Part strengthening and toughening additive manufacturing equipment based on atmosphere reaction

Abstract

The utility model discloses part strengthening and toughening additive manufacturing equipment based on atmosphere reaction. The equipment comprises an optical system, a forming system and an atmosphere reaction cavity. The optical system is fixedly arranged at the top of the forming system, and the atmosphere reaction chamber is arranged in the forming system; the atmosphere reaction chamber specifically comprises a chamber wall, a reaction atmosphere gas inlet, a reaction atmosphere gas outlet, a sealing gas curtain gas outlet, a sealing gas curtain gas inlet and a reaction atmosphere concentration sensor; the forming system specifically comprises a forming cavity, a forming cylinder, a feeding cylinder, a powder laying mechanism and a reaction cavity moving mechanism. The atmosphere reaction chamber is introduced in the additive manufacturing process, reinforcement phases with different volume fractions are generated in situ according to the concentration of the reaction atmosphere, and the toughness of other parts is not affected while local reinforcement of the part is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of additive manufacturing, and particularly relates to an additive manufacturing device for strengthening and toughening parts based on atmosphere reaction. Background Art

[0002] Metal additive manufacturing technology has broad application prospects because it can achieve rapid forming and efficient production of complex structures. However, there are still certain challenges in improving the strength and toughness of parts in existing additive manufacturing technologies. By introducing in-situ atmosphere reaction during the additive manufacturing process, the strength of parts can be enhanced, but this method is limited by the flexibility of atmosphere conversion in the forming cavity and it is difficult to achieve local strengthening of parts. Moreover, although this overall strengthening of parts can improve their strength, it will also significantly reduce the plasticity of parts, making it difficult to meet the requirements of complex parts in terms of high strength and high toughness simultaneously. Summary of the Utility Model

[0003] The main purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art, and provide an additive manufacturing device for strengthening and toughening parts based on atmosphere reaction. By introducing an atmosphere reaction chamber during the additive manufacturing process, reinforcing phases with different volume fractions are in-situ generated by the concentration of the reaction atmosphere, achieving local strengthening of parts without affecting the toughness of other parts.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An additive manufacturing device for strengthening and toughening parts based on atmosphere reaction includes an optical system, a forming system, and an atmosphere reaction chamber; the optical system is fixedly arranged on the top of the forming system, and the atmosphere reaction chamber is arranged inside the forming system.

[0006] Further, the forming system specifically includes a forming chamber, a forming cylinder, a feeding cylinder, a powder spreading mechanism, and a reaction chamber moving mechanism;

[0007] The forming cylinder and the feeding cylinder are arranged at the bottom of the forming chamber; the powder spreading mechanism is arranged on one side inside the forming chamber, and the reaction chamber moving mechanism is arranged on the other side inside the forming chamber.

[0008] Further, the atmosphere reaction chamber specifically includes a chamber wall, a reaction atmosphere inlet, a reaction atmosphere outlet, a sealing air curtain outlet, a sealing air curtain inlet, and a reaction atmosphere concentration sensor;

[0009] The reaction atmosphere inlet is arranged on the chamber wall through bolts, and the reaction atmosphere outlet is arranged on the chamber wall opposite to the reaction atmosphere inlet through bolts;

[0010] The sealing air curtain inlet is installed on the chamber wall by bolts, and the sealing air curtain inlet is arranged above the reaction atmosphere inlet; the sealing air curtain outlet is installed on the opposite chamber wall of the sealing air curtain inlet by bolts, and the sealing air curtain outlet is arranged above the reaction atmosphere outlet;

[0011] The reaction atmosphere concentration sensor is fixedly installed on the chamber wall;

[0012] There is no obstruction at the top of the atmosphere reaction chamber.

[0013] Further, the reaction chamber moving mechanism includes an X-axis moving mechanism and a Y-axis moving mechanism;

[0014] The atmosphere reaction chamber is connected to the Y-axis moving mechanism, the Y-axis moving mechanism is connected to the X-axis moving mechanism, and the X-axis moving mechanism is arranged on the forming chamber wall surface.

[0015] Further, the X-axis moving mechanism specifically includes an X-axis linear guide rail, an X-axis lead screw, an X-axis driving motor, and an X-axis slide table; the X-axis lead screw is installed in the X-axis linear guide rail, the X-axis slide table is matched with the X-axis lead screw, and the X-axis driving motor makes the X-axis slide table move along the X-axis linear guide rail through the X-axis lead screw.

