模具外文翻译外文文献英文文献注塑模.doc

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The Injection Molding
1、The injection molding
Injection molding is principally used for the pcaping back into the screw flight.
The clamping force that a machine is capable of exerting is part of the size designation
and is measured in rule-of-thumb can be used to determine the tonnage required
1 for a particular is based on two tons of clamp force per square inch of projected
the flow pattern is difficult and the parts are thin,this may have to go to three or
four tons.
Many reciprocating-screw machines are capable of handing thermosetting plastic
these materials were handled by compression or transfer
materials cure or polymerize in the mold and are ejected hot in
the range of 375?C,410? parts must be allowed to cool in the mold
in
order or remove them without distortion. Thus thermosetting cycles can be course the mold must be heated rather than chilled,as with thermoplastics.
3、Basic Underfeed Mould
A simple mould of this type is shown in Figure3-1,and the description of the
design
and the opening sequence mould consists of three basic parts,namely:
the
moving half,the floating cavity plate and the feed plate respectively.
The moving half consists of The moving mould plate assembly,support block,backing
plate,ejector assembly and the pin ejection the moving half in this design is
identical with the moving half of basic moulds.
The floating cavity plate,which may be of the integer or insert-bolster design,is
located on substantial guide pillars(not shown)fitted in the feed guide
pillars
must be of sufficient length to support the floating cavity plate over its full movement
and still project to perform the function of alignment between the cavity and core when
the mould is being bushes are fitted into the moving mould plate and the
floating cavity