JPH0674837A - Method and device for detecting heat flux of mold for casting - Google Patents

Abstract

PURPOSE:To detect the heat flux flowing to the thickness direction of a wall part, by inserting in a hole of the mold wall part a sensor in which a metal of a different kind is joined to an end of a metal bar of the same material as a mold for casting, and by connecting the metal piece of the different kind to the hole bottom. CONSTITUTION:A sensor 11 comprises a metal bar 12 of the same material as a mold M and a metal piece 13 of a different kind secured to an end thereof and is inserted in a hole 14 made from the outside of a mold wall part W to the thickness direction, and the piece 13 is joined to the bottom of the hole 14. Thermocouples are constructed by the wall part W to the metal piece 13, and the piece 13 to the metal bar 12 respectively, and consequently a differential thermocouple is formed. Therefore, since electromotive force detected by an electromotive detecting means 26 is measured as the difference of the electromotive forces of two contacts (both sides of the metal piece 13), the temperature difference thereof can be detected. The heat flux flowing within the sensor 11 is found from a prescribed equation by using the temperature difference. The heat flux of a point to be measured within the wall part W can be detected, because the measured value of the heat flow is proportioned to the heat flux within the wall part W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mold for continuous casting,
Another method and apparatus for detecting heat flux flowing inside a casting mold.

[0002]

2. Description of the Related Art Conventionally, by measuring the temperature distribution in the wall part of a mold for continuous casting, it is possible to prevent the occurrence of surface flaws in slabs produced in continuous casting equipment and to detect the molten steel level by detecting the molten metal level in the mold. The amount of inflow is controlled.

By the way, according to this conventional technique, the temperature distribution in the wall of the mold is measured by embedding thermocouples at predetermined multipoint positions in the wall of the mold. However, from the temperature measurement point, the inner surface of the mold wall (surface on the melt side)
The distance up to fluctuates instead of being constant because the inner surface of the mold wall is polished during the continuous casting work because it is necessary to repair it, and the temperature instruction value also changes accordingly. Therefore, it is necessary to correct the temperature instruction value in consideration of such a variation, which complicates the measurement. Further, if the embedded depth of the thermocouple in the mold wall portion is not constant, the measured value will include an error, so that the accurate temperature distribution cannot be measured.

[0004]

Therefore, the inventors of the present invention have conducted research to eliminate the drawbacks of the conventional methods, and as a result, do not measure the temperature distribution in the mold wall, but measure the temperature inside the mold wall. It has been found to be advantageous to detect the flowing heat flux.

Therefore, the object of the present invention is to
This is to detect the heat flux flowing in the wall thickness direction of the wall portion inside the mold wall portion.

By the way, as a method for detecting such a heat flux, an apparatus using two sheath thermocouples 1 and 2 as shown in FIG. 7 was devised prior to the present invention. In this device, the two sheath thermocouples 1 and 2 are embedded in parallel with each other by inserting them into the holes formed in the mold wall W so that they are close to each other and parallel to each other. They are arranged so as to be displaced by a distance d in the thickness direction of W.
Therefore, from the temperature T ₁ measured by the thermocouple 1 deeply inserted and the temperature T ₂ measured by the thermocouple 2 shallowly inserted, the heat flux q flowing in the wall W is q = λ / d・
It can be obtained by the equation (T ₁ −T ₂ ), where λ is the thermal conductivity of the wall W.

However, since the above-mentioned apparatus has two thermocouples 1 and 2 arranged in parallel, it is doubtful whether the heat flux of the mold wall portion as intended by the present invention can be measured correctly. . That is, as is apparent from FIG. 7, since the two thermocouples 1 and 2 cannot be arranged on the same axis, they cannot be arranged on the same line in the wall thickness direction of the wall portion W, and the temperature measurement at the tips of both ends is not performed. Inevitably, the part is displaced by the distance D. Therefore, since the tip temperature measuring units of the two thermocouples 1 and 2 cannot be arranged on the same heat flux, the true heat flux cannot be detected.

[0008]

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for detecting heat flux in a casting mold that solves the above problems.

