JPH0345785Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a vertical molding machine such as a plastic molding machine or a die-casting machine that has a vertical pressurizing direction, and is used to attach a mold and move it in and out of the pressurizing section. This invention relates to a bolster device for fixing molds.

[Conventional technology]

Plastic molding machines such as injection molding machines and compression molding machines, and molding machines such as die casting machines for metal casting, are classified as vertical molding machines depending on whether the pressure operation direction is vertical or horizontal. It is broadly divided into horizontal molding machines, and vertical molding machines are those that move a lower mold up and down relative to a fixed upper mold to close and open the mold, and those that use a fixed lower mold to open the mold. Some molds are clamped and opened by raising and lowering the upper mold relative to the mold.

The large vertical molding machine is equipped with a bolster device 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 device and moved directly below the upper mold. The mold is clamped by advancing the mold and raising the bolster device hydraulically or lowering the upper mold. In addition, a compression molding machine fills powdered resin into the lower mold and performs pressure molding, and this type of molding machine is equipped with two sets of bolster devices, and during molding work, a spare bolster is placed on top of the A mold is prepared by filling it with resin, and in this case, an upper mold is often stacked on top of a lower mold filled with resin before entering the pressurizing section.

The bolster that carries the lower mold or both molds and moves forward and backward is equipped with multiple wheels, and the fixed platen or movable platen into which this bolster enters must be placed on the same plane as these. The rails on which the wheels roll are installed. In order to make it easier to run, the lower surface of Voltas must be separated from the upper surface of the fixed or movable plate while the wheels are rolling, and when applying pressure for mold clamping and molding, it is necessary to keep the bottom surface away from the top surface of the fixed plate or movable plate. Because it is necessary to bring the lower surface of the bolster into close contact with the lower surface of the fixed platen or movable platen so that the It is being

For example, the system disclosed in Japanese Utility Model Publication No. 58-19003 divides the rail below the wheel of the bolster that stops at the mold clamping position, making only this part a rail that can be raised and lowered, and this raising and lowering rail is connected to a hydraulic cylinder. It is raised by a ram to lower and raise the wheels. It has also been proposed that the lifting rail is biased upward by a spring member and the spring member is compressed during mold clamping.

[Problems that the idea aims to solve]

However, the wheel drop structure in such conventional bolster devices requires a hydraulic cylinder for each of a plurality of wheels, making the structure complex and cannot be provided at a low cost. The problem with this was that when the vehicle was running, the weight of the bolster caused the front wheels to sink, making it difficult to drive smoothly.

[Means for solving problems]

In order to solve this problem, in this invention, a rod that can be raised and lowered is inserted into a circular hole provided below each wheel of the bolster that stops at the molding position on the movable platen, and the rod is seated when the movable platen is lowered and seated. The length of the rod is set so as to support the bolster with this, and a stepped portion for regulating the lowering limit of the rod, which descends under its own weight when the movable platen rises, is provided between the rod and the circular hole.

[Effect]

With this configuration, when the bolster is advanced onto the movable platen, the wheels are supported by the rods seated on the seating surface side of the movable platen.
Also, when the movable platen is raised from this state, the rod will descend under its own weight until the lower limit is regulated by the stepped part, and the wheels will fit into the circular holes, causing the movable platen to come into close contact with the bolster. increase in an integrated manner.

[Example] This example shows an example in which the mold fixing bolster device according to the present invention is implemented in a compression molding machine. Figure 2 is a plan view of the mold fixing bolster device;
FIG. 3 is a front view, FIG. 4 is a front view of a compression molding machine embodying the present invention, and FIG. 5 is a plan view. In these figures, a molding machine main body, generally designated by reference numeral 2, is erected on a step provided in a pit 1 under the floor surface, with a main ram 3 at its lower end inserted into a hole in the pit 1. This molding machine main body 2
is the cylinder platen 4 that supports the 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 being pumped.

As shown in detail in FIG. 1, the reference numeral 9 is a moving platen, which is 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 raised and lowered at a 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. Reference numeral 17 denotes a pair of docking pins protruding from the front end surface of the bolster pull-out wheel 12, and a large-diameter collar 17a is formed at the tip.

