| 摘要 |
A method of producing an annular nonuniform groove (106) in the bore wall (104) of a casing (100) and a casing produced thereby is disclosed. The method includes the steps of forming a first portion (164), forming a second portion (172), and forming a third portion of an annular nonuniform groove. The first portion is formed by a first milling tool (168). The first portion defines a starting point (108) as the radial furthest point on the radially outer surface of the first portion. The first portion also defines a first intermediate point (166) as the radially closest point on the radial outer surface of the first portion. The second portion (172) is formed by a second milling tool (174, 180). The second portion is defined along the annular radial outer side wall from the first intermediate point to a second intermediate point (178). The second intermediate point (178) is defined as the radial closest point on the annular radially outer side wall of the second portion. The third portion (196) is formed by a third milling tool (194). The third portion (196) extends along the annular radial outer side wall of the annular nonuniform groove from the second intermediate point (178) to an ending point (110).
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