Therefore, the present invention is configured as a means of a method invention, in which a sensor constructed by joining dissimilar metal pieces to the tip of a metal rod of the same material as the casting mold is used in the wall thickness direction of the mold. By inserting the dissimilar metal piece into the hole formed in the hole and joining the dissimilar metal piece to the bottom portion of the hole, the first thermocouple made of the mold wall and the dissimilar metal piece and the second thermocouple made of the dissimilar metal piece and the metal rod. A differential thermocouple composed of a thermocouple and a electromotive force between the mold and the rear end of the metal rod are detected to detect a temperature difference between both ends of the dissimilar metal piece so that the heat flow in the wall thickness direction of the mold wall portion. The point is to detect the bundle.

The present invention is configured as the first means of the apparatus invention. The sensor is constructed by joining a dissimilar metal piece to the tip of a metal rod made of the same material as the casting mold, and the sensor is provided from the outside of the mold. The hole is formed in the wall thickness direction of the mold and into which the sensor is inserted, and the electromotive force detection means provided between the mold and the rear end of the metal rod. By bonding to the bottom of the hole, a differential thermocouple comprising a first thermocouple consisting of the mold wall and the dissimilar metal piece and a second thermocouple consisting of the dissimilar metal piece and the metal rod is constructed. is there.

Further, the present invention is configured as the second means of the device invention. In the casting mold, the cooling box forming the refrigerant chamber is fixed to the outside through a fastening bolt. A sensor formed by joining dissimilar metal pieces to the tip of the metal rod, an insertion hole penetrating in the axial direction of the tightening bolt for inserting the sensor, and a wall of the mold from the tip of the tightening bolt. A hole formed in the wall thickness direction for inserting the vicinity of the tip of the sensor, and an electromotive force detecting means provided between the mold and the rear end of the metal rod. By bonding to the bottom of the hole, a differential thermocouple comprising a first thermocouple consisting of the mold wall and the dissimilar metal piece and a second thermocouple consisting of the dissimilar metal piece and the metal rod is constructed. is there.

In an embodiment of the device of the present invention, the sensor is configured such that a similar metal piece of the same material as the mold is attached to the different metal piece at the tip side, and the same metal piece is joined to the hole at the bottom of the hole. Will be adopted.

Further, in the embodiment of the present invention, a hole is bored through in the wall thickness direction of the mold, and the same kind metal piece of the same material as the mold is attached to the different kind metal piece at the tip side of the sensor, A configuration in which a sensor is inserted into the hole of the mold and the same-type metal piece is joined to the hole is selectively adopted.

In the embodiment of the present invention, the sensor may be provided with an insulating coating such as a ceramic coating that covers the outer peripheral surface of the sensor.

Further, in the embodiment of the present invention, from the insertion hole of the tightening bolt into which the sensor is inserted to the hole in the mold wall portion into which the vicinity of the tip of the sensor is inserted, there is electrical insulation. A configuration in which a filler having a heat dissipation property higher than that of air is filled is selectively adopted.

Further, in the embodiment of the present invention, it is preferable to provide a cooling means for cooling the metal rod forming the sensor, and the cooling means is constituted by a refrigerant chamber of a cooling box having a tightening bolt penetrating therethrough. Alternatively, the cooling means provided in the wall of the mold may also be used.

Furthermore, in the embodiment of the present invention, the metal rod forming the sensor has a small cross-sectional area on the tip side of the metal rod to form a small diameter portion, and has a large cross-sectional area on the tail end side. Thus, the large diameter portion can be formed.

Embodiments of the present invention will be described in detail below with reference to the drawings.

(First Embodiment) In the first embodiment shown in FIGS. 1 and 2A, the sensor 11 has a metal rod 12 made of the same material as the mold M, and is joined and fixed to the tip of the metal rod 12. A hole 14 formed from the outside of the mold wall W in the thickness direction of the wall.
And the dissimilar metal piece 13 is joined to the hole bottom portion of the hole 14.

The sensor 11 is attached by penetrating a cooling box 15 provided outside the mold wall W. That is, the cooling box 15 is composed of an inner plate 15a joined to the outer surface of the mold wall W and an outer plate 15b forming a coolant chamber 16 outside the inner plate 15a, and penetrates both plates 15a, 15b. Tightening bolt 1
The tip end of 7 is screwed into the mold wall W, and the nut 9 is fastened to the tail end of the tightening bolt 17 via the seal block 8 for assembly.

