A support tool and a method of measuring a blade

Abstract

The application relates to the field of gas turbine measurement technology, in particular to a supporting tool and a blade measurement method. The supporting tool comprises a first fixing structure and a second fixing structure connected with a first section and a second section respectively; a connecting piece connects the first fixing structure and the second fixing structure; the blade measurement method comprises the following steps: cutting a blade along a section to be measured; taking at least one pair of position points arranged oppositely on the first section and the second section at a cut section; connecting the first fixing structure with the first section and the second fixing structure with the second section at each pair of position points, and connecting the first fixing structure and the second fixing structure through the connecting piece; cutting a non-through section; and measuring the section to be measured. The first fixing structure and the second fixing structure of the supporting tool are respectively positioned and fixed on the first section and the second section; the relative positions of the hole contour and other features in the blade are ensured, deviation in measurement is prevented, and the precision of internal measurement of the blade is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine measurement technology, in particular to a supporting tool and a blade measurement method. BACKGROUND

[0002] As a key component of a gas turbine, the turbine blade, whether it is a deviation evaluation in the turbine blade manufacturing process or a blade model reconstruction using reverse engineering method, the accurate and reliable measurement of the turbine blade is the first problem to be solved, especially for the accurate measurement of the turbine blade inner cavity. The measurement of the turbine blade outer contour does not involve the cutting process, and the relative positions of the features at each part during the measurement process will not change. The measurement of the turbine blade inner cavity size not only needs to measure the shape of each channel, but also needs to cut the relative positions of each channel profile and other features.

[0003] However, in the process of cutting and measuring the relative positions of each channel profile and other features, it is difficult to ensure the relative positions of each channel profile and other features, resulting in deviation in the measurement process and seriously affecting the measurement accuracy. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects in the prior art that it is difficult to ensure the relative positions of each channel profile and other features in the process of cutting and measuring the relative positions of each channel profile and other features of the turbine blade, resulting in deviation in the measurement process and seriously affecting the measurement accuracy. Based on the above situation, it is necessary to develop a supporting tool to ensure the relative positions of each channel profile and other features.

[0005] To achieve the above purpose, the present application provides a supporting tool, comprising:

[0006] A first fixing structure, one end of which is adapted to be connected to a first section surface of a blade section;

[0007] A second fixing structure, one end of which is adapted to be connected to a second section surface of a blade section;

[0008] A connecting piece movably sleeved on the first fixing structure or the second fixing structure, adapted to connect the other end of the first fixing structure and the other end of the second fixing structure.

[0009] Optionally, it further comprises:

[0010] A supporting piece arranged on the first fixing structure, and the supporting piece is in contact with the first section surface;

[0011] The connecting piece is in contact with the second section surface.

[0012] Optionally, the first fixing structure is threadedly connected to the first sectioning surface; the second fixing structure is threadedly connected to the second sectioning surface; the connecting member threadedly connects the first fixing structure and the second fixing structure; and the supporting member is threadedly connected to the first fixing structure.

[0013] Optionally, the first fixing structure and the second fixing structure are screw rods.

[0014] Optionally, the blade is a turbine blade.

[0015] The application further provides a blade measuring method, which utilizes the supporting tool to support a sectioned segment of a blade, and comprises the following steps:

[0016] partially sectioning the blade along a to-be-measured cross section to form a sectioned segment and a non-penetrated segment;

[0017] selecting at least one pair of position points in the sectioned segment, each pair of position points being located on a first sectioning surface and a second sectioning surface, and each pair of position points being oppositely arranged;

[0018] connecting the first fixing structure to the first sectioning surface and the second fixing structure to the second sectioning surface at each pair of position points, and connecting the first fixing structure and the second fixing structure by moving the connecting member;

[0019] sectioning the non-penetrated segment;

[0020] measuring the to-be-measured cross section.

