# US 4,391,117 A · Rolling mills and methods of rolling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,391,117 A - Document ID: US4391117A - Status: Granted - Kind: A - Application number: 06/300,325 - Filed: 1981-09-08 - Granted: 1983-07-05 - Earliest claimed: 1978-06-02 - Assignees: Friedrich Kocks GmbH & Company - Inventors: Werner Demny - Web page: https://patentgrep.com/patent/US4391117A ## CPC - B21B 1/18: in a continuous process - Y10T 29/49991: Combined with rolling - B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A rolling mill and method for rolling material having a rectangular, oval or like elongated cross-sectional configuration into rod or wire, has a line of passes of which the first pass is formed by two rollers and the remaining passes are each formed by three rollers, and wherein the first pass deforms the material, whose input cross section has a ratio of the lengths of its major and minor principal axes greater than about 1:2 to an output cross section which is exactly round or a regular polygon, such as square or hexagonal or which deviates from such a geometrical configuration only to an extent such that the ratio of the lengths of the major and minor principal axes of the output cross section does not exceed about 1:2. ## Claims ### Claim 1 A rolling mill for rolling of bars and wire from stock having a rectangular, oval or similar elongate cross-sectional shape, the ratio of the lengths of the principal axes of the cross section of said stock being larger than approximately 1:2, comprising a plurality of roll stands arranged closely one behind the other to define a line of sizing passes, said roll stands having (a) a first entry sizing pass stand formed by two rolls whose roll axis is substantially transverse to the principal axis of the stock being rolled and receiving the stock to be rolled, (b) the cross-sectional shape of the said first sizing pass being one of an exact circle, a regular polygon having an even number of sides and a like but somewhat elongated geometrical figure, (c) the ratio of the lengths of whose principal axes does not exceed approximately 1:2, and (d) at least one three roll stand immediately following said two roll stand receiving the rolled stock from said first stand, the first stand of said three roll stands adjacent the two roll stand having one roll axis extending parallel to the longer principal axis of the first sizing pass cross section, in the case wherein the latter is somewhat elongated, all roll stands following the first stand being three roll stands. ### Claim 2 (depends on 1) A rolling mill as claimed in claim 1, in which the major principal axis of the first pass entry cross-sectional area of the stock to be rolled upstream of the first sizing pass extends vertically, and the roller axes of the first sizing pass extend horizontally. ### Claim 3 (depends on 1, 2) A rolling mill as claimed in claim 1 or 2, in which one roller axis of three rollers of the second sizing pass is arranged vertically. ### Claim 4 (depends on 1, 2) A rolling mill as claimed in claim 1 or 2, in which the sizing pass opening has, in the region of the roller gap of the first sizing pass, widened portions whose boundary lines slope relative to the roller axes. ### Claim 5 (depends on 3) A rolling mill as claimed in claim 3 in which the sizing pass opening has, in the region of the roller gap of the first sizing pass, widened portions whose boundary lines slope relative to the roller axes. ### Claim 6 (depends on 1, 2) A rolling mill as claimed in claim 1 or 2, wherein the cross-sectional shape of the first sizing pass is a circle. ### Claim 7 (depends on 1, 2) A rolling mill as claimed in claim 1 or 2, wherein the cross-sectional shape of the first sizing pass is elliptical with the major axis transverse to the roller axes. ### Claim 8 (depends on 1, 2) A rolling mill as claimed in claim 1 or 2, wherein the cross-sectional shape of the first sizing pass is hexagonal. ### Claim 9 A method of rolling bars and wire from stock having a rectangular, oval or similar elongate cross-sectional shape, the ratio of the lengths of the principal axes of the cross section of said stock being larger than about 1:2, comprising the steps of: (a) passing said stock between two rolls forming a first roll pass opening having a cross-sectional shape in one of an exact circle, a regular polygon having an even number of sides and a like elongate geometric figure having principal cross-sectional axes whose ratio is less than 1:2, and whose roll axes are substantially transverse to the principal axis of the stock being rolled; and (b) thereafter passing the sized product successively through at least one additional roll pass formed by three rolls, said roll pass immediately following the two roll pass having one roll axis extending parallel to the longer principal axis of said first roll pass section in the case where said section is elongate, and all passes thereafter being three roll passes. ### Claim 10 (depends on 9) The method as claimed in claim 9 wherein one roller axis of said at least one additional roll pass extends parallel to the longer principal axis of the first pass cross section. ### Claim 11 (depends on 9, 10) The method as claimed in claims 9 or 10, wherein the first roll pass opening is a circle. ### Claim 12 (depends on 9, 10) The method as claimed in claims 9 or 10, wherein the first roll pass opening is elliptical. ### Claim 13 (depends on 9, 10) The method as claimed in claims 9 or 10, wherein the first roll pass opening is a hexagon.