Therefore, the insertion hole 18 is penetrated along the axis of the tightening bolt 17, and the tightening bolt 17 is also inserted.
At the tip of the hole 14 so as to communicate with the insertion hole 18.
And the dissimilar metal piece 13 at the tip of the sensor 11 inserted through the insertion hole 18 is pressure-welded to the hole bottom portion of the hole 14 and joined by welding or the like. Therefore, in the sensor 11, the portion of the metal rod 12 inserted into the cooling box 15 is preferably cooled. In other words, the cooling means 27 is constituted by the refrigerant in the cooling box 15.

When the dissimilar metal piece 13 is pressed against the bottom of the hole, the sensor 11 is inserted from the tail end of the tightening bolt 17.
A pressing means 20 is provided at the tail end of the (metal rod 12). That is, the pressing means 20 is inserted and fixed through a case 21 provided at the tail end of the tightening bolt 17 and a screwing means such as a male and female screw that is screwed into the opening on the tail end side of the case 21. Receiving member 22, a flange member 23 fixed to the shaft portion of the sensor 11 (metal rod 12) located in the case 21, and a compression coil interposed between the flange member 23 and the receiving member 22. A biasing member 24 such as a spring, which always separates the collar member 23 from the receiving member 22,
Therefore, the sensor 11 is urged in the direction of pressing it against the mold wall W. This urging force is generated when the sensor 11 has a diameter of 2
When it is -9 mm, it is preferable that it is about 3-6 kgf / mm ² . The tail end 12 of the sensor 11 (metal rod 12)
The a is inserted into the outside through the receiving member 22.

When the hole bottom of the hole 14 and the dissimilar metal piece 13 at the tip of the sensor 11 are welded, the pressing means 20 becomes unnecessary.

The outer peripheral surface of the sensor 11 is made of ceramic (A
It is covered with an insulating coating 25b such as a coating of (1 ₂ O ₃ ) or the like, whereby the sensor 11 is electrically insulated from the tightening bolt 17, the pressing means 20 and the like.

Further, from the insertion hole 18 of the tightening bolt 17 into which the sensor 11 is inserted to the hole 14 of the mold wall into which the tip end portion of the sensor 11 is inserted, there is electrical insulation and air Is also filled with a filler excellent in heat dissipation, for example, a filler 25a made of a heat dissipation silicone resin. Therefore, the filler 25a is applied between the outer peripheral surface of the sensor 11 inserted into the insertion hole 18 and the inner peripheral surface of the insertion hole 18, and the outer peripheral surface of the sensor 11 inserted into the hole 14 of the mold wall W. Between the inner peripheral surface of the hole 14 and the inner peripheral surface of the hole 14, which promotes heat dissipation of the metal rod 12, thereby promoting heat flux in the sensor 11 itself.
The heat flux of the mold wall W can be appropriately grasped.

The insulating coating 25b and the filler 25a are used.
May be selectively used, or both may be used together.

In such a structure, the mold M and
An electromotive force detection means 26 is provided between the tail end 12a of the metal rod 12 inserted from the pressing means 20, and the mold wall W and the dissimilar metal piece 13 constitute a first thermocouple. The dissimilar metal piece 13 and the metal rod 12 constitute a second thermocouple, and the first and second thermocouples constitute a differential thermocouple.

That is, as a result of such a differential thermocouple being constructed, the electromotive force detected by the electromotive force detecting means 26 is
An electromotive force (measurement temperature T ₁ ) generated by a first thermocouple composed of the mold wall W and the dissimilar metal piece 13;
Since it is measured as the difference between the electromotive force (measured temperature T ₂ ) generated by the second thermocouple composed of the dissimilar metal piece 13 and the metal rod 12 at the two contacts, the temperature difference (T ₁ -T ₂₎ can be detected.

As a result, the heat flux q flowing in the sensor 11 can be obtained by the equation q = λ / d (T ₁ -T ₂ ) (where λ is the heat conduction of the dissimilar metal piece 13). Rate, d is the thickness of the dissimilar metal piece 13). That is, on the same axis of the sensor 11 arranged in the wall thickness direction of the mold wall W, the temperature difference (T ₁ −
It functions as a heat flow sensor that generates an electromotive force according to T ₂ ), and the measured heat flow value detected by this is proportional to the heat flux in the mold wall W, so it should be measured inside the mold wall W. The heat flux at a point can be detected. When detecting the heat flux, since the sensor 11 cools the portion of the sensor 11 closer to the rear end than the dissimilar metal piece 13 by the cooling means 27, the heat flux in the sensor 11 itself is promoted and the heat flow of the mold wall W is increased. The bundle can be properly grasped.

