Work-holding and automation

The Work-holding and Automation Group is focusing on fixture static, fixture dynamics, vibration control, noise control, distortion control, residual stress release, flexible hinge, hydraulics, pneumatics, precision engineering & related product development.

Workholding

Research

Our group is focused on:

Fixture statics location theory, method, and accuracy; clamping force, clamping strength, and clamping distortion.

Fixture dynamics – dynamics related geometrical characteristics, beam vibration, shell vibration, disk vibration, and bell-like vibration.

Vibration control stiffening techniques (modal shape control), and damping techniques (dynamic stiffness control).

Noise control – control the ultra-thin-wall component produced noise, make the machining quiet.

Distortion control and Residual stress release – distortion prediction and control, use the floating and lockable clamp technique to minimise the residual stress release produced distortion, including twist, bending in disk, blisk, ring, cover plate, blade, vane, and shaft.

Flexible hinge – flexible hinge related devices, such as mandrels and chucks.

Hydraulics in work-holding hydraulic system design and development in manufacturing.

Pneumatics in work-holding pneumatic system design and development in manufacturing.

Large component design and optimisation optimisation of geometrical configuration and static-dynamic performance.

Precision engineering related structure optimisation – precision long probe design and optimisation.


Services

Statics

Ansys

  • Strain-stress analysis, large displacement analysis

Abqus

  • Strain-stress analysis, contact analysis and nonlinearity problem

Dynamics

Ansys

  • Modal analysis, buckling analysis, time response analysis

Abqus

  • Modal analysis, buckling analysis, time response analysis

Thermal dynamics

Ansys

  • Thermal response analysis, thermal distortion analysis

Explicit dynamics

Ls-dyna

  • Damage analysis, drop analysis, and crash analysis

Fluid dynamics

Film lubrication:

  • Aerostatic bearing, aerodynamic bearing, hydrostatic bearing, hydrodynamic bearing

Multi-phases flow:

  • Jet kinetics (nozzle jet) and abrasive water jet (three phases flow)

Thermal-fluid:

  • Clutch analysis

Fixture design

  • Fixtures for disk, blisk, blade, fan blade, cover plate, shaft, stub, ring, and strut ring.


Products

CNC tombstones:

  • CNC tomb stones will make CNC machine tool more flexible, various CNC tombstones are available, including one-sider, two-sider, three-sider, four-sider, angled tombstone, and multi-purpose tombstone.

Tombstones

Precision long probe:

  • Precision long probe is developed for deep holes workshop on-machine inspection, standard length series is 1,200 mm, 1,600 mm, 2,000 mm, and 2,400mm. Repeatability is 1 μm.

Precision long probe

Floating and lockable clamp (partner only):

  • Floating and lockable clamp is developed for distortion control and residual stress release in machining, particularly for a thin wall component, such as blade, vane, leading edge, and disk.

Smart clamp (partner only):

  • Smart clamp is developed for general purpose of distortion control and residual stress release in machining, particularly for disk.

Smart chuck (partner only):

  • Smart clamp is developed for general purpose of distortion control and residual stress release in machining, particularly for ultra- thin wall disk.

Smart steady (partner only):

  • Smart steady is developed for distortion control and residual stress release in shaft machining, particularly for ultra-long shaft.

Precision water jet head (partner only):

  • Precision water jet head is developed for precision water jet system, which links coordinates systems of machine tool, user’s system, and inspection system. Repeatability is 25 μm.

Precision water jet table (partner only):

  • Precision water jet table is developed for precision water jet system, which links coordinates systems of user’s system, and inspection datum. Repeatability is 25 μm.

Contact

Dr. Shaoming Yao

s.yao@sheffield.ac.uk