| 摘要 |
PURPOSE: A coupling method for joints of bars having different diameters is provided to simplify coupling works of bars. CONSTITUTION: The coupling method for joints of bars having different diameters comprises the steps of processing an end of a bar having a small diameter(10) to form a joint(11) of the appointed length, then form-rolling the joint(11), processing an end of a bar having a large diameter(20) to have the same diameter as the joint(11) of the bar having a small diameter(10) to form a joint(21) of the appointed length, form-rolling joints(11,21) of the bars(10,20) and joining a coupling(30) which has the same diameter as screw parts(12,22) of the bars(10,20).
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