Conduit roll-in compensation method

Abstract

This invention discloses a method for compensating the inner diameter of a conduit during rolling. The method involves obtaining the conduit to be rolled, determining the theoretical wall thickness, theoretical inner diameter of the connector, and theoretical outer diameter of the conduit after rolling, and calculating the theoretical inner diameter value after rolling. Based on the theoretical wall thickness and the conduit material, the method retrieves the required wall thickness corresponding to the material of the conduit and the wall thickness change value C under a predetermined rolling torque during rolling flow. The method then measures the following parameters of the actual conduit to be rolled: actual wall thickness, actual outer diameter, and actual inner diameter of the sleeve. Finally, the actual inner diameter value after rolling is calculated. This method improves the actual inner diameter value D of the conduit after rolling. s The accuracy of the rollers is improved, and the rolling torque can be further refined to ensure the dimensional accuracy of the rollers, ensuring good sealing performance during operation and ultimately improving the safe operation of the aircraft.

Description

Technical Field

[0001] This invention relates to the field of catheter rolling technology, and in particular to a method for compensating for the inner diameter of a catheter during rolling. Background Technology

[0002] Aviation hydraulic non-flared conduits are detachable conduits where the conduit and sleeve are connected by rolling, and then the sleeve is connected to a connector with a 24° tapered surface to ensure a tight seal. Compared to traditional flared connections, they offer superior performance in various aircraft operating environments.

[0003] Aviation hydraulic non-flaring conduits refer to conduits and sleeves that are plastically deformed by the torque provided by a rolling device, forcing the conduit into the sleeve groove to achieve a permanent connection. During the conduit assembly rolling process, to ensure that the rolling process meets design and usage requirements, it is necessary to check whether the inner diameter of the conduit after rolling meets the requirements.

[0004] During the actual rolling and inspection process, although the inner diameter value after rolling can meet the design value (fixed value) requirements, the delivered conduit assembly often has leakage problems during use because the influence of the actual purchased conduit wall thickness, conduit outer diameter tolerance and other variation factors is not taken into account, which poses a great safety hazard to the aircraft hydraulic system.

[0005] The technical problem that this invention aims to solve is: how to increase the inner diameter of the conduit after rolling, thereby improving the safety performance of the aircraft hydraulic system, while taking into account the influence of variations in the actual purchased conduit wall thickness and conduit outer diameter tolerance. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention provides a compensation formula for factors such as changes in catheter wall thickness and outer diameter tolerance. The actual inner diameter D of the catheter after rolling is obtained by correcting for the effects of changes in catheter wall thickness, outer diameter, and the rolling torque reference value. s The actual inner diameter value D s After calculation, the torque value of the rolling process is further adjusted during the rolling of the conduit, so that no matter how the wall thickness and outer diameter of the conduit change, the optimal rolling torque value can be calculated to roll the conduit, thereby solving the problem of inaccurate rolling torque, making the conduit rolling fully meet the design and use requirements, and greatly improving the qualification rate of the rolled conduit products. This is a conduit rolling inner diameter compensation method.

[0007] The technical solution adopted in this invention is:

[0008] Method for compensating the inner diameter of the conduit by rolling.

[0009] Obtain the conduit to be rolled, and determine the theoretical wall thickness δ0 and theoretical inner diameter D of the connector required after rolling.jo Theoretical outer diameter D of the catheter to And the theoretical inner diameter D after the guide tube is rolled is calculated. so ;

[0010] Based on the theoretical wall thickness δ0 of the conduit obtained in the previous step and the conduit material, retrieve the required conduit wall thickness corresponding to the material conduit, and the conduit wall thickness roll flow change value C under the predetermined rolling torque;

[0011] The following parameters of the actual conduit to be rolled should be measured: actual wall thickness δ, actual outer diameter D. t Actual inner diameter D of the sleeve j ;

[0012] The actual inner diameter D of the guide tube after rolling was calculated. s :

[0013] D s = D so + 2(δ0-δ)+(D j - D j0 )+(D t -D to )- C.

