JP2003181601A - Casting method and casting apparatus - Google Patents

Abstract

[57] [Problem] To accurately control the temperature of molten steel even when high-precision temperature control of molten steel is required, for example, when casting a high-quality product with a thin wall and a complicated shape at a high yield. Provided is a casting method and a casting apparatus which can measure a molten steel temperature so as to be managed and reduce costs required for the temperature measurement. SOLUTION: The allowable range of the molten steel temperature with respect to the reference temperature is ±
The temperature is measured in a mode of 5 ° C., and the output of the melting furnace 1 is adjusted based on the measured temperature to perform casting. In the measurement, the optical fiber 11 is used as a temperature measuring unit and the tip is molten steel 2. It is made continuously by facing

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a casting method and a casting apparatus. More specifically, the present invention relates to a casting method and a casting apparatus capable of measuring and controlling the temperature of molten steel with desired accuracy and adapted to, for example, casting thin-walled products having a complicated shape.

[0002]

2. Description of the Related Art Conventionally, as a temperature measuring method for measuring the temperature of molten steel, a temperature measuring method using a consumable immersion thermocouple (immersion thermocouple) has been generally used. This is a method of immersing a thermocouple in molten steel for a short time to measure the molten steel temperature, and replacing it each time the measurement is performed. Although this method can measure the molten steel temperature accurately, it has the following problems.

(1) Temperature cannot be measured until all the raw materials have melted down.

(2) Only the instantaneous temperature can be measured, and continuous temperature measurement is impossible.

(3) It is a consumable type and cannot cope with resource saving, and since a noble metal such as platinum is used at the detection end, the cost is high.

(4) Automation is difficult.

As described above, since the molten steel temperature measuring method using the consumable immersion thermocouple is relatively expensive and it is difficult to continuously measure the temperature, a temperature measuring method using an optical fiber has recently attracted attention. Is starting to appear.

FIG. 13 shows an example of a conventional molten steel temperature measuring method using an optical fiber (see Japanese Patent Laid-Open No. 59-88629). In this molten steel temperature measuring method, molten steel 101 and float 102
A container 103 made of an optical conductor is provided so as to project downward from the float 102, and the tip portion of the optical fiber 104 is inserted into the container 103, thereby condensing the radiation rays of the molten steel 101, The concentrated light beam is guided to the two-color thermometer 105, and the molten steel 101
It is supposed to measure the temperature of.

According to this temperature measuring method, the molten metal 101 has a molten metal surface H '.
Molten steel 101 without being affected by the slag formed in the
Can measure the temperature of the optical fiber 1
Since 04 is not directly immersed in the molten steel 101, the temperature can be measured without consuming the optical fiber 104.

However, even in this molten steel temperature measuring method, the float 102 and the container 103 are inevitably worn and deteriorated.
Regular maintenance is indispensable, and there is a limit in accuracy because it does not detect thermal radiation energy directly from molten steel.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a high precision of molten steel, for example, when casting a high-quality product having a thin wall and a complicated shape with a high yield. It is an object of the present invention to provide a casting method and a casting apparatus capable of measuring the molten steel temperature so that the temperature can be controlled with proper accuracy even when the temperature control of I am trying.

[0012]

The first of the casting methods of the present invention
The form is a casting method in which the molten steel temperature is measured in such a manner that the allowable width with respect to the reference temperature is ± 5 ° C., and the output of the melting furnace is adjusted based on the measured temperature to perform casting. It is characterized in that the fiber is used as a temperature measuring part and the tip thereof is exposed to the molten steel so as to be continuously formed.

In the second mode of the casting method of the present invention, the molten steel temperature is measured in such a manner that the permissible width with respect to the reference temperature is ± 5 ° C., and the output of the melting furnace is adjusted based on the measured temperature for casting. The casting method is characterized in that the measurement uses an optical fiber as a temperature measuring section, and the tip of the optical fiber is immersed in a direction perpendicular to the molten metal surface to measure the molten steel temperature.

