JPH043776Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a molding die.

(Prior art) Conventionally, in order to perform multi-cavity molding by inserting a plurality of nested molds into a set of mold bases, the mold base has a set of molds corresponding to the number of nested molds to be inserted. A plurality of fitting holes are formed, and a nesting mold is inserted into each fitting hole and fixed by appropriate fixing means. To fix it in this fitting hole, use the two sides of the fitting hole as reference planes, and press the nesting die with the clamp piece of the clamp device so that the two sides of the nesting die are in contact with these reference planes. (JP-A-Sho)
61-27211).

(Problem that the invention aims to solve) However, in the conventional molding mold mentioned above, multiple fitting holes are drilled in the mold base according to the number of insert molds, so processing of the mold base is complicated. As a result, processing costs also increase. In addition, a clamp device for fixing each nesting mold to the fitting hole must be provided for each fitting hole, which not only makes the molding die increasingly complicated, but also causes problems in that it takes time to replace the nesting mold. .

Moreover, since the plurality of fitting holes are formed at regular intervals, the mold base becomes large, and the injection molding machine itself to which this mold is attached inevitably becomes large.

Therefore, the present invention has been devised to solve the above-mentioned problems, and its purpose is to provide a molding die that can simplify the processing and structure of the mold base and miniaturize the device. .

(Summary of the invention) In order to solve the above problems, the present invention has the following configuration.

A molding tool in which a plurality of sets of nested molds are inserted into a set of mold bases from a direction perpendicular to the mold opening/closing direction of the mold, each of which is inserted in contact with the wall surface of an adjacent nested mold. a presser member which is a mold and which abuts across a plurality of sets of nesting molds disposed facing the nesting mold insertion opening of the mold base and has tapered surfaces formed at both ends; and the presser member. It has a tapered surface corresponding to the tapered surface of the pressing member, and is disposed on the mold base so as to be able to move forward and backward with respect to the pressing member by an appropriate actuator, and when the actuator is driven, the pressing member is pressed by the tapered surface. It is characterized by comprising a pair of clamp pieces that are pushed in the tightening direction of the insert mold.

In the present invention having such a configuration, a cooling water circuit extending inside the nested mold in the tightening direction of the nested mold is connected to the nested mold that is joined and inserted into the mold base. A cooling circuit is formed within the nesting mold by connecting the bases, between the nesting molds, and between the nesting mold and the holding member with removable male and female couplers. When it is necessary to cool the child mold, it is possible to easily and reliably connect the cooling circuit in the nested mold to the cooling circuit on the mold body side at the same time as tightening and fixing the nested mold.

(Operation) Insert the nesting mold into the U-shaped space of the mold base with the wall surface touching. When the clamp cylinder serving as the actuator is driven, the pressing member is pushed by the slope of the clamp piece, thereby simultaneously tightening and fixing a plurality of nested molds.

In addition, the nested mold can be inserted into the mold base from a direction perpendicular to the mold opening/closing direction, so by opening the mold to the extent that a gap is formed that allows the nested mold to move in and out, You can perform work such as replacing.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the overall outline of the molding die will be explained.

In FIG. 1, 30 is a fixed type, 31 is an intermediate type, and 32 is a movable type. Fixed type 30 is fixed platen 3
3, and a runner stripper plate 36 connected to the fixed base 34 by a limiting bolt 35 so as to be movable in a predetermined stroke.

The intermediate mold 31 is constructed by fitting and fixing four nesting molds 38 into a U-shaped space of an intermediate mold base 37 whose front shape is approximately U-shaped by a fixing mechanism to be described later. 39, it is connected to the runner stripper plate 36 so that it can move in and out of the runner stripper plate 36 by a predetermined stroke. Further, the intermediate mold 31 is urged in a direction away from the runner stripper plate 36 by a spring 40.

The movable mold 32 includes a movable platen 41 that is moved toward and away from the intermediate mold 31 and the fixed mold 30 by an appropriate hydraulic cylinder (not shown), a movable mold base 42 fixed to the movable platen 41, and a movable mold base 42 that is fixed to the movable platen 41. A movable nesting mold 43 is provided to be fixed to the U-shaped portion of the movable mold base 42 by a fixing mechanism to be described later. Note that this movable mold 32 is also connected to the intermediate mold 31 by a limiting pin 44 so as to move toward and away from the intermediate mold 31 by a predetermined stroke.

