Apparatus for green sand quality control

NAKAYAMACo.,Ltd.

Digital Permeability Tester

NKPfor molding sand● Calculation of standard method isunnecessary● Standard table (quick comparison) inquick method is unnecessary● The adjustment of the Borehole isunnecessary● A water tank is unnecessary
Unlike conventional products, water is
unnecessary.
Method for measurement: Make TP(Tampdown three times). Fit it in the predetermined position.
（NKP-V3）※※

The image shows a small orifice function (optional)
The image is under development(Measurement example)

This apparatus is for quick and precise measurement of permeability of green
sand mold, dry sand mold, and other sand molds following the standard set by
the molding sand research committee of Japan Foundrymen's Society (NIK).
■specification
Type NKP-V3

sold separately

Size H300 × W280 × D400 mm
Weight about 17kg

Inspection jig

monitor Touch panel

Sand cylinder

Power supply AC 100V
Option RS232 communication possible
Dedicated application

Pump

Dry sand test tubeTool

NKP

Digital Permeability Tester for sand casting moldHow to use the tester
Quick method
Place the tester on a horizontal base. Asand test piece is packed in a test
cylinder, inserted in the tester together
with the cylinder, and sealed with arubber plug to prevent air leak.

迅速法

Table.1 The relation between air pressure and permeability
Use the small orifice for medium to fine sand grains.
Use the large orifice for medium to coarse sand grains.

Then, the start button is pushed tostart the measurement.

● small orifice60

Quick method ( small orifice ) *option②

Next, 1. Select the orifice type,

permeability①

As before, insert firmly into the "rubberstopper" so that no air leaks out.

502.Press the start button.

4030
20

Then measurement starts.

10Standard method

0Permeability

V×H
P×A×T

100

400

500 600 700
pressure (Pa)800

900 1000● large orifice(P = Pa ÷ 98)

A= sectional area of the specimen (A=19.635cm2)
H= height of the specimen (cm) (5.0 ± 0.1cm)

2500

permeability

P = pressure difference between the upper side and lower side of the specimen (Pa)

2000
1500

T = time necessary for the air of 2000cc to pass the specimen (min).

1000

Orifice measurement

500

Time necessary for discharging air of 2000cc

3003000

V= air volume passed through the test piece (cc) 2000cc

Air pressure in chamber

200

Large orifice: 30s＝ Small orifice: 4m30s(allowance: 2%)0100 200 300 400 500 600 700 800 900 1000
pressure (Pa)sold separately
Testing of dry sand mold

Permeability test of mold surface

A standard specimen (50mm in diameter and 50mm in height) is
prepared with a sand rammer and is taken out with a push rod for drying. A
weak specimen is taken out on a disc of 50mm diameter and sent to drying
on the disc.

For measuring permeability of formed sand molds or formed
cores, the receiving end of a rubber tube is connected to the testerat the “rubber plug” using a part in the options. The other end of
the rubber tube is pushed against the test piece surface. Thentesting is proceededed in the same way as in the measurement of
test pieces in the test cylinder.

The specimen is dried at 105 to 115 degree C for one to two hours andtaken out for cooling. After cooling, it is inserted in a dry sand permeability
specimen cylinder. The valve on the cylinder is opened and air is sent fromthe rubber bulb to the rubber sheath in the cylinder for ensuring pressuretight support of the specimen. The cylinder is inserted into the rubberstopper, and permeability is measured in the same way as the case of thegreen sand.

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: nk-1972@nakayama-meps.co.jp

This way of testing is not as precise as that of the proper testing
using a test piece in the cylinder, yet is convenient in accessing
permeability of already formed molds.

Sep, 2016 1st edition
May, 2024 2nd edition■ Website; https://www.nakayama-meps.co.jp/■ Eastern Japan business officeTel: +81-24-545-6588 Fax: +81-24-544-6588