[0016] Further, the Y-axis moving mechanism specifically includes a Y-axis linear guide rail, a Y-axis lead screw, a Y-axis driving motor, and a Y-axis slide table;

[0017] The Y-axis lead screw is installed in the Y-axis linear guide rail, the Y-axis slide table is matched with the Y-axis lead screw, and the Y-axis driving motor makes the Y-axis slide table move along the Y-axis linear guide rail through the Y-axis lead screw;

[0018] The X-axis moving mechanism is arranged on the forming chamber wall surface, the Y-axis moving mechanism is connected to the X-axis moving mechanism through the X-axis slide table, the atmosphere reaction chamber is connected to the Y-axis slide table, and the cooperation of the X-axis moving mechanism and the Y-axis moving mechanism realizes the movement of the atmosphere reaction chamber in the X and Y axis directions.

[0019] Further, it also includes a frame, and the forming system is fixedly installed on the frame.

[0020] Further, the optical system specifically includes a laser, a galvanometer scanner, a field lens, a protective mirror, and an optical mounting plate;

[0021] The optical mounting plate is arranged on the upper wall of the forming chamber, the galvanometer scanner is fixedly installed on the optical mounting plate, the field lens is arranged below the galvanometer scanner, the protective mirror is arranged on the upper wall of the forming chamber, and the laser is fixedly installed on the frame.

[0022] Further, the side wall of the forming chamber is provided with a protective gas inlet and a protective gas outlet for the delivery and discharge of the protective gas in the forming chamber; the upper wall of the forming chamber is provided with an optical path incident port for installing the protective mirror of the optical system and as a laser incident channel.

[0023] Furthermore, the powder spreading mechanism specifically includes a guide rail, a lead screw, a driving motor, a linear slide, and a powder spreading blade.

[0024] The guide rail is arranged on the bottom surface of the forming chamber. The lead screw is installed in the guide rail. The linear slide is matched with the lead screw. The powder spreading blade is fixedly arranged on the linear slide. The driving motor drives the powder spreading blade fixed on the linear slide to spread powder along the guide rail.

[0025] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0026] 1. Achieve local strengthening while maintaining the toughness of the part matrix, and improve the overall performance: By introducing an atmosphere reaction chamber during the additive manufacturing process, the utility model can generate reinforcing phases with different volume fractions in specific areas of the part, improve the local strength of the part, and avoid the deficiency that the traditional overall atmosphere field can only strengthen the part as a whole and significantly reduce plasticity.

[0027] 2. Reduce the consumption of reaction gas and the ventilation time required for atmosphere reaction strengthening: The small and movable atmosphere reaction chamber provides the required atmosphere environment for the gas-liquid chemical reaction in the molten pool, avoiding the deficiency that the existing atmosphere reaction needs to fill the entire forming chamber with a specific concentration of reaction atmosphere, reducing the gas consumption of reaction gas and protective gas during the ventilation and gas washing processes, saving the ventilation time, and improving the production efficiency.

[0028] 3. The generation amount and generation position of the reinforcing phase are controllable: By controlling the position of the atmosphere reaction chamber on the part and the concentration of the reaction atmosphere, customized preparation of the generation amount and generation position of the reinforcing phase can be achieved. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the equipment of the utility model;

[0030] Figure 2 is a schematic structural diagram of the forming system;

[0031] Figure 3 is a schematic structural diagram of the atmosphere reaction chamber;

[0032] Explanation of the reference numerals in the drawings: 1 - optical system; 2 - forming system; 3 - atmosphere reaction chamber; 21 - forming chamber; 211 - protective gas inlet; 212 - protective gas outlet; 22 - forming cylinder; 23 - feeding cylinder; 24 - powder spreading mechanism; 25 - reaction chamber moving mechanism; 251 - X-axis moving mechanism; 252 - Y-axis moving mechanism; 31 - chamber wall; 32 - reaction atmosphere inlet; 33 - reaction atmosphere outlet; 34 - sealing air curtain outlet; 35 - sealing air curtain inlet; 36 - reaction atmosphere concentration sensor. Detailed Embodiments

[0033] The present utility model will be further described in detail below in conjunction with embodiments and the accompanying drawings. However, the implementation manners of the present utility model are not limited thereto.

