Automotive

automotive

This is an automotive equipment housing of a French company,when we got the drawing,we have finished the sample within 3days, and the sample got the customer’s Praise,then we got the mass production order.

Example.Gear transmission box

skills requirement

1.Material: HT200.    2.Artificial aging treatment.    3.Unfilled cast fillet R2~R3

1.Part drawing analysis

1) In the figure, the inner hole of ϕ25H7 is parallel to the A surface, and the tolerance is 0.02mm; the B surface is parallel to the A, and the tolerance is 0.02mm.

2) The part material is HT200.

3) Artificial aging treatment.

2.Process analysis

1) The inner hole of ϕ25H7 is parallel to the A surface, and the tolerance is 0.02mm, and the B surface is parallel to the A, and the tolerance is 0.02mm. In order to ensure this requirement, first draw a line, rough mill A, and B, then finish mill A or grind A, ensure that the flatness tolerance of A is within 0.01mm, and then use A as the benchmark, rough boring then fine boring ϕ25H7 Inner hole.

2) When machining the ϕ18H7 inner hole and the ϕ14H8 inner hole, always use the A surface as the reference

Machining process of gear transmission box(Unit: mm)

Part NameBlank speciesMaterialProduction type
Gear transmission boxcastingHT200Small batch
ProcessWork stepProcess contentEquipmentTools, measuring tools, auxiliary tools
10Casting
20aging
30Oil primer
40Scribe: Note that the machining allowance of ϕ25H7 inner hole, ϕ18H7 inner hole, and ϕ14H8 inner hole should be as even as possibleMarking table
50Rough millingVertical milling machine
1Align according to the line, rough mill A surfaceDisc cutter
2rough mill B surfaceDisc cutter
3rough mill C surfaceDisc cutter
4rough mill D surfaceDisc cutter
60Milling, boring, drillingVertical Machining Center
1Finish milling A surface, surface roughness Ra1. 6μmDisc cutter
2Finish milling B surface, surface roughness Ra1. 6μmDisc cutter
3Drill ϕ18H7 inner hole to ϕ16, surface roughness Ra6. 3μmϕ16 Twist drill
4Fine boring ϕ18H7 inner hole to requirement, surface roughness Ra1. 6μmFine Boring Tool
5Drill 4 × ϕ7 holes, surface roughness Ra6. 3μmϕ16 Twist drill
6Countersink ϕ12 hole, surface roughness Ra6. 3μmϕ12 Countersink
70Milling, boringHorizontal machining center
1Finish milling C surface, surface roughness Ra6. 3μmDisc cutter
2Finish milling D surface, surface roughness Ra6. 3μmDisc cutter
3Rough boring ϕ25H7 inner hole to ϕ24Rough boring tool
4Fine boring ϕ25H7 inner hole to requirement, surface roughness Ra1. 6μmFine Boring Tool
5Boring ϕ30 inner hole to the requirement, surface roughness Ra3. 2μmFine Boring Tool
6Drill the inner hole of ϕ14H8 to ϕ12Horizontal machining centerϕ12 Twist drill
7Fine boring ϕ14H8 inner hole to requirements, surface roughness Ra1. 6μmHorizontal machining centerFine Boring Tool
8Boring the inner hole of ϕ20 to the requirement, guaranteeing size 3, surface roughness Ra3. 2μmHorizontal machining centerFine Boring Tool
80BenchworkBench
1Print mark: year, month, sequence number
2Cleaning, deburring, chamfering
90TestInspection station
1Check the size and surface roughness of each part
2Check the parallelism between the inner hole and the bottom surface of ϕ25H7
80BenchworkBench
1Print mark: year, month, sequence number
2Cleaning, deburring, chamfering
90TestInspection station
1Check the size and surface roughness of each part
2Check the parallelism between the inner hole and the bottom surface of ϕ25H7

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