WO2015093709A1

WO2015093709A1 - Rotor casting apparatus having slide-controlled venting function, rotor cast therewith, and method for casting same

Info

Publication number: WO2015093709A1
Application number: PCT/KR2014/007286
Authority: WO
Inventors: 강창석; 김영찬; 최세원
Original assignee: 한국생산기술연구원
Priority date: 2013-12-17
Filing date: 2014-08-06
Publication date: 2015-06-25
Also published as: CN105008067A; KR20150070524A; JP6117428B2; JP2016516589A; CN105008067B; KR101551809B1

Abstract

A rotor casting apparatus (10) according to the present invention comprises: a die assembly (100) into which the core (C) of a rotor (R) is inserted and molten metal is injected; a venting means (200) for controlling and venting the air in the interior of the die cavity of the die assembly (100) by means of a slide method prior to pouring into the interior of the die assembly (100); and a pressing unit assembly (300) for applying pressure on the molten metal filling the die assembly (100). The present invention has the benefit of enhancing the cast quality of the rotor by controlling and venting the air in the interior of the die cavity by means of the slide method before pouring to cast the rotor.

Description

Rotor casting device with slide controlled vent function, rotor using the same and casting method

The present invention relates to a rotor casting apparatus and method, and more particularly, a slide that can improve the casting quality of the rotor by sliding and venting the air in the mold cavity before injection of the molten metal for casting the rotor. The present invention relates to a rotor casting apparatus having a controlled vent function, a rotor using the same, and a casting method thereof.

Rotor is a generic term for a rotating part of an electric motor or a generator, and this rotor will be described with reference to FIGS. 1 and 2. 1 is a conceptual diagram illustrating a core of a general rotor, and FIG. 2 is a conceptual diagram illustrating a rotor having upper and lower end rings formed by casting aluminum molten metal on the core illustrated in FIG. 1.

As shown in FIG. 1, the core C is formed by stacking a plurality of iron cores C1 having a plurality of slots C2. After the core C is placed in a predetermined mold (not shown), the molten metal is injected, and the molten metal is cured while passing through the slot C2 to form the rotor R as shown in FIG. 2. At this time, the rotor (R) has a form in which the upper end ring (C3) and the lower end ring (C4) is formed in the upper and lower portions of the iron core (C1), or the upper end ring (C3) and / or lower as shown in FIG. It may have a form without the end ring (C4).

Conventional techniques for casting the rotor (R) include a centrifugal casting method using a centrifugal casting machine, a vertical high pressure casting method using a vertical injection method, a horizontal high pressure casting method using a horizontal injection method.

Rotor manufacturing method using the centrifugal casting method shows a high filling rate and excellent efficiency, but there is a problem that can not be applied universally.

In addition, the vertical high pressure casting method using the vertical injection method has a high production capacity and is widely used at present, but in-gate injection of the molten metal is biased on one side, and bubbles are distributed in an isolated part of the rotor without the in-gate. Accordingly, there is a problem that an imbalance of the rotor occurs, thereby generating vibration noise and lowering efficiency. In addition, since the amount of runner is very large, there is a problem in that the production cost is high, such as the amount of aluminum consumed is increased and the cost of remelting increases.

On the other hand, the horizontal high-pressure casting method using a horizontal injection method can use a low-cost equipment and the amount of aluminum consumed to produce a rotor with a low production cost, but there is a problem of having a low filling rate compared to other manufacturing methods.

The present invention was devised to solve the above-described problems, and slide controlled vent function that can improve the casting quality of the rotor by controlling and venting the air in the mold cavity by a slide method before injection of the molten metal for casting of the rotor. It is an object of the present invention to provide a rotor casting apparatus having a rotor and a rotor using the same and a casting method thereof.

In order to achieve the above object, the present invention provides a mold assembly in which a rotor core is inserted to inject molten metal, and a vent for controlling and venting air inside the mold assembly by a slide method before injecting the molten metal into the mold assembly. And a pressurizing part assembly for pressurizing the molten metal filled in the mold assembly, wherein the vent means includes a vacuum pump for discharging air in the mold assembly to the outside and an inside of the mold assembly. And a vent valve for selectively sealing a communication line of the vacuum pump, a taper block in surface contact with a tapered surface formed on one side of the vent valve, and the taper block being moved downward to move the vent valve in a slide manner. And a lifting member for moving.

