Sprue: Diameter (top) 10-50 mm, Taper Ratio 1:10 to 1:20

Component Specifications

Definition

In precision casting, particularly investment casting and die casting, the sprue is a critical component of the gating system. It serves as the main vertical conduit through which molten metal flows from the pouring basin or cup into the runner system and subsequently into the mold cavities. The sprue's design directly influences metal flow velocity, turbulence, and temperature distribution, impacting casting quality, defect formation, and yield. It is typically tapered to prevent air aspiration and ensure smooth, controlled filling.

Working Principle

The sprue operates on fluid dynamics principles, utilizing gravity or pressure to transfer molten metal. Its tapered design reduces cross-sectional area downward, increasing flow velocity to prevent premature solidification while minimizing turbulence and air entrapment. It ensures directional solidification by controlling thermal gradients.

Materials

Typically made from refractory ceramics (e.g., alumina-silica for investment casting) or high-temperature steel alloys (e.g., H13 for die casting molds). Must withstand thermal shock, erosion, and chemical interaction with molten metals like aluminum, steel, or superalloys.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Taper Ratio	1:10 to 1:20
Diameter (top)	10-50 mm
Surface Roughness	Ra ≤ 1.6 μm
Thermal Conductivity	1-30 W/m·K depending on material

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 8062, DIN 1688

Parent Products

This component is used in the following industrial products

Precision Casting Gating System

Network of channels delivering molten metal to mold cavities in foundry casting.

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Engineering Analysis

Risks & Mitigation

Thermal cracking from repeated heating/cooling cycles
Erosion from high-velocity molten metal flow
Misalignment causing metal leakage or defective castings

FMEA Triads

Trigger: Inadequate taper or diameter
Failure: Turbulent flow leading to porosity and inclusions
Mitigation: Optimize sprue geometry using simulation software (e.g., MAGMA) and adhere to standard taper ratios.

Trigger: Material degradation from thermal cycling
Failure: Cracking or erosion altering flow dynamics
Mitigation: Use high-thermal-shock-resistant materials and implement regular inspection/replacement schedules.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5 mm on critical dimensions per ISO 8062

Test Method

Dimensional inspection via CMM, flow simulation analysis, and metallurgical testing of cast samples.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Sprue

Manufacturer profiles associated with Sprue.

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Frequently Asked Questions

What is the purpose of tapering the sprue?

Tapering prevents air aspiration into the molten metal stream, reduces turbulence, and maintains adequate flow velocity to avoid premature solidification, ensuring complete mold filling.

How does sprue design affect casting quality?

Poor sprue design can cause defects like porosity, cold shuts, or inclusions due to turbulent flow, improper thermal gradients, or gas entrapment, directly impacting mechanical properties and yield.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Sprue