JPS61180645A - Holding device of die used for shaping mold - Google Patents

Abstract

PURPOSE:To obtain a holding device easy to exchange dies by vertically moving an upper die by an upper-die vertically-moving unit in a state of fixing a lower die onto a mounting table by a lower-die vertically moving unit, as to the holding device of a die used for shaping a mold core. CONSTITUTION:After setting upper and lower dies (a), (b) together on a mounting table 7 of holding device 3; units 20, 30 for vertically moving the lower and upper dies (a), (b) are lowered respectively to fix the die (b) onto the table 7 by claws 26a... and press the die (a) against the die (b) by a presser 31. A blow molding of molding sand is performed in this state. In case of exchanging the dies (a), (b), the unit 30 rises while suspending the die (a), and the unit 20 rises successively to take off the presser 31 and a hook 32, thereby carrying out the dies (a), (b). In this way, the holding device of the die used for shaping a mold, easy to exchange the dies is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a support device for a mold for mold making used when molding a mold such as a core.

(Prior art) For example, the blowing method used for molding shell molds for casting automobile parts generally involves injecting resin into a cavity formed in the mating part of a mold making mold consisting of an upper mold and a lower mold. A mold is manufactured by blowing coated molding sand and then heating and hardening it. In this method, a lower mold is used as a means to support the lower mold and the upper mold so that they can be separated from each other. A support device is used that has a mounting table for fixing the mold and a lifting unit that can be raised and lowered for holding the upper mold. Then, with the lower mold fixed on the mounting table, the upper mold is raised and lowered by the lifting unit, thereby repeatedly closing and opening both molds.

However, when performing the above-mentioned work, the conventional support device is configured to fix the upper mold and the lower mold to the lifting unit and the mounting table using a plurality of bolts, respectively. Therefore, if it becomes necessary to replace both the upper and lower molds as a set, for example when molding different types of molds, remove each bolt that fixes each mold in a predetermined position each time, Furthermore, the troublesome work of reattachment is required, and therefore, this type of mold replacement requires a great deal of time and effort.

(Object of the Invention) The present invention addresses the above-mentioned problems regarding a support device for a mold making tool used in a mold making operation.
The purpose of the present invention is to significantly improve work efficiency without increasing costs by realizing a support device that is low cost and allows for easy replacement of molds.

(Structure of the Invention) That is, the support device according to the present invention includes a lower mold lifting unit and an upper mold lifting unit that can be raised and lowered, and the lower mold lifting unit clamps the lower mold at its lowered position. A clamp claw that fixes the lower mold on the mounting table and a transfer roller that supports the lower mold so that it can be lifted and transferred in the raised position are integrally provided. The present invention is characterized in that an upper mold presser for pressing and a hook for holding the upper mold in a suspended state in the raised position are integrally provided, and further, a control device is provided for controlling the raising and lowering of these lifting units. During normal work, the control device functions to close and open the mold by raising and lowering the upper mold elevating unit, and when replacing the mold, it operates the upper mold presser and the mold with the lower mold elevating unit raised. The hook acts to hold the upper die lifting unit in an intermediate position so that it is released from the upper die.

According to this configuration, by raising and lowering the upper mold with the upper mold elevating unit while the lower mold is fixed on the mounting table with the lower mold elevating unit, both of the above-mentioned molds can be moved without using mold fixing bolts. The mold can be opened and closed between predetermined positions on the support device, and when replacing the mold, the clamping action for both molds is released and the lower mold is moved to the transfer position with the upper mold resting on the lower mold. It becomes possible to transportably support it on a rack.

(Effects of the Invention) According to the above configuration, the mold opening/closing operation can be performed without fixing the mold making mold to the support device using bolts, and when replacing the mold, the transfer roller is used. Since the mold can be supported on the mold in a transferable manner, there is no need to attach or remove bolts that are required when replacing the mold. This makes it possible to replace molds in milliseconds at low cost during mold making work, and greatly improves the efficiency of this type of mold replacement work.

