JPS632196Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to improvements in molds.

Conventionally, sand molds are formed so that the upper end surface of the flask and the sand surface connected to the upper end surface of the flask are at the same height, so after filling the flask with casting sand and letting it harden,
A sand scraping process is required to remove excess casting sand that protrudes from the upper end of the mold flask on the sand input side, and the scattered sand generated during the sand scraping process adheres to the cavity surface of the mold and gets caught up in the molten metal. There is a disadvantage that when removing hardened casting sand, the mold surface collapses due to the pressure of sand cutting.

Also, when molding using a tall model,
A casting flask with a deep depth corresponding to the height of the model is required, but it is not easy to change the size of the flask to match the casting on the molding line, causing confusion on the molding line and reducing safety. This has the disadvantage of reducing productivity.

The purpose of this invention is to provide a mold free of the above-mentioned drawbacks, and will be explained below based on the drawings.

In Fig. 1, 1 and 1 are flasks for mold making, 1a and 1a are the upper end surfaces of the flasks, 1b and 1b are the lower end surfaces of the flasks, and 2 is the flask filled into the flask 1 to form the mold. 2a is a sand surface which protrudes from the upper end surface 1a of the flask and is hardened; 2b is a sand surface on the cutting surface side; and 3 is a cavity.

When a mold having such a configuration is poured after matching the molds as shown in Fig. 2, the sand surface 2a protruding from the upper end surfaces 1a of the flask is sufficiently firm, so that the sand cutting pressure is reduced. This prevents the casting sand 2 from being deformed and the casting sand 2 coming into contact with the molten metal from collapsing, and the cavity 3 is filled with the molten metal without involving the scattered sand generated by the sanding process, and the casting is finished. to be cast.

The mold of this invention is constructed so that the sand surface protrudes from the upper end surface of the flask, so there is no need to change the flask depending on the size of the casting, and it is not necessary to replace flasks of the same size in series. So you can use
Transporting the flask becomes easier, improving safety and productivity.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a mold of this invention, and FIG. 2 is a longitudinal sectional view showing a state in which the molds of this invention are fitted together. 1... Casting flask, 1a... Upper end surface of the casting flask, 2... Casting sand, 2a... Casting sand surface.

Claims (1)

[Scope of utility model registration request] A mold for making a mold by filling a flask with sand, characterized in that a sand surface 2a protrudes from upper end surfaces 1a, 1a of the flask.