Delta pt54螺钉.pdf

DELTA PT Innovative Fastening Solutions for Thermoplastics and Thermoset Materials automotive appliances wireless/telecom/business machines The ATF Delta PT? offers the established benefits of the PT? screw: ? Minimum radial stress ? Optimum pitch - high non-reversibility ? Optimum material flow during threadforming ? Low carbon, through hardened steel (RC 33-39) In addition to the following important benefits: The multi-angled thread profile of the Delta PT? follows the natural flow of the material to provide maximum engagement. Newly designed flank geometry for better deformation of the plastic material during the fastening process. A substantial increase in joint life in terms of resistance to both static and dynamic stress. Increased torsional and tensile load capacities by up to 50%. A refined pitch allows use of shorter fasteners and the increased minor diameter allows use of smaller diameters. The Delta PT? calculation program allows a clamp load oriented design without the requirement of physical testing. Increased head diameter leads to reduced surface pressure in the under-head area. Increased vibration safety by improved pitch. Improved mechanical strength by new cross-sectional area. High clamp load at smaller contact pressure, by increased flank engagement. PT? Screw DELTA PT? Screw Natural flow of material Delta PT? thread DELTA PT 2 Reduction of Fastener Length and/or Diameter (See Figure 3) This example illustrates how a shorter and smaller diame- ter screw can be used in some applications as a direct result of the refined pitch and increased minor diameter. As shown in the table, a given flank engagement (Afl), the required installation depth (di ) can be calculated. As is shown, the installation depth for the Delta PT? is shorter than that required for the PT?. This reduction of required installation depth is a direct result of the decreased pitch of the Delta PT?. Comparison of the breaking torques (TB) shows that the Delta PT? with a smalle