JPH0216179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold ejecting device for a horizontally split mold making machine, and particularly to a mold ejecting device of a type in which a mold such as a core held in an upper mold is pushed downward by the action of an extrusion pin when the mold is opened. related to things.

In horizontal split mold making machines, there are two ways to take out the mold that has been made: one in which the mold held in the upper mold is pushed down with an extrusion pin (push-down method);
A method is used in which a mold held in a lower mold is pushed up and taken out using an extrusion pin (push-up method). Among these methods, the push-up method involves pushing the mold held in the lower mold after opening the mold by lifting an ejector pin placed below the lower mold, thereby removing the mold from the lower mold. Generally, a receiving member for receiving the mold is inserted laterally into a position below the mold, and the receiving member receives and takes out the mold that descends with the extrusion pin when the extrusion pin is returned.

On the other hand, in the push-down method, when the mold has opened a predetermined amount, the receiving member is inserted from the side between the open molds, and at the same time, the ejector pin is lowered from above the upper mold to hold the mold in the upper mold. It is common to drop the material onto a receiving member. 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 the impact. For this reason, when removing a mold using the push-down method, materials for reinforcing the mold are mixed with the foundry sand, the amount of resin added, or high-grade resin is added, but this reduces manufacturing costs. This inevitably results in an increase in the number of people.

The present invention was made against the background of the above circumstances, and its purpose is to efficiently carry out molding operations, without damaging the mold when it is taken out, and without using 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, numerals 10 and 12 are a lower die and an upper die, respectively, of a molding machine, and are provided with hollow parts 14 and 16 for forming a cavity inside. The lower mold 10 is fixed to a movable member 18 that can be raised and lowered, and the upper mold 12 is fixed to a hanging frame 24. The movable member 18 is fixed to the upper end of a plunger 27 of a cylinder 26 fixed to the lower plate 22 of the machine frame 20. On the other hand, the hanging frame 24 is suspended from the upper board 30 of the machine frame 20 by rods 28.

A hopper 32 and an air supply device 34 are installed on the upper board 30.
A rail 4 is provided with a molding sand supply device 38 and an extrusion device 40 fixed to the lower surface of the upper plate 30.
2 so that it can move horizontally.
The molding sand supply device 38 and the extrusion device 40 are connected by a connecting rod 44, and when the molding sand supply device 38 is located directly below the hopper 32, the extrusion device 40 is located directly below the air supply device 34 and the upper die 12. The length of the connecting rod 44 is determined so that it is located directly above the connecting rod. The air outlet 46 of the air supply device 34 is configured to be lowered by a cylinder mechanism (not shown), and the air outlet 46 allows the molding sand supply device 3 to be lowered.
Blow head 47 and extrusion device 4 provided in 8
0 is pressed down.

That is, when the lower mold 10 is raised, the blow head 47 is pressed against the blowing ports 50, 50 of the upper mold 12 shown in FIG. 2, and molding sand is blown into the cavity from there. Further, the extrusion plate 48 is connected to the blowing ports 50 and 5 of the upper die 12.
The ejector pins 54, 54 have a core 56 (cavity of the upper mold 12, lower mold 10) that is left on the upper mold 12 side when the mold is opened after molding. The shapes of the cavities 14, 16 are selected accordingly). First interlocking pins 58, 58 are provided at both ends of the extrusion plate 48, facing downward, and when the extrusion plate 48 is lowered, the interlocking pins 58,
58 is inserted into the pin holes 60, 60 provided in the upper mold 12, and then the second interlocking pin 62 is inserted into the second interlocking pin 62, 62 inserted into the pin hole 60, 60 from below. , 62 are fixed to the supporting body 64.

The support body 64 serves as the main body of a mechanism for receiving the core 56 projected from the upper mold 12, and is
A receiving plate 66 is held between the interlocking pins 62, 62. The receiving plate 66 has rods 68, 6 on its lower side.
8, and these rods 68, 68 support the support body 64.
The rod 68,
It is biased upward by coil springs 70, 70 fitted in 68. Rod 68,6
8 is prevented from detaching from the support body 64 by pins 72, 72 fixed to each lower end. The positioning pin 74 erected at one end of the support body 64 acts to define the rising end of the support body 64 by abutting the upper end of the positioning pin 74 against the upper die 12 .

