friction clutches - Arten Freios e Embreagens Industriais

Table of Contents◗TENSION CONTROL CLUTCHES1. Fill in data for Roll Diameter, Web Speed,Web Width and Tension (See chart onpage 75 for suggested tension levels forvarious materials).2. If tension is given as pounds per mil per inch,( as newtons per micron per mm,) then webthickness is also required data.3. Calculate maximum and minimum web tension(T w max and t w min).4. Calculate Torque Requirement maximumWeb ProductsTECHNICAL EVALUATION FOR CLUTCHES◗ GENERAL SELECTION CALCULATIONS IMPERIAL SYSTEM (METRIC SYSTEM) ◗ CLUTCH SELECTIONand minimum. (Calculate Web Power,Total Power and Thermal Power.)5. Some tension control systems feature a tapertension circuit to reduce tension as windup roll size increases. Calculate and usemaximum taper torque as a substitute formaximum torque when using these systems.6. Calculate Belted RPM.7. Calculate Web Horsepower (Power),Total Horsepower (Power) andThermal Horsepower (Power).(Refer to torque and horsepower charts onpages 74 and 77.)1. Clutch must dissipate thermal horsepower(Power) at Belted RPM.2. Clutch must be able to rotate at Belted RPM.3. Clutch must deliver both the maximum andminimum torque within its normal control range.◗ CLUTCH SELECTION DATA IMPERIAL SYSTEM (METRIC SYSTEM)Roll Diameter Web Width Web ThicknessMax._________ in. (_________ mm) (D) Max. _________ in. (_________ mm) (W) Max. _________ Mils (M) (_________ Micron) (µ)Min. _________ in. (_________ mm) (d) Min.__________ in. (_________ mm) (w) Min. _________ Mils (m) (_________ Micron) (µ)Web Speed Tension Data ClutchesMax._______ FPM (_______ mpm) (V) Max.____________ T ❏ total ❏ pli (N/mm) ❏ lb/mil/in (N/µ/mm) (T) _______ % TaperMin. _______ FPM (_______ mpm) (v) Min. ____________ t ❏ total ❏ pli (N/mm) ❏ lb/mil/in (N/µ/mm) (t) _______ % TaperWeb Tension (T W ) Calculation:Brake Torque Requirement (τ)If tension (T) is given as: τMax = T W Max x D ÷2Total Tension; T W = T = _______________ lb (N)t w = t = _______________ lb (N)__________ x __________ ÷ 2 = _____________ inch lbs.τMax = T W Max x D ÷(2000)__________ x __________ ÷ 2 = ______________ (Nm)τMin. = t w Min x d ÷ 2PLI (N/mm); T W = W x T = _______________ lb (N) __________ x __________ ÷ 2 = ______________ inch lbs.t w = w x t = _______________ lb (N)τMin. = t w Min x d ÷ (2000)Lb/mil/in; T W = W x M x T = _______________ lb __________ x __________ ÷ 2 = ______________ (Nm)t w = w x m x t = _______________ lbN/µ/mm; T W = W x µ x T = _______________ (N)Maximum Taper TorqueτMaxt = τMax (1– % taper )100t w = w x µ x t = _______________ (N) ___________ (1– __ ) = _____________ inch lbs. (Nm)Belted RPMV x 12 x 1.05d x π_______ x 12 x 1.05 = ____________RPMx 3.14or metricV x (1000) x 1.05d x π______ x (1000) x 1.05 = __________ RPMx 3.14Web Horsepower (HP w )T w Max x V33000__ x __ = ____________HP w33000or metricWeb Power (kW)T w Max x V(6000)___ x __ = (kW)____________(6000)Total Horsepower (HP)(Total Power)HP w (HP) x D x 1.05d___ x ___ x 1.05 = ___________ HP(kW)Thermal Horsepower (HP t )(Thermal Power (kW))HP-HP w__ – __ = ________ HP t_ ________(kW)◗ NEXEN ENGINEERING SERVICEFax or e-mail to your Nexen Applications Engineer (Numbers listed on back cover of catalog)Name _______________________________________ Title: __________ Date: __________ Phone: (_____)______________ Ext: ________78Company: _____________________________________________________Address: ______________________________________________________Fax or e-mail: _____________________________________________City:_____________________State: _____ Zip Code ___________