What Should an RFQ Specify for Copper Centrifugal Casting?
A copper centrifugal casting RFQ should specify the part drawing, copper-alloy designation, rotational axis, inside and outside surfaces, diameter, length, wall, ends, machining allowance, service condition, quantity, inspection, and delivery state. It should state whether the supplier is quoting a rough centrifugal blank, a machined sleeve or tube, a finished liner, or an assembled component. Without that distinction, two prices may describe different products and different risks.
The RFQ should answer why the part is being considered for centrifugal casting. A bushing may need a controlled bore and outside fit. A pressure tube may need wall continuity and a defined leak test. A conductive ring may need alloy and contact verification. A wear liner may need a particular alloy, surface, and repair route. The process and evidence should be matched to the actual function.
Geometry and Axis Inputs
Show the axis from which the part is formed and relate the bore, outside diameter, faces, grooves, and end features to that axis. Include length, minimum finished wall, section changes, flanges, keyways, cross holes, chamfers, threads, and any surfaces that will remain as cast. Identify which dimensions are cast-envelope requirements and which are final machined requirements.
For a long sleeve, describe the support and free-state measurement. For a ring, show the relationship between faces and bore. For a tube, identify pressure and fluid-contact surfaces. For a liner, show seal grooves, wear faces, and replacement interfaces. These details allow the supplier to evaluate mold, pouring, solidification, machining stock, fixtures, and inspection locations.
RFQ section | Information to provide | Why it affects the quote |
|---|---|---|
Part geometry | Axis, diameters, wall, length, ends, grooves, and sections | Determines mold, blank, stock, support, and inspection |
Material | Exact alloy, condition, standard, and approved alternatives | Changes melt, casting, machining, service, and records |
Finished scope | Blank, turning, boring, facing, drilling, finish, or assembly | Separates casting price from usable-part price |
Acceptance | Dimensions, internal quality, leak, wear, contact, and reports | Defines evidence, sampling, and disposition work |
Material and Service Inputs
State the alloy designation and any required material records. Include the fluid, pressure, temperature, load, motion, lubrication, conductivity, corrosion exposure, mating metals, and maintenance conditions that apply. If the part is a pressure boundary, identify the boundary. If it is a bearing or wear feature, identify the working surface. If it is a conductive component, identify the contact zones and the property that must be checked.
If an alternative alloy may be considered, state whether prior approval is required and what comparison evidence must be supplied. Do not leave the supplier to infer whether strength, wear, conductivity, corrosion, machinability, or cost is the primary decision. The selected alloy should be compatible with the centrifugal route and the downstream machining and finish.
Link the RFQ to the centrifugal casting service with the complete part scope. When a finished bore, face, groove, or thread is required, include the post-machining service in the same quote request.
Inspection and Test Boundaries
Separate the rough-blank inspection from the finished-part inspection. The blank may need an envelope, wall, and visual review before machining. The finished part may need dimensions, axis relationship, bore, surface, cleanliness, leak, pressure, wear, or contact checks. If an internal examination or section is required, specify the location and acceptance basis. A generic certificate does not prove every feature in a complex tube or liner.
Define sample quantity, inspection frequency, report content, and what happens when a result is outside the drawing. State whether a trial is for process development, first approval, or production release. If the service or geometry changes, identify which evidence must be repeated. This prevents a prior result for a short ring from being applied to a long pressure tube without review.
Commercial Scope and Exclusions
Ask the supplier to separate material, mold or tooling, casting, rough cleaning, machining, deburring, finishing, inspection, testing, packaging, and freight where practical. Identify whether tooling ownership, spare blanks, repair, samples, and nonconformance handling are included. State the target quantity, annual demand if known, batch size, and prototype or production status. Do not compare a blank-only quote with a finished-component quote as if they were equivalent.
Request the supplier's assumptions in writing: alloy, cast envelope, machining stock, support, tolerance basis, finish, test condition, and packaging. The RFQ is complete when a buyer can compare the proposed process, finished scope, evidence, and exclusions without guessing what “centrifugal casting” includes. That clarity is the main commercial value of the document.
Add the revision level and sample-approval route to the request. If the first article is accepted only as a machining blank, say that a finished-part approval remains open. If the supplier is responsible for the final tube or liner, require the machining, cleaning, and functional checks in the same commercial scope. This avoids treating development evidence as production release evidence and keeps later change control tied to the correct part state.
