6.5 Component Trim and Form

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Outline

This procedure covers the general guidelines for trimming and forming electronic component leads. Components may be supplied in a frame configuration and need to be trimmed and formed to meet requirements to match component footprint patterns on circuit boards.

Minimum Skill Level - Expert
Recommended for technicians with advanced soldering and component rework skills and extensive experience in most repair/rework procedures.

Conformance Level - High
This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.

Acceptability References
IPC-A-610	Acceptability of Electronic Assemblies


Procedure References
1.0	Foreword
2.1	Handling Electronic Assemblies
2.2	Cleaning

Procedure

Caution: This process may use automated, semi-automated, and manual trimming and forming machines. Operators should use appropriate safety procedures and safety equipment to prevent injury.

Caution: Trimming and forming equipment may use compressed air. Trimming and forming machines often use safety locks that require two-handed operation to activate. If the operator should remove their hands from these buttons during operation, the cylinder ram will retract and automatically return to the home position. During the production cycle, the operator should visually verify the stroke cycle's completion, ensuring the cylinder ram comes to a complete stop.

Procedure

Obtain the component to be formed and determine the finished component lead formed dimensions. (see Figure 1.) These dimensions are usually shown on the circuit board assembly drawing.
Verify all dimensions using appropriate documents, measuring tools, and equipment.
If the component being processed has a plastic tie bar or frame, it may be necessary to trim this tie bar before processing. (See Figure 2.)
Place the component in the cutting/forming area using a vacuum pen. Ensure the position is appropriate.
Simultaneously press the two activation switches on the trim and form machine. Allow the machine to complete its cycle and return to the up position before releasing the switches. (See Figure 3.)
Repeat the process. The component may require rotation to process component leads on adjacent or opposing sides.
Remove the part and place it in ESD-safe packaging for further processing or transport.

Evaluation

Visual examination.
Tests or other inspection criteria as specified by customer drawings.

Images and Figures

Component Trim and Form

Figure 1. Determine the finished component lead formed dimensions.

Figure 2. If the component being processed has a plastic tie bar or frame, it may be necessary to trim this tie bar before processing.

Figure 3. Trim and form machine performing the cutting and forming operations.

Figure 4. See the procedure for detailed instructions.

6.5 Component Trim and Form

Trim and form component leads to meet mechanical and electrical requirements. Covers lead shaping, length control and stress reduction techniques to ensure proper fit and long-term reliability. Minimum Skill Level: Expert Conformance Level: High

Trim and form component leads to meet mechanical and electrical requirements. Covers lead shaping, length control and stress reduction techniques to ensure proper fit and long-term reliability.

Minimum Skill Level: Expert
Conformance Level: High