KR20160113838A

KR20160113838A - Gravity casting machine

Info

Publication number: KR20160113838A
Application number: KR1020150040032A
Authority: KR
Inventors: 권진국
Original assignee: (주) 진양기계
Priority date: 2015-03-23
Filing date: 2015-03-23
Publication date: 2016-10-04

Abstract

Disclosed is a gravity casting device capable of precisely tilting a rotational angle of a mold frame and controlling a rotating speed of the mold frame using a servomotor for tilting. A gravity casting device according to a desirable embodiment of the present invention includes: a casting device body; the rotary frame with a rotary shaft joined to the casting device body and installed to be able to rotate in a vertical direction; a mold unit installed in the rotary frame, composed of a fixed mold and a movable mold, and having an internal cavity; a melting steel bucket unit installed in one side of the fixed mold and temporarily receiving molten steel to be inputted into the cavity; and a rotating unit installed in the casting device body, rotating the rotary frame to enable the molten steel received in the molten steel bucket unit to be inputted into the cavity by gravity, and capable of tilting the rotational angle of the rotary frame and controlling the rotating speed of the rotary frame to control a flow of the molten steel inputted into the cavity.

Description

Gravity Casting Machine {GRAVITY CASTING MACHINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravity casting machine, and more particularly, to a gravity casting machine capable of precisely controlling tilting angle and speed of a mold using a servomotor for tilting.

Generally, a gravity casting machine is a device for temporarily storing a molten metal in a bucket and then rotating a mold frame so that the molten metal is injected into the cavity of the mold frame by gravity to form a desired casting mold. Examples of casting alloys used in such gravity casting machines include aluminum alloys, and calipers for automobile master cylinders and disc brake parts are manufactured.

The conventional gravity casting machine temporarily stores the molten metal in the hot water as described in Korean Patent Registration No. 10-0370891, and then operates the hydraulic cylinder to rotate the mold frame. As a result, the molten metal that has been kept in a horizontal state is inclined in the direction of rotation, and the molten metal stored in the molten metal flows downward in the direction of gravity and is injected into the cavity inside the mold. When all of the molten metal stored in the hot water is injected into the cavity through the injection port, air is injected into the mold frame to sufficiently cool the mold, and then the mold frame is rotated again to the initial state, and then the movable mold is separated from the fixed mold to take out the casting.

However, conventionally, since the mold frame is rotated using the hydraulic cylinder, the rotation angle and the speed can not be precisely controlled. Further, although the rotation angle of the mold frame can be adjusted stepwise, it can not be continuously tilted. As a result, the flow of the molten metal injected into the mold frame of the gravity casting machine may not be smooth and the quality of the casting may deteriorate.

In addition, there is a limitation in effectively cooling the casting mold inside the mold frame only by injecting the air into the mold frame, thereby causing a problem that the speed of the work process is slowed down.

Korean Patent Registration No. 10-0370891 (Mar. 15, 2003)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gravity casting machine capable of precisely and continuously controlling the tilting angle and speed of a mold die of a gravity casting machine.

It is another object of the present invention to provide a gravity casting machine capable of increasing the cooling efficiency of a casting in a mold die of a gravity casting machine.

According to an aspect of the present invention, there is provided a gravity casting machine including: a main body; A rotating frame coupled to the main body so as to be rotatable up and down; A mold part provided in the rotating frame and including a stationary mold and a movable mold and having a cavity formed therein; A molten metal bucket provided at one side of the stationary mold and temporarily storing the molten metal to be injected into the cavity; And a control unit for controlling the rotation of the rotating frame so that the molten metal stored in the molten metal bucket unit is injected into the cavity by gravity and controlling the flow of the molten metal injected into the cavity, And a tilting driving unit capable of controlling the tilting speed.

The rotation driving unit may include a servo motor installed on the main body such that the motor rotation axis is parallel to the rotation frame rotation axis; A first gear fixed to the motor rotation shaft; And a second gear fixed to the rotary frame rotary shaft and meshed with the first gear, and as the first gear and the second gear are engaged and rotated by the rotation drive of the servo motor, And the tilting control of the rotation angle and the speed of the rotation frame coupled to the rotation frame rotation axis can be performed.

The first gear and the second gear may be helical gears.

In addition, the second gear has a larger gear diameter and a larger number of teeth than the first gear.

