JP3594396B2 - Die fall prevention mechanism in injection molding machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mold drop prevention mechanism in an injection molding machine having a mold clamping mechanism for attaching a mold to a fixed or movable plate, that is, a mold plate in the injection molding machine.
[0002]
[Prior art]
In recent years, as a means for attaching a mold to a fixed or movable plate of an injection molding machine, that is, a mold, it is possible to automate the attachment and detachment of the mold instead of fixing the mold to the mold mounting surface of the mold with bolts A mold clamping mechanism is frequently used. However, when the mold clamping mechanism is used, there is a possibility that the mold may fall due to an unexpected situation such as a failure in the mold clamping mechanism. It is designed so that the mold does not fall even if an unexpected situation such as a failure occurs. An example of a conventional mold drop prevention mechanism will be described below.
[0003]
As shown in FIGS. 3A and 3B, the mold plate of the injection molding machine moves forward and backward with respect to a fixed plate 101 fixed on a base (not shown) and a fixed plate 101 guided by a tie bar 103. The fixed plate 101 and the movable plate 102 have a plurality of mold clamping mechanisms 108 for attaching a mold, and a mold receiving member 109 and a movable plate 102. A mold drop prevention mechanism including a mold holding fitting 106 is provided.
[0004]
The movable plate 102 shown in FIG. 3B will be described by way of example. The two side edges of the mounting plate 105a of the movable die 105 are locked from above the movable plate 102 with the respective mold clamping mechanisms 108. Each of the mold clamping mechanisms is slid between the member 108a and the mold mounting surface 102a, and the lower end surface thereof is placed on a mold receiving fitting 109 fixed to the mold mounting surface 102a by a bolt 110. The stop member 108a is tightened and clamped, and the mold holding metal member 106 movably guided along the T-shaped groove 107 extending in the horizontal direction formed on the mold mounting surface 102a is moved along the T-shaped groove 107. After being moved and engaged with the mounting plate 105a of the movable mold 105, the bolt 106a is tightened and fixed, so that the mold clamping mechanism 108 fails and the locking member 108a does not operate properly. Movable mold 105 is devised so as not to fall even me.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional technique, there is a problem that it takes time to tighten the bolts and fix the mold holding metal fittings, so that the mold attaching work takes time.
[0006]
The present invention has been made in view of the above-mentioned problems of the conventional technology, and has as its object to realize a mold drop prevention mechanism in an injection molding machine that can perform a mold mounting operation in a short time. Is what you do.
[0007]
[Means for Solving the Problems]
To achieve the above object, a mold drop prevention mechanism in an injection molding machine of the present invention is an injection molding machine having a plurality of mold clamping mechanisms for clamping a mold on a mold mounting surface of a mold board. A mold receiving bracket for supporting a lower end surface of the mold fixed to a lower portion of the mold mounting surface; and a center portion from an upper portion of both side edges formed on the mold mounting surface to a central portion. A pair of inclined T-shaped grooves extending at a downward slope, a shaft portion (6b), and a fitting flange portion movably fitted into the T-shaped groove at one end thereof and the other end thereof. And a holding fitting having a locking flange that engages with the mold. The fitting fitting flange of the holding fitting is inserted into each of the two T-shaped grooves to extend along the two T-shaped grooves. The locking flange is engaged with the mold and held by sliding down. It is intended to.
[0008]
[Action]
The holding fittings respectively guided by a pair of inclined T-shaped grooves extending downward from the upper part of the both side edges toward the center part formed on the mold plate slide down by the gravity, and the molds of the mold are slipped. The mold is held by always engaging the mounting plate from both sides.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described.
[0010]
FIG. 1 shows an embodiment of a mold drop prevention mechanism in an injection molding machine according to the present invention. FIG. 1 (a) is a schematic partial side view of a mold plate provided with the mold fall prevention mechanism, and FIG. It is a schematic cross section along the AA line of a).
[0011]
As shown in FIG. 1A, the mold plate is composed of a fixed plate 1 fixed on a base (not shown) and a movable plate 2 which can move forward and backward with respect to the fixed plate 1 guided by the tie bar 3. A plurality of (four in this embodiment) mold clamping mechanisms 8 for clamping the molds are arranged on the mold mounting surfaces 1a and 2a of the fixed platen 1 and the movable platen 2, respectively.
[0012]
In the present embodiment, the mold clamping mechanism 8 may be of any type in which the locking member 8a is tightened or released by manual operation or by a hydraulic cylinder. Have been.
[0013]
