JPH05200810A - Injection molding equipment - Google Patents

Abstract

PURPOSE:To obtain an injection molding equipment, in which access to molds can be performed from arbitrary direction. CONSTITUTION:The movable mold part 2 and side mod parts 3 of a mold part, which consists of fixed mold parts 1, a movable part 2 arranged opposite to the fixed mold parts 1 and side mold parts 3 and 3, which integrate with the mold parts 1 and 2 by shifting from their sides, are respectively mounted to driving mechanisms 5 as shifting power system. The driving mechanisms 5 and the fixed mold parts 1 arranged on the same bed 7 of an injection molder 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding device.

[0002]

2. Description of the Related Art Conventionally, a direct pressure type or toggle type has been used as a mold clamping mechanism of an injection molding apparatus. In both cases, the molds attached to the movable plate and the fixed plate are moved and clamped with four pillars called tie bars as tracks. When inserting insert products for insert molding, or when taking out runnerless molded products that require a large number of grips to grip individual molded products, the tie bar interferes with insertion of insert products and runnerless products. When the molded product is taken out, the mold cannot be approached from any direction, and the direction of taking out, the size of the inserted product or the molded product, etc. are limited. For this reason, the number of molds taken, the mold layout,
It will affect the design of the molded product.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an injection molding device which can approach a mold from any direction.

[0004]

The present invention has been made in view of the above points, and is characterized by a fixed mold part, a movable mold part facing the fixed mold part, and these molds. Drive mechanism for moving and integrating the movable mold part and the side mold part of the mold composed of the side mold part that moves from the side to the side part and becomes integral It is in an injection molding device that does not have a tie bar, which has a mechanism and the same mold part.

[0005]

[Function] The mold is moved and clamped by the fixed mold part, the movable mold part facing the fixed mold part, and the side mold part that is integrated with the mold parts by moving from the side surface. The tie bar is not required because the drive mechanism and the pressurizing mechanism of each mold part arranged in the injection molding device are assigned the respective roles. Tie bar and movable plate because the moving power system drive mechanism that moves and integrates the movable mold part and the side mold part and the pressurizing mechanism of the mold clamping power system are equipped with the same mold part. ,
It is possible to move each mold part and clamp the mold without a mechanism composed of a fixing plate. As a result, it becomes possible to approach the mold from any direction when inserting an insert product or when removing a runnerless molded product, and there are restrictions on the removal direction, size of the insert product or molded product, etc. Therefore, the flexibility of mold design and molded product design such as the number of molds to be taken and the layout of molds is improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to these examples.

FIG. 1 is a side view showing a mold open state of a mold of an injection molding apparatus according to an embodiment of the present invention, and a part thereof is a detailed view. The injection-molding die includes a fixed die portion 1, a movable die portion 2 arranged to face the fixed die portion 1, and two side surface die portions which are integrated with each other by moving from these side portions. Three and three
It consists of and. The movable mold parts 2 arranged so as to face the fixed mold part 1 are attached to a drive mechanism (not shown) which is a moving power system, and are arranged one by one on the left and right around the fixed mold part 1. The side mold parts 3 and 3 are attached to a drive mechanism 5 which is a moving power system. These drive mechanisms 5
The fixed mold part 1 is disposed on the same base 7 of the injection molding machine 6.

The side mold parts 3 and 3 rotate 90 ° in the direction of the arrow when the mold is clamped, and the inner walls of the cavities 4 are directed inward toward each other by the moving power system of the actuator 9 and the rod-shaped screw 10 of the drive mechanism 5. The two move forward toward the center of each other, and the movable mold part 2 is also lowered by a similar drive mechanism (not shown) to be combined and integrated. After this integration, the mold clamping is performed by the pressing mechanism 8 of the movable mold part 2 and the side mold part 3.
FIG. 2 is a side view showing the state after performing the mold clamping.

FIG. 3 is a front view and FIG. 4 is a side view showing a drive mechanism of a moving power system for moving the movable mold part 2 and the side mold part 3. The drive mechanism 5 of the moving power system is an actuator 9 and a rod-shaped screw 10, and the mold moves along the rail 10a as a track. Other units such as a hydraulic cylinder unit and an air cylinder unit can be used. Above all, the motor and the rod-shaped screw are preferable in that the positional accuracy can be obtained quickly and the cleanliness of the device is maintained.

After the mold parts are combined and integrated, it is possible to prevent the molds from opening each other even when the next mold clamping force is applied by the mechanical coupling mechanism.
5 and 6 are a front view and a side view of the model case with and without mechanical connection. Since FIG. 5 has the same structure on the left and right, the right part will be described. Cylindrical protrusions 12 are fixedly arranged near the upper and lower ends of the mounting plate 11 of the side surface mold part pressing mechanism 8.
Separately, there is a cutout portion 14 of approximately 1/4 circle in the vicinity of the left and right end portions of the plate 13 to which the pressing mechanism 8 of the movable mold portion is attached,
A cylindrical protrusion 15 is provided which is rotatable about its center. These two columnar protrusions are arranged so as to form concentric circles when the mold parts are combined and integrated. Mounting plate 13 having this cylindrical protrusion 15
The cylindrical protrusion 1 which can be rotated by a gear or disc 17 for transmitting the rotation of the actuator 16 attached to the
It is possible to rotate 5 by 180 degrees to mechanically connect or disconnect. The X state between the movable mold part 2 and the side surface mold part 3 is a mechanically coupled state, and the Y state between the fixed mold part 1 and the side surface mold part 3 is mechanical by using the same mechanism. It is in a state where they are not physically connected. When the side mold part 3 is moved to the right and the mold is opened, a cylindrical protrusion 1 in the X state
No. 2 cannot open the mold because it is obstructed by a higher portion which is not a notch portion of the rotatable columnar protrusion 15. In the Y state, when the side surface mold part 3 is moved to the right, the cylindrical protrusion 1
2 is a cutout portion 1 of a rotatable columnar protrusion 15.
Since it is located at 4, you can move it and open the mold.

