JPH0477646B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention applies to vertical molding machines such as compression molding machines, injection molding machines, and die-casting machines that have a vertical pressure operation direction, in which a mold is attached and pressure is applied. The present invention relates to a mold opening/closing and moving method in a vertical molding machine that positions a mold member consisting of only a mold or a mold that is taken in and out of the interior of the machine to a pressurizing section.

[Prior Art] Plastic molding machines such as injection molding machines and compression molding machines, and molding machines such as die casting machines for metal casting, differ depending on whether the pressure operation direction is vertical or horizontal. It is roughly divided into vertical molding machines and horizontal molding machines. Of these, vertical molding machines further move a lower mold up and down relative to a fixed upper mold to clamp and open the mold. In addition, there is a method in which the upper mold is moved up and down relative to a fixed lower mold to clamp and open the mold.

The large vertical molding machine is equipped with a bolster that is slightly larger than the mold and can move freely in the horizontal direction. During molding, the lower mold is fixed to this bolster and the machine moves directly under the upper mold. The mold is clamped by raising the bolster hydraulically or by lowering the upper mold. In addition, a compression molding machine fills powdered resin into the lower mold and performs pressure molding. In this type of molding machine, two sets of bolsters are provided, and during molding work, the The mold is prepared by filling it with resin.

The bolster that secures the mold in this way and enters the pressurizing section is generally connected to a pull-out wheel that is driven by a hydraulic cylinder to move forward and backward, and is often driven by rolling wheels. After stopping on the movable platen, it rises together with the movable platen, and mold clamping and molding are performed between the lower mold on the bolster and the upper mold on the fixed platen side. Since the bolster stopped on the movable platen in this way rises as it is and clamps the mold, it is necessary to accurately position and stop the bolster at the stop position. Therefore, in the past, a stopper was provided to regulate the limit of movement, but since a general stopper cannot be used with the above-described two sets of bolsters on both sides, a limit switch was provided for positioning.

[Problems to be Solved by the Invention] However, in such a conventional bolster positioning device, it is difficult to perform positioning by combining the stroke restriction of the hydraulic cylinder and the restriction by the limit switch, and accurate positioning may not be possible. It was taking a long time.
Therefore, in compression molding machines, the upper mold is overlapped and fitted onto the lower mold at the resin filling position, and then the upper mold is inserted into the pressurizing section to perform molding. In order to overlap and align the two upper molds, the upper mold must be lifted up with a crane, which not only takes a long time and is not safe, but also allows the upper mold to
The disadvantage was that it required multiple sets, which increased costs.

In order to solve such problems, the present inventor proposed a method for connecting the drive device for advancing and retracting the bolster and the bolster by an inverted U-shaped member that can be attached and detached in the vertical direction and an engagement member for this. Invented a device formed with a flange member.

However, after moving the drive device forward and stopping the bolster at a predetermined position on the movable platen, the movable platen is raised, the bolster and the lower mold are raised, and the mold is clamped.
After molding, when lowering the movable platen, lowering the bolster and lower mold, and positioning the inverted U-shaped member attached to the bolster around the flange member connected to the drive device, a part of the inverted U-shaped member may If it came into contact with a part of the flange member, there was a risk that the inverted U-shaped member or the flange member would be damaged or twisted.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a system that includes a movable platen that is removably connected to the drive device side by a connecting member and that is movable up and down. A lower mold member that enters into a predetermined position is provided, an upper mold is provided above the predetermined position, and the connecting member between the lower mold member side and the drive device side is vertically removably fitted to each other. , and is provided integrally with the lower mold member,
An inverted U-shaped member having a groove that opens downward and has a predetermined inner width dimension in the horizontal advancing and retreating direction in which the lower mold member advances and retreats on the movable platen, and the horizontal advancing and retreating of the groove of this inverted U-shaped member. Using a vertical molding machine formed with a flange member on the driving device side having a thickness thinner than the inner surface width dimension in the direction, the lower mold member is driven by the driving device and stopped slightly before the predetermined position, Operate the pusher to push the inner surfaces of the groove of the inverted U-shaped member to a predetermined position where they are separated from both outer surfaces of the flange member in the horizontal direction, and then raise the lower mold member together with the movable platen. Press onto the upper mold,
After molding, lower the lower mold member with the pusher retracted so that both inner surfaces of the groove of the inverted U-shaped member in the horizontal direction do not touch the outside of the flange member in the horizontal direction. An inverted U-shaped member was positioned around the flange member, and then the flange member was moved to move the lower mold member from above the movable platen to outside the machine.

