Gas protection device for red light laser copper alloy 3D printing

Abstract

The utility model relates to the technical field of gas protection devices, and discloses a gas protection device for red light laser copper alloy 3D printing, which comprises a red light laser metal 3D printer body, a PLC (programmable logic controller) is fixedly mounted on the front side of the red light laser metal 3D printer body, and a box door is arranged on the front side of the red light laser metal 3D printer body. A reflecting plate and a forked gas conveying pipe are fixedly installed in the red light laser metal 3D printer body, a transfer hollow ring is fixedly installed at the bottom of the forked gas conveying pipe, and an argon spray head is fixedly installed at the bottom of the transfer hollow ring. According to the gas protection device for red light laser copper alloy 3D printing, by arranging the direction-adjustable argon nozzles which are annularly distributed in the red light laser metal 3D printer body, argon can be introduced, under the control of the PLC, the gas flow angle and speed are controlled, a laser scanning path is followed in real time, the reflectivity is reduced, and the loss of laser energy is reduced; and the gas is effectively protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas protection device technical field, concretely is a kind of gas protection device for red light laser copper alloy 3D printing. BACKGROUND

[0002] In red light laser copper alloy 3D printing, gas protection device is the key component to ensure printing quality, is composed of sealed printing cabin, gas delivery system, monitoring control, usually adopts fully enclosed design, ensures internal inert gas environment stability, utilizes oxygen sensor to monitor the oxygen content in cabin in real time, automatically adjusts gas flow, can avoid copper alloy to be easily reacted with oxygen to generate copper oxide under high temperature, leading to material performance decline, reduces airflow disturbance, ensures that laser energy is uniformly applied to metal powder, avoids splashing or porosity, and inhibits smoke and impurities, improves the surface finish of forming piece.

[0003] In prior art, when preparing large copper alloy components (such as nozzle, radiator) in aerospace field, red light laser metal 3D printer (for example, red light laser metal 3D printer with model number EP-M1250 in prior art) is usually used for 3D printing, copper alloy powder is dried and pretreated, inert gas is filled into the interior of the printer, red light laser metal 3D printing head (for example, red light laser metal 3D printing head with model number S7-1200 in prior art) starts printing, and in the printing process, molten pool is monitored in real time, parameters are adjusted to prevent splashing or incomplete fusion, but in actual use, since copper is a typical good conductor, its free electron density is extremely high, when red light irradiates the surface of copper, free electrons reflect most of light energy through collective oscillation (plasma resonance), high reflectivity easily leads to laser energy loss, gas protection needs to be optimized, so a gas protection device for red light laser copper alloy 3D printing is needed to solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of gas protection device for red light laser copper alloy 3D printing to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of gas protection device for red light laser copper alloy 3D printing, including red light laser metal 3D printer body, the front of the red light laser metal 3D printer body is fixedly installed with PLC controller, the front of the red light laser metal 3D printer body is provided with box door, the top inner side of the red light laser metal 3D printer body is fixedly installed with electrostatic adsorption filter screen, the inside of the red light laser metal 3D printer body is fixedly installed with reflection plate and bifurcation gas pipe, the bottom of the bifurcation gas pipe is fixedly installed with transfer hollow ring, the bottom of the transfer hollow ring is fixedly installed with argon gas nozzle.

[0006] Preferably, the argon gas nozzle is annularly and uniformly distributed at the bottom of the transfer hollow ring, and the argon gas nozzle is controlled to start and stop by a PLC controller.

[0007] Preferably, the inside of the reflection plate is provided with a quartz optical fiber with a core diameter of 50-200 microns, and the outside is provided with a double-layer coating, the inner layer is made of SiO2, and the outer layer is made of a polyimide sheath.

[0008] Preferably, the electrostatic adsorption filter screen has a pore size of ≤10 microns and is internally provided with an ionization module.

[0009] Preferably, the red light laser metal 3D printer body adopts a fully-closed stainless steel cabin body, internally integrates a temperature control layer double-layer jacket structure, and circulates cooling water.

[0010] Preferably, the bifurcated gas delivery pipe is divided into four branches from the main gas delivery pipe, each branch is provided with an independent electromagnetic valve, and the response time is <10 ms.