In order to construct such a differential thermocouple,
As compared with the case where the mold M is copper or iron, the materials of the metal rod 12 and the dissimilar metal piece 13 that form the sensor 11 can be selected as follows, and the thickness of the dissimilar metal piece 13 is as follows. It is preferable to set as follows. However, in Table 1 below, the diameter of the sensor (metal rod 12) is 2
~ 9φ mm.

[Table 1]

(Second Embodiment) In the second embodiment of the present invention, as shown in FIG. 2 (B), the mold is located further to the sensor tip side with respect to the dissimilar metal piece 13 of the sensor 11. A metal piece 28 of the same material as M is attached, and the metal piece 28 of the same kind is joined at the hole bottom portion of the hole 14. Other configurations are similar to those of the first embodiment.

According to the second embodiment, when the tip of the sensor 11 is inserted into the hole 14, the metal piece 28 of the same kind is well joined to the hole bottom portion of the hole 14 in the mold M, so that the contact is poor. There is no fear of

(Third Embodiment) In the third embodiment shown in FIG. 3, the sensor 11 is a metal rod 12 made of the same material as the mold M.
It is configured by joining a dissimilar metal piece 13 to the tip of, and is inserted into the mold wall portion W through the housing 36 that protects the sensor 11.

Regarding the third embodiment, the difference from the first embodiment will be described. The tip of the sensor 11 is made to penetrate the housing 36, and then the coolant passage 29 formed in the mold wall W is formed. After passing through, the coolant passage 29 is inserted into a through hole 30 having a different diameter, which penetrates the inner surface of the mold wall W (the surface in contact with the molten metal). That is,
The through hole 30 is a large diameter hole 30a facing the refrigerant passage 29.
And a small diameter hole 30b facing the inner surface of the mold wall W, and the dissimilar metal piece 13 at the tip of the sensor is positioned in the large diameter hole 30a.

The small-diameter hole 30b is closed by fitting the same kind metal piece 28 of the same material as the mold, which is joined to the different kind metal piece 13 of the sensor 11 from the inner surface side or the outer surface side of the mold wall portion W. As a result, there is no fear of contact failure of the dissimilar metal piece 13 at the tip of the sensor, and the pressing means 20 in the above-described first embodiment becomes unnecessary.

The coolant flowing through the coolant passage 29 constitutes cooling means for the mold wall W and the sensor 1
A cooling means 27 a for cooling the first metal rod 12 is configured.
In order to prevent the refrigerant from leaking in the refrigerant passage 29, an O-ring 32 seals between the outer peripheral surface of the metal rod 12 and the inner peripheral surface of the large diameter hole 30a at a position adjacent to the refrigerant passage 29 and the large diameter hole 30a. The O-ring 33 seals between the outer peripheral surface of the metal rod 12 and the inner peripheral surface of the insertion hole 18 in the housing 36. The other configurations are similar to those of the first embodiment and are designated by the same reference numerals.

(Fourth Embodiment) A fourth embodiment shown in FIG. 4A shows another structure of the same metal piece 28 in the third embodiment. In this embodiment, the homogeneous metal piece 28
Is composed of a screw 34 made of the same metal material as the mold M, and is screwed into a female screw formed in the small diameter hole 30b of the through hole 30. That is, it is screwed into the small diameter hole 30b from the inner surface side of the mold wall portion W. Other configurations are shown in FIG.
It is similar to the third embodiment shown in FIG.

(Fifth Embodiment) A fifth embodiment shown in FIG. 4 (B) shows still another structure of the same type metal piece 28 in the third embodiment. That is, in this embodiment, the metal piece 28 of the same kind is constituted by the taper pin 35 made of the same kind of metal as the mold M and is driven into the small diameter hole 30b from the inner surface side of the mold wall W. Other configurations are similar to those of the third embodiment shown in FIG.

