Y AND K FACTOR
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SHOW NAVIGATION << >> About Y- and K-factors Y- and K-factors are part constants defined by the location of the sheet metal material's neutral bend line with respect to the thickness. The neutral bend line position is based on a numeric reference for the type of sheet metal material used in your design. The numeric references range from 0 to 1. If you are referring to the Y- and K-factors, the numeric references can be negative, with the lower numbers representing softer material. Both the Y- and K-factors are integral elements in calculating the developed length (the length of flat sheet metal required to make a bend of a specific radius and angle) in your design. However, the length of the neutral line is equal to the developed length. The K-factor is a ratio between the distance from the neutral bend line to the inside bend radius and the material thickness. The K-factor uses the formula k-factor = δ/T. Use the K-factor to determine the Y-factor. The Y-factor is a ratio between the neutral bend line and material thickness. The Y-factor uses the formula Y-factor = K-factor * (Π/2). The default value for the Y-factor is 0.50. Developed Length of Material and the Y- and K-Factors 1. Bend condition 2. Flat Condition Where: = Distance between the inside radius of the bend and the neutral bend line T = Sheet metal thickness L = Developed length between the squares R = Inside Bend radius N = Neutral bend line K-factor = δ/T Y-factor = K-factor * (Π/2)
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Y AND K FACTOR
Transcript of Y AND K FACTOR
Show Navigation > About Y- and K-factorsY- and K-factors are part constants defined by the location of the sheet metal material's neutral bend line with respect to the thickness. The neutral bend line position is based on a numeric reference for the type of sheet metal material used in your design. The numeric references range from 0 to 1. If you are referring to the Y- and K-factors, the numeric references can be negative, with the lower numbers representing softer material. Both the Y- and K-factors are integral elements in calculating the developed length (the length of flat sheet metal required to make a bend of a specific radius and angle) in your design. However, the length of the neutral line is equal to the developed length.The K-factor is a ratio between the distance from the neutral bend line to the inside bend radius and the material thickness. The K-factor uses the formula k-factor = /T.Use the K-factor to determine the Y-factor. The Y-factor is a ratio between the neutral bend line and material thickness. The Y-factor uses the formula Y-factor = K-factor * (/2). The default value for the Y-factor is 0.50. Developed Length of Material and the Y- and K-Factors
1. Bend condition2. Flat Condition
Where:= Distance between the inside radius of the bend and the neutral bend lineT = Sheet metal thicknessL = Developed length between the squares R = Inside Bend radiusN = Neutral bend line
K-factor = /TY-factor = K-factor * (/2)
You can change the Part Y-factor using any of the following: Set Up commandInitialize the Y-factor using the set up command. The new Y-factor value takes effect for any new parts or features created after the value is set. The default Y-factor value that is, 0.5 is used by all features in a part except for features that use user-defined Y- and K-factors. Material fileInitialize the Y-factor using the PTC_INITIAL_BEND_Y_FACTOR parameter in the Material Definition dialog box or Edit > Setup > Bend Allow > Y-factor. The default PTC_INITIAL_BEND_Y_FACTOR value in the material table is 0.5. The Y-factor is updated if you change the value in the material file assigned to the part. If you unassign a material file, the part is frozen with the Y-factor, K-factor, and bend table values that were assigned to the previous material file. Configuration optionInitialize the Y-factor for new sheet metal parts using the PTC_INITIAL_BEND_Y_FACTOR configuration option. After you reload the configuration file, all new sheet metal parts use the new value. The configuration option does not change the default value for the existing part's Y-factor. You can apply a feature-specific Y-factor to the geometry of the feature. You can select K- and Y-factors for non-arc segments and bend tables for arc segments. A flange profile can be an arc or any non-arc segment, or a combination of both. Note: For stretched bends is negative. As a result, the neutral layer stays out of the sheet metal thickness causing the Y- and K-factors to be negative.Negative Y-factor
Where:= Distance between the neutral bend line and the inside bend radiusT = Sheet metal thicknessL = Developed length between the squares R = Bend radiusN = Neutral bend line
