JPS601097B2 - Molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding machine in which a squeezing device and a die cutting device are installed on the upper part.

In general, the main parts of a molding machine, such as the squeezing device and the die cutting device, are installed at the bottom, so loose sand, such as when sand is added, tends to enter the damaged and rotating parts of the main parts of the molding machine. This reduced the precision of the molding machine and caused it to malfunction.

In particular, if the precision of the die-cutting device that affects the molding function is poor, the die will be difficult to remove, resulting in mold breakage and rust burrs. As a result, equipment utilization rates and product yields decline, resulting in production problems.
The lower part of the molding machine is especially hard and sand accumulates in various parts, and if cleaning is insufficient or structural consideration is not taken enough to prevent sand accumulation, there is a risk that the lower part of the molding machine will be buried in the sand. Therefore, the influence of dust is a problem that cannot be ignored. In a normal molding machine, the sand input hopper must be placed to avoid the squeezing head that rotates or moves back and forth, so sand must be input from well above the lens frame. For this reason, there is a considerable amount of sand being crushed when sand is added, but it is impossible to completely prevent this. Furthermore, it is almost impossible to uniformly introduce the minimum necessary amount of sand into the coin frame. Despite the above-mentioned disadvantages, general molding machines
Due to the complexity of the structure or design, the main parts of the molding machine, such as the squeezing device and the punching device, are often located at the bottom, as described above. In order to eliminate this drawback, a system was devised in which the main parts of the molding machine, such as the squeegee and die cutter, were placed on the upper part, and the squeegee device and the sand charging hopper were integrally connected and moved back and forth alternately. However, with this method, a very heavy object (several tons for a large frame) must be moved back and forth each time, so it is important to absorb shock and increase the horsepower of the drive device, especially during high-speed molding. The major drawback is that it is complex and expensive. Another disadvantage of this method is that it is difficult to install a filling frame device, which is a conventional means for uniformly filling sand. In addition, there are sand chutes installed on both sides to avoid interference with the sand hopper and squeeze head, but this requires a device to move the chutes so as not to collide with the chutes during squeezing, making the structure complex. There is. In addition, in order to shorten the molding time, the general method of feeding sand into the frame is to store one frame's worth of sand in the sand hopper, open the gate at the top of the frame, and let the sand fall to fill the sand. However, there are various ways to open this gate, such as one-sided opening, double-sided opening, or a method in which several gates are rotated. In any case, when performing squeezing after filling with sand, it is necessary to move the squeezing head to the top of the coin frame and then tighten the sand. Therefore, the molding machine becomes larger and more complicated, and molding time is lost due to the reciprocating time of the squeezing head. In order to solve the above problem, the squeegee head is divided into two parts and can be opened and closed to the left and right, thereby halving the round trip time.When opening, the lens frame is filled with sand through the gap, and after closing, the squeegee head is filled with sand from the bottom. There is also a molding machine that performs tightening.

However, this method requires an opening/closing mechanism for the sand hopper in addition to the opening/closing mechanism for the squeegee head, and its structure makes it impossible to install the main parts such as the squeegee cylinder and die-cutting device on the top. be. The present invention minimizes the damage caused by sand and dust by locating the main parts such as the squeezing device and the die cutting device on the upper part of the molding machine, and makes both the squeezing head and the sand hopper immovable. This eliminates most of the sand spillage during sand charging, enables uniform and flat sand filling, and achieves these effects with a simple structure.