[Operation] With this configuration, when the drive device is stopped when the lower mold member reaches the predetermined position, the gap between the rear surface of the groove of the inverted U-shaped member of the connecting member and the rear surface of the flange member is removed. The lower mold member stops with the clearance shifted toward the drive device, so when the pusher is continued to move forward with the drive means, the lower mold member is positioned at a predetermined position and stops, and the groove of the connecting member is moved forward. The clearance between the front and rear inner surfaces of the flange member and the front and rear outer surfaces of the flange member is distributed between the drive device side and the movable platen side, making attachment and detachment easy.

In other words, in the connecting member in the position pushed by the pusher, there is an appropriate gap between both inner surfaces of the groove of the inverted U-shaped member on the lower mold member side and both surfaces of the flange member on the drive device side. Therefore, if the lower mold member is raised in this state, the customer U-shaped member will not rise while in contact with the flange member.
If it rises smoothly with little resistance, and then lowers the lower mold member in that state, the inverted U-shaped member will not hit the flange member, so the inverted U-shaped member and the flange member will not be damaged. , without twisting, the inverted U-shaped member descends smoothly and reliably around the flange member.

[Example] Figures 1 to 6 show an example of an apparatus for implementing the present invention, and Figure 1 is a plan view of the vicinity of the lower mold member of a compression molding machine in which this is implemented, and Figure 2 is a plan view of the vicinity of the lower mold member. is also a front view, Figure 3 is a front view of the positioning device section,
FIG. 4 is an explanatory diagram of the operation, FIG. 5 is a front view of the compression molding machine, and FIG. 6 is a plan view. In the figure, a molding machine main body, generally designated by reference numeral 2, is erected on a step provided in a pit 1 below the floor surface, with a main ram 3 at its lower end inserted into a hole in the pit 1. The molding machine main body 2 is formed of a cylinder platen 4 that supports a main ram 3, a top platen 5 at the top, and a pair of front and rear side plates 6 that vertically connect these platens 4 and 5. A pair of side cylinders 7 are disposed on the left and right sides of the main ram 3, and a hydraulic device 8 disposed in the pit 1 connects the main ram 3, the side cylinders 7, and other hydraulic cylinders to be described later.
Oil is pumped by.

As shown in detail in FIG. 1, the reference numeral 9 is a moving platen as a movable platen having a substantially square shape in plan view and whose four corners are slidably supported by side plates 6. It is connected to a piston rod with the plate 6, and is configured to be raised and lowered at low speed by a main ram 3 with a large output, and at high speed by a side cylinder 7 with a small output. A portion of the configuration of the moving platen 9 will be explained in detail later.

On the other hand, rail stands 10 are respectively erected on the left and right floor surfaces of the molding machine main body 2, and between each rail stand 10 and the molding machine main body 2, two rails 11 are provided at the front and rear. The moving platen 9 is supported at a height such that its upper surface is flush with the moving platen 9 in the lowered position. Reference numeral 12 denotes a framework-shaped bolster pull-out car that is arranged one set on each of the left and right rails 11, and has four wheels 13 that roll on the rails 11.
The working end of a piston rod 15 of a hydraulic cylinder 14 supported on the floor via a bracket is connected to the center of the truck via a bracket 16. By moving the piston rod 15 of the hydraulic cylinder 14 forward and backward using oil supplied from the hydraulic system 8, the bolster pull-out wheel 12 is configured to run over substantially the entire length of the rail 11. A pair of docking pins 17 as connecting fittings having a flange member 17 are horizontally protruded from the front end surface of the bolster pull-out wheel 12 toward a bolster 18, which will be described below.

