JPS5853351A - Removing device for mold in molding machine with horizontally split mold - Google Patents

Abstract

PURPOSE:To produce molds of a low cost efficiently by opening molds in holding their upper mold, forcing the same downward and removing the molds. CONSTITUTION:A titled device is constituted of a supporting member 64 which is inserted between an upper mold 12 and a lower mold 10 after mold opening, a mold receiving member 66 which is supported movably upward and downward by means of the member 64, springs 70 which energize the member 66 toward the up position, transmission members 58, 60, 62 which transmit the forcing- down of an ejection plate 48 to the member 64 by interposing the member 64 and the plate 48 when the plate 48 is moved downward while the member 64 is in the up position, and a vertically moving and driving device which moves the member 64 upward toward the mold 12 and permits descending of the member 64 together with the plate 48 when the forcing-down force of the plate 48 is transmitted to the member 64.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a horizontally split mold making device (in many ways), in which a mold such as a core held in an upper mold is moved downward by the action of an extrusion bottle. It relates to a type that can be taken out by pressing down.

In horizontal split mold making machines, there are two ways to take out the mold that has been made: one is to push the mold held in the upper mold down with an extrusion bottle (push-down method), and the other is to take out the mold held in the lower mold by extruding it as well. A method is used in which the bottle is pushed up and taken out (push-up method). Among these methods, the push-up method involves pushing the mold held in the lower mold after opening the mold by raising an extrusion bottle placed below the mold, and when the mold is removed from the lower mold, the mold is removed. Generally, a receiving part for receiving the extrusion pin is inserted into a lower position of the mold from the lateral direction, and when the extrusion pin is returned, the receiving part takes out the mold which descends with it.

On the other hand, in the push-down method, when the mold has been in place for a predetermined amount, the receiving part is inserted between the open molds from the side, and at the same time, the ejector pin is lowered from above the upper mold to hold it in the upper mold. Generally, the mold is dropped onto a receiver. Mold removal using this push-down method has the advantage of high efficiency in molding work because the removal device can be activated from an early stage of mold opening, but on the other hand, since the mold is dropped onto the receiving member by gravity, There was a problem that the mold was damaged by impact. For this reason, when removing the mold using the push-down method, materials for reinforcing the mold are mixed with the foundry sand.
Although attempts are made to increase the amount of resin added or to add high quality resins, this inevitably raises the problem of increased manufacturing costs.

The present invention was made against this background, and its purpose is to efficiently carry out the molding work, and to avoid damaging the mold when it is taken out, while eliminating the need for expensive additives. It is an object of the present invention to provide a mold ejecting device that does not require the following.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numerals 10.12 and 10.12 respectively represent a lower mold and an upper mold in a molding machine, and each has a cavity ff1s14.16 for forming a cavity inside. The lower mold 10 is fixed to a movable part Δ18 that can be raised and lowered, and the lower mold 12 is fixed to a hanging frame 24. The operating part 18 is fixed to the lower plate 22 of the machine frame 20. plunger 27 of cylinder 26
It is clearly stated at the top of the page. On the other hand, the hanging frame 24 is suspended from the base 30 of the machine frame 20 in the lot '28.

A hopper 32 and an air supply device 634 are arranged on the upper plate 30, and a molding sand supply device 38 and a press 11) device 40 are provided.
is suspended from a rail 42 fixed to the lower surface of the upper board 30 so as to be movable in the horizontal direction.

These sand supply equipment 38 and extrusion bag @40 are
4, and the length of the connecting rod 44 is adjusted so that when the molding sand supply device 38 is located directly below the hopper 32, the extrusion bag fii 40 is located directly below the air supply device 34 and directly above the upper die 12. The size is determined. Air supply device 3
The blower outlet 46 of No. 4 is lowered by a cylinder mechanism (not shown).
0 is pushed down.

