JPH035044A - Casting flask structure - Google Patents

Abstract

PURPOSE:To make the molding sand high density condition by arranging an air cham ber at outer wall of a raising flask and also engaging the lower end part of the raising flask with upper end part of a casting flask with recessed and projecting parts. CONSTITUTION:The rectangular casting flask 2 and raising flask 3 are laid on a pattern base plate 1 and the lower end part of the raising flask 3 and the upper end part of the casting flask 2 are formed so as to engage with the recessed and projecting parts. Further, the rectangular air chamber 4 once storing compressed air blown into the casting flask 2 and the raising flask 3 is arranged at the outer wall of the raising flask 3 and a first and secong air exhaust holes 5, 6 for exhausting the compressed air to the outer part are bored to the raising flask 3 and the air chamber 4. After tightly matching the raising flask 3 with the casting flask 2, at the time of blowing the molding sand together with the compressed air into the casting flask 2 and the raising flask 3, the compressed air is quickly caused to flow into the air chamber 4 from the first gas exhaust hole, and after once stored in the air chamber 4, this is exhausted into the outer air from the second air exhaust hole 6. On the other hand, the molding sand is packed into the casting flask 2 and the raising flask 3 under high density condition and after that, by removing the raising flask 3, the good mold can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a joint frame placed on a casting flask.

(Prior Art) As a conventional molding device, there is one shown in Japanese Patent Application Laid-Open No. 63-93447, in which a casting flask and a joint frame are placed on a model surface plate, and the molding machine and the casting flask are placed on a model surface plate. An appropriate number of exhaust holes are provided in the model surface plate between the two.

(Problems to be Solved by the Invention) During mold making, a large amount of compressed air is blown into the joint flask and casting flask together with molding sand, and then the compressed air is discharged into the atmosphere from the exhaust hole. There is a problem in that the compressed air is not sufficiently vented and remains in the molding sand, making it difficult to fill the molding sand in a high density state. Therefore,
The present invention has been made to solve these problems and provides a flask structure that can be filled with molding sand in a high density state.

(Means for Solving the Problems) The present invention provides a flask structure in which an air chamber is provided in the outer wall of the joint frame, and the lower end of the joint frame engages with the lower end of the flask in an uneven manner.

(Function) The joint frame is closely fitted to the casting flask by the uneven engagement between the lower end of the joint frame and the lower end of the casting flask. After that, when compressed air is blown into the joint flask and casting flask together with molding sand, the compressed air is discharged into the atmosphere through the air chamber, and the molding sand is filled in the joint flask and casting flask in a high-density state. .

(Example) Figures 1 to 6 show a flask structure according to the present invention, in which a rectangular molding flask 2 and a joint frame 3 are placed on a model surface plate 1, and the lower end of the joint frame 3 and the molding frame 3 are placed on a model surface plate 1. The upper end of the flask 2 is formed to engage with the upper end of the flask 2 in a concave and convex manner, and a sealing member (not shown) is attached to the upper end of the flask 2.

A rectangular air chamber 4 is provided on the outer wall of the joint frame 3 to temporarily accommodate the compressed air blown into the casting flask 2 and the joint frame 3. First and second exhaust holes 5.6 are provided for exhaust. The height of the air chamber 4 is determined as appropriate depending on the height of the flask, the model, the molding sand, the cavity, and the like. Reference numeral 7 denotes a through hole for a pin member (not shown) that is inserted through the flasks 2.3 when the flasks 2 and 3 are fitted together.

When the casting flask 2 and joint frame 3 are placed on the model surface plate 1, the joint frame 3 is tightly fitted to the casting flask 2 due to the uneven engagement between the lower end of the joint frame 3 and the upper end of the casting flask 2. Ru. After that, when molding sand (not shown) is blown into the flask 2 and joint frame 3 together with compressed air, the compressed air quickly flows out through the first exhaust hole 5 into the air chamber 4, and the figure shows the joint frame. The plan view of Figure 3 is m of Figure 2.
-m sectional view, Figure 4 is the IV-IV sectional view of Figure 2, and Figure 5 is the IV-IV sectional view of Figure 2.
The figures are a sectional view taken along the line ■--■ of FIG. 2, FIG. 6 is a front view of a mold formed by the flask structure of the present invention, FIG. The figure is a front view of a mold formed using the flask structure shown in FIG. 7.

2... Casting flask, 3... Joint frame, 4... Air chamber.

Claims (1)

[Claims] A flask structure consisting of a flask and a joint flask, characterized in that an air chamber is provided in the outer wall of the joint flask, and the lower end of the joint flask engages with the upper end of the flask in an uneven manner.