JPH06254911A - Injection molding die - Google Patents

Abstract

PURPOSE:To deal with a plurality of insert blocks easily by using only one injection molding die for plastic injection molding. CONSTITUTION:One side face of a fixed side template 30 is opened and a fixed side insert block is set to be drawn out freely in the horizontal direction. A runner 14 and a secondary sprue 15 are provided on the side opposite to a product of the fixed side insert block. A key channel 34 is formed on the inner side face of the fixed side template 30, and a key projecting section 35 is formed on the outer side face of the fixed side insert block, and the fixed side block is slid by engaging the key channel 34 with the key projecting section 35 and removed or replaced freely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die for plastic injection molding, and more particularly, to a die which can easily accommodate a plurality of inserts with one die.

[0002]

Prior Art and Problems to be Solved by the Invention FIG.
FIG. 10 is a partial sectional side view showing an example of a conventional three-plate mold having a runner stripper plate. 1 in the figure
Is a fixed side mounting plate, 2 is a runner stripper plate, 3
Is a fixed-side template, 4 is a movable-side template, 5 is a backup plate, 6 is a spacer block, 7 is an ejector plate, 8 is an ejector plate, and 9 is a movable-side mounting plate. Further, in the figure, 11 is a fixed side insert, 12 is a movable side insert, 13 is a primary sprue formed in the sprue bush,
Reference numeral 14 is a runner, 15 is a fixed-side template 3 and fixed-side insert 11
A secondary sprue formed inside the secondary sprue 15
Communicates with a cavity 16 formed between the fixed-side insert 11 and the movable-side insert 12. 9 shows the mold clamped state and FIG. 10 shows the mold opened state. In FIG. 10, 17 is a runner take-out space and 18 is a product take-out space.

In a three-plate mold having such a conventional runner stripper plate, when it is attempted to accommodate a plurality of inserts (product parts) without changing the main part of one mold, the fixed side Since the insert 11 and the same number of runner stopper plates are required in accordance with the insert 11, there is a problem in that the number of processes and the storage space increase. In addition, if the runner stripper plate is used in common, the degree of freedom in design is remarkably narrowed, and there are many restrictions on the mold that can be actually used, and there is a problem that it is difficult. Of course, the same problem occurs with the fixed side mounting plate.

FIG. 15 is a partial cross-sectional side view showing an example of a conventional three-plate mold having ejector pins for ejecting a product. This mold is structurally almost the same as the mold of FIGS. 9 and 10, and the ejector pin 19 has a collar 2 at the end.
0, and the collar 20 is sandwiched and held between the upper ejector plate 7 and the lower ejector plate 8.

In this type of mold, when one mold (mold base) is used to accommodate a plurality of inserts (product parts), the collar 20 of the ejector pin 19 is present, so that the mold is movable. It is necessary to disassemble and reassemble the mold in accordance with the replacement of the side insert 12, or to have a complicated structure in which two or more plates are combined. There was also a problem in terms of cost.

The present invention has been made in view of the above points, and an injection molding die capable of reducing the cost by remaking only the insert portion with one die body (mold base). The purpose is to provide.

[0007]

In order to achieve the above object, an injection molding die according to the present invention is an injection molding die in which an insert having a cavity is removably attached to a recess for a nest setting of a mold body. In the mold, the fixed side mold plate concave portion for setting the fixed side insert is penetrated in the mold removing direction, and one side surface is opened so that the fixed side insert can be inserted and removed in the direction along the side surface and the secondary sprue. And the runner portion is provided on the opposite side of the fixed-side insert from the product side, and the concave-convex engaging portion is provided on the outer side surface of the fixed-side insert and the inner side surface holding the fixed-side insert of the fixed-side mold plate recess to make it removable Moreover, an opening is provided in the fixed side mounting plate, and a holding plate having a hole for fixing the runner lock pin is detachably held.

In order to achieve the above-mentioned object, an injection molding die according to the present invention is an injection molding die in which an insert having a cavity is removably attached to a recess for a nest setting of a mold body. A straight cylinder without a flange for the projecting pin, which penetrates the concave part of the movable side mold plate in which the child is set, and opens one side to allow the movable side insert to be inserted and removed in the direction along the side surface. The shape is such that it can be inserted into and removed from the ejector plate side through a pin hole provided in the movable side insert, and the end portion of the protruding pin is fixed to the upper surface of the ejector plate.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that, in the following, the same parts as those of the prior art will be denoted by the same reference numerals, and overlapping description will be omitted.

1 to 7 show a first embodiment of an injection molding die according to the present invention. This embodiment is a runner stripper plateless mold, and there is no runner stripper plate, and the structures of the fixed-side mold plate 30, the fixed-side insert 31, and the fixed-side mounting plate 32 are as shown in FIGS. 9 and 10. Is different from the one.

