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A BRIEF STUDY ON PLASTIC INJECTION MOLDING PROCESS
ABSTRACT:
Injection molded components are consistently designed to minimize the design and manufacturing information content of the enterprise system. The resulting designs, however, are extremely complex and frequently exhibit coupling between multiple qualities attributes. Axiomatic design principles were applied to the injection molding process to add control parameters that enable the spatial and dynamic decoupling of multiple quality attributes in the molded part. There are three major benefits of the process redesign effort. First, closed loop pressure control has enabled tight coupling between the mass and momentum equations. This tight coupling allows the direct input and controllability of the melt pressure. Second, the use of multiple melt actuators provides for the decoupling of melt pressures between different locations in the mold cavity. Such decoupling can then be used to maintain functional independence of multiple qualities attributes. Third, the heat equation has been decoupled from the mass and momentum equations. This allows the mold to be filled under isothermal conditions. Once the cavities are completely full and attain the desired packing pressure, then the cooling is allowed to progress.
INTRODUCTION:
Injection molding is the most commonly used manufacturing process for the fabrication of plastic parts. A wide variety of products are manufactured using injection molding, which vary greatly in their size, complexity, and application. The injection molding process requires the use of an injection molding machine, raw plastic material, and a mold. The plastic is melted in the injection molding machine and then injected into the mold, where it cools and solidifies into the final part. The steps in this process are described in greater detail in the next section.
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Nowadays,plastic products have been widely used in a unimaginated range. So
plastic moulds and
plastic injection molding machines are also needed by a
lot of manufacturers.But do you know how to choose a plastic injection
molding machine? If not,please visit at
http://plasticmachine.blogoak?
blogname=plasticmachine&postarch=1.
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How to choose plastic injection molding machine
Typically, the important factors when choosing plastic injection molding
machine include mold, product, molding requirements and so on. Therefore,
you must collect or have the following information before making a choice:
mold dimension (width, height, thickness), weight and special design; types
and amount of the plastic (single or multiple plastic materials); dimensions
and weight of injection molding product (length, width, height, thickness);
molding requirements, such as quality condition, production speed and so on.
In obtaining the above information, you can follow these steps to choose a
suitable plastic injection molding machine:
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Short history of plastic
1862 first synthetic plastic
1866 Celluloid
1891 Rayon
1907 Bakelite
1913 Cellophane
1926 PVC
1933 Polyethylene
1938 Teflon
1939 Nylon stockings
1957 velcro
1967 “The Graduate”
Readings
Tadmore and Gogos
Molding and Casting pp584 -610
Boothroyd Dewhurst
Design for Injection Molding pp 319 - 359
Kalpakjian see Ch 18
Injection molding case study;Washing machine augers; see on web page
Process Operation
Temperature: barrel zones, tool, die zone
Pressures: injection max, hold
Times: injection, hold, tool opening
Shot size: screw travel
Part design rules
Simple shapes to reduce tooling cost
No undercuts, etc.
Draft angle to remove part
In some cases, small angles (1/4°) will do
Problem for gears
Even wall thickness
Minimum wall thickness ~ 0.025 in
Avoid sharp corners
Hide weld lines
Holes may be molded 2/3 of the way through the wall only, with final drilling to eliminate weld lines
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http://studentbank.in/report-a-brief-stu...e=threaded
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