Measuring device for torsional angle of blade die forging and measuring method based on torsional angle of blade die forging

Abstract

The invention discloses a device for measuring the torsional angle of a blade die forging and a measuring method based on the torsional angle, and relates to the technical field of geometric parameter detection of blade die forgings. The method comprises the following steps: moving the measuring device to enable the two measuring probes to respectively contact with the front edge and the rear edge of a measured tangent plane, and reading an angle value displayed on the digital display screen on the electronic bevel protractor; the torsional angle is calculated according to the read angle value, and when the angle value is an acute angle, the angle value is the torsional angle; if the angle value is an obtuse angle, the angle value is subtracted from 360 degrees, and the difference value is a torsional angle; measuring angle values of other tangent planes and calculating torsional angles; and recording torsional angle values of all the sections, and comparing the torsional angle values with a design drawing, so as to judge whether the paddle die forging is qualified or not. The blade die forging torsional angle measuring device and the torsional angle measuring method based on the blade die forging torsional angle measuring device can be obtained.

Description

Technical Field

[0001] This invention relates to the field of geometric parameter detection technology for propeller blade forgings, specifically to a measuring device for the torsion angle of propeller blade forgings and a method for measuring the torsion angle. Background Technology

[0002] The main applications of aluminum alloy forged propeller blades are: military aircraft propellers, wind tunnel blades, etc.; and fan blades for large-scale civilian ventilation facilities, etc. The torsion angle is the most important geometric element, and its measurement is a crucial step in the inspection process. Torsion angle measurement is used throughout the entire propeller blade production process: during the trial molding stage of new molds, torsion angle measurement is needed to verify whether the mold forming accuracy meets the design goals; during long-term use of the mold, the torsion angle of the forgings needs to be checked regularly to determine if there is a risk of mold failure such as wear or deformation; after forgings undergo quenching, heat treatment, and other processes, they are prone to torsional deformation due to the release of thermal stress, and torsion angle measurement is needed to guide straightening operations to ensure that the torsion angle of the final product is controlled within the design tolerance range.

[0003] Existing methods for measuring the torsion angle of blade forgings have significant limitations. The specific operating procedure is as follows:

[0004] (1) Alignment steps: Place the blade forging on the scribing inspection platform and use a special clamping fixture for multi-point support and positioning. Use the parting line between the blade root and blade tip or the front and rear edges of the cut surface with a reference twist angle of 0° as the reference surface. Adjust the support height and horizontal position of the clamping fixture, and use a height gauge in conjunction with scribing to calibrate each reference, so that the normal direction of the twist angle of each cut surface to be measured is parallel to the inspection platform. Then, according to the longitudinal reference line of the blade, apply a colorant to the blade surface, and manually draw the position lines of each measured cut surface according to the cut surface spacing marked on the design drawings. These position lines serve as the reference marks for subsequent twist angle measurements.

[0005] (2) Measurement steps: The measurement process requires a variety of measuring tools such as a 360° mechanical angle ruler (with a measurement accuracy of only 5'), vernier calipers, and wide-base angle rulers, and at least three operators are required to work together. One person holds the vernier caliper and precisely adjusts the position of the tip of the caliper to the front and rear edges of the blade tangent line, and keeps the caliper stable to avoid movement; another person places one measuring end of the mechanical angle ruler tightly against the extension part of the vernier caliper body to ensure a tight fit, and at the same time places the other measuring end of the angle ruler against the vertical reference surface of the wide-base angle ruler; the third person needs to observe the positioning accuracy of the measuring probe and the tightness of the fit of the measuring tools in real time. After confirming that the measurement requirements are met, the third person signals the second person to lock the scale fixing mechanism of the angle ruler, and then removes the angle ruler to read the measurement value and compares it with the design tolerance to determine the qualification.

[0006] The above measurement method has the following drawbacks: First, the personnel configuration cost is high, and the measurement accuracy is easily affected by human operation deviation during collaborative operation; second, the reading accuracy of the mechanical angle ruler is low, which cannot meet the detection requirements of high-precision blades; third, the measurement process has many steps, and each measurement takes a long time, resulting in low detection efficiency; fourth, the fit of the measuring instrument depends on manual judgment, which can easily produce contact gaps and lead to measurement errors. Summary of the Invention

[0007] The purpose of this invention is to solve the above-mentioned technical problems by providing a measuring device for the torsion angle of a propeller forging and a measuring method based on the torsion angle.

[0008] A device for measuring the torsion angle of a propeller forging includes a height adjustment assembly, an angle measurement assembly, a probe positioning assembly, and a locking and fixing assembly. The height adjustment assembly includes a height gauge 1, a height gauge seat groove 16, a height gauge vernier gauge seat 14, a height gauge lifting knob 15, and a height gauge vernier gauge fastening bolt 13. The angle measurement assembly includes an electronic angle gauge 2, an angle gauge measuring main body 7, an angle gauge rotating shaft 12, and an angle gauge fastening nut 17. The probe positioning assembly includes a first-order clamping slider 8, a second-order clamping slider 10, a first-order measuring probe 5, and a second-order measuring probe 3. The locking and fixing assembly includes a first-order fastening nut 6, a second-order fastening nut 4, a first-order knurled locking bolt 9, and a second-order knurled locking bolt 11.

