JP2006218530A - Molten metal-feeding hopper in gravity casting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molten metal-feeding hopper in a gravity casting apparatus where the quantity of the molten metal poured into a casting frame when casting is set to the optimum state, and the defect in a product can be effectively prevented safely and without wasting a raw material. <P>SOLUTION: The side part of a feeding hopper 4 is integrally provided with a reserve tank 6 capable of reserving a fixed volume of molten metal W. In the case the quantity of the molten metal to be tapped from a molten metal feeding furnace 1 is large, and the molten metal W in a set quantity or larger than that is tapped inside the feeding hopper 4, the surplus molten metal W is reserved in the reserve tank 6, and, when the molten metal W is made to flow into a casting frame 3, its overflowing and the waste of the material are prevented, and further, the defect in a product from the losing of the balance in the solidifying velocity caused by the increase of a feeding part can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a molten metal supply hopper of a gravity casting apparatus, and more particularly to a molten metal supply hopper of a gravity casting apparatus capable of setting the amount of molten metal poured into a casting frame at the time of casting to an optimum state.

  Conventionally, as a gravity casting apparatus implemented by a gravity casting method, for example, as shown in FIGS. 8A to 8C, a supply attached from a hot water furnace 1 to a casting frame 3 via a hot water tray 2. A predetermined weight of molten metal W is supplied to the hopper 4, the casting frame 3 is turned 90 degrees together with the supply hopper 4 via a turning device (not shown), and the molten metal W in the supply hopper 4 is poured into the gypsum mold 5 in the casting frame 3. (For example, Patent Document 1).

  However, in the conventional gravity casting method, when the molten metal W is discharged from the hot water furnace 1, the operator M starts the hot water by tilting the hot water furnace 1, and the operator M sets the molten metal W in the supply hopper 4. The amount of hot water discharged from the hot water furnace 1 was adjusted by checking the amount of accumulation h.

  However, the amount of hot water discharged from the hot water furnace 1 varies depending on conditions such as the tilt angle of the hot water furnace 1, the tilting speed of the hot water furnace, the angle of the hot water tray 2, and the amount of hot water visually detected by the operator M. Therefore, there is a problem that it is difficult to perform accurate detection.

For example, when the molten metal W in the supply hopper 4 is small, as shown in FIGS. 9A and 9B, the molten metal W in the casting frame 3 is small, and so-called cast sink (insufficient molten metal) occurs. , There is a problem of causing a product defect, and conversely, if there is too much molten metal W in the supply hopper 4, the molten metal W overflows and becomes dangerous as shown in FIGS. 10 (a) and 10 (b). There is a problem that the product becomes defective due to wasting and accuracy failure (imbalance of solidification rate due to increased feeder area) occurs.
JP-A-62-114761

  The present invention pays attention to such conventional problems, and sets the optimum amount of molten metal to be poured into the casting frame at the time of casting, so that the gravity is safe, there is no waste of materials, and product defects can be effectively prevented. It aims at providing the molten metal supply hopper of a casting apparatus.

  In order to achieve the above object, the gist of the present invention is that a reserve tank is provided at a side portion of the supply hopper.

  Here, it is also possible to provide a partition wall for adjusting the supply amount of the molten metal at the boundary between the reserve tank and the supply hopper, and to provide a backflow prevention weir at the upper end of the supply hopper. In addition, the partition wall can be configured to be movable in the vertical direction, and the partition wall can be configured to be separable. It is also possible to use a melt solidification promoting member in the reserve tank. As described above, the optimum molten metal is always supplied into the casting frame to prevent the material from being wasted and to improve the product accuracy.

  The present invention provides a reserve tank on the side of the supply hopper as described above, so that the amount of molten metal poured into the casting frame during casting is set to an optimum state, which is safe and eliminates waste of materials, resulting in defective products. It is possible to effectively prevent the product and improve the product accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

  FIGS. 1 and 2 are explanatory views showing a first embodiment of the present invention, wherein 3 is a casting frame, 4 is a supply hopper, and a fixed volume of molten metal W is stored in the side of the supply hopper 4. A reserve tank 6 is provided integrally.

  This reserve tank 6 stores the excess molten metal W in the reserve tank 6 when a large amount of molten metal W is discharged from the hot water furnace 1 and more than a set amount of molten metal W is supplied into the supply hopper 4. When the molten metal W is poured into the frame 3, it prevents overflowing and waste of materials, and further prevents product defects from the loss of the solidification rate balance caused by the increase of the hot water feeder.

