JPH0784024B2 - Mold fixing device in injection molding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mold fixing device in an injection molding machine, and more specifically, a mold of various sizes, large and small, is detachably attached to a platen of the injection molding machine. The present invention relates to a mold fixing device that can be used.

[Conventional technology]

For example, a resin molded product such as a bumper mounted on a vehicle body of an automobile or an instrument panel arranged in a vehicle interior is integrally molded by an injection molding machine. FIG. 5 and FIG. 6 show a conventional mold fixing device of an injection molding machine used for injection molding a large-sized resin molded product of this type. In the drawings, (1a) and (1b) are a pair of a movable platen and a fixed platen which constitute an injection molding machine, and (2a).
(2b) is a mold that is detachably attached and fixed to each of the platens (1a) (1b), and the molds (2a) (2b) are the main body (3
a) (3b) mounting plate (4a) (4b) at the rear end,
Moreover, the positioning recesses (5) are formed on the lower end surfaces of the mounting plates (4a) and (4b), respectively. Reference numeral (6) denotes a plurality of support rollers rotatably arranged side by side below the facing surfaces (1a ′) (1b ′) of the platens (1a) (1b). A mold (2a) (2b) is supported so as to be movable in the horizontal direction. (7) is each platen (1a) above
Positioning pins (7) are arranged at the center of the lower part of (1b) in the left-right direction side by side with the supporting roller (6), and these positioning pins (7) are used for positioning recesses (5) of the dies (2a) (2b). ) Removably insert and lock into the mold (2a) (2b)
The horizontal positioning of the. (8) is a plurality of hydraulic lower clampers arranged side by side with the support rollers (6) below the platens (1a) (1b), and (9) is above the platens (1a) (1b). A plurality of hydraulic upper clampers arranged so as to face the lower clamper (8), and the upper clamper (9) and the lower clamper (8) each mold (2a)
(2b) Mounting plate (4a) (4b) Upper and lower edges (10a) (10
a ') (10b) (10b') are clamped respectively, and the molds (2a) (2b) are detachably attached and fixed to the platens (1a) (1b).

Then, the platen (1a) (1b) above the mold (2a) (2
When mounting b) respectively, move each supporting roller (6) with each mold (2a) (2b) held upright, and each positioning pin (7) moves to each mold (2a) (2b). When the molds (2a) and (2b) are positioned in the left-right direction by being fitted and locked in the positioning recesses (5) of, the upper and lower clampers (9)
(8) operates to clamp the upper and lower edges (10a) (10a ') (10b) (10b') of the respective molds (2a) (2b), and molds to the platens (1a) (1b). (2a) and (2b) are detachably attached and fixed.

By the way, since the bumper or instrument panel, which is an automobile part, has different sizes depending on the vehicle type,
It is necessary to change the mold according to the car model. However, as shown in FIGS. 7 and 8, each platen (1
If you try to attach a small size mold (11a) (11b) to a (1b), the mold (11a) (11b) and the platen (1a) (1
The center line (a) and (b) with b) are greatly shifted in the vertical direction,
Therefore, the platen (1a) (1b) cannot be fitted with a small size mold (11a) (11b). still,
The molds (11a) (11b) have mounting plates (13a) (13b) integrally provided at the rear ends of the main bodies (12a) (12b), and the mounting plates (13a) (13b)
Positioning recesses (14) are formed on the lower end surface of b).

Therefore, conventionally, when the small-sized molds (11a) (11b) are mounted on the platens (1a) (1b), respectively, the upper and lower parts of the molds (11a) (11b) are attached to the rear end face of the molds. A large-sized auxiliary mounting plate that can be clamped by the clampers (9) (8) is attached, and the upper and lower edges of this auxiliary mounting plate are clamped by the clampers (9) (8), thereby each platen ( Small-sized molds (11a) and (11b) were detachably attached and fixed to 1a) and (1b).

