JPH07286501A - Turbine blade erosion shield brazing device - Google Patents

Abstract

PURPOSE:To facilitate temperature control and ensure good adhesion property of a turbine blade and an erosion shield. CONSTITUTION:In a device for brazing a turbine blade 1 and an erosion shield 2 which are metals to be bonded, temperature of a heating portion is measured by a visual camera during heating by a high frequency heating coil 4b which is moved in parallel with a surface of the turbine blade by a three-dimensional drive device, and a high frequency power supply 4a and the three-dimensional drive device are controlled by a whole controller 7 in which temperature of the heating portion is input so as to control the amount of heating in a brazing part. Furthermore, a variable pressurization type tightening device 6 which pressurizes a portion where a brazing filler metal between the turbine blade 1 and the erosion shield 2 is melted and is provided with a few fixing jigs 6a in the longitudinal direction is provided, and this tightening device 6 is also controlled by the overall controller 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine blade that rotates with a rotor and is embedded in a rotor that is a rotating body for converting thermal energy held by steam into kinetic energy in a steam turbine of a power generation facility. On the other hand, as a countermeasure against erosion due to water droplets or the like, the present invention relates to a turbine blade erosion shield brazing device for brazing a hard metal such as stellite (cobalt alloy) to the blade tip.

[0002]

2. Description of the Related Art An erosion shield for a turbine blade is made by brazing an erosion shield made of a hard alloy matching the curvature of the blade tip.
A conventional brazing device is disclosed in Japanese Patent Publication No. 3-194102. In this, first, the turbine blade is fixed at a predetermined position, and a brazing material is sandwiched between the erosion shield and the turbine blade so as to be tightened with a predetermined tightening force. Next, after fixing the high-frequency heating coil formed to cover the entire brazing part and supplied with electric power from the high-frequency power source to the erosion shield brazing part, power was supplied so as to maintain the brazing temperature for a predetermined time, and the brazing material was used. Was melted by heating the whole, and the erosion shield and the turbine blade were brazed.

[0003]

In the conventional method, the entire brazing range is simultaneously heated by the high-frequency heating coil supplied from the high-frequency power source. Therefore, when the thickness of the brazed portion of the turbine blade erosion shield is thin, the heat capacity is reduced. There is a possibility that unevenness of the heating temperature may locally occur due to the difference of the above. However, it is impossible to feed back the non-uniformity to the heating means for adjustment, and the mechanical properties of the turbine blade material may be deteriorated due to excessive heating, and the brazing material may not be welded due to insufficient heating.

Since many types of turbine blades have a twisted shape, it is necessary to readjust the shape of the high-frequency heating coil and the heating conditions for brazing the erosion shield to the turbine blades having different shapes.

Further, when the brazing filler metal is tightened under a constant load during heating, the brazing filler metal may be heated and the erosion shield may rise, so that air bubbles generated during melting of the brazing filler metal may remain. This is a quality problem because the adhesive strength of is insufficient.

The present invention provides a turbine blade and an erosion shield which have a stable joint strength between the turbine blade and the erosion shield, and have a versatile turbine blade and an erosion shield which have good workability and are of various types. It is an object to provide a brazing device.

[0007]

A first means for solving the above-mentioned problems is to provide a fastening device for fastening an erosion shield to a turbine blade through a brazing material,
An erosion shield brazing device comprising: a heating device that heats a portion where the turbine blade and the erosion shield are fastened to melt the brazing material to bond the erosion shield and the turbine blade, wherein the heating device is the turbine blade. And an erosion shield comprising local heating means for partially heating while moving along the tightened portion, and the tightening device includes a variable pressurizing means for sequentially applying additional pressure to the melted portion of the brazing material. And a non-contact temperature measuring means for measuring the temperature of the heating part heated by the local heating means in a non-contact manner and a heating for controlling the heating device with the output of the non-contact temperature measuring means as an input. Having the control means, the control device controls the temperature of the heating part measured by the non-contact temperature measuring means. When the temperature is lower than a constant lower limit temperature, the heating amount by the heating device is increased, and when the measured temperature of the heating unit is lower than a set upper limit temperature, the heating amount by the heating device is decreased. And

A second means of the present invention for achieving the above object is the turbine blade erosion shield brazing apparatus according to the first means, wherein the variable pressurizing means are a plurality of pressurizers that can press independently of each other. And a pressing control for controlling additional pressing of each pressing means at a position opposite to the determined melting position by determining the melting position of the brazing material with the position of the local heating means as an input. It is characterized by comprising means.

