| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a reamer adding work for removing inner diameter strain of a front boss and a rear boss and a readjustment process for producing concentricity. SOLUTION: This boom manufacturing method comprises a pair of left and right boom bodies 8L and 8R arranged in a forward projecting shape on both left and right sides of a traveling car body, a boom connecting body 14 for laterally connecting a midway part of the pair of left and right boom bodies, and a pair of left and right bosses 21 and 22 arranged in an end part of the pair of left and right boom bodies; and manufactures a boom by arranging installation holes 23 and 24 in the lateral direction for inserting a pivot in the pair of left and right bosses, and arranging an installation hole in the lateral direction for inserting the pivot in the pair of left and right bosses. The boss having the installation hole in the lateral direction is formed in advance out of a casting, and the boom connecting body is welded to the pair of left and right boom bodies, and after connecting the pair of left and right boom bodies by the boom connecting body, the pair of left and right bosses are welded to an end part of the pair of left and right boom bodies while aligning so that the mutual installation holes coincide with the left and right. COPYRIGHT: (C)2006,JPO&NCIPI
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