Machining method and fixture for the conical surface of the blade root gauge of an aircraft engine blade

Abstract

The invention relates to the technical field of mechanical processing, and discloses a method for processing a conical surface of a blade root gauge of an aero-engine blade. The method comprises the following steps: determining a rotation center of the conical surface, designing a fixture for clamping the blade root gauge and keeping a generatrix of the conical surface horizontal after clamping, grinding the conical surface by a grinding wheel, rotating the fixture, driving the blade root gauge to rotate and complete the grinding of the conical surface, and the rotation center of the conical surface coincides with the rotation center of the fixture; a marker is provided on the end face of the inclined lower end of the conical surface of the blade root gauge, the projection of the center of the marker on the end face is located on a radius line of the arc of the inclined lower end of the conical surface perpendicular to the bottom face, and the height of the projection of the center of the marker on the end face is half of the distance value from the bottom of a double-angle inclined dovetail groove to the bottom face of the blade root gauge; establishing a blade root gauge model and designing a marker, and obtaining a vertical distance between the center of the marker and the generatrix of the conical surface in the model; and detecting the vertical distance during grinding until it is infinitely close to or equal to the vertical distance in the model.

Description

Technical Field

[0001] The invention relates to the technical field of parts machining, and in particular to a method and a machining fixture for machining a cone profile surface of a blade root gauge of an aero-engine blade. Background Art

[0002] The profile of aircraft engine blades needs to be processed and tested with the help of a blade root profile gauge, such as Figures 1 to 4 As shown, it is used to detect the root profile of aircraft engine blades. It consists of a specific conical profile and a double-angle inclined dovetail mounting groove. The vertical distance between the intersection of the conical profile and the symmetric center plane of the dovetail groove and the side of the gauge step and the bottom surface of the dovetail groove (i.e. Figure 1 The L1 dimension in the figure controls the dimensional accuracy of the blade root gauge.

[0003] When using this blade root gauge for blade inspection, the blade root part is positioned and installed in the double-angle bevel dovetail groove, and the fit is good. The blade blade edge gauge is used to check the light transmission and gap between the blade shape and the conical surface to determine whether the blade root part is qualified. This blade root gauge can quickly detect blade quality and greatly improve detection efficiency.

[0004] For example, the patent with announcement number CN202648640U discloses a turbine blade root detection module, the middle part of the detection module body is provided with a blade root type line groove matching the blade root, the detection module body surface above the blade root type line groove is provided with a measuring surface, the measuring surface can match and detect the blade root conical surface of the blade root, the detection module body below the blade root type line groove is a base, the detection module simulates the assembly state of the blade root through the blade root type line groove, and detects whether the processing size of the blade root meets the process requirements by comparing the measuring surface with the blade root. The turbine blade root detection module is compact and precise in design, easy to operate and clamp, and has a simple and clear detection method, which also significantly improves the accuracy and efficiency of blade root detection.

[0005] However, there is currently no better way to quickly process the conical surface of this type of blade root gauge. When using common processing equipment to process this type of conical surface, multi-functional flat-nose pliers are generally used for clamping, which cannot achieve rotational processing along the axis direction of the engine. The process is complicated and the processing accuracy is often not achieved. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method for machining the conical surface of an aircraft engine blade root gauge, which can ensure the machining accuracy of the conical surface and the relative dimensional accuracy between the conical surface and the double-angle bevel dovetail groove.

