JPH0615682A - Injection molding method and apparatus - Google Patents

Abstract

PURPOSE:To efficiently perform assembling work without using an exclusive automatic assembling machine by positioning a preliminarily produced movable member between molds when the movable member is fitted in an injection-molded product in a relatively movable manner and again clamping the molds by the utilization of the ejection operation of the injection-molded product or before the ejection of the injection-molded product to fit the movable member in the injection-molded product. CONSTITUTION:It is pref. that a robot device 24 is used to mount a preliminarily produced movable member 26 on the movable member holding part 24a of the robot device 24. A resin passage 10a and a robot supporting hole 10b are formed to a fixed mold 10 and, after an injection-molded product 28 is molded, molds are opened and the foot part 24b of the robot device 24 is inserted in the robot support hole 10b of the fixed mold 10. Next, the injection-molded product 28 is thrust out by an ejector pin 22 to be inserted in the movable member 26. Or, a slide mold forming a cavity along with a movable mold 14 is provided and the movable member 26 is mounted on the movable member holding part continuing to the cavity part. After injection molding, the slide mold is slid by opening the molds and the molds are clamped to fit the movable member 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method and apparatus. A combination product in which a separately manufactured movable member is embedded in an injection-molded product so that it can move relative to one another is used, for example, in automobile sun visor holding parts, household towel racks, light-load bearing parts, etc. , Is configured to be rotatable or axially movable with respect to the injection molded product. The injection molding method and apparatus of the present invention are intended for such a combination product.

[0002]

2. Description of the Related Art As a conventional method for fitting a movable member to an injection-molded product, a separately manufactured, for example, metal-made movable member is manually or automatically assembled in a post process with respect to a pre-molded injection-molded product. It was common to assemble it by fitting it with a machine.

[0003]

However, the conventional method for assembling the movable member with respect to the above-mentioned injection-molded product requires manpower for manual work or a dedicated automatic assembling machine. Therefore, there was a problem that the cost was high. Therefore, it is possible to insert the movable member into the mold and assemble it to the molded product at the same time as the injection molding. However, although there is an advantage that the time required for the assembly can be saved, the structure of the mold is complicated. In addition, since the molded product tends to be in a state in which the movable member is fastened at room temperature due to the shrinkage of the molding material, this adjustment requires a lot of work, which causes a problem that the manufacturing cost of the mold becomes extremely expensive. In addition, it is inevitable that such a mold has a divided structure, and there is another problem that the appearance of the product is impaired because a joint is formed in the injection molded product. The present invention aims to solve such problems.

[0004]

SUMMARY OF THE INVENTION The present invention utilizes the ejecting operation of ejecting an injection-molded product from a mold that has been opened, or opening / closing the mold before the injection-molded product is ejected. The above problem is solved by utilizing the movable member carried in between the molds and fitting it into an injection molded product to make a product, and ejecting the product from the mold. That is, in the injection molding method according to claim 1 of the present invention, a molten resin is injected into a mold cavity that has been clamped to mold an injection molded product having a movable member fitting portion, and then the mold is opened. The pre-manufactured movable member is loaded into the movable member fitting position between the molds, and then the injection molded product is ejected to fit the movable member into the injection molded product so that the movable member is relatively movable, and then the product is molded. Take out from. The injection molding method according to claim 2 is a pre-manufactured product that is pre-manufactured by injecting a molten resin into a mold cavity that has been clamped to mold an injection-molded product having a movable member fitting portion, and then opening the mold. The movable member is moved to the movable member fitting position between the molds, and then the mold is closed to fit the movable member into the injection-molded product so that the movable member can move relatively, and then the product is opened again, and then the product is opened. Stick out from the mold. A device according to claim 3 is a fixed type (1
0), a movable die (14) capable of moving between the die open position and the die closed position in opposition thereto, and an ejecting device (20, 22) arranged on the movable die (14) side and capable of ejecting. And has a closed mold (10) and a movable mold (1
A cavity (C) is formed by 4), and a molten resin is injected into the cavity to form an injection molded product (28) having a movable member fitting portion (28a). (10, 14) A robot device (24) that can move between a standby position outside and a movable member fitting position in both molds opened (10, 14) is provided. The ejecting device (20) is capable of receiving and holding the manufactured movable member (26) at the standby position, and with the movable member (26) held by the robot device (24) positioned at the movable member fitting position. , 22), the relative size and the relative position of the injection molded product (28) are set so that the injection molded product (28) can be fitted into the movable member (26) by the ejecting operation. . Further, in the apparatus according to claim 4, a slide mold (12) is provided between a fixed mold (10) and a movable mold (14), and the mold is closed.
2) The cavity (C) is formed by the mold part (12a) and the movable mold (14), and the slide mold (12) is continuous with the mold part (12a) and A movable member holding portion (12b) capable of holding a movable member (26) manufactured in advance is provided,
The slide mold (12) has a molding position where the mold part (12a) faces the movable mold (14) and a movable member fitting position where the movable member holding part (12b) faces the movable mold (14). The slide mold (12) is slidably supported by the fixed mold (10). The slide mold (12) is positioned at the molding position, and the mold is closed and clamped. The movable member (26) is transferred to and held by the movable member holding portion (12b) of the slide mold (12) during the pressure holding process, and after the cooling / mold opening process, the slide mold (12) is positioned at the movable member fitting position. The movable type (14)
However, the movable member (2) in which the mold-closed injection-molded product (28) adhered to the mold is held in the movable member holding portion (12b)
6) When it is fitted into the movable mold (1) and the mold is opened again, the ejecting device (20, 22) performs the ejecting operation.
It is set so as to project the injection-molded product (28) and the movable member (26) connected thereto from 4). In addition,
Reference numerals in parentheses indicate corresponding members of the embodiment.