[0014] Furthermore, the change in duct wall thickness C under the predetermined rolling torque is obtained according to the following steps:

[0015] S1, Obtain a material for the conduit; for conduits of the same thickness, measure the conduit thickness δ. 前 The same rolling torque is used to roll the conduit;

[0016] S2, after cutting and rolling the conduit, measure the conduit thickness δ. 后 Calculate the change in duct wall thickness due to rolling flow, C:

[0017] C=δ 后 -δ 前 ;

[0018] S3 records the material properties, thickness, and rolling torque of the conduit, as well as the change in conduit wall thickness during rolling flow at that thickness, C.

[0019] The step of determining the change in duct wall thickness C under a predetermined rolling torque during rolling flow also includes:

[0020] S4. Repeat the above steps at least once to obtain the duct wall thickness roll flow variation value C with the same material properties, thickness and roll torque.

[0021] S5, calculate the mean series of values ​​for the change in duct wall thickness during rolling flow, C.

[0022] Further, repeat steps S1-S5 above to obtain the change value C of the conduit wall thickness under different rolling torques for different materials and different thicknesses, so as to form a standard value of the change value C of the conduit wall thickness under different wall thicknesses and different rolling torques for each material.

[0023] Furthermore, the theoretical inner diameter D after tube rolling so The calculation formula is:

[0024] D so =D j0 +2m-2δ o

[0025] Where: m - depth of the groove in the inner wall of the conduit.

[0026] Furthermore, the actual wall thickness δ of the catheter is measured three times or more.

[0027] Furthermore, the actual outer diameter D of the catheter t and the actual inner diameter D of the sleeve j During the measurement, the number of measurements is 2 to 5 times.

[0028] Furthermore, the actual wall thickness δ and the actual outer diameter D of the catheter are... t and the actual inner diameter D of the sleeve j Each of the several measurements was evenly distributed around the circumference of the conduit wall.

[0029] Furthermore, the actual inner diameter D of the sleeve after rolling j The measurement point is the center of the third groove at the groove furthest from the sleeve sealing surface.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] 1. Increased the actual inner diameter value D s Accuracy:

[0032] Based on the theoretical values ​​of the conduit to be rolled: theoretical wall thickness δ0 of the conduit, theoretical inner diameter D of the connector. jo Theoretical outer diameter D of the catheter to The theoretical inner diameter D of the guide tube after rolling is calculated using existing calculation methods. so Then, based on the theoretical wall thickness δ0 of the conduit obtained in the previous step and the conduit material, retrieve the required conduit wall thickness corresponding to the material conduit being manufactured, and the conduit wall thickness roll flow change value C under the predetermined rolling torque. At the same time, measure the actual wall thickness δ and the actual outer diameter D of the actual conduit to be rolled. t Actual inner diameter D of the sleeve jThe effects of catheter wall thickness variation, catheter outer diameter variation, and rolling torque reference value were fully considered and quantified, and the actual inner diameter value D of the catheter after rolling was obtained after correction. s This increases the actual inner diameter D of the guide tube after rolling. s The precision is ensured to guarantee the dimensional accuracy of the rolled conduit, ensuring good sealing performance during operation, and ultimately improving the safe operation of the aircraft.

[0033] 2. Improved the accuracy of rolling torque during guide tube rolling:

[0034] The actual inner diameter value D s After the calculation, substitute it into the rolling torque calculation formula to calculate the rolling torque value, which is to further calculate the corrected actual inner diameter value D. s The torque value used to adjust the rolling process during conduit rolling is used to calculate the optimal rolling torque value for the conduit regardless of changes in conduit wall thickness and outer diameter, thereby solving the problem of inaccurate rolling torque.

[0035] The conduit rolling inner diameter compensation method of the present invention adds correction for the rolling torque changes caused by the dependent variables of conduit wall thickness and outer diameter changes during the conduit rolling process, eliminates the torque uncertainty factor in the non-flaring rolling process, realizes precise rolling of hydraulic non-flaring connection technology, and thus improves the actual inner diameter value D of the conduit after rolling. s The accuracy of the rollers is improved, and the rolling torque can be further refined to ensure the dimensional accuracy of the rollers, ensuring good sealing performance during operation and ultimately improving the safe operation of the aircraft. Attached Figure Description

[0036] Figure 1 A flowchart of the method for compensating the inner diameter of a conduit by roller pressing;

[0037] Figure 2 Flowchart for calculating the change value C of the duct wall thickness under rolling flow;

[0038] Figure 3 This is a diagram showing the connection structure between the catheter and the sleeve;

[0039] Wherein: 1-conduit, 2-tube sleeve, 21-tube sleeve sealing surface, 22-third groove, 23-center position. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the combination or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, in the description of the embodiments of this invention, the positional relationships of devices such as "upper," "lower," "front," "rear," "left," and "right" in all figures are based on… Figure 1 As the standard.

