KR101071280B1 - Motor rotor casting apparatus and process with squeeze bar pressuring method - Google Patents

Abstract

The present invention relates to a rotor casting apparatus and method, and in particular, after forming a certain area protruding squeeze bar during rotor casting, pressurizing the squeeze bar to the rotor side to improve the filling rate of the end ring during casting of the rotor to the end The present invention relates to a rotor casting apparatus of a squeeze bar pressurizing method capable of improving the casting quality by reducing the porosity of a ring and improving the density thereof, and a rotor using the same and a casting method thereof.

High density, aluminum, rotor, squeeze bar

Description

Rotor casting apparatus of squeeze bar pressurization method and rotor using same and motor casting method {Motor rotor casting apparatus and process with squeeze bar pressuring method}

The present invention relates to a rotor casting apparatus and method, and in particular, after forming a certain area protruding squeeze bar during rotor casting, pressurizing the squeeze bar to the rotor side to improve the filling rate of the end ring during casting of the rotor to the end The present invention relates to a rotor casting apparatus of a squeeze bar pressurizing method capable of improving the casting quality by reducing the porosity of a ring and improving the density thereof, and a rotor using the same and a casting method thereof.

In general, a compressor is installed in a refrigeration cycle to drive a piston installed in a compression chamber by the operation of a rotor, and refrigerant gas is compressed by the driven piston to perform a cooling operation.

Such a rotor is described with reference to FIGS. 1A and 1B.

1A is a conceptual diagram illustrating a core of a rotor, and FIG. 1B is a conceptual diagram illustrating upper and lower end rings formed by casting a molten aluminum on the core.

As illustrated, the core C is formed by stacking a plurality of iron cores C1 having a plurality of slots C2.

The upper end ring C3 and the lower end ring C4 are formed on upper and lower portions of the iron core C1.

The core C is placed in a predetermined mold (not shown), and then molten metal is injected to harden the molten metal through the slot C2 to form the rotor R as described above.

Conventionally, the technique for casting the rotor (R) is divided into 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.

Although the rotor manufacturing method of the motor for a compressor using the centrifugal casting method shows high filling rate and excellent efficiency, there is a problem that cannot be universally applied.

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 the rotor is injected into the ingate to which the molten metal is biased on one side, so that the bubbles are distributed in the part without the ingate in the rotor, so that the rotor There is a problem that the imbalance of the vibration noise is generated and the efficiency is lowered.

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.

The horizontal high pressure casting method using the horizontal injection method uses a low cost equipment and consumes a small amount of aluminum, so that the rotor can be manufactured at a low production cost. However, the horizontal high pressure casting method has a lower filling rate than other manufacturing methods.

An object of the present invention is to provide a casting apparatus and method which can easily improve the casting quality by increasing the filling rate by pressing the squeeze bar after protruding the squeeze bar in one region during molten metal injection. There is this.

The present invention for achieving the above object is a casting apparatus of a rotor including a mold assembly to which the core of the rotor is inserted to inject molten metal and a pressurizing unit assembly for pressurizing the melt filled in the mold assembly. A hollow cylindrical mold body into which the core is inserted, a molten metal injection portion formed at one end of the main body and injected with the molten metal, and formed at the other end of the main body, and a squeeze cylinder of the pressurizing assembly And a plurality of cylinder inserting portions into which cylinders are inserted, and the pressurizing portion assembly includes a squeeze cylinder inserted into the cylinder inserting portion, a ejection cylinder for pushing out the cast rotor, and driving the ejection cylinder and the squeeze cylinder. Including a drive unit, the squeeze cylinder of the cylinder insert is inserted A squeeze bar pressurized rotor casting apparatus for casting the rotor by pressing the squeeze cylinder is injected into the remaining area formed by the squeeze cylinder.

At this time, the cylinder inserting portion is a cylindrical insert portion body for sealing the other end of the mold body, and the squeeze cylinder insertion hole and the ejection cylinder insertion hole is formed so as to pass through the disk, respectively, the squeeze cylinder and the ejection cylinder is inserted; It may include.

In addition, the molten metal injection portion may include a disk-shaped disk that seals one end of the mold body and an injection hole through which the molten metal is injected into the mold body.

In addition, the injection holes may be formed in four to twelve, but the gate for injecting molten metal into the injection hole may also include four to twelve fins.

