JP2980092B2 - Manufacturing method of simple injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus used for injection molding liquid silicone rubber and other various materials, and more particularly to a method for manufacturing a simple injection molding apparatus.

[0002]

2. Description of the Related Art Molding of silicone rubber molded articles such as a keyboard of a desktop computer, an O-ring, a nipple of a baby bottle, a fitting part of an underwater microphone, and a rubber roll is mainly performed by a press molding method. In the molding method, a hardening agent and a hardening accelerator are kneaded into a millable silicone rubber with a high clay by a two-roller device, etc., and are kneaded into a plate-like material. This is set on a molding die attached to a heating press, clamped, pressed (compressed), heated and vulcanized for a predetermined time, and then opened to obtain a molded product. To remove the molded product from the molding die by blowing air from the molding die.

[0003] In addition to the above-mentioned press molding method, molding of a silicone rubber molded article as described above may be performed using a dedicated injection molding machine.

[0004]

In the above-described press forming method using a heating press machine, almost all operations such as rolling of a material, part setting, setting, and removal of a formed product are performed manually. There is a problem that it cannot be performed unless it is an operation, each operation requires a considerable skill, and the productivity is poor.

[0005] On the other hand, at present, much attention has been paid to automating the molding operation to some extent by injection molding. However, installing a dedicated injection molding machine requires a considerably large capital investment. It is difficult to implement it easily and economically.

[0006] Unlike rubber injection molding, it is difficult to completely automate rubber molding because of its peculiarities such as unstable shape and easy occurrence of burrs. It is known that even if an injection molding machine is used, it will be molded with people, so it is not possible to reduce the cost for introducing an expensive dedicated injection molding machine. Introduction of a dedicated injection molding machine for automation is often avoided. Therefore, there is a need in the art for an injection molding apparatus that is simple, that is, inexpensive.

The present invention has been made in view of the above-mentioned problems in the conventional rubber molding, and has been made without the necessity of an expensive dedicated injection molding machine. It is an object of the present invention to provide a manufacturing method capable of providing a simple injection molding apparatus for easily performing injection molding of a material.

[0008]

SUMMARY OF THE INVENTION According to the first aspect of the present invention, there is provided a stationary mold 7 and a movable mold 21 which are formed on a parting surface of a movable mold 21 according to the present invention. An injection molding device 27 is newly provided in the press device so that the injection nozzle 33 is fitted in the opening of the gate passage 43 thus formed, and the press device for press molding is diverted to a simple injection molding device. Is achieved.

According to the first aspect of the present invention, the simple injection molding apparatus is manufactured by attaching the injection molding apparatus to a press apparatus having a mold clamping apparatus, so that the press apparatus is retrofitted. Therefore, it is not necessary to use a dedicated injection molding machine, and an injection molding apparatus suitable for a rubber molded product or the like can be obtained simply and inexpensively. In addition, the press device manufactured as a simple injection molding device may be a mold clamping device portion of an existing heating press device, or the like, provided that only a mounting portion for mounting the injection molding device is added to the press device. Good.

[0010] Further, since the mold only needs to form the gate passage in the original mold, the injection molding apparatus can be more easily obtained.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of a simple injection molding apparatus manufactured according to the present invention and a press apparatus constituting the main part thereof. In FIG. 1, a press device is indicated by reference numeral 1 as a whole, and the press device 1 uses a press machine for press molding (for example, a press for silicon rubber compression molding).
A fixed-side mounting plate 5 is fixed on the base 3. The fixed-side mounting plate 5 has a fixed-side mold 7 for injection molding.
(Described later) are fixed, and a plurality of tie bars 9 are provided upright.

A movable mounting plate 11 is mounted on the upper end of the tie bar 9 in parallel with the fixed mounting plate 5. A cylinder member 15 of a fluid pressure cylinder device 13 for mold clamping is fixed on the movable side mounting plate 11 by a mounting member 17.
The fluid pressure cylinder device 13 is mounted downward,
The piston rod 19 extends vertically through the movable-side mounting plate 11 and has a movable end mold 2 for injection molding at a tip end.
1 (described later) and is supported in a suspended manner.

The movable mold 21 is provided with the hydraulic cylinder device 1.
3, so-called mold clamping and mold opening are performed.

A bracket 23 for mounting an injection molding device (a so-called unit type) 27 is mounted on a side portion of the base 3 to form a simple injection molding device. The bracket 2 is attached to the substrate 2 of the injection molding device 27 by bolts 25.
9 is fastened and mounted.

The injection molding device 27 has a structure equivalent to that of a screw in-line type injection device. An injection cylinder device 31 having a built-in screw capable of rotating and moving forward and backward is provided. The attached hemispherical injection nozzle 33, the injection material pressurizing and extruding supply unit 35, a forward and backward advancement table 37 that can support and advance these, and a rodless that is connected to the forward and backward advancement table 37 and drives this forward and backward A rod-less pneumatic cylinder device 39 is mounted on the substrate 2 by bolts 41.
9 is fixed.

In this case, the fixed mold 7 and the movable mold 21 provided in the press device 1 are injection molding dies such as a silicone rubber molded product, for example. A gate passage 43 is formed in a parting surface with the mold 21. The gate passage 43 communicates with the cavity 45 on one side, and opens on the mold side wall on the other side, and this opening is a hemispherical recess 47 for receiving the injection nozzle 31 in a fitted state. .

In the illustrated embodiment, the fixed mold 7 and the movable mold 21 are provided with mold temperature adjusting pipes 49 and 51 for injection molding of silicone rubber.

The mounting position of the injection molding device 27 is set on the bracket 23 so that the injection nozzle 33 is fitted into the hemispherical concave portion 47 of the parting surface between the fixed mold 7 and the movable mold 21. The injection nozzle 33 is fitted into the hemispherical concave portion 47 of the fixed mold 7 and the movable mold 21 in the mold-clamped state as shown by the forward movement of the forward and backward movement table 37 by the rodless pneumatic cylinder device 39. I will be.

In this fitted state, an injection material such as silicone rubber is injected into the gate passage 43 from the injection nozzle 33,
This fills the cavity 45. When a predetermined amount of injection material is injected and a predetermined dwell time elapses, the rod-less pneumatic cylinder device 39 retreats the forward-backward movement table 37, thereby disengaging the injection nozzle 33 from engagement with the hemispherical concave portion 47, Then, when a predetermined curing time has elapsed, the movable mold 21 is lifted by the fluid pressure cylinder device 13 and the mold is opened. This completes one molding.

[0021]

[0022]

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various embodiments can be made within the scope of the present invention. Some will be apparent to those skilled in the art.

[0024]

As will be understood from the above description, according to the method for manufacturing a simple injection molding device according to the present invention, the simple injection molding device is mounted as a unit on a press having a mold clamping device. The press machine becomes a retrofit injection molding machine,
This eliminates the need for expensive dedicated injection molding machines, especially for rubber molding by simple modification of existing press equipment, and for the injection molding of other various materials. Workability will be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a simple injection molding apparatus according to the present invention and a press apparatus as a main component thereof.

Claims (1)

(57) [Claims] 1. An injection nozzle 33 is inserted into an opening of a gate passage 43 formed on a parting surface of a fixed die 7 and a movable die 21 provided in a press device for press molding so that an injection nozzle 33 is fitted. A method for manufacturing a simple injection molding apparatus, wherein a molding apparatus 27 is newly provided in the press apparatus, and the press apparatus for press molding is diverted to a simple injection molding apparatus.