[0042] like Figure 1 The flowchart shown is for the method of compensating for the inner diameter of the conduit by rolling.

[0043] As in step S10, the conduit to be rolled is obtained, and the theoretical wall thickness δ and theoretical inner diameter D of the connector are required after rolling. jo Theoretical outer diameter D of the catheter to And as calculated in step S20, the theoretical inner diameter D of the guide tube after rolling is obtained. so ;

[0044] As in step S40, measure the following parameters of the actual conduit to be rolled: actual conduit wall thickness δ; actual conduit outer diameter D. t ;

[0045] Actual inner diameter D of the sleeve j。

[0046] As in step S30, based on the theoretical wall thickness δ of the conduit obtained in the previous step and the conduit material, the required conduit wall thickness corresponding to the material conduit and the conduit wall thickness rolling flow change value C under the predetermined rolling torque are retrieved;

[0047] The following parameters of the actual conduit to be rolled are measured: actual wall thickness δ, actual outer diameter D. t Actual inner diameter D of the sleeve j ;

[0048] See step S50 for the calculation of the actual inner diameter D of the guide tube after rolling. s :

[0049] D s = D so + 2(δ0-δ)+(D j - D j0 )+(D t -D to )- C.

[0050] A better implementation method is to, during the calculation process of the above compensation method, such as Figure 2As shown, the change value C of the duct wall thickness under a predetermined rolling torque is obtained by the following steps:

[0051] S1, Obtain a material for the conduit; for conduits of the same thickness, measure the conduit thickness δ. 前 The same rolling torque is used to roll the conduit;

[0052] S2, after cutting and rolling the conduit, measure the conduit thickness δ. 后 Calculate the change in duct wall thickness due to rolling flow, C:

[0053] C=δ 后 -δ 前 ;

[0054] δ 前 - Thickness of the pre-rolled guide tube, δ 后 -Thickness of the conduit after cutting and rolling;

[0055] S3 records the material properties, thickness, and rolling torque of the conduit, as well as the change in conduit wall thickness during rolling flow at that thickness, C.

[0056] The step of determining the change in duct wall thickness C under a predetermined rolling torque during rolling flow also includes:

[0057] S4. Repeat the above steps at least once to obtain the duct wall thickness roll flow variation value C with the same material properties, thickness and roll torque.

[0058] S5, calculate the mean value of the change in duct wall thickness due to rolling flow, C;

[0059] The above steps can be performed individually or in batches before mass production of each type of conduit with different material and wall thickness, to obtain a stable standard value of the conduit wall thickness rolling flow change C for later use.

[0060] A better implementation is to repeat steps S1-S5 above to obtain the conduit wall thickness roll flow variation value C under different rolling torques for different materials and thicknesses. This forms a standard value for the conduit wall thickness roll flow variation value C under different wall thicknesses and different rolling torques for each material. This standard value can be directly queried when rolling conduits, which can better promote the conduit roll inner diameter compensation. For conduits that need to be rolled later, only the material, thickness, and rolling torque of the conduit need to be provided to find the standard value of the required conduit wall thickness roll flow variation value C. This eliminates the cycle and cost of conducting multiple tests for measurement before the conduit is rolled.

[0061] A preferred implementation method is to calculate the theoretical inner diameter Dso after the conduit is rolled using the following formula:

[0062] Dso =D j0 +2m-2δ o

[0063] Where: m - depth of the groove in the inner wall of the conduit.

[0064] The actual wall thickness δ of the catheter is measured three times or more. The average value of all measured data is then taken to determine the actual wall thickness δ. Finally, the actual inner diameter D of the catheter after rolling is calculated. s Used for calculations.

