When we do PCB design, we attach great importance to the direction and corresponding order of the bit number. We are worried that the direction of the bit number is reversed or the silk print is not accurate, which will affect the patch error.
So what impact does the sequence of the sequence of the silk seal number or the sequence of the wire printing number be reversed?
First of all, it can be clear that the silk seal number cannot determine whether the final patch is correct. Many experienced engineers have found that many experienced engineers have found that they have deleted the bit number of the bit number, and there is no problem with the return of PCBA service products. Generally speaking, the machine patch is found first, and then placed the device found on the PCB correct position. This involves simple programming, including two points:
1. The pickup program is to tell the machine where to pick up the part, what component, and what packaging component to pick up information. The content includes: the name of each step, the offset of each step of X, Y, and angle T, the type of feeder, picking height, throwing position, or skipping.
2. Patch program is to tell the machine where to post components, the angle of the patch, the height of the patch. Its content includes: the component name and description of each step, the x, y coordinates and angle T of each step, whether the patch height needs to be corrected, the number of patch heads, whether the patch time, whether the steps are skipped, etc. The patch also includes the X and Y coordinate information and local marks of PCB manufacturing.
This shows that the machine patch will not find the silk seal number on your PCB, but work according to the programming program.
The most important file of programming is accurate coordinate files, so we can understand why you do not need a bit number diagram, but the coordinate file must be required.
Factors of increasing the value of automotive PCBIn recent years, the trend of automobile electrification and electronics has become more and more obvious.
As the backbone of electronic products, the importance of PCB manufacturing in the automotive supply chain is also increasing day by day.
Compared with traditional fuel vehicles, the addition of charging, energy storage, power distribution and voltage conversion equipment for new energy vehicles will bring a large number of new application scenarios to PCBs.At the same time, although autonomous driving above L4 cannot be mass-produced in a short time, the gradual penetration of a variety of intelligent driving components will bring rapid development opportunities for the application of high-end high-frequency PCBs in automobiles.According to calculations by relevant departments, only in the powertrain and transmission fields, the value of PCBs on electric vehicles is as high as about RMB 800 per bicycle, which is 20 times the value of PCBs in this field of traditional vehicles.The new demand for electric vehicles mainly comes from powertrain related equipment-on-board chargers, battery management systems (BMS), voltage conversion systems (DC-DC, inverters, etc.)
and other high-voltage and low-voltage devices.Factors of increasing automotive PCB productionA large number of high-voltage and high-power devices contained in new energy vehicles, such as IGBTs and MOSFETs, have high requirements for heat dissipation, which makes the layout of PCBs not too dense, which further increases the amount of PCBs for new energy vehicles.On each new energy vehicle, the total PCB board required for the above-mentioned equipment alone amounts to about 0.8 square meters.However, the total PCB required for a medium-level electronic fuel vehicle is only about 0.43 square meters.
In the internal combustion engine and traditional system of traditional fuel vehicles, the amount of PCB used is very small, only about 0.04 square meters in total, which has greatly increased the output of automotive PCB.According to calculations by relevant departments, the PCB consumption of new energy vehicles equipped with millimeter-wave radar and large central control screens will reach 1.24 square meters, worth 1281 yuan, which is 3.6 times that of traditional fuel vehicles without the above configuration.Factors contributing to the considerable growth rate of China's pcb marketThe production and sales of China's new energy passenger vehicles will continue to grow rapidly in the next few years, and the CAGR is expected to be around 40% in 2018-2025.
The domestic new energy passenger vehicle sales exceeded 1 million in 2018, and it is expected to exceed 2.5 million by 2020, and close to 12 million by 2025, with a market share of more than 40%.Major domestic PCB manufacturers have a relatively complete layout in the fields of automotive infotainment, lighting, powertrain and chassis (steering and braking).It is estimated that by 2025, the global automotive PCB market will reach 58.3 billion yuan, and China is expected to reach 40 billion yuan.
