JPS6021815B2 - Molding machine with pull-button cylinder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding machine such as a vertical die casting machine having a Brubuck ram cylinder device.

The mold clamping device of vertical injection molding equipment lowers the movable platen using the main ram to align the movable mold and the fixed mold, and when the mold is opened, the movable platen is pulled up using a bullback ram cylinder to close the mold. It's opening.

In a vertical injection molding device having such a structure,
When the movable platen is lowered, it is necessary to lower the movable mold and the fixed mold at a high speed until just before they are brought together, and when the molds are brought together, they must be brought together slowly at a low speed.

If this configuration is not adopted, the movable mold and the fixed mold will collide violently, causing damage to both molds and other parts. Therefore,
Conventionally, while the movable platen was descending, a limit switch was activated and a valve was switched to decelerate, or a hydraulic valve was directly switched to decelerate.

However, if such a structure is adopted, the timing of switching the limit switch is difficult, and sometimes the limit switch is switched once every hour.
On two occasions, the limit switch would not switch. If the limit switch is not switched, the movable mold will collide with the fixed mold at high speed without slowing down, making a loud noise and damaging the mold. Furthermore, considering that the cushioning during mold matching is not effective, high-speed mold clamping cannot be performed sufficiently in order to perform a mold clamping operation on the safe side. Also, when switching from high-speed vertical to low-speed vertical, the speed does not change smoothly, but changes in stages.
It had the disadvantage of generating shock.

On the other hand, in order to eliminate the drawbacks of the control method described above,
The present inventor previously invented a device as shown in FIGS. 1 and 2.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed plate, on which a fixed mold 2 is fixed.

A cylinder platen 3 is arranged above the stationary platen 1, and both are connected by four tie bars 4. A tank 5 is provided at the upper end of the cylinder platen 3, and a main ram 6 for mold clamping is provided inside the cylinder platen 3.
The main ram 6 and the main ram 6 are integrally provided on a movable platen 7. The movable platen 7 is slidably attached to the tie bar 4, and a movable mold 8 is fixed to the lower surface. Reference numeral 9 designates a product extrusion device, and reference numeral 10 designates a pair of bulbach ram cylinder devices provided on the left and right sides for opening molds. By the way, both of the bulbuck ram cylinder devices 10 are configured as shown in an enlarged view in FIG. 2.

That is, the pullback ram cylinder device 10 is assembled based on the hollow pullback cylinder 11. At the lower end of this pullback cylinder 11 there is a constriction part 1 inside.
1a is formed. A plurality of oil drain ports 12 to 16, which are also deceleration boats, are opened in a line in the vertical direction at predetermined intervals facing the constricted portion 11a. Among these 8E oil ports 12 to 16, throttles 17 to 20 are provided in the pipes connected in parallel from the second oil drain port 13 from the bottom to the 9E oil port 16 at the top. . Also,
A check valve 21 is inserted into the piping of the 8E oil port 12 at the lowest stage, and a throttle 22 is provided to bypass this. These pipes arranged in parallel are connected by a single pipe 25 to a hydraulic pressure supply source or a tank (not shown). Inside the pullback cylinder 11, a pullback ram 23 having a gear 23b on its rising portion for rotating and adjusting the stroke is slidably joined.
A part of it extends upward and outward from the pullback cylinder 11, and a ram rod 24 is located inside the pullback cylinder 11.
3 and the pullback cylinder 11, and are iron-coupled with each other.

A female thread 23a is formed on the inner surface of the pull back ram 23, and a male thread 24a formed over a certain length at the upper end of the ram rod 24 is screwed into this. Therefore, by rotating the pullback ram 23, the ramrod 24 and the pullback ram 23 can adjust the above-mentioned screwed state and adjust the relative vertical positional relationship between the two, and can respond to changes in the thickness of the mold to which they are attached. Correspondingly pullback ram 2
3 positions can be adjusted. Here, Gya 23b
, the female screw 23a, the male screw 24a, etc., form a deceleration position adjustment mechanism that adjusts the position of the pullback ram 23 and adjusts the deceleration position when the pullback ram 23 is lowered.
By the way, now, as shown in Fig.
3, and the inner diameter of the constricted portion 11a is also based on the outer diameter of the ramrod 24, the relationship between these is <d,
becomes d2.