[0007] The invention also provides a processing fixture for realizing the processing method.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A method for machining a conical surface of a blade root gauge of an aero-engine blade, wherein the blade root gauge comprises a conical surface for detecting a blade shape, a bottom surface arranged opposite to the conical surface, and a double-angle inclined dovetail groove arranged between the conical surface and the bottom surface for inserting and positioning a blade root portion, wherein the central axis of the bottom of the double-angle inclined dovetail groove forms an angle with the engine axis; determining the rotation center of the conical surface, designing a fixture for clamping the blade root gauge and keeping the generatrix of the conical surface in a horizontal state after clamping, grinding the conical surface with a grinding wheel, and rotating the fixture to drive the blade root gauge to rotate to complete the grinding of the conical surface, wherein the rotation center of the conical surface coincides with the rotation center of the fixture;

[0010] The blade root gauge is provided with a marker on the end surface of the inclined lower end of the conical surface, and the position of the marker on the end surface follows: the projection of the center of the marker on the end surface is located on the radius line of the arc of the inclined lower end of the conical surface perpendicular to the bottom surface, and the height of the projection of the center of the marker on the end surface is half of the distance from the bottom of the double-angle inclined dovetail groove to the bottom surface of the blade root gauge;

[0011] The actual blade root gauge with the marker set is subjected to dimensional inspection to measure the vertical spacing between the center of the marker and the inclined surface close to the marker on the double-angle bevel dovetail groove, the vertical spacing between the center of the marker and the bottom of the double-angle bevel dovetail groove, and the vertical spacing from the center of the marker to the end face; a blade root gauge model is established through mapping software, the marker is designed on the model, and the position of the marker is made to meet the vertical spacings, so as to obtain the vertical distance between the center of the marker and the generatrix of the conical surface in the model; when grinding the conical surface, the machining vertical distance between the center of the marker and the generatrix of the conical surface is detected until the machining vertical distance is infinitely close to or equal to the vertical distance in the blade root gauge model.

[0012] Furthermore, the height at which the center of the marker is located on the end surface is half of the distance value rounded up.

[0013] Furthermore, the marker is a technological sphere, and the diameter of the technological sphere is Φ6 to Φ8.

[0014] Furthermore, the process sphere is installed on a cylindrical rod, and a blind hole for installing the cylindrical rod is opened on the end surface of the blade root gauge.

[0015] Furthermore, the conical surface of the blade root gauge needs to ensure a grinding amount of at least 0.5 to 0.6 mm.

[0016] A processing fixture for implementing the processing method as described above, comprising a pressure plate and a base for clamping the end face of the blade root gauge and the surface opposite to the end face, the pressure plate contacts the end face, the base contacts the surface, a fastening rod that can promote stable clamping is connected in series between the base and the pressure plate, and the base is also provided with a bottom surface locating pin that contacts the bottom surface of the blade root gauge and plays a limiting role, and a side surface locating pin that contacts the side surfaces on both sides of the bottom surface of the blade root gauge and plays a limiting role; the base is also provided with a support that contacts the pressure plate, and the support is used to ensure that the pressure plate remains flat when clamping the blade root gauge; a core rod with top holes at both ends is also installed on the base, the core rod is arranged perpendicular to the base, the core rod, the support, the fastening rod, the bottom surface locating pin, and the side surface locating pins are all arranged in parallel, the fixture is installed on the grinding wheel equipment through the top hole on the core rod, the core rod is installed on the grinding wheel equipment at an angle, and the inclination angle is equal to the cone angle of the conical surface; the rotation center of the conical surface is located on the axis of the core rod.

[0017] Furthermore, the pressure plates are in two pieces and are evenly arranged on the end surface of the blade root gauge.

[0018] Furthermore, the fastening rod is a stud bolt, and a threaded hole is provided on the base to install the fastening rod. The fastening rod passes through the pressure plate and is locked by a shoulder nut.

[0019] Furthermore, a set screw is installed at the threaded hole on the base.

[0020] Furthermore, the support is an adjustable support, the end of the adjustable support close to the base is a threaded end, a screw hole is provided on the base for installing the adjustable support, and a nut is sleeved on the threaded end of the adjustable support.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The processing method transforms the virtual axis of rotation of the conical surface of the blade root gauge from a virtual line in space to an actual rotation line. By designing a fixture to clamp the blade root gauge, the generatrix of the conical surface is kept horizontal and in contact with the grinding wheel. The blade root gauge is driven to rotate as the fixture rotates, and the grinding of the conical surface by the grinding wheel is successfully completed.

