JP3806809B2 - Casting apparatus and casting method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a casting apparatus and a casting method, and more particularly, to a strainer installation structure and a method of using the same when supplying molten metal.
[0002]
[Prior art]
Conventionally, a strainer in a casting apparatus is interposed between a molten metal supply pipe and a pouring gate in a mold, and is used to filter the molten metal supplied from the molten metal supply pipe to the mold.
[0003]
[Problems to be solved by the invention]
However, since the strainer is merely placed on the front end surface of the molten metal supply pipe, the mold is slidably opened and closed due to its function, and the molten metal supply pipe slides the shaft center of the mold. When it is arranged perpendicular to the moving surface, the strainer becomes an obstacle when the mold slides, and as a result, there is a disadvantage that the mold is difficult to open and close properly.
[0004]
An object of the present invention is to eliminate such inconvenience.
[0005]
[Means for Solving the Problems]
In order to achieve such a subject, the inventors have intensively researched and completed the present invention. In the casting apparatus according to the present invention, the mold is slidably arranged with respect to the molten metal supply pipe, and the axis of the molten metal supply port of the mold is made perpendicular to the sliding surface of the mold so that the molten metal supply pipe is In the casting apparatus in which the opening is provided with a recess and the strainer is housed in the recess, the inner diameter of the molten metal supply port is reduced over the entire circumference from the outer diameter of the strainer. The strainer is not hindered and is held by the inner end edge of the molten metal supply port even when a molten metal pressure is applied, and no gap is generated around the strainer.
[0006]
In the casting method according to the present invention, the mold is disposed so as to be slidable with respect to the molten metal supply pipe, the axis of the molten metal supply port of the mold is perpendicular to the sliding surface of the mold, and the molten metal supply is performed. A recess is provided in the opening of the pipe, the inner diameter of the molten metal supply port is reduced over the entire circumference of the strainer, and hot water is supplied to the mold from the molten metal supply pipe via the strainer. Even so, the strainer is hooked on the inner edge of the molten metal supply port, so that no gap is generated around the strainer, and foreign matter can be prevented from being mixed.
[0007]
【Example】
FIG. 1 is a sectional view of a low-pressure casting apparatus for a vehicle wheel according to the present invention.
[0009]
In FIG. 1, reference numeral 10 denotes a base of the casting apparatus D. The base 10 supports a mold set S for molding a vehicle wheel. This mold set S is a combination of a lower mold 20, a pair of horizontal molds 30, 30 and an upper mold 40. The horizontal molds 30 and 30 referred to in the present application refer to molds that move along the plane where the axes of the molten metal replenishing means (which corresponds to a molten metal replenishing pipe 70 described later) intersect. Reference numeral 50 denotes a cavity, which is formed by the mold set S. The cavity 50 has a vehicle wheel shape, and includes a disk forming portion 51, a spoke forming portion 52, and a rim forming portion 53. Reference numeral 21 denotes a lower mold 20 insert for molding the surface of the disk portion (of the vehicle wheel).
[0010]
31 and 31 are flow path changing runners, which are formed in the horizontal mold 30. The runners 31 and 31 are substantially L-shaped, and side end openings 311 and 311 are opened in the rim forming portion 53 of the cavity 50 to form a weir.
[0011]
Reference numeral 60 denotes a molten metal holding furnace, which is disposed below the base 10. In the molten metal holding furnace 60, molten metal M is accommodated. 70 and 70 are replenishment pipes, which are installed on the base 10 in a substantially vertical state. The supply pipes 70 and 70 are connected to lower end openings 312 and 312 of the flow path changing runners 31 and 31 through a sprue collar 71 which will be described later, and the lower ends are opened in the molten metal holding furnace 60. The lower end openings 312 and 312 of the flow path changing runners 31 and 31 correspond to the “molten metal replenishing port” in the present invention.
[0012]
In FIG. 2, 71 and 71 are gate collars and are placed on the upper end edges of the supply pipes 70 and 70. The sprue collar 71 and the replenishment pipe 70 constitute a “molten replenishment pipe” of the present invention.
[0013]
Reference numerals 72 and 72 denote concave portions, which are formed in the upper end openings of the gate collars 71 and 71, respectively. The recesses 72, 72 extend to the outside of the upper end opening of the gate collar 71, 71 and the lower end opening of the flow path changing runner 31.
[0014]
R is a strainer and is housed in a state of being placed in the recesses 72 and 72. That is, a larger recess than the strainer R is provided. For this reason, the strainer R does not collide even if the horizontal molds 30, 30 slide in the horizontal direction (perpendicular to the drawing), and does not fall into the supply pipe 70. Even if the molten metal pressure is applied, the edge of the lower end opening of the flow path changing runner 31, that is, the horizontal mold 30 (see the state of the phantom line), there is a gap around the strainer R. Therefore, it is possible to prevent foreign matters from being mixed and to use a flexible strainer, for example, a glass fiber strainer. In this way, if a non-metal strainer is used, the return material need not be time-sorted, so that the return material processing efficiency can be improved.
