JPS5970453A - Production of rotor cast in aluminum - Google Patents

Abstract

PURPOSE:To produce titled rotor in which no blow hole by gas is produced by disposing a vent plate of an externally tapered ring shape into the inside circumferential recess of a holder on the side opposite to a sprue in the upper part of a mold on the side opposite to the sprue thereby forming a vent passage and well. CONSTITUTION:A vent plate 27 of an externally tapered 26 ring shape is disposed in the inside circumferential recess of a holder 14a on a mold on the side opposite to a sprue, and is bolted 28 to the holder 14a. The holder 14a attached with such a plate 27 is placed on a mold 13a on the side opposite to the sprue, and a guide pin 21 is inserted into a stepped hole 24 and an oversized hole 22. A vent passage 32 having a clearance delta is formed between the mold 13a and the plate 27 in contact therewith and a well 29 for vent gas is formed in the tapered 26 part. The gas generated in the stage of casting Al is released through the hole 17 of the mold 13a and partly the passage 32 to the outside and is mostly accumulated in the well 29, from which the gas is released to the outside when the mold is lifted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing an aluminum casting rotor in which gas is released when a rotor conductor of a rotating electrical machine is formed by aluminum casting.

[Technical background of the invention]

The rotor conductor of a rotating electrical machine will be explained starting from a vertical or horizontal type. Figure 1 is a cross-sectional view of the main parts of a device for casting an aluminum cast rotor using a vertical die-casting machine, in which rotor blanks 4 having a plurality of m3 are laminated in advance on a core metal 2 having a flange 1. do. Next, a circular gate plate 7 having a plurality of sprues 6 is disposed at the bottom of a circular mold plate 5 having a step on the outer periphery, and a circular gate plate 7 having a recess 8 in the center is placed in the upper part of the mold plate 5. The sprue side M19 of the shape is arranged.

A hole 10 for forming an end ring and a plurality of blades on the sprue side is bored in the sprue side mold 9 by aluminum casting, and also serves as a runner. The flange l of the core metal 2 on which the rotor punched plates 4 are laminated is fitted into the recess 8 in the center of the sprue side mold 9. Next, the outer periphery of the laminated core 11 is divided into three rings 1
2, and the mold 1 on the opposite side of the sprue is placed on the upper end surface of the three-split ring 12.
3 is disposed, and a mold holder 14 on the opposite sprue side and a mold holder mounting plate 15 on the opposite sprue side are placed on top of the mold holder 14 to form a pouring rate fixture 16. The anti-molten metal drain passage 32 is provided, and a hole 17 for forming an end ring and a plurality of vanes is bored in the anti-molten metal mold 13. Further, a mold release agent is applied to the molten aluminum contact surfaces of the sprue side mold 9 and the opposite sprue side mold 13.

Then, a predetermined amount of molten aluminum is injected from a crucible (not shown) onto a plunger 19 disposed inside the sleeve 18 of the die-casting machine.

Then, the pouring rate equipment 16 assembled in a separate process is placed on the sleeve 8 of the die-casting machine, and pressure is applied from above the mold holder mounting plate 15 on the side opposite to the sprue in the direction of the arrow with a press (not shown). In this state, the plunger 19 is pushed up at high pressure and high speed and casting is performed all at once to form an end ring on the gate side, a plurality of blades, and a rotor conductor, and an end ring and a plurality of blades on the gate side. Then, the pressing force of the press is removed, the mold is disassembled, and the aluminum cast rotor core is taken out.

[Problems with background technology]

However, in such a casting method, gas is generated when the gate plate into which aluminum is cast, the sprue side mold, and the air or mold release agent in the cavity in the laminated core come into contact with molten aluminum and burn. These gases are not all released to the outside because the gas vent passage 32 is narrow and long. Therefore, the generated gas accumulates inside the aluminum cast part of the rotor core, causing holes in the rotor conductors and end rings.

One possible solution to this problem is to use a high-pressure Kadai casting machine. However, even if a high-pressure die-casting machine is used, the ratio of the pressure distribution of the die-casting machine to the outer diameter of the rotor core to be cast, that is, the pressure per unit area in the casting cavity, is As the outer diameter of the rotor core increases, the diameter of the rotor core decreases relatively, making it difficult to make the hole smaller.

