JPH06297082A - Device for filling molding sand - Google Patents

Abstract

PURPOSE:To make the compactness of molding sand good and to reduce the deformation of a lost foam pattern so that vibration force component in the Z-axial (vertical) direction does not generate by the vibration force in the X- axial and the Y-axial (horizontal) directions. CONSTITUTION:In this device, a metallic flask supporting plate 16 having the frame shape for supporting a metallic flask 4 for filling the molding sand with a movable table 3 receiving the vibration in the three-dimensional directions of the X-axial, Y-axial and Z-axial directions, is fixed near the gravity center G of the metallic flask 4. The metallic flask 4 before filling the molding sand received in a prescribed carry-in/ out position at the upper part from the movable table 3, is descended to the metallic flask laying position supporting the metallic flask supporting plate 16 with the movable table 3. A lifting device 19 for lifting the metallic flask 4 after filling the molding sand to the carry-in/out position is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding sand filling device used when filling molding sand having a relatively low viscosity around a fusible model.

[0002]

2. Description of the Related Art As is well known, the method of casting a fugitive model using relatively low-viscosity molding sand (dry sand) is simple in principle, but in reality The strength evaluation of the molded mold is a problem. That is, it is necessary to pay attention to the filling state of the foundry sand. Therefore, as shown in FIG. 5, a metal frame 101 for filling the relatively small viscosity of foundry sand around the disappearing model is provided in the three-dimensional directions of the X-axis, Y-axis and Z-axis in the foundry sand filling device. X-axis variable vibration generation motor 1 mounted on a movable table 102 that can vibrate in the vertical direction.
03, a Y-axis variable vibration generating motor (not shown) and a Z-axis variable vibration generating motor 104, thereby allowing the movable table 10 to move.
2 is given vibrations in the three-dimensional directions of the X-axis, the Y-axis and the Z-axis, and the foundry sand is tamped to obtain the optimum density. Then, in order to control the vibration, the vibration frequency of the variable vibration generating motor for each axis is changed.

[0003]

In the conventional foundry sand filling device having the above-described structure, the metal frame supporting plate 105 is fixed to the lower end of the metal frame 101, and the movable table 102 is provided.
The metal frame 101 carried into a predetermined carrying-in / carrying-out position above
Since the metal frame support plate 105 was supported on the metal frame base 106 on the movable table 102 while maintaining the height level, and the vibration was given, the vibration force in the horizontal (X axis, Y axis) direction is As a matter of course, it is added much below the position of the center of gravity G of the metal frame 101.

As a result, an oscillating load acts on the metal frame 101 due to the above horizontal vibration force, and at that time, a vertical (Z-axis) direction vibration component is generated, so that the original vertical vibration force is generated. May interfere with each other, the vibration waveform for the foundry sand may become unstable, the disappeared model may be deformed, and the foundry sand may not be properly tightened.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to generate a stable vibration waveform by eliminating the swing load on the metal frame due to the horizontal vibration force. Can be done, the tightening of the foundry sand is properly done, and
It is an object of the present invention to provide a foundry sand filling device capable of enhancing the shape retention of a fugitive model.

[0006]

In order to achieve the above object, the present invention provides an X-axis variable vibration generating motor on a movable table on which a metal frame for filling molding sand with the casting sand is placed. The metal frame is movable in a casting sand filling device that applies vibrations in the three-dimensional directions of the X-axis, Y-axis, and Z-axis by the Y-axis variable vibration generating motor and the Z-axis variable vibration generating motor to tamper the foundry sand to an optimum density. A frame-shaped metal frame support plate for supporting the table is positioned near the center of gravity of the metal frame and fixed to the outer periphery of the metal frame before receiving the molding sand filling received at a predetermined loading / unloading position above the movable table. Gold frame
An elevating device is provided for lowering the metal frame support plate to a metal frame mounting position where it is supported by the movable table, and for raising the metal frame after the filling of the molding sand to the carry-in / out position.

