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CN-122008538-A - Double-component material printing system and method based on FDM printing technology

CN122008538ACN 122008538 ACN122008538 ACN 122008538ACN-122008538-A

Abstract

The application discloses a double-component material printing system and a method based on an FDM printing technology, wherein the double-component material printing system based on the FDM printing technology comprises a hollow tubular feeding wire, an extrusion stripping device, a static mixing nozzle, a curing control module and a control system; the hollow tubular feed material is of a two-component pre-packaging structure. In the dual-component material printing system, the hollow tubular feed material adopts the standardized outer diameter of phi 1.75mm or phi 2.85mm, can be directly matched with the feed channel of the existing FDM printer, can realize modification and upgrading without large-scale modification of original equipment, adopts a double-channel coaxial structure or a parallel double-microtube outer coating structure, adopts a low-friction and easily-stripped PTFE, PA12 or PE material as an outer layer protection tube, ensures the tightness in the storage and transportation process, can be efficiently matched with an extrusion stripping device, fully utilizes the basic structure of the existing FDM equipment, and reduces the use cost and the technical switching difficulty of users.

Inventors

  • ZHANG WENYI
  • ZHOU JIYAO

Assignees

  • 浙江创立德科技有限公司

Dates

Publication Date
20260512
Application Date
20260127

Claims (9)

  1. 1. The double-component material printing system based on the FDM printing technology is characterized by comprising a hollow tubular feeding wire, an extrusion stripping device, a static mixing nozzle, a curing control module and a control system; The hollow tubular feed wire is of a two-component pre-packaging structure, and A, B two-component liquid materials are stored in the hollow tubular feed wire; the extrusion stripping device is suitable for pulling the hollow tubular feed wire rod and stripping the outer protective tube of the hollow tubular feed wire rod along the axial direction of the wire rod to release A, B two-component liquid materials inside the hollow tubular feed wire rod; The static mixing nozzle is internally provided with a static mixing structure and is suitable for receiving A, B two-component liquid materials released by the extrusion stripping device and uniformly mixing the two-component liquid materials; the solidification control module is suitable for carrying out in-situ solidification on the mixed materials output by the static mixing nozzle; The control system is suitable for coordinating the operation of the extrusion stripping device, the static mixing nozzle and the curing control module so as to stabilize the mixing proportion, the feeding flow and the curing parameters of A, B two-component liquid materials in the printing process.
  2. 2. The printing system of two-component materials based on FDM printing technology according to claim 1, wherein the hollow tubular feeding wire is of a double-channel coaxial structure or a parallel double-microtube outer cladding structure, the outer diameter of the hollow tubular feeding wire is phi 1.75mm or phi 2.85mm, the outer layer protection tube material of the hollow tubular feeding wire is PTFE, PA12 or PE, the inner isolation film of the coaxial structure of the hollow tubular feeding wire is polytetrafluoroethylene or a biodegradable film, and A, B components in the hollow tubular feeding wire are independently stored in a sealing manner.
  3. 3. The FDM printing technology based two-component material printing system of claim 1, wherein the extrusion stripping device comprises a traction unit, a blade module, and a waste pipe recovery channel, wherein: The traction unit comprises a gear or roller pair after surface treatment, and the traction unit is made of aluminum alloy or stainless steel; The blade of the blade module is made of hard alloy or ceramic, the angle of the cutting edge of the blade module is 25-35 degrees, and the stripping length of the blade module is adjustable within the range of 10-60mm; The waste pipe recycling channel comprises a guide groove and a collecting winding drum or a waste box.
  4. 4. The printing system of the two-component material based on the FDM printing technology according to claim 1, wherein the static mixing structure of the static mixing nozzle is a multi-section spiral blade structure, a Kenics type structure or a baffle plate composite structure, the number of mixed unit sections of the static mixing structure is 4-20 sections, the nozzle aperture of the static mixing nozzle is 0.2-1.0mm, the inner wall of the static mixing nozzle is provided with a DLC or PTFE anti-sticking coating, and a quick shutoff valve is arranged in the static mixing nozzle.
  5. 5. A method of FDM printing of a two-component material based on the system of any one of claims 1-4, comprising the steps of: S1) connecting a hollow tubular feed material of a pre-packaged A, B two-component liquid material into a feed channel of an FDM printer, and driving the hollow tubular feed material to feed through a traction unit of an extrusion stripping device; S2) cutting and stripping an outer layer protection tube of the hollow tubular feed wire by utilizing a blade module of the extrusion stripping device along the axial direction of the hollow tubular feed wire, releasing A, B two-component liquid materials in the hollow tubular feed wire, and collecting stripped waste tubes through a waste tube recovery channel of the extrusion stripping device; s3) synchronously feeding the A, B two-component liquid materials into a static mixing nozzle, alternately shearing, layering and then converging through a static mixing structure arranged in the static mixing nozzle to realize uniform mixing; S4) starting a curing control module according to the material type, so that the mixed material is cured in situ in the deposition process; S5) the traction speed of the extrusion stripping device, the mixing proportion of A, B components and the curing parameters of the curing control module are regulated in real time through a PID closed-loop algorithm of the control system, and printing molding is completed.
  6. 6. The method according to claim 5, wherein in step S1, the drawing speed of the hollow tube-shaped feed material and the flow rate of the liquid in the hollow tube-shaped feed material satisfy a relationship Wherein Q is the instantaneous flow rate, V is the drawing speed of the hollow tubular feed wire, And maintaining A, B the flow ratio of the components to meet the target proportion by adjusting the traction speed of the hollow tubular feeding wire material for the total sum of the inner channel cross sections of the hollow tubular feeding wire material.
  7. 7. The method according to claim 5, wherein in step S3, the nozzle section of the static mixing nozzle is sequentially divided into a mixing section, a converging section and an outlet section, wherein: The mixing section is a section where the static mixing structure is located, the convergence section is of a conical transition structure, the outlet cone angle is 15-30 degrees, the outlet diameter of the outlet section can be 0.25mm, 0.4mm, 0.6mm, 0.8mm or 1.0mm, a circle of micro electric heating ring is additionally arranged at the nozzle opening of the static mixing nozzle, and PID temperature control is adopted by the micro electric heating ring.
  8. 8. The printing method of two-component materials based on FDM printing technology according to claim 5, wherein in step S4, the curing control module includes a thermal curing unit, a UV-LED photo-curing unit and a catalytic self-curing unit, and the curing modes are correspondingly matched according to the material characteristics: When the material is thermosetting, the micro electric heating ring of the nozzle opening of the static mixing nozzle is matched with the thermosetting unit, and the temperature is controlled at 40-150 ℃ in a PID temperature control mode so as to realize curing; When the material is photosensitive, the UV-LED light curing unit irradiates 365-405nm UV-LEDs to realize curing; When the material is chemically self-curing, the self-reaction time of the material is matched by regulating and controlling the mixing proportion of A, B components and the feeding rate of the extrusion stripping device so as to finish curing.
  9. 9. The method for printing a two-component material based on FDM printing according to claim 5, wherein after the printing is finished, the static mixing nozzle and the mixing structure built in the static mixing nozzle are rinsed and cleaned: when the printing material is washable, injecting warm water into the system through a solution mixing channel for flushing; when the material used for printing is non-washable, washing is performed by injecting an appropriate solvent through a solution mixing channel of the system.

