JP3073288B2 - Resin surface temperature sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional example of a resin surface temperature sensor embedded in a resin injection mold will be described with reference to FIGS.

In FIG. 2, a molten resin 2 flows in a cavity 1 of a resin injection mold, and the strength of a cavity-side surface portion of the insert 5 is inserted into a fixed side or a movable side insert 5 of the resin injection mold. A hole 7 drilled from the side opposite to the cavity 1 except for a distance 6 necessary for holding is provided. The collar 7 has an outer shape substantially equal to the inner shape of the hole 7, and the temperature sensor 3 is fitted at the tip. 4 is inserted. This color 4 is
When it is difficult to directly drill an extremely thin hole into the nest 5 into which the temperature sensor 3 is fitted, a relatively large hole is used in the nest 5 for use.

FIG. 3 shows a case where the shape of the nest 5 in FIG. 2 is such that an extremely thin hole 8 into which the temperature sensor 3 is fitted can be directly formed in the nest 5. An extremely thin hole 8 into which the temperature sensor 3 is inserted is drilled at the tip of a hole 7 drilled from the side opposite to the cavity 1 except for a distance 6 necessary for maintaining strength.

[0005]

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

In the conventional example of FIG. 2, the temperature of the molten resin 2 is
Since the temperature is measured by the temperature sensor 3 via the distance 6 necessary for maintaining the strength of the surface of the nest 5 on the cavity 1 side, the actual temperature of the molten resin 2 cannot be measured due to the temperature of the nest 5. Further, there is a problem that the follow-up of the temperature measurement result with respect to the temperature change of the molten resin 2 is delayed. Further, since the temperature sensor 3 and the nest 5 are only in point contact with the tip of the temperature sensor 3, there is a problem that it is difficult to improve the measurement accuracy.

In the conventional example of FIG. 3, similar to the case of FIG.
Since the temperature is measured by the temperature sensor 3 through the distance 6 necessary for maintaining the strength of the surface of the nest 5 on the cavity 1 side, the actual temperature of the molten resin 2 cannot be measured due to the influence of the temperature of the nest 5, Further, there is a problem that the follow-up of the temperature measurement result with respect to the temperature change of the molten resin 2 is delayed. Further, since the temperature sensor 3 and the nest 5 are in surface contact with each other at the tip of the temperature sensor 3, the difficulty in improving the measurement accuracy is slightly alleviated. In order to drill the small hole 8 with the required processing accuracy, not only a special processing machine is required, but even if the small hole 8 is formed, the tip of the temperature sensor 3 is inserted from the back side of the nest 5 into the small hole. However, there is a problem that it takes a long time to fit into the sleeve 8 and it is not easy.

[0008]

In order to solve the above-mentioned problems, a resin surface temperature sensor according to the present invention is designed to measure the temperature of a molten resin flowing in a cavity of a resin injection mold. In the resin surface temperature sensor mounted so that the tip is located slightly inside from the cavity side surface of the fixed side or movable side insert of the mold, the tip of the temperature sensor is a metal with better thermal conductivity than the metal constituting the mold. The tip of the temperature sensor is located slightly inside from the cavity-side surface of the nest, and the metal part covering the tip of the temperature sensor forms a part of the cavity-side surface of the nest. It is characterized by the following.

Further, in order to solve the above-mentioned problems, the resin surface temperature sensor of the present invention makes the tip position of the temperature sensor substantially coincide with the cavity side surface of the fixed side or movable side insert of the resin injection molding die. Is preferred.

In order to solve the above-mentioned problems, the resin surface temperature sensor of the present invention has a metal part having excellent thermal conductivity covering the tip of the temperature sensor. It is preferable that the shape is such that it is inserted from the cavity surface side of the fixed side or the movable side insert of the injection mold.

[0011]

According to the resin surface temperature sensor of the present invention, the tip of the temperature sensor is covered with a metal having higher thermal conductivity than the metal constituting the mold, and the tip of the temperature sensor is fixed on the fixed side of the resin injection mold. Alternatively, a part of the surface of the metal part having excellent thermal conductivity covering the tip of the temperature sensor may be positioned slightly inside the cavity side surface of the movable side nest, and may be fixed or movable side nest of the resin injection mold. Because a part of the surface on the cavity side is formed, a temperature close to the actual temperature of the molten resin can be measured, and the followability of the temperature measurement result to the temperature change of the molten resin is improved. In addition, since the temperature sensor and the metal having excellent thermal conductivity are in surface contact, measurement accuracy is improved.

In the resin surface temperature sensor of the present invention, when the position of the tip of the temperature sensor substantially coincides with the cavity side surface of the fixed or movable nest of the resin injection mold, the actual temperature of the molten resin is reduced. Can be measured, and the followability of the temperature measurement result to the temperature change of the molten resin is further improved.

Further, the resin surface temperature sensor of the present invention comprises a metal part having excellent thermal conductivity covering the tip of the temperature sensor.
If the outer shape is made larger toward the tip, inevitably,
The resin surface temperature sensor is fitted from the cavity side surface to the fixed side or the movable side nest of the resin injection mold, and the fitting operation becomes easy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the resin surface temperature sensor of the present invention will be described with reference to FIG.