The inner diameter of the constricted portion 1 1a is also smaller than the outer ridge d of the pullback ram 23, for example, 0. The inner diameter was made slightly larger as shown in the number side. As the pullback ram 23 descends, the lower end of the pullback ram 23 is connected to the upper oil drain port 16, 15,
14... As the blockage progresses, the amount of oil discharged from the bulbuck ram cylinder 11 gradually decreases, the descending speed of the movable platen 7 gradually slows down, and finally, When the oil drain port 12 is closed by the pull-back clamp 23, the movable platen 7, and therefore the movable mold 8, stop moving down. At this point, if the position of the pullback ram 23 with respect to the ram rod 24 is adjusted in advance so that the movable mold 8 and the fixed mold 2 come into contact, the two molds will be gently matched and will never collide. Never. However, if such a structure is adopted, each pullback ram 23
In order to adjust the thickness of the mold according to the thickness of the mold, the gears 23b formed at the upper end of each pullback ram 23 must be manually turned, which is not only extremely troublesome, but also requires two Gears 23b provided at certain locations
have to be adjusted to exactly the same amount, which is extremely difficult and time consuming depending on the human hand.

If the adjustment positions of the left and right pull-button clamps are even slightly different from each other, the positions at which the left and right cushions start to apply during molding will be slightly different, so only one brake will be applied earlier at the end of mold clamping. , the deceleration operation will lack smoothness. The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional pull-back ram cylinder, and provides a pull-back ram cylinder configured so that the strokes of all pull-back rams can be adjusted extremely easily and reliably by the same amount. The object of the present invention is to provide a molding machine having a device.

In order to achieve the above object, the present invention connects two bullback ram cylinders by piping, and connects only one bullback ram cylinder with
Adopts a structure with a pullback ram and gear for stroke adjustment.

Hereinafter, the present invention will be explained in detail together with embodiments shown in the drawings. FIG. 3 explains one embodiment of the present invention, and in the figure,
Components that are the same as those in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

In this embodiment, only one of the left and right pullbutton rams 23 is provided with a pullback ram deceleration position adjustment mechanism including a gear 23b for stroke adjustment; only,
The pullback cylinder 11 is provided with 9E oil ports 12 to 16, which are also deceleration boats, as shown in FIG.
20, etc. are connected to an oil tank and a hydraulic power source via piping 25.

On the other hand, piping 2 is connected between the two pullback cylinders 11 and 11.
6 and are in a free state, and hydraulic oil can flow from one cylinder to the other cylinder.

In addition, the pullback ram 2 is not provided with the gear 23b.
3 and the ram rod 24 may be fixedly connected,
The pullback cylinder 11 also does not need to be provided with the throttle portion 11a.

Next, the operation of this embodiment configured as above will be explained.

First, during mold assembly, hydraulic oil is supplied from the piping 25 through the check valve 21 into the pullback cylinder 11 on the side where the gear 23b is provided, and then through the piping 26 to the other pullback cylinder 11. The hydraulic pressure is supplied into the cylinder 11, and all the pullback rams 23 are raised simultaneously, the movable platen 7 is raised, and molding is performed.

When the mold continues to ascend, the movable platen 7, ram rod 24, and pullback ram 23 are lowered by the operation of the main ram 6, as described above, and the lower end of the pullback ram 23 is moved from the upper oil drain port to 16, 15, 14, etc.・・・・・・
...and the pullback cylinder 11 starts to become blocked.
The amount of oil discharged from inside gradually decreases, the descending speed of the movable platen 7 gradually slows down, and finally, Enoki E oil port 12
When the movable platen is closed by the pull-button clamp 23, the movable platen stops descending.

