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
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.
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 Name||Blank species||Material||Production type|
|Process||Work step||Process content||Equipment||Tools, measuring tools, auxiliary tools|
|40||Scribe: Ensure that ϕ52 + 0.025 has a machining allowance for the inner hole and is as uniform as possible||Marking table|
|1||Aligning according to the line, rough milling D surface, leaving the amount of fine milling 2||Vertical milling machine||Disc cutter|
|2||Rough milling of B side, leaving fine milling amount 2||Vertical milling machine||Disc cutter|
|3||Rough milling of E face, leaving fine milling amount 2||Vertical milling machine||Disc cutter|
|4||Rough milling of F surface, leaving fine milling amount 2||Vertical milling machine||Disc cutter|
|1||Finish milling D surface, surface roughness Ra3. 2μm||Vertical Machining Center||Disc cutter|
|2||Drill 4 × ϕ12 holes, surface roughness Ra3. 2μm||Vertical Machining Center||ϕ12 Twist drill|
|3||The countersink ϕ28 hole is formed, the guaranteed size is 15, the surface roughness is Ra3. 2μm||Vertical Machining Center||ϕ28 Countersink|
|4||Turn 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. 2μm||Vertical Machining Center||Disc cutter|
|5||Drill the M10 threaded bottom hole to ϕ8.5||Vertical Machining Center||ϕ8.5 Twist drill|
|6||Tap M10 threaded hole||Vertical Machining Center||M10 thread tap|
|1||Finish milling E surface, surface roughness Ra3. 2μm||Horizontal machining center|
|2||Rough boring ϕ52 + 0.025 inner hole to ϕ50||Horizontal machining center||Rough boring tool|
|3||Fine boring ϕ52 + 0.025 inner hole to request, surface roughness Ra0. 8μm||Horizontal machining center||Fine Boring Tool|
|4||Do not loosen the pressure plate, rotate 180° horizontally, finish milling F surface, surface roughness Ra3. 2μm||Horizontal machining center|
|1||Check the size and surface roughness of each part|
|2||Inspection ϕ52 + 0.025 Tolerance of axis coaxiality of two inner holes|
|3||Fill in the inspection report|