(Example) Embodiments of the present invention will be described below based on the drawings.

First, the overall configuration of a mold making machine to which the support device according to the present invention is applied will be briefly explained based on FIG. a support device 3 for supporting an upper mold a and a lower mold; both molds a;
a blowing device 4 that is arranged in the main frame 2 so as to be able to reciprocate with respect to b and supplies molding sand into a cavity formed at the joining part of both molds a and b when the molds are closed;
and an unloader 5 for taking out the mold formed by the mold. Each of the above-mentioned devices 3.4 is supplied with air from an air supply source 6 provided below the main frame 2.
．． By driving the molds 5, predetermined operations such as opening and closing of the molds a and b, blowing molding sand into them, and taking out the mold after molding are sequentially and repeatedly carried out.

Next, the support device 3 will be explained in detail.

As shown in FIGS. 2 to 4, the support device 3 includes a mounting table 7 on which the lower mold is placed, a lower mold elevating unit 20 that is provided to be able to rise and lower with respect to the mounting table 7, and a lower mold An upper mold lifting unit 30 is provided above the lifting unit 20 so as to be able to move up and down. Here, in this embodiment, two sets of molds a and b can be set on the support device 3, and each lower mold is provided with a mold after molding, although not shown. A plurality of eject bins are provided for separation from the mold. Also,
The mounting table 7 is divided along the longitudinal direction at a predetermined distance, so that it is not attached to the mold separation eject bin that protrudes downward from the lower mold when the lower mold is set. The mounting table 7 is designed not to interfere. Further, below the cough mounting table 7, eject devices 8, 8 are arranged corresponding to the set positions of the respective lower molds.

These eject devices @8, 8 each have a structure in which an eject plate 11 is connected above an eject air cylinder 10 attached to a fixed frame 9, and when the mold is taken out from the lower mold, the plate 11 is connected to the cylinder 10. The lower mold is driven upward by the lower mold to project the eject bin in the lower mold toward the cavity of the lower mold, thereby separating the lower mold from the mold. Here, the eject device 8 is provided with guide portions 12 and 12 for guiding the eject plate 11 up and down, respectively.

Further, the lower die lifting unit 20 includes two frames 21 and 21 arranged in parallel to the longitudinal direction of the mounting table 7,
Each frame 21.21 has a plate 22.22 connecting both ends to each other. Piston rods 23a and 2 of two lifting air cylinders 23.23 are fixed to both sides of the mounting table 7 via brackets 13.13, respectively.
3a are connected to the plates 21 and 21, respectively.

However, on the upper surfaces of both frames 21 and 21 in this lower die lifting unit 20, there are a plurality of roller mounting members 24...
24 are arranged side by side in an upright manner, and transfer rollers 25...25 are respectively attached at predetermined positions. These rollers 25...25 are located below the mounting table 7 as shown in the figure when the lower die lifting unit 20 is in the lowered position, but when the unit 20 is raised, they protrude above the mounting table 7. ing.

In addition, each of the roller mounting members 24, 24, excluding the roller mounting members 24, 24 at both ends, has a clamp claw 26 at the top.
Clamp members 26 . . . 26 having 26 a . b1 is clamped and fixed on the mounting table 7. Here, on the mounting table 7, the roller mounting members 24...24 or the clamp members 26...
In order to avoid interference with 26, a plurality of notches 7a...-7
a is formed, and in the clamp members 26...26, the distance between the clamp claws 26a...26a and the transfer rollers 25...25 is equal to the flange portion t of the lower mold.
It is set to be larger than the dimensions of z and bt in the height direction.

On the other hand, the upper mold elevating unit 30 includes an upper mold holder 31 that presses the upper mold a against the lower mold in its lowered position, and an upper mold holder 31 that is attached to the upper mold holder 31 and holds the upper mold a in a suspended state in its raised position. It has a plurality of hooks 32 . Air cylinder for lifting. The holder 33 is attached to a bracket 34 fixed to the upper front surface of the main frame 2, and
A piston rod 33a is fitted downwardly so as to be freely retractable. Since the upper mold holder 31 is connected to the tip of the piston rod 33a via the pin joint 35, the upper mold a can be smoothly aligned with the lower mold when the upper mold holder 31 is lowered. It is configured so that it can be done.

