Tool for CT thickness measurement of blade and design method thereof
By designing a tooling for blade CT thickness measurement, the problem of non-fixed blade position was solved, enabling automatic identification of wall thickness points, improving measurement efficiency and reducing costs, and adapting to blades of different part numbers.
Patent Information
- Application Number
- CN202511511386.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-01-09
AI Technical Summary
During the blade CT thickness measurement process, the blade placement position is not fixed, which makes it impossible to automatically identify the wall thickness point position, resulting in low efficiency. Furthermore, the existing tooling cannot adapt to blades of different part numbers.
Design a tooling for blade CT thickness measurement, including a universal base, a clamping module, a positioning pin and a limiting block. The central positioning pin fixes the position, the limiting block restricts circumferential rotation, the clamping module ensures blade stability, and the plastic rod distinguishes the blade sequence to achieve automatic identification of wall thickness points.
It enables the fixing of blade position and automatic identification of wall thickness points, improves thickness measurement efficiency, reduces costs, adapts to blades of different part numbers, and saves tooling manufacturing costs.
Smart Images
Figure CN121297741A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of CT thickness measurement fixtures for hollow blades, and specifically to a fixture for CT thickness measurement of blades and its design method. Background Technology
[0002] The wall thickness of single-crystal hollow blades for aero-engines requires measurement. The measurement primarily employs two methods: ultrasonic testing and industrial CT (Computed Tomography) testing. With the increasing complexity of single-crystal hollow blade structures and the development requirements for double-walled blades, industrial CT is being used more extensively in single-crystal hollow blade wall thickness measurement. However, in the CT thickness measurement process, the blade is typically placed directly on the equipment for inspection, or a fixture is designed, with each fixture only able to hold one blade. This results in an inconsistent blade placement on the equipment, preventing automatic identification of the wall thickness measurement point and necessitating manual selection, leading to low efficiency. Summary of the Invention
[0003] To solve the above-mentioned technical problems, the present invention provides a tooling for blade CT thickness measurement and its design method; the specific technical solution is as follows: A tooling for blade thickness measurement by CT includes a plastic rod, a clamping module, a positioning pin, a universal base, a limit block, and a central positioning post; The outline diameter of the universal base is consistent with the diameter of the industrial CT measurement platform, and a central positioning post is provided in the center that matches the central hole of the industrial CT measurement platform. This central positioning post is used to fix the position of the base. The limiting blocks are distributed and installed on one side of the universal base along the circumference. The internal hexagonal head screws b and c pass through the limiting blocks and are installed on the universal base to limit the circumferential rotation of the universal base. The clamping module includes replacement block a and replacement block b; The replacement block a and replacement block b are fastened to each other by hexagonal head screw a to form a clamping space, so that the clamping part of the replacement block contacts the basin side and back side of the blade tenon, and an opening is provided on the intake side or exhaust side to facilitate the loading and unloading of the blade. Use hex socket head cap screw a to ensure stable blade clamping without interfering with the thickness measurement area; install replacement block b on the universal base using locating pins; locating pins are used to precisely align replacement block b with the universal base; The design incorporates a blade sequence differentiation mechanism. Multiple locations are marked on the universal base, and the blade sequence is differentiated by machining holes at designated locations and placing plastic rods, thereby enabling automatic identification of the wall thickness section view.
[0004] The preferred embodiment of the tooling for blade CT thickness measurement is as follows: the clamping part of the replacement block is provided with a groove adapted to the tenon basin side and back side of the blade, designed according to the tenon shape of the blade casting, and the groove depth matches the tenon thickness, as well as a limiting structure on the air intake side or exhaust side, and the other side is open to facilitate blade loading and unloading; the blade basin direction faces the center of the tooling, avoiding the thickness measurement section, and the edge of the open structure side is rounded.
[0005] The preferred embodiment of the tooling for blade CT thickness measurement is that the replacement block a and the replacement block b are interchangeable to adapt to blades of different part numbers. The tooling can be universally applicable simply by designing and manufacturing the corresponding replacement blocks.
[0006] The preferred embodiment of the tooling for blade CT thickness measurement is that, when designing the blade measurement sequence differentiation mechanism, it specifically includes marking the positions of multiple blades with the numbers 1, 2, 3, 4, and 5 on the universal base. Drill one hole at position 1 and place one plastic rod there. Drill two holes at position 2 and place two plastic rods there, and so on. The number of plastic rods is used to distinguish the order of the blades, ensuring that the wall thickness section view corresponds one-to-one with the blade.
[0007] The preferred embodiment of the tooling for blade CT thickness measurement is that the central positioning post is interference-fitted with the central hole of the universal base, and the height of the central positioning post is 1-3 cm higher than the upper surface of the universal base.