A third means of the present invention for attaining the above object is a tightening device for tightening an erosion shield on a turbine blade through a brazing filler metal, and heating a part where the turbine blade and the erosion shield are tightened to heat the turbine blade and the erosion shield. In an erosion shield brazing device comprising a heating device for melting a brazing material and joining an erosion shield and a turbine blade, the heating device is partially moved while moving along the portion where the turbine blade and the erosion shield are fastened. A rotating shaft drive device for supporting the turbine blade with its longitudinal axis substantially horizontal and rotating the same about the axis, and supporting the local heating means. Three-way drive that moves parallel to the surface of the turbine blade And that the stage is provided, the 3
A movement control means for interlocking and controlling the direction drive means and the rotary shaft drive device is provided; and a non-contact temperature measurement means for non-contactly measuring the temperature of the heating part heated by the local heating means. A heating control means for controlling the heating device with the output of the non-contact temperature measuring means as an input is provided, and the heating control means is such that the temperature of the heating part measured by the non-contact temperature measuring means is a set lower limit temperature. When the temperature is lower, the heating amount by the heating device is increased, and when the measured temperature of the heating unit is lower than the set upper limit temperature, the heating amount by the heating device is decreased.

According to a fourth aspect of the present invention for achieving the above object, in the turbine blade erosion shield brazing device according to the third means, the tightening device sequentially applies pressure to the molten portion of the brazing material. The variable pressure means may be included, the variable pressure means may include a plurality of pressure means capable of independently applying pressure, and the position of the local heating means may be used as an input. It is characterized by comprising a pressing control means for judging the melting position of the material and controlling so as to pressurize each pressing means at a position facing the judged melting position.

A fifth means of the present invention for achieving the above object is characterized in that, in any one of the first to fourth means, the local heating means is a high frequency heating coil.

[0012]

According to the first means, the joint between the turbine blade and the erosion shield is sequentially heated by the local heating means for heating while moving, and the temperature of the heated portion of the turbine blade is measured by the non-contact temperature measuring means. It The heating amount of the local heating means is controlled by the heating control means with the temperature of the heated portion measured by the non-contact temperature measuring means as an input. In the control, the heating amount of the local heating means is controlled so that the heating amount is increased when the temperature of the heating portion is lower than the set lower limit temperature and is decreased when the temperature of the heating portion is higher than the setting upper limit temperature. Therefore, even if the heat capacity of the brazing part varies depending on the position of the heating part, the amount of heating is increased or decreased so that the brazing part is heated to the specified temperature range, and the mechanical properties deteriorate due to insufficient melting of the brazing material or overheating. The occurrence of defects can be avoided. Further, since the erosion shield of the portion where the brazing material is melted is additionally pressed against the turbine blade by the variable pressurizing means, it is possible to avoid leaving bubbles in the molten brazing material, It is possible to avoid a decrease in strength.

According to the second means, the pressing control means causes the plurality of pressing means constituting the variable pressurizing means to sequentially perform additional pressurization based on the position of the local heating means.
Additional pressure is applied immediately after melting the brazing material, avoiding additional pressing after the brazing material has solidified.

According to the third means, the movement control means controls the three-way driving means and the rotary shaft driving device in association with each other. That is, even if the surface of the turbine blade is twisted, in accordance with the turbine blade longitudinal movement of the local heating means, so that the surface of the turbine blade at a position facing the local heating means is parallel to the surface of the local heating means,
The turbine blades are rotated by the rotary shaft driving device, and the movement control means sets the distance between the surface of the turbine blades and the surface of the local heating means to be a predetermined distance.
The directional drive means is controlled. As a result, the local heating means moves in parallel with the surface of the turbine blade at a predetermined interval, which facilitates control of the heating temperature.

