JPH059137Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a mold for an injection molding machine, and more particularly to a mold for an injection molding machine used for injection molding of thermoplastic resin.

(Prior art) An injection mold for a thermoplastic resin injection molding machine is generally installed between a fixed platen and a movable platen of the injection molding machine, and one mold is used for each molded product. type is used.

There are various types of such molds, and the optimal one is adopted from the viewpoint of the shape of the molded product to be manufactured, work efficiency, etc., and the following molds are representative examples: .

Two-plate type: A pair of templates, consisting of a fixed template and a movable template, are installed between the fixed side mounting base attached to the fixed platen and the movable side mounting base attached to the movable platen. ing.

In such a mold, a molded part, a runner part,
and a gate portion are provided on the dividing surfaces of both molds.

3-plate mold The mold consists of a fixed mold that includes a fixed side mounting base, a runner removal plate, and a fixed side mold plate, and a movable mold that includes a movable side template and a movable side mounting base.

In such a mold, the molded part is provided on the dividing surface between the fixed mold and the movable mold, and the runner section and the gate section are provided on the dividing surface between the runner extraction plate and the stationary mold plate.

When taking out the product from this mold, the runner part and the molded product are separated by separating the runner removal plate and the fixed side plate, and the molded product is taken out from the dividing plane between the fixed mold and the movable mold. . On the other hand, the runner is removed from the dividing surface between the runner removal plate and the stationary template.

Nested mold A mold in which a cavity mold and a core mold are inserted into the insertion holes of a pair of templates, a fixed side template and a movable side template, so that changes in the molded product can be made. This can be handled by respectively converting the cavity type and core type inserted as children.

(Problem to be solved by the invention) In the above-mentioned mold, two-plate mold or three-plate mold
In a plate-type mold, when changing the molded product, it is necessary to replace the entire pair of templates.

In this regard, in the nested mold, changes in the molded product can be handled by replacing the cavity mold and the core mold, which are inserted into a pair of mold plates as nests.

However, in any type, in order to replace a 2-plate mold with a 3-plate mold, or a 3-plate mold with a 2-plate mold, it is necessary to replace the entire mold. Work efficiency is significantly lower.

Moreover, it is necessary to prepare various molds,
The ratio of mold cost to molded product cost increases.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mold for an injection molding machine that can easily change the model without replacing the entire mold and does not require the preparation of various molds.

(Means for Solving the Problems) The poor working efficiency during type conversion in the conventional molds described above can be solved by the mold for an injection molding machine of the present invention having the following configuration.

That is, the present invention includes a fixed mold including a fixed side mount having a resin injection hole, a runner removal plate, and a fixed side mold plate into which a nested mold is inserted, a movable side mount,
and a movable mold including a movable mold plate into which a nesting mold is inserted,
In order to use the mold as a two-plate type mold, the mold is installed between the walls of both sides of the fixed-side mount and the fixed-side mold plate, and is attached to the fixed-side mount with a runner removal plate interposed. A mold for an injection molding machine characterized by having a tightening means for tightening a stationary side template.

In the present invention, the clamping means is provided so as to protrude outward from a pair of opposite side walls of the stationary mold plate, and the surface facing the movable mold is formed on the surface to be clamped. a pair of fastening fittings each having a protrusion, a pair of fastening metal fittings that are attached to opposite side walls of the fixed side mounting base and that come into contact with the tightened surfaces of the engagement protrusion; and a tightening bolt that connects the pair of tightening fittings, and when the tightening bolt is tightened in a direction in which the pair of tightening fittings approach each other, the tightened surface of the engagement protrusion and the tightening The fixed side mold plate can be tightened to the fixed side mount via the clamping surface of the metal fitting, so that the type of the mold can be easily changed.