[0008] A design method for a tooling for blade thickness measurement using CT includes the following steps: Step 1: Universal base design; The outline diameter of the universal base is determined according to the diameter of the industrial CT measurement stage. The center hole of the universal base is machined according to the diameter of the center hole of the stage. The center positioning pin is assembled in the center hole. The universal base is reserved with space for the installation of replacement blocks, and a pin hole adapted to the positioning pin is pre-set on one side of the installation space. Step Two: Positioning Design; The positioning pin is machined according to the size of the replacement block so that it can pass through the pre-set pin holes of the replacement block and the universal base to fix their positions; the width of the limiting block is determined according to the industrial CT structure, and the limiting block is fixed to the edge of the universal base to restrict the circumferential rotation of the universal base. Step 3: Clamping structure design; Based on the tenon structure of the blade casting to be tested, replacement block a and replacement block b are designed. Replacement block a and replacement block b are fastened to each other by hexagonal head screws a to form a clamping space. This clamping space is the contact surface of the replacement block. The replacement block can fit against the side and back of the tenon, and an open loading and unloading space is reserved on the air intake or exhaust side of the blade. Pin holes adapted to the positioning pins are pre-set on the replacement block and the universal base. The positioning pins are used to ensure that the position of the replacement block is fixed relative to the universal base. After assembly, the blade blade face is oriented towards the center of the tooling. Step 4: Logo Design; Mark the placement positions of blades 1-5 on the universal base. Machin one mounting hole at position 1 and two mounting holes at position 2. Prepare plastic rods that fit the mounting holes. Step 5: Tooling assembly; Insert the positioning pin through the pin hole of the replacement block and the universal base, and tighten the replacement block with the internal hexagonal head screw a; insert the plastic rod into the mounting holes at positions 1 and 2 respectively; clamp the blade to be measured in the clamping space formed by replacement block a and replacement block b, and fix the universal base on the industrial CT measurement platform through the central positioning post, with the limit block stuck in the groove, thus completing the tooling assembly and preparation for blade CT thickness measurement.
[0009] The preferred embodiment of the design method for a tooling for blade CT thickness measurement is that the internal hexagonal head screw a in step three can be replaced with a manually tightened wing screw. Beneficial effects
[0010] This invention addresses the problems of inconsistent blade placement, limited automatic identification of thickness measurement points, and low efficiency in reading wall thickness values during CT thickness measurement through optimized design of a dedicated CT thickness measurement fixture. Simultaneously, a universal base fixture is designed to fix the blade placement position, facilitating automatic identification of wall thickness point locations. Different blades utilize replacement blocks; by adding a new thickness measurement part number and designing and manufacturing the replacement block, different part numbers can share the same base fixture, saving costs. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of a tooling structure used for blade thickness measurement using CT. Figure 2 This is a front view of a tooling used for blade thickness measurement using CT. Figure 3 A bottom view of a tooling used for blade CT thickness measurement; Figure 4 Top view of the rotating device for removing part of the replacement block; Figure 5 The main view connecting replacement block a and replacement block b; Figure 6 A top view showing the connection between replacement block a and replacement block b; Figure 7 A top view showing the connection between replacement block a and replacement block b.
[0012] In the diagram: 1-Plastic rod; 2-Replacement block a; 3-Replacement block b; 4-Positioning pin; 5-Hex socket head cap screw a; 6-Universal base; 7-Limiting block; 8-Center positioning pin; 9-Hex socket head cap screw b; 10-Hex socket head cap screw c. Detailed Implementation
[0013] The following is in conjunction with the appendix Figure 1-7 The present invention will be described in detail, but the scope of protection of the present invention is not limited by the accompanying drawings.
[0014] A tooling for blade thickness measurement by CT includes a plastic rod 1, a clamping module, a positioning pin 4, a universal base 6, a limiting block 7, and a central positioning post 8; The outline diameter of the universal base 6 is consistent with the diameter of the industrial CT measurement platform, and a central positioning post 8 is provided in the center that matches the central hole of the industrial CT measurement platform. The central positioning post 8 is used to fix the position of the base. The limiting block 7 is installed on one side of the universal base 6 along the circumference. The internal hexagonal head screws b9 and c10 pass through the limiting block 7 and are installed on the universal base 6 to limit the circumferential rotation of the universal base 6. The clamping module includes replacement block a2 and replacement block b3; The replacement block a2 and the replacement block b3 are fastened to each other by the internal hexagonal head screw a5 to form a clamping space, so that the clamping part of the replacement block contacts the basin side and back side of the blade tenon, and an opening is provided on the air intake side or the exhaust side to facilitate the loading and unloading of the blade. Use hex socket head cap screws a5 to ensure stable blade clamping and to avoid interfering with the thickness measurement area; install replacement block b3 on universal base 6 using locating pin 4; locating pin 4 is used to precisely align replacement block b3 with universal base 6. The design incorporates a blade sequence differentiation mechanism. Multiple locations are marked on the universal base 6, and the blade sequence is differentiated by machining holes at designated locations and placing plastic rods 1, thereby enabling automatic identification of the wall thickness section view.
