JPH01136544A - Die-casting metal mold of rotor for rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent internal cavities and surface and concave faults in a fin section or a short-circuit ring by providing a vent groove to the fin and the deep ends of cavities for the short-circuit ring, forming a space every one forming cycle into the vent groove and making clean. CONSTITUTION:A detouchable die 12 is separated from a fixed die 8 to open cavities, and a rotor core 2 fixed to a core bar 28 is fitted and secured into a hole 16. Then, the molten metal is poured from a gate 32 after the cavities are closed. Gas in cavities 17 and 18 is discharged from a hole 52 through the vent groove 23 of a backing-play 20. The molten metal is cooled and hardened to form into a slot bar, a short-circuit ring and a fin. A space is made into the vent groove 23 every forming cycle, and is cleaned by a compressed air supply mechanism 47.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Field of Application) The present invention relates to a die-casting mold for a rotor for a rotating electrical machine, particularly for producing an aluminum casting rotor having a squirrel-cage conductor. .

(Prior Art) FIG. 5 shows an example of a cast-in rotor for a rotating electrical machine.
．． Short circuit rings 4 and 5. The fins 6 and 7 are integrally formed by aluminum die casting. FIG. 6 shows an example of a die-cast mold used for molding this rotor for a rotating electric machine. In FIG. 6, reference numeral 8 denotes a fixed mold attached to a fixed platen 9 of the die-casting machine, and has a cavity 10 for forming the short-circuit ring 5 and a cavity 11 for forming the fin 7. On the other hand, 12 is a movable die attached to the movable platen 13 of the die-casting machine, and this moves away from the fixed die 8 across the parting line PL when the die is opened. This movable mold 12 consists of a base body 14 and an auxiliary base body 15.
A cylindrical hole 13 for fitting and mounting the rotor core 2 is formed in the auxiliary base 15, and the base 14 has a cavity 17 for molding the short-circuit ring 4 and a cavity 18 for molding the fin 6. The insert 19 is fitted and attached. Further, reference numeral 20 denotes a backing plate provided in contact with the opposite side of the auxiliary base 15 out of both surfaces of the insert 19.
1 toward the auxiliary base 15 side, and compensates for the clamping force applied to the insert 19 and eventually the iron core 2 to a value within a certain range when the mold is closed.
2.

On the joint surface of the backing plate 20 with the insert 19, a large number of shallow gas vent grooves 23 connected to each cavity 18 are formed radially, and the outer ends of these gas vent grooves 23 in the radial direction are formed into an annular groove 24. They are connected. The annular groove 24 is opened to the outside of the mold via gas exhaust holes 25, 26 and 27 formed in the backing plate 20 and the base body 14.

Molding using a die-casting mold is carried out by inserting the rotor core 2 into the core bar 28 and fixing it with a collar 29, and fitting it into the cylindrical hole 16, and then inserting the plunger sleeve in the mold-clamped state shown in FIG. The molten aluminum injected into the cavity 30 is injected from the sprue 32 by the advance of the plunger 31.
17.degree. 18 and the slot 2a of the rotor core 2, and eventually hardens to form the slot per 3. After being formed into a short ring 4°5 and a fin 6.7, the mold is opened. After opening the mold, the knockout plate 34 with the knockout pin 33 attached is pressed by the knockout rod 35 of the die-casting machine and moves in the direction of protruding the rotor core 2, and -
The molding cycle ends.

(Problems to be Solved by the Invention) By the way, during die casting, the cavity 10,
If the gas in the slots 2a of the rotor core 2 and the slots 2a of the rotor core 2 are not discharged outside of the mold, it will cause a "crowd". is pulled out from the parting line PL and the mating surface of the base body 14 and the auxiliary base body 15 of the movable mold 12, and the remaining part is pushed into the cavity 18, 19. And a gas vent groove 23° annular groove 2 pushed into the cavity 18.19
4 and gas discharge holes 25, 26 and 27 to the outside of the mold. At this time, a clearance of 0.05 to 0.15 ynn+ is provided in the gas vent groove 23 in order to exhaust only the gas out of the mold, but even with this structure, when the molten metal is injected, the molten metal does not leak out little by little. Yes, there is a gas vent groove 23
Since the gas enters the inside and solidifies, the gas venting groove 23 gradually becomes clogged and the gas venting performance deteriorates. Therefore, it is necessary to periodically disassemble the movable mold 12 to clean the gas vent groove 23, and it takes a lot of time to disassemble and reassemble the movable mold 12 for cleaning.

