JPH03197015A - Mold device - Google Patents

Abstract

PURPOSE:To commonize the whole of a commonizable part such as a holder to which a variable part is fitted, structure of a molding part of a molding machine can be made simple and handling is made more easy, by a method wherein a guide bar is provided in a standing state on the rear of the movable core type holder and a push motion plate, which is energized always in a mold breaking direction and pushed and moved by making an extrusion pin abut against the rear surface, is provided slidably. CONSTITUTION:A stationay core mold 14 and movable core mold 16 are clamped, resin is filled into a cavity through a nozzle and molding is performed by a method wherein a movable platen 12 is pushed and moved. An extrusion pin 56 is extruded along with mold break, a push motion plate 44 is pushed and moved, an ejection pin 54 is ejected and a molded product is released. The push motion plate 44 is returned up to the original position where the push motion plate 44 abuts against a stopper 52 with energizing force of a spring 50 along with returning of the extrusion pin 56. Continuous resin molding is performed by repeating those actions.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a mold apparatus.

(Prior technology) A synthetic resin injection molding machine has a mold installed between a fixed plate and a movable plate, and fills the cavity with molten resin from a nozzle through a resin path provided in the mold. Shape.

Conventional mold equipment applies an extremely large amount of pressure during molding, so it is necessary to have a structure that can withstand this pressure.In order to improve molding accuracy, the mold must be opened and closed smoothly, and the molded product can be ejected smoothly. Mold devices are becoming more complex and larger because guide pins and the like that guide the mold need to be provided with high precision.

In addition, the need to manufacture a wide variety of products has increased recently, and the manufacturing cycle is becoming shorter.Therefore, there is a need to shorten the manufacturing time of molds, and in manufacturing operations, it is necessary to manufacture a wide variety of products. In addition, there is a strong demand for a mold device that can improve work efficiency in installing and removing molds from molding machines.

(Problems to be Solved by the Invention) As a mold device that can suitably handle the above-mentioned high-mix, low-volume production, there is, for example, a method using a nest. In this method of using nests, a holder part is provided on a fixed platen or a movable platen, and a nest with a cavity for molding is fitted into this holder part to form a mold device.The nests are set to a common standard. Each product can be replaced and attached to the holder. According to the mold device using this nest, handling is easy because all you have to do is replace the nest when manufacturing another product, and by allowing multiple nests to be attached to the holder, It has the advantage of being able to mold different types of products at the same time.

However, this conventional mold device using a nest,
Since the insert is attached from the side of the holder, there are problems in that the attachment retention of the insert is insufficient, and types that are attached from the side do not have sufficient pressure resistance and moisture resistance. be. Additionally, in the past, multiple guide pins were provided in order to achieve precision when matching the molds, but in this case, a clearance is provided between the guide pin and the guide bushing, and a clearance is also provided between the nest and the nest holder. There was a problem in that double clearance was required because of the distance, and high-precision mold matching was impossible.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to make it possible to create a mold device by replacing only the variable part of the mold, so that the variable part can be attached. To provide a mold device which is easier to handle by making all parts that can be shared, such as a holder part, and simplifying the structure of the molding part of a molding machine.

(Means for solving problems) The present invention has the following configuration to achieve the above object.

That is, a fixed insert to be attached to a fixed plate and a movable insert to be attached to a movable plate are formed by fitting a core formed variably depending on the product into a holder formed to a predetermined standard size, and then inserting the core into the movable plate. A support plate is fixedly installed, and a fitting hole in which the movable insert is fitted is provided in the support plate, penetrating to the movable plate surface, so that the movable plate surface inside the fitting hole is pushed into the fitting hole when the mold is opened and closed. An ejector pin is provided that protrudes in and out of the holder, and a guide bar is provided erected at the rear of the holder of the movable inserter, so that the ejector pin is normally biased in the mold opening direction and is pushed when the ejector pin comes into contact with the rear surface. dynamic play 1
- is provided in a slidable manner.

(Function) For fixed and movable inserts, replace the core part depending on the product and attach it to the holder. During molding, the movable platen is pushed and the fixed and movable molds are closed, and resin is filled into the cavity of the core portion. After molding, when the mold is opened, the ejector pin comes into contact with the pushing plate and pushes it, releasing the molded product.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the mold apparatus according to the present invention, in which a fixed platen 10 and a movable platen 12 are fitted with a set of inserts. Hereinafter, the insertion preparation for fitting the fixed platen 10 will be referred to as the fixed insertion preparation, and the insertion preparation for fitting the movable platen 12 will be referred to as the movable insertion preparation.

