FASTENERS FOR SPECIAL MATERIALS

Transcription

1 FSTENERS FOR SPEIL MTERILS Wherever you are... we have the solution!

2 FSTENERS FOR SPEIL MTERILS INTRODUTION The introduction of new materials and their successful use by designers are usually dependant on a mechanical fastening system to allow dismantling for adjustment, servicing or repair. The information in this catalogue is intended as a general guide. For further advice please consult your local PSM Sales Engineer or our pplications Engineers. The PSM Technology entre can also provide preproduction test The captive fasteners shown in this catalogue have facilities for accurate performance data. been designed to meet the needs of designers who require the strength of a steel thread when using lightweight alloys such as magnesium and resin based printed circuit boards. PREISION HRDENED INSERTS & STUDS PREISION HRDENED INSERTS & STUDS These fasteners have been designed to provide a hardened steel thread to resist tensile and torsional loading in the softer aluminium and zinc based diecastings. PRINTED IRUIT ORD FSTENERS P R I N T E D I R U I T O R D FSTENERS These fasteners have been designed to provide a metallic deep tapped thread into resin based printed circuit boards. HRDENED STEEL SREWSERTS HRDENED STEEL SREWSERTS The Screwsert range of fasteners have been designed to provide a hardened steel thread in the softer aluminium and zinc based diecastings, magnesium and thermosetting plastics. 1

3 PREISION HRDENED INSERTS & STUDS PREISION HRDENED INSERTS & STUDS have been designed to provide a hardened steel thread to resist tensile and torsional loading in the softer aluminium and zinc based diecastings. The external spiral knurl cuts into the parent material reducing radial stresses in the casting. DVNTGES DESIGNGUIDE JOINT DESIGN To achieve optimum pullout performance the joint must be designed with a stationary mating component in contact with the face of the insert. ESY SSEMLY WITH NY SQUEEZE PRESS LOW URSTING STRESS LLOWS THE USE OF THINNER WLLED OSSES STEEL THRED PROVIDES HIGH DEGREE OF REUSILITY INSTLLED INTO PLIN ORED HOLE ELIMINTES TPPING OPERTIONS HOLE PREPRTION Holes may be cored or drilled. The taper on a cored hole should be 0.~ inclusive and the hole diameter recommended should apply at the point reached bythe bottom of the insert. INSTLLTION See page. WLL THIKNESS The minimum wall thickness will vary with the ductility of the diecasting alloy, but as a general guide wall thickness should not be less than the nominal thread diameter. Specific use of materials like magnesium and applications requiring thinner boss walls may require subtle changes to the design of the insert. In either case consultation with the PSM Technology entre or local Sales Office and preproduction testing is essential. 2

4 PREISION HRDENED INSERTS & STUDS TEHNIL DT PHI & PHS INSERTS STUDS Product ode PHI STNDRD MTERILase Hardened Mild Steel STNDRD FINISHZinc & hromate Product ode PHS DIMENSIONS INTERNL THRED SIZES Recommended Length Knurl Diameter Pilot Diameter Hole Size Unified ISO Metric mm mm mm mm 1/ STUD LENGTHS Lengths vailable ( L ) MILLIMETRES INHES /1 1/ /1 / 12 7/1 1 1/2 1 / 1 / 20 7/ HOW TO SPEIFY PHI THRED SIZE PHIM PHIM PHS THRED SIZE LENGTH PHSM PHSM PHSM