A molding cavity 45 is defined by the nesting mold 38 of the intermediate mold 31 and the movable nesting mold 43 opposing thereto. In the illustrated example, the pair of nesting molds 38' and movable nesting molds 43' are shown as substitute nesting molds that do not form any cavities.

Reference numeral 46 denotes a protruding pin for ejecting the molded product, which is inserted through the movable nesting die 43, and is protruded by a protruding rod 48 driven against the biasing force of a spring 47.

Next, 49 is a hot runner block,
It is disposed within the above-mentioned fixed mold 30 with a heat insulating material 50 interposed therebetween. One end of this hot runner block 49 faces a nozzle entry hole 51 provided in the fixed platen 33, and is touched by a nozzle 52. The other end of the hot runner block 49 is branched, and each branched end projects from the fixed mold base 34 toward the corresponding nested mold 38 of the intermediate mold 31.

A sprue bush 53 is formed in a cap shape to cover each branch end of the hot runner block 49, and is fixed to the fixed base 34 by a fixing plate 54 at its base end. An undercut portion 55 for locking the runner branch is provided around the outer periphery of the tip of the sprue bush. Also, at the tip of the sprue bush 53, there is a hot runner block 4.
A resin path 57 communicating with the hot runner 56, which is the resin path No. 9, is opened. The sprue bushing 53 is fitted into a through hole 58 provided in the runner stopper plate 36, and when the mold is closed as shown in FIG. It is set to protrude from the surface of 36.

On the other hand, the above-mentioned runner stopper plate 3 is provided on the outer surface of the nested mold 38 of the intermediate mold 31 when the mold is closed.
6 a recess 5 having a depth and width sufficient to cover the tip of the sprue bush 53 protruding from the surface;
9 is formed. A runner 6 communicates the recess 59 and the cavity 45 via a gate.
0 is formed. In this case, the gate position can be varied within the range of the width of the recess 59, which has a relatively wide area, so when replacing the nesting mold 38 according to various molded products, there is freedom in designing the gate position. The degree becomes large. A recess 59' similar to the recess 59 described above is also formed on the back surface of the substitute nesting mold 38'. As shown in the figure, a dummy runner branch is formed by this recess 59' each time the molding is performed.

FIG. 3 shows a nested fixing mechanism. In addition, since the fixing mechanism of the nested mold in the movable mold 32 and the intermediate mold 31 is the same, the fixing mechanism in the movable mold 32 is shown in the figure.

The four movable nesting molds 43 have a rectangular front external shape, and are built into the U-shaped space of the movable mold base 42 in two rows with their wall surfaces in contact with each other.

Further, the upper and lower surfaces of the movable nesting mold 43 are formed into step-like stepped surfaces, and the adjacent upper and lower movable nesting molds 43 are engaged with each other on the stepped surfaces (FIG. 1). The convex portion on the upper surface of the upper movable nesting mold 43 slides into a groove provided on the wall surface of the movable mold base 42, and the convex portion on the lower surface of the lower movable nesting mold 43 slides into the wall stepped portion 61 of the movable mold base 42.
(Fig. 1). Key grooves 62 are formed in the upper and lower surfaces of the movable nesting mold 43 and the wall step portion 61 of the movable mold base 42 so as to coincide with each other.
By fitting the key 63 into the groove 62, the movable nesting molds 43 are prevented from shifting from each other. One end of the key 63 is locked onto the wall surface of the movable base 42, and the other end is locked into a hole provided in a presser member to be described later (FIG. 3). In the illustrated example, the upper surface of the movable nesting mold 43 in the upper row and the wall surface of the movable mold base 42 are not keyed together, but this portion may also be keyed.

In FIG. 3, reference numeral 64 denotes a holding member, which is slidably guided in the U-shaped opening of the movable mold base 42 along a guide groove 80 (FIG. 4) in the tightening direction of the movable insert mold 43. ing.