[0023] By designing the process ball, the mutual dimensional relationship between the conical surface and the double-angle bevel dovetail groove is converted into the vertical distance between the process ball and the generatrix of the conical surface. During the grinding process, it is only necessary to ensure that the vertical distance is processed to the size to ensure the structural dimensional accuracy of the blade root gauge, thereby ensuring the accurate detection of the blade root part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a blade root gauge in the background technology;

[0025] Figure 2 for Figure 1Top view of the mid-leaf root gauge;

[0026] Figure 3 for Figure 1 Middle BB section;

[0027] Figure 4 for Figure 1 Right side view of the middle leaf root gauge;

[0028] Figure 5 for Figure 1 Illustration of the vertical distance from the center of the marker on the middle blade root gauge to the related structure on the double-angle bevel dovetail groove;

[0029] Figure 6 for Figure 1 Illustration of the vertical distance from the center of the mark on the middle leaf root gauge to the end face;

[0030] Figure 7 It is a front view of the processing fixture described in Example 2;

[0031] Figure 8 for Figure 7 Top view of the machining fixture;

[0032] Fig. 9 This is a schematic diagram of the structure of the machining fixture in Example 2 for clamping the blade root gauge for grinding. DETAILED DESCRIPTION

[0033] In order to clearly illustrate the technical features of the present solution, the present technical solution is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0035] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0038] Example 1

[0039] A method for machining a conical surface of a blade root gauge of an aero-engine blade, wherein the blade root gauge 1 has a structure as shown in Figure 1 to Figure 4As shown, it includes a conical surface 11 for detecting the blade shape, a bottom surface 12 arranged opposite to the conical surface, and a double-angle inclined dovetail groove 13 arranged between the conical surface and the bottom surface for inserting and positioning the blade root part. The central axis of the bottom of the double-angle inclined dovetail groove forms an angle with the engine axis, and the double-angle inclined dovetail groove 13 is conventionally processed; the processing method is to process the conical surface after the double-angle inclined dovetail groove is processed, specifically, according to the arc direction of the conical surface 11, determine the rotation center of the conical surface, design a fixture 4 that can clamp the blade root gauge and keep the generatrix of the conical surface in a horizontal state after clamping, at this time, the conical surface can be convenient for the grinding wheel 2 to perform grinding, wherein the rotation center of the conical surface 11 and the rotation center of the fixture 4 need to coincide; by rotating the fixture 4, the blade root gauge 1 is driven to rotate to complete the grinding of the conical surface 11.

[0040] In order to ensure the processing accuracy of the conical surface and the relative dimensional accuracy of the conical surface and the double-angle bevel dovetail groove, a marker 3 is set on the end face 14 of the inclined lower end of the conical surface on the blade root gauge. The position of the marker is particular, that is, the projection of the center of the marker 3 on the end face 14 is located on the radius line of the arc of the inclined lower end of the conical surface perpendicular to the bottom surface. The height of the projection of the center of the marker 3 on the end face 14 is half of the distance value from the bottom of the double-angle bevel dovetail groove to the bottom surface 12 of the blade root gauge. When half of the distance value is a non-integer, it is better to round it up according to the rounding principle.

[0041] Perform dimensional inspection on the blade root gauge with markers set, such as Figure 5 As shown in the figure, the vertical distance between the center of the marker and the inclined surface close to the marker on the double-angle inclined dovetail groove is measured (see Figure 5 2.972 in the dimension), the vertical distance between the center of the marker and the bottom of the double-angle bevel dovetail groove (see Figure 5 0.865 dimension in ) and the vertical distance from the center of the marker to the end face (see Figure 6 10 dimensions in it); establish a blade root measurement model through drawing software, design markers on the model according to the above position description, and make the marker positions meet the vertical spacing dimensions measured on the actual object, then perform view conversion on the model diagram, and obtain the lateral vertical distance and vertical vertical distance between the rotation center of the conical surface and the projection of the marker center on the end face 14, and at the same time obtain the vertical distance between the center of marker 3 and the generatrix of the conical surface 11; when the blade root gauge is clamped in the fixture for grinding, it is necessary to ensure that the positional relationship between the rotation center of the fixture and the center of the marker meets the above lateral vertical distance and vertical vertical distance; when grinding the conical surface 11, the machining vertical distance between the center of marker 3 and the generatrix of the conical surface 11 is measured until the machining vertical distance is infinitely close to or equal to the vertical distance in the blade root measurement model, that is, the conical surface size is processed in place.

