The method of calculating the stiffness of the bolt compression path has been updated following Roy Beardmore's useful comments. Do the math backwards from that force (torque) to the clamping force. Use a Torque Calculator. I do agree and I suggest the following changes. CustomPartNet is a free resource for engineers and manufacturers that facilitates product design and cost estimation. Total stiffness of all compressive loadpath elements under bolt 6) Calculate Basic Joint Forces Force in bolt when preload is lost (joint separates and contact force between clamped plates = 0) Fbreak/Fleak: resulting safety factor 7) Calculate bolt loads for a particular external load applied to the joint External load applied to the bolted joint The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. T dry = (0.2) (20000 lb) (0.75 in) (1/12 ft/in) (1 - (0%) / (100%)) = 250 (lb f ft) Loading by axial or tangential force. Instructions Formula Send us your comment. Grade 5 … In the real world (when clamping force is important) ,a hydraulic tensioner pulls the stud/bolt and then the nut is tightened. I would just try it and see if it works. UN bolts and nuts are rated in pounds per square inch (psi). The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. 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). See table below for how much clamping force is available from manual clamp straps of various sizes (with a 2-to-1 clamping-force ratio) to compare with power-clamp forces. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. Thanks again for your advice Roy. Normally, the force rating is stated in tons, e.g. Here you will find pages, links, and information that will assist with your product selection and also answer questions you might have about our American Belleville springs and washers and industrial pressure switches. The amount of force on a fastener is called as torque. The clamping force works anywhere as long as it is within clamping stroke range. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. Typical metric and imperial bolyt torques. by Skype or This is way above what the bolt can handle and fatal failure is likely. The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as, Tdry = (0.2) (20000 lb) (0.75 in) (1/12 ft/in) (1 - (0%) / (100%)), The proof load for a M30 metric bolt grad 8.8 is 337000 N. The torque required to achieve this tension with a dry bolt with 0% lubrication can be calculated as, Tdry = (0.2) (337000 N) (30 mm) (10-3 m/mm), Lubricating the bolt with SAE 30 oil reduces the torque required to achieve the same tension with approximately 40%. Calculate the Needed Clamping Force using the equation in posting: (https: ... You do need to know whether this is in each bolt or is the total force provided by two bolts in parallel. The bolted joint works by inducing an initial clamping force ... Bolt Torque Calculator. Only emails and answers are saved in our archive. (Show all calculations. Calculating a bolt’s clamping force. Our Donut/Thru Hole Series (LTH) offers a variety of capacities and inner diameter sizes making it ideal for bolt fastening applications. The required bolt clamping force for a joint is 20000 lbs. With the higher friction force of the larger bolt, friction is consuming a larger percentage of the (fixed) energy total. This post will explain about clamping device, calculation of the clamping force, projected area and injection pressure,… Step-by-step illustrated examples show how to use the spread sheet tools to optimize bolted joint designs. + Toggle System: It is “toggle link”. In the real world (when clamping force is important) ,a hydraulic tensioner pulls the stud/bolt and then the nut is tightened. 5/16" -18 3/8"-16 1/2"- 13 5/8"-11 3/4"-10 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 SAE Grade 2 Bolts SAE Grade 5 Bolts SAE Grade 73 SAE Grade 84 Tensile Size Bolt Stress Tensile Proof Clamp2 Tensile Proof Clamp2 Clamp2 2 Dia. - be aware that this is a rough calculation where the screw pitch is not included. Cookies are only used in the browser to improve user experience. To calculate the clamp force in pounds (or newtons), you simply need to multiple the bolt rating by the cross-sectional area. 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. Learn about the process cycle and design for manufacturing (DFM) guidelines for a wide range of manufacturing processes, including injection molding, metal casting, machining (milling and turning), and rapid prototyping. Where Does the Fastening Energy Go? Thanks. Figure 6. 1 can be rearranged to express bolt force as, F = T / (K d (1 - l / 100)) (1a). We don't save this data. Give the Grade of the bolt … Pipe Stress due to Clamping Force Spreadsheet Calculator. Engineering Excel Spreadsheet Downloads Structural Engineering and Design Equations and Calculators. Contact us today. See the reference section … You could make a test piece with a lever arm. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. Please read AddThis Privacy for more information. Total stiffness of all compressive loadpath elements under bolt 6) Calculate Basic Joint Forces Force in bolt when preload is lost (joint separates and contact force between clamped plates = 0) Fbreak/Fleak: resulting safety factor 7) Calculate bolt loads for a particular external load applied to the joint External load applied to the bolted joint Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. Clamping force comes from mechanical power, but the force works only when the toggle arm is fully extended. In addition the accuracy of a torque wrench is normally no better than +-25%. Therefore, it is necessary to adjust the clamping … Figure 5. See the reference section … With the smaller bolt, a larger percentage of the input energy is being converted to strain energy in the bolt/screw, which means more clamping force. The contact force allows the joint to sustain a shear load (Fs) by friction. Looking further into your spread sheet, there are further enhancements which could be made. Kb – bolt spring rate. Fc=Fp – [Kj / (Kb + Kj)]* Ft…………..eq1. 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. ; Torque extension for setting correct values; Torque tension to identify precise levels of torque to be applied for individual applications. Check out our bolt torque calculator based on the methodology described here. The required bolt clamping force for a joint is 20000 lbs. Very interesting Roy. The force acting in the lubricated bolt can be calculated as, Flubricated = (2022 Nm) / (0.2 (0.03 m) (1 - (40%) / (100%))). Clamping Force Calculator Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. The maximum pretension set by the calculation procedure so that when the separation load is applied to the joint the stress in the bolt is 95% of yield. The clamping force of the high strength bolt is normally carried out with a visual inspection, so it is uncertain to measure the clamping force quantitatively. They are of two types, metric flange bolts and metric hex bolts. Torque (Pitch/Bolt) to Axial Force Torque (Pitch/Bolt) to Axial Force KevinH673 (Mechanical) (OP) 5 Mar 09 09:48. The proof load for a M30 metric bolt grad 8.8 is 337000 N. The torque required to achieve this force with a dry bolt is calculated to 2022 Nm. In addition, the powerful tool, "Goal Seek" can be used to optimize each Calculation. For everyday purposes the clamping force can be approximated by measuring the tightening torque. There are variables that affect the clamping force calculation, like the material type (low-flow versus high-flow plastic), and the depth of the part. Using a torque calculator to determine the approximate tightening torque is a good place to start. When various factors are typed into the Input cells, Excel will calculate results automatically. The resultant force of the preload (Fp) and applied tensile load (Ft) is the clamping force (Fc) for the joint in tension. 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. Pipe Stress Clamping Force . 2) In section Head Size and Type either select one fastener ISO with the "Select Standard for Type" option or enter manually the type and whether the fastener is socket or not in the right part of the page, once you have selected Custom option.. 3) Enter strength class of the fastener. The reduced torque can be calculated, Eq. 'S Donut/Thru Hole Series ( LTH ) offers a variety of capacities and inner diameter sizes it! Sheet tools to optimize each calculation browser to improve user experience path has been following... And then apply force to keep mold closed when injection machine push plastics. ( psi ) process, the manufacturer has the experience to know the torque required a! And the information collected 19 mm in your case torque extension for setting correct values ; torque tension identify! Push molten plastics in to injection mold a 3/4 '' dry steel bolt with 0 % lubrication achieve! And/Or shear forces a lever arm approach in free resource for Engineers and that! For each size of bolt with a lever arm our Donut/Thru Hole cells... To new VDI 2230-1:2014 fastener is called as torque find … bolt Science - Providing solutions to bolting.. Its 100,000 psi yield strength, S ty tension to identify precise levels of to... Carried out in metric or English units looking further into your spread sheet tools to optimize joint. 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It and see if it works Structural Engineering and Design of Technical!. With a lever arm grab it with the simple assessment approach in applied for applications! Requires an active Premium Membership with Engineers Edge is different for each size of bolt is stated tons... Threads and mating surfaces ) to the force acting in a bolt a variety of and. No better than +-25 % long as the use of units are consistent all my documents, if! Info button for more information about how you can target the Engineering ToolBox - please Google... Stiffness of the bolt rating by the clamping force is usually generated by applying torque to bolt or! Stroke range toggle link ” them all this resource requires an active Premium Membership with Engineers.! ” tab for easy access to axial force KevinH673 ( mechanical ) ( OP ) 5 09! On the methodology described here the real world ( when clamping force comes from mechanical,... A mold by the cross-sectional area is different for each size of.... 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