JPH05209794A - Molten metal temperature measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a molten metal temperature measuring device capable of directly measuring the temperature of a molten metal without making a hole in a product or considering a releasing direction. [Structure] A cylindrical holder 3, a protective cover 7 arranged in the holder 3, and wires 10 and 11 of a thermocouple temperature sensor 9 arranged in the protective cover 7 are configured.
Each of the tip surfaces of the holder 3 and the protective cover 7 has a casting mold 1
It is arranged flush with the cavity mold surface 2a.
The protective cover 7 is provided with a heat-insulating air layer 6, and the tip portion is fitted and held in the holder 3. Further, the wires 10 and 11 of the thermocouple temperature sensor 9 are embedded in the protective cover 7 with the electrical insulating material 8 and the measurement points 12 arranged inside the tip surface of the protective cover 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal temperature measuring device for measuring the temperature of molten metal such as aluminum injected into a casting mold by using a thermocouple temperature sensor.

[0002]

2. Description of the Related Art Conventionally, there have been the following two devices for measuring the temperature of molten metal such as aluminum poured into a casting mold.
A variety of things are known.

First, the first device, as shown in FIG.
The thermocouple temperature sensor S is embedded in the casting mold 1 (see Japanese Utility Model Laid-Open No. 55-33663). In addition,
C is a protective cover in which the thermocouple temperature sensor S is embedded by filling the inside with an electrical insulating material such as magnesium oxide.

The second device, as shown in FIG.
In the casting mold 1, the thermocouple temperature sensor S is embedded in the casting mold 1 so that the tip of the thermocouple temperature sensor S covered with the protective cover C is projected into the cavity (actually). (See Japanese Laid-Open Patent Publication No. 56-126538).

[0005]

However, in the first conventional apparatus, the temperature measured by the thermocouple temperature sensor S is actually not the temperature of the molten metal M but the temperature of the mold 1 itself. When the directional solidification is carried out according to the setting by replenishing the liquid, the temperature control becomes inaccurate.

Further, although the molten metal M can be directly measured in the second apparatus, the protective cover C is applied to the product at the time of casting.
Therefore, the arrangement position of the protective cover C needs to be taken into consideration so that a hole is not formed in the product and the protective cover C does not get in the way at the time of releasing from the product, which is not versatile.

The present invention is intended to solve the above-mentioned problems, and it is possible to directly measure the temperature of the molten metal without making holes in the product and without considering the direction of mold release. An object is to provide a measuring device.

[0008]

A first molten metal temperature measuring device according to the present invention is a molten metal temperature measuring device for measuring the temperature of molten metal injected into a casting mold by utilizing a thermocouple temperature sensor. At least, a cylindrical holder that is embedded and fixed in the casting mold, and has a tip surface that is flush with the cavity mold surface,
The tip end surface is disposed in the holder and is flush with the tip end surface of the holder, and an adiabatic air layer is provided between the tip end surface and the holder inner peripheral surface to hold the tip on the holder tip inner peripheral surface. A protective cover, and an electric insulating material filled in the protective cover and embedded therein, and a wire of the thermocouple temperature sensor in which a measuring point is arranged inside a tip surface of the protective cover. It is characterized by

A second molten metal temperature measuring device according to the present invention is
Further, the wall thickness of the tip surface of the protective cover is 0.4 to 1.
The distance between the measurement point of the wire of the thermocouple temperature sensor filled with the electrical insulating material and the inside of the tip surface of the protective cover is 0.3 to 1.0 mm.

[0010]

In the first molten metal temperature measuring device according to the present invention, the tip end surfaces of the holder and the protective cover that covers the thermocouple temperature sensor are flush with the cavity die surface of the casting die. Placed in one. Therefore, unlike the conventional case, the protective cover and the like do not project into the cavity of the casting mold, and a hole is not formed in the product. Further, it is not necessary to consider the release direction of the product.

Furthermore, the tip end portion of the protective cover is held by the holder in a state where an adiabatic air layer is provided between the protective cover and the inner circumferential surface of the holder, and the tip surface of the tip end surface which is flush with the cavity die surface of the protective cover. With the measurement points placed inside,
The wires of the thermocouple temperature sensor are arranged in a protective cover filled with an electrical insulating material. Therefore, the measurement point of the thermocouple temperature sensor does not measure the temperature of the casting mold,
The temperature of the molten metal itself can be measured.

Therefore, in the first molten metal temperature measuring apparatus according to the present invention, the molten metal temperature can be directly measured without making holes in the product and without considering the direction of mold release. it can.

