A process for the manufacture of twisted parts of fibre-reinforced composites

Abstract

This invention discloses a machining process for tortuous parts made of fiber-reinforced composite materials, comprising the following steps: tooling design, part clamping and positioning, rough machining of area AB, failure handling, finish machining of area AB, rough machining of area C, finish machining of area C, removal of end faces, and finished product inspection. This invention provides a machining process for tortuous parts made of fiber-reinforced composite materials. By designing specialized tooling according to the part's shape and introducing failure handling, it reduces the waste of plywood raw materials compared to traditional machining processes. It also solves the problems of stress deformation and datum misalignment during the machining of tortuous parts made of fiber-reinforced composite materials, possessing significant economic and social value.

Description

Technical Field

[0001] This invention relates to the field of fiber-reinforced composite material processing technology, and specifically to a processing technology for twisted parts made of fiber-reinforced composite materials. Background Technology

[0002] Fiber-reinforced composite materials possess a range of advantages, including high strength, light weight, shock absorption, fatigue resistance, chemical corrosion resistance, and insulation. They also exhibit excellent ballistic resistance and noise reduction properties, making them widely applicable in fields such as hand machinery, chemical engineering, and transportation. In the military field, they can be used for radomes, fairings, missile warheads, ablation heat shields for solid rocket launchers, missile launch tubes, and structural components for machinery and mountain combat vehicles. However, fiber-reinforced composite materials also present processing challenges, particularly the CNC machining of tortuous fiber-reinforced composite parts. Existing machining processes for tortuous fiber-reinforced composite parts differ fundamentally from those for straight sections or parts made of other materials. The initial part is formed by layering materials according to the part's shape and then thermoforming it, resulting in a slender and tortuous shape. This process introduces processing stress deformation and lacks a machining reference. Consequently, machining is prone to deviations from the machining reference and processing stress deformation. Ultimately, this leads to low machining efficiency and poor precision in existing methods for machining tortuous fiber-reinforced composite parts, and the possibility of severe deformation during machining, ultimately rendering some parts unusable.

[0003] Due to the difficulty in forming blanks for fiber-reinforced composite twisted parts, it is challenging to meet the requirements for high-quality and efficient milling. The inherent characteristics of the material blanks make them prone to stress deformation and deviations from machining datum during processing, resulting in low yield and low machining efficiency. Research has shown that new machining processes play a crucial role in the processing of fiber-reinforced composite twisted parts, as traditional processes struggle to meet the high-precision requirements. Therefore, there is an urgent need for new machining processes for fiber-reinforced composite twisted parts. This paper addresses the problems of low yield and poor precision in existing fiber-reinforced composite twisted parts machining. Summary of the Invention

[0004] This invention provides a processing technology for twisted parts made of fiber-reinforced composite materials, which uses tooling to assist in processing and incorporates failure handling during the processing to ultimately ensure the high precision of the parts.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A processing method for a torsion part made of fiber-reinforced composite material includes the following processing steps:

[0007] S1, Tooling Design: Design tooling based on the shape of the part blank;

[0008] S2, Part clamping and positioning: Positioning and clamping the part blank on the designed tooling;

[0009] S3, AB area rough machining: Perform rough machining on the shape of part A area and part B area twice;

[0010] S4, Failure Handling: Remove the part along with the fixture and perform failure handling. Leave enough space for natural failure and vibration failure. Vibration failure is relatively more efficient. After failure handling, measure the coordinate measuring machine (CMM) of the part and fixture (determine the variables).

[0011] S5, Milling the reference surface: Mill the reference surface by keeping the three sets of fixture positioning surfaces on the same horizontal plane.

[0012] S6, AB area semi-finishing: semi-finishing the shape of part A and part B;

[0013] S7, AB area finishing: Finishing the shape of part A and part B;

[0014] S8, C area machining: The C area of ​​the part is processed sequentially as roughing, secondary roughing, semi-finishing, and finishing.

[0015] S9, Remove end face: Use coordinate measuring machine to remove the end connection part, and the machining is complete;

[0016] S10, Inspect the finished product.

