (A) is not mixed with the thermosetting resin (R) in the impregnation unit 400, and the additive injection unit (100B) injects the additive (A) ( 160) is the only difference. Hereinafter, detailed descriptions of the same configurations are omitted, and the same reference numerals are used for the same configurations.

[Winding unit (100B)]

As shown in FIG. 10, the winding unit 100B includes a supply unit 110, a winding unit 120, a heating unit 130, a cutting unit 140, a support unit 150, and an additive injection unit 160. do. Since the supply unit 110, the winding unit 120, the heating unit 130, the cutting unit 140, and the support unit 150 are the same as the winding unit 100A of the first embodiment, detailed descriptions thereof are omitted.

When the carbon fiber prepreg CP1 is wound around the cylindrical mandrel 121 of the winding unit 120, the additive spraying unit 160 sprays the additive A on the surface of the carbon fiber prepreg CP1. When the additive (A) is sprayed onto the surface of the carbon fiber prepregs (CP1), the additive (A) sticks between the overlapping carbon fiber prepregs (CP1). Depending on the type of additive (A), the performance of the finished carbon wear ring can be improved.

When the carbon fiber prepreg CP1 is wound, the additive injection unit 160 injects different types of additives A for each layer of the carbon fiber prepreg CP1 to be wound. The reason why different types of additives (A) can be added to each layer of the carbon fiber prepreg CP1 is that the wear ring is manufactured by winding the carbon fiber prepreg CP1.

For example, when making a carbon wear ring used as the impeller wear ring 6, the additive injection unit 160 is, as shown in FIG. 11, on the outermost circumferential surface facing the rotational friction surface, that is, the case wear ring 7. One or a mixture of graphite powder, graphene, and carbon nanotubes, which have good strength and hardness as well as self-lubrication and are resistant to friction, is sprayed as an additive (A1), and the remaining layers are delivered to the impeller wear ring (6) Metal powder made of any one of copper (Cu), silver (Ag), and metal silicon (Si) or a mixture thereof is sprayed as an additive (A2) to buffer rotational force and impact force.

In the case of making the carbon wear ring used as the case wear ring 6, the additive injection unit 160, opposite to the case of the impeller wear ring 6, graphite powder, Any one of graphene and carbon nanotubes or a mixture thereof is sprayed as an additive (A1), and a metal made of any one of copper (Cu), silver (Ag), and metal silicon (Si) or a mixture thereof is applied to the remaining layer. The powder is sprayed with additive (A2).

In this way, when the carbon fiber prepreg (CP1) is wound according to the type of wear ring to be manufactured, when the additive (A) sprayed is different according to the layer of the carbon fiber prepreg (CP1) to be wound, the completed carbon wear ring wear resistance can be maximized.

1: submersible axial flow pump 2: casing
3: motor 4: axis
5: impeller 6: impeller wear ring
7: casing wear ring 8: wear ring
100A, 100B: winding unit 110: supply unit
120: winding unit 121: cylindrical mandrel
122: rotary drive unit 130: heating unit
140: cutting part 150: support part
160: additive injection unit 200: molding unit
200A: autoclave device 210: pedestal
200B: vacuum bag device 300: processing unit
400: impregnation unit 410: impregnation member
411: impregnation chamber 412: vacuum pressure unit
420: hardening member 500: surface treatment unit
A, A1, A2: Additive CP1: Carbon fiber prepreg
CP2: Carbon Wearing Preform F: Vacuum Bag
GR: guide roller P: vacuum pump
R: thermosetting resin

Claims (5)

A winding unit that continuously winds and laminates carbon fiber prepregs made of carbon fiber fabric and thermosetting resin into a cylindrical shape and then cuts them to make a carbon wearing preform;
a molding unit for compression molding the carbon wearing preform by applying heat and pressure;
a processing unit for processing the shape of the carbon wear ring preform;
an impregnation unit for densifying the carbon wear ring preform by impregnating and curing the carbon wear ring preform in a thermosetting resin; and
A carbon wearing molded body manufacturing apparatus comprising a surface treatment unit for surface treatment of the carbon wearing preform. The method of claim 1, wherein the winding unit,
a supply unit continuously supplying the carbon fiber prepreg;
a winding unit that pulls the carbon fiber prepreg supplied from the supply unit with a constant tension and continuously winds the carbon fiber prepreg in a cylindrical shape to laminate it to a set thickness;
a heating unit for heating a surface of the carbon fiber prepreg when the carbon fiber prepreg is wound on the winding unit; and
A carbon wearing molded article manufacturing apparatus comprising a cutting unit for cutting the continuously supplied carbon fiber prepreg. According to claim 1, In the impregnation unit, the carbon wear ring molded body manufacturing apparatus characterized in that the additive is mixed with the thermosetting resin. [Claim 4] The apparatus of claim 3, wherein the additive is any one of metal powder, SiC powder, graphite powder, graphene, and carbon nanotube, or a mixture thereof. The method of claim 1, wherein the winding unit,
a supply unit that continuously supplies the carbon fiber prepreg;
a winding unit that pulls the carbon fiber prepreg supplied from the supply unit with a constant tension and continuously winds the carbon fiber prepreg in a cylindrical shape to laminate it to a set thickness;
a heating unit for heating a surface of the carbon fiber prepreg when the carbon fiber prepreg is wound on the winding unit;
a cutting unit for cutting the continuously supplied carbon fiber prepreg; and
An apparatus for manufacturing a carbon wearing molded article comprising an additive spraying unit for spraying an additive on the surface of the carbon fiber prepreg.

Images