[Problems to be Solved by the Invention]

According to the conventional mold fixing device, each platen (1a)
When mounting a small size mold (11a) (11b) to (1b), a large size auxiliary mounting plate must be attached to the rear end surface of the mold (11a) (11b), which is why There is a problem that mounting the mounting plate requires a lot of labor and time, and the workability is extremely poor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold fixing device capable of removably attaching molds of various sizes to a platen of an injection molding machine by a simple work.

[Means for Solving the Problems]

The present invention has been proposed to achieve the above object,
A platen that is held upright and a mold is detachably attached to it, an elevating unit that is installed under the platen so that it can be moved up and down, and the upper part of the platen can be moved up and down symmetrically in conjunction with the elevating unit. And a plurality of upper clampers that clamp the upper part of the mold, and the lifting unit includes a plurality of support rollers that support the mold so that the mold can move in the horizontal direction, and the support rollers are installed in parallel with the support rollers. And a plurality of lower clampers for clamping the lower part of the mold.

[Action]

When mounting a large-sized mold to the platen, hold the upper clamper and the lifting unit at the rising and falling ends, respectively, and then move them on the support roller of the lifting unit while holding the mold upright to move it to a fixed position. After positioning, the upper and lower clampers are operated to clamp the upper and lower parts of the mold, and the mold is detachably attached and fixed to the platen. When mounting a small-sized mold on the platen, the mold is raised and held on the supporting roller of the lifting unit held at the lower end, and then the lifting unit is lifted. The upper clamp moves symmetrically downward in conjunction with the lifting operation of the lifting unit, the upper clamp comes into contact with the upper edge of the mold, and at the same time, the platen is aligned with the center line of the mold. The upper clamp and the lower clamper of the lifting unit are actuated to clamp the upper and lower edges of the mold, and a small mold is removably mounted on the platen.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. It should be noted that the same components as those shown in FIGS. 5 to 8 are designated by the same reference numerals and the description thereof will be omitted. In the drawing, (21) is an elevating unit installed under the respective platens (1a) (1b) so as to be able to ascend and descend, and the elevating unit (21) is a horizontally elongated vertically extending base (22). ), A plurality of support rollers (23), a positioning pin (24), and a plurality of hydraulic lower clampers (25). The support roller (23) is for supporting the molds (2a) (2b) so as to be movable in the horizontal direction, and is rotatably mounted on the elevating base (22) at a predetermined interval. . Positioning pin (24) is for each mold (2a)
The mold (2a) is fitted and locked in the positioning recess (5) of (2b).
(2b) is for positioning in the left-right direction, and is mounted side by side with the supporting roller (23) at the center position of the elevating base (22). In addition, the lower clamper (25)
a) Clamps the lower edges (10a ') and (10b') of (2b), and supports rollers (2) at appropriate positions on the lifting base (22).
It is installed side by side with 3). Reference numerals (26) and (26) are drive cylinders for moving the lifting unit (22) up and down. The lifting base (22) is horizontally fixed to the upper ends of the rods (27) and (27) of the driving cylinders (26) and (26). I am doing it. Reference numeral (28) is a plurality of support rollers having the same function as the support roller (23), and the support rollers (28) are the platens (1a).
It is rotatably mounted at the lower end of (1b) and is held on the same horizontal plane as the support roller (23) of the lifting unit (21) held at the lower end. (29) is installed on the upper part of each platen (1a) (1b) so as to be able to move up and down symmetrically in conjunction with the lifting operation of the lifting unit (21) and to face the lower clamper (25). This is a plurality of hydraulic upper clampers. For example, as shown in FIG. 4, the upper clamper (29) has a T-shaped guide piece (30) protruding from the rear end of the clamper (29). , The guide piece (30) is slidably fitted into the dovetail-shaped guide grooves (31) formed on the facing surfaces (1a ') (1b') of the platens (1a) (1b), respectively. The upper clamper (29) and the lower clamper (25) have upper and lower edge portions (10a) (10) of each mold (2a) (2b).
a ') (10b) (10b') are clamped respectively, and the molds (2a) (2b) are detachably attached and fixed to the respective platens (1a) (1b). The vertical movements of the upper and lower clampers (29) (25) are interlocked by an appropriate interlocking mechanism using, for example, a rack and a pinion.