[0042] The processing method mainly converts the virtual axis of rotation of the conical surface 11 of the blade root gauge from a virtual line in space into an actual rotation line, and designs a fixture 4 to clamp the blade root gauge so that the generatrix of the conical surface 11 remains horizontal and in contact with the grinding wheel 2. As the fixture 4 rotates, the blade root gauge 1 is driven to rotate, and the grinding of the conical surface by the grinding wheel is successfully completed, solving the problem of difficult positioning of the conical surface processing; by designing a marker as an intermediate carrier, the mutual size relationship between the conical surface and the double-angle bevel dovetail groove is converted into the vertical distance between the marker and the generatrix of the conical surface. When the basic dimensions of the blade root gauge are qualified, as long as the vertical distance is qualified, the structural accuracy of the blade root gauge can be guaranteed. Therefore, during the grinding wheel grinding process, it is only necessary to ensure that the vertical distance is processed to the size, which greatly simplifies the processing technology while ensuring the accuracy.

[0043] In order to facilitate the dimensional measurement during the grinding process, the marker 3 can be designed as a process sphere. The diameter of the process sphere is generally Ф6~Ф8mm. The process sphere is installed on a Ф5mm cylindrical rod. A blind hole for the installation of the cylindrical rod is opened on the end face of the blade root gauge. The cylindrical rod is inserted into the blind hole. The depth of the blind hole is generally 10~15mm.

[0044] The conical surface 11 of the blade root gauge must have a grinding allowance of at least 0.5 to 0.6 mm. The grinding wheel is ground 2 to 3 times. After the first rough grinding, the fitter platform measures the distance from the actual conical surface generatrix to the center of the process sphere (this distance dimension measurement belongs to the conventional measurement method and is not described in detail here). Calculate the margin between the distance and the dimension obtained in the model diagram, and then grind for the second time with a grinding allowance of 0.05 to 0.1 mm, and then measure the aforementioned distance. The third grinding is qualified.

[0045] Example 2

[0046] A processing fixture for implementing the processing method in Example 1 is provided, such as Figure 7 and Figure 8 As shown, it includes a pressure plate 41 and a base 42 for clamping the end face 14 of the blade root gauge installation process sphere and the surface opposite to the end face. The pressure plate 41 contacts the end face 14, and the base 42 contacts the surface. A fastening rod 51 is connected in series between the base 42 and the pressure plate 41 to promote stable clamping. The fastening rod 51 is a stud bolt. A threaded hole is provided on the base 42 to install one end of the fastening rod. The other end of the fastening rod 51 passes through the pressure plate 41 and is locked by a shoulder nut 52. A set screw 53 is also installed at the threaded hole on the base 42, which can further improve the clamping stability and safety during grinding.

[0047] When clamping, the blade root gauge 1 needs to use the bottom surface 12 (the bottom surface is the surface opposite to the conical surface) and the side surfaces on both sides of the bottom surface as positioning references to meet the processing and precision requirements of the conical surface. Therefore, the base 42 is also provided with a bottom surface positioning pin 61 in contact with the bottom surface 12 of the blade root gauge and a side surface positioning pin 62 in contact with the side surface of the blade root gauge. The bottom surface positioning pin 61 and the side surface positioning pin 62 can support and stop the blade root gauge during the grinding process; the base 42 is also provided with a support 71 in contact with the pressure plate 41. The support 71 is used to ensure that the pressure plate 41 remains flat when clamping the blade root gauge. The support 71 is an adjustment support to adapt to the processing of blade root gauges of different sizes; the end of the adjustment support close to the base 42 is a threaded end, and a screw hole is provided on the base 42 for the adjustment support to be installed. A nut 72 is sleeved on the threaded end of the adjustment support. By loosening the nut, the adjustment support can be rotated to adjust the height of the pressure plate. After the adjustment is in place, the nut 72 can be tightened.

