JP2750947B2 - Pressurizing and compression equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pressure-compression device for molding a sand mold only by a compression action.

(Prior Art and Problems) Conventionally, in order to form a sand mold without generating noise and vibration, a method of compressing molding sand in a casting frame with a squeeze plate is known.

However, when a mold is formed only by compression with a squeeze plate, only a narrow sand part between the model and the frame wall or a narrow pocket part provided on the model has a bad sand clogging and only a simple shape Could not be molded.

Conventionally, sand clogging has been improved by compressing molding sand with segment squeeze feet instead of squeeze plates, but in the case of squeeze with segment feet, squeeze by arranging segment feet corresponding to the full fillet opening As a result, the sand around the poorly clogged part will be tightened to some extent, and the tight sand will hinder the movement of the segment foot located corresponding to the badly clogged part, and sufficiently tighten that part There was a problem that could not be done.

In addition, since the position of the segment foot is fixed with respect to the model, it is not possible to press the optimum positions for various types of models, and there is a problem that the method cannot be applied to the mold making of a large variety of small production.

(Purpose) The present invention has been made in view of the above-described problems, and is a pressure-compressing apparatus for forming a mold by reliably filling a portion where sand clogging has conventionally been bad, in correspondence with various models and casting flasks. The purpose is to provide.

(Means for Solving the Problem) In order to achieve the above object, a pressurizing and compressing device of the present invention is characterized in that a frame having an opening larger than an opening of a flask in a central portion is provided on a model plate on which the flask is mounted. The movable table can be relatively moved in and out or fixedly disposed above, and the movable table is supported at the upper part of the frame so that the movable table can be controlled to stop at any position in the horizontal plane. An actuating rod which is vertically movable and which can control the pressing force and / or the descending position when descending, is provided with a detachable mechanism for a pressurizing foot at a lower end of the actuating rod, and the movement on the frame A plurality of pressure feet having different dimensions and shapes, which are detachably attached to the attachment / detachment mechanism, are arranged within a moving range of the table.

(Effect) By adopting the apparatus having the above-described configuration, the molding sand in a place where the sand clogging is bad in the casting flask is locally pressurized in advance with the optimal pressure foot, so that the sand is sufficiently clogged. Then, since the entire molding sand is pressurized and compressed, a mold with good sand clogging can be formed over the entire area.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

On the top of the model plate (1), a casting frame (2) and a filling frame (3)
Are mounted so as not to be displaced by guide pins (not shown), and a pressurizing and compressing device (P) is disposed above the casting frame (2) and the filling frame (3).

The pressurizing / compressing device (P) will now be described in detail. At a position slightly above the casting frame (2) and the filling frame (3), the central portion is located closer to the opening of the casting frame (2) and the filling frame (3). A flat frame (6) having a slightly large opening (5) is connected to a cylinder (not shown) and provided so as to be able to enter and exit above the casting frame (2) and the filling frame (3).

In FIG. 3, two lateral guide rods (8) and (8) are provided in parallel at the left and right ends of the frame (6) via bearings (7) and (7) in the front and rear upper part. The horizontal guide rods (8) and (8) include a horizontal slider (9).
(9) is slidably fitted and two front and rear guide rods (10) are provided between the horizontal sliders (9) and (9).
(10) is fixed in parallel at appropriate intervals on the left and right,
The horizontal sliders (9) and (9) are integrally connected.

The horizontal sliders (9) and (9) are connected to a servo cylinder or the like (not shown) and are configured to move to an arbitrary position in the left-right direction (X direction in FIG. 3) and stop.

The sliders (11) and (11) are slidably fitted to the two front and rear guide rods (10) and (10), and move between upper portions of the front and rear sliders (11) and (11). The table (12) is fixed and the front and rear sliders (11) (1
1) is integrally connected.

The front and rear sliders (11) and (11) are also connected to a servo cylinder or the like (not shown) so that the front and rear sliders (11) and (11) can be moved in the front and rear direction (Y direction in FIG.
Is moved to an arbitrary position and stopped.

A servo motor (13) is mounted on the moving table (12), and a driving sprocket (14) is fixed to a rotating shaft of the servo motor (13). On the other hand, a bracket (15) is provided upright on the side of the moving table (12) facing the servomotor (13) (see FIG. 2), and the driving sprocket ( A driven sprocket (16) corresponding to 14) is provided, and an endless chain (17) is wound between the sprockets (14) and (16). The endless chain (17)
Is connected to an upper end of an operating rod (19) via a connecting plate (18), and the operating rod (19) is fitted through a guide cylinder (20) provided on the moving table (12). Have been.

The servo motor (13) is driven by a driving sprocket (1
4) Rotating forward and reverse to raise and lower the operating rod (19) and control its rotational torque to change the downward force of the operating rod (19).
(26) The pressure applied to the casting sand (S) by (27) can be controlled, and in addition, the operating rod (19) can be stopped and supported at an arbitrary position.

