JPS6249140B2 - - Google Patents

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, etc. generally coats a cavity with resin in a cavity formed at the mating part of a mold for mold making, which consists of an upper mold and a lower mold. A mold is manufactured by blowing in molding sand and then heating it to harden it. In this method, a lower mold fixing device is used as a means to support the lower mold and upper mold in a separable manner. A support device is used that has a mounting table and a lifting unit that can be moved up and down to hold 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 the molds.

However, when carrying out 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, such as when molding different types of molds, remove each of the bolts that fix each mold in place each time, and Re-installation of molds requires troublesome work, 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, and provides a support device that is low cost and allows the mold to be easily replaced. By realizing this, the aim is to significantly improve work efficiency without increasing costs.

(Structure of the Invention) That is, the support device according to the present invention includes an upper mold lifting unit and an upper mold lifting unit that can be raised and lowered, respectively, and a lower mold lifting unit that clamps the lower mold at its lowered position. A clamp claw that is fixed on the mounting table and a transfer roller that supports the lower die in the raised position so that it can be lifted and transferred are integrally provided, and the lifting unit has a roller that presses the upper mold against the lower mold in the lowered position. The present invention is characterized in that a mold presser and a hook for holding the upper mold in a suspended state in the raised position are integrally provided, and further includes a control device 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 lifting unit, and
When replacing the mold, with the lower mold elevating unit raised, the upper mold presser and the hook act to hold the upper mold elevating unit in an intermediate position so that it is released from the upper mold.

According to such a configuration, by raising and lowering the upper mold with the upper mold lifting unit while the lower mold is fixed on the mounting table by the lower mold lifting unit, both molds can be moved without using mold fixing bolts. 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 placed on the transfer roller with the upper mold resting on the lower mold. It becomes possible to support it so that it can be transported.

(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 mold can be opened and closed on the transfer roller. Since the mold can be supported in a transportable manner, the work of attaching and removing bolts, which is required when replacing the mold, is no longer necessary. This makes it possible to easily replace the molds associated with the mold making work at low cost, and greatly improves the efficiency of this type of mold replacement work.

(Example) Hereinafter, an example of the present invention will be described 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 that supports the upper mold a and the lower mold b, and a supporting device 3 that is arranged in the main frame 2 so as to be movable back and forth with respect to the molds a and b, and is formed at the joining part of the molds a and b when the molds are closed. blowing device 4 that supplies molding sand into the cavity, and both types a and b.
and an unloader 5 for taking out the mold formed by the mold. Each of the devices 3, 4, and 5 is driven by air supplied from an air supply source 6 provided below the main frame 2, thereby opening and closing the molds a and b, and opening and closing them. Predetermined operations such as blowing in foundry sand and removing the mold after molding are performed repeatedly in sequence.

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 b is placed, and a lower mold elevating unit 20 that is provided to be movable up and down with respect to the mounting table 7.
and an upper mold elevating unit 30 which is provided above the lower mold elevating unit 20 so that it can also be raised and lowered. Here, in this embodiment, two sets of both molds a and b can be set on the support device 3, and each lower mold b
Although not shown, a plurality of eject pins are provided for separating the mold after molding from the lower mold b. Moreover, the above-mentioned mounting table 7 is divided along the longitudinal direction at predetermined intervals, so that
The mounting table 7 is designed not to interfere with the mold separation eject pin that protrudes downward from the lower mold b when the lower mold b is set. Further, below the mounting table 7, ejecting devices 8, 8 are arranged corresponding to the set positions of the lower molds b, respectively. The ejecting devices 8, 8 each have an ejecting plate 11 connected above an ejecting air cylinder 10 attached to a fixed frame 9, and when the mold is taken out from the lower mold b, the plate 11 is connected to the cylinder 10. Therefore, the eject pin in the lower mold b is driven upward to the lower mold b.
By protruding toward the cavity side of the mold, the lower mold b and the mold are separated. Here, the ejecting device 8 is provided with guide portions 12, 12, respectively, for guiding the ejecting plate 11 up and down.

