农机配件数量大,多采用小砂箱手工造型,过去使用夹钳式夹具,合箱装夹时需用手锤敲打,经常出现塌箱或落砂等现象。后经研究改用了夹具,转动横棍,在丝杠和丝母的作用下夹紧上下砂箱。这种夹具的缺点是:夹紧箱爪时会产生一个顺时针方向的力矩,结果造成铸件错箱。同时由于丝杠暴露在外边,极易被泥砂迷死或被飞溅的铁水灌住。最后改 A large number of agricultural machinery parts, the use of small sandbox manual modeling, the past use of clamp-type fixture, combined with the box when the need to use hand hammer hammering, often appear collapse or falling sand and so on. After the study switched to the fixture, turn the horizontal bar, the role of screw and nut clamp up and down the flask. The disadvantage of this type of fixture is that a clockwise torque is generated when the jaws are clamped, resulting in a wrong casting box. At the same time as the screw exposed to the outside, easily killed by mud or splashed molten iron irrigation. Last change