Clamp cylinders 65 and 66 are provided at both U-shaped ends of the movable base 42, and their rods protrude into the U-shaped space. Further, clamps 67 and 68 provided at the ends of the rod are formed with slopes, and these slopes abut against the slopes provided on the holding member 64. Therefore, when the clamp cylinders 65 and 66 are driven, the holding member 64 is pushed and the two rows of movable insert molds 43 are simultaneously clamped.

Further, 69 is a clamp cylinder, and its clamp 70 presses the upper surface of the movable nested molds 43 in the upper row to position the movable nested molds 43. Note that this clamp cylinder 69 does not necessarily need to be provided.

71 and 72 are cooling water circuits. Cooling water circuit 7
1 holds the inside of the upper row of movable nesting molds 43 using a pressing member 64.
The movable base 42 is moved back and forth through the turn block 73 fixed to the presser member 64.
It opens into the wall. Similarly, the cooling water circuit 72 holds the inside of the movable nested mold 43 in the lower row using the holding member 64.
The movable base 42 is moved back and forth through the turn block 74 fixed to the presser member 64.
It opens into the wall. A cooling water supply pipe and a cooling water discharge pipe are respectively connected to these openings (not shown).

The cooling water circuits 71 and 72 are provided with removable female circuits between the movable nested mold 43 and the movable mold base 42, between the movable nested molds 43, and between the movable nested mold 43 and the presser member 64. They are connected by a coupler 75 and a male coupler 76. Therefore, when assembling the movable nesting mold 43, if the male and female couplers 75, 76 are placed in predetermined positions and then the movable nesting mold 43 is tightened, the cooling water circuit 71 is installed at the same time as the movable nesting mold 43 is assembled. , 72 are connected.

The present invention is constructed as described above.

Therefore, the movable nesting mold 43 is connected to the movable mold base 42.
To incorporate the four movable nesting molds 43 into the U-shaped space from the U-shaped opening, place the male and female couplers 75, 76 at the positions described above. , insert the key 63 into each key groove 62, attach the presser member 64 to the U-shaped opening, and then operate the clamp cylinders 65, 66 and the clamp cylinder 69. is tightened in the upper right direction in FIG. 3 by clamp cylinders 65 and 66, and is tightened and positioned downward by clamp cylinder 69. At the same time, cooling water circuits 71 and 72 are also connected.

Next, the forming operation will be outlined.

After the mold is clamped, molten resin is injected into the cavity 45 from the nozzle 52 through the hot runner 56, the resin path 57, the recess 59, and the runner 60 to perform molding.

The movable type 3 is moved by driving a hydraulic cylinder (not shown).
2, the intermediate mold 31 is biased by the spring 40, so that the space between the intermediate mold 31 and the runner stripper plate 36 is first opened. Since the runner branch is held by the undercut portion 55 of the sprue bush 53, it is cut from the molded product at the gate portion and remains on the runner stripper plate 36 side.

Similarly, the runner branch corresponding to the substitute nested mold 38' remains on the runner stripper plate 36 side as a dummy runner branch.

When the movable mold 32 is further opened, the intermediate mold 31 is restricted by the restriction pin 39, so that the space between the intermediate mold 31 and the movable mold 32 opens, and the molded product adheres to the movable mold 32. This molded product is ejected by protruding the ejecting pin 46, and is dropped and collected.
The runner branch and dummy runner branch are limited pin 4.
4. As the space between the runner stripper plate 36 and the fixed base 34 opens under the restriction of the restriction pin 39 and the restriction bolt 35, the sprue bush 5 is pushed by the runner stripper plate 36.
3 It falls from the tip and is recovered.

FIG. 5 shows another embodiment of the movable nesting type.

In this embodiment, a concave groove 81 is provided at the center of the upper surface of the movable nesting mold 43, and a convex portion 82 is provided at the center of the lower surface. The vertically adjacent movable nesting molds 43 are engaged with each other by their concave grooves 81 and convex portions 82, and the concave grooves 81 on the upper surface of the movable nesting molds 43 in the upper row are connected to the lower surface of the clamp 70 of the clamp cylinder 69. The protrusions 82 on the lower surface of the movable nesting molds 43 in the lower row fit into the grooves 83 provided on the wall surface of the movable mold base 42. In this manner, in this embodiment, the upper and lower rows of movable nesting molds 43 are built into the U-shaped space of the movable mold base 42 with their wall surfaces in contact with each other. In this embodiment, the movable nesting mold 4
Since the keys 63 and 3 engage in the convex and convex engagement as described above, the key 63 does not shift in the horizontal direction in FIG.
It does not require fixing using. The nested mold 38 of the intermediate mold 31 is similarly constructed.

