一、鋼結構(工程結構)件制孔優先采用鉆孔，當證明某些材料質量、厚度和孔徑(aperture)，沖孔后不會引起脆性時允許采用沖孔。鉆孔是在鉆床等機械上進行，可以鉆任何厚度的鋼結構構件（零件）。鉆孔的優點是螺栓(組成:頭部和螺桿組成)孔孔壁損傷較小，質量較好。

1、 Drilling is preferred for steel structure (engineering structure) parts. When it is proved that the quality, thickness and aperture of some materials will not cause brittleness after punching, punching is allowed. Drilling is carried out on the drilling machine and other machinery, which can drill steel structural members (parts) of any thickness. The advantage of drilling is that the wall damage of bolt (composed of head and screw) hole is less and the quality is better.

二、鋼結構(工程結構)加工制造中，沖孔一般只用于沖制非圓孔及薄板(性質:寶石學術語)孔，沖孔的孔徑(aperture)一定大于板厚，厚度在5㎜以下的所有普通鋼結構件允許沖孔，次要結構厚度小于12㎜允許采用沖孔。在沖切孔上，不得隨后施焊（槽形），除非證明材料在沖切后，仍保留有相當韌性，則可焊接施工。一般情況下在需要所沖的孔上再擴孔時，則沖孔一定比指定的直徑小3㎜。

2、 In the processing and manufacturing of steel structure (engineering structure), punching is generally only used for punching non-circular holes and thin plate (property: Gem academic language). The aperture of punching must be greater than the plate thickness. Punching is allowed for all ordinary steel structures with thickness less than 5 mm, and punching is allowed for secondary structures with thickness less than 12 mm. On the punching hole, no subsequent welding (groove shape) is allowed unless it is proved that the material retains considerable toughness after punching. In general, when the hole needs to be punched is reamed again, the diameter of the punch must be 3 mm smaller than the specified diameter.

三、鋼結構(工程結構)加工要求精度（度）較高時、板疊層數較多、同類孔較多時，可采用鉆模制孔或預鉆較小孔徑(aperture)、在組裝時擴孔的方法，當板疊小于5層時，預鉆小孔的直徑小于公稱直徑3㎜，當板疊大于5層時，小于公稱直徑二級（6㎜）。

3、 When the steel structure (engineering structure) processing requires high precision (degree), more laminates and more holes of the same kind, the method of drilling mold holes or pre drilling smaller diameter (aperture) and reaming during assembly can be adopted. When the laminate stack is less than 5 layers, the diameter of pre drilled hole is less than 3 mm of the nominal diameter, and when the laminate stack is more than 5 layers, it is less than grade II of the nominal diameter (6 mm).

四、鉆孔時常用平鉆頭，鉆不透孔用尖鉆頭。當板疊較厚，直徑較大，或材料強度（strength)較高時，則應使用可以降低（reduce)切削力的群鉆鉆頭，便于排屑和減少鉆頭的磨損(零部件失效的一種基本類型)。

4、 Flat bit is often used in drilling, and pointed bit is used in drilling. When the stack is thick, the diameter is large, or the strength of the material is high, the group drill bits which can reduce the cutting force should be used to facilitate chip removal and reduce the wear of the drill bits (a basic type of component failure).

五、長孔可用兩端鉆孔中間氧(Oxygen)割的辦法加工，但孔的長度一定大于孔直徑的2倍。

5、 Long holes can be drilled at both ends and cut with oxygen in the middle, but the length of the hole must be more than twice the diameter of the hole.