IPC includes test methods for determining various SMT placement equipment attributes, including repeatability, accuracy and attribute de- fects. Each of. 3 Placement Performance Metric. Placement Performance Form IPCF1 . General Performance. Performance Validation. Find the most up-to-date version of IPC at Engineering
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Placement equipment evaluations always have been confusing and complicated. Although some commonality does exist, most 9580 historically have developed their own methods for establishing placement performance in terms of placement rate, accuracy, repeatability, etc.
Lack of a common, industry-wide benchmarking methodology makes placement machine analysis difficult and time-consuming for ipx and users. Several years ago, the IPC — Association Connecting Electronics Industries sponsored an effort to develop a placement equipment evaluation model that would be accepted and used by placement machine suppliers and customers alike.
Placement Equipment Characterization Using IPC-9850
IPC creates a common method for establishing the performance capability of machines used to place surface mount components. This document was developed to standardize the parameters, measurement procedures and methodologies used for the specification, evaluation and continuing verification of placement equipment parameters. IPC combines placement rate and placement quality so speed and accuracy parameters depend on each other.
Also, because of the convergence of high-accuracy i. To measure placement machine capability accuracy, it is necessary to eliminate process variables introduced by other surface mount processes.
Placement Equipment Characterization Using IPC
It also is necessary to minimize material variation due to component quality, component packaging format and substrate quality. This is kpc by placing standardized components on clear glass panels that have been coated with a sticky media. Although this method is not an ideal simulation of an actual production environment, it was selected to eliminate as much assembly variation as possible so that it could be performed at various locations.
Five component types were selected to represent the full range of components placed by this type jpc equipment: Capacitors were selected over resistors because the outside edges are more precise and geometrically accurate.
The SOIC component was selected because it is robust and accurately represents a broad family of coarse-pitch components. Both components are economical and available in tape-and-reel, which are key attributes. To ensure the desired level of accuracy and repeatability, glass slugs are used to represent the more complex devices. A clear glass substrate coated with a sticky media is used for component mounting. This approach has two distinct advantages.
Second, because the glass panel is transparent, an optical coordinate measuring machine CMM can illuminate the component outline, making accurate measurement possible. A single glass panel, referred to as the placement verification panel PVPhas been developed and standardized. These glass panels also must be certified using an internationally recognized standards institute. Each PVP contains the following component types and quantities.
Each combination component and quantity is referred to as a component group: Optical CMMs are delicate instruments that require accurate calibration. They also are environment sensitive, so they must be used in a controlled environment. The accuracy and repeatability of the optical CMM must be considerably better than the accuracy and repeatability of the placement machine being evaluated.
Accuracy must be determined using a NIST-certified gauge, which in this case is a clear glass verification panel with selected component outlines etched into the glass. Several standardized forms have been created to record measurement results. The Placement Performance Metric form, which is completed by suppliers, reports general machine performance by model type and confirms the performance of a specific machine by serial number.
The Reliability Performance form, which is completed by users, documents the reliability of factory-installed machines used in production. This long overdue document will benefit everyone. It will reduce the effort required to evaluate and analyze surface mount placement machines, and it also 950 reduce disagreement between users and suppliers regarding equipment performance and functionality. This document can be purchased directly from the IPC www.
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