PTFE Compression Moulds
PTFE Compression Moulds — Tool Steel Metallurgy, Cavity Precision & Shrinkage Allowance Engineering
HEMSUN ENGG. INDUSTRIES engineers and manufactures custom ptfe compression moulds in Dahegam, Gandhinagar, Gujarat, India for PTFE compression moulding, powder metallurgy, technical ceramics, and composite forming. CNC-machined from vacuum-hardened AISI D2 and HCHCR tool steel (58–62 HRC) with diamond-polished cavity bores (Ra ≤ 0.15 µm), micro-air venting, and calibrated sintering shrinkage allowances for global processors.
Applications
- Precision compression moulding of PTFE valve balls, seats, gaskets, chevron packings, and bushing billets.
- Uniaxial powder compaction of electrical ceramic insulators, spark plug bodies, and structural ferrite cores.
- High-tonnage powder metallurgy compaction for automotive sintered gears, shock absorber pistons, and bushings.
- Compression and transfer moulding of rubber elastomeric diaphragms, O-rings, and oil seals.
Scope and process
Tooling engineering protocol: 2D part drawing review → calculated thermal contraction and elastic recovery scaling → CNC cavity turning and milling on multi-axis machining centers → vacuum heat treatment → cylindrical and profile grinding → diamond cavity lapping and trial pressing at Dahegam.
Materials we work with
Dies and punches are manufactured from vacuum-degassed AISI D2, high-carbon high-chromium (HCHCR), or premium tungsten carbide inserts. Bolster plates and die retainers utilize stress-relieved medium carbon steel (EN-8/EN-9) to withstand sustained compressive loads.
Tooling support
Punches feature positive relief angles and micro-vented air escape paths to eliminate green preform delamination. Floating core pins reduce die-wall shear friction when compaction ratios exceed 3:1.
Choosing the right option
To request a tooling quotation, submit component 2D/3D drawings with dimensional tolerances, raw powder resin grade (virgin, glass, carbon, bronze-filled), and target daily production volume. Commercial proposals and tooling layout drawings are returned within 24 hours.
Quality checks and inspection
Tooling inspection covers optical coordinate measuring machine (CMM) layout of all cavity profiles, digital surface roughness profilometry (Ra ≤ 0.15 µm), and trial component pressing with green density and sintered dimension reports.
Commissioning and handover
We provide complete tool mounting guidelines, recommended preforming tonnages, dwell cycle recommendations, and on-site tool trial assistance by experienced toolroom specialists.
Export packing and lead time
Export tooling is treated with rust-preventive oil, sealed in moisture-proof vacuum barriers, and crated inside heavy-duty timber boxes compliant with ISPM 15 export regulations.
Maintenance and spare parts
Every die set includes comprehensive maintenance instructions: cavity cleaning with non-abrasive solvents, punch alignment verification protocols, and spare ejector pin replacement packs.
Specifications
| Property | Value |
|---|---|
| Tooling Classification | PTFE Compression Moulds (Series HSE-TOOL-509) |
| Die & Cavity Metallurgy | AISI D2 / EN-31 / HCHCR Vacuum Hardened (58–62 HRC) |
| Cavity Surface Texture | Diamond-lapped mirror finish (Ra ≤ 0.15 µm) |
| Sintering Shrinkage Allowance | Calibrated 1.2% to 3.5% per resin/powder grade |
| Air Venting Architecture | Micro-bleed clearance (0.025–0.035 mm) with perimeter grooves |
| Manufacturing Origin | Engineered & CNC Finished at Dahegam, Gandhinagar, Gujarat, India |
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Frequently Asked Questions
What PTFE die sizes have you built?
Examples include a Ø500 × 100 mm ID × 600 mm hollow-billet die (3-piece split cavity, carbon steel with zinc plating), an SS-304 Ø150 × 60 mm ID × 100 mm billet die with lifting handle, a 550 × 550 × 10 mm two-piece sheet die, EN-31 3-cavity bush dies (OD 73 × ID 46 × 42 mm), and manual bush cavities such as Ø39 × 20 × 120 mm.
Can you make multi-cavity PTFE bush dies?
Yes. Five cavities are practical on a Ø35 mm bush with the 35 Ton fully auto press. Cavity count depends on OD, press tonnage, and fill method.
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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
Request a Quote
Tell us what you need — material, drawing, or sample — and we'll follow up with pricing and lead time.
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