SGF. The metric thread forming connection

Transcription

1 SGF The metric thread forming connection

2 Schriever SGF Our challenge: An economical solution Alication: Direct connections in cylindrical bores and casted bores. Schriever SGF -screws are metric thread-forming, heat-treated screws. These screws are designed for alications without a female thread by forming a metric female thread in which a metric screw can be used where aroriate. In many cases the total cost of mechanical connections can be reduced significantly. Value added Advantages for the user: 1. High degree of economic efficiency by thread forming and inserting the screw in a single oeration 2. No contamination of the assembly 3. Savings in additional nuts, washers etc. 4. Less disosition eenses for required arts 5. Low installation costs 6. No disturbance of grain flow in the comonent, therefore material solidification 7. Increased loose resist by using screw connections without lay Various alications of direct connections The thread forming roerties are restricted when: 1. The difference in strength in the material of screw and comonent is too low. 2. The material grade is not suitable i. e. brittle metals (minimum elongation should be aro. 5 %) 3. Very high re-stressing forces are required. Blind hole in solid material Eamle through hole Eamle rim hole

3 Various design models of the Schriever SGF -screw Grooving ti, lobulation, lead-in threaded stud Schriever SGF -FA The Schriever SGF -FA is characterized by a large lobulation of the cross-section (un-roundness, difference in the dimensions C and E). As a result, the installation torques are very low. A-A The gri of the screw takes lace with a low aial ressing force at the start. The thread forming rocess already starts at the first turning of the screw. The length of the grooving ti is aro The secial thread geometry enables a constant low installation torque across the whole screw-in deth. C E A A ressed chamfer Schriever SGF -ZA Comared to the Schriever SGF -FA the ZA screw has a thread forming ti with a lead-in stud. This lead-in stud aids to better locate and center of the bore. A-A E The lobulation (un-roundness, difference in the dimensions C and E) is lower than the one of the Schriever SGF -FA. Consequently, a low installation torque is combined with a high aial load carrying caacity of the connection. The length of the grooving ti is here 3-4. C ressed stud A A The grooving ti of the Schriever SGF The 2 tyes of the SCHIEVE SGF -screws have differently designed grooving tis. All grooving tis feature fully formed thread flanks for a quick gri during assembly. Guidelines for the geometry of drilled or stamed and casted bores are listed. Material Schriever SGF -screws are case hardened be default according to WN We also suly steel grade 10.9 or 8.8 hardened and temered as well as stainless steel (A2 [1.4567], A4 [1.4578]). Screws are lubrication coated by default. Ordering eamle SGF of nominal diameter = 3.0 mm Length = 12 mm full thread - head = KN 8039 Healobular drive size 10 and grooving ti = chamfer KN 8039 SGF AM T10 - FA

4 DIN 7500 / WN 7500 Both SCHIEVE SGF -screw tyes are designed based on our WN 7500 which meets the requirements of DIN This alies articularly to the comliance with the guidelines on torques and forces. Production range The forming of the counter thread is created through the trilobular cross-section. To reduce the installation torque all SGF -screws are coated with lubricants. Design recommendation Technical data for cylindrical bores of Schriever SGF -screws Tye M 2 M 2,5 M 3 M 3,5 M 4 M 5 M 6 SGF -screws can be manufactured with fully threaded or artially threaded. In both versions, the secial geometry at the thread ti (chamfer or stud) aids the lacement of the screw. Screw-in deth material thickness s (mm) S Bore diameter d B (mm) S S t s s S d B S Installation torques are deendent among others on the bore diameter. Smaller diameters usually increase the loose resist but also have a higher installation torque.the bore diameter can be reduced by aro mm if materials with lower tensile strength and good deformation roerties (i.e. Al-alloys) are used. Tolerances have to be chosen according to DIN ISO 286. Technical data for rim holes of Schriever SGF -screws The torque ath in the screw-in rocess Tye M 2 M 2,5 M 3 M 3,5 M 4 M 5 M 6 Sheet thickness s (mm) h -0,5 s -0,3 s s Torque d B Destruction torque (MZ) 2 The design of the bores in rim holes is modeled on the DIN 7952 and is according to the schematic diagram. Technical data for cast bore of Schriever SGF -screws ange of safe tightening torque (MA) Contact oint of screw head (MA) Installation torque (MF) 1 Tye M 2,5 M 3 M 3,5 M 4 M 5 M 6 Dimensions in mm d du da ts ds l 1) high strength = l 2) medium strength = d a d s d o α l t s l 3) low strength = d u otation angle Eamle: for l 1 cast steel; for l 2 grey cast iron, aluminum, zinc; for l 3 magnesium, aluminum

