Manufacturing Procedure-制造程序
以下是关于管件及法兰的制造控制程序。这份文件旨在规范从原材料投放至成品入库的全过程质量控制，确保每一道工序都处于受控状态，最终产品符合标准与图纸要求。
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管件及法兰制造控制程序
1. 目的
对管件及法兰的制造过程进行策划和控制，确保生产过程在受控状态下进行，使产品各项质量特性满足规定要求。
2. 适用范围
适用于各类钢制管件（弯头、三通、异径管、管帽等）及钢制法兰从投料、加工到成品入库的全过程控制。
3. 职责
· 生产部门：执行生产计划，实施具体加工，负责设备日常维护。
· 工艺技术部门：编制工艺文件（如工艺卡、作业指导书），解决现场技术问题，进行工艺验证。
· 质量检验部门：负责工序检验（首检、巡检、完工检），监控工艺纪律。
· 设备管理部门：确保设备能力满足工艺要求，定期校准量具和仪器。
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4. 控制程序内容
4.1 生产准备控制
1. 技术文件准备：生产前，必须确认以下文件齐全且有效：
· 产品图纸（或标准样件）。
· 工艺过程卡/作业指导书。
· 检验计划（ITP）。
2. 原材料复核：核对投入的原材料（如钢管、钢板、锻件坯料）是否持有合格标识，材质规格是否与工艺单一致。严禁无标识或不合格材料投入生产。
3. 设备与工装点检：
· 检查主要设备（压力机、推制机、车床、锯床、热处理炉）是否运行正常。
· 检查模具、芯棒、夹具是否完好，尺寸是否符合工艺要求。
4. 环境与安全：确保作业现场整洁，消防设施齐全，特种作业人员（如焊工、行车工）持证上岗。
4.2 热加工成形控制
（适用于热压三通、推制弯头、锻造法兰等）
1. 加热控制：
· 炉温：严格按工艺卡片设定加热温度（如碳钢锻造温度范围通常为800℃-1200℃），并配备自动温度记录仪。
· 时间：控制保温时间，防止过热或过烧。记录实际加热曲线。
2. 成形控制：
· 首件确认：每班次或更换模具后，必须压制首件，经检验合格后方可批量生产。
· 过程监控：监控成形压力、位移速度。观察坯料是否有折叠、裂纹产生。
3. 冷却控制：根据材质要求选择冷却方式（空冷、坑冷、炉冷），特别是合金钢必须执行缓冷，防止产生白点或裂纹。
4.3 焊接控制（适用于有焊缝的产品，如卷制法兰、焊接弯头）
1. 坡口制备：焊接坡口形状、尺寸应符合工艺要求，表面不得有油污、锈蚀。
2. 焊工资格：从事管件法兰焊接的焊工必须持有有效的资质证书，且在有效期内。
3. 焊接材料：焊条、焊丝需按规定烘烤、发放和使用（一般随用随取，放入保温桶）。
4. 过程监控：
· 层间温度：对于有层间温度要求的材料（如不锈钢、耐热钢），需进行测量控制。
· 焊缝外观：每道焊缝完成后，焊工应自检外观，不得有气孔、夹渣、咬边等缺陷。
5. 焊后标识：在焊缝附近打上焊工钢印号，以便追溯。
4.4 热处理控制
1. 工艺执行：严格按热处理工艺卡（正火、回火、退火、调质）设定的温度曲线操作。
2. 装炉方式：确保产品在炉内摆放均匀，受热一致，避免局部变形。
3. 记录：自动记录仪绘制的时间-温度曲线图需由操作员和质检员签字确认，并归档保存。
4. 后处理：热处理后，按规定进行硬度检测，验证热处理效果。
4.5 机加工控制
1. 装夹与定位：确保工件装夹牢固，定位基准准确（如法兰背面为加工基准）。
2. 尺寸精度控制：
· 首件检验：调机后首件必须进行全尺寸检验（包括关键点：密封面、螺栓孔距、壁厚、坡口尺寸）。
· 过程抽检：操作工按规定频次自检，质检员进行巡回抽检。
3. 密封面保护：精加工完成后的密封面，严禁磕碰或划伤，应及时涂油并加装保护罩。
4.6 无损检测控制（如适用）
1. 时机控制：无损检测通常安排在热处理后、精加工前（或按ITP要求）。
2. 人员资质：检测人员必须持有相应方法的II级或III级资格证书。
3. 标准执行：按产品标准（如ASME B16.34， GB/T 12385）或客户要求的验收等级进行检测（UT/MT/PT）。
4. 标记：检测合格部位/产品做相应标记，不合格品按不合格品程序处置。
4.7 标识与可追溯性控制
1. 工序流转卡：每批次产品随附工序流转卡，记录每道工序的操作者、检验员、完成时间及结果。
2. 实物标识转移：切割、加工过程中，若原标识被去除（如切取样坯），必须立即在剩余本体或新本体上恢复标识（移植）。
3. 状态标识：
· 待检区：黄色区域/标识牌。
· 合格品：绿色标识/标签。
· 不合格品：红色标识/标签，并隔离存放。
· 返工品：蓝色标识/标签。
4.8 工艺变更控制
1. 临时变更：如需临时调整工艺参数（如更换原材料供应商、调整加热温度范围），必须由工艺工程师提出申请，经技术负责人审批后方可执行。
2. 永 久变更：涉及产品结构、关键工序的永 久变更，需经过工艺评定或试验验证，并更新相应的工艺文件。
4.9 人员技能控制
1. 岗前培训：新员工或转岗员工必须经过岗位技能培训和安全培训。
2. 特种作业：焊工、无损检测人员、热处理工等必须持有效的特种作业操作证/资格证上岗。
3. 技能矩阵：建立关键岗位人员技能矩阵，确保人员能力与岗位要求匹配。
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5. 制造过程异常处理
1. 发现异常：操作工或巡检员发现过程异常（如尺寸超差、设备报警、表面裂纹）时，应立即暂停生产。
2. 隔离与报告：将可疑产品隔离，并立即报告给班组长和质检员。
3. 评审与处置：
· 可返工：由工艺人员制定返工方案，重新加工后重新检验。
· 不可返工：按废品处理，填写《不合格品报告》。
· 原因分析：查明根本原因（人机料法环），采取纠正措施，防止再次发生。
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6. 支持性文件及记录
· 支持性文件：
· 各产品工艺过程卡
· 焊接工艺评定报告（PQR）及焊接工艺规程（WPS）
· 热处理工艺规范
· 设备操作规程
· 质量记录：
· 生产过程巡检记录表
· 热处理炉温记录曲线
· 无损检测报告
· 工序流转卡
· 不合格品评审处置表
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7. 流程图概览
原材料入库检验
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生产准备 (文件/设备/工装)
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下料/锻造/卷制 (首检确认)
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热加工成形 (控温/控压)
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焊接 (如需要, 焊工/材料/探伤)
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热处理 (监控曲线/硬度)
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机加工 (首检/巡检/密封面保护)
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无损检测 (UT/MT/PT)
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标识/打钢印
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最终检验 (尺寸/外观)
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包装入库
The following is the manufacturing control procedure for pipe fittings and flanges. This document aims to standardize the quality control of the entire process from raw material deployment to finished product warehousing, ensuring that each process is under control and the final product meets the standards and drawing requirements.