[0009] The height gauge 1 is fitted with a height gauge seat groove 16 and a height gauge vernier scale seat 14 along the axial direction. The height gauge lifting knob 15 controls the height gauge vernier scale seat 14 to rise and fall along the axial direction, and the height gauge vernier scale seat 14 is locked to the height gauge 1 by the height gauge vernier fastening bolt 13. The height gauge seat groove 16 is connected to the height gauge vernier scale seat 14 and rises and falls synchronously with the height gauge vernier scale seat 14 along the axial direction of the height gauge 1.

[0010] The electronic angle ruler 2 is fixed to the height ruler seat groove 16 by bolts. The main body of the angle ruler measuring scale 7 is rotatably connected to the electronic angle ruler 2 through the angle ruler rotating shaft 12. It is locked by the angle ruler fastening nut 17 and kept at a certain angle with the electronic angle ruler 2.

[0011] Both the No. 1 clamping frame slider 8 and the No. 2 clamping frame slider 10 are fitted onto the main body 7 of the angle ruler measuring scale and are fastened to the main body 7 of the angle ruler measuring scale by the No. 1 knurled locking bolt 9 and the No. 2 knurled locking bolt 11, respectively. The bottom surface of both the No. 1 clamping frame slider 8 and the No. 2 clamping frame slider 10 is provided with a round hole. The head of both the No. 1 measuring probe 5 and the No. 2 measuring probe 3 is conical, and the tail is provided with an external thread. The tail of the No. 1 measuring probe 5 is set in the round hole on the bottom surface of the No. 1 clamping frame slider 8 and is fastened to the No. 1 clamping frame slider 8 by the No. 1 fastening nut 6. The tail of the No. 2 measuring probe 3 is set in the round hole on the bottom surface of the No. 2 clamping frame slider 10 and is fastened to the No. 2 clamping frame slider 10 by the No. 2 fastening nut 4.

[0012] The method for measuring the torsion angle of a blade forging using the aforementioned measuring device is performed according to the following steps:

[0013] Step S1:

[0014] Place the blade forging on the testing platform and adjust its position so that the conical heads of the two measuring probes are perpendicular to the surfaces of the leading and trailing edges of the measured section.

[0015] Step S2:

[0016] Move the measuring device so that the two measuring probes contact the front and rear edges of the cut surface being measured, and read the angle value displayed on the digital display screen of the electronic angle ruler 2.

[0017] Step S3:

[0018] The torsion angle is calculated based on the read angle value. When the angle value is acute, the angle value is the torsion angle; if the angle value is obtuse, the angle value is subtracted from 360°, and the difference is the torsion angle.

[0019] Step S4:

[0020] Following steps S2 and S3, measure the angle values ​​of other cut surfaces and calculate the torsion angle;

[0021] Step S5:

[0022] Record the torsion angle values ​​of all cross-sections and compare them with the design drawings to determine whether the blade forging is qualified.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention provides a torsion angle measuring device for propeller blade forgings with a reasonable structural design and simple operation. It also provides a torsion angle measuring method based on the device. While ensuring that the measurement accuracy is better than that of the prior art, it simplifies the operation process, reduces the number of operators, shortens the single measurement time, improves the inspection efficiency and the repeatability and reliability of the measurement results, and provides technical support for the high-quality production of propeller blade forgings.

[0025] 2. Significantly Improved Measurement Accuracy: This invention uses an electronic angle gauge with an accuracy of 0.1° as the core measuring component, combined with a high-precision height gauge and a customized measuring probe. This effectively avoids the reading errors of traditional mechanical measuring tools and the measurement deviations caused by manual fitting gaps. Actual verification shows that the error of a single measurement is less than 0.3°, and the repeatability error of multiple measurements is less than 0.1°. The measurement accuracy far exceeds that of existing methods, meeting the inspection requirements of high-precision propeller forgings.

[0026] 3. Significantly simplified operation process: Through integrated structural design, the functions of height adjustment, angle measurement, and probe positioning are integrated into one, eliminating the cumbersome operation steps such as scribing and multiple measuring tools in traditional methods. The measurement process can be completed by only one operator. Compared with the existing method that requires three people to work together, the personnel configuration is greatly reduced, and labor costs and collaborative operation errors are reduced.

[0027] 4. Significantly improved detection efficiency: The device adopts a modular assembly design, which can quickly adapt and adjust to different blades. A single cross-section measurement takes only about 30 seconds. Compared with the traditional method, which takes 5-10 minutes per cross-section, the detection efficiency is improved by more than 10 times. It is especially suitable for high-efficiency detection in mass production scenarios and effectively shortens the product production cycle.

[0028] 5. Wide applicability and high operational safety: The measuring probe adopts a conical head design, which is suitable for measuring blades made of various materials such as aluminum alloy and titanium alloy; the sliding stroke of the clamping frame slider and the adjustment range of the height gauge can meet the detection needs of blades of different sizes and models; the overall structure of the device is stable, the locking mechanism is reliable, there are no easily damaged parts during the measurement process, the service life is long, and the maintenance cost is low.

[0029] 6. Convenient data recording and traceability: The digital display function of the electronic angle ruler can directly read the measured values, avoiding the subjective error of manual reading, facilitating the generation of digital inspection reports, realizing full traceability of product quality, and providing data support for quality control in the production process.