[0065] A preferred embodiment is that the actual outer diameter D of the catheter t and the actual inner diameter D of the sleeve j During measurement, 2-5 measurements are sufficient to obtain a good determination of the actual outer diameter D of the catheter. t Actual inner diameter D of the sleeve j The value is then used to determine the actual inner diameter D of the supply tube after rolling. s Used for calculations.

[0066] A preferred embodiment is that the actual wall thickness δ of the catheter and the actual outer diameter D of the catheter are... t and the actual inner diameter D of the sleeve j Several measurements are evenly distributed around the circumference of the conduit wall. The actual average value of the measurements is substituted into the compensation formula to obtain the actual inner diameter value after rolling. Finally, the actual inner diameter value after rolling must fall within the calculated value of the inner diameter range after rolling to be considered qualified; otherwise, it is considered unqualified.

[0067] In actual operation, before rolling, the wall thickness δ of the guide tube is measured four times, with four δ values ​​measured at 0°, 90°, 180°, and 270° positions on the guide tube wall; the actual inner diameter D of the tube sleeve is then measured. j Measure the actual outer diameter D of the catheter twice, at 0° and 180° positions, or at 90° and 270° positions, on the sleeve 2. t Twice, at the 0° and 180° positions of the guide tube, or at the 90° and 27° positions of the guide tube. Next, calculate the actual average value of the above measurements, and substitute the calculated actual average value into the compensation formula to obtain the actual inner diameter D after rolling. s Finally, roll the material and measure the actual inner diameter D after rolling. s It must fall within the calculated range of the inner diameter after rolling to be considered qualified; otherwise, it is considered unqualified.

[0068] A better implementation method is to use the actual inner diameter D of the sleeve after rolling. jThe measurement point is the center position 23 of the third groove 22 of the tube sleeve 2, which is away from the tube sleeve sealing surface 21. This ensures that the calculated actual inner diameter D of the guide tube after rolling is obtained. s More accurate. Example

[0069] The G8x0.6 catheter, G10x0.7 catheter, and G12x1 catheter were used as test objects and rolled. The compensation method described above was used for compensation, and the data in Tables 1, 2, 3, and 4 are shown below.

[0070] Table 1 lists the theoretical data, measurement data, and numerical values ​​obtained by compensation according to the supplementary method of the present invention for the above three catheter specifications.

[0071]

[0072] Table 2 shows the calculated actual inner diameter D of the G8x0.6 catheter after rolling, obtained by using the compensation formula of this invention. s Comparison with the actual inner diameter value Dsc obtained after actual roll forming.

[0073]

[0074] As shown in Table 2, the inner diameter D of the G8x0.6 catheter after roller compression is calculated using the above compensation formula. s The actual inner diameter D after rolling was then measured. sj When the filling rate C is greater than 85%, the actual inner diameter measurement after rolling must fall within D. sj Within the range of (0~0.12), it meets the usage requirements.

[0075] Table 3 shows the calculated actual inner diameter D of the G10x0.7 catheter after rolling, obtained by using the compensation formula of this invention. s Comparison with the actual inner diameter value Dsc obtained after actual roll forming.

[0076]

[0077] As shown in Table 3, the inner diameter D of the guide tube after compensation using the above compensation formula is calculated based on G10x0.7. s The actual inner diameter D after rolling was then measured. sj When the filling rate C is greater than 85%, the actual inner diameter measurement after rolling must fall within D. sj Within the range of (0-0.14), it meets the usage requirements.

[0078] Table 4 shows the actual inner diameter D of the G12x1 catheter after rolling, calculated using the compensation formula of this invention. s Comparison with the actual inner diameter value Dsc obtained after actual roll forming.

[0079]

[0080] As shown in Table 4 above, the inner diameter D of the G12x1 catheter after compensation using the above compensation formula is calculated after the catheter rolling. s The actual inner diameter D after rolling was then measured. sj When the filling rate C is greater than 85%, the actual inner diameter measurement after rolling must fall within D. sj Within the range of (0-0.14), it meets the usage requirements.

[0081] In summary, it can be seen that the conduit rolling inner diameter compensation method of the present invention improves the correction for rolling torque changes caused by variations in conduit wall thickness and outer diameter during the conduit rolling process. It eliminates torque uncertainties during non-flaring rolling, achieving precise rolling in hydraulic non-flaring connection technology, thereby improving the actual inner diameter value D of the conduit after rolling. s The accuracy of the rollers is improved, and the rolling torque can be further refined to ensure the dimensional accuracy of the rollers, ensuring good sealing performance during operation and ultimately improving the safe operation of the aircraft.

