JPH0741646B2 - Mold equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device, and more particularly to a mold device using a nested mold.

(Prior Art) An injection molding machine mounts a mold on a fixed platen and a movable platen and fills a cavity with a molten resin through a resin passage provided in the mold to mold the resin.

Since a large amount of pressure is applied to the conventional mold device during molding, it is necessary to have a structure that can withstand this pressure, and to open and close the mold smoothly to improve molding accuracy and to eject the molded product smoothly. For this reason, it is necessary to provide a guide pin or the like for guiding the mold with high precision, and therefore the mold device is becoming more complicated and larger.

In addition, recently, the need to manufacture a wide variety of products is increasing, and the shortening of the manufacturing cycle is also advancing. Therefore, it is required to shorten the mold manufacturing time.
There is a demand for a mold device capable of improving workability such as mounting and dismounting a mold on and from a molding machine in accordance with the manufacture of various products.

(Problems to be Solved by the Invention) As a mold apparatus that can suitably cope with various types of small-quantity production as described above, there is a method using a nest, for example. The method of using this insert is to provide a holder part on a fixed platen or a movable platen, and insert the insert part into this holder part to make a mold device.Set the insert part to a common standard, replace it for each product and change the holder. It can be attached to the part. According to the mold device using this nest, it is easy to handle because it is only necessary to replace the nest when manufacturing another product, and it is possible to attach multiple nests to the holder part and It has the advantage that products can be molded simultaneously.

However, in this conventional mold device using the insert, since the insert is attached from the side of the holder part, the insert holding property of the insert is not sufficient, or the insert itself is not provided with a guide pin or the like. There is a problem that the structure of the nesting becomes complicated because of the structure for obtaining the positioning accuracy.

Further, in the conventional mold device using the nest, in order to obtain accuracy at the time of mold matching, a clearance is provided between the holder parts due to the guide pin and the guide bush, and a clearance is provided between the nest parts due to the guide pin and the guide bush. For this reason, there is a problem that double clearance is required and it is difficult to perform highly accurate mold matching.

The present invention has been made to solve these problems, and an object of the present invention is to make it possible to simplify the structure of the mold, facilitate the manufacture and assembly of the mold, and make the mold compact. (EN) It is possible to provide a mold device that can perform resin molding with high accuracy.

(Means for Solving the Problems) The present invention has the following configuration in order to achieve the above object.

That is, a fixed board and a movable board are fixed to a mounting board and a support board that are interchangeably mounted with a movable insert mold and a fixed board, and a guide pin is provided on a contact surface of the support board with the mounting board. A guide bush into which the guide pin slides is provided on the mounting board so that the support board and the mounting board can be positioned, and a mold main body provided on the fixed nesting mold and the movable nesting mold is a core for molding a product and a core. It is formed by a holder formed in a predetermined standard size that abuts the outer surface and holds the core, and on the end surface of the holder,
A flange having a tapered surface was provided for fitting the concave and convex to each other when the mold was closed to position the fixed nest mold and the movable nest mold relative to each other, and for tightening the cores of the fixed nest mold and the movable nest mold during mold clamping. It is characterized by

(Operation) In the mold device according to the present invention, the fixed insert mold and the movable insert mold are attached to the mounting plate and the support plate which are fixed to the fixed plate and the movable plate, respectively. The mounting plate and the support plate are positioned by the guide pins and the guide bushes, and the fixed nested mold and the movable nested mold are positioned by fitting the holders arranged on the outer surface of the core to each other when the molds are closed. A taper surface is formed on the flange formed on the end surface of the holder, and the fixed nested core and the movable nested core are clamped and supported by the mold clamping force.

(Examples) Hereinafter, preferred examples of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing an embodiment of a mold apparatus according to the present invention, in which a fixed plate 10 and a movable plate 12 are fitted with a pair of nesting molds. Hereinafter, the nesting type to be fitted on the fixed platen 10 is called a fixed nesting type, and the nesting type to be fitted on the movable platen 12 is called a movable nesting type. In addition, 11 is a heat insulation board and 13 is a surface plate.

The fixed nested mold 14 is a mounting plate 20 fixed to the fixed plate 10.
It is fitted and fixed in the fitting recess provided in the. An injection nozzle is arranged behind the stationary platen 10, and the injection nozzle abuts on the rear surface of an injection bush 22 provided in the fixed insert mold 14. A guide bush (24) is provided on the mounting board (20) for guiding and positioning the fixed insert mold (14) and the movable insert mold (16) when guide pins slide in during mold matching. Guide pin 26 is movable plate 12
The support plate 30 attached to the base plate is erected on the contact surface with the mounting plate 20. Further, the mounting board 20 is provided with a water hole 28 for controlling the temperature of the fixed insert mold 14. The fixed insert mold 14 has a core, which is a portion for molding a product, and a holder for fixing and holding the core.