[0030] The present invention provides a measuring device for the torsion angle of a propeller forging and a measuring method based on the torsion angle. Attached Figure Description

[0031] Figure 1This is a schematic diagram of the structure of the measuring device for the torsion angle of the propeller forging of the present invention. 1 represents a height gauge, 2 represents an electronic angle gauge, 3 represents measuring probe No. 2, 4 represents fastening nut No. 2, 5 represents measuring probe No. 1, 6 represents fastening nut No. 1, 7 represents the main measuring scale body of the angle gauge, 8 represents the clamping frame slider No. 1, 9 represents the knurled locking bolt No. 1, 10 represents the clamping frame slider No. 2, 11 represents the knurled locking bolt No. 2, 12 represents the angle gauge rotating shaft, 13 represents the height gauge vernier fastening bolt, 14 represents the height gauge vernier scale seat, 15 represents the height gauge lifting knob, 16 represents the height gauge scale seat groove, and 17 represents the angle gauge fastening nut.

[0032] Figure 2 A schematic diagram showing the materials used in the manufacturing of the clamping frame slider and the measuring probe;

[0033] Figure 3 A schematic diagram showing the cutting of the main material of the clamping frame slider;

[0034] Figure 4 A schematic diagram showing the bonding, drilling, and riveting of the main body of the clamping frame slider and the liner plate.

[0035] Figure 5 A schematic diagram showing the bonding, drilling, and riveting of the main body of the clamping frame slider and the liner plate.

[0036] Figure 6 A schematic diagram showing the assembly structure of the measuring probe and the clamping frame slider;

[0037] Figure 7 A schematic diagram showing the modified electronic angle gauge;

[0038] Figure 8 A schematic diagram showing the modified electronic angle ruler. Detailed Implementation

[0039] Specific Implementation Method 1: This embodiment provides a measuring device for the torsion angle of a blade forging, comprising a height adjustment assembly, an angle measuring assembly, a probe positioning assembly, and a locking and fixing assembly. The height adjustment assembly includes a height gauge 1, a height gauge seat groove 16, a height gauge vernier gauge seat 14, a height gauge lifting knob 15, and a height gauge vernier gauge fastening bolt 13. The angle measuring assembly includes an electronic angle gauge 2, an angle gauge measuring main body 7, an angle gauge rotating shaft 12, and an angle gauge fastening nut 17. The probe positioning assembly includes a No. 1 clamping frame slider 8, a No. 2 clamping frame slider 10, a No. 1 measuring probe 5, and a No. 2 measuring probe 3. The locking and fixing assembly includes a No. 1 fastening nut 6, a No. 2 fastening nut 4, a No. 1 knurled locking bolt 9, and a No. 2 knurled locking bolt 11.

[0040] The height gauge 1 is fitted with a height gauge seat groove 16 and a height gauge vernier scale seat 14 along the axial direction. The height gauge lifting knob 15 controls the height gauge vernier scale seat 14 to rise and fall along the axial direction, and the height gauge vernier scale seat 14 is locked to the height gauge 1 by the height gauge vernier fastening bolt 13. The height gauge seat groove 16 is connected to the height gauge vernier scale seat 14 and rises and falls synchronously with the height gauge vernier scale seat 14 along the axial direction of the height gauge 1.

[0041] The electronic angle ruler 2 is fixed to the height ruler seat groove 16 by bolts. The main body of the angle ruler measuring scale 7 is rotatably connected to the electronic angle ruler 2 through the angle ruler rotating shaft 12. It is locked by the angle ruler fastening nut 17 and kept at a certain angle with the electronic angle ruler 2.

[0042] Both the No. 1 clamping frame slider 8 and the No. 2 clamping frame slider 10 are fitted onto the main body 7 of the angle ruler measuring scale and are fastened to the main body 7 of the angle ruler measuring scale by the No. 1 knurled locking bolt 9 and the No. 2 knurled locking bolt 11, respectively. The bottom surface of both the No. 1 clamping frame slider 8 and the No. 2 clamping frame slider 10 is provided with a round hole. The head of both the No. 1 measuring probe 5 and the No. 2 measuring probe 3 is conical, and the tail is provided with an external thread. The tail of the No. 1 measuring probe 5 is set in the round hole on the bottom surface of the No. 1 clamping frame slider 8 and is fastened to the No. 1 clamping frame slider 8 by the No. 1 fastening nut 6. The tail of the No. 2 measuring probe 3 is set in the round hole on the bottom surface of the No. 2 clamping frame slider 10 and is fastened to the No. 2 clamping frame slider 10 by the No. 2 fastening nut 4.

[0043] Specific Implementation Method Two: The difference between this implementation method and Specific Implementation Method One is that the height range of the height gauge 1 is 80~1000 mm.

[0044] The other steps are the same as in Specific Implementation Method 1.

[0045] Specific Implementation Method 3: The difference between this implementation method and Specific Implementation Method 1 or 2 is that the measuring range of the main scale body 7 of the angle ruler is 0~360°.

[0046] The other steps are the same as in Specific Implementation Method 1 or 2.

[0047] Specific Implementation Method Four: The difference between this implementation method and Specific Implementation Methods One to Three is that the electronic angle ruler 2 is equipped with a digital display screen, the measurement accuracy is 0.1°, and the error is controlled within ±0.3°.

[0048] The other steps are the same as those in Specific Implementation Methods One to Three.

