Rolling unit including at least two adjacent rolling stands, each having a pair of rolling rolls mounted on respective motorized shafts. The rolls of one rolling stand are disposed orthogonal and close to those of the adjacent rolling stand. The shafts are eccentrically supported in respective support elements, which are selectively rotatable around their axis and are each provided with rotation means to cooperate mechanically with an adjustment member suitable to make the support elements selectively rotate to determine an adjustment of the gap between the rolls. The rotation means of one pair of the support elements are directly connected kinematically to each other. The adjustment member is disposed, with respect to the rolling stands, so that the center of its gear lies very close to the line joining the centers of the support elements, so that a substantial part is contained in the bulk defined by the rolling stand.

Rolling unit including at least two adjacent rolling stands, each having a pair of rolling rolls mounted on respective motorized shafts. The rolls of one rolling stand are disposed orthogonal and close to those of the adjacent rolling stand. The shafts are eccentrically supported in respective support elements, which are selectively rotatable around their axis and are each provided with rotation means to cooperate mechanically with an adjustment member suitable to make the support elements selectively rotate to determine an adjustment of the gap between the rolls. The rotation means of one pair of the support elements are directly connected kinematically to each other. The adjustment member is disposed, with respect to the rolling stands, so that the center of its gear lies very close to the line joining the centers of the support elements, so that a substantial part is contained in the bulk defined by the rolling stand.

A precious alloy for horological applications contains by mass, in parts per thousand of the total, 540 to 630 parts of gold, 150 to 220 parts of palladium, 100 to 265 parts of silver, more than 150 to 265 parts of copper, from 0.0 to 0.2 parts of iridium, 0.0 to 4.0 parts of zinc, and the remainder containing iron and/or nickel and/or cobalt. The proportion by mass of the total content of gold, palladium, silver, copper, iridium and zinc is greater than 999.900 parts, the proportion by mass of the remainder is less than 0.100 parts. The density of the alloy includes between 13.5 and 14.5 g/cm.sup.3. The proportion by mass of cobalt is less than 0.005 parts, that of iron is less than 0.005 parts, and that of nickel is less than 0.0005 parts. The total of copper and zinc includes between 150 and 270 parts.

A precious alloy for horological applications contains by mass, in parts per thousand of the total, 540 to 630 parts of gold, 150 to 220 parts of palladium, 100 to 265 parts of silver, more than 150 to 265 parts of copper, from 0.0 to 0.2 parts of iridium, 0.0 to 4.0 parts of zinc, and the remainder containing iron and/or nickel and/or cobalt. The proportion by mass of the total content of gold, palladium, silver, copper, iridium and zinc is greater than 999.900 parts, the proportion by mass of the remainder is less than 0.100 parts. The density of the alloy includes between 13.5 and 14.5 g/cm.sup.3. The proportion by mass of cobalt is less than 0.005 parts, that of iron is less than 0.005 parts, and that of nickel is less than 0.0005 parts. The total of copper and zinc includes between 150 and 270 parts.

An apparatus for rolling a metal product includes a first roller and a second roller, both defining at least two rolling channels, and a guide configured to selectively guide the metal product toward one or another of the at least two rolling channels.

An apparatus for rolling a metal product includes a first roller and a second roller, both defining at least two rolling channels, and a guide configured to selectively guide the metal product toward one or another of the at least two rolling channels.

This invention provides a method for producing a polishing bar made of valve steel 53Cr21Mn9Ni4N. The process flow is as below: electric furnace smelting.fwdarw.outside-the-furnace refining.fwdarw.continuous casting.fwdarw.heating.fwdarw.high-speed wire rolling.fwdarw.heat treatment (off-line/online).fwdarw.straightening.fwdarw.polishing.fwdarw.inspection.fwdarw.storage. The production method of the invention adopts a casting method of continuous casting to overcome the poor high-temperature plasticity and the great deformation resistance of 53Cr21Mn9Ni4N which leads to a difficulty in continuous casting. The continuous casting is directly carried out on casting billets for rolling, which greatly reduces the material loss and energy consumption of this step, and improves the yield of the billets. The high-speed wire precision rolling technology is directly used on the continuous casting billets to improve the production efficiency, and greatly improve the size precision control of rolled and finished wire rods.

This invention provides a method for producing a polishing bar made of valve steel 53Cr21Mn9Ni4N. The process flow is as below: electric furnace smelting.fwdarw.outside-the-furnace refining.fwdarw.continuous casting.fwdarw.heating.fwdarw.high-speed wire rolling.fwdarw.heat treatment (off-line/online).fwdarw.straightening.fwdarw.polishing.fwdarw.inspection.fwdarw.storage. The production method of the invention adopts a casting method of continuous casting to overcome the poor high-temperature plasticity and the great deformation resistance of 53Cr21Mn9Ni4N which leads to a difficulty in continuous casting. The continuous casting is directly carried out on casting billets for rolling, which greatly reduces the material loss and energy consumption of this step, and improves the yield of the billets. The high-speed wire precision rolling technology is directly used on the continuous casting billets to improve the production efficiency, and greatly improve the size precision control of rolled and finished wire rods.

A production method for an elongated semi-finished product. A continuously fed wire is rolled by a rotating roller. Along its circumference, the roller has a first segment with a roller profile that rolls a profile into first sections of the wire, and also has a second segment without a roller profile that is rotated contact-free relative to the wire. During the rolling of the profile, the speed of the roller is adjusted in such a way that the speed of the roller profile is the same as the speed of the wire. During the contact-free rotation, the speed of the roller is adjusted in such a way that a length of the wire corresponding to a prescribed length of the second section passes the roller contact-free. A semi-finished product having the first section and having the second section is cut off of the shaped wire.

A production method for an elongated semi-finished product. A continuously fed wire is rolled by a rotating roller. Along its circumference, the roller has a first segment with a roller profile that rolls a profile into first sections of the wire, and also has a second segment without a roller profile that is rotated contact-free relative to the wire. During the rolling of the profile, the speed of the roller is adjusted in such a way that the speed of the roller profile is the same as the speed of the wire. During the contact-free rotation, the speed of the roller is adjusted in such a way that a length of the wire corresponding to a prescribed length of the second section passes the roller contact-free. A semi-finished product having the first section and having the second section is cut off of the shaped wire.