Fig. 7 shows another conventional die-casting mold according to Japanese Patent Application No. 59-199977, in which the same parts as in Fig. 6 are given the same reference numerals, and different parts, that is, gas venting structure parts, are shown. explain.

In FIG. 7, reference numeral 36 denotes a backing plate provided in contact with the opposite side of the insert 19 from the auxiliary base 15. As shown in FIGS. 10 and 11, a groove 37 extending vertically is formed on the surface of the backing plate 36 that is fitted with the insert 19, and grooves 37 are formed on both upper and lower sides of the base body 14 as shown in FIG. Groove 3 of backing plate 36
Holes 38 and 39 connected to 7 are formed vertically through the hole 38 and 39.

A slide plate 40 is inserted into the hole 38 of the base body 14 and the groove 37 of the backing plate 36 so as to be able to reciprocate up and down. It is located at the tip of the. Three gas vent grooves 41 are formed in the lower half of the plate surface of the slide plate 40 on the side facing into the cavities 18, and are connected to each cavity 18.

Note that the gas vent groove 41 is extremely shallow, about 0.05 mm. An air cylinder 42 is fixed to the upper surface of the base 14, and its rod 41a is connected to the upper end of the slide plate 40, so that the air cylinder 42 functions as a driving device for reciprocating the slide plate 40. 43 is a wiper device provided in the lower part of the base body 14 corresponding to the gas vent groove 41, which includes a wiper member 45 held movably in the horizontal direction in the holding hole 44;
compression spring 4 that urges the slide plate 40 toward the slide plate 40 side
6, the knife portion 4 of the wiper member 45
5a always protrudes into the hole 39.

47 is a compressed air supply mechanism, which includes a vent hole 48 formed in the base 14 and a hose 50 connected to one end of the vent hole 48 and connected to a compressor (not shown) via a valve 49.
and a ventilation hole 51 formed in the plate surface of the slide plate 40 so as to communicate between the other end of the ventilation hole 48 and the gas vent groove 41.

Next, the operation of the above configuration will be explained. First, the movable mold 12 is separated from the fixed mold 8 to be in the open state shown in FIG. 9, and the rotor core 2 fixed to the mandrel 28 is fitted into the hole 16. Thereafter, the mold is closed as shown in FIG.
eject from. This injection causes the molten metal to enter the cavity 10.
゜11.17.18 and the slot 2a are filled, but with this filling, the gas inside the fixed mold 8 and the auxiliary base 1
5 and the mating surface between the base 14 and the auxiliary base 15, and finally forced into the cavities 17 and 18, the gas flows through the slide plate 40.
It passes through the gas vent groove 43 and is extracted out of the mold from the hole 39. Then, the injected molten metal cools and solidifies, and the slotper 3.
After being formed into the shorting rings 4, 5 and fins 6.7, the mold is opened as shown in Fig. 3, and in this state the knockout pin 3 is removed.
3 is pushed and pulled back by the knockout rod 35, so that the rotor core 2 is projected from the hole 16 by the knockout pin 33. After this, the rod 41a of the air cylinder 42 reciprocates to lower and raise the slide plate 40.

Then, the lower half of the slide plate 40 protrudes from the groove 37 of the backing plate 36 into the hole 39 and returns to the groove 37 again, causing the knife portion 45a of the wiper member 45 to degas. It comes into contact with the inner surface of the groove 41, and when the molten metal is injected, it penetrates into the gas vent groove 41 and scrapes off the solidified aluminum.

After the slide plate 40 rises, the valve 49 opens, and compressed air is supplied into the gas vent groove 41 through the hose 501 vent hole 48 and vent hole 51 in order, and the wiper member 45 scrapes off the aluminum. Blow away the debris. One molding cycle is completed by the above, and after this,
A new rotor core 2 is fitted into the hole 16 and the next molding cycle is started.

In this way, - at the end of each molding cycle, the gas venting groove 41
is cleaned by the wiper device 43 and compressed air supply mechanism 47.

