JPS62127220A - Synthetic resin molding equipment - Google Patents

Abstract

PURPOSE:To efficiently manufacture a variety of workpieces by a method wherein an injection cylinder unit and an injection mold unit, both of which are optimum for the working of workpiece, are selected in accordance with the kind of workproduct so as to be mounted at the tip of a screw type extrusion equipment. CONSTITUTION:Molten resin is forced through the feeder 11b of a screw type extrusion equipment 2 into an injection cylinder 20. When the forcing of the molten resin in the cylinder is finished, the flow of the hydraulic oil supplied to a hydraulic cylinder 23 is changed over by means of an oil pressure selector valve 24 so as to pour the molten resin forced into the injection cylinder 20 under elevated pressure into the mold cavity of an injection mold unit 29. At this time, an oil pressure selector valve 39 is changed over so as to shift a lower mold 33 upwards in order to obtain a desired molded piece. In this case, any proper injection cylinder 20 out of injection cylinders 20 with various capacities is mounted, provided that the outer diameter of the injection cylinder 20 is the same as one another, in order to obtain a desired molded piece. Further, the mold can also be replaced with another mold only be unscrewing bolts 31 and 32 so as to obtain a molded piece with a desired shape.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in synthetic resin molding equipment.

[Conventional technology]

Generally, plastic molding is performed by utilizing the thermoplasticity of the synthetic resin that is the main raw material. Although there are various processing methods depending on the properties of the resin and auxiliary materials, most of them are molding methods that utilize the heat-resistant properties of synthetic resins, that is, thermoplasticity or thermosetting.

Such molding methods include compression molding, transfer molding, injection molding, extrusion molding, blow molding, and calendering.

Among these, thermoplastic molding material is supplied into the cylinder from a supply device, sent to the heating section by a screw provided so as to be rotatable and slidable in the axial direction, and heated and pressurized in the heating section. There is a known molding device that injects the plasticized molding material into the cavity of the mold from a nozzle provided at the tip of the cylinder, and a similar device is also used to inject thermosetting molding material into the mold cavity. It is also used in

The present inventor disclosed a new synthetic resin molding apparatus in Japanese Patent Application No. 59-018488. That is, a thermoplastic molding material is supplied into the cylinder from a supply device, and is sent to the heating section of the cylinder by a rotatably supported screw, and the molding material, which has become plastic after being heated and pressurized, is fed into the cylinder. A screw type extrusion device extrudes from a nozzle installed at the tip of the screw type extrusion device, and the plasticized molding material is received into the cylinder tube from the nozzle of the screw type extrusion device, and a predetermined amount is precisely extruded from the nozzle installed in the cylinder head. It consists of an injection cylinder device for injecting into the body, an upper mold and a lower mold provided with a heating section and a cooling section as necessary, and a device for bringing these upper and lower molds into contact with each other. an injection mold device that molds the molding material into a cavity formed between the upper and lower molds, and a screw extrusion device, an injection cylinder device, and an injection mold device according to a predetermined program. This is a synthetic resin molding device that includes a control device that controls operation.

Therefore, when using the above synthetic resin molding apparatus, the amount of injected plastic can be precisely controlled, and each driving device and heating device can be automated, so that the device can be operated at the most favorable timing. It has become possible to mold large, complex-shaped molded products in the best possible condition.

However, in the above-mentioned synthetic resin molding apparatus, the screw type extrusion apparatus and the injection cylinder apparatus are completely combined, so when the mold is replaced, the injection cylinder apparatus is appropriately replaced with the one most suitable for the processing. Therefore, it is quite time-consuming and troublesome to perform injection molding of different types of synthetic resins with one synthetic resin molding device, or to perform suitable injection molding under different changing conditions such as dimensions and shapes. , there was a problem that it was practically difficult.

Further, with this conventional device, there was a problem in that the mold could not be quickly replaced, and that it took time to install, preheat, etc.