In addition, according to the present invention, the mold assembly comprises a hollow mold body into which the core is inserted, a first end forming portion installed at one side of the mold body and used to form one side of the rotor, and the mold. It is installed on the other side of the main body is characterized in that it comprises a second end forming portion used to move in accordance with the operation of the vent valve to form the other side of the rotor.

In addition, according to the present invention, the pressing unit assembly includes a take-out cylinder for pushing out the rotor is completed casting, and a drive for driving the take-out cylinder, the second end forming portion is a portion of the vent valve is inserted And a vent valve insertion hole.

In addition, according to the present invention, the vent valve has an outer diameter fitted to the vent valve insertion hole, extending out of the vent valve insertion hole and in close contact with the other side of the core to the upper end ring of the rotor on the circumferential surface It characterized in that it comprises a tapered portion for forming a predetermined space for forming, and the passage through which the ejection cylinder can be inserted.

In addition, according to this invention, the tapered block is characterized in that it comprises a tapered portion corresponding to the tapered surface and the engaging portion coupled to the end of the elevating member so as to be in surface contact with the tapered surface.

In addition, according to the present invention, the elevating member is characterized in that it comprises an actuator for driving the tapered block in the vertical direction, and a housing for accommodating the actuator.

In addition, according to the present invention, the first end forming portion is characterized in that it has a predetermined space for forming the lower end ring of the rotor in close contact with the one side of the core.

In addition, according to the present invention, the second end forming portion is characterized in that it has a predetermined space for forming the upper end ring of the rotor in close contact with the other side of the core.

In addition, according to the present invention, the first end forming portion may include a sealing member for sealing one end of the mold body, an injection hole for penetrating the sealing member to inject molten metal into the mold body, and an air discharge hole. It is characterized by including.

In addition, according to the present invention, the pressing unit assembly further includes a plurality of squeeze cylinders driven by the driving unit to pressurize to improve the filling rate of the upper end ring, and the second end forming unit includes the plurality of squeeze cylinders It characterized in that it further comprises a plurality of squeeze cylinder insertion hole is inserted.

According to the present invention, the vent valve further includes a flange having the tapered surface, and the flange further comprises a plurality of squeeze cylinder insertion holes into which the plurality of squeeze cylinders are inserted.

In addition, according to the present invention, the tapered portion is characterized in that the take-out cylinder through hole of the long hole form through which the take-out cylinder penetrates, and a plurality of squeeze cylinder through hole of the long hole form through which the plurality of squeeze cylinders are further formed. do.

In addition, the rotor of the present invention for achieving the above object is characterized by being cast by a rotor casting device having a slide controlled vent function configured as described above.

In addition, the casting method of the rotor of the present invention for achieving the above object, the second end forming portion of the mold assembly formed by spaced apart from the other side of the mold main body and the communication of the vacuum pump formed. Venting the air inside the mold assembly through a line, sealing the other side of the mold body with the second end forming portion using the vent valve actuated by the elevating member; Injecting and pressing molten metal to cast the rotor, and the ejection cylinder is advanced to take out the rotor.

The present invention has the advantage that the casting quality of the rotor can be improved by venting by controlling the air in the mold cavity in a slide manner before injection of the melt for casting of the rotor.

1 is a conceptual diagram showing a core of a general rotor,

FIG. 2 is a conceptual view illustrating a rotor having upper and lower end rings formed by casting aluminum molten metal on the core illustrated in FIG. 1;

Figure 3 is a perspective view showing the appearance of a casting machine having a rotor casting device having a slide controlled vent function according to the present invention,

4 and 5 are an exploded perspective view and an exploded perspective view showing the configuration of the rotor casting apparatus having a slide control vent function according to an embodiment of the present invention,

6 to 11 are conceptual views showing the procedure of casting the rotor by the casting apparatus of the present invention,

Figure 6 shows the state before the operation of the vent means capable of venting the air inside the mold cavity,

7 shows a state capable of casting by the operation of the vent means by the injection pressure of the molten metal,

8 shows a state filled as the molten metal is injected,

9 shows a state in which the squeeze cylinder is operated to improve the filling rate,

10 shows a state in which the molten metal injection unit is separated,

11 shows a process of extracting the rotor cast into the ejection cylinder,

12 and 13 are cross-sectional views of a conventional casting method and an upper end ring of a rotor cast by the casting method of the present invention, respectively.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 3 is a perspective view showing the appearance of a casting machine having a rotor casting device having a slide controlled vent function according to the present invention. The rotor casting apparatus according to this embodiment is installed inside the casting machine 1 composed of a plurality of divided molds as shown in FIG. 3. However, since the casting device 1 is a generalized structure, a description thereof will be omitted, and a description will be given mainly on the configuration relationship of the rotor casting device installed therein.