As is clear from FIG.
It has a guided part 76 at one end, and this guided part 76
A rod 80 of a cylinder 78 is fixed to the cylinder 78 so that the support body 64 can be raised and lowered by the cylinder 78, and the guided portion 76 is attached to a holding member 82 located on the side of the machine frame 20. Upright part 8
4 and can be raised and lowered along this upright portion 84. The cylinder 78 is connected to an air source 88 via a switching valve 86, and the switching valve 86 is also connected to a control device 90 so that 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. A pair of limit switches 96 and 98 are connected to a bracket 95 fixed to the holding member 82 and are vertically spaced apart from each other by a predetermined distance. A protrusion 100 is provided, and when the limit switches 96, 98 are 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.

The cylinder 7 drives the support body 64 up and down.
8 is held by a holding member 82, and this holding member 82 moves the horizontal driving cylinder 1 on the support stand 102.
04, so that the support body 64 can be moved not only vertically but also horizontally.

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

With the plunger 27 of the cylinder 26 pushed out and the pair of dies 10, 12 closed, the blow head 47 is pressed against the blowing ports 50, 50 of the upper die 12, from which molding sand is blown into the cavity. . When the blowing is finished, the blowhead 47 is retracted, and a scraper device (not shown) is operated to scrape off the foundry sand that has piled up on the blowing ports 50, 50, and as shown in FIG. The surface of the sand is flattened to match the top surface of the upper die 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 hardening time, the molding sand supply device 38
2, 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 10 is lowered to a predetermined height, the holding member 82 is moved to the left in FIG. inserted into. Note that at this time, the support body 64 is in the lowered position. Movement of the holding member 82 to the left is prevented by a stopper (not shown), and at the same time, a limit switch (not shown) is activated to send a signal to the control device 90, thereby switching the switching valve 86 to state A. It will be done. Then, the cylinder 78 is actuated to push the rod 80 upward, so the support body 64 is raised to follow the upper die 12, and the receiving plate 66 is pushed up against the core 56.
Press it against the bottom surface of the The support body 64 is continuously raised until the positioning pin 74 comes into contact with the lower surface of the upper mold 12 as shown in FIG. The tips of 62 are fitted into the pin holes 60, 60 of the upper mold 12. Note that the protrusion 100 of the support body 64 passes the upper limit switch 96 in the process of rising, but this does not switch the switching valve 86, and the switching valve 86 is still in the state A and the cylinder 78 is closed. Continue to supply air to. The sequence circuit of the control device 90 is configured in this manner.

Subsequently, the blower outlet 46 is lowered and the extrusion plate 4
8, and as a result, the core 5 is pressed down as shown in Figure 3.
6 are pushed downward by the ejector pins 54, 54, and the ejector pins 54, 54 fit into the pin holes 60, 60 of the upper mold 12 at the same time as they abut against the core 56, or with a slight delay. The first interlocking pin 58,5
8 comes into contact with the second interlocking pins 62, 62 of the support body 64, and the support body 64 is moved in synchronization with the lowering of the push-out plate 48.
lower. 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 between the receiving plate 66 and the push-out pins 54, 5.
The mold is released from the upper mold 12 while remaining sandwiched between the molds 4 and 4. In addition, the first and second interlocking pins 5
8, 58, 60, 60 may be brought into contact with the ejector pins 54, 54 prior to the contact with the core 56, but in this case also, the ejector pins 54, 54 At the time of contact with the core 56, it is necessary that the receiving plate 66 is just in contact with the core 56, or that the spring 70 that biases it is in a slightly bent state.

When the support body 64 is lowered by a certain amount as described above, the protrusion 10 formed on the guided portion 76
0 operates the upper limit switch 96, and based on this, a control signal is issued from the control device 90, and the switching valve 86 is switched to the C state. Then, the cylinder 78 operates in a direction to retract the rod 80 downward, so that the support body 64 is now driven by the cylinder 78 and begins to descend. Since the push-out plate 48 is stopped from descending a little later, the distance between the support body 64 and the push-out plate 48 is widened, and the second interlocking pins 62, 62 are connected to the first interlocking pin 5.
Stay away from 8,58. However, at this point, the core 56 remains attached to the push-out pin 54 via the receiving plate 66 by the biasing force of the spring 70. When the support body 64 further descends and the pin 72 comes into contact with the support body 64, the spring 70 is prevented from expanding any further, so at this point the core 56 remains supported by the receiving plate 66.ゝIt separates from the push-out pin 54.

