JPS62763B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vacuum molding apparatus.

Generally, a suction box for suctioning the film is integrally attached to the pattern plate for vacuum mold making, which poses a problem of increased production costs in foundries that produce a wide variety of products in small quantities. In addition, when replacing a pattern plate, it takes time to transport a large pattern plate with a suction box attached thereto, or to attach and detach a suction hose, resulting in a decrease in productivity.

The present invention aims to solve these problems. The configuration of the present invention will be explained below based on examples.

Reference numeral 1 denotes a frame body having a vertically penetrating hollow part 1a with a slightly smaller diameter at the upper end, and the frame body 1 has flange parts 1b and 1c protruding from the inner and outer peripheries at the upper end position, and an outer periphery flange part 1c. A reinforcing rib 1d is inserted between the frame body 1 and the outer wall surface of the frame body 1.
Fixing pins 2 are respectively pivotally supported on the side wall surfaces of the reinforcing ribs 1b provided on the opposite side walls of the frame, and an actuating arm 3 is rotatably supported at the center of each fixing pin 2 and is actuated. A movable pin 6 is connected to one end of the arm 3 via a pin 4 and a link 5.
The movable pin 6 is slidably inserted into a guide portion 7 attached to the side wall surface of the frame 1.
Further, the lower part of the hollow part 1a has a recess 8a on the side surface into which the movable pin 6 can fit in and out, and a seal member 9 that can come into airtight contact with the lower surface of the frame 1 on the outer periphery of the lower surface. A bottom plate 8 provided protruding from the
are provided so that they can be fitted. Also, this bottom plate 8
A model plate 10 consisting of a model part 10a and a model stand 10b is placed on the upper surface, and its outer width is set to a size that allows it to come into contact with the lower surface of the inner peripheral flange part 1b. The plate 10 has a decompression chamber 10c partitioned into a lattice shape with reinforcing material on the lower surface, a plurality of ventilation holes (not shown) communicating with the atmosphere on the upper surface, and a communication hole leading to the outside on the side surface. It has a configuration in which an opening (not shown) is provided.
Further, a suction port 11 communicating with the hollow portion 1a is bored in the side wall surface of the frame 1, and when a vacuum pump (not shown) connected to the suction port 11 is operated, the suction port 11 is opened. Negative pressure is applied to the upper surface of the model board 10 through the portion 1a, the communication port (not shown), the decompression chamber 10a, and the vent hole (not shown). 12 as shown in FIGS. 4 and 5,
A lifting cylinder mounted upward on the frame 13, the piston rod 12a of the lifting cylinder 12
The tip has a bottom plate 8, a model plate 10 and a frame 1 on the top surface.
An elevating table 14 is fixed thereto, and is movable up and down.

Further, above the lifting table 14, a pair of clamp arms 15 whose base ends are pivotally supported are provided so as to be openable and closable by a drive device (not shown), and on the side of the lifting table 14, a pattern model A roller conveyor 16 for board replacement is extended. To explain the case of pattern exchange in a device configured in this way,
As shown in FIG. 4, with the old model board etc. placed on the upper surface of the lifting table 14, the lifting cylinder
2 to raise the lifting table 14 to a position slightly above the upper surface of the hook portion 15a of the clamp arm 15, close the clamp arm 15, and then lower the lifting table 14 to raise the other end of the actuating arm 3. When the clamp arm 15 is stopped with the clamp arm 3a in contact with the upper surface of the hook portion 15a, the movable pin 6 is disengaged from the recess 8a and the engagement between the frame 1 and the bottom plate 8 is released, as shown in FIG. It will be destroyed.
Thereafter, when the lifting cylinder 12 is lowered to lower the lifting table 14, the frame 1 remains on the upper surface of the hook portion 15a of the clamp arm 15, while the model plate 10 and the bottom plate 8 are placed on the upper surface of the lifting table 14. and descend to the original position (see Figure 5).
Thereafter, the old model plate 10 on the top surface of the lifting table 14 is removed from the bottom plate 8 and moved outward on the roller conveyor 16, and a new model plate is attached to the top surface of the bottom plate 8. After that, the lifting cylinder 12 again
to lift the lifting table 14,
A new model plate and bottom plate 8 are fitted into the hollow part 1a of the frame 1, and the outer periphery of the upper surface of the model plate is brought into contact with the lower surface of the inner peripheral flange part 1b of the frame 1, and the frame 1 is replaced with the model plate and the bottom plate 8. When the actuating arm 3 is lifted slightly upward at the same time, the rear surface 3b of the distal end side of the actuating arm 3 is slid against the distal end of the hook portion 15a of the clamp arm 15, and the movable pin 6 moves inward and is fitted into the recess 8a of the bottom plate 8 to close the frame. The body 1 and the bottom plate 8 are integrally engaged to form a vacuum molding suction box composed of the frame 1 and the bottom plate 8. Further, the gap between the frame 1 and the outer peripheral surface of the bottom plate 8 is sealed with a sheet material 9 (see FIGS. 1 and 2). Therefore, when the lifting cylinder 12 is lowered at the same time as the clamp arm 15 is opened, the frame 1
The model plate and the bottom plate 8 are integrally engaged with each other and lowered together with the lifting table 14 to the original position, and then the new model plate on the upper surface of the lifting table 14 is moved to the molding position together with the frame 1 and the bottom plate 8. The molding operation is then performed. Thereafter, the above operation is repeated every time the pattern is exchanged. Incidentally, the movable pin 17 may be constructed as shown in FIG. 6 so that the movable pin 17 can be moved into and out of the recessed portion of the bottom plate 18 by manually or mechanically operating the movable pin 17. In addition, 19 is a frame body, and 20 is a compression spring.

In short, the vacuum molding apparatus was constructed by combining a frame with a suction port, a model plate defining a vacuum chamber, and a bottom plate with a sealing member, so if you want to replace the model plate, you can Since only the plate needs to be replaced and there is no need to replace the entire suction box as in the past, the manufacturing cost of the model plate is reduced, making it ideal for foundries that produce a wide variety of products in small quantities. Since there is no need to replace the entire suction box, transportation work becomes easier, and the work of attaching and detaching the suction hose is eliminated, which helps improve productivity.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of section A in Fig. 1, Figs. 3 to 5 are operating state diagrams, and Fig. 6 is another embodiment of the invention. FIG. 1, 19: frame body, 1a: hollow part, 6, 17: movable pin, 8, 18: bottom plate, 8a: recessed part, 9: sealing member. 10: Model board.

Claims (1)

[Claims] 1 It has a vertically penetrating hollow part 1a whose upper end is configured with a flange part 1b to have a slightly smaller diameter, and a movable pin 6 that can move in and out toward the hollow part 1a is provided on the opposite side wall at the lower position, and the side wall is provided with the a frame 1 provided with a suction port 11 penetrating the hollow portion 1a;
A model board 10 is inserted into the center part 1a of the frame 1, the upper surface of which engages with the lower surface of the flange part 1b, and a decompression chamber 10c is defined on the lower surface, and the model board 10 is placed thereon. A sealing member 9 that is inserted into the hollow portion 1a and has a recess 8a in which the movable pin 6 can be fitted at a position corresponding to the movable pin 6, and can abut the lower surface of the frame 1 in an airtight manner on the outer periphery of the lower surface. A vacuum molding device comprising: a bottom plate 8 provided with a bottom plate 8 projecting outward;