JP2671531B2 - Turbine blade erosion shield brazing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is, for example, in a portion where geothermal steam hits a turbine blade (hereinafter referred to as a leading edge portion), such as a steam turbine used in a geothermal power generation facility, The present invention relates to an erosion shield material brazing device for a turbine blade, which brazes a hard erosion shield material having wear resistance and corrosion resistance.

[Conventional technology]

Turbine blade erosion shields have traditionally included the desired proportions of hard wear and corrosion resistance, such as cobalt, chromium, tungsten and other metallic elements, at the leading edge of the turbine blade, which match the curvature of the leading edge. This is done by brazing an erosion shield material made of a steel alloy (Stellite (trademark)). That is, the erosion shield material is sandwiched between the front edges of the turbine blades with a plate-shaped silver brazing material, and the erosion shield is placed at a desired position by a tightening mechanism such as a C-shaped frame and a tightening screw such as a commercially available vise vise. The material was tightened, gas-heated at a temperature lower than the quenching temperature of the turbine blade to melt the silver solder, and the erosion shield material was brazed to the leading edge of the turbine blade.

[Problems to be solved by the invention]

Conventionally, the erosion shield material is sandwiched and clamped through a silver brazing material by a fixing mechanism such as a vise, but since the thickness of the silver solder changes as the silver solder melts, the tightening force changes. It is difficult to control the tightening force. Moreover, since the silver solder is melted by manual gas heating, working conditions such as control of heating temperature and heating time are severe. Conventionally, the maintenance of this working condition depends on the skill of the worker, but it is difficult to gather a large number of such skilled workers, which is a bottleneck in manufacturing the turbine blade.

In addition, since there are many types of turbine blades, there are many types of turbine blades. Therefore, in order to perform erosion shielding for one turbine in a short period of time, many workers must tighten the erosion shield material and braze it with gas heating. At this time, if an unskilled worker works instead of a skilled worker, defective brazing such as floating of the erosion shield material due to improper fastening of the erosion shield material to the turbine blade or improper heating. However, there is a problem that the brazing work has to be performed again or the turbine blade that has been subjected to the bending process must be discarded as a defective product.

The present invention solves the above-mentioned problems of the prior art, and when brazing the erosion shield material of the turbine blade, the pressing force hardly changes even when the silver brazing material melts and the thickness of the silver brazing material changes. An object of the present invention is to provide a brazing device for an erosion shield material for a turbine blade, which is easy and which can easily maintain working conditions such as control of heating temperature and heating time for melting silver solder.

[Means for solving the problem]

In order to solve the above problems, the present invention provides a fixing base for positioning and fixing a turbine blade at a desired position, and a high-frequency heating coil arranged near the erosion shield part of the turbine blade and supplied with a high-frequency power source. And a turbine blade erosion shield material brazing device comprising a tightening mechanism for pressurizing an erosion shield material arranged with a brazing material sandwiched between the erosion shield parts of the turbine blade with a desired tightening force, The tightening mechanism is a toggle mechanism attached to the fixed base via a mounting base, a pressing tool for pressing the erosion shield material against the turbine blade, and one end of which is connected to the handle of the toggle mechanism and the other end is The pressing tool comprises a leaf spring mechanism connected to the pressing tool. V to be brought into contact with John shield material
At least one block having a shaped recess; and a holder for rotatably supporting the block via a pin,
The other end of the leaf spring mechanism is connected to the holder included in the pressing tool.

[Action]

The present invention positions a turbine blade at a desired position and fixes it to a fixed base, sandwiches a brazing material in the erosion shield part of the turbine blade, and presses the erosion shield material with a desired tightening force by a tightening mechanism. Tightening, brazing by high frequency heating, even if the thickness of the wax melts and changes the thickness of the wax, the tightening force is maintained as it is, so no defective brazing products such as floating erosion shield material will occur. The heating temperature and heating time can be easily controlled by high-frequency heating.

〔Example〕

An embodiment of a brazing apparatus for an erosion shield material for a turbine blade according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing an embodiment of an erosion shield material brazing apparatus of the present invention, and FIG. 2 is a view showing a state in which the erosion shield material is fastened to the erosion shield portion of the turbine blade shown in FIG. FIG.

In these figures, the turbine blade 1 is positioned and fixed to a fixed base 2 on a flat plate. That is,
On the fixed base 2, the turbine blade 1 is supported on a support block (not shown) mounted at a desired position below the turbine blade 1 on the fixed base 2, and the L-shaped block 3a mounted on the fixed base 2 is supported. The positioning mechanism 4 composed of 3 and 3b positions the turbine blade 1 so that the front edge portion 1a and the head portion 1b of the turbine blade 1 are brought into contact with each other, and is a commercially available punch vise composed of a C-shaped frame 5 and a tightening screw 6. The turbine blade 1 thus positioned is fixed to the fixed base 2 by the fixing mechanism 7 attached to the fixed base 2.