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Control Procedure for Pipe and Flange Manufacturing
1. Purpose
Plan and control the manufacturing process of pipe fittings and flanges to ensure that the production process is carried out in a controlled state, so that all quality characteristics of the product meet the specified requirements.
2. Scope of Application
Suitable for the full process control of various steel pipe fittings (elbows, tees, reducers, pipe caps, etc.) and steel flanges from feeding, processing to finished product storage.
3. Responsibilities
·Production Department: Execute production plans, implement specific processing, and be responsible for daily equipment maintenance.
·Process Technology Department: Compile process documents (such as process cards and operation manuals), solve on-site technical problems, and conduct process validation.
·Quality Inspection Department: Responsible for process inspection (initial inspection, patrol inspection, completion inspection), monitoring process discipline.
·Equipment Management Department: Ensure that equipment capabilities meet process requirements and regularly calibrate measuring tools and instruments.
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4. Control program content
4.1 Production Preparation Control
1. Technical document preparation: Before production, it is necessary to confirm that the following documents are complete and valid:
·Product drawings (or standard samples).
·Process card/operation manual.
·Inspection Plan (ITP).
2. Raw material review: Verify whether the input raw materials (such as steel pipes, steel plates, forging blanks) hold qualified labels and whether the material specifications are consistent with the process sheet. It is strictly prohibited to put unmarked or unqualified materials into production.
3. Equipment and tooling inspection:
·Check if the main equipment (press, pusher, lathe, sawing machine, heat treatment furnace) is operating normally.
·Check whether the mold, core rod, and fixture are intact and whether the dimensions meet the process requirements.
4. Environment and safety: Ensure that the work site is clean, fire-fighting facilities are complete, and special operators (such as welders and crane operators) are certified to work.
4.2 Control of Hot Processing Forming
(Suitable for hot pressed tees, push made elbows, forged flanges, etc.)
1. Heating control:
·Furnace temperature: Strictly set the heating temperature according to the process card (such as the forging temperature range of carbon steel is usually 800 ℃ -1200 ℃), and equipped with an automatic temperature recorder.
·Time: Control the insulation time to prevent overheating or overburning. Record the actual heating curve.
2. Forming control:
·First piece confirmation: After each shift or mold replacement, the first piece must be pressed and inspected before mass production can be carried out.
·Process monitoring: Monitor forming pressure and displacement speed. Observe whether the billet is folded or cracked.
3. Cooling control: Select the cooling method (air cooling, pit cooling, furnace cooling) according to the material requirements, especially for alloy steel, slow cooling must be performed to prevent the formation of white spots or cracks.
4.3 Welding Control (applicable to products with welds, such as rolled flanges and welded elbows)
1. Groove preparation: The shape and size of the welding groove should meet the process requirements, and the surface should not have oil stains or rust.
2. Welder qualification: Welders engaged in pipe flange welding must hold valid qualification certificates and be within the validity period.
3. Welding materials: Welding rods and wires need to be baked, distributed, and used according to regulations (usually taken as needed and placed in insulation buckets).
4. Process monitoring:
·Interlayer temperature: For materials with interlayer temperature requirements (such as stainless steel and heat-resistant steel), measurement and control are required.
·Weld appearance: After each weld is completed, the welder should self inspect the appearance and there should be no defects such as porosity, slag inclusion, undercutting, etc.
5. Post weld identification: Mark the welder's steel seal number near the weld seam for traceability.
4.4 Heat treatment control
1. Process execution: Strictly follow the temperature curve set in the heat treatment process card (normalizing, tempering, annealing, quenching and tempering) for operation.
2. Furnace loading method: Ensure that the products are evenly placed in the furnace, heated uniformly, and avoid local deformation.
3. Recording: The time temperature curve graph drawn by the automatic recorder needs to be signed and confirmed by the operator and quality inspector, and archived and saved.
4. Post treatment: After heat treatment, perform hardness testing according to regulations to verify the heat treatment effect.
4.5 Machining Control
1. Clamping and positioning: Ensure that the workpiece is firmly clamped and the positioning reference is accurate (such as the back of the flange as the machining reference).
2. Dimensional accuracy control:
·First article inspection: After machine adjustment, the first article must undergo a full-size inspection (including key points such as sealing surface, bolt hole spacing, wall thickness, and groove size).
·Process sampling: Operators conduct self inspection at the prescribed frequency, while quality inspectors conduct patrol sampling.
3. Sealing surface protection: After precision machining, the sealing surface must not be bumped or scratched. It should be promptly oiled and equipped with a protective cover.
4.6 Non destructive testing control (if applicable)
1. Timing control: Non destructive testing is usually scheduled after heat treatment and before precision machining (or according to ITP requirements).
2. Personnel qualifications: Testing personnel must hold a Level II or Level III qualification certificate for the corresponding method.
3. Standard execution: Testing shall be conducted according to product standards (such as ASME B16.34, GB/T 12385) or customer required acceptance levels (UT/MT/PT).
4. Marking: Mark the qualified parts/products accordingly, and dispose of non-conforming products according to the non-conforming product procedure.
4.7 Identification and Traceability Control
1. Process flow card: Each batch of products comes with a process flow card, which records the operator, inspector, completion time, and results of each process.
2. Physical identification transfer: During the cutting and processing process, if the original identification is removed (such as cutting sample blanks), the identification must be immediately restored (transplanted) on the remaining or new body.
3. Status identification:
·Inspection area: yellow area/signboard.
·Qualified product: Green label/tag.
·Unqualified products: marked in red and stored separately.
·Rework product: blue identification/label.
4.8 Process Change Control
1. Temporary changes: If it is necessary to temporarily adjust process parameters (such as changing raw material suppliers or adjusting heating temperature ranges), an application must be submitted by the process engineer and approved by the technical leader before implementation.
2. Permanent changes: Permanent changes involving product structure and critical processes must undergo process evaluation or experimental verification, and corresponding process documents must be updated.
4.9 Personnel Skill Control
1. Pre job training: New or transferred employees must undergo job skills training and safety training.
2. Special operations: Welders, non-destructive testing personnel, heat treatment workers, etc. must hold valid special operation certificates/qualification certificates to work.
3. Skill Matrix: Establish a skill matrix for key position personnel to ensure that their abilities match the job requirements.
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5. Abnormal handling during the manufacturing process
1. Abnormal discovery: When the operator or inspector discovers process abnormalities (such as size deviation, equipment alarm, surface cracks), production should be immediately suspended.
2. Isolation and reporting: Isolate suspicious products and immediately report to the team leader and quality inspector.
3. Review and disposal:
·Reworkable: The process personnel shall develop a rework plan, reprocess and re inspect.
·Non reworkable: Dispose of as scrap and fill out the 'Non conforming Product Report'.
·Cause analysis: Identify the root cause (human, machine, material, method, and environment), take corrective measures to prevent recurrence.
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6. Supporting documents and records
·Supporting documents:
·Process cards for each product
·Welding Procedure Qualification Report (PQR) and Welding Procedure Specification (WPS)
·Heat treatment process specification
·Equipment operating procedures
·Quality records:
·Production Process Inspection Record Form
·Temperature record curve of heat treatment furnace
·Non destructive testing report
·Process Flow Card
·Unqualified Product Review and Disposal Form
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7. Overview of the flowchart
Raw material incoming inspection
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Production preparation (documents/equipment/tooling)
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Cutting/Forging/Rolling (First Inspection Confirmation)
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Hot processing forming (temperature control/pressure control)
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Welding (if necessary, welder/material/non-destructive testing)
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Heat treatment (monitoring curve/hardness)
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Machining (initial inspection/patrol inspection/sealing surface protection)
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Non destructive testing (UT/MT/PT)
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Identification/Stamping
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Final inspection (size/appearance)
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packaging and warehousing