JPH0477214A - Mold device - Google Patents

Abstract

PURPOSE:To clamp a stationary mold and a movable mold surely and to heighten the accuracy of molding by providing the clamp mechanism which is releasably provided between the stationary mold and the movable mold and keeps both molds in mold-clamped condition in engagement. CONSTITUTION:Since a movable mold 16 is directly clamped to a stationary mold 11 by the clamp mechanism 29 provided releasably between both molds, the shortage of mold clamping due to the flexure etc. of the members intervening these between does not occur. To bring the movable mold 16 to mold- opening state from mold-closing, the engagement with the clamp mechanism 29 is released, and a driving cylinder 19 is operated in mold-opening direction. Then, first the movable mold 16 is guided to the mold releasing direction-guiding part 14a of a turning body 14, and is moved in mold releasing direction, and then said movement is controlled by first restricting means 22. Therefore, the driving force from the driving cylinder is transmitted to the turning body. Consequently, the turning body is rotate a around the shaft 15 as its center, and in the movable mold, said movement changes to rotary movement, and perfect mold-opening position is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Field of Application) The present invention relates to a mold device with an improved structure for opening and closing a mold.

(Prior Art) For example, the conventional structure of a foamed resin mold consisting of an upper mold and a lower mold is shown in FIGS. 9 to 11.

Here, the fixed mold 1 is fixed on a base 2, and the movable mold 3 is provided thereon. A gate-shaped upper mold frame 4 is provided above the movable mold 3, one end of which is rotatably supported by the base 2 via a hinge part 5, and the other end of which is rotatably supported by the base 2. A clamping mechanism 6 is provided which engages with. The movable mold 3 is attached to the upper mold frame 4 so as to be moved up and down by a hydraulic cylinder 7 for vertical movement, and the upper mold frame 4 is rotated by a hydraulic cylinder 8 for rotation.

In the above configuration, in order to change from the mold clamping state to the mold opening state shown in FIG. Set it in the unloaded state (see Figure 10). Next, when the hydraulic cylinder 8 for rotation is activated, the upper mold frame 4 or the hinge part 5 is rotated in the direction of the arrow in FIG. 10, and the mold is completely opened as shown in FIG. 11. Become.

This allows the molded product to be easily removed. After taking out the molded product, in order to clamp the mold for re-molding, each cylinder is operated in the reverse order to the above-mentioned order.

(Problem to be solved by the invention) By the way, with this type of mold, it is important to securely clamp the movable mold to the fixed mold so that the movable mold does not lift up even when subjected to foaming pressure. be. This is because the lifting of the movable mold causes a decrease in the precision of the molded product, such as fluctuations in wall thickness.

However, in the above configuration, since the movable mold 3 and the fixed mold are indirectly clamped via the upper mold frame 4, if foaming pressure is applied from inside the mold during mold clamping, even if the clamping mechanism Even if the mold 6 is solid, the movable mold 3 is likely to be lifted up due to the bending of the upper mold frame 4. In addition, as the upper mold frame 4 is rotated many times to repeatedly open and close the mold, it is unavoidable that the hinge portion 5 will wear out and the upper mold frame 4 will become stiff due to fatigue. Therefore, when the movable mold 3 is subjected to foaming pressure, the upper mold frame 4 may be lifted up at the hinge portion 5, and the movable mold 3 may eventually be lifted up. Furthermore, in order to suppress such lifting of the movable mold 3 as much as possible, the rigidity of the upper mold frame 4 must be greatly increased, and the clamp mechanism 6 and hinge portion 5 must be made sturdy, so the overall size is large. There is a problem in that the molds become bulky and heavy, making it difficult to quickly open and close the mold, which in turn reduces productivity.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a molding device that can securely clamp a fixed mold and a movable mold, while also reducing the size and weight of the entire device.