Further, the tightening surface and the tightening surface of the tightening means may be formed into tapered surfaces facing each other, and/or the pair of tightening fittings may extend outward from both side walls of the fixed side mounting base. The tool is movably guided by a guide pin with a head that protrudes from the tool, and can be rotated by inserting the tip of the tool from the outside into the head that is substantially embedded in one of the fastening fittings. By turning the tightening bolt in the direction that separates the pair of clamping brackets, the clamping bracket can be fixed to the head of the head-equipped guide pin, making it easier to change the mold model. It can be done more easily.

(Function) According to the mold for an injection molding machine of the present invention, the fixed side mold plate and the runner removal plate can be tightened to the fixed side mounting base by the tightening means to be used as a two-plate mold. Furthermore, it can also be used as a three-plate mold by releasing the tightening.

Moreover, at this time, the mold type can be exchanged by replacing only the cavity mold and core mold, which are inserted into the respective mold plates as nested molds, with ones that are compatible with the type to be used.

As described above, according to the mold of the present invention, it is possible to easily change the mold type without replacing the entire mold.

(Example) The present invention will be explained in more detail using the drawings.

FIG. 1 shows an example in which the mold of the present invention is used as a two-plate mold.

In Fig. 1, a runner removal plate 2 and a fixed side mold plate 3 are fixed to a fixed side mounting base 1 attached to a fixed platen 13 to constitute a fixed mold, and a movable side mold plate 4 is attached to a movable platen (Fig. A movable type is constructed by being fixed to a movable side mount (not shown) attached to a movable side mount (not shown).

The fixed side mount 1 is provided with a resin injection hole 15, and when the nozzle 14 of the injection molding machine passes through the nozzle insertion hole of the fixed platen 13 and touches the fixed side mount 1, the molten resin flows into the resin injection hole. 15 into the mold.

Furthermore, the cavity mold 5 inserted into the insertion hole of the fixed side template 3 and the core mold 6 inserted into the insertion hole of the movable side template 4 are either the fixed side template 3 or the movable side template. It is nested in 4 and can be replaced.

In addition, near the outer periphery of the molten resin passage from the resin injection hole 15 to the gate, a heat insulating means such as a heater is installed as a nest in the cavity mold and core mold inserted into the insertion holes of a pair of templates. are each provided with a fixing means.

1 facing each other of the stationary side mold plates 3 shown in FIG.
An engaging protrusion (hereinafter referred to as 1) extending outward from both walls of the pair
A pair of protrusions (sometimes referred to as a pair of protrusions) 30 and 31 are provided in a protruding manner, and the side surface in the direction of the movable mold is cut into a tapered shape.

On the other hand, on the inner surface of the recess of the pair of fasteners (hereinafter sometimes referred to as a pair of presser metal fittings) 7 and 8 attached to both opposing sides of the fixed side mounting base 1, the movable type The inner surface in the direction is tapered.

The tapered surfaces formed on the pair of convex portions 30 and 31 are tightened surfaces against which the tapered surfaces formed on the pair of presser fittings 7 and 8 come into contact.

Note that the tapered surfaces formed on the pair of presser fittings 7 and 8 serve as tightening surfaces for the surfaces to be tightened formed on the pair of convex portions 30 and 31.

In FIG. 1, the pair of convex portions 30, 31
The surface to be tightened contacts the clamping surfaces of the pair of presser fittings 7 and 8, and the fixed side mold plate 3 is tightened to the fixed side mounting base via the runner extraction plate 2, resulting in a two-plate mold. used as a type.

The pair of presser fittings 7 and 8 will be explained with reference to FIG. FIG. 2 is a sectional view taken along the line AA in FIG. 1.

In FIG. 2, the pair of presser fittings 7 and 8 are connected by a tightening bolt 20 passing through the fixed side mount 1, and a headed guide pin 39a is provided to protrude from the fixed side mount 1. , 39b, 49a, 49b
You are guided to move freely. Further, the head of the tightening bolt 20 is substantially embedded in the presser fitting 8 and is rotatable by inserting the tip of a tool into the head from the outside, while the head-equipped guide The pins 39a to 49b have their heads larger than the diameters of the guide holes of the presser fittings 7, 8 and protrude from the surfaces of the presser fittings 7, 8 so as to protrude from the fixed side mounting base 1.