[Purpose of the invention]

The present invention improves the above-mentioned drawbacks, and provides a method for manufacturing an aluminum casting rotor that reliably eliminates the formation of cavities due to gas by disposing a gas venting plate on the mold holder on the opposite side of the sprue. O [Summary of the Invention] The present invention surrounds rotor punched plates laminated on a core metal with a three-split ring, a molten metal molding on the opposite side of the molten metal 41, and a holder on the opposite side of the molten metal sprue, In the commonly understood aluminum casting rotor manufacturing method in which rotor conductors are formed by pressurizing aluminum, there is a ring-shaped outer periphery tapered gas venting ring attached to the upper part of the anti-sprue side mold holder at the four inner circumferences of the anti-sprue side mold holder. Place the plate provided with the plate, form a gas vent passage at the joint between the anti-sprue type tII and the gas vent plate, and connect the anti-sprue side mold, the anti-spruce side mold holder, and the This is a method of manufacturing an aluminum cast rotor in which a degassing reservoir is formed in a portion surrounded by a taper. As a result, the gas generated during casting is collected in the gas venting section and released when the mold holder on the side opposite to the sprue rises. Therefore, the occurrence of burrows due to gas can be reliably eliminated.
Forms rotor conductors and end rings with good aluminum crystal structure.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a longitudinal cross-sectional view of a main part of an apparatus for a method of casting an aluminum casting rotor according to an embodiment of the present invention, and the same parts as those in FIG. In the figure, a rotor blank 4 having a plurality of grooves 3 is laminated to a specified thickness on a core metal 2 having a flange l in advance. Next, a circular gate plate 7 having a plurality of sprues 6 is placed at the bottom of the circular mold 5 having a step on its outer periphery. A circular sprue side mold 9 having a recess 8 in the center is disposed above the mold 5. This sprue side mold 9 has a hole 10 formed by aluminum casting to form a sprue side end ring and a plurality of vanes, and also serves as a runner.

The flange 1 of the core metal 2 on which the rotor blanks 4 are laminated is fitted into the recess 8 in the center of the sprue 11 mold 9. Subsequently, the outer periphery of the laminated iron core 11 is surrounded by a three-split ring 12, and the anti-gate side mold 13a is placed on the upper end surface of the three-split ring 12. This anti-i! The mouth side mold 13 a tri has a ring shape and has a hollow hole n into which the guide bin 21 is inserted near the outer periphery and a support rod through hole n are diagonally bored. Also, by casting aluminum, holes 17 are bored to form an end ring and a plurality of vanes on the opposite side of the sprue.

There is a ring-shaped gas 5 near the outer periphery on the upper part of the mold 13a on the opposite side of the sprue.
A mold holder 14a on the side opposite to the sprue and having a hole therein is mounted thereon.

On the opposite side of the sprue, a degassing plate γ having a ring shape and a tapered outer circumference is disposed on the four parts of the inner circumference of the mold holder 14a, and is fixed to the mold holder 14a on the opposite side of the sprue with a bolt l-28. Otsu. The mold holder 14a is placed on the opposite mold 13a, and the guide bin 21 is inserted into the stepped hole and the hole.

At this time, a clearance δ is set between 0.05 and 0.05 between the side die 13a and the abutting plate 27 for degassing.
15 shoulders are provided, and surrounded by the opposite mold 13a, the opposite mold holder 14a, and the tapered crystal, a degassing reservoir is formed in the resistant part.