[0049] Specific Implementation Method 5: The difference between this implementation method and Specific Implementation Methods 1 to 4 is that the adjustment accuracy of the height gauge lifting knob 15 is 0.05 mm.

[0050] The other steps are the same as those in Specific Implementation Methods One through Four.

[0051] Specific Implementation Method Six: The difference between this implementation method and Specific Implementation Methods One to Five is that the sliding distance of the No. 1 clamping frame slider 8 and the No. 2 clamping frame slider 10 is 0~500 mm.

[0052] The other steps are the same as those in Specific Implementation Methods 1 to 5.

[0053] Specific Implementation Method Seven: The difference between this implementation method and Specific Implementation Methods One through Six is ​​that: the No. 1 measuring probe 5 and the No. 2 measuring probe 3 are both... Stainless steel round bars.

[0054] The other steps are the same as those in Specific Implementation Methods 1 to 6.

[0055] Specific Implementation Method Eight: This implementation method for measuring the torsion angle of a blade forging using the aforementioned measuring device is performed according to the following steps:

[0056] Step S1:

[0057] Place the blade forging on the testing platform and adjust its position so that the conical heads of the two measuring probes are perpendicular to the surfaces of the leading and trailing edges of the measured section.

[0058] Step S2:

[0059] Move the measuring device so that the two measuring probes contact the front and rear edges of the cut surface being measured, and read the angle value displayed on the digital display screen of the electronic angle ruler 2.

[0060] Step S3:

[0061] The torsion angle is calculated based on the read angle value. When the angle value is acute, the angle value is the torsion angle; if the angle value is obtuse, the angle value is subtracted from 360°, and the difference is the torsion angle.

[0062] Step S4:

[0063] Following steps S2 and S3, measure the angle values ​​of other cut surfaces and calculate the torsion angle;

[0064] Step S5:

[0065] Record the torsion angle values ​​of all cross-sections and compare them with the design drawings to determine whether the blade forging is qualified.

[0066] Specific Implementation Method Nine: The difference between this implementation method and Specific Implementation Method Eight is that the size of the detection platform is 1.2 m × 1.5 m.

[0067] The other steps are the same as in Specific Implementation Method 8.

[0068] Specific Implementation Method 10: The difference between this implementation method and Specific Implementation Method 8 or 9 is that when measuring the angle value of the cross-section, if the digital display screen shows an angle of 0° or 180°, then the torsion angle of the cross-section is 0°.

[0069] The other steps are the same as in specific implementation method eight or nine.

[0070] The structural design of the measuring device, the assembly process of the measuring device, and the torsion angle measurement method of this embodiment are as follows:

[0071] 1. Structural design of the measuring device:

[0072] A device for measuring the torsion angle of a propeller blade forging includes a height adjustment assembly, an angle measurement assembly, a probe positioning assembly, and a locking and fixing assembly, with the following specific structure:

[0073] Height adjustment assembly: It adopts a high-precision height gauge 1 with a height measurement range of 80~1000 mm, and is also equipped with a height gauge seat groove 16, a height gauge vernier gauge seat 14, a height gauge lifting knob 15, and a height gauge vernier gauge fastening bolt 13. It can realize the horizontal sliding of the entire device along the platform, and the height gauge vernier gauge seat 14 can be raised and lowered vertically along the height gauge body. Fine adjustment can be made by the height gauge lifting knob 15, and the adjustment accuracy can reach 0.05 mm. The height gauge vernier gauge fastening bolt 13 is used to lock the lifting position of the vernier gauge seat to ensure height stability during measurement.

[0074] Angle measuring component: It adopts an electronic angle ruler 2 with a measuring range of 0~360°, and is also equipped with an angle ruler measuring main body 7, an angle ruler rotating shaft 12, and an angle ruler fastening nut 17. The digital display screen of the electronic angle ruler 2 can display the measured angle in real time, with a measurement accuracy of 0.1° and an error controlled within ±0.3°, meeting the requirements of high-precision detection. The angle ruler rotating shaft 12 can realize 360° rotation adjustment of the measuring main body, and the angle ruler fastening nut 17 is used to lock the angle position after rotation.

[0075] The probe positioning assembly includes a No. 1 clamping frame slider 8, a No. 2 clamping frame slider 10, a No. 1 measuring probe 5, and a No. 2 measuring probe 3. Both the No. 1 clamping frame slider 8 and the No. 2 clamping frame slider 10 adopt a sliding structure design, allowing free sliding along the main measuring scale 7 of the angle ruler, with a sliding stroke of 0~500mm, adapting to the measurement needs of blade cross-sections of different widths; the No. 1 measuring probe 5 and the No. 2 measuring probe 3 adopt... It is made of stainless steel round bar, with the head being ground to form a tapered contact end, and the tail of the probe is machined with M3 thread for connection with the clamping frame slider.

[0076] Locking and fixing components: including fastening nut 6, fastening nut 4, knurled locking bolt 9, and knurled locking bolt 11. Fastening nut 6 and fastening nut 4 are used to fix the connection between the measuring probe and the clamping frame slider. Knurled locking bolt 9 and knurled locking bolt 11 are used to lock the position of the clamping frame slider on the main scale body 7 of the angle ruler.