[0005]

[Action]

(Operation of claim 1) After the injection molding, the movable member is carried in and positioned between the opened molds, and the injection molded product is ejected from the mold during the operation of ejecting the injection molded product. Is attached to the movable member, and the ejected product is taken out from the mold in the combined state. (Operation of Claim 2) After the injection molding, the movable member is carried between the opened molds, and the mold is closed again to fit the movable member into the injection-molded product, and after the mold is opened again, the eject operation is performed. Eject the products that have gone into the combined state from the mold. In any case, while the injection-molded product is inside the injection-molding machine, the take-out process is used to fit the movable member into the injection-molding machine. Assembling work can be performed inexpensively and efficiently without the need.

[0006]

1 and 2 show a first embodiment of the present invention. The fixed die 10 is fixed to a fixed platen (not shown). The fixed mold 10 is formed with a resin passage 10a and four robot support holes 10b (only two robot support holes 10b are shown in the drawing). Stoppers 11 are attached to the bottoms of the robot support holes 10b, respectively. A movable die 14 is arranged so as to face the fixed die 10. The movable die 14 includes a movable plate 18 via an annular member 16.
It is fixed to. In the mold clamping state shown in FIG. 1, two cavities C are formed by the fixed mold 10 and the movable mold 14. Molten resin can be injected into the cavity C from an injection device (not shown) through the resin passage 10a of the fixed mold 10. A robot device 24 is arranged above both molds 10 and 14 in FIG. The robot device 24 has a movable member holding portion 24a, a foot portion 24b, an arm member 24c, and a driving portion (not shown). Movable member holder 24a
Has two mounting holes for mounting the movable member 26. The drive unit is connected to the arm member 24c. The movable member 26 is made of metal and is separately manufactured in advance. The robot device 24 can each hold the movable member 26 by the movable member holding portion 24a, and the movable member holding portion 24a is in a movable member mounting position (not shown), a standby position shown in FIG. 1, and shown in FIG. Sequentially move to the fitting position and the product unloading position (not shown)
It can be stopped. In the mold open state shown in FIG. 2, the fixed mold 10 has the robot device 2 in the robot support hole 10b thereof.
It is possible to support the movable member holding portion 24a of the robot device 24 at the fitting position facing the movable mold 14 by fitting the four foot portions 24b of the four. An ejector plate 20 is arranged in the annular member 16 described above. A large number of eject pins 22 are integrally attached to the ejector plate 20. In the mold open state, the ejector plate 20 can be driven by an eject cylinder (not shown) to cause the eject pin 22 to eject from the retracted position shown in FIG. 1 to the eject position shown in FIG.