[0021] The application further provides a blade measuring method, which utilizes the supporting tool to support a sectioned segment of a blade, and comprises the following steps:

[0022] partially sectioning the blade along a to-be-measured cross section to form a sectioned segment and a non-penetrated segment;

[0023] selecting at least one pair of position points in the sectioned segment, each pair of position points being located on a first sectioning surface and a second sectioning surface, and each pair of position points being oppositely arranged;

[0024] connecting the first fixing structure to the first sectioning surface and the second fixing structure to the second sectioning surface at each pair of position points, and connecting the first fixing structure and the second fixing structure by moving the connecting member;

[0025] adhering the supporting member to the first sectioning surface and adhering the connecting member to the second sectioning surface;

[0026] sectioning the non-penetrated segment;

[0027] measuring the to-be-measured cross section.

[0028] The application further provides a blade measuring method, which utilizes the supporting tool to support a sectioned segment of a blade, and comprises the following steps:

[0029] Partially cutting the blade along the section to be measured to form a cutaway section and a non-through section;

[0030] Selecting at least one pair of position points in the cutaway section, each pair of position points being located on the first cut surface and the second cut surface respectively, and each pair of position points being oppositely arranged, and machining a threaded hole on the position points;

[0031] On each pair of position points, the first fixing structure is threadedly connected with the first cut surface, the second fixing structure is threadedly connected with the second cut surface, and the first fixing structure and the second fixing structure are threadedly connected through the movement of the connecting piece;

[0032] The support piece is attached to the first cut surface, and the connecting piece is attached to the second cut surface;

[0033] The non-through section is cut away;

[0034] The section to be measured is measured.

[0035] Optionally, the blade is cut by wire cutting, and the wire cutting direction is perpendicular to the height direction of the blade.

[0036] Optionally, three pairs of position points are arranged, and the three pairs of position points are located near the leading edge, the trailing edge and the middle part of the blade respectively.

[0037] The above technical solution of the present application has the following advantages compared with the prior art:

[0038] 1. The support tool provided by the present application comprises: a first fixing structure, one end of which is adapted to be connected to a first cut surface of a cutaway section of a blade; a second fixing structure, one end of which is adapted to be connected to a second cut surface of the cutaway section of the blade; and a connecting piece, which is movably sleeved on the first fixing structure or the second fixing structure, and is adapted to connect the other end of the first fixing structure and the other end of the second fixing structure; the present application adopts the above technical solution, and the first fixing structure and the second fixing structure are used to position and support and fix the first cut surface and the second cut surface respectively; the relative positions of the internal channel profile and other features of the blade are ensured, deviation in the measurement process is prevented, and the accuracy of the internal measurement of the blade is ensured.

[0039] 2. The support tool provided by the present application further comprises: a support piece, which is arranged on the first fixing structure and attached to the first cut surface; and the connecting piece is attached to the second cut surface; the present application adopts the above technical solution, and the support piece is attached to the first cut surface, and the connecting piece is attached to the second cut surface, thereby improving the stability and reliability of the support tool when supporting the first cut surface and the second cut surface.

[0040] 3. The first fixed structure is threadedly connected to the first section; the second fixed structure is threadedly connected to the second section; the connecting piece connects the first fixed structure and the second fixed structure; and the support piece is threadedly connected to the first fixed structure; the technical scheme is adopted, the first fixed structure and the first section are connected through the threaded structure, the second fixed structure and the second section are connected, and the support piece and the first fixed structure are connected, so that the assembly and disassembly of the support tool on the blade are facilitated.

[0041] 4. The blade is a turbine blade; the technical scheme is adopted, the blade is limited to be a turbine blade, the internal cavity of the turbine blade is accurately measured, the deviation evaluation of the turbine blade in the manufacturing process is ensured, and the turbine blade model is accurately reconstructed by using the reverse engineering method.

