Method for quickly realizing unfolding length of bent pipe with flange

Abstract

A method for rapidly achieving the unfolding length of a bent pipe with a flange comprises the steps that a straight pipe is divided into a reserved flange interference prevention distance L1, a straight line section L2, a bent part L3, a straight line section L4 and a reserved flange interference prevention distance L5, repeated bending is conducted till the rebound angle measured after current bending rebound meets the precision requirement, and then the bent pipe with the flange is obtained. And the unfolding length of the bent section L3 and the unfolding length of the whole bent pipe corresponding to the bent section L3 are calculated according to the current rebound angle. According to the method, the unfolding lengths of pipes of different materials and different sizes can be rapidly and accurately calculated, the problem that the bent pipe with the flange cannot be installed due to the fact that the length error is too large during installation is solved, the bending forming quality and forming efficiency can be remarkably improved, the production cost is reduced, and the production efficiency is improved. The method has important engineering application value and obvious economic benefits in the engineering fields of ships, aerospace, automobiles and the like.

Description

Technical Field

[0001] The invention relates to a technology in the field of mechanical processing, in particular to a method for quickly realizing the expansion length of a flanged elbow. Background Art

[0002] The flanged pipe bending process of welding first and then bending has the advantages of achieving single-machine automation and full-line automation, achieving pipe making without excess, improving pipe utilization, processing accuracy and high product quality, and has a good application prospect. However, the length of the straight pipe part of the pipe blank of the welding first and then bending pipe is determined, and its bending forming springback is inevitable, which will lead to defects such as deformation of the flanges at both ends and low bending accuracy. Therefore, it is urgent to accurately and quickly determine the actual expansion length of the pipe. Traditional methods often rely on complex calculations and multiple iterations. Under the existing technical framework, due to the wide variety of pipe types and the complexity of the pipe bending process, the processing of pipe bending springback compensation often faces huge calculations, and the operation process is also cumbersome. The new fast iterative compensation method can handle the pipe bending springback compensation problem more efficiently, greatly reducing the amount of calculation and the number of iterations, and simplifying the operation process. This not only enables the expansion length of the pipe to be determined more quickly and accurately, but also significantly improves the accuracy and efficiency of pipe bending manufacturing, providing strong support for assembly work in the fields of ships and automobiles. Summary of the invention

[0003] In view of the shortcomings of the existing rebound angle reverse prediction and compensation technology, which has repeated iterations, long calculation time and difficulty in quickly obtaining compensation solutions, the present invention proposes a method for quickly realizing the unfolded length of a flanged elbow, which can realize the rebound compensation of the length of the bent part and ensure that the predetermined accuracy requirements are met after multiple rapid compensations. The present invention can realize the rapid and accurate calculation of the unfolded length of pipes of different materials and sizes, avoids the problem that the flanged elbow cannot be installed due to excessive length error during installation, can significantly improve the bending forming quality and forming efficiency, reduce production costs, and has important engineering application value and obvious economic benefits in engineering fields such as ships, aerospace, and automobiles.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention relates to a method for quickly realizing the expanded length of a flanged elbow. A straight pipe is divided into a reserved flange interference prevention distance L1, a straight section L2, a curved section L3, a straight section L4, and a reserved flange interference prevention distance L5. The straight section L3 is bent multiple times in a cycle until a measured rebound angle after the bending rebounds meets the accuracy requirement. The expanded length of the bent section L3 and its corresponding expanded length of the entire elbow are calculated according to the rebound angle.

[0006] The cyclic multiple bending specifically refers to: performing the first bending according to the target bending angle θ1, measuring the bending angle f(θ1) after rebound, calculating the first rebound angle Δ1=θ1-f(θ1), and performing an angle accuracy check to see if Δ1≤ε. If the accuracy requirement is not met, the second bending value is θ2=θ1+Δ1, measuring the bending angle f(θ2) after rebound, calculating the second rebound angle Δ2=θ1-f(θ2), and performing an accuracy check to see if Δ2≤ε; if the accuracy requirement is not met, performing the third bending; based on the data obtained from the first and second bending, the third bending angle is calculated through the rebound compensation mechanism to be The bending angle f(θ3) after springback is measured, and the third springback angle Δ3=θ1-f(θ3), and the angle accuracy is checked to see if Δ3≤ε; if the accuracy requirement is not met, the whole process is repeated until the kth bending value is The bending angle f(θ k+2 ), the springback angle of the kth bending Δ k+2 =θ1-f(θ k+2 ), and check the angle accuracy to see if Δ k+2 ≤ε, k=1, 2, 3…, repeat the above process until the accuracy requirement is met.