The movable nesting mold 16 is fixed to a support plate 30 fixed to the movable plate 12. As shown in FIG. 1, the support board 30 is provided with a fitting hole 32 for fitting the movable insert mold 16, and the movable insert mold 16 is fitted in the fitting hole 32. The fitting hole 32 is provided so as to penetrate the support board 30, and its rear surface is restricted by the movable board 12.

The movable nesting mold 16 has a core which is a portion for molding a product and a holder for accommodating the core similarly to the fixed nesting mold 14, and in the embodiment, as shown in FIG. Assemble to hold the sides.

A core supported by a holder 40 as shown in FIG.
The inside of the fitting hole 32 at the rear of the 42 is a space for accommodating the movable part of the movable nesting mold 16, and the guide bar is erected at each corner of the rear wall surface of the holder 40 in the through hole provided in the pushing plate 44.
The push plate 44 is supported so that the push plate 44 can move forward and backward. The pushing plate 44 is a plate-like body, and in the embodiment, two plate-like bodies are integrally stacked and used. The through holes are formed in accordance with the arrangement positions of the respective guide bars 46, and in order to eliminate rattling between the guide bar 46 and the pushing plate 44 at the time of advancing and retracting, the through holes of the pushing plate 44 have collars 48. Is installed internally. The precision with which the guide bar 46 and the collar 48 are rubbed together is set as high as possible to enhance the molding precision. Accurate parallel movement of the pushing plate 44 is important for correctly taking out the molded product, which is a point of high quality and long life. The guide bar 46 is fixed to the rear portion of the holder 40 with a certain accuracy by screwing or the like as shown in the figure.

Between the rear wall surface of the holder 40 and the pushing plate 44, there is arranged a spring 50 which is externally inserted into the guide bar 46 and is biased so as to repel between the holder 40 and the pushing plate 44. Further, a stopper 52 for restricting the returning position of the pushing plate 44 is fixed to the tip of the guide bar 46 on the movable plate 12 side. Pushing plate 44
Is always repulsed by the spring 50 and is in contact with the stopper 52. Since the stopper 52 regulates the returning position of the pushing plate 44, the returning position of the pushing plate 44 can be appropriately set by appropriately setting the thickness of the stopper 52. In addition, the return position of the pushing plate 44 is set to the movable plate 12
The reason why the distance is set slightly apart from is that the foreign matter is always returned to a fixed position even if a foreign matter enters between the pushing plate 44 and the movable platen 12. In the conventional mold device, the return position is regulated by using a stop pin or the like, but the stopper 52 has the same function as this. Further, the guide bar 46 and the stopper 52 have a function of a support pin in the conventional device.

The push-out plate 44 is provided with a protruding pin 54, which is installed in combination with the core 42 so as to face the core. The forward / backward movement of the pushing plate 44 corresponds to the projecting / inserting operation of the projecting pin 54. Accurately setting the return position of the pushing plate 44 is extremely important for improving the molding accuracy of the product. In the method of use of the embodiment, it is usual to form a plurality of cavities in the core, and a plurality of ejection pins 54 are arranged corresponding to these cavities.

The movable plate 12 is connected to a mold clamping cylinder or the like to advance and retreat, and the push-out pins 56 project from the plate surface facing the rear surface of the pressing plate 44 to press the rear surface of the pressing plate 44. Since the protruding length of the push-out pin 56 from the surface of the movable platen 12 is usually set to be constant by the molding machine, the stopper
By setting the thickness of 52 appropriately, the pushing plate 44
It is possible to variably set the substantial pushing range of the.

Depending on product design requirements, etc., the ejector pin 54
When it is necessary to increase the protrusion length of the stroke, the stroke length can be made variable by increasing the length of the guide bar 46.

Like the mounting board 20, the support board 30 has a water hole 28 for temperature control.
Is provided.

FIG. 2 is a front view showing a state in which the movable nesting mold 16 is fitted on the support board 30. The movable nesting type 16 is a support board 30 as shown.
Although it is fitted in the fitting hole 32 of, the taper recess 60 is provided on two adjacent sides of the rectangular fitting hole 32 in order to position and fix the support board 30. A wedge body (62) is fitted on the outer wall surface of the holder (40) of the movable nesting mold (16) fitted in the fitting hole (32). The tapered recessed portion 60 is formed such that the inner wall surface of the fitting hole 32 is gradually tapered toward the outer surface of the holder 40 from the mold opening / closing surface toward the inner side, and the wedge body 62 is formed in the fitting hole.
The surface that contacts the inner wall surface of 32 is formed as a tapered surface.

