REMFORM II The optimum fastener thread geometry for your plastic applications

Transcription

1 REMFORM II The opimum fasener hread geomery for your plasic applicaions

2 REMFORM II : The ideal screw connecion ino plasic The opimum geomery for perfec assembly resuls Innovaive hread geomery A hread profile offering opimum assembly securiy concave guide flank convex load flank rounded hread cres Neiher nus nor insers are required for direc fixing wih REMFORM II faseners, because REMFORM II form heir own hreads. The screw is simply driven ino he cored hole of he moulded plasic par. REMFORM II faseners offer he following crucial advanages: The narrow, asymmerical hread profile, suppored by he rounded hread cres and he rounded flanks, enable opimum and smooh maerial displacemen during hread forming. This clever design means ha he plasic flows primarily owards he load flank; while radial ension is minimised by he rounded ips. 60 -hread 30 REMFORM II V2 10 Asymmerical hread profile Special, rounded flank profile Rounded hread cres Generaes a zero-play hread seaing Consequenly less plasic maerial has o be displaced (V1>V2) o achieve he same profile deph. This resuls in: Reduced inserion orque for he same or greaer failing orque Increased assembly securiy Fax F Frad V2 Fax F Frad M Saving space and maerials alike Influence of he load flank angle on axial and radial loads The REMFORM II offers excellen resuls, even in hin wall, shallow inserion deph siuaions. Tha means plasic componens can be designed wih considerably shorer sho imes, making for componen cos savings. Freedom from insers and ready release of he REMFORM II faseners make for he ideal soluion wih an eye o laer recycling. The low load flank angle of jus 10 reduces he radial componen (Fradial) and, ogeher wih he large hread supporing area, offers a powerful grip. Cracking of he plasic is minimised by he low radial deformaion. Meanwhile he opimised hread load suppor couners he sress relaxaion, reducing he risk of sponaneous loosening. Repeaed assembly is always an opion The seeper guiding flank finds he previously formed hread in he plasic readily on reinserion. F axial / radial α opimum Faxial Fradial Influence of load flank angle on axial and radial loads Load flank angle a Economic fasening Applicaions for he REMFORM II Plasic componen Purchase insers Assembling insers Shorer sho cycles Simplified recycling Assembly Fasener Your profi Considerable savings are available hrough he use of REMFORM II faseners over convenional screws and hreaded insers. Cos savings accrue from: Eliminaion of purchasing, logisics and assembly coss associaed wih insers Reducing he plasic maerial weigh Space-saving design poenial Reduced injecion moulding cycle imes Lower recycling coss REMFORM II faseners mee all he requiremens for faul free auomaed assembly. We offer he opimised REMFORM II hread profile in hree differen fasener designs suiable for he applicaions shown in he able opposie. very suiable suiable REMFORM II REMFORM II "HS" Thermoplasics Reinforced hermoplasics Highly reinforced hermoplasics Magnesium die-cas Zinc die-cas REMFORM II "F" Aluminium die-cas

