尾轴镗孔工艺

1.镗孔前的要求及准备工作
Requirement and preparation before boring.
1）孔的中心线己确定并提交船东船检认可，同时尾部的所有振动工作应停止。

Center line confirmed and approved by owner and inspector, and stop
all vibration at after.
2）检查在尾轴孔端面的加工圆及检验圆是否己标记。

Check marked for machining circle and check circle at stern tube.
3)检查尾管铸件是否符合图纸尺寸要求，确认后方可塞镗排进行镗孔。

Check the size of stern tube casting, ensure the size as same as the size
of shaft arrangement drawing, after being confirmed, take the boring
spindle into stern tube
4)对镗排应进行严格的检查休整，确保镗孔所需各种工具到位。

2.镗排在船上的安装
Installation boring spindle on board.
1）将专用镗排用滑车及手拉葫芦慢慢装入尾轴孔内并在适当的位置用专用轴承支承。

（见图①）
Fix special boring spindle slowly into stern tube by tackle and hand
gourd and support by special bearing where necessary (See fig. ①).
2）在镗排的两端近尾轴孔的两端面固定两根划针，（见图①所示）慢慢转动镗杆根据尾轴孔两端的检验圆进行校核镗杆，直至镗杆与尾管两端的检验圆同心，将
镗孔上各调整轴承固定并将传动装置安装到位，这样可以开始进行尾轴孔的切
削。

Fix two needle at boring spindle both ends near stern tube both ends
(showed in fig. ①), slowly rotate boring spindle according to stern tube
both ends check circle until boring spindle is concentric with check
circle at stern tube both ends, fix adjustment bearing on boring hole
and install power unit, so can begin stern tube hole cutting.
3.尾管的镗孔
Boring for stern tube
1）根据图纸要求见尾轴尾管总图加工达到图纸的要求，见图②，镗孔须分粗镗、半精镗、精镗三阶级，每阶段加工后须要据检验圆校核镗杆位置有无移动，经
检验无误或经调整后方可进行下阶段，具体各阶段的加工切削用量如下表。

According to drawing requirement seeing stern tube general drawing，
see fig. ②, boring must be divided into three stages of heavy boring 、
half finally boring and finally boring, must check whether boring
spindle position is moved as check circle after rough machining, finally
boring can be carry out after having checked right or adjusted, actual
machining cutting value as follows table.
为了避免因温度的变化而引起的尾管变形，尾管的精镗最后刀应在阴雨天或夜
间一次连续完成,最后一刀的走刀方向最好与轴承压入的方向一致。

To avoid stern tube’s deformation due to temperature alternate, last
feed of stern tube finally boring should finish continuously at a time in
cloudy rainy day or at night, last feed cutting direction accord with
that of bearing press-in best.
2）尾轴孔加工完毕经检验合格后，加工两面端面。

Finish stern tube hole and check carry out, then machining two ends
surface.
3）检验人员测量时应测量艉管现场的温度，然后把测量的数据记录在附表中，测量完毕后把数据提供给相关部门计算艉管轴承加工尺寸。

We should measure the temperature of the stern tube when starting
measurement, then record the measurement value at attached sheet
and afford the value to design department to decide the machining size
of stern tube.
4.镗孔质量的检验及要求
Check and requirement for boring quality
1）尾管孔表面的检验，可采用专用工具对加工表面检测，对于与轴承配合的表面的粗糙度控制在3.2um以内，对于非配合表面粗糙度控制在6.4u m以内。

Check stern tube hole surface, can adopt special tool to check finish
surface, roughness for surface fit with bearing should be within 3.2um,
and roughness for no fit surface should be within 6.4um.
2）镗削后的孔的同轴度的检验，在镗杆的两端安装两只百分表（见图③），慢慢转动镗杆确保同轴度误差不超过0.05mm.
check hole coaxiality after boring, mount two dial gauge at the both
ends of boring spindle (see fig ③), and slowly turn boring spindle to ensure no coaxiality not exceeding 0.05mm.
3）艉管内镗孔尺寸的检验，镗孔加工允许（相对于某一纵截面）椭圆度为0.02mm，圆柱度为0.01/200mm。

Check stern tube hole size, we allow the ellipse defection of stern tube boring is 0.02mm, column deflection 0.01/200mm.
4）镗孔结束后，根据镗孔尺寸确定艉管轴承加工的尺寸，在加工过程中金加工应全程监控，确保尺寸的准确性。

（为了保证艉轴轴承加工尺寸的准确度，建议从艉轴轴承到货就检查其原始尺寸，包括内外径。

After boring, according to the size of boring to decide the size of stern tube bearing. The worker of the machinery workshop should attend checking the size of stern tube bearing ensure the size veracity.。