[Problems to be solved by the present invention]

The present invention has been developed from the viewpoint of cooking, and its purpose is to adjust the injection cylinder device to suit the processing, depending on the material of the resin, the size and shape of the molded product, etc. It is an object of the present invention to provide a new synthetic resin molding device that can be exchanged and processed, and can also easily exchange molds and perform preheating.

[Means for solving problems]

Therefore, in order to achieve the above object, in the synthetic resin molding apparatus disclosed by the present inventor, an injection cylinder mounting surface and an injection molding mold apparatus are respectively detachably attached to the tip of the screw type extrusion apparatus. Attachment is achieved by providing a mounting seat and preparing a large number of types of the injection cylinder device and injection mold device in a form that allows them to be easily attached to and removed from the mounting seat.

(Function) If configured as described above, the screw type extrusion device, injection cylinder device, or injection mold device can be suitably optimized for the processing depending on the processing size, processing shape, etc. Since the molded parts can be processed while being replaced with other parts, the synthetic resin molding process can be carried out efficiently, and since the yield rate is also improved, the cost of molded products can be kept low.

〔Example〕

Hereinafter, details of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory view showing one embodiment of the synthetic resin molding apparatus according to the present invention, and FIGS. 2 and 3 are explanatory views showing other embodiments of the injection cylinder apparatus, respectively.

In Fig. 1, 1 is a synthetic resin molding device, 2 is a screw type extrusion device, 3 is a cylinder, 4 is a screw, 5 is a flange to which the cylinder 3 is attached, and 6 is a column in which a reduction gear is housed. , 7 is a motor, 8 is a material supply device,
Reference numeral 9 denotes a replenisher mounting member that supports the material replenisher 8, and 10
11 is a mounting seat provided at the tip of the screw type extrusion device 2; 12 is a breaker plate; 13 is a wire mesh; 14 to 18;
is an inductor (excitation coil for high-frequency induction heating), 19 is an injection cylinder device, 20 is an injection cylinder, 21 is a piston,
n is a rod, 返 is a hydraulic cylinder, U is a hydraulic switching valve that switches the flow of hydraulic pressure to the above-mentioned hydraulic cylinder, and δ is an injection fixed to the above-mentioned mounting seat 11 and fitted into the injection cylinder storage hole 11a of the mounting seat 11. A piston-type lock device that presses and fixes the cylinder device 19; 26 is a support member; r is a rod; 28 is a hydraulic switching valve that switches the flow of hydraulic pressure to the piston-type lock device; 4 is an injection mold device , 30 is an upper mold that is attached to the mounting seat 11 via bolts 31 and 32, the wing is a lower mold, 34 is a movable base, 35 and 36 are fixed at one end to the movable base 34, and the other end is an upper mold. A guide rod is inserted into the positioning hole of No. 30 and slidably guides the lower die, and a hydraulic cylinder that supports the lower die wing so as to be movable up and down. Hydraulic switching valve that switches the flow of hydraulic pressure, 4
0 is a hydraulic pump, and 41 is an oil tank.

In addition, in FIGS. 2 and 3, 19' and 19'' respectively indicate other embodiments of the injection cylinder device, and 4
2 and 4 are injection cylinders, 44 and 45 are hydraulic cylinders, 46 and 47 are rods, and 48 and 49 are pistons.

A part of the cylinder 3 of the screw type extrusion device 2 is supported via a flange 5 by a column 6 in which a deceleration device is housed, and its tip is supported by a column lO, and a mounting seat is provided at the tip. 11 are provided.

The mounting seat 11 has a flat disk-like or rectangular disk-like outer shape, and an injection cylinder storage hole 11a into which the injection cylinder device 19 is slidably fitted is formed in the center thereof. A piston-type locking device section for fixing the injection cylinder device 19 is provided at a position opposite to the screw-type extrusion device 2 across the injection cylinder storage hole 11a, and the lower surface of the mounting seat 11 is provided with a locking device for injection molding. It is a mold mounting seat that allows the upper mold (capital) to be mounted freely.