[0042] 5. The blade measuring method provided by the application utilizes the support tool to support the section of the blade, comprising the following steps: partially cutting the blade along the section to be measured to form a section and a non-penetrating section; selecting at least one pair of position points in the section, each pair of position points being located on the first section and the second section, and each pair of position points being oppositely arranged; connecting the first fixed structure and the first section and connecting the second fixed structure and the second section at each pair of position points, and connecting the first fixed structure and the second fixed structure by moving the connecting piece; cutting the non-penetrating section; and measuring the section to be measured; the technical scheme is adopted, the first fixed structure and the second fixed structure of the support tool are used to position and support and fix the first section and the second section of the partially cut blade, the relative positions of the internal hole profiles and other features of the blade are ensured, deviation in the measuring process is prevented, and the accuracy of the internal measurement of the blade is ensured.

[0043] 6. The blade measuring method provided by the application utilizes the support tool to support the section of the blade, comprising the following steps: partially cutting the blade along the section to be measured to form a section and a non-penetrating section; selecting at least one pair of position points in the section, each pair of position points being located on the first section and the second section, and each pair of position points being oppositely arranged; connecting the first fixed structure and the first section and connecting the second fixed structure and the second section at each pair of position points, and connecting the first fixed structure and the second fixed structure by moving the connecting piece; connecting the support piece with the first section and connecting the connecting piece with the second section; cutting the non-penetrating section; and measuring the section to be measured; the technical scheme is adopted, the first section and the second section are supported by the support tool, the stability and reliability of the support tool in supporting the first section and the second section are improved, and the measurement accuracy of the internal blade is ensured.

[0044] 7. The blade measuring method provided by the present application supports the sectioned segment of the blade by using the support tool, and comprises the following steps: partially sectioning the blade along the cross section to be measured to form a sectioned segment and a non-penetrated segment; selecting at least one pair of position points in the sectioned segment, each pair of position points being located on a first sectioning surface and a second sectioning surface respectively, and each pair of position points being oppositely arranged, and processing a threaded hole on the position points; threadedly connecting a first fixing structure with the first sectioning surface and threadedly connecting a second fixing structure with the second sectioning surface on each pair of position points, and threadedly connecting the first fixing structure and the second fixing structure through a moving connector; abutting the support member with the first sectioning surface and abutting the connector with the second sectioning surface; sectioning the non-penetrated segment; and measuring the cross section to be measured; the present application adopts the above technical solution, and by arranging threaded structures between the components of the support tool, the first fixing structure is connected with the first sectioning surface, the second fixing structure is connected with the second sectioning surface, and the support member is connected with the first fixing structure, so that the assembly and disassembly of the support tool on the blade are facilitated, and the efficiency of measuring the interior of the blade is improved.

[0045] 8. The present application adopts the wire cutting to section the blade, and the wire cutting direction is perpendicular to the direction of the height of the blade; the present application adopts the above technical solution, and by limiting the cutting mode and direction, the surface quality of the first sectioning surface and the second sectioning surface is ensured, the size and position relationship of the features in the interior of the blade are ensured to be correctly displayed, and the accuracy of measuring the features in the interior of the blade is ensured.

[0046] 9. The present application arranges three pairs of position points, and the three pairs of position points are located at positions close to the leading edge, the trailing edge and the middle portion of the blade respectively; the present application adopts the above technical solution, and by arranging three points far away from each other to support the first sectioning surface and the second sectioning surface, the stable and reliable degree of the support tool to fixedly support the first sectioning surface and the second sectioning surface is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed to be used in the following specific embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0048] Figure 1 The local perspective structure diagram of the support tool provided in the embodiments of the present application when measuring the cross section of the turbine blade Figure 1

[0049] Figure 2 The local perspective structure diagram of the sectioned cross section of the turbine blade provided in the embodiments of the present application

[0050] Figure 3 ​Fig. 1 is a schematic view of a support tool according to an embodiment of the present application;

[0051] Figure 4 Fig. 2 is a schematic view of a partial cross-section of the support tool according to an embodiment of the present application;

[0052] Figure 5 Fig. 3 is a schematic view of a partial perspective of the support tool according to an embodiment of the present application Figure 2 .