In this case, the molten steel temperature may be measured in synchronization with the injection of the molten steel into the mold.

In the third embodiment of the casting method of the present invention, the molten steel temperature is measured at a specific timing with an allowable width of ± 10 ° C. with respect to the reference temperature, and the output of the melting furnace is adjusted based on the measured temperature for casting. The casting method according to claim 1, wherein the specific timing is when the mold is pulled up from the molten metal surface.

On the other hand, the casting apparatus of the present invention comprises a melting furnace for melting the material metal, a temperature detecting means for detecting the temperature of the molten steel melted by the melting furnace, and the melting based on the value detected by the temperature detecting means. A temperature control device for controlling the temperature of the furnace is provided, and the temperature detection means is configured to detect the molten steel temperature with desired accuracy.

In the casting apparatus of the present invention, the temperature detecting means has an optical fiber as a temperature measuring body, the temperature measuring portion of the optical fiber is covered with a float, and the float is floated on the surface of molten steel. Temperature detection may be performed in the state.

In the casting apparatus of the present invention, the float may be fixed to the melting furnace such that the temperature measuring surface of the optical fiber always faces the molten steel.

Further, in the casting apparatus of the present invention, the temperature detecting means has a fiber length adjusting mechanism for unwinding and winding the optical fiber, and the fiber length adjusting mechanism serves as a conveying mechanism for conveying the mold. The optical fiber may be mounted and the length adjustment of the optical fiber by the fiber length adjustment mechanism may be performed in synchronization with the elevation of the mold by the transport mechanism.

Further, in the casting apparatus of the present invention, the temperature detecting means has a fiber length adjusting mechanism for unwinding and winding up the optical fiber, and the fiber length adjusting mechanism functions as a temperature measuring portion of the optical fiber. It may be attached to a moving mechanism that moves the measuring position and the retracted position. In this case, it is preferable that the tip of the optical fiber be soaked in a direction oblique to the vertical direction with respect to the molten metal.

[0021]

Since the present invention is constructed as described above, it is possible to cast the molten steel at a temperature corresponding to the casting.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on the embodiments with reference to the accompanying drawings, but the present invention is not limited to such embodiments.

Embodiment 1 FIG. 1 shows a schematic configuration of a casting system to which a casting method according to Embodiment 1 of the present invention is applied, and this casting system K
Is a melting furnace (hereinafter, simply referred to as a furnace) 1 including, for example, a high-frequency induction furnace, and melts a raw material metal into molten steel 2. This is a CLAS method (counter gravity).
low pressure air melt san
It is a precision casting system for producing thin-walled and complex-shaped castings by injecting into the mold 3 (see FIG. 2) in d).

That is, the casting system K is provided with a temperature control device M, which controls the temperature of the molten steel 2 with high precision to produce thin-walled and complex-shaped products with high yield and high quality. It is a system that enables Hereinafter, before explaining each part of the casting system K, CLA
The S method will be described.

In the CLAS method, as shown in FIG. 2, a mold (sun mold) 3 is set in a decompression container 4, and each gate 3a provided at the lower end of the mold 3 is moved from a molten metal 2 to a predetermined level. The molten steel 2 is immersed in the depth, the decompression container 4 is decompressed in this state, and then the molten steel 2 is sucked into the mold 3 so that the molten steel 2 is cast into the mold 3.
It is said to be a method of injecting so that it spreads to every corner. Further, in carrying out this CLAS method, the temperature of the molten steel 2 is controlled with an accuracy of 5 ° C. or less (± 5 ° C. or less) with respect to a reference temperature (for example, a temperature within a range of 1500 ° C. to 1650 ° C.). It is desirable to improve the yield and quality.

