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公开(公告)号：US4761191A
公开(公告)日：1988-08-02
申请号：US945837
申请日：1986-12-23
CPC分类号： B23P15/28 , B23P9/00 , C21D1/00 , C21D1/68 , E21B10/56 , Y10T29/49865 , Y10T29/49945
摘要： A method of forming precision openings in hardened steel workpieces is disclosed. The method generally includes drilling nominal size openings in the workpiece while it is in a soft condition. Thereafter, sizing plugs formed from a material having a strength greater than that of the steel body during a predetermined range of temperatures are press-fitted in the openings. With the plugs in position, the body is heat treated to harden it. Subsequently, the plugs are removed and the resulting openings are found to be of an extremely uniform size without the wide variations present when hardening is performed without the sizing plugs.
摘要翻译： 公开了一种在硬化钢工件中形成精密开口的方法。 该方法通常包括在处于软状态下在工件上钻出公称尺寸的开口。 此后，在预定的温度范围内将具有比钢体强度大的强度的材料形成的定径塞压配合在开口中。 将插头置于适当的位置，将身体进行热处理以使其硬化。 随后，除去塞子并且发现所得到的开口具有非常均匀的尺寸，而在没有尺寸塞的情况下执行硬化时，不存在宽的变化。
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公开(公告)号：US4867015A
公开(公告)日：1989-09-19
申请号：US197507
申请日：1988-04-25
摘要： A rock drilling bit comprises a steel body defining a cutting face with hard material inserts press-fitted into preformed openings in the cutting face. The inserts have ends extending outwardly of the cutting face which perform the actual drilling or cutting operation. The face surface of the body is case hardened except for narrow continuous bands about each insert opening. A method particularly suited for forming the case hardened cutting face is also disclosed.
摘要翻译： 岩石钻头包括限定切削面的钢体，硬质材料刀片压配合到切削面中的预成型开口中。 插入件具有从切割面向外延伸的端部，其执行实际的钻孔或切割操作。 除了围绕每个插入开口的窄连续带外，机体的表面被表面硬化。 还公开了一种特别适用于形成壳体硬化切割面的方法。
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公开(公告)号：US4756373A
公开(公告)日：1988-07-12
申请号：US946442
申请日：1986-12-23
摘要： A rock drilling bit comprises a steel body defining a cutting face with hard material inserts press-fitted into preformed openings in the cutting face. The inserts have ends extending outwardly of the cutting face which perform the actual drilling or cutting operation. The face surface of the body is case hardened except for narrow continuous bands about each insert opening. A method particularly suited for forming the case hardened cutting face is also disclosed.
摘要翻译： 岩石钻头包括限定切削面的钢体，硬质材料刀片压配合到切削面中的预成型开口中。 插入件具有从切割面向外延伸的端部，其执行实际的钻孔或切割操作。 除了围绕每个插入开口的窄连续带外，机体的表面被表面硬化。 还公开了一种特别适用于形成壳体硬化切割面的方法。
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