In both the fourth embodiment and the fifth embodiment, the homogeneous metal piece 28 is previously attached to the dissimilar metal piece 13 on the tip side of the sensor 11 and penetrates the sensor 11 from the inside of the mold M. When inserting the same type metal piece 28 from the inside of the mold M into the through hole 30 when inserting into the hole 30.
, The end of the same metal 28 protruding from the opening edge of the through hole 30 is cut off, and the cut end is ground so as to be flush with the inner surface of the mold wall W. In the fourth embodiment, the same type metal piece 28 may be fitted into the through hole 30 from the outside of the mold M, and the sensor 11 may be inserted into the through hole 30 from the outside of the mold M. If necessary, the cut end of the same type metal piece 28 may be welded to the opening edge of the through hole 30.

(Sixth Embodiment) In the sixth embodiment shown in FIG. 5, the metal rod 12 constituting the sensor 11 has a small diameter portion 12b having a small cross-sectional area on the tip side and a cut on the tail end side. A large-diameter portion 12c having a large area is configured.

In one example shown in FIG. 5A, a tapered portion 12d is formed between the small diameter portion 12b and the large diameter portion 12c,
The insertion hole 18 of the tightening bolt 17 is formed with a tapered hole portion 18a having a similar shape to the tapered portion 12d.

On the other hand, in another example shown in FIG.
A different-diameter step portion 12e is formed between the small-diameter portion 12b and the large-diameter portion 12c, and the different-diameter step portion 12e is formed in the insertion hole 18 of the tightening bolt 17.
The different-diameter hole portion 18b having a similar shape is formed.

The other structure of the sixth embodiment is the same as that of the first embodiment.

Therefore, according to the sixth embodiment, the large-diameter portion 12c has a large heat dissipation effect as compared with the small-diameter portion 12b.
Since the temperature gradient at both ends of the dissimilar metal piece 13 is increased, the output of the sensor 11 can be increased.
Further, since the heat flow to the sensor 11 itself can be promoted, the heat flux of the mold wall portion W can be appropriately grasped and accurately detected.

(Seventh Embodiment) A seventh embodiment shown in FIG.
This is a modification of the first embodiment described above with reference to FIG. 1, and the sensor 11 is attached by inserting through holes 34a and 34b penetrating the cooling box 15 without using the above-described tightening bolt. The tip of the sensor 11 has a hole 14 in the mold wall W formed coaxially with the through hole 34a.
And the dissimilar metal piece 13 at the tip is joined to the hole bottom portion of the hole 14.

For this purpose, an annular nut 41 is watertightly screwed onto the inner plate 15a constituting the cooling box 15, and a cylindrical sleeve 42 is attached to the outer plate 15b.
Is watertightly screwed, the sensor 11 is inserted through the sleeve 42 and the nut 41 arranged coaxially, and the watertight sealing means 4 such as an O-ring is provided.
It is held via 3, 44. The outer peripheral surface of the sensor 11 has an insulating coating 25b as in the first embodiment.
And the filler 2 as in the first embodiment.
5a does not have.

Other structures in the seventh embodiment are the same as those in the first embodiment, and the same structures are denoted by the same reference numerals.

[0047]

According to the present invention as set forth in claim 1 or 2, the temperature difference between both ends of the dissimilar metal piece 13 of the sensor 11 can be measured and the heat flux flowing in the sensor 11 can be detected. The heat flux in the wall thickness direction of the mold wall W can be detected.

With respect to this point, in the method or apparatus for measuring the temperature of the fixed point of the mold wall portion at multiple points by the conventionally known temperature sensor, the temperature measured value is taken into consideration in consideration of the distance from the temperature measurement point to the inner surface of the mold wall portion. It is necessary to detect the temperature distribution in the mold wall portion by correcting while correcting the temperature, which complicates the measurement work, and the measured temperature value includes an error. According to the method, the heat flux due to the temperature difference is detected. As a result, the measurement work is easy regardless of the distance between the measurement point in the sensor 11 (both sides of the dissimilar metal piece 13) and the inner surface of the mold wall W. Of course, it is easy to process the blind hole 14 for inserting the tip of the sensor 11, or the through hole 30
The assembly work is easy without the need to strictly set the installation position of the tip of the sensor 11 with respect to.

Further, in the method or apparatus for detecting the heat flux using the two thermocouples as shown in FIG. 5, the two points of temperature measurement cannot be arranged coaxially, and therefore, the heat flux cannot be placed on the heat flux. While it is difficult to measure the temperature difference of, according to the present invention,
The temperature difference located on the heat flux can be measured, and the heat flow velocity can be measured correctly.

