Service Hotline:
13531819128
0760-22824807
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1. Processing range (the original state of the workpiece):
Workpiece status | Processing conditions | Remarks |
Valve head diameter | Within MAX 50㎜ | |
Stem diameter | φ 5～9㎜ | |
Length | 80～250㎜ | |
Material quality | 21-4N+4Cr10Si2Mo | Import: SUH: 3, SUH: 35, etc |
Hardness | 30—60HRc | |
Stem run-out | 0.01㎜ | |
Valve head surface run-out | 0.1㎜ |
2. Processing accuracy and cycle time:
Position | Accuracy | Test methods and tools |
Quenched length | Continuously process and measure 50 pieces within ± 1.5 mm. | Special measuring tool |
Quenched hardness dispersion | Continuously process and measure 50 pieces≤6.0HRC. | Special gauge tool & vernier caliper |
Cycle time | Take machining allowance of stem diameter 6.2 as the standard - 6s/pc. |
