阅读说明：本技术 一种激光/电弧熔丝增材制造过程中气体保护装置及方法 (Gas protection device and method in laser/arc fuse additive manufacturing process ) 是由 方学伟 耿永亮 黄科 任传奇 蒋笑 李战鑫 李帛阳 段玉岗 卢秉恒 于 2020-12-22 设计创作，主要内容包括：本发明公开了一种激光/电弧熔丝增材制造过程中气体保护装置及方法,本发明的装置利用十字滑轨和升降台的配合,保证了X、Y、Z三个方向的自由调节,尺寸规格不易受到限制,可根据工件大小而定。利用柔性结构保证了惰性气体的纯度,并在合适的位置设置观察结构,对增材制造过程的质量进行有效监控。本发明的应用场景为钛合金、镁合金等气体敏感性材质的电弧/激光为热源的熔丝增材制造过程,其应用不局限与激光/电弧增材过程,可拓展应用在需要快速气氛防护的应用领域和场景。(The invention discloses a gas protection device and a gas protection method in a laser/arc fuse additive manufacturing process, wherein the device ensures free adjustment in X, Y, Z three directions by utilizing the matching of a cross slide rail and a lifting table, and the size specification is not easy to be limited and can be determined according to the size of a workpiece. The purity of inert gas is guaranteed by utilizing the flexible structure, and the observation structure is arranged at a proper position, so that the quality of the additive manufacturing process is effectively monitored. The application scene of the invention is a fuse wire additive manufacturing process taking the electric arc/laser of gas sensitive materials such as titanium alloy, magnesium alloy and the like as a heat source, the application is not limited to a laser/electric arc additive manufacturing process, and the application can be expanded in the application field and scene needing rapid atmosphere protection.)

1. A gas protection device in a laser/electric arc fuse wire additive manufacturing process is characterized by comprising a welding gun (1) and a box body (8), wherein a lifting table (7) is arranged in the box body (8), the lifting table (7) is used for placing a workpiece (6), a cross slide rail (3) is arranged at the top of the box body (8), a transparent flame retardant plate (4) is arranged on the cross slide rail (3), the surface area of the transparent flame retardant plate (4) is larger than that of the box body (8), the transparent flame retardant plate (4) is sealed with the box body (8), after the lifting table (7) is lifted, a workpiece (6) is arranged below the transparent flame-retardant plate (4), a welding gun (1) penetrates through the transparent flame-retardant plate (4) and stretches into the position below the transparent flame-retardant plate (4), a flexible sleeve (2) is sleeved on the welding gun (1), and the flexible sleeve (2) is in contact with the transparent flame-retardant plate (4) to seal the welding gun (1) and the transparent flame-retardant plate (4).

2. The gas protection device in the laser/arc fuse additive manufacturing process according to claim 1, wherein a felt (5) is arranged between the box body (8) and the transparent flame-retardant plate (4).

3. The gas protection device in the additive manufacturing process of the laser/arc fuse as claimed in claim 1, wherein the box body (8) is provided with a detection port (11).

4. The gas protection device in the laser/arc fuse additive manufacturing process according to claim 1, wherein the cross slide rail (3) comprises two sets of transverse free slide rails (3-1) and longitudinal free slide blocks (3-2), and the transverse free slide rails (3-1) and the longitudinal free slide blocks (3-2) are arranged in a crossing manner.

5. The gas protection device in the laser/arc fuse additive manufacturing process according to claim 1, wherein a box door (10) is opened on the box body (8).

6. The gas protection device for laser/arc fuse additive manufacturing process according to claim 5, wherein the box door (10) is made of transparent material.

7. The gas protection device in the additive manufacturing process of the laser/arc fuse as claimed in claim 1, wherein the tank (8) is provided with a gas filling port (9).

8. The method of using a gas shield in a laser/arc fuse additive manufacturing process of claim 1, comprising the steps of:

s1, placing the workpiece (6) on the lifting platform (7), and lifting the workpiece (6) to a required height through the lifting platform (7);

s2, introducing inert gas into the box body (8) and keeping the concentration of the inert gas in the box body (8);

s3, start welder (1) and carry out material increase manufacturing, transparent fire-retardant board (4) are at the drive of welder (1) down on cross slide rail (3) along X direction and Y direction free slip, and can form effective sealed to box (8) all the time, can increase on the Z direction of material increase in-process work piece (6) and welder (1), in certain extent, welder (1) freely stretches out and draws back in the within range of flexible cover (2), but after the increase along with Z direction height is too high, through reducing elevating platform (7) height, realize the free regulation of Z direction.

9. The method for using the gas protection device in the laser/arc fuse additive manufacturing process according to claim 8, wherein in step S2, when the inert gas is introduced into the box body (8), the content of the inert gas in the box body (8) is measured by using the detection port (11), and when the inert gas in the box body (8) reaches the required concentration, the flow rate of the introduced inert gas is reduced to maintain the concentration of the inert gas in the box body (8).

