A turbine blade laser cladding detection device and detection method

Abstract

The application provides a turbine blade laser cladding detection device which can be used for detecting a laser cladding area of a blade, is convenient to use, guarantees cladding quality, and simultaneously provides a detection method using the detection device. The device comprises a cladding groove shape sample plate, a cladding area repair sample plate and a cladding area thickness sample plate. The cladding groove shape sample plate comprises a cladding groove profile measuring surface which corresponds to a cladding groove profile of a standard part. The cladding area repair sample plate comprises a contour positioning surface one, a contouring groove one and a cladding area profile measuring surface one which corresponds to a shape of a semi-finished product cladding area standard part. The cladding area thickness sample plate comprises a contour positioning surface two, a contouring groove two and a cladding area profile measuring surface two which corresponds to the shape of the semi-finished product cladding area standard part.

Description

Technical Field

[0001] The present invention relates to the technical field of blade processing, and in particular to a device and method for detecting laser cladding of turbine blades. Background Art

[0002] The working environment of the last-stage blades of a steam turbine is steam. During high-speed operation, the last-stage blades are easily affected by water droplets and water vapor in the steam under the action of rotational speed and centrifugal force, resulting in water erosion at the steam inlet edge of the blade tip. Water erosion affects the output power and service life of the entire unit. At the same time, the risk of blade fracture will endanger the safe operation of the entire unit. Laser cladding, as the most advanced laser surface strengthening method currently, has been applied in batches on the last-stage blades of multiple units. Its principle is to melt the Stellite alloy powder through laser and rapidly cool it to form a metallurgical bond with the blade substrate, and use the high hardness and high wear resistance of the Stellite alloy to improve the water erosion resistance of the steam inlet edge of the blade.

[0003] As disclosed in the invention entitled "A Process for Preventing Corrosion of Steam Turbine Blades by Laser Cladding" with publication number CN103659201A, the milling of cladding grooves, cladding of Stellite alloy, correction, repair welding, and polishing in the laser cladding process all involve controlling the size of the cladding area. Specifically, when milling the cladding grooves, the cladding area is combined with the cladding area. Figure 1 ,Will Figure 1 The shadowed part is milled off to get the cladding groove. Figure 2 , Figure 2 The shaded area in the middle is the alloy clad on the cladding groove. After the alloy is clad, the cladding area is obtained. After the cladding area is polished, the semi-finished cladding area is obtained. The final product is as follows Figure 3 As shown in the figure, the excess part of the blade is milled off and the surface is treated to obtain the finished cladding area. Due to the difficulties of the cladding surface such as poor surface quality, high hardness, and difficulty in cutting and grinding, the detection and process control methods of the cladding area are key factors in determining the process capability and quality of laser cladding. Summary of the Invention

[0004] In response to the problem of needing a set of detection devices to detect the laser cladding area of ​​the blade, the present invention provides a turbine blade laser cladding detection device, which can be used for detecting the laser cladding area of ​​the blade, is easy to use, ensures the cladding quality, and also provides a detection method using this detection device.

[0005] The technical scheme is as follows: a turbine blade laser cladding detection device, characterized in that: it comprises a cladding groove shape sample plate, a cladding area repair sample plate and a cladding area thickness sample plate; the cladding groove shape sample plate comprises a cladding groove profile measurement surface, which corresponds to the cladding groove profile of a standard part; the cladding area repair sample plate comprises a profile positioning surface one, a line matching groove one and a cladding area profile measurement surface one, the profile positioning surface one is used for positioning a blade and is attached to one surface of a blade profile, and the cladding area profile measurement surface one corresponds to the shape of a semi-finished product cladding area standard part; the cladding area thickness sample plate comprises a profile positioning surface two, a line matching groove two and a cladding area profile measurement surface two, the profile positioning surface two is used for positioning a blade and is attached to another surface of a blade profile, and the cladding area profile measurement surface two corresponds to the shape of a semi-finished product cladding area standard part.

[0006] It is further characterized in that:

[0007] It further comprises a cladding area line marking sample block, which comprises sharp edges used for marking lines on an inner arc surface and a back arc surface of a blade profile to be processed;

[0008] The cladding area line marking sample block comprises a line marking groove in the middle of the cladding area line marking sample block, an inner side surface of the line marking groove is an inlet side positioning surface, the inlet side positioning surface is used for contacting an inlet edge of a blade to be processed, and the line marking groove is provided with the sharp edges at both ends;

[0009] It further comprises a cladding repair sample plate, which comprises a cladding area profile measurement surface three, and the cladding area profile measurement surface three corresponds to the shape of a finished product cladding area standard part;

[0010] The profile of the cladding area profile measurement surface one contains the cladding area profile of the semi-finished product cladding area standard part, and the distances between corresponding points between them are equal; the profile of the cladding area profile measurement surface two contains the cladding area profile of the semi-finished product cladding area standard part, and the distances between corresponding points between them are equal.

