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SIMAF PRESENTATIONSIMAF PRESENTATION
SCREWSFor
PlasticsMetalsAlloys
SIMAF PRESENTATIONSIMAF PRESENTATION
SIMAF SCREWSSIMAF SCREWS
SIMAF SCREWSSIMAF SCREWSPOLYPLASTPOLYPLAST
SCREWS FOR PLASTICSSCREWS FOR PLASTICSPOLYPLASTPOLYPLAST
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SCREWS FOR PLASTICSSCREWS FOR PLASTICS
POLYPLASTPOLYPLAST32
MATERIALS : - STANDARD : ZINC-PLATED STEEL,WHITE.
- ON REQUEST : INOX A2.
ZINC-PLATED YELLOW CHROMATED STEEL.
DACROMET® , PHOSPHATIZATION, JS 500 .
VERSIONS :FLAT OR SHARP END.
POLYPLASTPOLYPLASTGENERAL FACTSGENERAL FACTS
Why 60° thread of tapping screws does not fit for plastics Why 60° thread of tapping screws does not fit for plastics assembly.assembly.
• Stud formation by deformationStud formation by deformation
high radial tension.high radial tension.
• Weak penetration of thread in the materialWeak penetration of thread in the material
small holding to wrenching.small holding to wrenching.
• Bad quality of formed nutBad quality of formed nut
high possibility to fail the assembly.high possibility to fail the assembly.
• Small area of contact between the screw and Small area of contact between the screw and the materialthe material
low holding to unscrewing by vibration.low holding to unscrewing by vibration.
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Geometry of the screws thread had toGeometry of the screws thread had to
adapt to demands of new materials, to adapt to demands of new materials, to
improve tapping-screws performance.improve tapping-screws performance.
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POLYPLASTPOLYPLASTGENERAL FACTSGENERAL FACTS
POLYPLASTPOLYPLASTUSEUSE
• Assembly in only one Assembly in only one operation (suppression operation (suppression of tapping). of tapping). Elimination of tapping Elimination of tapping chips.chips.
• Elimination of costs of Elimination of costs of cleaning blind holes.cleaning blind holes.
• Suppression of pollution Suppression of pollution
risksrisks..
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POLYPLASTPOLYPLASTTHREADTHREAD
• Elimination of possibility to damage the Elimination of possibility to damage the threads of the nut by a bad alignment at threads of the nut by a bad alignment at the beginning of screwing. the beginning of screwing.
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• symmetrical thread of 40°symmetrical thread of 40°
instead of 60°.instead of 60°.
• Application :Application :
Multiple possibilities of use.Multiple possibilities of use.
Cylindrical formCylindrical form
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POLYPLAST SCREWS
POLYPLASTPOLYPLASTTHREADTHREAD
• Easier penetration in the material.Easier penetration in the material.
• Better area of contact with the plastic.Better area of contact with the plastic.
• Virtual nut better formed.Virtual nut better formed.
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Pitch = p
POLYPLASTPOLYPLASTTHREADTHREAD
• Plastic is less displaced.Plastic is less displaced.
• The nut created in the plastic is more The nut created in the plastic is more resistant.resistant.
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Volume of displaced plastic
Thread for plate Polyplast thread
POLYPLASTPOLYPLASTTHREADTHREAD
• Asymmetrical threadAsymmetrical thread 12,5° 12,5° on the load flank.on the load flank.
• Application : Application :
high performing screw for high performing screw for plastics. plastics.
CylindricalfCylindricalformorm
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SCREWS FOR PLASTICS SCREWS FOR PLASTICS POLYFORMPOLYFORM
POLYFORM SCREWS
High holding to wrenchingHigh holding to wrenching
•Asymetrical threadAsymetrical thread..•Loading flank with a 12.5° angle.Loading flank with a 12.5° angle.
•Guide flank with gradual angle.Guide flank with gradual angle.
