JP3013959B2 - Castor manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cast rotor as a motor part with high quality.

[0002]

2. Description of the Related Art As a conventional method for manufacturing a cast rotor as a motor part, a hole for a core rod is formed in the center and a number of small holes are formed at appropriate intervals. A large number of thin plates are laminated via a core rod to form a semi-finished product, this semi-finished product is set in a mold, and the small holes communicating holes and the upper and lower ends of the semi-finished product are filled with a molten metal by die casting to solidify. A solid and fixed method is employed. However, in the method for manufacturing a cast rotor as described above, since the molten metal is cast by the die casting method to make the hollow portion solid and to fix the thin plate, the drawbacks of air, which are disadvantages of the die casting method, occur. There was a problem that a high quality product could not be obtained. The present invention has been made in view of the above problems, and has as its object to provide a method for manufacturing a cast rotor without causing air entrainment or contraction.

[0003]

In order to achieve the above-mentioned problem, a method for manufacturing a cast rotor according to the present invention comprises preparing a lower mold having a concave cavity, an upper mold having a cylindrical shape, and a pressure punch. On the other hand, after inserting a semi-finished product obtained by laminating a number of thin plates with a number of small holes through a core rod in the center and inserting the upper die into the lower die, the upper die is placed on the lower die and The semi-molten billet is put into the semi-finished billet, and the semi-molten billet is pressurized by a pressure punch to spread over the communicating small holes of the semi-finished product and the upper and lower ends thereof to solidify.

[0004]

According to the present invention, by adopting the above solution, the material for fixing the thin plate by extending the communicating small hole portion of the semi-finished product and the upper and lower ends thereof is a semi-molten billet. Since the filling is performed by forcibly pressing and pressing with a pressing punch, a high-quality cast rotor can be manufactured without the occurrence of air entrainment and the like.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. First, as a facility, as shown in FIG.
An upper mold 20 and a pressure punch 30 are prepared. The lower mold 10 has a concave cavity-11, and the concave cavity-11
The bottom of 11 is formed on the lower tapered step 12 and is provided with a product pushing mechanism (not shown). Upper mold 2
0, it is formed in a cylindrical shape having a hollow portion 21 having a diameter slightly smaller than the inner diameter of the concave cavity 11 of the lower die 10. Are formed. Further, a semi-finished product 40 as shown in FIG. In the semi-finished product 40, a thin plate 43 in which a core rod hole 41 is formed at the center and a large number of small holes 42 penetrating vertically at an intermediate position at appropriate intervals is formed with respect to the multiple core rods 44. The core rod hole 41 is penetrated and the small holes 42 and 42 are communicated to be laminated.

A procedure for converting the semi-finished product 40 into a product using the equipment prepared as described above will be described. The semi-finished product 40 is inserted into the concave cavity 11 of the lower mold 10. At this time, the lower end of the core rod 44 is erected at the center of the bottom surface of the concave cavity 11, and the lower surface of the lowermost thin plate 43 and the concave cavity
11 small holes 42.42 in communication with the lower tapered surface
Is defined, and the upper surface of the uppermost thin plate 43 is at the same level as the upper surface of the lower die 10. Next, after the cylindrical upper mold 20 is placed and pressed on the upper part of the lower mold 10, a required volume of the semi-molten billet R is charged into the hollow portion 21, and the state shown in FIG. 3 is obtained.

Next, the pressing punch 30 is operated to move the upper die 20.
Are pressurized and inserted into the hollow portion 21 to press the semi-molten billet R to form small holes 42 and 42 in communication with each other as shown in FIG.
And the closed space S, and the space defined by the lower surface excluding the protrusion 31 of the pressure punch 30 and the upper surface of the uppermost thin plate 43, and the state is maintained until the semi-molten billet R solidifies, Manufacturing castors. Next, the pressure punch 30 and the upper mold 20 are raised to open the upper surface of the lower mold 10, and then the cast rotor is extruded upward from the lower mold 10 via a product extrusion mechanism (not shown), and the manufactured cast rotor is manufactured. Take out the la. Thereafter, the core rod 44 is pulled out of the cast rotor. By repeating the above operations, cast rotors are sequentially manufactured.

In the above-mentioned embodiment, the semi-finished product 40 has a thickness of 30 mm and a height of 30 mm in the laminated state of the thin plates 43, and the small holes 42.42 are formed by piercing 12 pieces having a diameter of 2.4 mm. Heat the temperature of the lower mold 10 to 200 to 400 ° C,
The pressure punch 30 was operated at a pressing force of 250 tons to produce a cast rotor. As a result, the semi-molten billet R spreads sufficiently in the upper and lower spaces and forms an end ring, and this end ring is connected with the material filled in the small holes 42.42, so that air is not entrained. A solid, high quality cast rotor was produced with the production.

[0009]

As is apparent from the above description, the present invention forcibly presses a semi-molten billet into a space by pressing a semi-molten billet through a press punch on a semi-finished product inserted into a lower mold.
Since the caster is manufactured, it is possible to obtain a high-quality cast roller without air entrainment and withdrawal.

[Brief description of the drawings]

FIG. 1 is a sectional view of a mold facility used in the present invention.

FIG. 2 is a sectional view of a semi-finished product used in the present invention.

FIG. 3 is a cross-sectional view showing an embodiment of the present invention and showing a state before a pressing operation.

FIG. 4 is a cross-sectional view showing a pressing operation state as an example of the present invention.

[Explanation of symbols]

 10 Lower mold 11 Concave cavity 12 Lower narrow step 20 Upper mold 30 Pressing punch 40 Semi-finished product 41 Core rod hole 42 Small hole 43 Thin plate 44 Core rod R Semi-molten billet S Closed space

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 19/00 B22D 17/00 B22D 18/02 B22D 27/11

Claims (1)

(57) [Claims] 1. A lower mold 10 having a concave cavity 11 whose bottom is formed into a lower tapered step 12;
1 has a cylindrical upper mold 20 having an intermediate portion 21 having a diameter slightly shorter than the inner diameter of the upper mold 20 and a pressurization having an outer shape capable of being inserted into the hollow portion 21 of the upper mold 20. While preparing the punch 30, a plurality of thin plates 43 in which a core rod hole 41 is formed in the center and a large number of small holes 42 which penetrate vertically at an intermediate position are formed at an appropriate interval, are inserted into a core rod 44.
A semi-finished product 40 is prepared in which the core rod hole 41 is inserted and the small hole 42 is communicated with the lower die 10.
The semi-finished product 40 is inserted into the concave cavity 11 of FIG.
After the lower surface is placed on the lower narrow step 12, the upper die 20 is placed on the upper part of the lower die 10 and the semi-molten billet R is put into the upper die 20, and the pressure punch 30 is removed. Upper mold 20
Through the small holes 42 through which the semi-molten billet R is communicated by press-fitting into the hollow portion 21 of the lower cavity 1 of the concave cavity.
(2) A method for manufacturing a cast rotor, comprising: solidifying a hollow portion defined by the lower surface of the pressure punch 30, the upper surface of the thin plate 43, and the upper die 20.