JPH0458749A - Caster for squirrel-cage rotor - Google Patents

Abstract

PURPOSE:To enhance strength at the gate cutter part of a temporary shaft and to simplify the machining profile of lower die by disposing a groove type gate part on the outer circumference of the upper cutter of the temporary shaft thereby constituting the gate mainly of the temporary shaft. CONSTITUTION:Required number of rotor cores 1 are stacked on a temporary shaft 3 and a predetermined quantity of molten conductor material is poured into the molten sump 7a of a sleeve 7. A lower die 4 is then disposed at a predetermined position and the rotor cores 1 stacked on the temporary shaft 3 are mounted thereon. Consequently, a gate 3a to be filled with conductor material 2 is formed. An upper die 5 preset on a moving table 6 is then lowered to press the rotor cores 1. When a press plunger 8 is lifted under this state, molten conductor material flows through the gate 3a, the lower die 4 and the rotor cores 1 and filled in the upper die 5. When the rotor cores 1 are mounted on a rotor base 10 and the temporary shaft 3 is pressed by means of a rod 9, the temporary shaft 3 lowers to cut the gate 3a and separates a biscuit 2e.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the manufacture of squirrel cage rotors, and in particular to a process for pressurizing and filling a rotor core with molten conductor material to form rotor conductors. This relates to casting equipment.

[Conventional technology]

Figures 4a and 4b show a general cage-shaped rotor core before casting, where a is a partially cutaway front view showing a cross section, and b is a side view of the core. is a laminated core,
la is the disk-shaped steel plate, lb is a slot, and 1c is a hole for inserting a rotating shaft. Further, FIG. 4C shows a general squirrel cage rotor after casting. In the figure, 2 is a conductor material, 2a and 2b are end rings, and 2c and 2d are fins.

Next, FIG. 5a is a sectional view showing a conventional squirrel cage rotor casting apparatus. In the figure, 1 is a rotor core, which is laminated on a temporary shaft 3. 4 is a lower mold, the top view of which is shown in the same figure. That is, 4a is an end ring forming part, 4b is a fin forming part, and 4c is a gate formed by combining with the temporary shaft 3. 7 is a sleeve, 8 is inserted into this sleeve 7,
FIG. 6a shows the 0th order which is the plunger tip forming the pool 7a.

b shows the state of gate cutting after completion of filling, 9 shows the pressure rod, 1O shows the rotator sac, and 2e shows the biscuit.

Next, the operation will be explained. First, rotor core 1 is attached to temporary shaft 3.
Next, after pouring a predetermined amount of molten conductor material into the pool 7a of the sleeve 7, a predetermined portion of the lower mold 4 on which the laminated rotor core l is placed on the temporary shaft 3 is laminated. position, thereby forming the gate 4c. Next, the upper mold (
(shown in FIG. 1) is lowered to pressurize the rotor core 1,
When the pressurizing plunger 8 is raised in this state, the molten conductive material passes through the gate 4C and is filled into the lower mold 4, the rotor core 1, and the upper mold. When the filling is completed, the pressure on the rotor core 1 is released, the mold is opened, and the rotor core 1 is taken out from the lower mold 4.Then, as shown in No. 67a, the rotor core 1 is placed on the rotor sac and the 10 and pressurizes the temporary shaft 3 with an ejector rod, the temporary shaft 3 descends downward and separates the biscuit 2e with its cutting blade 3C. Note that FIG. 6 shows the state in which cutting has been completed.

[Problem to be solved by the invention]

In the conventional casting apparatus as described above, in the gate structure formed by fitting the lower mold and the temporary shaft, the gate is mainly formed by the lower mold (FIG. 5b).

For this reason, the gate cutting blade portion 3C of the temporary shaft 3 cannot be made thicker.
Therefore, there was a problem that the strength of the blade portion was insufficient when cutting the gate, and it was difficult to process the gate forming portion of the lower mold.

This invention was made to solve the above-mentioned problems, and aims to provide a casting device that can increase the strength of the gate cutting blade of the temporary shaft and easily process the shape of the lower mold. do.

[Means to solve the problem]

The casting device according to the present invention is configured such that the gate formation by the lower mold and the temporary shaft is mainly formed by the temporary shaft by arranging a groove-shaped gate part on the lower outer periphery of the upper cutting blade of the temporary shaft. This is what I did.