When setting the movable nesting mold 16 on the support board 30, the fitting hole
The movable nesting mold 16 holding the outer side surface of the core 42 by the holder 40 is inserted into the mold 32 from the mold opening / closing direction, the wedge body 62 is fitted and bolted. Taper recess 60
The remaining two surfaces of the fitting hole 32 in which the holes are not formed serve as positioning surfaces, and the outer surfaces of the holder 40 abut on these two surfaces for positioning.

The pushing plate 44 and the guide bar 46 shown in FIG.
Of course, etc. are set in the fitting hole 32 together with the holder 40. The pushing plate 44 is shown in broken lines in FIG. The pushing plate 44 is formed in a substantially H shape as shown in the drawing.

The method of fixing the fixed nesting mold 14 to the mounting board 20 is the same as the method of fixing the movable nesting mold 16 described above, and is a method of inserting a wedge body and tightening it from two sides.

FIG. 3 shows the parting surfaces of the fixed insert mold 14 and the movable insert mold 16. FIG. 3 (a) shows a fixed nested mold 14, third
The figure (b) shows the movable nesting mold 16. 40a is a fixed nesting type 1
The holder 4 and 42a are cores of the fixed nesting type 14. Core 42
A holder 40a is arranged outside the a, and the core 42a is held.

The holders 40 and 40a hold the cores 42 and 42a by coming into contact with the outer surfaces of the cores 42 and 42a. The four assembly pieces formed to match the sides of the cores 42 and 42a are combined to form the core 4
2) Fasten with bolts to the support plate installed on the lower surface of 42a. The core 42 and the holder 40, and the core 42a and the holder 40a form a mold body.

When the molds are closed, the cores 42, 42a are fitted to each other to form a cavity for resin filling. At the same time, the end faces of the holders 40, 40a are also formed so that the end faces of the holders 40, 40a are fitted to each other by projections and depressions.
As described above, at the time of mold clamping, the mounting plate 20 and the supporting plate 30 are positioned by sliding the guide pins 26 into the guide bushes 24.
The fixed nesting mold 14 and the movable nesting mold 16 are positioned relative to each other by fitting the end surfaces of the two to each other. The holder 40 and the holder 40a are fitted with a flange on the end face of the holder 40, 40a.
This is done by projecting 60 and 60a. Flange 60, 60a
Is formed to have a step shape on the inner edge side and the outer edge side of the end surfaces of the holders 40, 40a so that the holders 40, 40a fit together when the mold is closed. As shown in FIG. 1, the flanges 60, 60a are formed so that the surfaces contacting with each other in the mold clamping direction are tapered surfaces so that the clamping force acts on the cores 42, 42a when the molds are clamped.

In the embodiment, the flange 60 provided on the end surface of the holder 40, 40a
And the flange 60a, as shown in FIGS. 3 (a) and (b),
Regarding the sides of the holder 40 in which the fixed nesting mold 14 and the movable nesting mold 16 are provided with two facing flanges 60 and 60a on the inner edge side or both outer edge sides, and the movable nesting mold 16 is provided with the flange 60 on the inner edge side. Is a fixed nested type that fits in this
The flange 40b on the side of the holder 40a of 14 is provided on the outer edge side, and the flange 40 of the movable nesting die 16 is provided on the outer edge side.
The flange 60a on the side of a is provided on the inner edge side.

When the molds are clamped, the mating surfaces of the flanges 60 and 60a are tapered as described above, so that the flanges 60 and 60a can be attached to the core 4
It acts so as to compress between the opposite sides of 2, 42a,
By fitting the 40 and the holder 40a, it is possible to tighten the core 42 from the left and right sides and the core 42a from the upper and lower sides in FIG. In the example,
As shown in FIG. 3, an L-shaped engaging portion 62 is provided at the connecting portion of the adjacent flanges to prevent the flanges 60 and 60a from bending outward during mold clamping, thereby effectively tightening the cores 42 and 42a. I made it work.

As described above, the outer surfaces of the cores 42 and 42a are held by the holders 40 and 40a, and the flanges 60 and 60a that are fitted to each other are provided on the end surfaces of the holders 40 and 40a, so that the conventional guide pins and guide bushes are not used. High precision mold matching is possible.

The cores 42, 42a fitted in the holders 40, 40a are appropriately processed according to the product. FIG. 3B shows an example of the runner 64 and the cavity 66 provided in the core 42. The number of cavities formed in the core 42 is not limited, of course, but in the case of a small product, it is usual to provide a plurality of cavities to improve the manufacturing efficiency. Reference numeral 68 denotes a resin injection hole in the core 42a, but the cores 42 and 42a are different portions depending on the product and are formed in an appropriate shape for each product.

