Inventor uses a kfactor for calculating bend allowances. The k factor is the most important and elusive variable of bending, because it varies both as a function of the material and according to parameters such as angle and tooling. The most important consideration when bending metal on a. You can find the first article in this series by clicking here of all the mathematical constants in precision sheet metal fabrication, the kfactor stands out. From there we can calculate the kfactor and the bend deduction. Hence the value of the k factor is different for the different materials, inside bend radius, method of forming and different thickness.
Youll also learn how to use tedcf publishings kfactor. A kfactor is a percentage multiplier for locating the neutral axis. Calculate k factor, bend allowance and y factor for sheet metal bending. It ultimately allows you to estimate the amount of stretch without knowing what type of material you are bending. I know nothing more about this, or even if this is the calculation you are looking for. The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t, i. Then under bend allowance section select this new custom made table. For that reason, its likely to effectively give at the inside bend radius or the outside radius and not anywhere in between. It is a kfactor calculator developed by the new zealand company knac solutions. This is the second part of a series covering the variables that affect the kfactor value in bending. Download the files the instructor uses to teach the course.
Typically the kfactor is going to be between 0 and. Learn about the different options available in solidworks for calculating a sheet metal flat pattern and what these different options mean. Take a rectangular blank of the material, whose k factor is to be calculated. I had a question on kfactors for our 3d modeling software. This movie is locked and only viewable to loggedin members. The bend allowancebend deduction of the sheet metal specified in kfactor by configuring and utilizing a sheet metal gauge table, we can speed up the process of selecting the correct wall thickness based on gauge value and selecting. Lets start with 90 degrees bend which is the most simple scenario. Oh, and yes, you do need to know the kfactor to calculate the bend allowance. You can directly use our bend allowance calculator to calculate the bending allowance. Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness. Kfactors, yfactors, and press brake bending precision. The following equation relates the kfactor to the bend allowance. Bend the sheet to 90 degrees and measure length a and b.
Plus bend also allows you to calculate the k factor of a new material by using the k factor wizard tool. Automatically calculate bend deduction, bend allowance and kfactor for sheet metal fabrication and forming. The most important consideration when bending metal on a brake is the minimum bend radius. In this article we will discuss sheetmetal bend deduction, bend allowance, kfactor, yfactor and sheet metal flat pattern calculations. All sheet metal workers know the importance of an accurate kfactor or bend allowance when it comes to design. The mold line lengths are the distances measured to the outside mold line and are equal to the flange lengths plus the setback.
Kfactor calculation calculating new k factor for a material. The bending tool has a radius of 30 mm which means that our inside bend radius r is 30 mm. Find out how much tonnage will be required for a specific bend taking into account bend method air bending, coining, etc and vwidth, etc. Calculating bend allowance, bend deduction, and kfactor. Calculate k factor, bend allowance and y factor for sheet. Kfactor value input in proe yes proe also has this capability, in sheet metal file go to, file prepare model properties, under sheetmetal section, click change on bend allowance, the rest of the things you can explore i guess. Take a rectangular blank of the material, whose kfactor is to be calculated. How to create a custom solidworks sheet metal bend table. Take advantage of trumpfs expertise as a leading innovator when it comes to bending sheet metal. How to calculate bend allowance for your press brake. After bending the sheet we need to do some measurements as shown in figure 2. The online free fabrication calculator will help you calculate the kfactor, yfactor, bend allowance, bend deduction, flat size, neutral axis, arc length etc. With this free online tool we quickly get the sheet metal bend deduction, and therefore the sheet metal blank initial flat length, from the finished part measurements you only have to insert interior angle, flange lengths, k factor, inside radius, and material thickness. Cut a sample sheet and measure its total flat length and sheet thickness in mm.
Since the kfactor is based on the property of the metal and its thickness there is no simple way to calculate it ahead of the first bend. Kfactor calculator for sheet metal bending smlease design. How to use this kfactor calculator in sheet metal reverse engineering approach step1. Below is our simple bend allowance calculator, it works by inputing the material thickness, bend angle, inside radius and kfactor. Input material thickness and and inner radius to get the data of k factor, y factor, neutral layer. Bending calculations using kfactor, bend deduction, and bend allowance. The theory is that somewhere thru the thickness is a neutral pointsheet where the flat and folded lengths are the same. Bend allowance calculator tells you the amount of metal to add. How to use this k factor calculator in sheet metal reverse engineering approach step1. We have a part that has multiple bend radius and different bend deductions but our flat pattern is coming out small. Sheet metal bend allowance calculator determines the bend allowance amount of metal to be added to the total layout when forming sheet metal. It simply processes these variables through the equations we will discuss below. They will put the k factor in the controller and measure the air flow from the diffuser. Response to question concerning kfactors by material type and forming method.
