Stainless Steel Door Lock Latch Accessories

Process:

Water glass investment casting + lost wax casting + 5-axis CNC machining

Heat resistance:

Sustained operation above 800°C without structural degradation

Vibration tolerance:

Maintains locking integrity under continuous mechanical shock

Corrosion protection:

Marine-grade and chemical-resistant surface options available

Customization:

100% produced from customer STEP, IGS, PDF, or 2D technical drawings

Applications:

Latch bolts, strike plates, cam mechanisms, bracket fittings, custom lock hardware

Stage

Activity

Output

Engineering Review

Feasibility analysis of drawing for casting and machining

No-Go report

DFM Analysis

Optimize wall thickness, draft angles, gating, cooling

Revised 3D model with cost-saving suggestions

Tooling Design

Design durable aluminum wax pattern tooling

Tooling CAD files for approval

Wax Pattern Production

Inject wax into precision tooling

Dimensionally stable wax replicas

Ceramic Shell Building

Dip wax in ceramic slurry, 4–6 layers

High-strength shell mold

Casting

Pour selected alloy under controlled conditions

Near-net-shape raw casting

Heat Treatment

Stress relief or solution annealing as specified

Optimized metallurgical structure

CNC Machining

5-axis milling, drilling, tapping, grinding

Final dimensions within ±0.05mm

Packaging

Anti-corrosion wrapping, custom labeling, export crating

Shipment-ready lot

Specification

Detail

Casting tolerance

±0.2mm general; ±0.05mm on machined features

Surface finish

Ra 3.2–6.3 µm as-cast; Ra 0.8–1.6 µm post-machined

Heat treatment

Stress relief, solution annealing, quenching & tempering

Surface treatment

Shot blasting, pickling, electropolishing, nickel plating, passivation

Drawing formats

STEP, IGS, PDF, DWG, DXF

Lead time

48-hour DFM feedback; 4–6 weeks standard production

Austenitic stainless steels:

304, 316, 316L, CF8M

Carbon and alloy steels:

20#, 45#, 42CrMo

Cast iron:

WCB

Aluminum alloy:

A356

Custom alloys:

Available upon request with full mill-test certification

Shrinkage risk:

Identify thick sections prone to porosity and recommend rib or core adjustments

Machining access:

Flag undercuts or blind holes that complicate post-cast CNC operations

Draft angle adequacy:

Ensure cast surfaces release cleanly from the ceramic shell

Wall thickness uniformity:

Balance material flow to prevent cold shuts or hot tears

Cost optimization:

Suggest design modifications that reduce alloy consumption without compromising function

Casting tolerance:

±0.2mm on general geometry per ISO 8062 CT4–CT6

Machining tolerance:

±0.05mm on critical mating interfaces using CMM verification

Surface inspection:

100% visual check for cracks, sand adhesion, and cold laps

Dimensional reporting:

Full CMM inspection report with SPC data for every lot

Traceability:

Heat number, batch ID, and inspection records linked to each part