Sheet Metal Flat Pattern Layout

The flat pattern drawing doesn t always list these factors.

Sheet metal flat pattern layout.

Bend lines must be determined to develop a flat pattern for sheet metal forming. Enter k factor values. Use k factor calculator to calculate k factor values. Before a sheet metal part is formed make a flat pattern to show how much material is required in the bend areas at what point the sheet must be inserted into the forming tool or where bend lines are located.

The k factor is used to calculate flat patterns because it is related to how much material is stretched during bending. The layout may either be done on the material to be used or on a piece of paper. Enter flange length internal radius and thickness values. The value of the k factor should range between 0 0 5.

Bend allowance ba π 180 r k t a. Calculate the value bend allowance for required sheet metal bend by using below formula. Value of bend deduction and flat pattern are shown in result section. Here are the steps to be followed to calculate sheet metal flat length.

View the cone instructions below to learn how to manually layout the flat pattern for a truncated cone in single or multiple gore sections. Dimensions given on a flat pattern are affected by several bending factors like k factor and bend radius during the 3d modeling stage. Importance of the k factor in sheet metal design. Sheet metal flat length can be calculated in the following three simple steps.

Therefore it is important to have the value correct in cad software. However to match the other dimensions that are included it would require your manufacturer to work with incorrect or unachievable sheet metal forming factors. It allows you to determine either the size of raw material needed or the number of gore sections to fit on your available material.