Machining of Poly Methyl Methacrylate (PMMA) and Other Olymeric Materials: A Review

Machining of Poly Methyl Methacrylate (PMMA) and Other Olymeric Materials: A Review

Fredrick M. Mwema, Job Maveke Wambua
DOI: 10.4018/978-1-7998-7864-3.ch016
OnDemand:
(Individual Chapters)
Available
$37.50
No Current Special Offers
TOTAL SAVINGS: $37.50

Abstract

Polymers have been adopted industrially in the manufacture of lenses for optical applications due to their attractive properties such as high hardness, high strength, high ductility, high fracture toughness, and also their low thermal and electrical conductivities. However, they have limited machinability and are therefore classified as hard-to-machine materials. This study conducts a critical review on the machining of various polymers and polymeric materials, with particular focus on poly (methyl methacrylate) (PMMA). From the review it was concluded that various machining parameters affect the output qualities of polymers and which include the spindle speed, the feed rate, vibrations, the depth of cut, and the machining environment. These parameters tend to affect the surface roughness, the cutting forces, delamination, cutting temperatures, tool wear, precision, vibrations, material removal rate, and the mechanical properties such as hardness, among others. A multi-objective optimization of these machining parameters is therefore required, especially in the machining of PMMA.
Chapter Preview
Top

Background: Theory Of Machining

Machining involves material removal in the form of chips, and which is achieved by shear deformation on the workpiece under machining. This process is characterized by the inter-relation of five machining elements, that is, the machining tool, tool holder and guiding element, the material holder, the workpiece and the machine. The cutting tools are categorized as either single or multi-edged, and may either perform the machining process in a linear or rotary direction, and these tools are designed depending on the cutting operation intended (Nee, Dufraine, Evans & Hill, 2010). The sharp edges on the machining tools allow for the chip formation as the tool interacts with the workpiece, and acts as a major determinant of tool life, the integrity of the surface finish, the shearing force required and the temperatures generated in the process. The cutting ability of a tool is dependent on the tool geometry, which is a product of the face angle, the flank, the rake angle and the clearance angle (Nee et al., 2010).

Complete Chapter List

Search this Book:
Reset