JPS6239875Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a die-cutting device for cutting out and separating a mold from a model during mold manufacturing.

The casting process, in which molten metal is injected into a mold and solidified to produce a solid metal in the shape of the mold, requires a mold-making operation. Mold making involves making a sand mold or other mold using a model, and the mold must be cut out from the model.

Die cutting has conventionally been carried out using a die cutting apparatus shown in FIGS. 1 and 2. As shown in the figure, on a molding machine 1, a model 2 which has been integrated through a molding operation and a casting flask 3 filled with sand or the like to form a mold are stacked. A die cutting device 4 is mounted on the molding machine 1, and the die cutting device 4 is equipped with four guide rods 5 that are vertically movable. An arm-shaped frame 6 is integrally attached to each of the two guide rods 5 on the left and right, and a hydraulic cylinder 7 is attached to each arm-shaped frame 6 as shown in FIG.
can be raised and lowered. As shown in FIG. 3, which is an enlarged view of part B in FIG. 10~ immediately after the model 2 and flask 3 are separated from each other after coming into contact with
Arm-shaped frame 6 for the prescribed stroke of 20 mm
moves at low speed. Thereafter, the arm-shaped frame 6 rises at high speed and stops without impact. In this way, the mold 9 and the model 2 in the flask 3 are separated. The mold 9 and flask 3 that have been cut out as described above run on rollers 8 and are transported by a transport device (not shown).

However, conventional die cutting devices have the following drawbacks. Since the flask is directly supported by rotatable rollers, there is a risk that the mold may roll and come into contact with the model during die cutting, causing damage. Since the quality of the mold depends on the state of support of the flask while it is being raised, it is essential to maintain accuracy at the roller level, and regular maintenance work is required. Furthermore, sand and the like fall onto the roller during the molding operation before die cutting, making it impossible to maintain the above-mentioned accuracy. Furthermore, since the flask runs on the rollers, the rollers wear out, and the roller level adjustment screw 1 is used to compensate for this wear.
0 is provided, but its mounting position is at the bottom of the arm-shaped frame 6, making it difficult to make periodic adjustments.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate such drawbacks and to provide a die cutting device that can accurately cut out molds without damaging them.

The structure of the present invention to achieve this purpose is as follows:
A mold removal device that separates a model from a mold-incorporated flask by raising the mold-incorporated flask, and a locking mechanism capable of locking a piston at any position in a lifting member that can be raised and lowered. It is characterized by comprising a plurality of support members whose abutment surfaces move from bottom to top via attached cylinders to support the lower surface of the flask, and all of the support members are in contact with the lower surface of the flask. do.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. Note that this embodiment is a partial improvement of the conventional die-cutting apparatus described above, so the same parts are given the same reference numerals, and only the different parts will be explained.

This embodiment is shown in FIG. 4, which corresponds to FIG. A stay 11 is provided under the arm-shaped frame 6 which can be raised and lowered.
and 12 are bolted together, and an L-shaped arm 13 is rotatably attached to the stay 11 as a support member. Further, a cylinder with a locking mechanism (hereinafter simply referred to as a cylinder) 14 is rotatably attached to the stay 12, and the tip of a rod 15 of the cylinder 14 is rotatably connected to the base end of the arm 13. . With this structure, by pushing out the rod 15, the arm 13
rotates, and the contact surface 16 at the tip of the arm 13 moves from bottom to top to support the bottom surface 17 of the flask 3.
The structure of the locking cylinder 14 is shown in FIG. A piston 18 is provided in the cylinder 14, and the rod 15 is connected to the piston 18. When pressure oil is supplied to the push side port 19, the rod 15 moves to the right in FIG. If you supply it to , it will move to the left. A lock portion 21 is provided on the right side in FIG. This is because the lock sleeve 22, which covers the outside of the rod 15 and has a groove for introducing pressure oil inside, locks the rod 15 with its own elastic force.
The rod 15 is locked by tightening. An unlock port 33 is provided to supply pressure oil between the rod 15 and the lock sleeve 22, and if pressure oil is not supplied, the rod 15 will be tightened by the lock sleeve 22 as shown in Figure 6a. Locked. When pressure oil is supplied, the lock sleeve 22 bulges as shown in FIG. 6b, and the rod 15 can move freely within the lock sleeve 22. Arm 13 as above
Two pairs of cylinders 14 and 14 are provided on each of the left and right arm-shaped frames 6, and the flask 3 is supported at four locations.

Next, the operation of such a die cutting device will be explained. After the molding operation is completed, pressure oil is supplied to the unlock port 23 in response to a signal that a squeeze head (not shown) has been raised, and after the rod 15 is opened, pressure oil is also supplied to the push side port 19. Then, the arm 13 rotates clockwise as shown in FIG.
comes into contact. At this time, pressure oil of the same pressure is supplied to the four cylinders 14 that move each arm 13, and the four arms 13 apply a predetermined force to the bottom surface of the flask 3 from below without lifting the flask 3. Press 17. In this way, with the arm 13 pressing the lower surface 17 of the flask 3 with a predetermined pressure, the supply of pressure oil to the unlock port 23 is stopped and the rod 15 is locked, and the supply of pressure oil to the press port 19 is also stopped. stop. As described above, each of the four arms 13 presses the lower surface 17 of the flask 3 from below with a predetermined force, so that the contact surfaces 16 of the four arms 13 all come into contact with the lower surface of the flask 3. Even if the lower surface 17 of the flask 3 is uneven or sand is caught between the lower surface 17 and the contact surface 16, the lower surface 17 of the flask 3 is pressed with the same pressure at all four locations. In this way arm 13
When the roller 8 is holding the flask 3, the roller 8 is not in contact with the flask 3, and in this state, the arm-shaped frame 6 is raised in the same way as in a conventional die cutting device. When the arm-shaped frame 6 reaches the rising end and stops, pressure oil is supplied to the unlock port 23 to release the lock of the rod 15, and then pressure oil is supplied from the pull side port 20. Then, as shown in FIG. 4, the arm 13 rotates to the left, the contact surface 16 separates from the lower surface 17 of the flask 3, and the flask 3 descends and is placed on the roller 8. The flask 3 then runs on rollers 8 and is transported by a transport device (not shown).

