| 摘要 |
<p>1479479 Shearing; making expanded metal, stretching LE METAL DEPLOYE 7 Aug 1974 [9 Aug 1973] 34879/74 Headings B3W, B3A and B3E Metal sheet to be slit preparatory to expanding it is fed continuously to at least one pair of rotary tools 34, 37, Fig. 1, each tool comprising a metal disc with slots 44, Fig. 4, in which cutting strips 46 are secured having cutting edges 52, 53, formed by parallel planar sidefaces (47), (48) Fig. 6 (not shown) connected by an outer face 50 curved about the axis of rotation of the tool, and disposed at an angle of at least 45 degrees to that axis. The slots are so spaced that a strip on one tool engages between two strips on the other tool with a cutting clearance. The strips are of e.g. tungsten carbide or steel and are secured in the slots by adhesive or magnetism. The rear cutting edge 53 may as shown be interrupted by a slot 54 which caused a break in the slot formed by each strip. Each strip includes a spacer shunt 1, additional spacers 35, Fig. 2, may be used. A series of pairs of tools such as 37 and 34, Fig. 1 are keyed to sleeves 36, 30 respectively on shafts 7 and 8. For bringing the tools into shearing relation the shaft 8 is mounted on bearings 10, 12 which are slidable vertically on blocks 14 by means of nuts 15, Fig. 1, rigid with the bearings and fixed against rotation relative to the frame 16 by rods 17. Pinions 20 driven by a common worm 21 rotate spindles 18 in threaded engagement with respective nuts 15 to move the bearings synchronously. The shaft 8 is driven by a variable speed motor via belt and pulley 25 and reduction gear 24 connected to the shaft by a double Oldham joint to allow for the vertical adjustment of the shaft. The shaft 7 and smoothing rollers 1 and 2 are also driven from the reduction gear 24. The shaft 7 can be disconnected from the drive for angular adjustment relative to the shaft 8. The slit sheet, which may have longitudinal ribs formed in it by conventional shaping means is drawn by tension applied to the ribs perpendicularly to the feed direction F to form an expanded metal sheet.</p> |
