Tutorial: Engineering technology Topic: Pressed and plunger connections Prepared by: Ing. Elena Nová Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Pressed and plunger connections
Plunger connection 1. Disassembling 2. Not disassembling Mostly from plastic or spring steel For assembling is used material’s elasticity One part MUST be plastic / elastic These connections can be in shape of ‘hook’ ‘with protrusions’ or ‘rounded’. Enable simple and quick connection of thin sheets, parts of nonmetal, (plastics, glass and ceramic materials )
Plunger connection system / non disassemble able Scope of using: Car assembly (coachwork) Electro technical industry Manufacturing of domestic goods / fastening of handles, cables, company’s symbols etc.
Types of plunger connectors:
Plunger connection of rounded shapes
Plunger connections using member elements Build in connection latch
Pressed connection Press pincers Cold press connection
1. Cold pressed connections Operation uses press.
2. Contacts pressing by transversal shrinkage Hot: Into heated outer part an inner cold part is inserted. Universal joint – Hot pressing-Pressing tool
3. Pressing of joints - Transverse expansion is provided by sub-cooling of inner part- shaft For cooling is used dry ice / solid CO2, up-to -79 deg. C / or liquid nitrogen up to -190 deg. C
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