过程检验与成品检验的分工

结论：过程检验管「做的对不对」，成品检验管「成的合不合格」

轮椅生产中有两道主要的检验：过程检验和成品检验。

很多企业把两者的关系搞混，出现两种问题：

重复设置。 同一个项目在两处都测，浪费资源。

遗漏设置。 某些项目两处都没管，问题流到最后。

理清关系的关键是明确两者的目的不同：

过程检验的目的是控制工序 ——确认这道工序做对了，可以流到下一道。它关注的是工序的输出是否符合要求。

成品检验的目的是确认产品 ——确认成品符合出厂要求。它关注的是整机的功能、安全和外观。

一个判断原则：装配后测不了或测起来代价大的项目，必须在过程中测。

两者的定位对比

维度	过程检验	成品检验
对象	半成品、工序输出	整机
目的	控制工序	确认产品
时点	每道关键工序后	装配完成后
项目	工序特性	整机特性
频次	首件加巡检	逐台或抽样
不合格处理	返工或隔离	返修或报废

过程检验的不合格处理成本低于成品检验 ——工序中发现问题只影响这道工序，装配完成后发现问题可能要拆解。

过程检验该管什么

焊接工序。 焊缝外观、焊接参数、必要时的焊缝质量抽检。焊缝在喷涂后看不清，所以必须在喷涂前检。

管件加工。 切割长度、弯管角度与半径、开孔位置。

表面处理。 前处理状态、涂层厚度、附着力。涂层的附着力在成品上不便测，过程中测更合适。

车架装配。 关键尺寸、对称性、平行度。

部件预装。 转动灵活性、间隙、配合。

缝纫工序。 针距、缝线强度、接缝质量。

电气装配。 接线正确性、绝缘、接地连续性。接线在外壳装上后不便检查。

「喷涂前的焊缝检查」和「装外壳前的接线检查」是典型的过程必检项 ——过了这道工序就检查不了了。

成品检验该管什么

外观与标识。 整机外观、标识的完整与正确。

尺寸。 整机的主要尺寸。

质量。 整机重量。

功能。 折叠、调节、制动、转向、各功能件的动作。

电气安全。 漏电流、绝缘（电动产品）。

电气功能。 开机、调速、电量显示、充电、保护功能。

稳定性。 抽样做静态稳定性。

制动。 制动效能的检查。

随机文件。 说明书、合格证、保修卡。

成品检验的重点是「整机才能体现的特性」 ——各部件单独合格不代表整机合格，装配的质量和部件间的配合只有在整机上才能验证。

衔接的要点

避免重复。 过程中已确认且后续工序不影响的，成品不必重复。

避免遗漏。 明确每个特性由哪道检验负责。

记录的传递。 过程检验的记录要能追溯到成品。

不合格的处理。 过程发现的不合格不应流到成品检验。

信息的反馈。 成品检验发现的问题要反馈到相应工序。

「明确每个特性由哪道检验负责」是避免遗漏的做法 ——列出所有需要控制的特性，逐一指定责任检验点，没有指定的就是遗漏。

首件与巡检

过程检验通常包括两种：

首件检验。 每批开始、换型、调整后的第一件全面检查，确认设置正确。

巡回检验。 生产过程中按频次抽查，确认过程稳定。

首件的价值在于及时发现设置错误 ——如果设置错了而没有首件检验，可能整批都做错了。

自检、互检与专检

自检。 操作者检查自己的工作，成本最低、反馈最快。

互检。 下道工序检查上道工序，利用了下道工序对上道质量的敏感。

专检。 专职检验员检查，独立性较强。

三者配合使用 ——自检和互检覆盖日常，专检覆盖关键点和抽查。

常见的设置问题

成品检验项目过多。 把本该在过程中控制的项目堆到成品。

过程检验流于形式。 只签字不实际检查。

关键工序没有检验点。 焊接、电气装配这类关键工序漏掉。

记录不能追溯。 检验记录与产品对应不上。

反馈机制缺失。 成品发现的问题不反馈到工序。

常见的准备不足

信息不全。 材料、工艺、使用环境的信息缺失，导致方案设计缺乏依据。

样品不具代表性。 试制样品或挑选样品，与量产状态有差距。

条件未明确。 测试条件没说清楚，数据的适用范围就不明确。

只看初始值。 忽略了环境和时间作用后的性能变化。

项目不完整。 遗漏了必要的项目，提交时才发现。

这五项在实际委托中出现频率较高，建议在项目启动时逐项确认，因为它们造成的返工成本远高于事前确认所花的时间。

数据的组织与保存

记录的完整性。 条件、方法、设备、样品状态、实测值。

可追溯性。 数据与样品批次、生产批次的关联。

保存期限。 覆盖产品的生命周期。

检索的便利。 需要时能快速定位。

版本的管理。 数据更新时的版本控制。

建议建立统一的数据台账，记录每组数据的来源、条件、适用范围和有效期。数据积累起来之后，后续的产品开发和变更评估都能受益。

与整体工作的衔接

这部分工作不是孤立的，它与几项内容相关：

与设计的衔接。 数据是设计决策的依据，也是设计验证的证据。

与风险管理的衔接。 识别出的风险点应当有对应的验证。

与变更管理的衔接。 变更时判断是否需要重新验证。

与生产控制的衔接。 关键参数的控制限值来自验证数据。

与售后的衔接。 失效分析需要原始数据作为对照。

建议在项目规划时就把这些衔接关系理清楚，避免各环节各做各的、数据无法互相支撑。

我们的做法

企业委托我们做检测时，我们会区分哪些数据适合作为过程控制的依据，哪些是成品或型式检验的内容。

对于焊缝质量、涂层附着力、材质这类过程相关的项目，我们建议在对应工序后送检，而不是等到整机完成，因为整机上取样困难且成本高。

如果成品或型式检验中发现问题，我们会提供尽可能详细的失效信息，便于企业定位到具体的工序。

如果你在梳理过程检验和成品检验的分工，需要检测角度的参考，可以直接联系：132 4819 8029。检测能力见服务介绍，产品分类见手动轮椅检测与电动轮椅检测，标准信息见标准查询。

English version

Conclusion. Wheelchair production involves two principal inspections: in-process and final. Many manufacturers confuse their relationship, producing two problems. Duplication tests the same item in both places, wasting resources. Omission leaves some items covered in neither, so problems flow through to the end. The key to sorting this out is recognising that the two have different purposes. In-process inspection controls the operation, confirming that this step was done correctly and may flow to the next, concerning itself with whether the operation's output meets requirements. Final inspection confirms the product, establishing that it meets shipping requirements, concerning itself with the whole product's function, safety and appearance. One rule decides: items that cannot be tested after assembly, or that are costly to test then, must be tested in process.

Comparing the two. In-process inspection examines semi-finished items and operation outputs, final inspection the whole product. In-process controls the operation, final confirms the product. In-process occurs after each key operation, final after assembly. In-process covers operation characteristics, final whole-product characteristics. In-process uses first-article plus patrol checks, final unit-by-unit or sampling. And in-process non-conformance means rework or segregation, final means repair or scrapping. Non-conformance costs less to handle in process: a problem found during an operation affects only that operation, while one found after assembly may require dismantling.

What in-process inspection covers. Welding requires weld appearance, welding parameters and, where relevant, sampled weld quality, and must be inspected before painting since welds cannot be examined afterwards. Tube fabrication requires cut length, bend angle and radius, and hole positions. Surface treatment requires pre-treatment condition, coating thickness and adhesion, and adhesion is awkward to measure on a finished product so is better measured in process. Frame assembly requires key dimensions, symmetry and parallelism. Component pre-assembly requires freedom of rotation, clearance and fit. Sewing requires stitch length, seam strength and seam quality. And electrical assembly requires correct wiring, insulation and earth continuity, since wiring is awkward to inspect once the covers are on. Weld inspection before painting and wiring inspection before enclosure are the archetypal must-inspect-in-process items, because the opportunity is gone once the operation passes.

What final inspection covers. Appearance and marking, covering the whole product's appearance and the completeness and correctness of markings. Dimensions of the whole product. Mass of the whole product. Function, covering folding, adjustment, braking, steering and the operation of each functional component. Electrical safety, covering leakage and insulation on powered products. Electrical function, covering power-up, speed control, charge indication, charging and protective functions. Stability, sampling static stability. Braking effectiveness. And accompanying documents, covering instructions, conformity certificates and warranty cards. Final inspection concentrates on characteristics only the whole product exhibits: individually conforming components do not guarantee a conforming product, and assembly quality and inter-component fit can be verified only on the whole.

Linking the two. Avoid duplication, since items confirmed in process and unaffected by later operations need not be repeated. Avoid omission by establishing which inspection owns each characteristic. Carry records forward so that in-process records trace to the finished product. Handle non-conformance so that in-process failures do not reach final inspection. And feed information back so that problems found at final inspection reach the responsible operation. Assigning each characteristic to an owning inspection is how omission is avoided: list every characteristic needing control and assign each a responsible inspection point, and anything unassigned is an omission.

First article and patrol. In-process inspection generally takes two forms. First-article inspection examines the first item of each batch, changeover or adjustment comprehensively, confirming the setup is correct. Patrol inspection samples during production at a set frequency, confirming the process is stable. First-article inspection earns its place by catching setup errors promptly: without it, a wrong setup may mean a whole batch made wrongly.

Self, successive and dedicated inspection. Self-inspection has operators check their own work, costing least with the fastest feedback. Successive inspection has the next operation check the previous one, exploiting its sensitivity to upstream quality. Dedicated inspection uses inspectors, offering the best independence. Use all three together, with self and successive inspection covering routine work and dedicated inspection covering key points and sampling.

Common configuration problems. Too many items at final inspection, piling up work that belongs in process. In-process inspection as a formality, signed but not performed. Key operations without inspection points, with welding and electrical assembly omitted. Records that do not trace, failing to correspond to products. And missing feedback, with problems found at final inspection not returning to the operation.

How we handle it. Where manufacturers commission testing we distinguish which data suit process control and which belong to final or type testing. For weld quality, coating adhesion and material identity we suggest submission after the corresponding operation rather than waiting for a complete product, since sampling from a whole product is difficult and costly. Where final or type testing finds a problem we provide failure information in as much detail as we can, to help locate the responsible operation.

If you are working out the division between in-process and final inspection and want a testing perspective, get in touch: +86 132 4819 8029.