JPS6264464A - Casting device for cage type rotor - Google Patents

Abstract

PURPOSE:To stably produce a cage type rotor having no blowholes in the stage of casting the cage type rotor by providing plural pieces of cavities which permits the insertion of the slots of the rotor iron cores into the gravity direction to a metallic mold and radially connecting the same from a pouring basin part in proximity. CONSTITUTION:The plural cavities 12 constituted of a cope 13 and drag 17 are connected respectively via a gate into the pouring basin 24 in the central part in the stage of casting the cage type rotor to be used for an induction motor, etc. The cope 13 and the drag 17 are preheated to about 250 deg.C and the slots 1b of the rotor iron cores 1 are inserted into the cavities 12 so as to be inserted in the gravity direction. An upper pressure plate 14 is lowered along posts 15 to press and clamp the cope and drag. Molten Al6 is poured through the pouring port of the cope 13 into the pouring basin 24 and is pressurized by an upper punch 23 to force the molten Al through the gate 18 into the cavities. Gas is expelled from vent holes 18 and the molten Al is solidified as the rotor having no blowholes. After the cope and drag are separated, the rotor is pushed out of the drag by ejector bars 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a casting device for a squirrel cage rotor used in an induction motor or the like.

[Conventional technology]

Figure 1 (51), (t)) shows a typical squirrel cage rotor core before casting, with (a) being a partially cutaway front view and (b) being a side view. Inside (11 is a rotor core made of laminated circular steel plates, (1a) is a slot that penetrates in the direction of lamination), and (1b) is a rotating shaft insertion part. Conventional.

This rotor has a slot (1a) and a rotating shaft insertion part (1b).
The rotor conductor is formed by laminating a required number of punched iron plates, for example, by die-casting aluminum, and then inserting the rotating shaft.

Fig. 7 is a vertical sectional view showing a conventional casting device for casting multiple squirrel cage rotors, and Fig. 8 is a side view of the intermediate mold α0 viewed from the side, taken apart along line 1-1 in Fig. 7. in.

In the figure, (2) is a temporary core, (3) is a collar, and (4) is a nut.The rotor core il+ is tightened and integrated with a nut (4) via a temporary core (2) and a collar (3). has been made into

(5) is an extrusion rod for taking out the product after molding, and (6) is aluminum.

Metal material for electrical conductors such as copper, (7) is a sleeve into which the molten metal material (61) is injected, (8) is a plunger that applies casting pressure, (9) is a fixed mold, and +In is an intermediate mold.

aυ is the moving mold, 0 seconds is Ge), and e'4) is the pool.

A conventional squirrel cage rotor die casting device inserts a rotor core fi+, which is integrated with a temporary core (2), a collar (3), and a nut (4), into a cylindrical cavity of an intermediate mold a1. , the intermediate mold α0 and the movable mold housing υ are fixed molds (
9) Apply pressure to clamp the mold. Sleeve (7)
A molten metal material injected into a molten metal material, in this case aluminum (6
) is pressurized by plunger (8) at approximately 1 m/sec at 4 degrees (plunge-v-48) as shown by the arrow,
1.5 m/s through the slot of each rotor core (1) (1a) from the hot water pool part ωxun through the gate 0shi
EC or higher, the slot (1a) and the end ring are filled with high pressure and high speed within 1 second, and after rapid cooling, the mold is opened between the fixed mold (9) and the intermediate mold α1, and the extrusion rod (5) was configured to extrude a large number of molded products.

〔problem〕

Conventional squirrel cage rotor casting equipment is constructed as described above, and the lengths of the gates leading from the sump to each rotor core are different, which prevents air entrainment and solidification shrinkage during molding. The defects (porosity) that occur due to this were different for each rotor core. These defects impede the conduction of the secondary current induced in the rotor, and are a major factor in reducing the rotational torque as a function of motor performance. Therefore, the occurrence of defects (holes) reduces motor performance.

Furthermore, there is a problem in that variations in the occurrence of defects affect variations in motor performance.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a squirrel-cage rotor casting device that can stably produce high-performance motors with few defects (porosity).

[Means for problem solving]

The squirrel cage rotor casting device according to the present invention has a mold with a plurality of cavities into which the slots of the nine rotor cores can be inserted generally in the direction of gravity, and the cavities are radially adjacent to and equidistant from the pool. It was established in

[For production]

In this invention, by minimizing the distance from the pool to the plurality of cavities into which the rotor core is inserted, and by providing the cavities equally radially, the molten metal material can be flowed at an inflow speed of 165 m/s s c. Fill each cavity uniformly with the following laminar flow without entraining air, then apply molten metal material to I! while applying high pressure.
! Let it harden.