According to the fourth means, as the local heating means moves, the pressing control means considers that the brazing material at the position of the local heating means has melted and opposes the local heating means with the turbine blade interposed therebetween. The pressing means at the position to be controlled controls to sequentially press the erosion shield. Therefore, as the brazing filler metal is heated and begins to melt, additional pressure is applied at the same time, so that the molten brazing filler metal is immediately spread thinly between the erosion shield and the turbine blade.
Occurrence of defects such as bubbles remaining therein can be avoided.

According to the fifth means, since the local heating means is composed of the heating coil utilizing high frequency, the heating amount can be easily increased / decreased and increased / decreased in a short time. Basically, the heat of the heating means itself is not used for heating, so there is no resistance to increase or decrease of heat,
Easy to control.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a turbine blade erosion shield brazing apparatus of the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5 and 6. FIG. 1 is a perspective view of an embodiment of an erosion shield brazing device of the present invention, and FIGS. 2 and 3 are perspective views of essential parts showing a state in which the erosion shield of the turbine blade shown in FIG. 1 is tightened.
Is a construction flowchart of turbine blade erosion shield brazing, and FIG. 5 is an explanatory view of an additional pressurizing mechanism.

The erosion shield brazing device shown in FIG. 1 has a rotary shaft driving device 3a for supporting both ends of the turbine blade 1 in the longitudinal direction, and a variable pressurizing means supported by the rotary shaft driving device 3a. A tightening device 6, a high-frequency heating coil 4b that is a local heating means, a Y-axis driving device 3c that supports the high-frequency heating coil 4b and moves it back and forth (Y-axis direction), and the Y-axis driving device 3c. Z-axis drive device 3b that supports the Y-axis drive device 3c and moves it up and down (Z-axis direction) by supporting the visual cameras 5a and 5b that move forward and backward together with the high-frequency heating coil 4b.
An X-axis driving device 3d that supports the Z-axis driving device 3b and moves it in the left-right direction (X-axis direction), a high-frequency power source 4a that supplies high-frequency power to the high-frequency heating coil 4b, and the high-frequency power source 4a, The rotary shaft driving device 3a, the Y-axis driving device 3c, the Z-axis driving device 3b, the X-axis driving device 3d, and the overall control device 7 that controls the tightening device 6 are included. The overall control device 7 includes visual cameras 5a and 5b.
Is also taken in as an input for control, and it also serves as a heating control means, a pressing control means, and a movement control means.

Z-axis drive unit 3b, Y-axis drive unit 3c, X
The shaft driving device 3d constitutes a three-way driving means, and together with the rotary shaft driving device 3a constitutes a three-dimensional driving device 3 as a whole. The visual camera is an upper visual camera 5 that detects the temperature of the upper surface of the locally heated portion of the turbine blade 1 in a non-contact manner.
a and a lower visual camera 5b that detects the temperature of the lower surface of the locally heated portion in a non-contact manner, each having a non-contact temperature measuring mechanism.

The turbine blade 1 is positioned and fixed to a rotary shaft driving device 3a having an axis A as a rotary axis so that the longitudinal direction thereof is aligned with the axis A so as to be substantially horizontal, and the turbine blade 1 and the erosion shield 2 which are the metals to be welded. As shown in FIGS. 2 and 3, they are fastened to each other via an insert-shaped brazing material 8 having an area covering the entire joint. The rotating shaft drive device 3a is provided with a tightening device 6 such as an electro-pneumatic conversion pressurizing device having a variable pressurizing means for additionally pressurizing a portion where the brazing material 8 is melted and the turbine blade 1 and the erosion shield 2 are adhered. ing. As shown in FIG. 2, the tightening device 6 is provided with fixing jigs 6a forming m pressing means arranged at equal intervals, and the fixing jigs 6a serve as turbine blade tips (front edges). The erosion shield 2 is brought into contact with the erosion shield 2
Is pressed against the turbine blade 1 via the brazing material. Each fixing jig 6a is given a number of 1 to m in order from the side where heating is started, and each fixing jig 6a is configured to be able to independently press the erosion shield 2 with different force or press with the same force. ing. In addition, the fixing jig 6a
The part that comes into contact with the erosion shield 2 is bifurcated and has an S-shaped joining surface (brazing surface)
The pressing force can be applied as vertically as possible.

