JPH0213137Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a mold clamping device.

(Conventional technology and its problems) When manufacturing molds for synthetic resin molding, after machining the upper and lower molds, mold alignment and correction work is performed.
After that, the synthetic resin is actually press-fitted into the mold, and the quality of the mold is determined by checking the shape of the molded product, changes in wall thickness, sink marks, etc., and if it is found to be defective, the mold is re-aligned and corrected. , a step of injecting the resin again is taken.

A press machine that combines a try press equipped with a try injection unit on the slide side and a 180-degree reversing device has been known as a means for performing the various operations required for manufacturing the resin molding molds described above.

Figures 5 and 6 show a conventional press machine, in which a slide 4 is slidably arranged on tie rods 3 and 3 installed vertically between the bed 1 and the upper frame 2, and the lower surface of the slide 4 is inverted. A reversing table 9 that can be tilted by a cylinder 10 is arranged, and the reversing table 9
The upper die is attached to the upper die, while a moving bolster 6 for attaching the lower die is arranged on the bed side, and main cylinders 28, 28 for pressurizing the upper and lower die are vertically installed on both sides of the slide 4.

By the way, when the upper and lower molds are brought together and the resin is press-fitted into the cavity and solidified, the injection pressure of the resin into the mold is high, so a mold clamping force is required to prevent the upper and lower molds from separating against this pressure. In addition, in order to take out the molded product from the mold, the stroke S of the mold clamping cylinder is as shown in _FIG . When α ₂ is assumed, S=H+H ₁ =H+H+(α ₁ +α ₂ ). That is, twice the product height and (α
+α). Therefore, in the conventional press machine, the main cylinders 28, 28 for mold clamping are very long as shown in the figure, and there is a problem in that a great deal of time and cost are required to manufacture the cylinders.

Moreover, the long stroke of the cylinder slows down the operating speed, and in order to speed up the operating speed, it is necessary to increase the pump capacity and the output of the electric motor, which poses the problem of making the pump unit large and expensive. Ta.

(Means for solving the problem) The present invention attempts to solve the above problems, and its purpose is to significantly shorten the stroke of the main cylinder for mold clamping, and to It is an object of the present invention to provide a mold clamping device of this type which can simplify manufacturing and make the hydraulic unit compact, and can steplessly adjust die height and reaction force receiving position according to changes in mold height, etc.

In order to achieve the above object, the present invention does not use the main cylinder to raise and lower the upper mold and clamp the mold, but instead builds the main cylinder for mold clamping into the bed (lower table), and lifts and lowers the slide using a push-pull extending from the bed. This is done by a cylinder, and the reaction force applied to the upper mold during mold clamping is caused by the cooperation of a movable lock block installed on the slide and a vertical member from the upper frame. be.

In other words, the feature of the present invention is that a movable slide is disposed on a tie rod installed vertically between the bed and the upper frame, and a reversible upper mold table and an injection or injection machine are mounted on the slide. A moving bolster for attaching the lower mold is arranged on the side so that it can be moved in and out.The bed has a built-in main cylinder for mold clamping that raises the lower mold together with the moving bolster, and a push-up cylinder for moving the slide is installed. The slide has a vertical shaft that can be raised and lowered synchronously by a drive mechanism on at least the left and right sides, and the slide has a surface that receives a reaction force that is interposed between the upper surface of the shaft and the lower end surface of the shaft, and a surface that receives a reaction force, and In this case, a lock block provided with a window hole through which the shaft body passes, and a moving mechanism for moving the lock block are provided.

[Effect]

The upper and lower molds are carried into the press by a moving bolster, the upper mold is attached to a table, and the molds are aligned by the operation of a push-up cylinder.The moving bolster is moved outside the press and the table is reversed to make the upper and lower molds on the same plane. Corrections will be made on top.