The driving unit may include an actuator for driving the ejection cylinder and the squeeze cylinder, and a housing for accommodating the actuator.

In addition, the squeeze bar may be formed in the upper end ring of the rotor and may have a cylindrical shape having a height of 2mm to 10mm and a diameter of 1mm to 15mm from the upper end ring.

Meanwhile, the present invention includes inserting the squeeze cylinder to only one region of the cylinder inserting portion, filling the mold body with a molten metal to form a how-end ring and an upper end ring, and the filled molten metal is inserted into the cylinder inserting portion. Forming a squeeze bar on the upper end ring by inserting a heavy squeeze cylinder into the remaining region; advancing the squeeze cylinder to pressurize the squeeze bar to cast the rotor; There is another feature of the rotor casting method using a casting apparatus of the squeeze bar press method including the step of taking out the rotor.

In this case, the squeeze bar may be pressurized by advancing the squeeze cylinder after 0.05 seconds to 3 seconds after the squeeze bar is formed.

The present invention as described above can pressurize the squeeze bar to improve the filling rate, thereby reducing the porosity of the end ring and improving the density, thereby improving casting quality.

Hereinafter, with reference to the accompanying drawings and embodiments will be described in detail with respect to the present invention.

2 is a partial cross-sectional perspective view showing the casting apparatus 10 of the present invention separately.

3 to 7 are conceptual diagrams showing the procedure of casting the rotor by the casting apparatus 10 of the present invention.

8 and 9 are cross-sectional views of the upper end ring of the rotor cast by the conventional casting method and the casting method of the present invention, respectively.

10 and 11 are enlarged views of the upper end ring of the rotor cast by the conventional casting method and the casting method of the present invention, respectively.

Example 1

In the rotor casting device 10 of the present invention, the core assembly C of the rotor R is inserted to press the mold assembly 100 into which the molten metal is injected, and the pressurizing unit assembly to press the molten metal filled in the mold assembly 100. 200. (See FIG. 2)

The mold assembly 100 includes a hollow cylindrical mold body 110 into which the core C is inserted, and a molten metal injection part 120 formed at one end of the body 110 to inject the molten metal. It is formed on the other end of the main body 110 includes a cylinder insertion portion 130 is inserted into the squeeze cylinder 220 and the extraction cylinder 230 of the pressing unit assembly 200.

The pressurizing unit assembly 200 includes a squeeze cylinder 220 inserted into the cylinder insertion unit 130, a blowout cylinder 230 for pushing out the cast rotor R (see FIG. 1B), and the blowout And a driver 210 for driving the cylinder 230 and the squeeze cylinder 220.

By such a configuration, after protruding the squeeze bar in one region (the upper end ring in this embodiment) of the rotor R, the squeeze bar 220 is pressed by the squeeze bar to improve the filling efficiency of the molten metal.

To this end, the squeeze cylinder 220 is inserted into only one region instead of penetrating the cylinder insertion unit 130, and molten metal filled in the remaining region is injected to form a squeeze bar.

Thereafter, the squeeze cylinder 220 is pressed by the squeeze bar.

This will be described later.

Meanwhile, the cylinder inserting unit 130 is formed to penetrate the center portion of the cylindrical inserting unit main body 131 and the inserting unit main body 131 to seal the other end portion of the mold main body 110 (take-out cylinder ( A blowout cylinder insertion hole 133 for inserting the 230 and the main body 131 may be formed around the center of the insertion part main body 131 to allow the squeeze cylinder 220 to be inserted thereinto. Squeeze cylinder insertion hole 132 is included.

On the other hand, extending from the end of the ejection cylinder insertion hole 133 toward the core C side to fix the core C, while the ejection cylinder insertion hole 133 communicates with the core C. It is also possible to further include a fixing ring 134 which can be inserted into the ejection cylinder 230 when the ejection of the push (C) to push.

In this embodiment, the mold main body 110 is provided with a hollow cylindrical shape, but the left and right ends have an open pipe shape.

In addition, it is illustrated that the cylinder inserting portion 130 has an inserting portion main body 131 covering the left opening in the drawing of the mold main body 110.

In this case, the squeeze cylinder insertion hole 132 and the ejection cylinder insertion hole 133 pass through the insertion part main body 131.

