CN105598452B - A kind of powder recovering device suitable for laser metal forming process - Google Patents

Abstract

The invention discloses a powder recovery device suitable for the laser metal forming process. One path of powder cleaning gas of a powder cleaning module is divided into two paths of gas after passing through a three-position two-way electromagnetic valve, and enters a powder cleaning air channel on a powder feeding nozzle; The forming substrate is installed on the porous workbench of the powder conveying and filtration module. A powder recovery funnel is installed under the porous workbench. A powder recovery channel is installed under the funnel. A detachable drawer-type bladeless fan and a low-mesh net are installed in the recovery channel in sequence. Sieve, high-mesh mesh sieve; the powder recovery bag installation seat, powder baffle and powder recovery bag of the powder collection module are installed at the end of the recovery channel. The invention can be used in the field of laser metal forming, realizes the integration of powder collection, screening and recovery in the process of laser metal forming, improves the utilization rate of powder, reduces the cost of laser metal forming process; reduces the need for powder cleaning after processing The probability of human contact with powder ensures the safety of operators during processing.

Description

A powder recovery device suitable for laser metal forming process

technical field

The invention belongs to the field of laser metal forming, in particular to a powder recovery device used in the process of laser metal forming.

Background technique

Laser metal forming technology is a kind of additive manufacturing technology. The process is that the laser forms a molten pool on the surface of the formed substrate. The powder feeding system sends the metal powder into the molten pool for melting. As the molten pool moves from point to line, from line To surface, surface and surface superimposed to form a solid part. Due to the small size and fast cooling of the laser molten pool, the metal powder cannot completely enter the molten pool for melting, and part of the powder is scattered outside the molten pool, which makes the utilization rate of the powder low. In order to improve the utilization rate of materials, it is very meaningful to collect and screen the scattered powder for reuse. At present, the recovery of laser metal forming powder mainly adopts manual methods to collect unused powder, and then manually sieves the powder for powder recovery. However, the particle size of the metal powder used for laser metal direct forming is only tens of microns, which can enter the human body in various ways, and it is extremely difficult to protect, and the metal powder causes great harm to human health. Therefore, it is necessary to design a simple and efficient recovery device that can continuously collect metal powder during laser metal forming.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a powder recovery device suitable for laser metal forming process, which is simple and efficient, and meets the demand for metal powder recovery in the laser metal forming process.

The present invention is realized by adopting the following technical solutions:

The metal powder recovery device used in the laser metal forming process mainly includes: a powder cleaning module, a powder conveying and filtering module, and a powder collecting module. The powder cleaning module consists of a gas pipeline, a two-position three-way solenoid valve, and a powder feeding nozzle. One path of powder cleaning gas passes through the solenoid valve and is divided into two paths of gas to enter the powder cleaning gas channel of the powder feeding nozzle. The cleaning gas in the powder feeding nozzle The powder gas channel is directly connected to the forming substrate and the porous workbench of the powder conveying and filtering module; The forming substrate is installed on the porous workbench, and the powder recovery funnel is installed under the porous workbench. The powder recovery funnel is connected with the powder recovery channel, and the bladeless fan and low-mesh mesh screen are installed in the recovery channel in sequence. The high-mesh mesh screens are all detachable drawer-type structures; the powder collection module includes: powder recovery bag mounting seat, powder baffle plate, drawer-type detachable powder recovery bag, and the powder recovery bag mounting seat is installed at the end of the powder recovery channel. The powder baffle is installed on the powder recovery bag mount, and the powder recovery bag is mounted on the powder recovery bag mount.

In the above solution: the powder cleaning module uses a solenoid valve to divide one gas into two gas channels that can be started and stopped. The gas enters the powder cleaning gas channel in the powder feeding nozzle, and then acts on the forming substrate and the porous workbench.

The powder conveying and filtering module of the metal powder recovery device used in the laser metal forming process consists of a powder recovery funnel, a drawer-type bladeless fan installed in sequence from top to bottom in the powder recovery channel, and a mesh screen for filtering powder.

The powder collection module of the metal powder recovery device used in the laser metal forming process is composed of a powder recovery bag mounting seat installed at the end of the powder recovery channel, a powder baffle plate, and a powder recovery bag. After the powder passes through the powder conveying and filtering module Enter the powder recovery bag or stay in the powder recovery bag installation seat under the action of the powder baffle.

Compared with existing equipment, the main advantages of the present invention are:

The invention adopts the powder cleaning gas to clean the powder on the workbench and the substrate, avoiding the possible harm to the human body caused by manually cleaning the powder.

The invention adopts the bladeless fan to provide power for the powder conveying process, which is smaller in size and lower in energy consumption compared with the fan.

The present invention adopts a powder collection method combining a drawer-type powder recovery bag and a powder baffle plate to avoid spilling and pollution of the powder in the recovery process.

Description of drawings

Fig. 1 is the overall structural diagram of device of the present invention;

Fig. 2 is the structure diagram of the powder recovery channel of the device of the present invention;

Fig. 3 is the working state structural diagram of the powder recovery bag of the device of the present invention;

Fig. 4 is a structural diagram of the powder recovery bag of the device of the present invention in a closed state;

In Figures 1 to 3: 1 is the powder cleaning gas delivery channel, 2 is the two-position three-way solenoid valve, 3 and 4 are two-way powder cleaning gas channels, 5 is the powder feeding nozzle, 6 is the powder pipe, and 7 is the laser metal Formed forming substrate, 8 is a porous workbench, 9 is a powder recovery funnel, 10 is a powder recovery channel, 11 is a reverse-installed drawer-type fan without blades, 12 is a small-mesh mesh screen, and 13 is a large-mesh mesh Sieve, 14 is the powder recovery bag installation seat, 15 is the powder baffle plate, 16 is the drawer type powder recovery bag, 17 is the positioning pin of the powder recovery bag, 18 is the lock nut of the powder recovery bag positioning pin, 19 is the powder recovery bag positioning pin Lock spring.