[0077] 2. Assembly process of the measuring device:

[0078] Step 1: Assemble the height gauge, vernier caliper, and angle gauge:

[0079] The height gauge 1 is installed in the height gauge base slot 16. The height gauge vernier scale base 14 slides up and down perpendicularly to the detection platform and can be locked. The base is fixed to one side of the modified electronic angle gauge 2 and the auxiliary clamping block with fastening bolts.

[0080] Step 2: Assemble the measuring probe and the clamping frame slider:

[0081] Pass the threaded end of measuring probe 5 through the mounting hole of slider 8 of clamping frame 1, and initially fix it with fastening nut 6. Similarly, fix measuring probe 3 of measuring probe 2 on slider 10 of clamping frame 2 with fastening nut 4 of measuring probe 2. Adjust the screw-in depth of the probe so that the conical heads of the two measuring probes are on the same horizontal plane, and tighten the fastening nut to complete the fixation.

[0082] Step 3: Assemble the clip-frame slider and angle gauge, and adjust the spacing:

[0083] Mount the No. 1 clamping frame slider 8 and the No. 2 clamping frame slider 10, which are equipped with measuring probes, onto the main scale body 7 of the angle ruler. Adjust the sliding flexibility of the sliders to ensure that there is no jamming. According to the distance between the front and rear edges of the blade section being measured, slide the clamping frame sliders to the appropriate position so that the distance between the two measuring probes matches the distance between the front and rear edges of the section. Then, lock the clamping frame sliders with the No. 1 knurled locking bolt 9 and the No. 2 knurled locking bolt 11 to prevent positional deviation during the measurement process.

[0084] Step 4: Overall device height calibration and adjustment:

[0085] The assembled measuring device is placed on the scribing and testing platform. The overall height of the device is adjusted by using the height gauge lifting knob 15, and the angle is finely adjusted by using the angle gauge rotating shaft 12 to make the connecting busbar of the probe head parallel to the testing platform, thus completing the overall assembly and calibration of the device.

[0086] 3. Twist angle measurement method based on this measuring device:

[0087] Step 1: Blade Positioning and Alignment: Place the blade forging to be measured on a scribing and inspection platform with double zero-precision rating. Use a special support fixture to provide multi-point support for the blade, ensuring stable placement without any wobbling. Using the parting line at the blade root as a reference, adjust the height and horizontal position of the support fixture to calibrate the longitudinal reference of the blade, ensuring that the normal direction of the torsion angle of each section to be measured is parallel to the inspection platform, thus completing the blade positioning and alignment.

[0088] Step 2: Alignment of the measuring device: Push the height gauge seat 16 of the measuring device to slide the device along the detection platform to the position of the first cut surface to be measured. Adjust the height of the device by using the height gauge lifting knob 15 so that the conical heads of the two measuring probes are aligned with the front and rear edge marking lines of the cut surface. Fine-tune the horizontal position of the device to ensure that the contact points between the measuring probes and the front and rear edges of the cut surface are accurate.

[0089] Step 3: Angle Measurement and Value Reading: Gently push the measuring device to make the conical heads of measuring probe 5 (No. 1) and measuring probe 3 (No. 2) make close contact with the front and rear edge surfaces of the blade section, respectively, ensuring that the contact points do not slip or shift. After the digital display screen of the electronic angle ruler 2 stabilizes, read the current angle value and record the measurement data.

[0090] Step 4: Calculate the torsion angle value: Calculate the torsion angle based on the angle value read by the electronic angle gauge 2: When the blade torsion angle is positive, the angle value displayed on the digital display screen is an acute angle, and this acute angle value is the actual torsion angle value; when the torsion angle is negative, the angle value displayed on the digital display screen is an obtuse angle. Subtract this obtuse angle value from 360°, and the result is the actual torsion angle value (negative value); if the angle displayed on the digital display screen is 0° or 180°, it indicates that the torsion angle of the cross-section is 0°.

[0091] Step 5: Continuous measurement of multiple sections: After completing the measurement of the first section, loosen the height gauge vernier fastening bolt 13, push the measuring device along the detection platform to the position of the next section to be measured, repeat the operation of steps two to four, and measure the torsion angle values ​​of all preset sections in sequence. Record the data in time after each measurement to avoid omissions.

[0092] Step Six: Measurement Result Judgment and Recording: Compile and summarize the torsion angle measurement data of all cross-sections, and compare them with the torsion angle standard value and tolerance range marked on the design drawings. If the measured value is within the tolerance range, the torsion angle of the blade forging is deemed qualified; if it exceeds the tolerance range, it is deemed unqualified, and the location of the unqualified cross-section is marked to provide a basis for subsequent straightening operations. Simultaneously, record the measurement data and judgment results in detail in the inspection report for archiving and future reference.

[0093] The beneficial effects of the present invention are verified using the following embodiments:

[0094] Example 1:

[0095] In this embodiment, the measuring device is implemented on a scribing inspection platform with dimensions of 1.2×1.5m and an accuracy class of double zero. This platform needs to be calibrated regularly by a qualified metrology and testing department to ensure that the platform's flatness error meets the measurement reference requirements.