What is indicated by the reference numeral 18 is a bolster pull-out wheel 12.
This is a bolster that is connected to and runs integrally with the center part of the rail 11 and directly above the moving platen 9, and is formed in a square shape with approximately the same size as the moving platen 9. An inverted U-shaped member 19, which is a pair of connecting fittings, is protruded from the end face on the pull-out wheel 12 side in correspondence with the docking pin 17. This inverted U-shaped member 19
is formed in an inverted U-shape with a groove 19b that opens downward when viewed from the front, and the drawer wheel 12
The side member is provided with a U-shaped groove 19a that opens downward. However, as shown in FIGS. 3 and 4 a and b, the position of the ceiling of the groove 19b is
It is higher than the ceiling of 9a. A docking pin 17 is located in the groove 19b of the inverted U-shaped member 19.
The flange member 17a of is engaged, and
The small diameter portion 17b of the docking pin 17 is engaged in the U-shaped groove 19a, and the inverted U-shaped member 19 is formed to be detachable from the docking pin 17 in the vertical direction. The flange member 17a is located between both inner surfaces of the groove 19b of the inverted U-shaped member 19 in the horizontal movement direction where the lower mold member advances and retreats on the movable platen 9 and both outer surfaces of the flange member 17a in the horizontal movement direction.
When the bolster 18 is pressed, the symbol t in Fig. 4a is
For example, a clearance of about 30 mm is formed as shown by 1. Here, the bolster 18 constitutes a lower mold member together with the lower mold, and the inverted U-shaped member 19 and the flange member 17a constitute a connecting member. Wheels 20 are mounted on four bearings integrally formed on the lower surface of the bolster 18 connected in this way.
are supported at the same intervals as the wheels 13 of the bolster pull-out car 12, and the lower end of the peripheral surface of each wheel 20 is lower than the lower surface of the bolster 18 by, for example, about 15 mm. It floats above the upper surface of a certain rail 11 and moving platen 9. A pair of rails 21 are buried in the upper surface of the bolster 18 so as to be flush with the upper surface thereof, are made of a material harder than the bolster 18, and are arranged in parallel at the same distance as the wheels 20. Further, on the upper surface of the moving platen 9, a guide groove 22 having a V-shaped cross section is provided extending left and right from the center between the rails 21, and a separate pair of protrusions 23 are provided on the lower surface of the bolster 18. This guide groove 2
By engaging with 2, the running of the bolster 18 on the moving platen 9 is guided, and the positioning in the front and back direction when stopped is configured. In addition, the protrusion 23 and the guide groove 2
2, a play gap of, for example, several mm is provided.

Next, a device for positioning the bolster 18 in the left-right direction that stops on the moving platen 9 will be described. The moving platen 9, which is the working surface of the side cylinder 7 shown in FIG. 2, is fixed to the left and right protruding brackets 24 (in FIGS. 1 and 2, only one side is shown and the other side is omitted). A hydraulic cylinder 26 is pivotally mounted on the cylinder bracket 25, and the working end of a piston rod 27 that moves diagonally upward and back is formed into a U-shape when viewed from above, so as to sandwich the hydraulic cylinder 26. Stopper frame 2 extending diagonally downward
8 is pivotally connected with pin 29. One end of a pair of links 30 is pivotally connected to the bracket 24, and the other ends of a pair of links 30 are pivotally connected to the stopper frame 28, and as the piston rod 27 moves back and forth, the stopper frame 28 and the links 30 are connected to each other. The four-bar link movement and the swinging of the hydraulic cylinder 26 are combined to move the vertical pressing surface of the pusher 28a integrally formed on the upper end of the stopper frame 28 to the position away from the bolster 18 shown in FIG. 4a and in FIG. and the fourth
It is configured to move diagonally forward and backward in the vertical direction between the position where the protrusion 23 of the bolster 18 shown in Fig. b is pressed. The bolster 18, which is connected to the bolster pull-out vehicle 12 and enters the moving platen 9, is stopped, for example, 15 mm before the normal stop position shown in FIG. is spaced apart from the protrusion 23, and the clearance t1 between the outer surface of the flange member 17a in the horizontal movement direction and the inner surface of the groove 19b in the horizontal movement direction is biased toward the pull-out wheel 12 side. In this state, the hydraulic cylinder 26 continues to operate to move the pusher 28a diagonally upward, and
3 by 15 mm, for example, to move the bolster 18 to a normal stop position and stop it there. At this time, since the docking pin 17 is stopped, the clearance t1 between the inner surface of the groove 19b of the connecting fitting 19 in the horizontal direction and the outer surface of the flange member 17a in the horizontal direction is
A is divided into, for example, 15 mm each, resulting in the play shown by reference numeral t2 in FIGS. 3 and 4b.

