JPH09159539A - Resin surface temperature sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase response speed and accurately measure even a small temperature change for the improvement of the quality of a resin injection molded product and the reduction of a molding time by providing a temperature measuring sensor part on the ends of the projection pin and the inert pin of a resin molding die. SOLUTION: A sensor part made of a temperature measuring thermocouple (d) is provided on the ends (c) of the projection pin (e) and the insert pin (f) of a resin molding die. A compensation lead wire (h) is connected to the sensor part for sending out the output signal thereof to the control device of a molding machine. Also, after a resin molding die is filled with molten resin and this resin is solidified, the projection pin (e) operates to take out a molded product. Furthermore, the sensor part having the thermocouple (d) functions both as a projection pin and a means for directly measuring molten resin temperature, and the length of the projection pin (e) is freely adjustable. Also, the sensor part laid on the end of the insert pin (f) is capable of measuring temperature at the arbitrary position of the molding die, and not restricted by a die structure and a molding shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin temperature sensor which is embedded in a resin molding die and measures the temperature of a molten resin flowing in a cavity of a die.

[0002]

2. Description of the Related Art A conventional example of a surface temperature sensor using a thermocouple embedded in a resin injection molding die is shown in FIGS. 2A, 2B and 2C.
It will be explained by.

FIG. 2 shows an overall view of a resin injection molding die. In FIG. 2A, the molten resin 5 flows in the fixed side 1 of the resin molding die, and a plate thickness 7 capable of maintaining strength at the molding pressure by punching holes on the fixed side of the resin molding die or on the side surface of the movable side mold plate. The hole 4 is left behind, and the thermocouple 3 is inserted into the protective tube 2 in a state in which the thermocouple element is insulated, which is measured by the thermocouple temperature sensor 3 with the stainless steel protective tube 2 therein.

FIG. 2B is an improved version of FIG.
6 is a method in which the temperature is close to that of the molten resin 15 in the cavity, which is covered with a metal having excellent thermal conductivity.

FIG. 2C shows a method of measuring the temperature closer to the molten resin 25 by eliminating the protective tube, which is a further improvement of the above-mentioned FIG. 2B.

[0006]

The configuration of the above-mentioned conventional example has the following problems.

Conventional Example In FIG. 2A, the strength of the molten resin 5 is measured when the side surface of the cavity 1 is drilled to measure the temperature of the molten resin 7.
It is a method of measuring with a protective tube of 2 and a thermocouple of 3 via the thickness of the above, and therefore the actual molten resin temperature is not measured. Furthermore, there is a time delay and a time delay in which the temperature of the molten resin is transferred to the strength holding portion 7, the protective tube 2, and the thermocouple 3.

2B and 2C are measured with the metal insert parts 16 and 26 having excellent thermal conductivity, but the above-mentioned molten resin temperature is not directly measured, and there is a measurement time delay. .

The location of temperature detection is limited by the shape of the resin molded product and the structure of the mold.

[0010]

In order to solve such a problem, the temperature sensor of the present invention is characterized in that a temperature measuring sensor portion is provided at the tip of the protruding pin and the insert pin in the resin molding die. To do.

[0011]

The temperature sensor of the present invention can measure the temperature of the molten resin in the mold at any place by the above-mentioned structure.

The temperature of the molten resin in the mold can be measured by directly contacting the resin.

By directly measuring the temperature of the molten resin as described above, it becomes possible to perform more accurate temperature control than before, and shorten the molding time.
The quality and accuracy of molded products are improved.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which a temperature sensor is mounted on a resin molding die. In FIG. 1, a protruding pin (e) and a nesting pin (f) are shown, and a thermocouple (ni) is provided at the tip (c). ) Sensor part, the compensating lead wire (h) is connected to the control device of the molding machine with the signal from the sensor, and it projects to take out the molded product after the molten resin is filled in the resin molding die and solidified Pin works. The temperature sensor of the present invention is characterized in that it functions as both the role of the projecting pin and the direct measurement of the molten resin temperature, and the length of the projecting pin can be freely changed.

The insert pin temperature sensor has the same performance as the above, and the insert pin temperature sensor has a fixed length, but the insert pin temperature sensor can measure at any place of the mold, and the mold structure, The shape of the molded product is not limited.

FIG. 1A is an enlarged view of the protruding pin temperature sensor, and the details of the protruding pin temperature sensor will be described with reference to the drawing. The heat receiving portion 7 of the Cu—Ni alloy (Constantan) has a large heat receiving effect by being widened to about 50% of the surface area of the protruding pin.

The above Cu-Ni alloy (Constantan) 1
Has a pressure resistant structure against the molding pressure in the mold by increasing the outer diameter of the heat receiving part.

The temperature sensor body 3 and the Cu--Ni alloy (constantan) 1 are fixed by a heat resistant inorganic adhesive material 8.

The protruding pin temperature sensor has a structure in which the length can be freely changed. The auxiliary pipe 4 and the temperature sensor main body 3 are provided.
Is a screw tightening method or is fixed by a pin 9 from the side, and the length of the auxiliary tube 4 can be freely changed.

The insert pin temperature sensor of FIG. 1A has the same performance as the protruding pin temperature sensor, but the insert pin temperature sensor length is fixed, and the insert pin temperature sensor has a structure that can be installed at an arbitrary position of the mold.

[0021]

INDUSTRIAL APPLICABILITY As described above, the present invention can be used also as a part used in a resin molding die for a protruding pin and a nesting pin, and a temperature sensor element can directly contact the resin for measurement, and the response speed is fast and small. Since accurate temperature changes can be accurately measured, the quality of resin injection molded products can be improved and the molding time can be shortened.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a protrusion pin temperature sensor and a nesting pin temperature sensor without implementing the present invention. FIG. 2 is a diagram of a conventional temperature measurement and an enlarged view of the temperature measurement sensor.

[Explanation of symbols]

 Figure 1 b, cavity b, core c, tip d, thermocouple h, projecting pin f, nesting pin, molten resin, compensating lead wire Figure 1 AB 1.11 Cu-Ni alloy (Constantan) 2.12. Insulating ceramic tube 3.13 Temperature sensor body 4 Auxiliary tube (sleeve) 5.15 + pole compensating lead wire 6.16-pole compensating lead wire 7.17 Heat receiving part 8.18 Heat-resistant inorganic welding material 9-pin Fig. 2 ABC 1 11.21 Fixed side (cavity) 2.12.22 Protective tube (sleeve) 3.13.23 Thermocouple 4.14.24 hole 5.15.25 Molten resin 6.16.26 Nesting part 7 Plate thickness 8.18.28 Movable side (core)

Claims (4)

[Claims] 1. An in-mold temperature sensor, characterized in that a temperature measuring sensor is provided at the tip of a protruding pin and a nesting pin of a resin molding die. 2. The iron-constantan thermocouple is provided on the protruding pin and the insert pin. 3. The thermocouple comprises a protruding pin and a nesting pin body F.
e (iron) becomes a positive electrode, and Cu-Ni alloy (constantan) becomes a negative electrode. 4. The protruding pin and the nesting pin Fe (iron) and C
The temperature sensor in a mold according to claim 1, wherein a heat-resistant inorganic adhesive and a u-Ni alloy (Constantan) are fixed.