In addition, in both the above embodiment and this embodiment, if the contact surfaces of the two movable nested molds 43 in the upper row and the lower row are similarly provided so as to engage with each other in the uneven manner, the movable nested molds 43 (the nested molds (same as above) can be further increased in strength.

In addition, in the present invention, the number of movable nesting molds 43 and nesting molds 38 is not limited to four.

(Effects of the invention) As described above, according to the invention, a plurality of nested molds, which are joined and inserted into a mold base from a direction perpendicular to the mold opening/closing direction, can be connected to a single holding member and inserted therein. Tighten at the same time using only a matching pair of clamps,
Can be fixed. Since each nesting mold is inserted with the wall surfaces in contact with each other, the structure of the mold base is simplified, and the mold apparatus and, by extension, the injection molding machine itself can be downsized.

Further, by opening the mold to such an extent that the nested mold can be taken in and out, work such as replacement of the nested mold can be performed, and work such as replacement of the nested mold can be easily performed.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

FIG. 1 shows a preferred embodiment of the mold, and shows a sectional view of the mold in an open state. FIG. 2 is a sectional view of the mold in the closed state, FIG. 3 is a front view of the movable mold, and FIG. 4 is a perspective view of the movable mold. FIG. 5 is a sectional view showing another embodiment. 10... Movable type, 11... Intermediate type, 12... Fixed type, 13... Cavity, 14... Nested type, 1
5... Runner hole, 16... Nozzle, 17... Hot runner block, 18... Reception plate, 19...
Runner groove, 20... Runner stripper plate, 21... Fixed type base, 22... Runner lock pin, 30... Fixed type, 31... Intermediate type,
32... Movable type, 33... Fixed plate, 34... Fixed type base, 35... Limiting bolt, 36... Runner stripper plate, 37... Intermediate type base, 38, 38'... Nested type , 39...restriction pin,
40... Spring, 41... Movable plate, 42...
U-shaped part, 43, 43'...movable nesting type, 44...
...Limiting pin, 45...Cavity, 46...Protruding pin, 47...Spring, 48...Protruding rod, 4
9...Hot runner block, 50...Insulating material, 51...Entry hole, 52...Nozzle, 53...
Sprue bush, 54...Fixing plate, 55...Undercut portion, 56...Hot runner, 57...
...resin path, 58...through hole, 59, 59'...recess,
60...Runner, 61...Wall step, 62...
...Keyway, 63...Key, 64...Press member, 6
5, 66... Clamp cylinder, 67, 68...
Clamp, 69... Clamp cylinder, 70...
Clamp,. 71, 72...cooling water circuit, 73,
74...Turn block, 75...Female coupler, 7
6... Male coupler, 80... Guide groove, 81... Concave groove, 82... Convex portion.

Claims (1)

[Claims for Utility Model Registration] 1. Each of a plurality of sets of nested molds inserted into a set of mold bases from a direction perpendicular to the mold opening/closing direction of the molds is connected to the adjacent nested molds and the wall surface. A molding die that is inserted in contact with a plurality of sets of nested molds arranged facing the nested mold insertion opening of the mold base, and
The holding member has a tapered surface formed on both ends, and a tapered surface corresponding to the tapered surface of the holding member, and is disposed on the mold base so as to be movable forward and backward with respect to the holding member by an appropriate actuator, and the actuator a pair of clamp pieces that, when driven, push a pressing member on the tapered surface in a tightening direction of the insert mold. 2. A cooling water circuit extending inside the nested mold in the tightening direction of the nested mold is inserted between the nested mold and the mold base into the nested mold that is bonded and inserted into the mold base. The molding die according to claim 1, which is a registered utility model, and is formed by connecting the child molds to each other and the nesting mold and the holding member using male and female couplers that can be inserted and removed.