[0007]

According to the present invention, the metal frame support plate is positioned and fixed near the center of gravity of the metal frame, and the metal frame support plate is supported on the movable table by receiving the metal frame at the loading / unloading position by the elevating device. The horizontal vibration force is applied to the vicinity of the center of gravity of the metal frame through the movable table. Therefore, the rocking load due to the horizontal vibration force hardly acts on the metal frame, the generation of unnecessary vertical vibration components at that time is almost completely suppressed, and the interference with the original vertical vibration force is prevented. In addition, a stable vibration waveform can be obtained.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a plan view and a front sectional view of a molding sand filling apparatus showing an embodiment of the present invention in a state where a metal frame is placed, and FIGS. 3 and 4 show casting sand in a state where no metal frame is placed, respectively. It is the top view and front sectional view of a filling device.

1 to 4, a movable table 3 is attached to a base 1 via a spring 2 as a cushioning material in X, Y, and
It is provided so that it can vibrate in the three-dimensional direction of the Z axis. The movable table 3 mounts the metal frame 4, and clamps 5 for fixing the metal frame 4 are provided at four corners of the movable table 3.

On one side of the movable table 3 is provided a vibrating machine 6 for vibrating the movable table 3 in the horizontal X-axis direction, and on the other side of the movable table 3, the vibrator 6 is provided. A vibration exciter 7 for vibrating the movable table 3 in the horizontal Y-axis direction is provided. Further, the X-axis vibration exciter 6 and the Y-axis vibration exciter 7 are provided via a spring 8 so as to be capable of vibrating in any of the three-dimensional X-axis, Y-axis, and Z-axis directions. Further, the X-axis vibrator 6 and the Y-axis vibrator 7 are equipped with an X-axis variable vibration generating motor 9 and a Y-axis variable vibration generating motor 10, respectively. And Y-axis variable vibration generation motor 1
Reference numeral 0 denotes an X-axis vibration transmission device 11 and a Y-axis vibration transmission device 1 as static pressure bearings that transmit only vibrations in one direction.
It is connected to the movable table 3 via 2. further,
A Z-axis variable vibration generating motor 13 for vibrating the movable table 3 in the vertical Z-axis direction is provided on the lower surface of the movable table 3. Reference numerals 14 and 15 are balance weights for each vibration in the horizontal (X-axis, Y-axis) direction.

Reference numeral 16 denotes the metal frame 4 and the movable table 3
It is a bracket-shaped metal frame support plate for supporting the metal frame 4, and is fixed near the center of gravity G of the metal frame 4 and fixed to the outer periphery thereof. The movable table 3 is formed with a hole 3a through which the lower part of the metal frame 4 below the metal frame support plate 16 can be inserted.
The upper surface of the opening end 3b of a constitutes a supporting surface of the metal frame supporting plate 16.

A loading / unloading position of the metal frame 4 is set above the movable table 3 at the same level as that of the roller conveyor 17 as a metal frame transporting device, and is formed below the loading / unloading position. An elevating device 19 for the metal frame 4 is installed in the recess 18. This lifting device 19
For example, a link type telescopic arm 20 is provided, and a metal frame base 22 for receiving the metal frame 4 before being filled with the molding sand at the carry-in / out position via a metal frame roller conveyor 21 is installed at the upper end thereof. The metal frame 4 is lowered from the loading / unloading position to the metal frame mounting position, and the metal frame 4 after casting is raised from the metal frame mounting position to the loading / unloading position.
The metal frame base 22 is provided with a slip-prevention mechanism 23 in order to prevent the metal frame 4 from moving up and down when it moves up and down.

Next, the operation of the molding sand filling device having the above-mentioned structure will be described. After raising and lowering the elevating device 19, the metal frame 4 before being filled with the molding sand is received on the metal frame roller conveyor 21 from the roller conveyor 17 at a predetermined loading / unloading position,
When the raising device 19 is lowered, the metal frame 4 is also lowered, the lower side thereof passes through the hole 3a of the movable table 3, and the metal frame support plate 16 is moved to the lower side, as shown in FIGS. 1 and 2. The metal frame 4 is placed on the movable table 3 while being supported by the upper surface of the opening end 3b of the hole 3a. Then, in this state, the four corners of the metal frame support plate 16 are fixed to the movable table 3 by the clamps 5.

