挂舵臂镗孔

1.镗孔前的准备工作
Requirement and preparation before boring.
1）以挂舵臂中心位置确定支架烧焊位置，见图（1）
The support position should be welded according to the center
position of the rudder born casting see fig.(1)
2）挂舵臂镗孔轴线的确定
Decide the centerline of the rudder born casting
a.在挂舵臂孔处设立两个光靶如图（4）。

Set two targets on the rudder horn casting as shown on fig.(4)
b.采用中锤法使重锤与船台上的Fr0肋位重合，调整光靶使
细线处于光靶的中心。

Use plumb coincide with the Fr0 location ton the berth, then
adjust the target and make the wire just pass through the center.
c.拆除重锤，安装上塞芯。

在挂舵臂上用圆规划出加工圆和
检验圆，并提交船东检验认可。

Remove the plumb then set the plug and make circles mark as
requirement for machine and inspection and approved by
owner and surveyor.
2.镗排在船上的安装
Installation boring spindle on board
1）将镗排盖板用葫芦拉到挂舵臂位置，盖板图见图（2）。

Take the cover of boring spindle to the rudder born casting position (cup and down) by handle crane see fig.(2) about the cover drawing.
2）将镗排用滑车及手拉葫芦慢慢装入挂舵臂孔内，并在合适的位置用轴承固定，并将镗排用葫芦保险，见图（3）。

Fix boring spindle slowly into the rudder born casting hole by dilly and handle crane and support by bearing where necessary and safety by handle crane see fug. (3).
3）在镗排两端近挂舵臂的两端面固定两跟划针，慢慢移动镗排，根据挂舵臂孔两端检验圆进行校核镗排，直到镗排与挂舵臂两端同心。

将镗排上各调整轴承固定，拆除保险，并将传动装备烧焊所产生的应力再次拧紧，所有固定轴承的调节螺丝装上走刀箱，这样就可以开始进行挂舵臂孔的切削。

Fix two needle at boring spindle both ends near rudder born casting hole both ends. Slowly move boring spindle and adjust the screws according to rudder born casting both ends check circle until boring spindle is concentric with check circle at horn casting both ends. Fix adjustment bearings on boring spindle, dismount the safety and install gear in boring spindle, then loosen all bolts in order to remove stress because of the gear by welding, at last screw all bolts and install handle box. So can begin rudder horn casting hole cutting.
3.挂舵臂的镗孔
Boring for rudder horn casting
1）根据图纸要求加工到规定尺寸，镗孔必须分粗镗和精镗两个阶段。

粗加工后必须根据检验圆校核镗排的位置有无偏移，经检
验无误后或经调整后方可进行精镗。

According to drawing requirement machining to size of rudder
horn casting. Boring must be divided into two stages of heavy
boring and finally boring after heavy boring. We must check
whether boring spindle is moved as check circle. Finally boring
can be carry out after having checked right or adjusted.
2）挂舵臂孔加工完毕经检验合格后，加工两端面。

Finally rudder horn casting hole have machining and checked
carry out than machining two ends surface.
3）拆除镗排，然后进行探伤实验，再涂上一层防护油。

Dismount the boring spindle then made UC test at last apply a
layer anti-rust oil.
4）以镗销以后的挂舵臂孔中心进行复线，确定舵机座的中心，然后根据此中心划线，确定固定垫块的位置。

According to the center of the holes of rudder horn casting have
been finished cutting to decide the center of the foundation of the
steering gear. Then according to the center to make lineation. So
that ensure the location of welding steel chocks.。