insert molding
DESCRIPTION
Insert Molding. Presented by: Joshua Bush Michael Goetz Michel McCluskey. Introduction. Inserts Provide: Anchorage / Reinforcement Bearing Surfaces / Shafts Internal / External Threaded Sections Thermal or Electrical Conductivity Positioning Nameplates / Lettering Hinging. - PowerPoint PPT PresentationTRANSCRIPT
Insert Molding
Presented by: Joshua Bush Michael Goetz Michel McCluskey
Introduction
Inserts Provide: Anchorage / Reinforcement Bearing Surfaces / Shafts Internal / External Threaded Sections Thermal or Electrical Conductivity Positioning Nameplates / Lettering Hinging
Background and Theory
An insert is an integral part of a plastic molding consisting of metal or other material which may be molded into position or may be pressed into the part after it is molded
Basic Operation
Types of InsertsTwo general types:
Molded-In insertsPost Molded inserts
Basic Operation (cont.)
Molded-In Inserts Typically for internal threads / studs Metal Inserts Usually Undercut or knurled so they stay in
the part
Basic Operation (cont.)
Post Molded Inserts Uses Molded-in Hole Press Fit / Ultrasonically Fit / Self- Tapping Used for Internal Threads usually
Basic Operation (cont.)
Other Types of Inserts Blind-Hole Inserts Through-Hole Threaded Inserts Protruding Thread Inserts Shoulder-Type Inserts
Basic Operation (cont.)
Other Types of Inserts (cont.) Pressed-in Inserts Expansion Inserts Self-Tapping Screws Flat-type
Equipment Injection molding machine Hand/Pneumatic press (for post molded
inserts)Specialized Molds
Pockets to place the insert Magnetic Insert Holders
Robots / other mechanical ways of putting inserts into molds.
Advantages
Provide metal threading in a plastic partProvide for bearing surfaces Good for anchoring parts in an
assemblyElectrical Contacts in a plastic part
Disadvantages
FloatingCrushingFlow of Material Into an Open Hole
Through The InsertsFlow of Material Into Blind-hole InsertsProtruding Inserts
Plastic Part Design Standards
Dimensions/Tolerances: Thread dimensions critical. Exterior Dimensions/Knurling not as Critical. Tolerances:
Length +/- 0.010 in. Diameters +/- 0.002 in. Angular +/- 1 degree max.
Minimum Wall Thickness Around Inserts
Dependant Upon Shrinkage of Plastic Coefficient of Expansion (plastic and inserts) Temperature Range of Inserts Moisture Sensitivity of Plastic Resin Design of Insert
Minimum Wall Thickness Around Inserts (cont.)
Try To Keep Wall Thickness Around Inserts Nominal
Put Inserts in Bosses or Gussets
Mold Design Suggestions
Ejectors on the InsertsPost Inside the Mold to Hold InsertsMagnetic Insert Holders
Selection of Metal For Inserts
Refer to Data Sheets from Material Supplier
Essential Due To Coefficient of Expansion
Must Be The Same
Materials Used For Inserts
AluminumBrassCopperCarbon SteelAlloy SteelStainless SteelSilver and Other Precious Metals
Insert Illustrations
Conclusions
Through the use of inserts, a plastic part can be used in applications where once only metal could be used. Good thread, pin, and bushing properties can now be obtained in plastic parts through the use of inserts.
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