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CN-116967468-B - Integrated forming processing method of active metal melt stirring paddle

CN116967468BCN 116967468 BCN116967468 BCN 116967468BCN-116967468-B

Abstract

The invention relates to an integrated forming processing method of an active metal melt stirring paddle, which comprises the steps of constructing a basic three-dimensional model of a refractory metal stirring paddle, adding a bottom supporting structure to obtain a formed three-dimensional model, carrying out slicing treatment on the formed three-dimensional model to obtain slice data, carrying out scanning path planning on the slice data to obtain scanning path data, carrying out zone-selecting melting scanning printing on refractory metal powder by adopting a laser beam, carrying out layer-by-layer stacking processing to obtain a metal stirring paddle crude product, and carrying out post-treatment and sand blasting treatment to obtain an active metal melt stirring paddle finished product. Compared with the prior art, the invention selectively melts metal powder according to the workpiece model, and prepares the three-dimensional solid part by the modes of laying powder layer by layer and melting, solidifying and accumulating layer by layer, and can integrally form the impeller and the stirring shaft, thereby realizing good high-temperature corrosion resistance of the whole part and prolonging the service life.

Inventors

  • ZHANG QIN
  • ZHAO LANGLANG
  • LIU CAIBING
  • WANG YINGYING
  • SI SHUYAO

Assignees

  • 中核四0四有限公司

Dates

Publication Date
20260508
Application Date
20230721

Claims (7)

  1. 1. An integrated forming processing method of an active metal melt stirring paddle is characterized by comprising the following steps of: S1, constructing a basic three-dimensional model of a refractory metal stirring paddle; S2, based on the basic three-dimensional model, adding a bottom supporting structure to obtain a molded three-dimensional model, wherein the bottom supporting structure comprises a solid supporting structure and a grid supporting structure which are mutually nested; S3, slicing the molded three-dimensional model to obtain slice data, and planning a scanning path of the slice data to obtain scanning path data; s4, based on the scanning path data, performing zone-selecting melting scanning printing on refractory metal powder by adopting laser beams, and performing layer-by-layer stacking processing to obtain a metal stirring paddle crude product; S5, performing post-treatment and sand blasting on the obtained crude product of the metal stirring paddle to obtain a finished product of the active metal melt stirring paddle; in S1, constructing a basic three-dimensional model of the refractory metal stirring paddle by utilizing Solidworks software, wherein the modeling size is 50-100 mm of the height of the stirring paddle, the ratio of the height of the stirring paddle to the diameter of the paddle is 4-6, the circumferential speed is 20-30 cm/S, and the opposite turning angle of the paddle is 35-45 degrees; s2, adding a supporting structure to the bottom of a basic three-dimensional model of the refractory metal stirring paddle by utilizing MATERIALISE MAGICS software; and S3, slicing the molded three-dimensional model by utilizing Build Planner software to obtain slice data, and performing scanning path planning on the slice data to form scanning path data.
  2. 2. The method of claim 1, wherein in S4, the refractory metal powder is one or more selected from the group consisting of tantalum powder, tungsten powder, and molybdenum powder.
  3. 3. The method for integrally forming an active metal melt stirring paddle according to claim 2, wherein in S4, the refractory metal powder is prepared by a plasma rotary electrode atomization process, the particle size of the powder is 10-53 μm, and the oxygen content is lower than 200 ppm.
  4. 4. The integrated forming processing method of the active metal melt stirring paddle according to claim 2, wherein in the step S4, argon with the purity of 99.999% is introduced into a forming bin before the selective melting scanning printing, the flow rate of the argon is 4-5L/min, and the oxygen concentration in the forming bin is controlled to be not higher than 10 ppm.
  5. 5. The method for integrally forming an active metal melt stirring paddle according to claim 1, wherein in S4, in the process of performing selective melting scanning printing, the method specifically comprises: loading the refractory metal powder into a forming bin of a laser selective melting device; uniformly spreading refractory metal powder on a titanium alloy substrate of a forming bin; According to the imported scanning path data, performing selective melting scanning printing on refractory metal powder by adopting laser beams; The parameters of the melt scan printing include: The thickness of the powder is 20-60 mu m, the scanning mode adopts a strip mode, the scanning interval is 0.04-0.11 mm, the light spot diameter is 100 mu m, the laser power is 150-250W, and the scanning speed is 200-800 mm/s.
  6. 6. The method for integrally forming an active metal melt stirring paddle according to claim 1, wherein in S5, the post-treatment comprises placing the crude metal molybdenum stirring paddle in a vacuum heat treatment furnace, preserving heat at 1350 ℃ at 120 min, and vacuum degree of 5 x 10 -3 Pa, eliminating residual stress inside the stirring paddle by heat treatment, preventing cracking and deformation, and cutting the heat-treated metal molybdenum stirring paddle from a substrate.
  7. 7. The method for integrally forming an active metal melt stirring paddle according to claim 1, wherein in step S5, the technological parameters of the sand blasting include that the sand blasted sand is Al 2 O 3 with a diameter of 0.3-0.85 mm and the air pressure is 0.2-0.4 MPa.