[0096] I. Selection and Modification of Core Components of the Measuring Device:

[0097] 1. Selection and Modification of the Electronic Angle Gauge: A Japanese "Sanryu" brand electronic angle gauge was selected as the core angle measuring component. Its measuring range is 0~360°, with a measurement accuracy of 0.1° and an error of ±0.3°, meeting the accuracy requirements for torsion angle detection of propeller blade forgings. Based on the maximum cross-sectional width of the measured propeller blade, the angle gauge measuring arm size was selected as 1.2×27×500mm, ensuring that the arm length meets the requirements for probe installation and spacing adjustment. To achieve a reliable connection with the height gauge, one side of the electronic angle gauge was modified to machine a connection structure (10×9×200mm) that fits the height gauge's mounting groove (10×10×100mm). A clearance fit was used to ensure that the levelness can be slightly adjusted after connection. After adjustment, the gauge is locked in place with a fastening nut to prevent loosening.

[0098] 2. Height gauge selection: Select a height gauge with a measuring range of 80~1000mm and a measuring accuracy of 0.05mm. The height gauge seat groove allows the entire device to slide smoothly on the platform. The height gauge vernier scale seat is equipped with a high-precision lifting mechanism, which can be finely adjusted by lifting knob to meet the measurement needs of different height sections.

[0099] 3. Material selection and fabrication of the clamping frame and measuring probe:

[0100] The main body of the clamping frame is made of 5mm thick cold-rolled brass plate. This material has excellent machinability, lubricity and wear resistance, and moderate hardness, which can avoid wear on the angle ruler body.

[0101] The clamping frame liner is made of 1.3mm thick cold-rolled copper plate, which is matched with the stainless steel angle ruler body (1.2mm thick). A 0.1mm sliding gap is reserved to ensure smooth sliding of the clamping frame slider. At the same time, the low hardness of the copper plate can protect the angle ruler body from scratches.

[0102] The knurled locking bolts are made of brass and have a knurled surface for easy manual tightening. The thread specification is M3 to ensure that they are compatible with the threaded holes of the clamping frame.

[0103] Selection of measuring probe The stainless steel round bar has good corrosion resistance and mechanical strength. The probe head is ground into a cone shape with a radius of 1.5mm, and the tail is machined with an M3 thread for connection with the clamping frame slider.

[0104] II. Manufacturing process and assembly procedure of clamping frame and measuring probe:

[0105] 1. Material Cutting and Preliminary Processing: According to the dimensions in the design drawings, cut the brass sheet (main frame) and copper sheet (backing plate) to size, leaving a processing allowance of 0.5mm. Use wire cutting technology to ensure a smooth cut surface without burrs or flash.

[0106] 2. Positioning and Bonding Curing: Using CAD software to draw positioning drawings, the main body of the frame and the lining plate are precisely positioned according to the drawings. Epoxy resin adhesive is used to bond the two together, and the mixture is placed in a constant temperature environment (25℃) for 24 hours to ensure that the bonding strength meets the requirements for use.

[0107] 3. Drilling and Tapping: After the bonding and curing process is complete, a CNC drilling machine is used to drill the knurled locking bolt mounting holes and measuring probe mounting holes on the clamping frame. The hole diameter is [missing information]. During drilling, ensure the perpendicularity error of the hole position is less than 0.02mm. Then, use an M3 tap to tap the drilled hole to ensure clear threads and no stripping.

[0108] 4. Fine machining and polishing: The edges of the clamping frame and the mounting holes are filed to remove machining allowances. Then, metallographic sandpaper is used for fine polishing to make the surface roughness Ra≤0.8μm of the clamping frame to ensure smooth sliding.

[0109] 5. Measurement probe machining: Cut the stainless steel round bar to the designed length, grind the round bar with an external cylindrical grinder to ensure that the diameter tolerance is controlled within ±0.01mm, then perform tapered grinding on the head, and finally machine the tail with an M3 thread on a lathe to complete the manufacturing of the measurement probe.

[0110] 6. Component assembly:

[0111] Probe and clamp assembly: Screw the threaded end of measuring probe No. 1 into the threaded hole of clamp slider No. 1, adjust the screwing depth of the probe so that the probe head protrudes 5mm from the surface of the clamp, and lock it in place with fastening nut No. 1; similarly complete the assembly of measuring probe No. 2 with clamp slider No. 2, ensuring that the heads of the two probes are on the same horizontal plane and the height difference is less than 0.01mm.

[0112] Assembly of clamping frames and angle ruler: Place the two clamping frame sliders with the assembled probes onto the measuring main scale of the electronic angle ruler, and adjust the sliding performance of the sliders to ensure that the sliders can slide smoothly along the scale.

[0113] III. Verification and Use of this Device:

[0114] (a) Device calibration and verification

[0115] A standard verification system was established on the double-zero grade scribing testing platform. A vernier angle gauge (verified by a national metrology institution, with a torsion error ≤ ±0.05°) was selected to perform full-range calibration verification of this measuring device.

[0116] 1. Using a vernier angle gauge, complete the alignment and positioning operations according to the measurement procedure of this device. Repeat the measurement 10 times for each standard torsion angle value and record the measurement data for each measurement.

[0117] 2. The deviation between each measured value and the standard value was calculated. The results showed that the maximum deviation of a single measurement was ±0.08°, the average deviation was ±0.03°, and the range of 10 repeated measurements was ≤0.1°, all of which met the accuracy requirements for the torsion angle detection of propeller forgings (allowable error ≤±0.3°).