4 and 5 are exploded perspective and exploded perspective view showing the configuration of the rotor casting apparatus having a slide control vent function according to an embodiment of the present invention.

As shown in Figures 1 to 5, the rotor casting apparatus 10 according to this embodiment is a mold assembly 100 is inserted into the core (C) of the rotor (R) to inject molten metal, a mold assembly (100) Vent means 200 for controlling and venting the air in the mold cavity of the mold assembly 100 by the slide method before the molten metal is injected into the inside, and the pressing unit assembly for pressing the melt filled in the mold assembly 100 And 300.

The mold assembly 100 has a hollow cylindrical mold body 110 into which the core C is inserted, and a first end portion provided on one side of the mold body 110 to form one side of the rotor R. It is composed of a forming portion 120 and the second end forming portion 130 is provided on the other side of the mold main body 110 to be used to form the other side surface of the rotor (R).

The first end forming part 120 is used to form one side of the rotor (R) by being in close contact with one side of the core (C) while sealing one side of the mold main body (110), and fixed to the contact portion. When configured to have a space is also used for forming the lower end ring (C4) of the rotor (R). That is, the first end forming portion 120 also serves as a lower end ring forming portion.

The second end forming portion 130 is used to form the other side of the rotor R by being in close contact with the other side of the core C while selectively sealing the other side of the mold main body 110. When configured to have a certain space in the part is also used for forming the upper end ring (C3) of the rotor (R). That is, the second end forming portion 130 also serves as an upper end ring forming portion.

Therefore, in this embodiment, an example of a configuration relationship capable of casting the rotor R having the lower end ring C4 and the upper end ring C3 will be described.

To this end, the pressing unit assembly 300 includes a plurality of squeeze cylinders 320 inserted into the second end forming unit 130, a blowout cylinder 330 for pushing out the cast rotor R, and a blowout cylinder. 330 and the driving unit 310 for driving the plurality of squeeze cylinder 320 is configured.

By such a configuration, the squeeze bar is protruded to a part of the rotor R (in this embodiment, the upper end ring), and the squeeze cylinder 320 is pressurized to improve the filling efficiency of the molten metal. To this end, the squeeze cylinder 320 is inserted into only a partial region instead of penetrating through the second end forming unit 130, and molten metal filled in the remaining region is injected to form a squeeze bar. Thereafter, the squeeze cylinder 320 is pressed against the squeeze bar. This will be described later.

On the other hand, the second end forming portion 130 is formed to penetrate the central portion of the insertion portion main body 131 and the insertion portion main body 131 of the cylindrical shape sealing the other end of the mold main body 110 will be described later A vent valve insertion hole 133 through which a part of the vent valve 210 of the means 200 can be inserted, and a insertion part main body 131 are formed around the central portion of the insertion part main body 131 to provide a plurality of vent valve insertion holes 133. The squeeze cylinder 320 includes a plurality of squeeze cylinder insertion hole 132 to be inserted.

Meanwhile, in this embodiment, the mold main body 110 is provided with a hollow cylindrical shape, but has a pipe shape in which left and right ends are open. In addition, the second end forming portion 130 is shown to have an insertion portion main body 131 covering the right opening in the drawing of the mold main body 110. At this time, the squeeze cylinder insertion hole 132 and the vent valve insertion hole 133 pass through the insertion part main body 131.

However, the second end forming portion 130 is intended to block one side of the mold main body 110 while allowing the squeeze cylinder 320 and the ejection cylinder 330 as described above to be inserted. As long as it achieves, even if the second end forming portion 130 is integrally formed in the mold body 110 or has a different shape, it should be understood that all fall within the scope of the present invention.

