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This case is from Netherlands customer that with many Strict requirements on the quality, we have made a sample first .then we have made several Medical other cases that also with the Same difficulty.

Example . Cabinet

skills requirement

1.Material: HT150.    2.All chamfer C2.    3.No rounded corners R2~R5.

1. Part drawing analysis

 1) The axis coaxiality tolerance of  ϕ52 + 0. 025 the two inner holes in Figure 9-8 is ϕ0. 005mm.

2) The part material is HT150.

3) Artificial aging treatment.

2.Process analysis

1) The axes of the ϕ52 + 0. 025 two inner holes are coaxial. In order to ensure this requirement, first draw a line, and rough mill the D and B surfaces.

Then finish milling the D surface or grind the D surface to ensure that the flatness tolerance of the D surface is within 0.01mm, and then use the D surface as the reference to fine boring the ϕ52 + 0. 025 inner hole.

2) When machining ϕ52 + 0. 025  inner holes, rough and fine boring are required.

The machining process of the box body (unit: mm)

Part NameBlank speciesMaterialProduction type
BoxcastingHT150Small batch
ProcessWork stepProcess contentEquipmentTools, measuring tools, auxiliary tools
10Casting
20Aging
30Oil primer
40Scribe: Ensure that ϕ52 + 0.025 has a machining allowance for the inner hole and is as uniform as possibleMarking table
50Rough milling
1Aligning according to the line, rough milling D surface, leaving the amount of fine milling 2Vertical milling machineDisc cutter
2Rough milling of B side, leaving fine milling amount 2Vertical milling machineDisc cutter
3Rough milling of E face, leaving fine milling amount 2Vertical milling machineDisc cutter
4Rough milling of F surface, leaving fine milling amount 2Vertical milling machineDisc cutter
60Milling, drilling
1Finish milling D surface, surface roughness Ra3. 2μmVertical Machining CenterDisc cutter
2Drill 4 × ϕ12 holes, surface roughness Ra3. 2μmVertical Machining Centerϕ12 Twist drill
3The countersink ϕ28 hole is formed, the guaranteed size is 15, the surface roughness is Ra3. 2μmVertical Machining Centerϕ28 Countersink
4Turn it over, take the D surface as the reference, press it with a pressing plate, and finish milling the B surface. The surface roughness is Ra3. 2μmVertical Machining CenterDisc cutter
5Drill the M10 threaded bottom hole to ϕ8.5Vertical Machining Centerϕ8.5 Twist drill
6Tap M10 threaded holeVertical Machining CenterM10 thread tap
70Milling, boring
1Finish milling E surface, surface roughness Ra3. 2μmHorizontal machining center
Disc cutter
2Rough boring ϕ52 + 0.025 inner hole to ϕ50Horizontal machining centerRough boring tool
3Fine boring ϕ52 + 0.025 inner hole to request, surface roughness Ra0. 8μmHorizontal machining centerFine Boring Tool
4Do not loosen the pressure plate, rotate 180° horizontally, finish milling F surface, surface roughness Ra3. 2μmHorizontal machining center
Disc cutter
80TestInspection station
1Check the size and surface roughness of each part
2Inspection ϕ52 + 0.025 Tolerance of axis coaxiality of two inner holes
3Fill in the inspection report
90Warehousing

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