Instruction for Extruding Tap For Drawing Oil Bar - GO BACK to USER'S GUIDE


Due to the drawing oil bar 's joint is extruded,The work torque is stronger,to tap thread is difficult.We require when you tap the workpiece,you should do like this:

(1). The joint material: the material is 45 steel,35 CrMo.Function of material should be fit for GB7229,hardness is HRC16-23.

(2). Under tapping condition:

* Vertical produce(suggest you use drilling machine)
* Revolution speed is 60-100 r/m,the customer can adjust the speed according to your products' specification ,size etc.
* Choose special coolant (we can supply it ),make it cycle
* Tap holder floatly install.
* The hole size:

* In order to gain better cool off after tap drills,please use the set taps (three taps is a group ),one by one.

(3). Guide for trouble -shooting tap problems:

1,Poor tool life
* Horizontal production lead to poor cool off.
* Hardness of workpiece is not according to national standards
* The tap 's hardness is lower
* The surface treatment of tap is not good.

2,Tap and workpiece holds tightly:hole size is smaller, make it bigger.

3,Incorrect wokpiece minor pitch:oversize hole lead to "double eyelid",decrease hole size.

4,Go-gauge will not enter:Check if the tap is worn off.Use new tap.

5,No -gauge enter part way:(workpiece is taper or bell-mouth)
* Check fixture alignment(¡»0.05mm).
* Check lubricant is enough when tapping starts and ends,change cycle condition.

6,Tap teeth break: workpiece has hardness dot.