Machining allowance should match the casting route, material, wall section, and distortion risk
Machining Support Guide
Machined Castings After Casting: What OEM Buyers Should Review First
For many OEM metal casting projects, the risk is not only whether the part can be poured. The buyer and foundry should review machining allowance, datum faces, bores, sealing surfaces, distortion risk, inspection points, and packing requirements before the quotation is treated as final.
公開日: 2026年6月24日更新日: 2026年8月10日
プロジェクト画像
Machining Should Be Reviewed Before The Casting Route Is Fixed
A casting that looks acceptable before machining can still fail commercially if the machining faces, datums, allowance, wall sections, or inspection requirements were not discussed early. For drawing-based OEM projects, casting and machining should be reviewed as one manufacturing package.
Datum faces, bores, sealing surfaces, slots, keyways, and mounting faces should be identified before quotation
Inspection requirements should cover both as-cast features and machined dimensions
The first RFQ package should include drawings, 3D models if available, machining notes, quantity, and target inspection expectations
検討項目
What Buyers Should Confirm Before Requesting A Machined Casting Quote
The best early review connects casting, machining, and inspection. These checks make the quotation more useful and reduce surprises during trial orders.
Critical machined faces: sealing faces, mounting faces, flange faces, bearing seats, and reference surfaces
Datum strategy: where the part will be located for machining and how casting variation may affect setup
Machining allowance: enough stock for stable machining without creating unnecessary weight or cost
Dimensional risk: distortion, shrinkage, wall transitions, rib areas, and thin sections near machined surfaces
Inspection package: material checks, dimensional reports, hardness, machined-surface checks, and export packing requirements
要点
プロジェクト適合性の概要
対象プロジェクト、検討範囲、RFQに必要な情報をまとめています。
調達の焦点
実際の調達課題に沿った実務的な情報
RFQの出発点
図面、数量、材質方針、機械加工条件
プロジェクト対応
図面検討、工程協議、検査、納入調整
対象
OEM購買、調達担当、技術評価チーム
RFQ要点
検討を進めるためのRFQ資料
材質、鋳造工程、機械加工、検査を一体で検討できるよう、次の情報をご用意ください。
2D図面と、利用可能な場合は3Dデータ
部品用途、使用条件、仕向け市場
材質規格または材質の方向性
数量、年間需要、試作注文計画
機械加工範囲、重要公差、検査要件
Buyer FAQ
Questions Buyers Ask About Machined Castings
These answers help buyers prepare a stronger RFQ when the casting also needs CNC machining and dimensional inspection.
Should machining requirements be sent with the first casting RFQ?
Yes. Machining faces, datum requirements, bores, sealing surfaces, keyways, and inspection points can change the casting route, allowance, cost, and delivery plan. They should be reviewed before quotation.
What files are most useful for machined casting review?
A 2D drawing, 3D model if available, marked machining surfaces, tolerance notes, material direction, quantity, annual demand, and inspection expectations are the most useful starting package.
Can a foundry quote casting first and machining later?
It is possible, but it can create risk. If the final part needs controlled dimensions, it is safer to review casting and machining together so allowance, datums, and inspection scope are aligned.
Which parts usually need this combined review?
Pump bodies, valve bodies, motor housings, machine tool beds, gearbox housings, pulley bodies, bearing seats, covers, frames, and structural castings often need machining and inspection review together.
RFQ要点
Need Casting And Machining Reviewed Together?
Upload the drawing, 3D model, machining notes, quantity plan, and inspection requirements so Hongsen can review casting route, machining allowance, datum strategy, and quotation readiness.