The local heating means composed of the high frequency heating coil 4b supplied with power from the high frequency power source 4a is supported by the Y axis drive unit 3c so as to be movable back and forth in the Y axis direction, and as shown in FIG. 3, the erosion shield brazing section. Positioned immediately below 8. The width of the high-frequency heating coil 4b in the X-axis direction (longitudinal direction of turbine blade) is 70 mm in this embodiment, and the brazing portion is heated from below while moving in the X-axis direction. The turbine blade 1 has various lengths, but a long one has a length close to 1 m. In the Y-axis drive device 3c, as described above, the upper visual camera 5a having a non-contact temperature measurement mechanism that measures the surface temperature of the turbine blade during brazing and feeds it back to the overall control device 7 has a high-frequency heating coil. It is attached so as to synchronize with 4b.

The temperature control is performed by the image processing means of the visual camera 5 which is a non-contact temperature measuring means, detects the light radiated by the temperature rise of the brazing portion, and the heating portion of the turbine blade 1 by the high frequency heating coil 4b. The temperature of is always detected. The detection result is sent to the overall control device 7, and it is determined whether or not the measured temperature detected and output by the upper visual camera 5a is appropriate on the basis of the brazing construction temperature Tave, and the determination result is the feed speed of the three-dimensional drive device 3. It is also fed back to the input voltage of the high frequency power supply 4a. The output of the lower visual camera 5b is used to confirm whether the temperature control performed by the feedback of the output of the upper visual camera 5a is properly performed. In this example,
The upper visual camera is used for control and the lower visual camera is used for confirmation, but they may be reversed.

The tightening device 6 includes the erosion shield 2
Erosion shield 2 so that the load is evenly applied to the
Is composed of a plurality of fixing jigs 6a arranged at equal intervals on the longitudinal direction line, and the erosion shield 2 is uniformly pressed by a constant load at the start of heating. While heating
As the high-frequency heating coil 4b moves, the fixing jig 6a sequentially applies pressure to the portion where the brazing material 8 melts and the turbine blade 1 and the erosion shield 2 are adhered to improve the adhesion between the turbine blade 1 and the erosion shield 2. Let In this embodiment, the pressure applied to the fixing jig 6a is doubled at the stage where the brazing material 8 immediately below each fixing jig 6a is melted, and is maintained at the increased pressure until the end of brazing. However, the pressurizing pressure may be sequentially reduced at the stage when the brazing material 8 immediately below each fixing jig 6a is cooled and solidified. Control is simple when the increased pressure is maintained until the end of brazing, but when the brazing material 8 immediately below each fixing jig 6a is cooled and solidified, the pressurizing pressure is successively decreased. The complexity of control increases depending on how the confirmation of solidification is performed. In this embodiment, when the high-frequency heating coil 4b comes directly under each fixing jig 6a, the overall control device 7 controls to increase the pressure applied to the fixing jig.

Next, the construction flow of erosion shield brazing will be described with reference to FIG. Both ends of the turbine blade 1 in the longitudinal direction are supported by the rotary shaft driving device 3a such that the longitudinal axis of the turbine blade 1 is substantially horizontal.
Before the automatic operation, as shown in FIG. 2, the erosion shield 2 is arranged and positioned by sandwiching the brazing material at the position where the countermeasure for erosion of the front edge of the turbine blade 1 should be taken, and the fixing jig 6a of the tightening device 6 is positioned. To evenly pressurize with a predetermined load. Next, the all-axis interlocking three-dimensional driving device 3 is manually operated so that the interval l between the turbine blade 1 which is a curved metal to be welded, the erosion shield 2 and the high frequency heating coil 4b becomes constant in advance. The high-frequency heating coil 4b attached to the shaft driving device 3c is moved in the longitudinal direction of the erosion shield 2, and the turbine blade 1 is rotated by the rotation shaft driving device 3a.
Teaching data is set in the overall control device 7 (step 401).