Further, inductors 14 to 18 are provided on the outer peripheral surface of the cylinder 3 at appropriate intervals, and an alternating current is supplied from a power supply device (not shown) to heat the cylinder 3 by induction heating. Although not shown in the drawings, the cylinder 3 is provided with a temperature detector and a pressure detector at appropriate intervals, and the temperature and pressure of the molding material at each position of the cylinder 3 are constantly detected.

The screw 4 is rotatably provided in the cylinder 3 coaxially with the cylinder 3, and is connected to the output shaft of a speed reduction device housed in a column 6 that decelerates the rotation of the motor 7 and increases the torque. Rotated by 7, material supply device 8
The molding material supplied into the cylinder 3 is pressurized and heated, and further heated by induction heating in the heating section, and the molding material that has become plastic is transferred to the injection cylinder 2 of the injection cylinder device 19.
This is to push it within 0.

The output of a power supply device (not shown) that supplies electric power to the motor 7 is controlled by a control device (not shown), which controls the starting, stopping, rotation speed, etc. of the motor 7.

A breaker plate 12 having a large number of holes and a wire mesh 13 held by the breaker plate 12 are provided between the tip of the cylinder 3 and the mounting seat 11. This makes the flow of the molding material uniform and the material Thoroughly knead the mixture to ensure uniform heating and apply pressure inside the cylinder 3.

When the injection cylinder 20 is fitted into the injection cylinder storage hole 11a of the mounting seat 11, the hydraulic switching valve n is switched, and the injection cylinder 20 is attached to one end of the rod n of the piston locking device 5. The support member 4 is strongly pressed and fixed against the inner wall surface of the injection cylinder housing hole 11a of the mounting seat 11.

A molding material that has been heated, pressurized, and kneaded by the screw extrusion device 2 is fed into the injection cylinder 20 through the supply path 11b of the mounting seat 11. Further, the position of the piston within the injection cylinder 20 is controlled by a hydraulic switching valve 24.

The upper mold 30 part of the injection mold device hole is the mounting seat 11.
It is fixed by a bolt 31 and a hood. On the other hand, lower mold 3
3 is attached to the loft 38 of each hydraulic cylinder, and is slidably guided by a guide loft and 36 whose one end is fixed to the movable table 34 and whose other end is inserted into the positioning hole of the upper mold 30. Its position and vertical movement are controlled by a hydraulic switching valve.

Although omitted in the drawing, the above-mentioned upper mold 30 and lower mold 33
A heating coil is provided inside the mold cavity, so that the upper and lower molds 30 and 33 are heated during processing, and the molten molding material is evenly distributed inside the mold cavity.

When processing is performed using the synthetic resin molding apparatus according to the present invention, first, the injection molding mold apparatus 29 is
After attaching the upper mold 30 and lower mold necessary for molding the desired workpiece to the machine, installing them in a predetermined position, and fixing the upper mold 30 to the mounting seat 11 with bolts 31 and 32, The injection cylinder device 19 is selected depending on the size and shape of the workpiece, and the tip of the injection cylinder 20 is fitted into the injection cylinder storage hole 11a of the mounting seat 11. In this case, the flow of hydraulic pressure supplied to the piston-type locking device 5 is switched by the hydraulic switching valve 28, and the injection cylinder 20 is controlled to eject the mounting seat 11 by a support member attached to the loft of the piston-type locking device. It is fixed in the cylinder storage hole 11a.

When each device is selected and securely fixed to the mounting seat 11 as described above, granular or powdered molding material is supplied from the material supply device 8 into the cylinder 3. Along with this, the screw 4 is rotated by the drive of the motor 7,
The molding material is sent to the heating section of the cylinder 3, where it is heated, pressurized and melted, and is further transferred to the breaker plate 12 provided at the tip of the cylinder 3 and the gold plate held therein.
13, and then press-fitted into the injection cylinder 20 via the supply path 11b provided in the mounting seat 11, and at the same time, the piston 21 is pulled upward.

