Views
8 years ago

FALL 2015

  • Text
  • Fastener
  • Fasteners
  • Products
  • Distributors
  • Washers
  • Manufacturing
  • Distributor
  • Screws
  • Association
  • Industrial
Distributor's Link Magazine Fall Issue 2015 / Vol 38 No4

8 THE DISTRIBUTOR’S

8 THE DISTRIBUTOR’S LINK Bengt Blendulf Bengt Blendulf was educated in Sweden and moved to the US in 1974 to start a subsidiary for a Swedish fastener manufacturer. After working as a technical consultant on the faculty of the College of Engineering and Science at Clemson University, he established EduPro US in 1997 to teach highly rated courses in Fastening Technology in the US, Canada, Mexico, Europe and Asia. Being one of the founders, Bengt served as the chairman of ASTM F16.96 Bolting Technology from 1996 to 2006. In 2006 he received the Fred F. Weingruber award from ASTM for “his efforts to promote and develop standards for the fastener industry.” In 2013 he also received IFI’s Soaring Eagle Award for “significant contributions to the technological advancement of the fastener industry”. Bengt is the author of an extensive lecture book, well over 110 articles and “Mechanical Fastening and Joining”, a book published in 2013 by the Industrial Fasteners Institute. He can be contacted through www.edupro.us or by email bblendulf@yahoo.com. VDI 2230 AND SR1- A SYSTEMATIC WAY OF DEVELOPING RELIABLE JOINTS When I joined the fastener industry back in 1966 (50 years next year!!), bolted/screwed joints were often subjects to a lot of guesswork. Honestly, that is still case too many times. The German Society of Engineers, VDI, had just initiated a very serious and detailed study of high strength bolted/screwed joints, laying the ground work for what was to become the VDI 2230 design guideline. We worked along the same line at the Swedish company I worked for (Bulten) at the time (1966-1978). We were fortunate to have Dr. Karl-Heinz Kübler on our engineering staff. Dr. Kübler later became one of the leading members of the VDI 2230 development group, which also included Gerhard Junker. Herr Junker, who worked as the Director of Engineering for Unbrako – SPS Technologies in Europe, served as the chairman for VDI 2230 in the beginning. The guideline was first published in 1977 by VDI. It is still an ongoing engineering project and is continuously updated with new research being completed. To use the guideline manually is a very complex and time consuming methodology requiring both patience and a high level of discipline from the design engineer using a calculator or slide rule (maybe not anymore). Jakob Kluser, at that time the engineering manager for Bossard in Switzerland, contacted Texas Instrument in Switzerland, Dr.-Ing. Michael Galwelat at the Technical University in Berlin and myself to discuss the possibility of finding a way to simplify the use of VDI 2230 by employing electronic media. This work eventually resulted in the Bossard Screw Calculator, based on a modified T-58 programmable calculator. I introduced this concept in the United States in 1983 and it was met with a great deal of interest by engineers from the automotive industries, NASA and independent bolting experts. The predicted sales success for the calculator did not materialize since CONTRIBUTOR ARTICLE corporate lawyers warned engineering from using it due to its “foreign” origin and its complexity. The, however unlikely, possibility of mis-use resulting in lawsuits scared the day-light out of the non-engineers who could not understand and/or appreciate the obvious design benefits. Hindsight is always 20/20. If we had waited a couple of more years we could have had the guideline on floppy discs to be used on personal computers, more and more common on the desks of engineers in the 1980’s. There would also have been lots of recommendations available from industrial users in Europe where engineers, not lawyers, typically make technical decisions. That is, of course, now “water under the bridge”. The interesting, and for me gratifying, thing was that within the next 10-20 years many industries in the US and other countries adopted the VDI 2230 concept (not the calculator) for the majority of their critical joint designs. Even those engineers, who were earlier frightened by lawyers and other “joint ignorant” individuals, joined in. What helped in this process was the development of computer software to make the guideline more practical to work with. With all the “ready-made” mathematic formulae and the access to a broad data base for materials, tightening methods and many other variables, designing a highly stressed bolted/screwed joint now became almost like a “walk in the park.” Let me now illustrate how this design tool (SR1) makes it possible to verify a joint and to make necessary adjustments when needed. Figure 1 shows a relatively straight forward bolted joint using a Hex Head Bolt and a Hex Nut to clamp two steel plates together. In my 2-day fastener engineering class my students will learn how to do the initial estimates of size and property classes and to verify by using VDI 2230. CONTINUED ON PAGE 134