That is, in a state where the lower die 10 is raised, the blow head 47 connects to the blowing port 50.5 of the upper die 12 shown in FIG.
0 and molding sand is blown into the cavity from here. Further, the extrusion plate 48 is connected to the upper die 12.
Push-out pin 54.54 inserted into the air inlet 50.50 of
The shape of the core 56 (the shape of the cavity portion 14.16 of the upper mold 12 and the lower mold 10) that is left on the upper mold 12 side when the mold is opened after molding is There are 5 such as to push down (selected as follows). At both ends of the extrusion plate 48 there are first interlocking bins 58.
58 is provided facing downward, and when the extrusion plate 48 is lowered, this interlocking bottle 58.58 is inserted into the bottle hole 60.60 provided in the upper mold 12, and the linking bottle 58.
The second interlocking bin 62.0.60 is inserted from below.
62 and further to the support body 64 to which this second interlocking pin 62.62 is fixed.

The support main body 64 serves as the main body of a mechanism for receiving the core 56 projected from the upper die 12, and supports the second interlocking bin 62.
A receiving plate 66 is held between the members 62 . The receiving plate 66 has a rod 68.68 on its underside, which rod 68.
68 is inserted into a through hole provided in the support body 64 to guide its lifting and lowering, and is urged upward by a coil spring 70, 70 fitted to the rod 68, 68. ing. The rods 68.68 are connected to the support body 6 by means of pins 72.72 fixed at each lower end.
4 is prevented from leaving.

6- In addition, the positioning bin 7 is installed upright at one end of the support body 64.
4 acts to define the rising end of the support body 64 by abutting its upper end against the upper die 12.

As is clear from FIG. 1, the support body 64 has a guided portion 76 at one end, and a cylinder 7
The rod 80 of 8 is fixed so that the support body 64 can be raised and lowered by the cylinder 78,
The guided portion 76 is a holding member 8 located on the side of the machine frame 20.
It is held by two upright parts 84 and can be raised and lowered along these upright parts 84. The cylinder 78 is connected to an air source 88 via a switching valve 86 and is connected to an air source 88 via a switching valve 86.
is connected to a control device 90, and its operation is controlled by the device 90. The switching valve 86 switches the air flow path to three ways, A, B, and C shown in FIG. 1, by energizing and demagnetizing the solenoids 92 and 94. The control device 90 includes a bracket 95 fixed to the holding member 82.
A pair of limit switches 96 and 98 are connected vertically apart from each other by a predetermined distance.
A protrusion 100 is provided on the side of the guided portion 76 of No. 4, and when the limit switch 96 or 98 is actuated by the protrusion 100, a signal is emitted to the control device 90, and the device performs a control operation based on this signal. It is configured to do the following.

The cylinder 78 that drives the support body 64 up and down is held by a holding member 82, and this holding member 82 moves the support base 102J- by the horizontal drive cylinder 104, thereby causing the support body 64 to move up and down. It can also be moved horizontally.

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

The plunger 27 of the cylinder 26 is pushed out and the pair of molds 1
0.12 In the closed state, the blow head 47 is pressed against the blow opening 50.50 of the upper mold 12, from which the foundry sand is blown into the cavity. When the blowing is finished, the blowing spatula F'47 is retracted, and then the scraper device (not shown) is activated to scrape off the molding sand that has built up in the blowing port 50.50 -1-. As shown in FIG. 2, the surface of the molding sand is made into a flat surface that corresponds to the upper surface of the upper mold 12. After that, during a certain period of time, the molding sand blown into the cavity is heated and hardened by the lower mold 10 and the upper mold 12, and becomes the core 56. During this heating and curing time, the molding sand supply device @38 is moved directly below the hopper 32, and at the same time, the extrusion device 40 is moved directly above the upper mold 12.