When a predetermined amount of molding material is press-fitted into the injection cylinder 20, the flow of hydraulic pressure supplied from the hydraulic pump 40 to the hydraulic cylinder cylinder is switched by the hydraulic switching valve 24, and the molding material injected into the injection cylinder 20 is transferred to the injection cylinder 20. It is injected at high pressure so that it is evenly distributed inside the mold cavity, and then
The hydraulic switching valve 39 is switched to move the lower die upward, thereby obtaining a desired molded product.

As shown in FIGS. 2 and 3, the injection cylinders 42 and 43 of the injection cylinder device fitted into the injection cylinder storage hole 11a of the mounting seat 11 have the same outer circumferential diameter. , a large number of cylinders with different inner diameters and strokes are prepared, and the injection cylinder with the optimal shape capacity and shape is selected according to the purpose of processing, etc., and, for example, injection molding is performed using the same volume of molding material. Even when processing is performed, an appropriate cylinder is selected depending on the type of resin, required processing mechanism, etc., and processing is performed.

In addition, for the injection mold device hole, attach the upper mold 30 part to the bolt 3.
1 and a support to the mold mounting seat on the lower surface of the mounting seat 11, the upper mold 30 can be easily removed from the mounting seat 11 by simply loosening the bolts 31 and wings. Since each component of the injection mold device hole is mounted on a movable table 34 provided with wheels, the movable table 34 can be moved and easily replaced with another injection mold device. I can do it.

〔Effect of the invention〕

Since the present invention is configured like a cooking machine, when using the present invention, depending on the size and shape of the process, the injection cylinder device can be replaced with the one most suitable for the process. Therefore, the synthetic resin molding process can be carried out efficiently, and since the yield rate is improved, the cost of the molded product can be kept low.

Note that the present invention is not limited to the cooking example. That is, for example, in this embodiment, the injection cylinder device 1
9 is fitted into the injection cylinder storage hole 11a of the mounting seat 11, and is fixed by pressing with a support member 26 provided at the tip of the loft 27 of the piston type locking device 5. The hydraulic cylinder 23.37, the loft 22.38, and the hydraulic switching valve 24
．． It is recommended that the upper and lower molds 30 and the injection cylinder 20 be equipped with a heating device, a temperature control device, etc. Furthermore, the shape of the mounting seat 11 of the screw type extrusion device 2, the method of mounting the injection mold device to the mounting seat 11, the method of fixing it, the style, configuration, and control method of other parts are described in this book. The design can be freely changed within the scope of the purpose of the invention, and the present invention encompasses all of them.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing one embodiment of the synthetic resin molding apparatus according to the present invention, and FIGS. 2 and 3 are explanatory views showing other embodiments of the injection cylinder apparatus, respectively.

Claims (1)

[Claims] Supplying thermoplastic molding material into the cylinder from a supply device,
A screw-type extrusion device that sends the molding material to the heating section of the cylinder using a rotatably supported screw, and extrudes the molding material that has become plastic through heating and pressurization from a nozzle provided at the tip of the cylinder; an injection cylinder device that receives plasticized molding material from a nozzle of a type extrusion device into a cylinder tube and injects it as a precisely controlled predetermined amount from a nozzle provided in a cylinder head; It consists of an upper mold and a lower mold each having a cooling section, and a device for bringing the upper and lower molds into contact with and separating them, and the molding material, which has become plastic, is passed from the nozzle of the injection cylinder device into the cavity formed between the upper and lower molds. In a synthetic resin molding device consisting of an injection molding device for molding, and a control device for controlling the operations of the screw type extrusion device, injection cylinder device, and injection molding device according to a predetermined program. . The synthetic resin molding device as described above, wherein a mounting seat is provided at the tip of the screw type extrusion device to which an injection cylinder device and an injection mold device can be detachably attached.