JPH055260U - Lower mold equipment for low pressure casting machine - Google Patents

Abstract

(57) [Summary] [Purpose] The sprue nozzle is not made of ceramic, which is a material that slows the solidification of the molten metal due to no adherence of oxides. Do not use a mounting structure. [Structure] A ceramic spout nozzle 5 is fitted into the spout part of a lower die for a low pressure casting machine, and the spout tube 9 is elastically supported by packings 6 and 8 for the lower die 1 and the stalk pipe 9. A lower mold device for a low-pressure casting machine, which is configured to contact and crimp the flange portion 10.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a lower die device used in a low-pressure casting machine, and more particularly to a connection structure with a stalk pipe that communicates with a sprue part of the lower die.

[0002]

[Prior art and problems]

 Generally, the sprue part formed in the lower die of a low-pressure casting machine is severely damaged by a large thermal shock. Therefore, a sprue nozzle made of metal is fitted into this part and replaced every time it is damaged. However, metal spout nozzles tend to adhere to oxides and often require manual removal and cleaning, which is a major obstacle to automation of low-pressure casting. Moreover, since the metal gate nozzle is made of almost the same material as the lower die, the gate part also solidifies almost simultaneously (with some delay) with the solidification of the product part, and the molten metal in the stoke pipe descends. Even if it was done, the product part was cast with an extra sprue part that had to be cut and removed, and the yield was poor.

The present invention has been made in view of the above problems, and the gate nozzle is made of ceramic so that almost no deposits are attached, and its heat insulating property is used to solidify the melt at the gate. It is an object of the present invention to provide a lower mold device that is further delayed than a metal gate and is free from cracks caused by fixed attachment of a ceramic gate nozzle.

[0004]

[Means for solving problems]

 In order to achieve the above object, the lower die device for a low-pressure casting machine according to the present invention has an annular recess that extends from the lower end to the upper position on the peripheral surface of the sprue of the lower die, and the inner surface of the annular recess is A ceramic sprue nozzle, which is ground on the mirror surface and formed with an annular groove on the lower edge of the outer surface, is inserted from below. The holding plate and the lower mold are connected and fixed from below with screws, and the upper flange of the stote tube is abutted and crimped with a packing interposed between the holding plate and the lower surface of the ceramic spout nozzle. Is.

[0005]

[Action]

 In the present invention, by adopting the above-mentioned solution means, molten oxide is prevented from adhering, and the solidification of the molten metal at the sprue part is delayed, so that excess solidification is eliminated. Moreover, it is possible to eliminate damage to the ceramic gate nozzle.

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a main part of a lower mold device in a low-pressure casting machine. An annular recess 3 reaching from a lower end to an upper position is formed on a peripheral surface of a spout part 2 of the lower mold 1. A ceramic sprue nozzle 5 having an inner surface polished to a mirror surface and an annular recessed groove 4 formed at the lower edge of the outer surface is fitted into the annular recess 3 from below. Further, a split pressing plate 7 is inserted into the annular recessed groove 4 with a packing 6 interposed in the upper part thereof, and the pressing plate 7 and the lower mold 1 are connected and fixed by screwing from below. ..

An upper flange portion 10 of a stalk pipe 9 is abutted and pressure-bonded to the lower surfaces of the pressing plate 7 and the ceramic gate nozzle 5 with a packing 8 interposed. That is, the ceramic gate nozzle 5 is elastically supported by the packings 6 and 8 on the upper and lower end surfaces of the recessed groove 4, and is constructed so as not to be damaged by pressure bonding from the vertical direction. Has been done.

Since the spout nozzle 5 is made of ceramic in such a structure, there is almost no oxidative adhesion of the melt, and the solidification of the melt at the spout is slower than the solidification of the product part, resulting in excessive solidification. Since the yield is improved and the attachment of the ceramic spout nozzle 5 is elastically supported and crimped through the packings 6 and 8, there is no damage such as cracks due to the fixed attachment of the ceramic spout nozzle 5.

[0009]

[Effect of the device]

 As is apparent from the above description, the present invention fits a ceramic spout nozzle to the spout part of the lower die for a low-pressure casting machine, and the spout nozzle is elastically supported by packing and is screwed to the lower die. Since it is fixed by means of the above structure, it is possible to eliminate all of the various drawbacks of conventional metal sprue nozzles, and to press the pressing force of the lower mold and stalk pipe to the ceramic plate to damage the ceramic sprue nozzle. There are various effects such as no.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the present invention.

[Explanation of symbols]

 1 Lower mold 2 Gate part 5 Ceramic gate nozzle 6 8 Packing 7 Holding plate 9 Stoke tube 10 Flange part

Claims (1)

[Claims for utility model registration] 1. An annular recess 3 is formed on the peripheral surface of the sprue 2 of the lower die 1 from the lower end to the upper position, and the inner surface of the annular recess 3 is polished to a mirror surface. A ceramic spout nozzle 5 having an annular groove 4 formed at the lower edge of the outer surface is fitted from below, and a split pressing plate 7 is inserted into the annular groove 4 with a packing 6 interposed at the upper part thereof and the pressing plate is also inserted. 7 and lower mold 1
A low pressure casting machine characterized in that the flange portion 10 of the stalk pipe 9 is abutted and crimped by interposing packing 8 on the lower surface of the holding plate 7 and the bottom gate 5 of the ceramic gate 5 made of ceramics. Lower mold equipment