[0017] The tooling includes a positioning base plate, and the positioning top plate includes two sets, one front and one back. The positioning base plate is provided with clamps A and E at both ends, clamps C in the middle, and clamps B and D are provided on the left and right sides adjacent to clamps C, respectively.

[0018] Part A is clamped between clamp A and clamp B, part C is clamped between clamp B and clamp D, and part B is clamped between clamp D and clamp E.

[0019] The specific steps of step S2 are as follows: After the positioning base plate is installed, clamps A and E are used to position the two ends of the part blank, and clamp C is used to position the middle of the part blank. The clamps and the positioning base plate are connected by positioning pins and screws. The clamps position the blank, and clamp C is fully attached to the blank and pressed tightly. Clamps A and E prevent the blank from being inconsistent in state, and then they are fixed and pressed tightly.

[0020] Steps S3, S7, and S8 all involve processing part A and part B.

[0021] Step S10 specifically involves: using fixtures B and D to position and process part A and part B, then removing fixture C and performing roughing, secondary roughing, semi-finishing, and finishing on part C.

[0022] After semi-finishing part A and part B in step S7, failure treatment can be selected again according to the degree of part deformation.

[0023] Based on the above technical solution, the following technical effects can be achieved:

[0024] 1. Compared with traditional processing technology, it reduces the waste of plywood raw materials (current process blanks only need to be enlarged by 5-10mm along the shape of the part and lengthened by 10-15mm at the end face). Due to the special structure of its blank (fiber material is laid up along the surface of the part), the integrity of the fiber layer is greatly preserved, its complete internal structure and its excellent mechanical properties are preserved.

[0025] 2. This process solves the problems of stress deformation and datum misalignment caused by the processing of tortuous parts of fiber-reinforced composite materials. The processing accuracy of tortuous parts of fiber-reinforced composite materials can be ≤0.2mm, which greatly improves the production efficiency and high precision of the products and has significant economic and social value. Attached Figure Description

[0026] Figure 1 This is a process flow diagram of the present invention;

[0027] Figure 2 This is a top view of the assembly of the present invention;

[0028] Figure 3 This is a front view of the assembly of the present invention;

[0029] Figure 4 This is a schematic diagram of the tooling structure of the present invention;

[0030] Figure 5 This is a top view of the clamp in this invention;

[0031] Figure 6 This is a side view of the present invention.

[0032] In the diagram, 1-positioning base plate, 2-clamp A, 3-clamp B, 4-clamp C, 5-clamp D, 6-clamp E, 7-part A area, 8-part B area, 9-part C area. Detailed Implementation

[0033] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0034] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device 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 limiting this invention.

[0035] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1-6 As shown, a processing method for a torsion part made of fiber-reinforced composite material includes the following processing steps:

[0038] S1, Tooling Design: Design tooling based on the shape of the part blank;

[0039] S2, Part clamping and positioning: Positioning and clamping the part blank on the designed tooling;

[0040] S3, AB area rough machining: Perform rough machining on the shape of part A area 7 and part B8 area twice;

[0041] S4, Failure Handling: The part, along with the fixture, is removed and subjected to failure handling. Sufficient space is left for natural failure and vibration failure to be employed. Vibration failure is relatively more efficient. After failure handling, the part, along with the fixture, is measured using a coordinate measuring machine to determine the variables.

[0042] S5, Milling the reference surface: Mill the reference surface by keeping the three sets of fixture positioning surfaces on the same horizontal plane.

[0043] S6, AB area semi-finishing: semi-finishing the shape of part A area 7 and part B area 8;

[0044] S7, AB area finishing: finishing the shape of part A area 7 and part B area 8;

[0045] S8, C area machining: Perform rough machining, secondary rough machining, semi-finishing, and finishing on part C area 9 in sequence;

[0046] S9, Remove end face: Use coordinate measuring machine to remove the end connection part, and the machining is complete;

[0047] S10, Inspect the finished product.