[Structure of the Invention] (Means for Solving the Problems) The mold device of the present invention includes a fixed mold and a movable mold, and after moving the movable mold in a mold clamping position in a predetermined mold removal direction, Furthermore, the mold device is configured to move to a mold opening position away from a fixed mold while rotating, and is provided so that it can be engaged and detached between the fixed mold and the movable mold, and when engaged, both molds are in a clamped state. a clamp mechanism that holds the movable mold in the mold, a rotating body that is rotatable about a pivot relative to the fixed mold side, and a mold cutter that is installed on the rotary body and supports the movable mold so that it can move in the direction along the mold cutting direction. a direction guide part, a drive cylinder whose base end is rotatably provided on the fixed mold side and which reciprocates the movable mold alternately in the direction along the mold removal direction and the mold clamping direction; a first restraining means for causing the movable mold to undergo rotational motion about the pivot of the rotary body by applying resistance to movement of the movable mold relative to the rotary body; When the drive cylinder is driven in the opposite direction to the mold-opening direction after reaching the mold opening position based on the mold opening position, resistance is applied to the movement of the movable mold and the rotary body, causing the movable mold to rotate around the axis of the rotary body. It is characterized in that it includes a second restraint means for starting the movement.

(Function) Since the movable mold and the fixed mold are directly clamped by a clamp mechanism that is removably provided between them, there is no possibility of insufficient mold clamping due to deflection of a member interposed between them.

In addition, to change the movable mold from the closed state to the open state,
The clamp mechanism is disengaged and the drive cylinder is operated in the mold opening direction. Then, the movable die is first guided by the die-cutting direction guide portion of the rotating body and moves in the die-cutting direction, and thereafter its movement is restricted by the first restraining means. Therefore, the driving force from the drive cylinder is transmitted to the rotary body, and as a result, the rotary body rotates around the pivot axis, and the movable mold shifts to a rotational motion and reaches the complete mold opening position. reach.

Next, when the drive cylinder is driven in the mold-clamping direction, the movable mold starts rotating around the pivot of the mass rotating body due to the function of the second restraining means, and after this, when the rotational movement ends, the movable mold starts rotating. The mold is guided again by the mold removal direction guide part and moves in the mold clamping direction to enter the mold clamping state.

(Example) Hereinafter, an example in which the present invention is applied to a mold for foamed resin will be described with reference to FIGS. 1 to 8.

The fixed mold 11 is fixed on a base 12. Hinge portions 13 are provided on both left and right sides of the fixed mold 11, and a rotating arm 14, which is a rotating body, is supported around a pivot shaft 15 here. The rotating body 14 has an L-shape as a whole with long sides and short sides connected at a substantially right angle, and a pair of linear guide rails 14a serving as die cutting direction guides are attached to the long sides. , the tip of the short side portion is connected to the hinge portion 13, and the guide rail 14a can be rotated between a state where it is approximately vertical as shown in FIG. 1 and a state where it is approximately horizontal as shown in FIG. It is possible to move.

On the other hand, the movable mold 16 is located above the fixed mold 11, and is movable between the mold closing position shown in FIG. 1 and the mold opening position shown in FIG. 3 by the configuration described below. That is, movable type 1
A housing 17 is attached to each of the left and right sides of the housing 6, and a linear bearing 18 is housed inside the housing 17. This linear bearing 18 is configured to slide on the guide rail 14a of the rotating arm 14, and when the guide rail 14g of the rotating arm 14 is in a substantially vertical state, the linear bearing 18 and the guide rail 14a cooperate with each other. The movable mold 16 is guided in the vertical direction (mold removal direction and mold clamping direction).