[0011] Preferably, the transfer hollow ring adopts an annular stainless steel structure, has an outer diameter of 200 mm and a wall thickness of 2 mm, and integrates a gas preheating module and is heated to 80°C by resistance.

[0012] Compared with the prior art, the utility model provides a kind of gas protection device for red light laser copper alloy 3D printing, with the following beneficial effects:

[0013] 1. The gas protection device for red light laser copper alloy 3D printing, by the inside of red light laser metal 3D printer body Setting annularly distributed adjustable argon gas nozzle, can pass into argon, under the control of PLC controller, control airflow angle and speed, real-time follow laser scanning path, reduce reflectivity, reduce the loss of laser energy, effectively protect gas.

[0014] 2. The gas protection device for red light laser copper alloy 3D printing, by setting the reflection plate on the inner wall of the red light laser metal 3D printer body, the unabsorbed laser can be reflected back to the powder bed, which reduces the laser loss and greatly improves the energy utilization. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor:

[0016] Fig. 1The utility model discloses an appearance structure schematic diagram shows that the utility model discloses a kind of appearance structure schematic diagram of section view.

[0017] Fig. 2 The utility model discloses an appearance structure schematic diagram shows that the utility model discloses a kind of appearance structure schematic diagram of section view.

[0018] Fig. 3 The utility model discloses a kind of appearance structure schematic diagram of section view of transfer hollow ring and its connection structure.

[0019] In the figure: 1, red light laser metal 3D printer body;2, PLC controller;3, box door;4, electrostatic adsorption filter screen;5, reflection plate;6, bifurcated gas delivery pipe;7, transfer hollow ring;8, argon gas nozzle. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] In the utility model, unless another explicit provision and limitation, the terms "mount", "connect", "connect", "fix" and other terms should be broad understanding, for example, can be fixed connection, can be detachable connection, or integrated;Can be mechanical connection, can be electrical connection;It can be directly connected, can be indirectly connected through intermediate medium, it can be the communication of two elements or the interaction of two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0022] Please refer to Figs. 1-3 The utility model provides a kind of technical scheme: a kind of gas protection device for red light laser copper alloy 3D printing, including red light laser metal 3D printer body 1, the front of red light laser metal 3D printer body 1 is fixedly installed with PLC controller 2, the front of red light laser metal 3D printer body 1 is provided with box door 3, the inner side of the top of red light laser metal 3D printer body 1 is fixedly installed with electrostatic adsorption filter screen 4, the inside of red light laser metal 3D printer body 1 is fixedly installed with reflection plate 5 and bifurcated gas delivery pipe 6, the bottom of bifurcated gas delivery pipe 6 is fixedly installed with transfer hollow ring 7, the bottom of transfer hollow ring 7 is fixedly installed with argon gas nozzle 8.

[0023] Further, the argon gas nozzles 8 are uniformly distributed in a ring shape at the bottom of the transfer hollow ring 7, and the argon gas nozzles 8 are controlled to start and stop by the PLC controller 2, the airflow angle (±15°) and the speed (5-30 m / s) are controlled by the PLC controller 2, a local low-oxygen environment (oxygen content <30 ppm) is formed, oxidation of copper powder is inhibited, the laser scanning path is followed in real time, the protection range is expanded to a 5mm area around the molten pool, and the oxidation risk is reduced.

[0024] Further, the inside of the reflection plate 5 is provided with a quartz optical fiber with a core diameter of 50-200μm, and the outside is provided with a double-layer coating, the inner layer is made of SiO2, and the outer layer is made of a polyimide sheath, which can reflect the unabsorbed laser (about 90% energy) back to the powder bed, combined with fiber transmission loss compensation (<2%), the overall energy utilization rate is increased to 12%-15%.

[0025] Further, the electrostatic adsorption filter screen 4 has a pore size ≤10μm, and is provided with an ionization module inside, a high-voltage electrostatic field (5 kV) is formed by the ionization module to charge the dust, the adsorption efficiency is increased to >99.9%, and the metal dust is captured

[0026] It should be noted that the inside of the electrostatic adsorption filter screen 4 can be integrated with an RFID chip, and the PLC automatically records the use time and prompts replacement (period 200 hours).

