KR20100033166A - A mold for holding an insert - Google Patents

Abstract

PURPOSE: An insert mounted mold is provided to improve the precision of injection molding by securing an insert in the accurate position when the mold or an injection molding machine shakes or vibrates. CONSTITUTION: An insert mounted mold comprises fixed and movable molds(10,20), an air control box(40), and a plurality of flexible pipes(41). The movable mold is carried back and forth with respect to the fixed mold. The air control box sucks or discharges air. The flexible pipes are attached to the air control box. First air suction/exhaust ports(21) are formed on the inner surface of the movable mold. A first path connected to the first air suction/exhaust ports is formed inside the movable mold. An opening(23) of the first path is formed on the side of the movable mold. A part of the flexible pipes is connected to the opening of the first path. An insert(50) is fixed by air suction.

Description

Insert mounting mold {A MOLD FOR HOLDING AN INSERT}

The present invention relates to a mold assembly for an injection molding apparatus for fixing an insert by air suction, and more particularly, to injection molding an internal / external case of an electronic product such as a mobile terminal, a portable terminal such as a PDA, a desktop computer, a notebook computer, or the like. The present invention relates to a mold assembly designed to stably fix and maintain an insert such as a manufacturer's logo using an air suction means (air control box).

In general, various characters or symbols are attached to the internal and external cases of a desktop computer or a laptop computer, such as a logo of a computer manufacturer, a character representing a computer specification, and a logo of a microprocessor manufacturer embedded in a computer. Such characters or symbols are inserted into a mold during injection molding of an internal / external case such as a desktop computer or a notebook computer, and are generally referred to as inserts.

Conventionally, in order to arrange such an insert in position in a metal mold | die, the method of hole-positioning or digging into a metal mold | die and using the method of placing an insert in a hole-processing part or a digging process part was used.

However, according to this conventional method, there is a problem in that the position of the insert is changed by vibration of the injection molding apparatus or shaking of the mold while the mold is moving, so that the precision is lowered or the defective rate is increased.

In addition, in order to place the insert in place in the mold, since the mold requires a separate machining process such as hole processing or digging, there is a side problem that the working time is long and the product cost increases.

An object of the present invention is to solve this problem, and to provide a new mold assembly capable of stably fixing and maintaining the insert without the need for a separate machining process during injection molding.

In order to achieve the above object, in the present invention, in the injection molding or double injection molding in which the insert is inserted, the insert is fixed in place in the mold by vacuum suction (strictly, suction by negative pressure). · It has a structure to keep it.

According to one embodiment of the invention, there is provided a mold assembly for an injection molding apparatus for fixing an insert by air suction, comprising: a fixed mold having an injection liquid injection hole, the injection liquid injection hole being provided with an injection liquid injection gate; A moving mold moving back and forth with respect to the fixed mold; An air control box for sucking and discharging air; And a plurality of flexible conduits attached to the air control box. A plurality of first air intake / exhaust ports are formed on an inner surface of the moving mold, and a first passage communicating with the plurality of first air intake / exhaust ports is formed inside the moving mold, An opening of the first passage is formed in the side portion of the first passage. A portion of the plurality of flexible conduits is connected to the opening of the first passageway.

On the other hand, it is preferable that the recessed part (insert insertion hole) of the shape corresponding to the insert in which the insert is seated is formed in the inner surface of the said moving mold.

Further, a robot arm for insert gripping is further provided between the fixed mold and the moving mold, and a plurality of second air intake / exhaust ports are formed on an inner surface of the insert gripping robot arm, and the insert gripping robot is provided. A second passage communicating with the plurality of second air intake / exhaust ports is formed inside the arm, and an opening of the second passage is formed in the side portion of the insert gripping robot arm, and the plurality of flexible More preferably, the remaining portion of the conduit is connected to the opening of the second passageway.

According to another embodiment of the present invention, there is provided a mold assembly for a double injection molding apparatus for fixing an insert by air suction, in which injection liquid inlets are formed, and the injection liquid inlets are respectively provided with injection liquid injection gates. A first stationary mold and a second stationary mold; A first moving mold and a second moving mold moving back and forth with respect to the first fixed mold and the second fixed mold; An air control box for sucking and discharging air; And a plurality of flexible conduits attached to the air control box. A plurality of first air suction / exhaust ports are formed on inner surfaces of the first moving mold and the second moving mold, respectively, and the plurality of first air suction / exhaust ports are formed inside the first moving mold and the second moving mold. And a first passage communicating with the second passage is formed, and openings of the first passage are formed in side portions of the first moving mold and the second moving mold. A portion of the plurality of flexible conduits is connected to the opening of the first passageway.

On the other hand, it is preferable that recesses of a shape corresponding to the insert on which the insert is seated are formed on the inner surface of the first moving mold.

Further, a robot arm for insert gripping is further provided between the first fixing mold and the first moving mold, and a plurality of second air intake / exhaust ports are formed on an inner surface of the insert gripping robot arm. A second passage communicating with the plurality of second air intake / exhaust ports is formed in the insert gripping robot arm, and an opening of the second passage is formed in the side portion of the insert gripping robot arm. More preferably, the remaining portion of the plurality of flexible conduits is connected to the opening of the second passageway.

