JP2002160042A - Molding apparatus for casting mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an elevating table from abrupt descending during either filling of molding sand into a molding frame or pre-compression of the sand in the frame, in a molding apparatus for a casting mold which employs compressed air for either filling of molding sand into the frame or pre-compression of molding sand in the frame. SOLUTION: The apparatus is characterized in that a wedge-type stopper mechanism 6 which temporally prevents descending of the elevating table 3 holding a pattern plate 18 on it, during either filling of molding sand into the molding frame 19 or pre-compression of the sand in the frame 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mold making machine in which molding sand is filled in a molding flask or pre-compression of molding sand in the molding flask is performed by using compressed air.

[0002]

2. Description of the Related Art In general, in this type of mold making machine, an elevating table on which a model plate is placed and moved up and down is operated by an expansion and contraction operation of a hydraulic cylinder.

[0003]

By the way, in the case of a hydraulic cylinder, the pressing force of the hydraulic cylinder is set to a magnitude necessary for the function as a mold making machine due to the price. Oil pressure may leak from a gap with a cylinder or a check valve provided in a hydraulic circuit, and the pressing force may become smaller than required.

As a result, in the conventional molding machine configured as described above, when the molding sand is filled into the molding flask or when the molding sand in the molding flask is pre-compressed, the lifting table is instantaneously lowered. A gap is formed between the sand blowing device and the casting frame in the mold making machine, or between the compressed air blowing device and the casting frame in the mold making machine, and molding sand or compressed air is ejected from the gap. Problems may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a lifting table which is used when molding sand is filled in a casting flask or when molding sand is pre-compressed. An object of the present invention is to provide a molding machine that does not instantaneously descend.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a mold molding machine according to the present invention uses a compressed air for filling a molding sand into a molding flask or for pre-compressing molding sand in the molding flask. In a mold making machine that is designed to perform, when the molding sand is filled into the casting flask or when the molding sand in the casting flask is pre-compressed, the descent of the elevating table for placing and lifting the model plate is temporarily prevented. A wedge mechanism is provided.

[0007] With such a construction, when the molding sand is filled into the casting flask or when the molding sand in the casting flask is pre-compressed, the lifting table is caused to function as a wedge mechanism to temporarily lower the lifting table. To block.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mold making machine to which the present invention is applied will be described below in detail with reference to FIG.
In the mold making machine of the present invention, an upward hydraulic cylinder 2 is mounted at the center of a base 1 in the form of a platen, and an elevating table 3 is fixed to the tip of a piston rod of the hydraulic cylinder 2. It is. A guide rod 4 is suspended from the lower surface on the right side of the lifting table 3, and the guide rod 4 is slidably inserted into a holder 5 mounted on the base 1.

A wedge mechanism 6 is disposed below the guide rod 4 on the lower surface of the base 1. The wedge mechanism 6 includes a lateral cylinder 7 mounted on the lower surface of the base 1. A wedge body 8 fixed to the tip of the piston rod of the cylinder 7, a support member 10 mounted on the lower surface of the base 1 via a bracket 9 and supporting the wedge body 8 slidably to the left and right; The wedge body 8 is fixed to the lower end of the guide rod 4 and is constituted by a receiving member 11 which can be engaged and slidable.

Further, at the four corners on the base 1, support columns 12 are provided.
12 is a standing plate-like frame having a flanged roller conveyor 13 extending in the left-right direction between the middle positions, and a compressed air outlet 14 near the center between the upper ends. 15 are installed respectively. An opening / closing mechanism (not shown) for opening and closing the air outlet 14 is provided on the upper surface of the frame 15, and a cover 16 that forms a compressed air storage tank with the frame 15 is hermetically mounted. The lower surface of the frame 15 is provided with the outlet 14.
Is mounted.

In the figure, reference numeral 18 denotes a model plate with a vent plug buried in the surface, 19 denotes a cast frame, and 20 denotes a fill frame.

The apparatus having the above-described configuration includes a filling frame 20 into which molding sand S has been introduced by a molding sand introduction device (not shown).
Roller conveyor 1 with brim for casting frame 19 and model plate 18
3, the hydraulic cylinder 2 is extended and the filling frame 20, the casting frame 19 and the model plate 18 are raised by the elevating table 3, and the filling frame 20 is moved.
Is brought into contact with the frame 17.

Next, the cylinder 7 of the wedge mechanism 6 is extended to cause the wedge main body 8 to enter between the receiving member 11 and the support member 10, and then the compressed air in the cover 16 is blown out of the outlet 14.
The molding sand S in the filling frame 20 and the like is preliminarily compressed by compressed air. In this case, the lifting table 3 is prevented from descending by the wedge mechanism 6 and does not descend when the compressed air is supplied into the filling frame 20 or the like.

Next, the cylinder 7 of the wedge mechanism 6 is contracted to retract the wedge main body 8 from between the receiving member 11 and the support member 10, and then a normal mold forming process is performed.

Although the above embodiment is applied to a molding machine for pre-compressing molding sand in a flask using compressed air, the molding sand is blown into the molding flask using compressed air. The same operation and effect can be obtained even when the present invention is applied to a molding machine for filling and filling.

[0016]

As is apparent from the above description, the present invention relates to a mold molding machine in which molding sand is filled into a casting mold or pre-compression of the molding sand in the casting mold is performed by using compressed air. A wedge mechanism for temporarily preventing the lowering of the elevating table on which the model plate is placed and raised when the casting sand is filled in the casting flask or when the casting sand in the casting flask is pre-compressed is provided. Excellent practical effects such as being able to accurately prevent instantaneous lowering of the elevating table when sand is filled into the casting flask or when the molding sand in the casting flask is pre-compressed. Play.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an embodiment of a mold making machine to which the present invention is applied.

[Explanation of symbols]

 3 Elevating table 6 Wedge mechanism 18 Model plate 19 Cast frame

Claims (1)

[Claims] 1. A molding machine in which a molding sand is filled in a molding flask or a preliminary compression of the molding sand in the molding flask is performed by using compressed air. A mold molding machine, comprising: a wedge mechanism for temporarily preventing a descent of an elevating table for placing and elevating a model plate when preliminarily compressing molding sand in a casting flask.