Portable simple mold strength measurement
Compressive Strength Meter for Green Sand Mold
NK-406
- It can measure the compressive strength of molded green sand. *compressive strength: load per unit area (kg/m2 ) when a material is destroyed at compression test
- It can easily measure the strength of narrow surfaces.
- Contribution to quality improvement.
Feature
Successor to NK-405
N-405 is discontinued.
Unit of measurement
Changed to N/cm2(May.2023).
A simplified version of Universal Molding Sand Strength Tester.
Laboratory
■Universal Molding Sand Strength Tester： NKU
Work sites
■NK-406
Mold hardness measurement after molding
Selection of molding conditions (squeeze pressure and number of jolts)
Batteries
Measuring method of green sand mold strength
- Insert the needle slowly into the surface of the mold at a right angle.
- Keep inserting the needle until it touches the stopper. The digital figure is then displayed.
Data obtained by this tester is similar to those obtained by the standard molding sand strength tester.
| correct | Incorrect |
|---|---|
 |
 |
conversion table (pressure resistance)
| N/cm2 | kgf/cm2 |
|---|---|
| 0.0 | 0.0 |
| 9.8 | 1.0 |
| 19.6 | 2.0 |
| 29.4 | 3.0 |
| 34.3 | 3.5 |
Defects caused
Excessive compressive strength
| blow hole | misrun | cold shot | rat tail | hot tear | veining | sticker |
Insufficient compressive strength
| dirt | inclusion | scab | erosion | penetration | |
| rough casting surface | mold drop | push up | broken mold | shrinkage | sand burning |
Insufficient kneading
| blow hole (Improvement of kneading method is also necessary) |
dirt | 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-406 ]
| Display Unit | N/cm2 ( Can be changed to kgf/cm2 for a fee. ) |
|---|---|
| Measuring range | 0.00～34.3 N/cm2 (stroke: 3.5mm) |
| Resdution | 1 digit： 0.01N/cm2 (Or 0.01kgf/cm2) |
| Displey | LCD display ( 3 digits ) with peak hold |
| Operating temp | 0～40℃ |
| Storage temp | -10～60℃ |
| Measuring direction | Downward ( Others directions may cause a malfunction) |
| Battery | CR2032 × 1 |
| Battery life | 1 year *Included battery is a sample |
| Data Output | Digimatic output |
| Indentor shape |
|
| Size | H140 × W60 × D34 mm |
| Weight | 230 g |
Related product
NK-009Hardness Tester for Self-Hardening Mold
NK-021Hardness Tester for Green Sand Mold 