A pair of presser fittings 7 installed in this way,
8 moves the headed guide pins 39a to 49b in mutually opposite directions by rotation of the tightening bolt 20;
That is, the pair of presser fittings 7 and 8 can be moved toward or away from each other, and the pair of convex portions 3
The clamping surfaces of the 0 and 31 clamping surfaces and the clamping surfaces of the pair of presser fittings 7 and 8 can be brought into contact with each other or separated from each other.

In order to substantially embed the head of the tightening bolt 20 in the presser metal fitting 8 and to enable the tightening bolt 20 to rotate by inserting a tool tip into the head from the outside, the presser metal fitting 8 is 8a, Divide into 8b parts, 8
embed the head of the tightening bolt 20 in the part b, then drill a through hole 21 in the part 8a, which is smaller than the maximum diameter of the bolt head and allows the tip of a tool such as a hex wrench to pass through; Part 8a and 8b
Bolt the parts with bolts 19.

At this time, it is preferable that the head of the tightening bolt 20 faces the operating surface of the injection molding machine, as this makes it easier to change the mold type.

In addition, the tightening bolt 20 passing through the fixed side mounting base 1
The position of is the runner hole 17, 1 through which the molten resin passes.
8 or the like, and does not necessarily have to be near the center of the fixed side mount 1.

The runner removal plate 2 used in the mold shown in FIG. 1 may be the one used in the conventional three-plate mold.

Further, the planar shape of the pair of presser fittings 7 and 8 may be made into a U-shape so that the fixed side template 3 can be fixed on all sides, and the planar shape of the presser metal fittings 7 and 8 may be made to match. The planar shape of the pair of convex portions 30 and 31 may also be U-shaped.

Next, the operation of the mold according to this embodiment will be explained.

Insert a hexagonal wrench or the like into the through hole 21 provided in the portion 8a that constitutes the presser metal fitting 8, rotate the tightening bolt 20, and move the pair of presser metal fittings 7 and 8 in a direction toward each other. A pair of presser fittings 7, 8
As shown in FIG. 1, the fixed side template 3 is fixed via the runner plate removal plate 2 by bringing the tightening surface of the pair of protrusions 30 and 31 into contact with the tightened surfaces of the pair of protrusions 30 and 31. It can be tightened to the side mounting base 1.

The fixed side template 3 and the movable side template 4 in this state
The mold is clamped, and then the nozzle 14 of the injection molding machine
The nozzle touches the resin injection hole 15 of the fixed side mount 1, and molten resin is injected into the mold.

After the injected resin has solidified, the space between the movable mold plate 4 and the fixed mold plate 3 is opened, and the molded product 12 with the sprue 16 is pushed out from the core mold 6 of the movable mold plate 4 with the ejecting pin 11. . In this way, when the clamping surfaces of the pair of fittings 7 and 8 and the clamping surfaces of the pair of protrusions 30 and 31 are joined, it can be used as a two-plate mold.

FIG. 3 shows an example in which the clamping surfaces of the pair of fittings 7 and 8 and the clamping surfaces of the pair of protrusions 30 and 31 are separated and used as a three-plate mold.

In order to convert the two-plate mold shown in FIG. 1 to the three-plate mold shown in FIG. Insert and tighten bolt 20
, and move the pair of metal fittings 7 and 8 in directions away from each other to separate the clamping surfaces of the pair of presser metal fittings 7 and 8 from the surfaces to be tightened of the pair of convex portions, and fix them. Release the fixed mold plate 3 and runner removal plate 2 from the mold mount 1.

The operation of the pair of presser fittings 7 and 8 will be explained using FIG. 2. When a hexagonal wrench is inserted through the through hole 21 and turned to the left, the tightening bolt 20 is pushed out from the holding metal fitting 7 toward the holding metal fitting 8, and one of the pair of holding metal fittings, for example, the holding metal fitting 8, is inserted into the headed guide pin. It is moved in the direction of the heads of 39a and 39b.

