JPH07117091A - Material pressure-introducing and heating device in rubber injection machine - Google Patents

Abstract

PURPOSE:To achieve cost reduction by respectively winding high frequency coils around the outer peripheries of both of a melting casing and a nozzle head and introducing a rubber material into an injection machine main body under pressure to subject the same to induction heating. CONSTITUTION:High frequency coils 3a, 3b are provided on the peripheries of both of a melting case 1 and a nozzle head 2 and the melting casing 1 is connected to the nozzle head 2 through a packing 4 made of copper. A ring- shaped groove la is provided in the nozzle head 2 and the melting casing 1 is screwed in an injection machine main body X and the sending hole 1b of a rubber material Y is provided in the melting casing 1. Corresponding to this, the nozzle head 2 is constituted so as to be replaceable with one having the hole fitted to the sending hole 1b of the melting casing and a hole 5 is provided in the nozzle head 2 so as to communicate with the orifice of the nozzle head. Heating and cooling are alternately repeated to prevent the carbonization of the rubber material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material press-fitting heating device for a rubber injection machine.

[0002]

2. Description of the Related Art Conventionally, an injection machine for rubber has used steam (steam) to keep the temperature of rubber as a raw material, keep the rubber material at 60 to 70 ° C., and inject it into a mold at 170 to 19 ° C.
Since it needs to be heated to 0 ° C, it takes too much time to heat the inside of the mold, resulting in poor work efficiency. Conversely, if it is heated too much, the rubber material will become carbonized, which is not desirable. It was

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention was devised to eliminate the above-mentioned drawbacks, in which a high-frequency coil is induction-heated in a short time to heat a rubber material for 2-5 seconds. The temperature of the rubber material is kept at 120-150 ° C, and the temperature difference of the rubber material is kept low by a two-step method.
The object of the present invention is to develop a material press-fitting heating device for a rubber injection machine that can reduce costs by significantly shortening the heating time (170 ° C to 190 ° C) in the rubber material mold and increasing productivity.

[0004]

In order to solve the above problems, the present invention provides a rubber injection machine in which a melting casing and a nozzle head are replaceable, and a high frequency coil is provided around each of the melting casing and the nozzle head. It comprises a material press-fitting heating device in a rubber injection machine, which is characterized in that the main body of the injection machine and the rubber material are press-fitted and heated by induction heating.

[0005]

In use of the present invention, a rubber material heated and softened by a high frequency coil is pushed from a nozzle through a melting casing with a plunger or the like into a mold which is heated and closed in advance. The injection casing body and the inside, that is, the rubber material, is rapidly induction-heated by the high-frequency coil provided in the melting casing and the nozzle head.
By cooling with water, the main body of the injection machine can be kept at 200 ° C and the rubber material can be kept at 130 to 150 ° C.

[0006]

[First Embodiment] A first embodiment of the present invention will be described with reference to the drawings. In a rubber injection machine in which the melting casing (1) and the nozzle head (2) are replaceably provided using bolts (3), the melting casing is High-frequency coils (3a) and (3b) are provided around the (1) and the nozzle head (2), respectively, and a copper packing (4) is used for joining the melting casing (1) and the nozzle head (2). The nozzle head (2) is provided with a ring-shaped groove (1a).

Further, the melting casing (1) is screwed to the main body (X) of the injection machine, and a feed hole (1b) for the rubber material (Y) is provided inside, and the diameter of the hole is 4 to 4. It is 8 mm and is provided at 6 to 12 places, and it is possible to replace it with one that matches the amount of the rubber material depending on the size of the rubber product. Correspondingly, the nozzle head (2) also has a feed hole (1b for the melting casing. It can be replaced with a hole having a hole conforming to the above (1), and a communication hole (5) communicating with the hole (2a) of the nozzle head (2) provided at the tip of the nozzle head (2) is provided.

Inside the melting casing (1) and the nozzle head (2), an inlet (6) for cooling water (Z) is provided from one side, and an outlet (7) is provided to the other side. And these melting casing (1) and nozzle head (2)
Water pools (8) and (9) are formed around the respective areas.

Further, formed on the nozzle head (2),
The plurality of injection holes (10) for injecting the rubber material (Y) have a diameter of about 4 to 8 mm, are provided at 6 to 12 places, and a ceramic coating is applied to these injection holes (10) so that the rubber material In addition to smooth invasion, it is possible to eliminate the residue of the rubber material, and the tip of the nozzle head (2) is subjected to ion nitriding treatment to increase the strength.

The high frequency coils (3a) and (3b) are
A coil having a frequency of 6 to 12 KHz, preferably 8 KHz is used and is provided so as to surround the melting casing (1) and the nozzle head (2), respectively, and the water pools (8) and (9) are connected to the O-ring ( 11) and (12) are connected to each other, and a retainer (13) is provided near the tip of the nozzle head (2).

Further, the copper packing (4) is resistant to heat (heat resistance test 450 ° C.) and pressure (pressure resistance test 200 Kg), and as shown in FIG. 2, there are 3 to 6 places on the tip surface of the melting casing (1). By inserting the marking (M) and connecting the nozzle head (2) with the bolt (3), the nozzle head is brought into contact with the surface, thereby preventing the rubber material (Y) and water from leaking.

[0012]

According to the present invention, the melting casing and the nozzle head are covered with a high frequency coil, and heating and cooling are alternately repeated to carbonize the rubber material. In addition, since the rubber material is heated, the manufacturing time in the mold can be shortened, productivity can be improved, cost can be expected, and labor saving can be achieved. is there.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway sectional view of a melting casing used in the present invention.

FIG. 3 is a side view of a melting casing used in the present invention.

FIG. 4 is a partially cutaway sectional view of a nozzle head used in the present invention.

FIG. 5 is a side view of the nozzle head used in the present invention.

[Explanation of sign]

 1 Melting casing 1a Ring groove 2 Nozzle head 2a Hole 3 Bolt 3a High frequency coil 3b High frequency coil 4 Copper packing 5 Communication hole 6 Inlet 7 Outlet 8 Water pool 9 Water pool 10 Injection hole 11 O-ring 12 O-ring 13 retaining Marking X Injection machine body Y Rubber material Z Water

Claims (1)

[Claims] 1. A rubber injection machine in which a melting casing and a nozzle head are replaceably provided, a high-frequency coil is wound around the outer circumference of the melting casing and the nozzle head, and the material and the main body of the injection machine are induction-heated to form a rubber material. A press-fitting and heating device for raw materials in a rubber injection machine, which is characterized by press-fitting and heating.