PCB Tech - How should the cost of the PCB board be calculated?

The cost calculation method of circuit boards is generally calculated through comprehensive factors such as different processes and different material processing, and the quotation is generally calculated in units of per square meter. Of course, some special customized materials and process requirements will increase or decrease the price accordingly, and these are all subject to cost accounting.

Cost = material + labor + manufacturing cost

What are the materials included?

The PCB process is longer, and there is a lot of room to control the production cost. Production costs include: raw material control, water and electricity control, scrap rate control, process control, etc.

1. Raw material control

For the same board, whoever can use the least materials to complete it will have the lowest production cost. To control the least materials is to control its rework rate and employee waste rate, although many factories have PMC departments to limit Produced materials, but this is a solution to the symptoms and not the root cause. The materials are not enough and the production cannot be stopped. In the end, it has to be sent to him.

To really cure the root cause, it is necessary to start with the proficiency of the employees, the management ability of the supervisor, and the design of the process. . A strict management system and reasonable operation methods will reduce a lot of human errors. It is recommended that some key positions should be completed by experienced employees. For example: process designer, production supervisor, MI authoring engineer, etc.!

2, water and electricity control

Reasonable utilization of water and electricity is very important, especially in peak seasons. There is often insufficient power. Many places have adopted power curtailment control. When the machine is not in use, it must be stopped., Reasonable use of electricity can reduce large costs.

Advocate that production planners must be proficient in technological processes, closely cooperate with production and marketing departments, and communicate frequently to obtain timely information in order to arrange production plans reasonably!

3, scrap rate control

Scrap board is indeed a pity, especially the soaring copper plate on the market, rising materials, and declining PCB profits. If the scrap rate is too high, it will undoubtedly worsen the business economy. How to control the scrap rate! This requires us to find a better operating system and management system to tolerate employee negligence and material instability. In controlling the scrap rate, we can control from the following points:

(1) Enhance employees’ awareness and make them understand that circuit boards are a valuable thing, and they must be handled with care at all times. Don’t let him feel that we produce cheap boards or junk boards. Naturally, he should also It won’t be treated as a baby. Just like the posture that we require to hold the board, we must hold the board with two hands. We don’t talk about the quality benefits of this. Just this posture can make people feel the preciousness of the board. Sex!

(2) QA MRB (Retirement Reviewer) is very important. It is up to him to judge whether the board should be scrapped. Then he must have a high sense of responsibility and be familiar with each process. If the board can be saved, give him a judgement. If it is scrapped, it is undoubtedly a waste. If the board that cannot be saved is judged as qualified by him and the process continues, the raw materials of the subsequent process will be wasted.

(3) Continuously introduce new technologies and seek the most reasonable working mode to tolerate employee mistakes.

(4) Let every employee know the monthly PCB scrap rate, and let them feel the benefits brought to them by reducing the scrap rate! Often summarize the reasons for scrapping and know how our boards are scrapped.

A good PCB board is based on the selection of materials and needs to go through each process carefully and carefully. There is no room for sloppy. The cost of materials and the precision of the process also determine the final quotation of the circuit board.