The fixed-side mold plate 30 has a concave portion 33 for setting the fixed-side insert 31 penetrating in the die-cutting direction, and one side surface is opened to fix the fixed-side insert 31 to the fixed-side insert 31. It can be inserted and removed in the horizontal direction. On the other hand, the fixed-side insert 31 has the runners 14 and 2 on the upper surface in the figure, that is, the surface opposite to the product side.
The next sprue 15 is provided and has the same thickness as the fixed-side template 30 so that the sprue 15 fits tightly into the recess 33 of the fixed-side template 30. And fixed side template 30
Key grooves 34, 3
4 is provided, and key protrusions 35, 35 (only one of which is shown in the figure) are provided on the outer side surface of the stationary insert 31.
Therefore, in order to mount the fixed side insert 31 in the concave portion 33 of the fixed side mold plate 30, the key projection 35 is engaged with the key groove 34 at the open portion of the concave portion 33 and is slid. All you have to do is slide it out of the opening and pull it out.
The fixed side insert 31 can be easily replaced. The key groove 34 and the key protrusion 35 prevent the nest from falling off in the mold open state (FIG. 2), and of course, other means such as a dovetail groove may be adopted. The fixed-side insert 31 is fixed to the fixed-side mold plate 30 with a bolt or the like (not shown).

As shown in FIGS. 3 and 4, the fixed side mounting plate 32 has a holding plate 36 for holding the runner lock pin.
An opening 37 is provided for mounting. The holding plate 36 is shown in FIG.
As shown in FIG. 6, the two side edges have a stepped shape, and the inner surface of the opening 37 has a stepped shape corresponding to the holding plate 36 so that the holding plate 36 can be detachably held. . As shown in FIG. 7, the holding plate 36 is provided with a hole 39 into which the runner lock pin 38 is inserted.
A plurality of holding plates 36 are prepared so as to cope with the position change of the runner lock pin 38 due to the replacement of the fixed-side insert 31, so that the gate can be surely cut off and a problem at the time of mold release is prevented.

In this embodiment, as shown in FIG. 2, the runner is pulled out from the runner take-out space 17 between the fixed side mounting plate 32 and the fixed side mold plate 30, and the product is movable with the fixed side mold plate 30 as in the conventional case. Between the side template 4 Product take-out space 18
Remove from the. Further, in the mold of this embodiment, when a plurality of inserts are to be accommodated by one mold (mold base), only the fixed insert 32 can be freely moved from the fixed mold plate 30 when the mold is opened. Take out and install other fixed side inserts, and if necessary, hold plate 36 on fixed side mounting plate 3
The position of the runner lock pin 38 can be changed by removing and replacing the upper surface side of 2.

FIG. 8 shows a second injection mold according to the present invention.
An example is shown. In this embodiment, the shapes and structures of the movable side mold plate 40, the movable side insert 41 and the ejector pin 42 are different from those of the conventional one shown in FIG.

The movable-side mold plate 40 has a recess 43 for setting the movable-side insert 41 which penetrates in the die-cutting direction, and one side surface of which is opened to allow the movable-side insert 41 to move in the horizontal direction in FIG. It can be inserted and removed freely. On the other hand, the movable side insert 41
Is the same thickness as the movable side mold plate 40.
It fits snugly into the recess 43.
Further, step portions 44, 44 are provided on the two inner side surfaces of the concave portion 43 of the movable side mold plate 40 facing each other, and the movable side insert 4
Steps 45, 45 on the outer surface of 1 (only one is shown in the figure)
Is provided. Therefore, the movable side insert 41 is attached to the movable side mold plate 4
In order to mount it in the recess 43 of 0, the step 4 is opened at the open portion of the recess 43.
4, the step portion 45 is engaged, and the slide portion is slid.
Further, it is only necessary to slide and pull out from the open portion to remove, and the movable side insert 31 can be easily replaced. The movable-side insert 41 is fixed to the movable-side mold plate 40 with a bolt or the like (not shown).

The ejector pin 42 has a straight columnar shape, and does not have a collar at its lower end. Therefore, in the mold open state, the product can be inserted into the movable side insert 41 and the backup plate 5 from the product take-out space 18.
The lower end of the ejector pin 42 is fixed to the upper surface of the ejector plate 7 with an instant adhesive, a magnet, or the like, so that the ejector pin 42 can be interlocked with the ejector plate 7.

