Nautical Industry

This customer is from Germany company that major business in Nautical Industry, this is Shenzhen Invech Precision with this customer’s first case, then we have many stainless steel parts for the Nautical field.

 

Ship

Example . Spindle box of lathe

skills requirement

1.Material: HT200.2.Artificial aging treatment.3.No casting fillet R5-R10.

1.Part drawing analysis

1) In Fig. 9-7, the coaxial tolerance of the axis of ϕ150 + 0.025 and the axis of ϕ180 + 0.025 is ϕ0.01mm.

2) ϕ150 + 0.025 inner hole, ϕ180 + 0.025 inner hole axis and F surface parallelism tolerance is 0.01mm.

3) The part material is HT200.

4) Artificial aging treatment.

2.Process analysis

1) When processing, firstly process F surface, and then process ϕ150 + 0.025 inner hole and ϕ180 + 0.025 inner hole based on F surface. When boring these two holes, the machining should be completed in one clamping to ensure the coaxiality of the two inner holes.

2) ϕ150 + 0.025 inner hole, ϕ180 + 0.025 inner hole requires high precision, which requires fine boring.

Ship industry

The machining process of the milling head box (unit: mm)

Part NameBlank speciesMaterialProduction type
Lathe spindle boxcastingHT200Small batch
ProcessWork stepProcess contentEquipmentTools, measuring tools, auxiliary tools
10Casting
20Aging
30Oil primer
40Scribe: ϕ150 + 0.025 inner hole, ϕ180 + 0.025 inner hole machining allowance should be as uniform as possibleMarking table
50Rough millingVertical milling machine
1Align by line, rough mill E surfaceDisc cutter
2Rough milling of C surface, leaving fine milling amount 2Disc cutter
3Rough milling D surface, leaving fine milling amount 2Disc cutter
4Rough milling of F surface, leaving fine milling amount 2Disc cutter
60Milling, drillingVertical Machining Center
1Finish milling F surface, remaining grinding amount 0. 30Disc cutter
2Drill 4 × ϕ22 holes, surface roughness Ra6. 3μmϕ22 Twist drill
3Countersink ϕ34 hole, surface roughness Ra6. 3μmϕ34 Countersink
70Grind F surface to requirements, surface roughness Ra0. 8μmSurface Grinder
80MillingVertical Machining Center
1Finish milling E surface to requirements, surface roughness Ra3. 2μmDisc cutter
ProcessWork stepProcess contentEquipmentTools, measuring tools, auxiliary tools
2Drill 2 × M12 threaded bottom holes to ϕ10. 20ϕ10. 20 twist drill
3Tap 2 × M12, 25 deep threaded holesM12 thread tap
90Milling, boringHorizontal machining center
1Finish milling C surface, surface roughness Ra0. 8μmDisc cutter
2Boring ϕ165 inner hole, surface roughness Ra3. 2μmRough boring tool
3Rough boring ϕ180 + 0.025 inner hole to ϕ178Rough boring tool
4Fine boring ϕ180 + 0.025 inner hole to request, surface roughness Ra0. 8μmFine Boring Tool
5Boring ϕ192 + 0.072 inner hole to requirement, surface roughness Ra3. 2μmFine Boring Tool
6Do not loosen the pressure plate, rotate 180° horizontally, finish milling D surface, surface roughness Ra3. 2μm
Disc cutter
7Boring ϕ138 + 0. 1 inner hole to the requirement, surface roughness Ra3. 2μmFine Boring Tool
8Rough boring ϕ150 + 0.025 inner hole to ϕ148Rough boring tool
9Fine boring ϕ150 + 0.025 inner hole to the requirements, guaranteed size 40, surface roughness Ra0. 8μm
Fine Boring Tool
100TestInspection station
1Check the size and surface roughness of each part
2Check the tolerance of coaxiality between the axis of ϕ150 + 0.025 and the axis of ϕ180 + 0.025
3Fill in the inspection report
110Warehousing

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