As the pressurizing mechanism 8 of the mold clamping power system, in addition to the hydraulic unit 8a composed of the hydraulic cylinder 18, a unit composed of an air cylinder, a motor and a rod-shaped screw can be used. An embodiment in the case of the hydraulic cylinder 18 is shown in FIG. 7 in an enlarged cross-sectional view of a portion A surrounded by the polishing type in FIG. A hydraulic unit 8a is arranged on a mounting plate 13 of a pressurizing mechanism 8 mounted on the lower end of a drive mechanism (not shown) for moving the movable mold part 2. The upper port 19 or the lower port 2 of the cylinder 18 of this hydraulic unit 8a
The ram 21 is moved up and down by adjusting the amount of oil injected from 0, and the movable mold mounting plate 2 is interlocked with the movement of the ram 21.
2 separates from the movable die part pressure mechanism 8 attachment plate 13 and clamps the die. FIG. 7 shows a case where the amount of oil from the upper port 19 is increased and a little pressure is applied for mold clamping.

As a result of the above, movement of the mold by the tie bar,
No mold clamping is required, and the mold can be approached from any direction,
Inserts for insert molding and removal of runner-less moldings can be performed from any location.
In addition, since the mold driving mechanism and the pressurizing mechanism are used separately, the movement of the side mold can be controlled independently with a high degree of freedom regardless of the movement of other molds, and the shape of the molded product can be controlled. It is possible to select the most suitable direction for the movement of the side surface mold part according to.

Further, since the individual die parts are moved by the individual drive mechanisms mounted on the base of the injection molding machine, a small moving power is sufficient. Clamping of the integrated mold can be performed after the integration by operating a pressure mechanism that is a mold clamping power system attached to the movable mold part and the side mold part. In a situation where the mold clamping is balanced with each other inside the mounting plate of each mold part, the mold clamping pressure can be generated with a short stroke movement. Can be tightened. For this reason, distortion is unlikely to occur in the mold, and no gap is formed on the parting surface of the mold, so that the occurrence of flash can be prevented.

It should be noted that, after the above-mentioned integration, before the completion of the mold clamping, a gap in the air flow path is preferably 0.1 to 2 mm.
Sealing means provided at the peripheral edge of these molds so as to ensure a certain degree of clearance, for example, an O-ring, a mold part that is formed by projecting a convex shape with a flexible packing material or spring. A mechanism or the like is used for sealing, and an arbitrary location of this seal is connected to a vacuum device provided outside with a flexible pressure-resistant tube to draw a vacuum. After that, the mold is completely clamped, and the heat-plasticized molding material is injected into the cavity of the molding die to obtain a molded product.

As described above, when the vacuum is drawn before the completion of the mold clamping, and after the completion of the mold clamping, the inside of the cavity of the mold is in a vacuum state, so that the heat-plasticized molding material enters the cavity of the molding mold. Since it enters as if it is drawn in, it can be injected smoothly at low pressure in a short time. As a result, it is possible to prevent defective filling and occurrence of flash.

Examples of the heat plasticized molding material include phenol resin, unsaturated polyester resin, epoxy resin,
A thermosetting resin molding material composed of a melamine resin, a urea resin, a polyimide resin or the like alone, modified, or a mixture can be appropriately selected and used.

[0017]

According to the present invention, the mold can be approached from any direction. For this reason, it is possible to perform the insert device for insert molding, the insert device for taking out the runner-less molded product, and the take-out device for taking out the runnerless molded product.

[Brief description of drawings]

FIG. 1 is a side view showing a mold open state of a mold in an injection molding apparatus of the present invention.

FIG. 2 is a side view showing a mold clamping state of a mold in the injection molding apparatus of the present invention.

FIG. 3 is a front view showing a mold driving mechanism of the injection molding apparatus of the present invention.

FIG. 4 is a side view of FIG.

FIG. 5 is a front view showing mechanical coupling of the mold of the injection molding apparatus of the present invention.

FIG. 6 is a side view of FIG.

7 is a cross-sectional view showing a pressure mechanism of a portion A in FIG.

[Explanation of symbols]

 1 Fixed mold part 2 Movable mold part 3 Side mold part 4 Cavity 5 Driving mechanism 6 Injection molding machine 7 Base 8 Pressurizing mechanism 8a Hydraulic unit 9 Actuator 10 Rod screw 10a Rail 11 Mounting plate 12 Cylindrical protrusion 13 Mounting plate 14 Notched portion 15 Cylindrical protrusion having notched portion 16 Actuator 17 Gear 18 Cylinder 19 Upper port 20 Lower port 21 Ram 22 Movable mold mounting plate

Claims (1)

[Claims] 1. A movable mold of a mold composed of a fixed mold part, a movable mold part facing the fixed mold part, and a side mold part which is integrated with the mold part by moving from a side surface. An injection molding apparatus characterized in that it does not have a tie bar provided in the same mold part with a drive mechanism for moving and integrating these parts into a side mold part and a side mold part and a mold clamping and pressing mechanism for the mold.