However, with this structure, some of the aluminum debris scraped off by the wiper device 43 remains in the gas venting groove 41, but this gas venting groove 41 has a depth of approximately 0.05+++ m.
Because it is so shallow, there is not enough compressed air to blow through it to blow away the aluminum debris. For this reason, as the molding cycle is repeated, aluminum debris accumulates and blocks the gas vent groove 41, making it impossible for the gas in the cavities 17 and 18 to be sufficiently discharged to the outside of the mold. Then, the fins 6 and the short-circuit ring 4 on the opposite side of the rotor 1 to the side where the gates are provided have the disadvantage of causing internal cavities and surface concave defects. In addition, aluminum debris accumulates in the gap between the slide plate 40 and the hole 38 of the movable mold 14, which prevents the slide plate 40 from moving downward and upward smoothly, reducing the degassing effect and causing serious problems with the mold. Sometimes it happened.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to easily clean the gas vent groove without the need for extensive disassembly and reassembly of the mold, thereby eliminating problems caused by poor gas venting. It is an object of the present invention to provide a die-casting mold for a rotor for a rotating electric machine, which prevents internal cavities and surface concave defects from occurring in a fin portion or a short-circuit ring.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes a conductor penetrating through the slot of a rotor for a rotating electric machine, and an annular short circuit that shorts both ends of each conductor. In a die-casting mold for forming a ring and a fin portion protruding from its short-circuit ring by die-casting, the mold for forming the fin and short-circuit ring is placed on the side opposite to the side where the sprue for injecting the conductive material is provided. A mechanism is provided to divide and form a space between the fin and short-circuit ring part and a backing plate part provided with a gas vent groove at the rear end of the fin when opened, and to supply compressed air to the space. The present invention provides a die casting mold for a rotor for a rotating electric machine.

(Function) With this structure, the fins on the side opposite to the side where the sprue of the rotating electric machine rotor is provided and the gas venting grooves provided at the back end of the cavity for the short-circuit ring are free from pars that occur during die-casting. Since no gas remains, the gas existing in the cavity does not stagnate in the mold, but passes through the gas venting groove and is efficiently discharged out of the mold.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Parts that are the same as those in FIGS. I will only explain.

That is, 12 is a movable type installed on the movable platen 13 of the die-casting machine, and is composed of a base body 14 and an auxiliary base body 15.
A ring 51 having a cylindrical hole 16 into which the rotor core 2 is fitted is fitted onto the auxiliary base 15 . In addition, an insert 19 having a cavity 17 for forming the short-circuit ring 4 and a cavity 18 for forming the fin 6 is fitted into the base 14, and the inner end of the insert has several holes 52 communicating with the outside of the mold. have. A backing plate 20 is provided in contact with the opposite side of the insert 19 from the auxiliary base 15. A guide hole 54 for attaching a spring 53 is provided on the surface of the insert 19 on the backing plate 20 side, and the insert 19 and ring 51 can be separated from the backing plate 20 by the spring 52. 55 is the backing plate 20 and the insert 19. A plurality of stoppers are used to restrict the movement of the ring 51 and are fixed to the auxiliary base 15. Furthermore, 47 is a compressed air supply mechanism, and the base 1
4 and a hose 50 connected to one end of the vent hole 48 and connected to a compressor (not shown) via a valve 49.

First, the movable mold 12 is separated from the fixed mold 8 to open the mold, and the rotor core 2 fixed to the mandrel 28 is fitted into the hole 16. Thereafter, the mold is closed as shown in FIG. 1, and in this state, the molten aluminum serving as the molding material in the plunger sleeve 30 is injected from the gate 32 by advancing the plunger 31. Through this injection, the cavities 10, 11, 17.18 and the slots 2a are filled with the molten metal, but as a result of this filling, the internal gas is released from the mating surfaces of the fixed mold 8 and the auxiliary base 15, and between the base 14 and the auxiliary base 15. Finally, it is pulled out from the mating surface of cavity 1.
The gas forced into 7.18 passes through the gas vent groove 23 of the backing plate 20 and exits from the hole 52 to the outside of the mold. After the injected molten metal is cooled and solidified and formed into the slotper 3° short-circuit rings 4, 5 and fins 6.7, the mold is opened as shown in FIG. The rotor core 2 is pushed out and pulled back by the knockout pin 3.
Protruded by 3. At this time, the ring 51 having the insert 19 and the hole 16 is separated from the backing plate 20 to form a space 56. The case 49 is opened, and compressed air passes through the hose 501 and the vent hole 48 in order to blow away the aluminum debris stuck in the gas vent groove 23. The aluminum scraps are then discharged out of the mold through the holes 52 or 16. At this time, by spraying a mold release agent (not shown) and subsequently blowing compressed air from the fixed mold 8 side of the movable mold 12, the aluminum adhering to the gas vent groove 23 can be completely discharged from the mold.