Next, the temperature control device M will be described. The temperature control device M measures the temperature of the molten steel 2 (hereinafter, referred to as molten steel temperature) T
A temperature detector (temperature detecting means) 10 for detecting the temperature is provided, and the furnace output is adjusted based on the detected molten steel temperature T by, for example, proportional control so that the molten steel temperature T matches the reference temperature. .

As shown in FIG. 3, the temperature detector 10 has a float 20 made of, for example, refractory bricks attached to its tip (temperature measuring part), and the float 20 is floated on the molten metal surface 2 of the molten steel 2. , The tip surface (temperature measuring surface) 11a is the lower surface 20 of the float 20.
Detection and conversion of the optical fiber 11 facing the molten steel 2 from a and the thermal radiation energy generated near the tip surface 11a corresponding to the molten steel temperature and sent through the optical fiber 11 and converting it into an electric signal. Optical fiber radiation thermometer equipped with a vessel 12 (see FIG. 1). The float 20 eventually protects the temperature measuring portion of the optical fiber 11 and suppresses its consumption.

Further, in the temperature detector 10, the molten steel 2 is the mold 3
Depending on the displacement of the molten metal surface H caused by the injection of the molten steel 2 and the displacement of the front end face 11a accompanying the wear of the optical fiber 11 and the float 20 due to the heat received from the molten steel 2,
Of the optical fiber 11 is provided with a fiber length adjusting mechanism 13 for performing unwinding and winding so as to adjust the length of the A cooler 30 is provided to cool the optical fiber 11 to reduce the rate of wear and overall degradation. As the fiber length adjusting mechanism 13, a known fiber length adjusting mechanism can be preferably used.

In such a temperature detector 10, since the float 20 pushes away the oxide 2a (see FIG. 3) formed on the molten metal surface H of the molten steel 2, the tip end surface 11
The temperature of the molten steel 2 can be accurately detected by directly exposing a to the molten steel 2.

Further, since only the front end surface 11a is exposed to the molten steel 2, it is possible to minimize its consumption. In this case, it is preferable that the material and size / shape of the float 20 be adjusted so that the float 20 is consumed at the same speed as the optical fiber 11 is consumed.

Next, the cooler 30 will be described. Cooler 30
Is mounted on the optical fiber 11 as shown in FIG.
For example, the air cooler is made of a double tube made of stainless steel, and cooling air is sent from an air pump (not shown) connected to the inner diameter side conduit 30a, thereby cooling the optical fiber 11 from the outer peripheral surface. To do. Further, the cooling air passing through the inner diameter side pipe line 30a is U at the pipe top 30c.
It turns and flows into the outer diameter side conduit 30b, and is discharged to the outside via the outer diameter side conduit 30b.

As described above, in the casting system K according to the first embodiment, the temperature measuring portion of the optical fiber 11 is always provided with the float 2.
Since it is assumed that the molten steel temperature is continuously measured by immersing it in a state of being protected by 0, it is possible to control the temperature with high accuracy and improve the yield and quality when performing precision casting. .

The tip of the optical fiber 11 is attached to the float 2.
0 so that only the front end surface 11a faces the molten steel 2 and the cooler 30 covers the heat receiving portion to suppress and cool the heat received.
It becomes possible to suppress the consumption and deterioration of 1 to the minimum,
It is possible to measure temperature continuously at low cost.

Embodiment 2 FIG. 5 shows a schematic structure of a casting system to which a casting method according to Embodiment 2 of the present invention is applied.
1 is a modification of the support mode of the optical fiber in the casting system K of the first embodiment, and the rest of the configuration is the same as that of the first embodiment.

That is, in the casting system K1, the tip portion is protected by the float 20A having the same structure as that of the first embodiment, and the heat receiving portion following the optical fiber 11A is protected by the cooler 30A having the same structure as that of the first embodiment. In consideration of the displacement range L ₁ of the molten metal surface H, the tip surface 11Aa is fixedly provided in the furnace 1 so that it is always exposed to the molten steel 2. That is, in the second embodiment, the float 20A simply serves as a protection member for the temperature measuring portion of the optical fiber 11A.