[0082] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of the present invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for compensating the inner diameter of a conduit by roller pressing, characterized in that: Obtain the conduit to be rolled, the theoretical wall thickness of the conduit, the theoretical inner diameter of the connector, and the theoretical outer diameter of the conduit required after rolling, and calculate the theoretical inner diameter value of the conduit after rolling. Based on the theoretical wall thickness and material of the conduit obtained in the previous step, retrieve the required wall thickness of the conduit corresponding to the material being manufactured, and the change value of the conduit wall thickness under the predetermined rolling torque during rolling flow. Measure the following parameters of the actual conduit to be rolled: actual wall thickness of the conduit, actual outer diameter of the conduit, and actual inner diameter of the sleeve. The actual inner diameter D of the guide after roller rolling is calculated using the following compensation formula. s : D s = D so + 2(δ0-δ)+(D j - D j0 )+(D t -D to )- C; Where: δ0 - theoretical catheter wall thickness, δ - actual catheter wall thickness, D jo - Theoretical inner diameter of the joint, D to - Theoretical outer diameter of the catheter, D t - Actual outer diameter of the catheter, D so - Theoretical inner diameter of the guide tube after rolling, C - Change in guide tube wall thickness due to rolling flow, D j - Actual inner diameter of the sleeve, D s - Actual inner diameter of the guide tube after rolling; The change in duct wall thickness under a predetermined rolling torque during rolling flow was obtained according to the following steps: S1. Obtain a conduit made of a certain material, and for conduits of the same thickness, measure the thickness of the conduit. ， Roll the conduit using the same rolling torque; S2. After cutting and rolling the conduit, measure the conduit thickness and calculate the change in conduit wall thickness due to flow during rolling: C=δ 后 -d 前 ; δ 前 - Thickness of the pre-rolled guide tube, δ 后 -Thickness of the conduit after cutting and rolling; S3. Record the material properties, thickness, and rolling torque of the conduit, as well as the change in conduit wall thickness during rolling flow at that thickness.

2. The method for compensating the inner diameter of a conduit by roller pressing according to claim 1, characterized in that: The step of determining the change in duct wall thickness C under a predetermined rolling torque during rolling flow also includes: S4. Repeat the above steps at least once to obtain the duct wall thickness roll flow variation value with the same material properties, thickness and roll torque. S5, calculate the mean value of the change in the duct wall thickness due to rolling flow.

3. The method for compensating the inner diameter of a conduit by roller pressing according to claim 2, characterized in that: Repeat steps S1-S5 above to obtain the changes in the wall thickness of the conduit under different rolling torques for different materials and thicknesses, so as to form a series of standard values ​​for the changes in the wall thickness of the conduit under different wall thicknesses and different rolling torques for each material.

4. The method for compensating the inner diameter of a conduit by roller pressing according to claim 1, characterized in that: The formula for calculating the theoretical inner diameter of the guide tube after rolling is as follows: D so =D j0 +2m-2δ o Where: m - depth of the groove in the inner wall of the catheter, D so - Theoretical inner diameter of the conduit after rolling.

5. The method for compensating the inner diameter of a conduit by roller pressing according to claim 2, characterized in that: The actual wall thickness of the catheter was measured three or more times, and then the average value of all the measured data was taken.

6. The method for compensating the inner diameter of a conduit by roller pressing according to claim 5, characterized in that: The actual outer diameter of the catheter and the actual inner diameter of the sleeve are measured 2 to 5 times.

7. The method for compensating the inner diameter of a conduit by roller pressing according to claim 6, characterized in that: The actual wall thickness of the catheter, the actual outer diameter of the catheter, and the actual inner diameter of the sleeve are each measured several times and evenly distributed around the circumference of the catheter wall.

8. The method for compensating the inner diameter of a conduit by roller pressing according to any one of claims 1-7, characterized in that: The actual inner diameter of the sleeve after rolling is measured at the center (23) of the third groove (22) of the sleeve (2) away from the sleeve sealing surface (21).

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