Automotive Production Engineering; Glasses Somsak Siwadamrongpong 2/2552.

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Presentation transcript:

Automotive Production Engineering; Glasses Somsak Siwadamrongpong 2/2552

Contents Glass properties Chemical, Physical and Optical properties Glass structure Automotive glasses Tempered glasses Zoned tempered glasses Laminated Glasses Automotive glass production

Glass Properties General properties of glasses High hardness / Brittle Low density compared to high strength Low thermal expansion coefficient Low heat / electrical conductivity High melting point Good chemical resistance / Chemical inert Wide range of optical transmission Transparent Translucent Opaque

Optical transmission

Glass transition temperature; Tg By TMA: Thermal Mechanical Analysis

Glass transition temperature; Tg By DSC: Differential Scanning Calorimetry

Glass Applications

Popular Glasses Silicate glasses Soda lime silicate Aluminosilicate Borosilicate Phosposilicate Chalcogenide glasses Fluoride glasses Ceramic Glaze

Glass structure; silicate (SiO 2 ) Crystalline Amorphous

Glass structure; silicate (SiO 2 ) Tetrahedral SiO 2

: Vitreous silica (SiO 2 ) O O Si O O O O O O O O O O O O O O O O O Each Si tetrahedron links to 4 tetrahedra by sharing corner with each other All oxygen are presence as bridging oxygen (BO) Glass structure; silicate

: Binary silicate glass (6SiO 2 -2Na 2 O) O O-O- Si O O Na + O O Si O O-O- O O O O O O O O O O O O-O- Na + O-O- Network linkage is broken as entering of network modifier Non-bridging oxygen (NBO) is initiated and its charge is compensated with the metal cation Glass structure; silicate

: Ternary alumino-silicate glass (6SiO 2 -Al 2 O 3 -2Na 2 O) O-O- Al O OO O - Na + O Si O O O O O O O O O O O O O OO-O- Na + O Al O OO O - Network consists of Si and Al tetrahedra Metal cation is compensated by AlO 2 - and the excess cation will break the network and compensate with NBO Glass structure; silicate

2+ O Si Ca Al Glass structure; silicate : Ternary alumino-silicate glass (SiO 2 -Al 2 O 3 -CaO) system

Window glasses

Automotive Glasses Tempered glasses / Zoned tempered glasses Used for side and rare glasses Laminated glasses Used for front glass Other glasses UV / IR cut glass Privacy glass Water repelling glass

Tempered glasses further cooled tension compression before cooling hot surface cooling hot cooler Strength increase 3-5 times of annealed glasses

Tempered glasses Zone tempered glass Tempered glass

Laminated Glasses PVB = Polyvinyl Butyral Interlaying Film

Glass Production Raw Materials Flat Glass Tempered Glasses Laminated Glasses Sand powder (SiO 2 ), Al 2 O 3, Na 2 O, CaO, MgO Floating Technique For construction, panel automotive and others

Flat Glass Production

Floating Technique

A A Section A-A

Floating Technique

Flat Glass Production Line

Glass Tempering Processes

Washing / Drying Section Laminating / Heating Section

Tempered Glass’s Temperature Inspection

Glass Laminating Processes

Inspection, Packing

Glass Laminating Processes

Pre-Processes for Glass Laminating

Glass Laminating Processes Post-Processes for Glass Laminating

Q&AQ&A

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