HOME„Molding Sand Quallity Control > Hardness Tester for Green Sand Mold / NK-021

Portable simple mold hardness measurement
Hardness Tester for Green Sand Mold
NK-021

    • Density of green sand mold can be adjusted from the test results.
    • Contribution to quality improvement.
    • A limiter is provided for setting an allowance range of hardness.
    • Peak pointer (red pointer) is provided to indicate the maximum measurement.
    • The scale is divided into colored zones for easy reading.

Feature

Mold hardness measurement after molding

Selection of molding conditions (squeeze pressure and number of jolts)

Batteries

Hardness test method

  1. Use a test mold with a flat test surface accompanied with an opposing surface which is also flat and parallel to the test surface.
  2. Hold the tester securely of 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.
correct Incorrect


conversion table

Scale color Rammed sand mold condition Load value
Very soft `20
Soft 20`35
Normal 35`60
Hard 60`75
Very hard 75`

 

Defects caused

Excessive hardness

blow hole misrun cold shot rat tail hot tear veining sticker

Insufficient hardness

dirt inclusion scab erosion penetration
rough casting surface mold drop push up broken mold shrinkage

Insufficient kneading

blow hole
(Improvement of kneading method is also necessary)		 dirtC inclusion scab erosion
sticker mold drop push up broken mold shrinkage

Calibration

Calibration at custody (Recommended one a year)

Calibration certificate, Traceability system diagram, inspection report, etc.

Specification [ Type : NK-021 ]

Type Peak pointer type
Load value 1.030 - 2.324 N (105 - 237 gf)
Indentor shape 5.08 mm (hemisphere)
Measuring direction Downward ( Others directions may cause a malfunction)
Limiter ±5 scale
Size H108 × W60 × D22 mm
Weight 190g
* Read the usage carefully and use the device properly

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