What is indicated by the reference numeral 18 is a bolster pull-out wheel 12.
The bolster is connected to the rail 11 and runs integrally with it between the center of the rail 11 and right above the moving platen 9, and is formed in a square shape with approximately the same dimensions as the moving platen 9. A pair of U-shaped connecting fittings 19 protruding from the end face on the side of the drawer wheel 12 and opening downward are engaged with the flange 17a of the docking pin 17, thereby being detachably connected to the bolster puller wheel 12.
Note that the engaging portion between the connecting fitting 19 and the collar 17a is
For example, a clearance of about 30 m/m is provided in the thickness direction of the collar 17a. Further, the small diameter portion of the docking pin 17 engages with the U-shaped groove of the connecting fitting 19 in a vertically removable manner. Wheels 20 are supported by four bearings integrally formed on the lower surface of the bolster 18 with the same gap as the wheels 13 of the bolster pull-out wheel 12. For example, it is about 15m/m lower than the
The lower surface of the bolster 18 is the running surface of the rail 11
and is floating above the upper surface of the 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 with the wheels 20 with the same gap. Further, a guide groove 22 having a V-shaped cross section is provided on the upper surface of the moving platen 9 and extends from side to side in the center between the rails 21. By engaging with this guide groove 22, the running of the bolster 18 on the moving platen 9 is guided and the bolster 18 is positioned in the front and rear direction when stopped. Note that a clearance of, for example, several m/m is provided between the protrusion 23 and the guide groove 22.

Next, a mechanism for positioning the bolster 18 in the left-right direction, which stops on the moving platen 9, will be explained. A cylinder bracket 25 is fixed to a bracket 24 (only one side is shown in FIGS. 1 and 2) projecting to the left and right of the moving platen 9, which is the working surface of the side cylinder 7 shown in FIG. A hydraulic cylinder 26 is pivotally attached to the working end of the piston rod 27, and a stopper frame 28, which is formed in a U-shape in plan view and extends diagonally downward, is pivotally attached to the working end of the piston rod 27 by a pin 29. A pair of links 30, which are pivotally connected to the bracket 24, are pivotally connected to the stopper frame 28, and when the piston rod 27 moves back and forth, the four-bar link movement between the stopper frame 28 and the links 30 and the hydraulic cylinder The vertical pressing surface 28a at the upper end of the stopper frame 28 is configured to move forward and backward between the pressing position on the protrusion 23 shown in the figure and the diagonally downward position thereof as a result of the combination of the swinging movements of the stopper frame 28. By doing this, the bolster pull-out wheel 12 is aligned with the bolster 18.
Press to drive, and the bolster 18 is, for example, 15 m/
When it comes to this side and stops, the piston rod 27
moves forward and pushes the vertical pressing surface of the stopper frame 28 by, for example, 15 m/m, positions it at a normal position, and stops it. In this case, since the play between the collar 17a of the docking pin 17 and the connecting fitting 19 is, for example, 30 m/m, this 30 m/m play is shifted toward the pull-out wheel 12 at the temporary stop position. This clearance is 15m/m at the normal stopping position.
distributed on both sides.

A lower mold is fixed in advance to the bolster 18, which is moved back and forth and positioned in this manner, in the retracted position shown on the right side of FIGS. 4 and 5. That is, four rectangular grooves 31 are provided on the upper surface of the bolster 18 and extend from the center of each corner of the square toward the center. 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 33c that support the bottom plate 33b. Afterwards, it is fixed to the bolster 18 with a plurality of bolts. In this embodiment, the lower mold 33 is filled with a powder 34 of, for example, polytetrafluoroethylene resin. 35 is a T-slot for fixing a lower mold of a different size. On the other hand, the top platen 5
An upper mold 36 is fixed to the lower surface of the lower mold 33 facing the lower mold 33, and by raising the lower mold 33, the upper mold 36 is press-fitted into the outer frame 33a of the lower mold 33, and the bottom plate 33b, the Teflon powder 34 is compression-molded. In order to facilitate and accurately fit the two molds 33 and 36 together, the lower member of the upper mold 36 is suspended from the upper member by a hanging bolt, and is formed so that it can be moved a small amount in each horizontal direction. There is.

