JPH11197790A - Two station type automatic vibration molding machine for green sand mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a molding machine for green mold, in which the molding speed is quick and the production efficiency in a forming process of the mold is extremely high without using an expensive hydraulic device as a pressurizing means. SOLUTION: A rotary fork 17 which is constituted so as to be horizontally rotated around a vertical shaft and possible to set a molding flask 8 at both end parts thereof, is arranged. Further, a sand charging station A and a molding station B are disposed the position in which the rotary fork turns through the angle of 180 deg.. In the sand charging station A, the molding sand is filled up into the molding flask 8 with the addition of vibration, and in the molding station B, the molding is executed by vibrating the pressing plate 6 of a vibrating head 2 and using the pressurizing force with the expansion of an air spring means 3, and then, the molding sand filling process and the mold forming process are simultaneously progressed at the separating position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a green molding machine for castings.

[0002]

2. Description of the Related Art As a green molding machine for this type of casting,
Conventionally, a Jolt system, a squeeze system, or a blow system is generally used. With the Jolt method, sand is poured into a casting frame on a model placed on the table of a molding machine, compressed air is sent to an air cylinder installed at the bottom of the table, and a piston integrated with the table is lifted up to lift the table After that, the table is dropped freely by evacuating at a certain height, and the table and cylinder collide and the sand in the flask is tightened toward the lower model by the inertia force of the sand itself, It has the basic structure of a conventional green molding machine.

[0003] In the squeeze method, sand in a casting flask is slightly smaller than the inner dimension of the frame by using pneumatic or hydraulic cylinders from above with an air cylinder (sometimes using a diaphragm). It consists of a mechanism for pushing the pressure plate into the frame (there is also a plurality of cylinders and pressure plates). Alternatively, a mechanism is provided in which the casting flask containing sand on the model is raised by a pneumatic or hydraulic squeeze cylinder together with a table above the cylinder toward a pressure plate fixed above the casting flask to suppress the casting flask.

[0004] The blow method is a method of filling a space between a model plate and a pressure plate in a casting flask with sand using an air flow, and there are a blow-in method and a reduced-pressure suction method.

[0005]

As the above-mentioned conventional green molding machine, a main mechanism for clamping the mold and a die-cutting mechanism for separating the clamped frame from the model (the frame is lifted from the fixed model upwards). Stripper that pulls out the model, and a pattern draw that pulls the model down from the fixed frame).
Further, various types of molding machines, such as a framing method and a blanking method in which a frame is built in a molding machine, are used.

A molding machine having only the functions of the Jolt system and the squeeze system, using a top and bottom double-sided match plate as a model, using a tapered blanking frame, first forming a lower mold and inverting the mold. Next, an upper die is formed, and die cutting is also performed manually. In this case, there is an advantage that it is possible to cope with complicated molds, depending on the skill level of the operator, but there is an advantage that the upper and lower frames can be simultaneously inverted, and the mold can be removed by lifting the frame or model by hand. For example, molding has a drawback that requires labor, and accordingly, the number of skilled workers who can use this model is decreasing year by year. In addition, the frame is limited to a small one that can be held by a hand, and the jolt operation has a problem that a metal impact sound and vibration are generated due to a drop impact of the table, and the table may be broken.

[0007] The functions of the Jolt method and the squeeze method
With a stripper (or pattern draw) that has a die-cutting function, the frame is not held in the hand and is applied to medium or higher, and the use of a stripped frame is rare. Therefore, there is an advantage in that there are many semi-automatic uses in general, and there is considerable versatility for types of models. However, as the molding machine becomes larger, the jolt sound and vibration increase, and the squeezing force becomes several tens of tons, increasing the risk of damage to the parts. Therefore, it is necessary to use two molding machines or to separately provide a device for alternately switching a model between an upper mold and a lower mold, which is disadvantageous in that equipment costs are high.

