A processing method for stepped hole Z-direction reinforced core material

Abstract

The present invention discloses a processing method of a stepped hole type Z-direction reinforced core material, comprising the following steps: first, preparing a foam plate, selecting a suitable variable diameter needle according to the thickness of the foam plate, and drawing out the continuous fiber yarn and passing it through the hollow tube of the variable diameter needle, and adjusting the needle to 45° / 60°; then, positioning and fixing the foam plate on a conveying platform, setting the puncture spacing and turning on the puncture device, and completing the puncture of +45° / +60° as the conveying platform moves. The processing method of the stepped hole type Z-direction reinforced core material enables the obtained core material to have good Z-direction compressive performance, and can also provide excellent shear resistance and peel strength, ensuring the stability and uniformity of the core material performance.

Description

Technical field:

[0001] The invention relates to the field of new materials, in particular to a processing method for a stepped hole type Z-direction reinforced core material. Background technology:

[0002] The existing hollow puncture needles have a relatively thick diameter, which results in larger holes in the core material, a large amount of resin is required for the subsequent infusion, and the overall weight is heavy after infusion. The use of thin needles also causes problems such as bending and deformation of the needles, deviation of the puncture angle, and bending and breaking of the needles due to insufficient rigidity. Solid needles can use thin needles and have sufficient rigidity, but they are only suitable for the puncture of short-cut fibers and cannot achieve Z-direction fiber continuity, which greatly reduces the performance of the core material. Summary of the invention:

[0003] The technical problem to be solved by the present invention is to provide a processing method for a stepped hole type Z-direction reinforced core material which provides good Z-direction compressive resistance, excellent shear resistance and peel strength, and ensures stable and uniform performance of the core material.

[0004] The technical solution of the present invention is to provide a processing method for a stepped hole type Z-direction reinforced core material, comprising the following steps: first, prepare a foam board, select a corresponding reducing needle according to the thickness of the foam board, lead out the continuous fiber yarn and pass it through the hollow tube of the reducing needle, and adjust the needle to 45° / 60°; then, position and fix the foam board on the conveying platform, set the puncture spacing and start the puncture device, and complete the +45° / +60° puncture as the conveying platform moves; then, flip the entire foam board 180° and transfer it to the feed end, position it on the conveying platform again, and repeat the above steps to complete the -45° / -60° puncture; obtain a ±45° / ±60° Z-direction reinforced structural core material, and finally pour molten resin or thermosetting resin into the stepped hole of the Z-direction reinforced structural core material or the entire board to solidify and form the Z-direction reinforced structural core material.

[0005] Preferably, the variable diameter needle comprises a needle tip, a puncture rod and a hollow enlarged diameter tube, wherein the needle tip is connected to the front end of the puncture rod, the rear end of the puncture rod is connected to the front end of the hollow enlarged diameter tube, and the diameter of the puncture rod is smaller than the diameter of the hollow enlarged diameter tube.

[0006] Preferably, the diameter of the hollow expanded tube is 2-4 times the diameter of the acupuncture rod.

[0007] Preferably, the reducing portion of the reducing needle adopts a 1:1-1:5 chamfer for uniform transition.

[0008] Preferably, the core material has a density of 35-100 Kg / m 3 Polyurethane foam, foam thickness is 5-100mm, single piece foam size is 1200mm×2400mm.

[0009] Preferably, the Z-direction reinforcing material is 100tex-1200tex untwisted glass fiber yarn.

[0010] Preferably, the Z-direction puncture angle is ±45° to ±60°, and the puncture spacing is 10-200 mm. Products with an angle of ±45° can provide the best shear performance, and products with an angle of ±60° can provide more compression resistance.

[0011] Compared with the prior art, the present invention has the following advantages after adopting the above scheme: the variable diameter hollow needle is adopted, the thick diameter part provides sufficient strength support, and the thin diameter part serves as the puncture body, reducing the size of the puncture hole; at the same time, the length of the thin diameter part is reduced to reduce the aspect ratio and improve the puncture rigidity; the Z-direction fiber is brought into the core material body through the hollow tube to maintain the continuity of the fiber. In addition, this scheme adopts bidirectional and angled puncture, which can provide good Z-direction compressive performance, as well as excellent shear resistance and peeling strength; at the same time, in terms of practicality, the volume of the plate hole after the variable diameter needle hole is greatly reduced, which can save the amount of resin for subsequent injection molding, and the Z-direction fiber is continuous and uninterrupted, ensuring the stability and uniformity of product performance. Description of the drawings:

[0012] Figure 1 This is a schematic diagram of the Z-direction reinforced core material structure of the present invention.

[0013] Figure 2 for Figure 1 AA schematic diagram.