Further, the lower die lifting unit 20 is mounted on a mounting table 7.
Two frames 2 arranged parallel to the longitudinal direction of
1 and 21, and plates 22 and 22 that connect both ends of each frame 21 and 21 to each other. Piston rods 23a, 23a of two lifting air cylinders 23, 23 fixed to both sides of the mounting table 7 via brackets 13, 13, respectively, are connected to the plates 21, 21, respectively. .

A plurality of roller mounting members 24 . . . 24 are arranged side by side on the upper surfaces of the frames 21 , 21 of the lower die lifting unit 20 , and transfer rollers 25 . 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 are designed to protrude above the mounting table 7 when the unit 20 is raised. . In addition, each roller mounting member 24...24 except for the roller mounting members 24 at both ends has clamp members 26...2 having clamp claws 26a...26a on the upper part.
6 is fixed in a replaceable manner, and the above unit 2
At the lowered position 0, each clamp claw 26a...26a clamps the flange portions _b1 , _b1 of the lower die b and fixes them on the mounting table 7. Here, a plurality of notches 7a...7a are formed on the mounting table 7 in order to avoid interference with the roller mounting members 24...24 or the clamp members 26...26, and the clamp members 26...26 are provided with a plurality of notches 7a...7a. Clamp claw 2
The distance between the rollers 6a...26a and the transfer rollers 25...25 is set to be larger than the height of the flange portions _b1 , _b1 of the lower mold b.

On the other hand, the upper mold elevating unit 30 has an upper mold presser 31 that presses the upper mold a against the lower mold b in its lowered position.
and a plurality of hooks 32 that are attached to the upper mold holder 31 and hold the upper mold a in a suspended state in the raised position.
...32, and these are raised and lowered integrally by an air cylinder 33 for raising and lowering provided above. The lifting air cylinder 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. Then, the upper mold presser 31
A pin joint 3 is attached to the tip of the piston rod 33a.
5, so that when the upper mold holder 31 is lowered, the upper mold a can be smoothly matched with the lower mold b. Further, two guide rods 36, 36 are provided upright on both sides of the upper surface of the upper die presser 31, and the rods 36, 36 are slidably fitted into guide tubes 37, 37 fixed to the bracket 34, respectively. By being inserted, the upper mold presser 31 is guided in the vertical direction.

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 a supply passage 41 from the air supply source 6 and a drain passage 42 communicating with the atmosphere.
The upper mold switching valve 43 and the lower mold switching valve 44 are connected to the upper mold switching valve 43 and the lower working chamber 33b and the upper working chamber in the lifting air cylinder 33 of the upper mold lifting unit 30, respectively. 33c, and the lower working chambers 23b, 23b and upper part of the lifting air cylinders 23, 23 of the lower mold lifting unit 20, which are guided from the lower mold switching valve 44. Working chamber 23
third and fourth supply/discharge passages 47 leading to c and 23c, respectively;
48. The upper type switching valve 43 has a neutral position 43a that blocks the supply passage 41 and the drain passage 42 from the first and second supply and discharge passages 45 and 46.
, a raised position 43b in which the supply passage 41 is communicated with the first supply and discharge passage 45 and the second supply and discharge passage 46 is communicated with the drain passage 42; A lowered position 43c is provided to communicate the supply/discharge passage 45 with the drain passage 42, and the raised position 43b is taken when the first solenoid 43d is activated, and the lowered position 43c is taken when the second solenoid 43e is activated. There is. 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 raised position 44b is provided which communicates with the supply/discharge passage 48 and communicates the third supply/discharge passage 47 with the drain passage 42.The raised position 44a is taken when the third solenoid 44c is activated, and the raised position 44b is taken when the fourth solenoid 44d is activated. The lowered position 44b is taken. Here, one-way check valves 49...49 are provided on the first to fourth supply/discharge passages 45 to 48, respectively.