[0118] 3. Comparison and verification with traditional measurement methods: Three actual production blade forging parts were selected, and the torsion angle of the same set of cross-sections (a total of 12 cross-sections) was measured using both this device and the traditional "three measuring tools + three people working together" method. The maximum difference between the measurement results of the two methods was 0.12°, and the measurement time of this device was only 1 / 10 of that of the traditional method, which verified the superior accuracy and efficiency of this device.

[0119] (II) Actual Usage and Operation Procedures

[0120] 1. Preliminary preparation: Check whether the connections of all components of the measuring device are secure, whether the digital display screen of the electronic angle ruler is normal, whether the head of the measuring probe is free from wear and deformation, and whether the calibration marks of the height ruler and angle ruler are within the validity period; clean the oil, iron filings and other impurities from the scribing test platform and the measuring surface of the blade to avoid affecting the measurement contact accuracy.

[0121] 2. Blade clamping and alignment: Place the blade forging to be tested stably on the special support fixture of the testing platform. Using the blade root end face and the parting line as the reference, adjust the clamping mechanism of the support fixture to make the longitudinal axis of the blade parallel to the platform guide rail. Use a level to calibrate the blade levelness and ensure that the normal of the torsion angle of each measured section is parallel to the platform plane. After alignment, lock the support fixture.

[0122] 3. Device debugging and alignment: According to the position of the cut surface to be measured marked on the blade design drawing (such as 50mm, 100mm, 150mm from the blade root, etc.), slide the height gauge seat groove of the measuring device to the first cut surface position. Adjust the height of the device by using the height gauge lifting knob to align the head of the measuring probe with the front and rear edge markings of the cut surface. Adjust the probe spacing by sliding the clamping frame slider to ensure that the probe is accurately aligned with the front and rear edge of the cut surface. Tighten the knurled locking bolts.

[0123] 4. Torsion Angle Measurement and Data Recording: Gently push the device to make the two measuring probes make close contact with the blade surface. After the electronic angle gauge reading stabilizes, read the angle value and calculate the actual torsion angle according to the conversion rules. Record the section position, measured value, and converted torsion angle value into the inspection table one by one. Then loosen the height gauge locking bolt, move the device to the next section, and repeat the alignment, measurement, and recording steps until all preset sections are measured.

[0124] 5. Post-processing: After measurement, loosen the support fixture, remove the blade, clean all parts of the measuring device, wipe the probe clean, turn off the power of the electronic angle ruler, and store the device properly in a special toolbox; organize the measurement data, compare it with the design tolerance, and issue an inspection report. Qualified products flow into the next process, and unqualified products are marked with the problem location and fed back to the straightening process.

[0125] (III) Precautions for use

[0126] 1. Avoid collisions and shaking of the device during measurement, ensure point contact between the probe and the blade surface, and do not apply excessive pressure to prevent probe deformation;

[0127] 2. The ambient temperature should be controlled between 15℃ and 25℃. Avoid using it in environments with high temperature, high humidity, or a lot of dust to prevent affecting the performance of electronic components and measurement accuracy.

[0128] 3. Electronic angle gauges and height gauges need to be sent to the metrology department for calibration regularly. If the measuring probe is worn or deformed, it needs to be replaced in time to ensure that the device is always in qualified condition.

[0129] 4. For blades with complex curved surfaces or sharp leading and trailing edges, a special arc-shaped probe can be used to avoid measurement errors caused by contact point misalignment.

[0130] IV. Working Principle

[0131] The core of the measuring device and method in this embodiment is based on the principle of "parallel reference + two-point positioning + direct angle measurement" to achieve accurate detection of blade torsion angle. The specific working logic is as follows:

[0132] 1. Principle of Unified Reference Standard: The height gauge seat groove of the measuring device is parallel to the overall sliding direction of the platform sliding device and the platform plane; after the blade is aligned, the normal of the torsion angle of each tangential surface is parallel to the platform plane. That is, the motion reference, measurement reference and the geometric reference of the blade are unified, laying the foundation for accurate measurement.

[0133] 2. Two-point positioning principle: Measurement probe 5 (No. 1) and measurement probe 3 (No. 2) are positioned by the clamping frame slider. The distance between them can be adjusted according to the width of the front and rear edges of the blade cut. During measurement, the conical heads of the two probes form stable point contact with the front and rear edges of the cut, respectively. The line connecting the two points accurately reflects the chord direction of the cut, avoiding the directional deviation caused by unstable contact in traditional measurement.

[0134] 3. Angle Measurement Principle: The main measuring scale of the electronic angle gauge is fixed vertically to the height gauge. The line connecting the measuring probes is parallel to the main measuring scale. When the probe contacts the blade's tangent surface, the chord line of the tangent surface coincides with the line connecting the probes. The angle measured by the electronic angle gauge is the angle between the chord line of the tangent surface and the reference plane (platform plane). Combining the definition of blade torsion angle (the angle between the chord line of the tangent surface and the reference plane), the actual torsion angle value can be directly obtained through simple conversion without complex geometric calculations.

[0135] 4. Accuracy Guarantee Principle: The electronic angle gauge uses a high-precision sensor to collect angle signals, and the digital display avoids errors caused by manual reading; the micron-level height adjustment of the height gauge ensures accurate alignment of the probe height; the locking mechanism of the clamping frame slider and the fixing structure of the probe prevent positional shift during measurement. The multiple structural designs work together to ensure the accuracy and repeatability of the measurement results.