As a result, similarly to the first embodiment, it becomes possible to continuously measure the molten steel temperature while minimizing the consumption of the optical fiber 11A.

Further, in this casting system K1,
The fiber length adjusting mechanism 13 of the first embodiment can be omitted.

Embodiment 3 FIG. 6 shows a schematic structure of a casting system to which a casting method according to Embodiment 3 of the present invention is applied, and this casting system K
2 is a modification of the temperature measurement mode of the first embodiment, and the rest of the configuration is the same as that of the first embodiment.

That is, in the casting system K2,
The optical fiber 11B provided with the cooler 30B having the same configuration as that of the first embodiment and having the exposed tip portion (temperature measuring portion) is supported by the arm 41 of the transport mechanism 40 that transports the mold 3B, and the arm 41 is also supported. Is provided with a fiber length adjusting mechanism 13B having the same configuration as that of the first embodiment.
When the molten steel 2 is poured into the mold 3B by lowering the molten steel 2 into the furnace 1B, the molten steel temperature is measured by directly immersing the end portion of the optical fiber 11B in the molten steel 2 for a predetermined length. That is, in the casting system K2, each mold 3
It is assumed that the molten steel temperature is intermittently measured in synchronization with pouring into B.

This makes it possible to measure the temperature of molten steel at a low cost with a simpler mechanism when temperature control based on continuous temperature measurement is not required.

When the mold conveying mechanism has a plurality of mold supporting arms, one of them is provided with the temperature detector 10, and each time a plurality of molds 3B is poured with molten metal. It is also possible to measure the temperature.

Embodiment 4 FIG. 7 shows a schematic configuration of a casting system to which a casting method according to Embodiment 4 of the present invention is applied, and this casting system K
3 is a temperature detector 10 of the casting system K2 of the third embodiment.
The other configuration is the same as that of the third embodiment.

That is, in the casting system K3,
A dichroic thermometer is used as the detector / converter 12C, which is provided on the arm 41C of the transfer mechanism that transfers the mold 3C, and the cooler 30C having the same configuration as that of the first embodiment up to the tip.
The optical fiber 11C covered by is arranged on the arm 41C so that the front end surface 11Ca faces the molten metal surface H.

In this construction, in order to continuously measure the molten steel temperature, the injection of the molten steel 2 into the mold 3C is completed, the mold 3C is pulled up from the molten metal surface H, and the oxide film on the molten metal surface H is destroyed. The peak value of molten steel temperature when
This is adopted as the molten steel temperature T.

With this, even when high-precision temperature control is not required, the molten steel temperature is measured and controlled with appropriate precision (for example, high and low 10 ° C. (± 10 ° C.) with respect to the reference temperature). It becomes possible to do.

Embodiment 5 FIG. 8 shows a schematic structure of a casting system to which a casting method according to Embodiment 5 of the present invention is applied.
4 is the temperature detector 10 of the casting system K3 of the fourth embodiment.
The other configuration is the same as that of the fourth embodiment.

That is, in the casting system K4,
A dichroic thermometer is used as the detector / converter 12D, and the dichroic thermometer is arranged on an arm of a transfer mechanism (not shown) of the mold 3D so that the molten metal surface H in the furnace 1D is seen from an oblique direction.

In this structure, in order to continuously measure the molten steel temperature, the injection of the molten steel 2 into the mold 3D is completed, the mold 3D is pulled up from the molten metal surface H, and the oxide film on the molten metal surface H is destroyed. The peak value of the molten steel temperature at that time is adopted as the molten steel temperature T.

With this, even when high-precision temperature control is not required, the molten steel temperature is measured and controlled with appropriate precision (for example, high and low 10 ° C. (± 10 ° C.) with respect to the reference temperature). It becomes possible to do.

