JP3113925B2 - Core type for disk rotor molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a core for a disk rotor.

[0002]

2. Description of the Related Art A core mold for disk rotor molding is formed from a horizontal split mold, and an inner peripheral skirting cavity, an outer peripheral skirting cavity, and both core cavities are provided in the core mold. An annular cavity comprising the provided core cavity is provided, and an appropriate number of blow holes are formed in the upper mold to communicate with the inner peripheral skirting cavity and the outer peripheral skirting cavity, respectively. The respective portions of the core cavity and the outer peripheral skirting cavity are formed so as to be symmetrical with each other (for example, Japanese Utility Model Application Laid-Open No. 57-11634).
No. 8, Publication No. 1-2.

[0003]

In the conventional core mold, a suitable number of blow openings are provided in the inner and outer peripheral portions of the upper mold, and thermosetting sand or air blown into the core mold together with air. Although uniform filling and high-density filling of self-hardening sand are attempted, the press-contact area of the blow plate that presses against the upper mold increases, so when using thermosetting sand, the thermosetting sand in the blow head is used. However, there is a problem that when the self-hardening sand is used, the sand hardening gas easily leaks. Therefore, the present invention has been made in order to solve such a problem, and a core for a disk rotor molding capable of homogeneously filling and high-density filling of thermosetting sand or self-hardening sand even with a single blowing port. To provide.

[0004]

According to the present invention, there is provided a core mold for disk rotor molding according to the present invention, in which an upper mold is provided with a blow-out port having an undercut portion, and a lower mold is provided with a blow port having an undercut portion. A semi-oval convex portion is provided, and the respective vertical axes of the blowing port and the semi-oval convex portion are disposed concentrically with the axial center of the annular cavity. It is characterized by being unevenly distributed on the mold side.

[0005]

The core sand blown with air into the annular cavity from the blow-off port is uniformly dispersed when it comes into contact with the lower half-oval convex portion, and the core sand and the half-oval shape protrude. Moves from the inner peripheral side to the outer peripheral side of the annular cavity together with the air through the gap with the convex portion, and the core sand is uniformly and densely filled.

[0006]

FIG. 1 shows an embodiment of the present invention, in which a core for disk rotor molding is formed of a horizontal split die, and an inner peripheral skirting cavity 2a and an outer peripheral width are formed in the die. An annular cavity 2 comprising a wood cavity 2b and a core cavity 2c provided between the two skirting cavities 2a, 2b is provided, and an inner peripheral skirting cavity 2a, a core cavity 2c, and an outer peripheral skirting are provided. The cavities 2b are formed so as to communicate with each other. The upper mold 1a is provided with a blowing port 3 protruding toward the annular cavity 2 and having an undercut portion 3a, and the lower mold 1b is provided with a semi-oval convex 4 protruding toward the annular cavity 2 side. An orifice is formed by the protruding outlet 3 having the undercut portion 3a and the protruding portion 3 of the lower mold 1b, and each vertical axis of the blowing port 3 and the protruding portion 4 is The annular cavity 2 is provided concentrically with the axis, and the annular cavity 2 is engraved so as to be unevenly distributed on the lower mold 1b side, so that a core (not shown) is left in the lower mold 1b when releasing the mold. Further, a vent hole (not shown) for discharging air is provided at a predetermined portion of the lower mold 1b.

When core sand (not shown) made of thermosetting sand or self-hardening sand is blown into the annular cavity 2 from the blowing port 3 together with air, the core sand becomes a half-oval convex of the lower mold 1b. After being in contact with the portion 4, it is uniformly dispersed and moves from the inner peripheral side to the outer peripheral side of the annular cavity 2 together with air through the gap between the protruding outlet 3 and the convex portion 4 of the lower mold 1 b. The child sand is uniformly and densely filled in the annular cavity 2, and air is supplied to the lower mold 1.
B is discharged from a vent hole (not shown). The core sand (not shown) in the molds 1a and 1b is cured by heat or chemical reaction by known gassing. Mold 1a, 1b
Is opened, the hardened core (not shown) remaining in the lower mold 1b is taken out, and the next molding cycle is performed.

[0008]

According to the present invention, since the orifice is formed by the protruding outlet having the undercut portion and the half-oval convex portion of the lower mold, the blowing air rapidly enters the annular cavity. Good filling with core sand. Since the pressure contact area between the blow plate and the core mold is small, the heat conduction is low and the thermosetting core sand in the blow head does not harden without water cooling the blow plate. Also, gas leakage hardly occurs when the core sand curing gas is blown. Further, since the annular notch is engraved on the core by the projecting portion having the undercut portion of the blowing port, the core is less likely to be eaten when the blowing portion of the core is separated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a core for disk rotor molding according to the present invention.

[Explanation of symbols]

 1a Upper Die 1b Lower Die 2 Annular Cavity 3 Inlet 3a Undercut 4 Convex

Claims (2)

(57) [Claims] 1. A horizontally split disk rotor molding core having an annular cavity consisting of an inner peripheral skirting cavity, an outer peripheral skirting cavity, and a core cavity provided between the skirting cavities. The upper mold is provided with a blow-out port protruding toward the annular cavity and having an undercut portion, and the lower mold is provided with a half-oval protrusion protruding toward the annular cavity, the blow-opening port and the half-oval shape are provided. A core for a disk rotor molding, wherein each axis of the projection in the vertical direction is arranged concentrically with the axis of the annular cavity. 2. A horizontally split disk rotor molding core having an annular cavity comprising an inner peripheral skirting cavity, an outer peripheral skirting cavity, and a core cavity provided between the two skirting cavities. The upper mold is provided with a blow-out port protruding toward the annular cavity and having an undercut portion, and the lower mold is provided with a half-oval protrusion protruding toward the annular cavity, the blow-in port and the half-oval A core mold for disk rotor molding, wherein each vertical axis of the convex portion is disposed concentrically with the axis of the annular cavity, and the annular cavity is biased toward the lower mold.