In addition, in the molten metal temperature measuring apparatus of the second embodiment according to the present invention, the thermoelectrically-charged thermo-electric charging device is further provided in which the thickness of the tip end surface of the protective cover is 0.4 to 1.0 mm and the electrical insulating material is filled. The distance between the measurement point of the temperature sensor and the inside of the tip surface of the protective cover is set within the range of 0.3 to 1.0 mm, and the durability can be improved while keeping the response time of temperature measurement short.
And it can be easily manufactured. By the way, if the thickness of the tip surface of the protective cover exceeds 1.0 mm, the response time for temperature measurement will be long, and if it is less than 0.4 mm, it will be difficult to manufacture the protective cover and the durability of the protective cover will increase. It reduces the sex. Further, if the distance between the measurement point of the wire of the thermocouple temperature sensor filled with the electric insulating material and the inside of the tip end surface of the protective cover exceeds 1.0 mm, the response time of the temperature measurement will be long, If the thickness is less than 0.3 mm, it is necessary to manufacture the thermocouple temperature sensor so that the measurement points of the wires do not come into contact with the protective cover to conduct electricity, which makes the manufacture of the device difficult.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the molten metal temperature measuring apparatus of the embodiment is arranged in a split mold 2 of a casting mold 1, and has a holder 3, a protective cover 7, and a thermocouple temperature sensor 9.
And are provided.

The split mold 2 is made of steel and is provided with a predetermined cavity mold surface 2a so that a predetermined casting can be cast with a split mold (not shown) when the casting mold 1 is clamped.
In addition, 2b is an insertion hole for inserting a cylinder portion 4 of the holder 3 described later, 2c is an insertion hole for inserting the flange portion 5 of the holder 3, and 2d is a bolt 13 described later. It is a screw hole that is screwed.

The holder 3 is made of steel and has a cylindrical tubular portion 4
And an annular flange portion 5 formed on the base side of the tubular portion 4.
And are provided. A predetermined number (four in the embodiment) of mounting holes 5a are formed in the flange portion 5.
These mounting holes 5a are formed by connecting the holder 3 to the split mold 2 and the bolts 13
It is used when stopping. Tip surface 4a of the cylindrical portion 4
Is formed so that when the holder 3 is fixed to the split mold 2 with the bolts 13, the holder 3 is flush with the cavity mold surface 2a of the split mold 2. In addition, the holding portion 4 having a narrow inner diameter is fitted to the inner circumference of the tip of the tubular portion 4 so that the tip of the protective cover 7 can be fitted and held.
b is formed. The axial length L of the holding portion 4b is 3.0 mm in the case of the embodiment.

The protective cover 7 is made of steel and is formed into a bottomed cylindrical shape having a bottom portion on the tip side. When the tip is fitted and held in the holding portion 4b of the holder tubular portion 4,
The front end surface 7a is formed into a flat surface that is flush with the front end surface 4a of the tubular portion 4. In addition, the protective cover 7 holds
When fitted and held in b, a gap is formed between the inner peripheral surface of the tubular portion 4 and the outer peripheral surface of the protective cover 7, so that the gap forms the heat insulating air layer 6, The outer diameter is specified. In addition, 7b is formed on the protective cover 7,
A flange portion that closes the heat insulating air layer 6, and is a flange portion 7b.
Is fixed to the holder 3 by using welding or caulking.

The protective cover 7 has a tip surface 7a.
Is formed within the range of 0.4 to 1.0 mm.

The thermocouple temperature sensor 9 comprises two kinds of predetermined wires 10 and 11, and the mutual wires 10 and 11 are arranged.
The measurement point 12 which is the junction point of the
It is arranged inside a. An electrical insulating material 8 such as magnesium oxide is filled between the protective cover 7 and the protective cover 7. The other end of each of the wires 10 and 11 is connected to a predetermined measuring instrument via a compensating lead wire, a reference contact, etc., which are not shown.

The distance t1 between the measuring point 12 and the inside of the tip surface 7a of the protective cover 7 filled with the electric insulating material 8 is
Is set within the range of 0.3 to 1.0 mm.

The holder 3, the protective cover 7, and the wires 10 and 11 of the thermocouple temperature sensor 9 are integrated in advance.

For this reason, the molten metal temperature measuring apparatus of the embodiment is assembled to the split mold 2 by the cylindrical portion 4 and the flange portion 5 of the holder 3.
Insert the and into the insertion holes 2c and 2d of the split mold 2, and insert the flange 5
Bolt 1 using the mounting hole 5a of 2 and the screw hole 2d of split mold 2
If stopped, the assembling work can be completed.

In the molten metal temperature measuring apparatus of the embodiment, after being assembled to the split mold 2, the protective cover 7 covering the cylindrical portion 4 of the holder 3 and the wires 10 and 11 of the thermocouple temperature sensor 9 is provided.
The front end surfaces 4a and 7a of and are arranged flush with the cavity mold surface 2a of the split mold 2. Therefore, as in the past,
The protective cover C and the like do not project into the cavity of the casting mold 1 and do not make holes in the product. Further, it is not necessary to consider the release direction of the product.

Further, the protective cover 7 is held at its tip portion by the holding portion 4b of the holder tubular portion 4 with the heat insulating air layer 6 provided between the protective cover 7 and the inner peripheral surface of the tubular portion 4 of the holder 3. Further, with the measuring point 12 arranged inside the tip surface 7a which is flush with the cavity mold surface 2a of the protective cover 7, the electrical insulating material 8 is filled and the wire 10 of the thermocouple temperature sensor 9 is filled. 11 is provided in the protective cover 7. Therefore, the temperature of the molten metal M itself can be measured by preventing the thermocouple temperature sensor 9 from measuring the temperature of the split mold 2 as much as possible, and the same effect as described in the section of the action and effect of the invention described above can be obtained. Play.