[0048] The support 71 and the bottom locating pin 61 are respectively located on both sides of the fastening rod 51 to better balance the force on the pressure plate; generally, two pressure plates 41 are provided and are evenly distributed on the end surface of the blade root gauge.

[0049] like Fig. 9 As shown, a mandrel 8 with top holes at both ends is inserted on the base 42, and the mandrel 8 is arranged perpendicular to the base 42. The mandrel, support, fastening rod, bottom positioning pin, and side positioning pin are all arranged in parallel. The fixture 4 is installed on the grinding wheel device through the top hole on the mandrel 8. The mandrel 8 is installed on the grinding wheel device at an angle, and the angle of inclination is the same as the cone angle of the conical surface (see Figure 4 The β angle in the center is equal; the rotation center of the conical surface 11 is located on the axis of the mandrel 8. There is no specific requirement for the insertion position of the mandrel on the base. When the fixture holding the blade gauge is installed on the grinding wheel equipment, after the mandrel is installed (the top seat for clamping the mandrel is installed on the workbench of the grinding wheel equipment, and the required angle of inclination of the mandrel can be met by rotating the workbench), the conical surface of the blade gauge is aligned with the grinding wheel to determine the position of the base on the mandrel.

[0050] The mandrel 8 provides rotation support for the fixture 4 and fixes the rotation radius of the arc on the conical surface. The top holes at both ends of the mandrel can be processed on ordinary internal grinding, tool grinding, external cylindrical grinding and other machine tools.

[0051] The blade root gauge processed by the above processing method and processing fixture has been verified by comparing the three-coordinate measurement data. Its processing accuracy can reach within the range of ±0.01mm, which fully meets the manufacturing accuracy requirements of the blade root gauge.

[0052] The processing fixture of the present invention has a small volume, is easy to clamp, and is flexible to adjust. It simplifies the processing technology of the blade root gauge and reduces the processing difficulty. The processing method can be extended to the processing of various types of blade root gauges with various tooth shapes, such as the tail single-angle dovetail groove gauge, double-angle dovetail groove gauge, single-angle straight groove, double-angle straight groove conical surface, cylindrical surface gauge, etc.

[0053] Example 3

[0054] The difference between this embodiment and embodiment 2 is that the support structure is different. The support of this embodiment is a telescopic rod fixedly connected to the base, the telescopic end of the telescopic rod is in contact with the pressure plate, a buckle is provided on the outer surface of the telescopic end, and a plurality of holes are provided on the telescopic rod for the buckle to pop out. When the support height needs to be adjusted, the telescopic end is moved to the required position so that the buckle pops out from the hole at the corresponding position and is locked.