  3 and 4 are explanatory views showing a second embodiment of the present invention. In this embodiment, the boundary weir 7 at the boundary between the reserve tank 6 and the supply hopper 4 has an upper end portion. In addition, a backflow prevention weir 7a for preventing the backflow of the molten metal W is provided when the supply hopper 4 is tilted, and this backflow prevention weir 7a is configured to be movable around the fulcrum 8.

  That is, the backflow prevention weir 7a can be moved around the fulcrum 8 so that the molten metal Wa can be taken out from the reserve tank 6 after the molten metal Wa accumulated in the reserve tank 6 has solidified.

  5 and 6 are explanatory views showing a third embodiment of the present invention. In this embodiment, a solidification promoting member 6x of a molten metal W such as a mold is used for the reserve tank 6. FIG. Thus, unlike the second embodiment, the backflow prevention weir 7a is not provided in the boundary weir 7 in the boundary portion, so that the molten metal W does not overflow from the reserve tank 6 when tilting.

  7A to 7C show a fourth embodiment of the present invention. In this embodiment, the supply hopper 4 and the reserve tank 6 are formed separately, and the reserve tank 6 is supplied to the supply hopper. 4 is configured to be movable in the vertical direction, or only the partition wall 6a adjacent to the supply hopper 4 is configured to be movable in the vertical direction, and further, the partition wall 6a is configured to be separable. .

  By setting the reserve tank 6 up and down and the partition wall 6 a up and down in this way, the set molten metal amount W in the supply hopper 4 can be arbitrarily set to “low”, “medium”, and “high”. Yes, it is possible to arbitrarily control the set amount of molten metal.

  As described above, by providing the reserve tank 6 at the side of the supply hopper 4, the amount of molten metal poured into the casting frame 3 at the time of casting is set to an optimum state, and it is safe and eliminates waste of material, resulting in a defective product. Can be effectively prevented to improve product accuracy.

It is explanatory drawing which shows 1st Embodiment of this invention. It is explanatory drawing at the time of the hot water supply of 1st Embodiment of this invention. It is explanatory drawing which shows 2nd Embodiment of this invention. It is explanatory drawing at the time of the hot water supply of 2nd Embodiment of this invention. It is explanatory drawing which shows 3rd Embodiment of this invention. It is explanatory drawing at the time of the hot water supply of 3rd Embodiment of this invention. (A)-(c) is explanatory drawing at the time of the hot water supply of 4th Embodiment of this invention. (A)-(c) is explanatory drawing at the time of the hot water supply in the conventional gravity casting method. (A), (b) is explanatory drawing in case there are few conventional molten metals. (A), (b) is explanatory drawing in case there are many conventional molten metals.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot-water supply furnace 2 Hot-water supply tray 3 Casting frame 4 Supply hopper 5 Gypsum type W Molten metal 6 Reserve tank 6x Solidification promoting member 7 Boundary weir 7a Backflow prevention weir 8 Support point Wa Molten metal

Claims (6)

A molten metal of a predetermined weight is supplied from a hot water furnace to a supply hopper attached to the casting frame via a hot water tray, and the casting frame is turned 90 degrees together with the supply hopper to cast the molten metal in the supply hopper into the casting frame. In the molten metal supply hopper of the gravity casting machine
A molten metal supply hopper of a gravity casting apparatus, wherein a reserve tank is provided on a side portion of the supply hopper. The molten metal supply hopper of the gravity casting apparatus of Claim 1 which provided the partition wall which adjusts the supply amount of a molten metal in the boundary part of the said reserve tank and a supply hopper. The molten metal supply hopper of the gravity casting apparatus of Claim 1 or 2 which provided the backflow prevention weir in the upper end part of the said supply hopper. The molten metal supply hopper of the gravity casting apparatus of Claim 2 or 3 comprised so that the said partition wall could move to an up-down direction. The molten metal supply hopper of the gravity casting apparatus according to claim 2, 3 or 4, wherein the partition wall is configured to be separable. The molten metal supply hopper of a gravity casting apparatus according to claim 1, 2, 4, or 5, wherein a molten metal solidification promoting member is used in the reserve tank.

Images