JPH0784025B2 - 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. 4 and 5 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 provided on the lower end surfaces of the mounting plates (4a) (4b).
Are formed respectively. (6) is the platen (1
a) A plurality of support rollers rotatably arranged side by side below the facing surfaces (1a ′) (1b ′) of (1b), and the molds (2a) (2b) are supported by the support rollers (6). Support so that it can move in the horizontal direction. Reference numeral (7) is a positioning pin that is respectively arranged at the center of the lower part of each platen (1a) (1b) in the left-right direction side by side with the supporting roller (6). The molds (2a) and (2b) are laterally positioned by engagingly and disengageably engaging the positioning recesses (5) of the molds (2a) (2b). (8) is each platen (1a) above
A plurality of hydraulic lower clampers arranged side by side with the support roller (6) at the bottom of (1b), and (9) at each platen (1a)
A plurality of hydraulic upper clampers arranged on the upper part of (1b) so as to face the lower clamper (8). The upper clamper (9) and the lower clamper (8) each mold (2a) (2b). ) Mounting plate (4a) (4b) upper and lower edge (10a) (10a ') (10
b) (10b ') are clamped to each platen (1a)
The molds (2a) and (2b) are detachably attached and fixed to (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 (1a)
(1b) actuates to clamp the upper and lower edges (10a) (10b) (10a ') (10b') of each mold (2a) (2b), and the molds are attached to the platens (1a) (1b). (2a) and (2b) are detachably attached and fixed.

By the way, since the size of the bumper or instrument panel, which is an automobile part, differs depending on the vehicle type, it is necessary to replace the mold according to the vehicle type. However, as shown in FIGS. 6 and 7, 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 (8) and (9) of each part is attached, and the upper and lower edges of the auxiliary mounting plate are clamped by the respective clampers (8) and (9) so that 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 the platen, and is rotatably attached to the lower part of the platen, and
A plurality of support rollers that support the mold so as to be movable in the horizontal direction, an elevating means that is disposed at the lower end of the platen and that moves the mold supported by the support rollers up and down, and the upper and lower parts of the platen. And a plurality of upper and lower clampers that are symmetrically movable up and down in conjunction with the operation of the elevating means and clamp the upper and lower portions of the mold, and the lower clamper is at the lower end position. , And is held on a substantially horizontal plane with the support roller.

[Action]

When mounting a large-sized mold to the platen, hold the elevating means inactive, hold the upper and lower clampers at the rising and falling ends, respectively, and then move the support rollers while holding the mold upright. Then, the upper and lower edges of the mold are clamped by actuating the upper and lower clampers, and then the mold is detachably attached and fixed to the platen.
When mounting a small-sized die on the platen, the die is erected on the support roller with the lower clamper held at the lower end, and then the elevating means is operated. The mold is lifted from above the supporting roller by the operation of the elevating means, and at the same time, the lower clamper moves upward while the lower clamper is in contact with the mold in conjunction with the operation of the elevating means, and the upper clamper moves downward. Move symmetrically to. Then, at the same time when the upper clamper comes into contact with the upper edge of the mold, the center lines of the platen and the mold coincide with each other, and in this state, the upper and lower clampers operate to clamp the upper and lower edges of the mold, A small-sized mold is detachably attached to the platen.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Incidentally, the same parts as those shown in FIGS. 4 to 7 are designated by the same reference numerals, and the description thereof will be omitted. In the drawings, (21a) and (21b) are lifting means for lifting the molds (2a) and (2b), for example, hydraulic lifting cylinders. The lifting cylinders (21a) (21b) are mounted on the lower ends of the facing surfaces (1a ') (1b') of the platens (1a) (1b) via brackets (22a) (22b), and (1a ') (1b') is placed upright in front of the support members (24a) at the tips of the rods (23a) (23b).
(24b) are attached and fixed respectively. (25a) (25b) (26
a) (26b) is the upper edge (10a) (10) of each mold (2a) (2b)
b) and a plurality of hydraulic upper and lower clampers for clamping the lower edge portions (10a ′) (10b ′), each of these clampers (25a) to (26b) is attached to the platen (1a) (1b). They are installed on the upper and lower parts of the facing surfaces (1a ') (1b') side by side so that they can move up and down symmetrically in conjunction with the projecting and retracting motion of the rods (23a) (23b) of the lifting cylinders (21a) (21b). In addition, the lower clampers (26a) and (26b) are arranged at appropriate positions side by side with the supporting rollers (6) so that they are held on substantially the same horizontal plane as the supporting rollers (6) at the lower end position. . Above upper clamper (25a) (25b) and lower clamper (26a) (2
6b) are arranged so as to face each other. For example, as shown in FIG. 3, T-shaped guide pieces (27) are provided on the rear end surfaces of the clampers (25a) to (26b), respectively. This guide piece (2
7) Face each platen (1a) (1b) (1a ') (1
It is slidably fitted in the dovetail-shaped guide grooves (28) formed in b ') respectively, and these clampers (25a) to (26b) are used to insert the molds (2a) (2b) Upper and lower edges (10
a) (10a ') (10b) (10b') are clamped respectively, and the molds (2a) (2b) are detachably attached and fixed to the respective platens (1a) (1b). In addition, the upper and lower clampers (25a) to (2
The ascending / descending movement of 6b) is interlocked by an appropriate interlocking mechanism using, for example, a rack and a pinion.

