100% In-Process Control at High Throughput Rates
When completeness matters or material is added or subtracted, weighing offers a simple quality control method to test narrow tolerances in-process or end-of-line. Combined with high throughput, it can improve product consistency and increase productivity.
Quality control is important in any production line to optimize yield, avoid waste and ensure products meet customer expectations. Whether the weighing is done automatically, semi-automatically or manually, controlling quality by weight can improve process speed and reduce human errors.
Weight-based quality control
A trend toward weight-based quality control, or WBQC, is emerging that allows manufacturers to check all dimensions at once in a split second. It accurately checks differences to 0.0001 percent, and the product can be oriented in any position. The method is so accurate, in fact, that it could quickly detect if one grain of rice was missing from 1 kilogram of rice.
WBQC offers a simple, fast completeness control method for parts, kits and modules. It is suitable for manual and automated production, packaging and shipping. It detects tolerance violations that can be far more difficult to detect with other methods. Errors that can be detected include small assembly deviations, package incompleteness, cavities in castings, and coating damage.
Manual and automatic WBQC
There are various WBQC control methods. For quick quality control in manual processes, static over/under checkweighing scales such as METTLER TOLEDO's ICS5 are ideal. Over/under checkweighers work well for small batches in assembly and production processes.
Special features can increase working speed even during manual or semi-manual operations. METTLER TOLEDO’s intuitive colorWeight® display instantly indicates whether the product is in specification or not. An internal article database saves relevant article data, such as tare, target weight, and tolerances, for fast and easy recall. Weigh data is stored in the transaction record as well.
High-precision weigh modules
To check quality parameters with small tolerances or very small parts in-process at the production machine level, high-precision weigh modules combined with a handling device or stop/go conveyor can be a perfect solution. These modules detect tolerance violations of 1ppm in a split second.
Seamless integration into the process enables 100 percent inspection without sacrificing throughput. With weighing, lighting and positioning of the part doesn’t matter. Therefore, this method can be used to control complex shapes, hidden structures, and material inconsistency. Transparent or reflective materials that can disrupt camera-based quality checks can be checked by weight as well.
Dynamic checkweighers can be used to ensure product quality in-line and check for package completeness when operated at the end of the line in logistics applications. They are typically used to check large batches, and can be ideal for production environments that process more than 40 products per minute.
To learn more about how weighing can improve accuracy and quality control in your production processes,visit: Completeness-Control