Meanwhile, in this embodiment, the step portion 131a protrudes from the insertion part main body 131 toward the mold main body 110 and is inserted into the mold main body 110, and then the squeeze cylinder insertion hole 132 and the vent are formed. The valve insertion hole 133 is formed to pass through the step 131a is shown.

At this time, the squeeze cylinder 320 is not inserted into the entire region of the squeeze cylinder insertion hole 132 (that is, up to the end of the mold main body 110 side of the squeeze cylinder insertion hole 132), as described above. Insert only up to the middle, for example, so that the rest of the area is empty. Here, the molten metal is injected into the remaining empty area to form a squeeze bar, and the squeeze cylinder 320 presses the formed squeeze bar.

In addition, the first end forming part 120 is a sealing member 121 for sealing one end of the mold main body 110 and injection to penetrate the sealing member 121 so that the molten metal is injected into the mold main body 110 side. It comprises a hole 122, and the air discharge hole 123. At this time, the sealing member 121 is configured such that the inner portion has a predetermined internal space, the lower end ring (C4) of the rotor (R) is formed by the molten filler is filled there. By the way, in the case of the rotor R which does not need the lower end ring C4, the sealing member 121 may be comprised by disk-shaped disk.

In this embodiment, it is shown that the sealing member 121 of the first end forming portion 120 covers the left opening in the drawing of the mold main body 110. In addition, it illustrates that nine injection holes 122 and one air discharge hole 123 is formed through the sealing member 121.

However, as described above, the first end forming part 120 is intended to allow molten metal to be injected into the mold main body 110 and to form one side of the rotor R. As long as such an object is achieved, Even if the sealing member 121 of the first end forming part 120 is formed separately from the mold body 110 or integrally formed in the mold body 110 as illustrated, all of the sealing members 121 belong to the scope of the present invention. Of course. On the other hand, the injection hole 122 may be formed of four to twelve.

The vent means 200 vents the air in the mold cavity of the mold assembly 100 to the outside before injecting the molten metal into the mold assembly 100, and discharges the air in the mold assembly 100 to the outside. The vacuum pump (not shown), the vent valve 210 for selectively sealing the communication line of the vacuum pump and the interior of the mold assembly 100, and the taper block 220 in surface contact with one side of the vent valve 210 ), And the elevating member 230 for moving the vent valve 210 in a slide manner by moving the tapered block 220 downward.

The vent valve 210 is integrally operated while being fitted to the second end forming portion 130 of the mold assembly 100. Accordingly, the vent valve 210 has an outer diameter fitted to the vent valve insertion hole 133 of the second end forming part 130, and not only has a taper portion 211 at one end thereof, but also has a blowout cylinder therein. 330 is configured to have a passage 212 that can move. In addition, the vent valve 210 has a flange 214 having a tapered surface 213 in surface contact with the tapered portion 221 of the tapered block 220 on the other side. Here, the squeeze cylinder insertion hole 215 into which the squeeze cylinder 320 is inserted is further formed in the flange 214.

On the other hand, the tapered portion 211 extends in the direction of the core C side from the end of the vent valve insertion hole 133 to fix the core (C). Thus, a space is formed around the tapered portion 211 to form the upper end ring C3 of the rotor R by filling the molten metal.

On the other hand, in this embodiment, the tapered portion 211 is formed at the end of the vent valve 210 extending from the end of the vent valve insertion hole 133, the end of the tapered portion 211 is the core (C). It is in close contact with the other side of the However, when the taper portion 211 is not provided, the end of the second end forming portion 130 is in close contact with the other side of the core C to fix the core C.

The tapered portion 211 is intended to provide a space for forming the upper end ring (C3) of the rotor (R) while pressing and fixing the core (C) as described above, As long as the taper portion 211 has a different shape as long as the above object is achieved, it is natural to fall within the scope of the present invention.

The tapered block 220 is coupled to the tapered portion 221 corresponding to the tapered surface 213 and the end of the elevating member 230 to be in surface contact with the tapered surface 213 of the vent valve 210. It is configured to have a coupling portion 222. In addition, the tapered portion 221 is provided with a through-hole take-out cylinder 223 having a long hole shape through which the take-out cylinder 330 passes, and a plurality of squeeze cylinder through-holes 224 having a long hole through which the squeeze cylinder 320 penetrates. do. At this time, the through

holes

223 and 224 are formed to have a sufficient length so as not to be caught by the

cylinders

330 and 320 even if the tapered block 220 is moved up and down.

