KR101557451B1

KR101557451B1 - Centrifugal casting mold cooling fan rotor appointed

Info

Publication number: KR101557451B1
Application number: KR1020140037848A
Authority: KR
Inventors: 이준성; 이양창; 송병목
Original assignee: 경기대학교 산학협력단; 권동철
Priority date: 2014-03-31
Filing date: 2014-03-31
Publication date: 2015-10-07

Abstract

The present invention can efficiently cool the mold by supplying air constantly during centrifugal casting of the rotor and prevent defects such as pores in the product during cooling, thereby improving the quality of the product To a mold cooling fan for a rotor centrifugal casting machine.
The present invention is characterized in that the hopper 20 for supplying molten metal to the upper support plate 10 is provided and the upper rotation plate 40 having the upper mold 30 mounted thereon is coupled to the lower portion of the upper support plate 10, A lower rotating plate 60 having a lower mold 50 mounted thereon is vertically movable through a plurality of guide rods 70 and a lower rotating plate 60 is lifted and lowered at a lower portion of the lower rotating plate 60 And a mold core 90 having a rotor core 91 mounted on a lower mold 50. The centrifugal casting machine is attached to the lower portion of the upper rotary plate 40 An upper cooling fan (100) having a plurality of radially projecting cooling fins (110); And a lower cooling fan 200 having a plurality of cooling fins 210 radially protruding from the lower rotary plate 60.

Description

[0001] The present invention relates to a centrifugal casting machine,

The present invention relates to a mold cooling fan for a rotor centrifugal casting machine, and more particularly, to a mold cooling fan for a rotor centrifugal casting machine, more specifically, The present invention relates to a mold cooling fan for a centrifugal casting machine for a rotor, which is capable of improving the quality of a product.

As is known, a rotor is a rotating member in a rotating machine such as a generator, an electric motor, a turbine, and a water turbine.

At this time, an aluminum alloy in which special elements (Cu, Si, Mg, Ni, etc.) are added singly or in combination to the main aluminum is used for the die casting alloy .

The above-mentioned aluminum alloys have improved strength, heat resistance and corrosion resistance in accordance with various kinds of added elements in addition to good plastic workability, high electric and thermal conductivity, and beautiful appearance.

Among aluminum alloys, Al-Si-based, Al-Si-Mg-based, Al-Mg-based and Al-Si-Cu based alloys are also used for die casting.

On the other hand, in the production of a die cast product manufactured by casting an aluminum rotor or a rotor for an electric motor with aluminum alloy or pure aluminum, a high-pressure casting machine is used as a horizontal casting die casting machine.

However, when the molten aluminum molten metal is injected into the mold in a short time, the high porosity of the molten metal increases and the solidification structure becomes uneven Casting defects occur.

For this reason, when the motor rotor or the compressor rotor is manufactured as an example of the rotor for the motor, the efficiency of the compressor or the motor is low.

In other words, pores and bubbles are formed in the end ring or wing portion of the rotor, resulting in unbalance due to eccentricity due to the air inside, deteriorating heat transfer, The durability is lowered and the electric charge is increased, the efficiency of the motor (such as a motor or a compressor) is lowered, the desired torque is not generated, and vibration and noise are generated.

In consideration of this point, recently, a rotor centrifugal casting machine which manufactures a rotor by a centrifugal casting method has been developed.

In general, a rotor centrifugal casting machine rotates a mold at a high speed when a molten metal is injected and solidified, and uses the rotating centrifugal force to distribute the molten metal by the centrifugal force rotating at high speed in the mold, Smooth, and high pressure is applied to the molten metal, so that the structure of the casting is dense and there is no pore. Details of such a rotor centrifugal casting machine are disclosed in Korean Utility Model Registration No. 20-0455627 and Registration No. 10-1146593 of the following patent documents.