Furthermore, it is an object of the present invention to provide a molding machine that improves molding efficiency through the above effects and improves mold precision, which is an inherent function of the molding machine, to produce high-quality castings. Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, a main body frame 2 is attached to the upper part of the lower frame with bolts, and a molding machine table 3 containing a built-in jolt device (not shown) is attached to the lower part. In this case, when the jolt device is not needed, it serves as a mere stand for fixing the molding machine table 3. Molding machine table 3
A model board 4 is attached on top, and a model 5 is fixed to the model board 4. A guide pin 6 is fixed to the model plate 4 and is positioned in competition with a coin frame 7 having a bush 8. The coin frame 7 is supported by a roller 1 rotatably attached to a roller frame 9. A guide pin 11 is inserted and fixed into the upper part of the roller frame 9, and a filling frame 1 having a guide hole 12 is attached to the guide pin 11.
3 are joined to be slidable in the vertical direction. On the other hand, four guide rods 16 are attached to a guide push 15 fixed to the main body frame 2 so as to be slidable and parallel to each other in the vertical direction. Fix it so that it is horizontal. This levelness is particularly necessary for mold cutting and greatly affects the quality of the casting. Further, the upper portions of the four guide rods 16 are firmly fixed to the tuning plate 14 using nuts 18 so as to be perpendicular to each other. Two more mold cutting cylinders 1
9 is attached to the main body frame 2, and the tip of this rod is connected to the tuning plate 14. In this way, the mold cutting cylinder 1
9 allows the die cutting device consisting of the tuning plate 14, guide rod 16, roller frame 9, and roller 10 to be vertically movable, and by supporting the coin frame 7 on the low-fu frame 9, frame alignment and die cutting are possible. shall be. Further, on the upper part of the main body frame 2, a sand chute 34 is installed in the center through the tuning plate 14, and two squeezing cylinders 20 are installed on both sides thereof. The rod 21 of the squeezer IJ ender 20 is fixed to the upper part of the squeegee head 23 via the end fitting 22. The skies head 23 has a box-shaped structure,
Its bottom part consists of two pressing plates 24. The pressing plate 24 is rotatably installed via a movable plate 26 around a shaft 25 coaxially installed on the side plate of the skies head 23. The upper surface of the press plate and the lower surface of the squeezing head form a cylindrical surface centered on the shaft 25 so as to slide on each other. In FIG. 7, the rack is rotatable around a shaft 25, is fixed to a movable plate 26 so as not to change its relative position, and is toothed on both sides so as to mesh with a pair of pinions 27. 30 is attached to the tip of the rod 29 of the opening/closing cylinder 28. On the other hand, there is a drum 3 at the top of the sand chute 34.
A sand supply device is installed which moves the belt 31 by rotating the belt 31 and supplies mirror sand 33 loaded thereon. In addition, in the present invention, as another sand pouring method, there is a method in which the sand chute 34 and the squeezing cylinder 20 are placed in the center and the sand chute 34 is placed on both sides as shown in FIG. can also be adopted. Next, the operation of the molding machine of the present invention will be explained.

FIGS. 1 and 2 show a state in which sand 33 is fed into the squeegee head 23 from the upper sand supply device, and the flask 7 is moved to a predetermined position on the roller 10 by a conveying device (not shown). One frame of mirror sand is supplied in each cycle. The frame alignment work starts from this state. That is, the rod of the die-cutting cylinder 19 begins to descend, and as a result, the tuning plate 14, the guide rod 16, the roller frame 9, the roller 10, and the empty coin frame 7 on the roller 10 descend vertically, and the bush of the coin frame 7 immediately drops. 8 and the pin 6 of the model plate 4, and while being positioned by this, the bottom surface of the coin frame 7 and the top surface of the model plate 4 come into contact, and the mirror frame 7 and the model 5 are set as shown in FIG. The state will be as follows. At this time, the rod 21 of the squeezing cylinder 20 simultaneously begins to descend. As the die-cutting cylinder 19 continues to descend further, since the mirror frame 7 is set on the model plate 4, only the roller frame 9 descends, and then the upper surface of the coin frame 7 and the lower surface of the filling frame 13 come into contact.
As shown in FIG. 5, the lens frame 7 and the filling frame 13 are set. When the low-foo frame 9 is further lowered slightly, the filling frame 13 is separated from the upper surface of the roller frame 9 and guided by the guide holes 12 and pins 11, as shown in FIG. 6, and the frame alignment work is completed. In addition, during frame alignment work, when the pressing plate 24 fills the rust sand 33 into the coin frame 7, the squeezing head 23 is also lowered to the extent that it does not collide with the filling frame 13 even if the press plate 24 performs a turning operation to reduce the loss time. obtain. Next, when the squeegee head 23, which has completed the frame alignment as described above, stops at a predetermined position, the opening/closing cylinder 28 is actuated by this signal as shown in FIGS. 7 and 8, and the rod 2
9 and the rack 30 at its tip are lowered.

