Fiber additive structure method

Abstract

The invention provides a fiber material increase structure method, and belongs to the technical field of fiber material increase. The problem that in the prior art, the mechanical property of a fiber additive structure is insufficient is solved. The method comprises the following steps of: under a three-dimensional rectangular coordinate system, bending a fiber into one or more circles by taking an original point as a starting point and taking any plane as a standard at any position, penetrating through the circles once or for multiple times in a direction perpendicular to the circles, and tightening to form convex nodes; the step 1 and the step 2 are repeated at the extending interval positions in any direction, so that the fibers form a plurality of nodes at any intervals, after different fibers or the same fiber are bent into one or more rings with any plane as the standard, the fibers penetrate through the nodes which are tightened by the rings one or more times in the direction perpendicular to the rings in the step 4, and the nodes are sleeved with the nodes; or the nodes are not sleeved to form new nodes to prepare for later sleeving, and the steps 4-5 are repeated to form the finished additive structure. The device is mainly used for weaving various fibers.

Description

Technical Field

[0001] The present invention belongs to the technical field of fiber material additive manufacturing, and particularly relates to a fiber additive manufacturing structure method. Background Art

[0002] Continuous fiber additive manufacturing (CFAM) is to layer-by-layer print continuous fiber reinforced resin-based composite filaments by an additive manufacturing equipment, slice a digital model and plan paths / trajectories, and regulate process parameters such as equipment speed, temperature, printing spacing, layer thickness, etc., to realize the printing and forming of complex composite components. The additive manufacturing of continuous fiber reinforced composites breaks through the method of traditional fused deposition modeling (FDM) composite components, and is a rapid composite forming method that combines continuous fibers and resin matrix using additive manufacturing processes and methods. This method and technology have the advantages of short process flow, few manufacturing process steps, small environmental pollution, low energy consumption, etc., and can realize the integrated forming of personalized, small-batch, and complex structure components, with high application value. However, the Z-direction (interlayer) mechanical properties of continuous fiber reinforced composite components formed by planar layer-by-layer printing are insufficient, and phenomena such as shear or impact delamination are likely to occur, affecting the reliability and service life of composite components, and restricting the wide application and technology promotion of continuous fiber additive manufacturing formed composite components. Summary of the Invention

[0003] In view of this, the present invention aims to propose a fiber additive manufacturing structure method to solve the problem of insufficient mechanical properties of fiber additive manufacturing structures in the prior art.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A multi-directional stress distributed interlocking structure weaving method, which includes the following steps:

[0006] Step 1: In a three-dimensional rectangular coordinate system, a fiber starts from the origin and extends in an arbitrary direction, and the fiber is bent into one or more circles on an arbitrary plane at an arbitrary position.

[0007] Step 2: Pass through the circle one or more times in a direction perpendicular to the circle and tighten to form a raised node.

[0008] Step 3: Then repeat Step 1 and Step 2 at intervals in an arbitrary direction to make the fiber form a plurality of arbitrarily spaced nodes.

[0009] Step 4: Bend different fibers or the same fiber into one or more circles on an arbitrary plane, and then put the circle(s) onto one or more arbitrary nodes in Steps 1-3.

[0010] Step 5: Pass through the loop formed in Step 4 perpendicular to the loop direction once or multiple times to tighten and form a node that fits into the node, or form a new node without fitting into the node to prepare for future fitting. Extend the fiber by an arbitrary interval distance, and repeat Steps 4 - 5 to form a node that fits into the node to complete the additive structure.

[0011] Furthermore, in Step 1, the fiber is bent clockwise or counterclockwise.

[0012] Furthermore, in Step 4, different fibers and the fiber in Step 1 are made of the same material or different materials.

[0013] Furthermore, in Step 4, the same fiber starts from the end position where the fiber in Step 3 extends.

[0014] Furthermore, in Step 4, different fibers start from an arbitrary node.

