JPH077132Y2 - Injection mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an injection mold for molding a desired product using a thermoplastic resin, a thermosetting resin or the like.

(Prior Art) FIG. 11 shows a conventional mold of this type.

The fixed-side mounting plate 100, the runner stripper plate 101, the fixed-side mold plate 102, and the movable-side mold plate 103 are openable and closable along the horizontal direction in the drawing. And the fixed side mounting plate 100
The sprue 104 into which the molding material in a molten state is injected is provided in the container in parallel with the opening / closing direction. Further, the runner stripper plate 101 is provided with a main runner 105 communicating with the sprue 104 and orthogonal to the opening / closing direction. Further, the fixed side mold plate 102 includes the main runner 105 and the moving side mold plate.
An auxiliary runner 106 is provided which communicates with the cavity (not shown) of 103 and is parallel to the opening / closing direction.

With the injection molding die 107 configured as described above closed, the molding material is injected into the sprue 104 in a molten state by a nozzle (not shown). The injected molding material passes through the main runner 105 and the auxiliary runner 106, and the moving side template 103
While flowing into the cavity, the solidified and fixed, and the desired product is molded. Then, as shown in the figure, the mold is opened to cut a gate (not shown), the product 108 is projected from the cavity of the moving side mold plate 103, and the auxiliary runner 109a of the runner 109 as a molding material is formed in a direction orthogonal to the opening / closing direction. It is grasped by a take-out machine 110 which operates to a predetermined position and taken out from between the runner stripper plate 101 and the fixed-side mold plate 102.

(Problems to be solved by the invention) By the way, the position of the auxiliary runner 106 of the normal runner stripper plate 102 changes in the vertical direction in the figure depending on the position and number of cavities. Since the sub-runner 109a of the runner 109 is grasped by the unloader 110, it is necessary to manufacture various dedicated attachments so as to align the unloader 110 with the position of the sub-runner 109a, and to finely adjust the attachments, which increases the manufacturing cost. This has led to an increase in work man-hours. Also, since the runner 109 is not particularly provided with a detent, a conical sprue is obtained when the mold is opened.
The rotation around 109b caused the take-out machine 110 to idle, failing to take out the runner 109, and impeding complete automation of the molding process.

This invention is to solve the above-mentioned problems, and it is not necessary to make fine adjustments at the time of manufacturing and mounting various dedicated attachments, and it is possible to reliably grasp and take out the runner as a molding material by the unloader. It is intended to provide a mold for injection molding.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a fixed-side mounting plate, a runner stripper plate, and a fixed-side template that are arranged to be openable and closable along a predetermined direction. Is provided with a sprue parallel to the opening / closing direction, the runner stripper plate is provided with a main runner communicating with the sprue and orthogonal to the opening / closing direction, and the fixed-side template is provided with a main runner stripper plate main plate. In an injection molding die that connects the runner and the cavity of the moving-side mold plate and has a sub-runner that is parallel to the opening / closing direction, run the main runner of the runner stripper plate along the surface facing the fixed-side mounting plate. It was formed.

(Operation) According to the present invention based on the above configuration, when the molten molding material is injected from the sprue in the state where the fixed side mounting plate, the runner stripper plate, and the fixed side mold plate are closed, the molding material is the main runner stripper plate. It flows into the cavity of the moving-side template through the runner and the sub-runner of the fixed-side template, and is solidified and fixed in a predetermined shape. When the mold is opened and the product in the cavity is projected, the auxiliary runner of the solidified molding material is parallel to the opening / closing direction, and its rotation is restricted. Further, the main runner of the molding material is orthogonal to the opening / closing direction and is a runner stripper plate, which is present on the surface facing the fixed-side mounting plate. The sprue of the molding material exists in parallel with the opening / closing direction.

Therefore, the sprue can be taken out by the take-out machine, and the runner as the molding material can be taken out by operating the runner stripper plate and the fixed-side mold plate.

(Embodiment) Next, this invention will be described with reference to FIGS.

FIG. 1 shows the overall construction of an injection molding die 1 to which the present invention is applied. The injection molding die 1 includes a fixed side mounting plate 2, a runner stripper plate 3, a fixed side mold plate 4, and a movable plate. The side template 5 and the like are arranged so as to be openable and closable along a predetermined (horizontal) direction (left and right in the drawing as indicated by arrows). Fixed side mounting plate 2
A sprue 2a parallel to the opening / closing direction is formed at a predetermined position, that is, in the center.

