CN-121972668-A - Flywheel bracket manufacturing process method

CN121972668ACN 121972668 ACN121972668 ACN 121972668ACN-121972668-A

Abstract

The invention provides a flywheel bracket manufacturing process method which comprises the steps of S1, selecting materials and a processing technology of a base part and a supporting leg part of a flywheel bracket based on the function requirement of the flywheel bracket, S2, carrying out topological lightweight structural design on the flywheel bracket, S3, adopting machining to prepare the base part of the flywheel bracket, S4, connecting the supporting leg part of the flywheel bracket and the base part by using a laser selective melting forming method to form a flywheel bracket blank, S5, carrying out heat treatment on the flywheel bracket blank, and S6, carrying out machining on the flywheel bracket blank to finally realize flywheel bracket manufacturing. Based on the structural characteristics, the composite manufacturing process of machining and laser selective melting is adopted, the base part is prepared by adopting the machining process, the supporting leg part and the mounting part are prepared by adopting the laser selective melting process, the advantages of different machining processes are effectively combined, and the high-quality forming of the flywheel bracket is realized.

Inventors

DU LEI
YAO FEI
XIAO MEILI
FU YANFEI
LEI LEI
KE LINDA
Xi Heyu
YANG FAN

Assignees

上海航天精密机械研究所

Dates

Publication Date: 20260505
Application Date: 20260113

Claims (10)

1. The manufacturing process method of the flywheel bracket is characterized by comprising the following steps of: S1, selecting materials and processing technology of a base part and a supporting leg part of a flywheel bracket based on the functional requirement of the flywheel bracket; s2, performing topological lightweight structural design on the flywheel bracket; s3, preparing a base part of the flywheel bracket by machining; s4, forming a supporting leg part and a mounting part of the flywheel bracket by using a laser selective melting forming method on the base part so as to form a flywheel bracket blank; S5, performing heat treatment on the flywheel bracket blank; and S6, machining the flywheel bracket blank to finally realize the manufacture of the flywheel bracket.
2. The flywheel bracket manufacturing process according to claim 1, wherein in the step S1, the base portion of the flywheel bracket is made of a magnesium alloy material having a thermal conductivity equal to or higher than a thermal conductivity threshold, and the support leg portion is made of a magnesium alloy material having a tensile strength equal to or higher than a strength threshold.
3. The flywheel bracket manufacturing process according to claim 2, wherein in the step S1, the base portion is AZ31B magnesium alloy, the support leg portion is VW63Z magnesium alloy, the thermal conductivity threshold is 155W/(m·k), and the strength threshold is 385MPa.
4. The flywheel bracket manufacturing process according to claim 1, wherein in the step S1, the base portion is machined, and the support leg portion is machined by a laser selective fusion forming method.
5. The flywheel bracket manufacturing process according to claim 1, wherein in the step S4, a transition region is provided within a range of 5mm above a connection interface between the base portion and the support leg portion, and the transition region is formed by performing a laser selective melting process by using laser with power less than or equal to a preset power.
6. The flywheel bracket manufacturing process of claim 5, wherein the laser selective melting process parameters of the transition zone comprise a first thickness of the powder layer, a first power of the laser power, a first speed of the scanning speed, and a first distance of the scanning distance.
7. The flywheel bracket manufacturing process according to claim 6, wherein in the step S3, the machined base portion is mounted on a forming substrate of a laser selective melting forming apparatus; the transition zone is formed by preheating the substrate at a first temperature.
8. The flywheel bracket manufacturing process of claim 7, wherein the support leg above the transition zone is a non-transition zone; the laser selective melting process parameters of the non-transition region comprise that the powder spreading layer adopts a second thickness, the laser power adopts a second power, the scanning speed adopts a second speed, and the scanning interval adopts a second interval; Preheating the substrate at a second temperature during molding of the non-transition region; the first thickness is less than the second thickness, the first power is less than the second power, the first speed is greater than the second speed, the first spacing is greater than the second spacing, and the first temperature is greater than the second temperature.
9. The flywheel bracket manufacturing process according to claim 1, wherein in the step S4, before performing the laser selective fusion forming processing, vacuum drying is required to be performed on the powder, the powder drying temperature is a specific temperature, the powder drying time is a specific duration, and the processed metal powder is laid on a powder feeding platform of the laser selective fusion forming device; and slicing the supporting leg in layers by using layering software, and setting laser selective melting forming technological parameters.
10. The flywheel bracket manufacturing process according to claim 1, wherein in the step S5, the heat treatment includes: Carrying out solid solution treatment on the flywheel bracket blank at the temperature of 485 ℃ for 15 hours; After the solution treatment is completed, the flywheel bracket blank is subjected to aging treatment after heat preservation for 60 hours at the temperature of 200 ℃.

