JP2001009876A - Mold assembly for injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and accurately separate a molded product from a runner by forming a hole for forming a projection to be erected from the runner in a fixed side template. SOLUTION: A rubber groove 7 for allowing resin to flow into a cavity and a male die part 8 of a cavity are formed to a movable side template 3. Further, a hole to be connected to the rubber groove 7 is formed near a female die part of a fixed side template, and a projection 20 is allowed to be formed to the rubber 13 in molding. Then, a through hole 19 through which a sprue 18 passes and a throughhole 21 through which the projection 20 is inserted are formed to a plate 17 of a robot hand 15 for holding a molded product 12, the runner 13 or the like and conveying them to a separator. Shrinkage and deformation of the runner 13 are prevented by inserting the projection 20 into the throughhole 21. Thereafter, the molded product 12 and the runner 13 are ejected by an ejector mehcanism 9, separated from a male die part 8 and the runner groove 7, and the molded product 12 is separated from the runner 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus for injection molding comprising a fixed mold plate and a movable mold plate, and more particularly to a molded product molded by a mold and a molded product thereof. The present invention relates to a mold apparatus for forming a molded product suitable for cutting a runner that is connected and molded together with a mold.

[0002]

2. Description of the Related Art A conventional apparatus will be described with reference to FIGS. Reference numeral 101 denotes a mold device for injection molding. The mold device 101 includes a fixed mold plate 102 and a movable mold plate 103. The fixed mold plate 102 has a sprue hole 105 through which resin flows into a cavity 104 for molding a molded product, and a female mold portion 106 of the cavity 104.
Are formed. On the other hand, the movable mold plate 103 is formed with a runner groove 107 for connecting the sprue hole 105 and the cavity 104 and allowing resin to flow into the cavity 104.
Four male parts 108 are formed.

The movable mold plate 103 has an ejector mechanism 109 for ejecting a molded product.
The ejector mechanism 109 includes a plurality of ejector pins 110 and an ejector plate 111, and is configured to protrude and separate a molded product fixed to the male mold portion 108 of the cavity 104 and a runner fixed to the runner groove 107. Has become.

[0004]

Here, since the molded product and the runner protruded by the ejector pin 110 are protruded from the mold in a connected state, the sprue is then gripped by a robot or the like, and then It was placed on a separating device to separate the molded product from the runner. However, generally, a molded product or a runner protruding from a mold tends to shrink, and shrinks or deforms in the process of being conveyed to the separation device (see FIGS. 11 and 12) and is placed on the separation device. If it becomes impossible, or if it is placed on the separation device, it will not be able to accurately position it, and it will damage the molded product during separation, or part of the runner will remain on the molded product There was a case.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an injection molding mold apparatus comprising a fixed mold plate and a movable mold plate. The gist of the invention is that a hole is formed in the template so that a projection is formed upright from the runner.

[0006]

The molded product and the runner are separated from each other while maintaining their shape while being fixed to the movable mold plate before contraction.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment of the present invention. Reference numeral 1 denotes a mold device for injection molding, which comprises a fixed mold plate 2 and a movable mold plate 3. A cavity 4 for molding a molded product is provided in the fixed mold 2.
A sprue hole 5 through which resin flows into the cavity 4 and a female mold portion 6 of the cavity 4 are formed. In addition, the female mold part 6
A hole X is formed in the vertical direction in FIG. The hole X is connected to a runner groove 7 described later, and a projection is formed on the runner during molding.
In this embodiment, the hole Y is formed at a position opposite to the hole X, but this is not always necessary. Further, the position of the hole X may be an appropriate position, but it is preferable to form the hole X near the cavity 4 (gate hole) as in the present embodiment in consideration of accuracy later.

On the other hand, the movable mold plate 3 is formed with a runner groove 7 for connecting the sprue hole 5 and the cavity 4 and allowing the resin to flow into the cavity 4.
Also, the male part 8 of the cavity 4 is formed.

The movable mold plate 3 has an ejector mechanism 9 for projecting a molded product. The ejector mechanism 9 includes a plurality of ejector pins 10 and an ejector plate 11, and projects and separates a molded product 12 fixed to the male die 8 of the cavity 4 and a runner 13 fixed to the runner groove 7. It has become. In this embodiment, at least the ejector pin 10 is located at the position of the hole Y.
Reference numeral 14 denotes a fine gate hole for connecting the cavity 4 and the runner groove 7.

Next, a robot hand 15 which grips the molded product 12 and the runner 13 and conveys it to a predetermined separating device.
Will be described. The robot hand 15 includes an arm 16 that can move forward and backward, a plate 17 fixed to the tip of the arm 16, and the like. The plate 1
7, a sprue 18 penetrates, and the sprue 1
A through-hole 19 in which a chuck device for gripping the inside 8 is provided, and a through-hole 21 into which a projection 20 formed upright on the runner 13 is inserted. A projection 20 is formed in this through hole 21.
Is inserted to prevent the shrinkage and deformation of the runner 13.

Next, the operation will be described. The sprue hole 5, the runner groove 7, and the gate hole 14 are shown in the state shown in FIG.
The resin is caused to flow into the cavity 4 via. Then
The movable mold plate 3 is moved to be separated from the fixed mold plate 2,
At this time, the molded product 12 and the runner 13 are separated from the female mold part 6 and the like and remain on the movable mold plate 3. This is because the molded product 12 shrinks and adheres to the male mold portion 8. Here, the robot hand 15 is caused to enter between the fixed mold plate 2 and the movable mold plate 3, and the sprue 18 and the projection 20 formed in the runner 13 are formed in the through hole 19 formed in the plate 17. And the sprue 18 is gripped by a chuck device (not shown) (see FIG. 3). Next, the ejector mechanism 9 is actuated by further moving the movable side mold plate 3 so that the molded product 12 and the runner 13 are protruded and separated from the male mold portion 8 and the runner groove 7. Are also moved backward in a synchronized state (see FIG. 5). Next, the robot hand 15 holding the molded product 12 and the runner 13 is positioned on a separation device (not shown), and the molded product 12 and the runner 13 are placed. And the runner 13 are separated.

Next, a second extracting method will be described. The movable mold plate 3 is operated to be separated from the fixed mold plate 2. At this time, the ejector mechanism 9 is operated until the ejector mechanism 9 is slightly operated. Specifically, the molded product 12 or the runner 13 is moved away from the male mold portion 8 or the runner groove 7, and the operation is performed to such a position that the projection formed by the hole Y does not come out of the hole Y. Next, the robot hand 15 is made to enter, the sprue 18 is gripped in the same manner as in the previous example, and the robot is retracted until the projection comes out of the hole Y. Next, the gripped molded product or runner is transported to a separation device to separate the molded product and the runner.

A second embodiment will be described with reference to FIGS. In the present embodiment, the runner grooves 2
4, and a hole 25 is formed upright from the runner groove 24 in the same manner as in the previous example. Of course, this hole 25
Is a hole for forming a projection on the runner. And
Further, a runner lock mechanism 27 is employed for the movable mold plate 26 in this embodiment. On the bottom surface of the plate 30 of the robot hand 29 which holds the sprue 28, a vertical groove 32 for inserting the runner 31 and a bottomed hole 34 for inserting the projection 33 formed by the hole 25 are formed. I have. By inserting the runner 31 into the vertical groove 32 and by inserting the projection 33 into the bottomed hole 34, the shrinkage and deformation of the runner 31 during transport can be further prevented.

Next, the operation will be described. From the state shown in FIG. 5, resin is poured into the cavity 4 as in the first embodiment. Next, the movable mold plate 26 is operated to separate from the fixed mold plate 23. Here, the robot hand 29 is operated, and the vertical groove 32 of the plate 30 is inserted into the runner 3.
1 is fitted, and the bottomed hole 34 is positioned so that the projection 33 is fitted (see FIG. 6). Next, the movable mold plate 26 is further operated, and the robot hand 29 is also retracted in conjunction with the movement. At this time, the runner lock mechanism 27 operates, and the runner lock pin 35 comes out of the runner 31 (see FIG. 7). Next, as in the first embodiment, the robot hand 29 holding the molded product 12 and the runner 31 is positioned on a separating device (not shown), and the molded product 12 and the runner 31 are placed thereon. To separate the molded product 12 from the runner 31.

As described above, in the first embodiment and the second embodiment,
Although the horizontal injection type injection molding die has been described, the cooling rate after the molding is not uniform, and the parting injection type die (see FIG. 11) having a large shrinkage and deformation, and a large number of pieces. It is particularly preferable to apply to a mold for taking (see FIG. 12).

[0016]

According to the present invention, there is provided an injection mold apparatus comprising a fixed mold plate and a movable mold plate, wherein the fixed mold plate is provided with a hole in which a projection is formed upright from a runner. Since it is formed, the molded article and the runner can be surely and accurately separated.

[Brief description of the drawings]

FIG. 1 is a front sectional view at the time of injection molding of a first embodiment of the present invention.

FIG. 2 is an AA plane sectional view of FIG.

FIG. 3 is a front sectional view when the sprue of FIG. 1 is gripped by a robot hand.

4 is a front sectional view when the ejector mechanism of FIG. 3 operates.

FIG. 5 is a front sectional view at the time of injection molding of a second embodiment of the present invention.

FIG. 6 is a front sectional view when the sprue of FIG. 5 is gripped by a robot hand.

FIG. 7 is a top view of FIG. 6;

FIG. 8 is a front sectional view when the runner lock mechanism of FIG. 6 is operated.

FIG. 9 is a front sectional view at the time of conventional injection molding.

FIG. 10 is a front sectional view when FIG. 9 is opened.

FIG. 11 is a plan view showing a conventional four-piece molded product, a runner and a gate.

FIG. 12 is a plan view showing a conventional eight-piece molded product, a runner and a gate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mold apparatus for injection molding 2 fixed mold plate 3 movable mold plate 4 cavity 5 sprue hole 6 female mold section 7 runner groove 8 male mold section of cavity 9 ejector mechanism 10 ejector pin 11 ejector plate 12 molded product 13 Runner 14 Gate Hole 15 Robot Hand 16 Arm 17 Plate 18 Sprue 19 Through Hole 20 Projection 21 Through Hole 23 Fixed Side Plate 24 Runner Groove 26 Movable Side Plate 27 Runner Lock Mechanism 28 Sprue 29 Robot Hand 30 Plate 31 Runner 32 Vertical Groove 33 Projection 34 Hole with bottom 35 Runner lock pin 36 Gate X, Y hole

Claims (1)

[Claims] 1. An injection molding apparatus comprising a fixed mold plate and a movable mold plate, wherein said fixed mold plate is provided with a hole in which a projection is formed upright from a runner. Characteristic mold equipment for injection molding.