In this way, one of the pair of presser metal fittings (presser metal fitting 8)
While the presser is moving, the other presser metal fitting (presser metal fitting 7) is in a stationary state.

Next, the presser metal fitting 8 is attached to the head guide pin 39a,
After moving to the head of 39b, further tighten the tightening bolt 2.
When 0 is turned to the left, the presser metal fitting 8 can no longer be moved, so the tightening bolt 20 is pushed out from the presser metal fitting 7 and the presser metal fitting 7 is attached to the head guide pin 49.
a, 49b in the direction of the head.

The movement of the presser metal fitting 7 is completed when it moves to the heads of the headed guide pins 49a, 49b.

In this way, the pair of presser fittings 7, 8 and the pair of protrusions 30, 31 are separated when the pair of presser fittings 7, 8 moves to the heads of the headed guide pins 39a to 49b. In this state, the pair of presser fittings 7 and 8 are attached to the head-mounted guide pins 39a to 49b.
It is fixed near the head of the machine to prevent rattling during injection molding operations.

The pair of presser fittings 7 and 8 and the pair of protrusions 3
0 and 31 are the respective separation distances from the presser metal fittings 7 and 8.
It is sufficient that there is a gap of several millimeters between the tips of the protrusions 30 and 31.

Note that when converting from the 2-plate mold shown in Figure 1 to the 3-plate mold shown in Figure 3, the cavity mold 5 and core mold 6 for the 2-plate mold are replaced with the 3-plate mold. The mold is changed to a cavity mold 35 and a core mold 36.

In the three-plate mold shown in FIG. 3, when taking out the molded product, the space between the runner take-out plate 2 and the stationary side mold plate 3 is first opened by the biasing force of the spring 23, and the runner lock pin 40 is opened. Therefore, the runner 10 attached to the runner removal plate 2 and the movable side template 3
The molded product 12 that moves together with the cutter is cut.

Further, before the spring 23 is fully extended, the end of the rod-shaped body 24 reaches the side surface of the runner removal plate 2, and as the spring 23 stretches, the runner removal plate 2 is separated from the surface of the fixed side mounting base 1. At this time, the runner 10 moves together with the runner removal plate 2, and the runner lock pin 40
Since the runner 10 is removed from the mold, the runner 10 can be taken out of the mold.

Next, after the spring 23 is fully extended, the fixed mold plate 3 and the movable mold plate 4 are opened, and the molded product 12 is extruded from the core mold 6 by the protruding pins 11.

The present invention consists of a pair of presser fittings 7 and 8 as described above.
Examples thereof are shown in FIGS. 4 and 5.

In FIG. 4, between the fixed platen 13 and the movable platen (not shown) of the injection molding machine, a fixed side mounting base 1, a runner extraction plate 2, a fixed side mold plate 3, a movable side mold plate 4,
and a movable-side mounting base 21, and the cavity mold 5 of the fixed-side mold plate 3 and the core mold 6 of the movable-side mold plate 4 are attached to the fixed-side mold plate 3 or the movable-side mold plate. It is inserted as a nest in 4.

The fixed platen 13 has a hole through which the nozzle 14 of the injection molding machine is inserted, and the fixed side mounting base 1 has a hole through which the nozzle 14 of the injection molding machine is inserted.
A resin injection hole 15 is provided through which a nozzle 4 injects molten resin into the mold.

When such a nested mold is used as a two-plate mold, the runner removal plate 2 and fixed side mold plate 3 are fixed to the fixed side mounting base 1 with a plurality of bolts 22, as shown in Fig. 4. and use it.

In such a two-plate mold, after the resin injected into the mold solidifies, the stationary mold plate 3 and the movable mold plate 4 are opened, and the molded product to which the sprue 16 is attached is taken out.

