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日本生产的 PR-25型冲击式电动凿岩机是用于对水磨石地面打眼安放地脚螺钉固定机床的专用工具(1979年从日本引进)。所用锒焊硬质合金片的小钎头如图1。尺寸为φ14×135mm。为了便于分析和说明,特标以字母和尺寸。据使用者讲,该小钎头的寿命在200米以上,而我们仿制的同类小钎头寿命仅在30～40米以下。为了找出日本小钎头寿命高的原因,结合仿制的和其它国内钎头的大量损坏都是以钎体早期损坏而使寿命不高的原因,我们对日本硬质合金小钎头的材质和制造工艺进行了分析和做了一些对比试验,以期达到提高我们生产的钎头寿命的目的。
The PR-25 Impact Electric Rock Drill manufactured in Japan is a special tool (from Japan introduced in 1979) for drilling holes on terrazzo ground and mounting anchor screws. Used solder alloy sheet of small solder head Figure 1. Size is φ14 × 135mm. For ease of analysis and clarification, special characters are given in letters and sizes. According to the user, the life of the small solder head is more than 200 meters, and the life of the similar small solder head we imitate is only below 30 to 40 meters. In order to find out the reasons for the high life of small drill bit in Japan, the combination of imitation and other domestic drill bit large amount of damage are caused by the early damage of the solder body to make the life is not high, we Japanese hard alloy bit material and The manufacturing process was analyzed and some comparative tests were done in order to achieve the goal of increasing the life of the drill bits we produce.