The apparatus may further include a cooling water supply and cooling unit installed to be connected to the mold unit and supplying cooling water to the stationary mold and the moving mold to cool the casting in the mold unit.

The cooling water supply and cooling unit may include a cooling water supply pipe installed at one side of the rotation frame and supplying cooling water for cooling the casting in the mold part. A first cooling water injection pipe installed between the cooling water supply pipe and the stationary mold to inject cooling water into the stationary mold; And a second cooling water injection pipe installed between the cooling water supply pipe and the movable mold for injecting cooling water into the movable mold.

The apparatus may further include an air supply cooling unit installed to be connected to the mold unit and supplying air to the stationary mold and the movable mold to cool the casting in the mold unit.

The air supply and cooling unit may include an air supply pipe installed on the other side of the rotating frame and supplying air for cooling the casting in the mold unit. A first air injection pipe installed to connect between the air supply pipe and the stationary mold and injecting air into the stationary mold; And a second air injection pipe installed between the air supply pipe and the movable mold to inject air into the movable mold.

The gravity casting machine of the present invention has the following effects.

First, the present invention can precisely and continuously control the tilting angle and speed of a rotary frame provided with a mold part by using a servo motor and a helical gear, and is capable of controlling the rotation speed slowly so that it is injected into a mold part of a gravity casting machine The flow of the molten metal can be smoothly performed, and the quality of the casting can be improved.

Second, since the cooling water (mist) and air are injected into the interior of the stationary mold and the movable mold, the cooling efficiency of the internal casting of the mold can be increased, thereby improving the work process speed .

1 is a front view showing a gravity casting machine according to a preferred embodiment of the present invention.
2 is a plan view showing a gravity casting machine according to a preferred embodiment of the present invention.
3 is a right side view showing a gravity casting machine according to a preferred embodiment of the present invention.
4 is a front view showing a rotation driving unit of the gravity casting machine;
5 is a plan view showing a rotation driving unit of the gravity casting machine.
6 is a view showing a state of engagement between a motor rotation shaft gear and a rotation frame rotation shaft gear;
7 is a view showing an operating state of a gravity casting machine according to a preferred embodiment of the present invention.

Hereinafter, a gravity casting machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

1, 2 and 3 are a front view, a plan view and a right side view showing a gravity casting machine according to a preferred embodiment of the present invention, FIGS. 4 and 5 are a front view and a plan view showing a rotation driving part of a gravity casting machine, 6 is a view showing a state of engagement between the motor rotary shaft gear and the rotary frame rotary shaft gear.

1 to 6, a gravity casting machine 100 according to a preferred embodiment of the present invention includes a main body 110, a rotating frame 120, a mold part 130, a molten metal bucket part 140, A rotation driving unit 150, and a mold cooling unit.

The casting machine main body 110 is provided with four fixing posts 113 in the longitudinal direction at four corners of the lower supporting plate 111 and the upper frame 115 is fixed to the upper ends of the front and rear fixing posts. The left and right spacing of the fixing posts 113 should be set larger than the left and right widths of the pivoting frame 120 to be described later. The fixing post 113 and the upper frame 115 may be formed into a bar shape having a rectangular or circular cross section, preferably a bar shape having a rectangular cross section. In this embodiment, the casting machine main body 110 is manufactured by using a plurality of frames. However, the present invention is not limited to this, and the casting machine main body 110 may be constituted by integrating one frame.

The pivoting frame 120 is formed of a rectangular frame having an internal space for installing the mold part 130. The rotary frame 120 is installed on both sides of the rotary shaft 121 so as to be rotatable up and down by being coupled to the upper frame 115 of the main body 110. [ The rotating shaft 121 of the rotating frame 120 may be rotatably supported by a bearing 123 provided on the upper frame 115 of the main body 110. A fixed mold 131 is fixedly installed on an inner lower side of the rotary frame 120 and a movable mold 133 is installed on the upper side of the fixed mold 131 so as to be movable up and down by a movement guide rod 135. A hydraulic cylinder 137 for vertically moving the movable mold 133 is installed on the upper portion of the rotating frame 120. The lower end of the cylinder rod 137a of the hydraulic cylinder 137 is engaged with the mold plate 138 provided on the upper portion of the movable mold 133. [

The mold part 130 is installed inside the rotating frame 120. The mold part 130 includes a stationary mold 131 and a moving mold 133, and a cavity (not shown) is formed therein. A cavity (not shown) and an injection port 130a are formed on the contact surfaces of the stationary mold 131 and the movable mold 133. The fixed mold 131 is fixed to the lower side of the rotary frame 120 and the movable mold 133 is installed vertically movably by the movement guide bar 135 at the upper portion of the stationary mold 131, . Such a mold part 130 is a mold frame for manufacturing an aluminum casting, which can be understood by a known technique, and thus a detailed description thereof will be omitted.