The bolster device that ascends and descends for molding in this manner is provided with a wheel dropping mechanism that drops the wheels 20 below the upper surface of the moving platen 9 when rising, and the configuration thereof will be described below.
The rail 21 of the moving platen 9 is divided below the wheels 20 of the stopped bolster 18, and each divided portion has circular holes 37, 38 that vertically penetrate the moving platen 9.
It is located directly below the hole. Of these, the circular hole 37 is provided directly in the moving platen 9, while the inner hole 38 is provided in a pusher 40 of a bearing 39 fixed to the moving platen 9.
What is generally designated by the reference numeral 41 is an elevating rod that is fitted into circular holes 37 and 38 and supported so as to be able to rise and fall freely. A disc 42 for supporting the wheel 20 is screwed onto the upper stage via a shim 43 for height adjustment. Further, a pusher 44 is fitted into the second stage and is pivotally supported in the inner hole 37, and the fourth stage is further pivotally supported in the inner hole 38. 45 is a spring washer, and 46 is a dust cover. The moving platen 9, which is driven up and down by the main ram 3 and the side cylinders 4, is seated on the upper surface of the cylinder platen 4 at the lowering limit shown in FIG. It is seated on the upper surface of the liner 47, and the upper end surface of the lifting rod 41 is flush with the upper surface of the cylinder platen 9. Therefore, there is a gap between the lower surface of the bolster 18 that has entered this state and the upper surface of the moving platen 9, as shown in FIG.
A gap is formed which is equivalent to the protrusion dimension of the wheel 20 indicated by t ₁ . Also at this time, the lifting rod 41
There is a gap slightly larger than the gap t ₁ between the step between the third and fourth stages and the upper end surface of the bush 40.
t ₂ is formed. Furthermore, when the moving platen 9 rises and leaves the cylinder platen 4 for mold clamping and molding, the lifting rod 41 remains _seated due to its own weight. Since the stepped portion 41 comes into contact with the upper surface of the bush 40, the elevating rod 41 then rises along with the moving platen 9. At this time, the upper end surface of the lifting rod 41 is buried below the upper surface of the moving platen 9 by t ₂ , the wheel 20 is inserted into the circular hole 37 , and since t ₁ is smaller than t ₂ , the bolster 1
8 and the moving platen 9 are in close contact with each other and are configured to rise as one.

The moving platen 9, which has risen in this way and finished mold clamping and molding, descends and seats on the upper surface of the cylinder platen 4, but at this time, the dotting pin 17 remains in its original position and waits. It is configured to engage with a connecting fitting 19 of the bolster 18. Then, as shown in FIG. 4, the bolster 18 is pulled out to the center of the rail 11 by the bolster pull-out wheel 12, but the molded product in the lower mold 33 is placed at the same position on the opposite side from this position. A knocking device 48 for pushing out is provided respectively. The knotting device 48 is composed of a hydraulic cylinder 49, a knotting frame 51 fixed to the working end of the piston rod 50, and push rods 52 erected at the four corners of the knotting frame 51.
Further, the bolster 18 is provided with a hole 53 into which the pushing rod 52 is inserted. When the piston rod 50 moves forward, the knocking frame 5
An extrusion rod 52 protrudes from the hole 53 through the hole 53 and extrudes the molded product together with the bottom plate 33b of the lower mold 33.

The operation of the compression molding machine configured as above will be explained. Prior to the molding operation, place the lower mold 33 from directly above onto the bolster 18 located on the right side in Figures 4 and 5, hold it down from four sides with the positioning fittings 32 to position it, and then tighten the four corners with bolts. Fix it to the bolster 18 with. After filling the lower mold 33 with powder 34 of, for example, polytetrafluoroethylene resin, when the piston rod 15 of the hydraulic cylinder 14 is advanced, the portal pull-out wheel 12 and the bolster 18 connected thereto are moved from the wheels 13, 20. The pole star 18 moves forward by rolling, and enters onto the moving platen 9 while being guided by the engagement between the protrusion 23 and the guide groove 22. When the bolster 18 stops, for example, 15 m/m before the normal position, the piston rod 27 of the hydraulic cylinder 26 moves forward, and the vertical pressing surface 28a of the stopper frame 28 is moved forward by the link action.
moves forward diagonally upward and moves Voltas 18 to, for example, 15
Since the button is pressed m/m, the bolster 18 stops at the normal position. During this 15 m/m extension, the bolster pull-out wheel 12 is stopped and the docking pin 17 at the connection part with the bolster 18 is stopped, so the The gap of 30m/m is 15m/m on both sides of the guard 17a.
It is distributed by m. When the bolster 18 enters, the lifting rod 41 is seated on the liner 47, as shown in FIG. The wheel 20 is supported by the lifting rod 41 and stopped.
At this time, a gap t ₁ having the same size as the protrusion amount of the wheel 20 is formed between the bolster 18 and the moving platen 9. Further, a gap t ₂ is formed between the stepped portion of the lifting rod 41 and the upper end surface of the bush 40.

