NAKAYAMA
Co.,Ltd.

Apparatus for green sand quality control

Sand Rammer for Sand Specimen

NKR
This apparatus is for preparing specimens forpermeability test and strength test following thestandard set by the molding sand research committee of Japan Foundrymen's Society (NIK). It
consists of a base, a weight, a ramming rod, anda crank.
The crank lifts up the weight before dropping
it. The dropped weight hits down the ramming
rod which slides in a sand cylinder fixed to thebase. The sand in the cylinder is rammed to aspecified dimension with a constant energy.

Sold separately

Attachments

1. Sand cylinder
Sieve

Sand charger

3. Sand push rod

2. Sand cylinder receptacle

NKR

Sand Rammer for Sand Specimen

1 Preparation of strength test pieces

2 Preparation of permeability test pieces

A sand cylinder is inserted in a receptacle to the depth of about 15mm and held by hand. 140 to 175 g of the sand to be tested is slowly
poured in the cylinder and the surface is scraped flat. The handle ispulled toward the operator to lift the ramming rod. The cylinder
containing the sand together with the receptacle is set on the base on
which the ramming rod head is slowly placed until it is supported by
the sand surface. Then the crank is rotated three times toward theoperator to give three ramming actions.
The sand specimen thus rammed can be used as a test piece of thestandard dimension of 50 mm, if the indicator on the ramming rod
indicates a value within the allowance of ±1 mm. If the indication is
outside the limiting lines of the allowance, the test piece can not beused for testing, and the same process must be repeated by adjustingthe amount of the initial sand volume until a test piece of a proper
dimension is obtained. Once a proper dimension is confirmed, theramming rod is lifted up and the cylinder is taken out. The sand test
piece is pushed out using the push rod.
NOTE: This apparatus can also be used for preparing test pieces of
the height of 75 mm as specified by JSPS, the Japan Society for The
Promotion of Science.

A sand cylinder is inserted in a receptacle andsand of 140 to 175 g for testing is poured in itand rammed in the same manner as that forstrength test. The height of the test piece must be
50 mm±1 mm. If for green sand testing, the sandis not pushed out, but put in the permeability
tester as contained in the cylinder.
NOTE:
Ramming weight
6.5 kg (±10 g)
Drop distance
50 mm
Accompanying weightapprx. 2 kg
Ramming action
3 timesStandard dimension* Permeability test 50 mm in diameter
50 mm in height (±1 mm)* Strength test
50 mm in diameter
50 mm in height (±1 mm)
The apparatus is recommended to be placed on aconcrete basement, considering the effects of strong
impacts. The desirable height of the basement may be
about 500 to 600 mm.
* The "block" attached on top of the apparatus is for rapid
indication of sand moisture. The indicator has six
screws of different lengths. The screws can be switchedfor different moisture % by pulling a hexagonal rod forrotation. The lengths of the screws are adjusted beforehand by testing with sand whose moisture has beenmeasured by a standard moisture tester.

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/

May, 2012 1st edition
Mar, 2024 3rd edition■ Official Site
https://www.nakayama-meps.co.jp/■ Eastern Japan business officeTel: +81-24-545-6588 Fax: +81-24-544-6588