[0055] Obviously, the above embodiments are merely examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for machining a conical surface of a blade root gauge of an aircraft engine blade, characterized in that: The blade root gauge comprises a conical surface for detecting the blade shape, a bottom surface arranged opposite to the conical surface, and a double-angle inclined dovetail groove arranged between the conical surface and the bottom surface for inserting and positioning the blade root part, the central axis of the bottom of the double-angle inclined dovetail groove forms an angle with the engine axis, the processing method is to determine the rotation center of the conical surface, design a fixture for clamping the blade root gauge and keeping the generatrix of the conical surface in a horizontal state after clamping, the conical surface is ground by a grinding wheel, and the grinding of the conical surface is completed by rotating the fixture to drive the blade root gauge to rotate, and the rotation center of the conical surface coincides with the rotation center of the fixture; The blade root gauge is provided with a marker on the end face of the inclined lower end of the conical surface, and the position of the marker on the end face complies with: the projection of the center of the marker on the end face is located on the radius line of the arc of the inclined lower end of the conical surface perpendicular to the bottom face, and the height of the projection of the center of the marker on the end face is half of the distance value from the bottom of the double-angle inclined dovetail groove to the bottom face of the blade root gauge; the actual blade root gauge with the marker set is subjected to dimensional inspection, and the vertical spacing between the center of the marker and the inclined surface of the double-angle inclined dovetail groove close to the marker, the vertical spacing between the center of the marker and the bottom of the double-angle inclined dovetail groove, and the vertical spacing from the center of the marker to the end face are measured; A blade root measurement model is established through mapping software, the marker is designed on the model, and the position of the marker is made to meet the vertical spacing, so as to obtain the vertical distance between the center of the marker and the generatrix of the conical surface in the model; when grinding the conical surface, the processing vertical distance between the center of the marker and the generatrix of the conical surface is detected until the processing vertical distance is infinitely close to or equal to the vertical distance in the blade root measurement model.

2. The method for machining the conical surface of the blade root gauge of an aircraft engine blade according to claim 1, characterized in that: The height at which the center of the marker is located on the end surface is half of the distance value rounded up.

3. The method for machining the conical surface of the blade root gauge of an aircraft engine blade according to claim 1 or 2, characterized in that: The marker is a technical sphere, and the diameter of the technical sphere is Φ6-Φ8 mm.

4. The method for machining the conical surface of the blade root gauge of an aircraft engine blade according to claim 3, characterized in that: The process sphere is installed on a cylindrical rod, and a blind hole for installing the cylindrical rod is opened on the end surface of the blade root gauge.

5. The method for machining the conical surface of the blade root gauge of an aircraft engine blade according to claim 1, characterized in that: The conical surface of the blade root gauge must have a grinding amount of at least 0.5 to 0.6 mm.

6. A processing fixture for implementing the processing method according to any one of claims 1 to 5, characterized in that: It includes a pressure plate and a base for clamping the end face of the blade root gauge and the surface opposite to the end face, the pressure plate contacts the end face, the base contacts the surface, a fastening rod that can promote stable clamping is connected in series between the base and the pressure plate, and the base is also provided with a bottom surface locating pin that contacts the bottom surface of the blade root gauge and plays a limiting role, and a side surface locating pin that contacts the side surfaces on both sides of the bottom surface of the blade root gauge and plays a limiting role; the base is also provided with a support that contacts the pressure plate, and the support is used to ensure that the pressure plate remains flat when clamping the blade root gauge; a core rod with top holes at both ends is also installed on the base, the core rod is arranged perpendicular to the base, the core rod, the support, the fastening rod, the bottom surface locating pin, and the side surface locating pins are all arranged in parallel, and the fixture is installed on the grinding wheel equipment through the top hole on the core rod, and the core rod is installed on the grinding wheel equipment at an angle, and the inclination angle is equal to the cone angle of the conical surface; the rotation center of the conical surface is located on the axis of the core rod.

7. The aero-engine blade root gauge conical surface machining fixture according to claim 6, characterized in that: The pressure plates are in two pieces and are evenly arranged on the end surface of the blade root gauge.

8. The aero-engine blade root gauge conical surface machining fixture according to claim 6, characterized in that: The fastening rod is a stud bolt, and a threaded hole is provided on the base to install the fastening rod. The fastening rod passes through the pressure plate and is locked by a shoulder nut.

9. The aero-engine blade root gauge conical surface machining fixture according to claim 8, characterized in that: A set screw is also installed at the threaded hole on the base.

10. The aero-engine blade root gauge conical surface machining fixture according to claim 6, characterized in that: The support is an adjustable support, the end of the adjustable support close to the base is a threaded end, a screw hole is provided on the base for the adjustable support to be installed, and a nut is sleeved on the threaded end of the adjustable support.

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