Diamond Systems Tritan Guía para resolver problemas Pagina 3
- Pagina / 44
- Tabla de contenidos
- SOLUCIÓN DE PROBLEMAS
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
Contents
Eastman
™
polymers—Processing and mold design guidelines . . . . . . . 6
Part I Mold design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Design for moldability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mold filling analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Stress concentration factors . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Coring thick wall sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rib and boss design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Suggested mold temperatures . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mold shrinkage and warpage . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Suggested cooling line spacing . . . . . . . . . . . . . . . . . . . . . . . . . 9
Core cooling techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Providing turbulent coolant flow . . . . . . . . . . . . . . . . . . . . . . . . 10
Notes on cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Why corners are critical cooling areas . . . . . . . . . . . . . . . . . . . . . 12
Sprue design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Sprue cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Spiral cooling sprue insert. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
High-conductivity sprue bushing. . . . . . . . . . . . . . . . . . . . . . . . 13
Mold/sprue cooling example . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Hot sprues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Runner design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Runner cross section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Half-round runner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Gate design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Avoid gating into thin sections . . . . . . . . . . . . . . . . . . . . . . . . . 16
Tunnel gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Fan gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Edge gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Gating parts with maximum dimensions of 50 mm (2 in.) or less . . . . . 17
Hot runner systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Design guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
- polymers 1
- Contents 3
- Stress concentration factors 7
- Coring thick wall sections 7
- Rib and boss design 7
- Cooling 8
- Mold shrinkage and warpage 9
- Core cooling techniques 9
- Notes on cooling 11
- Sprue design 12
- Sprue location 13
- Sprue bushing 13
- Double-lead 13
- Runner design 14
- Gate design 15
- • Tab must be cut away 17
- 1.3–1.5 mm (0.050–0.060 in.) 17
- Hot runner systems 18
- Valve gates 19
- Figure 27 Valve gate 19
- Venting and ejection 20
- Alloys for mold construction 21
- Family molds 22
- Mold polishing and texturing 22
- Draft angle guidelines 22
- Using zero draft 23
- Poly-Ond 23
- coating 23
- Tungsten disulfide coatings 23
- Part II Processing 24
- Clamping force 25
- Injection speed 25
- Screw and barrel design 25
- Periodic inspection 26
- Equipment 26
- Figure 30 Injection nozzle 26
- Conditions 27
- Moisture measurement 29
- Dryer troubleshooting 29
- Dryer troubleshooting guide 30
- Injection molding 31
- Start-up 32
- Production molding 33
- Packaging and part handling 33
- Part III 34
- Secondary operations 34
- Ultrasonic welding 35
- Ultrasonic staking 36
- Heat staking 36
- Part IV Troubleshooting 37
- Molded-in stress 40
- PRETRIAL PREPARATION 41
- MOLDING CONDITIONS RECORD 42
- Eastman Chemical Company 44
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