[0015]
For this reason, the molten metal M that has risen in the supply pipes 70 and 70 passes through the strainer R, and is then supplied to the rim forming portion 53 of the cavity 50 through the flow path changing runners 31 and 31 of the horizontal molds 30 and 30.
[0016]
The mesh holding portion of the strainer R is 25 to 40% with respect to the mesh diameter. The limitation is that when the amount exceeds 40%, the strainer material is wasted, and when the amount is less than 25%, the strainer R cannot be sufficiently suppressed against the molten metal pressure.
[0017]
In the first place, in the two-divided type (upper and lower), if the runner is provided in the upper mold, the mold cannot be removed, so it can be provided only on the lower mold surface. Then, the strength of the dam portion is low, and a problem appears remarkably in the case of the wheel, and the dam is provided on the disk and the outer flange, which is not preferable as a cast product. This means that when weirs are provided in areas that do not require much strength, there is more room for selection, and more weirs can be provided, which can improve production efficiency and provide more weirs. Since the hot water distance is short, it is possible to increase the productivity because the hot water can be used even if the mold temperature is low.
[0018]
Furthermore, if a pouring gate is provided in a horizontal shape, the pouring gate diameter can be freely set without being restricted by the product, and for example, it can be freely increased. When the gate is provided in the lower mold as in the past, the diameter of the gate affects the shape of the product, so the gate diameter is naturally limited, and as a result, it is difficult to improve the work efficiency of the casting operation. Met.
[0019]
【The invention's effect】
In the casting apparatus according to the present invention, the mold is slidably arranged with respect to the molten metal supply pipe, and the axis of the molten metal supply port of the mold is perpendicular to the sliding surface of the mold, In the casting apparatus in which the opening is provided with a recess and the strainer is accommodated in the recess, the inner diameter of the molten metal supply port is reduced over the entire circumference rather than the outer diameter of the strainer. The strainer is not hindered and is held by the inner end edge of the molten metal supply port even when a molten metal pressure is applied, and no gap is generated around the strainer.
[0020]
Therefore, if this casting apparatus is used, the strainer connected to the molten metal supply port is connected to the molten metal supply port even though the axis of the molten metal supply port of the mold is arranged perpendicular to the sliding surface of the mold. Since sliding is not hindered, proper sliding of the mold can be ensured. As a result, the runner is provided on the vertical parting, so that three-way parting is possible, and the runner can be provided for horizontal movement.
[0021]
Further, even when molten metal pressure is applied during hot water supply, the strainer is hooked on the inner end edge of the molten metal supply port, and no gap is generated around the strainer, so that foreign matter can be prevented from being mixed.
[0022]
In the casting method according to the present invention, the mold is disposed so as to be slidable with respect to the molten metal supply pipe, the axis of the molten metal supply port of the mold is perpendicular to the sliding surface of the mold, and the molten metal supply is performed. Since a recess is provided in the opening of the pipe, the inner diameter of the molten metal supply port is reduced over the entire circumference from the outer diameter of the strainer, and hot water is supplied to the mold from the molten metal supply pipe through the strainer. Even when the molten metal pressure is applied, the strainer is hooked on the inner edge of the molten metal supply port, so that no gap is generated around it, and foreign matter can be prevented from being mixed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a casting apparatus according to the present invention.
FIG. 2 is an enlarged view of a portion II in FIG.
[Explanation of symbols]
30… Horizontal type (mold)
312… Melt supply port (lower end opening of flow path changing runway)
72 ... Concavity D ... Low-pressure casting device for vehicle wheel (molding device)
R… Strainer

Claims (2)

Mold was vertically the axis of the melt feeding port of the mold with respect to the sliding surface of the mold with slidably arranged with respect to the melt supply tube, with Keru set a recess at the opening of the molten metal supply tube In the casting apparatus in which the strainer is housed in the recess, the inner diameter of the molten metal supply port is reduced over the entire circumference from the outer diameter of the strainer . The mold is slidably arranged with respect to the molten metal supply pipe, and the axis of the molten metal supply port of the mold is perpendicular to the sliding surface of the mold, and a recess is provided in the opening of the molten metal supply pipe. A casting method, wherein the inner diameter of the molten metal supply port is reduced over the entire circumference of the outer diameter of the strainer, and hot water is supplied to the mold from the molten metal supply pipe through the strainer.

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