JPH0362499B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a mold making device, and more particularly, to a mold making device that can make mold hardness substantially uniform.

(Prior art) Conventionally, after a casting flask is placed on a lower surface plate having a model, molding sand is poured into the flask and a flat upper surface plate or an upper surface plate having a molding sand pressing piece protruding from the periphery is used. Molding is done by compacting the foundry sand using a surface plate (for example, see Utility Model Application Publication No. 134728/1983).

(Problems to be Solved by the Invention) In conventional mold making equipment, the molding sand does not have a uniform hardness, and the molding sand above the top of the model is hard and the molding sand near the flask is soft, so the conveyance process or time There are problems in that mold deformation occurs over time and firmness occurs due to casting pressure. The present invention has been made to solve these problems and provides a mold making device that can uniformize the hardness of the mold near the flask and make the entire molding sand a desired hardness.

(Means for Solving the Problems) The present invention provides a frame body for pressing the molding sand filled in the joint frame and the casting flask above the model surface plate on which the joint frame and the casting flask are placed. The mold making device rotatably supports a rotating body consisting of a circular rotating plate and a plurality of protruding pieces vertically disposed on the lower surface of the rotating plate at the bottom of the frame, and the protruding pieces support the rotating body. A curved plate that extends in a curved manner from the axis of the rotating plate toward the outer circumferential edge of the rotary plate and whose width gradually increases; and a curved plate that extends in a bent manner along the outer circumferential edge of the rotary plate and has the same width. This is a mold making device formed from a bent plate.

(Function) When the rotating body is rotated after pushing the protruding piece of the rotary body into the molding sand filled in the joint frame and bringing the rotary plate into contact with the molding sand, the molding sand flows into the joint. It moves to the vicinity of the frame and is filled in a high density state. Next, when the joint frame and casting flask are raised and the upper surface of the molding sand is pressed, the molding sand near the joint frame becomes even more dense, and the entire molding sand reaches the required hardness.

(Example) FIGS. 1 and 2 show a mold making apparatus according to the present invention, in which a movable frame body 1 is formed of a box-like body having a circular hole 2 at the bottom, and an erection plate 3 inside the frame body 1. A motor 4 is attached to the circular hole 2, and a rotating body 5 is attached to the circular hole 2.
is installed. A support member 6 for rotating and supporting the rotating body 5 is interposed between the construction plate 3 and the rotating body 5, and the rotating body 5 is further connected to four shafts of the motor. The rotating body 5 is formed from a circular rotating plate 7 and a plurality of protruding pieces 8 that are vertically disposed on the lower surface of the rotating plate 7. The rotating plate 8 is formed of a curved plate 8a which extends toward the rotary plate 7 and has a width that gradually increases, and a bent plate 8 which extends in a curved manner along the outer peripheral edge of the rotary plate 7 and has the same width.

A squeeze cylinder 9 that can be raised and lowered is provided below the frame 1. A model surface plate 10 is connected to the squeeze cylinder 9. A splicing frame 11 and a casting flask 12 are placed on the model surface plate 10. is formed so that it can be freely inserted into the joint frame 11.

Next, we will discuss the operation.

After casting molding sand 13 into the joint frame 11 and casting flask 12 placed on the model surface plate 10 and cutting the molding sand 13 along the upper surface of the joint frame 11, the frame body 1
is placed above the joint frame 11. Thereafter, when the squeeze cylinder 9 is extended upward and the joint frame 11 is raised to the lower surface of the frame body 1 as shown in FIG. 7 and the lower surface of the frame 1 are molded sand 13
come into contact with. Next, when the rotating body 5 is rotated,
The molding sand 13 is moved toward the joint frame 11 by the projecting piece 8 and is filled in the vicinity of the joint frame 11 in a high density state. Thereafter, as shown in FIG. 2, the bending plate 8b of the protruding piece 8 is stopped on the diagonal line of the joint frame 11, and the squeeze cylinder 9 is then operated to extend upward, so that the lower surfaces of the frame body 1 and the rotary plate 7 are When the upper surface of the molding sand 13 is pressed by the molding sand 13, the molding sand 13 near the joint frame 11 is filled with even higher density, and the entire molding sand 13 has the required hardness.

After the molding sand 13 has hardened, the squeeze cylinder 9 is contracted downward to lower the model surface plate 10 and the splicing frame 11 is removed from the mold.
2 is taken out from the model surface plate 10, a mold as shown in FIG. 3 is obtained. After that, another empty splicing frame 11 and casting flask 12 are placed on the model surface plate 10.

(Effects of the Invention) According to the present invention, a rotating body consisting of a circular rotary plate and a plurality of protruding pieces vertically disposed on the lower surface of the rotary plate is rotatably supported at the bottom of the frame, and the protruding pieces are A curved plate that extends in a curved manner from the axis of the rotating body toward the outer peripheral edge of the rotating plate and whose width gradually increases; and a curved plate that extends in a curved manner along the outer peripheral edge of the rotating plate and has a width. Since it is formed from the same bent plate, the entire molding sand can be easily made to the required hardness, preventing mold deformation and casting pressure caused by the conveyance process or the passage of time, and significantly reducing the occurrence of defective products. do. Furthermore, the grooves in the molding sand formed by the protruding pieces are
Can be used as a gas vent hole.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a mold making apparatus according to the present invention, FIG. 2 is a bottom view of a rotating body, and FIG. 3 is a sectional view showing a mold that has been made. DESCRIPTION OF SYMBOLS 1...Frame body, 5...Rotating body, 7...Rotating plate, 8...Protruding piece, 8a...Curved shape, 8b...Bending plate, 10...Model surface plate, 11...Joint frame, 12...Casting flask, 13...Casting sand .

Claims (1)

[Claims] 1. A mold making device that is provided with a joint frame and a frame body that presses the molding sand filled in the flask above a model surface plate on which a joint frame and a casting flask are placed, and the bottom of the frame body A rotary body consisting of a circular rotary plate and a plurality of protruding pieces vertically provided on the lower surface of the rotary plate is rotatably supported, and the protruding pieces are directed from the axis of the rotary body toward the outer peripheral edge of the rotary plate. It is characterized by being formed from a curved plate that once extended in a curved shape and whose width gradually increases, and a bent plate that extends in a curved shape along the outer periphery of the rotary plate and has the same width. Mold making equipment.