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Guiding flank
Pull-out
POLYFORMPOLYFORMTHREADTHREAD
Loading flank
Asymetrical distribution of the materialAsymetrical distribution of the material
• The radial force on the load flank (Fr1 )is inferior to the one of the The radial force on the load flank (Fr1 )is inferior to the one of the guide flank what provokes a traverse of material to the load flank.guide flank what provokes a traverse of material to the load flank.
• Concentration of the material on the load flank.Concentration of the material on the load flank.
• Better holding to wrenching.Better holding to wrenching.
• Better resistance to unscrewing.Better resistance to unscrewing.
PLASTICPLASTIC
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Pull-out
Rotation of plastic
POLYFORMPOLYFORMTHREADTHREAD
POLYFORMPOLYFORMSCREWINGSCREWING
• Low screwing torque.Low screwing torque.
• High ruin torqueHigh ruin torque
= High security during screwing.= High security during screwing.
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Mechanical properties of assembly
POLYFORMPOLYFORMPULL-OUT RESISTANCEPULL-OUT RESISTANCE
Mechanical properties of assemblyMechanical properties of assembly
POLYFORM diameter 4 mmPOLYFORM diameter 4 mm
GREAT HOLDING TO WRENCHING INGREAT HOLDING TO WRENCHING IN
THERMOPLASTICS AND HARD PLASTICSTHERMOPLASTICS AND HARD PLASTICS
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TRILOBULAR SCREWS TRILOBULAR SCREWS POLYPLASTPOLYPLAST
What is a trilobular screw ?What is a trilobular screw ?
• The trilobular form permitsThe trilobular form permitsconcentrating the effort of concentrating the effort of tapping on three points and tapping on three points and reducing the friction during reducing the friction during screwing.screwing.
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D = diameter of the screw C = circumscribed diameter of the screw
K = measure of lobularity
TRILOBULAR POLYPLASTTRILOBULAR POLYPLASTHIGH TORQUE RESISTANCEHIGH TORQUE RESISTANCE
Screw with loching coatingScrew with loching coating Screws with washers Grower or Screws with washers Grower or notchednotched
• Elimination of washers Grower or notched.Elimination of washers Grower or notched.
• Elimination of thread-lockers (coating or others).Elimination of thread-lockers (coating or others).
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TRILOBULAR POLYPLASTTRILOBULAR POLYPLASTTORQUE AND PULL-OUT RESISTANCETORQUE AND PULL-OUT RESISTANCE
• With plastic With plastic memory, the memory, the material fills the material fills the space between the space between the lobes.lobes.
• Resistance to unscrewing (self-locking).Resistance to unscrewing (self-locking).
• Resistance to wrenching.Resistance to wrenching.
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D=diameter of the screw C=circumscribed diameter of the screw
K=measure of lobularity
TRILOBULAR POLYPLASTTRILOBULAR POLYPLAST
Trilobular screw for plastics Trilobular screw for plastics
• Symmetrical thread 45°Symmetrical thread 45°
• Application :Good performances in Application :Good performances in thermoplastics.thermoplastics.
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METRIC TRILOBULAR SCREWSMETRIC TRILOBULAR SCREWSTRILOCKTRILOCK
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Trilobular form of the thread guaranties a perfect unionbetween the screw and the
created nut.
The point with double-anglepermits an easy installation of thescrew and ensures a formation of
thread with a low tightening torque.
• Small torque of tapping High torque of ruinSmall torque of tapping High torque of ruin
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TRILOKTRILOK
TRILOKTRILOK
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loose
Oversizedthread
TRILOKTRILOK
Holes bordered with steelHoles bordered with steel
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TRILOKTRILOK
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Holes moulded in alloysHoles moulded in alloys
ANGLE1°-11 ’
TRILOKTRILOK
Drilled holesDrilled holes
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TRILOBULAR SELF-TAPPING TRILOBULAR SELF-TAPPING SCREWS FOR THIN PLATES SCREWS FOR THIN PLATES
ROLOKROLOK
- Special thread permits doing high performance fastenings on thin plates (steel and aluminium).