Further, the base 12 is provided with one hydraulic drive cylinder 19 located on both the left and right sides of the fixed mold 11, respectively.
The movable mold 16 can be moved by this drive cylinder 19. The base end of each drive cylinder 19 is connected to a base 12.
is rotatably fixed on a shaft 20, and each of the rods 19a
The tips are rotatably fixed to each housing 17 of the movable mold 16. Therefore, by operating the drive cylinder 19, the movable die 16 can be reciprocated along the guide rail 14a. In addition, rotating arm 1
4 is in a state where the guide rail 14a is substantially vertical, the sliding resistance of the linear bearing 18 is set to be smaller than the rotational resistance of the rotating arm 14. Therefore, when the drive cylinder 19 is operated in this state, the rotating arm 14 does not rotate, and the linear bearing 18 first slides along the guide rail 14g. A stopper part 22, which protrudes laterally and corresponds to a first restraint part, is integrally provided at the upper end of each rotating arm 14, and when the drive cylinder 19 is actuated, the linear bearing 1
8 slides upward along the guide rail 14a, the housing 1 is removed at a position where the movable mold 16 is completely removed from the fixed mold 11 (hereinafter referred to as the "mold removal position"), as shown in FIG.
7 comes into contact with the stopper portion 22. From this point on, the movable mold 16 receives the driving force of the drive cylinder 19 and moves the rotary arm 14.
The rotational movement begins in the direction indicated by arrow B in FIG. 2 about the pivot axis 15 of FIG.

Further, the housing 17 of the movable mold 16 is provided with a locking mechanism 23 corresponding to a second restraining means. This locking mechanism 23 is provided in connection with the fact that the sliding resistance of the linear bearing 18 is set to be smaller than the rotational resistance of the rotating arm 14, and the movable type 16 is shown in FIG. When the mold is open, move the movable mold 16 to the rotating arm 1.
4 to be in a restrained state. The detailed structure is as shown in FIG. 7, in which an engaging protrusion 24 is fixed to the rotating arm 14, and a lock arm 25 having a claw portion is rotatably provided on the housing 17. 25 is constantly biased by a spring 26 in the direction of engagement with the engagement protrusion 24 . A roller 27 is attached to the lock arm 25 on the opposite side of the claw portion thereof, and a cam plate 28 with which the roller 27 comes into contact is provided on the base 12.

When the movable mold 16 is between the mold closing position shown in FIG. 1 and a position slightly beyond the mold opening position shown in FIG. plate 28
come into contact with. With this, the lock arm 24 is attached to the engaging protrusion 2
5 is held in a disengaged state. Further, when the movable mold 16 reaches a position slightly beyond the mold opening position, the roller 27 moves to the cam plate 28 as shown in FIG. 8(B).
When the movable mold 16 is between that position and the mold opening position shown in FIG. The claw portion comes to engage with the engagement protrusion 24 of the rotating arm 14. Now lock mechanism 2
3 places the movable mold 16 in a restrained state with respect to the rotating arm 14.

Further, a clamp mechanism 29 is mounted on the upper surface of the movable mold 16. This has shafts 30 on both front and rear sides of the movable mold 16.
A total of eight clamp arms 3 are rotatably attached around the center, a link 32 is connected to the upper end of each clamp arm 31, and a link is rotatably provided on the upper surface of the movable mold 16. Toggle link 34 connected to 33
Equipped with. A clamping cylinder 35 is attached to the upper surface of the movable mold 16, and the tip of the rod 35a is connected to an eccentric position of the toggle link 34 away from the shaft 30. As a result, the rod 35a is moved from the state shown in FIG. 4 by the operation of the clamping cylinder 35.
When the clamp arm 31 protrudes, the clamp arm 31 rotates in the direction of arrow C shown in the same figure, and the clamp claw 31a at the lower end or the fixed type]1
The fifth
(see figure), the movable mold 16 is held in a mold clamped state.

Next, the operation of the above configuration will be explained.

Assume that the movable mold 16 is now in a clamped state as shown in FIG. After the molding of the product is completed, the following steps are performed to open the mold from the mold-clamped state.