However, the cylinder insertion unit 130 is intended to block the one side of the mold body 110 while the squeeze cylinder 220 and the ejection cylinder 230 as described above is inserted to achieve this purpose. It is to be understood that even if the cylinder inserting portion 130 is integrally formed in the mold body 110 or has a different shape, all of the cylinder insertion portions 130 fall within the scope of the present invention.

Meanwhile, in the present embodiment, the squeeze cylinder insertion hole 132 is formed after protruding toward the mold main body 110 from the insertion part main body 131 to form a step 131a inserted into the mold main body 110. And the ejection cylinder insertion hole 133 is formed to penetrate the step 131a.

In this case, as described above, the squeeze cylinder 220 is not inserted into the entire area of the squeeze cylinder insertion hole 132 (that is, to the mold main body 110 side end portion of the insertion hole 132), but is partially. Only the region (eg midpoint) is inserted so that the rest of the region is empty.

The molten metal is injected into the remaining empty area to form a squeeze bar, and the squeeze cylinder 220 presses the formed squeeze bar.

The stepped portion 131a is only one example of a shape in which the squeeze bar insertion hole 132 and the ejection cylinder insertion hole 133 may be formed, and it should be understood that the present invention is not limited by the present embodiment.

In addition, the fixing ring 134 is formed extending from the ejection cylinder insertion hole 133 to the right direction, that is, the core (C) side in the drawing to press the core (C) as described above.

However, the fixing ring 134 presses and fixes the core C as described above, while the ejection cylinder 230 is inserted to push out the core C to take out the bar. As long as the fixing ring 134 has a different shape as long as it is achieved, it is a matter of course for the present invention to fall within the scope of the present invention.

At this time, as described above, the ejection cylinder 230 is installed to penetrate the ejection cylinder insertion hole 133 to press the shaped rotor R, which will be described later.

Meanwhile, the molten metal injection unit 120 penetrates the disk-shaped disc 121 sealing the one end of the mold body 110 and the disk 121 so that the molten metal is injected into the mold body 110. It may include an injection hole 122.

In the present embodiment, it is illustrated that the disk 121 of the molten metal injection part 120 covers the right opening part in the drawing of the mold main body 110.

In addition, the injection hole 122 is exemplified by three penetrating through the disk 121.

However, as described above, the molten metal injecting part 120 is intended to allow the molten metal to be injected into the mold main body 110, so that the disk 121 of the molten metal injecting part 120 is achieved. As illustrated, even if formed separately from the mold main body 110 or integrally formed in the mold main body 110, all belong to the scope of the present invention.

On the other hand, the injection hole 122 is formed of 4 to 12, but the gate (G) for injecting molten metal into the injection hole 122 may also include 4 to 12 pins (P) will be described later do.

The driving unit 210 of the pressing unit assembly 200 may include an actuator (not shown) for driving the ejection cylinder 230 and the squeeze cylinder 220, and a housing 211 for accommodating the actuator. .

In this case, the actuator is a generic term for allowing the ejection cylinder 230 and the squeeze cylinder 220 to be moved back and forth.

For example, a commonly used hydraulic or pneumatic cylinder actuator can be used.

Alternatively, a mechanical actuator, such as a gear, may be used to gear forward and backward the cylinders 220 and 230 by gear coupling with each of the cylinders 220 and 230.

Or 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 move the cylinders 220 and 230 back and forth.

In this embodiment, it is illustrated that the actuator is embedded in a thick disk-shaped housing 211.

However, this is merely an example for explaining the present invention, and for example, even if the actuator is installed outside the housing 211 rather than the built-in manner in the housing 211, all belong to the scope of the present invention Of course.

The rotor R can be cast and produced by the casting apparatus 10 of the present invention as described above.

Hereinafter, a method of casting the rotor R by using the casting apparatus 10 of the present invention will be described with reference to Embodiment 2 and FIGS. 3 to 8.

Example 2

The rotor casting method S100 of the present invention is a method of casting the rotor using the rotor casting device 10 of the squeeze bar pressurization method of the present invention described above.

At this time, the present invention includes the step of inserting the squeeze cylinder 220 only to one region of the cylinder insertion unit 130 (S110).

In this case, as described above, the squeeze bar may be formed using the remaining space by inserting the squeeze cylinder 220 only to one region of the squeeze cylinder insertion hole 132 of the cylinder insertion unit 130.