The lower end of the operating rod (19) is located at the uppermost position above the frame (6), and at the lowermost position, penetrates the opening (5) so as to be inserted into the flask (2) as shown in FIG. It is provided in.

Further, the operating rod (19) is provided with an air hole (21) penetrating vertically, and the upper end of the air hole (21) communicates with a compressed air source via a flexible conduit and a valve (not shown). Have been.

Further, the lower end of the operating rod (19) is formed in a tapered stepped portion (22) (a spigot portion), and the stepped portion (2
2) A rubber member (24) having a hollow section (23) communicating with the ventilation hole (21) and having an outer diameter slightly smaller than the outer diameter of the stepped section (22) has a concave cross section. It is fixed in a shape.

That is, the lower end of the operating rod (19) is
The compressed air is supplied to the hollow portion (23) of the rubber member (24) to expand the rubber member (24), and the pressure foot (25) (26) (27) described later The mechanism is configured to be detachable.

Further, a hole (30) in which the stepped portion (22) of the rubber member (24) and the operating rod (19) can be inserted within the moving range of the moving table (12) on the frame (6). The pressing feet (25), (26), and (27) each having a proper position are placed at appropriate intervals so as not to cause positional displacement (FIG. 3), and each pressing foot (25) (26) (27) are prepared with different outer diameters. (FIG. 4) In the structure configured as described above, the pressurizing / compressing device (P) is moved from above the filling frame (3) to the side by operating a cylinder (not shown) in the state shown in FIGS. Move.

Next, after moving a sand supply device (not shown) above the filling frame (3), the sand supply device sets the space defined by the model plate (1), the casting frame (2), and the filling frame (3). A fixed amount of casting sand (S) is supplied. At this time, the supply amount of the casting sand (S) is lower than the upper surface of the filling frame (3), and does not overflow from the upper portion of the filling frame (3) and spill outside.

Next, the sand supply device (not shown) is moved to the side of the casting frame (2) and the filling frame (3), and the pressurizing and compressing device (P) is moved above the casting frame (2) and the filling frame (3). 1 to 3
The state is as shown in the figure.

Next, the servo cylinders (not shown) of the front and rear sliders (11) and (11) are operated to move the operating rod (19) together with the moving table (12) to a position immediately above the hole (30) of the pressing foot (25). Stop.

Next, the servo motor (13) operates and the operating rod (19)
Down to insert the rubber member (24) and the stepped portion (22) into the hole (30) of the pressure foot (25), and the step of the stepped portion (22) engages the pressure foot (25). The descent is stopped by contacting the upper end.

Next, compressed air is supplied to the hollow portion (23) of the rubber member (24) through a flexible conduit (not shown) and a ventilation hole (21) to expand the rubber member (24), thereby causing the rubber member (24) to expand. Is pressed against the inner surface of the hole (30), and the frictional force connects and holds the pressure foot (25) to the operating rod (19).
Pressing foot (25) is raised together with the operating rod (19) to the rising end by the reverse operation of the servo motor (13).

Next, the servo cylinders (not shown) of the horizontal sliders (9) and (9) and the servo cylinders (not shown) of the front and rear sliders (11) and (11) operate by a pre-programmed distance to move the moving table (12) and apply pressure. Connect the foot (25) to the pocket (a) or the sandy part (a,
Servo motor (13) after stopping at the position corresponding to b)
Actuates to pressurized foot (25) to pre-programmed pressure and / or pre-programmed lowering position
Is pressurized and lowered, and the molding sand (S) in that portion is pressurized and compressed to obtain the state shown in FIG.

Next, the servo motor (13) operates in reverse to pressurize the foot (2
5) After returning to the original position, the two servo cylinders (not shown) and the servomotor (13) are operated in accordance with the previously programmed values in the same manner as the above operation, and the pocket portion (a) or the sanded portion is operated. (A, b) Foundry sand (S)
Are sequentially compressed under pressure by the pressure foot (25).

When the compression by the pressure foot (25) is completed in this way, the servo motor (13) operates in reverse, and the pressure foot (25)
After returning to the original position, two servo cylinders (not shown) are operated to move the pressing foot (25) together with the moving table (12) so that the pressing foot (25) shown in FIG. The servo motor (13) is operated to move the pressurizing foot (25) back to the original position on the frame (6) by returning to the position immediately above the position where it was placed, and the compression in the rubber member (24) is performed. The air is exhausted, and the connection between the rubber member (24) and the pressure foot (25) is released.

Next, the servo motor (13) operates and the operating rod (19)
Then, two servo cylinders (not shown) are operated to move the operating rod (19) to a position immediately above the next pressurizing foot (26).

After pressing the sand portion (n) with the pressing foot (26) in the same manner as the pressing and compressing of the pocket portion (a) and the sand portion (a, b) by the pressing foot (25), In the same manner, the sanded portion (c) is pressed and compressed by the pressing foot (27).