The fixing preparation 14 is fixedly installed on the fixed platen 10 by being fitted into a fitting recess provided in the platen 20. An injection nozzle is installed behind the fixed platen 10, and the nozzle abuts against the rear surface of an injection bush 22 provided on the fixed insertion preparation 14. For installation, the board 20 is provided with a guide bush 24 into which a guide pin slides and guides the fixed insert 14 and the movable insert 16 during mold matching. The guide pin 26 is erected on the movable nesting mold 16 side. In addition, for installation, a water hole 28 is provided in the board 20 for controlling the temperature of the fixed container 14. The fixing case 14 has a core that is variably formed depending on the product and a holder that fixes and holds the core.

The movable nesting fingers 16 are fixed to a support plate 30 fixed to the movable plate 12. As shown in FIG. 1, the support plate 30 is provided with a fitting hole 32 into which the movable nesting finger 16 is fitted, and the movable nesting finger 16 is fitted into the fitting hole 32. The fitting hole 32 is provided to penetrate the support plate 30, and its rear surface is regulated by the plate surface of the movable plate 12.

The movable nesting fingers 16, like the fixed nesting fingers 14 described above, have a core that is variably formed depending on the product and a holder that accommodates the core, and in the embodiment, the planar shape is a rectangular frame shape as shown in FIG. A core 42 is fitted into an eggplant holder 40.

As shown in FIG. 1, the holder 40 of the movable nesting finger 16 is formed to have a predetermined thickness necessary for fitting the core 42 into the support plate 30.
Fixed. The inside of the fitting hole 32 at the rear of the holder 40 is a space for storing a movable part, and the push plate 44 inserted into the fitting hole 32 is inserted into a through hole provided at each corner of the rear wall of the holder 40. A provided guide bar 46 is inserted through the push plate 44 to support the push plate 44 so as to be movable forward and backward. The push plate 1-44 is a plate-shaped body, and in the embodiment, two plate-shaped bodies are used by stacking them together. The through holes are formed in accordance with the arrangement positions of each guide bar 46. In order to eliminate play between the guide bar 46 and the push plate 44 during forward and backward movement, a collar 48 is provided in the through hole of the push plate 44. is installed internally. The accuracy of the alignment between the guide bar 46 and the collar 48 is set as high as possible to improve the molding accuracy. Accurate parallel movement of the pushing plate 44 is important for correctly taking out the molded product, ensuring high quality and
This is the key to longer life. Note that the guide bar 46 is fixed to the rear part of the holder 40 with a certain precision by screwing or the like as shown in the figure.

Between the rear wall surface of the holder 40 and the push plays 1 to 44,
A spring 50 is fitted over the guide bar 46 and is biased to spring between the holder 40 and the pushing plate 44. Further, a stopper 52 for regulating the return position of the push plate 44 is fixed to the tip end of the guide bar 46 on the support plate 12 side. The push play j-44 is normally operated by the spring 52.
, and comes into contact with the stopper 52 . Since the stopper 52 defines the return position of the pushing plate 44,
By appropriately setting the thickness of the stopper 52, the return position of the push plate 44 can be appropriately set with respect to the core used in manufacturing various products.

The return position of the push plate 44 is set at a slight distance from the support plate 12 so that even if a foreign object enters between the push plate 1 44 and the support plate 12, it always returns to a fixed position. It is also for the purpose of Conventional mold devices also use a stop pin or the like to regulate the return position, and the stopper 52 described above has a similar function. Further, the guide bar 46 and the stopper 52 function as support pins in the conventional device.

Note that an ejecting pin 54, which is installed in combination with the core 42, is provided on the push play 1-44 so as to face the core. The forward and backward movement of the above-mentioned push play 1-44 is performed using the ejecting pin 54.
This corresponds to the protrusion/extraction operation.

Being able to accurately set the return position of the push plate 44 is extremely important in improving the molding accuracy of the product.

In the usage method of the embodiment, a plurality of cavities are usually formed in the core, and a plurality of ejecting pins 54 are arranged corresponding to these cavities.

The movable platen 12 moves forward and backward in conjunction with a mold clamping cylinder, etc., and the push-out pins 56 protrude and enter from the plate surface opposite to the rear surface of the push plate 44.
Press the rear surface of the Since the protrusion length of the push-out pin 56 from the surface of the movable platen 12 is usually set constant by the molding machine, by appropriately setting the thickness of the input head 52, the length of the push-out play plate 1-44 can be substantially adjusted. The pressing range can be set variably.