-High resistance to tightening torque.
- Form of the screw end provokes an extrusion of the plate that forms an elongation ahd arenforcement of the threaded part of the plate.
-Resists to unscrewing by vibration thanks to trilobular form.
- Reduction of costs : use of nuts and notched washers is avoided.
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d mm M3 M4 M5
D mm 6 8 10
K mm 2,4 3,1 3,8
Z1 Z2 Z2
6
7
L (
mm
)
8
ROLOKROLOKDIMENSIONS AND CHOICEDIMENSIONS AND CHOICE
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The screws form a nut into thin sheets either in steel or aluminium.
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ROLOKROLOKDIMENSIONS AND CHOICEDIMENSIONS AND CHOICE
RECAP BOARDRECAP BOARD32 & 33
FORM MATERIALSUPPORT
ADVANTAGES
POLYPLAST Cylindrical Plastics andThermo plastics
Comparing to plate screws(60°), this screw proposes
a thread at 40°.
POLYFORM Cylindrical Hard plastics andThermo plastics
Asymmetrical threadHigh resistance
To wrenchDeeper assemblies
TRI LOBULARPOLYPLAST Trilobular
Plastics andSome resins plastics
Tapping by gradualdeformation.
Resistance to unscrewing.
TRI LOK Trilobular Metals andAlloys
Tapping by gradual deformation.
ROLOK MetricTrilobular
Metals andAlloys
High performancein thin metal sheets.
APPLICATIONS
PLASTIC SCREWSPLASTIC SCREWS
APPLICATIONAPPLICATION
Customer : Customer : DCM PRECISION
• Field of activity Field of activity : : Cutting-off, shaping, tool-making..
• Manufacturing Manufacturing : : Scale model of thermic car..
• Simaf item Simaf item : : 32 / TC 3X8PZD.
• Quantity of inserts per product :Quantity of inserts per product : 4. .
• Annual quantity : Annual quantity : 50,000 pcs.
• Application : Application : Fastening of coachbuilding on the chassis. Fastening of the suspension.
32/TC3X8PZD
APPLICATIONAPPLICATION
Customer : Customer : GE-INTERLOGIX
• Field of activity Field of activity : : Anti-intrusion alarms..
• Manufacturing Manufacturing : : Alarms for individual houses and industries.
• Simaf item Simaf item : : SERPLAST-POLYPLAST-Screws for metals with washers..
• Application : Application : Detector of intrusion by windows.
Special SERPLAST 40/THC025H050, head diameter 6mm, 6 inserts per product, 500,000 pcs a year.
POLYPLAST 32/TF2.5X8PZD, two screws per product, 1 million pcs a year.
Scerws for metals witn washers, 39/TCM2.5X65PZDF, 4 screws per product, 1.5 million pcs a year.
39/TCM2.5X65PZDF
40/THC025H050
32/TF3X6PZD
APPLICATIONAPPLICATION
Customer : Customer : GIRPI
• Field of activity Field of activity : : Plastic industry.
• Manufacturing Manufacturing : : Manufacturer of rubber and plastic tubes and pipes.
• Simaf item Simaf item : : 32/TCF5X12PZD.
• Quantity of inserts per product : Quantity of inserts per product : 1.
• Annual quantity : Annual quantity : 1 million pcs.
• Application : Application : Fastening of the two parts of the plastic hinge.
32/TCF5X12PZD
APPLICATIONAPPLICATION
Customer : Customer : LEXMARK
• Field of activity Field of activity : : Printers.
• Manufacturing Manufacturing : : Cartridges for printers.
• Simaf item Simaf item : : POLYPLAST 32/LEX/TC3X10PPZD.
• Quantity of inserts per product : Quantity of inserts per product : 12.
• Annual quantity : Annual quantity : 6 million pcs.
• Application : Application : This trilobular screw for plastic is zinc-plated black and is used to fasten cartridges for LEXMARK printers.
32/LEX/TC3X10PPZD
