A method for automatically calculating and adjusting the wall thickness of hollow blades

Abstract

A method for automatically calculating and adjusting the wall thickness of a hollow blade comprises the following steps: step 1, measuring the wall thickness values ​​of two cavities before adjustment, and writing the wall thickness measurement potential number n; step 2, obtaining the wall thickness value before adjustment measured in step 1; step 3, calculating the part clamping offset value ε according to the wall thickness value before adjustment; step 4, calculating the coordinate system offset value Δ according to the wall thickness value before adjustment; step 5, calculating the adjusted wall thickness value T'; step 6, outputting the coordinate system offset value and the clamping offset value to guide the operator to further adjust the coordinate system offset and the clamping offset; step 7, processing the blade according to the adjusted offset value, comparing the wall thickness value of the processed blade with the adjusted wall thickness value T', verifying whether the wall thickness value of the processed blade meets the expectation, and repeating steps 1 to 6 for iterative correction if it deviates from the expectation. The method of the present invention can quickly and accurately calculate the offset value, provide precise guidance for the blade processing process, and significantly improve the processing efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of processing hollow blade components of aircraft engines, and in particular relates to a method for automatically calculating and adjusting the wall thickness of a hollow blade. Background Art

[0002] Due to the need to reduce the weight of the engine, the design drawings of the adjustable blades and support blades were changed to a hollow cavity structure. After the single-piece inner cavity was processed, it was connected and formed by diffusion welding. When machining the outer contour of the assembly, it is necessary to perform multiple wall thickness measurements. After each measurement, the operator needs to manually calculate the offset value of the coordinate system and the part clamping offset value based on the wall thickness measurement data. At this time, the processing machine tool needs to stop and wait. The outer contour machining process of a single hollow blade requires up to 6 adjustments, which takes 1 to 2 hours of production time. The manual calculation process is usually based on experience, and the calculation results of different personnel vary greatly. It is impossible to accurately calculate the part shape and obtain accurate adjustment values, which easily causes part deviations. Summary of the invention

[0003] The purpose of the present invention is to provide a method for automatically calculating and adjusting the wall thickness of a hollow blade. According to this method, the efficiency and accuracy of the wall thickness calculation and adjustment process can be improved, which is of great significance to improving the processing quality and efficiency of hollow blade components.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A method for automatically calculating and adjusting the wall thickness of a hollow blade comprises the following steps:

[0006] Step 1: After the assembly is processed into an outer contour, the wall thickness values ​​of the two cavities before adjustment are measured by an ultrasonic wall thickness measuring instrument, and the wall thickness measurement potential number n is written;

[0007] Step 2, obtaining the wall thickness value before adjustment measured in step 1;

[0008] Step 3, calculating the part clamping offset value ε according to the wall thickness value before adjustment;

[0009] Step 4, calculating the coordinate system offset value Δ according to the wall thickness value before adjustment;

[0010] Step 5, calculating the adjusted wall thickness value T′ according to the known wall thickness measurement potential number n, the clamping offset value ε, the coordinate system offset value Δ and the wall thickness value T before adjustment;

[0011]

[0012] Where: T-the wall thickness value before adjustment, T′-the wall thickness value after adjustment, Δ-the coordinate system offset value, ε-the clamping offset value, n-the serial number of the wall thickness measurement point;

[0013] Step 6, output the coordinate system offset value and the clamping offset value to guide the operator to further adjust the coordinate system offset and the clamping offset;

[0014] Step 7, process the blade according to the adjusted coordinate system offset value and clamping offset value, and measure the wall thickness of the processed blade again by an ultrasonic measuring instrument, and compare it with the adjusted wall thickness value T′ calculated in step 5 to verify whether the wall thickness of the processed blade meets the expectations. If it deviates from the expectations, repeat steps 1 to 6 for iterative correction.