Once the core 56 is hardened, the cylinder 26 is activated to lower the lower mold 10. When the lower mold lO is lowered to a predetermined height, the holding member 82 is moved to the left in FIG. be done. still,
At this time, the support body 64 is in the lowered position. Holding member 82
At the same time, a limit switch (not shown) is actuated to send a signal to the control device 90, so that the switching valve 86 is switched to the A position.
state. Then the cylinder 78 becomes the rod 8
Since the supporting body 64 is moved upward in a direction to push out the upper die 12, the supporting body 64 is raised to follow the upper die 12 and press the receiving plate 66 against the lower surface of the core 56. The support body 64 is continuously raised until the positioning pin 74 contacts the lower surface of the upper mold 12 as shown in FIG. 62 is inserted into the bottle hole 60, 60 of the upper mold 12. Although the protrusion 100 of the support body 64 passes the upper limit switch 96 in the process of rising, it does not switch the switching valve 86, and the switching valve 86 is still in the state A and the cylinder 7 is not switched.
Continue to supply air to 8. The sequence circuit of the control device 90 is configured in this way.

Subsequently, the outlet 46 is lowered to push down the extrusion plate 48, and as a result, the core 56 is pushed into the extrusion bottle 5 as shown in FIG.
4.54, the first interlocking bottle 58 fitted into the bottle hole 60.60 of the lower die 12 is pushed downward by the extrusion bottle 54.54 at the same time as the extrusion bottle 54.54 contacts the core 56, or after a slight delay. .510-8 abuts the second interlocking bin 62.62 of the support body 64,
The support body 64 is lowered in synchronization with the lowering of the push-out plate 48. The support body 64 is lowered by a force that overcomes the pushing up force of the cylinder 78, and as a result, the core 56 is moved down against the receiving plate 6.
6 and extrusion pins 54, 54, the mold is removed from the upper mold 12. Note that the first and second interlocking bins 58, 58, 60, 60 may come into contact with each other prior to the ejector pins 54, 54 coming into contact with the core 56; In case of extrusion pin 54.54
At the time when the receiving plate 66 contacts the core 56, the receiving plate 66 is just in contact with the core 56, or the spring 70 biasing it
must be in a slightly bent state.

When the support body 64 is lowered by a certain amount as described above, the protrusion lOO formed on the guided portion 76 operates the upper limit switch 96, and based on this, a control signal is issued from the control device 90. is issued, and the switching valve 86 switches to C.
state. Then the cylinder 78 is connected to the rod 8
Since the supporting body 64 is actuated in the direction of retracting the cylinder 78 downward, the support main body 64 is now driven by the cylinder 78 and begins to move downward. After this, the downward movement of the push-out plate 48 stops and the distance between the support body 64 and the push-out plate 48 increases, and the second
Interlock bin 62.62 moves away from first interlock bin 58.58. However, at this point, the core 56 is pressed against the ejector pin 54 by the force of the spring 70 via the receiving plate 66. The support body 64 further descends and the bin 7
When the spring 70 comes into contact with the main body 64 (support 1), the spring 70 is prevented from expanding any further.
move away from

When the support body 64 is lowered to a height sufficient for core removal, the protrusion 100 activates the lower limit switch 98. As a result, the switching valve 86 is brought to the center position, that is, the state B, and the air supply to the cylinder 78 is stopped. Next, when the horizontal movement cylinder 104 is activated and the holding line A82 is moved to the right in FIG. 1, the support body 64 is pulled out from between the pair of molds 10. The child 56 is taken out.

With the core 56 removed, the lower mold 10 is raised by the cylinder 26 and brought into close contact with the upper mold 12. The sand supply bag @38 is moved to a position directly above the upper mold 12, and the above-described operation is repeated thereafter.

In this manner, the present core takeout device can smoothly transition from being held by the upper mold 12 to being supported by the receiving plate 66 without applying impact to the core 56 when taking out the core, thereby preventing the core 56 from being damaged. Therefore, there is no need to add high quality additives to the foundry sand in advance or increase the amount of resin added, and cores of good quality can always be supplied at low cost. In such a device, the transfer of the core 56 from the upper mold 12 to the receiving plate 66 is extremely smooth, so the shape is complex and includes many protrusions, and parts of the core 56 may break at the protrusions. It can be applied to a wide range of applications, such as being applicable to molding machines for easy-to-use cores or relatively low-strength cores.

