In view of the importance of placement speed, manufacturers are doing everything possible to increase the speed of the placement machine. The methods currently used to increase the speed of the placement machine are mainly as follows.
- Structure improvement of placement machine
Choose dual tracks to complete PCB placement on one track, and send the board on the other track, reducing PCB delivery time and placement
Standby time of loading head;
Multiple placement head combination skills, now there are double heads and 4 heads, 6 heads, 8 number one structure;
The arch structure adopts both ends to be driven together to avoid the effect of the cantilever beam and reduce the mechanical stability time;
Combined (or modular) multi-unit structure, focusing on mounting speed per unit area.
- Mounting head and nozzle skills
Lightning placement head;
Multi-nozzle structure—up to 30 nozzles on one placement head
High reliability, high adaptability nozzle, can mount components from 0201 and 01005 to 30mm×30 mm QFP yuan
Pieces
Quickly change the nozzle.
- Motion drive and linear motor skills
Using vague control skills, the movement process is divided into 3 stages of control, namely “slow-fast-slow”, showing “s” change, from
The movement becomes both “soft” and fast;
The x-axis operation adopts a double servo motor drive system with a fully synchronized control loop to speed up the movement speed
Select high positioning accuracy and high repeat accuracy, with high speed and high acceleration, fast and stable (up to 55ms),
Patented linear motor with low working current and high precision control.
(4) Quick detection skills
Laser and CCD application cooperation;
Dual cameras-chip components and large-scale IC are detected separately
Fast image acquisition and conversion circuit
Advanced image processing and calculation software.
(5) Feeder skills
The feeding method of the intelligent feeder shortens the replacement time of components and manual errors;
Non-stop refueling
Double belt feeder;
Large-capacity feeder, some placement machines can reach 256 8mm feeder capacity
Replaceable trolley;
For devices with a lot of materials, try to use braid packaging
Efficient bulk feeding.
(6) Optimize the placement program
Optimization criteria:
The number of nozzle changes is less;
Short journey of picking up and patching
Multi-head placement machines should also consider picking up more pieces together each time
(7) Operate the machine in accordance with the safety operating procedures and improve the maintenance level of the equipment
(8) Software skills
Various forms of PCB files are directly optimized to generate patch program files, reducing manual programming time
Use offline programming for multiple varieties and small batches;
Machine fault self-diagnosis system and mass production induction system
Intelligent operation system.