[0014] Figure 3 It is a schematic structural diagram of the variable diameter needle of the present invention. Specific implementation method:

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] A processing method for a stepped hole type Z-direction reinforced core material includes the following steps: first, prepare a foam board, select a suitable reducer needle according to the thickness of the foam board, lead out the continuous fiber yarn and pass it through the hollow tube of the reducer needle, and adjust the needle to 45° / 60°; then, position and fix the foam board on a conveying platform, set the puncture spacing and start the puncture device, and complete the +45° / +60° puncture as the conveying platform moves; then, flip the entire foam board 180° and transfer it to the feed end, and position it on the conveying platform again, and repeat the above steps to complete the -45° / -60° puncture; obtain a ±45° / ±60° Z-direction reinforced structural core material; finally, pour molten resin or thermosetting resin into the stepped hole of the Z-direction reinforced structural core material or the entire board, and solidify to form the Z-direction reinforced structural board. The formed product is such as Figure 1 and 2shown.

[0017] Among them, in this embodiment, if Figure 3 As shown, the needle is a hollow stepped variable-diameter needle with a total length of 380 mm, wherein the length of the thin-diameter portion, i.e., the pricking rod 1, can be changed according to the thickness of the plate, generally being 1 / 2 of the thickness of the plate, with an outer diameter of 1.0-1.5 mm and an inner diameter of 0.5-1.0 mm; the length of the thick-diameter portion, i.e., the variable-diameter hollow tube 2, is the total length minus the length of the thin-diameter portion, with an outer diameter of 3-4 mm and an inner diameter of 2-3 mm; the middle variable-diameter portion 3 adopts a 1:1-1:5 chamfer for uniform transition to maintain the middle hollow connection state.

[0018] In addition, in this embodiment, the core material has a density of 35-100Kg / m 3 The polyurethane foam has a foam thickness of 5-100mm and a single foam size of 1200mm×2400mm. The Z-direction reinforcement material is 100tex-1200tex untwisted glass fiber yarn. In addition, the Z-direction puncture angle is ±45° to ±60°, and the puncture spacing is 10-200mm. Products with an angle of ±45° can provide the best shear performance, and products with an angle of ±60° can provide more compressive resistance.

[0019] After adopting the above technology, the following technical effects are achieved: a variable diameter hollow needle is used, the thick diameter part provides sufficient strength support, and the thin diameter part serves as the puncture body, reducing the size of the puncture hole; at the same time, the length of the thin diameter part is reduced to reduce the aspect ratio and improve the puncture rigidity; the Z-direction fiber is brought into the core material body through the hollow tube to maintain the continuity of the fiber. In addition, this solution adopts bidirectional and angled puncture, which can provide good Z-direction compressive performance, as well as excellent shear resistance and peel strength; at the same time, in terms of practicality, the volume of the plate hole after the variable diameter needle hole is greatly reduced, which can save the amount of resin for subsequent infusion molding, and the Z-direction fiber is continuous and uninterrupted, ensuring the stability and uniformity of product performance.

[0020] The above is only an explanation of the preferred embodiments of the present invention, which should not be construed as a limitation on the claims. Any equivalent structure or equivalent process changes made using the present invention specification are included in the patent protection scope of the present invention.

Claims

1. A method for processing a stepped hole Z-direction reinforced core material, characterized in that: The method comprises the following steps: first, preparing a foam sheet, selecting a suitable reducing needle according to the thickness of the foam sheet, leading out the continuous fiber yarn and passing it through the hollow tube of the reducing needle, and adjusting the needle to 45° / 60°; then, positioning and fixing the foam sheet on the conveying platform, setting the puncture interval and starting the puncture device, and completing the puncture of +45° / +60° as the conveying platform moves; then, turning the entire foam sheet 180° and transferring it to the feeding end, positioning it on the conveying platform again, and repeating the above steps, thereby completing the puncture of -45° / -60°; A ±45° / ±60° Z-direction reinforced structural core material is obtained, and finally a molten resin or a thermosetting resin is poured into the stepped hole of the Z-direction reinforced structural core material or the entire plate to solidify and form the Z-direction reinforced structural core material; The variable diameter needle comprises a needle tip, a puncture rod and a hollow expansion tube, wherein the needle tip is connected to the front end of the puncture rod, the rear end of the puncture rod is connected to the front end of the hollow expansion tube, the diameter of the puncture rod is smaller than the diameter of the hollow expansion tube; the diameter of the hollow expansion tube is 2-4 times the diameter of the puncture rod; the variable diameter part of the variable diameter needle adopts a 1:1-1:5 chamfer for uniform transition.

2. The method for processing a stepped hole Z-direction reinforced core material according to claim 1, characterized in that: Core material density 35-100Kg / m3 polyurethane foam, foam thickness is 5-100mm, single foam size is 1200mm×2400mm.

3. The method for processing a stepped hole Z-direction reinforced core material according to claim 1, characterized in that: The Z-direction reinforcement material is 100tex-1200tex untwisted glass fiber yarn.

4. The method for processing a stepped hole Z-direction reinforced core material according to claim 1, characterized in that: The Z-direction puncture angle is ±45° to ±60°, and the puncture spacing is 10-200mm.

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