JPH1110650A - Mold and method for changing telescopic form fitted to mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a telescopic form without removing a mold from a molding machine body. SOLUTION: A mold 11 fitted with a telescopic form 15 is provided with a pin fitting hole 22 extending in the fitting direction of the telescopic form 15, a jig inserting hole 24 opening to the side of the mold 11 to intersect with the pin fitting hole 22, and an extruding pin 16 capable of moving in the pin fitting hole 22. One end of the extruding pin 16 is projected into the jig inserting hole 24, and the other end is butted to the telescopic form 15. By pushing an extruding pin driving jig 25 having a wedge-shaped tip 25a into the jig inserting hole 24, the extruding pin 16 is driven for extruding the telescopic form 15 from the mold 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold in which a nesting die facing a molding surface is exchangeably mounted and a method of exchanging a nesting die attached to the die. Technology that is effective in improving workability.

[0002]

2. Description of the Related Art Conventionally, as a mold of this kind, for example,
The one shown in FIG. 6 is known. FIG. 6 is a longitudinal sectional view showing a basic structure of an injection molding die for molding a lid of a battery case used for an automobile or the like. In FIG. 6, reference numeral 1 denotes a fixed type, and 2 denotes a movable type. is there.

The fixed die 1 is bolted to a fixed mounting plate 3 fixed to an injection molding machine main body (not shown), and its vertical movement is restricted. The movable mold 2 is bolted to the spacer block 4 and moves vertically in the vertical direction through the spacer block 4 by moving the movable side mounting plate 5 in the vertical direction by the operation of the driving means (not shown). It is possible.

Further, a core 6 for molding the inner peripheral surface of the molded product is bolted to the movable mold 2 in a state where the core 6 is fitted. Then, a molten resin is injected into a cavity portion 7 formed between the core 6 and the fixed mold 1 to form a molded product.

On the other hand, the fixed mold 1 includes a nesting die 8 having a transfer surface 8A for transferring irregularities according to the displayed contents to the molded product in order to display the product type and the like on the surface of the molded product.
It is exchangeably mounted by bolting.

In the injection molding die having such a configuration, when characters, patterns, and the like displayed on the surface of a molded product differ from product to product, the display content is changed by appropriately replacing only the nesting mold 8. It is designed to be transferred to a molded product.

[0007]

By the way, the nesting die 8 attached to the injection molding die having the above-mentioned construction is constructed by inserting a bolt into the nesting die 8 from the side of the transfer surface 8A to fix the dies.
If the screw 9 is screwed into the transfer surface 8A, a bolt hole is opened in the transfer surface 8A. Therefore, as shown in FIG. It is fixed by screwing into.

However, in the injection molding die having such a configuration, it is necessary to remove the fixed die 1 from the fixed side mounting plate 3 when replacing the nesting die 8, and the operation of replacing the nesting die 8 is extremely complicated. Had the disadvantage that

The present invention has been made in view of the above circumstances, and provides a mold capable of exchanging a nested mold without removing the mold from a molding machine body and a method of exchanging a nested mold attached to the mold. The purpose is to:

[0010]

The present invention has the following features to attain the object mentioned above. The mold according to claim 1, wherein a nested mold facing a molding surface is exchangeably attached to one of a fixed mold and a movable mold, and the mold to which the nested mold is attached is provided. A pin mounting hole extending from the mounting surface in the mounting direction of the nesting mold, and a jig insertion hole that intersects the pin mounting hole and opens on a side surface of the mold are provided, and in the pin mounting hole, An extruding pin, one end of which is protruded into the jig insertion hole and the other end of which is brought into contact with the nest, is provided movably along the mounting direction. Things.

The method for replacing a nested mold attached to a mold according to claim 3 is a method for replacing a nested mold attached to a mold according to claim 1, wherein the jig insertion hole has a wedge shape. By pushing in an extruding pin driving jig having a tip end, the one end protruding into the jig insertion hole is pushed into the pin mounting hole to drive the extruding pin, and the driven extruding pin moves to move the other. The nest is extruded from the mold at an end.

According to such a configuration, by inserting and pushing in a push pin driving jig having a wedge-shaped tip into the jig insertion hole, one end of the push pin protruding into the jig insertion hole is connected to the jig tip. The nesting die is pushed out of the mold by the action of being pushed into the pin mounting hole along the inclined surface of the part and the other end of the push pin protruding from the mounting surface.

According to a second aspect of the present invention, in the mold of the first aspect, the nesting mold includes a fixing pin extending in the mounting direction and having a groove formed in a circumferential direction. A pin hole into which the fixing pin is inserted, and a locking member that engages with the groove of the fixing pin inserted into the pin hole and restricts movement of the fixing pin in the mounting direction. It is characterized by being provided so as to be able to be evacuated.

According to such a configuration, when the push-in force is applied to the push-out pin, the locking member is retracted from the groove of the fixing pin while the holding ability of the nesting mold in the mold is enhanced. Thus, the restraining force for restraining the fixing pin can be reduced. In addition, urethane rubber, a ball plunger, or the like is used as the locking member, for example.

