Our Manufacturing Process
At Elegant Mark Engineering, every screw barrel and component is crafted with precision, durability, and performance in mind. Our state-of-the-art facility integrates advanced machinery, skilled manpower, and strict quality control to deliver products that meet global standards.
Raw Material Selection
We source only premium-grade alloy steels such as 38CrMoAlA, EN41B, H13, 0.2379, etc ensuring high wear resistance and toughness.
- Rigorous supplier evaluation.
- Material testing with chemical & mechanical certifications.
Forging & Rough Machining
To ensure strength and dimensional stability, billets undergo controlled forging before rough turning.
- Forging improves grain flow and durability.
- CNC turning for precise geometry.
Deep Hole Drilling & Gun Drilling
High-accuracy gun drilling machines are used for screw & barrel bores, ensuring concentricity and smooth finish.
- Bore tolerance within microns.
- Ready for nitriding or bimetallic lining.
Grinding & Honing
After drilling, the inner surfaces undergo precision grinding and honing to achieve the required smoothness and dimensional accuracy.
- Achieves surface finish up to Ra 0.3 – 0.5 µm
- Improves wear resistance and ensures uniform plastic flow
- Guarantees perfect alignment and concentricity
Heat Treatment & Hardening
Our components undergo advanced treatments for extended service life:
- Nitriding (900–1000 HV hardness)
- Vacuum heat treatment for dimensional accuracy
- Bimetallic alloy hardfacing for wear & corrosion resistance
Precision Machining
CNC lathes, milling, and grinding machines ensure every screw flight, barrel groove, and sealing surface is manufactured to exact specifications.
- Flight depth accuracy ±0.01 mm
- Mirror finish for smooth plasticizing
Polishing Process
After machining, screws undergo manual and machine polishing to refine flight edges and improve melt flow characteristics.
- Removes micro-burrs and machining marks
- Achieves high-gloss finish up to Ra 0.2 – 0.4 µm for reduced friction
- Enhances wear resistance and plasticizing efficiency
Surface Coatings & Cladding
Depending on application, we provide specialized coatings:
- Tungsten Carbide, Nickel Alloy, PTA Welding
- Hard Chrome Plating, PVD & other wear-resistant layers
Quality Inspection & Testing
Every product undergoes 100% dimensional and hardness testing.
- Ultrasonic & magnetic particle inspection
- Hardness test (Rockwell & Vickers)
- Trial assembly for perfect fitting
Final Assembly & Dispatch
Finished screw barrels, plungers, and components are assembled, packed, and dispatched with complete traceability.
- Inspection reports & test certificates provided
- Export-compliant packaging for global delivery
