吸入室安装在异径 管的喇叭口端，吸入室的另一端为吸入口。
The sucking room is provided on the bellmouthing end of the reducing pipe, another end of the sucking room is a suction inlet.
入口形状为圆弧的整形模其入口曲率半径R的选择和入口形状为锥度的整形模其入口角度的选择，以及精整中消除喇叭口的措施。
The determination of entrance angle of both R coining dies and conical coining dies and the approach to eliminating bell shapes during sizing have been outlined.
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