[0015] When the push pin is driven by pushing a jig for driving the push pin into the jig insertion hole,
By the guide of the fixing pin, the push-out pin is moved in the direction coinciding with the mounting direction of the nest, so that the nest can be prevented from tilting in the fixed mold.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Note that the injection mold of the present embodiment is different from the injection mold shown in FIG. 6 only in the configuration of the nesting mold and its peripheral part, and therefore, the description of the entire configuration is omitted, and The characteristic parts will be described.

FIG. 1 is a cross-sectional view of a main part showing a main part of an injection molding die of the present embodiment, and FIG. 2 is an enlarged cross-sectional view in which a part of FIG. 1 is further enlarged. In these figures, reference numeral 11 denotes a fixed type, 12 denotes a movable type, 13 denotes a fixed-side mounting plate, 14 denotes a core, and 15 denotes a nested type.

Reference numeral 16 denotes an extruding pin for extruding the nesting mold 15 from the fixed mold 11. The extruding pin 16 has one end 16A formed in a substantially conical shape and the other end 16B formed in a flat end. On the other end 16B side, there is provided a stopper portion 16b formed to have a larger diameter than the push pin main body 16a.

Nesting type 15 attached to fixed type 11
A transfer surface 15A for transferring unevenness according to the display content to the surface of the molded article is formed on one surface of the fixed mold 11.
A fitting hole 17 is formed in the rear surface 15B to be fitted with the other end 16B of the push-out pin 16 at a predetermined distance L from the central part, and is equally spaced from the central part. The fixing pins 18, 18 are provided upright.

Grooves 19 are formed in the fixing pins 18 and 18 in the circumferential direction, and the movement of the nesting mold 15 in the mounting direction is restrained by locking members 20 and 20 that engage with the grooves 19. Thereby, the holding property of the nesting mold 15 in the fixed mold 11 is enhanced, and the nesting mold 15 adheres to the molded article due to the shrinkage of the molded article, and the nesting mold 15 is prevented from coming off the fixed mold 11 at the time of release. can do.

As the locking members 20, 20, for example, those formed of an elastic member such as urethane rubber are employed.
When a certain load or more is applied to the fixing pins 18 in the nested pushing direction (downward direction in FIG. 2),
The portion engaged with the groove 19 is elastically deformed to release the locked state. These locking members 20, 20
Mounting surface 11A on fixed side mounting plate 13 in fixed mold 11
Are fixed in the locking member mounting holes 21 and 21 provided in the mounting member.

On the other hand, the fixed mold 11 constituting the female mold (cavity) is engraved with a concave portion 11a according to the shape of the molded product, and further has a nested mounting hole in the bottom surface 11B of the concave portion 11a. 11b is formed.

In this embodiment, the nested mounting hole 1
1b, that is, a pin mounting hole 22 and pin holes 23, 23 extending from the mounting surface 11c where the nesting die 15 is mounted to the fixed die 11 in the mounting direction of the nesting die 15.
Are formed so as to pass through the fixed die 11 and stop in the fixed-side mounting plate 13, and the fixed-side mounting plate 13 intersects the pin mounting holes 22 and the pin holes 23, 23, and is fixed. A jig insertion hole 24 that opens on the side surface of the side mounting plate 13 is provided.

The pin mounting hole 22 is for accommodating the pushing pin 16 in the fixed die 11 so as to be movable in the mounting direction of the nesting die 15. The enlarged diameter portion 22a that accommodates the stopper portion 16b of the pushing pin 16 and regulates the movement range of the stopper portion 16b is provided from a substantially central portion in the thickness direction of the fixed die 11 to the mounting surface 11A. .

The pin holes 23 are for accommodating the fixing pins 18 in the fixed mold 11 when the nesting mold 15 is attached to the fixed mold 11. The jig insertion hole 24 is for inserting an extrusion pin driving jig 25 (see FIG. 3) having a wedge-shaped tip portion 25a to drive the extrusion pin 16.

The relationship between the jig insertion hole 24, the push pin 16 and the fixing pins 18, 18 is such that one end 16 A of the push pin 16 protrudes from the pin attachment hole 22 into the jig insertion hole 24. In addition, as for the fixing pins 18, 18, the ends thereof correspond to the jig insertion holes 2.
The dimensions are set appropriately so as not to protrude into the inside.

Next, the operation when removing the nesting mold 15 from the injection mold thus configured will be described with reference to FIG.
This will be described with reference to FIG. FIG. 3 shows a state in which the push-pin driving jig 25 is inserted into the jig insertion hole 24, and the tip 25 a of the jig is brought into contact with one end 16 A of the push pin 16.

From this state, the pushing pin driving jig 25
Is pushed into the push-out pin 16 with a constant pushing force using a hitting means such as a hammer, for example, so that the locking members 20 and 20 are elastically deformed and the locking members 2 are deformed.
The fixing pins 18, 18 locked at 0, 20 can be moved, and the pushing pins 1 protruding into the jig insertion hole 24.
6 is pushed into the pin mounting hole 22 along the inclined surface of the jig tip 25a.

