SPC to establish information systems process real
China Zhenhua Electronics Group Co., Ltd. Yunnan Branch deputy chief engineer Rui-Shan
To improve chip resistance quality of products, need to establish SPC information system, timely and quality improvement processes, reduce production cost. SPC information system established, mainly in the hardware configuration, installation software, networking and other means to achieve the ultimate aim of real-time monitoring process quality, timely processing quality, reduce production cost.
As surface mount technology, chip resistor production capacity be expanded again and again, the annual output has exceeded 100 billion. At present, the chip resistor market is extremely competitive, the major competition is the quality and price. For such a huge production, with SPC (statistical process control) monitoring process quality, reduce production costs is desirable, but difficult to adapt to the statistical artificial. In order to improve the level of product quality, need for SPC information system, quality improvement process in time, reduce production costs. SPC information system established, mainly in the hardware configuration, installation software, networking and other means to achieve real-time monitoring process quality, process quality problems in a timely manner, to reduce production costs.
Information systems have a major impact on the SPC
Chip resistor according to the characteristics of the production of screen printing, trimming, plating three key processes purchase of computer hardware information site set up for screen printing resistive layer thickness and resistance, laser trimming of resistance, nickel and tin plating thickness control points to monitor quality control, information systems through the cable, the formation of SPC Information System Terminal Server internal information network.
Online version is installed on each computer control software, software regression nested control charts, multivariate control charts, regression control charts and other advanced statistical techniques for data analysis.
Test run through hardware, software, network presentation, the software problems in a timely manner to communicate with experts, and timely correction software malfunction. SPC techniques as traditional applications in the electronics components industry, there is a big limitation, leading to predictions generated SPC errors not accurately reflect the actual state of the production line. Resistance in the screen printing, laser trimming, plating have been very obvious problem.
Screen resistor is the same processing equipment to process a number of different specifications of the chip resistor, using a mathematical model of conventional control chart control chart were drawn control chart approach would lead to the data points in time is not continuous, The process control plan is to establish the rule determine anomalies in the data time continuous preconditions. Therefore, the conventional control chart can not be a mathematical model.
In trimming, semi-finished products testing, nickel, tin plated control point, the problem also exists. And control points in the tin-plated There is another problem, in addition to coating thickness, but also involving Pb ratio, the direct use of conventional analysis of the mean range control chart properties with nested data, there may be a controlled process error ruled out of control, can not find the reason out of control.
Quality control analysis of data is the basis for data collection for statistical process control should also pay attention to the following questions.
1. Test instrument has sufficient resolution, can distinguish the difference between the data.
2. Through regular calibration of the instrument has good accuracy and ensure the correct results.
3. To ensure sufficient precision instruments to ensure the equipment is less than the standard deviation of the data standard deviation parameters 1 / 10.
4. On abnormality data removed, in accordance with the statistical tools to determine whether the abnormal, not intuition.
5. To ensure the correct statistical control chart can be controlled by the state judge concluded the process of quality control at the beginning, the first batch of data to accumulate 25 from the control chart analysis of the statistical production process control.
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Great ideas. My experience with IT functions has been that they very seldom realize that they have important measures to track.