First, the cylinder 35 for clamping is activated, and the rod 3
5a moves in the backward direction and the toggle link 34 rotates, thereby rotating the clamp arm 31, which releases the engagement with the clamp receiver 36 on the fixed mold 11 side (the fourth
(see figure).

Next, the drive cylinder 19 is operated to project its rod 19a, and an upward force is applied to the movable mold 16. At this time, the sliding resistance of the linear bearing 18 is set to be smaller than the rotational resistance of the rotating arm 14,
Furthermore, since the locking mechanism 23 is in the disengaged state, the rotating arm 14 does not rotate, and the linear bearing 18 first slides along the guide rail 14a, causing the movable mold 16 to move upward in the mold removal direction. start. Then, as shown in FIG. 2, at the die removal position where the movable die 16 is completely removed from the fixed die 11, the housing 17 comes into contact with the stopper part 22 of the rotating arm 14, so that the force of the drive cylinder 19 is now rotated. This comes to act on the movable arm 14, and this comes to act as a turning force in the direction of arrow B in FIG. As a result, the rotating arm 14 comes to rotate in the same direction about the pivot 15, and reaches the mold opening position where it is largely retreated from the fixed mold 11, as shown in FIG. This allows the molded product to be easily taken out.

Next, the drive cylinder 19 is driven in the opposite direction to return to the mold clamping state. In this mold opening position, the locking mechanism 2
Since the movable mold 16 is restrained from moving with respect to the rotating arm 14 by the drive cylinder 19, the movable mold 16 is
When a force acts on the movable mold 16 in the direction of the arrow in FIG.
The rotating arm unit 4 rotates in the direction of arrow E around the pivot 15 without slipping relative to the rotating arm 14.

Immediately before the rotating arm 14 reaches the mold opening position shown in FIG. Engagement protrusion 24 of rotating arm 14
When the movable mold 16 is disengaged from the rotary arm 14, the movable mold 16 becomes unrestrained with respect to the rotating arm 14. Therefore, when the rotating arm 14 rotates to the rotation limit position, the movable mold 16
The near bearing 18 slides along the guide rail 14a, and the movable mold 16 begins to move linearly downward in the mold clamping direction, returning to the mold clamping position shown in FIG. Then, the clamp cylinder 35 is activated, and the clamp arm 31 rotates to either clamp the clamp claw 31a or the clamp receiver 36.
The mold is in a clamped state by engaging with (see Figure 5)
.

According to this embodiment, in the mold clamping state, the movable mold 16 is moved to the fixed mold 1 by the clamp mechanism 29 mounted thereon.
The mold is clamped directly against 1.

Therefore, unlike the conventional mold device that clamps the mold indirectly through the upper mold frame 4 etc. as shown in FIG. There is no possibility of insufficient tightening force or imbalance. This makes it possible to suppress variations in the wall thickness of the molded product and perform highly accurate molding.

In addition, large structural parts such as the conventional upper frame 4 are no longer required, and the cylinder has two cylinders, one for vertical movement and one for rotation.
Since there is no need to provide different types and only one type of drive cylinder 19 is provided, the overall size and weight can be reduced, and quick mold opening and mold clamping operations are possible, improving productivity. I can do it. In particular, in this example,
Rather than the sequential operation of two types of cylinders, the movable mold 16 can be moved continuously from vertical movement to rotation with one stroke of one type of drive cylinder 19, so mold opening and mold closing operations can be performed smoothly and The speed can be increased, which further contributes to improving productivity.

Note that the present invention is not limited to the embodiments described above and shown in the drawings, but can also be implemented in the following embodiments.

(1) In the above embodiment, the lock mechanism 23, which is the second restraining means, is constructed by combining the lock arm 25, the cam plate 28, etc., but this can be achieved by, for example, providing a hydraulic cylinder in the housing 17, and using this hydraulic cylinder. Locking and unlocking may also be controlled.