[0017]

As described above, the injection molding die according to the first aspect of the present invention has the runner portion and the secondary sprue portion on the fixed side insert, and is removable from the side surface of the die.
If one die (mold base) is designed to handle multiple inserts, only the fixed-side inserts need to be reassembled. Runner stopper plate recombinations and mold release processes that were required in conventional dies, etc. There is an effect that it is possible to make a die cheaply in terms of manufacturing cost. Moreover, since the thickness of the entire mold is reduced by not using the runner stopper plate, it is possible to make the fixed-side mold plate or the movable-side mold plate thicker. There is an effect that it can be applied to molded products of. Furthermore, in the injection molding process, the runner material is reduced and the waste of material is minimized, and since the mold opening amount is small, the molding cycle is shortened and puller bolts etc. are not necessary in the mold structure. Therefore, there is an effect that the process is simplified and the assembling property and the degree of freedom in design are improved.

As described above, in the injection molding die according to the second aspect of the present invention, since the movable-side insert is removable from the side surface of the mold, the movable-side insert can be removed even after the movable-side insert is once fixed. Therefore, there is an effect that the step of reassembling the mold (mold base), which is conventionally required when reassembling the insert portion, is unnecessary. In addition, since the ejector pin has a straight cylindrical shape without a collar, it can be inserted into the movable side insert from the product take-out space formed between the fixed side mold plate and the movable side mold plate when the mold is opened, and the lower end of the ejector plate By simply fixing it to the upper surface with an instant adhesive, a magnet, or the like, it becomes possible to interlock with the ejector plate, and there is an effect that the exchange workability in the injection molding process can be improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a first embodiment of an injection molding die according to the present invention.

FIG. 2 is a partial cross-sectional side view showing a mold open state of the mold of FIG.

FIG. 3 is a partial plan view of a fixed-side mounting plate of the mold of FIG.

FIG. 4 is a partial side sectional view of a fixed side mounting plate of the mold of FIG.

5 is a side view showing a holding plate of a runner lock pin attached to the fixed side attachment plate of FIGS. 3 and 4. FIG.

FIG. 6 is a plan view showing a holding plate of a runner lock pin attached to the fixed side attachment plate of FIGS. 3 and 4;

FIG. 7 is a partial cross-sectional view showing how the runner lock pin is attached to the holding plate of FIGS. 5 and 6;

FIG. 8 is a partial cross-sectional side view showing a second embodiment of an injection molding die according to the present invention.

FIG. 9 is a partial cross-sectional side view showing an example of a conventional injection molding die.

FIG. 10 is a partial cross-sectional side view showing the mold open state of the mold of FIG.

FIG. 11 is a partial sectional side view showing another example of a conventional injection molding die.

[Explanation of symbols]

 1 Fixed-side mounting plate 2 Ranna stripper plate 3 Fixed-side mold plate 4 Movable-side mold plate 5 Backup plate 6 Spacer block 7 Ejector plate upper 8 Ejector plate lower 9 Movable-side mounting plate 11 Fixed-side insert 12 Movable-side insert 13 1 Next sprue 14 Runner 15 Secondary sprue 16 Cavity 17 Runner take-out space 18 Product take-out space 19 Ejector pin 20 Collar 30 Fixed-side template 31 Fixed-side insert 32 Fixed-side mounting plate 33 Recess 34 Key groove 35 Key protrusion 36 Holding plate 37 Opening 38 Runner Lock Pin 39 Hole 40 Movable Side Template 41 Movable Side Nest 42 Ejector Pin 43 Recess 44, 45 Step

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideki Shoji 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (2)

[Claims] 1. An injection molding die in which an insert having a cavity is detachably attached to an insert setting recess of a mold body, and a fixed mold plate recess in which a fixed insert is set is penetrated in a mold removing direction. And, one side surface is opened to allow the fixed side inserter to be inserted and removed in the direction along the side surface, and the secondary sprue and runner are provided on the product side of the fixed side inserter, and the outer side surface of the fixed side inserter. Also, a concave-convex engaging portion is provided on the inner surface that holds the fixed-side insert of the fixed-side mold plate recess to make it removable, and an opening is provided in the fixed-side mounting plate and a hole for fixing the runner lock pin is provided. A mold for injection molding, characterized in that the plate is detachably held. 2. In an injection molding die in which an insert having a cavity is detachably attached to an insert setting recess of a mold body, a movable mold plate recess for setting a movable insert is penetrated in a mold removing direction. In addition, one side surface is opened to allow the movable side insert to be inserted and removed in the direction along the side surface, and the protruding pin has a straight cylindrical shape without a collar from the pin hole provided in the movable side insert to the ejector plate side. Can be freely inserted and removed,
Also, an injection molding die characterized in that the end of the protruding pin is fixed to the upper surface of the ejector plate.