Further, according to the present invention, since the heat flux flowing through the sensor 11 can be made equal to the heat flux flowing through the mold wall portion, the installation of the sensor 11 does not adversely affect the mold. Absent.

According to the present invention as set forth in claim 3, since the sensor 11 can be attached to the casting mold by utilizing the tightening bolts 17 in the existing cooling box 15, it is easy to implement and low in cost. There is an effect that the present invention can be realized by cost. That is, it is sufficient to form the hole 14 in the mold wall portion and the insertion hole 18 in the tightening bolt 17, and there is an advantage that it is not necessary to further process the existing equipment. Moreover, since the sensor 11 is configured to be inserted and held in the insertion hole 18 of the tightening bolt 17, the sensor 11
The cooling box 1 can, of course, enable stable mounting of the
There is an effect that the insulating property from the refrigerant in 5 is also excellent.

According to the present invention described in claim 4 or 5,
There is no risk of poor contact between the dissimilar metal piece 13 of the sensor 11 and the mold wall W, and there is an effect that a good detection result can always be obtained.

According to the present invention of claim 6 or 7,
It can be expected that the sensor 11 is completely insulative, which is extremely effective in achieving the intended purpose. In particular, according to the invention as claimed in claim 7, the filler 25a is
Since the heat dissipation property of No. 1 is promoted, the heat flow to the sensor 11 itself is promoted, and it is possible to contribute to grasping the heat flux of the mold wall portion.

According to the present invention as set forth in claim 8, the heat flow to the sensor 11 itself can be further promoted by the cooling means, and the heat flux of the mold wall portion W can be accurately detected while being properly grasped. There is an effect that the point is further excellent.

According to the present invention as defined in claim 9 or 10, the cooling means 2 for promoting heat flow in the sensor 11 itself.
Since 7 and 27a can be shared by the cooling means of the mold, there is an effect that a special configuration for the cooling means is not required and the structure of the entire apparatus can be simply configured.

According to the eleventh aspect of the present invention, the sensor 11 is configured so that the large-diameter portion 12c on the tail end side has a greater heat dissipation effect than the small-diameter portion 12b on the tip side, and the dissimilar metal piece is formed. Since the temperature gradient at both ends of 13 is increased, the sensor 11
The output of the sensor can be increased and the sensor 1
Since the heat flow to 1 itself can be promoted, the mold wall W
There is an effect that the heat flux can be accurately detected while appropriately grasping.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the device of the present invention.

2A and 2B show essential parts of the device of the present invention, FIG. 2A being a cross-sectional view showing the tip of the sensor according to the first embodiment, and FIG. 2B showing the tip of the sensor according to the second embodiment. FIG.

FIG. 3 is a cross-sectional view showing a third embodiment of the device of the present invention.

4A and 4B show essential parts of the device of the present invention, FIG. 4A is a cross-sectional view of the tip of the sensor according to the fourth embodiment, and FIG. 4B is a cross-sectional view of the tip of the sensor according to the fifth embodiment. Is.

FIG. 5 shows an essential part of a sixth embodiment of the device of the present invention, (A)
FIG. 4B is a cross-sectional view of the tip of the sensor according to one example, and FIG. 9B is a cross-sectional view of the tip of the sensor according to another example.

FIG. 6 is a transverse sectional view showing a seventh embodiment of the device of the present invention.

FIG. 7 is a cross-sectional view showing a comparative example with respect to the present invention.

[Explanation of symbols]

 11 sensor 12 metal rod 12a tail end 12b small diameter portion 12c large diameter portion 12d taper portion 12e different diameter stepped portion 13 dissimilar metal piece 14 hole 15 cooling box 16 cooling chamber 17 tightening bolt 18 insertion hole 20 pressing means 25a filler 25b Insulating coating 26 Electromotive force detecting means 27 Cooling means 27a Cooling means 28 Similar metal piece 29 Refrigerant passage 30 Through hole 30a Small diameter hole 30b Large diameter hole 34 Screw 35 Taper pin 36 Housing 41 Annular nut 42 Cylindrical sleeve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Fukuda 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Stock company (72) Inventor Yasumasa Omura Kimitsu, Kimitsu-shi, Chiba New Nippon Steel Stock company Kimitsu Works (72) Inventor Ikuhei Sakaguchi 1-7-10 Nishihonmachi, Nishi-ku, Osaka-shi, Osaka Inside Kawaso Electric Industry Co., Ltd. (72) Kenichi Gomei Nishihonmachi, Nishi-ku, Osaka-shi, Osaka 1-7-10 Kawaso Electric Industry Co., Ltd. (72) Inventor Osamu Ikawa 1-7-10 Nishihonmachi, Nishi-ku, Osaka City, Osaka Prefecture Kawaso Electric Electric Industry Co., Ltd.