In addition to the above-mentioned configuration, this control device 40 has an air cylinder 33 for lifting and lowering in the upper mold lifting unit 30, which detects the lowering position and the raising position of the piston rod 33a, and controls the upper mold switching valve 4.
first and second limit switches 50, 51 for causing the upper mold switching valve 43 to take the neutral position 43a, and an intermediate limit switch 52 for detecting the intermediate position of the piston rod 33a and causing the upper mold switching valve 43 to take the neutral position 43a when changing the mold. It is being In addition, the air cylinder 23 for lifting and lowering the lower die lifting unit 20,
23 is provided with third and fourth limit switches 53, 53 and 54, 54 for detecting the lowered and raised positions of the piston rod 23a, respectively.

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

First, the upper mold a and the lower mold b 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. The mold b is clamped and fixed on the mounting table 7 by the clamp claws 26a...26a, and the upper mold presser 31
The upper die a is pressed against the lower die b. 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. In this case, the upper mold presser 31 is As a result, the upper mold a is strongly pressed against the lower mold b, and the mating surfaces of both molds a and b are reliably brought into close contact, thereby preventing the occurrence of flash on the mating surfaces. After the molding is performed in this manner, the upper mold elevating unit 30 is raised, and the upper mold a is held by the hooks 32...32 in the unit 30 as shown in FIG. While being moved to the raised position, the mold is separated from the lower mold b by the ejector pins projected by each ejector 8 (see Figures 2 and 3), and then removed from the lower mold b by the unloader 5. After that, the upper mold elevating unit 30 descends again to raise the upper mold a as shown in FIG.
And the lower mold b is closed.

However, when replacing the molds a and b with other mold-making upper and lower molds, the lifting units 20 and 30 are controlled as follows by the control device 40 shown in FIG. controlled. That is, when the upper die lifting unit 30 rises from the state shown in FIG. 6 to a predetermined position while holding the upper die a in a suspended state, the intermediate limit switch 52 detects this.
The upper die switching valve 43 is switched from the raised position 43b to the neutral position 43a in response to a signal from the upper die (see FIG. 5). Therefore, as shown in FIG. 6, the upper mold a is suspended from the hooks 32 .

In addition, in this state, the lower die switching valve 4 shown in FIG.
4 is switched from the lower position 44b to the upper position 44a based on the signal from the third limit switches 53, 53 in the lower mold lifting unit 20, and along with this, the clamp claws 26a...26a and the transfer roller in the lower mold lifting unit 20 are switched from the lower position 44b to the raised position 44a. 25...25 rise together, so that the lower mold b is lifted by the transfer rollers 25...25 in an unclamped state. In this case,
From the above-mentioned position where the upper mold a is held suspended from the hooks 32...32, as shown in FIG.
A predetermined height from the top surface of the mounting table 7 is set by the lower mold b.
It is further lifted to the position h′. Then, 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 b, and the upper die a is attached to the upper die presser 31 and the hooks 32...3.
2, and in this state, the lower die b is supported on transfer rollers 25...25 so as to be transferable. Therefore, by simply pushing and moving both molds a and b onto guide rollers (not shown) that are separately installed at the same height as the transfer rollers 25...25, the work of transporting the molds a and b and other operations can be carried out. Carrying in the upper and lower molds can be carried out easily. This results in
The work of attaching and removing the upper and lower molds using bolts, which was conventionally performed when exchanging molds, is no longer necessary, and this type of mold exchanging 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. Figures 3 and 4 are longitudinal sectional side views and plan views cut along lines ``-'' and ``-'' in Figure 2, respectively, Figure 5 is a circuit diagram of the control device, and Figures 6 to 6 are the above-mentioned diagrams. FIG. 3 is a process diagram showing the actions of the support devices. DESCRIPTION OF SYMBOLS 1...Support device, 7...Place 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 die, b... Lower die).

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 has a clamp claw and a lifter that clamps the lower mold in the lowered position and fixes it on the mounting table. A lower die lifting unit having a transfer roller that lifts and supports the lower die at a lower position, and an upper die presser that can also be raised and lowered and presses the upper die onto the lower die at the lowered position, and a raised position. The upper mold lifting unit has a hook that holds the upper mold in a suspended state, and when replacing the mold, the lower mold lifting unit is raised, and the upper mold holding unit and the hook are attached to the upper mold. 1. A support device for a mold for mold making, comprising: a control device for holding the mold at an intermediate position so as to be in a free state.