PCB News - PCB process How to evaluate an SMT foundry

PCB process How to evaluate an SMT foundry

We usually call "electronic foundries" EMS or CM. When it comes to evaluating an electronic foundry, whether it is evaluating an SMT or a complete machine foundry, I remember that there is a six-character TQRDCE formula. This six Zi Jue can help assessors to consider multiple aspects.

T: Technology depends on the technology of this factory and whether it meets the needs.
Q: Quality is about quality.
R: Responsiveness depends on whether the manufacturer's response to the customer's inquiry is real-time and correct.
D: Delivery is the delivery date of the product.
C: Is Cost reasonable?
E: Whether Environmental does its part to the environment.

Generally speaking, the evaluation of an foundry cannot be done by a single person. Usually, at least procurement personnel or business personnel, engineering personnel, and quality control personnel should be involved together, because each person has different functions and the aspects of the evaluation And the focus will be different. Basically, procurement personnel and business personnel focus on the price and delivery of products; while engineering personnel focus on technology, process capability and equipment; quality control personnel focus on product quality control; the remaining Responsiveness and Environmental are Everyone should pay attention to it.

The items that need to be checked when evaluating an SMT foundry are listed below for reference only. Generally speaking, these items are the basis for scoring. Most companies also have the right to assign different weights according to the needs of individual companies.

Technology: Is there any advanced manufacturing process, automation and other equipment? Are there any process innovation capabilities? Is it capable of introducing new processes on the market?

Process capability evaluation: BGA IC repair capability; 0201 parts welding and repair capability; RoHS implementation; SOP integrity; how to work with special-shaped parts; how to work with tube material packaging; how to work with tray packaging; how to avoid wrong materials and polarity Conversely; whether there is Guidance of circuit board design for customers' reference; whether review circuit board design and provide DFM (Design For; Manufacturing) ability; MSL (Moisture Sensitivity Level) parts control ability; solder paste temperature recovery, unpacking, and storage Time limit control ability; de-panel process

Equipment: solder paste printer accuracy; SMT pick & place machine accuracy; is there AOI (Automated Optical Inspection); ICT test equipment (Agilent 3070, GenRad, TR5000)

Quality: Are there any factory certifications? Such as ISO, TS... etc. Have you imported statistical production (SPC), such as Cpk control of part size, production control chart? Are there ongoing quality control improvement activities? QCC or TQM; ECO (Engineeing Change Order) engineering change management; is there any special procurement (Waive) control for any parts? Is it possible to notify customers in real time and keep in touch with them if any quality problems are found? Quality control evaluation; incoming inspection record and management; SMT yield rate; customer complaint response; document management; BOM maintenance; ESD anti-static implementation; whether the inspection instrument is calibrated
Qualified parts and supplier control (AML & AVL management).

AML: Approved Materials List

AVL: Approved Vendor List

Responsiviness: Can you quickly respond to customer questions within 24 hours? Is it possible to react to new orders from customers in real time? Can the production capacity be quickly expanded when the customer has an urgent order? When the customer's engineering changes, how quickly can I respond? How quickly and how to deal with customer complaints?

Delivery: On-time delivery; delivery time meets the company's needs; follow up the delivery of the goods and answer the destination

Cost: Continuous improvement in response to price reductions; is the quotation listed in detail?

Environmental: Do you recognize the impact of the factory on the environment and take countermeasures? Do you try your best to comply with environmental protection from the beginning of product design? Whether to improve the impact on the environment from daily work?

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