Here, the control circuit of the locking mechanism cylinder 14 will be explained based on FIG. 7. In the figure, 24 is a die-cutting device according to the present invention, and 25 is a pump to which pressurized oil is sent at a constant pressure as shown by the arrow. The pump 25 is connected to the unlock port 23 via a check valve 26 and a solenoid valve 27. When the solenoid valve 27 is energized, pressure oil is supplied to the unlock port 23 and the rod 1 of the cylinder 14 is
5 is in an open state. The push side port 19 and the pull side port 20 are connected to a pump 25 or a drain 29 via a solenoid valve 28, and a pressure switch 30 connected to an unlock port 23 controls the hydraulic pressure in the lock portion 21 of the cylinder 14 to a predetermined pressure. After confirming that this is the case, when the solenoid valve 28 is energized to "(a) push rod", the pressure oil from the pump 25 passes through the solenoid valve 28, enters the push side port 19, and presses the piston 18. Then, the rod 15 is pushed out, and the pressure oil on the opposite push side port 19 is pushed out from the pull side port 20 by the piston 18, and the pressure oil coming out of the pull side port 20 is passed through the solenoid valve 28.
through which it flows to drain 29. A pressure reducing valve 31 is provided between the push side port 19 and the solenoid valve 28, and the pressure for pushing out the rod 15 is automatically adjusted. As mentioned above, when the rod 15 is pushed out and the contact surface 16 of the arm 13 comes into contact with the lower surface 17 of the flask 3, the pressure of the pressurized oil increases, and the pressure switch 32 connected to the push side port 19 detects this pressure. Then, the solenoid valve 27 is demagnetized as a signal indicating the completion of the "rod push". Then, the supply of pressure oil to the unlock port 23 is stopped, residual oil flows to the drain 29, and the rod 15 is locked with the contact surface 16 of the arm 13 in contact with the lower surface 17 of the flask 3. There is no change in the oil pressure while the arm-like frame 6 is rising. After the arm-shaped frame 6 reaches the rising end, the solenoid valve 27
is energized to open the rod 15 as described above, and after confirming that the pressure switch 30 indicates a predetermined pressure, the solenoid valve 28 is energized so that it becomes ``(b) rod pulled''. Then, contrary to what was mentioned above,
Pressure oil from the pump 25 enters the pull side port 20 of the cylinder 14 and causes the rod 15 to be drawn in, and pressure oil pushed out from the push side port 19 flows to the drain 29. After confirming that the arm 13 is completely separated from the flask 3 using a limit switch (not shown) or the like, the solenoid valves 27 and 28 are demagnetized. Note that 32 is a pressure reducing valve provided for the purpose of controlling the maximum hydraulic pressure to protect the entire control circuit, and the relief valve 26 is designed to prevent the hydraulic pressure of the pressure oil releasing the lock of the rod 15 while the arm 13 is rotating. It is provided to prevent it from dropping.

In this example, a rotatable arm is shown as a support member, but a support member that can move up and down may be used as long as the contact surface moves from the bottom to the top and supports the bottom surface of the casting flask. good.

As described above in conjunction with the drawings, according to the present invention, the elevating member that can be raised and lowered is provided with a plurality of support members that support the bottom surface of the casting flask via a cylinder with a locking mechanism. The flask can be held in contact with the bottom surface of the flask,
As a result, the following effects are obtained. Unlike when placed on rollers, the flask does not roll horizontally and there is no risk of damage to the mold. Even if the flask or the contact surface of the support member that comes into contact with the flask wears out, or if foreign matter gets caught between the support member and the flask,
There is no gap between the flask and the support member, and the highest mold cutting accuracy can be maintained at all times. In addition, even if there is wear on the contact surface of the supporting member or the casting flask, there is no effect on the precision of the mold removal process, so there is no need for these correction machining processes, reducing maintenance costs for the mold removal equipment. do.

[Brief explanation of drawings]

Figure 1 is a front view of a conventional die-cutting device, Figures 2 and 3 are views taken in the direction of arrow A in Figure 1, and an enlarged view of section B, respectively, and Figures 4 to 7 are die-cutters according to the present invention. Regarding the embodiment of the device, Fig. 4 is a partially enlarged view corresponding to Fig. 3, Fig. 5 is a structural diagram of a cylinder with a locking mechanism, Figs. FIG. 7 is a control circuit diagram. In the drawings, 2 is a model, 3 is a flask, 5 is a guide rod, 6 is an arm-shaped frame, 9 is a mold, 13 is an arm, 14 is a cylinder with a locking mechanism, 15 is a rod, 16 is a contact surface, and 17 is a mold. The lower surface of the frame, 24, is a die cutting device.

Claims (1)

[Scope of utility model registration request] A mold removal device that separates a model from a mold-incorporated flask by raising the mold-incorporated flask, and a locking mechanism capable of locking a piston at any position in a lifting member that can be raised and lowered. It is characterized by comprising a plurality of support members whose abutment surfaces move from bottom to top via attached cylinders to support the lower surface of the flask, and all of the support members are in contact with the lower surface of the flask. die-cutting device.