Thus, when mounting large-sized molds (2a) and (2b) on the platens (1a) and (1b), the lifting cylinder (21a)
After moving the rods (23a) and (23b) of (21b) back and forth, holding the upper and lower clampers (25a) to (26b) at the ascending end and the descending end respectively, and then raising the respective dies (2a) and (2b). The support roller (6) is moved in the state of being held. When the positioning pins (7) are fitted and locked in the positioning recesses (5) of the molds (2a) (2b) and the molds (2a) (2b) are positioned in the left-right direction, Each clamper (25a) ~ (26
b) actuates individually and the upper and lower edges (10) of each mold (2a) (2b)
a) (10a ') (10b) (10b') are clamped, and the molds (2a) (2b) are detachably attached and fixed to the platens (1a) (1b).

Next, place the small mold (11) on the platens (1a) (1b).
When installing a) and (11b), the upper and lower clampers (25
Hold a) to (26b) at the rising and falling ends. Then, the molds (11a), (11b) are moved up on the support roller (6) while standing and held, and the positioning pins (7) are moved.
Are fitted and locked in the positioning recesses (14) of the respective dies (11a) (11b) and the dies (11a) (11b) are positioned in the left-right direction, the lifting cylinders (21a) (21b) Rod (23
a) (23b) protrudes. This lifting cylinder (21a) (21
The protrusion of the rods (23a) (23b) in (b) causes the die (1
The lower clampers (26a) (26b) are moved to the molds (1a) (1b) at the same time as the 1a) (11b) is lifted from the support roller (6), and at the same time, the lower clampers (26a) (26b) are interlocked with the projecting operation of the rods (23a) (23b). ), The upper clamper (25a) (25b) moves symmetrically downward while being in contact with the lower edge portions (29a ') (29b'). Then, the upper clampers (25a) (25b) come into contact with the upper edges (29a) (29b) of the molds (11a) (11b), and at the same time, the platens (1a) (1b) and the molds (11a) (11b). ) And the center lines (a) and (b) coincide with each other, and in this state, the upper and lower clampers (25a) to (26b) are actuated to move the upper and lower edges (29a) (29a) of the molds (12a) (12b). ′) (29b) (29b ′) is clamped and small size mold (11a) is attached to the platen (1a) (1b)
(11b) is detachably attached.

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 large parts. It can be widely used when fixing a die to be used.

〔The invention's effect〕

According to the present invention, the lifting means is operated to lift the mold,
By interlocking with this, the upper and lower clampers can be moved up and down symmetrically to attach and remove the large and small molds to the platen, so the mold replacement work can be performed easily and quickly. It is possible to significantly improve the sex.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of the device of the present invention, FIG. 2 is a schematic side view showing an operation procedure of the device of the present invention, and FIG. 3 is a horizontal sectional view showing a mounting state of upper and lower clampers. . FIG. 4 is a schematic side view of the conventional apparatus, FIG. 5 is a schematic front view of the conventional apparatus on the movable platen side, and FIGS. 6 and 7 are for explaining problems when a small-sized mold is attached. FIG. (1a) (1b) ...... Platen, (2a) (2b) (11a) (11b) …… Mold, (6) …… Support roller, (21a) (21b) …… Lifting means, (25a) ( 25b) …… Upper clamper, (26a) (26b) …… Lower clamper.

Claims (1)

[Claims] 1. A platen which is held upright and on which a mold is detachably mounted, and a plurality of support rollers which are rotatably mounted on a lower part of the platen and which support the mold so as to be movable in a horizontal direction. And an elevating means arranged at the lower end of the platen and elevating and lowering the mold supported by a supporting roller, and an upper and lower part of the platen can be symmetrically moved up and down in conjunction with the operation of the elevating means. And a plurality of upper and lower clampers for clamping the upper and lower portions of the mold, wherein the lower clamper is held on a substantially horizontal plane with the supporting roller at the lower end position. Fixing device for injection molding machine.