Description

Integrated forming processing method of active metal melt stirring paddle Technical Field The invention relates to the field of nuclear metallurgy, in particular to an integrated forming processing method of an active metal melt stirring paddle. Background In the field of nuclear metallurgy, the stirring paddle materials used in the smelting process of active metals and alloys are made of refractory metals tantalum (Tantalum, ta) or tungsten and molybdenum, and have good high-temperature strength and good corrosion resistance to active metals, molten alkali metals and steam. The stirring paddle consists of an impeller and a stirring shaft, and the connection mode between the impeller and the stirring shaft has better stability and reliability. At present, a small impeller is simplified, the impeller is often welded on a hub to form a whole, then the hub is connected on a stirring shaft by a key and a stop screw, or the impeller is directly welded on the stirring shaft, and under the high-temperature condition, the welding part of the stirring paddle is easy to be severely corroded in the long-term contact use process with molten metal, so that the smelted metal solution is polluted. Therefore, if the high-temperature corrosion-resistant material can be integrally formed and processed into the stirring paddle, corrosion failure at the welding position on the stirring paddle can be avoided, and the smelting metal is prevented from being polluted. The structure of the stirring paddle adopted in the stirring of metal powder in the Chinese patent No. 201610877949.9 is that the blade is fixed on the rotating shaft or welded on the rotating shaft through a screw, the powder is easy to accumulate at the screw fixing position or the performance is affected by long-term friction heating between the welding position and the powder during stirring. Chinese patent CN202020738844.7 devised an aluminum alloy melt stirring paddle, which adopts a structure in which blades are welded on a stirring shaft. Chinese patent CN201520143662.4 devised a stirring paddle suitable for iron powder reduction, the blades clamping the rotating shaft or welding on the rotating shaft. Because the patent aims at active metal melt, the stirring paddle material is required to have better corrosion resistance at the high temperature of more than 600 ℃, refractory metals of tantalum, tungsten and molybdenum show great advantages, but because the processability of the materials is poor, the integral forming method of the materials is necessary to be researched, the whole high-temperature corrosion-resistant part is obtained, and the service life is prolonged. Disclosure of Invention The invention provides a processing method for integrally forming high-temperature corrosion resistant material metal, which aims at the problems that the welding part of a stirring paddle is easy to be severely corroded and pollutes the smelted metal solution in the long-term contact use process with high-temperature molten metal. The aim of the invention can be achieved by the following technical scheme: The invention provides an integrated forming processing method of an active metal melt stirring paddle, which comprises the following steps: S1, constructing a basic three-dimensional model of a refractory metal stirring paddle; S2, based on the basic three-dimensional model, adding a bottom supporting structure to obtain a molded three-dimensional model, wherein the bottom supporting structure comprises a solid supporting structure and a grid supporting structure which are mutually nested; S3, slicing the molded three-dimensional model to obtain slice data, and planning a scanning path of the slice data to obtain scanning path data; s4, based on the scanning path data, performing zone-selecting melting scanning printing on refractory metal powder by adopting laser beams, and performing layer-by-layer stacking processing to obtain a metal stirring paddle crude product; and S5, carrying out post-treatment and sand blasting on the obtained crude product of the metal stirring paddle to obtain a finished product of the active metal melt stirring paddle. Further, in S1, a basic three-dimensional model of the refractory metal stirring paddle is constructed by utilizing Solidworks software, wherein the modeling size is 50-100mm in height of the stirring paddle, the ratio of the height of the stirring paddle to the diameter of the paddle is 4-6, the circumferential speed is 20-30cm/S, and the opposite turning angle of the paddle is 35-45 degrees. Further, in S2, a support structure is added to the bottom of the base three-dimensional model of the refractory metal stirring paddle by utilizing MATERIALISE MAGICS software. Further, in S3, slicing the molded three-dimensional model by using Build Planner software to obtain slice data, and performing scan path planning on the slice data to form scan path data. Further, in S4, the refractory metal powder used is one or more select