5 KN 8031 / KN 8131 Tye KN 8031 KN 8131 KN 8031 KN 8131 KN 8031 KN 8131 KN 8031 KN 8131 KN 8031 KN 8131 KN 8031 KN 8131 KN 8031 KN 8131 Head-Ø D Head height + flange K Flange thickness s ma. adius H-cross recess t min Penetration deth t ma Z-cross recess t min Penetration deth t ma Cross-size H/Z KN 8032 / KN 8132 Tye KN 8032 KN 8132 KN 8032 KN 8132 KN 8032 KN 8132 KN 8032 KN 8132 KN 8032 KN 8132 KN 8032 KN 8132 KN 8032 KN 8132 Head-Ø D Head height K ma. Tolerance head height +/ / / / / / / adius H-cross recess t min Penetration deth t ma Z-cross recess t min Penetration deth t ma Cross-size H/Z KN 8033 / KN 8133 Tye KN 8033 KN 8133 KN 8033 KN 8133 KN 8033 KN 8133 KN 8033 KN 8133 KN 8033 KN 8133 KN 8033 KN 8133 KN 8033 KN 8133 Head-Ø D Head height K ma ma. adius H-cross recess t min Penetration deth t ma Z-cross recess t min Penetration deth t ma Cross-size H/Z

6 ma. KN 8034 / KN 8134 Tye KN 8034 KN 8134 KN 8034 KN 8134 KN 8034 KN 8134 KN 8034 KN 8134 KN 8034 KN 8134 KN 8034 KN 8134 KN 8034 KN 8134 Head-Ø D Head height K Tolerance head height adius Slot width n min n ma Slot deth t min ma. KN 8035 / KN 8135 Tye KN 8035 KN 8135 KN 8035 KN 8135 KN 8035 KN 8135 KN 8035 KN 8135 KN 8035 KN 8135 KN 8035 KN 8135 KN 8035 KN 8135 Head-Ø D Head height K Tolerance head height adius Slot width n min n ma Slot deth t min ma. KN 8036 / KN 8136 Tye KN 8036 KN 8136 KN 8036 KN 8136 KN 8036 KN 8136 KN 8036 KN 8136 KN 8036 KN 8136 KN 8036 KN 8136 KN 8036 KN 8136 Width across flats (AF size) SW Head height K

7 KN 8037 / KN 8137 Tye KN 8037 KN 8137 KN 8037 KN 8137 KN 8037 KN 8137 KN 8037 KN 8137 KN 8037 KN 8137 KN 8037 KN 8137 KN 8037 KN 8137 ma. Head-Ø D Width across flats (AF size) SW Head height K ma Flange thickness s KN 8038 / KN 8138 Tye KN 8038 KN 8138 KN 8038 KN 8138 KN 8038 KN 8138 KN 8038 KN 8138 KN 8038 KN 8138 KN 8038 KN 8138 KN 8038 KN 8138 Head-Ø D ma. Head height + flange K Flange thickness s adius Healobular drive T 10 T 10 T 15 T 15 T 20 T 20 T 25 T 25 T 30 T 30 Penetration deth t min t ma KN 8039 / KN 8139 Tye KN 8039 KN 8139 KN 8039 KN 8139 KN 8039 KN 8139 KN 8039 KN 8139 KN 8039 KN 8139 KN 8039 KN 8139 KN 8039 KN 8139 Head-Ø D Head height K Tolerance head height +/ / / / / / / ma. adius Healobular drive T 6 T 6 T 8 T 8 T 10 T 10 T 15 T 15 T 20 T 20 T 25 T 25 T 30 T 30 Penetration deth t min t ma

8 KN 8040 / KN 8140 Tye KN 8040 KN 8140 KN 8040 KN 8140 KN 8040 KN 8140 KN 8040 KN 8140 KN 8040 KN 8140 KN 8040 KN 8140 KN 8040 KN 8140 Head-Ø D Head height K ma ma. f adius Healobular drive T 6 T 6 T 8 T 8 T 10 T 10 T 15 T 15 T 20 T 20 T 25 T 25 T 30 T 30 Penetration deth t min t ma KN 8041 / KN 8141 Tye KN 8041 KN 8141 KN 8041 KN 8141 KN 8041 KN 8141 KN 8041 KN 8141 KN 8041 KN 8141 KN 8041 KN 8141 KN 8041 KN 8141 Head-Ø D Head height K ma ma. adius Healobular drive T 6 T 6 T 8 T 8 T 10 T 10 T 15 T 15 T 20 T 20 T 25 T 25 T 30 T 30 Penetration deth t min t ma Tolerances Nominal size (mm) h 13 h 14 h 15 js 14 js 15 over to / / / 0.40 ±0.125 ± / / / 0.48 ±0.15 ± / / / 0.58 ±0.18 ± / / / 0.70 ±0.215 ± / / / 0.84 ±0.26 ± / / / 1.00 ±0.31 ± / / / 1.20 ±0.37 ±0.60

9 THE S-CONNECTION 10,000 arts available in 4 weeks 4 Amazing advantages > Individually roduced for you > Starting from 10,000 arts > Available in 4 weeks > Samles can be tested free of charge Fast Fleible Schriever Order roduct samles now STS STS lus for thermolastics SLS S-tra for light metals SBS for thin sheets SGF metric self-traing srews S-tra Schriever SGF -screws are also roduced with all commercially available corrosion rotective surface finishes. Please contact us for further information. Hans Schriever GmbH & Co. KG Verbindungstechnik Hoher Hagen 5 D Lüdenscheid Phone: info@schriever-schrauben.de Internet: Technical modifications are subject to change. Issuance