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.
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.
The machining process of the milling head box (unit: mm)
| Part Name | Blank species | Material | Production type |
|---|---|---|---|
| Lathe spindle box | casting | HT200 | Small batch |
| Process | Work step | Process content | Equipment | Tools, measuring tools, auxiliary tools |
|---|---|---|---|---|
| 10 | Casting | |||
| 20 | Aging | |||
| 30 | Oil primer | |||
| 40 | Scribe: ϕ150 + 0.025 inner hole, ϕ180 + 0.025 inner hole machining allowance should be as uniform as possible | Marking table | ||
| 50 | Rough milling | Vertical milling machine | ||
| 1 | Align by line, rough mill E surface | Disc cutter | ||
| 2 | Rough milling of C surface, leaving fine milling amount 2 | Disc cutter | ||
| 3 | Rough milling D surface, leaving fine milling amount 2 | Disc cutter | ||
| 4 | Rough milling of F surface, leaving fine milling amount 2 | Disc cutter | ||
| 60 | Milling, drilling | Vertical Machining Center | ||
| 1 | Finish milling F surface, remaining grinding amount 0. 30 | Disc cutter | ||
| 2 | Drill 4 × ϕ22 holes, surface roughness Ra6. 3μm | ϕ22 Twist drill | ||
| 3 | Countersink ϕ34 hole, surface roughness Ra6. 3μm | ϕ34 Countersink | ||
| 70 | Grind F surface to requirements, surface roughness Ra0. 8μm | Surface Grinder | ||
| 80 | Milling | Vertical Machining Center | ||
| 1 | Finish milling E surface to requirements, surface roughness Ra3. 2μm | Disc cutter |
| Process | Work step | Process content | Equipment | Tools, measuring tools, auxiliary tools |
|---|---|---|---|---|
| 2 | Drill 2 × M12 threaded bottom holes to ϕ10. 20 | ϕ10. 20 twist drill | ||
| 3 | Tap 2 × M12, 25 deep threaded holes | M12 thread tap | ||
| 90 | Milling, boring | Horizontal machining center | ||
| 1 | Finish milling C surface, surface roughness Ra0. 8μm | Disc cutter | ||
| 2 | Boring ϕ165 inner hole, surface roughness Ra3. 2μm | Rough boring tool | ||
| 3 | Rough boring ϕ180 + 0.025 inner hole to ϕ178 | Rough boring tool | ||
| 4 | Fine boring ϕ180 + 0.025 inner hole to request, surface roughness Ra0. 8μm | Fine Boring Tool | ||
| 5 | Boring ϕ192 + 0.072 inner hole to requirement, surface roughness Ra3. 2μm | Fine Boring Tool | ||
| 6 | Do not loosen the pressure plate, rotate 180° horizontally, finish milling D surface, surface roughness Ra3. 2μm | |||
| Disc cutter | ||||
| 7 | Boring ϕ138 + 0. 1 inner hole to the requirement, surface roughness Ra3. 2μm | Fine Boring Tool | ||
| 8 | Rough boring ϕ150 + 0.025 inner hole to ϕ148 | Rough boring tool | ||
| 9 | Fine boring ϕ150 + 0.025 inner hole to the requirements, guaranteed size 40, surface roughness Ra0. 8μm | |||
| Fine Boring Tool | ||||
| 100 | Test | Inspection station | ||
| 1 | Check the size and surface roughness of each part | |||
| 2 | Check the tolerance of coaxiality between the axis of ϕ150 + 0.025 and the axis of ϕ180 + 0.025 | |||
| 3 | Fill in the inspection report | |||
| 110 | Warehousing |