[0048] The tooling includes a positioning base plate 1, the positioning top plate 1 includes two sets, front and back, the positioning base plate 1 is provided with clamps A2 and E6 at both ends, clamps C4 is provided in the middle, and clamps B3 and D5 are provided on the left and right sides adjacent to clamps C4 respectively.

[0049] Part A area 7 is clamped between clamp A2 and clamp B3, part C area 9 is clamped between clamp B3 and clamp D5, and part B area 8 is clamped between clamp D5 and clamp E6.

[0050] The specific steps of step S2 are as follows: After the positioning base plate 1 is installed, clamps A2 and E6 are used to position the two ends of the part blank, and clamp C4 is used to position the middle of the part blank. The clamps are connected to the positioning base plate 1 by positioning pins and screws. The clamps position the blank, and clamp C4 is fully attached to the blank and pressed tightly. Clamps A2 and E6 prevent the blank from being inconsistent in state, and then they are fixed and pressed tightly.

[0051] Steps S3, S7, and S8 all involve processing part A area 7 and part B area 8.

[0052] Step S10 specifically involves: using fixtures B3 and D5 to position and process part A area 7 and part B area 8, then removing fixture C4 and performing roughing, secondary roughing, semi-finishing, and finishing on part C area 9.

[0053] After semi-finishing part A area 7 and part B area 8 in step S7, failure treatment can be selected again according to the degree of part deformation.

[0054] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A processing method for twisted parts made of fiber-reinforced composite materials, characterized in that, The processing steps include the following: S1, Tooling Design: Design tooling based on the shape of the part blank; S2, Part clamping and positioning: Positioning and clamping the part blank on the designed tooling; S3, AB area rough machining: The parts A (7) and B (8) areas are rough machined twice; S4, Failure handling: The part and the fixture are removed together and the failure handling is performed. After the failure handling, the part and the fixture are measured with coordinate measuring machines to determine the deformation. S5, Milling the reference surface: Mill the reference surface by keeping the three sets of fixture positioning surfaces on the same horizontal plane. S6, AB area semi-finishing: semi-finishing the shape of part A area (7) and part B area (8); S7, AB area finishing: finishing the shape of part A area (7) and part B area (8); S8, C area machining: The C area (9) of the part is processed in sequence as roughing, secondary roughing, semi-finishing and finishing; S9, Remove end face: Use coordinate measuring machine to remove the end connection part, and the machining is complete; S10, Inspect finished products; The tooling includes a positioning base plate (1), which includes two sets, front and back. The positioning base plate (1) is provided with clamps A (2) and E (6) at both ends, and clamps C (4) in the middle. Clamps B (3) and D (5) are provided on the left and right sides adjacent to clamps C (4), respectively. The specific steps of step S2 are as follows: After the positioning base plate (1) is installed, clamps A (2) and E (6) are used to position the two ends of the part blank, and clamps C (4) is used to position the middle of the part blank. The clamps and the positioning base plate (1) are connected by positioning pins and screws. The clamps position the blank, and clamps C (4) is fully attached to the blank and pressed tightly. Clamps A (2) and E (6) prevent the blank from being inconsistent in state, and then they are fixed and pressed tightly. The specific steps of step S10 are as follows: After using fixtures B (3) and D (5) to position and process part A area (7) and part B area (8), fixture C (4) is removed, and part C area (9) is roughed, second roughed, semi-finished and finished.

2. The processing technology for twisted parts of fiber-reinforced composite materials according to claim 1, characterized in that, Part A area (7) is clamped between clamp A (2) and clamp B (3), part C area (9) is clamped between clamp B (3) and clamp D (5), and part B area (8) is clamped between clamp D (5) and clamp E (6).

3. The processing technology for twisted parts of fiber-reinforced composite materials according to claim 1, characterized in that, Both steps S3 and S7 involve the processing of part A area (7) and part B area (8).

4. The processing technology for twisted parts of fiber-reinforced composite materials according to claim 1, characterized in that, After the semi-finishing of part A (7) and part B (8) in step S7, failure treatment can be selected again according to the degree of part deformation.

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