Inspection Fixtures

Working principle and engineering architecture

The engineering principles behind Inspection Fixtures utilize kinematic 3-2-1 locating principles, hardened and ground dowel pins (EN-31 case-hardened to 58–62 HRC), hydraulic and pneumatic swing clamps with sequence valving, zero-point quick-change subplates, and rigid vibration-dampened baseplates ensuring repeatability within ≤ 0.005 mm (5 microns) under heavy cutting tool loads.

Workpiece rigidity and vibration dampening are achieved by modeling cutting tool force vectors during CAD simulation. Primary resting pads are CNC ground to parallelism within 0.005 mm over the entire fixture envelope. Sequence-controlled hydraulic swing cylinders apply uniform holding pressure without inducing part distortion, allowing aggressive roughing cuts and fine finishing in a single setup. For multi-part setups, individual pneumatic part-seating sensors confirm positive contact before spindle cycle start.

Types & Configurations We Build

Functional Testing Fixtures Manufacturer

Functional Testing Fixtures from HEMSUN, India — tooling and turnkey support for PTFE and powder lines. Worldwide project support; send drawings.

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Leak Testing Fixtures Manufacturer

Leak Testing Fixtures from HEMSUN, India — tooling and turnkey support for PTFE and powder lines. Worldwide project support; send drawings for review.

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Profile Checking Fixtures Manufacturer

Profile Checking Fixtures from HEMSUN, India — tooling and turnkey support for PTFE and powder lines. Worldwide project support; send drawings for review.

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CMM Fixtures Manufacturer

CMM Fixtures from HEMSUN, India — tooling and turnkey support for PTFE and powder lines. Worldwide project support; send drawings for review.

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End-of-Line Fixtures Manufacturer

End-of-Line Fixtures from HEMSUN, India — tooling and turnkey support for PTFE and powder lines. Worldwide project support; send drawings for review.

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Sizing and capacity calculations

Inspection Fixtures delivers rigid, repeatable part location and distortion-free clamping under high-speed milling, turning, and multi-axis machining operations. Fabricated from vacuum-hardened alloy steels (20MnCr5, EN-24, P20), normalized subplates, and modular DIN 650 T-slot grids, every fixture is engineered to eliminate part deflection, minimize cycle vibration, and ensure batch repeatability within ≤ 0.005 mm across high-volume automotive and aerospace production runs.

Technical specifications and machine parameters

Material compatibility and engineering metallurgy

• Case-Hardened 20MnCr5 / EN-31: Carburized and hardened to 58–62 HRC for locating pins, rest pads, and high-wear wear plates.
• Pre-Hardened P20 Alloy Steel: Machined baseplates and tombstone bodies with uniform 28–32 HRC core hardness and zero residual stress.
• High-Tensile EN-24 / EN-19 Steel: Heavy-duty clamp arms, connecting links, and pivot pins for high-torque workholding assemblies.
• Hard Anodized Aluminum 7075-T6: Lightweight fixture plates and modular jaws for high-speed robotic tool changers and CMM setups.
• Phosphor Bronze / Brass Wear Pads: Non-marring contact pads for finished machined faces and delicate thin-walled components.

Procurement and tooling selection guide

Key technical considerations for precision workholding:

1. Locating Kinematics: Verify 3-2-1 primary, secondary, and tertiary datum pins are diamond/round ground EN-31.
2. Actuation Type: Select manual cam/toggle clamps for low-volume jobs, or hydraulic/pneumatic swing cylinders for automated CNC production.
3. Chip Clearance & Coolant Flow: Ensure steep relief angles and chip evacuation slots prevent swarf buildup on locating faces.
4. Modularity & Zero-Point Compatibility: Incorporate standardized pull studs and grid plates for rapid 2-minute changeovers.

Testing, inspection and global commissioning

HEMSUN ENGG. INDUSTRIES inspects all fixtures on coordinate measuring machines (CMM) before dispatch, verifying datum parallelism, perpendicularity, and positional tolerances. Trial part machining and clamping pressure holding tests are conducted prior to delivery.