[0015] Step 3, calculate the part clamping offset value ε according to the wall thickness value before adjustment, specifically:

[0016] The position tolerance value of the blade is enlarged by 150%, the maximum range of the part clamping offset value adjustment is determined, and the step length is determined according to the minimum unit of machine tool adjustment. The enumeration method is used to calculate the difference τ between the maximum wall thickness and the minimum wall thickness for the distribution range of the wall thickness value data before adjustment in each case:

[0017] τ=max(T 1 , T 2 , T 3 , T 4 , T 5 )-min(T 1 , T 2 , T 3 , T 4 , T 5 )

[0018] Compare the difference between the maximum and minimum wall thickness in each region under each given part clamping offset value. When the difference is the smallest, determine that the given part clamping offset value in the region is the optimal part clamping offset value ε.

[0019] Step 4: Calculate the coordinate system offset value Δ based on the wall thickness value before adjustment, specifically:

[0020] After calculating the optimal part clamping offset value ε, the wall thickness data before adjustment is brought in, the position tolerance value of the blade is enlarged by 150%, the maximum range of the part clamping offset value adjustment is determined, and the step length is determined according to the minimum unit of machine tool adjustment. The enumeration method is applied to compare the sum of the wall thickness of the blade basin and the blade back in each case. When the sum of the wall thickness of the blade basin and the blade back is equal, the given coordinate system offset value is determined to be the optimal coordinate system offset value Δ;

[0021] ∑T cc =∑T cv

[0022] Among them: Tcc is the leaf pot, Tcv is the leaf back.

[0023] The technical effects of the present invention are:

[0024] The method of the present invention can calculate the offset value quickly and accurately during actual use in the production site, provide precise guidance for the blade processing process, save production time occupied by manual calculation, and because of the high calculation accuracy, the number of adjustments can be reduced from 6 to 3, which can significantly improve the processing efficiency and avoid the out-of-tolerance scrapping of parts due to errors caused by manual calculation. As the number and types of blades increase, this method will be widely used.

[0025] The present invention saves processing cost calculation: each part saves processing time: 2 hours; processing cost per hour: about 40 yuan; single part saves processing cost: 2×40=80 yuan. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the wall thickness of the hollow blade of the present invention;

[0027] Figure 2 Schematic diagram of the measurement points of the wall thickness of the hollow blade of the present invention;

[0028] Figure 3 Schematic diagram of the correction value of the wall thickness of the hollow blade of the present invention;

[0029] Figure 4 Schematic diagram of the software interface for automatically calculating and adjusting the wall thickness of hollow blades of the present invention; DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] like Figure 4 As shown, a method for automatically calculating and adjusting the wall thickness of a hollow blade comprises the following steps:

[0032] Step 1: After the assembly is processed, the ultrasonic wall thickness measuring instrument is used to measure the wall thickness of two cavities (i.e., the middle large cavity and the exhaust small cavity), the blade basin, and the back of the blade. A total of 20 points are measured, and the wall thickness measurement potential sequence number n is written. The schematic diagram of the wall thickness measurement points is as follows: Figure 1 and Figure 2 As shown;

[0033] Step 2, obtaining the wall thickness value before adjustment measured in step 1;

[0034] Step 3: Calculate the part clamping offset value ε based on the wall thickness value before adjustment

[0035] The position tolerance value of the blade is enlarged by 150%, the maximum range of the part clamping offset value adjustment is determined, and the step length is determined according to the minimum unit of machine tool adjustment. The enumeration method is used to calculate the difference τ between the maximum wall thickness and the minimum wall thickness for the distribution range of the wall thickness value data before adjustment in each case:

[0036] τ=max(T 1 , T 2 , T 3 , T 4 , T 5 )-min(T 1 , T 2 , T 3 , T 4 , T 5 )

[0037] Compare the difference between the maximum and minimum wall thickness in each region under each given part clamping offset value. When the difference is the smallest, determine the given part clamping offset value of the region as the optimal part clamping offset value ε;

[0038] Step 4, calculating the coordinate system offset value Δ according to the wall thickness value before adjustment;