On the other hand, a blow squeeze provided with a blow mechanism for filling sand in a space in a frame by an air flow is generally used for mass production of small articles, has a high molding speed, has many blanking frames, and has a core. Many are fully automatic except for the insertion work, and some have an automatic core insertion device. This method has the advantage that the molding speed is fast, but it has directionality to fill the sand with the air flow, and depending on the shape of the model, shading may occur and correction may be made even if there is a poor filling part. There is a problem that cannot be added. In addition, the model wears faster due to the sandblast effect, so that the model is often made with a mold and the model cost is increased. Further, there is also a problem in that the blow-related parts are consumed a lot, the maintenance cost is expensive, and the squeeze is inevitably expensive because the hydraulic device is often used.

In any of the above-mentioned Jolt system, squeeze system, or an improved system thereof, the steps of filling with sand and compression molding are performed in a series of flows at the same place. Since there is no other way but to start a new casting frame process after the molding is completed, there is a problem that the production efficiency is not improved.

In view of the problems of the prior art, the present invention does not use an expensive hydraulic device as a pressurizing means, has a high molding speed, and has a very high production efficiency in a mold forming process. An object is to provide a molding machine.

[0011]

In order to achieve the above-mentioned object, a two-station type automatic vibration molding machine according to the present invention rotates horizontally around a vertical axis and installs a flask 8 at both ends thereof. A rotatable fork 17 is provided so as to be able to be used, and a sand-filling station A and a molding station B are arranged at the 180-degree rotation position thereof. And model stand 1
1 and a vibration table 19
And an air spring 20 for vertically displacing and supporting the vibrating head. The vibrator head is provided with a vibration motor 1 for vibrating the pressure plate 6 at the molding station B. 2 is suspended from the upper frame 4 by air spring means 3 which expands and contracts in the vertical direction,
The vibra head 2 is moved to the uppermost position where the air spring means 3 is compressed to separate the pressure plate 6 from the casting flask 8, and the lowering position where the air spring means 3 is extended to press the molding sand of the casting flask 8. An elevating means 5 for raising and lowering is provided, and the molding sand of the casting flask 8 is filled by the weight of the pressure plate 6 and the pressing force by the extension of the air spring means 3 and the exciting force of the vibration motor 1 attached to the vibra head 2. It is configured to be hardened, and a roller chuck 7 is provided to hang down from the upper frame 4 to carry out to the outside while holding the lower part of the flask 8 after the pressure molding, and to empty the flask 8 from outside. Is closed so as to carry in and hold it, and is opened during pressure molding and when the casting frame 8 is raised and lowered by the table lifting and lowering means 16. Vibration from below against frame 8 Means that a molding sand filling step using a cable 19 and a molding step of performing pressure molding while applying vibration to the pressure plate 6 above the casting frame 8 at the molding station B are simultaneously performed at different positions. Was taken.

In the present invention, in the sanding station A, an air vibrator 18 for vibrating the vibration table 19 is provided on a part of the lower frame 13 via an air spring 20, and in the molding station B,
It is preferable that a pair of the air spring means 3 and the vibration motor 1 be provided with a phase shift of 90 degrees from each other.

In the present invention, the elevating means 5 of the vibra head 2 of the molding station B comprises an electric motor 5a, a chain driving means 5b driven by the electric motor 5a, and an elevating grip part 5c.
In the uppermost position of the mold, the molded flask 8 and the empty flask 8 are exchanged, and at the lowered position, the pressure plate 6 descends more than the depth of being pushed into the molding sand, and the pressure plate 6 is moved upward and downward by the lifting grip 5c. It is preferable to be configured so that the edge is cut off and freely hangs.

[0014]

According to the present invention, the casting sand is filled into the casting frame 8 by simply dropping the casting sand instead of filling it with air blow or other means. There is no problem such as abrasion. Then, the molding sand filled in the casting flask 8 is subjected to the pressure of the free (free-falling state) of the pressure plate 6 and the pressure of the vibration motor 1 and the like, the pressure of the air spring 3 extending, and the pressure of the vibration motor 1. The three types of vibrating force are directly received and compressed tightly, and uniform mold hardness can be obtained in a short time. Of course, when the molding sand is vibrated by the vibration motor 1, the fluidity of the molding sand is enhanced, and the filling of the shaded portion due to the shape of the model becomes smooth.

