求翻译：在喷油嘴的加工中，国内的大部分生产厂还都在使用钻孔工艺加工喷孔。这种工艺加工的喷孔，粗糙度差，在压力室中有翻边毛刺，喷油嘴流量系数只有0.5～0.6。为了满足越来越严格的排放法规要求，柴油机要求喷油嘴流量系数在0.8以上，需要进一步提高其流量系数。目前，国际上普遍采用液体挤压研磨的工艺，例如德国BOSCH、日本电装公司等是什么意思？

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In the injector in the processing of the country, most of the production plants are also used in processing the drilled hole. This technological processing of injection holes, roughness, pressure in the room with Flip Side burrs, injector flow coefficient is only 0.5 to 0.6 . In order to meet increa

In machining of nozzle, most of the production plants also use domestic processing injection hole drilling technique. This process of machining injection hole, roughness, and flanging Burr in the pressure Chamber, nozzle flow coefficient of only 0.5~0.6. In order to meet increasingly stringent emiss