Next, the operation of the first embodiment will be described.
First, the mold is closed from the mold open state, and the mold clamping state shown in FIG. 1 is obtained. In this state, the molten resin from the injection device (not shown) passes through the resin passage 10a of the fixed mold 10 and the cavities C
And injection molded articles 28 each having a movable member fitting portion 28a are molded. During each of the injection / pressure-holding and cooling processes, the robot device 24 moves to the movable member holding portion 24a at a movable member mounting position (not shown).
After the two movable members 26 are mounted by hand or the like, the movable members 26 are moved to a standby position shown in the figure and are in standby at this position. Next, in the mold opening process, the robot device 24 is
The movable member holding portion 24a is positioned at the fitting position shown in FIG. 2 by moving the foot portion 24b to the robot supporting hole 10b of the fixed die 10 and abutting the stopper 11 by moving the foot portion 24b between the four. Next, the ejector plate 20
The eject pin 22 integrated with the eject pin 22 starts to move from the retracted position shown in FIG. 1 to the eject position shown in FIG. 2 by being driven by an eject cylinder (not shown). As a result, the injection-molded product 28 is ejected from the movable mold 14 and fitted into the movable member 26,
It is considered a product. Next, the eject pin 22 is retracted from the eject position shown in FIG. 2 to the retracted position in the movable die 14, and the movable member holding portion 24 of the robot device 24 is also retracted.
a is moved to the left in FIG.
4b is pulled out from the robot support hole 10b of the fixed die 10. As a result, the robot device 24 can freely move while holding the product, and moves to a product unloading position (not shown), where the product is taken out from the robot device 24. Subsequently, the robot device 24 moves to a movable member mounting position (not shown), and one cycle ends.

Next, FIGS. 3 and 4 show a second embodiment of the present invention. In the second embodiment, only the components different from those in the first embodiment will be described. No cavity is formed in the fixed die 10, and the slide die 12 is supported by the fixed die 10 so as to be movable in the vertical direction in FIG.
As shown in the figure, the slide die 12 is provided with a die portion 12a, a movable member holding portion 12b, and a resin passage 12c. The slide die 12 can be moved between a molding position shown in FIG. 3 and a movable member fitting position shown in FIG. 4 by being driven by a moving device (not shown). As shown in FIG. 3, when the slide mold 12 is positioned at the molding position and is clamped,
A cavity C is formed by the mold part 12 a of the slide mold 12 and the movable mold 14. Molten resin can be injected from the injection device (not shown) into the cavity C through the resin passage 10a of the fixed die 10 and the resin passage 12c of the slide die 12. The slide die 12 can hold the two movable members 26 by the movable member holding portions 12b, but when the movable member 26 assembled as a product as described later is pulled to the movable die 14 side. Are in a mating relationship so that they can be easily removed from the movable member holding portion 12b.

Next, the operation of the second embodiment will be described.
First, the mold is closed from the mold open state, and the mold clamping state shown in FIG. 3 is obtained. The molten resin is fixed to the fixed mold 10 from an injection device (not shown).
Resin passage 10a and the slide type 12 resin passage 12c
And is injected into both cavities C through the above, and injection molded products 28 each having a movable member fitting portion 28a are molded. During the injection / pressure-holding and cooling processes, the movable member 26 is attached to the movable member holding portion 12b of the slide mold 12 by hand or the like. Next, in the mold opening step, the slide mold 12 is driven by a moving device (not shown) to move from the molding position shown in FIG.
The movable member shown in is slid to the inset position. In this state, the mold is closed again. As a result, the movable member 26 is fitted into the injection-molded product 28 attached to the movable mold 14 to obtain a product. Next, the mold is opened again, and the movable member 26 side of the product is removed from the slide mold 12. As a result, the product is stuck to the movable mold 14. Subsequently, the slide die 12 is slid to the molding position, and the product ejecting step is performed. That is, the ejector plate 2
0 and the eject pin 22 integrated therewith are driven to an eject cylinder (not shown) to move to the eject position on the right side of the position shown in FIG. 4, whereby the product is ejected from the movable mold 14. It The product falls into a product pool (not shown) in the lower part of FIG. This completes one cycle.

Although two cavities C are formed in the description of each of the above-described embodiments, the number of cavities C may be other than this. Further, the product has a shape in which the movable member 26 is fitted in the center hole of the injection molded product 28, but any product may be used as long as the movable member 26 is fitted in the injection molded product 28 so that the movable member 26 can move relative to each other. However, the shape is not limited to the above.

