JPH05309446A - Three dimensional vibration type molding sand packing equipment for casting - Google Patents

Abstract

PURPOSE:To provide a three dimensional vibration type molding sand packing equipment for casting which appropriately packs the sand grains in the periphery of a disappearing model arranged within a metallic flask by simple constitution and control. CONSTITUTION:A three dimensional vibration type molding sand packing equipment for casting 100 mainly consists of a base 11, four pillars 12 which are vertically provided to four parts in the periphery of the base 11, an air spring 15 arranged to the upper edge surface, a metallic flask base plate 21, and a pair of vibration motors 31 to be fixed in the vicinity of each end of the metallic flask base plate 21. A pair of the vibration motors 31 to be fixed in the vicinity of each end of the metallic flask base plate 21 are driven so that the approximately same number of revolution and the amplitude in the same rotational direction may be obtained when viewed from the top of the base plate 22, and a metallic flask 41 is vibrated in a three dimensional mode through the metallic flask base plate 21. The three dimensional vibration type molding sand packing equipment for casting 100 allows the optimum three dimensional mode vibration of the base plate 22 of the metallic base plate 21 by simple constitution and control without difficult adjustment or the like, and also allows the appropriate packing of the molding sand grains in the periphery of the disappearing model 70 arranged within the metallic flask 41 on the base plate surface 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional vibrating sand filling machine for filling sand grains in a vanishing model arranged in a casting metal frame.

[0002]

2. Description of the Related Art Heretofore, a casting method has been known in which a mold is formed by using a plastic mold made of a polystyrene resin which has been previously press-fitted into a mold. The above-mentioned plastic mold is said to be a disappearing model, and since it burns at about 400 ° C in the casting process, it is a one-time model that can be easily burned off from the mold. Then, in order to form the mold, it is necessary to dispose a vanishing model in the metal frame and to fill the periphery thereof with sand grains such as dry silica sand.

[0003]

[Problems to be Solved by the Invention] However, in reality,
It is difficult to arrange a vanishing model in a metal frame and to fill it with sand particles such as dry silica sand in just enough amount, and it is difficult to specify the direction of the vibration vector of multiple vibration motors. I didn't know about that.
Therefore, it is not possible to completely fix the plurality of vibration motors, and it is necessary to provide a mechanism that allows adjustment, and it is necessary to experimentally determine the adjustment position each time. Further, at this time, it was not known how to control the plurality of vibration motors.

The present invention has been made to solve the above problems, and an object thereof is to provide sand grains around a vanishing model arranged in a metal frame with a simple structure and control. It is an object of the present invention to provide a three-dimensional vibrating sand filling machine for casting, which can be filled without excess or deficiency.

[0005]

The structure of the invention for solving the above-mentioned problems is a three-dimensional vibrating sand filling machine for filling sand grains around a vanishing model arranged in a casting metal frame. ,
A base made of a rigid body having a plurality of columns, an air spring disposed on the upper end surface of each column of the base and having an adjustable air pressure, and the metal frame is placed and fixed horizontally on the air spring. And a metal frame base plate having a substrate surface for, and a vibration vector in the plane direction on the same plane perpendicular to the substrate surface of the metal frame base plate is approximately 45 ° upward from the periphery of the substrate surface toward the center. A pair of vibration motors fixed to both ends of the metal frame base plate so as to form an angle, and the pair of vibration motors have substantially the same rotation speed and amplitude in the same rotation direction when viewed from the substrate surface. And a vibration control means for three-dimensionally vibrating the metal frame via the metal frame base plate.

[0006]

According to the above means, the base plate surface of the metal frame base plate is made horizontal on the air springs arranged on the upper end surfaces of the columns of the base. A pair of vibration motors fixed near both ends of the metal frame base plate are driven so as to have substantially the same number of rotations and amplitude in the same rotation direction as viewed from above the substrate surface, and through the metal frame base plate. The metal frame is vibrated in three dimensions. The vibration vector in the plane direction on the same plane perpendicular to the substrate surface of the metal frame base plate in the three-dimensional vibration due to the driving of the pair of vibration motors is based on the fixing direction with respect to the metal frame base plate and the center from the peripheral edge of the substrate surface. The angles are approximately 45 ° upward toward each other and are at right angles to each other. Then, the metal frame placed and fixed on the substrate surface is also vibrated in the same manner, and the sand grains supplied into the metal frame are repeatedly moved in the metal frame in the order of central part → peripheral part → central part → ... A perfect mold is formed by filling the voids with the model without excess or deficiency.

[0007]

EXAMPLES The present invention will be described below based on specific examples. FIG. 1 is a front view showing a three-dimensional vibrating sand filling machine for casting according to the present invention, FIG. 2 is a side view, and FIG. 3 is a top view. The three-dimensional vibrating sand filling machine 100 for casting is mainly composed of a base 11, four pillars 12 standing upright at four positions around the base 11, air springs 15 arranged on their upper end faces, and a metal frame base. The plate 21, a substrate surface 22 thereof, and a pair of vibration motors 31 fixedly mounted on the metal frame base plate 21. As shown in FIG. 3, the pair of vibration motors 31 are arranged so that the rotating shafts are located in the same plane perpendicular to the substrate surface 22 of the metal frame base plate 21 in the widthwise center direction of the substrate surface 22. It is arranged.