Moreover, the above device has an extrusion pin 5 at the blowing port 50 of the upper die 12.
Since the core can be extruded by inserting the extrusion pin 54, there is no need to provide a dedicated hole in the mold for inserting the extrusion pin 54, which has the advantage of simplifying the mold accordingly. Retain the general advantages of That is, the above device can operate the core removal device including the support body from an early point in time when the mold is opened, and the core removal operation can be performed in parallel with the mold opening operation, thereby speeding up the molding work. This reduces wasted time and increases productivity, thereby contributing to lower product costs.

In the above embodiment, a shell mold making machine in which the mold is hardened by heat was explained as an example, but the present invention can also be applied to a gas hardening mold machine, etc. Also, unlike the above embodiment, the lower mold It is also possible to apply it to a type of device in which the device is raised and lowered by a drive device.

=14- It is also possible to provide the upper mold 12 with a rod that passes through the L mold in the vertical direction and is slidable, and this rod can be used in place of the first and second interlocking bins 58 and 62. and
In short, it is sufficient to provide a transmission member that is interposed between the extrusion plate 48 and the support body 64 and can transmit the pressing blade of the extrusion plate 48 to the support body 64.

Further, the device for driving the support ff1sU shown as the support body 64 in the above embodiment is not limited to that of the above embodiment, and the receiving plate 66 as a mold receiving member is connected to the core 5.
6 (generally a mold) and then allow the support member to be pressed down by the push-down blade of the extrusion plate 48. The horizontal movement can also be done manually.

As is clear from the above description, the vI type take-out device according to the present invention is equipped with a horizontally split mold, and is configured so that the formed mold is held in the upper mold and separated from the lower mold when the mold is opened. In a split mold making machine, the mold held in the upper mold is extruded downward by an extrusion pin fixed to an extrusion plate, and the mold ejection device does not take it out of the mold. a supporting heating material inserted between the mold and the lower mold;
(2) a mold receiving member supported movably up and down by the support portion A; (3) a spring biasing the mold receiving member toward the raised position; and (4) the supporting thin member being in the raised position. (6) a transmission part that is interposed between the two when the extrusion plate is lowered in the state and transmits the push-down blade of the extrusion plate to the support part; and a lifting drive device that allows the support part side to move downward together with the push-out plate when the push-down blade of the push-out plate is transmitted to the support part AΔ. That is.

In order to avoid applying a drop impact to the mold, such a mold removal device adopts a highly efficient push-down method in which the mold is held in the upper mold, opened, and then pushed down to take it out. It is possible. Therefore, it is no longer necessary to increase the amount of resin added to the molding sand or to use high-grade resin as a binder, and it becomes possible to efficiently make and firm a low-cost mold.

[Brief explanation of the drawing]

FIG. 1 is a front view of a core molding machine including a core extraction device according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing the main parts of the core extraction device in FIG. FIG. 4u is a sectional view showing the same part in different operating states. 10: Lower mold 12: L-type 48: Extrusion plate 54: Extrusion bottle 56: Core
58: First interlocking bin 62: Second interlocking bin 6
4: Support body 66: Receiving plate 70: Coil spring 74: Positioning pin 78 Niji Linda Applicant
Toyota Motor Corporation Figure 2 Figure 3

Claims (1)

[Claims] A horizontally split mold making machine comprising a horizontally split mold and configured such that a formed mold is held in the upper mold and separated from the lower mold when the mold is opened, wherein the mold is held in the upper mold. A mold ejecting device for extruding a mold in a mold downward and ejecting it out of the mold by an extrusion bottle fixed to an extrusion plate, the device comprising: a support member inserted between an upper mold and a lower mold after the mold is opened; A mold receiving member supported to be movable up and down, a spring urging the mold receiving member toward a raised position, and a spring between them when the extrusion plate is lowered with the supporting member in the raised position. a transmission member that intervenes and transmits the push-down blade of the extrusion plate to the support member; and the push-down blade of the extrusion plate is transmitted to the support portion paulownia while the support member is raised toward the upper die. 1. A mold removal device for a horizontally split mold making machine, characterized in that the device further comprises an elevating drive device that allows the support member to move down together with the extrusion plate.