β of exterior quality coefficient

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The β of all sorts of aggrandizement methods machines the β of different face surface roughness μ of Ra(of methodological surface surface roughness) low stress of axis of B(MPa) light of σ of intensity of core of method of aggrandizement of σ B (MPa) centers K σ ≤ 1.

5 tall stress center K σ > 1.

Thick car of 54008001200 grinding turning is raw face 0.

4 ～ 0.

23.

2 ～ 0.

825 ～ 6.

3 ～ 10.

950.

850.

7510.

900.

800.

6510.

800.

650.

45 high frequency quench 800800 ～ of 600 ～ 10001.

5 ～ 1.

71.

3 ～ 1.

51.

6 ～ 1.

72.

4 ～ 2.

8 nitrogen change 900 ～ 12001.

1 ～ 1.

251.

5 ～ 1.

71.

7 ～ 2.

11.

High frequency quenched test specimen diameter 10 ～ 20mm, hard ply of temper by dipping in water 0.

05 ～ 0.

2mm. To large size part, β is reduced somewhat. 2.

Nitrogen changes a ply 0.

Little value is used when 01d, in 0.

03 ～ 0.

Great value is used when 04d. 3.

The β of gush bolus sclerosis, little value is used when gush bolus rate is low. Cementite 600700 ～ of 400 ～ 8001000 ～ 12001.

8 ～ 2.

01.

4 ～ 1.

51.

2 ～ 1.

332 gush bolus handles 600 ～ 15001.

1 ～ 1.

251.

5 ～ 1.

61.

7 ～ 2.

1 roller boils press 600 ～ 15001.

1 ～ 1.

31.

3 ～ 1.

51.

6 ～ 2.

In the fresh water of B (MPa)4005006007008009001000120013001400 of σ of β work requirement below 0 burn-in condition, stress is centered 0.

70.

630.

560.

520.

460.

430.

400.

380.

350.

In 33 fresh water, stress-free centers seawater in, stress is centered 0.

580.

50.

440.

370.

330.

280.

250.

230.

200.

In 19 seawater, stress-free is centered 0.

370.

30.

260.

230.

210.

180.

160.

140.

120.

12 CNC Milling CNC Machining