According to the above configuration, even if the mold shakes or the injection molding apparatus vibrates during the injection molding, the insert can be stably fixed and held in place in the mold. It can improve the precision and drastically reduce the defective rate of the product.

Further, in order to place the insert in place in the mold, the mold does not require a separate machining process such as hole machining or digging, which is advantageous in terms of manufacturing time and manufacturing cost as compared with the conventional method.

In addition, when separating the finished injection molded product from the mold, it is possible to safely separate the finished injection molded product without fear of damage by using the air power output through a plurality of air inlet / outlet.

Hereinafter, with reference to the accompanying drawings will be described a mold assembly of the present invention.

As shown in FIG. 1, the mold assembly of the first embodiment of the present invention includes a stationary mold 10, a moving mold 20, an air control box 40, and a plurality of flexible conduits 41. It is included. An injection liquid injection hole (not shown) is formed in the stationary mold 10, and an injection liquid injection gate (not shown) is provided in the injection liquid injection hole. A plurality of first air intake / exhaust ports 21 are formed on the inner surface of the moving mold 20, and three of the plurality of first air inside the moving mold 20. A first passage 22 (in the drawing, two first passages are shown by dotted lines) is formed in communication with the suction / exhaust port 21, and the first passage is formed on the side surface of the moving mold 20. Openings 23 (two on the top side and two on the bottom side are shown on the drawing) are formed. The moving mold 20 moves back and forth (in the direction of arrow A or vice versa) with respect to the stationary mold 10 to open or close the mold assembly.

The air control box 40 is provided with an air intake / discharge valve (not shown). In addition, a plurality of flexible conduits 41 are attached to the air control box 40, and some of the plurality of flexible conduits 41 are connected to the opening 23 of the first passage 22. have. The air control box 40 may suck air or discharge air as needed. That is, when the insert 50 is fixed in the moving mold 20, air is sucked through the flexible conduit 41 connected to the air control box 40 to generate negative pressure at the first air inlet / outlet 21. The insert 50 is sucked and fixed in position in the moving mold 10 in the direction of arrow B, and the finished injection molded product or semi-finished product (the injection molded product formed only by the first resin in the double injection molding machine) is moved from the moving mold 20. When separating, by discharging air and generating a positive pressure in the first air intake / exhaust port 21, the injection molded product or semifinished product completed by the air-discharge output is safely separated without fear of damage.

In addition, it is preferable that recesses having a shape corresponding to the insert are formed on the inner surface of the moving mold 20 to stably position the insert.

On the other hand, in the field of making the injection molding by inserting the insert needs to automate the process of inserting the insert 50 into the moving mold 20 and fixedly, such as indicated by the member number "30" in FIG. Insert holding mechanism or robot arm 30 may be used. The insert holding robot arm 30 picks up the insert 50 and automatically places the insert 50 into the moving mold 20 of the mold assembly. The robot arm 30 is fixed to the moving mold 20 in an open state of the mold assembly. After entering the mold 10 and placing the insert 50 in the moving mold 20, the device moves to the outside of the mold assembly before the mold assembly is closed.

2 shows a configuration in which the robot arm 30 for insert gripping is provided between the stationary mold 10 and the moving mold 20. On the inner surface of the insert gripping robot arm 30, a plurality of second air suction / exhaust ports 21 'are formed on the inner surface of the insert gripping robot arm 30, and the inside of the robot gripping arm 30 for insert gripping is formed. The second passage 22 '(in the drawing, two second passages are shown by dotted lines) is formed in communication with the plurality of second air intake / exhaust ports 21'. Opening 23 'of the second passage 22' (two on the top side and two on the bottom side of the insert gripping robot arm 30 are shown on the side of the robot arm 30). Is formed. The remaining portion of the plurality of flexible conduits 41 (except that connected to the opening 23 of the first passage 22 of the plurality of flexible conduits 41) is the second passage 22 ′. Is connected to the opening 23 '.

Specifically, referring to FIG. 2, first, the air is sucked through the flexible conduit 41 connected to the air control box 40 to generate negative pressure in the plurality of second air intake / exhaust ports 21 ′. In the state where 50 is attracted and fixed to the insert holding robot arm 30 in the direction of arrow C, it moves to the moving mold 20, and then the insert 50 is passed to the moving mold 20. As shown in FIG. In this case, that is, when the insert 50 is passed to the moving mold 20, negative pressure is generated in the plurality of first air intake / exhaust ports 21 formed in the moving mold 20, and the robot arm for insert gripping ( The plurality of second air intake / exhaust ports 21 ′ formed at 30 may block the flow of air so that the insert 50 may naturally move into the moving mold 20 in the direction of the arrow B.

The mold assembly of the second embodiment of the present invention is used in a double injection molding apparatus, and is based on the same construction and the same technical concept as the first embodiment described above. The second embodiment of the present invention will be described below.