1, the upper support plate 1 of the rotor centrifugal casting machine is provided with a hopper 2 for supplying molten metal and an upper rotation plate 4 A lower rotating plate 6 on which a lower mold 5 is mounted is vertically movable and a lower rotating plate 6 is mounted on a lower portion of the lower rotating plate 6, The lower rotating plate 6 and the main rotating shaft 7 are connected to the upper rotating plate 4 via the plurality of guide rods 8 so as to be able to ascend and descend, A mold core 9, on which a rotor core 9a is mounted, is seated on the lower mold 5. At this time, the molten metal is injected into the upper and lower molds 3 and 5 and the mold core 9 through the hopper 2 while the lower mold 5 is lifted, The upper and lower rotary plates 4 and 6 are rotated at a high speed, the rotor is cast by the centrifugal force.

On the other hand, when centrifugal casting a high-temperature molten metal at the time of centrifugal casting of such a rotor, the temperature of the metal mold is greatly increased, and therefore, the metal mold is damaged or deformed prematurely, shortening its service life. To solve this problem, it is necessary to cool the mold at the time of centrifugal casting. Since the mold rotates at a high speed during centrifugal casting, the method of cooling the inside by supplying the cooling water is complicated because the piping installation and sealing are complicated.

Therefore, conventionally, as shown in FIG. 1, a nozzle N is installed in a rotor centrifugal casting machine, and compressed air is directly sprayed on the surface of the mold through the nozzle N to cool the mold.

However, since the mold is cooled by injecting air with the nozzle N in the past, the amount of air injected through the nozzle N is structurally large, so that the product is cooled earlier than the mold and defects such as voids There is a problem that the quality of the product is deteriorated.

Patent Document 1: Registration Utility Model No. 20-0455627 (Sep. 7, 2011) Patent Document 2: Registration No. 10-1146593 (2012.05.09)

It is an object of the present invention to overcome the above-described drawbacks of the prior art, and to provide a method of cooling a mold by more uniformly supplying air to a surface of a mold to which a molten metal is injected during centrifugal casting of the rotor And a mold cooling fan for a rotor centrifugal casting machine.

Another object of the present invention is to provide a mold cooling fan for a centrifugal casting machine for a rotor, which can prevent defects such as potholes in the product from being generated during cooling.

In order to achieve the above object, the present invention is characterized in that a hopper for supplying molten metal to an upper support plate is provided, an upper rotation plate on which an upper mold is mounted is coupled to a lower portion of the upper support plate, Wherein a lower rotating plate is disposed vertically movably through a plurality of guide rods, a spindle rotating plate for moving up and down the lower rotating plate is disposed below the lower rotating plate, and a mold core having a rotor core mounted on the lower mold, And an upper cooling fan protruding radially outward from the upper rotating plate is attached to the upper rotating plate and a radiating fin is formed on the lower rotating plate, And a lower cooling fan having a plurality of cooling fins protruded.

Further, the upper and lower cooling fans are formed with guide holes to be fitted into the guide rods, respectively.

Further, the cooling fin is rotatably connected to the lower part of the upper cooling fan and the upper part of the lower cooling fan by a screw fastening.

The cooling fins are integrally formed on the lower portion of the upper cooling fan and the upper portion of the lower cooling fan.

Further, the upper and lower cooling fans are divided into a plurality of equal portions so as to form predetermined gaps, respectively.

According to the mold cooling fan for rotor centrifugal casting machine of the present invention, the upper and lower molds and the mold core and the product are constantly supplied with air by the upper and lower cooling fans rotating at the same time with the upper and lower rotary plates at the time of centrifugal casting of the rotor Therefore, there is an effect that the air can be uniformly supplied to the upper and lower molds, the mold core, and the product structurally and further efficiently cooled.

In addition, since the supply amount of the air is constant, the upper and lower molds and the mold core and the product are uniformly cooled, and it is possible to prevent defects such as pores in the product from being generated during cooling. There is an effect that quality can be improved.

1 is a sectional view showing a conventional centrifugal casting machine nozzle.
2 is a cross-sectional view of a centrifugal casting machine mold cooling fan of the present invention.
3 is a perspective view of an upper cooling fan according to the present invention.
4 is a perspective view of a lower cooling fan according to the present invention;
5 is a sectional view taken along the line A-A in Fig.
6 is a cross-sectional view taken along the line B-B in Fig.
7A and 7B are bottom views showing the operation of the upper cooling fan according to the present invention when rotating.
8A and 8B are plan views showing the operation of the lower cooling fan according to the present invention when rotating.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the technical structure of the present invention will be described in detail with reference to the accompanying drawings.