〔Example〕

FIG. 1 is a longitudinal cross-sectional view showing a squirrel cage rotor casting apparatus according to an embodiment of the present invention. In the figure, @-a cavity into which the rotor core (1) is inserted in the direction of gravity of its rotating shaft insertion part, (13 is an upper mold, (14) is a mold that applies mold clamping force, and (14) is an application such as a press. The pressure upper plate of the pressure mechanism, housing 9, is a support that connects the upper mold f13 and the pressure upper plate I, and the tilt is provided in the upper mold θ crane, and the cavity (@ trochanter core (12)
) is a presser rod that presses the presser rod, and is installed on the upper mold α3.

07) is a lower mold, which is provided with a pool part (goods) for holding the molten metal material, and a plurality of cavities α2 are arranged, for example, in a radial manner, above the pool surface around the pool part C24+. . αe is at the gate.

The cavity 'Jz and the pool part t241 are connected, and this cross-sectional area is equal to the filling speed when the bath melting metal material is filled into the rotor core + 11 slots (1a) inserted into the cavity U. .5m/see or less. al is a gas vent provided above the cavity α2 on the opposite side of the gate, 121 is an extrusion rod serving as an extrusion means, and 9, for example, a knockout lower plate ■ screwed to the knockout punch Qυ is used to press the knockout punch Qυ.
increases in conjunction with (C) is an upper punch for filling the cavity with metal material.

Figure 2 is a front view of the upper mold α-shaped part taken apart along line U-a in Figure 1 and viewed from below; It is a vertical cross-sectional view seen from the side, and also a fourth
The figure is a front view of the lower die aη taken apart along the i[-ff line in Fig. 1 and viewed from above, and Fig. 5 is a front view of the lower die αη taken apart along the ff-IV line in Fig. 4 from the side. FIG. The hot water pool is formed by the upper mold α pull and the lower mold αη.

(Foundation), Gate 08. The gas vent fi9 has a split structure, and the plurality of cavities ff3 are close to the hot water pool 34, equidistant from each other, and radially radially with respect to the hot water pool Q4.

Next, the operation will be explained. In the squirrel cage rotor casting device described above, the upper and lower molds αJ and αD are preheated to about 250°C, and the rotor core fil is placed in the plural cavities α2 so that the slots (Ia) are in the direction of gravity. Insert into. After that, the upper pressure plate α is lowered, and the upper mold α3 connected by the struts fls is pressed against the lower mold ση to perform mold clamping. Thereafter, a molten metal material (6) such as aluminum is injected into the sump 04) from the injection port of the upper mold a3.

Immediately lower the upper punch ■. The molten metal material (6) in the mixed part Q41 of the lower mold aη is removed by the upper punch Q3, passes through the plurality of gates, and is slotted into the rotor core (1) in the plurality of cavities α2. (1a) and the end ring is filled.

The filling speed at this time is a slow speed of 15 m/sec or less, and the lower end ring is filled from near the gate 0υ, and slowly rises in the slot near the gate α barrel.
Game) Fill the upper end ring near QS and finally reach the gas vent a9. Thereafter, the gold 4 material (6) is cooled and solidified in a molten or semi-molten state while applying a high pressure of about 500 kg/cd.

After solidification, the upper mold is removed and the molded rotor is extruded from below using an extrusion rod.

〔Effect of the invention〕

As described above, according to the present invention, a mold is provided with a plurality of cavities into which the slots of one rotor core can be inserted generally in the direction of gravity in a casting device for casting multiple squirrel cage rotors, and the cavities are It was installed radially close and equidistant from the hot water pool.

A plurality of high-quality squirrel cage rotors with few molding defects (porosity) can be manufactured at the same time.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing a squirrel cage rotor casting device according to an embodiment of the present invention, and Fig. 2 is a front view of the upper mold seen from below when separated along the line ■-II in Fig. 1. . Figure 3 is a vertical cross-sectional view of the injection device taken from the side, taken along line G in Figure 2, and Figure 4 is an exploded view taken along line ff-11 in Figure 1.
A front view of the lower mold αD seen from above, Figure 5 is the ff- of Figure 4.
A longitudinal cross-sectional view of the casting device taken along the TV line and seen from the side; Figures 6 (a) and (+)) are cross-sectional views and side views showing a general squirrel-cage rotor after casting; The figure is a longitudinal sectional view showing a conventional squirrel cage rotor casting device. FIG. 8 is a side view of the casting apparatus taken apart and viewed from the side along line 1--1 in FIG. 7. In the figure, (l) is the rotor core, α2 is the capacity, Q3)
(a7) is the upper mold, a7) is the lower mold, Oe is the gas vent, (19 is the gas venting port, (to) is the upper punch, and Q4 is the water reservoir. In addition, the same reference numerals in Figure 1 indicate the same or equivalent parts.

Claims (1)

[Claims] In a casting device that molds multiple squirrel cage rotors at once, a rotor core is inserted with the slots of the rotor core oriented generally vertically, and multiple squirrel cage rotors formed by an upper mold and a lower mold are inserted. A casting device for a squirrel cage rotor, characterized in that cavities are provided radially in close proximity to and equidistant from a sump provided in the lower mold.