Meanwhile, the taper block 220 is intended to move the vent valve 210 in a slide manner according to the operation of the elevating member 230. As long as the taper block 220 achieves this purpose, the tapered block 220 may have a different shape. Even if it is equipped, it belongs to this scope of course.

The elevating member 230 may include an actuator (not shown) for driving the tapered block 220 in the vertical direction, and a housing 231 for accommodating the actuator. Here, the actuator is a generic term for allowing the tapered block 220 to be operated in the vertical direction. For example, a commonly used hydraulic or pneumatic cylinder actuator can be used. Alternatively, a mechanical actuator such as a gear capable of gear coupling with the tapered block 220 to move the tapered block 220 in the vertical direction may be used. Alternatively, an electric actuator such as a motor can be used.

Therefore, it should be understood that the actuators of the present invention are all within the scope of the present invention regardless of their kind as long as the taper block 220 can be moved in the vertical direction.

In this embodiment, the rod 232 of the actuator is coupled to the engaging portion 222 of the tapered block 220 in a state in which the actuator is embedded in the thick plate-like housing 231. However, this is merely an example for explaining the present invention, and it is obvious that all of the actuators belong to the scope of the present invention even if the actuator is mounted outside of the housing 231 rather than in a manner embedded in the housing 231. .

On the other hand, the vent in the mold assembly 100 according to this embodiment is made by a vacuum pump. Here, the vent line of the vacuum pump may include an air discharge hole 123 of the first end forming part 120, a through hole in the center of the core C, and a gap between the mold main body 110 and the second end forming part 130. Is formed by. Therefore, the vent by the vacuum pump is made before the molten metal is injected into the mold assembly 100, that is, the mold body 110 and the second end forming unit 130 are not in close contact with each other. As it is injected, the mold main body 110 and the second end forming part 130 are not made in close contact with each other by the above operating principle. That is, the present invention vents the air inside the molten metal before the molten metal is injected into the mold assembly 100, and adheres each component in a form in which casting is possible using the slide principle at the molten metal injection time.

On the other hand, the driving unit 310 of the pressing unit assembly 300 may include an actuator (not shown) for driving the ejection cylinder 330 and the squeeze cylinder 320, and a housing 311 for accommodating the actuator. Here, the actuator is a generic term for allowing the ejection cylinder 330 and the squeeze cylinder 320 to be moved back and forth. For example, a commonly used hydraulic or pneumatic cylinder actuator can be used. Alternatively, mechanical actuators, such as gears, which are geared to the

cylinders

320 and 330 to advance and retract the

cylinders

320 and 330, may be used. Alternatively, an electric actuator such as a motor can be used.

Therefore, it should be understood that the actuators of the present invention are all within the scope of the present invention, regardless of their kind, as long as they can advance each

cylinder

320, 330.

In this embodiment, it is shown that the actuator is embedded in a thick disk-shaped housing 311. However, this is merely an example for explaining the present invention, and it is natural that the actuator is included in the scope of the present invention even when the actuator is installed outside the housing 311, for example, rather than in the manner of being embedded in the housing 311. .

By the casting apparatus 10 of this invention demonstrated above, the rotor R can be cast and manufactured in the state which vented the air in the inside of the metal mold assembly 100. FIG.

Hereinafter, a method of casting the rotor R by using the casting apparatus 10 of the present invention will be described with reference to FIGS. 6 to 11.

6 to 11 are conceptual views showing the procedure of casting the rotor by the casting apparatus of the present invention, Figure 6 shows a pre-operation state of the vent means capable of venting the air inside the mold cavity, Figure 7 is the injection pressure of the molten metal Figure 8 shows a state capable of casting by the operation of the vent means by, Figure 8 shows the filling state as the molten metal is injected, Figure 9 shows the operating state of the squeeze cylinder to improve the filling rate, Figure 10 shows the molten metal injection portion separated 11 shows a process of extracting the rotor cast into the ejection cylinder.

The rotor casting method of this invention is a method of casting a rotor using the rotor casting apparatus 10 which has the slide control vent function of this invention mentioned above. On the other hand, the rotor casting device 10 of the present invention is initially made in a state that the mold main body 110 and the second end forming portion 130 is not in close contact with each other.

