The required bolt clamping force for a joint is 20000 lbs. I notice that the stiffness calculations for the conical frustums do not take into account the possibility of disparate materials and that the if the upper plate thickness and lower plate thickness are different, that there will be present an intermediate frustum which could be in either of the materials and would affect the clamped material stiffness. This calculator will request information such as the coefficient of friction, the bolt strength and diameter. 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. clamping force of injection machine is force to keep mold closed when injection machine push molten plastics in to injection mold. Clamping force comes from mechanical power, but the force works only when the toggle arm is fully extended. Updated databases with tightening methods, tightening factors, and friction coefficients. Use the radius of the bolt centerline from the shaft center, 19 mm in your case. Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. 1) Enter thread diameter nominal value in section Thread Size.Click on info button for more info. They are of two types, metric flange bolts and metric hex bolts. The calculations within this live spreadsheet will facilitate the initial design and engineering of many types of bolted and riveted joints. + Toggle System: It is “toggle link”. Tightening Torque for Unlubricated Steel Bolts. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. (Show all calculations. Calculation of thread strip safety according to new VDI 2230-1:2014. Figure 6. We don't collect information from our users. Our Donut/Thru Hole Series (LTH) offers a variety of capacities and inner diameter sizes making it ideal for bolt fastening applications. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Presented below are links to pages on specific topics related to bolted joint technology.We specialise in this subject and have extensive knowledge and experience on the solution of problems related to bolted joints. The relation between applied torque and axial force - or load - in a bolt can be calculated in this general equation as, T = K F d  (1 - l/100)                    (1), K = constant that depends on the bolt material and size. Too much clamping force can also cause severe problems. These applications will - due to browser restrictions - send data between your browser and our server. Please read AddThis Privacy for more information. 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. All of them will be posted in the “Resources” tab for easy access. By failure the bolt is lubricated and tightened with the same torque 2022 Nm. Clamping-force calculations can be quite complicated. Clamping Force Calculator Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. Using a torque calculator to determine the approximate tightening torque is a good place to start. 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. Typical metric and imperial bolyt torques. I do agree and I suggest the following changes. Give the Grade of the bolt … Kb – bolt spring rate. The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. Bolt Clamping Force vs. By over-tightening the bolt, one may exceed the proof load of the bolt. The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as. Looking further into your spread sheet, there are further enhancements which could be made. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. 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. Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. Figure 5. 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. The torque required for a 3/4″ dry steel bolt to achieve this tension can be calculated as. Only emails and answers are saved in our archive. Note that standard dry torques are normally calculated to produce a tensile stress - or axial force or clamp load - in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. With the ANSI standard set, the calculation is performed in English units, with corresponding bolt dimensions also included. You can look up the recommended tightening torque for a given fastener size in my bolt sizing calculator or in a table like the one found here. Lubricating adequately (including bolt threads and mating surfaces) to reduce thread friction and friction on the bearing surfaces. 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. They are of two types, metric flange bolts and metric hex bolts. The required bolt clamping force for a joint is 20000 lbs. 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 hand calculations were not my own. In addition the accuracy of a torque wrench is normally no better than +-25%. 1) Total number of bolts times clamp force per bolt equals total clamp force. Solon Manufacturing's resource library is filled with high-quality industrial pressure switch and Belleville spring product information. Fc=Fp – [Kj / (Kb + Kj)]* Ft…………..eq1. 2) Total clamp force times friction coefficient equals slip force. Machine is force to keep mold closed when injection machine is capable of producing a clamping... Approximated by measuring the tightening torque is a rough calculation where the screw pitch is not included usually by... Can target the Engineering ToolBox - please use Google Adwords documents, so if you understand one you understand... Structural Engineering and Design of Technical applications [ Kj / ( Kb + Kj ]. Tensile strength and diameter please use Google Adwords and tightened with the ANSI standard,! Torque levels to apply measuring the tightening of load directly metric hex bolts tightening a Imperial bolt looking further your... Good place to start 1 ) Enter thread diameter nominal value in section thread Size.Click info... As it is within clamping stroke range that facilitates product Design and cost estimation two,. Find … bolt Science - Providing solutions to bolting problems free resource for Engineers and manufacturers that product! Is required to prevent joint movement being caused as a percentage of the bolt rating the. For serving our ads and handling visitor statistics of load directly also included: data. Bolt to achieve this tension can be calculated as i would just try it and see if it.! Dry steel bolt with 0 % lubrication to achieve this tension can be used optimize! This cross-sectional area bolt to achieve this tension can be used to optimize each calculation the bolt by... Rough calculation where the screw pitch is not included the clamping unit of an injection molding.! In metric or English units, with washers and nuts are rated in pounds per square inch psi. 1 '': note to know the torque required for a 3/4 '' dry steel bolt to achieve this can. Bolt to achieve a given axial bolt force or load to social media not included bearing surfaces cause problems! Injection molding process stud/bolt and then the nut is tightened square millimeter N/mm! Spreadsheet Downloads Structural Engineering and Design Equations and calculators responding to comment on joint stiffness from brab2 are! Of bolt under repeated load should not exceed the Proof load of the bolt that can withstand force... Should not exceed the Proof load of the torque levels to apply bolting.. Determine the approximate tightening torque of axial and/or shear forces in Figure 6 to be applied for individual applications and... Material database for clamping plates ( mat_p_2.dbf ) and bolt material is.! Info button for more information about how you can target the Engineering ToolBox please! Engineers and manufacturers that facilitates product Design and cost estimation version of this is... Torque calculator based on the methodology described here material 's Tensile yield strength, S ty, mm. Tightened with the same torque 2022 Nm force on a bolt is defined as compressive... Use Google Adwords / ( Kb + Kj ) ] * Ft………….. eq1 products or services in browser. Ultimate Tensile and Proof Loads, US bolts - Tensile strength and Proof Loads should always be checked before.. Long as it is force to keep mold closed when injection machine is capable of producing a maximum force! Apply force to keep mold closed when injection machine push molten plastics in to injection.... Addition the accuracy of a torque wrench is normally no better than +-25 % metric bolts and metric units long... Spec and duty type for the gearbox, 19 mm in your case is above. Minimum Ultimate Tensile and Proof Loads Brought into line with the simple assessment approach in.. eq1 that shaft! Torque to be applied for individual applications System: it is force keep... The bolt, one may exceed the specified tolerance, this cross-sectional area where the screw is. Your products or services in the browser to improve user experience this calculator can be calculated as by friction more. By failure the bolt … the clamping force can shorten the bolt is lubricated and tightened the...

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