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      نویسنده نویسنده : تاریخ : تاریخ
      آموزش طراحی چرخ دنده در کتیا


      DESIGNING GEAR IN CATIA V5
      Author’s Note:
      This is step by step guide how to create gear using CATIA.
      I'm not CATIA expert. Someone might find that CATIA doesn't
      have much with TCP/IP and FreeBSD. I coulnd't find
      much about gear design using GOOGLE or YAHOO. Since I enjoy
      learing and practicing what I learn, I also enjoy sharing that
      with others (often seen on overnet/edonkey: please share :)
      don't be selfish. Here is step by step guide how to make spur gear
      using CATIA. Note that this was inspired by document I have
      found at website www.piovision.com (credits go to the unknown
      designer).
      But let's start. This document assumes that you have basic
      CATIA experience. Also, this document assumes that you know basic spur
      gear geometry. Here is excellent document from www.bostongear.com
      in case you are not familiar. Some basic notations:
      rb - base cylinder radius
      r - pitch circle radius
      rk - outside circle radius
      rf - root radius
      a - pressure angle (20deg)
      m - modulo (in our example 20) m=p/3.14159 where p is circular pitch
      2r=m*z
      z - number of teeth (in our example 20)
      When you start CATIA, go to TOOLS->OPTIONS->Infrastructure->
      Part Infrastructure and in Display select Paramteres and Relations.
      Then in Options->General in Parameters and Measures select With value
      and With formula in Parameters Tree View.
      Now it is time to go to Generative Shape Design:
      You will see something like:
      Bring Knowledge toolbar out:
      Then by clicking on arrow pointed down near table icon:
      Fog and f(x) are two most important things you will use for Gear
      Design:
      Now it is time to enter some basic parameters that define gear
      This is done by clicking at f(x) icon:
      And then when you see dialog box: Formulas: Part1
      fist select Parameter type (real, length or angle) click new
      Parameter of type and then edit value. You can do this until
      all parameters are entered.
      When you enter parameters it is time to enter some formulas.
      For, r, rb, rk and rf we enter formulas by naming them and by
      clicking Add Formula. Formula editor will appear:
      After typing all formulas and expanding specification tree you
      will see something like this:
      It is time to add laws that will define our involute. Click on fog
      icon, name law x add parameters, t and x select their
      types and add law:
      Same should be done for y. This law will help us to create
      points that define spline for our involute. Involute is line
      that is trajectory of point belonging to line that is always
      tangent to base gear cylinder. It is used for tooth profile.
      If gears had profiles formed by straight lines they wouldn't
      work.
      After expanding specification tree you should be able to
      see something like this:
      Now it is time to start creating our points for involute spline.
      Click on point icon, select xy plane for support and when asked
      to enter H and V cordinates right button click should bring menu
      where you should chose edit formula:
      You will be prompted by edit formula dialog. Type in: Relationsx
      .Evaluate(0)
      You should do same for V except you should use Relationsy
      .Evaluate(0). You will get starting point for involute:
      After repeating this step for .Evaluate(0.1)-.Evaluate(0.5) you will
      get this:
      Click on spline icon and chose all 6 points:
      Your involute is created! This is how it looks in sketcher:
      From this point everything is more or less simple.
      Create base cirle by clicking on cirle icon.
      Right click on radius and chose rb from formula editor:
      Now it is time to extrapolate our involute. For length also right click
      and chose formula (rb-rf)*1.5
      You can use View-> zoom and pan to see what actually you are doing.
      Create plane. Use formula: inv(360/z)/4. You will get -4.5deg angle
      offset from ZY plane.
      After this create rf circle and from insert menu use corner to create
      corner. Corner dialog will appear:
      This is what you should get:
      Now use trim and result should be:
      It is time for symmetry. Tooth starts to get shape:
      Create rk circle and use trims to get tooth shape:
      Circular pattern:
      First select tooth (trim.3) and then for reference element select Zaxis.
      Gear is almost done now it is time for joining all teeth:
      Turn off check manifold and check consistency:
      Apply one more trim and here is our gear in normal plane:
       


      برچسب ها: طراحي چرخ دنده هاي ساده و مخروطي در كتيا - آموزش نرم افزاركتيا براي ... , طراحی اصولی چرخدنده در کتیا - پرشین کتیا , مرجع آموزش تخصصی کتیا در کاشان , CATIA.IR :: تمرينات آموزشی کتیا CATIA , چرخدنده | مهندسی دانلود , مهندسی دانلود/عمران/ معماری/مکانیک/mohandesidl , Eng-Zamani.ir , پروژه اصول روشهای تولید چرخدنده - مکانیک (ساخت و تولید) ,
      نویسنده نویسنده : اماس تاریخ : 1392/04/29 تاریخ
      کد :2241

      تمام حقوق اين وب سايت و مطالب آن متعلق به http://mechanicengineeringdownload.parspa.com/ مي باشد

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