[0034] Embodiment

[0035] As Figure 1 and Figure 2 shown, the present utility model is a part strengthening and toughening additive manufacturing device based on atmosphere reaction, including an optical system 1, a forming system 2, an atmosphere reaction chamber 3 and a frame; the optical system is fixedly arranged on the top of the forming system, the atmosphere reaction chamber is arranged inside the forming system, and the forming system is fixedly arranged on the frame.

[0036] The optical system is used to provide energy during the forming process, and the atmosphere reaction chamber provides an atmosphere environment for the atmosphere reaction process.

[0037] In this embodiment, the forming system specifically includes a forming chamber 21, a forming cylinder 22, a feeding cylinder 23, a powder spreading mechanism 24 and a reaction chamber moving mechanism 25;

[0038] The forming cylinder is used to control the lifting of the part during the forming process, so that the forming plane is consistent with the focal plane of the optical system;

[0039] The feeding cylinder is used for the supply of powder during the forming process;

[0040] The powder spreading mechanism is used to spread the powder in the feeding cylinder onto the forming plane and keep the powder bed flat;

[0041] The reaction chamber moving mechanism is used to control the movement of the atmosphere reaction chamber in the forming chamber.

[0042] The forming cylinder and the feeding cylinder are arranged at the bottom of the forming chamber; the powder spreading mechanism is arranged on one side inside the forming chamber, and the reaction chamber moving mechanism is arranged on the other side inside the forming chamber.

[0043] In this embodiment, the reaction chamber moving mechanism includes an X-axis moving mechanism 251 and a Y-axis moving mechanism 252;

[0044] In this embodiment, the X-axis moving mechanism specifically includes an X-axis linear guide rail, an X-axis lead screw, an X-axis driving motor and an X-axis slide; the X-axis lead screw is installed in the X-axis linear guide rail, the X-axis slide is matched with the X-axis lead screw, and the X-axis driving motor makes the X-axis slide move along the X-axis linear guide rail through the X-axis lead screw.

[0045] The Y-axis moving mechanism specifically includes a Y-axis linear guide rail, a Y-axis lead screw, a Y-axis driving motor and a Y-axis slide; the Y-axis lead screw is installed in the Y-axis linear guide rail, the Y-axis slide is matched with the Y-axis lead screw, and the Y-axis driving motor makes the Y-axis slide move along the Y-axis linear guide rail through the Y-axis lead screw.

[0046] The X-axis moving mechanism is arranged on the wall surface of the forming chamber. The Y-axis moving mechanism is connected to the X-axis moving mechanism through the X-axis slide. The atmosphere reaction chamber is connected to the Y-axis slide. The cooperation of the X-axis moving mechanism and the Y-axis moving mechanism realizes the movement of the atmosphere reaction chamber in the X and Y axis directions.

[0047] In this embodiment, the optical system specifically includes a laser, a galvanometer scanner, a field lens, a protective mirror, and an optical mounting plate.

[0048] The optical mounting plate is arranged on the upper wall of the forming chamber. The galvanometer scanner is fixedly arranged on the optical mounting plate. The field lens is arranged below the galvanometer scanner. The protective mirror is arranged on the upper wall of the forming chamber. The laser is fixedly arranged on the frame.

[0049] In this embodiment, a protective gas inlet 211 and a protective gas outlet 212 are provided on the side wall of the forming chamber for the transportation and discharge of the protective gas in the forming chamber. An optical path incident port is provided on the upper wall of the forming chamber for installing the protective mirror of the optical system and serving as a laser incident channel.

[0050] As Figure 3 shown, in this embodiment, the atmosphere reaction chamber specifically includes a chamber wall 31, a reaction atmosphere inlet 32, a reaction atmosphere outlet 33, a sealing air curtain outlet 34, a sealing air curtain inlet 35, and a reaction atmosphere concentration sensor 36.

[0051] The reaction atmosphere inlet is arranged on the chamber wall through bolts. The reaction atmosphere outlet is arranged on the opposite chamber wall of the reaction atmosphere inlet through bolts.

[0052] The sealing air curtain inlet is arranged on the chamber wall through bolts. The sealing air curtain inlet is arranged above the reaction atmosphere inlet. The sealing air curtain outlet is arranged on the opposite chamber wall of the sealing air curtain inlet through bolts. The sealing air curtain outlet is arranged above the reaction atmosphere outlet.