First, a double injection molding apparatus is a device which generally injection molding using two materials (or two colors) in a single part, that is, a first mold assembly composed of two sets of molds (that is, a first fixed mold and a first moving mold). And a second mold assembly composed of a second stationary mold and a second moving mold), first molded into the first mold assembly, and then the cavity of the second mold assembly to be secondary molded of the primary molded article. An apparatus for filling and injecting secondary resin into the space between the primary molded article and the primary molded article.

The mold assembly of the second embodiment of the present invention corresponds to the fixed mold 10 of the first embodiment, and has a pair of fixed molds, that is, a first fixed mold and a second fixed mold, and the movement of the first embodiment. It is different from the first embodiment in that it has a pair of moving molds, that is, a first moving mold and a second moving mold, corresponding to the mold 20.

Specifically, a plurality of first air suction / exhaust ports are formed on inner surfaces of the first moving mold and the second moving mold, respectively, and the plurality of first moving molds are formed inside the first moving mold and the second moving mold. A first passage communicating with the air intake / exhaust port is formed, and opening portions of the first passage are formed in side portions of the first moving mold and the second moving mold. A portion of the plurality of flexible conduits is connected to the opening of the first passageway.

In addition, in the second embodiment, in order to insert the insert 50 into the mold and hold the insert 50, the robot arm for insert gripping may be further provided between the first fixing mold and the first moving mold. A plurality of second air intake / outlets are formed on an inner surface of the insert gripping robot arm, and a second passage communicating with the plurality of second air intake / outlets is formed in the insert gripping robot arm. The opening of the second passage may be formed in a side portion of the insert gripping robot arm, and a portion of the plurality of flexible conduits may be connected to the opening of the second passage.

The specific embodiments of the present invention described above are merely exemplary, and the technical scope of the present invention is not limited to the specific embodiments described above. Those skilled in the art to which the present invention pertains may variously modify or change the present invention without departing from the spirit and technical scope of the present invention described in the claims below.

For example, the positions of the stationary mold and the moving mold may be arranged opposite to those shown in the drawings, and the number and arrangement of the first air inlet / outlet and the second air inlet / outlet, the first passage and the second passage, respectively. The number and configuration of the flexible conduits and the number and configuration of the flexible conduits are not limited to those shown in the drawings or described above, but may be appropriately modified and used as necessary.

1 is a perspective view showing an example of a mold assembly according to the present invention.

2 is a perspective view showing another example of a mold assembly according to the present invention further including an insert gripping robot arm.

Claims (6)

A mold assembly for an injection molding apparatus, An injection liquid injection hole is formed, and the injection liquid injection hole is provided with a fixed mold having an injection liquid injection gate; A moving mold moving back and forth with respect to the fixed mold; An air control box for sucking and discharging air; And A plurality of flexible conduits attached to the air control box; It contains, A plurality of first air intake / exhaust ports are formed on an inner surface of the moving mold, and a first passage communicating with the plurality of first air intake / exhaust ports is formed inside the moving mold, The opening of the first passage is formed in the side portion of the And wherein some of said plurality of flexible conduits are connected to openings in said first passageway. 2. The mold assembly of claim 1, wherein a recess is formed on an inner surface of the moving mold to correspond to the insert on which the insert is to be seated. The robot arm for insert gripping according to claim 1 or 2 is further provided between the fixed mold and the moving mold. A plurality of second air intake / outlets are formed on an inner surface of the insert gripping robot arm, and a second passage communicating with the plurality of second air intake / outlets is formed in the insert gripping robot arm. The opening of the second passage is formed in the side portion of the robot arm for insert gripping, And a remaining portion of said plurality of flexible conduits is connected to an opening in said second passageway. A mold assembly for a double injection molding apparatus, Injection liquid injection ports are formed, respectively, the injection liquid injection ports having a first fixed mold and a second fixed mold each having an injection liquid injection gate; A first moving mold and a second moving mold moving back and forth with respect to the first fixed mold and the second fixed mold; An air control box for sucking and discharging air; And A plurality of flexible conduits attached to the air control box; It contains, A plurality of first air suction / exhaust ports are formed on inner surfaces of the first moving mold and the second moving mold, respectively, and the plurality of first air suction / exhaust ports are formed inside the first moving mold and the second moving mold. A first passage communicating with the second passage is formed, and openings of the first passage are formed at side portions of the first movement mold and the second movement mold, And wherein some of said plurality of flexible conduits are connected to openings in said first passageway. 5. The mold assembly of claim 4, wherein a recess is formed on an inner surface of the first moving mold to correspond to the insert on which the insert is to be seated. The robot arm for insert gripping is further provided between the said 1st fixed metal mold | die and the said 1st moving metal mold | die, A plurality of second air intake / outlets are formed on an inner surface of the insert gripping robot arm, and a second passage communicating with the plurality of second air intake / outlets is formed in the insert gripping robot arm. The opening of the second passage is formed in the side portion of the robot arm for insert gripping, And a remaining portion of said plurality of flexible conduits is connected to an opening in said second passageway.

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