[0015] The clamping part of the replacement block is provided with a groove that matches the tenon side and back side of the blade. It is designed according to the tenon shape of the blade casting, and the groove depth matches the tenon thickness. It also has a limiting structure on the air intake or exhaust side, and the other side is open to facilitate blade loading and unloading. The blade's blade basin direction faces the center of the tooling, avoiding the thickness measurement section, and the edge of the open structure is rounded.
[0016] The replacement block a2 and replacement block b3 are interchangeable to accommodate blades of different part numbers. The tooling can be universally applicable simply by designing and manufacturing the corresponding replacement blocks.
[0017] When designing the mechanism for distinguishing the order of measuring blades, the specific steps include marking the positions of multiple blades on the universal base 6 with the letters 1, 2, 3, 4, and 5. Drill one hole at position 1 and place one plastic rod 1. Drill two holes at position 2 and place two plastic rods 1, and so on. The number of plastic rods 1 is used to distinguish the order of the blades, ensuring that the wall thickness section view corresponds one-to-one with the blade.
[0018] The central positioning post 8 is interference-fitted with the central hole of the universal base 6, and the height of the central positioning post 8 is 3cm higher than the upper surface of the universal base 6.
[0019] A design method for a tooling for blade thickness measurement using CT includes the following steps: Step 1: Universal base design; The outline diameter of the universal base 6 is determined according to the diameter of the industrial CT measurement stage. The center hole of the universal base is machined according to the diameter of the center hole of the stage. The center positioning post 8 is assembled in the center hole. The universal base 6 is reserved with space for the installation of replacement blocks, and a pin hole adapted to the positioning pin 4 is preset on one side of the installation space. Step Two: Positioning Design; The positioning pin is machined according to the size of the replacement block so that the positioning pin 4 can pass through the pin holes of the replacement block and the universal base 6 to fix their positions; the width of the limiting block 7 is determined according to the industrial CT structure, and the limiting block 7 is fixed to the edge of the universal base 6 to restrict the circumferential rotation of the universal base 6. Step 3: Clamping structure design; Based on the tenon structure of the blade casting to be tested, replacement blocks a2 and b3 are designed. Replacement blocks a2 and b3 are fastened to each other by hexagonal head screws 5 to form a clamping space. This clamping space is the contact surface of the replacement blocks. The replacement blocks can fit against the side and back of the tenon, and an open loading and unloading space is reserved on the air intake or exhaust side of the blade. Pin holes adapted to positioning pins 4 are pre-set on the replacement blocks and the universal base 6. Positioning pins 4 are used to ensure that the position of the replacement blocks is fixed relative to the universal base 6. After assembly, the blade blade face is oriented towards the center of the tooling. Step 4: Logo Design; Mark the placement positions of blades 1-5 on the universal base 6. Machin one mounting hole at position 1 and two mounting holes at position 2. Prepare a plastic rod 1 that fits the mounting holes. Step 5: Tooling assembly; Insert the positioning pin 4 through the pin hole of the replacement block and the universal base 6, and tighten the replacement block with the internal hexagonal head screw a5; insert the plastic rod 1 into the mounting holes at positions 1 and 2 respectively; clamp the blade to be measured in the clamping space formed by the replacement block a2 and the replacement block b3, and fix the universal base 6 on the industrial CT measurement platform through the central positioning post 8, with the limit block stuck in the groove, thus completing the tooling assembly and preparation for blade CT thickness measurement.
[0020] In step one, the number of replacement block installation spaces for the universal base 6 is 5 sets, and each set of installation spaces corresponds to one blade placement position.
