JPS5941822B2 - Mold removal device for mold making machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mold removal device for a mold making machine.

To take out a mold made by a mold making machine, once the pair of molds are separated, a mold holder for taking out the mold is inserted between them, and the mold extruded by the extrusion device O is inserted into this mold. Normally, the mold is received by a pedestal and moved out of the molding machine to take out the mold.

To take out the mold using this take-out device equipped with a cradle, the cradle is inserted when the pair of molds have finished opening, so additional time is required to take out the mold. As a result, the cycle time for molding becomes longer, which becomes an obstacle to improving productivity.

In addition, since this ejecting device is driven by a drive source O that is separate from the drive source for opening and closing the mold, it requires installation space and equipment costs for the printing part drive source, and it also controls the insertion position, time, etc. This method requires an additional device to perform the process, which increases the overall cost of the device, and it also has drawbacks such as the risk of malfunction.

In addition, if the mold for molding is a horizontally split mold (upper and lower split mold), the mold attached to the upper mold is removed, and the mold is dropped downward with an extrusion device and received on a pedestal. However, there was a problem in that the mold was damaged by the impact of the fall.

To avoid this problem, when the mold is opened, the mold is attached to the lower mold, and it is pushed up with a push-up pin, then the fork,
It is also possible to grip the mold with a chuck mechanism, move it horizontally, and then scrape it out of the molding machine. In addition, due to the need to grip the mold in a well-balanced manner, the chuck mechanism, etc. mentioned above must be made only for a specific mold, that is, it must be dedicated. In order to prevent this, the extrusion stroke has to be made longer, which has the disadvantage of making the equipment taller.

In view of the above circumstances, the present invention provides a mold for making a horizontally split mold, and a mold opening/closing device for opening and closing the mold by linearly raising and lowering at least one of the upper mold and the lower mold of the mold. , a mold making machine O equipped with an extrusion device for separating the mold attached to the upper mold from the upper mold in the mold open state O
In this mold take-out device, the mold cradle uses the mold opening/closing device as a power source to take out the mold in parallel with the mold opening/closing movement, greatly reducing equipment costs and installation space compared to conventional methods. In addition, when the mold attached to the upper mold is removed from the upper mold by the extrusion device, the mold holder is located close to the upper mold, so the falling distance of the mold is short. The purpose of this invention is to provide a mold removal device that can prevent damage to the mold.

The present invention is characterized by a mold holder for receiving the mold removed from the upper mold in the mold open state, and b for opening and closing the mold between the upper mold and the lower mold. During the first half of the mold opening movement and the second half of the mold closing movement, the movable mold that is raised and lowered is in a non-operating state. a first motion conversion mechanism that converts the rotational motion of the rotating member in the forward direction and the reverse direction, respectively; The second part moves in a direction substantially perpendicular to the opening/closing direction, enters between the upper mold and the lower mold during the mold opening movement, and then rises to approach the upper mold 0, which converts into an approach movement and the opposite, an exit movement. and two motion conversion mechanisms.

Note that the terms "first half of the mold opening movement" and "second half of the mold closing movement" here do not in a strict sense indicate whether the position is exactly before or after the center position of the mold opening movement, but broadly refer to the front part of the mold opening movement. Part, shall mean the latter part.

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

In FIG. 1, a bed 1 is fixed to an upper board 4 by a plurality of machine frames 2.3, and together with these, constitutes the main body of the molding machine.

A fixed die plate 6 is fixed on the bed 1, and a fixed die 7, which is a fixed lower die, is detachably attached to the fixed die plate 6.

A movable mold 8, which is an upper mold that can be raised and lowered along a vertical line, is arranged above the fixed mold 7, and when the fixed mold 7 and the movable mold 8 are brought together, a cavity 9 and a cavity 9 are formed inside the movable mold 8.
An air inlet 11 communicating with this is formed.

The movable mold 8 is detachably attached to the movable die plate 12, and the rod 14 of the mold opening/closing cylinder 13 as a mold opening/closing device disposed on the upper plate 4 is fixed to the movable die plate 120. , and can be raised and lowered along with the rod 14.

Figure 1 shows the Rondo yield state.

A blow head 16 for blowing molding sand is arranged on the side of the fixed mold 7 and the movable mold 8, and a gushing head 17 which can be raised and lowered is arranged between them.

