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method for masking borrelement at thermo chemical surface treatment and borrelement for striking drilling
method for masking borrelement at thermo chemical surface treatment and borrelement for striking drilling
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机译:化学表面处理中的掩埋钻探方法和打孔钻探方法
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摘要
A metallic drilling member is surface hardened except at an end portion, because the end portion is masked. The masking is achieved by placing on the end portion a lid which forms a slight gap around the surface being heat treated. During the heat treatment a furnace atmosphere enters the gap to cause the depth of the heat treatment to be gradually decreased in a manner producing a relatively elongated transition zone between heat treated and non-heat treated portions of the surface. The gap can be of constant width, or gradually decreasing width.
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