JPS5913562A - Forming device for rotor - Google Patents

Abstract

PURPOSE:To enable the formation of a rotor iron core of any thickness when the outside diameter of the rotor iron core is the same and to prevent the generation of fins, by forming conductors and end rings while the rotor iron core is held in place under pressure between the 1st and the 2nd molds. CONSTITUTION:A rotor iron core 5 is inserted to the inside of a guide 14, and is placed on a bottom mold 4. Forming molds 1 are thereafter clamped and a top mold 2 descends until it comes into tight contact with the top surface of a middle mold 3. On the other hand, a bottom mold 4 ascends and a curved plate 15 enters the inside of a deep groove 13 until it contacts the bottom surface of the mold 3. Then, the core 5 receives the pressing force of a hydraulic cylinder or the like which is a driving source for moving the same upward. The core is thus strongly held in place under pressure between the mold 3 and the mold 4. The melt of Al in this state is forcibly fed into a cavity 7 through a runner 9 and a sprue 10; further, the molten metal is forcibly fed into a cavity 12 through the closed slot 5a of the core 5. Thereafter, the molten metal is cooled to solidify, whereby conductors 18 and end rings 6, 11 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotor molding apparatus for die-casting conductors and end rings on a rotor core.

[Technical background of the invention]

Conventionally, this type of molding device has two circular parts C each having a depth d into which the lower die AK rotor core B is fitted, and an annular recess E for molding one end ring D, as shown in FIG. An annular recess H for molding the other end ring G in the upper mold F and a goo J for supplying molten metal to this recess H.
Then, the rotor core B is fitted into the circular recess C, and the lower mold A and the upper mold F are butted and clamped, and molten metal is injected from the gate J to attach the conductor to the end ring D. ,G
This is a configuration for molding.

[Problems with background technology]

It is only possible to mold rotor cores with the same thickness as the depth d of the four circular portions C, and separate molds must be manufactured for rotor cores with different thicknesses. In addition, since the rotor core B is formed by laminating a large number of punched steel plates, there will be slight variations in the five dimensions of the thickness, and when the molds are clamped, the lower mold A and the upper mold F will not completely butt each other. There is a problem in that a gap may be formed between the two, resulting in so-called "paris".

[Purpose of the invention]

It is an object of the present invention to be particularly suitable for a closed slot type rotor core, and to be able to mold rotor cores with the same diameter with the same mold even if they have different thicknesses, and to avoid the risk of causing paris. There is no rotor forming equipment to provide.

[Summary of the invention]

The present invention is configured such that the rotor core is clamped between the two molds by clamping the first mold and the second mold having concave portions for molding the end ring. By providing a guide that fits and holds the outer periphery of the rotor core in one of the molds so as to be expandable and retractable in the axial direction, the rotor core can be moved between the first mold and the second mold regardless of the thickness of the rotor core. The purpose is to enable the conductor and end ring to be molded in a clamped state.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. First, in FIG. 1, 1 is a mold, and this mold 1 is composed of an upper mold 2, a middle mold 6 as a first mold, and a lower mold 4 as a second mold. , the middle mold 3 has an annular four part 7 formed on its lower surface for forming an upper end ring 6 (see Fig. 5), which is one end of the rotor core 5, and also has a diameter concentrically with the four part 7. large annular groove 8
Also, a sprue 10 is formed to guide hot water supplied from a runner 9 formed in the upper mold 2 to the four parts 7. The lower mold 4 has four annular parts 12 formed on its upper surface for molding a lower end ring 11 (see FIG. 5), which is the other end of the rotor core 5, and the annular groove is formed around the four parts 12. A plurality of arc-shaped deep grooves 13 are intermittently formed so as to be located on one circumference having the same diameter as 8. Reference numeral 14 denotes a guide, and as shown in FIG.
It is inserted into the deep groove 13 from above to form a substantially cylindrical shape as a whole, and the length of protrusion from the upper surface of the lower mold 4 changes as it protrudes and retracts from the deep groove 13, that is, it can expand and contract. It is configured. In addition, a plurality of curved plates 15
The inner diameter of the guide 14, which has a substantially cylindrical shape, is
It is set to be approximately the same as the outer diameter dimension of the rotor core 5. 1
Reference numeral 6 denotes a plurality of screws screwed into the lower surface of the lower mold 4 corresponding to each of the deep grooves 15, and screws 16 facing inward at the lower ends of the deep grooves 15.
A compression spring 17 is interposed between the tip of the curved plate 15 and the curved plate 15 . Each curved plate 15 is urged upward by a compression spring 17, and when the lower mold 4 is separated from the middle mold 6 as shown in FIG. It is in the state where it is pushed up and protrudes the longest from the lower die 4.