[0053] Legend of reference signs:

[0054] 1 turbine blade; 2 blade body; 3 support member; 4 connecting member; 5 non-through section; 6 lower surface of sectioned section; 7 first hole; 8 second hole; 9 third hole; 10 fourth hole; 11 fifth hole; 12 sixth hole; 13 first fixing structure; 14 second fixing structure; 15 upper surface of sectioned section. DETAILED DESCRIPTION

[0055] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0056] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0057] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0058] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] like Figures 1 to 5 One specific embodiment of the support tool shown is suitable for installation in the sectional section of a blade to support the sectional section of the blade. It includes: a first fixing structure 13 with one end connected to a first cutting surface of the sectional section of the blade, a second fixing structure 14 with one end connected to a second cutting surface of the sectional section of the blade, a connector 4 movably sleeved on the first fixing structure 13, and a support member 3 disposed on the first fixing structure 13, etc. The first cutting surface and the second cutting surface are arranged opposite to each other. Specifically, the first cutting surface is the lower surface 6 of the sectional section, and the second cutting surface is the upper surface 15 of the sectional section.

[0060] like Figure 1 , Figure 3 and Figure 4 As shown, the connector 4 connects to the other end of the first fixing structure 13 and the other end of the second fixing structure 14; the support 3 is fitted to the lower surface 6 of the cut section; and the connector 4 is fitted to the upper surface 15 of the cut section. Specifically, both the first fixing structure 13 and the second fixing structure 14 are screws, with the first fixing structure 13 being a long screw and the second fixing structure 14 being a short screw. A smooth rod portion can be provided in the middle section of the first fixing structure 13. The connector 4 is an upper support plate, and the support 3 is a lower support plate.

[0061] The first fixing structure 13 is threaded onto the lower surface 6 of the sectional section; the second fixing structure 14 is threaded onto the upper surface 15 of the sectional section; the connecting member 4 is threadedly connected to the first fixing structure 13 and the second fixing structure 14; the support member 3 is threadedly connected to the first fixing structure 13. The total length of the first fixing structure 13 and the second fixing structure 14 is slightly greater than the height of the sectional section, and the total length of the first fixing structure 13 and the second fixing structure 14 is less than the distance between the bottom wall of the threaded hole on the first cut surface and the second cut surface. The blade is a turbine blade 1, especially a turbine blade 1 on a gas turbine. The blade body 2 of the turbine blade 1 on a gas turbine has a complex internal cooling structure such as a serpentine channel, requiring precise measurement of the internal structure of the blade.

[0062] like Figure 1 , Figure 3 and Figure 5As shown, the present invention also provides a blade measurement method, which uses the aforementioned support tool to support the cut section of the blade, including: partially cutting the blade body 2 along the section to be measured to form a cut section and an unconnected section 5. Specifically, the blade is cut from the inlet side and the outlet side at a certain distance above the section to be measured, but not completely connected. The lower surface 6 of the cut section is the section to be measured; three pairs of position points are selected in the cut section, each pair of position points is located on the first cutting surface and the second cutting surface, and each pair of position points is set opposite to each other. The three pairs of position points are located near the leading edge, trailing edge and middle of the blade, and the position points are arranged in places with thicker blade walls as much as possible; at each pair of position points, the first fixing structure 13 is connected to the first cutting surface and the second fixing structure 14 is connected to the second cutting surface, and the first fixing structure 13 and the second fixing structure 14 are connected by a movable connector 4; the unconnected section 5 is cut open; a coordinate measuring machine is used to measure the section to be measured to perform accurate shape and position measurement of the internal and external contours of the blade. The remaining sections to be measured are measured using the same method. Specifically, the blade is cut using wire EDM, with the wire feed direction perpendicular to the blade height, so that both the first and second cutting surfaces are perpendicular to the blade height direction. Figure 1 The leftmost arrow indicates the direction of the air intake.