The molten metal bucket part 140 is provided on one side of the stationary mold 131, and the molten metal for the injection into the cavity is temporarily stored. The molten metal bucket part 140 may be formed in a bucket shape whose top surface is opened to store molten metal introduced from the outside. The outlet side of the molten metal bucket part 140 is connected to the injection port 130a of the mold part 130. The molten metal bucket 140 maintains the horizontal state in the initial state where the molten metal is temporarily stored, and then operates the servo motor 151 to rotate the rotating frame 120 at about 90 degrees from the initial state. At this time, as the molten metal bucket 140 moves to a position higher than the injection port 130a, the molten metal temporarily stored in the molten metal bucket 140 is transferred to the stationary mold 131 and the moving mold 133 in the cavity.

The rotation driving part 150 is installed in the main body 110 and rotates the rotating frame 120 so that the molten metal stored in the molten metal bucket part 140 is injected into the cavity of the mold part 130 by gravity. In particular, the rotation driving unit 150 may control the tilting angle and the rotation angle of the rotation frame 120 provided with the metal mold 130 to adjust the flow of the molten metal to be injected into the cavity.

The rotation driving unit 150 may include a servo motor 151, a first gear 153, and a second gear 155.

The servo motor 151 is installed in the main body 110 such that the motor rotation shaft 152 is aligned with the rotation frame rotation shaft 121. The servomotor 151 may be fixed to the main body 110 by a motor fixing bracket 116 provided on the upper frame 115 of the main body 110. [ The servomotor 151 is a motor that can control its own speed and can control the speed precisely. Since the servo motor 151 is capable of continuous speed control, the response is quick, and the servo motor 151 has excellent immediacy including inversion. Therefore, the servomotor 151 is an important factor that is mainly used as a power generator in an automation system because it has characteristics such as small size, ease of installation, high efficiency, accurate speed and position control, and ease of maintenance.

The first gear 153 is fixed to the motor rotary shaft 152 and the second gear 155 is fixed to the rotary frame rotary shaft 121 to engage with the first gear 153. The diameter D2 of the second gear 155 is formed larger than the diameter D1 of the first gear 153 in order to reduce the rotation speed of the rotating frame 120 by the rotation speed of the servo motor 151, It is preferable that the number of teeth N2 of the second gear 155 is larger than the number of teeth N1 of the first gear 153. [ The first gear 153 and the second gear 155 are made of helical gears. The helical gears are cylindrical gears having helical curves such that the gear teeth 153a and 155a are inclined at an angle with respect to the axial direction. The relative positions of the two axes are parallel to each other like a spur gear. It has the advantage that it can transmit a large force because the length of the contact line is long and smoothly rotate so that vibration noise is small, but it is difficult to manufacture.

The rotary drive unit 150 rotates the rotary frame rotary shaft 121 as the first gear 153 and the second gear 155, which are helical gears, are rotated by rotation of the servo motor 151, The rotation angle and speed of the rotating frame 120 coupled to the frame rotating shaft 121 can be precisely controlled. That is, the rotation driving unit 150 uses the servo motor 151 and the helical gears 153 and 155 to adjust the rotation angle and speed of the rotation frame 120 provided with the molten metal bucket part 140 and the mold part 130 And the rotation speed can be controlled slowly, so that the flow of the molten metal injected into the cavity of the mold part 130 can be smoothly performed.

The mold cooling part serves to cool the casting in the mold part 130. The mold cooling unit may include a cooling water supply cooling unit 160 and an air supply cooling unit 170.