The pressure due to the weight of the pressure plate 6 and the pressure generated by the expansion of the air spring 3 and the vibration generated by the vibration motor 1 is about 2 kg / cm ² or less (compared to the conventional hydraulic [pneumatic] system). (Approximately 1/5), but a mold hardness of about 90 is obtained as a result.

In particular, the rotary fork 1 is configured to rotate horizontally about a vertical axis, and to be able to set a casting frame 8 at both ends thereof.
7 and the sand filling station A and the molding station B are arranged at the 180-degree rotation position so that the casting sand filling step and the mold molding step are simultaneously performed at different positions. Efficiency can be dramatically improved, and chiller installation, pocket sand, skin sand and back sand can be freely added at the sanding station A. Various materials and complex castings can be produced while increasing production efficiency. Can be produced.

In the present invention, in the sand putting station A, an air vibrator 18 for vibrating the vibration table 19 is provided on a part of the lower frame 13 via an air spring 20, and in the molding station B,
When a pair of the air spring means 3 and the vibration motor 1 are provided with a phase shift of 90 degrees from each other, the air vibrator 18 is used at the time of filling the molding sand at the sand filling station A.
Is applied to the molding sand to fill the corners of the model 10, and at the molding station B, the vibration motor 1 also applies vibrations to the molding sand via the pressure plate 6 to reliably fill the corners. In combination with the weight balance of the vibration motor 1 opposed to the pressure plate 6 and the good vibration transmission, the pressure plate 6 sufficiently exerts a pressurizing action on the sand and the vibration transmission is evenly performed. We can make sure molding.

Further, the elevating means 5 of the vibra head 2 of the molding station B is constituted by an electric motor 5a, a chain driving means 5b driven by the electric motor 5a, and an elevating grip 5c. Replace the empty flask 8 with the empty flask 8;
When the pressure plate 6 is lowered more than the depth of being pressed into the casting sand at the lowering position, and the pressure plate 6 is configured so that the edge thereof is cut off from the lifting / lowering grip portion 5c and is freely suspended, the vibra The vibration of the head 2 is not transmitted to the lifting / lowering grip 5c, and there is little risk of trouble occurring due to the vibration.

When the rotating shaft 21 of the rotating fork 17 also serves as a support for supporting the upper frame 4, a part (support) of the components of the main body frame is used, so that the member is also used. Become.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the automatic vibration molding machine for green mold according to the present invention will be described below in detail with reference to the drawings. FIG.
FIG. 2 is a side view of the entire automatic vibration molding machine for green mold according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof. In FIGS. 1 and 3, the vertical movement of each part is separately illustrated on the left and right sides of the center vertical broken line.

This automatic vibration molding machine is basically configured so that the casting flask 8 is loaded in a horizontal direction by an appropriate known means (a roller conveyor or the like), and is removed from the other after molding. Here, a rotating fork 17 configured to support the spar of the upper frame 4 and to horizontally rotate around the longitudinal axis of a column 21 which is a part of the main body frame and to install the casting frame 8 at both ends thereof. Are provided, and a sand putting station A and a molding station B are arranged at the 180-degree rotation position. The rotary fork 17
Is formed in a frame shape, and in the molding station B,
The casting flask 8 placed here is configured to be able to raise the model 10 and the model base 11 together with the lifting table 14 by raising the lowering means 16 below.

First, the molding station B will be described. The upper frame 4 is provided above the main body frame raised from the lower frame 13, and four hydraulic lifting cylinders 16 generated by air pressure are provided below the main frame,
The four corners of the lifting table 14 are supported. Reference numeral 15 denotes a cylindrical guide which guides the elevating table 14 to vertically move up and down.