As shown in FIG. 1B, a mold receiving member 9 for supporting the movable mold 5 is fixed to a lower portion of the mold mounting surface 2a of the movable platen 2 with bolts 10. In addition, a pair of inclined T-shaped grooves 7 are formed on the mold mounting surface 2a of the movable platen 2 so as to extend downward from the upper portions of the both side edges toward the center portion. The fitting groove 6c of the holding metal fitting 6, which will be described later, is slidably fitted in each of the groove-shaped grooves 7.
[0014]
As shown in FIG. 2, the holding fitting 6 has a cylindrical shaft portion 6b and a disc-shaped fitting flange portion 6c which is slidably fitted in the T-shaped groove 7 at one end thereof. On the other end side, a disk-shaped locking flange 6a having a diameter larger than that of the fitting flange 6c is provided.
[0015]
In the present embodiment, both side edges of the mounting plate 5a of the movable mold 5 are slid from above the movable plate 2 in the drawing between the locking members 8a of the mold clamping mechanisms 8 and the mold mounting surface 2a. The locking members 8a of the mold clamping mechanisms 8 are tightened and clamped while the lower end surface is placed on the mold receiving fitting 9. Next, a pair of inclined T-shaped grooves 7 extending downward from the upper part of both side edges to the center part of the mold mounting surface 2a of the movable platen 2 into the inclined T-shaped grooves 7 for fitting the holding fittings 6 respectively. 6c, and both holding fittings 6 are slid down along the T-shaped groove 7 by gravity, so that the locking flange 6a is engaged with the mounting plate 5a of the movable mold 5 so that the movable metal fitting 6 is engaged. The mold 5 is held.
[0016]
As is apparent from the above description, in the present embodiment, the fitting 6 is fitted to the pair of inclined T-shaped grooves 7 only by fitting the fitting flanges 6c of the holding fitting 6 to the holding fitting 6 by gravity. Along the T-shaped groove 7, and is constantly pressed against the movable platen 2 toward the mounting plate 5a of the movable mold 5 clamped by the mold clamp mechanism 8. For this reason, it is not necessary to perform bolting unlike the above-mentioned conventional mold holding metal fittings.
[0017]
Since the mold drop prevention mechanism and the mold clamp mechanism provided on the fixed platen 1 may be exactly the same as the mold drop prevention mechanism and the mold clamp mechanism provided on the movable plate 2 described above, the same reference numerals are used. The description is omitted.
[0018]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0019]
A pair of inclined T-shaped grooves are provided on the mold mounting surface of the mold plate, extending downward from the upper part of both side edges toward the central part, and a pair of the T-shaped grooves are provided in each of the T-shaped grooves. The fitting flange is always engaged with the mold clamped by the mold clamping mechanism on the mold mounting surface by simply inserting the fitting flange and sliding down by gravity. Unlike the conventional metal mold holding fixture of the related art, there is no need for bolt tightening, and the mold mounting time can be significantly reduced.
[Brief description of the drawings]
FIGS. 1A and 1B show an embodiment of a mold drop prevention mechanism in an injection molding machine according to the present invention, wherein FIG. 1A is a schematic partial side view of a mold plate provided with the mold fall prevention mechanism, and FIG. It is a schematic cross section along the AA line of (a).
FIGS. 2A and 2B show a holding bracket in the mold drop prevention mechanism shown in FIG. 1, wherein FIG. 2A is a schematic plan view and FIG. 2B is a schematic side view.
FIG. 3 shows an example of a mold drop prevention mechanism in a conventional injection molding machine. FIG. 3 (a) is a schematic partial side view of a mold plate in an injection molding machine provided with the mold fall prevention mechanism, and FIG. It is a schematic cross section along the AA line of (a).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed board 2 Movable board 1a, 2a Die mounting surface 3 Tie bar 4 Fixed side die 5 Movable side die 5a Mounting plate 6 Retainer 6a Locking flange 6b Shaft 6c Fitting flange 7 T-shaped Groove 8 Mold clamping mechanism 8a Locking member 9 Mold receiving bracket 10 Bolt

Claims (1)

In an injection molding machine provided with a plurality of mold clamping mechanisms (8) for clamping the molds (4, 5) to the mold mounting surfaces (1a, 2a) of the mold plates (1, 2),
A mold receiving bracket (9) for supporting a lower end surface of the mold (4, 5) fixed to a lower portion of the mold attaching surface (1a, 2a); and a mold attaching surface (1a, 2a). 2a), a pair of inclined T-shaped grooves (7) extending downward from the upper part of the both side edge parts toward the central part, and the shaft part (6b) and the T-shaped groove at one end side. It has a fitting flange (6c) that is movably fitted into the U-shaped groove (7), and has a locking flange (6a) that engages with the mold (4, 5) at the other end. A holding metal fitting (6) is provided, and the fitting flange (6c) of the holding metal fitting (6) is inserted into each of the two T-shaped grooves (7), and along the both T-shaped grooves (7). Wherein the locking flange (6a) is engaged with and held by the molds (4, 5). Prevention mechanism.

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