Furthermore, when performing trial injection molding, the shaft bodies are synchronously raised and lowered by driving the drive mechanism. At this time, the window hole in the lock block allows the shaft to move freely, so the slide position is set according to the height of the mold and the tightening allowance. When the slide is lowered by the push-up cylinder, if the lock block is advanced by the moving mechanism, the lower end surface of the shaft will come into contact with the lock block.In this state, if the main mold clamping cylinder on the bed side is operated, the moving bolster will be lifted and the lower mold is clamped with the upper mold. The reaction force applied to the slide at this time is firmly received by the shaft body via the lock block, and appropriate trial injection molding is performed.

(Example) Examples of the present invention will be described below with reference to the accompanying drawings.

1 to 4 show an embodiment of the mold clamping device according to the present invention, in which 1 is a bed (lower frame), 2 is an upper frame, and 3 and 3 are 4 connecting the bed 1 and the upper frame 2. book tie rod,
Reference numeral 4 denotes a slide that extends vertically through the tie rods 3, 3 with its sides, and a table 9 for attaching the upper die A is disposed on the lower surface of the slide. It's becoming possible. That is, the table 9 is pivoted to the slide 4 with a pivot 90 at one end, and the reversing cylinder 10 has an intermediate portion attached to the slide 4 as shown in FIG.
It has a piston rod 100 that extends downward and is provided with a hook-like metal fitting 101 at the tip of the piston rod 100, which engages with a pin member 92 fixed to the back of the table 9 via a bracket. ing. Therefore, when the reversing cylinder 10 is moved backward from the state shown by the imaginary line in FIG. and is fixed to the bottom of the slide.

Reference numeral 5 denotes a moving path extending horizontally from the end of the bed 1, and is made of something like a rail material. Reference numeral 6 denotes a moving bolster to which the lower die B is attached, and is movable between the bed 1 and the moving path by means of a transfer device 7. Reference numeral 8 denotes an ejector cylinder provided in the moving path 5, which has an ejector pin 81 for ejecting the tri-molded product from the lower die B. 14
is slide 4 injection or injection machine, nozzle 1
For example, molten resin is press-fitted into the cavity between the upper mold A and the lower mold combined therewith by 41.

The above structure is similar to the conventional mold clamping device of this type, but the present invention first has an upper mold A and a lower mold B.
The mold clamping main cylinder 12 is buried in the bed 1,
By protruding the main ram 121, the lower die B together with the moving bolster 6 is raised, and in order to raise and lower the slide 4, a push-up cylinder with the tip of a piston rod 131 connected to the slide 4 is installed on the upper side of the bed. 13, 13 are provided.

By providing the mold clamping cylinder 12 on the bed side as described above, the stroke required for pressurization becomes extremely short. However, with only this structure, the push-up cylinders 13, 13
However, since the upper mold A cannot withstand the high pressure of the main mold clamping cylinder 12, the upper mold A rises, making it impossible to obtain the necessary mold clamping force.

Therefore, in the present invention, a lock block 15 is disposed on the slide 4, and this lock block 15 cooperates with the vertical member 17 descending from the upper frame 2 to receive the reaction force due to pressurization of the main mold clamping cylinder 12 when it is operated. A moving mechanism 16 is provided to prevent the movement of the slide 4 from becoming an obstacle to the movement up and down of the slide 4.

3 and 4 show one embodiment of the same, and in this embodiment, the vertical member 17 is configured as a shaft, particularly a screw shaft 17a, and one each is arranged on at least the left and right sides of the upper frame 2. , is capable of vertical movement in synchronization with the upper frame 2.

To be more specific, the shaft body (hereinafter referred to as the screw shaft according to the embodiment) 17a is screwed into a female threaded body 18 in a hole penetrated through the upper frame 2, and there is a screw shaft at the center of the screw shaft 17a. Keyed rotating shaft 1
9 is interpolated. A reversibly rotatable drive mechanism 20 such as an electric motor or a hydraulic motor, and a common shaft 21 rotated by the drive mechanism 20 are disposed on the upper frame 2, and the tip of the common shaft 21 and the rotating shaft 19
and are connected by a gear mechanism 22.