The gashing head 17 is pressed against the blowing port 11 and guides the gas for hardening the molding sand into the cavity 9, and the gashing head cylinder 180 is attached to the upper plate 4.
This allows it to be raised and lowered.

The gutting head 17 is also mounted so that it can slide horizontally (in the left-right direction in FIG. 1) with respect to the base 19.

On the bottom side of the upper panel 4, there is a rod 14 movable gou plate 1.
2 and a pair of brackets 2 on both sides of the movable mold 8
1 (only one of which is shown in the figure) is attached to each of the rack guides 22 on each side of this bracket 21.
is fixed.

The rack guide 22 has a fitting groove for guiding that extends in the vertical direction as shown in FIG.
3 is fitted and slidably held at its rear protrusion.

A vertically extending through groove is provided on the rear side of the rack guide 22, and the proximal end hook-shaped portion of the 5-shaped synchronization arm 24 is thrust into this through groove from behind and is fixed to the back surface of the rack 23. The rack 23 is connected to this synchronous arm 2.
4 is raised, so that it also rises by 0.

As shown in FIG. 2, a bolt 27 is screwed into the lower surface of the free end of the synchronizing arm 24 and fixed with a nut 26.

By rotating the bolt 27, the length of the bolt 27 protruding from the synchronizing arm 24 can be adjusted.

An action bracket 28 is located below this bolt 27)
29? Koyori movable die play H2? This is fixed, so that when the movable die plate 12 rises, its rising force is transmitted to the synchronizing lever 241 via the action bracket 28 and the bolt 27.

The upper end of the rack 23 is fastened to a rod 320 having a seat 31, and the seat 31 of the rod 32 has a through hole formed in the upper plate 4 and a bottomed cylindrical member 33 fixedly installed above it.
One end of the spring installed inside is brought into contact,
The return force of the spring 34, which is elastically deformed by the stiffness of the rod 32 being raised together with the synchronization arm 24, is the return force of the rack 23? It is configured to function in this manner.

A stopper portion 35 is formed at the upper end of the rod 32, and this stopper portion 35 comes into contact with the bottom of the cylindrical member to define the lowering limit of the rack 23.

In front of the rack 23 (on the right side in FIG. 1), as shown in FIG.
As shown, a rotating shaft 37 is supported by a bearing 36c attached to the end surface of the bracket 21.

A pinion 38 is fixed to the rotating shaft 37 inside the bearing so as to mesh with the rack 23, and the pinion 38 is rotated by raising and lowering the rack 23.

That is, in this embodiment, the rack 23. Spring 34, stopper portion 35. The pinion 38 and the like constitute a first motion conversion mechanism that converts the motion of the movable mold for opening and closing the mold into the rotational motion of the pinion 38, which is a rotating member.

The rotation of the pinion 38 is transmitted to a rotating arm 41 whose upper end is fixed to a boss portion 39.

The swing arm 41 is made of a longitudinal plate, and a yoke portion 42 is formed at the other end.

The swing arm 41 rotates when the rod 14. The movable die plate 12, the movable die 8, etc. are provided at a position outside their movement trajectory so as not to interfere with them, but a guide rail 43 is provided further outside of the swing arm 41. It is located.

The guide rail 43 has a part that extends in the mold opening/closing direction (vertical direction) due to the movement of the movable mold 8 and a part that extends in a direction perpendicular thereto (horizontal direction), and has a bracket at the upper end of the part that extends in the vertical direction. Along with being fixed at 21,
The other end, that is, the end of the horizontally extending portion is the bed 1
and extends to the outside of the machine frame 2 connecting the ends of the upper board 4.

The guide rail 43 has a pair of guide surfaces facing each other and extending parallel to each other, and a roller 46 attached to an O-roller shaft 44 is disposed between the guide surfaces, and the roller shaft 44 is moved. It seems like I'm going to give you some guidance.

This roller shaft 44 has a yoke portion 4 of the swing arm 41.
2 are engaged, and the roller shaft 44 is connected to the rotating arm 4.
It is moved by one turn.

The roller shaft 44 is fixed to a mold holder 47.

The pedestal 47 is composed of triangular side parts 48 that face each other and a receiving part 49 that connects them at the periphery thereof, and the roller shafts 44 of each top part of this side part 48 are coaxial with each other. In this embodiment, the roller shaft 44. Roller 46, guide rail 43. A second motion conversion mechanism is constituted by the rotating arm 41 and the like to convert the rotational movement of the pinion 38, which is a rotating member, in both forward and reverse directions into the necessary movement of the mold holder 47 for receiving the mold.