Therefore, the pinion 27 meshed with the rack 30 rotates,
At the same time, the pressing plate 24 opens left and right as shown by the arrow, and the coin sand 33 stored in the squeezing head 23 for one frame falls all at once and is thrown into the coin frame 7. After the mirror sand 33 is thrown in, the opening/closing cylinder 28 operates in reverse and the rod 29 rises. As a result, the press plate 24 rapidly rotates back to its original position and returns to the positional relationship as shown in FIG. Next, the rod 21 of the squeezing cylinder 20 descends again, and the mirror sand 33 in the coin frame 7 is squeezed by the pressing plate 24 of the squeezing head 23, as shown in FIG. If used in combination, the mold clamping effect will be further improved.After the jolt and squeeze are completed, the rods of the squeeze cylinder 20 and the die-cutting cylinder 19 are operated to raise them in the opposite direction, and the coin frame 7, filling frame 13, and squeeze head are The 23 levels are shown in Figure 9.
The die-cutting process is performed in the order shown in FIGS. 6, 5, 4, and 1, and the squeegee's head is raised and returned.

FIG. 4 is a diagram showing the moment when the frame is aligned and the frame is removed at the same time.
While the molded coin frame is conveyed to the next process and the next empty rust frame is sent to the predetermined position of the roller 10, one frame of rust frame 33 is transferred from the upper belt conveyor 31 to the sand chute 34.
One cycle of the molding machine is completed by feeding the squeezing head through the molding machine. This operation can be repeated sequentially. As explained above, the effects of the molding machine of the present invention can be summarized as follows. {1' By making the squeeze head box-shaped, opening and closing the pressure plate, and also serving as a sand charging hopper, it is possible to eliminate the need for a reciprocating device between the squeeze head or the squeeze device and the hopper.

'21 Actually, a frame conveying device (not shown) is required, but since the above-mentioned reciprocating device does not exist, the filling frame can be mounted without interfering with it, and a sand charging hopper (skies) is placed directly above the casting flask. It is now possible to install a head that also serves as a head.
When filling a coin frame with mirror sand from a sand hopper, the sand can be thrown in uniformly and flatly without scattering the mirror sand around.

By installing the main parts such as glue die cutting equipment and squeezing equipment on the top, there is less sand intrusion into the cylinders and sliding parts of these equipment, which reduces wear and tear, extending the service life of the molding machine and preventing breakdowns. rate may also be reduced.

■ Also, since deterioration in mold cutting accuracy can be prevented, high quality castings with less mold breakage, rust, etc. can be produced.

Furthermore, it is also possible to obtain a casting having a draft angle of 4.degree. and having high reproducibility and dimensional accuracy of corners and the like. [5' Main parts such as skies and die cutter are located at the top, making maintenance and inspection easy.

- The lower part of the molding machine is only a jolt device or a piece of material with no moving parts, and the depth of the hem bit of the molding machine can be reduced, so basic costs can be reduced.

'7) Regarding the prevention of jolt noise, compared to the conventional molding machine which has three devices such as squeezing, die cutting and jolt, it is easier to prevent the jolt noise because the jolt device has a stand-alone structure. It can be taken.

'8) Eliminates the need to move the heavy skies head back and forth, reducing molding time.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view showing an embodiment of the present invention, Fig. 2 is a partially sectional side view of the same, Fig. 3 is a main part sectional front view showing another embodiment, and Fig. 4 is a key frame. A sectional view showing the state of overlap with the model plate; FIG. 5 is a sectional view showing the state of contact between the filling frame and the mirror frame;
Fig. 6 is a sectional view showing the state at the end of mold matching, Fig. 7 is a partial sectional view showing the opening/closing mechanism of the press plate, Fig. 8 is a view of the press plate in the open state, and Fig. 9 is the state of the skies. FIG. 3... Molded table, 20... Squeeze cylinder, 21... Rod, 23... Squeeze head, 24
...Press plate, 33...Zensa. Out of the picture, figure 2, figure 3, figure 4, figure 5, figure ok, figure 7, spear a, figure O? figure

Claims (1)

[Claims] 1 A squeezing cylinder was fixedly provided on the upper part, the cylinder and a press plate were connected to each other so that the press plate could move freely downward, and the mold on the fixed table could be squeezed freely, and a die cutting device was installed on the upper part. In the molding machine, a squeeze head having a box-like structure, which had an opening at the top, a rotating press plate at the bottom, and a built-in space for storing casting sand for one frame, was attached to the tip of the rod of the squeeze cylinder. A molding machine characterized by: