Bewise Inc. www.tool-tool.com Reference source from the internet.
目前在做的是洛氏硬度試驗....
請問HRC和HRB的基準點有何不同?何故?
洛氏硬度有HRA,HRB,HRC,...,到HRV等許多種,主要差異是下壓的尖形材料(專有名詞叫Indenter)不同,有鑽石錐與鋼珠球等多種;此外,施加的負荷也不同.為什麼要這麼多種類?主要是用來量度從鑄鐵這樣硬脆的材料到塑膠這樣柔軟的材料,必須有不同的Indentor與下壓負荷.
下表是不同洛氏硬度的參數與使用時機.
Scale | Indenter | Minor Load F0 kgf | Major Load F1 kgf | Total Load F kgf | Value of E |
A | Diamond cone | 10 | 50 | 60 | 100 |
B | 1/16" steel ball | 10 | 90 | 100 | 130 |
C | Diamond cone | 10 | 140 | 150 | 100 |
D | Diamond cone | 10 | 90 | 100 | 100 |
E | 1/8" steel ball | 10 | 90 | 100 | 130 |
F | 1/16" steel ball | 10 | 50 | 60 | 130 |
G | 1/16" steel ball | 10 | 140 | 150 | 130 |
H | 1/8" steel ball | 10 | 50 | 60 | 130 |
K | 1/8" steel ball | 10 | 140 | 150 | 130 |
L | 1/4" steel ball | 10 | 50 | 60 | 130 |
M | 1/4" steel ball | 10 | 90 | 100 | 130 |
P | 1/4" steel ball | 10 | 140 | 150 | 130 |
R | 1/2" steel ball | 10 | 50 | 60 | 130 |
S | 1/2" steel ball | 10 | 90 | 100 | 130 |
V | 1/2" steel ball | 10 | 140 | 150 | 130 |
Typical Application of Rockwell Hardness Scales
HRA . . . . Cemented carbides, thin steel and shallow case hardened steel
HRB . . . . Copper alloys, soft steels, aluminium alloys, malleable irons, etc.
HRC . Steel, hard cast irons, case hardened steel and other materials harder than 100 HRB
HRD . . . . Thin steel and medium case hardened steel and pearlitic malleable iron
HRE . . . . Cast iron, aluminium and magnesium alloys, bearing metals
HRF . . . . Annealed copper alloys, thin soft sheet metals
HRG . . . . Phosphor bronze, beryllium copper, malleable irons
HRK . . . . }
HRL . . . . }
HRM . . . .} Soft bearing metals, plastics and other soft materials
HRP . . . . }
HRR . . . . }
HRS . . . . }
HRV . . . . }
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