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                                  2. 公司新闻  
                                    珩磨管进行定压
                                    作者:

                                     第一个阶段是脱落切削阶段,这种定压珩磨,开始时由于孔壁粗糙,油石与孔壁接触面积很小,接触压力大,孔壁的凸出部分很快被磨去。而油石表面因接触压力大,?#30001;锨行?#23545;油石粘结剂的磨耗,使磨粒与粘结剂的结合强度下降,因而有的磨粒在切削压力的作用下自行脱落,油石面即露出新磨粒,此即油石自锐。

                                    第二阶段是破碎切削阶段,随着珩磨的进行,孔表面越来越光 ,与油石接触面积越来越大,单位面积的接触压力下降,切削效率降低。同时切下的?#34892;?#23567;而细,这些?#34892;?#23545;粘结剂的磨耗也很小。因此,油石磨粒脱落很少,此时磨削不是靠新磨粒,而是由磨粒尖端切削。因而磨粒尖端负荷很大,磨粒易破裂、崩碎而形成新的切削?#23567;?/p>

                                    第三阶段为堵塞切削阶段,继续珩磨时油石和孔表面的接触面积越来越大,极细的?#34892;?#22534;积于油石与孔壁之间不?#30528;?#38500;,造成油石堵塞,变得很光滑。因此油石切削能力极低,相当于抛光。若继续珩磨,油石堵塞严重而产生粘结性堵塞时,油石完全失去切削能力并严重发热,孔的精度和表面粗糙度均会受?#25509;?#21709;。此时应尽快结束珩磨。

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