It ultimately allows you to estimate the amount of stretch without knowing what type of material you are bending. Bend the sheet to 90 degrees and measure length a and b. K factor is actually the ratio of the offset t of the neutral axis from the inside bend and the thickness of the sheet t when a piece of sheet metal is bent. The location of this line is often referred to as the k factor. Powder coating is a commonly used surface finishing technique. I dont care about possibility to make falt pattern. China sheet metal, sheet metal manufacturers, suppliers. Using a variety of y and k factor bend allowance calculations. It is used to calculate sheet metal flat length flatpattern.
Sheet metal is a thin, flat piece of metal formed during an industrial process that is used for many everyday applications. In the drive selection tables, the adjusted power rating is presen. Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness. Sheet metal is one of the fundamental forms used in metalworking, and it can be cut and bent into a variety of shapes. How to create a custom solidworks sheet metal bend table.
You just have to enter a value for the thickness of materials and bending radius, in. Determining the kfactor for sheet metal cr4 discussion. Can anyone tell me how do we generally locate our neural axis. This will give a set of surfaces placed on the neutral axis. Typically the kfactor is going to be between 0 and. In sheet metal, there is a powerful bend constant known as the kfactor. With this free online tool you can calculate the k factor, a fundamental parameter used to calculate sheet metal elongation according to your bending setting. The kfactor approximations given below are more likely to be accurate for air bending. Chapter layout and fabrication of sheet metal and. When a metal sheet is bent with a press break, its material is deformed, which is the reason of the difference in overall length of a. K factor is used in defining the bend allowance, thus by using bend allowance tables it is possible to automatically set the kfactor for defined materials see gauge tables. Our solidworks experts can setup your environment so that your team uses a comprehensive set of. Metalworkers work more than a dozen types of processes to form sheet metal into usable pieces for these applications. The formula according to which developed length is calculated is.
The k factor is the ratio of the neutral axis location t to the material thickness mt. Bending a known length of sheet metal is easy, but to calculate the bend. You then unfold these surfaces to get your flattened part. I came across a community sponsored application that will aid any sheet metal designer. Change k factor fro sheet metal design dear all if some one know how to change the k factor in sheet metal branch, int this branch you can adjust the k factor from00. When creating sheet metal assemblies multi sheet metal parts, does anyone else have an issue with parts having a different kfactor even though they are the same makeup foe all, but they have different flanges,hems, and such. When you select kfactor as the bend allowance, you can specify a kfactor bend table. Pdf bend allowance constants for use in sheet metal forming. The line where the transition from compression to stretching occurs is called the neutral axis. 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. Response to question concerning kfactors by material type and forming method. Short video tutorial of sheetmetal extrude feature sheetmetal from scratch. Kfactor elo rating system, a constant used in elo rating system kfactor marketing, the growth rate of websites, apps, or a customer base kfactor sheet metal, the ratio of location of the neutral line to the material thickness the k factor, a fictional tv show within harry hills tv burp. If the crosshead speed, v, is suddenly changed by a factor of 10 or more.
In sheet metal design, the kfactor is used to calculate how much sheet metal one needs to leave for the bend in order to achieve particular final dimensions, especially for between the straight sides next the bend. The k factor in sheet metal is the ratio of thickness to the location of the neutral line in the metal cross section. K factor the parameter describes the distance from the neutral line to the inner surface. T t kfactor t t the only truly effective way of working out the correct bend allowance is to reverse. How to set up sheet metal gauge tables engineers rule.
This chapter introduces you to basic sheet metal and fiberglass ductwork fabrication. Now lets see how we can obtain these values for a specific sheet. Calculating bend allowance, bend deduction, and kfactor. Since the inside compression can not exceed the outside tension, the k factor can never exceed. The yfactor is used, as far as i know, solely by ptcs proengineer, now known as creo elementspro. Change k factor fro sheet metal design 3dcadforums. We use solidworks to model these parts currently but have started migrating to v5.
Kfactor bricsys support and help center bricscad help center. Introduction to cad and cam for metal sheet processing. Most sheet metal shops will produce their own bend tables by physically bending test pieces to specified angles and taking accurate. Bending is a manufacturing process that produces a vshape, ushape, or channel shape. Analyzing the kfactor in sheet metal bending the fabricator. The bend deduction is the amount the sheet metal will stretch when bent as measured from. 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. Sheet metal is metal formed by an industrial process into thin, flat pieces. Line in the metal that is neither compressed nor stretched with in the thickness is called as neutral axis. The kfactor is a physical value defining the ratio of distance from the inner side of the bend to. Sheet metal basics sheet metal interview questions for. The tolerances in the table and attachments reflect current manufacturing practices and commercial standards and are not representative of the manufacturers standard gauge, which has no inherent tolerances. Cut a sample sheet and measure its total flat length and sheet thickness in mm.