The cooling water supply cooling unit 160 is installed to be connected to the mold unit 130 and supplies cooling water to the stationary mold 131 and the moving mold 133 to cool the casting in the mold unit 130. The cooling water supply cooling unit 160 is installed on one side of the rotation frame 120, specifically, on the left upper side of the rotation frame 120 to supply cooling water for cooling the casting in the mold unit 130 A first cooling water injection pipe 163 for connecting the cooling water supply pipe 161 and the stationary mold 131 to inject cooling water into the interior of the stationary mold 131 and a cooling water supply pipe 161, And a second cooling water injection pipe 165 connected to the movable mold 133 for injecting cooling water into the movable mold 133. The cooling water supply pipe 161 may be composed of a plurality of pipes, and the cooling water stored in the cooling water storage tank (not shown) is supplied through the pipe by driving a pump (not shown). The first cooling water injection pipe 163 has one end connected to the outlet end of the cooling water supply pipe 161 and the other end connected to the interior of the stationary mold 131. A nozzle (not shown) is provided at the other end of the first cooling water injection pipe 163 to inject cooling water into the fixed mold 131 in the form of mist. The second cooling water injection pipe 165 has one end connected to the outlet end of the cooling water supply pipe 161 and the other end connected to the inside of the moving mold 133. In addition, a nozzle (not shown) is provided at the other end of the second cooling water injection pipe 165 so that cooling water is sprayed into the moving mold 133 in a mist form.

The air supply cooling unit 170 is installed to be connected to the mold unit 130 and supplies air to the stationary mold 131 and the moving mold 133 to cool the casting in the mold unit 130. The air supply cooling unit 170 is provided on the other side of the rotation frame 120, specifically, on the upper right side of the rotation frame 120 to supply air for cooling the casting in the mold unit 130 A first air injection pipe 173 for connecting the air supply pipe 171 and the stationary mold 131 to inject air into the interior of the stationary mold 131 and an air supply pipe 171 for connecting the air supply pipe 171 and the stationary mold 131, And a second air injection pipe 175 connected to the movable mold 133 to inject air into the movable mold 133. The air supply pipe 171 may be composed of a plurality of pipes, and air stored in an air storage tank (not shown) is supplied through a pipe by driving a pump (not shown). One end of the first air injection pipe 173 is connected to the outlet end of the air supply pipe 171 and the other end is connected to the inside of the stationary mold 131. A nozzle (not shown) is provided at the other end of the first air injection pipe 173 to inject air into the interior of the stationary mold 131. One end of the second air injection pipe 175 is connected to the outlet end of the air supply pipe 171 and the other end is connected to the inside of the moving mold 133. A nozzle (not shown) is provided at the other end of the second air injection pipe 175 to inject air into the inside of the movable mold 133.

7 is a view showing an operation state of a gravity casting machine according to a preferred embodiment of the present invention.

As shown in Fig. 7, in the initial state, the pivotal frame 120 is held in the vertical direction and the molten metal bucket part 140 is kept horizontal. In this state, the hydraulic cylinder 137 installed on the upper portion of the movable mold 133 is operated to move the movable mold 133 downward, and the injection port 130a is formed on the joint surface of the stationary mold 131 and the movable mold 133, So as to form a closed cavity.

Subsequently, after the molten metal is temporarily stored in the molten metal bucket 140, the servomotor 151 is operated so that the molten metal bucket 140 and the pivoting frame 120, . The direction in which the rotating frame 120 rotates is a direction in which the molten metal bucket portion 140 moves to a position higher than the injection port 130a of the mold portion 130, And about 90 degrees at which the injection port 130a is vertically erected. As the rotating frame 120 is rotated, the molten metal bucket 140, which has been kept horizontal, is tilted in the rotating direction, and the molten metal temporarily stored in the molten metal bucket 140 flows downward in the direction of gravity. That is, the molten metal bucket 140 is moved to a higher position than the injection port 130a and the cavity of the mold 130, and the molten metal stored in the molten metal bucket 140 is moved into the cavity along the injection port 130a by gravity . At this time, it is possible to accurately and continuously control the tilting angle and speed of the rotating frame 120 provided with the mold part 130 by using the servo motor 151 and the helical gears 153 and 155, Can be adjusted. Accordingly, the gravity casting machine 100 of the present invention can smoothly flow the molten metal injected into the cavity of the mold part 130, thereby improving the quality of the casting.