[0063] like Figure 1 , Figure 3 and Figure 5 As shown, the present invention also provides a blade measurement method, which uses the aforementioned support tool to support the cut section of the blade, including: partially cutting the blade body 2 along the section to be measured to form a cut section and an incomplete section 5; specifically, cutting the blade from the inlet side and the outlet side respectively at a certain distance above the section to be measured, but not completely through it, the lower surface 6 of the cut section is the section to be measured; selecting three pairs of position points in the cut section, each pair of position points is located on the first cutting plane and the second cutting plane respectively, and each pair of position points is set opposite to each other, the three pairs of position points are respectively... Avoid locating the positions near the leading edge, trailing edge, and middle of the blade; instead, select locations with thicker blade walls. At each pair of positions, connect the first fixing structure 13 to the first cutting surface and the second fixing structure 14 to the second cutting surface, connecting the first fixing structure 13 and the second fixing structure 14 via the movable connector 4. Fit the support 3 to the first cutting surface and the connector 4 to the second cutting surface. Cut open the incomplete section 5. Use a coordinate measuring machine to measure the cross-section to be measured, performing precise shape and position measurements of the blade's internal and external contours. Measure the remaining cross-sections using the same method.

[0064] like Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the present application also provides a blade measuring method, which utilizes the support tool to support the sectioned segment of the blade, comprising: partially cutting the blade body 2 along the to-be-measured cross section to form a sectioned segment and a non-penetrating segment 5; specifically, cutting from the air inlet side and the air outlet side respectively at a certain distance above the to-be-measured cross section, but not completely penetrating, the lower surface 6 of the sectioned segment being the to-be-measured cross section; selecting three pairs of position points in the sectioned segment, each pair of position points being located on the first cutting surface and the second cutting surface respectively, and each pair of position points being oppositely arranged, and processing threaded holes on the position points; wherein the first hole 7 is located on the upper surface 15 of the sectioned segment at a position close to the leading edge of the blade, the second hole 8 is located on the upper surface 15 of the sectioned segment at a position close to the middle part of the blade, and the third hole 9 is located on the upper surface 15 of the sectioned segment at a position close to the trailing edge of the blade; the fourth hole 10 is located on the lower surface 6 of the sectioned segment at a position close to the leading edge of the blade, the fifth hole 11 is located on the lower surface 6 of the sectioned segment at a position close to the middle part of the blade, and the sixth hole 12 is located on the lower surface 6 of the sectioned segment at a position close to the trailing edge of the blade; the position points are preferably arranged at positions where the blade wall thickness is relatively thick; on each pair of position points, the first fixing structure 13 is threadedly connected with the first cutting surface, the second fixing structure 14 is threadedly connected with the second cutting surface, and the first fixing structure 13 and the second fixing structure 14 are threadedly connected through the movement of the connecting piece 4; the support piece 3 is attached to the first cutting surface, and the connecting piece 4 is attached to the second cutting surface; the non-penetrating segment 5 is sectioned; a three-coordinate measuring machine is used to measure the to-be-measured cross section, and accurate shape and position measurement is performed on the internal and external contours of the blade. The remaining to-be-measured cross sections are measured by the same method.

[0065] As shown, Figure 4 The installation process of the support tool described in the present application is briefly described as follows: for a pair of position points, the first fixing structure 13 with the upper support piece and the lower support piece is screwed into the fourth hole 10 on the lower surface 6 of the sectioned segment, the lower end of the first fixing structure 13 is screwed into the bottom of the fourth hole 10, so as to leave enough space for the installation of the second fixing structure 14; then the second fixing structure 14 is screwed upward into the first hole 7 on the corresponding upper surface 15 of the sectioned segment; the first fixing structure 13 is rotated upward, the top of the first fixing structure 13 contacts the bottom of the second fixing structure 14, and the lower end of the first fixing structure 13 forms a gap with the bottom of the fourth hole 10; the upper support piece is rotated upward to connect the first fixing structure 13 and the second fixing structure 14; the upper support piece is in close contact with the upper surface 15 of the sectioned segment, and the lower support piece is rotated downward to be in close contact with the lower surface 6 of the sectioned segment.