A lower mold is fixed in advance to the bolster 18, which is moved forward and backward and positioned in this manner, in the retracted position shown on the right side of FIGS. 5 and 6. That is, on the upper surface of the bolster 18, four rectangular grooves 31 extend from the center of each side of the square toward the center, and within each groove 31, a positioning metal fitting 32 is placed for accurate positioning. It is installed protrudingly. On the other hand, the lower mold shown by reference numeral 33 in FIG.
3b and a plurality of bottom plate holders 34 supporting the bottom plate 33b, it is formed into a box shape, and is positioned by engaging the positioning metal fittings 32 with vertical grooves 33d provided at the center of each side. Afterwards, it is fixed to the bolster 18 with a plurality of bolts. In the case of this embodiment, the lower mold 33 contains, for example,
It is filled with powder 34 of polytetrafluoroethylene resin. 35 is a T-slot for fixing a lower mold of a different size. On the other hand, an upper mold 36 is fixed to the lower surface of the top platen 5 so as to face the lower mold 33, and by raising the lower mold 33, the upper mold 36 moves into the outer frame of the lower mold 33. The powder 34 is press-fitted into the bottom plate 32a and compressed into the powder 34 between the bottom plate 33b and the bottom plate 33b. In addition, both molds 3
In order to easily and accurately fit 3 and 36, the upper mold 36 is divided into a lower member and a lower member, and the lower member is suspended from the upper member by a hanging bolt and can be moved in small amounts in each horizontal direction. It is formed like this.

The moving platen 9 that stops the bolster 18 at a predetermined position has a circular hole 37 passing through the top and bottom of the moving platen 9.
are located directly below the wheels 20 of the bolster 18 that stops at the forming position, and a lifting rod 38 is supported in each circular hole 37 so as to be able to move up and down. This lifting rod 38 is connected to the bolster 18.
When seated, both are seated and support the wheels 20, and the lower surface of the bolster 18 floats above the upper surface of the moving platen 9. However, when the moving platen 9 rises, the elevating rod 38 lowers slightly due to its own weight. The wheel 20 is embedded in the circular hole 37, and the moving platen 9 and the bolster 18 are configured to rise together in close contact with each other.

The moving platen 9, which has risen in this way and finished mold clamping and molding, is lowered by the drive of the side cylinder 7 and is seated on the upper surface of the cylinder platen 4.
At this time, the docking pin 17 remains in its original position and is engaged with the connecting fitting 19 of the bolster 18, so that the bolster 18 and the bolster pull-out wheel 12 are connected. Then, as shown in FIG. 5, the bolster 18 is pulled out to the center of the rail 11 by the bolster pull-out wheel 12, but at the same position on the opposite side from this position, there is a molded product in the lower mold 33. Knocking devices 39 for pushing out are provided respectively. The knotting device 39 is composed of a hydraulic cylinder 40, a knotting frame 42 fixed to the working end of the piston rod 41, and push rods 43 erected at its four corners.
A hole 44 into which a push-out rod 43 is inserted is bored. When the piston rod 41 moves forward, the push rod 43 protrudes from the hole 44 via the knocking frame 42, and the bottom plate 33 of the lower mold 33
Extrude the molded product together with b.

