R. Sagar, IIT Delhi, Delhi, India
There are many commercial processes available for making a polymeric composite. These can be broadly divided into two categories primary and secondary manufacturing methods . The primary manufacturing methods include Hand Lay-up and Spray-up techniques, Resin Transfer Molding, Compression Moldings, Autoclave Molding, Injection Molding, Filament Winding, Pultrusion etc., while the secondary manufacturing methods include edge trimming, hole generation or drilling, grooves cutting,
a new composite drill bit design. composite is a filament wound hybrid carbon/Kevlar fiber layer. central areas are gradually built up to the required outer diameter using Kevlar cloth which allows for wear. resin system determines the maximum operating temperature for the drill and its corrosion resistance. various micro-drilling methods for deep hole drilling. The performance of the developed drill is evaluated by studying effect of various tool performance parameters
Advantages:
Light weight High strength to weight ratio Simple handling Limitations
Cost Outer layer erosion. The composite is fabricated with the help of hand lay up. The major constituents are Al powder, SiC powder and epoxy binder. The composite so formed is heated with the help of heaters embeded in the die. The standard specimens are prepared and their micro and macro properties are checked. Instron Testing machine was used for tensile and compressive strength. Hardness and density were also measured. Porosity is a major issue,it can be reduced by using pressure during fabrirication stage. Cutting tools were manufactured for parting off and drilling.