Description

Double-component material printing system and method based on FDM printing technology Technical Field The invention relates to the technical field of additive manufacturing, in particular to a two-component material printing system and method based on an FDM printing technology. Background In the current mainstream 3D printing technology, fused Deposition Modeling (FDM) is one of the widely applied technologies, and is realized by drawing thermoplastic material wires (such as PLA, ABS, TPU, etc.) and fused deposition, so that the important market share is occupied by virtue of the advantages of strong equipment universality and convenience in operation, liquid silica gel (LSR) printing is used as a special technology for liquid silica gel materials, a dual-pump quantitative mixing system is generally adopted to complete the material supply and mixing, and dual-component material printing focuses on a/B two-component reaction curing material (such as dual-component silica gel, epoxy resin, polyurethane, etc.), so that the material mixing and curing process needs to be ensured by special equipment. The existing 3D printing technologies have obvious short plates, the application range of the FDM technology is limited to thermoplastic solid materials, liquid or reaction curing type materials are difficult to directly process, the material adaptation capability of the FDM technology is greatly limited, a double-pump quantitative mixing system adopted by liquid silica gel printing is complex in structure and comprises more precise parts, the subsequent maintenance operation difficulty is high, the maintenance cost is high, the mixing proportion, the mixing uniformity and the reaction time of the two components A/B are extremely high, the existing equipment meeting the requirements is an industrial large-scale system, the problems of large size, high cost, complex operation and the like exist, the desktop application scene cannot be adapted, and although the FDM model has good universality, the prior art cannot solve the adaptation problem of the FDM model and the two-component liquid material printing, and the printing of the two-component liquid material cannot be directly realized by using FDM equipment. Therefore, what is needed is a printing system capable of converting liquid two-component materials into materials capable of being fed in an FDM mode, the system can be compatible with the structural design of the existing FDM equipment, adaptation can be achieved without large-scale transformation, accurate mixing and reaction curing printing of the two-component liquid materials can be achieved, the material application limit of the existing FDM technology is broken through, the material system of desktop 3D printing is greatly expanded, and the printing requirements of various two-component reaction curing materials in a desktop scene are met. Disclosure of Invention The invention aims to provide a two-component material printing system and method based on an FDM printing technology, which are used for solving the problems in the prior art in the background technology. In order to achieve the above purpose, the invention provides a technical scheme that a two-component material printing system based on FDM printing technology comprises a hollow tubular feeding wire, an extrusion stripping device, a static mixing nozzle, a solidification control module and a control system; The hollow tubular feed wire is of a two-component pre-packaging structure, and A, B two-component liquid materials are stored in the hollow tubular feed wire; the extrusion stripping device is suitable for pulling the hollow tubular feed wire rod and stripping the outer protective tube of the hollow tubular feed wire rod along the axial direction of the wire rod to release A, B two-component liquid materials inside the hollow tubular feed wire rod; The static mixing nozzle is internally provided with a static mixing structure and is suitable for receiving A, B two-component liquid materials released by the extrusion stripping device and uniformly mixing the two-component liquid materials; the solidification control module is suitable for carrying out in-situ solidification on the mixed materials output by the static mixing nozzle; The control system is suitable for coordinating the operation of the extrusion stripping device, the static mixing nozzle and the curing control module so as to stabilize the mixing proportion, the feeding flow and the curing parameters of A, B two-component liquid materials in the printing process. Preferably, the hollow tubular feeding wire is of a double-channel coaxial structure or a parallel double-microtube outer cladding structure, the outer diameter of the hollow tubular feeding wire is phi 1.75mm or phi 2.85mm, the outer layer protection tube of the hollow tubular feeding wire is made of PTFE, PA12 or PE, the inner isolation film of the coaxial structure of the hollow tubular feeding wire is made of po