Reference numeral 6 is a runner as a passage, and this runner 6 is a runner stripper plate 3 and a surface 3a facing the fixed side mounting plate 2.
The main runner 7 is formed along the main runner 7, and the sub runner 8 is provided parallel to the fixed-side template 4 in the opening / closing direction. That is, the main runner 7 is orthogonal to the opening / closing direction. In the mold closed state, the sprue 2a communicates with the center of the main runner 7, and the sub runner 8 communicates with the end of the main runner 7.

On the other hand, the moving side template 5 has a cavity 9 of a predetermined product shape.
Is provided. In the illustrated embodiment, only one cavity 9 is drawn for convenience, but in reality, a large number of cavities 9 are provided. And, it goes without saying that the positions and the number of the sub runners 8 are provided corresponding to the numbers and the positions of the cavities 9. In the mold closed state, the auxiliary runner 8
And the cavity 9 are communicated with each other by a gate (not specifically labeled).

By the way, the fixed side mounting plate 2 is provided with pusher pins 10 shown in FIGS. 7 and 8. The pusher pin 10 is inserted into an insertion hole 11 provided at a position corresponding to the main runner 7 along the opening / closing direction. The length of the pusher pin 10 in the opening / closing direction is the same as or slightly shorter than the length of the insertion hole 11 in the same direction. A locate ring 12 is provided on the end surface of the fixed side mounting plate 2 on the side opposite to the runner stripper plate 3, and a plate 13 is provided between the locate ring 12 and the fixed side mounting plate 2 with a screw member. It is fixed by 14. A spring 15 is mounted between the plate 13 and the pusher pin 10 to press the pusher pin 10 toward the runner stripper plate 3. Further, inside the insertion hole 11, a stopper 16 for restricting the operation amount of the pusher pin 10 is provided.

Further, the runner stripper plate 3 and the fixed-side mold plate 4 are connected by the configuration shown in FIGS. 5 and 6. The screw member 18 inserted into the insertion hole 17 of the runner stripper plate 3 is screwed and fixed to the screw portion on the fixed-side template 4 side. The head portion 18a of the screw member 18 and the step portion 1 in the insertion hole 17
Since there is a predetermined gap with 7a, the runner stripper plate 3 and the fixed side mold plate 4 can be opened by the gap as shown in FIG. 6, and the head portion 18a of the screw member 18 is stepped. 17a
To engage and stop.

Furthermore, the runner stripper plate 3 and the fixed-side template 4
The moving-side template 5 and the moving-side template 5 are connected by the configuration shown in FIGS. That is, the central axis of the shoulder bolt 19 coincides with the opening / closing direction, and the screw portion 19a is screwed into the runner stripper plate 3. Further, the fixed side mold plate 4 and the movable side mold plate 5 are provided with insertion holes 20 and 21 having a predetermined gap with respect to the shaft portion 19b of the shoulder bolt 19, and the insertion hole 21 has the shoulder bolt 19 Head 19c
Is provided with a step portion 21a. Therefore, the ninth
From the mold closed state as shown in the figure, the mold open state as shown in FIG. 10 and further the fixed side mold plate 4 can be opened leftward in the figure from the state shown in FIG.

In FIG. 1, reference numeral 22 denotes an ejector operated by a single-action take-out robot. The ejector 22 moves in and out between the fixed side mounting plate 2 and the runner stripper plate 3 in the mold open state, That is, it is configured so that a single action orthogonal to the opening / closing direction is possible.

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

First, when the injection molding die 1 is closed as shown in FIG. 2, a molten molding material (either a thermoplastic resin or a thermosetting resin) is injected through the sprue 2a. The molding material flows into the cavity 9 through the runner 6 as a passage, that is, the main runner 7 and the sub-runner 8, and is solidified and fixed to form a product 23 having a predetermined shape.

Then, as shown in FIG. 3, the fixed side mounting plate 2 and the runner stripper plate 3 are opened, and the sprue 32 as a molding material is exposed. At this time, as shown in FIG. 8, the pusher pin 10 pressed by the spring 15 is the runner of the solidified molding material.
30, more precisely the main runner 31 and the runner stripper plate 3
Press down on. Next, as shown in FIG. 4, the runner stripper plate 3 and the fixed-side mold plate 4 are opened, and the gate connecting the auxiliary runner 33 as a molding material and the product 23 is broken. Finally, the fixed side mold plate 4 and the movable side mold plate 5 are opened along the shoulder bolts 19 shown in FIG. 10 as shown in FIG. 1, and the product 23 is projected from the inside of the cavity 9 by the ejection pin (not shown). Will be done.