After setting the teaching data, the high-frequency heating coil 4b is positioned immediately below the longitudinal end portion (root side or tip side of the turbine blade 1) of the erosion shield brazing portion. In this state, the operator instructs the general control device 7 to start automatic operation, and the automatic operation of the device is started.

First, a heating signal is output from the overall control device 7, and the high frequency heating coil 4 supplied from the high frequency power source 4a is supplied.
Heating is started by b (procedure 402). When the heating is started, the temperature detection of the brazing part by the visual cameras 5a and 5b is started. The visual cameras 5a and 5b are arranged so as to detect the surface temperature of the turbine blade at the position heated by the high frequency heating coil 4b. When the brazing part (turbine blade) at the heating start position rises in temperature and the temperature detected by the visual camera 5a reaches the brazing set temperature Tave (procedure 403), the overall control device 7 causes the three-dimensional drive device 3 to generate high frequency waves. A heating coil 4b movement command is issued. The movement command is based on the teaching data, and the rotary shaft driving device 3a and the Z-axis driving device 3 that constitute the three-dimensional driving device 3 are used.
b, Y-axis driving device 3c, and X-axis driving device 3d, respectively, and the high-frequency heating coil 4b moves in a plane parallel to the heated surface of the turbine blade 1 while keeping a constant distance from the heated surface. (Procedure 404). In the present embodiment, the high-frequency heating coil 4b moves continuously, but intermittent movement may be possible if the stop interval is reduced to 1/10 or less of the heating width of the high-frequency heating coil 4b. Further, in order to follow the change in the twist angle of the turbine blade 1, the turbine blade 1 is rotated around the axis A by the rotary shaft driving device 3a as the high-frequency heating coil 4b moves in the X-axis direction. Instead of rotating 1, the angle formed with the horizontal plane of the Y-axis drive device 3c may be changed so as to follow the change in the twist angle of the turbine blade 1.

While the high-frequency heating coil 4b is moving, the heating temperature T is measured by the upper visual camera 5a which constantly controls the temperature immediately above the heating portion of the erosion shield 2 (step 405), and the overall control device 7 brazes it. The set upper limit temperature Tmax and the heating temperature T are compared (step 40).
6). If T ≧ Tmax is detected as a result of comparison, an overheating signal is output from the overall control device 7 to increase the set feed speed of the three-dimensional drive device 3 or the high frequency power supply 4a.
The heating electric power sent from the
7), then go to step 408. As a result of the comparison in step 406, if T <Tmax is detected, the process proceeds to step 408. In step 408, the brazing setting lower limit temperature Tmin is compared with the heating temperature T, and if Tmin ≧ T is detected, a heating insufficient signal is output from the overall control device 7 and the setting feed of the three-dimensional drive device 3 is performed. Reduced speed or high frequency power supply 4a
After the amount of heating power sent from is increased (409), the process proceeds to step 413. When Tmin <T is detected in step 408, the process directly proceeds to step 413.

As a sub temperature control, the lower visual camera 5b independently detects the temperature of the portion that is most easily heated during heating separately from the upper visual camera 5a, and the temperature control based on the data fed back from the visual camera 5a is performed. It is used to confirm that it is being carried out correctly.
When the temperature detected by the lower visual camera 5b deviates from the preset temperature range, the overall control device 7 outputs an alarm and calls the operator's attention. This temperature control is repeated until the brazing is completed.

