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Dołączył: 15 Mar 2011
Posty: 34
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Skąd: England
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 Wysłany: Pią 5:56, 01 Kwi 2011 Temat postu: Nike Air Max 1 shoes Crane Boom Generat Air Max 20 |
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st, the boom generated wave deformation of the reasons web
1, Plate Itself as Transport And storage causes distortion generated in the processing of good welding had not completely eliminate the stress, welded into a web of internal stress after the superposition [link widoczny dla zalogowanych], resulting in wave distortion.
2, the next material process, due to the existence of local internal stress of web material, leading to wave distortion of local produce.
3, the welding box, because school can not be on the web for welding equipment size correction, and support tooling cabinets have size error, can not guarantee that the web after welding the correct geometry, so that the local web was uneven shape.
4, in use because of overload, high temperature of the Diagonal, the boom deflection under severe wave distortion produced web.
Second, to prevent the deformation response wave generated web
1, first plate in the flat plane correction Flattening, cutting later Shot Plate processor to eliminate the stress and to Oxidation Skin. Especially the makeup welding steel web with a small size, before and after the welding machine with a leveling plate and pretreatment; if not flat-panel machine, can be welded steel plate on the long platform with a wooden hammer hammer weld around to eliminate internal stress.
2 [link widoczny dla zalogowanych], with NC Cutting Machine Cutting, cutting both sides of the webs out, so to avoid unilateral cutting dimension error and difficult to eliminate such problems as the internal stress, can greatly reduce the production of wave transformation.
3, the welding cosmetics boom box should be established in its mark both ends of wire between the one way or another within a web base support tooling to ensure the web in a straight line on the same side.
4, during use, should be the absolute prohibition of hoist overload, special cable-stayed heavy, but not allowed to pull in the ground or hanging frozen objects. Crane operator should avoid fierce [link widoczny dla zalogowanych], the fierce stop. Should always test the crane or under the arch deflection value, and prevent the boom caused by web under the torsion deformation generated waves.
Wave deformation occurs when the web should be based on JB1036-84 " General Bridge Crane Technical conditions "on their to be corrected. Away from the cover H / 3 (H for the web height) within the region, when the web thickness is greater than or equal to 6MM, the wave should not exceed 0.7 times the web thickness, the rest of the region should not exceed 1.2 times the wave degrees the web thickness. Wave measurement method shown in Figure 1.
Current wave distortion correction and more use of web Flame straightening. Specific correction process, should the Department of Correction from the convex spiral heating method can be used (see Figure 2), spiral track diameter of 80-120mm, the temperature between 700-800 . Such as the coil too, when heating the outer ring, the inner ring has been cooled; such as coil is too small, spiral inseparable, shrink poor results.
Point temperature heating temperature can be measured by, or under the plate to judge the color of the steel plate ,700-800 was cherry red. When heated round to reach this temperature, refer to Figure 3 of the hammer with a wooden hammer in order continuous, rapid hammering, hammering at the symmetric center of a circle the outer ring and then focus on hammering until the protruding part of the formation close to stop. When the temperature hammer should be stopped down to 300-500 , otherwise crisp blue as steel plate into the state prone to crack. scars can be left to further cooling in the process of compensation contract to clear.
Parts of the sag correction, can be a center hole of the steel plate welded with the Department of pull in the concave, external force can be used on-site lifting equipment or other devices
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