Automotive industry applications: programmes, PPAP and volume

What changes when a part becomes automotive

Automotive sourcing differs from industrial sourcing in one structural way. The buyer is not only buying a part, it is buying a programme. The part is nominated before the vehicle or the assembly is in production, then launched against a date that is already published to a customer. Price matters, but the supplier is also committing to capacity, tooling, change control and a document pack that will be audited for the life of the programme.

Indian suppliers serve both domestic vehicle makers and export programmes, and the two ask for different things. A domestic programme may run on a drawing, a schedule and a first article. An export programme usually adds a full PPAP submission, a control plan, measurement system analysis and a capacity study. Ask which one you are buying before you compare quotes, because the evidence burden is part of the cost.

The part families and their process routes

Most automotive content in India falls into a small number of process families. Each one has a different tooling logic and a different failure mode, so the programme plan should follow the process rather than the part name.

The gates a programme passes through

A programme is easier to manage when both sides use the same gates. The labels vary by customer, but the sequence is consistent across the industry.

1. 01

   Quote and technical review

   The drawing, volume, tooling assumption and quality requirement are reviewed before a price is offered.

2. 02

   Nomination and tooling kick-off

   The supplier is awarded the part and the tool design is frozen against a drawing revision.

3. 03

   Process planning

   The process flow, failure modes and control plan are written before the tool is cut.

4. 04

   Tool trial and first article

   Parts are measured on every drawing feature and the tool is corrected.

5. 05

   PPAP submission

   The evidence pack is submitted and approved, often with an interim status.

6. 06

   Start of production and change control

   Production begins, and any change to process, material or sub-supplier is notified.

Volume bands and the tooling decision

The tooling decision follows the annual volume and the part size. For illustration, a programme of a few thousand parts a year may be built on a bridge die or a soft tool, while a programme in the hundreds of thousands can justify a progressive die with a higher tooling spend and a lower piece price. Those bands are illustrative. The crossover depends on part size, material, cycle time and how much manual handling the part needs.

Volume also changes the process discipline. A high volume line runs to a fixed cycle and a control plan with tight reaction notes. A low volume line may run the same part in batches with more inspection and more manual handling. A supplier that is good at one is not automatically good at the other, so ask which line will make your part and how often that line changes over.

The evidence pack a buyer should expect

The PPAP pack is often treated as paperwork. It is better read as a description of how the supplier will control the process. If the control plan does not match the process flow, or the failure modes do not match the drawing, the pack is a template rather than a plan.

• Design record at the current drawing revision
• Process flow diagram that matches the shop floor
• Failure mode analysis linked to the control plan
• Control plan with a reaction plan for each critical feature
• Measurement system study for the gauges used on those features
• Dimensional results on every drawing feature
• Material and performance test results
• Initial process capability study for special characteristics
• Master sample and checking aids
• Customer specific requirements, listed and answered

What the electric transition changes

Electrification moves the part mix. A battery electric vehicle needs fewer exhaust, fuel and transmission parts and more busbars, terminals, battery housings, thermal parts and high voltage connectors. Those parts bring new calls: creepage and clearance at higher voltage, plating for contact resistance, and cleanliness for parts that sit near a cell.

The programme discipline does not change, but the special characteristics do. A busbar joint that carries current for a decade, or a housing that must not track across a contaminated surface, needs a control plan built around that risk. A supplier with a strong stamping record but no high voltage experience will need support on insulation coordination and test coverage.

What to send and what to verify

For a quote that can be compared, send the drawing revision, the annual volume and the release size, the material and finish, the tooling assumption and the quality requirement. Say whether the part is for a domestic or an export programme, because that decides the document pack.

Before nomination, verify the entity and plant, the quality certificate and its scope, the process list, the capacity by line and shift, and the tooling ownership terms. Ask for a recent PPAP from a comparable part, not a certificate alone. Then audit the site. A strong cluster and a good brochure do not replace a look at the line that will run your part.

• Drawing revision and any customer specific standard
• Annual volume, release size and schedule pattern
• Material grade, temper and finish specification
• Tooling ownership, maintenance and transfer terms
• Quality certificate scope and recent PPAP sample
• Capacity statement by line and shift
• Packing, labelling and traceability requirement