CN105170988B - A kind of method and device for reclaiming residual powder on metal increasing material manufacturing substrate - Google Patents

Abstract

The invention discloses a kind of method and device for reclaiming residual powder on metal increasing material manufacturing substrate, including gas-tight silo, the pneumatic vibrator being arranged on outside gas-tight silo, the vibration hold assembly for being used to transmit vibration being arranged on gas-tight silo madial wall, hold assembly connection pneumatic vibrator is vibrated, vibration hold assembly is used for the substrate for clamping molding part and provides mechanical oscillation to substrate；Gas-tight silo is provided with high pressure air rifle and inert gas air inlet.This method and device not only can be more thoroughly the residual powder got rid of on substrate, and deimpurity powder circulation will be sieved and utilized, and save material；Because whole removal process is carried out under inert gas shielding, it is also prevented from the oxidation of powder and makes moist, ensures that original quality of powder is constant.

Description

A method and device for recovering residual powder on metal additive manufacturing substrates

technical field

The invention relates to the field of additive manufacturing of powder materials, in particular to a method and device for recovering residual powder on metal additive manufacturing substrates.

Background technique

Additive manufacturing, also commonly known as 3D printing, is a technology that uses CAD design data to accumulate material layer by layer to manufacture solid parts. Compared with traditional material removal (cutting) technology, it is a "bottom-up" material accumulation process. Production method. Compared with traditional manufacturing technologies, additive manufacturing has the advantages of being able to form parts with complex shapes, high forming precision, and saving materials.

The molding materials of additive manufacturing can be divided into three categories: powder materials, linear materials and liquid materials according to the different forms. Among them, powder molding materials include metal powder, ceramic powder and polymer powder materials such as polyethylene. It is widely used in laser selective melting, laser selective sintering, electron beam selective melting and other additive manufacturing methods.

These additive manufacturing technologies, laser selective melting and electron beam selective melting, all adopt powder preset molding methods, that is, the powder is evenly spread on the molding substrate during the molding process, and after a layer is melted with laser or electron beam , and then spread a layer of powder, adding up layer by layer until the parts are processed. After processing, the parts will be covered with powder, and the powder around the parts needs to be swept away with a brush, and the excess powder can be recycled. However, for complex-shaped free-form surface parts, porous structure parts and hollow structure parts, in order to be able to form smoothly during processing, it is necessary to add a lot of support. After the machining of these parts, a lot of powder remains between the bottom of the part and the support, and it is difficult to remove.

The current method of removing residual powder from this type of substrate is usually to take out the substrate and tap the side and back of the substrate with a hammer to shake off the powder; or use a high-pressure air gun to blow air against the surface of the substrate to blow away the residual powder. There are the following disadvantages in removing the residual powder like this: the first, when hitting the substrate with a hammer or blowing the substrate with compressed gas, the residual powder will rise and scatter around, polluting the environment and easily causing injury to operators; , such an operation method is difficult to completely remove the residual powder at the bottom of the part, and the flying powder cannot be recovered, which wastes materials; third, for active metal powders such as titanium alloys, if they are exposed to air, the powder will Oxidation occurs.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and to provide a method and device for recovering residual powder on metal additive manufacturing substrates with a simple and practical structure. It overcomes the technical problem in the prior art that the residual powder between the gap between the molded part and the substrate and inside the supporting part of the molded part is difficult to take out.

The present invention realizes through following technical scheme:

A device for recovering residual powder on metal additive manufacturing substrates, comprising a sealed chamber 1, a pneumatic vibrator 6 arranged outside the sealed chamber 1, and a vibration clamping part arranged on the inner wall of the sealed chamber 1 for transmitting vibrations, The vibration clamping part is connected to the pneumatic vibrator 6, and the vibration clamping part is used to clamp the substrate 10 of the molding 11 and provide mechanical vibration to the substrate 10;

A high-pressure air gun 3 and an inert gas inlet 4 are provided on the upper side wall of the vibration clamping part in the sealed chamber 1, and the high-pressure air gun 3 and the inert gas inlet 4 are respectively connected to the external inert gas storage tank 2.

The vibrating clamping part includes a rotating connecting rod 8 and a substrate vibrating fixture 9 for clamping the substrate 10 . The rotating connecting rod 8 is arranged on the side wall of the sealed chamber 1 to provide mechanical vibration for the substrate vibrating fixture 9 .

The bottom of the sealed chamber 1 is provided with a powder recovery device.

The powder recovery device includes a powder vibration filter sieve 15, an impurity recovery cylinder 16 for recovering impurities 17 in the powder, and a powder recovery cylinder 18 for collecting the powder that falls from the powder vibration filter sieve 15.

