A segmented forming method for increasing the length of a tube formed by a three-dimensional free-bending apparatus

Abstract

The application discloses a sectional forming method for improving the length of a three-dimensional free bending equipment forming pipe, relates to the field of advanced manufacturing technology of metal complex components, and can form a characteristic component exceeding the length limit by dividing the pipe into two sections for forming. The specific method is as follows: a characteristic component is divided into two parts B and C by taking a straight section in the middle of the characteristic component as a demarcation point, and two programs are obtained by separately analyzing the two parts. During forming, the first program is loaded to form the B section of the characteristic component, the pipe is pulled out after the first section is formed, the unformed section is inserted into the equipment, the second program is loaded to continue forming the C section, and finally the complete characteristic component is obtained. The method can improve the length of the formable pipe to some extent, and can be used for processing and forming a longer pipe.

Description

Technical Field

[0001] This invention relates to the field of advanced manufacturing technology for complex metal components, specifically a segmented forming method for increasing the length of tubular materials formed by three-dimensional free bending equipment. Background Technology

[0002] Currently, hollow tubular components with complex spatial configurations are playing an increasingly important role in both military and civilian fields such as aerospace, nuclear energy engineering, and automobiles. A major advantage of three-dimensional free bending forming technology compared to traditional processes is its ability to achieve integrated bending forming of tubular profiles with complex spatial shapes. However, due to the inherent length limitations of three-dimensional free bending equipment, the length of the formable tubing is affected, necessitating a forming method to increase the forming length of the tubing. Summary of the Invention

[0003] The purpose of this invention is to provide a segmented forming method for increasing the length of tubing formed by three-dimensional free bending equipment, so as to solve the problems in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A segmented forming method for increasing the length of tubing formed by three-dimensional free bending equipment includes the following steps:

[0006] Step 1: Divide the component into two parts, B and C, using the straight line segment in the middle of the feature component as the dividing line, and analyze them separately to obtain two mold motion trajectory programs;

[0007] Step 2: During forming, first load the first program to form feature component B segment;

[0008] Step 3: After the first segment is formed, pull out the tube, insert the unformed segment into the equipment, load the second program to continue forming segment C, and finally obtain the complete feature component.

[0009] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0010] In one alternative: the spatial axis of the formed special component needs to have a straight segment L to meet the requirements of segmented forming.

[0011] In one alternative approach: the three-dimensional geometric model of the feature component to be formed is divided into segments, the arc lengths of segments B and C cannot exceed the forming length limit of the forming equipment, and the length of the straight line segment L is greater than the value of A.

[0012] A: The horizontal distance between the center of the bending die ball and the front end of the guide mechanism in the Z-axis direction.

[0013] In one alternative: after the C-section pipe is inserted, the pipe is rotated to ensure that the first forming arc of the B-section is horizontal, thus ensuring that the component's forming shape is correct.

[0014] In one alternative approach: a method for modifying the C-segment mold motion trajectory program needs to be established;

[0015] The first formed segment is represented in the analytical program as Ux = a1, Uy = b1, and the subsequent formed segments are Ux = a2, Uy = b2, Ux = a3, Uy = b3, and so on. The angle between the spatial axes of segments B and C is φ. The quantitative relationship between the modified a1′ and b1′ and the original a1 and b1 is shown below:

[0016]

[0017]

[0018] Original program bending die initial deflection angle

[0019] The difference in the initial deflection angle of the bending mold before and after the program modification

[0020] The deflection angles of the bending die in the subsequent forming section of the original program are as follows: ...

[0021] After the program is modified, the deflection angles of the bending die in the subsequent forming section are as follows:

[0022]

[0023]

[0024] ...

[0025]

[0026] Modified a′ n b n The quantitative relationship between ′ and the original an and bn is shown below:

[0027]

[0028]

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] This invention addresses the limitations of equipment length by proposing a segmented forming method to increase the length of tubing formed by three-dimensional free bending equipment. By dividing the entire component into two parts, B and C, through a straight segment in the middle, the original one-time integral forming is optimized into segmented forming, which to a certain extent increases the length of formable tubing and enables the processing and forming of longer pipes. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the three-dimensional free bending device for pipes according to the present invention.

[0032] Figure 2 This is a schematic diagram illustrating the segmentation of the axis of the feature component in this invention.

[0033] Figure 3 This is a schematic diagram of the forming process of segment B, a feature component in this invention.

[0034] Figure 4 This is a schematic diagram of the forming process of segment C, a feature component in this invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Example 1

[0037] The angle between the two spatial axes, B and C, is φ = 90°.