2 to 8A and 8B, a mold cooling fan for a rotor centrifugal casting machine according to the present invention includes a hopper 20 for supplying molten metal to an upper support plate 10, The upper rotating plate 40 on which the upper mold 30 is mounted is coupled and the lower rotating plate 60 on which the lower mold 50 is mounted is mounted on the lower portion of the upper rotating plate 40 through the plurality of guide rods 70 A spindle rotary plate 80 for vertically moving and rotating the lower rotary plate 60 is disposed at a lower portion of the lower rotary plate 60 and a mold core 91 having a rotor core 91 mounted on the lower mold 50 And a radiating fin (f3) (f1) formed on the periphery of the upper rotating plate (40) and the spindle rotating plate (80). The rotor centrifugal casting machine An upper cooling fan (100) having a plurality of cooling fins (110); And a lower cooling fan 200 having a plurality of cooling fins 210 radially protruding from the lower rotating plate 60. The lower cooling fan 200 includes a plurality of cooling fins 210 protruding radially.

Here, the mold cooling fan for a rotor centrifugal casting machine of the present invention constantly supplies air to the upper and lower molds 30 and 50 and the mold core 90 and the product during centrifugal casting to efficiently cool the mold. The mold cooling fan is composed of an upper cooling fan 100 and a lower cooling fan 200.

The upper cooling fan 100 is attached to a lower portion of the upper rotation plate 40 and integrally rotates with the upper rotation plate 40 during centrifugal casting of the rotor. (Not shown). The upper cooling fan 100 is fixed to the upper rotation plate 40 through a plurality of bolts B1. The upper cooling fan 100 is formed into a plate-like ring shape having a hole at the center, The upper cooling fan 100 is provided with a plurality of bolt holes 100a through which the bolts B1 are inserted and the upper cooling fan 100 is made of heat resistant metal.

Therefore, the upper cooling fan 100 generates wind through the plurality of cooling fins 110 protruding in a radial direction while rotating integrally with the upper rotating plate 40 during centrifugal casting of the rotor, 50, the mold core 90, and the product.

The lower cooling fan 200 is attached to the upper part of the lower rotation plate 60 and integrally rotates with the lower rotation plate 60 during centrifugal casting of the rotor. (Not shown). At this time, the lower cooling fan 200 is fixed to the lower rotation plate 60 through a plurality of bolts B2. The lower cooling fan 200 is formed in a plate-like ring shape having a hole at the center, The lower cooling fan 200 is formed with a plurality of bolt holes 200a through which the bolts B2 are inserted and the lower cooling fan 200 is made of heat resistant metal.

Therefore, the lower cooling fan 200 generates wind through the plurality of cooling fins 210 radially protruding at a high speed while integrally rotating with the lower rotary plate 60 during the rotor centrifugal casting, 50, the mold core 90, and the product.

According to the present invention, the upper and lower cooling fans 100 and 200 are formed with a plurality of guide holes 120 and 220, respectively, which are inserted into the plurality of guide rods 70. The guide hole 120 of the upper cooling fan 100 is partially opened to the inside and the guide hole 220 of the lower cooling fan 220 is partially opened to the outside do.

As shown in the drawings, the cooling fins 110 and 210 are installed at the lower part of the upper cooling fan 100 and the upper part of the lower cooling fan 200, 230, respectively. When the cooling fins 110 and 210 are rotatably connected to the upper and lower cooling fans 100 and 200 by fastening screws 130 and 230 as shown in FIGS. 7A and 7B and FIGS. 8A and 8B, As the cooling fins 110 and 210 are rotated in the rotating direction about the screws 130 and 230 in accordance with the rotation direction of the upper and lower cooling fins 100 and 200, And cooled.

According to an embodiment of the present invention, the cooling fins 110 and 210 may be integrally formed on the lower portion of the upper cooling fan 100 and the upper portion of the lower cooling fan 200, respectively.