The recovery port of the impurity recovery cylinder 16 is provided with a switch.

An oxygen content monitor 13 and a dust removal exhaust port 14 are arranged on the lower side wall of the sealed chamber 1 .

The bottom of the sealed chamber 1 is a funnel-shaped structure; the top of the sealed chamber 1 has a movable sealing cover 1-1; the side wall of the sealed chamber 1 is provided with a glove box inlet 5, and the pneumatic vibrator 6 has a person Machine interactive operation screen 7.

Here are ways to recycle powder residue on metal additive manufacturing substrates:

Step 1: After the additive manufacturing molding is completed, remove the substrate 10; open the sealing cover 1-1, fix the substrate 10 on the substrate vibration fixture 9, close the sealing cover 1-1, and open the valve of the inert gas storage tank 2 , feed an inert protective gas into the inside of the sealed chamber 1, and observe the reading change of the oxygen content monitor 13 in the sealed chamber 1;

If the recovered powder is non-reactive metal powder, then feed N2 as a protective gas, and if the recovered powder is active metal powder, then feed Ar as a protective gas;

Step 2: When the oxygen concentration in the sealed chamber 1 is lower than 0.8%, turn on the pneumatic vibrator 6, and adjust the frequency of the pneumatic vibrator 6 through the man-machine interactive operation panel 7, so that the vibration frequency of the substrate 10 is between 100HZ and 150HZ During the period, the vibration frequency of the powder vibrating filter sieve 15 is between 50HZ and 100HZ; the recyclable powder that can pass through the powder vibrating filter sieve 15 falls into the powder recovery cylinder 18;

Step 3: Manually operate through the glove box inlet 5, so that the substrate vibrating fixture 9 drives the substrate 10 to rotate around the rotating connecting rod 8, so that the residual powder on the substrate 10 is shaken off; manually operate the high-pressure air gun 3 through the glove box inlet 5, and align The support part 12 between the molded part 11 and the substrate 10 is blown away with high-pressure inert gas to remove the residual powder that cannot be shaken off by vibration, and then blows away the powder attached to the inner wall of the sealed chamber 1 with a high-pressure air gun 3; shake off and blow off The residual powder falls on the powder vibrating filter sieve 15, so that the recyclable powder that can pass through the powder vibrating filtering sieve 15 falls into the powder recovery cylinder 18, and the impurities 17 that cannot pass through the powder vibrating filtering sieve 15 remain in the powder vibrating filter Sieve 15 on;

When the powder vibration screening is finished, close the pneumatic vibrator 6, turn on the switch of the impurity recovery cylinder 16, use a powder brush to sweep the large particle impurities 17 on the surface of the powder vibrating filter sieve 15 into the impurity recovery cylinder 16, take out the substrate 10, remove the The impurity recovery cylinder 16 and the powder recovery cylinder 18 pour the recovered powder 19 into the 3D printer for recycling; the recovery of the residual powder on the substrate is completed.

Compared with the prior art, the present invention has the following advantages and effects:

The present invention can not only thoroughly remove the residual powder on the substrate, but also recycle the powder sieved out of impurities, saving materials; since the whole recycling process is carried out under the protection of inert gas, it can also prevent the powder from being oxidized and damp. The original quality of the powder is guaranteed to remain unchanged.

There is a glove box entrance (glove box) on the side wall of the sealed chamber, which can be manually assisted by manual operation, which not only further makes the powder cleaning more sufficient, but also prevents the powder from harming the operator and polluting the environment.

The technical means of the invention is simple and easy, and the residual powder is cleaned without pollution and collected, and the quality of the collected powder remains unchanged.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the device for recovering residual powder on the metal additive manufacturing substrate of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with specific embodiments.

Example

As shown in Figure 1. The present invention is a device for recovering residual powder on metal additive manufacturing substrates, comprising a sealed chamber 1, a pneumatic vibrator 6 arranged outside the sealed chamber 1, and a vibration clamp arranged on the inner wall of the sealed chamber 1 for transmitting vibration Components, the vibration clamping component is connected to the pneumatic vibrator 6, the vibration clamping component is used to clamp the substrate 10 of the molded part 11, and provide mechanical vibration to the substrate 10;

A high-pressure air gun 3 and an inert gas inlet 4 are provided on the upper side wall of the vibration clamping part in the sealed chamber 1, and the high-pressure air gun 3 and the inert gas inlet 4 are respectively connected to the external inert gas storage tank 2.