On the other hand, the lock block 15 is slidably mounted on guide blocks 23, 23 fixed to the upper surface of the slide 4, and the screw shaft 17a is attached to the upper surface of the guide block 23, 23.
A window hole 24 is provided at a predetermined position to allow the screw shaft 17a to pass through when the slide is raised and lowered, and a hole for receiving the screw shaft 17a is provided in the slide at the corresponding position. The portion 41 is recessed. In the embodiment, the moving mechanism 16 uses a drive cylinder, and a piston rod 161 is connected to the lock block 15.

In the other drawings, reference numeral 27 denotes a pair of left and right table guide rails fixed to the moving path 5, which have trajectory surfaces that come into contact with and guide rollers 91 attached to the table 9.

(Function of the embodiment) Since the present invention has the above-described configuration, when modifying the mold for resin molding and performing trial molding, the upper mold A and the lower mold B are set on the moving bolster 6. Then, move to the bed 1, lower the slide 4, and set the upper mold A on the table 9 of the slide 4.

Then, after operating the push-up cylinders 13, 13 to raise the slide 4, the push-up cylinder 1
3 and 13, the slide 4 is lowered to perform mold matching.

After matching the molds, to perform correction, the slide 4 is raised and the moving bolster 6 is moved along the movement path 5 to the center position of the eject cylinder 8. Then, table 9 is turned over 180 degrees. In the illustrated example, the table 9 is reversed to a position of 90°+α° by the reversing cylinder 10, and the slide itself is lowered in this state, so that the roller 91 at the tip of the table 9 is moved toward the table guide rail 27.
The table 9 is turned over 180 degrees and becomes horizontal, and the upper die A is also turned over 180 degrees and the upper mold
The lower molds are lined up on a flat surface. Therefore, mold correction can be easily performed on the same plane by working downward.

After the mold processing is completed as described above, in order to actually perform resin molding, first, the table 9 is
is reversed and fixed to the lower surface of the slide 4 by an operation opposite to that described above, and the moving bolster 6 is pulled into a predetermined position within the bed 1 and stopped.

Next, in the case of the embodiments shown in FIGS. 3 and 4, the position of the slide 4 is adjusted by raising and lowering the screw shaft 17a according to the height H including the height of the mold and the interference necessary for pressurization. Set. In the illustrated example, the drive mechanism 20 connects the common shaft 21 to the gear mechanism 2.
2, the rotary shaft 19 can be rotated through the screw shaft 17a, whereby each screw shaft 17a can be raised and lowered by the same amount, and the balance of the slide can therefore be accurately maintained.

At this time, the lock block 15 is moved so that the window hole 24 is located in the axial direction of the screw shaft.
Since the passage of the slide 4 is allowed, there is no problem in raising and lowering the slide 4. If the moving mechanism 16 is activated when the slide 4 is lowered to the mold clamping and pressurizing position by the push-up cylinders 13, 13, the lock block 15 is moved to the point Q where the window hole 24 is not present.

In this state, when the mold clamping main cylinder 12 is operated next, the main ram 121 pushes up the moving bolster 6, so that the lower mold B also rises, and mold clamping pressurization is performed. At this time, the upper mold A and the slide 4 are supported from the back side by the screw shaft 17a and the lock block 15, so that they can stably receive the reaction force caused by the pressurization of the main cylinder 12 for mold clamping. A very small stroke of the main cylinder 12 is sufficient. When the present inventor actually manufactured a 600 ton press, it was found that the conventional main cylinder for clamping required a stroke of 800 mm.
In the present invention, it was confirmed that only 2 to 3 mm is sufficient.

Then, in this state, proper resin molding is performed by operating the injection or injection machine 14 to press fit resin into the cavities of the upper and lower molds.

