JP3037061U - Injection molding probe - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a low-cost and high-efficiency injection molding probe by locally increasing the heat generation efficiency of a chip heater part of a hot runner device for injection molding and suppressing the other parts to be low. SOLUTION: One linear heater 1 is folded back vertically through a shell-shaped probe main body 6 having a conical head portion 4 and a cylindrical body portion 5, and the folded portion is sharpened by the conical head portion 4. Edge 4a
In the injection-molding probe which is arranged facing the inside to form the chip heater portion A, the heater wire 1a of the chip heater portion A of the linear heater 1 is formed of a high resistance material having a large specific resistance, and a heater of the other portion is formed. An injection-molding probe, wherein the wire 1b is formed by joining with a low resistance material having a small specific resistance.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a novel injection molding probe equipped with a high power tip heater.

[0002]

[Prior art]

 For example, a linear heater P for a chip heater shown in FIGS. 4 (a) and 4 (b) is known.

The heater P is entirely formed of a metal or alloy having the same electric resistance. A single linear heater P is folded back at the center, and the folded back portion Q is used as a tip heater for a bullet-shaped probe. It is widely used as it faces the inside of the tip of the conical head.

[0004]

[Problems to be solved by the device]

 However, in such a chip heater structure, since the entire heater is composed of one heating element, unnecessary portions, specifically, other than the sharp end where the tip heater with the conical head is built-in are included. However, there was a problem that the so-called heat generation effect rate was extremely poor because it generated heat at the same high temperature.

This invention focuses on the above points, and keeps the overall resistance value low so that a large amount of heat generation can be obtained locally only in the chip heater portion, and it can be produced at low cost. The object is to obtain a probe for injection molding.

[0006]

[Means for Solving the Problems]

 The present invention can solve the above problems by the following configurations.

(1) One linear heater is folded back vertically in a shell-shaped probe body having a conical head portion and a cylindrical body portion, and the folded portion is inserted into the sharp end of the conical head portion. In the injection molding probe that is placed facing each other to form the chip heater part, the heater wire of the chip heater part of the linear heater is made of a high resistance material having a large specific resistance, and the heater wires of the other parts have a small specific resistance. An injection molding probe, which is formed by joining low resistance materials.

(2) The injection molding probe according to the above (1), wherein the heater wire of the tip heater part is made of Kanthal APM metal and the heater wire of the other part is alumel.

[0009]

[Action]

 The heater wire of the tip heater part exposed inside the sharp end of the conical head of the shell-shaped probe and the heater wire of the other heater part are made of different metals, and the heater wire of the tip heater part has a high resistance. Since the heater wire is made of a material and the other heater wires are made of a material of low resistance, only the tip heater part at the sharp end becomes locally high in temperature during energization to obtain the required temperature. The heaters other than the above do not raise the temperature so much and can maintain a low temperature, so that a local and effective heat effect can be provided, and wasteful power consumption can be adjusted to a minimum.

[0010]

[Embodiment of the invention]

 Hereinafter, an embodiment of the present invention will be described.

FIG. 1 is a vertical sectional side view of an essential part of an injection molding probe, FIG. 2 is a vertical sectional view incorporated in a chip case, and FIGS. 3A and 3B are schematic views showing a manufacturing process for obtaining a chip heater. 4A and 4B are schematic diagrams showing manufacturing steps for obtaining a conventional chip heater, respectively.

Reference numeral 1 denotes a single linear heater, and a KANTHAL APM metal 1a having a large specific resistance is arranged in a central portion, and an aluminum metal 1b having a small specific resistance is integrated at both ends thereof. Connected to each other.

For example, as shown in FIG. 3 (a), one linear heater 1 made of one dissimilar metal as described above is folded back at the central portion as shown in FIG. 3 (b). To form a double structure, whereby the folded portion Q is formed with a double structure of the cantal APM metal 1a having a large specific resistance to form the chip heater wire 2 and its both ends and a nickel alloy having a small specific resistance. The alumel metal 1b becomes the lead wire 3 and is joined.

Insulating treatment T is applied to the overlapping portions so as not to cause a short circuit.

The folded linear heater 1 made of dissimilar metals having the above-described structure is used as a shell-shaped probe having a conical head 4 shown in FIG. 1 and a cylindrical body 5 following the conical head 4. The chip heater portion A can be formed by vertically arranging the tip heater wire 2 in the tube body 6 and fixing and fixing the folded portion Q of the tip heater wire 2 so as to face the sharp end 4a of the conical head 4.

In FIG. 1, the conical head 4 and the cylindrical body 5 of the shell type probe main body 6 are shown integrally, but as shown in FIG. 2 is placed by inserting and inserting the folded-back portion Q in the sharp end 4a of the conical head 4 which is separately formed, and is integrated with another cylindrical body portion 5 by means such as fitting or welding in this state. It can also be made to adhere firmly and configured.

Reference numeral 7 is an insulating material, 8 is a heater for heating the cylindrical body portion 5, and 9 is a joint portion of different metals.

The operation will be described based on the above configuration.

The cannonball type probe body 6 is arranged in a runner portion in the injection molding apparatus, whereby the sharp end 4a of the conical head 4 faces the vicinity of the gate of the cavity and stays in the gate portion. The melting or solidifying action of the material can be controlled by raising or lowering the temperature of the chip heater portion A.

According to the present invention, the high resistance chip heater wire 2 is exposed at the portion corresponding to the chip heater portion A, and the other linear heaters 1 are arranged as the low resistance lead wires 3 and are all arranged. Since the body is formed as one integral dissimilar metal wire, the heat generation amount in the chip heater portion A is large and the heat generation amount in the other portion is small, so that a local effective heat action can be given. .

Table 1 shows the results of comparison between the conventional chip heater and the chip heater of the present invention.

[0022]

[Table 1]

From Table 1 above, it can be seen that the resistance value of the chip heater is remarkably reduced as compared with the conventional one, but the temperature raising time is about 1/2 and the heat generating effect is excellent.

The dissimilar metal is not limited to the one having the above-mentioned configuration, and a metal material of your choice can be used.

[0025]

[Effect of the invention]

 According to this invention, a material having high specific resistance is used for the wire heater corresponding to the chip heater portion where heat generation is required, using a dissimilar metal. Since the material having a low specific resistance is formed as one combined linear heater, an effective heating effect can be obtained, waste can be reduced, and energy can be saved. Moreover, there are many advantages such as shortening the temperature rising time and increasing the molding cycle.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an essential part of an injection molding probe.

FIG. 2 is a vertical sectional view incorporated in a chip case.

3A and 3B are schematic views showing a manufacturing process for obtaining a chip heater.

4A and 4B are schematic views showing a manufacturing process for obtaining a conventional chip heater.

[Explanation of symbols]

 1 Wire heater 1a KANTHAL APM metal 1b Alumel metal 2 Chip heater wire 3 Lead wire 4 Conical head 4a Sharp tip 5 Cylindrical barrel 6 Cannonball type probe body A Chip heater part

Claims (2)

[Utility model registration claims] 1. A single linear heater is folded back vertically in a shell-shaped probe main body having a conical head portion and a cylindrical body portion, and the folded back portion is positioned inside the sharp end of the conical head portion. In the injection molding probe that is placed as a chip heater part in a linear arrangement, the heater wire of the chip heater part of the linear heater is made of a high resistance material having a large specific resistance, and the heater wires of the other parts are made of a low specific resistance. An injection molding probe, which is formed by joining with a resistance material. 2. The injection molding probe according to claim 1, wherein the heater wire of the tip heater part is made of Kanthal APM metal and the heater wire of the other part is made of alumel.