[0015] Furthermore, in Step 4, the fiber is bent clockwise or counterclockwise into one or more loops with an arbitrary plane as the reference.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The present invention can form an extremely complex three - dimensional structure through the structure of nodes nested within nodes of one fiber or multiple fibers. This method can extend in all directions, breaking through simple three - dimensional structures and simple planar or cylindrical surfaces with thickness.

[0018] 2. The nested structure woven by the present invention has high shear strength, a long fatigue life, and a small node volume ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings that form a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 Schematic diagram of a node formed by bending counterclockwise twice and passing through the circle twice;

[0021] Figure 2 Schematic diagram of a node that fits into a node formed by bending counterclockwise twice and passing through the circle twice;

[0022] Figure 3 Schematic diagram of the same fiber having both a node that fits into a node and a node that does not fit into a node;

[0023] Figure 4 Schematic diagram of a multiple - nested node formed after fitting two nodes onto the same fiber;

[0024] Figure 5 Schematic diagram of a multiple nested node formed after inserting nodes on two different fibers;

[0025] Figure 6 Schematic diagram of a node formed by a more complex multiple nesting;

[0026] Figure 7 Schematic diagram of an additive structure formed by the mutual nesting of two different fibers;

[0027] Figure 8 Schematic diagram of an additive structure formed by three different fibers with nodes inserted and nodes not inserted; Specific implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Specific implementation mode 1: Refer to Figure 1-4 To illustrate this implementation mode, 1. A fiber additive structure method, which includes the following steps:

[0030] Step 1: In a three-dimensional rectangular coordinate system, a fiber starts from the origin and extends in an arbitrary direction. At an arbitrary position, the fiber is bent into one or more circles with an arbitrary plane as the reference;

[0031] Step 2: Pass through the circle one or more times in a direction perpendicular to the circle and tighten to form a convex node;

[0032] Step 3: Then repeat Step 1 and Step 2 at an arbitrary interval position along an arbitrary direction to make the fiber form multiple nodes at arbitrary intervals;

[0033] Step 4: After bending one or more fibers of different roots (one or more) or the same fiber into one or more circles with an arbitrary plane as the reference, use this circle to insert or not insert one or more arbitrary nodes in Steps 1-5;

[0034] Step 5: Pass through the circle one or more times in a direction perpendicular to the circle in Step 4 and tighten to form a node with an inserted node, or do not insert a node to form a new node for future insertion. Extend the fiber an arbitrary interval distance, and repeat Steps 4-5 to form a node with an inserted node to complete the additive structure.

[0035] In step 1, the fiber is bent clockwise or counterclockwise. In step 4, different fibers and the fiber in step 1 are made of the same material or different materials. For the same fiber in step 4, the starting point is the end position of the fiber in step 3. For different fibers in step 4, the starting point is any node. In step 4, the fiber is bent clockwise or counterclockwise into one or more loops with any plane as the reference.

[0036] As Figure 1 shown, in a three-dimensional rectangular coordinate system, a fiber starts from the origin and extends in any direction. At any position, with any plane as the reference, the fiber is bent clockwise or counterclockwise into one or more circles, and then passes through the circle one or more times in a direction perpendicular to the circle to tighten and form a raised node. Then, at any interval position along any direction, the above steps are repeated to form multiple nodes at arbitrary intervals on this fiber. Then, with the same fiber or different fibers (one or more), for the same fiber, the starting point is the end position of the current fiber extension. If they are different fibers, the starting point is any node. Respectively, with any plane as the reference, the fiber is bent clockwise or counterclockwise into one or more circles, and then this circle is used to enclose or not enclose one or more of the above arbitrary nodes. Then, it passes through the circle one or more times in a direction perpendicular to the circle to tighten and form a node enclosing the node, or does not enclose the node to form a new node for future enclosure. Then, the same or different fibers extend an arbitrary interval distance and continue to repeat the above steps to enclose the node to form a node enclosing the node to complete the additive structure, or do not enclose the node to form a new node for future additive manufacturing. Repeat the above steps until the required additive structure is completed.

