JPS5863048A - Core for die casting rotor - Google Patents

Abstract

PURPOSE:To eliminate skew process by tools and strengthen a die casting rotor core, by a method wherein a plurality of slots set on a rotor steel plate are made small, and cut-up projections on the inner diameter side of the small slots are sequentially caulked and laminated. CONSTITUTION:A plurality of the slots 12 on laminated iron sheets 11 for a die casting rotor are made small 16. Then, cut-up projectins 15 for caulking are made near the small slots 16, on the inner dismeter 13 side. The plurality of laminated iron plates 11 are twisted a little in the circumferential direction so that each of the cut-up projections 15 is pressed in one by one, and caulked to provide a die casting rotor core. Although notches 14 used as lubricant paths are made in the inner diameter 13, no problem occurs to obtain a rainforced die casting rotor core because the cut-up calking projections 15 are near the slots 16, making caulking pitch greater.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a laminated iron core for use in a die-cast rotor.

Figure 1 shows the laminated iron core used in conventional die-cast rotors.
This will be explained with reference to FIG. FIG. 1 is a plan view of a conventional laminated iron plate for a die-cast rotor, and 1 is a laminated iron plate for a rotor;
2 is a slot, 6 is an inner diameter, and 4 is a notch for passing lubricating oil. Such a laminated iron plate 1 for a die-cast rotor is manufactured by simultaneously punching out the same material as the laminated iron plate for a stator using a press. The die cast rotor laminated iron plate 1 punched in this way is laminated with several tens of sheets so that the lubricating oil passage notches 4 are the same in the axial direction, and then activated by a jig using a part of the slot 2. After being skewed for improvement, it was fixed with a core metal to produce a die-cast rotor core 5 as shown in FIG.

By die-casting this die-cast rotor core 5 using a die-cast manon, the secondary conductor 7 is formed by integrally filling the inside of the tapping slot 2 and the aid ring part 6 with pure aluminum as shown in FIG. Ta. The method using this core metal 8 is not easy to handle when the metal core 8 is skewed, that is, it has good adhesion due to the cracks etc. that occur when the laminated iron plate 1 for a die-cast rotor is punched by a press, and when the metal core 8 is skewed, it is irregularly skewed. Sometimes there were defective products. Furthermore, the use of the skew jig and the core bar 8 has the drawback of increasing production costs.

An object of the present invention is to manufacture a die-cast rotor with high precision and at low cost.

The present invention aims to eliminate a part of the laminated iron plate for a die-cast rotor in order to eliminate the process of skewing using a jig and the core metal used for temporary fixing after the skew in the conventional die-cast rotor. We have devised a method to make the shape of the protrusion even stronger in a method in which a part of another laminated iron plate for the rotor is successively laminated on this part by caulking.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. 11 is a laminated iron plate for die-cast rotor, 12
1 is a slot, 13 is an inner diameter, 14 is a notch for a lubricating oil passage, 1
Reference numeral 5 denotes a cut-out portion for continuously caulking the laminated iron plate 11 for a die-cast rotor. A laminated iron plate for a die-cast rotor is formed by providing such a cut-out portion 15 in the vicinity of the small slot 16 provided between a portion of the slot 12 and sequentially press-fitting the switching portion 15 in the manner shown in Fig. 5. They are laminated by caulking without being slightly twisted in the circumferential direction. Therefore, by temporarily stopping the press fit when a desired number of sheets are laminated and fixed, one die-cast rotor core 17 is manufactured as shown in FIG. 6. That is, since the die-casting iron core 17 is completed in the mold of the punching press, the conventional core metal for die-casting rotor iron core 17 eliminates the skew work, and at the same time, the core metal 17 for temporarily fixing the laminated iron plate for die-casting rotor with skew is removed. There is no need for large-scale work, and there is also no need for core metal, which is an extra jig and tool, which has the advantage of shortening work time and making equipment cheaper. Therefore, the die-casting operation can be carried out immediately after the pressing operation, and an excellent rationalized production line can be organized. In addition, at this time, the crimping protrusion is provided near the slot, which increases the crimping pitch, exhibiting stronger crimping ability, and advantageously dealing with deformation during mold clamping during die casting. be. In addition, even if a notch for the lubricating oil passage is provided on the inner diameter where the rotating shaft is inserted, the protrusion for force 7 will not reach the outer periphery.
By locating it at 11, it has the advantage that the degree of deformation can be reduced during internal diameter machining.

As described in detail above, according to the method for manufacturing an iron core for a die-cast rotor according to an embodiment of the present invention, a plurality of the slot groups of a laminated iron plate for a die-cast rotor are made into small slots, and a cut-out portion for caulking is formed near the inner diameter side of the slot group. Set up this incision! A core for a die-cast rotor can be made in a press mold by sequentially moving the core in one direction around the circumference and crimping it in, and as in the present invention, the core for a die-cast rotor has a notch for a lubricating oil passage on the inner diameter. In this case, by placing the riveting part on the outer circumferential side, the riveting pitch becomes larger, which has the advantage of increasing the force 77 strength during lamination.

[Brief explanation of the drawing]

Figure 1 shows the performance of a conventional die-casting rotor! - A plan view of an iron plate, FIG. 2 is a conventional iron core for a die-cast rotor, FIG. 6 is a conventional die-cast rotor, FIG. 4 is a plan view of a laminated iron plate for a die-cast rotor according to an embodiment of the present invention, and FIG. FIG. 6 is a detailed view of a caulked cut edge of a laminated iron plate for a die-cast rotor according to an embodiment of the present invention, and FIG. 6 is a diagram of an iron core for a die-cast rotor according to an embodiment of the present invention. 1.11... Laminated iron plate for die casting, 2.12...
Slot), 3.13... Inner diameter, 4.14... Notch for lubricating oil passage, 15... Notch, 16... Small slot. '#1 Stem arrangement 3 diagram A1.511i! lll

Claims (1)

[Claims] 1. In a die-cast rotor core, a rotor steel plate is provided with a plurality of slots, some of which are made into small slots,
A method for manufacturing a die-cast rotor core, characterized in that a cutout is provided at a position on the axis side of the small slot, and the cutout is press-fitted into a separate part of the rotor steel plate. 2. The method of manufacturing a core for a die-cast rotor according to claim 1, wherein a small slot and a combination part having a cutout part on the axis side of the small slot are provided in the same number as the number of motor poles. 5. The method for manufacturing a die-cast rotor core according to claim 2, wherein two notches are provided on the inner peripheral side of the rotor steel plate.