Meanwhile, before performing step S110, the first preliminary step S111 of inserting the core C into the mold body 110 may be performed.

In addition, the method may further include manufacturing the molten metal before performing the step S110 of inserting the squeeze cylinder 220 only to one region of the cylinder insertion unit 130 (S112).

At this time, the molten metal using 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 of 700 ℃ to 750 ℃.

3 shows that the core C is installed inside the mold main body 110 by performing a dashed process on the mold main body 110 in order to express the drawings more clearly.

In FIG. 3, the squeeze cylinder 220 is inserted into only one region of the squeeze cylinder insertion hole 132 and the remaining region 130a is vacant.

The molten metal is injected into the remaining region 130a to form a squeeze bar to be described later.

After performing the step (S110) and filling the molten metal in the mold body 110 to perform a step (S120) to form a how-end ring (C4) and the upper end ring (C3) (see Fig. 4, 5). )

After performing the step S120, the filled molten metal is injected into the remaining region 130a after the squeeze cylinder of the cylinder insertion unit 130 is inserted to form a squeeze bar on the upper end ring C3 ( S130) (see FIGS. 4 and 5).

In FIG. 4, the molten metal is introduced through the gate G and then injected into the mold body 110 via the pin P installed in the gate G. Referring to FIG.

At this time, as described above, after forming four to twelve injection holes 121 of the molten metal injection part 120, it is also possible to form four to twelve pins P provided on the gate G. (See Fig. 2)

In this case, the molten metal may be filled into the mold main body 110 with a plunger (not shown) after injecting the molten metal.

Since such a casting method, that is, a gate (G) or a plunger is a well-known casting technique, illustration and description of detailed drawings are omitted.

As described above, only one region of the squeeze cylinder insertion hole 132 of the cylinder insertion unit 130 is inserted into the squeeze cylinder 220 and the remaining region 130a is empty (see FIG. 4). ), The molten metal is filled, and eventually a squeeze bar SB is formed (see FIG. 5).

At this time, the step of advancing the squeeze cylinder 220 to press the squeeze bar (SB, see Fig. 5) to cast the rotor (S140) (see Fig. 6).

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 the squeeze bar (SB) formed 0.05 seconds to 3 seconds to advance the squeeze cylinder 220 to pressurize the squeeze bar (SB) has been found to be preferable.

Meanwhile, the squeeze bar SB is formed on the upper end ring C3 of the rotor R (see FIG. 5), and has 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 have a cylindrical shape.

On the other hand, after performing the step of pressing the squeeze bar (S140), the ejection cylinder 230 is advanced to take out the rotor (R) (S150).

At this time, when the ejection cylinder 230 moves forward, after passing through the fixing ring 134 described above, the rotor R is pushed out so that the rotor R is separated from the mold body 110. Do it.

By the rotor casting method (S100) of the present invention as described above can improve the filling rate of the molten metal can be easily improved casting quality.

Hereinafter, the present invention will be compared with the case of casting by the case of casting by the conventional casting method.

Figure 9 is a cross-sectional photograph of the upper end mill cast by the present invention and Figure 8 is a cross-sectional photograph of the upper end mill cast by the prior art.

In FIG. 8, as the case cast by the prior art, the filling of the molten metal is insufficient, and thus, when the cooling is performed, the pore is generated at a high density and the pore is generated.

In contrast, FIG. 9 shows that the tissue is dense by additional filling of the squeeze bar as described above.

10 and 11 illustrate the enlarged view.

10 is an enlarged cross-sectional view of an upper end ring cast by the prior art, and FIG. 11 is an enlarged cross-sectional view of an upper end ring cast by the present invention.

As shown in FIG. 10, a plurality of air porosity can be confirmed. This indicates that the tissue formed by casting is not dense and has many defects.

In contrast, in the case of FIG. 11 according to the present invention, the pores are not found, whereby the tissue is compact when cast by the present invention.

1A is a conceptual diagram showing a core of a rotor;

1B is a conceptual diagram showing the upper and lower end rings formed by casting a molten aluminum on the core;

2 is a partial cross-sectional perspective view showing the casting apparatus of the present invention separately;

3 to 7 is a conceptual diagram showing the procedure of casting the rotor by the casting device of the present invention,

8 and 9 are cross-sectional views of the upper end ring of the rotor cast by the conventional casting method and the casting method of the present invention, respectively,

10 and 11 are enlarged views of the upper end ring of the rotor cast by the conventional casting method and the casting method of the present invention, respectively.