Each side portion 48 of the mold holder 47 is symmetrical with respect to its center line so that its center of gravity is located on the center line. A weight 51 (right end in FIG. 1) is attached to urge the pedestal 47 to rotate clockwise in FIG.

A rotation prevention arm 53 is also fixed to the roller shaft 44 and extends in a direction opposite to the weight 51 with respect to the center line of the side portion 48, and a roller 52 is attached to the tip of this arm 53. .

The roller 52 comes into contact with a guide 54 (which acts to prevent the roller shaft 44 from rotating clockwise in FIG. Swinging is prevented by the arm 53 and the weight 51.

The roller guide 54 consists of a portion extending in the horizontal direction (left-right direction in FIG. 1) and a portion extending in the vertical direction, and is fixed to the bracket 21 at one end O of the upper and lower portions.

Both of these two parts are arranged parallel to the guide rail 43, and the horizontal part is arranged above the guide rail 43, and the upper and lower parts are arranged to the left of the guide rail 43, so that they swing when the roller shaft 44 moves. It is configured to guide the prevention roller 52.

Note that by providing another guide having the same configuration as the guide 54 so as to sandwich the roller 52 from above and below, the pedestal 4
It is also possible to prevent the shaking of 7.

Next, the operation of the mold removal device having the Doi configuration will be explained.

First, with the movable mold 8 lowered, the blow head 16 is advanced and pressed against the blowing port 11.

Subsequently, molding sand is blown into the cavity 9 from the blow head 16.

When the blowing is finished, the blow head 16 is moved back, and then the gassing head 17 is lowered by the cylinder 18.

Thereupon, the blower head 16 is moved forward again to press the gashing head 17 against the blowing port 111.

Here, a hardening gas generated by a hardening gas generator (not shown) is blown into the cavity 9 from the gashing head 11 to harden the foundry sand.

When the curing is completed, the blow head 16 is moved back and the gashing head 17 is separated from the blowing port 11 by the return spring 56.

Next, the gutting head 17 is pulled up by the cylinder 18, and the molding process is completed.

Next, when the rod 14 is pulled up by the mold opening/closing cylinder 13, the formed mold bites into the movable mold 8 and rises together with it.

When the action bracket 28 of the movable die plate 12 that rises with the rod 14 comes into contact with the bolt 27t, the lifting force of the movable die plate 12 is transmitted to the synchronization arm 24, and the rack 23 resists the elastic force of the spring 34. be lifted up.

Then, since the pinion 38 meshing with the rack 23 is rotated in the clockwise direction in FIG. 1, the pivot arm 41 is also pivoted in the same direction.

The movement of the swing arm 41 is transmitted to the roller shaft 44c with which the yoke portion 42 of the arm 41 engages, and the roller shaft 44 is moved along the guide rail 43.

As the roller shaft 44 is moved, the pedestal 47 is moved inward from the outside of the machine frame 2 and is inserted between the raised movable mold 8 and the fixed mold 7 that is fixed in position.

As the movable mold 8 rises (the roller shaft 44 is continuously moved, the roller 46 moves to the upper and lower parts O of the guide rail 43).
After reaching this point, it is lifted upwards.

Here, the moving speed of the roller shaft 44 is faster than the moving speed of the rack 23, that is, the rising speed of the movable mold 8 (roller shaft 44
4 is determined by the relationship between the radius of the pinion 38 and the length of the swing arm 41.

In this example, it is set to about 4 times) fixed type 7 and movable type 8
The pedestal 47, which has moved in for a while, quickly catches up with the movable mold 8I which is rising further above it, and when the movable mold 8 reaches top dead center, it catches up to the position directly below it (mold receiving position). In this example, the distance is several Confucian distances).

Then, using an extrusion device (not shown), the mold stuck to the movable mold 8 is extruded and dropped onto the pedestal 47.

At this time, since the mold has fallen only a short distance, the lower part of the mold is hidden in the cavity of the movable mold 8.