The distance A between the inner diameter side of the taper forming the degassing reservoir 29 and the tip of the hole 17 of the die 13a on the side opposite to the sprue is set at 0.00000.
05 to 0. Clearance δ for l0m5+set is 0.05
or 0.151Il. Next, a circular mold holder mounting plate 15a having a circular shape with screw holes near the outer periphery and stepped holes on the diagonal is attached to the mold holder mounting plate 15a on the opposite sprue side.
a and fix it with bolts 31. Then, the support rod 32, which is longer than the combined thickness of the anti-sprue side mold 13a and the anti-sprue side mold holder 14a, is inserted into the support-rod through hole n, 25, fixed in the screw hole I, and cast. Including equipment 16a. Furthermore, sprue side mold 13a and sprue side mold 9
A mold release agent is applied to the surface that contacts the molten aluminum. Subsequently, a predetermined amount of molten aluminum is injected from a crucible (not shown) onto the plunger 19 disposed inside the sleeve 18 of the die-casting machine. The above-mentioned casting rate 1 product 16a assembled in a separate process is placed on the sleeve 18 of the die-casting machine, and pressure is applied in the direction of the arrow with a press (not shown) from above the mold holder mounting plate 15a on the side opposite to the sprue. In this state, the plunger 19 is pushed up at high pressure and high speed to perform casting all at once to form the end ring on the sprue side, a plurality of blades, and the rotor conductor, and the end ring on the gate side, a plurality of blades, and roots. Next, as shown in FIG. 3, raise the anti-groove side mold holder □a and open the anti-gutter 111Ia! !
A space is provided between the holder 14a and the opposite sprue side mold 13a, and the aluminum scum and impurities adhering to the gas venting tray 27 and the opposite sprue side mold 13a are removed using compressed air. blow off. Subsequently, the splitting jig 12 and the sprue side mold 9 are disassembled to remove the cast aluminum rotor core.

Therefore, some of the gas generated during aluminum casting is discharged from the tip of the hole 17 on the opposite sprue side "fJ 13a" to the outside through the gas venting passage 3I from the inner diameter side.

However, since the gas vent passage 32 is narrow and long, the flow resistance is large, and most of the gas is concentrated in the gas vent 1 and 4 where the flow resistance is small. When the hole f14a of the mold on the side opposite to the sprue shown in FIG. As a result, the occurrence of cavities caused by gas can be reliably eliminated, and a good rotor conductor and end ring can be formed due to the aluminum crystal structure.

In addition, the aluminum scum and impurities formed on the mold 13a on the opposite side of the sprue and the degassing plate n after casting can be removed with compressed air after each casting, so that the gas is reliably removed from the outside. You can request to release it to.

〔Effect of the invention〕 .

According to the above inventor's invention, a degassing reservoir is provided at the overlap between the mold on the opposite sprue side and the degassing plate, and the gas generated during casting is collected in the degassing reservoir when the mold holder on the opposite sprue side is raised. Made it release gas. It is possible to provide an aluminum casting rotor manufacturing method that reliably eliminates the formation of cavities due to this knot gas and forms a rotor conductor and endrin with a good aluminum crystal structure.

“°:7:2;:nini4-t-?x)y&y.15.
700 and 2' are longitudinal cross-sectional views of essential parts of a die-cast thin film according to the present invention, and Figures 3-3 and 4 are longitudinal cross-sectional views of essential parts of a casting method according to the present invention.

2...Core metal, 4...Rotor punching, 11.
...Laminated iron core 13.13a...Anti-gate side type,
14, 14a... Opposite sprue side type holder, 1.5, 15
a... Opposite sprue side type holder mounting plate, 10, 17...
・Hole, Machining... Taper, n... Gas venting plate, 28... Cavity, δ... Clearance,
A...distance l.

(7317) Representative Patent Attorney Kensuke Norichika (and 1 other person) ←υ Figure 1 Figure 2 15α30 ÷ 28/4 kyu 29 227322.5 24/ 228 13, L23 ”　　　　　　　3/ 32 2 ／6 years ・　3/2 Figure 3 Figure 4

Claims (1)

[Claims] A ring divided into three parts around the rotor punched plate laminated on the core metal,! In an aluminum casting rotor manufacturing method in which the rotor is surrounded by a rotor side mold and a holder on the opposite sprue side, and molten aluminum is press-fitted to form a rotor conductor, the rotor is placed in the upper part of the mold on the opposite sprue side. A herring-shaped degassing plate with a tapered outer periphery is placed in the recess on the inner circumference of the side mold holder, and a degassing passage is formed at the joint between the mold on the side opposite to the sprue and the degassing plate. . A method for manufacturing an aluminum casting rotor, characterized in that a degassing reservoir is formed in a portion surrounded by the opposite mold, the opposite mold holder, and the taper.