[0038] The first step is to establish a three-dimensional digital model of the feature components, extract the central axis, and divide it into two segments, B and C, with the central straight line segment as the dividing line;

[0039] The second step involves extracting and analyzing segments B and C separately, resulting in two different procedures. When extracting points, the two endpoints of the straight line segment at the center position are used as the starting points, and the two endpoints of the feature components are used as the ending points, proceeding sequentially.

[0040] The third step involves modifying the two resulting programs after parsing. For example, the first formed segment in the parsing program is represented as Ux = a1, Uy = b1, and subsequent formed segments are Ux = a2, Uy = b2, Ux = a3, Uy = b3, and so on. The quantitative relationship between the modified a1′ and b1′ and the original a1 and b1 is shown below:

[0041]

[0042]

[0043] Modified a′ n b n The quantitative relationship between ′(n≥2) and the original an and bn is shown below:

[0044]

[0045]

[0046] The fourth step is to import the program into the database, debug the free bending forming equipment, insert the pipe, and prepare. Select the program corresponding to segment B and start forming. After the first segment is formed, pull out the pipe, keep segment B horizontal, then insert the unformed segment into the equipment, load the second program to continue forming segment C, and finally obtain the complete feature component.

[0047] Example 2

[0048] The included angle axis between segments B and C is 45°.

[0049] The first step is to establish a three-dimensional digital model of the feature components, extract the central axis, and divide it into two segments, B and C, with the central straight line segment as the dividing line;

[0050] The second step involves extracting and analyzing segments B and C separately, resulting in two different procedures. When extracting points, the two endpoints of the straight line segment at the center position are used as the starting points, and the two endpoints of the feature components are used as the ending points, proceeding sequentially.

[0051] The third step involves modifying the two resulting programs after parsing. For example, the first formed segment in the parsing program is represented as Ux = a1, Uy = b1, and subsequent formed segments are Ux = a2, Uy = b2, Ux = a3, Uy = b3, and so on. The quantitative relationship between the modified a1′ and b1′ and the original a1 and b1 is shown below:

[0052]

[0053]

[0054] Modified a′ n b n The quantitative relationship between ′(n≥2) and the original an and bn is shown below:

[0055]

[0056]

[0057] The fourth step is to import the program into the database, debug the free bending forming equipment, insert the pipe, and prepare. Select the program corresponding to segment B and start forming. After the first segment is formed, pull out the pipe, keep segment B horizontal, then insert the unformed segment into the equipment, load the second program to continue forming segment C, and finally obtain the complete feature component.

[0058] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A segmented forming method for increasing the length of tubing formed by a three-dimensional free bending equipment, characterized in that, Includes the following steps: Step 1: Divide the component into two parts, B and C, using the straight line segment in the middle of the feature component as the dividing line, and analyze them separately to obtain two mold motion trajectory programs; Step 2: During forming, first load the first program to form feature component B segment; Step 3: After the first segment is formed, pull out the tube, insert the unformed segment into the equipment, load the second program to continue forming segment C, and finally obtain the complete feature component; After inserting section C of the pipe, rotate the pipe to ensure that the first forming arc of section B is horizontal and to ensure that the shape of the component is correct. A method for modifying the motion trajectory program of segment C mold needs to be established; The first formed segment is represented as Ux= in the parsing program. Uy= The subsequent forming segments are Ux= Uy= Ux= Uy= ..., the angle between the two spatial axes B and C is... ; Modified , With the original , The quantitative relationship between them is shown below: The initial deflection angle of the bending mold in the original program The difference in the initial deflection angle of the bending mold before and after the program modification The deflection angles of the bending die in the subsequent forming section of the original program are as follows: ..., then after the program is modified, the deflection angles of the bending die in the subsequent forming section are as follows: ... The revised version , With the original , The quantitative relationship between them is shown below: ； 。 2. The segmented forming method for increasing the length of tubing formed by three-dimensional free bending equipment according to claim 1, characterized in that, The spatial axis of the special component to be formed must have a straight segment L to meet the requirements of segmented forming.

3. The segmented forming method for increasing the length of tubing formed by three-dimensional free bending equipment according to claim 1, characterized in that, The three-dimensional geometric model of the feature component to be formed is divided into segments. The arc lengths of segments B and C cannot exceed the forming length limit of the forming equipment, and the length of the straight line segment L is greater than the value of A. A: The horizontal distance between the center of the bending die ball and the front end of the guide mechanism in the Z-axis direction.

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