A method for designing the layout of a ring longitudinal reinforcement multi-wire end structure

Abstract

This invention discloses a design method for the arrangement of multiple threaded heads in a ring longitudinal rib structure. The method mainly includes determining the basic parameters of the tooling and mold; determining the control parameter Y for the horizontal operation of the multiple ring longitudinal rib threaded heads; determining the required sway angle α of the threaded heads on both sides of the multiple longitudinal rib threaded heads; determining the horizontal spacing control parameter x of the multiple longitudinal rib threaded heads; and determining the vertical arrangement control parameter z of the longitudinal rib threaded heads. This invention can control the structural arrangement of single or multiple longitudinal rib threaded heads and single or multiple ring longitudinal rib threaded heads, greatly improving the processing efficiency of longitudinal ring mesh ribs in cylindrical molds. It is also applicable to the processing of longitudinal ring mesh ribs in molds of different diameters within a given range, achieving adaptive adaptation between the arrangement of the ring longitudinal rib multi-threaded head structure and the mold radius.

Description

Technical Field

[0001] This invention belongs to the field of automated fiber placement molding of composite materials, and relates to a design method for the arrangement of multiple fiber placement heads of ring longitudinal ribs. Background Technology

[0002] Longitudinal ring mesh reinforcement is a common form of composite material reinforcement structure. Compared with other components, under the same conditions, it does not increase the thickness of the product, and can ensure that the mesh reinforcement structure has higher strength and stiffness while minimizing the weight of the reinforced structure. Therefore, it is widely used in aerospace, shipbuilding and other fields. Especially in some rotating structures, such as the interstage section, fairing, fuel tank and load-bearing cylinder of launch vehicles, the ring longitudinal mesh reinforcement structure made of carbon fiber composite material greatly reduces the weight of the structural components and saves costs.

[0003] Early composite mesh reinforcement fiber placement was mostly done manually, which was time-consuming, labor-intensive, and inefficient. Later, specialized fiber placement heads for mesh reinforcement were developed, greatly improving processing efficiency. For automated fiber placement fixtures with multiple placement heads for longitudinal and ring reinforcement, during processing, multiple ring reinforcement fiber placement heads or multiple longitudinal reinforcement fiber placement heads need to work together simultaneously as the spindle of the longitudinal and ring mesh reinforcement mold rotates. Therefore, a calculation method needs to be designed to control the posture of each longitudinal and ring reinforcement fiber placement head and enable the longitudinal and ring reinforcement fiber placement head to adapt to changes in the mold radius. Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses a method for designing the arrangement of multiple wire-laying structures with circumferential longitudinal ribs, which can adaptively control the posture of cylindrical molds with different radii.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a design method for a multi-wire-layout structure arrangement of circumferential longitudinal reinforcement, comprising the following steps.

[0006] Step S1: Determine the basic parameters of the tooling and mold, including the mold diameter D, which is applicable to 1100mm-1700mm; the ring rib spacing L1, which is 60mm-200mm; the longitudinal rib spacing L2, which is 80mm-200mm; and the length L of the wire laying machine arm.

[0007] Step S2: Determine the control parameters for the horizontal multi-ring reinforcement threading head operation. The spacing between the ring reinforcement threading heads is determined by parameter Y, i.e., ring reinforcement spacing Y = L1.

[0008] Step S3: Calculate the required sway angle for the two outer ends of the longitudinal reinforcement threads based on known parameters, and introduce the sway angle parameter α. When the number of longitudinal reinforcements is odd: Sway angle parameter α... (i is the sequence number of the longitudinal reinforcement on both sides); when the number of longitudinal reinforcements is even: the deflection angle parameter α. (i is the corresponding sequence number of the longitudinal reinforcement on both sides). Through the above formula, it can be concluded that when multiple longitudinal reinforcement wire laying heads work at the same time, when the number of longitudinal reinforcement wire laying heads is odd, the wire laying head in the middle is in a vertical state, and the wire laying heads on the outer two sides need to be deflected by ±α angle. This gives one of the control parameters for the arrangement of longitudinal reinforcement wire laying heads: deflection angle α.

[0009] Step S4: Next, determine the horizontal spacing control parameter x for multiple longitudinal reinforcement wire laying heads. Introduce the horizontal spacing parameter x, which controls the horizontal axis movement distance. When the number of longitudinal reinforcement wire laying heads is odd: When the number of longitudinal reinforcement threads is even: One of the control parameters for the arrangement of longitudinal reinforcement wire ends is the horizontal spacing x.

[0010] Step S5: Calculate the vertical arrangement control parameters for the longitudinal reinforcement wire laying heads, introducing the vertical movement distance parameter z, which controls the vertical distance between the two outer longitudinal reinforcement wire laying heads and the rotating axis of the robot arm between the middle longitudinal reinforcement wire laying head. When the number of longitudinal reinforcement wire laying heads is odd: When the number of longitudinal reinforcement threads is even: One of the control parameters for the arrangement of longitudinal reinforcement wire ends is: vertical height movement distance z.

[0011] Furthermore, based on the above steps regarding the design of the multi-threaded reinforcement structure layout, four sets of parameters for controlling the multi-threaded reinforcement can be obtained: Y, α, x, and z. These four sets of control parameters enable the structural layout control of multiple longitudinal reinforcement threads and multiple circumferential reinforcement threads.

[0012] The present invention has the following advantages and benefits:

[0013] 1. Compared with the commonly used single longitudinal rib wire laying head and single ring rib wire laying head, this design can realize the control of the structural arrangement of one or more longitudinal rib wire laying heads and one or more ring rib wire laying heads. Among them, the three parameters α, x, and z can control multiple longitudinal rib wire laying heads to work in coordination at the same time, and the Y parameter can control multiple ring rib wire laying heads to work in coordination at the same time, which greatly improves the processing efficiency of longitudinal and ring mesh ribs of cylindrical molds.