Further, two guide rods 36.36 are erected on both sides of the upper surface of the upper die presser 31, and the rods 36.36 are slidable in guide tubes 37.37 fixed to the bracket 34, respectively. The upper mold presser 31 is guided in the vertical direction by being fitted.

Furthermore, this support device 3 is equipped with a control device 40 that controls the operation of each of the lifting air cylinders 23, 23 and 33 of the lower mold lifting unit 20 and the upper mold lifting unit 30, as shown in FIG. ing. The control device 40 includes an upper mold switching valve 43 and a lower mold switching valve 44 to which a supply passage 41 from the air supply source 6 and a drain passage 42 communicating with the atmosphere are connected, respectively, and the upper mold switching valve. 43 to the lower working chamber 33b and upper working chamber 33c of the lifting air cylinder 33 of the upper die lifting unit 30, respectively.
．． The second supply/discharge passage 45.46, the lower working chambers 23b, 23b and the upper working chamber 23c in the lifting air cylinder 23.23 of the lower mold lifting unit 20, which are led from the lower mold switching valve 44.

23c respectively. It has a fourth supply/discharge passage 47,48. The upper die switching valve 43 includes the supply passage 41, the drain passage 42, and the first. A neutral position 43a that blocks off the second supply and discharge passages 45 and 46, and a neutral position 43a that communicates the supply passage 41 with the first supply and discharge passage 45 and connects the second supply and discharge passage 46 with the drain passage 4
2, and the supply passage 41 is connected to the second
A lowered position 43C is provided which communicates with the supply/discharge passage 46 and communicates the first supply/discharge passage 45 with the drain passage 42, and takes the above-mentioned raised position 43b when the first solenoid 43d is activated, and when the second solenoid 43e is activated. , above descending position @4
It is designed to take 3C. Further, the lower die switching valve 44 has a raised position 44a that communicates the supply passage 41 with the third supply/discharge passage 47 and a fourth supply/discharge passage 48 with the drain passage 42, and a raised position 44a that communicates the supply passage 41 with the third supply/discharge passage 47 and the fourth supply/discharge passage 48 with the drain passage 42; A lowered position 44b that communicates with the supply/discharge passage 48 and communicates the third supply/discharge passage 47 with the drain passage 42 is provided, and the third solenoid 44
When the fourth solenoid 44d is activated, the raised position 44a is taken, and when the fourth solenoid 44d is activated, the lowered position 44b is taken. Here, the first to fourth supply and discharge passages 45 to 48
One-way check valves 49...49 are provided at the top, respectively.

In addition to the above configuration, this control device 40 has the air cylinder 33 for lifting/lowering in the upper die lifting unit 30 detecting the lowering position and the rising position of the piston rod 33a, respectively, and neutralizing the upper die switching valve 43. The first one is to take position 43a. A second limit switch 50.51 and an intermediate limit switch 52 which detects the intermediate position of the piston rod 33a and causes the upper mold changeover valve 43 to take the neutral position 1f43a during mold exchange are provided. In addition, the lower mold above
1. The lifting air cylinders 23 and 23 of the lifting unit 20 each have a third cylinder for detecting the lower position and the upper position of the piston rod 23a. 4th limit switch 5
3.53 and 54.54 are provided.

Next, the operation of the above embodiment will be explained.

