What are all the surface finish processes used for sheet metal fabrication. Calculating bend allowance, bend deduction, and kfactor. China sheet metal, sheet metal manufacturers, suppliers. 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. The k factor in sheet metal is the ratio of thickness to the location of the neutral line in the metal cross section. Value of k factor depends on material, sheet thickness, inside bend radius and machine used. Air bending is inherently sensitive to variations in sheet thickness and materia. Line in the metal that is neither compressed nor stretched with in the thickness is called as neutral axis. Introduction to cad and cam for metal sheet processing.
Analyzing the kfactor in sheet metal bending the fabricator. K factor the parameter describes the distance from the neutral line to the inner surface. 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. Use the known kfactor and the known inner bending radius to. Determining the kfactor for sheet metal cr4 discussion. How to use this k factor calculator in sheet metal reverse engineering approach step1. The kfactor approximations given below are more likely to be accurate for air bending. The program is used to calculate the kfactor in sheetmetal bending.
Its not always neccessary that our neural axis lies at the middle of the sheet. 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. Bend the sheet to 90 degrees and measure length a and b. Our solidworks experts can setup your environment so that your team uses a comprehensive set of. In the drive selection tables, the adjusted power rating is presen. When you bend sheet metal, the neutral axis shifts toward the inside surface of the bend. Sheet metal is metal formed by an industrial process into thin, flat pieces. Kfactors, yfactors, and press brake bending precision. 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.
In order to find the kfactor you will need to bend a sample piece and deduce the bend allowance. You then unfold these surfaces to get your flattened part. When you select kfactor as the bend allowance, you can specify a kfactor bend table. Short video tutorial of sheetmetal extrude feature sheetmetal from scratch. Bending a known length of sheet metal is easy, but to calculate the bend. The kfactor in sheet metal working is the ratio of the neutral axis to the material thickness. Using a variety of y and k factor bend allowance calculations. 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 yfactor is used, as far as i know, solely by ptcs proengineer, now known as creo elementspro. Bending is a manufacturing process that produces a vshape, ushape, or channel shape. This will give a set of surfaces placed on the neutral axis. The solidworks application also comes with a kfactor bend table in microsoft excel format. When the blank is first being bent, the neutral axis is near the center of the sheet thickness. Standard kfactors can be found from your sheet metal supplier, online, or through real world testing.
Relationship between bend deduction, bend allowance, and k factor. Most sheet metal shops will produce their own bend tables by physically bending test pieces to specified angles and taking accurate. Now lets see how we can obtain these values for a specific sheet. Sheet metal k factor user modification manual overrides is an acceptable solution, provided the variables are still present k factor, corner notching, etc. 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. 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. All sheet metal workers know the importance of an accurate kfactor or bend allowance when it comes to design. The k factor is the ratio of the neutral axis location t to the material thickness mt. Metalworkers work more than a dozen types of processes to form sheet metal into usable pieces for these applications. Let me make it clear that it is a very important term used in sheet metal design. I came across a community sponsored application that will aid any sheet metal designer.
It ultimately allows you to estimate the amount of stretch without. Can anyone tell me how do we generally locate our neural axis. Kfactor is a ratio that represents the location of the neutral sheet with respect to the thickness of the sheet metal part. Description of the book the geometry of sheet metal work. Powder coating is a commonly used surface finishing technique. The better the roux goes with all the ingredientsmaterial type, thickness, and grain direction.
In sheet metal, there is a powerful bend constant known as the k factor. Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness. We use solidworks to model these parts currently but have started migrating to v5. During the rolling process the rollers bow slightly, which results in the sheet metal being thinner on the edges. Typically the kfactor is going to be between 0 and.
Countless everyday objects are fabricated from sheet metal. Best way to calculate k factor is to do a simple experiment by cu. How to set up sheet metal gauge tables engineers rule. Shows up in the property manger of the sheet metal feature in the sheet metal gauges group box, under the table name. 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. Please note the bending of sample part is done in the same manner as we are planning for production. Kfactor is an important parameter in sheet metal design. 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. 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. Autodesk inventor kfactor sheet metal cadline community. Unfold your sheet metal part and by adjusting the kfactor try to bring your bending line in a desirable distance. The line where the transition from compression to stretching occurs is called the neutral axis. 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.
It is derived by taking half of the kfactor multiplied by pi. 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 yfactor is simply a variable based of the more commonly used kfactor. Kfactor calculator for sheet metal bending smlease design. How to create a custom solidworks sheet metal bend table. Now, you may be thinking, where this k factor is used. Pdf bend allowance constants for use in sheet metal forming. This chapter introduces you to basic sheet metal and fiberglass ductwork fabrication. The program is very simple and user friendly and requires no previous knowledge. Plate metalwork is the manipulation of metal plate over 3. T t kfactor t t the only truly effective way of working out the correct bend allowance is to reverse. Chapter layout and fabrication of sheet metal and.
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. Calculate k factor, bend allowance and y factor for sheet metal. When metal is bent the top section is going to undergo compression. Pdf on jul 4, 2007, achilles vairis and others published bend. Computer aided technology 165 n arlington heights rd ste 101 buffalo grove, il 60089 888 3082284 contact us. Kfactor is where the neutral axis is situated in the bend. In my previous post i talked about k factor, bend allowance and bend deduction and what they mean in sheet metal design. Kfactor bricsys support and help center bricscad help center. In reality, how a real metal part will stretch as it bends depends on a number of physical factors tooling, material homogeneity etc. If the crosshead speed, v, is suddenly changed by a factor of 10 or more. Sheet metal is one of the fundamental forms used in metalworking, and it can be cut and bent into a variety of shapes. Determining the kfactor for sheet metal 12052008 9.
Mathematically k factor is equal to position of neutral axis divided by sheet thickness. When working in solidworks to create sheet metal designs, we will often need to know three important values. I trying to find an easier way to either have my template files set or. Computerized design of metal sheet parts in the solidworks environment. This video to describe setting of k factor in creo and how to change developed length of sheet metal parts. Solidworks sheet metal tools are relatively straight forward, but may not be clearly understood. Since gauge tables were introduced, all the parameters can be controlled base on the drop down selection which makes life much easier. Mark, nice find on the video, its a good explanation. You will be introduced to the tools needed to work the sheet metal.
I had a question on k factors for our 3d modeling software. The bend deduction is the amount the sheet metal will stretch when bent as measured from. 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. Kfactor is a ratio that represents the location of the neutral line with respect to the thickness of the sheet metal.
Sheet metal is a thin, flat piece of metal formed during an industrial process that is used for many everyday applications. 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. It is used to calculate sheet metal flat length flatpattern. China sheet metal manufacturers select 2020 high quality sheet metal products in best price from certified chinese metal part manufacturers, carbon steel. It ultimately allows you to estimate the amount of stretch without knowing what type of material you are bending.
The kfactor is a physical value defining the ratio of distance from the inner side of the bend to. In sheet metal, there is a powerful bend constant known as the kfactor. You just have to enter a value for the thickness of materials and bending radius, in. A kfactor is a percentage multiplier for locating the neutral axis. Nc state university sheet metalworking terminology. When metal is bent the top section is going to undergo compression and the bottom section will be stretched. 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. Since the inside compression can not exceed the outside tension, the k factor can never exceed. 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.
1178 621 869 932 1350 1344 1096 720 729 629 83 1102 1210 1158 1555 1577 1011 1179 262 155 802 629 265 563 733 855 468 139 421 678 1443 911 1172 726 228 510