The present invention includes a vent step of venting the air therein before the molten metal is injected into the mold assembly 100 (see FIG. 6). To this end, a vent line leading to a gap between the air discharge hole 123 of the first end forming part 120, the through hole in the center of the core C, and the mold main body 110 and the second end forming part 130 is formed. The air is vented through a vacuum pump.

Then, when a signal into which the molten metal is injected into the molten metal injection unit is transmitted to the vacuum pump and the lifting member 230, the vacuum pump stops further operation, and the lifting member 230 operates to move the taper block 220. Move downward As the taper block 220 moves downward in this way, the tapered portion 221 pushes the tapered surface 213 of the vent valve 210 gradually. Therefore, the vent valve 210 and the second end forming portion 130 are moved at the same time, the second end forming portion 130 is in close contact with the mold main body 110 to seal the other side of the mold main body 110, The end of the vent valve 210 is in close contact with the other side of the core (C) to fix the core (C) (see FIG. 7). That is, the sealing step as described above is performed after the vent step.

Meanwhile, a preliminary step of inserting the core C into the mold body 110 may be performed before the venting step. In addition, before performing the vent step of venting the air with a vacuum pump may further comprise a molten metal manufacturing step for producing a molten metal. At this time, the molten metal is used with a purity of 99.5% or more and the molten aluminum of the molten aluminum was found to be preferable as a result of many experiments 700 to 750 ℃.

In addition, the present invention includes an insertion step of inserting the squeeze cylinder 320 only to a partial region of the second end forming portion 130 (see FIG. 7). In this case, as described above, the squeeze bar may be formed using the remaining space by inserting the squeeze cylinder 320 only to a part of the squeeze cylinder insertion hole 132 of the second end forming unit 130.

7 illustrates that the squeeze cylinder 320 is inserted only to a part of the squeeze cylinder insertion hole 132 and the remaining area 130a is empty. The molten metal is injected into the remaining region 130a to form a squeeze bar described later.

After performing the insertion step, the molten metal is filled in the mold body 110 using the molten metal injection part 240 to perform an end ring forming step of forming the lower end ring C4 and the upper end ring C3 (FIG. 8). Reference). After performing the end ring forming step, the filled molten metal is injected into the remaining region 130a after the squeeze cylinder 320 of the second end forming portion 130 is inserted into the squeeze bar SB on the upper end ring C3. The squeeze bar forming step of forming a c) is performed (see FIG. 9).

As described above, only the partial region of the squeeze cylinder insertion hole 132 of the second end forming portion 130 is inserted into the squeeze cylinder 320 and the remaining region 130a is empty (see FIG. 8). ), The molten metal is filled to form a squeeze bar SB (see FIG. 9). Then, the molten metal injection unit 240 is separated, and the squeeze cylinder 320 is advanced to press the squeeze bar SB (see FIG. 9) to cast the rotor R (see FIG. 10). . In other words, by forming the squeeze bar more than the original rotor (R) volume and pressurizing the squeeze bar, it is possible to compensate for the cooling compression that generally occurs, thereby improving casting quality.

On the other hand, after 0.05 seconds to 3 seconds after the formation of the squeeze bar (SB) to advance the squeeze cylinder 320 to press the squeeze bar (SB) has been found to be preferable. The squeeze bar SB is formed in the upper end ring C3 (see FIG. 9) of the rotor R, and has a cylindrical shape having a height of 2 mm to 10 mm and a diameter of 1 mm to 15 mm from the upper end ring C3. It may be provided.

Then, after performing the step of pressurizing the squeeze bar, the ejection cylinder 330 is advanced to perform the ejection step of ejecting the rotor (R). At this time, when the ejection cylinder 330 advances, after passing through the passage 212 of the vent valve 210 described above, the rotor R is pushed out so that the rotor R is separated from the mold body 110. Allow extraction.

By the rotor casting method of the present invention as described above, it is possible to easily improve the casting quality by improving the filling rate of the molten metal.

Hereinafter, the case of casting by the present invention and the case of casting by the conventional casting method will be described.

12 is a cross-sectional photograph of an upper end mill cast by the prior art, and FIG. 13 is a cross-sectional photograph of an upper end mill cast by this invention. In the case of casting according to the prior art as shown in Figure 12 it can be seen that due to the air that was not discharged due to the air filling rate of the molten metal is not compact and the pore occurs in several places. However, in the case of casting according to the present invention as shown in FIG. 13, the filling rate of the molten metal is about 98% as the air inside the mold cavity is vented before the molten metal is injected.