Thus, when the large molds (2a) and (2b) are attached to the platens (1a) and (1b), respectively, the upper clamper (2
9) and the elevating unit (21) are respectively held at the ascending end and the descending end, and then the molds (2a) (2b) are moved up and up on the supporting rollers (28) (23). When the positioning pins (24) are fitted and locked in the recesses (5) of the molds (2a) (2b) and the molds (2a) (2b) are positioned in the left-right direction, the upper clamper (29) and the lower clamper (25) of the lifting unit (21) respectively actuate to act on the upper and lower edges (10a) (10a ') (10b) (1) of each mold (2a) (2b).
0b ') is clamped, and the molds (2a) and (2b) are detachably attached and fixed to the platens (1a) and (1b).

Next, place the small mold (11) on the platens (1a) (1b).
When installing a) (11b), install the upper clamper (29) beforehand.
And hold the lifting unit (21) at the upper end and the lower end. Then, the molds (11a) (11b) are moved up on the support rollers (28) (23) with the molds (11a) (11b) standing upright, and the positioning pins (24) move to the recesses of the molds (11a) (11b). When the molds (11a) and (11b) are positioned in the left-right direction by being fitted and locked in the (14) respectively, the lifting unit (21) rises. By the lifting operation of the lifting unit (21), the molds (11a) (11b) supported by the respective support rollers (23) are lifted upwards, and at the same time as the lifting operation of the lifting unit (21), the upper part is moved upward. The clamp (29) moves symmetrically downward, and the center lines (a) and (b) of the platens (1a) (1b) and the molds (11a) (11b) coincide with each other, and at the same time, the upper clamp (29) moves to the mold. The upper clamps (29) and the lower clamper (25) of the elevating unit (21) are actuated in contact with the upper edge portions (32a) (32b) of the (11a) and (11b), and the mold ( Upper and lower edges (32a) (32a ') (32b) (3) of 11a) (11b)
2b ') is clamped, and small-sized molds (11a) (11b) are detachably attached to each platen (1a) (1b).

In addition, in the above-mentioned embodiment, the case where the mold used for injection molding of large parts for automobiles is fixed has been described, but the present invention is not limited to this, and is used for injection molding of various parts. It can be widely used for fixing a mold.

〔The invention's effect〕

According to the present invention, it is possible to detachably attach molds of various sizes to the platen only by symmetrically raising and lowering the raising and lowering unit and the upper clamper, so that the die replacement work can be performed in a short time. Therefore, the workability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of the device of the present invention, FIG. 2 is a schematic front view showing the operating procedure of the device of the present invention, FIG. 3 is an explanatory view of a lifting unit, and FIG. 4 is an attachment of an upper clamper. It is a plane sectional view showing a state. FIG. 5 is a schematic side view of the conventional apparatus, FIG. 6 is a schematic front view of the conventional apparatus on the movable platen side, and FIGS. 7 and 8 are for explaining problems when a small-sized mold is attached. FIG. (1a) (1b) ...... Platen, (2a) (2a) (11a) (11b) …… Mold, (21) …… Lifting unit, (23) …… Support roller, (25) …… Lower clamper , (29) …… Upper clamper.

Claims (1)

[Claims] 1. A platen which is held upright and in which a mold is detachably mounted, an elevating unit which is installed in a lower part of the platen so as to be vertically movable, and an upper part of the platen which is interlocked with the elevating unit. The elevator unit is provided so as to be able to move up and down symmetrically, and is composed of a plurality of upper clampers that clamp the upper part of the mold. The lifting unit includes a plurality of support rollers that support the mold so as to be horizontally movable, and A mold fixing device in an injection molding machine, comprising: a plurality of lower clampers arranged in parallel with a support roller and clamping a lower part of the mold.