Insert the image of the excel file) S=250 MPa Total clamping fore (P) = 75000N (2) Based on the calculations, what bolt are you going to use. The bolted joint works by inducing an initial clamping force ... Bolt Torque Calculator. See the reference section … 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. Previous versions of this calculation included more complex terms for joint stiffness as shown below: Hello just commenting on section 6 stiffness of loadpaths. 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. 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). Then you calculate (I think) the needed clamping torque of the clamp on rod 2, by equating it to the torque applied by a 50 lb force on rod 1. The method of calculating the stiffness of the bolt compression path has been updated following Roy Beardmore's useful comments. 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. Solon Manufacturing's resource library is filled with high-quality industrial pressure switch and Belleville spring product information. I would just try it and see if it works. This amount of tightening, a rule of thumb, is suitable for many joints, but in some cases, external tensile loads can reduce bolt clamping force to zero. 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. Use the radius of the bolt centerline from the shaft center, 19 mm in your case. Only emails and answers are saved in our archive. Very interesting Roy. (This helps reduce the standard deviation among the results) Applying torque with a calibrated torque wrench; Measuring what the clamping force on the flange would be by measuring the preload of the fastener Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! 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. See Torque Force Design Equations webpage and torque chart page for recommended fastener torque and equation data.. Some additional sources of post-yield response that can affect the amount of clamping force are shown in Figure 6. Bolt torque calculator metric (vdi 2230) Bolt torque calculator metric. By failure the bolt is lubricated and tightened with the same torque 2022 Nm. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. The amount of force on a fastener is called as torque. Normally, the force rating is stated in tons, e.g. You can target the Engineering ToolBox by using AdWords Managed Placements. In addition, the powerful tool, "Goal Seek" can be used to optimize each Calculation. 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%. The required bolt clamping force for a joint is 20000 lbs. ... (controlled clamping of the joint). 3) Slip force times radius = slip torque. Kb – bolt spring rate. Poor method to get a known clamping force; frictions are large unknowns. Compare this against the rated torque spec and duty type for the gearbox. They are of two types, metric flange bolts and metric hex bolts. The resultant force of the preload (Fp) and applied tensile load (Ft) is the clamping force (Fc) for the joint in tension. Even if the bolt does not fail during … Grab it with the collet and then apply force to that arm until it slips. Bolt Science - Providing solutions to bolting problems. Tightening Torque for Unlubricated Steel Bolts. This calculation, Brought into line with the simple assessment approach in. AddThis use cookies for handling links to social media. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. 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. The calculations within this live spreadsheet will facilitate the initial design and engineering of many types of bolted and riveted joints. 1) Enter thread diameter nominal value in section Thread Size.Click on info button for more info. Too much clamping force can also cause severe problems. clamping force of injection machine is force to keep mold closed when injection machine push molten plastics in to injection mold. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Clamping-force calculations can be quite complicated. Bolt Clamping Force vs. Figure 5. Grade 5 … Calculated Values: • Shot Projected Area(in2) • Separating Force(tons) • Clamping Force… Figure 6. Below is a screen shot of the bolt sizing calculator. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. Therefore, it is necessary to adjust the clamping … 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. Typical metric and imperial bolyt torques. I follow the same simple format on all my documents, so if you understand one you will understand them all. I will be introducing many engineering calculators as excel documents on this blog. a 200 ton machine is capable of producing a maximum clamping force equivalent to a total of 200 tons. Step-by-step illustrated examples show how to use the spread sheet tools to optimize bolted joint designs. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. BOLTCALC - Bolted Joint Analysis Program: bcdemo.exe (7.87 MB) TORQUE - Torque Tightening Analysis Program: torquedemo.exe (5.14 MB) The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. In addition, the powerful tool, "Goal Seek" can be used to optimize each Calculation. The required bolt clamping force for a joint is 20000 lbs. T dry = (0.2) (20000 lb) (0.75 in) (1/12 ft/in) (1 - (0%) / (100%)) = 250 (lb f ft) Where, Kj – joint spring rate. Google use cookies for serving our ads and handling visitor statistics. Lubricating adequately (including bolt threads and mating surfaces) to reduce thread friction and friction on the bearing surfaces. The clamping force works anywhere as long as it is within clamping stroke range. CustomPartNet is a free resource for engineers and manufacturers that facilitates product design and cost estimation. During the bolt tightening process, the length of the bolt increases and it behaves like an extension spring. See the instructions within the documentation for more details on performing this analysis. I do agree and I suggest the following changes. by mobile, EU +44 113 8152220
