Straightening Machine

Straightening Machine


a machine used in rolling mills to level the surface of sheet steel. Straightening machines are divided into roll-type machines, which are the most common type, and stretching machines.

Roll-type straightening machines are designed for straightening thin and thick sheets in either the cold or hot states; stretching machines are designed mainly for cold straightening of thin sheets (steel and nonferrous metals) of which stringent quality requirements are made. The straightening process is based on elastoplastic flexing of the sheet upon passing between powered rolls arranged in a roll stand in two staggered rows. The precision of straightening depends on the spacing of the rolls (the greater the spacing, the lower the precision) and on the dimensions and number of rolls (the greater the number of rolls, the higher the precision). There are usually seven to 23 straightening rolls. Most modern straightening machines have supporting rolls in addition to the straightening rolls. The rate of straightening is 0.1-6.0 m/sec, depending on the thickness of the sheet.

The process of straightening in machines of the stretching type is based on the generation in the sheet of stresses approaching the yield point by the application of a stretching force. A straightening machine of the stretching type consists of a stand, two clamping heads, mechanism for moving the working head, and a drive. Stretching machines with hydraulically driven working heads are being used widely.

A combined stretching/bending method for continuous straightening of metal sheets is also being used. The bending is performed on a straightening machine, and the stretching is accomplished in devices with large-diameter rolls mounted on both sides of the straightening machine.

References in periodicals archive ?
Tenders are invited for we require a computerised steel straightening machine which processes bar directly from coil in diametres of 6mm - 12mm in both mild and high tensile steel and straightens it to desired lengths which are programmable.
Request of offers from companies and agents for the import/ supply of a straightening machine for metal bars and sections.
The camera aided system registers the lie of the pattern, monitors design repeat automatically and continuously, measures the width of the material, and realigns the pattern with the help of a straightening machine.
The Rolling Line consists of a billets cutting saws, a Rotary Heart Furnace for billets with a diameter of 30 m, a cone-type cross roll piercer, five rolling passes with three rolls RMM, a walking beam reheating furnace, a sizing mill with up to 10 passes with three rolls, last stand positions with adjustable rolls, a cooling bed, a straightening machine and pipe cutting saws.
Bar De-coiling and Straightening Machine, Scrap Bar Straightening Machine, Portable Cutting Machine, Radius Bending Machine, Manual Stirrup Bending Machine, Spiral Bender.
My Dad had two or three of these with his Bear alignment and frame straightening machine," writes James M.
The conveyor delivers the rods to an infeed table that feeds a rod straightening machine 4 followed by an inspection.
A Corus spokesman said: "Following the closure of the Shelton site, the roll straightening machine was transferred to Scunthorpe.
Bronx Engineering of Lye has delivered a tube straightening machine as part of pounds 2.
Four tenders asking for request of offers from companies and agents for the import/ supply of (a) a straightening machine for metal bars and sections, (b) a casting and rolling machine for copper strips, (c) revamping of laboratories containing a 30 tons pulling machine and a machine to measure different type metals solidity/ hardness and (d) rehabilitation of a grinding machine for rolls.
The Lye-based company has also won a pounds 400,000 order for a tube straightening machine from the Canadian steel supplier Copperweld in Woodstock, Ontario.
3 200 m - track work with rail-bound stuffing and straightening machine (presumably 3 stuffing passes); Approx.