[0053] The reaction atmosphere inlet is used to transport reaction gases that can undergo in-situ chemical reactions with the forming powder at high temperatures to the atmosphere reaction chamber.

[0054] The reaction atmosphere outlet is used to provide suction to make the reaction gases flow in a specific gas flow direction (from the reaction atmosphere inlet to the reaction atmosphere outlet direction), reducing the overflow of reaction gases.

[0055] The sealing air curtain inlet sprays inert protective gas at the top of the atmosphere reaction chamber. It cooperates with the sealing air curtain outlet to form an inert protective air curtain to prevent the reaction gases from overflowing from the atmosphere reaction chamber. The sum of the flow rates of the reaction atmosphere outlet and the sealing air curtain outlet is greater than the sum of the flow rates of the reaction atmosphere inlet and the sealing air curtain inlet, creating a negative pressure in the atmosphere reaction chamber to further prevent the reaction gases from overflowing.

[0056] The reaction atmosphere concentration sensor is fixedly installed on the chamber wall. The reaction atmosphere concentration sensor is used to monitor the reaction atmosphere concentration in the atmosphere reaction chamber, and adjust the intake air volume of the reaction atmosphere inlet accordingly to control and adjust the reaction atmosphere concentration in the atmosphere reaction chamber.

[0057] The top of the atmosphere reaction chamber is unobstructed, allowing the forming light source to enter the powder bed below the reaction atmosphere chamber to provide the energy required for forming and atmosphere reaction.

[0058] In this embodiment, the powder spreading mechanism specifically includes a guide rail, a lead screw, a driving motor, a linear slide, and a powder spreading blade;

[0059] The guide rail is arranged on the bottom surface of the forming chamber. The lead screw is installed in the guide rail. The linear slide is matched with the lead screw. The powder spreading blade is fixedly arranged on the linear slide. The driving motor drives the powder spreading blade fixed on the linear slide to spread powder along the guide rail through the lead screw.

[0060] This embodiment can also be connected to a host computer for automatically controlling the movement of the atmosphere reaction chamber and the reaction atmosphere concentration in the atmosphere reaction chamber.

[0061] The working method of this embodiment includes the following steps:

[0062] S1. Open the protective gas inlet and the protective gas outlet on the side wall of the forming chamber, and introduce the inert protective gas argon into the forming chamber through the protective gas inlet to fill the forming chamber with argon;

[0063] S2. The optical system performs selective melting on the titanium-containing material in the forming cylinder according to the slice file information to form a part substrate;

[0064] S3. The reaction chamber moving mechanism moves the atmosphere reaction chamber above the area where the part needs to be strengthened according to the slice file information;

[0065] S4. The reaction atmosphere inlet, the reaction atmosphere outlet, the sealing air curtain outlet, and the sealing air curtain inlet are controlled to open, so that nitrogen with a concentration of 5%-20% is maintained in the atmosphere reaction chamber;

[0066] S5. The optical system performs selective melting on the area where the part needs to be strengthened according to the slice file information, so that it undergoes a gas-liquid chemical reaction at high temperature to in-situ generate TiN particle strengthening phases and achieve local strengthening of the part;

[0067] S6. The reaction chamber moving mechanism moves the atmosphere reaction chamber out of the forming plane;

[0068] S7. The powder spreading mechanism spreads a new layer of powder onto the forming plane;

[0069] S8. Repeat steps S2 to S7 until the entire part is manufactured.

[0070] It should also be noted that in this specification, terms such as "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An additive manufacturing device for strengthening and toughening parts based on atmosphere reaction, characterized in that, It includes an optical system, a shaping system, and an atmosphere reaction chamber; the optical system is fixedly arranged on the top of the shaping system, and the atmosphere reaction chamber is arranged inside the shaping system.

2. The parts strengthening and toughening additive manufacturing equipment based on atmosphere reaction according to claim 1, characterized in that, The shaping system specifically includes a shaping chamber, a shaping cylinder, a feeding cylinder, a powder spreading mechanism, and a reaction chamber moving mechanism; The shaping cylinder and the feeding cylinder are arranged at the bottom of the shaping chamber; the powder spreading mechanism is arranged on one side inside the shaping chamber, and the reaction chamber moving mechanism is arranged on the other side inside the shaping chamber.