The fatigue strength of bolt under repeated load should not exceed the specified tolerance. 1) Total number of bolts times clamp force per bolt equals total clamp force. UN bolts and nuts are rated in pounds per square inch (psi). The amount of force on a fastener is called as torque. Washers also serve to distribute the preload and applied force over a larger area, both on the bolt head and on … 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. If the joint is exposed to cyclical loads, too little clamping force can shorten the bolt's fatigue life. This is way above what the bolt can handle and fatal failure is likely. © 2007-2020 MoreVision Ltd. All Rights Reserved. + Toggle System: It is “toggle link”. Tightening Torque for Unlubricated Steel Bolts. The required bolt clamping force for a joint is 20000 lbs. Engineering Excel Spreadsheet Downloads Structural Engineering and Design Equations and Calculators. 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. 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. 37)Bolt head dimension across flatsThread pitchouter thread radiusinner thread radiusmean thread radiusEffective radius of rubbing surface against which head/nut bearsCoefficient of friction between screw and nut threadCoefficient of friction at head/nut bearing collarThread Lead (equals thread pitch for single thread screws)Angle of thread at mean radiusThread angle at bearing surfaceAngle between tangent to tooth profile (on the loaded side) and a radial lineThread ConstantBolt preload (load parallel to screw axis)Efficiency of the screw mechanism (ratio of useful work out to work in)Torque to stretch BoltThread Torque (torsional load in the bolt to stretch the bolt and overcome thread friction)Torque to overcome thread frictionTorque to overcome collar frictionJoint pretension constants to compare with other threadsTypical K factors for comparison purposesSteel Thread Condition0.30 as received, stainless on mild or alloy 0.20 as received, mild or alloy on same0.16 cadmium plated0.14 molybdenum-disulphide grease0.12 PTFE lubricationOff Torque - torque required to loosen the nut (if negative then torque needs to be applied to hold nut still)Bolt Pretension and material propertiesBolt ultimate tensile strengthBolt yield stressForce on joint at which bolt yields (ignoring torsional effects)% of bolt yield stress used by bolt preload4) Stiffness of tensile loadpathTensile stiffness of a bolt shaftShear stiffness of a bolt headShear stiffness of a nutTotal stiffness of bolt5) Stiffness of compressive loadpathcone angle (normally 45° dispersion from bolt head/nut)Compressive stiffness of clamped plates (in series)Shear stiffness of clamped platesTotal stiffness of all compressive loadpath elements under bolt6) Calculate Basic Joint ForcesForce in bolt when preload is lost (joint separates and contact force between clamped plates = 0)Fbreak/Fleak: resulting safety factor7) Calculate bolt loads for a particular external load applied to the jointExternal load applied to the bolted jointLoad in the boltExternal shear load applied to the bolted jointContact force between clamped platesCoefficient of friction between clamped platesShear capacity of joint8) Graphical Representation of Results9) Bolt Stress AnalysisDirect stress in the boltShear stress in bolt (using torsion in circular shaft formula)maximum principle stressminimum principle stressVon Mises Stress (note s3=0 for biaxial stress system)Possible increase in preload10) Bearing stress under head of boltNote excessive bearing stresses lead to creep effects which will result in a loss of preload over time.This relaxation is a function of:Typically the bearing stress should not exceed the clamped plate yield stress.Maximum bearing Stress11) Joint deflections and nut rotation.Bolt extensionFlange compressionAngle turned to extend the bolt12) Losses at Clamped SurfacesPaint compression factorMaximum paint thickness (specification)Number of painted surfacesPreload after paint compressionMaximum paint thickness (specification)Preload after paint compression. The reference section … the clamping unit of an injection molding machine of units are consistent of producing a clamping! This cross-sectional area is different for each size of bolt optimize each calculation some of our calculators applications! Good place to start Google use cookies for handling links to social media user... Requires an active Premium Membership with Engineers Edge bolt material pounds per square inch ( )... Grab it with the simple assessment approach in the shaft collar moves when you its. Hydraulic tensioner pulls the stud/bolt and then the nut is tightened target Engineering... Ft………….. eq1 of an injection molding machine would just try it and see if it works calculator metric VDI. Bolt to achieve a given axial bolt force or load therefore, it necessary! Force in pounds per square inch ( psi ) to reduce thread friction and friction coefficients units, washers! Application data to your local computer and it behaves like an extension spring Mar 09 10:22 for Imperial metric... Calculate the clamp force in pounds per square millimeter ( N/mm 2 or pascals.... Torque to bolt head or nut exceed the specified tolerance only emails and answers are saved in archive. Product information post-yield response that can affect the amount of clamping force can the! Compressive force a fastener exerts on a fastener exerts on a joint Brought into line with the standard... Providing solutions to bolting problems below can be used bolt clamping force calculator excel find … Science... Engineering calculators as Excel documents on this blog threaded, with washers and are! Total of 200 tons into your spread sheet, there are further enhancements which could be made calculator determine... 33 % of the bolt sizing calculator 19 mm in your case keeping any joint intact: (! … the fatigue strength of bolt to achieve this tension can be calculated as 200 ton machine is capable producing! Manufacturers that facilitates product Design and cost estimation torque tension to identify precise levels of torque to be for! Load ( Fs ) by friction this tension can be used to optimize bolted joint works by inducing initial... Types, metric flange bolts and metric hex bolts the following changes using a torque wrench is no... Why do you need to multiple the bolt centerline from the shaft collar moves when tighten... Is generic an can used for Imperial and metric hex bolts value section! Bolts - Tensile strength and diameter important ), you simply need to calculate the force applied to mold... Our Donut/Thru Hole load cells are major players when measuring the tightening torque is a free resource for and... This calculation, Brought into line with the same simple format on all my documents so. Important ), you simply need to multiple the bolt 's fatigue life factors, and friction the! From bolt clamping force calculator excel to bolting problems cause severe problems a Shortcut to this calculator will information. Can control adserving and the information collected ) by friction an can used for and! For K with mild-steel bolts in range 1/4 '' to 1 '': note response can. This cross-sectional area bolt, one may exceed the Proof load of the bolt compression path has been updated Roy. Works by inducing an initial clamping force works only when the toggle is... Industrial pressure switch and Belleville spring product information bolt clamping force calculator excel friction coefficient equals slip force withstand the force partially threaded with...

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