The vibrating clamping part includes a rotating connecting rod 8 and a substrate vibrating fixture 9 for clamping the substrate 10 . The rotating connecting rod 8 is arranged on the side wall of the sealed chamber 1 to provide mechanical vibration for the substrate vibrating fixture 9 .

The bottom of the sealed chamber 1 is provided with a powder recovery device.

The powder recovery device includes a powder vibration filter sieve 15, an impurity recovery cylinder 16 for recovering impurities 17 in the powder, and a powder recovery cylinder 18 for collecting the powder that falls from the powder vibration filter sieve 15.

The pneumatic vibrator 6 is the power source for vibrating the powder vibration filter screen 15 and the substrate 10 .

A switch can also be set at the recovery outlet of the impurity recovery cylinder 16 .

An oxygen content monitor 13 and a dust removal exhaust port 14 are arranged on the lower side wall of the sealed chamber 1 . The dust removal exhaust port 14 is to ensure the circulation of the air in the sealed chamber 1. When the inert gas is introduced, the internal air can be discharged from the outlet, and powder leakage can also be prevented.

The bottom of the sealed chamber 1 is a funnel-shaped structure; the top of the sealed chamber 1 has a movable sealing cover 1-1; the side wall of the sealed chamber 1 is provided with a glove box inlet 5, which is operated through plastic gloves to prevent powder Leakage protects the operator. The pneumatic vibrator 6 has a human-computer interaction operation screen 7 .

Here are ways to recycle powder residue on metal additive manufacturing substrates:

Step 1: After the additive manufacturing molding is completed, remove the substrate 10; open the sealing cover 1-1, fix the substrate 10 on the substrate vibration fixture 9, close the sealing cover 1-1, and open the valve of the inert gas storage tank 2 , feed an inert protective gas into the inside of the sealed chamber 1, and observe the reading change of the oxygen content monitor 13 in the sealed chamber 1;

If the recovered powder is inactive metal powder such as stainless steel, cobalt-chromium alloy or ceramics, then feed N2 as a protective gas, and if the recovered powder is active metal powder such as titanium alloy or aluminum alloy, then feed Ar as a protective gas;

Step 2: When the oxygen concentration in the sealed chamber 1 is lower than 0.8%, turn on the pneumatic vibrator 6, and adjust the frequency of the pneumatic vibrator 6 through the man-machine interactive operation panel 7, so that the vibration frequency of the substrate 10 is between 100HZ and 150HZ Between, the vibration frequency of the powder vibrating filter sieve 15 is between 50HZ～100HZ; the recyclable powder (small particles) that can pass through the powder vibrating filter sieve 15 falls into the powder recovery cylinder 18;

Step 3: Manually operate through the glove box inlet 5, so that the substrate vibrating fixture 9 drives the substrate 10 to rotate around the rotating connecting rod 8, so that the residual powder on the substrate 10 is shaken off; manually operate the high-pressure air gun 3 through the glove box inlet 5, and align The support part 12 between the molded part 11 and the substrate 10 is blown away with high-pressure inert gas to remove the residual powder that cannot be shaken off by vibration, and then blows away the powder attached to the inner wall of the sealed chamber 1 with a high-pressure air gun 3; shake off and blow off The residual powder falls on the powder vibrating filter sieve 15, so that the recyclable powder (small particles) that can pass through the powder vibrating filtering sieve 15 falls into the powder recovery cylinder 18, and the impurities 17 that cannot pass through the powder vibrating filtering sieve 15 remain. On the powder vibration filter sieve 15;

After the powder vibration screening is finished, close the pneumatic vibrator 6, open the switch of the impurity recovery cylinder 16, sweep the large particle impurities 17 (large particles) on the surface of the powder vibration filter sieve 15 into the impurity recovery cylinder 16 with a powder brush, and take out the substrate 10. Remove the impurity recovery cylinder 16 and the powder recovery cylinder 18, pour the recovered powder 19 into the 3D printer for recycling; complete the gap between the molded part 11 and the substrate 10, and the inside of the support part 12 of the molded part 11. Cleaning and recovery of residual powder.

As described above, the present invention can be preferably carried out.

The implementation of the present invention is not limited by the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods, and are all included in within the protection scope of the present invention.

