What is planishing?

Smoothing the surface of a metal by a rapid series of overlapping, light hammerlike blows or by rolling in a planishing mill.

In detail,

Soft materials like aluminum, copper etc. are planished between two flat faces. For harder materials the faces are given serrations in order to reduce the area in contact. The serrations are usually made by inducing grooves with an included angle of 30 - 90 Degrees.

F is the distace between the two serrations,

f is the land distace between the two serrations.

Thin sheets as they are normally used for precise equipment, one plain face and one serrated face is used.

For sheets between 1-4 mm thick, both faces of the planishing die should be serrated. For sheets above

4mm the teeth will usually face a groove. Material f / F Mild Steel 10-20% Hard Aluminum 20-50% Soft Aluminum 50-100% Soft Brass 30-60% Hard Brass 10-30% Stainless 10-15%GENERAL RULE: Area of contact f = 6 - 15 mm square.

Example Calculate the number of cubes required for planishing a mild steel sheet 1mm x 100mm square use f = 8 mm SquareF/f = 20 / 100 (See Chart above) F= 100 X 8 20 = 40mm Sq. F= root of 40 = 6.325 Therefore No. Of Cubes = 100 / 6 = 16

Note: See Websters or Oxford Dictionary for meaning.

From Rash,

Reference from Mr. Brain Gomes.

First answer by Rashpp. Last edit by Rashpp. Contributor trust: 9 [recommend contributor]. Question popularity: 1 [recommend question]