Embodiment 6 FIG. 9 shows a schematic configuration of a casting system to which a casting method according to Embodiment 6 of the present invention is applied, and this casting system K
5 is a modification of the temperature measurement mode of the third embodiment, and the rest of the configuration is the same as that of each of the above-described embodiments.

That is, in the casting system K5,
The optical fiber 11 provided with the cooler 30E having the same configuration as that of each of the above-described embodiments and having the exposed tip (temperature measuring portion)
E is supported by a dedicated support mechanism 50,
It is supposed to measure the molten steel temperature.

The supporting mechanism 50 supports the optical fiber 11E via the cooler 30E and also supports the fiber length adjusting mechanism 13E having the same structure as that of the first embodiment.
1 and a column 52 that supports the arm 51.
In addition, the support mechanism 50 attaches the tip of the optical fiber 11E to
A temperature measuring position P _T for measuring the molten steel temperature by immersing the molten steel 2 in a predetermined length (for example, 20 mm), and a retreat position P _E when pouring the molten steel 2 into a mold (not shown), for example.
And a drive mechanism (not shown) for driving the arm 51 so that the arm 51 can be moved between.

In the sixth embodiment, such a drive mechanism drives a horizontal drive shaft (hereinafter referred to as the X-axis) that drives the tip of the optical fiber 11E to move back and forth with respect to the furnace 1E.
And a vertical drive shaft (hereinafter, referred to as Z-axis) that is vertically driven in the vertical direction.

The optical fiber 11E tip portion (temperature measuring portion)
Arm 51 by Z-axis when moving the temperature measuring position P _T
The drive amount of is adjusted according to the position of the molten metal surface H detected by a molten metal surface detector (not shown). At this time, the fiber length adjusting mechanism 13E detects the tip of the optical fiber 11E using a light source switch or the like every time the temperature is measured, so that the immersion length is always constant. Instead of the adjustment method, the optical fiber 11E may be sent out by a predetermined length (for example, 10 mm to 30 mm) to adjust the fiber length.

Thus, the casting system K5 of the sixth embodiment
According to this, for example, the molten steel temperature is intermittently measured at a time interval of a little over 1 minute to suppress the consumption of the optical fiber 11E, save resources and reduce costs, while maintaining an appropriate accuracy (for example, a reference value). Accuracy of high and low about 3 ℃ against temperature)
It becomes possible to measure the temperature of molten steel.

Embodiment 7 FIG. 10 shows a schematic structure of a casting system to which a casting method according to Embodiment 7 of the present invention is applied. This casting system K6 has a temperature measuring mechanism for measuring the molten steel temperature T. It is configured as an independent molten steel temperature measuring device N, and the molten steel temperature T is controlled based on the temperature measurement result.

FIG. 11 shows the arrangement of the mold conveying mechanism 40D and the molten steel temperature measuring device N in the casting system K6. The mold transfer mechanism 40D has a plurality of support arms 41D and is configured so that the respective molds 3E can be sequentially transferred to the furnace 1F for continuous casting. The molten steel temperature measuring device N measures the molten steel temperature T in a predetermined cycle in cooperation with the operation of the mold transport mechanism 40D.

More specifically, the mold transfer mechanism 40D is
For example, four horizontal support arms 41D that support each decompression container 4A in which the mold 3E is set, and a vertical rotation support shaft 42 that supports the horizontal support arms 41D are provided, and each support arm 41D is connected to the rotation support shaft 42. The molds 3E are provided so as to extend radially at every 90 °, and the rotary support shaft 42 is rotated by 90 ° to sequentially feed each mold 3E to the pouring position P ₁ .

Further, the mold 3E is set in the decompression container 4A at the position P ₂ 90 ° before the pouring position P _{1 in} the rotating direction of the rotary support shaft 42 (direction shown by arrow B ₁ in the figure). , The mold 3E is removed from the decompression container 4A at a position (not shown) further 90 ° before the position P ₂ . As a result, in the mold conveying mechanism 40D, it becomes possible to simultaneously perform the steps of setting the mold 3E in the decompression container 4A, casting, and separating the mold.