Reference numeral 7 denotes a pair of right and left roller chucks 7 hanging down from the upper frame 4 for holding the lower portion of the molding flask 8 after the pressure molding, carrying out the molding to the outside, and emptying the empty space from the outside. The closing operation is performed to carry in and hold the casting flask 8, and the casting flask 8 is pressed by the
It is configured to be opened when moving up and down. At the lower end of the roller chuck 7, a roller on which the casting flask 8 is mounted is provided, and the level and the trajectory of the external roller conveyor are matched. And the roller chuck 7 is
It is pivotally attached to the upper frame 4 so as to be able to swing about a horizontal axis, and is operated by an appropriately known air cylinder (not shown). As shown by the arrows in FIG.
For example, it is carried in from the right and carried out to the left.

Reference numeral 1 denotes a vibration motor, which vibrates a pressure plate 6 described later, and is provided on the vibra head 2. The vibration motor 1 is an electric vibration motor, but may have another known structure. The vibra head 2 is suspended from the upper frame 4 by air spring means 3 which expands and contracts in the vertical direction.

A pair of the air spring means 3 is provided to face each other, and the vibration motor 1 is also provided with the air spring means 3.
A pair is provided so as to face 3 with a phase shift of 90 degrees. Then, the vibra head 2 is moved to the uppermost position where the air spring means 3 is compressed to separate the pressure plate 6 from the casting flask 8 and the lowering position where the air spring means 3 is extended to press the molding sand of the casting flask 8. Lifting means 5 for raising and lowering the casting sand of the casting flask 8, the pressing force by the weight of the pressure plate 6 and the extension of the air spring means 3, and the exciting force of the vibration motor 1 attached to the vibra head 2. To fill and cure.

The elevating means 5 comprises an electric motor 5a, a chain driving means 5b, and an elevating grip 5c. At the uppermost position of the vibra head 2, the molded flask is replaced with an empty flask. Further, at the lowering position, the pressure plate 6 descends more than the depth of being pushed into the casting sand, and the pressure plate 6 is cut off the edge with the lifting / lowering grip portion 5c to be freely suspended. In the figure, reference numeral 9 denotes an auxiliary frame placed on the flask 8, reference numeral 10 denotes a model located at the bottom of the flask 8, and reference numeral 11 denotes a model stand on which the model 10 is mounted. Reference numeral 12 denotes a frame holder, which is suspended from the vibra head 2 via a spring,
When the vibra head 2 is lowered, its tip contacts the upper surface of the auxiliary frame 9 via a cushion by a spring,
It plays the role of holding down during molding.

Next, the sand putting station A will be described. Here, the model 10 and the model stand 11 on which
A vibration table 19 and an air spring 20 that supports the vibration table 19 and vertically displaces the vibration table 19 are provided to apply vibration and fill the molding sand. Of course,
At this time, installation of chiller, pocket sand, skin sand,
The work of adding back sand or the like may be freely performed. In addition, as a means for filling the casting sand, a known means (from a hopper) may be appropriately used. The vibration of the vibration table 19 is performed by the air vibrator 18 and transmitted to the model 10. Therefore, the casting sand filled in the casting flask 8 at the sanding station A is filled into every corner by the vibration of the air vibrator 18, and thereafter,
The flask 8 is positioned at the molding station B by the 80-degree rotation.

With such a configuration, the molding sand in the molding flask 8 and the molding by the pressure plate 6 can be made to proceed simultaneously in the sanding station A and the molding station B while changing places.

[0029]

According to the present invention, the following excellent effects are achieved. The filled sand of the molding flask is subjected to three steps of the pressing force by the weight of the pressure plate and the extension of the air spring means and the exciting force of the vibration motor.
Approximately 2k despite small surface pressure generated by various types of force
A mold hardness of about 90 can be obtained at g / cm ² or less (conventionally, a power of about 10 kg / cm ² ± 5 kg / cm ² is required), and there is an advantage that a mold having uniform hardness can be molded in a short time. Since a precise and large hydraulic (pneumatic) cylinder or the like is not used, the manufacturing cost of the molding machine is reduced. At the same time, maintenance and inspection,
There are also conservation advantages.

