초록 ▼

Method for manufacturing long bars, round, square or flat, employing multi-tandem type roller dies mechanism in which each roller gap is controlled by the roller gap adjusting mechanism, and apparatus preferably applicable that method. The apparatus is provided with a plurality sets of roller dies,

Method for manufacturing long bars, round, square or flat, employing multi-tandem type roller dies mechanism in which each roller gap is controlled by the roller gap adjusting mechanism, and apparatus preferably applicable that method. The apparatus is provided with a plurality sets of roller dies, controllers for outputting a respective target roller gap for each roller dies, roller adjusting mechanisms capable of shifting, in accordance with the commanding signals from servo devices based on the output target roller gap, each roller of each set of roller dies symmetrically about the axial line of the die hole formed by the roller dies, roller position sensors for measuring the respective roller gap in order to feed back the measured results to the servo devices, and a propelling mechanism for imparting a deformable blank propelling force. The apparatus may be additionally provided with a dimension measuring device for, on the outlet side of the last set of roller dies, measuring the sectional dimension of the processed bar for permitting rectification of the roller gap of the roller dies by feeding back the measured results. The apparatus may be further added a traveling amount measuring device for measuring the traveling amount in the longitudinal direction of the processed bar for being able to gradually vary the roller gap of the roller dies in response to the traveling amount measured, by which the apparatus can be utilized for the manufacturing of tapered bars.

대표청구항 ▼

A method for manufacturing taper bars desiredly tapered at least in two directions by drawing using a multi-tandem type roller dies means comprising at least two successively arranged sets of idler rollers in different phase angle, each of said roller sets comprising a plurality of mutually approach

A method for manufacturing taper bars desiredly tapered at least in two directions by drawing using a multi-tandem type roller dies means comprising at least two successively arranged sets of idler rollers in different phase angle, each of said roller sets comprising a plurality of mutually approachable and departable rollers which are provided with a respective circumferential groove having a constant sectional configuration and constant dimension throughout the whole length thereof, said method comprising the following steps: (a) pulling a deformable blank through the roller sets at a temperature not exceeding 800°C.; (b) measuring the travelling amount in the longitudinal direction of the taper bar; (c) generating by a controller, based on the measured travelling amount and a taper value pre-set, signals respectively representing a target distance of each of said rollers from a predetermined level line; (d) measuring the actual distance of each roller from the level line; (e) comparing the target distance and the actual distance and adjusting the position of each roller so that the actual distance is equal to the target distance and all passes formed by said at least two sets of idler rollers are gradually changed in size in an interrelated manner to each other commonly based on the measured travelling amount; (f) the measuring of the travelling amount, the generation of the output signals representing the targe distances, the measuring of the actual distances and the adjusting of the roller positions being performed while drawing is in progress; and (g) the adjusting of the rollers of the plural roller sets being performed so that the passing line of the blank is maintained constant.