NAKAYAMA
Co.,Ltd.
009
This mold hardness tester can be directly applied to molds as
manufactured on the casting floor from furan sand, phenolsand, CO2 sand, or shell molding sand.
Simple and portable mold hardness tester for easy on-floor-testing.
Density of self-hardened molds can be adjusted from the test results.
Great contribution to high quality products.
A limiter is provided for setting an allowance range of hardness.
A red hand is provided to indicate the maximum measurement.
Size：(H123×W55×D24mm)

Weight：About 160g

406This tester measures green sand compression strength in kg/cm2
as manufactured on the casting floor. It can be applied to a wide
flat mold surface as well as to a narrow mold surface.
The conventional test pieces used on universal strength
testers are not necessary.
Compressive strength can be obtained directly frommolds (cope or drag) as produced.
Size：(H140×W60×D34mm)

Weight：About 230g021
This is an easy-to-use green sand mold hardness tester applied togreen sand mold surface as manufacture on the floor.

Specifications
TypeNK-021(stay-in-place needle)
Spring Load 1.030N-2.324N(105gf-237gf)
Press Needle 5.08mm(hemispheric)Size：(H108×W60×D22mm)

Relationship between Hardness andSand Mold Condition
Hardness Reading
Mold Condition
to 20
Very soft rammed sand moldfrom 20 to 35
Soft rammed sand moldfrom 35 to 60
Normal rammed sand moldfrom 60 to 75
Hard rammed sand mold
75 and up
Very hard rammed sand mold
Weight：About 190g

009
Set a mold surface horizontally. Hold the tester securely with hand and lower it vertically at a constant
speed pressing it on the mold surface. The maximum value is read immediately after the contact. Measurement made askew or upward or on a vertical surface may lead to erroneous results. Though the testing
method is simple, care must be exercised for stable measurement;
Use a test mold with a flat test surface accompanied with an opposing surface which also is flat andparallel to the test surface.
Stand upright and try to lower the tester at a speed as constant as possible. Normally the maximum
value is read. However, the value after a certain time from the moment of contact may be used insome cases. In such a case, the value may depend on the time, particularly when the indication
decreases with time during contacting.

406
Insert the needle slowly into the surface of the mold Green Mold Compressive Strength Data Logging System
at right angle.
Keep inserting the needle until touching the stopper. The displayed digital figure is then read off.
Data obtained by this tester is similar to thoseobtained by the standard molding sand strength
tester.

Interface
PC for data logging

Data chart
This system automatically saves measured
data of green mold compressive strength.

The precision of this hardness tester has been calibrated in the upright position. In other positions certain
errors could occur in the mechanism of the tester.Ensure to use the tester only in the upright position.
For measurement,hold the hardness tester firmly in the hand and press it at a constant speed verticallywith the flat surface of the tester parallel to the sand mold surface. As soon as the flat surface comes in directcontact with the sand mold surface, read the indicated maximum value. Mote that measurement in tilted orhorizontal directions involves inaccuracy. The hardness tester is equipped with limiters to define the upper
and the lower tolerance.If a hardness range of 50±5 is defined,for example ,you can set the limiters to theupper limit(55) and the lower limit(45),so that you can confirm easily that the measured values are within
the tolerance. The hardness tester has also a (red) stay-in-place needle to show the maximum value of eachmeasurement.Follow the procedures below for setting and reading.
Turn the kno in the middle of the scale counterclockwise and position the red stay-in-place needle
near the 0-position.
Make measurements in this condition. When the flat surface of the hardness tester is released fromthe specimen,the indicator returns to 0 with the stay-in-place needle showing the maximum
value(the highest hardness indicated).

NAKAYAMACo.,Ltd.
■ Haed Office 3-37-22 Kodama, Nishi-ku, Nagoya-City 451-0066 Japan
Tel:+81-52-521-1171 Fax:+81-52-521-1180
E-mail: info@nakayama-meps.co.jp

January, 2013 2nd edition
April, 2016 3rd edition■ Website; http://www.nakayama-meps.co.jp/■ Eastern Japan business officeTel: +81-24-545-6588 Fax: +81-24-544-6588