Claims
1. A fixture for CT thickness measurement of blades, characterized in that, Includes a plastic rod (1), a clamping module, a positioning pin (4), a universal base (6), a limit block (7), and a central positioning post (8); The outline diameter of the universal base (6) is consistent with the diameter of the industrial CT measurement platform, and a central positioning post (8) matching the central hole of the industrial CT measurement platform is provided in the center. The central positioning post (8) is used to fix the position of the base. The limiting block (7) is installed on one side of the universal base (6) along the circumference. The internal hexagonal head screws b (9) and c (10) pass through the limiting block (7) and are installed on the universal base (6) to limit the circumferential rotation of the universal base (6). The clamping module includes replacement block a (2) and replacement block b (3); The replacement block a (2) and the replacement block b (3) are fastened to each other by the internal hexagonal head screw a (5) to form a clamping space, so that the clamping part of the replacement block contacts the basin side and back side of the blade tenon, and an opening is provided on the air intake side or the exhaust side to facilitate the loading and unloading of the blade. Use hex socket head cap screw a (5) to ensure stable blade clamping and without interfering with the thickness measurement area; install replacement block b (3) on universal base (6) using locating pin (4); locating pin (4) is used to precisely align replacement block b (3) with universal base (6); The design of the blade sequence differentiation mechanism involves marking multiple positions on the universal base (6) and differentiating the blade sequence by machining holes at designated positions and placing plastic rods (1) to achieve automatic identification of the wall thickness section view.
2. The fixture for blade CT thickness measurement according to claim 1, characterized in that, The clamping part of the replacement block is provided with a groove that matches the tenon side and back side of the blade. It is designed according to the tenon shape of the blade casting, and the groove depth matches the tenon thickness. It also has a limiting structure on the air intake or exhaust side, and the other side is open to facilitate blade loading and unloading. The blade's blade basin direction faces the center of the tooling, avoiding the thickness measurement section, and the edge of the open structure is rounded.
3. The fixture for blade CT thickness measurement according to claim 1, characterized in that, The replacement block a (2) and replacement block b (3) can be replaced to adapt to blades of different part numbers. Only the corresponding replacement blocks need to be designed and manufactured to achieve the universality of the tooling.
4. The fixture for blade CT thickness measurement according to claim 1, characterized in that, When designing the mechanism for distinguishing the order of measuring blades, the specific steps include marking the positions of multiple blades with the letters 1, 2, 3, 4, and 5 on the universal base (6); Drill one hole at position 1 and place one plastic rod (1). Drill two holes at position 2 and place two plastic rods (1). Continue in this manner. The number of plastic rods (1) is used to distinguish the order of the blades, ensuring that the wall thickness section view corresponds one-to-one with the blade.
5. The fixture for blade CT thickness measurement according to claim 1, characterized in that, The central positioning post (8) is interference-fitted with the central hole of the universal base (6), and the height of the central positioning post (8) is 1-3cm higher than the upper surface of the universal base (6).
6. A design method for a tooling for blade CT thickness measurement according to claims 1-5, characterized in that, Includes the following steps: Step 1: Universal base design; The outline diameter of the universal base (6) is determined according to the diameter of the industrial CT measurement stage. The center hole of the universal base is machined according to the diameter of the center hole of the stage. The center positioning column (8) is assembled in the center hole. The installation space for the replacement block is reserved on the universal base (6), and a pin hole adapted to the positioning pin (4) is preset on one side of the installation space. Step Two: Positioning Design; The positioning pin is processed according to the size of the replacement block so that the positioning pin (4) can pass through the pin holes of the replacement block and the universal base (6) to fix their positions; the width of the limiting block (7) is determined according to the industrial CT structure, and the limiting block (7) is fixed to the edge of the universal base (6) to restrict the circumferential rotation of the universal base (6); Step 3: Clamping structure design; Based on the tenon structure of the blade casting to be tested, replacement block a (2) and replacement block b (3) are designed. Replacement block a (2) and replacement block b (3) are fastened to each other by internal hexagonal head screw a (5) to form a clamping space. This clamping space is the contact surface of the replacement block. The replacement block can fit against the side and back of the tenon basin, and an open loading and unloading space is reserved on the side of the blade intake or exhaust. Pin holes adapted to the positioning pin (4) are pre-set on the replacement block and the universal base (6). The positioning pin (4) is used to ensure that the position of the replacement block is fixed relative to the universal base (6). After assembly, the blade basin faces the center of the tooling. Step 4: Logo Design; Mark the positions of blades 1-5 on the universal base (6), machine one mounting hole at position 1 and two mounting holes at position 2, and prepare a plastic rod (1) that fits the mounting holes. Step 5: Tooling assembly; Insert the positioning pin (4) through the pin hole of the replacement block and the universal base (6), and tighten the replacement block with the internal hexagonal head screw a (5); insert the plastic rod (1) into the mounting holes at positions 1 and 2 respectively; clamp the blade to be measured in the clamping space formed by the replacement block a (2) and the replacement block b (3), and fix the universal base (6) on the industrial CT measurement platform through the central positioning column (8), with the limit block stuck in the groove, thus completing the tooling assembly and blade CT thickness measurement preparation.
7. The design method of a tooling for blade CT thickness measurement according to claim 6, characterized in that, In step three, the internal hex socket head cap screw a (5) can be replaced with a manually tightened wing screw.