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CN-121973491-A - Stretching method of high-density honeycomb core

CN121973491ACN 121973491 ACN121973491 ACN 121973491ACN-121973491-A

Abstract

The invention discloses a method for stretching a high-density honeycomb core, and belongs to the technical field of honeycomb core processing. According to the method, high-strength thermosetting adhesive films are bonded at two ends of a high-density honeycomb core block, the high-strength thermosetting adhesive films are connected with a wavy aluminum corrugated medium to form a multi-layer composite structure, the aluminum corrugated medium is used as a stretching stress carrier, and a pin tool or a clamp clamping mode is adopted to apply tension to the aluminum corrugated medium in a bidirectional manner, so that uniform unfolding of the high-density honeycomb core is realized. The invention overcomes the problems of size shortage, deformation, fracture and the like caused by the direct action of the traditional stretching mode on the honeycomb core body, has the advantages of convenient operation, adaptation to main stream stretcher equipment on the market, reduction of material and labor waste, reduction of production cost and the like, can realize the effective stretching and unfolding of the high-density honeycomb cores with various specifications and materials, is suitable for various production scenes depending on honeycomb core materials, such as aerospace, rail transit, building decoration, packaging buffering and the like, and has remarkable practical value and economic value.

Inventors

  • YANG TAO
  • LENG JIE
  • ZHANG QING

Assignees

  • 江苏鸿赞蜂窝科技有限公司

Dates

Publication Date
20260505
Application Date
20260224

Claims (7)

  1. 1. A method for stretching a high density honeycomb core, comprising Selecting a high-strength thermosetting adhesive film and a wavy aluminum corrugated medium with the adaptive specifications according to the density, thickness and materials of a high-density honeycomb core, bonding the adhesive film on two end surfaces of a honeycomb core block according to positioning marks, connecting the wavy aluminum corrugated medium on the outer side of the adhesive film, and then performing pressure curing at a constant temperature of 50-80 ℃ and a pressure of 0.1-0.3MPa to form a multi-layer composite structure of the honeycomb core block, the adhesive film and the wavy aluminum corrugated medium; Fixing the qualified composite structure after positioning and calibration on stretching equipment, selecting a pin tool or a clamp to act on the wavy aluminum corrugated core in a clamping mode according to a production scene, monitoring the tensile force in real time through a force value sensor, and applying the tensile force in a bidirectional way at a constant speed of 5-15mm/min to enable the high-density honeycomb core to be unfolded uniformly step by step; Stopping applying force after the honeycomb core is completely unfolded to be regular honeycomb and reaches a preset size, preserving heat of the honeycomb core for 15-30min in a constant temperature environment of 40-60 ℃, shaping, and trimming the edges of the honeycomb core after shaping to obtain a high-density honeycomb core finished product; and step four, stripping the wave-shaped aluminum corrugated medium after the stretching operation, and putting the qualified aluminum corrugated medium into a composite structure preparation procedure again after cleaning and flatness detection.
  2. 2. The method for stretching a high-density honeycomb core according to claim 1, wherein in the first step, when the high-strength thermosetting adhesive film is bonded, the width of the adhesive film exceeding the end face of the honeycomb core block is 5-10mm, the adhesive film is bonded with the honeycomb core block and the aluminum corrugated core without gaps, the bonding quality detection comprises visual detection of no bubbles in the adhesive layer, and the bonding strength of the peeling test adhesive layer is more than or equal to 5MPa.
  3. 3. The method according to claim 1, wherein in the step one, the specification of the corrugated aluminum core is matched according to the density, thickness and material of the honeycomb core, the aluminum high-density honeycomb core is matched with the aluminum corrugated core with the thickness of 0.1-0.3mm, and the aramid high-density honeycomb core is matched with the low-gram-weight flexible high-strength thermosetting adhesive film.
  4. 4. The method for stretching the high-density honeycomb core according to claim 1, wherein the specific operation of stretching the pin fixture in the second step is that the pin fixture with the pin diameter and the pin distance being matched with the wave height and the wave distance of the aluminum corrugated medium is inserted into a gap of 2/3 of the wave height of the aluminum corrugated medium, and the pin fixture is driven by a stretcher to apply bidirectional tension, wherein the tension does not exceed a preset force value threshold.
  5. 5. The method for stretching the high-density honeycomb core according to claim 1, wherein in the second step, the clamping and stretching operation of the calipers is performed by adding an anti-slip wear-resistant pad at the clamping position of the calipers, clamping the calipers at the edge position of the aluminum corrugated core with a clamping pressure of 0.05-0.1MPa, and applying stable bidirectional tension by manual or mechanical driving to avoid local stress concentration.
  6. 6. The method of drawing a high-density honeycomb core according to claim 1, wherein the positioning and calibrating in the second step is to calibrate the coaxial centers of the composite structure in the horizontal and vertical directions, so as to ensure that the honeycomb core block and the corrugated aluminum core have no offset, and avoid the occurrence of offset drawing in the drawing process.
  7. 7. The method for drawing the high-density honeycomb core according to claim 1, wherein in the second step, the pin fixture and the caliper are connected with drawing equipment through quick-change connectors, and the drawing equipment comprises a manual small drawing table, a full-automatic numerical control drawing machine and main stream drawing machine equipment.

