JPH03221A - Injection mold device - Google Patents

Abstract

PURPOSE:To dispense with the cut-off operation of a molded piece in an after process so as to improve an injection mold device of this design in productivity, to save labor, to lessen the molded piece in cost, and to improve it in product quality by a method wherein a cut-off operation is executed in such a manner that the molded piece and a runner section are cut off from each other at a gate. CONSTITUTION:Liquid resin is filled into a molding recess 28 through the intermediary of a sprue 21, a runner 22, and a thinned gate 35, which is cooled down and solidified to form a molded piece 40 in the molding recess 28. When a second parting is opened, a runner piece 9 fixed to a support plate 2 is made to recede and a runner section 42 connected to the molded piece 40 is pushed by a sprue-ejector pin 13, whereby a gate section which connects the runner section 42 with the molded piece 40 is cut off to separate the molded piece 40 from the runner section 42. Then, when a first parting starts opening, a runner ejector plate 8 is pushed by a spring 19 to move forward and the runner section 42 is cut off by a runner ejector pin 16.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an injection mold device, and in particular, a structure in which a runner part and a molded product are separated at a date part by utilizing the opening movement of the mold. The present invention relates to an injection mold device equipped with the following.

(Prior Art and Problems to be Solved by the Invention) In general, an injection mold device has a structure for ejecting the molded product from the molding recess with an ejector bin that reaches the molding recess of the mold. In this case, conventionally, the molded product and the runner part were discharged from the mold while being connected at the gate, and it was necessary to separate the molded product in a later process using a jig or the like. Ta. For this reason, it takes time and effort to obtain the final product, which hinders labor savings.

By performing an operation of separating the molded product and the runner part at the date part when opening the mold, the difficulty of cutting the molded product in the subsequent process can be omitted, improving productivity, saving labor, and reducing costs. The purpose of the present invention is to provide an injection molding mold device that reduces the amount of fuel used and further improves product quality.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes first and second molds forming a molding recess, and forming a boundary between the first and second molds. In addition to the first parting, a second parting is provided in the first mold, and the date part connecting the molded product and the runner part is cut by the mold opening operation of the second parting, The molded product is discharged from the molding recess by the mold opening operation of the first parting.

(Function) In the injection mold device of the present invention, the first mold has a second parting in addition to the first parting that forms the boundary between the first and twelfth molds. Then, by shifting the relative position of the mold part (runner #) that forms the runner that is the path for the liquid resin that connects to the sprue and the mold part that forms the molding recess when opening the mold for $2 parting. , cut the date part and separate the runner part from the molded product. Thereafter, the molded product is discharged from the four molding parts by opening the mold of the first parting.

As a result, it is possible to eliminate the need for separating the molded product in a subsequent process.

(Example) Hereinafter, an example of the injection molding mold apparatus according to the present invention will be described with reference to the drawings.

In Figures 1 to PltJ3, 1 is a mounting plate;
A support plate 2 is fixed to the mounting plate 1, and a back plate 3 and a cavity plate 4 are attached to the support plate 2 so as to be somewhat movable by means of a stop bin 10 fixed to the support plate 2. Here, the back plate 3 and the cavity plate 4 are integrated with bolts, and are urged rightward by a spring (compression spring) 17 provided around the stop bin 10. Further, a runner piece 9 is fixed to the support plate 2, and a sprue bush 20 is arranged and fixed inside the support plate 2. Sprue bush 20 contains liquid rjfl
A sprue 21 serving as a passage for the runner piece 9 is formed.
A runner 22 is formed in the sprue 21 and serves as a passage for liquid resin.

The back plate 3, cavity plate 4, runner piece 9, and sprue bush 20 constitute a first mold. One side portion 28A of a molding recess 28 is formed in the cavity plate 4, as shown in the enlarged sectional views of FIGS. 4 and 5.

A runner ejector turbine 16 that slidably passes through the runner piece 9 is fixed to the runner ejector plate 8, and a runner ejector guide 15 that slidably passes through the cavity plate 4 is fixed to the runner ejector plate 8. The runner ejector plate 8 is urged rightward by a spring (compression spring) 19.

On the other hand, the core plate 5, the plate 25, and the spacer block 26 are integrally fastened to the mounting plate 27 with bolts, etc.
The remaining one side portion 2 of the four molding parts 28 is attached to the core plate 5.
Core 8B formed as shown in Figures 4 and 5! $1J2
9 are integrated. The above core plate 5, core piece 2
9 and the plate 25 constitute a second mold. A date (film date) 35 connecting the molding recess 28 and the runner 22 is located at the edge of the runner piece 9 (the boundary between the runner piece 9 and the cavity plate 4).

The first ejector plate 6 includes a core plate 5 and a return bin 11, 1 which slidably passes through the plate 25.
2 is fixed thereto, and a sprue ejector turbine 13 whose core #29 and receiver slidably pass through the plate 25 is fixed thereon. Furthermore, this ejector plate 6 is urged leftward by a spring (compression spring) 18.