[0014] 2. This solution is applicable to the processing of longitudinal ring mesh reinforcement in molds of different diameters within the range, and can achieve adaptive arrangement of the multi-threading head structure of the ring longitudinal reinforcement with the mold radius; it is suitable for laying longitudinal ring mesh reinforcement in cylindrical molds with a maximum diameter of 1700mm and a minimum diameter of 1100mm, and can simultaneously control the posture of multiple longitudinal reinforcement threading heads as well as the posture control of the maximum number of ring reinforcement threading heads. Attached Figure Description

[0015] Figure 1 Schematic diagram for controlling the arrangement of multiple wire lay ends of ring reinforcement;

[0016] Figure 2 A schematic diagram showing the deflection angle parameters of the longitudinal reinforcement with multiple wire lay ends;

[0017] Figure 3 A schematic diagram showing the control parameters for the horizontal spacing of the multiple wire lay ends of the longitudinal reinforcement;

[0018] Figure 4 This is a schematic diagram showing the vertical distance control parameters for the multi-threaded longitudinal reinforcement robotic arm. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0020] This implementation example presents a design method for a structural arrangement scheme with four ring reinforcement threads and three longitudinal reinforcement threads, including:

[0021] Step 1: Determine the basic parameters of the tooling and mold, including the mold diameter D. In this case, the mold diameter is selected as 1600mm; the ring rib spacing L1 is 100mm; the longitudinal rib spacing L2 is 100mm; and the wire laying machine arm length L is 500mm.

[0022] Step 2: Determine the control parameters for the horizontal multi-ring reinforcement threading head operation. The spacing between the ring reinforcement threads is determined by parameter Y, i.e., the ring reinforcement spacing Y = 100mm. Figure 1 .

[0023] Step 3: Calculate the required sway angle for the two outer ends of the three longitudinal reinforcement threads based on the known parameters, and introduce the sway angle parameter α. The above formula shows that when the three longitudinal reinforcement wire laying heads work simultaneously, the middle wire laying head is vertical, while the outer two wire laying heads need to be skewed by ±7.162°. This yields one of the control parameters for the longitudinal reinforcement wire laying head arrangement: the skew angle α. Figure 2 .

[0024] Step 4: Next, determine the horizontal spacing control parameter x for the three longitudinal reinforcement wire laying heads. Introduce the horizontal spacing parameter x, which controls the horizontal axis movement distance. One of the control parameters for the arrangement of longitudinal reinforcement wire ends is the horizontal spacing x, such as... Figure 3 .

[0025] Step 5: Calculate the vertical arrangement control parameters for the longitudinal reinforcement wire laying heads, introducing the vertical movement distance parameter z, which controls the vertical distance between the two outer longitudinal reinforcement wire laying heads and the middle longitudinal reinforcement wire laying head on the robot arm's rotation axis. One of the control parameters for the arrangement of longitudinal reinforcement threads is the vertical height movement distance z, such as... Figure 4 .

[0026] Furthermore, based on the above steps, four sets of parameters for controlling the multiple ribbed wire lay-ups are obtained: Y = 100 mm, α = 7.162°, x = 162.078 mm, z = 10.143 mm. The four sets of control parameters can realize the structural arrangement control of three longitudinal ribbed wire lay-ups and multiple ring ribbed wire lay-ups.

[0027] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A method for designing the arrangement of a multi-wire-lay structure with circumferential longitudinal reinforcement, characterized in that, Includes the following steps: Step S1: Determining the basic parameters of the tooling and mold. The multi-rib wire laying head tooling includes three longitudinal rib wire laying heads, four ring rib wire laying heads, and a support structure. The mold and tooling parameters include the mold diameter D, the ring rib spacing L1, the longitudinal rib spacing L2, and the length L of the wire laying robot arm. Step S2: Determine the control parameters for the horizontal multi-ring reinforcement thread laying head operation; the spacing of the ring reinforcement thread laying heads is introduced by parameter Y, i.e., the ring reinforcement spacing Y = L1; Step S3: Calculate the number of longitudinal reinforcement threads in the three longitudinal reinforcement threads based on the known parameters; The outermost wire-laying head needs to be deflected at a certain angle, so the deflection angle parameter α is introduced; Step S4: Next, determine the horizontal spacing control parameter x of the three longitudinal reinforcement wire laying heads; Step S5: Calculate the vertical arrangement control parameters for the longitudinal reinforcement wire lay-up heads, introducing the vertical movement distance parameter z; Step S3: Deflection angle parameter α, The above formula shows that when the three longitudinal reinforcement wire laying heads work simultaneously, the middle wire laying head is vertical, while the outer two wire laying heads need to be tilted by ±α angles. This gives one of the control parameters for the arrangement of the longitudinal reinforcement wire laying heads: the tilt angle α. In step S4, the horizontal spacing control parameter x of the three longitudinal reinforcement wire laying heads is introduced, which is the parameter for controlling the horizontal axis movement distance. Horizontal spacing x; Step S5: Vertical movement distance parameter z; The offset is the vertical distance parameter controlling the rotation axis of the robot arm between the two outer longitudinal reinforcement wire laying heads and the middle longitudinal reinforcement wire laying head. Vertical height movement distance z.

2. The method for designing the arrangement of multiple wire-lay heads of a ring longitudinal reinforcement structure according to claim 1, characterized in that, Step S1 includes the following: the diameter D of the mold, which is applicable to a range of 1100mm-1700mm; the spacing L1 of the ring ribs, which is in the range of 60mm-200mm; and the spacing L2 of the longitudinal ribs, which is in the range of 80mm-200mm.

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