3. The parts strengthening and toughening additive manufacturing equipment based on atmosphere reaction according to claim 1, characterized in that, The atmosphere reaction chamber specifically includes a chamber wall, a reaction atmosphere inlet, a reaction atmosphere outlet, a sealing air curtain outlet, a sealing air curtain inlet, and a reaction atmosphere concentration sensor; The reaction atmosphere inlet is arranged on the chamber wall through bolts, and the reaction atmosphere outlet is arranged on the opposite chamber wall of the reaction atmosphere inlet through bolts; The sealing air curtain inlet is arranged on the chamber wall through bolts, and the sealing air curtain inlet is arranged above the reaction atmosphere inlet; the sealing air curtain outlet is arranged on the opposite chamber wall of the sealing air curtain inlet through bolts, and the sealing air curtain outlet is arranged above the reaction atmosphere outlet; The reaction atmosphere concentration sensor is fixedly arranged on the chamber wall; There is no obstruction at the top of the atmosphere reaction chamber.

4. The parts strengthening and toughening additive manufacturing equipment based on atmosphere reaction according to claim 2, characterized in that, The reaction chamber moving mechanism includes an X-axis moving mechanism and a Y-axis moving mechanism; The atmosphere reaction chamber is connected to the Y-axis moving mechanism, the Y-axis moving mechanism is connected to the X-axis moving mechanism, and the X-axis moving mechanism is arranged on the wall surface of the shaping chamber.

5. The parts strengthening and toughening additive manufacturing equipment based on atmosphere reaction according to claim 4, characterized in that, The X-axis moving mechanism specifically includes an X-axis linear guide rail, an X-axis lead screw, an X-axis driving motor, and an X-axis slide table; the X-axis lead screw is installed in the X-axis linear guide rail, the X-axis slide table is matched with the X-axis lead screw, and the X-axis driving motor makes the X-axis slide table move along the X-axis linear guide rail through the X-axis lead screw.

6. The additive manufacturing equipment for strengthening and toughening parts based on atmosphere reaction according to claim 5, characterized in that, The Y-axis moving mechanism specifically includes a Y-axis linear guide rail, a Y-axis lead screw, a Y-axis driving motor, and a Y-axis slide table; The Y-axis lead screw is installed in the Y-axis linear guide rail, the Y-axis slide table is matched with the Y-axis lead screw, and the Y-axis driving motor makes the Y-axis slide table move along the Y-axis linear guide rail through the Y-axis lead screw; The X-axis moving mechanism is arranged on the wall surface of the shaping chamber, the Y-axis moving mechanism is connected to the X-axis moving mechanism through the X-axis slide table, the atmosphere reaction chamber is connected to the Y-axis slide table, and the movement of the atmosphere reaction chamber in the X and Y axis directions is realized through the cooperation of the X-axis moving mechanism and the Y-axis moving mechanism.

7. The additive manufacturing equipment for strengthening and toughening parts based on atmosphere reaction according to claim 2, wherein It further includes a frame, and the shaping system is fixedly arranged on the frame.

8. The additive manufacturing equipment for strengthening and toughening parts based on atmosphere reaction according to claim 7, wherein, The optical system specifically includes a laser, a galvanometer scanner, a field lens, a protective mirror, and an optical mounting plate; The optical mounting plate is arranged on the upper wall of the shaping chamber, the galvanometer scanner is fixedly arranged on the optical mounting plate, the field lens is arranged below the galvanometer scanner, the protective mirror is arranged on the upper wall of the shaping chamber, and the laser is fixedly arranged on the frame.

9. The parts strengthening and toughening additive manufacturing equipment based on atmosphere reaction according to claim 8, characterized in that, The side wall of the shaping chamber is provided with a protective gas inlet and a protective gas outlet for the transportation and discharge of the protective gas inside the shaping chamber; the upper wall of the shaping chamber is provided with an optical path incident port for installing the protective mirror of the optical system and serving as a laser incident channel.

10. The additive manufacturing equipment for strengthening and toughening parts based on atmosphere reaction according to claim 2, wherein, The powder spreading mechanism specifically includes a guide rail, a lead screw, a driving motor, a linear slide table, and a powder spreading blade; The guide rail is arranged on the bottom surface of the shaping chamber, the lead screw is installed in the guide rail, the linear slide table is matched with the lead screw, the powder spreading blade is fixedly arranged on the linear slide table, and the driving motor drives the powder spreading blade fixed on the linear slide table to spread powder along the guide rail through the lead screw.

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