Since the casting sand is not filled by the blow method as in the prior art, the wear of the model is extremely small. Therefore, the cost is lower than that of making a metal model, and there is no replacement due to abrasion. It is advantageous. Since the filling is performed by the above three types of forces including vibration, the molding speed is sufficient, but the filling of the shaded area by the shape of the model is smooth, and the molding error can be avoided. Also exist.

In particular, by providing the rotating fork, the process of filling the casting flask with the molding sand and the molding process using the pressure plate can be performed at the same time while changing the location between the sand filling station and the molding station. Thus, there is an advantage that the production efficiency can be greatly improved. In addition, additional work such as chiller installation and skin sand filling can be performed using the time and place at the sanding station without reducing the production speed, so it can be used for models of various materials and complicated castings. There are benefits that can be applied.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a two-station type automatic vibration molding machine according to the present invention.

FIG. 2 is a plan view of a two-station type automatic vibration molding machine according to the present invention.

FIG. 3 is a partial cross-sectional front view of a two-station type automatic vibration molding machine for a green mold according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration motor 2 Vibra head 3 Air spring means 4 Upper frame 5 Elevating means 5a Electric motor 5b Chain drive driving means 5c Elevating gripping part 6 Pressure plate 7 Roller chuck 8 Cast frame 9 Auxiliary frame 10 Model 11 Model table 12 Frame holder 13 Lower frame 14 Elevating table 15 Cylindrical guide 16 Table elevating means 17 Rotating fork 18 Air vibrator 19 Vibration table 20 Air spring 21 Fork rotation axis A Sanding station B Molding station

Claims (3)

[Claims] 1. A rotary fork 17 which is horizontally rotated about a vertical axis and on which a casting frame 8 can be installed at both ends thereof is provided. And a vibration table 19 which is joined to the model 10 on which the casting flask 8 is mounted and the model stand 11 at the sand-filling station A, and an air spring 2 which supports the vibration table 19 and vertically displaces it.
0, and the molding sand is filled with vibrations. In the molding station B, the vibrator head 2 provided with the vibration motor 1 for vibrating the pressure plate 6 is moved by air that expands and contracts in the vertical direction. Upper frame 4 by spring means 3
The vibra head 2 is pressed down from the uppermost position where the air spring means 3 is compressed to separate the pressure plate 6 from the casting frame 8, and the air spring means 3 is extended to press the molding sand in the casting flask 8. Elevating means 5 for raising and lowering to the lowering position is provided, and the molding sand of the casting flask 8 is vibrated by the vibrating motor 1 attached to the vibrator head 2 and the pressing force by the weight of the pressure plate 6 and the extension of the air spring means 3. A roller chuck 7 is provided to hang down from the upper frame 4 to hold the lower part of the molding flask 8 after the pressure molding, to carry out the molding to the outside, and to empty the space from the outside. Is closed so as to carry in and hold the casting flask 8, and at the time of pressure molding and the table lifting / lowering means 1.
6, the opening operation is performed when the casting flask 8 is moved up and down.
At the same time, a molding sand filling step using the vibration table 19 from below and a molding step of performing pressure molding while applying vibration to the pressure plate 6 above the casting frame 8 at the molding station B are simultaneously performed at different positions. Automatic vibratory molding machine for two-station type green mold. 2. An air vibrator 18 for vibrating the vibrating table 19 at the sand putting station A.
Is provided on a part of the lower frame 13 via an air spring 20. In the molding station B, the air spring means 3 is provided.
2. The two-station type automatic vibration molding machine according to claim 1, wherein a pair of the vibration motor 1 and the vibration motor 1 are provided so as to be out of phase with each other by 90 degrees. 3. The elevating means 5 of the vibra head 2 of the molding station B comprises an electric motor 5a, a chain driving means 5b driven by the electric motor 5a, and an elevating grip part 5c. The casting plate 8 is replaced with an empty casting frame 8, and at the lowered position, the pressure plate 6 descends more than the depth of being pushed into the molding sand. 3. The two-station type automatic vibration molding machine according to claim 1 or 2, wherein the automatic vibration molding machine is configured to be in a hanging state.