Description

Stretching method of high-density honeycomb core Technical Field The invention relates to the technical field of honeycomb core processing, in particular to a stretching method of a high-density honeycomb core. Background The honeycomb core material is a high-performance sandwich structure material, can effectively bear shear stress when being clamped between two layers of panels, remarkably improves the bending rigidity of the whole structure, and is widely applied to various fields such as aerospace, rail transit, building decoration, packaging buffering and the like by virtue of excellent structural performance. The honeycomb core is in a compressed state after production and processing, cannot be directly put into practical application, and needs to be unfolded into a regular honeycomb substrate through a stretching process, and the scientificity and rationality of the stretching process directly determine the final service performance of the honeycomb core. The prior art mainly aims at a pin stretching method, a caliper clamping method, an adhesive stretching ear method and the like of a honeycomb core, but the method has obvious defects that when being applied to the stretching operation of a high-density honeycomb core, various methods directly apply tensile force to a honeycomb core body, local stress concentration is easy to occur in the stretching process, the problems of size shortage, uneven aperture, wall deformation, even breakage and the like of the honeycomb core are caused, the product qualification rate is low, auxiliary procedures such as attaching stretching ears and the like are required to be additionally arranged in part of the stretching method, the manufacturing process is long, the product qualification rate is low, repeated reworking is required to further reduce the production efficiency, a large amount of honeycomb core waste is generated due to stretching damage, additional investment of materials and labor are required to cause resource waste and high production cost, the single stretching mode is difficult to be compatible with the high-density honeycomb cores with different specifications, and the part of the method has specific requirements on stretching equipment and cannot be suitable for general equipment on the market, and has poor adaptability and limited application range. Based on the above-mentioned drawbacks of the prior art, there is a need to develop a high-density honeycomb core stretching method which can avoid direct stress of the honeycomb core, has stable stretching quality, is convenient to operate and has wide adaptability, so as to solve the problems existing in the prior art. Disclosure of Invention The invention aims to provide a stretching method of a high-density honeycomb core, which aims to solve the problems of size shortage, uneven pore diameter, wall deformation and even fracture of the honeycomb core caused by local stress concentration in the stretching process of the prior art. The technical scheme for solving the technical problems is as follows: A method of stretching a high density honeycomb core comprising the steps of: Selecting a high-strength thermosetting adhesive film and a wavy aluminum corrugated core with the adaptive specifications according to the density, thickness and material of the high-density honeycomb core, bonding the adhesive film on two end surfaces of a honeycomb core block according to positioning marks, connecting the wavy aluminum corrugated core on the outer side of the adhesive film, and then carrying out pressure curing at a constant temperature of 50-80 ℃ and a pressure of 0.1-0.3MPa to form a multi-layer composite structure of the honeycomb core block, the adhesive film and the aluminum corrugated core; The accurate stretching operation comprises the steps of fixing the qualified composite structure after positioning and calibration on stretching equipment, selecting a pin tool or a clamp to act on the wavy aluminum corrugated core in a clamping mode according to a production scene, monitoring the pulling force in real time through a force value sensor, and applying the pulling force in a bidirectional way at a constant speed of 5-15mm/min to enable the high-density honeycomb core to be unfolded uniformly step by step; Step three, shaping and trimming the finished product, namely stopping applying force after the honeycomb core is completely unfolded to be regular honeycomb and reaches a preset size, preserving heat of the honeycomb core for 15-30min in a constant temperature environment of 40-60 ℃ for shaping, and trimming the edge of the honeycomb core after shaping to obtain a high-density honeycomb core finished product; And step four, recycling the aluminum corrugated medium, namely stripping the wave-shaped aluminum corrugated medium after the stretching operation, cleaning and detecting the flatness, and putting the qualified aluminum corrugated medium into a composite structure preparation process again