When the pullback ram 23 is lowered, the pullback ram 23 is fixed to the ram rod 24 and the gear 23
Since the inside of the pullback cylinder 11 on the side where b is not provided moves via the piping 26 with the inside of the pullback cylinder 11 on the side where the pullback ram 23 is attached to the ram rod 24 so that its position can be adjusted, the inside of the cylinder 11 moves. The pressure is the same on both sides, and the left and right pullback rams 23 are lowered uniformly.

When the height of the mold changes, the downward stroke of the bullbuck ram can be adjusted simply by adjusting the position of the bullbuck ram 23 on the side where the gear 23b is provided.

Note that the adjustable bullback ram cylinder device is
〜The structure shown in FIG. 3 is not limited to the structure shown in FIG.
A structure as shown in the figure can also be used.

In the embodiment shown in FIG. 4, a deceleration position adjustment device 5, which is a type of deceleration position adjustment mechanism for the bullback ram, is installed at the position of the constriction portion 11a formed in the bullback cylinder 11.
0 is set.

The deceleration position adjustment mechanism 50 uses the side wall of the bullback cylinder 11 to align a large number of deceleration boats 27 to 33 formed by penetrating toward the constriction portion 11a in a horizontal state and in one row in the vertical direction. Or provided in two rows. Of course, the fourth
As shown by dotted lines in the figure, a large number of boats 34 may be provided at different levels, not on the same axis, but shifted in the horizontal direction.
The other ends of these boats 27 to 34 are closed to another cylinder hole 35 provided adjacent to the cylinder 11.

An adjustment rod 36 is fitted in the cylinder hole 35 so as to be slidable in the direction of the flywheel. The lower end of the adjustment rod 36 is a threaded shaft 36a, and this threaded shaft 36a is screwed into a nut 37 provided integrally with the lower end of the pullback cylinder 11. It is a square shaft portion 36b that protrudes downward from the shaft, and a rotating means (not shown) is connected to this portion to move the adjustment rod 36 up and down. A plurality of annular grooves 38 are formed on the outer circumferential surface of the upper end of the adjustment rod 36 at a predetermined pitch in the vertical direction.

These annular grooves 38 are arranged in the adjustment rod 3, respectively.
It communicates through a hole 39 of a predetermined depth formed at the upper end of the tube 6 and each through hole 40 . The hole 39 is an 8E oil port 41 formed in the middle of the pullback cylinder 11.
The oil drain port 14 is connected to an oil tank (not shown) to a hydraulic power source.

It should be noted that the pull back ram 23 does not have an adjustment gear above and is integrated with the rod 24.

Next, the operation of this embodiment configured as above will be explained. As shown in FIG. 4, when the adjustment rod 36 reaches the upper end of the cylinder hole 35, the upper two boats 27 and 2 of the boats 27 to 33 indicated by solid lines
8 through the annular groove 38 and the hole 39 at the upper end of the adjustment rod 36
and is in a state where it is conveyed through the through hole 40 to the dummy oil port 41.

In this state, the pullback cylinder 11 and a tank or hydraulic power source (not shown) are in communication only via the boats 27 and 28.

Therefore, when the pullback ram 23 is lowered in this state, the hydraulic oil in the cylinder 11 is discharged only through the boats 27 and 28. Therefore, the pullback ram 23 descends and enters the throttle portion 11a of the cylinder 11.
3 approaches, and as the boats 27 and 28 are blocked in that order, the amount of hydraulic oil discharged from the cylinder 11 gradually decreases, and when the second boat 28 is blocked, there is no flow of hydraulic oil at all, and the pullback ram 23 stops descending, the movable platen, and therefore the movable mold 8 stops descending. If this position is set as the mold clamping position, the molds will be clamped when the fixed mold 2 and the movable mold 8 come into contact, and the molds will not collide with each other. In this way, when the boats 27 and 28 located above perform a deceleration action, when the mold is thick, the pull-button crumb 2
This is the case where the downward stroke of No. 3 is small.