What has been described above are only embodiments for implementing a rotor casting apparatus having a slide-controlled vent function according to the present invention, a rotor using the same, and a casting method thereof, and the present invention is not limited to the above embodiments, As claimed in the following claims, any person of ordinary skill in the art without departing from the gist of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

The present invention can improve the casting quality of the rotor by venting by controlling the air in the mold cavity by the slide method before injection of the molten metal for casting of the rotor, manufacturing an AC induction motor rotor used for home appliances and industrial use Very useful to

Claims

A mold assembly into which a rotor core is inserted to inject molten metal, a vent means for controlling and venting the air in the mold assembly by a slide method before the molten metal is injected into the mold assembly, and a melt filled in the mold assembly. A casting apparatus of a rotor including a pressing unit assembly for pressing,

The vent means includes a vacuum pump for discharging air in the mold assembly to the outside, a vent valve for selectively sealing the communication line between the inside of the mold assembly and the vacuum pump, and a tapered surface formed on one side of the vent valve. And a lifting member for moving the vent valve in a slide manner by moving the taper block downward in a tapered block contacting the surface.
The method according to claim 1,

The mold assembly may include a hollow mold body into which the core is inserted, a first end forming portion installed at one side of the mold body and used to form one side of the rotor, and the other side of the mold body. And a second end forming portion used to move according to the operation of the vent valve to form the other side of the rotor.
The method according to claim 2,

The pressing unit assembly includes a take-out cylinder for pushing out the rotor is completed casting, and a drive unit for driving the take-out cylinder,

And the second end forming portion includes a vent valve inserting hole into which a part of the vent valve is inserted.
The method according to claim 3,

The vent valve has an outer diameter fitted to the vent valve insertion hole, and extends out of the vent valve insertion hole and is in close contact with the other side of the core to form a predetermined space for forming an upper end ring of the rotor on a circumferential surface. And a tapered portion and a passage through which the ejection cylinder can be inserted.
The method according to claim 4,

The taper block includes a taper portion having a shape corresponding to the tapered surface so as to be in surface contact with the tapered surface, and a coupling portion coupled to an end portion of the elevating member. .
The method according to claim 5,

And the elevating member includes an actuator for driving the taper block in an up and down direction, and a housing for accommodating the actuator.
The method according to claim 3,

And the first end forming portion has a predetermined space for forming the lower end ring of the rotor in close contact with one side surface of the core.
The method according to claim 3,

And the second end forming portion has a predetermined space for forming the upper end ring of the rotor in a close contact with the other side surface of the core.
The method according to claim 3,

The first end forming portion includes a sealing member for sealing one end of the mold body, an injection hole through which the molten metal is injected into the mold body, and an air discharge hole. Rotor casting device with controlled vent function.
The method according to claim 5,

The pressing unit assembly further includes a plurality of squeeze cylinders driven by the driving unit to pressurize to improve the filling rate of the upper end ring,

And the second end forming portion further comprises a plurality of squeeze cylinder insertion holes into which the plurality of squeeze cylinders are inserted.
The method according to claim 10,

The vent valve further includes a flange having the tapered surface,

And a plurality of squeeze cylinder insertion holes into which the plurality of squeeze cylinders are inserted in the flange.
The method according to claim 10,

The tapered portion of the tapered block is a slide controlled type characterized in that the take-out cylinder through hole of the long hole form through which the take-out cylinder penetrates, and a plurality of squeeze cylinder through hole of the long hole form through which the plurality of squeeze cylinders are further formed. Rotor casting device having a vent function.
The rotor cast by the rotor casting apparatus which has a slide controlled vent function as described in any one of Claims 1-12.
A method of casting a rotor using a rotor casting device having a slide controlled vent function according to claim 3,

Venting the air inside the mold assembly through a communication line between the inside of the mold assembly and the vacuum pump formed by separating the second end forming portion from the other side of the mold body at predetermined intervals;

Sealing the other side of the mold body with the second end forming portion using the vent valve operated by the elevating member;

Injecting and pressing molten metal into the mold assembly to cast the rotor, and

And a step of extracting the rotor by advancing the ejection cylinder.