As a result, the other end 1 of the push pin 16
As shown in FIG. 4, 6B is projected so as to be separated from the mounting surface 11c of the nested mounting hole 11b, and the nested die 15 is removed from the fixed die 11 so as to be pushed out from the nested mounting hole 11b. .

At this time, the push-out pin 16 is moved in the direction corresponding to the mounting direction of the nesting die 15 by the guide of the fixing pins 18, 18, so that the nesting mounting hole 1 is formed.
It is possible to prevent the nesting mold 15 from being inclined and not coming off within 1b.

As described above, according to the present embodiment, the nesting die 15 can be formed only by pushing the pushing pin driving jig 25 into the jig insertion hole 24 without removing the fixed die 11 from the fixed mounting plate 13. Since the nest 15 can be removed from the fixed mold 11, the work of replacing the nest mold 15 can be easily performed.

In this embodiment, the locking members 20 and
Although a description has been given of a case in which the entire member is formed of an elastic member as 20, the plunger 32 is fixed to the axial center of the fixing pins 18 by an elastic member 31 such as a spring, as in a ball plunger 30 shown in FIG. May be configured to be urged toward and engaged with the groove 19.

Further, in the present embodiment, the mounting strength of the nesting mold 15 is reduced by the fixing pins 19, 19 provided with the grooves 19.
And the locking members 20 and 20 that engage with the groove 19, but may be secured by the fitting force between the nesting die 15 and the nesting mounting hole 11b. Therefore, the mounting structure of the nesting mold 15 can be made simpler.

Further, in the present embodiment, the mold for injection molding has been described, but the present invention can be applied to any other mold, for example, a mold for press molding.

[0035]

As is clear from the above description, according to the present invention, the following effects can be obtained. (A) According to the method for exchanging the mold set according to claim 1 and the nested mold attached to the mold set forth in claim 3, even if the fixed mold is not removed from the fixed side mounting plate, the push pin is inserted into the jig insertion hole. Since the nest type can be removed from the fixed type only by pushing the driving jig, the workability at the time of the nest type replacement can be improved.

(B) According to the second aspect of the present invention, it is possible to improve the workability at the time of exchanging the nesting mold and to enhance the holding ability of the nesting mold mounted in the mold.

(C) When driving the push-out pin by inserting the jig for driving the push-out pin into the jig insertion hole, moving the push-out pin in a direction coinciding with the mounting direction of the nest type by guiding the fixing pin. Therefore, the inclination of the nest in the fixed mold can be avoided, and the detachability of the nest during replacement can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a mold according to the present invention.

FIG. 2 is an enlarged sectional view in which a part of FIG. 1 is enlarged.

FIG. 3 is a cross-sectional view showing a state in which a pushing pin driving jig is inserted into a jig insertion hole in a nesting type exchanging step, and a tip end thereof is brought into contact with one end of the pushing pin.

FIG. 4 is a cross-sectional view showing a state in which a jig for driving an extrusion pin is pushed in to drive the extrusion pin, following the state of FIG.

FIG. 5 is a cross-sectional view showing another embodiment of the locking member according to the present invention.

FIG. 6 is a longitudinal sectional view showing an example of a basic structure of a conventional mold (for injection molding).

FIG. 7 is a cross-sectional view illustrating a main part of the mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Fixed type 11c Mounting surface 12 Movable type 15 Nesting type 16 Extruding pin 16A One end 16B Other end 18 Fixed pin 19 Groove 20, 30 Locking member 22 Pin mounting hole 24 Jig insertion hole 25 Pushing pin driving jig 25a Tip

Claims (3)

[Claims] 1. A mold in which a nested mold facing a molding surface is exchangeably attached to one of a fixed mold and a movable mold, and the mold to which the nested mold is attached is attached to the mold. A pin mounting hole extending from the surface in the mounting direction of the nesting mold, and a jig insertion hole that intersects the pin mounting hole and opens on a side surface of the mold are provided. A die, characterized in that a push pin that is protruded into a jig insertion hole and whose other end is brought into contact with the nesting die is provided movably along the mounting direction. 2. The mold according to claim 1, wherein the nesting mold is provided with a fixing pin extending in the mounting direction and having a groove formed in a circumferential direction, and the fixing pin is provided in the mold. A pin hole to be inserted, and a locking member that engages with a groove of the fixing pin inserted into the pin hole and restricts movement of the fixing pin in the mounting direction is provided so as to be retractable from the groove. A mold. 3. The method for exchanging a nested die attached to a mold according to claim 1, wherein an extruding pin driving jig having a wedge-shaped tip is pushed into the jig insertion hole, so that the inside of the jig insertion hole is reduced. Wherein the one end protruding into the pin mounting hole is pushed into the pin mounting hole to drive the push pin, and the driven push pin is moved to push out the nesting mold from the mold at the other end. How to replace a nested mold attached to a mold.