Next, the molten steel temperature measuring device N will be described.

The molten steel temperature measuring device N comprises a temperature detector 10A and a detector / converter 12A having the same structure as in the above-mentioned respective embodiments.
And a horizontal drive shaft (X-axis) 60 that drives the temperature detector 10A to move forward and backward with respect to the furnace 1F, and the temperature detector 10 in a direction inclined by a predetermined angle from the vertical direction in the same plane as the X-axis.
Vertical diagonal drive axis that drives A (hereinafter referred to as Z ₁ axis) 7
It consists of two linear motion axes of 0.

The X-axis 60 is composed of a slide table 61 slidably provided on the base 4 of the molten steel temperature measuring device N, and an air cylinder for driving the slide table 61 to move back and forth with respect to the furnace 1F. The X-axis actuator 62 is included. Where the X axis 60
Is located at the center of the furnace 1F (point P ₁ ) and the center of the rotary support shaft 42 (point O) so that the molten steel temperature measuring device N is not located directly below the support arm 41D supporting the mold 3E at the pouring position P _1. ) Is provided so as to coincide with a direction deviated by a predetermined angle θ ₁ from the line segment P ₂ O connecting the line). With this configuration, the mold 3E is supported by directly suspending the mold 3E without using a long vertical member on the support arm 41D, and the support arm 41D is moved in parallel in the axial direction of the rotary support shaft 42, so that the mold 3E is moved.
Can be lowered to the bath surface H.

The detector / converter 12A is provided so as to be mounted on the slide table 61, and is a cable bear (registered trademark) 1 made of, for example, a leaf spring.
4 is connected to the temperature detector 10A via various cables.

Next, the Z ₁ axis 70 will be described.

The Z ₁ axis 70 is provided so as to be stretched in a direction coinciding with the drive motor 71, and is driven by the rotation output of the drive motor 71 to drive the temperature detector 10A.
And a driving force transmitting portion 72 formed of, for example, a roller chain that drives the shaft in the axial direction. Here, the temperature detector 10A is a cooler 3 having the same configuration as each of the above-described embodiments.
0F is a linear member externally mounted on the optical fiber 11F so that only the tip (temperature measuring portion) of the optical fiber 11F is exposed, and the connecting member 73 is arranged so that the direction of this straight line coincides with the Z ₁ axis direction. It is fixed to the driving force transmission section 72 by.

Further, each component member 71, 72 of the Z ₁ axis 70
And the temperature detector 10A is supported in a state of being housed in a rectangular parallelepiped box-shaped support portion 75, and the support members 76A and 76B are arranged so that the support portion 75 has its longitudinal direction aligned with the Z ₁ axis direction. It is supported by the slide table 61 via the. Further, each member 7 housed in the support portion 75
In order to protect 1, 72, 10A from the radiant heat of the molten steel 2, a heat insulating material 77 is provided on at least two surfaces of the supporting portion 75 which receive a large amount of heat.

Thus, the molten steel temperature measuring device N having such a configuration
By the operation of each axis 60, 70
Is moved between a predetermined retreat position P ₃ and temperature measurement positions P ₄ , P ₅ . That is, when pouring molten metal into the mold 3E, the temperature detector 10A is moved to the retreat position P _{3 while} being housed in the support 75 so that each part (for example, the support 75) does not obstruct the movement of the mold 3E.