Claims

1. A measuring device for the torsion angle of a propeller blade forging, characterized in that, The measuring device includes a height adjustment assembly, an angle measurement assembly, a probe positioning assembly, and a locking and fixing assembly; the height adjustment assembly includes a height gauge (1), a height gauge seat groove (16), a height gauge vernier gauge seat (14), a height gauge lifting knob (15), and a height gauge vernier gauge fastening bolt (13); the angle measurement assembly includes an electronic angle gauge (2), an angle gauge measuring main body (7), an angle gauge rotating shaft (12), and an angle gauge fastening nut (17); the probe positioning assembly includes a No. 1 clamping frame slider (8), a No. 2 clamping frame slider (10), a No. 1 measuring probe (5), and a No. 2 measuring probe (3); the locking and fixing assembly includes a No. 1 fastening nut (6), a No. 2 fastening nut (4), a No. 1 knurled locking bolt (9), and a No. 2 knurled locking bolt (11); The height gauge (1) is fitted with a height gauge seat groove (16) and a height gauge vernier scale seat (14) along the axial direction. The height gauge lifting knob (15) controls the height gauge vernier scale seat (14) to rise and fall along the axial direction, and the height gauge vernier scale seat (14) is locked to the height gauge (1) by the height gauge vernier fastening bolt (13). The height gauge seat groove (16) is connected to the height gauge vernier scale seat (14) and rises and falls synchronously with the height gauge vernier scale seat (14) along the axial direction of the height gauge (1). The electronic angle ruler (2) is fixed to the height ruler seat groove (16) by bolts. The main body (7) of the angle ruler measuring scale is rotatably connected to the electronic angle ruler (2) through the angle ruler rotating shaft (12). It is locked by the angle ruler fastening nut (17) and kept at a certain angle with the electronic angle ruler (2). The No. 1 clamping slider (8) and the No. 2 clamping slider (10) are both fitted onto the main body (7) of the angle ruler measuring scale, and are fastened to the main body (7) of the angle ruler measuring scale by the No. 1 knurled locking bolt (9) and the No. 2 knurled locking bolt (11) respectively; the bottom surface of the No. 1 clamping slider (8) and the No. 2 clamping slider (10) are both provided with round holes; the heads of the No. 1 measuring probe (5) and the No. 2 measuring probe (3) are both conical, and the tails are both provided with external threads; the tail of the No. 1 measuring probe (5) is set in the round hole on the bottom surface of the No. 1 clamping slider (8), and the No. 1 measuring probe (5) is fastened to the No. 1 clamping slider (8) by the No. 1 fastening nut (6); the tail of the No. 2 measuring probe (3) is set in the round hole on the bottom surface of the No. 2 clamping slider (10), and the No. 2 measuring probe (3) is fastened to the No. 2 clamping slider (10) by the No. 2 fastening nut (4).

2. The measuring device for the torsion angle of a propeller forging according to claim 1, characterized in that, The height range of the height gauge (1) is 80~1000 mm.

3. The measuring device for the torsion angle of a blade forging according to claim 1, characterized in that, The measuring range of the main measuring scale (7) of the angle ruler is 0~360°.

4. The measuring device for the torsion angle of a blade forging according to claim 1, characterized in that, The electronic angle ruler (2) is equipped with a digital display screen, with a measurement accuracy of 0.1° and an error controlled within ±0.3°.

5. The measuring device for the torsion angle of a propeller forging according to claim 1, characterized in that, The adjustment accuracy of the height gauge lifting knob (15) is 0.05 mm.

6. The measuring device for the torsion angle of a propeller forging according to claim 1, characterized in that, The sliding distance of the No. 1 clamping frame slider (8) and the No. 2 clamping frame slider (10) is 0~500 mm.

7. The measuring device for the torsion angle of a blade forging according to claim 1, characterized in that, The No. 1 measuring probe (5) and the No. 2 measuring probe (3) mentioned above are both Stainless steel round bars.

8. A method for measuring the torsion angle of a blade forging using the measuring device as described in any one of claims 1-7, characterized in that, The measurement method is performed according to the following steps: Step S1: Place the blade forging on the testing platform and adjust its position so that the conical heads of the two measuring probes are perpendicular to the surfaces of the leading and trailing edges of the measured section. Step S2: Move the measuring device so that the two measuring probes contact the front and rear edges of the cut surface to be measured respectively, and read the angle value displayed on the digital display screen of the electronic angle ruler (2); Step S3: The torsion angle is calculated based on the read angle value. When the angle value is acute, the angle value is the torsion angle; if the angle value is obtuse, the angle value is subtracted from 360°, and the difference is the torsion angle. Step S4: Following steps S2 and S3, measure the angle values ​​of other cut surfaces and calculate the torsion angle; Step S5: Record the torsion angle values ​​of all cross-sections and compare them with the design drawings to determine whether the blade forging is qualified.

9. The method for measuring the torsion angle of a blade forging using a measuring device according to claim 8, characterized in that, The dimensions of the testing platform are 1.2 m × 1.5 m.

10. The method for measuring the torsion angle of a blade forging using a measuring device according to claim 8, characterized in that, When measuring the angle of a cross-section, if the digital display shows an angle of 0° or 180°, then the twist angle of the cross-section is 0°.

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