Note that due to product design requirements, the ejector pin 5
If it is necessary to increase the protrusion length of the guide bar 46, the stroke length can be made variable by increasing the length of the guide bar 46.

The support plate 30 is provided with a water hole 28 for warm opening, similar to the mounting plate 20.

FIG. 2 is a front view showing a state in which the movable nesting type 16 is fitted into the support plate 30. Holder 40 into which core 42 is fitted
is fitted into the fitting hole 32 as shown in the figure, but the holder 40
In order to position and fix the holder 40 to the support plate 30, tapered recesses 60 are provided on two adjacent sides of the rectangular fitting hole 32, and the holder 40 is fitted into the inner wall surface of the tapered recess 60 and into the fitting hole 32. The wedge body 62 is inserted between the outer wall surfaces of the. The tapered recess 60 is formed into a tapered surface whose back side from the mold opening/closing surface gradually approaches the outer wall of the holder 40, and the surface of the wedge body 62 that comes into contact with the inner wall surface of the tapered recess 60 is formed into a tapered surface.

When setting the holder 40 fitted with the core 42, the holder 40 is inserted into the fitting hole 32 from the mold opening/closing direction, the wedge body 62 is fitted and bolted. Tapered recess 60
The two surfaces of the fitting hole 32 on which no .

Incidentally, the push plate 1-44 and guide bar 46 shown in FIG. 1 are of course also fitted into the fitting hole 32 together with the holder 40. In FIG. 2, the push plate 44 is shown in broken lines. The push play 1-44 is formed into a substantially H shape as shown in the figure.

The above-mentioned fixed nesting type 14 is attached to the board 20 in the same manner as the movable nesting type 16 described above, and a wedge body is inserted and tightened from two sides.

FIG. 3 shows the parting surfaces of the fixed nesting type 14 and the movable nesting type 16. Figure 3(a) shows the fixed nesting type 14.
, FIG. 3(b) is a movable nested type. 40a is a holder for the fixed nesting type 14, and 42a is a core fitted into the holder 40a.

The holders 40, 40a fit into each other when the mold is closed.

Cores 42.42a are also fitted together to form a cavity for filling with resin. As described above, during mold clamping, the mounting plate 20 and the support plate 30 are positioned by the guide pin 26 sliding into the guide bush 24, but in this embodiment.

At the same time, a flange 60.60a is placed on the end surface of the holder 40.40a so that the mold matching surface of the holder 40.40a fits.
is installed protrudingly. Flange 60.6 as shown in FIG.
The fitting surface 0a is formed into a tapered surface so that the holders are tightened together when force is applied in the mold closing direction.

The flange 60 and flange 60a engage in a convex-concave manner during mold matching in this way, but the flange 60 and flange 60a are arranged so that the inner and outer positions of the flanges 60 and 60a on two adjacent sides of the holder 40 and holder 40a are reversed. It is set to . That is, when a pair of opposing flanges 60 of the holder 16 are both located on the inside of the end face of the holder 40, the flange 60 on the other opposing side is located on the outside so that the holder 40a fits therein. . As a result, when the mold is clamped, a force is applied to the holder 40 so that the flange 60 installed on the inside is contracted more inward, and the flange 60 installed on the outside is expanded outward. force acts on In this way, the mold clamping force applies opposite forces to the pair of two opposing sides of the holders 40 and 40a, so that the holders 40 and 40a are fitted together. In this embodiment, as shown in FIG. 3, an L-shaped engaging portion 62 is provided at the connecting portion of adjacent flanges in consideration of the effect of the above force, and a portion that prevents the flanges 60.60a from deflecting outward. has been established. This makes it possible to perform mold matching with higher precision than in conventional mold matching using only the guide pin 26 and guide bush 24.

Core 42.42a fitted into the holder 40.40a
A molding cavity is provided as appropriate depending on the product. Third
Figure (b) shows an example of a runner 64 and a cavity 66 provided in the core 42. The number of cavities formed in the core 42 is of course not particularly limited, but in the case of small products, it is common to provide a plurality of cavities to increase manufacturing efficiency. In the core 42a, 68 indicates a resin injection hole.

The core 40.42a is a part that varies depending on the product, and can be formed into an appropriate shape depending on the product.