When the movement of the high frequency heating coil 4b is started, the overall control device 7 samples the moving distance L of the high frequency heating coil 4b from the heating start point at a predetermined time interval (procedure 410) and obtains it. Compare the distance L _N of each fixing jig 6a from the heating start point (N = 1 to m, 1 to m are numbers of the fixing jig 6a and are sequentially numbered from the side closer to the heating start position) (Procedure 411). As shown in FIG. 5, when the moving distance L of the high frequency heating coil 4b becomes larger than any one of the distances L _N , the overall control device 7 sends a signal to the tightening device 6, and the corresponding fixing jig 6a is The pressing force Pa in the state of being uniformly pressed at the time of starting heating of the high-frequency heating coil 4b is secondarily additionally pressurized to Pb, and the pressing pressure Pb is maintained until brazing is completed (step 412). . 6A shows the state of pressing force of the fixing jig 6a at the start of heating, that is, when the moving distance L is Lo (= 0), and FIG. 6B shows the state when the high frequency heating coil 4b is fixed. The distribution of the pressing force of the jig 6a is shown in FIG.
(C) shows the distribution of the pressing force of the fixing jig 6a at the end of heating. After step 412 is completed, the procedure proceeds to step 413, and the overall control device 7 determines whether or not brazing is completed. Further, in the comparison of step 411, if there is no new fixing jig 6a whose distance L _N is smaller than the moving distance L, the process directly proceeds to step 413. If the result of determination in step 413 is that brazing has not ended, the procedure returns to step 404, and the above procedure is repeated at predetermined time intervals until brazing ends. When it is determined in step 413 that the entire brazing area has been heated, a completion signal is output and the movement and heating of the high frequency heating coil 4b are stopped.

According to the present embodiment, the deterioration of the mechanical properties of the turbine blade material due to overheating and the occurrence of unwelding of the brazing material due to insufficient heating are eliminated, and the construction temperature can be easily controlled, and the erosion shield rises due to heating. The effect of being able to be applied under the same conditions to various types of erosion shields having a twisted shape can be obtained by preventing the occurrence of bubbles remaining during melting of the brazing material, improving quality and reliability.

In the above embodiment, the high frequency heating coil 4b is moved based on the teaching data preset in the overall controller 7, but the high frequency heating coil 4b detects the distance from the surface of the turbine blade 1. A proximity sensor may be provided, and the three-dimensional drive device 3 may be driven based on the signal from the proximity sensor.

[0032]

According to the present invention as set forth in claim 1, the turbine blade material is overheated by heating while moving the local heating means and controlling the heating temperature by using the non-contact temperature measuring means. Since the occurrence of unwelded brazing filler metal due to loss of mechanical properties and insufficient heating can be done easily, construction temperature control can be performed easily.By applying additional pressure to the portion where the brazing filler metal melts and the turbine blade and erosion shield adhere, Effects such as prevention of floating of the erosion shield and elimination of air bubbles generated during melting of the brazing material and improvement of quality and reliability can be obtained.

According to the present invention described in claim 2, in addition to the effect of the invention described in claim 1, the variable pressurizing means is composed of a plurality of pressurizing means which can pressurize independently of each other. Since the pressing control means for sequentially and additionally applying pressure to the melted portion of the material is provided, it is possible to further prevent the floating of the erosion shield and the prevention of residual bubbles generated during melting of the brazing material.

According to the third aspect of the present invention, the local heating means can be heated while moving in parallel with the surface of the turbine blade, and can be applied under the same conditions to various kinds of twisted erosion shields. By controlling the heating temperature using a non-contact temperature measuring means, the loss of mechanical properties of the turbine blade material due to overheating and the occurrence of unwelded brazing material due to insufficient heating can be eliminated and the construction temperature can be easily controlled. , Etc. can be obtained.

According to the invention of claim 4, claim 3
In addition to the effect according to the invention described in (1), the variable pressurizing means is composed of a plurality of pressurizing means that can pressurize independently of each other, and the press control means for sequentially and additionally pressurizing the molten portion of the brazing filler metal is provided. Therefore, it is possible to further prevent the floating of the erosion shield and the remaining of the bubbles generated when the brazing material is melted.

According to the invention of claim 5, claim 1
In addition to the effects of the invention described in any one of 4 to 4, the heating amount can be easily increased and decreased, the response to the control is quick, and the heating amount can be easily controlled.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an erosion shield brazing device of the present invention.

FIG. 2 is a perspective view of relevant parts showing a state in which an erosion shield of the turbine blade shown in FIG. 1 is tightened.