3 REMFORM II Design guidelines REMFORM II "HS" (High Srengh) For reinforced and crack-suscepible plasics Key feaures Key feaures The relaively large hread pich, providing sufficien space for secure anchorage in he plasic maerial, coupled wih he oher hread profile advanages discussed above, makes REMFORM II faseners ideal for all convenional and reinforced plasics. In comparison o he sandard REMFORM II he "HS" version has a larger hread core, a high ensile srengh of more han 1'000 N/mm² (class 10.9) and a reduced hread pich, making i ideal for use wih hard glass or glass fibre reinforced plasics. The advanages a a glance: Asymmerical hread profile Special, rounded flank profile Rounded hread cres Generaes a zero-play hread seaing Even wih low inserion dephs REMFORM II "HS" offers advanages, because of he shallow pich. Differences from REMFORM II : Increased hread core diameer Higher ensile srengh of over 1'000 N/mm² Reduced pich "HS"-varian available from 2 mm Tube design guidelines Tube design guidelines Calculaing core diameer : Facor x nominal hread diameer d Calculaing core diameer : Facor x nominal hread diameer d Maerial Facor PP 0.75 PE d 2 d d 1 max. Maerial Facor PC* 0.84 PA 6 30% GF d 2 d d 1 max. PA 6 / PA PPE* 0.86 ABS 0.75 POM 0.75 PS d PC 30% GF* 0.87 PBT 30% GF 0.87 PET 30% GF d ASA / SAN 0.78 PPS 40% GF 0.88 PBT 0.78 PET 0.78 ABS / PC 0.80 PMMA 0.82 PC* 0.82 PA 6 30% GF 0.83 PPE* 0.84 PC 30% GF 0.85 PBT 30% GF 0.85 PET 30% GF 0.85 These recommendaions are valid for REMFORM II faseners. They are based on our laboraory ess and field experience. Wih he mulipliciy of plasics now in use, wih heir numerous mechanical properies all dependen on ime, emperaure and load, i is advisable o carry ou individual ess. The recommended values should be viewed as guidelines. d nominal hread diameer core diameer inserion deph 2 nominal hread diameer d GF glass fibre * plasics suscepible o cracking PA6T/66 45% GF 0.89 Calculaion example Nominal hread diameer: d = 3 mm Maerial being used: PC 30% GF (facor 0.87) Core diameer : 3 mm 0.87 = 2.61 mm These recommendaions are valid for REMFORM II "HS" faseners. They are based on our laboraory ess and field experience. Wih he mulipliciy of plasics now in use, wih heir numerous mechanical properies all dependen on ime, emperaure and load, i is advisable o carry ou individual ess. The recommended values should be viewed as guidelines. d nominal hread diameer core diameer inserion deph 2 nominal hread diameer GF glass fibre * plasics suscepible o cracking

4 REMFORM II "F" (Fine hread) The ideal faseners for maerials wih low duciliy Influence of ube design Key feaures Influence of core diameer The REMFORM II "F" has a furher increased core diameer and a reduced hread pich in comparison o he "HS" version. Thanks o he high ensile srengh of over 1'000 N/mm² and he hread forming area exending over wo urns, hese faseners are opimised for maerials wih low duciliy. They are also waxed for use wih meals. Inserion and failing orque in relaion o core diameer. The opimum core diameer is beween approximaely 80 and 90% hread flank coverage. This generaes he maximum separaion beween inserion and failing orque TF values. 100% hread flank coverage opimum TF Economical inserion ino: Ligh meals (Magnesium and Aluminium) Thermoseing plasics Highly reinforced hermoplasics Applicaions in plasic wih low inserion dephs Core diameer [mm] Tube design guidelines Nominal- d Pich P d2 Inseriondeph d3 0,3 0,5 d nominal- d +0.2 d3 d3 ~1,5 d Influence of inserion deph Inserion and failing orque in relaion o inserion deph. The opimum inserion deph lies a approximaely 2 he nominal hread diameer d, providing shor assembly imes and high ear-ou values. Screw breaking orque opimum Breaking of he screws TF d2 2 d Inserion deph [mm] These recommendaions are valid for REMFORM II "F" faseners. They are based on our laboraory ess and field experience. Wih he mulipliciy of alloys now in use, wih heir numerous mechanical properies, i is advisable o carry ou individual ess. The recommended values should be viewed as guidelines. Influence of he relief bore Separaing he seaing sress from radial ension. A relief bore grealy reduces cracking, paricularly in hin walled ubes, and should be used whenever possible. The screw is also guided during inserion, supporing perpendicular enry. wihou wih d nominal hread diameer op core diameer d2 boom core diameer d3 bore diameer inserion deph All dimensions in mm