In addition, when the two-plate mold shown in FIG. 4 is used as a three-plate mold, the bolts 22 are removed, and the cavity mold 5 and core mold for the two-plate mold are removed, as shown in FIG. By changing 6 to a cavity mold 35 and a core mold 36 for a three-plate mold, the fixed mold plate 3 and the movable mold plate 4 can be used without replacing their main bodies.

When removing a molded product from such a three-plate mold, first the space between the runner removal plate 2 and the stationary mold plate 3 is removed by the biasing force of the spring 23 inserted into the rod-shaped body 25 shown in FIG. opens, and before the spring 23 is fully extended, the end of the rod-shaped body 24 moves from the bottom of the hole 26 together with the stationary side mold plate 3, and the runner removal plate 2 is removed.
, and the runner removal plate 2 is also pulled away from the fixed side mounting base 1 by the biasing force of the spring 23.
At this time, the runner 10 is removed from the mold.

Next, after the spring 23 is fully extended, the fixed template 3 and the movable template 4 are opened, and the molded product is taken out. The molded product to be taken out does not have any sprues or runners attached to it.

Although the above explanation has been made regarding a horizontal injection molding machine, the present invention can also be applied to a vertical injection molding machine.

(Effects of the invention) According to the invention, it is possible to change the model of a nested mold without replacing the entire mold, so that work efficiency can be significantly improved.

Moreover, since it is not necessary to prepare various types of molds, the ratio of mold cost to molding cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a mold showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the plane A-A in FIG. 1, and FIG. 3 is a mold shown in FIG. 1. A vertical cross-sectional view of the mold, and FIGS. 4 and 5, showing other aspects of
FIG. 3 shows vertical cross-sectional views of conventional molds. In the figure, 1... Fixed side mounting base, 2... Runner removal plate, 3... Fixed side template, 4... Movable side template, 5, 35... Inserted into fixed side template 3. Nested mold, 6, 36... Nested mold inserted into the movable template plate 4, 7, 8... A pair of clamping fittings, 20...
...Tightening bolt, 30, 31...Engaging protrusion, 39,
49...Guide pin with head.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A fixed mold including a fixed side mounting base having a resin injection hole, a runner removal plate, and a fixed side mold plate into which a nested mold is inserted, a movable side mounting base, and a fixed side mold plate in which a nested mold is inserted. In a three-plate mold comprising a movable mold including a movable mold plate into which a child mold is inserted, in order to use the mold also as a two-plate mold, the fixed side mounting base and the fixed side mount are used. A mold for an injection molding machine, characterized by having a tightening means provided between both side walls of a side mold plate, and tightening the fixed side mold plate to the fixed side mounting base with a runner removal plate interposed therebetween. . 2 The tightening means are opposite to each other on the fixed side template 1
an engaging protrusion that protrudes outward from a pair of both side walls and whose surface facing the movable die is formed on the surface to be tightened; The tightening device is composed of a pair of tightening fittings having a tightening surface that comes into contact with the tightened surface of the protrusion, and a tightening bolt that passes through the fixed side mounting base and connects the pair of tightening fittings. When tightening the mounting bolt in the direction in which the pair of fastening fittings approach each other, the fixed side template is pressed against the fixed side mounting base through the tightened surface of the engagement protrusion and the tightening surface of the tightening fitting. The injection molding machine fitting according to claim 1, which is tightenable. 3. The mold for an injection molding machine according to claim 2, wherein the clamped surface and the clamping surface are formed as tapered surfaces facing each other. 4 A pair of fastening fittings are movably guided by headed guide pins that protrude outward from both side walls of the fixed side mounting base, and are substantially buried in one of the fastening fittings. By inserting the tip of the tool into the head from the outside and turning the rotatable tightening bolt in the direction that separates the pair of tightening fittings, the tightening fittings can be attached to the head. The mold for an injection molding machine according to claim 2, wherein the mold is fixable to the head of the guide pin.