[0027] Further, the red light laser metal 3D printer body 1 adopts a fully enclosed stainless steel cabin, and is integrated with a temperature control layer double-layer jacket structure inside, and circulating cooling water is introduced.

[0028] It should be noted that the red light laser metal 3D printer body 1 is connected with a vacuum pump and a molecular sieve adsorption tower at the bottom, oxygen impurities (residual oxygen concentration ≤50ppm) are removed, and the purified gas is returned to the gas supply system.

[0029] Further, the bifurcated gas supply pipe 6 is divided into four branches by the main gas supply pipe, the inner diameter is 20mm, each branch is provided with an independent electromagnetic valve, the response time is <10ms, the branch flow (20-100 L / min) is dynamically adjusted according to the printing area, and the argon purity is ≥99.999%.

[0030] Further, the transfer hollow ring 7 adopts a ring-shaped stainless steel structure, the outer diameter is 200mm, the wall thickness is 2mm, a gas preheating module is integrated, the resistance is heated to 80°C, and gas condensation and powder agglomeration are prevented.

[0031] In actual operation, when the device is used, by setting the adjustable argon gas nozzle 8 in a ring distribution inside the red light laser metal 3D printer body 1, argon gas can be introduced, under the control of the PLC controller 2, the gas flow angle and speed are controlled, the scanning path of the laser is followed in real time, the reflectivity is reduced, the loss of laser energy is reduced, the gas is effectively protected, by setting the reflecting plate 5 on the inner wall of the red light laser metal 3D printer body 1, the unabsorbed laser can be reflected back to the powder bed, while reducing the laser loss, the energy utilization rate is greatly improved, by setting the electrostatic adsorption filter screen 4, the dust can be effectively adsorbed by electrostatic adsorption, at the same time, by setting the resistance inside the transfer hollow ring 7, the gas condensation and powder caking can be placed.

[0032] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

Claims

1. A gas protection device for red light laser copper alloy 3D printing, comprising a red light laser metal 3D printer body (1), characterized in that: The front of the red light laser metal 3D printer body (1) is fixedly installed with a PLC controller (2), the front of the red light laser metal 3D printer body (1) is provided with a box door (3), the top inner side of the red light laser metal 3D printer body (1) is fixedly installed with an electrostatic adsorption filter screen (4), the inside of the red light laser metal 3D printer body (1) is fixedly installed with a reflecting plate (5) and a bifurcated gas conveying pipe (6), the bottom of the bifurcated gas conveying pipe (6) is fixedly installed with a transfer hollow ring (7), the bottom of the transfer hollow ring (7) is fixedly installed with an argon gas nozzle (8).

2. The gas protection device for red laser copper alloy 3D printing according to claim 1, characterized in that: The argon gas nozzle (8) is uniformly distributed in the bottom of the transfer hollow ring (7) in a ring shape, and the argon gas nozzle (8) is controlled to start and stop by the PLC controller (2). 3.The gas protection device for red laser copper alloy 3D printing of claim 1, wherein: The reflecting plate (5) is provided with a quartz optical fiber inside, the core diameter is 50-200 μm, and the outside is provided with a double-layer coating, the inner layer is made of SiO2, and the outer layer is made of a polyimide sheath.

4. The gas protection device for red laser copper alloy 3D printing according to claim 1, characterized in that: The electrostatic adsorption filter screen (4) is provided with an ionization module inside and the aperture is ≤10 μm. 5.The gas protection device for red laser copper alloy 3D printing of claim 1, wherein: The red light laser metal 3D printer body (1) adopts a fully-closed stainless steel cabin body, and a temperature control layer double-layer jacket structure is integrated inside, and circulating cooling water is introduced. 6.The gas protection device for red laser copper alloy 3D printing of claim 1, wherein: The bifurcated gas conveying pipe (6) is divided into a main gas conveying pipe bifurcated into four branches, the inner diameter is 20 mm, each branch is provided with an independent electromagnetic valve, and the response time is <10 ms. 7.The gas protection device for red laser copper alloy 3D printing of claim 1, wherein: The transfer hollow ring (7) adopts a ring-shaped stainless steel structure, the outer diameter is 200 mm, the wall thickness is 2 mm, a gas preheating module is integrated, and the resistance is heated to 80°C.

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