[Effect]

By forming the gate in this invention mainly by the temporary shaft, it is possible to increase the strength of the gate cutting blade portion of the temporary shaft and to simplify the shape of the lower mold.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Figures 1a and b are a cross-sectional view and a plan view of the lower mold showing the state of completion of filling, and Figure 2 is a detailed view of the temporary shaft.
1 is a rotor core laminated on a temporary shaft 3, 2 is a conductor material, 4 is a rotor core laminated on a temporary shaft 3;
is a lower mold, and an end ring forming part 4a is formed between it and the temporary shaft 3. Here, the temporary shaft 3 has a groove-shaped gate 3a between it and the lower mold 4 at the lower part of the cutting blade 3c. form.

3b is a contact surface (reinforcement rib) with the lower mold.

In addition, 5 is an upper mold, 6 is a moving table, 7 is a sleeve, and 8
is a plunger tip that is inserted into the sleeve 7 and forms a water reservoir 7a. In the lower mold 4 of Figure 1, 4a
4b is an end ring forming part, 4b is a fin forming part, and the corresponding gate part 4c in FIG. ing.

Next, the operation will be explained. First, rotor core 1 is attached to temporary shaft 3.
After pouring a predetermined amount of molten conductive material into the pool 7a of the sleeve 7, the lower mold 4 is placed in a predetermined position, and the laminated rotor core 1 is placed on the temporary shaft 3.

As a result, a gate 3a for filling the conductive material 2 is formed. Next, the upper mold 5, which has been attached to the moving table 6 in advance, is lowered to pressurize the rotor core 1. When the pressurizing plunger 8 is raised in this state, the molten conductive material passes through the gate 3a and is filled into the lower mold 42, the rotor core 1, and the upper mold 5. When the filling is completed, the pressure applied by the moving table 6 is released, the mold is opened, and the rotor core 1 is taken out. Next, as in the conventional example shown in FIG. , cut the gate to separate the biscuits 2e.

In the embodiment, the contact surface (reinforcing rib) between the temporary shaft 3 and the mold 4
3b shows four, but depending on the diameter of the temporary shaft and the required gate area, the contact surface (reinforcing rib)
You may change the number of

Further, as shown in FIG. 3, if the temporary shaft 3 is divided into a temporary shaft tip 3e having a gate forming portion and a gate cutting blade portion, and a shaft portion 3d to form a combined temporary shaft 3, the gate portion It is also possible to quickly respond to wear, damage, etc.

〔Effect of the invention〕

As described above, according to the present invention, the gate is formed mainly by the temporary shaft, which simplifies the processing shape of the lower mold and ensures the strength of the gate cutting edge of the temporary shaft. , can increase the cutting ability of the gate.

[Brief explanation of drawings]

Fig. 1a is a sectional view showing an embodiment of the present invention, b is a plan view of the lower mold, Fig. 2 is a temporary shaft according to the invention, a is a front view, b is a plan view, 3 is an exploded view of a temporary shaft according to another embodiment of the present invention, and 4a and 4b are partially sectional front views showing a general rotor core. and a side view, Figure 4C is a sectional view showing the rotor core after general casting, Figure 5a is a sectional view showing the usage status of a conventional mold, and Figure 5A is the lower mold. top view of the mold,
FIG. 5C is a front view of the tentative shaft, FIG. 6a is a cross-sectional view before the gate is cut, and FIG. 6b is a cross-sectional view after the gate is finished. In the figure, 1 is the rotor core, 2 is the conductor material, 3 is the temporary shaft, 3a
3b is a rib, 4 is a lower mold, and 4a is an end ring forming part. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A rotor core formed by laminating circular steel plates and having slots penetrating in the lamination direction, a conductor material filled in the slots, and formed on both end surfaces of the rotor core,
A squirrel cage rotor casting device comprising an end ring connected to the conductive material, and a fin formed on an end face of the end ring and connected to the conductive material together with the end ring, wherein the rotor core In a device that forms a gate portion that directly communicates with the lower end ring forming portion by fitting the temporary shaft inserted into the lower end ring with the lower mold forming the lower end ring, the lower outer periphery of the upper cutting blade of the temporary shaft is formed. A casting device for a squirrel cage rotor, characterized in that it is provided with a groove-shaped gate part, and the gate part is mainly composed of a temporary shaft.