In this way, all pockets with poor sand clogging are pressed and compressed by pressing feet (25), (26) and (27), but are optimal for each due to differences in the dimensions of pockets and sanding parts. Pressurized and compressed by the appropriate pressurizing foot.

When all the molding sand (S) in the portion where the sand clogging is bad is pressurized and compressed in this way, the moving table (12) is moved by operating two servo cylinders (not shown) to move the pressurizing foot (27). The position is moved to the center position of the opening (5), and the servomotor (13) is operated to move the pressing foot (27) to the pre-programmed lowering position (casting sand (S)
(The position where the pressure foot (27) is slightly inserted into the inside).

Next, the two servo cylinders (not shown) move the pressing foot (27) according to a pre-programmed sequence in FIG.
Move the casting sand (S) around the frame walls of the casting frame (2) and the filling frame (3) where sand clogging is poor by moving in the XY direction, and make the upper surface of the sand concave as shown in FIG. The pressure foot (27) allows the pressure compression described below to be performed effectively.

When sand leveling by the pressure foot (27) is completed in this way, the pressure foot (27) is raised and two servo cylinders (not shown) and the servomotor (13) are operated to move the frame in a previously programmed order. Movement and stop are sequentially repeated over the entire inner region, and the top surface of the molding sand (S) is pressed at each stop position with a pre-programmed pressing force, and finally the entire inner region of the casting flask (2) is pressurized and compressed.

Next, after the pressure foot (27) is returned to a predetermined position on the frame (6), the casting frame (3) is removed, and the casting frame (2) and the model plate (1) are die-cut. Finalize.

The above operation is repeated to form a mold.

In the above embodiment, the compression molding of the entire molding sand was performed by the compression foot (27). After the sand leveling, the moving table (12) was moved to the position shown in FIGS. The squeeze plate (4) provided may be used.

Further, the lifting mechanism of the operating rod (19) may be changed to another lifting mechanism such as a lifting mechanism using a servo motor and a ball screw, or a lifting mechanism using a pinion and a rack bar rotated by the servo motor.

Further, in the embodiment, the attachment / detachment mechanism of the pressurizing foot uses a rubber member which expands by the supply of compressed air, but may be another attachment / detachment mechanism such as one using a tapered hole and a tapered protrusion or one using a clamp melon.

In the embodiment, sand leveling is performed by the pressing foot (27), but a leveling foot having a shape suitable for sand leveling is arranged in the same manner as the pressing feet (25), (26), and (27). Sand leveling may be performed from this.

Further, the number of the pressing feet may be increased or decreased according to the mold to be molded.

In the above embodiment, the frame (6) is connected to the opening (5).
However, the two parallel horizontal guide rods (8) and (8) are connected at both ends by connecting plates, and the horizontal guide rods (8) and (8) are connected to the horizontal sliders (9) and (8). 9) (hereinafter, the same configuration as the embodiment) may be fitted.

The sand leveling may be performed before the pressing and compression by the pressing feet (25), (26), (27), or the sand leveling may not be performed at all depending on the mold.

Further, the molding sand may be supplied from the opening (5) in the state shown in FIGS.

Alternatively, the filling frame (3) may be eliminated and only the deep casting frame may be used.

(Effects) As is apparent from the above description, the present invention is a device that can locally press and compress molding sand located at a position where sand clogging is poor with a pressing foot having an optimum shape and size for each of them. It can surely and uniformly fill molding sand with various mold plates and casting frames with badly clogged parts and mold molds. It is.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional front view, FIG. 2 is a vertical sectional side view, FIG. 3 is a view taken along the line AA in FIG. 1, and FIG. 1 is an enlarged view taken along the arrow BB in FIG. 1, FIG. 5 is an enlarged view showing a connection state between the operating rod and the pressure foot, and FIGS. 6 and 7 are longitudinal front views showing a pressure state by the pressure foot. FIG. 8 is a vertical sectional side view showing a sand leveling state, and FIG. 9 is a vertical sectional side view showing a pressing state of the entire molding sand. (1): Model plate, (2): Cast frame (3): Fill frame, (12): Moving table (19): Working rod, (24): Rubber member (25) (26) (27): Addition Pressure foot

Claims (1)

(57) [Claims] 1. A frame having an opening larger than an opening of a flask in a central portion is relatively fixed to a model plate on which the flask is placed, and can be moved in and out of the frame, and is moved to an upper portion of the frame. The table is supported at any position in a horizontal plane so as to be controllable to stop and stop.
Alternatively, an operating rod with a controllable lowering position is provided,
A pressure foot attachment / detachment mechanism is provided at the lower end of the operating rod,
A pressurizing and compressing device, wherein a plurality of pressurizing feet of different dimensions and detachable from the mounting and dismounting mechanism are arranged within a moving range of the moving table on the frame.