Further, the unloader 22 enters between the fixed side mounting plate 2 and the runner stripper plate 3 and grips the sprue 32. Then, by moving the runner stripper plate 3 and the fixed-side template 4 to the right in the figure, the main runner 7 is placed on the opposite surface.
Since it is provided along the line 3a, the runner 30, that is, the main runner 31 and the sub-runner 33 as the molding material comes out from the runner 6 as the passage, that is, the main runner 7 and the sub-runner 8, and is completely runner. Stripper plate 3 and stationary mold plate 4
Will be exposed to the outside. Therefore, if the unloader 22 is retracted upward in the figure, the removal of the runner 30 is completed.

As described above, in the present invention, the sprue 32 located at the center of the fixed side mounting plate 2 is grasped by the unloader 22 and the runner 30 is held.
Since the sprue 32 is taken out, the take-out machine 22
Even if the fixed-side template 4 in which the position of the auxiliary runner 33 changes in the direction orthogonal to the opening and closing due to the variation in the position and number of the cavities 9 of the moving-side template 5 is used. It is not necessary to manufacture various kinds of dedicated attachments for operating the unloader 22 according to the position of the sub-runner 33 or to finely adjust them, which can contribute to reduction of manufacturing cost and work man-hours.

In the mold open state as shown in FIG. 1, in the runner 30 as a molding material, the auxiliary runner 33 has the fixed-side mold plate 4
Since it exists in the sub-runner 8 of
The sprue 32 located at the center can be reliably grasped by the unloader 22 without idling, and the molding process can be fully automated.

In the illustrated embodiment, the whole is left and right in the figure, that is,
Although the injection molding die 1 which opens and closes in the horizontal direction is shown,
Of course, it may be applied to a mold that opens and closes in the vertical direction.

(Effect of the Invention) Since the present invention is configured as described above, after the completion of injection molding, the unloader that operates orthogonal to the opening and closing of the mold is installed between the fixed side mounting plate and the runner stripper plate. When the runner stripper plate and the fixed-side template are moved with the sprue held in place, the main runner is provided along the surface facing the fixed-side mounting plate. The runner as the material, that is, the main runner and the sub runner, comes out from the runner as the passage, that is, the main runner and the sub runner, and is completely exposed to the outside of the runner stripper plate and the fixed-side template. Therefore, if the unloader is left as it is, the removal of the runner is completed.

As described above, in the present invention, since the sprue at a predetermined position is grasped by the unloader and the runner is taken out, it is only necessary to operate the unloader in accordance with the sprue.
Even if a fixed-side template in which the position of the sub-runner changes in the direction orthogonal to the opening and closing due to fluctuations in the position and number of cavities in the moving-side template, various types of unloaders are operated according to the position of the sub-runner. There is no need to manufacture a dedicated attachment for or to finely adjust the attachment, which can contribute to reduction in manufacturing cost and man-hours.

Also, in the state where the mold is opened, the runner as a molding material does not rotate around the sprue because the sub-runner is located inside the sub-runner of the fixed-side mold plate, and the runner does not rotate at a predetermined position. Since the sprue in 1 is grasped by the unloader, there is no occurrence of idling, and various effects can be obtained such that the molding process can be completely automated.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 10 show an embodiment of the present invention, and FIGS. 1 to 4 are front views showing opening and closing operations of an injection molding die, and FIG.
6 and 6 are partial cross-sectional views showing the connecting mechanism between the runner stripper plate and the fixed side template, FIGS. 7 and 8 are partial cross-sectional views showing the operation of the pusher pin, and FIGS. 9 and 10 are shoulders. FIG. 11 is a partial cross-sectional view showing a bolt, and FIG. 11 is a front view showing the overall structure of a conventional injection molding die. Explanation of reference numerals 1 ... Injection mold, 2 ... Fixed side mounting plate 2a ... Sprue 3 ... Ranna stripper plate 3a ... Opposing surface, 4 ... Fixed side template 5 ... Moving side template, 6 ... Runner 7 ... Main runner, 8 ... Sub-runner 9 ... Cavity

Claims (1)

[Scope of utility model registration request] 1. A fixed-side mounting plate, a runner stripper plate, and a fixed-side template are arranged so as to be openable and closable along a predetermined direction,
A sprue parallel to the opening / closing direction is provided at a predetermined position on the fixed side mounting plate, a main runner communicating with the sprue and orthogonal to the opening / closing direction is provided on the runner stripper plate, and a runner is provided on the fixed side template. In an injection molding die that connects the main runner of the stripper plate and the cavity of the moving-side mold plate and has a sub-runner that is parallel to the opening / closing direction, the main runner of the runner stripper plate faces the fixed-side mounting plate. A mold for injection molding, which is formed along a surface.