Description

Flywheel bracket manufacturing process method Technical Field The invention belongs to the technical field of metal additive manufacturing, and particularly relates to a flywheel bracket manufacturing process method, in particular to a magnesium alloy lightweight flywheel bracket and a manufacturing method thereof. Background The traditional satellite flywheel bracket material is generally prepared from low-density magnesium alloy by adopting a casting and machining process, and the weight reduction requirement is urgent. Although the flywheel bracket can realize structural weight reduction through topological lightweight design, the topological lightweight structure has complex geometric shapes and is difficult to manufacture through traditional processing technologies such as casting and the like. The laser selective melting additive manufacturing technology (SLM) can realize direct forming manufacturing of complex parts, and provides a manufacturing basis for light structure. The SLM forming technology can further introduce a light-weight structural design on the basis of light weight of the magnesium alloy material, and a double light-weight effect is generated. However, magnesium element is easy to burn and splash in the SLM forming process, defects such as pores and cracks in the SLM forming magnesium alloy are extremely difficult to control, magnesium alloy powder has extremely high chemical activity, and the SLM forming process has relatively high safety risk, so that development of a magnesium alloy SLM forming technology is severely restricted, and engineering application cases of the satellite flywheel bracket magnesium alloy SLM forming technology are rarely reported. In the using process of the flywheel bracket, heat can be continuously generated along with continuous working of the flywheel, and the heat conductivity of the VW63Z magnesium alloy formed by the SLM is only 31W/(m.K), which is far lower than that of magnesium alloys such as AZ31B, so that the flywheel bracket has heat accumulation risk in the using process. According to the functional requirements and structural characteristics of different areas of the flywheel bracket, different materials and different forming processes are selected, so that the design and preparation requirements of the flywheel bracket can be met. Patent document CN114060466B discloses a light vibration isolation metal composite flywheel bracket and a preparation method and application thereof, and belongs to the technical field of metal material structural design and processing. The metal composite flywheel bracket comprises a magnesium alloy bottom plate with light weight and high damping performance, a titanium alloy lattice sandwich flywheel mounting surface with a vibration buffering function, a titanium alloy supporting beam with high rigidity, and a light vibration isolation metal composite flywheel bracket prepared by a method combining metal block processing and metal 3D printing. The light vibration isolation metal composite flywheel bracket and the preparation method thereof have the advantages of small weight, high first-order vibration frequency, small amplification factor of a mounting surface, wide applicability, excellent performance and the like. However, the patent document CN114060466B does not carry out topological optimization design on the supporting leg of the flywheel bracket, the supporting beam and the mounting surface adopt titanium alloy materials with higher density, the weight reduction effect is not ideal, in addition, obvious differences exist between the physical characteristics of magnesium alloy and titanium alloy materials, and high risks exist in interface bonding. Disclosure of Invention Aiming at the defects in the prior art, the invention aims to provide a flywheel bracket manufacturing process method. The invention provides a flywheel bracket manufacturing process method, which comprises the following steps: S1, selecting materials and processing technology of a base part and a supporting leg part of a flywheel bracket based on the functional requirement of the flywheel bracket; s2, performing topological lightweight structural design on the flywheel bracket; s3, preparing a base part of the flywheel bracket by machining; s4, forming a supporting leg part and a mounting part of the flywheel bracket by using a laser selective melting forming method on the base part so as to form a flywheel bracket blank; S5, performing heat treatment on the flywheel bracket blank; and S6, machining the flywheel bracket blank to finally realize the manufacture of the flywheel bracket. Preferably, in the step S1, the base portion of the flywheel bracket is made of a magnesium alloy material having a thermal conductivity equal to or higher than a thermal conductivity threshold, and the support leg portion is made of a magnesium alloy material having a tensile strength higher than a strength threshold. Preferably, in the step S1, the base p