Original
By certification 
High Precision Heat Treatment 40Cr 8X139 Stepped Screw Thread Edging Punch Motor Rotor Steel Shaft
This is a car seat motor shaft with two double milling edges. The roundness requirement is 0.0025, the run-out requirement is 0.025, and the run-out requirement after double milling at the thread is 0.08.
Product Description | |||||||
Reminder: All products are customized products for customers, if you have customized requirements, please contact customer service | |||||||
Product Name |
shaft | Specifications |
8*139 |
Material |
40Cr |
Hardness |
28-32 |
Number |
Process |
Control Item |
Control Standard | ||||
10 |
Cutting |
length |
139 +1.2/+1.0 |
||||
Straightness |
↗0.03 |
||||||
20 |
Heat treatment |
Hardness |
HRC28-32 |
||||
30 |
Straightening |
Straightness |
↗0.03 |
||||
40 |
CNC turning |
||||||
50 |
Rolling |
thread |
M8*1.25 Rlight |
||||
60 |
Step grinder |
Outer diameter |
Ф8 +0.020/+0.015 |
||||
Outer diameter |
Ф8 -0.06/-0.08 |
||||||
Outer diameter |
Ф6.35 +0.005/0 |
||||||
70 |
Fine grinding |
outer diameter |
Ф8 +0.005/ 0 |
||||
Roundness |
0.0025 |
||||||
Roughness |
Ra0.8 |
||||||
Run-out |
↗0.0025 |
||||||
80 |
Milling Edge |
Thickness |
5.8 0/-0.1 |
||||
Thickness |
4 +0.1/-0.2 |
||||||
90 |
Punch |
4 Bars |
8 +0.11/+0.08 |
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