In addition, for products that are extremely fine and require high precision, the processing of the core 42 becomes extremely complicated.
The core 42 does not necessarily consist of a single mold. That is, one cavity is often assembled from a plurality of members. Therefore, in such a case, the core 42 will consist of a plurality of units. In the case of a plurality of units as described above, there is an advantage that production can be started after one cavity has been manufactured in actual manufacturing work. In full-scale production, for example, six cavities are manufactured as shown in Figure 3), but if it takes time to manufacture one cavity, it is necessary to first manufacture one cavity. At this point, production can proceed with one cavity, and then, when the cavity is created, it can be incorporated into the core and production can be carried out with two cavities.It is possible to produce according to the manufacturing of the mold. This method is suitable when the cavity part has a complicated shape and cannot be assembled in a short time, and is extremely effective in that it allows effective use of the molding machine.

Incidentally, it is of course possible to attach a plurality of the fixed inserting charms 14 and movable inserting charms 16 to the fixed platen 10 and movable platen 12 by the same method as described above, and in this case, the core It is possible to attach and use the fixed inserting chuck 14 and the movable inserting chuck 16 as appropriate according to the progress of mold production for parts, etc., and it is also possible to manufacture different types of products by attaching different types of inserting chucks. .

In addition, in FIG. 1, the fixed platen 10 and the movable platen 12 are the heat insulating plate 1
1 to a surface plate 13 of the molding machine.

The operation of the mold apparatus according to the embodiment having the above configuration will be described below. When the movable platen 12 is pushed, the fixed insertion chamber 1
4 and the movable inserter 16 are closed, resin is filled into the cavity 66 from the nozzle and molded, and when the mold is opened, the push-out pin 56 is pushed out, and the push plate 4 is
4, the ejection pin 54 is ejected, and the molded product is released. As the push-out pin 56 returns, the pushing plate 44 is moved to the stopper 5 by the urging force of the spring 50.
It is returned to its original position where it contacts 2. Continuous resin molding is performed by repeating these operations.

As described above, the mold device of this embodiment has an ejecting pin 54 on the movable inserter 16 when viewed from its overall configuration.
By organically providing operating parts such as, it is possible to have an extremely simple structure and stabilize the operation, and by commonly using parts that can be shared, it is possible to make changes in product manufacturing. It is unique in that only the core part of the mold is manufactured, making it usable for general purposes.

The present invention has been variously explained above with reference to preferred embodiments, but the present invention is not limited to these embodiments.
Of course, many modifications can be made without departing from the spirit of the invention.

(Effects of the Invention) According to the mold device according to the present invention, as described above, the overall configuration of the mold device can be extremely simplified, thereby providing operational stability and making it easy to install the mold. etc. can be made easier. In addition, by adopting a structure in which the core is fitted into a standardized holder, various products can be manufactured just by manufacturing the core part, making it easier to manufacture molds and assemble the device. It has great effects such as becoming.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an embodiment of the mold device according to the present invention, Fig. 2 is a front view showing a state in which a movable inserting member is attached to a support plate, and Figs. 3 (a) and (b) are It is a top view which shows the loading preparation surface of a fixed loading cha and a movable loading cha. DESCRIPTION OF SYMBOLS 10... Fixed plate, 12... Movable plate, 14... Fixed inserting cha, 16... Movable inserting cha, 20... Mounting plate, 26... Guide pin, 30... Support plate, 32... Fitting hole, 40.40a... Holder,
42.42a...core, 44...pushing plate,
46... Guide bar, 50... Spring,
52... Stopper, 56... Push-out pin. 60. 60a・Flange, 64・・Runner, 66・・Cavity.

Claims (1)

[Scope of Claims] 1. A fixed nesting mold to be attached to a fixed plate and a movable nesting die to be attached to a movable plate are formed by fitting a core formed variably depending on the product into a holder in which each of them is formed to a predetermined standard size. A support plate is fixed to the movable plate, and a fitting hole in which the movable nesting mold is fitted is provided in the support plate so as to penetrate to the movable plate surface, and the movable plate surface in the fitting hole is pressed when the mold is opened and closed. An ejector pin that is moved to protrude into and enter the fitting hole is provided, and a guide bar is provided upright at the rear of the movable nesting type holder, so that the ejector pin is normally biased in the mold opening direction and abuts against the rear surface. A mold device characterized in that a pressing plate is slidably provided to be pressed.