DFM知识点培训教材课件.ppt

整 体 概 述THE FIRST PART OF THE OVERALL OVERVIEW, P L E A S E S U M M A R I Z E T H E C O N T E N T第一部分DFM 101Part 1DFM 101 Part1 | Dec 2008 Celestica ConfidentialObjective: Provide basic training on performing manual DFMIncluded: Relevant guidelines from the DFx guidelines document Identify which checklist items can be evaluated using Valor Examples of DFM violations Some hands-on DFM exercisesNot included: DFT and DFA DFM using Valor Impact assessment of violationsDFM 101 OutlineDFM 101 Part1 | Dec 2008 Celestica ConfidentialAfter the session, attendees should be able to:DFM 101 OutlinelManually identify DFM violations in a customers design, using the DFM checklist and the PCA DFx GuidelCreate a DFM report for the customer using the standard templateDFM 101 Part1 | Dec 2008 ConfidentialDFM Review ProcessDFM 101 Part1 | Dec 2008 Celestica Confidential No single “best” way to approach a DFM review, find your own preferred method through experience. One possible approach: start at a high level, and progressively “zoom in”Background information define context for the reviewHigh level design define basic manufacturing processDetailed design identify specific violations & general priorityImpact assessment quantify impact, in order of priorityInvestigate alternatives specific suggestions for changesDFM Review ProcessDFM 101 Part1 | Dec 2008 Celestica ConfidentialBackgroundDefine context for the review Service level & product “context”: What is expected by the customer? e.g. turnaround time for the review, level of detail, etc. What type of product is it? e.g. low volume/high mix, high volume/low margin, high reliability, consumer, etc. What are the customers “hot buttons”? e.g. cost, quality, schedule, product functionality/performance, reliability, etc. Data review: what design information is available to include in the reviews? History: what past information is available? e.g. production data, previous DFM reportsDFM Review ProcessDFM 101 Part1 | Dec 2008 ConfidentialHigh Level Design Define basic manufacturing process Typically use BOM, assembly drawing &/or outer layers (lands) Look for parts/issues that may influence the basic process flow:PTH partsComplex connectorsTopside vs. backside Define a preliminary assembly process flow, to ensure that correct guidelines are applied during later detailed reviewPTH parts: selective wave, full wave, paste in hole, press fit, selective solder (softbeam, Ersa), etc.Test / inspect strategy Define a preliminary panelization concept, to optimize Master Panel utilization & meet assembly panel requirementsDFM Review ProcessDFM 101 Part1 | Dec 2008 Celestica ConfidentialDetailed Design Identify specific violations & general priority Use previous DFM reports, BOM, design file &/or gerber files, assembly drawing, PCB fabrication drawing, mechanical assembly drawing Work through Checklist, referring to DFM Guidelines as required Transfer items found to DFM Report, identify as hot/warm/cool focus designers limited time on the most critical itemsprioritize any additional detailed work required, e.g. impact assessment & alternativeskeep customers priorities in mind: cost, quality, schedule, etc. Request clarification or additional information from designer &/or suppliers if requiredDFM Review ProcessDFM 101 Part1 | Dec 2008 ConfidentialImpact AssessmentQuantify impact, in order of priority Time consuming, not many tools available yet to assist with this Business office needs to support providing this feedback to the customer & incorporating it into product quoting/pricing Need an overall DFx business model in place: who pays for the service? who benefits from improvements implemented in the design? etc. Could provide for all items, or only on items that may not be fixedDFM Review ProcessDFM 101 Part1 | Dec 2008 Celestica ConfidentialInvestigate AlternativesSpecific suggestions for changes Very time consuming, should only be performed if appropriate & as time permits Start with highest impact issues, or ones most likely to have an alternative that we can suggestDFM Review ProcessDFM 101 Part1 | Dec 2008 Celestica ConfidentialDFM ChecklistDFM 101 Part1 | Dec 2008 Celestica Confidential Data & History Components Process Flow PTH Assembly SMT Assembly Layout & Spacing Land Patterns Silkscreen Board Outline PCB Fabrication Drawing Mechanical Assembly (not covered in this session)DFM Checklist TopicsDFM 101 Part1 | Dec 2008 Celestica ConfidentialDFM ChecklistThe DFM Checklist is used to ensure that a comprehensive review is done, covering all important areasEach item on the DFM Checklist should be verified on the design being reviewed, either using Valor automated analysis or by manual checkingThe DFM Checklist is a tool to use during the review, it should NOT be included in the DFM Report given to the customerDFM 101 Part1 | Dec 2008 ConfidentialHigher priority items are shown in bold text. If time is limited and a full review cannot be performed, the higher priority items should be cover。