[0007] The springback angle calculation bending section

[0008] The unfolded length of the entire curved pipe is L=L1+L2+L3+L4+L5. Technical Effects

[0009] The present invention achieves precise optimization of springback compensation through an efficient and fast iterative compensation mechanism. This technological breakthrough effectively solves the complexity and uncertainty problems previously encountered in the calculation of the unfolded length of flanged elbows, and significantly improves the accuracy and efficiency of the calculation. Compared with the existing problem of dimensional errors caused by the springback of the bending section of the straight pipe with flanges after bending, which often results in the inability to accurately install the elbow with other parts, thus affecting the smooth progress of the overall assembly, the present invention can significantly improve the forming efficiency and forming quality of the elbow. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a flow chart of the present invention;

[0011] Figure 2 This is a segmented diagram of a flanged elbow pipe in an embodiment;

[0012] Figure 3 Schematic diagram of iterative compensation mechanism of the embodiment. DETAILED DESCRIPTION

[0013] like Figure 1 As shown, this embodiment relates to a method for quickly realizing the expansion length of a flanged elbow. Figure 2 The target bent pipe shown is made of Q235 steel, with characteristics such as pipe diameter of 114mm, wall thickness of 14mm, bending angle of 90°, bending radius of 300mm, etc. The bending angle accuracy requirement is ≤0.5°.

[0014] After specific experiments, the first bending angle is θ1=90°, the bending angle after springback is f(θ1)=87.4°, the springback angle is Δ1=θ1-f(θ1)=90°-87.4°=2.6°, the second bending angle is θ2=θ1+Δ1=92.6°, the bending angle after springback is f(θ2)=88.8°, and the springback angle Δ2=θ1-f(θ2)=90°-88.8°=1.2° is obtained. Then the third bending angle is calculated by the springback compensation mechanism as follows: The bending angle after springback is f(θ3)=89.7°, Δ1=θ1-f(θ3)=90°-89.7°=0.3°≤0.5°, which meets the bending angle accuracy requirement. The bending section length is calculated as The unfolded length is L=L1+L2+L3+L4+L5=100+300+469.43+200+100=1169.43mm.

[0015] Table 1 Experimental results of fast compensation mechanism

[0016] Table 21 / 2 Compensation mechanism experimental results

[0017] Compared with the prior art, the performance indicators of this method are improved in that: by optimizing the calculation process and algorithm of springback compensation, the present invention can efficiently handle the springback problem of flanged elbows after bending, reducing the cumbersome multiple compensation and verification steps in traditional methods. It can significantly reduce the number of compensations and calculation time, effectively reduce costs, and quickly and accurately determine the unfolded length of flanged elbows, thereby greatly improving the accuracy of installation.

[0018] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A method for quickly achieving the expansion length of a flanged elbow, characterized in that: The straight pipe is divided into a reserved flange interference prevention distance L1, a straight section L2, a curved section L3, a straight section L4, and a reserved flange interference prevention distance L5. The straight pipe is bent repeatedly until the rebound angle measured after the current bend meets the accuracy requirements. The expanded length of the bending section L3 and its corresponding expanded length of the entire bent pipe are calculated based on the current rebound angle.

2. The method for quickly expanding the length of a flanged elbow according to claim 1 is characterized in that: The cyclic multiple bending specifically refers to: performing the first bending according to the target bending angle θ1, measuring the bending angle f(θ1) after rebound, calculating the first rebound angle Δ1=θ1-f(θ1), and performing an angle accuracy check to see if Δ1≤ε. If the accuracy requirement is not met, the second bending value is θ2=θ1+Δ1, measuring the bending angle f(θ2) after rebound, calculating the second rebound angle Δ2=θ1-f(θ2), and performing an accuracy check to see if Δ2≤ε; if the accuracy requirement is not met, performing the third bending; based on the data obtained from the first and second bending, the third bending angle is calculated through the rebound compensation mechanism to be The bending angle f(θ3) after springback is measured, and the third springback angle Δ3=θ1-f(θ3), and the angle accuracy is checked to see if Δ3≤ε; if the accuracy requirement is not met, the whole process is repeated until the kth bending value is The bending angle f(θ k+2 ), the springback angle of the kth bending Δ k+2 =θ1-f(θ k+2 ), and check the angle accuracy to see if Δ k+2 ≤ε, k=1, 2, 3…, repeat the above process until the accuracy requirement is met.

3. The method for quickly expanding the length of a flanged elbow according to claim 2 is characterized in that: The springback angle calculation bending section

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