[0039] After calculating the optimal part clamping offset value ε, the wall thickness data before adjustment is brought in, the position tolerance value of the blade is enlarged by 150%, the maximum range of the part clamping offset value adjustment is determined, and the step length is determined according to the minimum unit of machine tool adjustment. The enumeration method is applied to compare the sum of the wall thickness of the blade basin and the blade back in each case. When the sum of the wall thickness of the blade basin and the blade back is equal, the given coordinate system offset value is determined to be the optimal coordinate system offset value Δ;

[0040] ∑T cc =∑T cv

[0041] Among them, Tcc is the leaf basin, and Tcv is the leaf back;

[0042] Step 5, calculating the adjusted wall thickness value T′ according to the known wall thickness measurement potential number n, the clamping offset value ε, the coordinate system offset value Δ and the wall thickness value T before adjustment;

[0043] When adjusting the clamping offset value and the coordinate system offset value, the overall state of the blade after processing will change as a whole. However, due to the difference in distance from the clamping position, the change in the offset value will have different effects on the wall thickness correction value of each point. The schematic diagram of the wall thickness calculation of each point after adjustment is as follows: Figure 3 As shown, the calculation formula is as follows:

[0044]

[0045] Where: T-the wall thickness value before adjustment, T′-the wall thickness value after adjustment, Δ-the coordinate system offset value, ε-the clamping offset value, n-the serial number of the wall thickness measurement point;

[0046] Step 6, output the coordinate system offset value and the clamping offset value to guide the operator to further adjust the coordinate system offset and the clamping offset;

[0047] Step 7, process the blade according to the adjusted coordinate system offset value and clamping offset value, and measure the wall thickness of the processed blade again by an ultrasonic measuring instrument, and compare it with the adjusted wall thickness value T′ calculated in step 5 to verify whether the wall thickness of the processed blade meets the expectations. If it deviates from the expectations, repeat steps 1 to 6 for iterative correction.

Claims

1. A method for automatically calculating and adjusting the wall thickness of a hollow blade, characterized in that: The following steps are involved: Step 1: After the assembly is machined to its contour, measure the wall thickness values ​​of the two cavities before adjustment, and write the wall thickness measurement potential number n; Step 2, obtaining the wall thickness value before adjustment measured in step 1; Step 3, calculating the part clamping offset value ε according to the wall thickness value before adjustment; Step 4, calculating the coordinate system offset value Δ according to the wall thickness value before adjustment; Step 5, calculating the adjusted wall thickness value T' according to the known wall thickness measurement potential number n, the clamping offset value ε, the coordinate system offset value Δ and the wall thickness value T before adjustment; Where: T-the wall thickness value before adjustment, T'-the wall thickness value after adjustment, Δ-the coordinate system offset value, ε-the clamping offset value, n-the serial number of the wall thickness measurement point; Step 6, output the coordinate system offset value and the clamping offset value to guide the operator to further adjust the coordinate system offset and the clamping offset; Step 7, process the blade according to the adjusted coordinate system offset value and clamping offset value, and measure the wall thickness of the processed blade again by an ultrasonic measuring instrument, and compare it with the adjusted wall thickness value T' calculated in step 5 to verify whether the wall thickness of the processed blade meets the expectations. If it deviates from the expectations, repeat steps 1 to 6 for iterative correction.

2. The method for automatically calculating and adjusting the wall thickness of a hollow blade according to claim 1, characterized in that: Step 3, calculate the part clamping offset value ε according to the wall thickness value before adjustment, specifically: The position tolerance value of the blade is enlarged by 150%, the maximum range of the part clamping offset value adjustment is determined, and the step length is determined according to the minimum unit of machine tool adjustment. The enumeration method is used to calculate the difference τ between the maximum wall thickness and the minimum wall thickness for the distribution range of the wall thickness value data before adjustment in each case: τ=max(T1,T2,T3,T4,T5)-min(T1,T2,T3,T4,T5) Compare the difference between the maximum and minimum wall thickness in each region under each given part clamping offset value. When the difference is the smallest, determine that the given part clamping offset value in the region is the optimal part clamping offset value ε.

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