10. The use method of the gas protection device in the laser/arc fuse additive manufacturing process according to claim 8, wherein the box body (8) effectively prevents the external air and the inert gas from forming convection current to enter the box body (8) during the movement of the welding gun (1) through the felt (5), and an effective gas blocking effect is formed due to the fact that the inert gas is always introduced.

Technical Field

The invention belongs to the field of titanium alloy/magnesium alloy laser/electric arc additive manufacturing (3D printing), and particularly relates to a gas protection device and method in a laser/electric arc fuse additive manufacturing process.

Background

Materials sensitive to oxygen and nitrogen at high temperature such as traditional titanium alloy, magnesium alloy and the like need effective protection of inert gas when manufactured in an additive mode, and the titanium alloy forming process commonly used at present is as follows: overall protection and local protection.

The integral protection refers to manufacturing an integral inert gas protection chamber under normal conditions, and coating additive equipment and workpieces in the protection chamber, however, the protection chamber has a large volume and high manufacturing cost, and the inflation replacement time is long, so that the preparation work before the titanium alloy is formed can be up to tens of hours, the long preparation time greatly consumes manpower and material resources, and in addition, the part specification limitation is very easy, so that the requirement on manufacturing of medium and large-sized products is difficult to meet.

The local protection is that a specially designed device is additionally arranged at key positions of a welding gun, a workpiece and the like, inert protective gas is introduced, and atmosphere protection of the forming local position is guaranteed. The atmosphere protection system and the laser additive manufacturing equipment 201610900252.9 for laser additive manufacturing, the aluminum alloy arc additive flexible gas protection device and the method 201810088125.2, the gas protection device 201910711047.1 for titanium alloy arc fuse additive manufacturing, the atmosphere protection equipment 202010430553.6 for titanium alloy arc fuse additive manufacturing and the like all refer to related local gas protection devices, but the moving space is obviously limited when large-size parts are manufactured by laser/arc fuse additive manufacturing, and the available space in an atmosphere box is obviously limited. In addition, in the technology of aluminum alloy arc additive flexible gas protection device and method 201810088125.2, the additive of large-size workpieces is difficult to realize only by virtue of flexible connection, and the flexible transition sleeve can cause convection of gas in the moving process and possibly cause pollution risk to a molten pool.

At present, the additive manufacturing of titanium alloy powder metal is mature, but no special rapid atmosphere protection system exists for the additive manufacturing of titanium alloy/magnesium alloy laser and arc fuse.

Disclosure of Invention

The invention aims to overcome the defects and provides a gas protection device and a gas protection method in the additive manufacturing process of a laser/arc fuse, which can greatly reduce the preparation time before forming, greatly improve the utilization space of an atmosphere chamber and effectively promote the application and development of titanium alloy and magnesium alloy in the additive manufacturing field.

In order to achieve the purpose, the gas protection device in the laser/arc fuse additive manufacturing process comprises a welding gun and a box body, wherein a lifting platform is arranged in the box body, the lifting platform is used for placing a workpiece, a cross slide rail is arranged at the top of the box body, a transparent flame-retardant plate is arranged on the cross slide rail, the surface area of the transparent flame-retardant plate is larger than that of the box body, the transparent flame-retardant plate is sealed with the box body, after the lifting platform is lifted, the workpiece is arranged below the transparent flame-retardant plate, the welding gun penetrates through the transparent flame-retardant plate and extends into the lower portion of the transparent flame-retardant plate, a flexible sleeve is sleeved on the welding gun and is in.

And a felt is arranged between the box body and the transparent flame-retardant plate.

The box body is provided with a detection port.

The cross slide rail comprises two sets of transverse free slide rails and longitudinal free slide blocks, and the transverse free slide rails and the longitudinal free slide blocks are arranged in a crossed mode.

The box body is provided with a box door.

The box door is made of transparent materials.

An inflation inlet is arranged on the box body.

A method of using a gas shield apparatus in a laser/arc fuse additive manufacturing process, comprising the steps of:

s1, placing the workpiece on a lifting platform, and lifting the workpiece to a required height through the lifting platform;

s2, introducing inert gas into the box body, and keeping the concentration of the inert gas in the box body;

s3, starting a welding gun to perform additive manufacturing, enabling a transparent flame-retardant plate to freely slide on a cross slide rail along the X direction and the Y direction under the driving of the welding gun, and always forming effective sealing for a box body, wherein the Z directions of workpieces and the welding gun can be increased in the additive process, and in a certain range, the welding gun freely stretches out and draws back in the range of a flexible sleeve, but after the height of the Z direction is too high, the height of a lifting platform is reduced, and the free adjustment of the Z direction is realized.

And S2, when the inert gas is introduced into the box body, measuring the content of the inert gas in the box body by using the detection port, and reducing the flow of the introduced inert gas and maintaining the concentration of the inert gas in the box body after the inert gas in the box body reaches the required concentration.

The box effectively prevents the outside air and the inert gas from forming convection current and entering the box in the movement process of the welding gun through the felt, and an effective gas blocking effect is formed due to the fact that the inert gas is introduced all the time.