When measuring the temperature, the temperature detector 1 is so arranged that the tip of the optical fiber 11F is immersed in the molten steel 2 for a predetermined length.
OA is moved to the temperature measurement positions P ₄ and P ₅ . At this time, Z
The driving amount of the temperature detector 10A by _one axis is adjusted according to the position of the molten metal surface H detected by a molten metal surface detector (not shown), while the driving amount of the X axis is constant regardless of the position of the molten metal surface H. It is said that That is, the position of the supporting portion 75 during the temperature measurement is constant regardless of the position of the molten metal surface H. The fiber length adjusting mechanism 13F may detect the tip of the optical fiber 11F by, for example, a photoelectric switch and adjust the tip position at each temperature measurement so that the tip position becomes a desired position, or a predetermined length (for example, Optical fiber 11 for each 10 mm to 30 mm
The fiber length may be adjusted by sending F.

Thus, the casting system K of the seventh embodiment is
According to No. 6, for example, the molten steel temperature is intermittently measured at a time interval of about 1 minute or more to suppress the consumption of the optical fiber 11E, save resources and reduce costs, and to obtain appropriate accuracy (for example, , High or low 3 ℃ (± 3
It is possible to measure the molten steel temperature with an accuracy of about ℃).

Further, since the Z ₁ axis 70 is vertically inclined, the retracting distance of the temperature detector 10A when pouring the molten metal into the mold 3E can be minimized, and the takt time can be reduced. It can be shortened. Also, the support portion 7
Depending on the shape of 5 or the like, it is possible to set the withdrawal distance by the X-axis 60 to the length "0". Therefore, the X-axis 60 can be omitted and the structure of the molten steel temperature measuring device N can be simplified to reduce the cost. Will also be possible.

Embodiment 8 FIG. 12 shows a schematic structure of a casting system to which a casting method according to Embodiment 8 of the present invention is applied. This casting system K7 is obtained by modifying the support mechanism 50 of Embodiment 6. The rest of the configuration is the same as that of the sixth embodiment.

That is, the support mechanism 5 of the casting system K7.
In 0A, an arm drive mechanism (not shown) is composed of two axes, a vertical vertical axis and a horizontal rotation axis (Θ axis). In response to this, the optical fiber tip is moved to a temperature measurement position P ₁₁ and a retracted position. P ₁₂
The arm 51A rotates about one vertical axis I so that the arm 51A moves between and.

Thus, the casting system K7 of the seventh embodiment
In the same manner as in Embodiments 6 and 7, the molten steel temperature is intermittently measured at time intervals of, for example, about 1 minute or more,
It becomes possible to measure the molten steel temperature with appropriate accuracy (for example, accuracy of high and low about 3 ° C. with respect to the reference temperature) while suppressing consumption of the optical fiber, saving resources and reducing costs.

Although the present invention has been described based on the embodiments, the present invention is not limited to the embodiments and various modifications can be made. For example, in the embodiment, the present invention is applied to the precision casting by the CLAS method, but it is needless to say that the present invention can be applied to all casting methods that require proper temperature control.

[0075]

As described in detail above, according to the present invention,
The excellent effect that the molten steel temperature can be cast at a temperature according to the casting is obtained.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a casting system to which a casting method according to a first embodiment of the present invention is applied.

FIG. 2 is a schematic diagram showing a method for injecting molten steel into a mold in the casting system.

FIG. 3 is a schematic diagram showing a principle of detecting molten steel temperature by an optical fiber.

FIG. 4 is a schematic diagram showing a schematic configuration of a cooling mechanism.

FIG. 5 is a schematic diagram showing a schematic configuration of a casting system to which the casting method according to the second embodiment of the present invention is applied.

FIG. 6 is a schematic diagram showing a schematic configuration of a casting system to which a casting method according to a third embodiment of the present invention is applied.

FIG. 7 is a schematic diagram showing a schematic configuration of a casting system to which a casting method according to a fourth embodiment of the present invention is applied.

FIG. 8 is a schematic diagram showing a schematic configuration of a casting system to which a casting method according to a fifth embodiment of the present invention is applied.

FIG. 9 is a schematic diagram showing a schematic configuration of a casting system to which a casting method according to a sixth embodiment of the present invention is applied.

