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As an important part of the spacecraft thermal control protection system, the thermal control coating is like the skin of the human body, protecting the spacecraft from operating in various complex space environments.It is of great significance to ensure the normal operation of various parts and structures inside the spacecraft.

 

The performance of the thermal control coating mainly depends on the surface characteristics of the coating. The most important parameters are the solar absorption ratio αs and the hemispheric emission rate £H.Each material has a specific solar absorption ratio and hemispherical emissivity, and theoretically can be applied to a certain thermal environment to achieve a certain thermal control function.But the actual situation is: a single material often cannot meet the design requirements of spacecraft in terms of heat radiation performance, mechanical properties, specific gravity, and cost.For example, aluminum alloy is the most commonly used material in spacecraft. It has the advantages of low specific gravity, high strength, and relatively low cost. However, in some parts of stars and ships, the heat radiation performance of aluminum alloy cannot meet the demand.From the comprehensive consideration of thermal performance, mechanical performance, cost and other aspects, the best solution is to cover the surface with a layer of material with the required thermal radiation performance, that is, a thermal control coating, so as to achieve a balanced combination of multiple properties.

Example . Small sleeve

skills requirement

1.Material: 45 steel.     2.Hole and external round chamfer C1.     3.Quenching 30~35HRC.     4.Blue treatment.

1.Part drawing analysis

1)The part material is 45 steel.

2)Quenching 30 ~ 35HRC.

3)Blue treatment.

4)The coaxiality tolerance of ϕ57 + 0.05 outer circle and ϕ40 + 0.025 inner hole is ϕ 0. 01mm.

 

2.Process analysis

To ensure that the coaxiality tolerance of ϕ57 + 0.05 outer circle and ϕ40 + 0.025 inner hole is ϕ 0. 01mm, the machined parts

At this time, it is necessary to turn and machine ϕ57 + 0.05 outer circle and ϕ40 + 0.025 inner hole after clamping once.

sleeves Machining process

Part NameBlank speciesMaterialProduction type
Small sleeveRound steel45 # steelSmall batch
ProcessWork stepProcess contentEquipmentTools, measuring tools, auxiliary tools
10Blanking ϕ 75 × 120Sawing machine
20Rough turningHorizontal lathe
1Use the self-centering chuck to clamp the outer circle of the blank, align, clamp, turn the end face, and turn it flat.45° elbow turning tool
2Drill ϕ20 hole to ϕ19 through holeϕ19 Twist group
3Boringϕ40 + 0. 025hole to ϕ38, depth 84Closed hole boring tool
4Turning ϕ57 + 0. 052 outer circle to ϕ59, as long as ϕ70 to the end face, leaving a margin of 190° external turning tool
5Turning ϕ55 outer circle to size ϕ57, length to ϕ57 + 0. 052 end face90° external turning tool
6Turn around. Use a self-centering chuck to clamp the outer circle of ϕ55, align, clamp, and turn the outer circle of ϕ70 to ϕ7290° external turning tool
7Turning the left end face completed45° elbow turning tool
30Heat treatment: quenching 30 ~ 35HRCSalt bath furnace
40Fine turningCNC lathe
1Use the self-centering chuck clamp ϕ70 to align, clamp, and turn the end face at the outer circle to keep the total length and allowance 145° elbow turning tool
2Semi-finished turning ϕ57 + 0.052 outer circle to 57.8, as long as ϕ70 end face, flat end face to the requirements90° external turning tool
3Turning ϕ55 outer circle to the requirement, guaranteed length 5590° external turning tool
4Finish turning ϕ57 + 0. 052 outer circle to the requirements, guaranteed size 50, surface roughness Ra0. 8μm90° external turning tool
5Boring ϕ40 + 0.025 inner hole to ϕ39.2, depth 85Closed hole boring tool
6Turning inner hole slot 4 × 1Internal groove turning tool
7Fine boring ϕ40 + 0.025 inner hole to request, depth 81, surface roughness Ra0. 8μmFine Boring Tool
8Face chamfer C145° elbow turning tool
9Turn around. Use self-centering chuck clamp ϕ55 to align the outer circle, clamp, and turn the end face to ensure the total length 11545° elbow turning tool
10Turning ϕ70 outer circle to requirement45° elbow turning tool
11Boring ϕ20 holes to requirementsBoring tool
12Turning hole chamfer C145° elbow turning tool
50TestInspection station
60Heat treatment: bluing treatment
70wrap up and warehousingWarehouse

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