When the molten metal stored in the molten metal bucket part 140 is injected into the cavity inside the mold part 130 through the injection port 130a and then the cooling water and air are supplied to the mold part 130 to cool the casting material. More specifically, the cooling water supplied through the first cooling water injection pipe 163 is injected into the interior of the stationary mold 131, and the cooling water supplied through the second cooling water injection pipe 165 is injected into the interior of the moving mold 133 Lt; / RTI > The air supplied through the first air injection pipe 173 is injected into the interior of the stationary mold 131 and the air supplied through the second air injection pipe 175 is injected into the interior of the moving mold 133 do. By injecting cooling water and air into the interior of the stationary mold 131 and the moving mold 133, it is possible to increase the cooling efficiency for the inner casting of the mold section 130, thereby improving the work process speed.

Subsequently, after sufficiently cooled, the servo motor 151 is operated to rotate the rotating frame 120 back to the initial state, that is, after the fixed mold 131 and the movable mold 133 are positioned on the vertical line, the rotating frame 120 The hydraulic cylinder 137 is operated to move the movable mold 133 upward so as to separate the stationary mold 131 and the movable mold 133 and take out the casting from the mold part 130.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken in conjunction with the present invention. You will understand. It is therefore to be understood that the embodiments described above are in all respects illustrative and not restrictive. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

100: gravity casting machine 110: casting machine main body
120: rotation frame 130: mold part
131: stationary mold 133: movable mold
135: Movement guide rod 137: Hydraulic cylinder
140: molten metal bucket part 150: rotation driving part
151: Servo motor 153: 1st gear (helical gear)
155: second gear (helical gear) 160: cooling water supply cooling section
161: cooling water supply pipe 163: first cooling water injection pipe
165: second cooling water injection pipe 170: air supply cooling section
171: Air supply pipe 173: First air injection pipe
175: Second air injection pipe

Claims

A casting machine body;
A rotating frame coupled to the main body so as to be rotatable up and down;
A mold part provided in the rotating frame and including a stationary mold and a movable mold and having a cavity formed therein;
A molten metal bucket provided at one side of the stationary mold and temporarily storing the molten metal to be injected into the cavity; And
Wherein the rotating frame is rotated so that the molten metal stored in the molten metal bucket portion is injected into the cavity by gravity and the angle of rotation of the rotating frame and the angle of rotation of the rotating frame are adjusted to adjust the flow of the molten metal injected into the cavity. And a tilting driving unit capable of controlling the tilting speed.

The method according to claim 1,
The tilting-
A tilting servomotor mounted on the main body such that a motor rotation axis is parallel to the rotation frame rotation axis;
A first gear fixed to the motor rotation shaft; And
And a second gear fixed to the rotation frame rotary shaft and meshing with the first gear,
The rotating shaft of the rotating frame is rotated as the first gear and the second gear are rotated by the rotation of the servo motor, and the rotating angle and speed of the rotating frame coupled to the rotating frame rotating shaft are controlled to be tilted Wherein the gravity casting machine comprises:

3. The method of claim 2,
Wherein the first gear and the second gear are helical gears.

3. The method of claim 2,
Wherein the second gear has a larger gear diameter and a larger number of teeth than the first gear.

The method according to claim 1,
And a cooling water supply cooling unit installed to be connected to the mold unit and supplying cooling water to the stationary mold and the moving mold to cool the casting in the mold unit.

6. The method of claim 5,
The cooling water supply /
A cooling water supply pipe installed at one side of the rotating frame for supplying cooling water for cooling the casting in the mold part;
A first cooling water injection pipe installed between the cooling water supply pipe and the stationary mold to inject cooling water into the stationary mold; And
And a second cooling water injection pipe installed between the cooling water supply pipe and the moving mold for injecting cooling water into the moving mold.

6. The method according to claim 1 or 5,
And an air supply cooling unit installed to be connected to the mold unit and supplying air to the stationary mold and the movable mold to cool the casting inside the mold unit.

8. The method of claim 7,
The air supply /
An air supply pipe installed on the other side of the pivot frame to supply air for cooling the casting in the mold part;
A first air injection pipe installed to connect between the air supply pipe and the stationary mold and injecting air into the stationary mold; And
And a second air injection pipe installed to connect between the air supply pipe and the movable mold and inject air into the inside of the movable mold.