First, the operation of the above configuration will be explained. First, as shown in FIG. 1, the rotor core 5 is inserted inside the guide 14 and placed on the lower mold 4. The guide 14 fits into the outer circumferential portion of the rotor core 5 and holds the rotor core 5 in a normal position in relation to the lower die 4 .

Thereafter, the mold 1 is clamped, and the upper mold 2 is lowered and brought into close contact with the upper slat of the middle mold 6. On the other hand, the lower die 4 rises, and as it rises, the upper end of the curved plate 15 forming the guide 14 first enters the annular groove 8 of the middle die 6 as shown in FIG.
It comes into contact with the upper back surface and stops at that position. After this, the lower mold 4 rises independently, and the curved plate 15 moves relatively into the deep groove 13 against the spring force of the compression spring 17, so that the protruding length from the lower mold 4 is reduced. It's shrinking. As the lower die 4 rises, the rotor core 5 slides within the guide 14 and finally comes into contact with the lower surface of the middle die 3.

Then, the rotor core 5 receives a pressing force from a hydraulic cylinder (not shown) or the like which is a driving source for raising the lower mold 4, and is strongly clamped between the middle mold 3 and the lower mold 4. In this state, the molten AYV minium is forced into the recess 7 through the runner 9 and the sprue 10, and further into the recess 12 through the closed slot 5a of the rotor core 5. And the hot water is four parts 12. The closed slot) 5a and the four parts 7 are filled in this order, and then cooled and solidified to form the conductor 18 and the end ring 6.11.
is formed. After completion of molding, the mold 1 is opened as shown in FIG. 2, and the curved plate 15 of the guide 14 is pushed up to its original longest protruding state by the spring force of the compression spring 17.
According to this embodiment, the rotor core 5 is clamped between the middle mold 5 and the lower mold 4, and hot water is supplied in this state to remove the rotor core 5 from inside the conductor 1.
8 and the end ring 6.11, it is possible to mold any thickness of the rotor core as long as it has the same outer diameter. Also, guide 1
4 to fit and hold the rotor core 5, the position of the rotor core 5 with respect to the middle mold 3 and the lower mold 4 is determined correctly, and problems such as end rings 6 and 11 being molded eccentrically do not occur. . Moreover, the rotor core 5 has both upper and lower end surfaces brought into close contact with the middle mold 3 and the lower mold 4 by the clamping force of the middle mold 3 and the lower mold 4, and the punched steel plates constituting the rotor core 5 are also brought into close contact with each other by the clamping force. Therefore, even if Paris occurs, hot water will not leak out.

In the above embodiment, the guide 14 is composed of a plurality of curved plates 15, but it may be formed integrally into a cylindrical shape. Further, the guide 14 may be provided on the side of the medium mold 3, and furthermore, the mold 1 may be arranged horizontally.

〔Effect of the invention〕

As explained above, the present invention has a configuration in which the conductors and end rings are formed while the rotor core is pressed between the first and second dies, so that if the outer diameter of the rotor core is the same, , the rotor core of any thickness can be molded, it has excellent versatility, and there is no risk of paris generation (il
-Play.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a conventional molding die, FIGS. 2 to 5 show an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the entire mold shown in an open state, and FIG. The figure is a cross-sectional view taken along the toe line in FIG. 2, FIG. 4 is a vertical cross-sectional view showing the middle of the mold clamping process, and FIG. 4 is a vertical cross-sectional view showing the molding state. In the figure, 1 is the mold, 3 is the middle mold (first mold), and 4 is the lower mold (
2nd type), 5 is the rotor core, 6.11 is the end ring, 7-12 is the recess, 14 is the guide, 17 is the compression spring, 1
8 is a conductor. Figure 1 M 2 Figure 3 Figure 15 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a device for die-casting a conductor and an end ring on a rotor core made of a laminated core, a first mold having four parts for molding an end ring on one end of the rotor core, and other parts of the rotor core. A molding die comprising a second mold having a recessed portion for molding an end ring on the end side, and clamping the rotor core between the first and second molds by clamping the mold;
A rotor comprising a substantially cylindrical guide provided on one of the first and second molds so as to be expandable and retractable in the axial direction of the rotor core, and to fit and hold an outer peripheral portion of the rotor core. Iron core forming equipment.