For products that require extremely fine and high precision, the processing of the core 42 becomes extremely complicated.
Does not necessarily consist of a single component. Therefore,
In such a case, the core 42 is composed of a plurality of units, but in the case where it is composed of a plurality of units as described above, the core 42 is first formed at the stage where one cavity can be manufactured in an actual manufacturing operation. It can be assembled and put into production.

In full-scale production, for example, as shown in FIG.
If you want to make two cavities for production, if it takes time to make one cavity,
First, when one cavity is created, the production is started by taking one piece. Then, when the cavity is made, this is incorporated into the core to produce two pieces. is there. This method is suitable when the cavity portion has a complicated shape and cannot be assembled in a short time. In the nested type of this embodiment, the holder
Since 40 and 40a are used as common parts, and the cores 42 and 42a are parts to be manufactured by a product, when the cores 42 and 42a are composed of a plurality of constituent members, a partially completed constituent member is incorporated to form a nested type. It is easily possible to configure.

Incidentally, it is of course possible to attach a plurality of the fixed nest molds 14 and the movable nest molds 16 to the fixed platen 10 and the movable platen 12. Fixed nesting type 1 according to the progress
4, the movable nesting mold 16 can be appropriately attached and used. It is also possible to simultaneously manufacture different kinds of products by attaching different kinds of nested molds.

The operation of the mold apparatus of the embodiment having the above configuration will be described below.

When the movable platen 12 is pushed, the fixed nesting mold 14 and the movable nesting mold 16 are closed, and the cavity is removed from the injection nozzle.
The resin is filled into the inside of the mold 66, the mold is opened, the push-out pin 56 is pushed out, the pushing plate 44 is pushed, the push-out pin 54 is pushed out, and the molded product is released from the mold. When the push-out pin 56 returns, the pushing force of the spring 50 returns the push-motion plate 44 to the original position where it abuts against the stopper 52. Continuous resin molding is performed by repeating these operations.

In the mold apparatus of this embodiment, the outer surfaces of the cores 42 and 42a are attached to the holder 4
Since it is configured to be held in a frame shape by 0, 40a,
If the holders 40, 40a are used as a common standard, the holders 40, 40a can be manufactured by manufacturing only the cores 42, 42a for each product.
a can be used in common. Further, by this, the mounting board 20 and the support board 30 can be commonly used, and the fixed nesting mold 14 and the movable nesting mold 16 can be commonly mounted.

Further, the fixed nesting mold 14 and the movable nesting mold 16 used in this embodiment are cores 42, 42a required for molding the product.
Since the part is the main part of the nesting type, and the holders 40 and 40a are only used for holding the cores 42 and 42a, the fixed nesting type 14 and the movable nesting type 16 have the smallest size possible as a nesting type. Therefore, it can be made more compact than the conventional nested type.

(Effects of the Invention) According to the mold apparatus of the present invention, as described above, the mold body is configured by the core and the holder that abuts and holds the outer surface of the core, thereby simplifying the structure of the nesting mold. Can be converted. In addition, since the flange is provided on the end surface of the holder so that the holder fits when the mold is clamped, the fixed nested mold and the movable nested mold can be accurately positioned without using the guide pin. Further, the nesting die can be formed compactly, and it can be provided as a die device that is easy to handle.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a mold apparatus according to the present invention, FIG. 2 is a front view showing a state in which a movable nesting mold is attached to a support board, and FIGS. 3 (a) and 3 (b) are It is a top view which shows the nesting mold surface of a fixed nesting type and a movable nesting type. 10 …… Fixed board, 12 …… Movable board, 14 …… Fixed nested type, 16
...... Movable nesting type, 20 ...... Mounting board, 26 ...... Guide pin, 30 ...... Support board, 32 ...... Mating hole, 40, 40a ...... Holder, 42, 42a ...... Core, 44 ...... Pushing Plate, 46 ... Guide bar, 50 ... Spring, 52 ... Stopper, 56 ...
Extrusion pin, 60, 60a …… Flange, 64 …… Runner, 6
6 ... cavity.

Claims (1)

[Claims] 1. A mounting plate and a support plate, on which a fixed nesting mold and a movable nesting mold are interchangeably mounted, are fixed to a fixed platen and a movable platen, and a guide pin is provided on a contact surface of the supporting plate with the mounting plate. Along with the provision of a guide bush into which the guide pin slides into the mounting board, it is possible to position the support board and the mounting board, and a mold main body provided in the fixed nesting mold and the movable nesting mold,
It is formed by a core for molding a product and a holder formed in a predetermined standard size that abuts the outer surface of the core to hold the core, and the fixed nest is fitted on the end surface of the holder by concavo-convex fitting when the mold is closed. A mold apparatus which is provided with a flange formed with a tapered surface for positioning the mold and the movable nesting mold with respect to each other and tightening the cores of the fixed nesting mold and the movable nesting mold during mold clamping.