On the other hand, the high-frequency heating coil 8 is arranged in the vicinity of the erosion shield part 1c of the turbine blade 1 at a position capable of high-frequency heating by a support tool (not shown), and the high-frequency heating coil 8 is connected to the high-frequency power supply device 9. Be prepared to receive power.

The pressing tool 14 for pressing the erosion shield material 20 against the erosion shield part 1c with the brazing material 19 sandwiched therebetween is composed of a plurality of blocks 11 provided with the V-shaped recesses 10. It is rotatably supported on. This pressing tool 14 is connected to a handle 17 of a toggle mechanism mounted by a mounting base 16 of I-shaped steel via a leaf spring mechanism 15 as a pressurizing device, and by these, a tightening mechanism 18
Is configured.

As described above, in the turbine blade 1 which is positioned and fixed and has the high-frequency heating coil 8 arranged therein, the brazing material 19 is sandwiched between the erosion shield parts 1c, the erosion shield material 20 is arranged, and the pressing tool 14 V of multiple blocks 11
Abut the shaped recess 10 and operate the handle 17 to move the leaf spring mechanism.
The pressing tool 14 is pressurized via 15 and the erosion shield material 20 is tightened to the turbine blade 1 by the tightening mechanism 18 composed of these.

The high-frequency heating coil 8 is supplied with power from the high-frequency power supply device 9 to heat the vicinity of the erosion shield part 1c with high frequency, whereby the braze 19 is melted and the erosion shield material 20 is urged via the leaf spring mechanism 15. Therefore, the tightening mechanism 18 continues tightening without moving, and the high-frequency heating coil 8 is de-energized and cooled.
Is solidified, and the adhesion of the erosion shield material 20 is completed.

The block 11 of the pressing tool 14 can freely rotate about the pin 12 as a center of rotation, the V-shaped recess 10 can abut on any curved surface, and the pressure can be applied via the leaf spring mechanism 15. The outer peripheral surface of many types of erosion shield materials 20 having different surfaces can be tightened with a uniform tightening force.

The turbine blade erosion shield material brazing device of the present invention can accurately and easily braze the erosion shield material to the erosion shield portion of the turbine blade.

〔The invention's effect〕

The present invention provides a fixing base for positioning and fixing a turbine blade at a desired position, a high-frequency heating coil arranged near the erosion shield part of the turbine blade and supplied with a high-frequency power source, and an erosion shield for the turbine blade. An erosion shield material brazing device for a turbine blade, comprising a tightening mechanism for pressurizing an erosion shield material with a brazing material sandwiched between the parts with a desired tightening force, wherein the tightening mechanism comprises a mounting base. A toggle mechanism attached to the fixing base via a pressing tool for pressing the erosion shield material against the turbine blade, and a plate having one end connected to the handle of the toggle mechanism and the other end connected to the pressing tool. A spring mechanism, and the pressing tool contacts the erosion shield material. At least one block having a V-shaped recess and a holder for rotatably supporting the block via a pin are provided, and the other end of the leaf spring mechanism is connected to the holder provided for the pressing tool. Since the high-frequency heating coil is energized to melt the braze and then the energization is stopped, the brazing is performed by cooling and high-frequency heating, so that a large number of skilled workers are not required as in the prior art,
Even an unskilled operator can easily and quickly perform brazing work of the same quality, and can cope with erosion shield material brazing of many types of turbine blades having different sizes and shapes.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an erosion shield material brazing apparatus of the present invention, and FIG. 2 is a view showing a state in which the erosion shield material is fastened to the erosion shield portion of the turbine blade shown in FIG. FIG. 1: Turbine blade, 1a: Front edge part, 1b: Head part, 1c: Erosion shield part, 2: Fixing stand, 4: Positioning mechanism, 7: Fixing mechanism, 8: High frequency heating coil, 14: Pressing tool, 15 : Leaf spring mechanism, 18: Tightening mechanism, 19: Wax, 20: Erosion shield material.

Claims (1)

(57) [Claims] 1. A fixing base for positioning and fixing a turbine blade at a desired position, a high-frequency heating coil disposed near an erosion shield portion of the turbine blade and supplied with a high-frequency power, and an erosion of the turbine blade. An erosion shield material brazing device for a turbine blade, comprising a tightening mechanism for pressurizing an erosion shield material sandwiched in a shield part with a desired tightening force, wherein the tightening mechanism is a mounting base. A toggle mechanism attached to the fixed base via a pressing tool for pressing the erosion shield material against the turbine blade, one end of the handle of the toggle mechanism and the other end of the pressing tool. It consists of a leaf spring mechanism, and the pressing tool contacts the erosion shield material. At least one block having a V-shaped recess and a holder for rotatably supporting the block via a pin, and the other end of the leaf spring mechanism is connected to the holder provided for the pressing tool. A brazing apparatus for turbine blade erosion shield material.