JPH0118344Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a mold for injection molding a synthetic resin molded product having an undercut portion on the outside.

(Problems of the prior art to be solved by the invention) Conventionally, in this type of mold, an angular pin is attached to the fixed side (or movable side) template via a cavity plate, and ) The cavity plate attached to the mold plate is equipped with a slide core that opens and closes in the right angle direction when the mold is opened and closed by the angular pin, so it was necessary to replace the entire mold every time the molded product was changed. .

(Purpose of the invention) The present invention was devised to solve the above-mentioned conventional problems. Only the smallest part of the mold that requires replacement is nested, and an angular pin is installed in the fixed platen side insert holder. A guide hole is provided in the slide piece attached to the movable platen side insert holder, and the slide piece slides in a direction perpendicular to the mold opening/closing direction in conjunction with the mold opening/closing operation by the angular pin fitted into the guide hole. By arranging the slide piece so that it can be connected to the slide core configured inside the insert, it is possible to easily exchange molds using the insert method, and also to create a split mold with a slide core. The purpose is to be able to select and use a simple mold without a slide core.

(Structure of the invention) The injection mold of the invention is equipped with insert holders that can attach inserts by slidingly engaging both sides of the fixed platen and the movable platen, and An angular pin is provided in the insert holder on the movable platen side, and a guide hole is provided in the slide piece attached to the insert holder on the movable side platen side. It is characterized in that it is configured to slide in a direction perpendicular to the mold opening/closing direction, and that the slide piece is provided so as to be connectable with a slide core configured in the nest.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a cavity plate, which is fitted and fixed into a holding plate 2 having a U-shaped cross section and a runner (not shown) so as to be retracted from the surface of the holding plate 2, and is inserted through the holding plate 2 into a mold having the same shape and size. It is attached to the mounting plate 3. Engagement ridges 4, 4 that are continuous in the vertical direction are provided on both left and right sides of the mold mounting plate 3, and insertion guide surfaces 5, 5 are formed at the lower ends of the engagement ridges 4, 4. has been done. Guide pins 6, which perpendicularly penetrate through the presser plate 2 and protrude from its surface (parting surface), are crimped or press-fitted into the mold mounting plate 3. A locking block surface 7 is formed on the inner peripheral edge of the presser plate 2. The fixed side insert P is thus configured.

8 is a fixed side insert holder, and fixed side platen 9
are mounted parallel to each other on the left and right surfaces of the Engagement grooves 10, 10 that are continuous in the vertical direction and open on opposite sides are formed in opposing parts of the nest holders 8, 8, and engagement grooves 10, 10 are formed in the lower ends of the nest holders 8, 8. 10, a stopper 11 facing inside 10 is provided.

Reference numeral 12 denotes an angular pin, which is attached to the stationary insert holder 8 by attaching the pin mounting plate 13 to the lower end of the stationary insert holder 8 with bolts 14.

15 is a rectangular cavity plate, and bolts 17 are attached to a mold mounting plate 16 of the same shape and size.
It is installed by. On both left and right sides of this mold mounting plate 16, engaging protrusions 1 that are continuous in the vertical direction are provided.
8, 18 are provided, and insertion guide surfaces 19, 19 are formed at the lower ends of the engagement protrusions 18, 18. The mold mounting plate 16 and the cavity plate 15 have mounting pins 2 that are slidably guided by these.
0, 20 and the protruding pin 21 are integrally mounted via the protruding plate 22, and the guide hole 23, which fits with the guide pin 6, and the pin through hole 24, which has a larger diameter than the guide hole 23,... It is formed. Further, on the surface of the cavity plate 15, a dovetail-shaped core mounting portion 25 is formed which is continuous from the cavity side end to the opposite end of the cavity and is open to the surface side. A slide core 26 is movably fitted inside. The slide core 26 has a parting surface that projects from the surface of the cavity plate 15, and a receiving surface 27 that comes into contact with the locking block surface 7 is formed at the rear of this part. The movable insert Q is thus configured.

Reference numeral 28 denotes a movable insert holder, which is mounted parallel to the left and right surfaces of the movable platen 29 so as to face each other. Engagement grooves 30, 30 are formed in opposing parts of the insert holders 28, 28, and are continuous in the vertical direction and open on opposite sides. A stopper 31 facing into the grooves 30, 30 is provided. A dovetail-shaped piece mounting portion 32, parallel to the core movement direction, is formed on the side surface of the nest holder 28.
Slide pieces 33, . . . are movably fitted into the piece mounting portions 32, . A guide hole 34 for the angular pin 12 is formed in the slide piece 33, and a tongue-shaped core connecting portion 35 is formed on the slide core 26 side of the slide piece 33.
The slide cores 26,... are the slide pieces 33,
... are connected by bolts 36, ....

