Geometric features (linear dimensions/geometric tolerances) comply with ISO 2768 standards. Linear dimensions default to ISO 2768-1 medium class (m-class), with metal part tolerances of ±0.2 mm (for >6–30 mm ranges) and non-metal materials relaxed to ±0.5 mm (c-class). Special requirements must be explicitly specified.

Machined surface roughness is typically controlled within Ra 3.2 μm, with cutting textures exhibiting concentric or spiral patterns.

All sharp edges are chamfered and deburred unless explicitly marked as retained edges on drawings.

Optical-grade polymers may exhibit light-scattering effects post-machining; RT recommends polishing to enhance transmittance.

Sheet Metal Fabrication

• Bending calculations use neutral layer algorithms, with standard unfolding coefficients of 0.45T. High-ductility materials require coefficient adjustments based on empirical data.

• Minimum spacing between consecutive stamped features must exceed 3× material thickness. Die clearance is maintained at 8–12% of material thickness.

• Laser-cut heat-affected zone (HAZ) width correlates positively with material thermal conductivity. Typical HAZ for 304 stainless steel is 0.15–0.3 mm.

• Flanged holes require pre-punched diameters ≥1.2× material thickness, with flange heights ≤0.8× hole diameter.

• Welding distortion compensation employs pre-cambering, reserving 0.8–1.2 mm shrinkage allowance per meter.

• All cut edges undergo default deburring. Critical edges requiring sharp retention must be specified on drawings.

Non-Standard Forming Processes

• Closed-loop rolling (closed diameter ≤5T)

• Multi-stage bending (angular tolerance <±1°)

• Compound stamping (step accuracy >IT10)

• Special-profile welding (penetration control <0.3T)

These processes initiate concurrent DFM engineering. Our technical team provides feasibility reports within 48 hours, accompanied by tiered quotations (including rapid prototyping and mass production options).

Silicone mold replication accuracy meets CT8 class, with single-part dimensional variation of ±0.3% or ±0.25 mm (whichever is larger).

Resin flow velocity in gating systems is limited to ≤0.8 m/s to prevent turbulence-induced bubbles.

Recommended draft angles: ≥1° (standard), increasing to 3° for deep cavities with mold-release agents.

Thin-wall regions (<2 mm) require reinforcing ribs with height-to-thickness ratios ≤5:1.

Post-curing temperature gradients are controlled at 3°C/min to minimize warping

Plastic Injection Molding

• Mold fabrication follows ISO 2768 with baseline tolerances of ±0.13 mm (±0.005 in). Shrinkage compensation adds ±0.05% per mm (±0.002 in per inch). Special tolerances require engineering validation.

• RT implements steel-safe margins, reserving 0.1 mm finishing allowances on functional features. Production repeatability is ±0.1 mm (±0.004 in).

• First-article delivery timelines commence upon mold acceptance. Mass production schedules are confirmed post-approval. Initial samples typically include 5–10 parts, varying with cavity layout and material properties.

Notes:

Color matching uses RAL standards; Pantone equivalents may exhibit chromatic deviations.

Quotations include default DFM requirements: draft angles ≥1°, radii ≥0.5 mm.

Gating/ejection systems follow DFM analysis recommendations.

Heating plate temperature uniformity: ±5°C. Preheat duration: 60 seconds per mm thickness.

Forming pressure gradient: 0.2–0.8 MPa/s, with ≤5% fluctuation during dwell phase.

Cooling rate: ≤10°C/min, with auxiliary heat sinks for complex geometries.

Springback compensation is calculated using elastic modulus data. Glass-filled materials maintain ≤0.5° springback.

Multi-layer composites require intermediate venting layers with interlamellar pressure ≥0.6 MPa.