[0011]

As described above, according to the present invention, the movable member can be fitted into the injection-molded product by assembling it by utilizing the ejecting operation or the mold opening / closing operation. The automatic assembling machine and the like are not required, and the product including the injection molded product and the movable member can be efficiently and inexpensively assembled.

[Brief description of drawings]

FIG. 1 is a diagram showing an injection molding apparatus according to a first embodiment of the present invention.

FIG. 2 is a view showing a state where an injection molded product is fitted in a movable member.

FIG. 3 is a diagram showing an injection molding apparatus according to a second embodiment of the present invention.

FIG. 4 is a view showing a state in which an injection molded product and a movable member face each other.

[Explanation of symbols]

 10 Fixed Type 12 Slide Type 12a Mold Section 12b Movable Member Holding Section 14 Movable Type 18 Movable Plate 20 Ejector Plate (Extrusion Device) 22 Eject Pin (Extrusion Device) 24 Robot Device 24a Movable Member Holding Section 26 Movable Member 28 Injection Molded Product

Claims (4)

[Claims] 1. An injection-molded article having a movable member fitting portion is formed by injecting a molten resin into a cavity of a mold that has been clamped, and then the mold is opened to move the movable member manufactured in advance between the molds. The injection molding method in which the movable member is carried in to the insertion position, and then the injection molded product is ejected so that the movable member is relatively movably fitted into the injection molded product to obtain a product, and then the product is taken out of the mold. 2. An injection-molded article having a movable member fitting portion is molded by injecting a molten resin into a mold cavity that has been clamped, and then the mold is opened to move the previously manufactured movable member between the molds. The movable member is loaded into the fitting position, and then the mold is closed to fit the movable member into the injection-molded product so that the product can move relative to it, then the product is opened again, and then the product is ejected from the mold. Method. 3. A fixed mold (10) fixed to a fixed part,
It has a movable die (14) capable of moving between the die open position and the die closed position facing this, and an ejecting device (20, 22) arranged on the movable die (14) side and capable of ejecting. The cavity (C) is formed by the fixed mold (10) and the movable mold (14) which are closed, and the movable member fitting portion (28a) is formed by injecting the molten resin into the cavity (C).
In an injection molding apparatus for molding an injection molded product (28) having a mold, it is possible to move between a standby position outside both molds (10, 14) and a movable member fitting position inside both molds (10, 14) opened. A robot device (24) is provided, and the robot device (24) has a movable member (26) manufactured in advance.
Can be received and held at the standby position, and the ejecting device (20, 22) performs the ejecting operation while the movable member (26) held by the robot device (24) is positioned at the movable member inset position. The injection molding apparatus in which the relative dimension and the relative position of the injection molded product (28) are set so that the injection molded product (28) is fitted into the movable member (26). 4. A fixed mold (10) fixed to a fixed part,
A slide mold (12), a movable mold (14) facing the slide mold (12) and movable between a mold open position and a mold closed position, and a movable mold (1
4) A protrusion device (2) arranged on the side and capable of protrusion operation
0, 22), and a cavity (C) is formed by the mold part (12a) of the closed slide mold (12) and the movable mold (14). In an injection molding device for molding an injection molded product (28) having a movable member fitting portion (28a) by injection, the slide mold (12) is manufactured continuously with the mold part (12a). A movable member holding portion (12b) capable of holding the movable member (26) is provided, and the slide mold (12) has a molding position where the mold portion (12a) faces the movable mold (14), Movable type (14)
The fixed member (1) is slidable between the movable member holding portion (12b) and the movable member fitting position facing the movable member holding portion (12b).
0), and the operation sequence of these members is such that the slide mold (12) is positioned at the molding position, closed and clamped, and then the slide mold (12) moves during the injection and pressure holding process. The movable member (26) is transferred to and held by the movable member holding portion (12b), and after the cooling / mold opening process, the slide mold (12) is positioned at the movable member fitting position.
4), the injection-molded product (2
8) is fitted into the movable member (26) held by the movable member holding portion (12b), and when the mold is opened again, the ejecting device (20, 22) performs an ejecting operation and ejects from the movable mold (14). An injection molding device configured to project a molded product (28) and a movable member (26) connected thereto.