1. Brief introduction
Cold header is a kind of punching machine which can punch the steel bar into a certain shape under normal temperature. With the continuous development of production technology, automatic cold header has been widely used in automobile and mechanical parts manufacturing. This equipment can finish professional production of double-stroke solid-die standard parts, such as screw cat and screw nut, automatically from feeding, cutting, pressing, punching and shaping but omit the costly annealing process. Horizontal stages and secondary drive as main drive. The main slider is driven by a pressure elbow structure, and the flywheel and drive shaft are connected with a pneumatic friction clutch.
Cold header using cold-draw copper, aluminum wire and iron wire is the special equipment for self-plugging aluminum rivet and semi-tubular iron rivet production. With stable shaping rate and diverse products, this machine finish.straightening, sorting, cutting, shaping and blanking automatically.
2. Advantages of variable frequency transformation
Without using frequency inverter, the size, length, material of standard parts that produced by cold header depend on the feeding speed which by changing flywheel size. For different production accessories or materials, the large flywheel must be removed and fitted with the appropriate one. To achieve the required accuracy, the flywheel may be disassembled for many times which is too waste of time, manpower and resources .
3. Structure and working principle of cold header
Cold header is a kind of punching machine that can punch the steel bar into a certain shape under normal temperature. With the continuous development of production technology, automatic cold header has been widely used in automobile and mechanical parts manufacturing. This equipment can finish professional production of double-stroke solid-die standard parts, such as screw cat and screw nut, automatically from feeding, cutting, pressing, punching and shaping but omit the costly annealing process. Horizontal stages and secondary drive as main drive . The main slider is driven by a pressure elbow structure, and the flywheel and drive shaft are connected with a pneumatic friction clutch.
4. Transformation principle and application example of cold header
4.1. Transformation principle
Working with frequency inverter, the cold header’s rotate speed can achieve requirement by adjusting inverter’s output frequency. What’s more, it is more convenient for adjusting, more accurate in control and much better in protection. The motor start without load first , and then the clutch close when the rotate speed achieve requirement . Because at the moment of closing , current is very big , the frequency inverter must have enough overload capacity and reliable hardware . Please enlarge capacity when selecting right model.
Cold header is kind of punching processing machine in machinery manufacturing. This equipment is used to make the raw material into required shape but without changing it (mainly refers to without softening or hardening process) .
On one end of the crank axle with a pair of bevel pinion mounted, and a cam is mounted on its driven bevel pinion roller shaft of driven roller of the cam was vertically mounted with a scissors slider. This transformation overcomes the shortage of the existing technology, and the reduced friction and impact from feeding and cutting parts make the equipment running more stable, and effectively reduce the noise and improve products quality.
4.2. Application example
4.2.1. PI500 brief introduction
Feature of PI500:
Precise motor parameter self learning
steady speed precision, wide speed range
Low speed with high torque , small torque ripple
Instantaneous power off don’t stop function
40 ℃ ambient temperature and independent air duct design
Anti-corrosion paint spraying process
CE/TUV certification
Built in self-adjusting PID function module
Easy -to-use PC software
I/O expansion function
Built-in brake unit
Support various kinds of communication
High protective membrane keypad
Removable fan, easy to install and maintain
Add Quick multifunction key and keyboard locking function selection
4.2.2. Site pictures
Application Site in Ningbo
Application Site in Shenzhen
4.2.3 Frequency inverter configuration
|
Cold header |
Rated power( kW） |
Frequency inverter |
|
JH21-125 |
11KW |
PI500 011G3 |
|
JH21-80 |
7.5 |
PI9130A 7R5G3 |
|
JH21-60 |
5.5 |
PI9130A 5R5G3 |
4.2.4. Parameter setting
|
Function code |
Parameter name |
Default value |
Setting value |
Description |
|
F0.00 |
Motor control mode |
2 |
0 |
Vector control W/O PG |
|
F0.03 |
Frequency source master setting |
1 |
2 |
Analog AI1 setting |
|
F0.11 |
Command source selection |
0 |
1 |
Terminal block control |
|
F3.07 |
Stop mode |
0 |
1 |
Free stop |
4.2.5. Working principle
The frequency inverter start at first and runs to 30-50Hz, when the frequency is stable the colder header starts to work. When user adjust mold , the frequency usually runs around 5Hz.
5. Conclusion
Variable frequency transformation of cold header satisfied the technological requirements, meanwhile, improved the efficiency of work. Without using frequency inverter, cold header start directly and the huge shear force at the starting moment can easily cause damage to this equipment. Working with frequency inverter, the failure rate goes down, and the maintenance cost also reduced. But above all, there is still a big space for energy saving. So, frequency conversion transformation can be vigorously promoted in cold header industry.
With superior performance and reliable quality, POWTRAN PI9000 and PI500 series frequency inverter are widely used in various fields.