Mark, nice find on the video, its a good explanation. When the blank is first being bent, the neutral axis is near the center of the sheet thickness. When working in solidworks to create sheet metal designs, we will often need to know three important values. Let me make it clear that it is a very important term used in sheet metal design. Its not always neccessary that our neural axis lies at the middle of the sheet. Therefore, it will be important to have a design that. Standard kfactors can be found from your sheet metal supplier, online, or through real world testing. All sheet metal workers know the importance of an accurate kfactor or bend allowance when it comes to design. Mathematically k factor is equal to position of neutral axis divided by sheet thickness. Nc state university sheet metalworking terminology. Kfactor is where the neutral axis is situated in the bend. Use the known kfactor and the known inner bending radius to. The program is very simple and user friendly and requires no previous knowledge.
In this article we will discuss sheetmetal bend deduction, bend allowance, k factor, y factor and sheet metal flat pattern calculations. Kfactor is a ratio that represents the location of the neutral sheet with respect to the thickness of the sheet metal part. A kfactor is a percentage multiplier for locating the neutral axis. It is a kfactor calculator developed by the new zealand company knac solutions. In order to find the kfactor you will need to bend a sample piece and deduce the bend allowance. Calculate k factor, bend allowance and y factor for sheet metal. What are all the surface finish processes used for sheet metal fabrication. Air bending is inherently sensitive to variations in sheet thickness and materia. The program is used to calculate the kfactor in sheetmetal bending. As i mentioned in my last post you need to do some tests to calculate these values for a specific sheet. This book makes possible the accurate geometrical solution of all problems of pattern development normally encountered, by giving examples arranged according to a systematic plan which progressively illustrates the underlying principles.
I had a question on k factors for our 3d modeling software. The yfactor is simply a variable based of the more commonly used kfactor. Kfactor is a ratio that represents the location of the neutral line with respect to the thickness of the sheet metal. The better the roux goes with all the ingredientsmaterial type, thickness, and grain direction. Relationship between bend deduction, bend allowance, and k factor. I have idea to use sheet metal to avoid bend part option in standard modeling please imagine that i have curve which consists of 10 arcs, then i need to make 10 bending operations to get the wished shapethat is the reason why i am trying with sheet metals, but kfactor makes a problems with material extension. This video to describe setting of k factor in creo and how to change developed length of sheet metal parts. Kfactor is an important parameter in sheet metal design. Tanel another option that is not so close to the theory of this pdf but you will help a lot the guys on the bending machine is the following. Unfold your sheet metal part and by adjusting the kfactor try to bring your bending line in a desirable distance. When you bend sheet metal, the neutral axis shifts toward the inside surface of the bend. Sheet metal k factor user modification manual overrides is an acceptable solution, provided the variables are still present k factor, corner notching, etc. The solidworks application also comes with a kfactor bend table in microsoft excel format. How to use this k factor calculator in sheet metal reverse engineering approach step1.
Kfactors, yfactors, and press brake bending precision. When metal is bent the top section is going to undergo compression. Computerized design of metal sheet parts in the solidworks environment. The kfactor in sheet metal working is the ratio of the neutral axis to the material thickness. It ultimately allows you to estimate the amount of stretch without. China sheet metal manufacturers select 2020 high quality sheet metal products in best price from certified chinese metal part manufacturers, carbon steel. Computer aided technology 165 n arlington heights rd ste 101 buffalo grove, il 60089 888 3082284 contact us. In my previous post i talked about k factor, bend allowance and bend deduction and what they mean in sheet metal design. It is derived by taking half of the kfactor multiplied by pi.
Autodesk inventor kfactor sheet metal cadline community. I trying to find an easier way to either have my template files set or. Shows up in the property manger of the sheet metal feature in the sheet metal gauges group box, under the table name. Now, you may be thinking, where this k factor is used. In sheet metal, there is a powerful bend constant known as the k factor. Best way to calculate k factor is to do a simple experiment by cu. For digital prototypes to be most effective, what we produce digitally in the form of models and drawings needs to represent the finished product as closely as possible. Since gauge tables were introduced, all the parameters can be controlled base on the drop down selection which makes life much easier. Determining the kfactor for sheet metal 12052008 9.
Plate metalwork is the manipulation of metal plate over 3. 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. During the rolling process the rollers bow slightly, which results in the sheet metal being thinner on the edges. Please note the bending of sample part is done in the same manner as we are planning for production. Some critical dimensions that need to be considered when setting up sheet metal in cad software are sheet metal thickness, the kfactor and bend radius. Pdf on jul 4, 2007, achilles vairis and others published bend. In reality, how a real metal part will stretch as it bends depends on a number of physical factors tooling, material homogeneity etc. It is our standard practice to lay out our composite cutandfold panels using the using the sheet metal feature with the k factor set to. You will be introduced to the tools needed to work the sheet metal. Value of k factor depends on material, sheet thickness, inside bend radius and machine used. Solidworks sheet metal tools are relatively straight forward, but may not be clearly understood.
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