If the thickness of the mold is thin, the adjustment rod 36 is rotated in the direction in which the rod descends so that one of the boats 29 to 33 located below that matches the thickness of the mold is finally blocked. Just adjust it.

That is, the stroke of the pull back ram 23, that is, the speed reducer can be adjusted by simply raising and lowering the adjusting rod 36 of the speed reducing position adjusting device 50 and selecting the position where the speed reducing boat is blocked.

Of course, in this case as well, at least one set of bullback ram cylinder cylinders is provided, but the deceleration position adjustment device 5
0 on one side of the bullback ram cylinder device and the cylinder on the other side of the bullback ram cylinder device are connected by piping, so there is no deceleration position adjustment device 50 on the other cylinder side. Not necessary. In this way, the stroke of the bulbuck ram 23 can be adjusted by simply adjusting the deceleration position adjusting device 50 at one location.
In addition, the stroke can be adjusted by simply raising and lowering the adjustment rod 36, and there is no need to make large adjustments to the pull back ram 23 itself depending on the thickness of the mold, and the amount of upward protrusion of the pull back ram 23 can be reduced. This allows the overall size to be reduced.

In addition, it is safe because the operator does not have to climb up to the top of the vertical molding machine to adjust the stroke like in conventional machines, and the work is done by simply rotating the adjustment rod, so large force is not required. This makes the work easier.

As is clear from the above, according to the present invention, a device for adjusting the deceleration position of the pullback ram is provided in one of the pair of right and left bullback ram cylinder devices, and both bullback ram cylinders are connected by piping. Since it adopts a flat structure, the hydraulic oil in the two pullback cylinders is in a flat state, making it possible to equalize the pressure in both cylinders.

For this reason, the lifting and lowering operations of the pullback ram are performed synchronously, so by adjusting only one adjustment device, it is possible to accurately adjust the mold clamping position according to the height of the mold being used. I can do it. Furthermore, since the stroke only needs to be adjusted at one location, the adjustment is extremely easy and work efficiency is greatly improved. Further, since it is sufficient to provide only one bulbuck ram cylinder device with a position adjusting device, a throttle section, and a large number of deceleration boats, the device becomes simple.

[Brief explanation of drawings]

1 and 2 are a vertical sectional view of a vertical molding device showing a conventional structure and an enlarged sectional view of a bulbuck ram cylinder device part, and FIG. 3 is a longitudinal sectional view of a main part showing an embodiment of the present invention. FIG. 4 is a longitudinal sectional view showing another embodiment of the bulbuck ram cylinder device section of the present invention. 1...Fixed plate, 2...Fixed mold, 3...
...Cylinder platen, 6...Main ram,
7...Movable plate, 8...Movable mold, 10
...Pullback cylinder device, 11...Pullback cylinder, 11a...Aperture section, 12-16, 27-
34...Deceleration port, 17-20, 22...Aperture, 2
3...Pullback ram, 24...Ram rod, 26...
・...Piping, 36...Adjustment rod, 39...
... Hole, 40 ... Through hole, 41 ... Waste oil port, 5
0...Deceleration position adjustment device. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 At least a pair of pull back clam cylinder devices are provided on the left and right, and at least one pull back clam cylinder device is provided with a constricted portion with an inner diameter slightly larger than the outer diameter of the pull back clam at the front part of the pull back cylinder. In a molding machine, a plurality of deceleration ports are arranged in the axial direction of the pullback cylinder in the constriction part, and a pullback cylinder deceleration position adjustment mechanism is provided in the pullback cylinder device having the constriction part and the deceleration port. A molding machine having a pull back cylinder device in which a pull back cylinder provided with a port for use in the pull back and another pull back cylinder are connected through piping.