By Corrado Poli
Design for Manufacturing assists someone now not conversant in numerous production tactics in greater visualizing and realizing the connection among half layout and the convenience or hassle of manufacturing the part.
Decisions made throughout the early conceptual phases of layout have a superb influence on next stages. actually, ordinarily greater than 70% of the producing fee of a product is decided at this conceptual degree, but production isn't concerned. via this ebook, designers will achieve perception that would let them check the influence in their proposed layout on production difficulty.
The overwhelming majority of parts present in advertisement batch-manufactured items, reminiscent of home equipment, pcs and workplace automation gear are both injection molded, stamped, die forged, or (occasionally) forged. This booklet emphasizes those specific, most typically carried out processes.
In addition to chapters on those techniques, the e-book touches upon fabric technique choice, basic instructions for making a choice on even if numerous elements might be mixed right into a unmarried part or now not, communications, the actual and mechanical houses of fabrics, tolerances, and inspection and caliber control.
In constructing the DFM tools offered during this booklet, he has labored with over 30 agencies focusing on injection molding, die-casting, forging and stamping.
- Implements a philosophy which permits for less complicated and extra fiscal creation of designs
- Educates designers approximately manufacturing
- Emphasizes the 4 significant production processes
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Extra info for Design for manufacturing : a structured approach
Sample text
R I ,1. 2 Basic envelope for a part. 3 ~ L 4 Isolated projections of small volume. any depression or hole in a part, including also depressed features that come about due to closely spaced projecting walls. 4 shows some examples of recessed features. 4 are sectional views of the molds that can be used to produce these features. 4d is not considered to have a recess because the direction of mold closure does not affect basic tool construction difficulty. Holes and Depressions Depressions are pockets, recesses, or indentations of regular or irregular contour that are molded into a portion of an injection-molded part.
12 illustrate how the choice of mold closure direction and the location of the parting surface influence design and, in particular, tool design and tool cost. With knowledge of mold closure direction and the location of the parting surfacemand keeping in mind that the material should flow smoothly into and through the mold, solidify rapidly and uniformly, and then be easily ejected designers can well understand and make good use of the following DFM guidelines: In designing parts to be made by injection molding, compression molding, and transfer molding, designers must decide~as a part of their design--the direction of mold closure and the location of the parting surface.
The melting point of a material can affect energy costs for shaping parts via injection molding and casting. Thermal conductivity, which is a measure of the ease with which heat flows through a material, affects cycle time, hence, processing costs. Metals have high values of thermal conductivity, and ceramics and plastic have low thermal conductivity. Density, of course, is important when considering strength-to-weight ratios as well as stiffness-to-weight ratios and weight savings. Low values of specific heat, which is a measure of the energy required to raise the temperature of a unit mass of material by one degree, cause temperatures to rise while processing the material.