With the development of bronzing technology and the progress of mechanical manufacturing technology, automatic bronzing machine is gradually replacing the manual semi-automatic bronzing machine. Compared with hand-tilting semi-automatic bronzing machine, automatic bronzing machine fully shows its high speed and high efficiency.
1, progress in bronzing machine mechanical speed is fundamental. Automatic stamping machine is generally developed on the basis of die-cutting machine, so, the largest manufacturers of the maximum stamping speed is generally limited by the maximum die-cutting speed. Model 920 stamping machine die cutting maximum speed of 5500 pieces per hour, in order to avoid the impact of machine vibration on the precision of stamping, stamping speed is generally controlled within 4500 pieces.
In order to achieve high precision bronzing, the vibration of the bronzing machine must be reduced as far as possible. Mechanical vibration will directly affect the stability of photoelectric detection device and directly introduce the error into the system.
2. Application of photoelectric detection device and photoelectric switch.
Photoelectric frame plays a very important role in the precision control of holographic bronzing. If the photoelectric frame is not stable enough, mechanical vibration will lead to extremely subtle shaking of the light spots emitted from the photoelectric, when the light spots from the edge of the cursor through the period, the detection position will have a subtle change, this change in position directly leads to the location of the gold foil under the hot stamping module positioning deviation. Photoelectric detection mechanism is not stable may lead to a dozen or even dozens of wire positioning errors. Therefore, the stability design of photoelectric frame mechanism is very important.
Bronzing time is about 45 degrees on the foil. Angle is very sensitive to the effect of photosensitive value. Around 45 degrees, even a small change in Angle can cause a big change in the value of light. Photoelectric adjustment is to maximize the difference between marked and unmarked photosensitive value, which can effectively increase the sensitivity of photosensitive, and is conducive to high-precision positioning.
The effect of the spacing on the surface of the gold foil is also very sensitive. It is not that the closer the photoelectric is to the surface of the gold foil, the stronger the photosensitive is. This interval is related to the characteristics of photoelectric transmission and reception. Different brands of photoelectric switches need to be determined through special adjustment and test.
BOBST's photoelectric rack and photoelectric switch is a very good example. First, it provides a very stable photoelectric rack mechanism. At the same time, its photoelectric detection mechanism is designed strictly, the Angle and interval of the gold foil surface are fixed, which not only facilitates the adjustment, simplifies the control, but also provides the guarantee for the BOBST's high precision control.
3. In order to achieve high-speed control, the reflection time and stability of signals must be strictly controlled.
Different manufacturers of photoelectric switch response time is very different, some subtle level, some millisecond level difference. If the photoelectric switch signal is transmitted to the motion controller through the intermediate relay, then the loss time will not be ignored.
For example, the design speed of high-speed bronzing machine is 6000 pieces per hour, each cycle is only 600 milliseconds, of which the mechanical compression process takes at least 2/5 cycles, leaving only 360 milliseconds. In these 360 milliseconds, the processes include: motor acceleration, gold foil positioning, photoelectric beacon, signal conversion, transmission and request interruption, motor deceleration positioning and easing of gold foil tension after positioning. Any millisecond waste of time can have serious consequences.
In order to reduce the motor start and stop occupied by the time, high-speed bronzing machine generally choose the power of the servo motor. This is why BOBST will choose far more than the actual load of large motor reasons.