[0011] A turbine blade laser cladding detection method, characterized in that: the above-mentioned turbine blade laser cladding detection device is used for detection, which comprises the following steps: one, line marking; the inlet edge of a blade to be processed is contacted with the inlet side positioning surface of the cladding area line marking sample block, and the inner arc surface and the back arc surface of the blade profile are marked by sharp edges, and the marked positions cannot be milled away when the cladding groove is milled;

[0012] Two, cladding groove shape detection; the processed cladding groove is attached to the cladding groove profile measurement surface of the cladding groove shape sample plate, and the light leakage is checked, and when the light leakage exceeds the position required by the process, the cladding groove shape is unqualified;

[0013] Third, shape inspection of the semi-finished cladding area: Fit one surface of the clad airfoil to the line positioning surface 1 of the cladding area clamping template, aligning the scribe mark with the alignment groove 1, and check for light leakage between the cladding area contour measurement surface 1 and the cladding area; Fit the other surface of the clad airfoil to the line positioning surface 2 of the cladding area thickness template, aligning the scribe mark with the alignment groove 2, and check for light leakage between the cladding area contour measurement surface 2 and the cladding area;

[0014] Fourth, shape detection of the finished cladding area: fit the cladding finished blade with the cladding area contour measurement surface of the cladding repair welding sample to check the light leakage between them.

[0015] The beneficial effects of the present invention are as follows: by using the above-mentioned detection device and detection method, the cladding groove before blade cladding, the semi-finished product cladding area after cladding, and the finished product cladding area after cladding can be inspected. If unqualified, they can be repaired in time, thereby ensuring the cladding quality. It is easy to use and does not need to rely too much on three-coordinate measuring equipment, thereby releasing production capacity and reducing measurement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the cladding groove structure;

[0017] Figure 2 This is a schematic diagram of the structure of the semi-finished product cladding area;

[0018] Figure 3 This is a schematic diagram of the structure of the finished product cladding area;

[0019] Figure 4 This is a schematic diagram of the sample structure of the cladding area demarcation line;

[0020] Figure 5 This is a schematic diagram of the cladding groove shape sample structure;

[0021] Figure 6 This is a schematic diagram of the structure of the clamp repair sample in the cladding area;

[0022] Figure 7 This is a schematic diagram of the sample structure of the cladding area thickness;

[0023] Figure 8 Schematic diagram of the cladding and repair welding sample structure. DETAILED DESCRIPTION

[0024] like Figures 4-8 The device for detecting laser cladding of a steam turbine blade shown in the figure comprises a cladding area marking sample 1, a cladding groove shape sample 2, a cladding area clamp repair sample 3, a cladding area thickness sample 4, and a cladding repair welding sample 5. When in use, it can be placed on a conventional detection frame and designed according to the shape of the gear height required; combined with Figure 4The scribing sample block 1 includes sharp edges 11 for scribing the inner arc surface and the back arc surface of the blade profile to be processed. The scribing sample block 1 further includes a scribing groove 13 in the middle of the scribing sample block. The inner side of the scribing groove is a gas inlet side positioning surface 12. The gas inlet side positioning surface 12 is used to contact the gas inlet edge of the blade 100 to be processed. The scribing groove 13 is provided with sharp edges 11 at both ends. As shown in Figure 4 , after scribing the bottom of the blade, the blade can be directly moved upward to scribe the top of the blade, which is convenient to use. Figure 5 The shape sample block 2 of the cladding groove includes a cladding groove contour measuring surface 21 corresponding to the cladding groove contour of the standard part. Figure 6 The cladding area repair sample block 3 includes a profile positioning surface one 33, a line groove one 31, and a cladding area contour measuring surface one 32 corresponding to the shape of the semi-finished cladding area standard part. The profile positioning surface one 33 is used to fit the inner arc surface of the blade profile. Figure 7 The cladding area thickness sample block 4 includes a profile positioning surface two 43, a line groove two 41, and a cladding area contour measuring surface two 42 corresponding to the shape of the semi-finished cladding area standard part. The profile positioning surface two 43 is used to fit the back arc surface of the blade profile. Figure 8 The cladding repair sample block 5 includes a cladding area contour measuring surface three 51 corresponding to the shape of the finished cladding area standard part.

[0025] In addition, the contour of the cladding area contour measuring surface one 32 contains the cladding area contour of the semi-finished cladding area standard part, and the distances between the corresponding points are equal, that is, the contour of the cladding area contour measuring surface one 32 is formed by uniformly expanding the cladding area contour of the semi-finished cladding area standard part. In this way, the plug gauge and the plug needle can be used for measurement when measuring light leakage, which is convenient for repair. Similarly, the contour of the cladding area contour measuring surface two 42 contains the cladding area contour of the semi-finished cladding area standard part, and the distances between the corresponding points are equal.

[0026] A turbine blade laser cladding detection method using the turbine blade laser cladding detection device includes the following steps: scribing; contacting the gas inlet edge of the blade to be processed with the gas inlet side positioning surface 12 of the cladding area scribing sample block 1, and marking the inner arc surface and the back arc surface of the blade by the sharp edges 11. The marked position cannot be milled when milling the cladding groove, that is, the scribed position is away from the intersection position of the cladding groove and the inner arc surface and the back arc surface of the blade profile.