  • Page 8: 6 THE DISTRIBUTOR’S LINK The Gilc
  • Page 14: 12 THE DISTRIBUTOR’S LINK Robert
  • Page 26: 24 THE DISTRIBUTOR’S LINK Joe Gre
  • Page 30: 28 THE DISTRIBUTOR’S LINK Jim Tru
  • Page 34: 32 THE DISTRIBUTOR’S LINK ERP sof
  • Page 41 and 42: THE DISTRIBUTOR’S LINK 35
  • Page 44: 38 THE DISTRIBUTOR’S LINK THE OLA
  • Page 48: 42 THE DISTRIBUTOR’S LINK Richard
  • Page 51 and 52: THE DISTRIBUTOR’S LINK 45
  • Page 54: 48 THE DISTRIBUTOR’S LINK Guy Ave
  • Page 58: 52 THE DISTRIBUTOR’S LINK Magi Gr
  • Page 62 and 63:

    56 THE DISTRIBUTOR’S LINK FASTENE

  • Page 64:

    58 THE DISTRIBUTOR’S LINK Bart Ba

  • Page 68:

    62 THE DISTRIBUTOR’S LINK GLOBALF

  • Page 73 and 74:

    THE DISTRIBUTOR’S LINK 65 NORTH E

  • Page 75 and 76:

    AVK INDUSTRIAL PRODUCTS 25323 Rye C

  • Page 78:

    70 THE DISTRIBUTOR’S LINK GLOBE I

  • Page 81 and 82:

    THE DISTRIBUTOR’S LINK 73 Your re

  • Page 84:

    76 THE DISTRIBUTOR’S LINK MW INDU

  • Page 87 and 88:

    CSM FASTENER PRODUCTS 2451 Estes Av

  • Page 90:

    82 THE DISTRIBUTOR’S LINK MSI PRO

  • Page 93 and 94:

    THE DISTRIBUTOR’S LINK 85 FCH SOU

  • Page 96 and 97:

    88 THE DISTRIBUTOR’S LINK GLOBALF

  • Page 98 and 99:

    90 THE DISTRIBUTOR’S LINK FASTENE

  • Page 100:

    92 THE DISTRIBUTOR’S LINK BEACON

  • Page 104:

    96 THE DISTRIBUTOR’S LINK WOMEN I

  • Page 110:

    98 THE DISTRIBUTOR’S LINK FIELD 9

  • Page 113 and 114:

    CARNEY CONSULTING GROUP LLC 1200 Ju

  • Page 116:

    104 THE DISTRIBUTOR’S LINK NORTH

  • Page 120 and 121:

    FASTENERTECH ’15 - RECEPTION ROSE

  • Page 122:

    110 THE DISTRIBUTOR’S LINK FASCO

  • Page 126 and 127:

    114 THE DISTRIBUTOR’S LINK NATION

  • Page 128:

    116 THE DISTRIBUTOR’S LINK OBITUA

  • Page 132:

    120 THE DISTRIBUTOR’S LINK PIVOT

  • Page 135 and 136:

    THE DISTRIBUTOR’S LINK 123 E-Z LO

  • Page 138 and 139:

    126 THE DISTRIBUTOR’S LINK SPIROL

  • Page 140:

    128 THE DISTRIBUTOR’S LINK NUCOR

  • Page 143:

    SEMS AND SPECIALS INC 6483 Falcon R

  • Page 147 and 148:

    THE DISTRIBUTOR’S LINK 135

  • Page 150 and 151:

    138 THE DISTRIBUTOR’S LINK JOE DY

  • Page 152 and 153:

    140 THE DISTRIBUTOR’S LINK Bright

  • Page 154 and 155:

    142 THE DISTRIBUTOR’S LINK ROBERT

  • Page 156:

    144 THE DISTRIBUTOR’S LINK NIFMSE

  • Page 159 and 160:

    THE DISTRIBUTOR’S LINK 147

  • Page 161 and 162:

    THE DISTRIBUTOR’S LINK 149 AEH (A

  • Page 163 and 164:

    THE DISTRIBUTOR’S LINK 151

  • Page 166 and 167:

    154 THE DISTRIBUTOR’S LINK MICHAE

  • Page 168:

    156 THE DISTRIBUTOR’S LINK The Fa

  • Page 172:

    160 THE DISTRIBUTOR’S LINK RICHAR

  • Page 175 and 176:

    SET SCREW & MFG, INC 1210 Saint Cha

  • Page 178 and 179:

    166 THE DISTRIBUTOR’S LINK GUY AV

  • Page 180:

    168 THE DISTRIBUTOR’S LINK Micro

  • Page 183 and 184:

    THE DISTRIBUTOR’S LINK 171 UMETA

  • Page 185 and 186:

    Smalley Steel Ring Company, is plea

  • Page 188:

    NFDA 2015 ANNUAL MEETING - WELCOME

  • Page 191:

    THE DISTRIBUTOR’S LINK 179

  • Page 200:

    188 THE DISTRIBUTOR’S LINK ANTHON

  • Page 203 and 204:

    THE DISTRIBUTOR’S LINK 191 Plans

  • Page 206 and 207:

    194 THE DISTRIBUTOR’S LINK MID-AT

  • Page 208 and 209:

    196 THE DISTRIBUTOR’S LINK ROTORC

  • Page 210 and 211:

    198 THE DISTRIBUTOR’S LINK GROOV-

  • Page 212 and 213:

    FASTENERTECH ’15 ROSEMONT, IL - J

  • Page 214:

    202 THE DISTRIBUTOR’S LINK INDUST

  • Page 217 and 218:

    THE DISTRIBUTOR’S LINK 205 SOUTHW

  • Page 220:

    208 THE DISTRIBUTOR’S LINK BENGT

  • Page 223 and 224:

    THE DISTRIBUTOR’S LINK 211

  • Page 225 and 226:

    FASTENERTECH ’15 ROSEMONT, IL - J

  • Page 228 and 229:

    216 THE DISTRIBUTOR’S LINK MICHAE

  • Page 230:

    218 THE DISTRIBUTOR’S LINK WOODRU

  • Page 234 and 235:

    222 THE DISTRIBUTOR’S LINK NFDA T

  • Page 236 and 237:

    224 THE DISTRIBUTOR’S LINK ROBERT

  • Page 238 and 239:

    226 THE DISTRIBUTOR’S LINK CARMEN

  • Page 240 and 241:

    228 THE DISTRIBUTOR’S LINK LAUREN

  • Page 242:

    230 THE DISTRIBUTOR’S LINK MICHAE

  • Page 245 and 246:

    THE DISTRIBUTOR’S LINK 233

  • Page 248:

    236 THE DISTRIBUTOR’S LINK RICHAR

  • Page 251 and 252:

    THE DISTRIBUTOR’S LINK 239

  • Page 253 and 254:

    THE DISTRIBUTOR’S LINK 241

  • Page 256:

    244 THE DISTRIBUTOR’S LINK John G

SHARE A PAGE FROM THIS MAGAZINE

OPTION 1: Click on the share tab above, or OPTION 2: Click on the icon (far right of toolbar) and then click on the icon (top right of the page).

Copyright © Distributor's Link, Inc. All Rights Reserved | Privacy Policy