Servo turret punch is a composite sheet processing machine that adapts to the development of the times, which occupies an important and irreplaceable position in the sheet metal industry.
At present, although the laser cutting machine has developed rapidly and occupied a certain market share, due to its own limitations, it does not replace the position of the servo turret punch. Servo turret punch still has many advantages in sheet metal processing.
Further reading:
- CNC turret punch press: the definitive guide
Servo Turret Drill Development
Punch has a long history of development.
Today, there are generally three types: mechanical punch, hydraulic punch and servo punch.
After long-term market verification, the mechanical punch crankshaft structure is the main strength.
The hydraulic press uses high-pressure hydraulic oil to act on the piston and promote the reciprocating movement of the piston to form a stamping action.
Drilling pressure is adjusted by hydraulic oil pressure.
The servo punch is based on the mechanical punch.
There are various mechanical transmission structures, such as crankshaft structure, connecting rod structure, etc., or it is not a simple structure, but a composite structure with multiple structures at the same time.
Puncture of the crankshaft structure.
The middle part of the crankshaft has a simple structure and is easy to process, which is an advantage, but the disadvantage is also obvious.
It has a rated power stroke and the designed boost pressure can be achieved within the rated power stroke range.
Outside the rated power stroke range, the crankshaft cannot exert force, therefore it cannot meet the service conditions, resulting in the inability to pierce the iron plate and the sticking phenomenon.
Once you hold it, it's hard to deal with.
Retention will cause irreversible damage to mechanical stability.
The application of the connecting rod mechanism in the punch has changed people's traditional understanding of the punch and innovated people's concept.
The design of the linkage mechanism is more flexible and the layout of accessories can be more reasonable.
The simplest aspect is that he can set the length of the power arm, so as to change the impact force and give full advantage to the lever.
“Give me a foothold and I can explore the land.”
For punches with different tonnage in the same series, adjusting the data in the design is also more convenient, which is unmatched by the crankshaft structure.
The hydraulic system is applied to the punch, which revolutionized the punch at the beginning of its emergence.
The pressure of the hydraulic punch is constant throughout the entire stroke range, and there will be no problem of crankshaft structure punch rated power stroke.
In this way, it can punch some thick plates, large holes and deep drawing thick plates, because the stamping of these thick plates requires a lot of punching pressure.
This advantage of hydraulic punch is incomparable to other types of punch.
Some people still remain in the inherent concept of hydraulic pressure in the initial stage and think that the hydraulic punch is slow, which is characteristic of large-scale hydraulic special machines.
Now the about 30t hydraulic punch adopts high-quality hydraulic valves such as servo proportional valve, equipped with high-quality controller, and the stamping frequency can reach more than 1000 times/minute, which can perfectly meet the needs of production of metal sheets. However, the biggest disadvantage of the hydraulic system is that oil pollution is unacceptable.
With the profound development of the processing industry, the sheet metal industry needs to carry out fine division of labor, such as the separation of thick plate and thin plate, iron plate and non-ferrous metal plate, flat hole and deep drawing hole, etc.
After separation, different machines and equipment are used to process, and the quality and efficiency are greatly improved.
In this situation, the servo tower punch appeared.
Advantages of servo turret drill
High speed, high precision and cleanliness are the biggest advantages of servo turret drill.
In the source of kinetic energy generation, the mechanical punch uses an ordinary motor to drive the large flywheel to rotate continuously, and drives the crankshaft to rotate through the clutch to form a reciprocating movement, so as to realize stamping.
The drilling pressure comes from the inertial force generated by the high-quality flywheel rotating at high speed.
The clutch mainly includes hydraulic clutch and pneumatic clutch.
In principle, the crankshaft servo punch eliminates the ordinary motor, flywheel and clutch of the mechanical punch and installs the high-torque servo motor in the machine body to directly drive the crankshaft to rotate, form reciprocating motion and realize stamping.
In fact, the servo motor does not rotate continuously in one direction, but intermittently reverses and oscillates at high speed in the left and right positions near bottom dead center.
There is no need to return to top dead center to waste time.
It starts drilling directly from a relatively low position, so as to perform high-frequency drilling. The drilling pressure is determined by the torque of the servo motor.
Sometimes, to reduce the cost and size of the installation, a small torque servo motor will be used.
At this time, to achieve the required punching pressure, another reducer needs to be configured to increase the torque, so that the punching speed is reduced.
As a sliding bearing, copper sleeve is widely used in punching machines.
Copper sleeve is basically used in each rotary joint.
The copper sleeve can play a good supporting role because it is face-to-face contact and the stress mode is face-to-face stress.
The advantages are large tension surface, large bearing capacity, not easy to be damaged under normal use and long service life.
Of course there are disadvantages, that is, there is a certain friction, which will lose a small part of the power.
To adapt to the development of high-speed punch, bearings are used instead of copper bushings in some rotary joints of the punch, which has the advantage of reducing friction and power loss.
However, the disadvantages are also obvious.
When the bearing is subjected to impact force, it is a point or linear force, that is, the steel ball or roller directly impacts the inner and outer rings of the bearing, which is easy to cause damage. Therefore, it is impossible to withstand large impact pressure.
But for high speed, there must be some trade-offs.
For servo turret punching machine, it is a punching machine specially designed for thin sheets.
Most of them are less than 30t and the use of bearings will not have an adverse impact on the punch press.
The servo press uses the power of the servo motor, has various functions such as speed changing and executing, and has the characteristics of good speed controllability.
It directly drives the stamping mechanism and uses adaptive torque control technology, computer control technology, digital technology and feedback control technology to control the operation of the servo motor.
It can accurately control the position of the stamping head relative to the angle of the motor and use the stamping mechanism to carry out a variety of stamping processes.
By compiling different programs, various stamping movement curves required by the process are realized, different part deformation speeds are obtained, the part quality is guaranteed, and the die life is improved.
It is an environmentally friendly and energy-saving printer, realizes digital control of the printer and makes the printer truly enter the digital era.
Compared with the traditional press, the characteristics of the servo press are as follows:
(1) It can effectively improve production efficiency, and its stroke length can be set to the minimum value required for sheet metal processing, so as to obtain the forming speed corresponding to the processing content.
(2) The product has high processing precision, which can always maintain bottom dead center accuracy, avoid rough edges, and avoid bad products.
(3) Low equipment noise and long mold life.
The machine equipment is equipped with noise reduction device, which makes stamping smooth and greatly reduces noise pollution;
At the same time, the stamping distance between the die and the plate is controlled to minimize the working stroke of the die, so as to extend the service life of the die and significantly reduce the usage cost.
(4) The movement of the punch is controllable.
Users can use this feature to compile the pressure head movement mode suitable for sheet metal processing requirements, effectively improve the processing accuracy and product quality stability of parts, improve the service life and productivity of die and realize silent suppression, and also expand the processing range, which is suitable for stamping, deep drawing, stamping, bending and other processes, as well as the characteristic curves of various materials.
For example, the stamping head can be stopped to maintain pressure, so as to carry out the rib and rolling table manufacturing process and significantly improve the forming quality of sheet metal parts.