According to the present invention, the upper and lower cooling fans 100 and 200 are divided into a plurality of gaps G1 and G2, respectively. At this time, the upper and lower cooling fans 100 and 200 are preferably divided into three as shown in the drawing, and the gaps G1 and G2 are formed at the center of the guide holes 120 and 220 Division is preferable.

When the upper and lower cooling fans 100 and 200 are divided into a plurality of portions and are attached to each other, predetermined gaps G1 and G2 are formed between the upper and lower cooling pads 100 and 200, It is possible to prevent the upper and lower cooling fans 100 and 200 from being deformed when the molten metal shrinks due to the high temperature and to divide the upper and lower cooling fans 100 and 200 into a plurality of And the lower rotating plate 40 (60).

The molten metal is injected into the upper and lower molds 30 and 50 and the mold core 90 through the hopper 20 while the lower mold 50 is lifted, When the upper and lower rotary plates 40 and 60 are rotated at a high speed (400 to 1200 rpm) through the rotary shaft, the rotor is cast by the centrifugal force.

According to the present invention, the upper and lower cooling fans 100 and 200 attached to the upper and lower rotating plates 40 and 60 during the centrifugal casting simultaneously rotate at high speed and the cooling pins 110 and 210 The upper and lower molds 30 and 50 and the mold core 90 and the upper mold 30 and the lower mold 30 and 50 and the mold core 90 and the product, The product is uniformly cooled by the upper and lower cooling fans (100, 200) rotating at high speed.

Accordingly, the present invention is applicable to the upper and lower molds 30 and 50 by the upper and lower cooling fans 100 and 200 rotating at the same time as the upper and lower rotary plates 40 and 60 during the centrifugal casting of the rotor, The air is uniformly supplied to the mold core 90 and the product so that the air can be structurally supplied to the upper and lower molds 30 and 50 and the mold core 90 and the product in a more efficient manner There is an advantage.

In addition, since the supply amount of the air is constant, the upper and lower molds 30 and 50 and the mold core 90 and the product are uniformly cooled, and defects such as voids It is possible to improve the quality of the product structurally.

10: upper support plate 20: hopper
30: Upper mold 40: Upper rotary plate
50: lower mold 60: lower rotating plate
70: guide rod 80: spindle rotary plate
90: mold core 91: rotor core
100: upper cooling fan 110: cooling pin
120: guide ball 130: screw
200: lower cooling fan 210: cooling pin
220: Guide ball 230: Screw
G1, G2: Clearance

Claims

A hopper 20 for supplying molten metal to the upper support plate 10 and an upper rotation plate 40 to which an upper mold 30 is attached is coupled to a lower portion of the upper support plate 10, A lower rotating plate 60 on which a lower mold 50 is mounted is vertically movable through a plurality of guide rods 70 and a lower rotating plate 60 is lifted and lowered on a lower portion of the lower rotating plate 60 A mold core 90 in which a spindle rotary plate 80 is mounted and a rotor core 91 is mounted on the lower mold 50 and a heat dissipating fin f3 is mounted on the periphery of the upper rotary plate 40 and the spindle rotary plate 80, In the rotor centrifugal casting machine in which the rotor (f1) is formed,
An upper cooling fan (100) having a plurality of cooling fins (110) radially protruding from a lower portion of the upper rotation plate (40) through a plurality of bolts (B1) fastened; And a lower cooling fan (200) having a plurality of cooling fins (210) radially protruding from the upper rotating plate (60) through a plurality of bolts (B2)
Guide holes 120 and 220 are formed in the upper and lower cooling fans 100 and 200 so as to be inserted into the guide rod 70,
The upper and lower cooling fans 100 and 200 are divided into a plurality of gaps G1 and G2, respectively,
And the gaps G1 and G2 are formed at the center of the guide holes 120 and 220, respectively.

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The refrigerator according to claim 1, wherein the cooling fins (110) and (210) are rotatably mounted on the lower portion of the upper cooling fan (100) and the upper portion of the lower cooling fan (200) Wherein the mold cooling fan is connected to the mold cooling fan of the rotor centrifugal casting machine.

The mold cooling fan according to claim 1, wherein the cooling fins (110) and (210) are integrally formed at the lower part of the upper cooling fan (100) and the upper part of the lower cooling fan (200).

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