MODEL 3RMODEL 3RMODEL 3RMODEL 3R

ROCKWELL HARDNESS TESTER

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Basic equipment

Accessories

Diamond cone penetrator 1 piece

1/16” Steel ball penetrator 1 piece

1/16” steel ball 10 piece

Test block (HRC, HRB) 2 piece

Plane anvil 1 piece

V anvil (deep) 1 piece

Hardness conversion table 1 copy

Vinyl cover 1 piece

Case for the equipments 1 piece

Specifications

Body appearance dimensions H650 × L450 × W200 mm

Body weight (Net weight) 66 kg

(Gross weight) 94 kg

Shipping dimensions H1050 × L650 × W450 mm

Testing materials having the following height and width can be tested....

Height 200 mm

Length (from center) 138 mm

Option 1/8” Steel ball penetrator

1/4” Steel ball penetrator

1/2” Steel ball penetrator

Diamond spot anvil

Spot anvil： φ7.5mm Height 5mm

V anvil (Small)： φ5mm

IMAI TESTING MACHINE MFG. CO., LTDIMAI TESTING MACHINE MFG. CO., LTDIMAI TESTING MACHINE MFG. CO., LTDIMAI TESTING MACHINE MFG. CO., LTD

DIAMOND CONE HARDNESS TESTERDIAMOND CONE HARDNESS TESTERDIAMOND CONE HARDNESS TESTERDIAMOND CONE HARDNESS TESTER

ROCKWELL METHOD ROCKWELL METHOD ROCKWELL METHOD ROCKWELL METHOD ―――― MODEL 3R MODEL 3R MODEL 3R MODEL 3R

The Rockwell Hardness Tester is a simply constructed machine used for testing easily and quickly the hardness of materials ranging from the softest to the

hardest and boasting of its wide range. The impression marked on the surface of specimens minute, it can also be applied to test finished goods.

The Rockwell Hardness Number derived from the net increase in the depth of impression as the load on a penetrator is increased from a fixed minimum load

to higher load and then returned to the minimum load. The hardness number is directly read on the dial. When a tester is conducted the point is penetrated

with a minor load of 10 kg. load taken as the basic point for penetration of an indenter on the surface of a specimen.

The penetrator for the Rockwell Test include steel balls of several specified diameters and a diamond-spheroconical penetrator having an included angle of

120-deg. with a spherical tip having a radius of 60 kgf 0.2mm.

The test load (major load) is customarily 60 kgf(588.4N) or 100 kgf(980.7N) when a steel ball is used as a penetrator, but other loads may be used when

found necessary, and usually 150 kgf(1471N) when a diamond spheroconical penetrator is employed. The ball penetrator is 1/16” in diameter normally but

other penetrator of large diameter such as 1/8”, 1/4” or 1/2” may be employed for soft metals. Thus variety of loads and penetrators are provided and

experience decides the best combination for use.

kinds of the ROCKWELL HARDNESS Scales and their use

Scale

symbol penetrator

Major

load kgf

Dial

figures Typical application of scales

B 1/16” steel ball 100 Red Copper alloys, Soft steel, aluminum alloys, malleable iron etc.

such as ranging HRB 0-100.

C Diamond cone 150 Black

Steel, hard cast irons, pearlitic malleable iron, titanium deep

case hardened steel and other materials harder than HRB 100

and softer than HRC 70.

A Diamond cone 60 Black Cemented carbides, thin steel and shallow case hardened steel.

D Diamond cone 100 Black Thin steel and medium case hardened steel and pearlitic

malleable iron.

E 1/8” steel ball 100

F 1/16” steel ball 60 Red

Cast iron, annealed copper alloys, aluminum and magnesium

alloys, bearing metals and thin soft sheet metals.

G 1/16” steel ball 150 Red Phosphor bronze, beryllium copper, malleable irons, upper limit

HRG 92 to avoid possible flattening of ball.

H 1/8” steel ball 60

K 1/8” steel ball 150

L 1/4” steel ball 60

M 1/4” steel ball 100

P 1/4” steel ball 150

R 1/2” steel ball 60

S 1/2” steel ball 100

V 1/2” steel ball 150

Red. Bearing metals and other very soft or thin materials. Use

smallest ball and heaviest load that dose not give anvil effect.