5 Assembly parameers Opions Applicaion ess Precision in he smalles of spaces In order o guaranee safe inserion values and faul-free assembly operaions, we can carry ou ess on your specific applicaion. You can profi from he know-how of our experienced applicaion echnicians and he sae-of-he-ar equipmen in our labs. SFS inec also offers REMFORM II as miniaure screws. Saring from nominal diameers of jus 0.5 mm o mee your special requiremens. You will, of course, receive a deailed repor on all our ess. Assembly recommendaions Beneficial surface coaings Recommended ighening orque: TT = 0,5 0,7 TFmin TFmin TT max The mos imporan values o be deermined are: Maximum inserion orque max Minimum failing orque TFmin Opimum ighening orque TT based on he relaionship TFmin / max Failing orque TF in repea inserion Loosening orque Tear-ou force The ighening orque should be as low as possible, as high pre-ensioning forces can lead o relaxaion and cracking issues. Where desired, REMFORM II faseners can be offered wih coaings. Among hese are: spedseal Seals he applicaion Elecrical insulaion Eliminaes conac corrosion spedcaps Sops screws loosening Offers long-erm fasener securiy Angle of roaion = inserion orque TT = ighening orque TF = failing orque Influence of screwdriver speed 100 %-aribue conrol n opimum TF The inserion and failing orque values vary wih inserion speed. The opimum speed for direc inserion ino plasics has been found o be approximaely 500 min -1 o 700 min -1. Higher speeds can lead o meling issues. Increase reliabiliy a reduced coss Depending on he paricular applicaion, he already excellen qualiy level of SFS inec faseners can be honed o 0 o 3 ppm levels for defined parameers. Our soring processes offer you he following savings poenial: Reducion of down ime and roubleshooing coss on expensive auomaed lines Increased funcional efficiency of he finished produc Increased produciviy on your manufacuring lines '000 1'500 Driver speed n [min -1 ]

6 Sandard designs available Special designs Sandard head geomeries Raised cheese head Dome head Counersunk head Please reques he separae daa shees for dimensions of sandard head forms. The sandard drives offered are he TORX, TORX PLUS, cross head o DIN EN ISO 4757-Z or camera cross sandard o JCIS Specials The design of he REMFORM II fasener can, of course, be mached o your specific requiremens. In his way SFS inec offers you he poenial o inegrae furher funcions ino he fasener: Pressed-on washers o reduce he surface pressure (relaxaion) Serraed head, ring groove Double hread faseners Shoulder screws Individual power drives, combined power drives and securiy drives are also available. Surface reamens SFS inec offers a wide range of surface reamens; among hese are: Zinc and Zinc alloys (Zinc-Nickel, Zinc-Iron) wih Thin film passivaion Thick film passivaion spedacor sealing Black passivaion and sealing Zinc flake sysems Special surface finishes Individual cosmeic finishes in a range of colour opions, using he bes mach colouring process: Powder coaing Spray processes PVD-process Dip spin coaing Faseners in Aluminium can be anodised in various colours. Maerials The REMFORM II is offered as sandard in carbon seel wih a ensile srengh in excess of 900 N/mm² (corresponding o 9.8 class). REMFORM II "HS" (High Srengh) and REMFORM II "F" (Fine hread) faseners are manufacured by defaul wih a ensile srengh of over 1'000 N/mm² (corresponding o 10.9 class). Special maerials SFS inec also offers he REMFORM II fasener family in special maerials such as: Sainless seels (A2/A4) Aluminium alloys Non-ferrous meals Tianium Oher maerials available on enquiry

7 Flexibiliy and economy are our bywords a SFS inec, hroughou our inernaional nework of faciliies. We manufacure our producs in various plans across hree coninens. We mainain a coninuous knowledge exchange process beyond company boundaries and naional froniers. I is he merging and ongoing developmen of echnological knowhow which creaes he criical synergy. Tha's why we are always able o communicae and convey a sae-of-he-ar knowledge base in our echnologies. spedlack, spedacor, spedsop, spedcaps, spedseal are regisered rademarks of he SFS Group Cross locaion experise Discover our comprehensive produc porfolio TORX, TORX PLUS are regisered rademarks of Acumen Global Technologies Inc. SFS inec has over 50 years of experience in fasening echnology. We will be glad o offer you a soluion ha mees your demands. See our exensive brochures for furher informaion. You can reques hem if you need more deails. SFS inec 2015, i-a 905'440 BRO_REMFORM2_us We reserve he righ o make echnical changes Prined in Swizerland 06/2015 REMFORM II, REMFORM II "F", REMFORM II "HS" are regisered rademarks of CON Faseners AG Feel free o conac us anyime. We will be pleased o assis you. Consulancy and Sales: SFS inec Inc Porside Drive US-Medina OH Tel Fax us.auomoive@sfs.biz Turn ideas ino realiy.