Next, when the pulled up rod 14 starts descending,
Since the movable die plate 12 is lowered by p, the rack 23 is lowered together with the movable die plate 12 due to the weight of the rotating arm 41, the mold pedestal 47, the mold, etc., and the elastic force of the spring 34. As a result, the rotating arm 41 of the pinion 38 is rotated, so that the pedestal 47 on which the mold is placed is lowered.

As described above, since the descending speed of the pedestal 47 is faster than that of the movable mold 8, the mold supported by the trowel on the pedestal 470 is gradually pulled out of the cavity of the movable mold 8, and the pedestal 47 is moved to the guide rail 8.
When reaching the transition part from the upper and lower parts of 3 to the horizontal part, O
This results in its upper surface being located below the lower surface of the movable mold 8.

As the rack 23 continues to descend, the horizontal portion of the mold together with the pedestal 47 is moved to the right in FIG.

When the upper end stopper portion 35 of the rod 32 comes into contact with the bottom of the cylindrical member 33, the rack 23 stops descending.
At the same time, the movement of the cradle 47 is also stopped and the mold is taken out.

In this way, in the above device, the pedestal 47 is connected to the mold opening/closing cylinder 13.
Since the device is configured to be driven to enter or exit between the movable mold 8 and the fixed mold 7, a separate drive source for the take-out device is not required. Unlike conventional devices, the space for installing the driving source, the installation cost, and the driving energy are greatly reduced.

In addition, since the opening and closing movements of the mold are mechanically linked to take out the mold, there is no need to provide a separate device to control the entry position of the pedestal, time, etc. Contributes to reducing equipment costs.

Furthermore, the pedestal 47 moves in synchronization with and utilizing the upward stroke of the movable mold 8 from the time when it is opened by the appropriate amount, and receives and holds the mold during the subsequent upward and downward strokes of the movable mold 8. Since it is taken out, cycle time is shortened and productivity is improved.

The take-out device in the above example enters between the movable mold 8 and the fixed mold 7 and then rises to follow the movable mold 8, and its top dead center is a few centimeters directly below the movable mold 8. Therefore, during mold extrusion, the falling distance of the mold is small, and therefore, the risk of damage to the mold is eliminated.

Moreover, the mold holder 47 is excellent in versatility since it can be used for molds of any shape.

In addition, the above-mentioned mold extraction device (in this case, the first motion conversion mechanism converts the motion of the movable mold into the rotational motion of the pinion 38, which is a rotating member, by using motion conversion by the meshing of the rack 23 and the pinion 38. However, it is also possible to use the mechanism shown in FIG. 4 to accomplish this.

In FIG. 4, reference numeral 61 denotes a shaft supported by a stationary member such as a bracket, to which a bell crank 63 is attached.

The bell crank 63 has yoke portions 64 and 66 at both ends, and these yoke portions are connected to a roller shaft 67 and a sliding member 68, respectively.
) is engaged with a protruding working pin 69.

The sliding member 68 corresponds to the rack in the embodiment described above, but does not have an engaging portion.

In this embodiment, the bell crank 63 functions not only as a rotating member but also as a component of both the first and second motion conversion mechanisms.

FIG. 5 shows that a sprocket 74 attached to the same shaft 73 is rotated by the meshing of a rack 71 and a pinion 72, and together with this, another sprocket 76 disposed at a proper position is rotated.
The chain 71 (suspended from the chain 71) is configured so that the pedestal 78 is moved when the chain 77 wound around the chain 71 is moved.

That is, in this embodiment, the sprocket 74.7
6 and chain? ? 4. This constitutes the second motion conversion mechanism.

Although an embodiment in which the present invention is applied to a horizontally split molding machine of the type in which the upper mold moves up and down is shown above, the present invention can be applied in almost the same way to a horizontal split molding machine of the type in which the lower mold moves up and down. .

As described in detail above, the present invention provides a horizontally split mold-making mold, a mold opening/closing device that opens and closes the mold by linearly raising and lowering at least one of an upper mold and a lower mold of the mold, and a mold opening/closing device. A mold ejecting device installed in a mold making machine is equipped with an extrusion device that detaches the mold stuck to the upper mold from the upper mold when the upper mold is stuck to the upper mold. A motion conversion mechanism O is provided that can first change the rotational motion of the rotating member to the rotational motion, and further convert that rotational motion to the motion of the mold holder necessary for taking out the mold,
This eliminates the need for a dedicated drive source to give the mold cradle the motion necessary to take out the mold, as well as a control device to control that drive source, making it possible to reduce equipment costs and installation space. Ta.

