JPH057109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to a sand mold transfer casting method.

(Prior art) As a method for casting using sand molds, a large number of sand molds are continuously transferred on a conveyor rail,
There is a method in which molten metal is sequentially injected into cavities formed by adjacent sand molds, the molten metal waits for the molten metal to solidify, the sand molds are collapsed, and the solidified molten metal is cooled to produce a product.

According to the above method, the sand molds that advance side by side without any gaps on the conveyor rail press against each other,
By balancing this pressing force with the pressure of the molten metal generated within the cavity, it is possible to prevent the sand mold from collapsing and the adjacent sand molds from separating due to the pressure of the molten metal.

(Problem to be Solved by the Invention) However, in the above method, when the sand molds begin to be transferred, the first ten or so sand molds traveling on the conveyor rail are
It does not receive sufficient pressing force from the direction of travel.
Therefore, without injecting molten metal into the cavities of these ten or more sand molds, the internal and external pressures are balanced and the sand molds are prevented from collapsing. For this reason, the several sand molds described above are used only as a type of weight to apply pressure to the sand molds that follow, and are not used for pouring metal, which is the original purpose of the sand molds. Moreover, contrary to the above, the last few sand molds traveling on the conveyor rail at the end of the transfer of the sand molds do not receive sufficient pressing force from the supply direction. Therefore, these last few sand molds also cannot be filled with molten metal and are not used for pouring. In the above method, it is not possible to use the first and last dozen sand molds out of the continuous sand molds, and there is still room for improvement in terms of work efficiency and economy.

An object of the present invention is to provide a method and apparatus for transferring sand molds that can use all the sand molds that are continuously supplied and are excellent in working efficiency and economy.

Structure of the Invention (Means for Solving Problems) In order to achieve the above-mentioned object, the present invention arranges continuously supplied sand molds in a line on a predetermined conveyance path, and places this sand mold row on the cooling zone side. This is a sand mold transfer type casting method in which molten metal is injected into the cavity of a sand mold during the process of conveying the molten metal into the cavity of the sand mold. It is designed to prevent the sand mold from collapsing and separating by balancing the pressure.

(Function) By employing the above-mentioned means, the present invention applies a pressing force from the traveling direction to the leading end of the sand mold array traveling on a predetermined conveyance path.
Further, a pressing force from the supply side is applied to the terminal end portion, which balances with the pressure of the molten metal and prevents the sand mold from collapsing.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, sand molds 2 formed by a sand mold supply device 1 are continuously supplied onto a conveyance rail 3 as a conveyance path extending from the supply device 1, forming an orderly row of sand molds. Then, it advances to a sand mold receiving device (not shown) provided in the front (left side). During this progress, molten metal 5 is injected into the cavity formed by the two adjacent sand molds 2 from the sprue 4 having a circular planar shape, and this molten metal 5 gradually solidifies.

On the conveyance rail 3, a mounting box 6 is disposed opposite to the feeding device 1 at a position spaced apart from the front, and a cylinder rod 8 of an air cylinder 7 provided inside the mounting box 6 projects rearward from the mounting box 6. ing. A pressing plate 9 is fixed to the rear end of the cylinder rod 8, and when the cylinder rod 8 is projected, it comes into contact with the front side of the leading sand mold 2a moving forward on the conveyor rail 3.
Appropriate pressing force is applied.

In addition, after all the sand molds 2 are sent out in the work process of one day, the feeding device 1 is placed on the conveyor rail 3.
A plurality of blocks 10 are sent successively from the side. Each block 10 is formed to have the same size as the sand mold 2, and the front side of the first block 10 comes into contact with the rear side of the last sand mold 2b, and this sand mold 2b
Appropriate pressing force is applied from the rear.

The mounting box 6 will now be explained with reference to FIGS. 3 and 4. A pair of long plate-shaped holding members 11 are attached to the upper surface of the attachment box 6, and one end of these members protrudes from the attachment box 6 in one direction. A mounting portion 12 having a substantially semicircular shape is formed on the lower surface of the protruding portion of the holding member 11, and is positioned on a pedestal 14 formed by lowering the floor 13 at a position slightly apart from the rail 3 in one direction. The mounting portion 12 is connected to a pair of support brackets 15 via a rotating shaft 16. and,
When the other side of the mounting box 6 is lifted, the mounting box 6 rotates about its mounting portion 12 in the direction of the arrow in FIG. 3, and can be retracted from the rail 3 if necessary.

A pair of support protrusions 17 are disposed opposite to each other at the lower part of the other side of the mounting box 6, and when the mounting box 6 is on the rail 3, a pair of support protrusions 17 are provided on the floor 13 with a slight distance from the rail 3 toward the other side. The projections 18 are held in place to hold the mounting box 6 so that it does not wobble.

In the sand mold transfer device described above, among the sand molds 2 that are continuously supplied from the supply device 1 to the conveyor rail 3,
When the first one 2a that starts advancing reaches a predetermined position, the supply is temporarily stopped and the advance of the sand mold 2 is stopped. Then, the leading sand mold 2a receives the pressing force acting on the supply side from the pressing plate 9 as the cylinder rod 8 of the mounting box 6 protrudes. For this reason, a force that balances the pressure of the molten metal 5 in the cavity is applied to the leading sand mold 2a and the several sand molds 2 following it, and the sand molds 2a, 2 are kept in close contact with each other, so that they are not separated from each other. Moreover, the sand molds 2a, 2 will not collapse due to the pressure of the molten metal 5. After that, after waiting for the molten metal 5 to solidify, the cylinder rod 8 is moved to the recessed position, and the sand molds 2, 2a are
moves forward on the conveyor rail 3 and passes below the mounting box 6 held in the upwardly rotating position, then enters the cooling zone where the molten metal 5 is cooled and solidified and reaches the sand mold receiving device.

Similarly, when the last sand mold 2b that has finished advancing is sent out onto the conveyor rail 3, the block 10 following this sand mold 2b applies a pressing force from behind to the sand mold 2b and the several sand molds 2 preceding it. At the same time, it advances on the conveyor rail 3 together with the sand molds 2 and 2b. Therefore, the sand molds 2b, 2 will not separate or collapse due to the pressure of the molten metal 5 in the cavity.

When the sand molds 2, 2a, and 2b reach the receiving device, the molten metal 5 that has been crushed and solidified is taken out, and the molten metal 5 is cooled to obtain a product.

Effects of the Invention By adopting the above configuration, the present invention has the following features:
All of the sand molds that are continuously supplied can be used, which has the excellent effect of increasing work efficiency and economic efficiency.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the method of applying pressure to the supply start part of the sand mold, Fig. 2 is a plan view showing the method of applying pressure to the supply end part of the sand mold, and Figs. 3 and 4 are sectional views each showing the mounting box. and a plan view. Sand mold...2, conveyor rail as a passageway...3, molten metal...5.

Claims (1)

[Claims] 1. Sand mold transfer casting in which continuously supplied sand molds are arranged in a line on a predetermined conveyance path, and molten metal is injected into the cavity of the sand mold during the process of conveying the sand mold array to the cooling zone side. In the method, a pressure of a predetermined strength is applied to each of the leading end side and the terminal end side of the sand mold row, and the pressure is balanced with the pressure of the molten metal in the cavity to prevent the sand mold from collapsing and separating. A sand mold transfer casting method characterized by: