Engineering & Design
Engineering & Design — Calculation-Driven Machine Sizing, PTFE Tooling & Hydraulic Circuit Engineering
At HEMSUN, machine and tooling design begins with mathematical calculations rather than guesswork. Our engineering team sizes every press from first principles: application requirements dictate PTFE compound selection and required compaction stress (typically 20–25 MPa for generic PTFE; up to 35 MPa for heavily filled grades); required press tonnage is derived strictly via F = P × A; and hydraulic cylinder bores, pumps, and motors are engineered as a synchronized system using Pascal's Law. High-efficiency dual-pump hi-lo circuits provide fast idle approach while cutting motor power demand during final compression, where pressing speed is strictly governed to 5–10 mm/sec to prevent air entrapment in fine PTFE powders. Every system is built on our core philosophy—Excellence Drives Success—delivering quality and reliability as our primary client retention strategy.
Applications
- First-principles engineering design for custom PTFE compression moulding presses (6 Ton to 600 Ton) and multi-cavity compaction tooling.
- Hydraulic circuit sizing and manifold block engineering featuring dual-pump hi-lo circuits and proportional pressure control.
- Custom machine design integrations including gunmetal guide bushings with forced oil-injection lubrication, safety light curtains, and PLC recipe management.
- Non-optical, magnetic linear scale positioning systems engineered specifically for dust-heavy powder compaction environments where optical encoders fail.
- Applied R&D, tooling FEA analysis, and preform prototyping for new polymer compounds and challenging component geometries.
Scope and process
Calculation-driven design sequence at HEMSUN: (1) Review component 2D/3D geometry and target sintering cycle to determine green density requirements and specific compaction pressure (MPa) per resin datasheet or empirical trial; (2) Calculate total press force F = P × A across projected die cavity area; (3) Apply Pascal's Law (P = F / A_cyl) to determine main hydraulic cylinder bore, rod diameter, and system operating pressure (up to 250–315 bar); (4) Size dual-pump hydraulic power unit (high-volume pump for fast approach/return, low-volume high-pressure pump for tonnage dwell, minimizing motor kW load); (5) Integrate non-optical linear scales, gunmetal guide bushes with forced oil lubrication, and PLC multi-stage dwell profiling; (6) Complete 3D CAD modeling, FEA frame deflection verification, and toolroom prototype validation.
Materials we work with
Machine frame weldments utilize ultrasonic-tested IS 2062 Grade E250/E350 structural steel, stress-relieved prior to multi-axis CNC machining. Tie-bars and cylinder rams are forged from EN-8/EN-19 alloy steel, induction hardened (50–55 HRC), and hard chrome plated (30–50 µm). Guide bushings are cast from heavy-duty phosphor bronze/gunmetal (CuSn10Pb10 / LG2) with engineered grease/oil distribution spiral grooves.
Tooling support
Design output includes the tooling definition needed to make the part, not only the part drawing.
Choosing the right option
When initiating a custom machine or tooling engineering project with HEMSUN, provide target component dimensions, annual production volume, preferred polymer or powder grades, and available utility power supply. Our engineering department develops detailed machine calculations, 3D GA concept drawings, and comprehensive commercial proposals within 24–48 hours.
Quality checks and inspection
Designs are checked against manufacturability before release, so the drawing can actually be cut. Dimensions are verified on CMM against the drawing; a mill test certificate accompanies material despatch.
Commissioning and handover
HEMSUN provides complete turnkey commissioning: mechanical leveling and vibration isolator anchoring, hydraulic line flushing with ISO VG 68 fluid, electrical power hookup, calibration of non-optical linear scales and pressure transducers, and comprehensive operator training on PLC cycle programming.
Export packing and lead time
Deliverables are issued as drawing files and models in the formats your team works in. HEMSUN is a DGFT IEC registered exporter (Government of India).
Maintenance and spare parts
Revisions are tracked so the manufactured part always ties back to a specific issue.
Specifications
| Property | Value |
|---|---|
| Typical PTFE Compaction Pressure | 20 to 25 MPa (Virgin) / up to 35 MPa (Filled Compounds) |
| Compression Stroke Speed | 5 to 10 mm/sec (governed to prevent air entrapment) |
| Hydraulic Circuit Architecture | Dual-Pump Hi-Lo Circuit (High-flow low-P approach + Low-flow high-P compression) |
| Position Feedback Instrumentation | Non-Optical / Magnetic Linear Scale (immune to polymer powder dust) |
| Guide Bushing & Column Architecture | Custom Gunmetal Bushings with Integrated Oil-Injection Lubrication |
| Safety & Interlock Integration | Dual-Channel Safety Light Curtains + Hydraulic Pressure Switches + Monitored E-Stop |
| Automation & Control Stack | Programmable Logic Controller (PLC) with Digital Touchscreen HMI & Multi-Stage Dwell Recipes |
| Design & Validation Origin | In-House Engineering Department at Dahegam, Gandhinagar, Gujarat, India |
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Frequently Asked Questions
How does HEMSUN calculate hydraulic press tonnage for PTFE compaction?
Machine tonnage is derived strictly from first principles using F = P × A, where P is the material's required compaction stress (typically 20–25 MPa for virgin PTFE, up to 35 MPa for filled compounds) and A is the total projected die cavity cross-sectional area. We add a 15–20% safety margin for continuous production duty.
Why does HEMSUN utilize a dual-pump hi-lo hydraulic circuit?
Dual-pump hi-lo circuits utilize a high-volume low-pressure pump for rapid idle platen closing (50–100 mm/s) and automatically unload to a low-volume high-pressure pump during final compression and tonnage dwell. This architecture reduces electric motor kW requirements by 40–60%, lowering energy costs and hydraulic oil heat generation.
Why is compaction speed restricted to 5–10 mm/sec for PTFE powder preforming?
Granular PTFE resin contains high volumes of entrapped air (bulk density 450–550 g/L vs compacted density ~2.16 g/cm³). Governing compression velocity to 5–10 mm/sec allows air to exhaust through tooling micro-bleeds (0.025–0.035 mm), preventing powder fluidization, trapped air pockets, and green billet delamination.
Why does HEMSUN specify magnetic linear scales instead of optical encoders?
Polymer and powder compaction press environments generate airborne particulate dust. Optical glass scales quickly fail due to dust coating the optical reader head. Non-optical magnetic linear scales operate via magnetic field sensing (IP67 sealed) and remain 100% immune to polymer dust and hydraulic oil mist.
Ready to Put Your Drawing Into Production?
Send your specification and our engineering team will scope your PTFE components, hydraulic machine, or turnkey project — no obligation.
- Quote response within 24 hours
- Built entirely in our own facility
- Export documentation included
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Tell us what you need — material, drawing, or sample — and we'll follow up with pricing and lead time.
Contact HEMSUN +91-9979593687