[0066] As an alternative embodiment, the connecting piece 4 is movably arranged on the first fixed structure 13; alternatively, the connecting piece 4 is movably arranged on the second fixed structure 14.

[0067] As an alternative embodiment, the connecting piece 4 is movably arranged on the first fixed structure 13; alternatively, the connecting piece 4 is movably arranged on the second fixed structure 14.

[0068] As an alternative embodiment, the connecting piece 4 is movably arranged on the first fixed structure 13; alternatively, the connecting piece 4 is movably arranged on the second fixed structure 14.

[0069] Obviously, the above-mentioned embodiments are merely examples for the purpose of clear illustration, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A support tool adapted to be mounted in a sectioned blade segment having first and second oppositely disposed sectioning surfaces, characterised in that, The application relates to a method for measuring the profile of a turbine blade (1) on a gas turbine, and comprises the following steps: a first fixing structure (13) is connected to a first section of the turbine blade (1) at one end; a second fixing structure (14) is connected to a second section of the turbine blade (1) at one end; a connecting piece (4) is movably sleeved on the first fixing structure (13) or the second fixing structure (14) and is adapted to connect the other end of the first fixing structure (13) and the other end of the second fixing structure (14); the method further comprises the following steps: a supporting piece (3) is arranged on the first fixing structure (13) and is attached to the first section; the connecting piece (4) is attached to the second section; the first fixing structure (13) is screwed to the first section; the second fixing structure (14) is screwed to the second section; the connecting piece (4) is screwed to the first fixing structure (13) and the second fixing structure (14); and the supporting piece (3) is screwed to the first fixing structure (13); the total length of the first fixing structure (13) and the second fixing structure (14) is greater than the height of the turbine blade (1) and is less than the distance between the bottom wall of the screw hole on the first section and the bottom wall of the screw hole on the second section; the turbine blade (1) is arranged on a gas turbine; the blade body (2) of the turbine blade (1) on the gas turbine has a serpentine channel internal cooling structure; three pairs of position points are selected in the section, each pair of position points is arranged on the first section and the second section and is oppositely arranged, and each pair of position points is arranged near the leading edge, the trailing edge and the middle part of the turbine blade (1); the first fixing structure (13) is connected to the first section, the second fixing structure (14) is connected to the second section, and the first fixing structure (13) and the second fixing structure (14) are connected by moving the connecting piece (4) at each pair of position points; a section (5) is cut but not completely cut; a three-coordinate measuring machine is used to measure the to-be-measured section and the internal and external profiles of the turbine blade (1) are measured; the first fixing structure (13) and the second fixing structure (14) are both screw rods.

2. A blade measurement method for supporting a cutaway section of a blade using the support tool according to claim 1, characterized by, The method comprises the following steps: a turbine blade (1) is partially cut along a to-be-measured section to form a section and a section (5) that is not completely cut; at least one pair of position points is selected in the section, each pair of position points is arranged on the first section and the second section and is oppositely arranged, and a screw hole is formed at the position points; the first fixing structure (13) is screwed to the first section, the second fixing structure (14) is screwed to the second section, and the first fixing structure (13) and the second fixing structure (14) are screwed by moving the connecting piece (4) at each pair of position points; the supporting piece (3) is attached to the first section, and the connecting piece (4) is attached to the second section; the section (5) is cut but not completely cut; the to-be-measured section is measured.

3. The blade measurement method according to claim 2, characterized in that, The turbine blade (1) is cut by wire cutting, and the wire cutting direction is perpendicular to the height direction of the turbine blade (1).

4. The blade measurement method according to claim 2, characterized by, The three pairs of position points are arranged near the leading edge, the trailing edge and the middle part of the turbine blade (1).

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