After the resin has solidified, the mold clamping main cylinder 12
The pressure on the cylinder 1 is released, and then the moving mechanism 16 moves the lock block 15 so that the window hole 24 corresponds to the screw shaft.
3 and 13 to raise the slide 4. Then, the lower die B is moved to the center of the eject cylinder 8 by the moving bolster 6, and the eject pin is projected. As a result, the molded product remaining in the lower mold B is taken out, and the shape, wall thickness, presence or absence of sink marks, etc. of the molded product are checked to determine whether the mold is good or not. , you can make corrections and try injecting the resin again.

The present invention can be applied not only to resin molds but also to molds and casting molds for plastic materials such as rubber glass, for matching, modifying, and trying out molds.

(Effects of the Present Invention) According to the present invention described above, the slide 4 is movably disposed on the tie rod 3 vertically installed between the bed 1 and the upper frame 2, and the upper mold table 9 is reversible on the slide 4. A mold clamping main cylinder 12 that raises the lower mold B along with the moving bolster onto the bed 1 is equipped with an injection or injection machine 14, and a moving bolster 6 for attaching the lower mold to the bed side is arranged so as to be movable in and out. In addition, push-up cylinders 13, 13 for moving the slide 4 are provided, and shaft bodies 17a, 17a that can be raised and lowered synchronously by a drive mechanism 20 are vertically disposed on at least the left and right sides of the upper frame 2. , a lock block 15 having a surface interposed between the upper surface thereof and the lower end surfaces of the shaft bodies 17a, 17a to receive a reaction force, and a window hole 24 on the side thereof, through which the shaft bodies 17a, 17a can pass; , and the moving mechanism 16 that moves this, in addition to the basic effect of smoothly performing the mold matching and mold correction necessary when manufacturing resin molding molds, etc., the slide 4 can be moved against the downward force of the push-up cylinder 13. The lower mold B together with the moving bolster is installed in the mold clamping main cylinder 12 buried in the bed side.
In order to obtain mold clamping force by increasing It is possible to achieve appropriate efficiency and energy savings.

Moreover, the reaction force applied to the slide 4 from the bed side can be received from behind by the lock block 15 and the shaft bodies 17a, 17a.
Since a and 17a can be raised and lowered synchronously by the drive mechanism 20, the die height and the corresponding reaction force receiving position can be adjusted steplessly. The excellent effect of being able to receive force reliably and stably and performing appropriate try forming is achieved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the mold clamping device according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a sectional view showing an example of the lock block mechanism, and FIG.
The figure is also a plan view, Figure 5 is a side view of a conventional stopper press, and Figure 6 is a front view thereof.
FIG. 7 is an explanatory diagram showing the height required for taking out the molded product. 1...Bed, 2...Upper frame, 3...Tie rod, 4...Slide, 6...Moving bolster, 9...Table for upper mold, 12...Main cylinder for mold clamping, 13...Pushing cylinder, 14
... Injection or injection machine, 15 ... Lock block, 16 ... Movement mechanism, 17a ... Shaft body, 20 ...
...Drive mechanism, 24...Window hole.

Claims (1)

[Scope of utility model registration request] A slide 4 is movably disposed on a tie rod 3 installed vertically between the bed 1 and the upper frame 2, and a reversible upper mold table 9 and a pouring or injection machine 14 are mounted on the slide 4. In a structure in which a moving bolster 6 for attaching a lower mold is arranged to be freely movable inward and outward, a main mold clamping cylinder 12 for raising the lower mold B together with the moving bolster is built into the bed 1, and push-up cylinders 13, 13 for moving the slides 4 are incorporated. The upper frame 2 is provided with vertical shafts 17a, 17a, which can be raised and lowered synchronously by a drive mechanism 20, at least on the left and right sides, and the slide 4 is provided with shafts 17a, 17a, which can be raised and lowered synchronously by a drive mechanism 20.
a lock block 15 having a surface interposed between the lower end surfaces of the shafts 17a and 17a to receive a reaction force, and a window hole 24 on the side of the surface that allows the shafts 17a and 17a to pass through;
A mold clamping device characterized by being provided with a moving mechanism 16 for moving the mold clamping device.