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Injection Mold Design Engineering von Kazmer, David O. (eBook)

  • Verlag: Carl Hanser Fachbuchverlag
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Injection Mold Design Engineering

This book provides a structured methodology and scientific basis for engineering injection molds. The topics are presented in a top-down manner, beginning with introductory definitions and the big picture before proceeding to layout and detailed design of molds. The book provides very pragmatic analysis with worked examples that can be readily adapted to real-world product design applications. It will help students and practitioners to understand the inner workings of injection molds and encourage them to think outside the box in developing innovative and highly functional mold designs. This new edition has been extensively revised with new content that includes more than 80 new and revised figures and tables, coverage of development strategy, 3D printing, in-mold sensors, and practical worksheets, as well as a completely new chapter on the mold commissioning process, part approval, and mold maintenance. David O. Kazmer (Ph.D. Mechanical Engineering, Stanford University) is the Dandeneau Professor for Sustainable Manufacturing in the Department of Plastics Engineering at the University of Massachusetts Lowell. He performs research and teaches courses related to plastics product and process development. Prior to his current appointment, he was an Applications Engineer at General Electric and Director of Research and Development at Synventive HotRunners. He is a licensed professional manufacturing engineer, and is a fellow of the American Society of Mechanical Engineers and the Society of Plastics Engineers. He is also the recipient of the ASME Kos Ishii-Toshiba Award for sustained, meritorious contributions to the field of design for manufacturing.

Produktinformationen

    Format: PDF
    Kopierschutz: watermark
    Seitenzahl: 553
    Sprache: Englisch
    ISBN: 9781569905715
    Verlag: Carl Hanser Fachbuchverlag
    Größe: 23849kBytes
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Injection Mold Design Engineering

Nomenclature
Mold engineering requires analysis, and so an extensive nomenclature has been developed. L , W , and H refer to the length, width, and height dimensions as shown in Figure 1 .


Figure 1 Length, width, and height nomenclature

Variable names have been selected and consistently used as expected (e. g., T for temperature, C for cost, P for pressure, etc.). R refers to rate-related constants (with time dependence) and refers to monetary constants (with cost dependence). To provide clarity, variable subscripts are unabbreviated throughout most of the book. The nomenclature for many of the variables and their units are as follows.

Table 1 Nomenclature

Variable

Meaning


Thermal diffusivity [m2/s]

beta

Compressibility [1/MPa]

d

Deflection [m]

d bending

Deflection due to bending [m]

d compression

Deflection due to compression [m]

d total

Deflection due to bending and compression [m]

Strain [m/m]

Plastic's strain to failure [%]

Shear rate [1/s]

Maximum allowable shear rate for a plastic melt being molded [1/s]


Viscosity [Pa s]


Thermal conductivity [W/m°C]

insert

Cost per unit volume of core and cavity insert materials [$/m3]

mold

Cost of mold metal per kilogram [$/kg]

plastic

Cost of plastic per kilogram [$/kg]


Tolerance limit [m]

mi

Apparent viscosity for Newtonian model [Pa]

mi static

Coefficient of static friction [-]


Density [kg/m3]

insert

Density of core and cavity insert materials [kg/m3]

plastic

Density of plastic [kg/m3]

phi

Draft angle [°]

th

Draft angle [°]

s buckling

Stress level at which column buckles [MPa]

s cyclic

Imposed cyclic stress [MPa]

s endurance

Maximum allowable stress given cyclic loading [MPa]

s hoop

Hoop stress [MPa]

s limit

Maximum allowable stress given cyclic loading or yielding [MPa]

i

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