Claims (6)

1. A method for recovering residual powder on metal additive manufacturing substrates, comprising a device for recovering residual powder on metal additive manufacturing substrates, the device comprising a sealed chamber (1), a pneumatic vibrator arranged outside the sealed chamber (1) (6) A vibrating clamping part for transmitting vibrations arranged on the inner wall of the sealed chamber (1), the vibrating clamping part is connected to the pneumatic vibrator (6), and the vibrating clamping part is used to clamp the molded part (11) the substrate (10), and provide mechanical vibration to the substrate (10); The upper side wall of the vibration clamping part in the sealed chamber (1) is provided with a high-pressure air gun (3) and an inert gas inlet (4), and the high-pressure air gun (3) and the inert gas inlet (4) are respectively connected to the external Inert gas storage tank (2); The vibration clamping part includes a rotating connecting rod (8) and a substrate vibration clamp (9) for clamping the substrate (10), the rotating connecting rod (8) is arranged on the side wall of the sealed chamber (1), Provide mechanical vibration for the substrate vibration fixture (9); The powder recovery device comprises a powder vibrating filter sieve (15), an impurity recovery cylinder (16) for reclaiming impurities (17) in the powder, and a powder recovery cylinder (16) for collecting the powder falling from the powder vibrating filter sieve (15) sieve ( 18); An oxygen content monitor (13) and a dust removal exhaust port (14) are arranged on the lower side wall of the sealed chamber (1); The bottom of the sealed chamber (1) has a funnel-shaped structure; the top of the sealed chamber (1) has a movable sealing cover (1-1); It is characterized in that the method of recycling the residual powder on the metal additive manufacturing substrate is realized through the following steps: The first step: After the additive manufacturing molding is completed, remove the substrate (10); open the sealing cover (1-1), fix the substrate (10) on the substrate vibration fixture (9) and close the sealing cover 1-1, Open the valve of the inert gas storage tank (2), pass the inert protective gas into the inside of the sealed chamber (1), observe the reading change of the oxygen content monitor (13) in the sealed chamber (1); if the recovered powder is an inactive metal powder , then feed N2 as a protective gas, and if the recovered powder is an active metal powder, then feed Ar as a protective gas; Step 2: When the oxygen content concentration in the sealed chamber (1) is lower than 0.8%, turn on the pneumatic vibrator (6), and adjust the frequency of the pneumatic vibrator (6) through the human-computer interaction operation panel (7), so that the substrate ( 10) The vibration frequency is between 100HZ～150HZ, so that the vibration frequency of the powder vibrating sieve (15) is between 50HZ～100HZ; the powder that can pass through the powder vibrating sieve 15 falls into the powder recovery cylinder 18. 2. According to claim 1, the method for reclaiming residual powder on the metal additive manufacturing substrate is characterized in that it also includes a manual auxiliary operation step: Through the manual operation of the glove box entrance (5), the substrate vibration fixture (9) drives the substrate (10) to rotate around the rotating connecting rod (8), so that the residual powder on the substrate (10) is shaken off; through the glove box entrance (5) Manually operate the high-pressure air gun (3), align the supporting part (12) between the molded part (11) and the substrate (10), blow off the residual powder that cannot be shaken off with an inert gas, and then use the high-pressure air gun (3) to The powder attached to the inner wall of the sealed chamber (1) is blown away; the residual powder shaken off and blown off falls on the powder vibrating filter sieve (15), so that the recyclable powder that can pass through the powder vibrating filter sieve (15) falls Into the powder recovery cylinder (18), the impurity (17) that cannot pass through the powder vibrating filter sieve (15) stays on the powder vibrating filter sieve (15); After the powder vibration screening is finished, close the pneumatic vibrator (6), turn on the switch of the impurity recovery cylinder (16), and use a powder brush to sweep the large particle impurities (17) on the surface of the powder vibration filter sieve (15) into the impurity recovery cylinder ( 16), take out the substrate (10), remove the impurity recovery cylinder (16) and powder recovery cylinder (18), pour the recovered powder (19) into the 3D printer for recycling; complete the recovery of residual powder. 3. The method for recovering residual powder on metal additive manufacturing substrates according to claim 2, characterized in that: a powder recovery device is provided at the bottom of the sealed chamber (1). 4. The method for recovering residual powder on metal additive manufacturing substrates according to claim 2, characterized in that: the recovery port of the impurity recovery cylinder (16) is provided with a switch. 5. The method for recovering residual powder on metal additive manufacturing substrates according to claim 2, characterized in that: the bottom of the sealed chamber (1) has a funnel-shaped structure; the top of the sealed chamber (1) has a movable sealing cover (1-1). 6. The method for recovering residual powder on metal additive manufacturing substrates according to claim 2, characterized in that: a glove box entrance (5) is provided on the side wall of the sealed chamber (1), and the pneumatic vibrator ( 6) It has a human-computer interaction operation screen (7).