[0027] Cladding groove shape detection; after the cladding groove is processed, the cladding groove is attached to the cladding groove contour measuring surface 21 of the cladding groove shape sample block 2 to check the light leakage. When the light leakage exceeds the position required by the process, the cladding groove shape is unqualified and needs to be repaired.

[0028] Third, the shape of the semi-finished cladding area is detected; one surface of the cladded blade profile is attached to the profile positioning surface one 33 of the cladding area clamp repair template 3, and the scribe mark is corresponded to the alignment groove one 31, the light leakage between the profile measurement surface one 33 of the cladding area and the cladding area is checked, and the semi-finished cladding area is repaired for removing the surface fish scales and the oxide layer if it is unqualified; the other surface of the cladded blade profile is attached to the profile positioning surface two 43 of the cladding area thickness template 4, and the scribe mark is corresponded to the alignment groove two 41, the light leakage between the profile measurement surface two 42 of the cladding area and the cladding area is checked, and the semi-finished cladding area is repaired for removing the surface fish scales and the oxide layer if it is unqualified.

[0029] Fourth, the shape of the finished cladding area is detected; the finished cladded blade is attached to the cladding area profile measurement surface three 51 of the cladding repair welding template 5, and the light leakage between them is checked, and the finished cladding area is repaired if it is unqualified.

[0030] Through the above-mentioned detection in the laser cladding process, the qualified rate of the cladding groove processing and repair, the cladding area polishing and repair can be effectively controlled at a high level by combining with the process requirements and verified by batch production.

[0031] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A turbine blade laser cladding inspection apparatus, characterized by: It includes cladding groove shape sample plate, cladding area repair sample plate and cladding area thickness sample plate; the cladding groove shape sample plate includes cladding groove profile measuring surface, which corresponds to the cladding groove profile of the standard part; the cladding area repair sample plate includes profile positioning surface one, alignment groove one and cladding area profile measuring surface one, which corresponds to the shape of the semi-finished product cladding area standard part; the cladding area thickness sample plate includes profile positioning surface two, alignment groove two and cladding area profile measuring surface two, which corresponds to the shape of the semi-finished product cladding area standard part; It also includes cladding area lineation sample block, which includes sharp edges for lineation of the inner arc surface and the back arc surface of the blade profile to be processed; The cladding area lineation sample block includes lineation groove in the middle of the cladding area lineation sample block, the inner side of the lineation groove is the inlet side positioning surface, which is used to contact the inlet edge of the blade to be processed, and the two ends of the lineation groove are provided with the sharp edges; The inner arc surface and the back arc surface of the blade are marked by lineation through the sharp edges, and the marked position cannot be milled away when the cladding groove is milled, that is, the marked position is far away from the intersection position of the cladding groove and the inner arc surface and the back arc surface of the blade profile; After lineation of the bottom of the blade, the blade is directly moved upward to lineate the top of the blade; It also includes cladding repair sample plate, which includes cladding area profile measuring surface three, which corresponds to the shape of the finished product cladding area standard part; The profile of the cladding area profile measuring surface one contains the cladding area profile of the semi-finished product cladding area standard part, and the distances between the corresponding points are equal; the profile of the cladding area profile measuring surface one is formed by uniform expansion of the cladding area profile of the semi-finished product cladding area standard part; the profile of the cladding area profile measuring surface two contains the cladding area profile of the semi-finished product cladding area standard part, and the distances between the corresponding points are equal; the profile of the cladding area profile measuring surface two is formed by uniform expansion of the cladding area profile of the semi-finished product cladding area standard part.

2. A method of laser cladding inspection of a steam turbine blade, characterized by, The turbine blade laser cladding detection device of claim 1 is used for detection, which includes the following steps: One, lineation; the inlet edge of the blade to be processed is contacted with the inlet side positioning surface of the cladding area lineation sample block, the inner arc surface and the back arc surface of the blade profile are marked by lineation through the sharp edges, and the marked position cannot be milled away when the cladding groove is milled; after lineation of the bottom of the blade, the blade is directly moved upward to lineate the top of the blade; Two, cladding groove shape detection; the processed cladding groove is attached to the cladding groove profile measuring surface of the cladding groove shape sample plate, and the light leakage is checked; when the light leakage exceeds the position required by the process, the cladding groove shape is unqualified; Three, semi-finished product cladding area shape detection; one surface of the cladded blade profile is attached to the profile positioning surface one of the cladding area repair sample plate, and the lineation mark corresponds to the alignment groove one, and the light leakage between the cladding area profile measuring surface one and the cladding area is checked; the other surface of the cladded blade profile is attached to the profile positioning surface two of the cladding area thickness sample plate, and the lineation mark corresponds to the alignment groove two, and the light leakage between the cladding area profile measuring surface two and the cladding area is checked; Fourth, the shape of the finished cladding zone detection; after the cladding of finished blade and cladding zone profile measurement of the sample plate three paste, check the light between them.

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