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Military Defense

Teflon  Polytetrafluoroethylene (PTFE) can be machined through compression or extrusion molding,it also can be made into an aqueous dispersion for coating, impregnation, or fiber. PTFE is widely used as a high and low temperature resistant, corrosion resistant material, insulating material, anti-sticking coating, etc. in the industries of atomic energy, aerospace, electronic, electrical, chemical, machinery, instrument, construction, textile, food, etc.

Polytetrafluoroethylene also called Teflon\PTFE\PTFE board\F4, etc. Generally known as “non-stick coating” or “easy clean wok material” 。Teflon is a synthetic polymer material that uses fluorine to replace all hydrogen atoms in polyethylene. This material Resistant to acid, alkali, and various organic solvents,which is almost insoluble in all solvents. At the same time, PTFE  is resistant to high temperatures and because of its low coefficient of friction, it can be used for lubrication, besides it is also an ideal coating for easy cleaning wok and water pipe inner layer.

Example . Internal gear sleeve

skills requirement

1.Material: 40Cr steel.     2.Heat treatment: quenching and tempering 235HBW.

1.Part drawing analysis

1) The material of the parts is 40Cr steel.

2) Based on the center line of the inner hole of ϕ180H7, the coaxiality tolerance of ϕ165H7 inner hole, ϕ220h8 outer circle and ϕ200h9 outer circle to ϕ180H7 inner hole is ϕ0.02mm.

2.Process analysis

1) The tooth part of the inner gear sleeve is in the middle part, which is difficult to process.

2) The ϕ180H7 inner hole and the ϕ165H7 inner hole require high dimensional accuracy and high surface quality. When grinding, choose a suitable grinding wheel and a reasonable cutting amount.

Machining process of inner gear sleeve (unit: mm)

Part NameBlank speciesMaterialProduction type
Inner gear sleeveForging40Cr steelSmall batch
ProcessWork stepProcess contentEquipmentTools, measuring tools, auxiliary tools
10Forging: The forging is a hollow cylinder with an inner diameter of ϕ100
20Rough turningHorizontal lathe
1Use a self-centering chuck to clamp one end of the outer circle of the blank, align, clamp, and turn the end face to be flat45° elbow turning tool
2Boring each inner hole to ϕ145Boring tool
3Turn each outer circle to ϕ22590° external turning tool
30Heat treatment: tempering 235HBWBox furnace
40Fine turningCNC lathe
1Use a self-centering chuck to clamp the outer circle that has been turned, aligning, clamping, and turning the end face to make it smooth35° turning tool
2Turning ϕ220h8 outer circle, leaving grinding allowance 0. 3035° turning tool
3Turning ϕ180H7 inner hole, leaving grinding allowance 0.4035° turning tool
4Turning 10 × ϕ182 grooves, surface roughness Ra3. 2μmGrooving knife
5Turning ϕ150. 36H12 inner hole, surface roughness Ra3. 2μm35° turning tool
6Turning inside and outside circles, chamfering is completed35° turning tool
7Drilling and tapping 2 × M12, threaded holes are completedThread tap M12
8Turn around. Use a self-centering chuck clamp ϕ220h8 outer circle, aligning, clamping, turning left end surface leaving a grinding amount 0. 1035° turning tool
9Turning ϕ200h9 outer circle, leaving grinding allowance 0. 3035° turning tool
10Turning ϕ168 inner hole, surface roughness Ra3. 2μm35° turning tool
11Turning ϕ165H7 inner hole, leaving grinding allowance 0.4035° turning tool
12Turning inside and outside circles, chamfering is completed35° turning tool
50The left end surface is flat ground, surface roughness Ra3. 2μmSurface Grinder
60Grind the outer circleCylindrical grinder
1The nut and compression mandrel is aligned according to the outer circle of ϕ220h8, and the outer circle of ϕ220h8 is ground, and the surface roughness is Ra0. 8μm
2Grinding ϕ200h9 outer circle, surface roughness Ra1. 6μm
3Grinding size 35, left surface finished
70Grind the inner holeInternal grinder
1Use the self-centering chuck to clamp the outer circle of ϕ220h8, and align the left end ϕ220h8 outer circle and size 35 on the left to 0.01, and grind the inner hole of ϕ165H7, surface roughness Ra0. 8μm
2Turn around. Use the self-centering chuck to clamp the outer circle of ϕ200h9, align the outer circle of ϕ200h9 0.01, grind the inner hole of ϕ180H7, and surface roughness Ra0. 8μm
80Gear shaping: align according to the outer circle of ϕ200h9, press the right end face with a pressure plate,gear shaping completedGear shaperM5 gear shaper
90Inspection: ϕ180H7 inner hole, ϕ165H7 inner hole size and coaxiality of the two holesInspection station
100Oiling, packaging, warehousingWarehouse

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