See the reference section … The simplest way by far is to select a prospective bolt, calculate the clamping force this creates when it is torqued to rated torque, and use the bolt circle as an approximation of the moment arm. BOLTCALC - Bolted Joint Analysis Program: bcdemo.exe (7.87 MB) TORQUE - Torque Tightening Analysis Program: torquedemo.exe (5.14 MB) Kb – bolt spring rate. Metric Bolt Torque Calculator. clamping energy shown on the torque-angle plot has the same value as the areas under the bolt and clamped component lines in the Force-Deformation Diagram (refer to Figure 9). They are of two types, metric flange bolts and metric hex bolts. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. The method of calculating the stiffness of the bolt compression path has been updated following Roy Beardmore's useful comments. Pipe Stress Clamping Force . Clamping Force Calculator Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. The clamping force works anywhere as long as it is within clamping stroke range. The required bolt clamping force for a joint is 20000 lbs. The clamping force is required to prevent joint movement being caused as a result of axial and/or shear forces. It is force to keep mold closed when injection machine push molten plastics in to injection mold. For ordinary applications like car wheel lugs or headbolts , the manufacturer has the experience to know the torque levels to apply. For ordinary applications like car wheel lugs or headbolts , the manufacturer has the experience to know the torque levels to apply. I am curious, why do you need to calculate the force? Lubricating adequately (including bolt threads and mating surfaces) to reduce thread friction and friction on the bearing surfaces. Typical metric and imperial bolyt torques. Bolt torque calculator metric (vdi 2230) Bolt torque calculator metric. You can target the Engineering ToolBox by using AdWords Managed Placements. The torque required for a 3/4″ dry steel bolt to achieve this tension can be calculated as. Norbar has devised easy-to-use online calculators that support the correct application of torque in three key areas: Unit conversion to assist international measurement definitions. This is. + Toggle System: It is “toggle link”. Tightening Torque for Unlubricated Steel Bolts. The calculation is carried out in metric or English units. The required clamping force can be calculated from the cavity pressure inside the mold and the shot projected area, on which this pressure is acting. Welcome to our technical resource library! T dry = (0.2) (20000 lb) (0.75 in) = 3000 (in lb) = 3000 (in lb) / 12 (in/ft) = 250 (ft lb) Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. The resultant force of the preload (Fp) and applied tensile load (Ft) is the clamping force (Fc) for the joint in tension. Grade 5 … Some additional sources of post-yield response that can affect the amount of clamping force are shown in Figure 6. Too much clamping force can also cause severe problems. Clamping Force Calculator is a tool to calculate the Clamping Force in the injection molding machine based on the different area’s like part projected area, runner projected area, cavity pressure and number of cavities. This post will explain about clamping device, calculation of the clamping force, projected area and injection pressure,… To calculate the clamp force in pounds (or newtons), you simply need to multiple the bolt rating by the cross-sectional area. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. This is can be dependent on a number of factors, but is largely a function of the preload force, the force exerted in compressing the bolt, and the tension force, the force exerted in pulling the bolt apart. Example - Required torque for tightening a Imperial bolt. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. Note: Accessing this resource requires an active Premium Membership with Engineers Edge. Thanks. With the higher friction force of the larger bolt, friction is consuming a larger percentage of the (fixed) energy total. Tightening Torque for Unlubricated Steel Bolts. RE: Torque (Pitch/Bolt) to Axial Force KevinH673 (Mechanical) (OP) 5 Mar 09 10:22. ; Torque extension for setting correct values; Torque tension to identify precise levels of torque to be applied for individual applications. Example – Required torque for tightening a Imperial bolt. When various factors are typed into the Input cells, Excel will calculate results automatically. Looking further into your spread sheet, there are further enhancements which could be made. Bolt Clamping Force vs. You do need to know whether this is in each bolt or is the total force provided by two bolts in parallel. This is can be dependent on a number of factors, but is largely a function of the preload force, the force exerted in compressing the bolt, and the tension force, the force exerted in pulling the bolt apart. 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