Determine the cutting parameters and machining allowance of each process of spiral bevel gear

1.Axle neck and back cone

Since the whole part is machined as an outer round end face, all journals can be turned once, and the machining allowance of all journals is the same. Now the journal is taken as an example to show the machining allowance of all journals.

Determine process size and allowance:

Rough lathing : 65.5mm;

Fine lathing :

Process dimension table

Procedure name	Allowance between processes / mm	Interprocess		Interprocess size/mm	Interprocess
		Economic accuracy /μm	Surface roughness / μm		Dimensional tolerance / mm	Surface roughness / μm
Fine lathing	0.5	H9	Ra6.3	66		Ra6.3
Rough lathing	1	H12	Ra12.5	68		Ra12.5

 

2. Processing 5 mm hole

The blank is solid, but the hole has no accuracy requirement, so only drilling can be done. (refer to table 2.3-9 and table 2.3-12 of the brief Manual of mechanical manufacturing process design) to determine the process size and allowance:

Drilling hole Φ 5mm;

Process dimension table

Procedure name	Allowance between processes / mm	Interprocess		Interprocess size/mm	Interprocess
		Economic accuracy /μm	Surface roughness /μm		Dimensional tolerance / mm	Surface roughness /μm
Drill hole	5	H12	Ra12.5	5	—	Ra12.5

3 Machining thread

The thread parameter is m27x1.5-6h, to determine the process size and allowance:

Process dimension table

Procedure name	Allowance between processes / mm	Interprocess		Interprocess size/mm	Interprocess
		Economic accuracy /μm	Surface roughness / μm		Dimensional tolerance / mm	Surface roughness / μm
Fine lathing spiral	0.16	6h	Ra6.3	26.68		Ra6.3
Rough lathing spiral	0.80	8h	Ra12.5	25.08		Ra12.5