5 HRDENED STEEL SREWSERTS The PSM SREWSERT range of fasteners have been designed to provide a hardened steel thread in the softer aluminium and zinc based diecastings, magnesium and thermosetting plastics. The external thread cuts into the parent material reducing radial stresses in the casting. DVNTGES STEEL THRED PROVIDES HIGH DEGREE OF REUSILITY ELIMINTES TPPING OPERTIONS HIGH PULLOUT RESISTNE INSTLLED INTO PLIN ORED HOLE HIGH MEHNIL STRENGTH ENLES USE OF REDUED DIMETER FSTENERS IDEL WHERE JKOUT IS UNVOIDLE DESIGNGUIDE HOLE PREPRTION Hole diameter will vary with the type of material used. For this reason the data table shows the hole size ranges for the different material classes. Holes may be cored or drilled. The taper on a cored hole should be 1 inclusive and the hole diameter should apply at the point reached by the bottom of the insert. 0 countersink at the top of the hole is strongly recommended 1 order to avoid the risk of chipping to the surrounding surface. The depth of the countersink should be equal to the external thread pitch of the insert. The depth of blind holes must be a minimum of 1.2 x insert length. TYPE OF LODING Direct torque loads should be avoided with this type of insert. INSTLLTION See page. WLL THIKNESS general guide to minimum wall thickness is given in the table, but this will vary according to the ductility of the die casting alloy. Special modified inserts can be supplied to cater for applications where smaller bosses are required in certain materials such as magnesium. Please contact PSM Technology entre or your local Sales Office for assistance.

6 HRDENED STEEL SREWSERTS TEHNIL DT ST INSERT P Product ode ST STNDRD MTERIL ase Hardened Mild Steel DIMENSIONL REFERENES DIMENSIONL REFERENES INTERNL THRED SIZES Unified ISO Metric mm mm mm 1/ /1 / 1/2 2.. a* Minimum Wall Thick ness High Strength >20 N/mm 2 (> H.R) MTERIL LSS Medium Strength 220 N/mm 2 (2 H.R) Low Strength <2 N/mm 2 (<2 H.R) HOW TO SPEIFY MTERIL THRED SIZE ST STSM STSM STSM

7 PRINTED IRUIT ORD FSTENERS The PSM SREWSERT range of fasteners have been designed to provide a hardened steel thread in the softer aluminium and zinc based diecastings, magnesium and thermosetting plastics. The external thread cuts into the parent material reducing radial stresses in the casting. DVNTGES DESIGNGUIDE HOLE PREPRTION Holes must be held to a tolerance of O.07mm. INSTLLTION ll Selfroaching fasteners are easy to install as no special tooling is required. However this must always be carried out using a squeeze action never a shock load. (See page ). SIMPLE PRESSIN INSTLLTION HIGH PULLOUT GURNTEED NOT TO RK RITTLE P POSITIONING THE FSTENER The recommendations given in the table must be closely followed to prevent chipping at the edge of the board.

8 PRINTED IRUIT ORD FSTENERS TEHNIL DT USH STND OFF T E E L Product ode PR STND RD MTERILMild Steel (Electrotinned) Product ode SR DIMENSIONS INTERNL THRED SIZES Unified ISO Metric mm 2 1/ mm mm T mm.0.0 E Minimum Hole Size distance from in board centre line to board edge mm mm mm STNDOFF Lengths vailable ( L ) MILLIMETRES INHES 1/ /2 /1 1/ /1 / 12 7/1 1 1/2 1 / 20 7/ 2 1 HOW TO SPEIFY PR THRED SIZE PRM PRM SR THRED SIZE LENGTH SRM SRM SRM 7

9 INSTLLTION METHODS REOMMENDED INSTLLTION SEQUENES PREISION HRDENED INSERTS & STUDS PRINTED IRUIT ORD FSTENERS 2. pply pressure to the head of the fastener sufficient to totally install the broaching The insert must be installed by a steady squeeze action f e a t u r e i n t o t h e press with tooling that will allow the insert to rotate. board, locking the are must be taken during installation to ensure that the fastener securely in insert is kept axially square, avoiding side loads that may place. damage the boss. SREWSERT INSERTS & STUDS Tapping Head Insert screwed onto installation tool Installed flush with surface Installed flush with surface The insert is installed using traditional tapping principles. Installation can be carried out using a hand tool (for Iow volumes), a tapping head attachment for a pillar drill, a standard tapping machine or fully automatic installation equipment. 1. Form a hole in the material to size recommended and install the fastener square in the hole.. I n s e r t f i x i n g screw or bolt from side opposite to the fastener head. TOTL SSEMLY SOLUTIONS PSM's philosophy is to provide a total package of fastener design, prototype production, application advice, installation systems and technical liaison for design and production engineers worldwide.