CN107030284A - A kind of blade impeller selective laser sintering lifting platform - Google Patents

Abstract

The invention discloses a five-blade impeller selective laser sintering lifting platform, which is mainly composed of a powder supply/recovery system, a processing system, an optical system and the like. Among them, the powder supply/recovery system is composed of a powder supply cylinder, a powder spreading roller, and a recovery cylinder. The processing system consists of a lifting table and a push rod. The optical system is composed of laser transmitter, scanning mirror and so on. By lifting the push rod of the worktable, the structure of the push rod is transformed into a ball screw structure, and the rotation angle is 72° every time a layer is lowered, thereby changing the printing direction, which not only effectively controls the warpage caused by the uneven distribution of laser energy Accumulate, and greatly reduce the step effect, and further improve the surface accuracy of the blade impeller manufacturing. Changing the printing direction to improve its mechanical performance can promote the application of the lifting table in the field of blade manufacturing and improve the processing quality of the five-blade impeller.

Description

A lifting platform for selective laser sintering of blade impeller

technical field

The invention relates to a five-blade impeller selective laser sintering lifting platform, specifically an experimental device for manufacturing a five-blade impeller using selective laser sintering technology, through which the processing and production of the five-blade impeller can be realized, and various mechanical properties of its production can be guaranteed It is superior to the five-blade impeller produced by traditional selective laser sintering.

Background technique

In recent years, the direct additive manufacturing process for metal materials has been rapidly promoted and developed, especially laser near-net shaping, which can form structures with arbitrary shape and complexity in space, adapt to any cladding metal materials, and the utilization rate of forming materials High, simple process without high-temperature after-treatment and other advantages, it has been highly concerned and researched by the aviation industry at home and abroad, and it has become an ideal means of manufacturing high-performance alloy turbine blades.

Since the new alloy turbine blade has a complex streamlined profile and built-in a large number of complex curved surface flow channel structures, the requirements for manufacturing and forming precision are extremely strict. Using the current additive manufacturing technology, due to its layered forming manufacturing principle, it is difficult to avoid There will be a step effect, which will affect the improvement of the manufacturing precision of alloy turbine blades. The above defects have seriously hindered the further development of the additive manufacturing industry of alloy turbine blades.

Contents of the invention

The purpose of the present invention is to solve the problems of insufficient surface precision, need for reprocessing and insufficient mechanical properties caused by the use of selective laser sintering equipment to manufacture five-blade impellers. By using the ball screw structure, the lifting platform rotates while changing the layer height, so that the printing direction can be changed without stopping the machine, and the surface accuracy problem caused by the accumulation of the step effect of each layer caused by layered processing can be reduced. Reduce the surface warpage caused by the uneven distribution of laser energy, and improve the mechanical properties of the blade by changing the direction.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A blade impeller selective laser sintering lifting platform, including a liftable workbench fixed on the frame, powder supply system and recovery system are respectively installed on both sides of the workbench, laser and scanning are installed above the workbench The top of the workbench shows that there is a powder spreading roller, which is driven by a cylinder, and the powder spreading roller can roll back and forth between the powder supply system and the recovery system; the bottom of the workbench is fixed with a ball screw, so The ball screw described above is driven by a motor at the bottom of the frame.

As a further improvement of the above technical solution: every time the motor drives the ball screw to rotate 72°, the worktable rises by one layer thickness. In the present invention, the push rod is composed of a sealing ring, a circulator, an oil hole, a ball, a nut and a screw rod, etc., and is used to push the worktable to rotate while moving up and down and ensure the rotation accuracy.

The beneficial effect of the present invention is that, using the selective laser sintering lifting table structure, using the ball screw structure, it rotates while moving up and down. During the molding process, the five-blade impeller automatically rotates 72° after each layer is formed, and then Printing the next layer, this method reduces the accumulation of the step effect caused by the same printing direction by changing the printing direction of each layer of the blade, and by rotating, changes the laser energy received by each layer of blades, reducing the laser energy distribution Warping effects due to unevenness. Moreover, by changing the printing direction of each layer, the overall mechanical properties of the blade are improved. Therefore, the device of the present invention greatly improves the surface precision and mechanical properties of the selective laser sintering blade.