Detailed ways

Refer to Figure 1 for the overall structure diagram of a metal powder recovery device used in the laser metal forming process, refer to Figure 2 and Figure 3 for the structure diagram of the powder recovery channel and recovery bag, respectively, and refer to Figure 4 for the powder recovery bag after powder recovery. Including powder cleaning module, powder collection and delivery module, powder collection module.

Referring to Figure 1, the powder recovery device is composed of 1 to 6 in Figure 1, of which 1 is the two-position three-way solenoid valve for the powder cleaning gas to enter, and then divided into two-way gas 3 and 4 that can be opened independently and simultaneously. The gas enters the powder cleaning gas channel in the powder feeding nozzle 5 along the pipeline, and the moving platform drives the nozzle to move above the workbench. The solenoid valve controls the start and stop of the powder cleaning gas in the two routes 3 and 4, and completes the forming substrate 7, the porous Clean up the powder scattered on the workbench 8.

Referring to Figure 2, the powder falls from the hole on the porous workbench 8 into the powder recovery funnel 9 under the action of the powder cleaning gas, and part of the powder in the recovery funnel falls into the powder feeding channel 10, and the other part stays on the inner wall of the funnel; A drawer-type bladeless fan 11, a drawer-type small-mesh mesh screen 12, and a drawer-type large-mesh mesh screen 13 are sequentially installed in the channel 10, and the drawer-type installation is convenient for disassembly and cleaning; the reverse-installed bladeless fan produces The airflow completes the cleaning of the retained powder on the inner wall of the funnel, and drives the powder to pass through the drawer-type small-mesh mesh screen 12 and the large-mesh mesh screen 13 in turn in the powder recovery channel, and then enters the powder recovery bag 16; there is no fan blade fan during this process. The airflow provides power for the powder to pass through the mesh sieve and reach the powder recovery bag. The small-mesh mesh 12 and the large-mesh mesh 13 complete the coarse and fine filtration of the powder, and the powder that meets the requirements of use enters the powder recovery bag 16 through the mesh. Impurities stay on the mesh screen and wait for the powder recovery to be cleaned up.

Referring to Fig. 3, the powder recovery bag 16 is installed on the recovery bag mounting seat 14. After the installation is completed, the positioning pin 17 on the powder recovery bag enters into the positioning position on the powder recovery bag mounting seat 14 under the action of the elastic force released by the locking spring 19. Holes complete the positioning of the powder recovery bag 16, and the powder recovery bag 16 cannot be removed before the powder recovery is completed.

Referring to Fig. 4, after the powder recovery is completed, insert the powder baffle plate 15 into the powder recovery mounting base 14, the powder baffle plate 15 presses down the positioning pin 17, the locking spring 19 is in a compressed state, and the positioning pin 17 is released from the positioning hole. Exit. At this time, the powder recovery bag 16 can be pulled to the outside of the powder recovery channel 10, and the powder recovery bag 16 can be unloaded. At this time, under the action of the powder baffle plate 15, the powder in the recovery channel is retained on the powder baffle plate 15 , will not spill.

Claims (4)

1. A powder recovery device suitable for the laser metal forming process, including a powder cleaning module, a powder conveying and filtering module, and a powder collection module. The gas is divided into two paths and enters the powder cleaning air channel on the powder feeding nozzle; the forming substrate is installed on the porous workbench of the powder conveying and filtration module, the powder recovery funnel is installed under the porous workbench, the powder recovery channel is installed under the funnel, and the recovery channel The leafless fan, low-mesh mesh screen and high-mesh mesh screen installed in sequence in the middle are all detachable drawer structures; the powder recovery bag mounting seat, powder baffle plate and powder recovery bag of the powder collection module are installed at the end of the recovery channel . 2. A powder recovery device suitable for laser metal forming process according to claim 1, characterized in that, one path of powder cleaning gas of the powder cleaning module is divided into two paths with controllable start and stop after passing through a two-position three-way solenoid valve The gas enters the nozzle and enters the porous worktable through the powder cleaning air channel in the powder feeding nozzle. 3. A powder recovery device suitable for laser metal forming process according to claim 1, characterized in that the forming substrate of the powder conveying and filtering module is installed on the porous workbench, and the powder cleaning airflow acts on the forming substrate and the porous workbench The powder recovery funnel is installed on the lower part of the multi-hole workbench, and the funnel is connected to the powder recovery channel. The leafless fan, low-mesh mesh screen and high-mesh mesh screen installed in sequence in the powder recovery channel are all detachable drawer structures. 4. A powder recovery device suitable for laser metal forming process according to claim 1, characterized in that the powder recovery bag mounting seat of the powder collection module is installed at the end of the powder recovery channel, and the powder baffle and the powder recovery bag are installed on the On the recovery bag mounting seat, the recovery bag is equipped with an elastic locking head, which is inserted into the positioning hole on the mounting seat to fix the recovery bag; the powder baffle plate is installed above the recovery bag.