温度对不同外形PDC切削齿性能的影响

为了探究不同温度下PDC切削齿性能，以适应不同的钎焊温度，并合理选用外形来提高效率，从影响金刚石复合片（PDC）质量的主要参数:耐磨性、磨削时间、平稳性、抗冲击韧性等出发，对不同厂家、不同外形的PDC在受热前后的性能进行试验，同时比较了平面片、微弧片和弧面片性能上的差异。结果表明:随着温度的升高，磨耗比呈现出降低的趋势；加热到750℃后，PDC磨耗比降低约30%~50%，磨削时间增加，进尺变慢；当温度达到800℃时，磨耗比小于10万，冲击功小于100 J；PDC切削齿对温度的敏感度不同，可根据不同温度下的性能对其分级，以满足不同的钎焊温度的焊接；对于不同外形的PDC，平面片磨削时间短，磨削效率高，而微弧片和弧面片磨耗比略低，磨削时间长，但冲击韧性大大提高。因此，在制造PDC钻头的过程中合理选择PDC形状，并将不同性能的PDC用于钻头的不同部位，能够有效提高PDC钻头的寿命。 

Effect of temperature on the performance of PDC cutters with different shape

In order to explore the performance of PDC cutters at different temperatures to adapt to different brazing temperatures,and to reasonably select the shape to improve efficiency.Based on the several main parameters affecting the quality of polycrystalline diamond compacts(PDC),such as wear resistance,grinding time,stationarity and impact toughness,the performance of PDC sheets from different manufacturers and different shapes was tested.The performance of PDC before or after heating and at different temperatures was obtained.At the same time,the performance of flat sheets,micro-arcs sheets and arcs sheets was compared.The results show that with the increases of temperature,the wear ratio shows a tendency to decrease.After 750℃,the abrasion ratio of PDC is reduced by about 30%-50%,the grinding time is increased and the footage is slowed down.When the temperature reaches 800℃,the abrasion ratio is less than 100000 and the impact toughness is below 100 J.The PDC cutters are sensitive to temperature;it can be graded according to the performance at different temperatures to meet the welding temperature.For different shapes of PDC,the flat sheets have a short grinding time and high grinding efficiency,while the micro-arc and the arc sheets have a lower abrasion ratio and longer grinding time,but the impact toughness is greatly increased.Therefore,to improve the quality of PDC bits effectively,the shape of PDC should be chosen reasonably and the use of PDC with different performance in different parts should be considered in the process of manufacturing PDC bit.