When the support body 64 is lowered to a height sufficient for core removal, the protrusion 100 actuates 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. Subsequently, the cylinder 104 for horizontal movement is actuated to move the holding member 82 to the first position.
When the support body 64 is moved to the right in the figure, the support body 64 is simultaneously pulled out from between the pair of molds 10 and 12, and the core 56 is taken out.

With the core 56 removed, the lower mold 10
is raised by the cylinder 26 and the upper mold 1
In parallel with this, the molding sand supply device 38, which is supplied with molding sand from the hopper 32, is moved to a position directly above the upper mold 12, and the above-mentioned operation is repeated thereafter. It turns out.

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. Since such a device transfers the core 56 from the upper mold 12 to the receiving plate 66 extremely smoothly, it has a complex shape and includes many protrusions, etc., and is easily damaged partially at the protrusions. This makes it possible to apply the method to a wide range of applications, including applications for molding machines for cores or cores with relatively low strength.

Furthermore, since the above device can extrude the core by inserting the extrusion pin 54 into the blowing port 50 of the upper mold 12, it is necessary to provide a dedicated pin hole in the mold for inserting the extrusion pin 54. This method has the advantage of simplifying the mold, and also maintains the general advantages of the push-down method. That is, the above device can operate the core removal device including the support body from an early stage of mold opening, and can perform the core removal operation in parallel with the mold opening operation. Wasted time in molding work is reduced, productivity is increased, and this contributes to lower product costs.

In the above embodiment, a shell molding 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-curing molding machine, etc., and different from the above embodiment. It is also possible to apply the present invention to a type in which the lower mold is raised and lowered by a drive device.

Further, the upper mold 12 is provided with a rod that passes through the upper mold in the vertical direction and is slidable, and this rod is connected to the first mold.
It is also possible to use it in place of the second interlocking pins 58 and 62, and in short, it can be used as a transmission device that is interposed between the push-out plate 48 and the support body 64 and can transmit the pressing force of the push-out plate 48 to the support body 64. All that is required is to provide the members.

Further, the device for driving the support member 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 56 (generally a mold). Any device may be used as long as it allows the support member to be raised until it comes into contact with the support member, and then be pushed down by the pressing force of the push-out plate 48, and the horizontal movement of the support member may also be performed manually. It is possible.

As is clear from the above description, the mold removal device according to the present invention is equipped with a horizontally split mold, and is configured such that the mold that has been formed is held in the upper mold and separated from the lower mold when the mold is opened. In a mold making machine, a mold ejecting device for extruding the mold held in the upper mold downward by an extrusion pin fixed to the extrusion plate and ejecting it out of the mold, which (1) removes the mold from the upper mold after opening the mold; a support member inserted between the lower mold, (2) a mold support member supported by the support member so as to be movable up and down, and (3) a spring that urges the mold support member toward a raised position. and (4) a transmission member that is interposed between the support member when the push-out plate is lowered in the raised position and transmits the pressing force of the push-out plate to the support member; ) an elevating drive device that raises the support member toward the upper die and allows the support member to descend together with the extrusion plate when the push-down force of the extrusion plate is transmitted to the support member; It is characterized by containing.

According to such a mold removal device, the mold is held in the upper mold to open the mold, and the mold is pushed down to take it out, which is a highly efficient push-down method, while avoiding the impact of falling on the mold. obtain. Therefore, there is no need 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 manufacture low-cost molds.

[Brief explanation of drawings]

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. The figures are cross-sectional views showing the same part in different operating states. 10: Lower mold, 12: Upper mold, 48: Extrusion plate, 5
4: Extrusion pin, 56: Core, 58: First interlocking pin, 62: Second interlocking pin, 64: Support main body, 6
6: Receiving plate, 70: Coil spring, 74: Positioning pin, 78: Cylinder.

Claims (1)

[Scope of Claims] 1. A horizontally split mold making machine that is equipped with a horizontally split mold and is configured such that the formed mold is held in the upper mold and separated from the lower mold when the mold is opened. A mold ejecting device for extruding a mold in a mold downwardly and ejecting it out of the mold by an extrusion pin fixed to an extrusion plate, which comprises: a support member inserted between an upper mold and a lower mold after the mold is opened; a mold receiving member supported movably up and down by a support member; a spring urging the mold receiving member toward a raised position; and when the extrusion plate is lowered with the supporting member in the raised position. a transmission member that is interposed between the two and transmits the pressing force of the extrusion plate to the support member; A mold ejecting device for a horizontally split mold making machine, characterized in that it includes an elevating and lowering drive device that allows the support member to descend together with the extrusion plate when transmitted.