In this embodiment shown in FIG. 1, a molten resin 2 flows in a cavity 1 of a resin injection molding die, and a temperature sensor 3 and a temperature sensor 3 are provided in a fixed or movable side insert 5 of the resin injection molding die. A hole 7 through which a lead wire can be easily inserted is provided, and the tip of the temperature sensor 3 is covered with an aluminum-based alloy or a copper-based alloy, which is a metal having higher thermal conductivity than the metal constituting the mold, so that the outer diameter is reduced. A metal portion 10 having an excellent thermal conductivity larger than the inner diameter of the hole 7 is formed, and a fitting hole 9 is formed above the hole 7 so that the metal portion 10 can be just fitted. From the direction of 11, the temperature sensor 3 having the metal part 10 is inserted into the fitting hole 9 and the hole 7 from the lead wire side, and the metal part 10 is fitted into the fitting hole 9. After this fitting, the metal part 10 is processed so that the metal part 10 forms a part of the cavity side surface of the fixed or movable side insert 5 of the resin injection mold.

The operation of the embodiment shown in FIG. 1 will be described.

When the molten resin 2 flows through the cavity 1 of the resin injection molding die, the molten resin 2 comes into contact with the surface of the metal part 10 forming a part of the surface of the cavity 1 and the temperature of the molten resin 2 is increased. Is measured by the temperature sensor 3 via the metal part 10. The measured temperature value is affected by the size of the metal part 10, but due to the excellent thermal conductivity of the metal part 10 and the fact that the molten resin 2 is in surface contact with the metal part 10. In addition, the measurement accuracy is improved, the followability to the temperature change of the molten resin 2 is improved, and a temperature close to the actual temperature of the molten resin 2 can be measured.

Further, in this embodiment, since the hole with high precision drilled in the nest 5 is a fitting hole 9 machined from the surface of the nest 5, it is not necessary to use a special machine as in the conventional example. Can be easily processed. Since the temperature sensor is also inserted from the surface of the nest 5, the insertion is easy.

The resin surface temperature sensor according to the present invention is not limited to the above-described embodiment, and various modes are possible. For example, since the resin surface temperature sensor of the present invention has good workability, it is easy to make the tip position of the temperature sensor substantially coincide with the cavity side surface of the fixed or movable side insert 5 of the resin injection mold. Can be. In this way, the accuracy of temperature measurement and the ability to follow the temperature change of the molten resin 2 are significantly improved, and the actual temperature of the molten resin 2 can be measured.

[0020]

According to the resin surface temperature sensor of the present invention, a metal part 10 is formed by covering the tip of the temperature sensor 3 with a metal having good heat conductivity, and the surface of the metal part 10 is formed on the surface of the nest 5 on the cavity side. Since the metal part 10 is processed so as to form a part and the metal part 10 is brought into direct contact with the molten resin 2, the temperature measurement accuracy of the temperature sensor 3 is improved, and the molten resin 2 can follow the temperature change. This has the effect of improving the performance.

The resin surface temperature sensor of the present invention is inserted into the nest 5 from the cavity side surface of the nest 5,
Since it has a structure in which the fitting hole 9 is fitted and the workability of the fitting hole 9 and the above-described insertability are good, the position adjustment of the tip of the temperature sensor 3 is easy, and the tip of the temperature sensor 3 is nested. The surface of the cavity can be made to substantially coincide with the surface on the cavity side, and the measurement accuracy and followability of the temperature can be extremely improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a sectional view of a first conventional example.

FIG. 3 is a sectional view of a second conventional example.

[Explanation of symbols]

 Reference Signs List 1 cavity 2 molten resin 3 temperature sensor 5 nest 7 hole 9 fitting hole 10 metal part

Continued on the front page (58) Investigated field (Int. Cl. ⁷ , DB name) B29C 45/78 B29C 45 / 37,45 / 73 B29C 33/38-33/42 G01K 1/14-1/16

Claims (3)

(57) [Claims] In order to measure the temperature of a molten resin flowing in a cavity of a resin injection molding die, a tip is positioned slightly inside a cavity side surface of a fixed side or a movable side insert of the resin injection molding die. In the resin surface temperature sensor attached to, the tip of the temperature sensor is covered with a metal having better thermal conductivity than the metal constituting the mold, and the tip of the temperature sensor is located slightly inside from the cavity side surface of the nest, The resin surface temperature sensor, wherein the metal portion covering the tip of the temperature sensor forms a part of the cavity-side surface of the nest. 2. The resin surface temperature sensor according to claim 1, wherein the position of the tip of the temperature sensor substantially coincides with the cavity side surface of the fixed side or movable side insert of the resin injection mold. 3. The metal part having excellent thermal conductivity covering the front end of the temperature sensor has an outer shape that increases toward the front end, and is inserted from the fixed side of the resin injection mold or the cavity surface side of the movable side insert. The resin surface temperature sensor according to claim 1, wherein the sensor has a shape.