Inner Skin: Burr Height ≤0.1mm, Thickness Tolerance ±0.1mm

Component Specifications

Definition

The inner skin is a precision-formed sheet metal component that serves as the interior structural layer of door panels in industrial machinery. It provides dimensional stability, supports interior insulation or lining materials, and interfaces with hinges, latches, and other door mechanisms. This component is critical for maintaining door geometry, distributing mechanical loads, and ensuring proper sealing when closed.

Working Principle

The inner skin functions as a load-bearing structural element that transfers forces from door operation to the frame while maintaining panel flatness. It works in conjunction with the outer skin to create a rigid sandwich structure, with insulation material often placed between layers. The component's formed features (ribs, flanges, embossments) enhance stiffness and provide attachment points for hardware.

Materials

Cold-rolled steel (CRS) SPCC/SPCD, thickness 0.8-1.5mm; Aluminum alloy 5052-H32, thickness 1.0-2.0mm; Galvanized steel SGCC, thickness 0.7-1.2mm; Stainless steel 304, thickness 0.6-1.0mm for corrosive environments.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flatness	≤1.5mm/m²
Burr Height	≤0.1mm
Surface Roughness	Ra ≤ 1.6μm
Thickness Tolerance	±0.1mm
Corrosion Resistance	Salt spray test ≥ 72h (for coated versions)
Hole Position Tolerance	±0.2mm

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 2768-m, DIN 6930, ISO 9013, DIN 8580

Parent Products

This component is used in the following industrial products

Door Panel

A door panel is the main body component of an insulated chamber door, forming the barrier that seals the chamber opening.

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Insulated Panels

Prefabricated building panels with thermal insulation properties used as wall and roof elements in tunnel housing structures.

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Engineering Analysis

Risks & Mitigation

Corrosion in humid environments
Fatigue cracking at stress concentration points
Dimensional distortion during welding
Galvanic corrosion with dissimilar metals
Vibration-induced loosening of attachments

FMEA Triads

Trigger: Inadequate corrosion protection
Failure: Progressive rusting reduces structural integrity
Mitigation: Apply appropriate coatings (zinc plating, powder coating), use corrosion-resistant materials, ensure proper drainage

Trigger: Stress concentration at sharp corners
Failure: Fatigue cracking during repeated door operation
Mitigation: Implement generous radii (R≥3t), add reinforcement ribs, optimize material thickness distribution

Trigger: Thermal expansion mismatch with outer skin
Failure: Panel warping or buckling
Mitigation: Use compatible materials, design expansion slots, implement floating attachment points

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-m: linear dimensions ±0.3mm, angular ±1°, flatness 0.3mm per 100mm

Test Method

Dimensional inspection via CMM, flatness measurement with surface plate and dial indicator, corrosion testing per ISO 9227, vibration testing per IEC 60068-2-64

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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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Inner Skin

Manufacturer profiles associated with Inner Skin.

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Frequently Asked Questions

What is the primary function of an inner skin in door panels?

The inner skin provides structural rigidity, supports interior materials, maintains dimensional stability, and serves as an attachment surface for door hardware and mechanisms.

How does inner skin thickness affect door performance?

Thicker inner skins increase stiffness and load-bearing capacity but add weight; thinner materials reduce weight but may require additional reinforcement ribs. Optimal thickness balances structural requirements with weight constraints.

Can inner skins be repaired if damaged?

Minor dents can often be straightened, but significant damage typically requires replacement due to compromised structural integrity. Repair welding is possible but may affect dimensional accuracy and corrosion resistance.

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.

Inner Skin