Further, in the molten metal temperature measuring apparatus of the embodiment, the wall thickness t0 of the front end surface 7a of the protective cover 7 is 0.4 to 0.4.
The distance t1 between the measuring point 12 of the thermocouple temperature sensor 9 and the inside of the protective cover tip surface 7a, which is 1.0 mm and is filled with the electric insulating material 8, is set within the range of 0.3 to 1.0 mm. Therefore, durability can be improved and manufacturing can be easily performed while maintaining a short response time of temperature measurement. By the way, the wall thickness t0 of the tip surface 7a of the protective cover 7 is 1.0 mm.
If it exceeds, the response time of temperature measurement will take longer,
If it is less than 0.4 mm, it becomes difficult to manufacture the protective cover 7 and the durability is reduced. Further, when the distance t1 between the measuring point 12 of the thermocouple temperature sensor 9 filled with the electric insulating material 8 and the inside of the tip end surface 7a of the protective cover exceeds 1.0 mm, the response time of temperature measurement is long. Take
If it is less than 0.3 mm, it is necessary to manufacture the thermocouple temperature sensor 9 so that the measuring point 12 of the thermocouple temperature sensor 9 does not come into contact with the protective cover 7 so as not to be conductive, which makes the manufacturing of the device difficult.

By the way, the molten metal temperature measuring apparatus of the embodiment,
A molten metal temperature measuring device similar to that of the embodiment, but a device in which the protective cover 7 was embedded in the split mold 2 at a distance of 5.0 mm from the molten metal (a device similar to the device of FIG. Table 1 shows a test example in which the response time of the temperature measurement when measuring the molten metal temperature is measured by using an apparatus.

The molten metal temperature measuring device of the embodiment and the conventional approximation device are t0 = 1.0 mm and t1 = 1.0 mm.
Type, t0 = 1.0 mm and t1 = 0.3 mm, t0 = 0.4 mm and t1 = 1.0 mm, t0 = 0.4 mm and t1 = 0.3 mm I prepared four types of each.

The molten metal is 400 ° C. and 500, respectively.
It was examined at ℃, 600 ℃, and 700 ℃.

As the response time, the time when the temperature reached (temperature at the time of stability-initial temperature (room temperature)) × 63.2% was examined.

[0031]

[Table 1]

As can be seen from Table 1, in all the types of devices, the response time is shorter than that of the conventional approximation device, and the temperature of the molten metal can be appropriately measured.

Further, the thickness t of the tip surface 7a of the protective cover 7 is
0 is in the range of 0.4 to 1.0 mm, and the distance t1 between the measurement point 12 of the thermocouple temperature sensor 9 and the inside of the protective cover distal end surface 7a filled with the electric insulating material 8 is 0. .3 ~
If it is within the range of 1.0 mm, the response time of the temperature measurement of the molten metal is kept short because the difference is small even if the response times of the respective types of the conventional approximation device and the device of the embodiment are compared. It turns out that you can do it.

In the molten metal temperature measuring apparatus of the embodiment, the holder 3 has the flange portion 5 formed therein.
In this way, when the flange portion 5 is formed on the holder 3, the tip portion 4a, 7a of the tubular portion 4 or the protective cover 7 can be easily used for the cavity of the split mold 2 while holding the protective cover 7 or the like. It can be arranged flush with the mold surface 2a.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a conventional example.

FIG. 3 is a cross-sectional view showing another conventional example.

[Explanation of Codes] 1 ... Casting mold, 2 ... Split mold, 2a ... Cavity mold surface, 3 ... Holder, 4a ... Tip surface, 6 ... Insulating air layer, 7 ... Protective cover, 7a ... Tip surface, 8 ... electric insulating material, 9 ... thermocouple temperature sensor, 10 ... element wire, 11 ... element wire, 12 ... measurement point, M ... molten metal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsujihiko Yasuda 107 Takanedai, Midori-ku, Nagoya-shi, Aichi

Claims (2)

[Claims] 1. A molten metal temperature measuring device for measuring the temperature of a molten metal injected into a casting mold by using a thermocouple temperature sensor, wherein the molten metal temperature measuring device is embedded and fixed in the casting mold and has a tip surface having a cavity. A cylindrical holder that can be seen flush with the mold surface, and a tip end face that is flush with the tip face of the holder and that is adiabatic air between the holder inner peripheral face. A layer is provided, and a protective cover whose tip is held on the inner peripheral surface of the tip of the holder, and an electrical insulating material filled in the protective cover and embedded therein, the measurement point being arranged inside the tip surface of the protective cover. A molten metal temperature measuring device comprising: a wire of the thermocouple temperature sensor; 2. The thickness of the front end surface of the protective cover is 0.4
˜1.0 mm, and the distance between the measurement point of the wire of the thermocouple temperature sensor filled with the electrical insulating material and the inside of the tip end surface of the protective cover is 0.3 to 1.0 mm. The molten metal temperature measuring device according to claim 1.