[0037] This method has a fiber body and fiber nodes with a nested structure among the nodes. The fiber is bent into a circle and then passes through its own circle to form a node, and then other circles are used to enclose this node to form a nested structure to complete the additive structure. Since there is no need for melting materials and chemical additive manufacturing methods, it reduces energy consumption and pollution. The additive manufacturing method is convenient. Through the structure of nodes nested with nodes by one fiber or multiple fibers, an extremely complex three-dimensional structure can be formed. This method can extend in all directions, breaking through simple three-dimensional structures and simple planar or cylindrical surfaces with thickness. The nested structure woven by this method has high shear strength, a long fatigue life field, and a small proportion of node volume.

[0038] Specific implementation method 2: Refer to Figure 1-4To illustrate this embodiment, this example takes the manufacture of a deformable bulletproof insert as an example. The wire material is a NiTi shape memory alloy wire with a diameter of 0.3 mm, and the austenite phase transformation temperature As = 45 °C. Another wire material is a basalt fiber / polyphenylene sulfide (PPS) composite wire with a diameter of 0.1 mm, and the surface is coated with silicon carbide nanoparticles. A 4-layer nested structure is adopted, and the pitch gradient of the closed loop changes as P = 0.6 mm → 0.3 mm. An FBG sensor is embedded in the third layer, with a grating area length of 5 mm and a reflection wavelength of 1550 nm. In 60 °C hot water, the structure shrinkage rate of this structure reaches 98.7% of the design value. When tested with a 7.62 mm NATO bullet, the back convex depth is reduced by 37% compared with traditional ceramic inserts.

[0039] Specific Embodiment 3: Refer to Figure 1-4 To illustrate this embodiment, this example takes the deployment mechanism of a spacecraft as an example. A carbon fiber / titanium alloy composite wire is adopted, with a wire diameter ratio of 1:0.5. A 6-layer nested structure is constructed, and the phase difference is distributed according to the Fibonacci sequence. The repeated positioning accuracy of deployment reaches ±0.05 °, and there is no structural damage after 200 folding-deployment cycles.

[0040] The specific embodiments of the present invention disclosed above are only used to help illustrate the present invention. The specific embodiments do not describe all the details in detail, nor do they limit the invention to only the described specific embodiments. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention.

Claims

1. A fiber additive structure method, characterized in that: It includes the following steps: Step 1: In a three-dimensional rectangular coordinate system, a fiber is extended in any direction from the origin, and the fiber is bent into one or more circles at any position based on any plane; Step 2: Cross the circle one or more times in a direction perpendicular to the circle to tighten the raised node; Step 3: Repeat steps 1 and 2 at intervals along any direction to form multiple nodes at any intervals on the fiber; Step 4: bend different fibers or the same fiber into one or more loops based on any plane, and insert or not insert the loops into one or more arbitrary nodes in steps 1-3; Step 5: Pass through the loop in step 4 one or more times in a direction perpendicular to the loop to tighten the loop to form a node that fits into the node, or form a new node without fitting into the node to prepare for future insertion, extend the fiber at any interval, repeat steps 4-5 to form a node that fits into the node to complete the additive structure.

2. A fiber additive structure method according to claim 1, characterized in that: In step 1, the fiber is bent clockwise or counterclockwise.

3. A fiber additive structure method according to claim 1, characterized in that: The same fiber in step 4 starts from the position where the fiber extension end in step 3 was.

4. A fiber additive structure method according to claim 1, characterized in that: The different fibers in step 4 and the fibers in step 1 are made of different materials or the same material.

5. A fiber additive structure method according to claim 4, characterized in that: The different fibers in step 4 start from any node.

6. A fiber-added structure method according to any one of claims 4 or 5, characterized in that: The fiber in step 4 is bent clockwise or counterclockwise into one or more loops based on any plane.

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