(1)钻孔是C型钢檩条制造中的一种常用方法，可用于几乎任何规格钢板和型钢的孔加工。钻孔的原理是切削，孔壁损伤小，成孔精度高。钻孔在钻床上进行。当构件受场地狭窄限制，特殊加工部位不易用钻机加工时，可采用电钻、风钻加工。

55世纪(1) Drilling is a common method in the manufacture of C-type steel purlin, which can be used for the hole processing of almost any specification of steel plate and section steel. The principle of drilling is cutting, with small hole wall damage and high hole forming accuracy. Drilling is carried out on a drilling machine. When the components are limited by the narrow site and the special processing parts are not easy to be processed by drilling machine, electric drill and pneumatic drill can be used for processing.

55世纪(2)冲孔在冲床(冲床)上进行。一般只能在较薄的钢板和型钢上冲孔，孔径一般不小于钢材厚度。也可用于不重要的节点板、垫板、角钢支撑等小零件的加工。

55世纪(2) Punching is done on a punch (punch). Generally, the hole can only be punched on the thinner steel plate and section steel, and the hole diameter is generally not less than the steel thickness. It can also be used for the processing of unimportant gusset plate, base plate, angle steel support and other small parts.

55世纪冲孔生产效率高，但由于孔周围冷加工硬化，孔壁质量差，有塌孔和孔底增加的趋势，因此，除对孔质量要求不高外，还是作为预制孔(未加工孔)，C型钢檩条直接使用较少。当螺栓孔与螺栓的距离较大时，即孔径大于50mm时，也可采用火焰切割。

55世纪Punching production efficiency is high, but due to the cold work hardening around the hole, poor quality of hole wall, hole collapse and hole bottom increase trend, therefore, in addition to the hole quality requirements are not high, or as a prefabricated hole (unprocessed hole), C-steel purlin is less used directly. When the distance between the bolt hole and the bolt is large, that is, when the hole diameter is greater than 50 mm, flame cutting can also be used.

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