When the side cylinder 7 is activated to raise the moving platen 9 via the bracket 24, the lifting rod 41 remains seated due to its own weight while the moving platen ₉ is raised by the gap t2, and when the moving platen ₉ is raised by the gap t2, the stepped portion of the lifting rod 41 is lifted. Since the upper end surface of the bush 40 comes into contact with the upper end surface of the bush 40, the moving platen 9 is raised together with the lifting rod 41. At this time, the upper end surface of the lifting rod 41 is buried below the upper surface of the moving platen 9 by t ₂ and the wheel 20 is inserted into the circular hole 37, and since the clearance t ₁ is smaller than the clearance t ₂ , the bolster 18 and the moving platen 9 come into close contact and rise together. When the upper mold 36 suspended by the hanging bolt comes into contact with the lower mold 33 as the moving platen 9 rises, if both molds 33 and 36 are misaligned, they will move slightly in each horizontal direction. Lower mold 33 while being positioned
When the lower mold 33 is fitted and further raised, the Teflon powder 34 is applied to the upper mold 36 and the bottom plate 3.
3b and 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.

After molding, when the moving platen 9 is lowered, it seats on the cylinder platen 4 and stops.
Gap t ₂ minutes before the lifting rod 41 reaches the liner 47
, only the moving platen 9 is lowered by a gap t ₁ minute, and a gap t ₁ is formed between the bolster 18 and the moving platen 9.
It will stop in the state shown in the figure. At this time, the dotting pin 17 of the bolster pull-out wheel 12 is stopped at its original position and is waiting, so the bolster 1 that is descending
The connecting fitting 19 of 8 is the collar 17 of the docking pin 17
However, as mentioned above, the gap between the collar 17a and the connecting metal fitting 19 is distributed on both sides of the collar 17a, so the collar 17a and the connecting metal fitting 19 do not interfere with each other and are not damaged. Now Polsta 1
8 and the bolster pull-out wheel 12 are automatically connected, so when the hydraulic cylinder 14 is operated to pull out the bolster 18 above the knotting device 48 and the hydraulic cylinder 49 is operated, it is pushed out through the knotting frame 51. Since the rod 52 protrudes into the bolster 18 and pushes up the bottom plate 33b, the molded product can be taken out of the mold.

When the molding cycle is completed, resin is filled into the lower mold 33 on the opposite bolster 18 during this molding cycle, and during the knotting operation of the molded bolster 18, the opposite bolster 18 is inserted and molded. work is done. After this, the forming operation is repeated by moving the bolsters 18 on both sides back and forth alternately.

In this example, the present invention was applied to a compression molding machine, but if the upper mold is fixed and the lower mold fixed bolster is raised and lowered together with the movable platen, injection molding can be performed. The same method can be applied to a vertical molding machine such as a molding machine or a die-casting machine.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in a mold fixing bolster device for a vertical molding machine, the bolster that stops at the molding position on the movable platen can be raised and lowered into the inner hole provided below each wheel. The length of the rod is set so that when the movable platen is lowered and seated, it seats and supports the bolster, and the rod is lowered by its own weight when the movable platen is raised. By providing a rod between the rod and the circular hole, when the bolster moves forward and backward onto the movable platen or stops on the movable platen, the upper end surface of the rod becomes flush with the rail, allowing for smooth and accurate movement. In addition, when the bolster is raised, the rod descends under its own weight and brings the movable plate into close contact with the bolster, so the structure is greatly simplified compared to conventional systems in which the rod is raised and lowered using hydraulic cylinders, etc. , this can be provided at low cost.

[Brief explanation of drawings]

1 to 5 show embodiments of a mold fixing bolster device for a vertical molding machine according to the present invention.
The figure is a sectional view of the wheel drop structure shown in the AA cross section of Figure 2, Figure 2 is a plan view of the bolster device for fixing the mold, Figure 3 is a front view of the same, and Figure 4 is a compressor according to the present invention. The front view of the molding machine, FIG. 5, is also a plan view. 9...Moving platen, 18...Bolster, 20...Wheel, 33...Lower mold, 37, 38
...Round hole, 41...Elevating rod.

Claims (1)

[Scope of utility model registration request] In a vertical molding machine in which a bolster with a mold fixed thereon is floated from a movable platen and entered onto the movable platen by rolling wheels, and the mold is clamped and opened by raising and lowering this movable platen, A circular hole is provided below each wheel of the bolster that stops at a predetermined position, passing through the movable platen up and down, so that when the movable platen is lowered and seated, it is seated and the bolster is supported through the wheels, and when the movable platen is raised, it is lowered by its own weight. A rod for engaging the wheel into the circular hole so as to bring the movable plate into close contact with the bolster is supported by the inner hole so as to be able to rise and fall freely, and a lowering limit of the rod is regulated between the rod and the circular hole. A mold fixing bolster device for a vertical molding machine, characterized by having a stepped portion.