| 摘要 |
A roll welding machine has the frame mounting head and tail stocks for axially supporting a castor roll having a crack therein. The heat source is mounted upon the frame below and along the length of the roll for maintaining said roll at a minimum temperature of 600 DEG F., approximately. An upright support of inverted U-shape is secured to the frame and includes upright standards. Vertically adjustable interconnected slide carriers are mounted upon the standards and connected to a power winch by cables and pulleys. A power reciprocated cross slide is mounted upon the slide carriers and mounts horizontal support beam on which is guidably mounted a travel carriage supporting a depending welding head assembly. A welding wire drive feed head feeds the welding wire from a drum journaled upon the carriage. The side and ends of the roll are enclosed to define a uniform heat zone chamber whereby while the roll is welded, it is maintained at the minimum preheat temperature. The method of weld reconditioning of caster rolls wherein the roll cracks are machine gouged and adjacent roll surfaces are machined and undercut for receiving weld build up and overlay and the roll successively preheated is to a uniform minimum temperature of 600 DEG F., approximately, the improvement comprising the steps of mounting the roll for support and rotation about its longitudinal axis within a roll welding machine, enclosing the roll upon its sides and ends to define a uniform heat zone chamber surrounding the roll, and positioning a heat source below and along the roll length within the chamber to maintain the roll at the minimum uniform temperature and simultaneously welding and filling roll gouges and applying weld build up and overlay.
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