Claims (11)

[Claims] 1. A sensor formed by joining a dissimilar metal piece to the tip of a metal rod made of the same material as the casting mold is inserted into a hole formed in the wall thickness direction of the mold, and the dissimilar metal piece is formed. By bonding to the hole bottom portion, to form a differential thermocouple consisting of the mold wall portion and the first thermocouple by the dissimilar metal piece, and the second thermocouple by the dissimilar metal piece and the metal rod, By detecting an electromotive force between the mold and the rear end of the metal rod, the heat flux in the wall thickness direction of the mold wall is detected from the temperature difference between both ends of the dissimilar metal piece. Heat flux detection method. 2. A sensor formed by joining dissimilar metal pieces to the tip of a metal rod made of the same material as the casting mold, and the sensor inserted from the outside of the mold in the wall thickness direction of the mold. The mold wall portion and the different kind of metal are formed by bonding the dissimilar metal piece to the hole bottom portion of the hole, which is composed of a hole to be formed and an electromotive force detecting means provided between the mold and the rear end of the metal rod. A heat flux detecting apparatus for a casting mold, comprising a differential thermocouple including a first thermocouple made of a metal piece and a second thermocouple made of the dissimilar metal piece and a metal rod. 3. A casting mold in which a cooling box constituting a refrigerant chamber is fixed to the outside through a fastening bolt, and a dissimilar metal piece is joined to the tip of a metal rod made of the same material as the mold. A sensor, and an insertion hole formed to penetrate the tightening bolt in the axial direction to insert the sensor,
A hole that is formed in the wall thickness direction of the mold from the tip of the tightening bolt to insert the vicinity of the tip of the sensor,
The electro-motive force detection means is provided between the mold and the rear end of the metal rod, and by joining the dissimilar metal piece to the hole bottom portion of the hole, the mold wall portion and the dissimilar metal piece And a second thermocouple composed of the different type metal piece and the metal rod, and a differential thermocouple is constructed. 4. A sensor, wherein the same kind of metal piece made of the same material as that of the mold is attached to the different kind metal piece at the tip side of the sensor, and the same kind metal piece is joined to the hole at the bottom of the hole. Or the heat flux detection device for the casting mold according to item 3. 5. A mold is formed by penetrating a hole in a wall thickness direction of a mold and attaching a metal piece of the same material as that of the mold to a dissimilar metal piece on the tip side of the sensor. The heat flux detecting device for a casting mold according to claim 2, 3 or 4, wherein the heat flux detecting device is inserted into a hole and the same kind of metal piece is fitted into the hole. 6. The heat flux detection device for a casting mold according to claim 2, 3, 4 or 5, wherein an insulating coating made of a ceramic coating or the like for coating the outer peripheral surface of the sensor is provided. 7. A hole extending from a through hole of a tightening bolt, into which a sensor is inserted, to a hole in a mold wall, into which a portion near the tip of the sensor is inserted, and which has electrical insulation and has higher heat dissipation than air. The heat flux detection device for a casting mold according to claim 2, 3, 4, 5, or 6, wherein the device is filled with a filler. 8. A cooling means for cooling a metal rod constituting a sensor is provided.
The heat flux detection device for a casting mold according to 5, 6, or 7. 9. The heat flux detecting device for a casting mold according to claim 8, wherein the cooling means is constituted by a coolant chamber of a cooling box having a tightening bolt penetrating therethrough. 10. The heat flux detecting device for a casting mold according to claim 8, wherein the cooling means also serves as a cooling means for the mold. 11. A metal rod forming a sensor comprises a small diameter portion having a small cross-sectional area on the tip side and a large diameter portion having a large cross-sectional area on the tail end side. Item 2,
The heat flux detection device for a casting mold according to 3, 4, 5, 6, 7, 8, 9 or 10.