Next, an appropriate amount of molding sand is put into the inside of the metal frame 4, the vanishing model is placed on the floor formed by tamping, and the periphery of the vanishing model is filled with the casting sand. In this state, the X-axis variable vibration generating motor 9, the Y-axis variable vibration generating motor 10 and the Z-axis variable vibration generating motor 13 are selectively driven to vibrate the movable table 3 in the X-axis, Y-axis and Z-axis directions. . As a result, three-dimensional vibration is also applied to the foundry sand, and the foundry sand is compacted to an optimum density.

At this time, the metal frame support plate 16 is fixed near the center of gravity G of the metal frame 4, and the metal frame support plate 16 is fixed.
Since the movable table 3 is directly supported by the movable table 3, horizontal vibration force by the X-axis and Y-axis variable vibration generating motors 9 and 10 must be applied to the vicinity of the center of gravity G of the metal frame 4 via the movable table 3. become. Therefore, the oscillating load due to the horizontal vibration force hardly acts, and the component of the vertical vibration force due to the vibration load becomes negligible. There is no danger of interfering with the vibration force of. As a result, it becomes possible to finely control the vibration force in the three-dimensional direction according to the shape, size and weight of the vanishing model, and a stable vibration waveform can be obtained. Therefore, the foundry sand flows smoothly, the tightness of the disappearing model around is improved, and the possibility of deformation of the disappearing model is eliminated.

When the filling of the foundry sand is completed, the elevating device 19 is raised to move the metal frame 4 as shown in FIG.
Together with the metal frame roller conveyor 21 and the like to the predetermined loading / unloading position. The metal frame 4 is carried out from this carry-in / out position. That is, since the metal frame 4 can be transferred between the predetermined loading / unloading position and the metal frame mounting position by the elevating device 19, it is possible to easily cope with the continuous casting process without lowering the casting efficiency. Become.

[0017]

As described above, according to the present invention, the metal frame support plate is fixed near the center of gravity of the metal frame for filling the molding sand with the casting sand, and the X-axis, Y-axis and Z-axis are fixed. The metal frame received at a predetermined loading / unloading position above the movable table that is vibrated in the three-dimensional direction is set by the elevating device to the metal frame mounting position where the metal frame support plate is supported by the movable table. Therefore, the horizontal vibrating force of the X-axis and the Y-axis is applied to the vicinity of the center of gravity of the metal frame, and the swinging load due to the horizontal vibrating force acts on the metal frame to cause the original vertical motion. Since it does not interfere with the directional vibration force, the molding sand can be satisfactorily compacted with a stable vibration waveform.

[Brief description of drawings]

FIG. 1 is a plan view showing a molding sand filling device according to an embodiment of the present invention in a state in which a metal frame is placed.

FIG. 2 is a front cross-sectional view showing the foundry sand filling device according to the above embodiment in a state in which the metal frame is placed.

FIG. 3 is a plan view showing the foundry sand filling device in the same embodiment as above, in a state where a metal frame is not placed.

FIG. 4 is a front cross-sectional view showing the foundry sand filling device in the same embodiment as above, in a state where a metal frame is not placed.

FIG. 5 is a configuration diagram showing a conventional foundry sand filling device.

[Explanation of symbols]

 3 movable table 4 metal frame 9 X-axis direction variable vibration generation motor 10 Y-axis direction variable vibration generation motor 13 Z-axis direction variable vibration generation motor 16 metal frame support plate 19 lifting device

Claims (1)

[Claims] 1. An X-axis variable vibration generating motor, a Y-axis variable vibration generating motor, and a Z-axis variable vibration generating motor are used to move an X-axis variable vibration generating motor to a movable table on which a metal frame for filling the molding sand around the vanishing model is mounted. In a foundry sand filling device that applies vibrations in three-dimensional directions of axes, Y-axis and Z-axis to compact the foundry sand to an optimum density, a frame-shaped metal frame support plate for supporting the metal frame on a movable table is provided. Of the metal frame before being filled with the molding sand, which is fixed near the center of gravity of the mold and fixed to the outer periphery thereof, and received at a predetermined loading / unloading position above the movable table. A casting sand filling device, characterized in that an elevating device is provided for lowering to a loading position and raising a metal frame filled with casting sand to the carry-in position.