About us linkedin learning about us careers press center become an instructor. The kfactor for a new material can be calculated on the shop floor. In sheet metal, there is a powerful bend constant known as the kfactor. If not they would be changing up or down the correction. The program is very simple and user friendly and requires no previous knowledge. The application allows to calculate the length of a work piece for bending of metal sheets or stripes, round or square bars and round tubes.
Hence the value of the kfactor is different for the different materials, inside bend radius, method of forming and different thickness. The solidworks application also comes with a kfactor bend table in microsoft excel format. Use the known kfactor and the known inner bending radius to. Bend allowance is the amount of metal to be added to the total layout. The new trumpf bendguide app enables you to perform bending calculations more easily and clearly than ever before. Easily calculate the kfactor to be used in your 3d design software. Although you may find several different formulas that claim to calculate the bend allowance see bending definitions, they usually are the same formula, only simplified by filling in the angle or a kfactor. Bending calculations using kfactor, bend deduction, and. If this is the correct formula, this should be fairly straightforward to put into. Reverse engineer the kfactor from your own shop validated data. Plus bend also allows you to calculate the kfactor of a new material by using the kfactor wizard tool. Most sheet metal materials will conform to the calculations.
Bend plus kfactor download faq kfactor calculator the program is used to calculate the kfactor in sheetmetal bending. Find useful tonnage calculator tools to calculate press brake tonnage, metal punching tonnage and steel bend allowance calculator tools. Solidworks sheet metal tools are relatively straight forward, but may not be clearly understood. Then input the bend angle to get the arc length, bend allowance and bend deduction. Follow along and learn by watching, listening and practicing. The kfactor depends on many factors including the material, the type of bending operation coining, bottoming, airbending, etc. You may be wondering what exactly is bend allowance if youve never worked with sheet metal before. Kfactor depend on material, bend radius, bend angle. You can use a k factor chart to collect the value of k factor for the given case. The kfactor is the ratio of the neutral axis location t to the material thickness mt. They should get the same result at a differential pressure of 1 in w.
Kfactor is a ratio that represents the location of the neutral sheet with respect to the thickness of the sheet metal part. Or give them final product and let them work out allowances. Online bend deduction calculator microform precision. This lesson talks about stressed and compressed material within a sheet metal bend and how kfactors are added to the style library. The k factor for a new material can be calculated on the shop floor. When you bend sheet metal, the neutral axis shifts toward the inside surface of the bend.
Please note the bending of sample part is done in the same manner as we are planning for production. Online calculator of sheet metal bend deduction and flat. Sheet bending calculator for android free download and. Then input leg length a and b to get the flat size of the sheet. Kfactor calculation calculating new kfactor for a material. Just copy and paste the below code to your webpage where you want to display this calculator. Kfactor calculator easy and effective solidworks forums.
Sheet metal mechanic is a quick and easy bend deduction calculator. The problem with a solidworks sheet metal bend table is that it can only control the bend allowance, bend deduction or kfactor but the thickness and radius is still free to be changed manually. It is used to calculate sheet metal flat length flatpattern. Besides, the fabrication calculator can also help you calculate kfactor, yfactor, bend allowance, bend deduction, etc. The values of the setback, bend allowance, and bend deduction can be calculated from the sheet thickness, bend radius, bend angle, and k factor. That translate to a kfactor of either 0 or 1, so just average it out and call it a. The values of the setback, bend allowance, and bend deduction can be calculated from the sheet thickness, bend radius, bend angle, and kfactor. How to set up sheet metal gauge tables engineers rule. Bendworks is a simple calculator to help you calculate bend deductions, and to help you reverse engineer the best kfactor to use when creating sheetmetal parts in. I came across a community sponsored application that will aid any sheet metal designer. When you select kfactor as the bend allowance, you can specify a kfactor bend table. In order to find the kfactor you will need to bend a sample piece and deduce the bend allowance.
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