Description of drawings

Fig. 1 is a structural schematic diagram of the lifting platform of the present invention.

Fig. 2 is a schematic diagram of the overall selective laser sintering equipment in the present invention.

Fig. 3 is a schematic diagram of the overall equipment of the present invention.

In the figure: 1. Rack; 2. Workbench; 3. Powder supply system; 4. Recovery system; 5. Laser; 6. Scanning mirror; 7. Powder spreading roller; 8. Cylinder; 9. Ball screw; 10 , Motor; 11, sealed box.

specific implementation plan

As shown in Figures 1 to 3, the blade impeller selective laser sintering elevating platform of this embodiment includes a liftable workbench 2 fixed on the frame 1, and powder supply systems 3 are respectively provided on both sides of the workbench 2 And recovery system 4, a laser 5 and a scanning mirror 6 are installed on the top of the worktable 2, and a powder spreading roller 7 is shown on the top of the workbench 2. The powder spreading roller 7 is driven by a cylinder 8, and the powder spreading roller 7 can be used in the powder supply system. 3 and the recovery system 4 roll back and forth; the bottom of the workbench 2 is fixedly connected with a ball screw 9, and the ball screw 9 is driven by the motor 10 at the bottom of the frame 1. In the present invention, when the five-blade impeller is processed, the motor 10 drives the ball screw 9 to rotate 72°, and the workbench 2 rises by one layer thickness. The laser light emitted by the laser 5 is refracted by the scanning mirror 6 to change the direction of the laser light to the workbench 2, and then scans through the preset path. The metal powder brought by the powder spreading roller 7 from the powder box is sintered according to the preset shape. At this time, the powder spreading roller 7 Take the remaining powder to the collection box (recovery system 4) for reuse. Then the workbench 2 is lowered by one floor height. At the same time, due to the ball screw structure, the workbench 2 rotates clockwise by 72° while the one floor height is lowered, and the powder spreading roller returns to the original position to repeat the process until the five-fan blade is manufactured. Finish.

For the above-mentioned selective laser sintering experimental equipment for blade impellers, in order to facilitate the verification that the surface quality and mechanical properties of the processed blades have been improved, before processing the blades, the same workpiece was first used under the same working conditions. Ordinary selective laser sintering equipment is used for processing to obtain the surface morphology, surface roughness and mechanical properties of the processed blade, and then compared with the blade impeller selective laser sintering equipment of the present invention.

When using the five-blade impeller selective laser sintering experimental equipment of the above embodiment to process the blades, the type of laser should be reasonably selected according to the processing requirements, and the layer thickness, scanning distance, scanning speed, ambient temperature, scanning mode and laser power should be set. Process parameters to process the blades. After the processing is completed, the surface roughness meter is used to measure the roughness value of the section, the tensile and bending mechanical properties of the material are tested by the universal testing machine, and the section morphology is observed by the scanning electron microscope (SEM).

After processing, cut off all power, clean up the processing site, disassemble each device, clean and dry each part, and perform corresponding maintenance and maintenance regularly for continued use in the next processing.

Claims (2)

1. A blade impeller selective laser sintering lifting platform is characterized in that: comprise the liftable workbench (2) that is fixed on the frame (1), the both sides of described workbench (2) are respectively provided with for Powder system (3) and recovery system (4), laser (5) and scanning mirror (6) are installed on the top of workbench (2), and powder spreading roller (7) is arranged on the top of workbench (2), so The powder spreading roller (7) is driven by the air cylinder (8), and the powder spreading roller (7) can roll back and forth between the powder supply system (3) and the recovery system (4); the bottom of the workbench (2) is fixed with a ball Screw mandrel (9), described ball screw mandrel (9) is driven by the motor (10) of frame (1) bottom. 2. The blade impeller selective laser sintering lifting table according to claim 1, characterized in that: the motor (10) drives the ball screw (9) to rotate 72°, and the table (2) rises or falls One layer thick.