FIG. 10 is a schematic diagram showing a schematic configuration of a casting system to which a casting method according to a seventh embodiment of the present invention is applied.

FIG. 11 is a plan view showing an arrangement of each component of the casting system.

FIG. 12 is a schematic diagram showing a schematic configuration of a casting system to which a casting method according to an eighth embodiment of the present invention is applied.

FIG. 13 is a schematic view showing an example of a conventional molten steel temperature measuring method.

[Explanation of symbols]

K casting system M temperature controller N Molten steel temperature measuring device 1 melting furnace 2 Molten steel 3 molds 4 decompression container 10 Temperature detector (temperature detection means) 11 optical fiber 12 Detector / converter 20 Float 30 cooler 40 Mold transfer mechanism 60 horizontal drive shaft 70 Vertical diagonal drive shaft

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshihiko Yokoyama             2-30, Daido-cho, Minami-ku, Nagoya-shi, Aichi             Daido Steel Co., Ltd. Technology Development Laboratory (72) Inventor Akihiko Sato             144 shares at 1642 Eggagawa River, Nakatsugawa City, Gifu Prefecture             Ceremony Company Daidope Precision Parts F term (reference) 2F056 VF01 VF02                 2G066 AC01 BA38 BA42

Claims (10)

[Claims] 1. A permissible width of molten steel temperature with respect to a reference temperature is ±
A casting method in which the temperature is measured at 5 ° C., the output of the melting furnace is adjusted based on the measured temperature, and casting is performed. A casting method characterized by being continuously performed. 2. The allowable range of the molten steel temperature with respect to the reference temperature is ±
A casting method in which the temperature is measured at 5 ° C., and the output of the melting furnace is adjusted based on the measured temperature to perform casting, wherein the measurement uses an optical fiber as a temperature measuring unit, and the tip thereof is on the molten metal surface. A casting method characterized in that the molten steel temperature is measured by immersing the molten steel in a direction oblique to the vertical direction. 3. The allowable range of molten steel temperature with respect to the reference temperature is ±
It is a casting method of measuring at 10 ° C. at a specific timing and adjusting the output of the melting furnace based on the measured temperature to perform casting, wherein the specific timing is when the mold is pulled up from the molten metal surface. And a casting method. 4. The casting method according to claim 1, wherein the molten steel temperature is measured in synchronism with the injection of the molten steel into the mold. 5. A melting furnace for melting a material metal, and a temperature detecting means for detecting a temperature of molten steel melted by the melting furnace,
A temperature control device for controlling the temperature of the melting furnace based on the detection value of the temperature detection means, wherein the temperature detection means is configured to detect the molten steel temperature with desired accuracy. apparatus. 6. The temperature detecting means has an optical fiber as a temperature measuring body, a temperature measuring portion of the optical fiber is covered with a float, and the temperature is detected in a state where the float is floated on the molten metal surface of molten steel. The casting apparatus according to claim 5, wherein: 7. The casting apparatus according to claim 5, wherein the float is fixed to the melting furnace such that the temperature measuring surface of the optical fiber always faces the molten steel. 8. The temperature detecting means has a fiber length adjusting mechanism for unwinding and winding up an optical fiber, and the fiber length adjusting mechanism is mounted on a conveying mechanism for conveying a mold and has the same fiber length. The casting apparatus according to claim 5, wherein the adjustment of the length of the optical fiber by the adjusting mechanism is performed in synchronism with the lifting and lowering of the mold by the conveying mechanism. 9. The temperature detecting means has a fiber length adjusting mechanism for unwinding and winding up the optical fiber, and the fiber length adjusting mechanism moves the temperature measuring portion of the optical fiber between a measuring position and a retracted position. The casting apparatus according to claim 5, wherein the casting apparatus is mounted on a moving mechanism. 10. The casting apparatus according to claim 9, wherein the tip of the optical fiber is constructed so as to be immersed in a direction oblique to the surface of the molten metal.