The base 11 and the pillar 12 are rigid bodies and are directly fixed to the floor which has a large mass and is hard to resonate. Those pillars 12
Air springs 15 are respectively arranged on the upper end surfaces of the. The four corners of the substrate surface 22 of the metal frame base plate 21 are elastically supported by the air springs 15, respectively.
2 is held horizontally. On the substrate surface 22, a metal frame 41 having the disappearing model 70 disposed therein is placed, and is clamped and fixed at the peripheral portion of the substrate surface 22.

Next, the structure of the air unit 50 for operating the air spring 15 will be described with reference to FIG. The air unit 50 includes a stop valve 51, an air filter 52, a pressure reducing valve 53, and a manual switching valve 54. The high-pressure air sent through the high-pressure air pipe is made to have a predetermined pressure by the pressure reducing valve 53, and the manual switching valve 54 causes each air spring 1 to move.
The required amount of air is injected into 5. Then, as shown in FIGS. 1 and 2, the substrate surface 22 of the metal frame base plate 21 is in a state of being floated from the stopper 13 provided on the pillar 12 of the base 11.

Next, the case where the pair of vibration motors 31 are operated in the casting three-dimensional vibration type sand filling machine 100 according to this embodiment will be described. A pair of vibration motors 31 fixed to the metal frame base plate 21 supported by the air springs 15.
Are driven at substantially the same rotation speed (3000 to 4000 rpm) in the same rotation direction when viewed from the substrate surface 22, as shown by the arrow direction in FIG. At this time, since the balance weight positions of the pair of vibration motors 31 are the same, the amplitudes thereof are also substantially the same. When the pair of vibration motors 31 are driven, the vibration vector in the plane direction on the same plane perpendicular to the substrate surface 22 of the fixed metal frame base plate 21 is the substrate surface 22.
It becomes the same size in the upward direction at an angle of about 45 ° from the periphery to the center. The metal frame 41 clamped and fixed to the substrate surface 22 is also vibrated in the same direction by the vibration of the pair of vibration motors 31. Sand particles such as dry silica sand are supplied to the metal frame 41 from a supply pipe (not shown) arranged above the metal frame 41. The supplied sand grains are repeatedly moved in the metal frame 41 in the order of central portion → peripheral portion → center portion → ... by the above-described three-dimensional vibration, and are deposited so that the height difference does not occur in the metal frame 41. It was confirmed that As a result, the gold frame 4
Sand grains are filled around the vanishing model 70 arranged in the unit 1 in just proportion.

[0011]

The present invention is constructed as described above, and the pair of vibration motors are fixed to the metal frame base plate on the air springs at a preset angle near both ends of the metal frame base plate. It is a simple structure that only needs to be installed facing each other and does not require fine adjustments. Further, even when driving the pair of vibration motors, it is not necessary to perform any difficult control because the rotation speed and the amplitude are substantially the same in the same rotation direction when viewed from the substrate surface. That is, the three-dimensional vibration type sand filling machine for casting of the present invention can optimally three-dimensionally vibrate the substrate surface of the metal frame base plate with a simple configuration and control, and disappears in the metal frame on the substrate surface. There is an effect that the sand grains can be filled around the model without excess or deficiency.

[Brief description of drawings]

FIG. 1 is a front view showing a configuration of a casting three-dimensional vibrating sand filling machine according to a specific embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a top view of FIG.

FIG. 4 is a block diagram showing a configuration of an air unit that supplies air to an air spring of the three-dimensional vibration sand filling machine for casting according to the embodiment.

[Explanation of symbols]

 11-base 12-pillar 15-air spring 21-metal frame base plate 22-substrate surface 31-vibration motor 41-metal frame 70-disappearance model 100-three-dimensional vibration sand filling machine for casting

Claims (1)

[Claims] 1. A three-dimensional vibrating sand filling machine for filling sand grains around a vanishing model arranged in a casting metal frame, the base comprising a rigid body having a plurality of columns, and the base. An air spring disposed on the upper end surface of each pillar of which the air pressure is adjustable, a metal frame base plate having a substrate surface for horizontally mounting and fixing the metal frame on the air spring, and the metal frame In the same plane perpendicular to the substrate surface of the base plate, the vibration vector in the plane direction is fixed near both ends of the metal frame base plate so that the vibration vector in the plane direction becomes an angle of about 45 ° upward from the peripheral edge of the substrate surface toward the center. A pair of vibration motors to be installed, and the pair of vibration motors are driven so as to have substantially the same number of rotations and amplitude in the same rotation direction when viewed from the surface of the substrate, and the metal frame is moved through the metal frame base plate. A three-dimensional vibrating sand for casting, characterized by comprising a vibration control means for vibrating in three dimensions. Filling machine.