3 is a perspective view of an essential part showing a state in which an erosion shield of the turbine blade shown in FIG. 1 is tightened as in FIG. 2.

FIG. 4 is a construction flowchart of erosion shield brazing of the present invention.

5 is a perspective view for explaining a part of the embodiment shown in FIG.

FIG. 6 is a conceptual diagram illustrating the relationship between the position of additional pressurization and the moving distance of the high frequency heating coil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 turbine blade 2 erosion shield 3 three-dimensional drive 3a rotary axis drive 3b Z axis drive 3c Y axis drive 3d X axis drive 4 heating source 4a high frequency power supply 4b high frequency heating coil 5a upper visual camera 5b lower visual camera 6 Tightening device 6a Fixing jig 7 Overall control device 8 Brazing material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F04D 29/38 G (72) Inventor Masami Iizuka 502 Kintatemachi, Tsuchiura-shi, Ibaraki Hiritsu Manufacturing Co., Ltd. Inside the mechanical laboratory

Claims (5)

[Claims] 1. A tightening device for tightening an erosion shield on a turbine blade through a brazing material, and a portion where the turbine blade and the erosion shield are tightened to heat the brazing material to bond the erosion shield and the turbine blade. In an erosion shield brazing device comprising a heating device, the heating device comprises a local heating means for partially heating while moving along the portion where the turbine blade and the erosion shield are clamped, The tightening device includes variable pressurizing means for sequentially applying additional pressure to the melted portion of the brazing filler metal, and non-contact for measuring the temperature of the heating portion heated by the local heating means in a non-contact manner. The heating device with the outputs of the temperature measuring means and the non-contact temperature measuring means as inputs A heating control means for controlling the heating amount, the heating control means increasing the amount of heating by the heating device when the temperature of the heating part measured by the non-contact temperature measuring means is lower than the set lower limit temperature, A turbine blade erosion shield brazing device, which is configured to reduce the amount of heating by the heating device when the temperature of the part is lower than a set upper limit temperature. 2. The variable pressurizing means comprises a plurality of pressurizing means that can pressurize independently of each other, and determines the melting position of the brazing material by inputting the position of the local heating means to the determined melting position. 2. The turbine blade erosion shield brazing apparatus according to claim 1, further comprising a pressing control unit that controls each pressing unit at an opposing position so as to apply additional pressure. 3. A tightening device for tightening an erosion shield on a turbine blade via a brazing filler metal, and a portion where the turbine blade and the erosion shield are clamped is heated to melt the brazing filler metal to bond the erosion shield and the turbine blade. In an erosion shield brazing device comprising a heating device, the heating device comprises a local heating means for partially heating while moving along the portion where the turbine blade and the erosion shield are clamped, A rotary shaft drive for supporting the turbine blade with its longitudinal axis substantially horizontal and rotating about the axis, and a three-way drive means for supporting the local heating means and moving them in parallel to the surface of the turbine blade. Is provided, and the three-direction drive A moving control means for controlling the moving means and the rotary shaft driving device in an interlocking manner, and a non-contact temperature measuring means for measuring the temperature of the heating part heated by the local heating means in a non-contact manner, The heating control means is provided for controlling the heating device by using the output of the contact temperature measuring means as an input, and the heating control means is such that the temperature of the heating portion measured by the non-contact temperature measuring means is lower than a set lower limit temperature. When the temperature is low, the heating amount by the heating device is increased, and when the measured temperature of the heating unit is lower than the set upper limit temperature, the heating amount by the heating device is decreased, and the turbine blade is characterized in that Erosion shield brazing device. 4. The tightening device comprises variable pressure means for sequentially applying pressure to the molten portion of the brazing material, and the variable pressure means is a plurality of pressure means that can independently apply pressure to each other. Including the individual pressing means, the position of the local heating means is used as an input to determine the melting position of the brazing material, and the pressing control is performed to apply additional pressure to each pressing means at a position opposite to the determined melting position. 4. A turbine blade erosion shield brazing apparatus according to claim 3, comprising means. 5. The turbine blade erosion shield brazing device according to claim 1, wherein the local heating means is a high frequency heating coil.