The operation of the compression molding machine configured as above will be explained. Prior to the molding operation, the lower mold 33 is placed from directly above on the bolster 18 located on the right side in Figs. Bolster 18 with bolts
Fixed to. After filling the lower mold 33 with a powder 34 of, for example, polytetrafluoroethylene resin, the piston rod 1 of the hydraulic cylinder 14 is
5 is moved forward, the bolster pull-out wheel 12 and the bolster 18 connected thereto move forward by rolling the wheels 13 and 20, and the bolster 18 is guided by the engagement between the protrusion 23 and the guide groove 22. Enter above the moving platen 9. When the bolster 18 reaches, for example, 15 mm before the normal stop position, the hydraulic cylinder 14 stops and the bolster 18 stops.
At this time, the flange member 1 of the knotting pin 17
7a is pushing the inverted U-shaped member 19, so the fourth
As shown in Figure a, for example, the clearance t1 = 30 mm is biased towards the bolster pull-out wheel 12 side. Also, the pusher 28a of the stopper frame 28 is connected to the bolster 18.
It is spaced apart from the protrusion 23 of. At the same time as the bolster 18 stops at the temporary stop position, the hydraulic cylinders 2 on both sides
6 operates and the piston rod 27 moves forward, so that the link movement of the stopper frame 28 moves the pusher 28a from the position shown in FIG. 4a to the fourth position.
Protrusion 23 moves forward diagonally upward to the position shown in Figure b.
is pressed to advance the bolster 18 by, for example, 15 mm to the normal stop position, and the bolster 18 is accurately positioned by being held by the pushers 28a on both sides. During this 15mm extrusion, the bolster puller car 12
is stopped and the docking pin 17 at the connection part with the bolster 18 is stopped, so the clearance t1 of, for example, 30 mm provided between the flange member 17a and the groove 19b of the inverted U-shaped member 19 is , code t2
As shown in , 15 mm is distributed on both sides of the flange member 17a. Therefore, even if the bolster 18 rises upward together with the lower mold 33 in this state, the inverted U-shaped member 19, which is a connecting member that is integrated with the bolster 18, will not come into contact with the fixed flange member 17a. There is no problem, so it rises smoothly. Note that when the bolster 18 enters, the lifting rod 38 is seated and its upper end surface is flush with the upper surface of the moving platen 9, that is, the upper surface of the rail 21, so that traveling is performed smoothly and the wheels 20 is supported by the lifting rod 38 and stops.

Therefore, when the sat cylinder 7 is operated to raise the moving platen 9 via the bracket 24, the elevating rod 38 will be slightly lowered until its descent is restricted at the step.
The moving platen 9 and the bolster 18 come into close contact with each other and rise integrally. When the lower mold 33 comes into contact with the upper mold 36 due to the rise, both molds 3
3 and 36 are misaligned, the upper mold 3
Since the lower member 6 is suspended by a hanging bolt, it moves slightly in the horizontal direction and is fitted into the lower mold 33 while being positioned.As the lower mold 33 further rises, the powder 34 is transferred to the upper mold 36. and lower mold 33
The bottom plate 33b is compression molded.

Note that during the movement of the moving platen 9, the main ram 3 is switched to a high output, low speed main ram 3. Note that after the bolster 18 is raised, the pusher 28a is returned to its original position.

After molding, when the moving platen 9 is lowered, it seats on the cylinder platen 4 and stops, and the lifting rod 38 also seats and pushes up the wheel 20 with its upper end surface, so that the bolster 18 floats up from the moving platen 9. At this time, the bolster pull-out car 12
Since the flange member 17a of the docking pin 17 is stationary and waiting at the original position, the inverted U-shaped member 1 which is the connecting member of the descending bolster 18
The groove 19b of No. 9 engages with the flange member 17a of the docking pin 17, but as described above, the clearance t2 between the flange member 17a and the groove 19b of the inverted U-shaped member 19 is distributed, for example, by 15 mm on both sides of the flange member 17a. Since the flange member 17a and the inverted U
There is no interference with the inverted U-shaped member 19, no damage or bending, and the inverted U-shaped member 19 smoothly returns to its original position. The bolster 18 and the bolster pull-out wheel 12 are now automatically connected, so the hydraulic cylinder 14 is operated to pull out the bolster 18 above the knotting device 39, and the hydraulic cylinder 40
When activated, the push rod 43 protrudes into the bolster 18 via the knotting frame 42, and the bottom plate 3
Since 3a is pushed up, the molded product can be taken out of the mold.