First, the upper mold a and the lower mold are set together in a predetermined position on the mounting table 7 of the support device 3, and then the lower mold elevating unit 20 and the upper mold elevating unit 30 are lowered, respectively. Model clamp claw 26a...26
The upper die a is clamped and fixed on the mounting table 7 by the upper die holder 31, and the upper die a is pressed against the lower die by the upper die presser 31. In this state, molding sand is blown from the blowing device 4 into the cavity formed at the joining part of both molds a and b to form a mold. Since the upper mold a is strongly pressed against the lower mold and the mating surfaces of both molds a and b are securely brought into close contact, the generation of flash on the mating surfaces is prevented. After the molding is performed in this way, the upper mold elevating unit 30 is raised, and the upper mold a is moved to the hooks 32...3 in the unit 30 as shown in FIG. 6(I).
At the same time, the mold is separated from the lower mold by the projection of the eject bin by each ejector device [8 (see Fig. 2.3), and then the mold is moved to the raised position by the unloader 5. After that, the upper mold elevating unit 30 descends again and the sixth mold is removed.
As shown in Figure (It), the upper mold a and the lower mold are closed.

However, when replacing the molds a and b with other mold-making upper and lower molds, both the lifting units 20 and 30 are controlled by the control device 40 shown in FIG. Ru. That is, when the upper mold elevating unit 30 rises from the state shown in FIG. 6 (II) to a predetermined position while holding the upper mold a in a suspended state, the intermediate limit switch 52 (see FIG. 5) detects this. ) The upper die switching valve 43 is switched from the raised position 43b to the neutral position 43a. Therefore, the upper mold a is held at an intermediate position raised by a predetermined height h from the upper surface of the mounting table 7 while being suspended from the hooks 32...32 as shown in FIG. 6 (III). be done.

In this state, the lower die switching valve 44 shown in FIG.
53, the lower mold lifting unit 2 is switched from the lower position 844b to the upper position 448.
．． By integrally raising the clamp claws 26a...26a and the transfer rollers 25...25 at 0,
With the lower mold clamp released, the transfer roller 2
5...25, and in that case, from the above-mentioned position where the upper mold a is held suspended from the hooks 32...32, as shown in FIG. 6(IV), A predetermined height h from the top surface of the mounting table 7 is set by the lower mold.
’ position. As shown in the figure, when the lower die lifting unit 20 rises to the raised position, the upper die a is placed on the lower die, and the upper die a is attached to the upper die presser 31 and the hooks 32...32. In this state, the lower mold is supported on the transfer rollers 25 . . . 25 so as to be transferable.

Therefore, both molds a,
Both types a can be moved by simply pressing b.

It becomes possible to easily perform the carrying-out work of b and the carrying-in work of the other upper and lower molds. This eliminates the need for attaching and removing the upper and lower molds with bolts, which was conventionally performed when replacing the molds, and this type of mold replacement work is greatly simplified.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view showing the overall configuration of a modeling machine to which a support device according to the embodiment is applied, and FIG. 2 is a partially cutaway view of the support device. Figure 3.4 is an enlarged front view of the main parts shown in Figure 2, line 1-1 and IV-
FIG. 5 is a circuit diagram of the control device, and FIGS. 6(I) to (IV) are process diagrams showing the operation of the support device. DESCRIPTION OF SYMBOLS 1... Support device, 7... Mounting table, 20... Lower die lifting unit, 25... Transfer roller, 26a... Clamp claw, 30... Upper die lifting unit, 31...・Upper die presser, 32... hook, 40... control device, a,
b...Mold making mold (a...upper mold, b...lower mold).

Claims (1)

[Claims] (1) A support device that supports a mold making mold consisting of an upper mold and a lower mold, which can be raised and lowered, and clamp claws that clamp the lower mold in the lowered position and fix it on the mounting table. and a lower mold elevating unit having a transfer roller that lifts and supports the lower mold in a raised position, and an upper mold presser that is also capable of being raised and lowered and presses the upper mold onto the lower mold in the lowered position. The upper mold lifting unit has a hook that holds the upper mold in a suspended state in the raised position, and when the lower mold lifting unit is raised when replacing the mold, the upper mold lifting unit is moved so that the upper mold presser and the hook are raised. 1. A support device for a mold for mold making, comprising: a control device that holds the mold at an intermediate position so as to be in a free state with respect to the mold.