<Explanation of symbols for the main parts of the drawings>

100: mold assembly 110: mold body

120: molten metal injection unit 130: cylinder insertion unit

200: pressurizing unit assembly 210: driving unit

220: squeeze cylinder 230: ejection cylinder

R: Rotor SB: Squeeze Bar

Claims (12)

A casting apparatus of a rotor including a mold assembly into which a core of a rotor is inserted to inject molten metal and a pressurizing unit assembly to press the melt filled in the mold assembly. The mold assembly may include a hollow cylindrical mold body into which the core is inserted, a molten metal injection portion formed at one end of the main body and into which the molten metal is injected, and formed at the other end of the mold body. A cylinder insert portion into which the squeeze cylinder and the ejection cylinder of the The pressurizing unit assembly includes a squeeze cylinder inserted into the cylinder inserting unit, a ejection cylinder for pushing out the cast rotor, and a driving unit for driving the ejection cylinder and the squeeze cylinder. The squeeze bar press type rotor casting apparatus, characterized in that for casting the rotor by pressing the squeeze cylinder is formed by the injection of the squeeze cylinder is inserted into the remaining area of the cylinder insertion portion. The method of claim 1, The cylinder insert portion is a cylindrical insert portion body for sealing the other end of the mold body, A ejection cylinder insertion hole which is formed to penetrate the center portion of the insertion unit main body so that the ejection cylinder can be inserted therein; Squeeze bar press type rotor casting apparatus, characterized in that it comprises a squeeze cylinder insertion hole formed so as to penetrate the main body around the center portion of the insertion unit main body so that the squeeze cylinder can be inserted. The method of claim 1, The molten metal injection part includes a disk-shaped disk for sealing one end of the mold body and a rotor hole for squeeze bar pressurization, characterized in that the injection hole allows the molten metal to be injected into the mold body side. Device. The method of claim 3, The injection hole is formed of four to twelve, squeeze bar pressurized rotor casting apparatus, characterized in that the gate for injecting molten metal into the injection hole also comprises four to twelve pins. The method of claim 1, The drive unit is a squeeze bar pressurized rotor casting apparatus characterized in that it comprises an actuator for driving the ejection cylinder and the squeeze cylinder and a housing for accommodating the actuator. The method of claim 1, The squeeze bar is formed on the upper end ring of the rotor, the squeeze bar press type rotor casting apparatus, characterized in that the cylindrical shape having a height of 2mm to 10mm and a diameter of 1mm to 15mm from the upper end ring. The method of claim 2, The core extends from the end of the ejection cylinder insertion hole toward the core side to fix the core while the ejection cylinder insertion hole communicates with the ejection cylinder to be inserted therein to push the core out. Squeeze bar pressurized rotor casting device characterized in that it further comprises a fixing ring. The rotor cast using the rotor casting apparatus of the squeeze bar press method according to any one of claims 1 to 7. A method of casting a rotor using the rotor casting apparatus of the squeeze bar pressurization method according to claim 1, Inserting the squeeze cylinder into only one region of the cylinder inserting portion; Filling the mold body with molten metal to form a how-end ring and an upper end ring; Filling the molten metal into an area remaining after the squeeze cylinder is inserted in the cylinder insert to form a squeeze bar on the upper end ring; Advancing the squeeze cylinder to pressurize the squeeze bar to cast the rotor; Rotor casting method using the casting device of the squeeze bar press method comprising the step of extracting the rotor by moving the ejection cylinder forward; 10. The method of claim 9, 0.05 to 3 seconds after the formation of the squeeze bar, the rotor casting method using the squeeze bar press type casting apparatus, characterized in that for pressing the squeeze bar by advancing the squeeze cylinder 10. The method of claim 9, The method may further include manufacturing the molten metal before performing the step of inserting the squeeze cylinder into only one region of the cylinder inserting portion. The molten metal uses a purity of 99.5% or more, and the molten aluminum melt temperature is 700 ° C to 750 ° C rotor casting method using a squeeze bar press type casting apparatus, characterized in that. 10. The method of claim 9, And inserting a core into the mold body before performing the step of inserting the squeeze cylinder into only one region of the cylinder inserting portion.

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