It is suggested that the springs having bluish dark color grinding face after grinding should be tempered once more and inspect existing defects or not.

建议对磨削后磨削面呈蓝黑色的弹簧再一次回火处理并检查是否存在缺陷。

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SHOULDER: Defect found on rib or outer diameter; a raised edge on rib face caused by grinding wheel; raised surface at either end of outer diameter raceway.

挡肩：外径或挡肩上发现的缺陷；挡肩上由于磨床砂轮所造成的突起；在外径滚道两端的突起。

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Using a helical involute pinion surface to form the grinding worm surface, a helical face gear is formed via a two-parameter worm envelope.

针对面齿轮硬齿面磨削加工中存在的困难，提出用蜗杆砂轮磨削的双参数法来磨削面齿轮。

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Road and rail links west to Dakar, in Senegal, are ropy, so Mali's lorry drivers face a grinding round trip of 2, 000km (1, 200 miles) or more through Benin or Togo to get any goods on to the world market.

ECONOMIST: Mali

Road and rail links to Dakar, in Senegal, to the west, are too ropey, so Mali's truckers face a grinding round trip of 2, 000km (1, 200 miles) or more through Benin or Togo to get any goods to the world market.

ECONOMIST: Deserving cases, getting too little help | The