Furthermore, in the mold removal device according to the present invention, the mold holder is not only moved between the upper mold and the lower mold from a side position of the mold when the mold is opened, but also raised and brought closer to the upper mold. Therefore, when the mold is separated from the upper mold by the extrusion device, the falling distance to the mold pedestal is shortened, and damage to the mold due to the impact of the fall is avoided.

If the falling distance of the mold is reduced, the upper part of the mold will be located in the upper mold cavity even when supported by the mold holder O, but when the mold is closed, the mold holder will quickly move away. Since the mold is lowered, the mold can be pulled out of the completely open cavity while being supported by the mold holder, and can subsequently be moved in a direction perpendicular to the mold opening/closing direction, without causing any inconvenience.

Moreover, since the movement of the mold holder in the direction parallel to and perpendicular to the mold opening/closing direction is performed by the mold opening/closing movement and the sub-girder, the movement of the mold holder to take out the mold is the same as the movement of the mold opening/closing. This has the effect of shortening the cycle time of the mold making machine, compared to the case of using a normal mold extraction device which is operated separately with a time lag.

[Brief explanation of the drawing]

Fig. 1 is a front view of a mold making machine including a mold extraction device which is an embodiment of the present invention, Fig. 2 is a side view of the main parts of the same device (partial cross section), and Fig. 3 is the same as that shown in Fig. 2. 1-I sectional view, 4th
5 and 5 are diagrams showing the principle of another embodiment of the present invention, respectively. 7...Fixed type, 8...Movable type, 12.
...Movable die plate, 21...Bracket, 22...Rack guide, 23,71.
... Rack, 24 ... Synchronous arm, 38
....Action bracket, 37..Rotating shaft, 38, 72..Pinion, 41..
・Swivel arm, 42, 64, 66... Yoke part, 43... Guide rail, 44, 67...
・Roller shaft, 46...Roller, 47, 78...
... Mold holder, 63 ... Bell crank, 7
4, 76...Sprocket, 77...
chain.

Claims (1)

[Scope of Claims] 1. A horizontally split mold-making mold, a mold opening/closing device that opens and closes the mold by linearly raising and lowering at least one of an upper mold and a lower mold of the mold, and in an open state of the mold. A mold removal device installed in a mold making machine equipped with an extrusion device that removes a mold attached to the upper mold from the upper mold, the mold removal device removing the mold removed from the upper mold in the mold open state. The mold cradle that receives the mold, and the movable mold of the upper mold and the lower mold that is raised and lowered to open and close the mold, are in a non-operating state during the first half of the mold opening movement and the second half of the mold closing movement; a first motion conversion mechanism that converts the mold opening and mold closing motions into forward and reverse rotational motions of a rotating member in the second half and the first half of the mold closing motion, respectively; The rotary movement of the mold holder is moved from a side position of the mold in a direction substantially perpendicular to the opening/closing direction of the mold to enter between the upper mold and the lower mold during the mold opening movement and then rise. and a second motion conversion mechanism that converts the approach motion of the upper mold O into an approach motion and the retraction motion opposite thereto, and the mold is taken out in parallel with the mold opening and closing motion using the mold opening and closing device as a power source. Mold removal device for mold making machine. 2. The movable mold is the upper mold, and the first motion conversion mechanism includes a rack movably disposed in the main body of the mold making machine in a direction parallel to the moving direction of the upper mold; The molding machine includes a spring that biases the rack in a downward direction, a stopper that defines a lower limit of the rack, and a pinion that is rotatably supported by the molding machine body and meshed with the rack and functions as the rotating member. A mold removal device according to claim 1, which comprises: 3. The second motion converting mechanism includes the mold pedestal (a pair of rollers attached by roller shafts with a gap wider than the width of the upper mold), and a main body of the mold making machine on both sides of the upper mold. a pair of guide rails that are fixed and each have a horizontal portion that guides each of the pair of rollers in a direction C perpendicular to the mold opening/closing direction and a vertical portion that guides the pattern mold opening/closing direction in a direction parallel to the mold opening/closing direction; a rotating arm that is fixed to the rotating member and engaged with the roller shaft at a yoke portion at the other end to rotate with the rotation of the rotating member and move the roller along the guide rail; A mold removal device according to claim 1 or 2, which comprises: