JP4050154B2 - Injection molding apparatus and injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection molding machine and an injection molding machine equipped with an injection molding machine, and more particularly to an apparatus suitable for trial production and small-scale production.
[0002]
[Prior art]
In the conventional injection molding apparatus, the fixed mold is detachably mounted on the fixed mold mounting board and the movable mold is detachably mounted on the movable mold mounting board, the mold is clamped, and the cavity is injection filled. After the molded product was opened, an ejector pin to be ejected was slidably attached to the movable mold. In addition, a mold has been proposed in which a plurality of different cavities are provided in order to produce a variety of small-volume production products, and a variable runner plate is used to switch the flow path for selecting the cavities (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-156894
[Problems to be solved by the invention]
However, in the above-mentioned conventional technology, if the molded product changes, the position of the ejector pin is often changed, and not only the mold but also the mold mounting board must be newly manufactured. There was a problem that large waste was generated and it was not suitable for small-quantity, multi-product production. Providing cavities for different molded products in one mold complicates the mold structure and cannot cope with large molded products.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide an injection molding apparatus and an injection molding machine that can be applied to the production of a small variety of products with a short production period and no production cost.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a movable mold mounting plate is provided on a fixed side of a fixed mold mounting plate that receives a nozzle touch of a nozzle for injecting molten resin, An injection mold that forms a cavity in the shape of a molded product with a mold and a movable mold is disposed between the two mounting plates, the fixed mold is mounted on the fixed mold mounting plate, An ejector mechanism that protrudes and removes the molded product from the movable mold is provided .
The fixed mold mounting plate is provided with at least one hot runner connected to the nozzle and provided with heating means, and the injection mold includes a hot runner connected to the hot runner and the cavity. The injection molding apparatus is characterized by being provided according to the number of runners .
[0007]
According to the above configuration, a new molded product can be produced as long as an injection mold having an ejector mechanism is produced without changing the fixed mold mounting plate and the movable mold mounting plate. Therefore, it is possible to provide an injection molding apparatus and an injection molding machine that have a short production period, do not require production costs, and can be applied to production of a small variety of products.
Further, the fixed mold mounting plate is provided with at least one hot runner connected to the nozzle, and the injection mold includes a number of hot runners connected to the hot runner and the cavity. The injection molding apparatus is characterized by being provided together. In addition to the effect of claim 1, in addition to the effect of claim 1, it is provided on the fixed-side mold mounting plate that does not need to change the hot runner part where the heating means must be provided, and the injection mold is a cold runner. It is unnecessary for the parts that must be made, and the mold is simplified .
[0008]
According to a second aspect of the present invention, in the first aspect, at least one hot runner connected to the nozzle is provided on the fixed-side mold mounting plate, and the injection mold includes the hot runner and the hot runner. A cold runner connected to the cavity is provided in accordance with the number of hot runners. In addition to the effect of claim 1, in addition to the effect of claim 1, it is provided on the fixed-side mold mounting plate that does not need to change the hot runner part where the heating means must be provided, and the injection mold is a cold runner. It is unnecessary for the parts that must be made, and the mold is simplified.
[0009]
The invention according to claim 2 is characterized in that, in claim 1, at least one positioning means for determining a positional relationship between the fixed-side mold mounting plate and the fixed-side mold is provided. This is an injection molding device. According to such a configuration, in addition to the effect of the first aspect, the injection mold can be mounted accurately and quickly.
[0010]
According to a third aspect of the present invention, in the first aspect, the movable-side mold mounting plate accommodates an ejector plate of the ejector mechanism that is urged to protrude from the movable-side mold, and is moved by pressing by an ejector rod. The injection molding apparatus is characterized in that a recess is made possible. According to such a configuration, in addition to the effect of the first aspect, since the ejector plate storage portion and the movement distance thereof are secured in the recess of the movable side mold mounting plate, the entire apparatus can be reduced in size.
[0011]
According to a fourth aspect of the present invention, in the third aspect , the ejector mechanism is configured such that the ejector plate can be moved forward and backward with a plurality of guide rods slidably provided on the movable mold, and the molded product is At least one ejector pin to be protruded is provided on the ejector plate so as to be able to penetrate the movable side mold. According to such a configuration, in addition to the effect of the third aspect , the ejector pin can be stably advanced and retracted.
[0012]
The invention according to claim 5 is the injection mold according to any one of claims 1 to 4 , wherein the fixed mold is on the fixed mold mounting plate, and the movable mold is on the fixed mold. The injection molding apparatus is characterized in that it is detachably mounted on the movable side mold mounting plate so that the mold clamping die can be opened, and is integrally detachable from the fixed side mold mounting plate. According to such a configuration, in addition to the effects shown in claims 1 to 4 , it is possible to provide an injection molding device that can be easily attached and detached.
[0013]
The invention according to claim 6 is an injection molding apparatus according to any one of claims 1 to 5 , a mold clamping apparatus for advancing and retracting the movable mold mounting plate of the injection molding apparatus to open the mold clamping mold, and The injection molding machine includes an injection device for injecting molten resin from the nozzle. According to such a configuration, it is possible to provide an injection molding machine that has a short production period, does not require production costs, and can be applied to the production of a small variety of products.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings showing this embodiment. FIG. 1 is a central cross-sectional view showing a mold clamping state of an injection mold, and the injection molding machine is composed of an injection molding apparatus 10, a mold clamping apparatus, and an injection apparatus 90 in which a nozzle 90a is shown. The mold mounting plate shown in a perspective view in FIG. 3 is configured such that a fixed mold mounting plate 60 and a movable mold mounting plate 70 are relatively movable by tie bars 71 (not shown in FIG. 1) provided at four corners. Yes.
[0015]
An injection mold 50 shown in a perspective view in FIG. 4 includes a fixed mold 20, a movable mold 30, and an ejector mechanism 40 provided on the movable mold 30, and a nozzle touch of a nozzle 90a that injects molten resin. It is mounted between a fixed mold mounting plate 60 for receiving and a movable mold mounting plate 70 provided so as to be movable forward and backward. An injection mold 50 in which a cavity C having a molded product P shape is formed by combining the fixed mold 20 and the movable mold 30 is disposed between the mounting plates 60 and 70 and fixed. The side mold 20 is mounted on the fixed mold mounting board 60 by means described later.
[0016]
On the other hand, the movable die 30 is provided with an ejector mechanism 40 that projects and removes the molded product P. The ejector mechanism 40 includes an ejector plate 41 placed in parallel with the back surface opposite to the cavity C forming side of the movable mold 30, and a plurality of guide rods 42 (standing upright from the ejector plate 41). 4) and at least one ejector pin 43 as required. The ejector rod 80 and the ejector pin 43 slide through the movable side mold 30 and the ejector plate 41 is projected and urged by the head 42a of the ejector rod 80 by a spring or the like (not shown). Is held at a certain distance from The tip of the ejector pin 43 forms the same surface as the cavity C and constitutes the surface of the molded product P.
[0017]
According to the above configuration, a new molded product can be produced as long as the injection mold 50 provided with the ejector mechanism 40 is produced without changing the fixed mold mounting plate 60 and the movable mold mounting plate 70. Can do. Therefore, it is possible to provide an injection molding apparatus and an injection molding machine that have a short production period, do not require production costs, and can be applied to production of a small variety of products.
[0018]
The fixed-side mold mounting board 60 is provided with at least one hot runner 61 connected to the nozzle 90a described above and opening on the opposite side as required, and heating means (not shown) so that the molten resin to be injected is not solidified. It is warmed by. The injection mold 50 is provided with hot runners 61 and cold runners 51 connected to the cavity C according to the number of hot runners 61. In this way, only the passage is provided in the injection mold 50 that is provided on the fixed mold mounting plate 60 that can be shared without changing the portion of the hot runner 61 in which the heating means must be provided, and needs to be changed for each molded product P. By providing a cold runner, the portion that does not need to be changed is shared, and the injection mold 50 is simplified.
[0019]
As shown in FIG. 5, positioning means 62 and 63 for determining the positional relationship between the fixed-side mold mounting board 60 and the fixed-side mold 20 are provided at least in one place with an appropriate number and type. Yes. As for the positioning means 62, the unevenness | corrugation which mutually fits is formed in the surface where a mold clamping direction opposes, respectively. Which surface the convex mold is formed on is free, but when a convex mold is formed in the vicinity of the opening of the hot runner 61 on the fixed mold mounting plate 60, it is hot when the fixed mold 20 is attached or detached. The runner 61 is not damaged. The positioning means 63 is freely formed on the upper surface and the lower surface so as to form a pair of peaks and valleys.
[0020]
Further, the fixed mold mounting plate 60 has claws 64 mounted at the four corners of the surface on which the fixed mold 20 is mounted. Similarly, a claw 73 is also attached to the movable-side mold attachment board 70 (see FIG. 3). Engaging recesses 21 and 31 are provided on the side surfaces of the fixed mold 20 and the movable mold 30 at positions corresponding to the claws 64 and 73. Accordingly, the fixed-side mold 20 is attached to the fixed-side mold attachment board 60 with the claws 64, and the movable-side mold 30 is attached to the movable-side mold attachment board 70 with the claws 73. With such a configuration, the injection mold 50 can be accurately and quickly mounted on the fixed mold mounting plate 60 and the movable mold mounting plate 70.
[0021]
The movable mold mounting plate 70 is provided with a recess 72 that accommodates the ejector plate 41 of the ejector mechanism 40 that is projected and biased to the movable mold 30 and can be moved by pressing by the ejector rod 80. It has been. That is, since the portion for storing the ejector plate 41 and the moving distance thereof are secured in the recess 72 of the movable-side mold mounting plate 70, the entire apparatus can be reduced in size.
[0022]
The ejector mechanism 40 has a plurality of guide rods 42 slidably provided on the movable mold 30 to allow the ejector plate 41 to advance and retreat, and at least one ejector pin 43 that protrudes and removes the molded product P has a movable mold. An ejector plate 41 is provided so as to be able to penetrate the mold 30.
[0023]
The injection mold 50 is configured such that the fixed mold 20 is detachably mounted on the fixed mold mounting board 60 and the movable mold 30 is detachably mounted on the movable mold mounting board 70 so that the mold clamping mold can be opened. Moreover, it can be attached to and detached from the fixed-side mold mounting board 60 integrally. That is, in the injection molding apparatus 10, the injection mold 50 is easily attached to and detached from the mounting plates 60 and 70 described above.
[0024]
Next, handling of the injection molding apparatus and the injection molding machine having the above-described configuration will be described. In FIG. 6, the fixed platen 100 and the movable platen 110 are open and separated from each other, the fixed side mold mounting plate 60 is attached to the fixed platen 100, and the movable side die mounting plate 70 is attached to the movable platen 110. It has been.
[0025]
In the state shown in FIG. 6, the injection mold 50 is suspended from above. Then, as shown in FIG. 7, the injection mold 50 is attached and fixed to the fixed mold mounting board 60 by hooking the claw 64 in the engagement recess 21 as shown in FIG. 5. Next, as shown in FIG. 8, the movable platen 110 is moved closer to the fixed platen 100 by the mold clamping device 120, the movable side mold mounting plate 70 is brought into contact with the movable side die 30 of the injection mold 50, The claw 73 is hooked and fixed to the engagement recess 31 (see FIGS. 4 and 5). At this time, the ejector plate 41 and the like of the ejector mechanism 40 are accommodated in the recess 72 of the movable mold mounting plate 70 as shown in FIG.
[0026]
Since this is also a mold-clamped state as shown in FIG. 1, when the molten resin is injected by causing the nozzle 90a of the injection device 90 to touch the hot runner 61 of the fixed mold mounting plate 60 and injecting the molten resin, The cavity C is filled through the runner 51. And hold for a predetermined time.
[0027]
Next, when the mold clamping device 120 is operated to open the mold, the mold is opened with the movable mold 30 attached to the movable mold mounting plate 70 as shown in FIG. That is, in the mold open state shown in FIG. 2, when the ejector rod 80 is pushed in, the ejector plate 41 advances while being guided by the guide rod 42, and at the same time, the ejector pin 43 also advances and protrudes, thereby The molded product P cut off at the boundary with the runner 61 and stuck to the movable mold 30 is ejected.
[0028]
When such an injection molding cycle is repeated and the desired number of molded articles P is obtained, the mold is clamped as shown in FIG. 70, and the injection mold 50 is attached to the stationary platen 100 as shown in FIG. Then, by removing the claw 64, the injection mold 50 is freed from the fixed mold mounting plate 60 and lifted as shown in FIG. 6 to remove the injection mold 50. Then, a new injection mold 50 can be mounted.
[0029]
【The invention's effect】
As described above, according to the present invention, since only the part that must be changed depending on the molded product is replaced as an injection mold, the production period is short, the production cost is not required, It is possible to provide an injection molding apparatus and an injection molding machine that can be applied to the production of the above.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an injection molding apparatus in a mold clamping state.
FIG. 2 is a cross-sectional view of the injection molding apparatus in a mold open state.
FIG. 3 is an overall perspective view showing an assembled state of a mold mounting board.
4 is an overall perspective view of an injection mold 50. FIG.
FIG. 5 is a perspective view for explaining a mounting relationship between a fixed mold mounting plate and an injection mold.
FIG. 6 is an explanatory view of mounting an injection mold in an injection molding machine.
FIG. 7 is an explanatory view of mounting an injection mold in an injection molding machine.
FIG. 8 is an explanatory diagram of a mold clamping state in an injection molding machine.
FIG. 9 is an explanatory diagram of a mold opening state in an injection molding machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Injection molding apparatus 20 Movable side metal mold 21 and 31 Engaging recess 30 Fixed side metal mold 40 Ejector mechanism 50 Injection mold 60 Fixed side metal mold mounting board 70 Movable side metal mold mounting board 80 Ejector rod 100 Fixed board 110 Movable platen 120 mold clamping device

Claims (6)

A movable mold mounting plate is movably provided on the fixed mold mounting plate that receives the nozzle touch of the nozzle that injects the molten resin, and a cavity that is shaped as a molded product is formed by the fixed mold and the movable mold. An injection mold is disposed between the two mounting plates, the fixed mold is mounted on the fixed mold mounting plate, and an ejector mechanism is provided for protruding and removing the molded product from the movable mold .
The fixed mold mounting plate is provided with at least one hot runner connected to the nozzle and provided with heating means, and the injection mold includes a hot runner connected to the hot runner and the cavity. An injection molding apparatus provided according to the number of runners . In the injection molding apparatus according to claim 1 ,
An injection molding apparatus characterized in that at least one positioning means for determining a positional relationship between the fixed-side mold mounting plate and the fixed-side mold is provided . In the injection molding apparatus according to claim 1 ,
The movable mold mounting plate is provided with a recess that houses the ejector plate of the ejector mechanism that is biased to project the movable mold and that can be moved by pressing by an ejector rod. Injection molding equipment . In the injection molding device according to claim 3 ,
The ejector mechanism includes a plurality of guide rods slidably provided on the movable side mold to allow the ejector plate to move forward and backward, and at least one ejector pin for projecting and removing the molded product includes the movable side mold. An injection molding apparatus is provided on the ejector plate so as to be able to pass through the ejector plate . In the injection molding device according to any one of claims 1 to 4 ,
The injection mold is detachably mounted on the fixed mold on the fixed mold mounting plate and the movable mold on the movable mold mounting plate so that the mold clamping mold can be opened. An injection molding apparatus characterized by that . An injection molding apparatus according to any one of claims 1 to 5, a mold clamping apparatus that moves the movable mold mounting plate of the injection molding apparatus forward and backward to open a mold clamping mold, and the injection molding apparatus. An injection molding machine comprising: an injection device for injecting molten resin from the nozzle .

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