A return pin 30 which slidably passes through the core plate 5 and the plate 25 is fixed to the second ejector plate 7, and a return pin 30 which slidably passes through the plate 25 and the core piece 29 is fixed to the second ejector plate 7. A Nizhiev turbine 14 reaching 28 is fixed. A spring (compression spring) 31 is disposed around the return pin 30 between the receiving plate 25 and the ejector plate 7, and the ejector plate 7 is biased to the right.

Next, the operation of the above embodiment will be explained.

FIG. 1 shows the state in which the first and ptS2 molds are closed and the first ejector plate 6 is pushed down by pushing the return pin 11 with the stop bin 10 fixed to the support plate 2. in the reverse position;
The ejector plate 7 of the PIS 2 is in the retracted position by the force of the spring 31. Therefore, both the sprue ejector turbine 13 and the Nizhiev turbine 14 are in the retracted position. Further, since the mold is closed, the runner enoctor id 15 fixed to the runner ejector plate 8 is pushed by the core plate 5, and the runner ejector plate 8 is in the retracted position. Therefore, the runner ejector turbine 16 is also in the retracted position. In this state, liquid AT fat is poured into the four molding parts 28 shown in FIG. 4 through the sprue 21, the runner 22, and the thinned date (film date) 35, and is cooled and solidified to form the four molding parts. A molded product 40 (in this embodiment, it is disc-shaped) is created within the molded product 28 . FIG. 4 shows a case of insert molding in which an insert fitting 41 is placed in advance.

When the mold starts to open (when the left mounting plate 1 moves to the left), the force of the spring 17 first pushes the cavity plate 4 to prevent the first parting, which is the boundary between the first and second molds, from opening. At the same time, a force is applied to open the second part.

Also, the spring 18 causes the first ejector plate 6 to
By pushing , the return bins 11 and 12 and the sprue ejector turbine 13 also move forward at the same time. By pushing the stop bin lO with the return bin 11, a further force is applied to open the second parting.

When the second parting opens as shown in FIG. As shown in FIG. 5, the date portion 43 connecting the runner g42 and the molded product 40 is cut, and the runner portion 42 is separated from the molded product 40. In addition, the runner ejector guide 15 is installed in the return bin 12.
By pressing , the runner ejector turbine 16 is kept in the retracted position. The force of the spring 19 at this time is set to be weaker than the force of the spring 18.

Further, as the mold opening progresses, the collar of the stop bin 10 hits the cavity plate 4, the mold opening of the second parting is completed, and the forward movement of the first ejector plate 6 is also completed.

Next, when the first parting starts to open the mold, the runner ejector plate 8 is pushed forward by the spring 19, and the runner part 42 is cut back by the runner ejector turbine 16 as shown in Fig. 3 (for the next molding). Remove the runner part 42.). When the first parting stops opening the mold, in the case of a horizontal molding machine, the runner section 42 automatically falls due to its own weight. Then, during molding, the ejector rod 45 on the side pushes the ejector plate 7 of fjS2, the ejector bin 14 ejects the molded product 40, and the molded product 40 is taken out by a take-out rock or drop method.

In the case of the above example, the explanation was given in the case of a horizontal molding machine, but it can also be applied to the case of a vertical molding machine. Or you can take it out manually.

(Effects of the Invention) As explained above, according to the injection mold device of the present invention, by performing the operation of separating the molded product and the runner part at the date part when opening the mold, it is possible to By omitting the separation of molded products, it is possible to improve productivity, save labor, reduce costs, and further improve product quality.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of an injection mold device according to an embodiment of the present invention in a closed state, Fig. 2 is a front sectional view of a state in which the second parting is opened, and Fig. m3 is a sectional view of the mold in a closed state. @1 Parting is also a front cross-sectional view with the mold opened, Figure 4 is an enlarged cross-sectional view of the state where resin is put into the molding recess and injection molding is performed, and Figure 5 is a runner removed from the molded product at the date part. FIG. 1.27...Mounting plate, 2...Support plate, 3
... Back plate, 4... Cavity plate,
5...Core plate, 6.7...Ejector plate, 8...Runner ejector plate, 9...
・Runner, %, 10...stop bin, 11, 12
．． 30...Return bin, 13...Sprue eject turbine, 14...Nizhiev turbine, 15...
Runner ejector guide, 16... Runner ejector turbine, 17.18, 19, 31... Spring, 28... Recess for molding, 40... Molded product.

Claims (1)

[Claims] (1) A first and second mold forming a molding recess are provided, and in addition to a first part serving as a boundary between the first and second molds, a second part is provided in the first mold. The mold opening operation of the second parting cuts the gate part connecting the molded product and the runner part, and the mold opening operation of the first parting discharges the molded product from the molding recess. An injection mold device characterized by: