Ambiguous technical‑specification causes cross‑border mold‑project disputes. A complete specification document covers material, heat‑treatment, surface treatment, cooling, vent, acceptance‑test and deliverables for LPDC, gravity and CPC counter‑pressure casting mold procurement.
Insert material specification: specify steel‑grade (standard‑H13 or H13‑MOD), impurity‑element limit, forging class and non‑destructive‑inspection requirement. Require material certificate and inclusion rating report for EV structural‑part mold procurement document.
Heat‑treatment requirement: define quenching‑tempering process target, multi‑point hardness window HRC42‑47, allowable hardness deviation ±2 HRC. Clarify stress‑relief requirement after rough‑machining for all split‑insert components for CPC counter‑pressure casting mold.
Nitriding technical index: effective nitriding‑layer thickness 0.08‑0.12 mm, limit brittle compound‑layer ≤8 μm. Specify forbidden over‑nitriding; require nitriding inspection report including layer‑thickness measurement data for gravity casting mold.
Cavity surface quality: define target Ra range for different zones, draft‑angle requirement for undercut or high‑sticking‑risk area. Explicitly prohibit grinding‑notch and sharp inner‑corner root; define minimum fillet radius for all cavity inner corners for LPDC casting mold.
Cooling‑system specification: cooling‑channel position tolerance, channel‑to‑cavity‑surface distance range, pressure‑tight‑test parameter (0.8 MPa hold 30 min zero‑leak). Require flow‑rate target value for each independent cooling‑circuit for aluminum casting mold.
Vent‑system requirement: vent‑slot clearance 0.08‑0.12 mm, single‑channel width, total vent‑area ratio versus casting projected‑area. Clarify vent‑insert material & nitriding requirement; forbid using assembly‑gap as substitute for dedicated vent‑slot structure for EV structural‑part mold.
Assembly requirement: insert mating‑surface flatness tolerance, bolt torque‑value table for all clamping fasteners, gap‑control requirement for split‑insert mating faces. Define CMM cold‑state inspection environment condition (20±2 ℃ ambient temperature) for CPC counter‑pressure casting mold.
Pre‑delivery acceptance‑test items: cooling‑circuit leak‑test, cold‑state CMM inspection, minimum 25‑shot thermal‑balance trial‑test. Specify trial‑test parameter recording list, stable‑stage casting‑sample requirement, defect‑statistics and sample‑dissection or XCT‑inspection rule for gravity casting mold.
Deliverable‑document list: material certificate, heat‑treatment & nitriding report, Procast CAE simulation files, CMM inspection report, trial‑test record, 2D drawing set and 3D neutral‑format assembly‑model. Clarify document language requirement for overseas foundry end‑user for LPDC casting mold.
Conditional‑acceptance rule: define classification for critical‑defect and minor‑non‑conformity. Critical mold‑structure defect prohibits unconditional‑acceptance; minor‑non‑conformity must record corrective‑action item, responsible‑party and clear completion deadline for cross‑border mold‑project.
Mold‑packaging & transportation requirement: anti‑rust protection for cavity surface, insert fixation to avoid collision‑impact during ocean‑shipping. Require cavity‑surface protective cover; specify inspection requirement after customer receiving unpacking operation for aluminum wheel mold.
After‑sales technical‑support boundary: define warranty scope excluding melt abuse, wrong process‑parameter and improper on‑site‑maintenance. Clarify remote‑support mechanism and spare‑part supply lead‑time requirement for EV structural‑part mold overseas‑project cooperation.
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FAQ
Q: What hardness‑window and deviation are specified for H13 insert in technical‑specification?