Compared with the prior art, the device ensures free adjustment of X, Y, Z in three directions by utilizing the matching of the cross slide rail and the lifting platform, and the size specification is not easy to be limited and can be determined according to the size of a workpiece. The purity of inert gas is guaranteed by utilizing the flexible structure, and the observation structure is arranged at a proper position, so that the quality of the additive manufacturing process is effectively monitored. The application scene of the invention is a fuse wire additive manufacturing process taking the electric arc/laser of gas sensitive materials such as titanium alloy, magnesium alloy and the like as a heat source, the application is not limited to a laser/electric arc additive manufacturing process, and the application can be expanded in the application field and scene needing rapid atmosphere protection.

The method adopts a local gas-filled protection mode to realize gas protection of medium and large-sized components in the fuse wire additive manufacturing process, replaces an integral inert gas protection chamber structure, greatly shortens the preparation time before forming the magnesium alloy/titanium alloy, greatly improves the working efficiency of equipment, reduces the manufacturing cost of titanium alloy parts, shortens the production period and improves the socialized benefit.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of the working state of the present invention;

the device comprises a welding gun 1, a welding gun 2, a flexible sleeve 3, a cross slide rail 4, a transparent flame-retardant plate 5, a felt 6, a workpiece 7, a lifting table 8, a box body 9, an inflation inlet 10, a box door 11, a detection port 3-1, a transverse free slide rail 3-2 and a longitudinal free slide rail.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1, a gas protection device in a laser/arc fuse additive manufacturing process comprises a welding gun 1 and a box body 8, wherein an elevating platform 7 is arranged in the box body 8, the elevating platform 7 is used for placing a workpiece 6, a cross slide rail 3 is arranged at the top of the box body 8, a transparent flame retardant plate 4 is arranged on the cross slide rail 3, the surface area of the transparent flame retardant plate 4 is larger than that of the box body 8, the transparent flame retardant plate 4 always covers the upper part of the box body 8 in an enough sliding space, the transparent flame retardant plate 4 is sealed with the box body 8, the workpiece 6 is arranged below the transparent flame retardant plate 4 after the elevating platform 7 is lifted, the welding gun 1 penetrates through the transparent flame retardant plate 4 and extends into the lower part of the transparent flame retardant plate 4, a flexible sleeve 2 is sleeved on the welding gun 1, the flexible sleeve 2 is in contact with the transparent flame retardant plate 4, so that the welding gun 1 is sealed, A small movement is required while forming a hermetic connection. A felt 5 is arranged between the box body 8 and the transparent flame-retardant plate 4. The box body 8 is provided with a detection port 11. The cross slide rail 3 comprises two sets of transverse free slide rails 3-1 and longitudinal free slide blocks 3-2, and the transverse free slide rails 3-1 and the longitudinal free slide blocks 3-2 are arranged in a crossed mode. The box body 8 is provided with a box door 10. The door 10 is made of transparent material. The box body 8 is provided with an inflation inlet 9.

The workpiece 6 is placed above the lifting platform 7 through the box door 10, material increase can be directly performed within a certain range, but after the height of the workpiece 6 is too high, the height of the lifting platform 7 can be reduced, and the welding gun 1 is guaranteed to be always in a proper working height range, so that the adjustment of the degree of freedom in the Z direction is realized. The box door 10 is made of transparent high-temperature-resistant observation glass material, and can observe and check the high direction in the material increase process.

A method of using a gas shield apparatus in a laser/arc fuse additive manufacturing process, comprising the steps of:

s1, placing the workpiece 6 on the lifting table 7, and lifting the workpiece 6 to a desired height by the lifting table 7;

s2, closing the box door 10, introducing inert gas such as argon into the box body 8, measuring the content of the inert gas in the box body 8 by using the detection port 11, wherein the sufficient concentration can be achieved within 10-20min usually, and when the inert gas in the box body 8 reaches the required concentration, reducing the flow of the introduced inert gas and maintaining the concentration of the inert gas in the box body 8;

s3, start welder 1 and carry out the vibration material disk, transparent fire-retardant board 4 freely slides along X direction and Y direction on cross slide rail 3 under welder 1 ' S drive, and can form effective seal to box 8 all the time, vibration material disk in-process work piece 6 and welder 1 ' S Z direction can increase, in certain extent, welder 1 freely stretches out and draws back in flexible cover 2 ' S within range, but after the increase along with Z direction height is too high, through reducing elevating platform 7 height, realize the free regulation of Z direction.

In the material increase process, the transparent flame-retardant plate 4 and the box door 10 can be used for real-time observation and monitoring, so that the stability of the material increase process is ensured. After the material increase is finished, continuously introducing inert gas, opening the box door 10 after the temperature of the workpiece 6 is reduced to be close to room temperature or the workpiece 6 is not oxidized in the air, stopping inflating, and taking out the workpiece 6 to finish all the working procedures.

The box body 8 effectively prevents the outside air and the inert gas from forming convection current to enter the box body 8 in the movement process of the welding gun 1 through the felt 5, and an effective gas blocking effect is formed due to the fact that the inert gas is introduced all the time. Meanwhile, the felt 5 can support the transparent flame retardant sheet 4 to some extent.