(2) In the above embodiment, the movable mold 1 is used as the second restraint means.
6 and the rotating arm 14 are restrained. this is,
This is provided in connection with the fact that the sliding resistance of the linear bearing 18 is set to be smaller than the rotational resistance of the rotating arm 14. Conversely, when setting the sliding resistance of the linear bearing 18 to be greater than the rotational resistance of the rotating arm 14, when the drive cylinder 19 is operated from the mold clamping state shown in FIG. It is about to start with the rotational movement of the rotational arm 14. Therefore, in this case, a second restraint means constituted by, for example, a brake mechanism that restricts the rotation of the rotary arm 14 is provided, and when the drive cylinder 19 is operated from the mold clamping state, the second restraint means is provided. The movable mold 16 is first moved upward by operating the movable mold 16, and after the movable mold 16 reaches the raised position, the second restraint means is released. With this configuration, when the drive cylinder 19 is operated in the mold closing direction after the movable mold 16 reaches the mold opening position, the sliding resistance of the linear bearing 18 is greater than the rotational resistance of the rotating arm 14. Since the mold is large and the second restraining means is released, the movement of the movable mold 16 starts from a rotational movement of the pivot arm 14 about the pivot 15, and then reaches the mold opening position and moves to the second position. The restraint means is activated and the movable mold begins to move in the mold clamping direction.

(3) The rotating arm 14 does not necessarily have to guide the movable mold 16 vertically upward. In short, it is sufficient that the moving direction is along the die-cutting direction set according to the shape of the molded product, for example, it may be diagonally upward, or the moving direction may be changed during die-cutting.

[Effects of the Invention] As described above, the present invention can securely clamp the fixed mold and the movable mold, greatly improving the molding precision, and at the same time reducing the overall size and weight. It also has the excellent effect of increasing the speed of mold opening and mold clamping operations.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the present invention, in which FIG. 1 is a side view in a mold clamping state, FIG. 2 is a side view showing a state in which the movable mold has reached the mold removal position, and FIG. 2 is a side view showing the mold in an open state, and FIGS. 2, 4, and 5 are side views specifically showing the clamping mechanism. FIG. 4 shows the clamped state, and FIG. 5 shows the clamped state. FIG. 6 is an overall perspective view, FIG. 7 is an enlarged perspective view showing the second restraint means, and FIG. 8 is a partial side view showing the operation of the second restraint means. Figures 9 to 1
FIG. 1 is a view corresponding to FIGS. 1 to 3 showing a conventional molding device. In the drawing, 11 is a fixed type, 14 is a guide arm (rotating body)
, 14a is a guide rail (die cutting direction guide part), 15 is a pivot, 16 is a movable mold, 19 is a drive cylinder, 22 is a stopper part (first restraint means), 23 is a lock mechanism (second restraint means), 29 is a clamp mechanism. Agent Patent Attorney Tsuyoshi Sato (C)

Claims (1)

[Claims] 1. A fixed mold and a movable mold are provided, and after the movable mold at the mold closing position is moved in a predetermined mold removal direction, the mold is opened away from the fixed mold while further being rotated. A mold device configured to be moved to a position, the clamping mechanism being removably provided between the fixed mold and the movable mold and holding both molds in a clamped state when engaged; a rotating body provided rotatably with respect to the fixed die side; a die-cutting direction guide portion provided on the rotating body and supporting the movable die so as to be movable in a direction along the die-cutting direction; A drive cylinder is rotatably provided on the fixed mold side and reciprocates the movable mold alternately in directions along the mold removal direction and the mold clamping direction; a first restraint means for causing the movable mold to rotate about the pivot of the rotating body by applying resistance to the movement of the movable body; When the driving cylinder is driven in a direction opposite to the mold-cutting direction after reaching the mold opening position, resistance is applied to the movement of the movable mold and the rotary body, causing the movable mold to move in the direction of the rotary body. the second for starting rotational movement about the pivot axis;
A molding device comprising a restraining means.