As described above, the molding cycle is completed, and thereafter, a new rotor core 2 is fitted into the hole 16 and the next molding cycle is started.

In this way, - at the end of each molding cycle, the gas venting groove 23
Since a space 56 is formed in the space 56 and cleaned by the compressed air supply mechanism 47, a normal gas venting passage is always ensured and a good gas venting effect is exhibited. Therefore, the occurrence of internal cavities and surface concave defects due to residual gas in the fins 6 and short-circuit ring 4 of the rotor 1 is prevented as much as possible.

Further, since the gas vent groove 23 is an extremely shallow groove that is difficult for molten metal to enter, almost no particles that need to be removed by post-processing occur.

(Other Embodiments) FIGS. 3 and 4 show a second embodiment.
The difference from the embodiment is that the auxiliary base 15 having a hole 16 and a ring 51 for fitting and mounting the rotor core 2 is a three-piece type that is separated from the base 14 of the movable mold 12 and opened. It is.

That is, 57 is an intermediate mold that is located between the fixed mold 8 and the base 14 of the movable mold 12 and is separated from the fixed mold 8 and the base 14 when the mold is opened. The child 1 is taken out by a loader device (not shown) placed outside the die-casting machine. The intermediate mold 57 has a hole 16 into which the iron core 2 is mounted. The base 14 of the movable mold 12 has a cavity 17 for molding the short-circuit ring 4.
and a nest 58 having a cavity 18 for molding the fin 6
is a fitting device, and the inner end of the insert 58 has a hole 5 leading to the outside of the mold.
2 are installed in several places. 59 is the backing plate 20
and a stopper for regulating the movement of the insert 58, and a plurality of stoppers are fixed to the base body 14.

Even in such a structure, the effects are the same as in the first embodiment.

[Effects of the Invention] As explained above, the present invention eliminates the need for large-scale disassembly and reassembly of the mold, and by easily cleaning the gas vent groove, eliminates internal cavities and surfaces caused by poor gas venting. This has the excellent effect of preventing concave defects from occurring in the fin portion or the short-circuit ring.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a vertical sectional side view showing the mold in the closed state, and FIGS. 2(a) and 2(b) show the mold in the open state. In the fixed platen, (b) is a longitudinal sectional side view of the base body and movable platen, respectively, FIGS. 3 and 4 show the second embodiment, FIG. 3 is a view equivalent to FIG. 1, and FIG. 4(a) b)
(c) is the mold open state, (a) is the fixed plate (b) is the intermediate mold (
c) is a longitudinal cross-sectional side view of the base body and movable platen, FIG. 5 is a diagonal view of the rotor, and FIG. 6 is a conventional die casting mold.
Figure 7 is a diagram equivalent to Figure 1 showing the second conventional mold, Figure 8 is a partial front view of the movable mold, and Figures 9 (a) and (b).
1 shows the mold open state, a) is a side view of the base body and a movable plate (b) is a side view of the fixed plate, FIG. 10 is a front view of the slide plate and backing plate, and FIG. 11 is the X in FIG. 10.
It is a sectional view taken along line I-XI. 2... Iron core, 8... Fixed type, 12... Movable type, 19... Inset, 20... Backing plate,
23... Gas vent groove, 28... Core bar, 32...
Gate, 47... Compressed air supply mechanism, 51... Ring, 53... Spring, 55... Stopper. Figure 5 Figure 6 Figure 7 Figure 8 tlA Figure 7 4/ Figure 10 Figure 11

Claims (1)

[Claims] In a die-casting mold for forming, by die-casting, a conductor passing through a slot of a rotor for a rotating electric machine, an annular short-circuit ring that short-circuits both ends of each conductor, and a fin portion that protrudes from the short-circuit ring. The mold that forms the fins and short circuit ring on the side opposite to the side where the sprue for injecting the material is installed,
A mechanism is provided to divide and form a space between the fins and short-circuit ring portion and a backing plate portion provided with a gas vent at the rear end of the fin when the mold is opened, and to supply compressed air to the space. A die-casting mold for a rotor for a rotating electric machine.