10.07.2015 Views

friction clutches - Arten Freios e Embreagens Industriais

friction clutches - Arten Freios e Embreagens Industriais

friction clutches - Arten Freios e Embreagens Industriais

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Table of ContentsTechnical EvaluationWeb ProductsTECHNICAL EVALUATION FOR BRAKES◗ GENERAL SELECTION CALCULATIONS IMPERIAL SYSTEM (METRIC SYSTEM) ◗ BRAKE SELECTION1. Fill in data for Roll Diameter, Web Speed, 4. Calculate Torque Requirement maximumWeb Width and Tension (See chart on and minimum. (Calculate Web Power,page 220 for suggested tension levels for Total Power and Thermal Power.)various materials).5. Calculate Effective Cooling Speed2. 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).TENSION CONTROL BRAKES ◗(Refer to torque and horsepower charts onpage 217.)1. Brake must dissipate Maximum Horsepower(Power) at the Effective Cooling Speed.Use the cooling enhancement if needed.2. Brake must be able to rotate at maximum RPM.3. Brake must deliver both the maximum andminimum torque within its normal control range.◗ BRAKE 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 BrakesMax.______ FPM (_______ mpm) (V) Max._______ T ❏ total ❏ pli (N/mm) ❏ lb/mil/in (N/M/mm) (T) Normal Stop Time ____Sec.Min.______ FPM (_______ mpm) (v) Min. _______ t ❏ total ❏ pli (N/mm) ❏ lb/mil/in (N/M/mm) (t) Emergency Stop Time ____Sec.Web 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 = _______________ lbMaximum Brake Horsepower HP t (Power kW)N/µ/mm; T W = W x µ x T = _______________ (N)TW x V33000t w = w x µ x t = _______________ (N) __________ x __________ = _____________ HP tTW x V(60000)__________ x __________ = _____________ (kW)Maximum RPMV x 12d x π_______ x 12 = ____________ RPMx 3.14or metric V x (1000)d x π______ x (1000) = __________ RPMx 3.14Minimum RPMv x 12D x π_______ x 12 = ____________ RPMx 3.14or metric v x (1000)D x π______ x (1000) = __________ RPMx 3.14Effedtive Cooling SpeedMin. RPM +( Max. RPM – Min. RPM )3+(–3) = ________◗ NEXEN ENGINEERING SERVICEFax or e-mail to your Nexen Applications Engineer (Numbers listed on back cover of catalog)Name _______________________________________ Title: __________ Date: __________ Phone: (_____)______________ Ext: ________Company: _____________________________________________________Address: ______________________________________________________Fax or e-mail: _____________________________________________City:_____________________State: _____ Zip Code ___________221

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!