The fixed-side and movable-side inserts P, Q have engaging protrusions 4, 4, 18, 1 provided on their mold mounting plates 3, 16.
8 is the fixed side, movable side insert holder 8, 8, 28,
28, and is slidably engaged with the engagement grooves 10, 10, 30, 30 provided in the insert holders 8, 8,
It is supported by stoppers 11 and 31 provided at 28 and 28, and is attached to fixed side and movable side platens 9 and 29.

In this embodiment, the slide piece 33 is moved by the angular pin 12, but it goes without saying that the same effect can be obtained by replacing the slide piece 33 with an angular cam, cylinder, or the like.

(Function) When the movable platen 29 is guided by the tie bar 37 attached thereto and moved forward relative to the fixed platen 9 by the mold clamping device, the angular pins 12, ... first move into the guide holes provided in the slide pieces 33, ... 34,... and connected to the slide pieces 33,... slide (close) in a direction perpendicular to the mold closing direction in conjunction with the mold closing.

During mold closing operation, the movable cavity plate 15 and slide core 2 are attached to the fixed cavity plate 1.
Almost at the same time as 6,... come into contact, presser plate 2
The locking block surface 7 provided on the slide cores 26, . . . comes into contact with the receiving surfaces 27 provided on the slide cores 26, . In this state, the opposing surfaces of the fixed cavity plate 1, the movable cavity plate 15, and the slide cores 26, . . . are brought into close contact, and molding cavities 38, . After the mold clamping is completed, resin is injected into the cavities 38, . . . via sprues and runners provided on the stationary platen 9 and the presser plate 2, and the product is molded.

After the injection is completed, the entire movable side 15 to 36 is opened, the locking of the slide cores 26, . . . is released, and the slide cores 26, . . . are slid (opened) by the angular pins 12, .
At the same time, the product is removed from the fixed cavity plate 1 and moved to the movable cavity plate 15 by the protruding pin 21 which is protruded through the protruding plate 22 by an actuating device (not shown) during the mold opening operation.
It comes off and is ejected.

By repeating the above operations, products having undercut portions are repeatedly produced.

When changing the shape of a product having an undercut, the corresponding cavity plates 1, 15, slide core 26, etc.
16 into a fixed side insert P and a movable side insert Q, and then connect the slide core 26 to the slide piece 33. In addition, when molding a product that does not have an undercut part, it is sufficient to use fixed side and movable side inserts of a simple mold without a slide core, and at this time, the angular pin 12 and slide piece 33 are However, there is no problem in molding the product.

In this embodiment, the slide core 26 and its slide mechanism are provided on the movable side insert Q, and the slide piece 33 connectable to the slide core 26 and its slide mechanism are provided on the movable side, and the angular pin 12 is provided on the fixed side. However, it may be reversed.

(Effects of the invention) As described above, the present invention is a telescoping mold in which the fixed side platen and the movable side platen are each provided with an insert holder, and the angular pins, slide pieces, etc. provided on each insert holder are shared. However, since the structure allows only the insert to be replaced and used, both split molds with a slide core and simple molds without a slide core can be used by replacing only the insert. The production is easy as only the nesting is required.
Can be done quickly and cheaply. Furthermore, the molded product space width can be increased by arranging the insert holder between tie bars arranged side by side in the insert inserting direction. Therefore, by effectively utilizing the advantages of the telescoping mold as described above, it is possible to sufficiently cope with the increasingly complex shapes of products and the production of a wide variety of products in small quantities.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the present invention.
2 is a sectional view taken along the line A-A of FIG. 1 shown in the mold closed state, and FIG. 3 is the 1st cross sectional view shown in the mold opened state.
It is a sectional view taken along the line AA in the figure. 1, 15... Cavity plate, 2... Holding plate, 3, 16... Mold mounting plate, 7... Locking block surface, 8, 28... Inset holder, 9...
Fixed side platen, 11... Stopper, 12...
Anguilla pin, 25... Core attachment part, 26...
Slide core, 27...receiving surface, 29...movable platen, 31...stopper, 32...piece mounting portion, 33...slide piece, 34...guide hole.

Claims (1)

[Scope of utility model registration request] The fixed platen and the movable platen are each equipped with a nest holder that allows inserts to be attached by slidingly engaging both sides, and an angular pin is provided on the fixed platen's nest holder, and the movable platen's insert is attached to the fixed platen. A guide hole is provided in the slide piece attached to the child holder, and the slide piece is configured to slide in a direction perpendicular to the mold opening/closing direction in conjunction with the mold opening/closing operation by the angular pin fitted into the guide hole. An injection mold, characterized in that the slide piece is provided with a slide core configured within the insert so as to be connectable thereto.