Sheet Metal Drawing Pdf [PORTABLE] Download

Sheet metal parts often require multiple manufacturing processes to produce correctly. Because of this added complexity sheet metal drawings can be particularly tricky to create. This article will focus on how to prepare accurate and easy to interpret sheet metal drawings so that your parts come out in spec every time. As a bonus, the best practices included in this article can help you establish a better working relationship with your manufacturers and reduce extra workload associated with translating an imperfect drawing into a fabricated component.

Sheet metal parts require a sequence of manufacturing processes to transition from raw stock material to finished part. The first step in design for manufacturability is to consider this sequence of manufacturing steps and the design constraints associated with each process. Consider a low volume computer enclosure component. If the intended flat pattern is waterjet cut and then bent using a CNC press brake, what does that imply in terms of edge to bend accuracy? How will that stack up across all bends in the part? If the part is powder coated what hole diameter ranges will be acceptable for final assembly? These considerations can only take place after process steps have been clearly thought through.

Sheet Metal Drawing Pdf Download

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Understand how grain direction must be aligned relative to bends (you will need to note this on your drawing). This is particularly important for stainless steel and some aluminum alloys with large material grain size. Large grain structure and the sheet rolling process can give the material anisotropic strength properties which can cause bends across short grains to fracture as compared to bends across long grains.

Bend allowances should not be an afterthought. All bend processes introduce material deformations that must be compensated for in flat pattern construction. The wikipedia page on bending gives a great primer on this topic. As a designer, you should understand that the K-factor for a particular bend-material combination is a roll-up of unknown error sources. This makes it difficult to predict initially. Often, manufacturers iterate bend parameters and flat patterns until each bend falls in spec in terms of dimensional accuracy and spring back. We will touch more on this in the File preparation and manufacturer collaboration section of this article, but just know that sharing correctly formatted 2D drawing and 3D file output can help facilitate this iterative process, resulting in potentially faster and better parts.

As we saw in our process map, sheet metal parts leverage different processes for different part features. Remember that this can set up tolerance dependencies between features. For example, a simple 90 degree bracket with holes in each face will have hole to bend tolerances dictated by the part profile tolerances.

Many factors impact the accuracy of sheet metal bends, but perhaps the largest impact is material variability. To explore this lets look at the sheet thickness variation of 12 gage steel. The minimum thickness is 0.0986 inches and the maximum thickness is 0.1106 inches. This thickness variation will impact the springback of the part after bending. By computing springback as a function of sheet thickness, you can see the large impact of material thickness variability on bending tolerances.

All drawings need orthographic views to represent 3D geometry generally. In addition to these views, it can be very helpful to include a 2D flat pattern drawing with reference dimensions. This can help your manufacturer consider how the parts will be laid out and nested on sheet stock and how many profiles they can cut per square foot of sheet. Just like providing part surface area to anodizing vendors, the 2D flat pattern can speed up quote turnaround time.

We write a lot about GD&T, and sheet metal is an area where I see people go wrong consistently. Before applying GD&T to sheet metal drawings, remember that sheet metal components are relatively compliant. This means they conform to the components they are assembled with. If you are specifying tight tolerances of form (straightness and flatness) or tolerances of orientation (parallelism, perpendicularity), first ask yourself, is this even necessary? In the assembled condition, will your tolerances make a meaningful difference to the as build geometry and functionality?

Because sheet metal components require multiple manufacturing processes, proper file preparation can speed up both the quoting and production processes. The first step is to speak with your manufacturers and learn what file formats they prefer for each process. This can reduce file conversion workload, which is often a source of mistakes (anyone who has received a 1:2 scaled down set of flat patterns will shudder when they read this).

I have run into a problem whereby the sheet metal flat pattern will not show in a flat pattern drawing view. This happens when I derive a sheet metal part from a solid then delete one of the faces of the derived solid to turn it into a surface. I know I can derive a surface directly but deriving to a solid allows me to modify the solid easily then turn it into a surface by deleting a face. I can then create my sheet metal part on the remaining faces.

This problem is not consistent. Some parts I create this way work out well and some do not. It only seems to affect the drawing view. The type of derived solid does not seem to matter - whether a single body with or without seams or as separate solid bodies. I suspect this has something to do with the Inventor software seeing the surface body as a solid body and therefore as a multibody part, which is not allowed in flat pattern drawing views.

I tried Rebuild All in 2018 but it did not work for me; however, when I opened the model in 2019 initially the behaviour is the same until I Rebuild All, then the flat pattern appears in the drawing view. We have not yet migrated to 2019 as a company (although we have a subscription for it) so this is the first I've been able to try it.

I would like to have a single drawing with both the flat and formed part on it. The first thing I tried was creating a simplified rep with the flat suppressed. When I go into the drawing, View States, simplified rep is greyed out and I can't select my rep with the flat suppressed. Another thing is that my assemblies were built before the flat and simplified reps were added so my assemblies blow up.

Flat patterns are always the last feature in a sheet metal part. I try to use unbend and bend back instead. If flattening forms is not required, I can use a bend back as a last feature and have a simplified rep for the flat part.

Create an instance and use that in your drawing by using "add model" After you create your flat you can create an instance by clicking on the drop down arrow next to it (just click through and use the defaults). The picture shows it greyed out because it is already done, The flat stays suprressed in the model. Much easier to use no bend/unbend or simplified reps. We always dedicate the last sheet for flat patterns, makes it easier to export as a .dxf to the programers.

I am pretty new to Fusion 360. I created a sheet metal object from flat dimensions adding folds as needed. I have viewed a few tutorials and I do not see "Flat Pattern" in the browser tree. I am trying to create a drawing and would like to show the item both as folded and unfolded. I have started the drawing with the object folded. I then unfold the object and try to add it into the same drawing. As soon as I do, I get a version mismatch. If I update the drawing, the drawings that I inserted of the 3d view now show as flat. How would I go about inserting both views into the one drawing?

Drawing is a manufacturing process that uses tensile forces to elongate metal, glass, or plastic. As the material is drawn (pulled), it stretches and becomes thinner, achieving a desired shape and thickness. Drawing is classified into two types: sheet metal drawing and wire, bar, and tube drawing. Sheet metal drawing is defined as a plastic deformation over a curved axis. For wire, bar, and tube drawing, the starting stock is drawn through a die to reduce its diameter and increase its length. Drawing is usually performed at room temperature, thus classified as a cold working process; however, drawing may also be performed at higher temperatures to hot work large wires, rods, or hollow tubes in order to reduce forces.[1][2]

Drawing differs from rolling in that pressure is not applied by the turning action of a mill but instead depends on force applied locally near the area of compression. This means the maximal drawing force is limited by the tensile strength of the material, a fact particularly evident when drawing thin wires.[3]

In sheet metal drawing, as a die forms a shape from a flat sheet of metal (the "blank"), the material is forced to move and conform to the die. The flow of material is controlled through pressure applied to the blank and lubrication applied to the die or the blank. If the form moves too easily, wrinkles will occur in the part. To correct this, more pressure or less lubrication is applied to the blank to limit the flow of material and cause the material to stretch or set thin. If too much pressure is applied, the part will become too thin and break. Drawing metal requires finding the correct balance between wrinkles and breaking to achieve a successful part.

Sheet metal drawing becomes deep drawing when the workpiece is longer than its diameter. It is common that the workpiece is also processed using other forming processes, such as piercing, ironing, necking, rolling, and beading. In shallow drawing, the depth of drawing is less than the smallest dimension of the hole. ff782bc1db