This completes the molding cycle, but during this molding cycle, the lower mold 33 on the opposite side bolster 18 is filled with powder 34, and during the notching operation of the formed bolster 18, the opposite side bolster 18 enters. A molding operation is performed. And after this,
The forming operation is repeated by moving the bolsters 18 on both sides back and forth alternately.

In this example, an example was shown in which the present invention was applied to a compression molding machine, but the upper mold is fixed and the lower mold is fixed to a movable platen via a bolster and is moved up and down. If available, the process can be similarly applied to a rigid molding machine such as an injection molding machine or a die-casting machine.

Further, in this embodiment, an example is shown in which the bolster 18 and the lower mold 33 are used in combination as the lower mold member, but this is also possible by using only the lower mold 33 without using the bolster 18. You can also do it.

Of course, one side of the inverted U-shaped member 19 is connected to the bolster 1.
8 walls can also be used.

[Effects of the Invention] As is clear from the above description, according to the present invention, the groove of the inverted U-shaped member is formed by slightly pushing the lower mold member with a pusher. Since there is a gap between the inner surface in the horizontal movement direction and the outer surface in the horizontal movement direction of the flange member, the inverted U-shaped member and the flange member are separated at the connection part between the lower mold member and its drive device side. When the lower mold member is raised and lowered, the lower mold member is attached and detached with mutual play being distributed to both sides. Therefore, it is easy to attach and detach, and there is no wear, damage, twisting, etc. of the connecting member, and its durability is improved, and the work can be carried out smoothly, safely, reliably and easily.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the apparatus used to carry out the present invention, in which FIG. 1 is a plan view of the compression molding machine in which this is implemented, near the bolster, FIG. 2 is a front view of the same, and FIG. The figure is a front view of the positioning device, FIGS. 4a and 4b are explanatory views of the operation, FIG. 5 is a front view of the compression molding machine, and FIG. 6 is a plan view. 9... Moving platen, 12... Bolster puller, 14... Hydraulic cylinder, 17... Docking pin, 17a... Flange member, 18... Bolster, 19... Inverted U-shaped member, 20... Hydraulic cylinder , 28... Stopper ring, 28a... Pusher, t1, t2... Play.

Claims (1)

[Scope of Claims] 1. A lower mold member that is detachably connected to the driving device side by a connecting member and that enters a predetermined position on a movable platen that can move up and down, and that is attached above the predetermined position. The lower mold member is provided with an upper mold, and the connecting member between the lower mold member side and the drive device side is vertically removably fitted to each other, and is provided integrally with the lower mold member. an inverted U-shaped member having a groove that opens downward and has a predetermined inner width dimension in the horizontal advancing and retreating direction in which the member advances and retreats on the movable plate; and an inner width of the groove of this inverted U-shaped member in the horizontal advancing and retreating direction. Using a vertical molding machine formed with a flange member on the driving device side having a thickness thinner than the dimensions, the lower mold member is driven by the driving device and stopped slightly before the predetermined position, and a pusher is operated. Then, push the inner surfaces of the groove of the inverted U-shaped member to a predetermined position away from both outer surfaces of the flange member in the horizontal direction, and then raise the lower mold member together with the movable platen to the upper mold. After pressing and forming, lower the lower mold member with the pusher retracted so that both inner surfaces of the groove of the inverted U-shaped member in the horizontal direction do not touch both outer surfaces of the flange member in the horizontal direction. Mold opening/closing in a vertical molding machine in which an inverted U-shaped member is positioned around a flange member, and then the flange member is moved to move the lower mold member from above the movable platen to outside the machine. ,Moving method.