JPH0417554A - Cast rotor - Google Patents

Abstract

PURPOSE:To do the casting without a cavity by stacking a plurality of punched thin steel plates equipped with a plurality of slots, and holding them with upper and lower end rings, and providing some of the punched thin steel plates with slots for gas discharge, into which conductive molten metal is poured. CONSTITUTION:Punched thin steel plates, where a plurality of slots 8 are formed, are stacked to constitutes a rotor iron core 1. At that time, for some of the thin steel plates 1, reformed steel plates 9, which have slots 10 for gas discharge, are used, and those are interposed approximately at the center of the iron core 1. The rotor iron core 1 is held by an upper end ring 2b and a lower end ring 2a equipped with a vane 3, and a temporary shaft 7 is inserted in the center hole of the thin plates 1a, and those are set between upper and lower jigs 12 and 13 in a pair and are pressurized. Molten metal 6 is injected forcibly from a gate 5 into the slits 8 by a piston 11, and rotor bars 4 are cast. The needles gas arising at that time is discharged to outside from said slots 10.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a cast rotor formed by rotor punching having a gas venting structure.

[Conventional technology]

Fig. 4 is an overall view showing the casting rotor and jigs used when forming a conventional cast rotor, Fig. 5 is a plan view showing conventional rotor punching, and Fig. 6 is an inside view of the conventional rotor. 7 and 8 are cross-sectional views showing the conventional rotor core, and in the figure, 1 indicates the rotor punched 1a. 2a is the lower end ring,
2b is an upper end ring, 3 is a blade, 4 is a rotor bar, 5 is incorporated into a jig and a sprue through which the molten metal 6 rises, and 7 is a sprue for stacking and fixing the rotor punched plates 1a, and a center point between the jig and the tool. 8 is a slot in which the low cover 4 is formed, and 11 is a piston for pushing the molten metal 6 from the sprue 5 to the rotor core 1. Next, the operation will be explained. The rotor core 1 of the aluminum rotor is assembled using jigs and tools and a temporary shaft 7. A plurality of rotor punched plates 1a are sequentially stacked on the temporary shaft 7, and assembled into a preset jig and tool. Molten metal 6 is incorporated into the jig and tool. Sprue 5
The blades 3 and the lower end ring 2a are pushed upward, and the slot 8 and the upper end ring are filled with the molten metal 6, thereby producing the rotor core 1 of the aluminum rotor. Note that the number of sprues 5 and blades 3 is the same, and the number is less than the number of slots 8, and as shown in FIG. .

[Problem to be solved by the invention]

Since the conventional casting rotor is configured as described above, the number of sprues 5 and blades 3 does not match the number of slots 8,
Since the number of sprues 5 is smaller than the number of slots 8, as shown in FIG.
Since the entrance routes are different, the internal gas and entrained gas that occur when the molten metal 6 enters concentrates in the slot center part 8C, and the molten metal 6 solidifies without being able to completely release the internal gas, causing the internal gas to become defective. However, there were problems such as the formation of a nest in the slot central portion 8C. This invention was made to solve the above problems, and by improving the rotor punching that forms the rotor core, it completely releases the internal gas of the rotor core, thereby eliminating internal defects. The purpose of the present invention is to provide a cast-in rotor that can eliminate this problem.

[Means to solve the problem]

The cast rotor according to the present invention releases gas to the outside when molten metal (conductive material in a molten state) is injected into some rotor blanks of a plurality of laminated rotor blanks. A slit is provided for this purpose.

[Effect]

The cast rotor of this invention is improved from conventional rotor punching to form the rotor core from rotor punching with slits, so that the gas in the center of the slots is completely released, and the gas is transferred to the cast rotor. Prevent the formation of nests caused by

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
FIG. 2 is an overall view showing a casting rotor and jigs and tools for forming a casting rotor according to an embodiment of the present invention; FIG. 2 is a plan view showing rotor punching according to an embodiment of the present invention; FIG. 3 is a cross-sectional view showing the entrance path when molten metal (molten conductive material) is injected into the rotor of an embodiment of the present invention, and 1 to 8 and 11 are completely the same as the above conventional rotor. It is something. 9 is a rotor punched plate that is slightly thicker than the rotor punched plate 1a, and is improved by providing a narrow slit 10 on the outer periphery of the slot 8 so that only gas can be discharged without releasing the molten metal 6. be. Next, the operation will be explained. The rotor core 1 of the aluminum rotor is assembled using jigs and temporary shafts 7 as in the past.
When stacking a plurality of pieces of A on the temporary shaft 7, the improved rotor punched plate 9 is installed so that it will be in the center of the stack when the final stack is stacked, and the molten metal 6 is placed in the jig and tool as in the conventional case. The blades 3 and the lower end ring 2a are pushed upward through the sprue 5 built in, and the slot 8 and the upper end ring are filled with the molten metal 6 to produce the rotor core 1 of the aluminum rotor. As shown in Fig. 3, the molten metal 6 follows the entry path indicated by the arrow, and the gas inside the rotor gathers in the slot central portion 8c, forming the slit 10 of the improved rotor blank 9.
Only more gas is released. In the above embodiments, the rotor of a vertical motor is used as an application example, but the present invention applies to the rotor of a horizontal motor.
It can be applied to low-pressure casting, centrifugal casting, etc., casting of various aluminum rotors, and not only aluminum materials but also aluminum alloys and other alloys such as copper alloys. Further, the present invention can be applied to the structure of the rotor core 1 regardless of the presence or absence of the blades 3 and the shape of the slots 8. Effect of the invention 1 As described above, according to the present invention, since the improved rotor punching is installed, the internal gas in the center of the slot of the rotor core is completely discharged, and the This has the effect of obtaining a cast-in rotor with stable quality.

[Brief explanation of drawings]

FIG. 1 is an overall view showing a casting rotor and jigs and tools when forming a casting rotor according to an embodiment of the present invention, and FIG. 2 is a plan view showing rotor punching according to an embodiment of the present invention.
FIG. 3 shows molten metal (
A sectional view showing the approach path when injecting a molten conductive material), Fig. 4 is an overall view showing the casting rotor and jigs when forming a conventional casting rotor, and Fig. 5 shows a conventional rotor. FIG. 6 is a plan view showing the child punching board, FIG. 6 is a cross-sectional view showing the entry route for injecting molten metal (molten conductive material) into the interior of a conventional rotor, and FIGS. 7 and 8 are views of a conventional rotor. It is a sectional view showing an iron core. In the figure, 1 is the rotor core, 1a is the rotor punched, and 2a is the rotor core.
is the lower end ring, 2b is the upper end ring, 3 is the vane, 4 is the rotor bar, 5 is the sprue, 6 is the molten metal (molten conductive material), 7 is the temporary shaft, 8 is the slot, 9 is the improved rotor 10 is a slit 7 of the rotor punched plate 9, and 11 is a piston for pressing the molten metal. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. 870, To7'Ka, To

Claims (1)

[Claims] A rotor core formed by stacking a plurality of rotor blanks each having a plurality of slots, an upper end ring attached to the upper end of the rotor core, and a lower end ring attached to the lower end of the rotor core. a cast rotor comprising a ring, a vane attached to the lower end of the lower end ring, and a rotor bar formed by injecting a molten conductive material into the slots of the laminated rotor blanks. The rotor blanking plate is characterized in that some of the laminated rotor blanking plates are provided with slits for releasing gas generated when injecting the conductive material to the outside. Cast-in rotor.