![]() Also, the outside radius of the bend is more prone to cracking when bending parallel to the grain direction. Bending “across” or “traverse” to the grain is when the bend line runs perpendicular to the grain, which makes for a stronger bend that’s less likely to crack (see Figure 2).īending parallel to the grain will create a weaker bend than a bend line running against or transverse to the grain. In previous articles, I’ve used “bending with the grain” when the bend line is parallel to the grain direction, as shown in Figure 1. Now, back to the subject at hand: the grain direction’s relationship to the bend line. Nonetheless, when everyone is using the language correctly-well, you get the picture. These are only a few relevant definitions there are more. Neutral axis: The theoretical area within the material at the bend that is neither expanded nor compressed. ![]() ![]() Bend deduction The value that is subtracted from the total of the outside dimensions to determine the flat length of a part. Bend allowance: The length of the neutral axis, which can be added to the setbacks to determine the flat length of a part. Outside setback, or setback: The distance from the tangent point of the flat and the radius to the apex of the bend. Here are a few you could include: k-factor: A multiplier value to determine the location of the relocated neutral axis. To get everyone on the same page and using the terminology correctly, I recommend posting a simple laminated wall chart or handout with all the relevant definitions. Terminology misuse is often brutal to correct, and everyone will give the same response as to why they use the terms the way they do: because that’s how I learned it. Because these terms have exact meanings and applications, misusing them makes communicating complex ideas complicated and creating quality parts much harder to accomplish. One person’s bend allowance cannot be another person’s k-factor, and a k-factor is not a bend deduction-though I visit shops where this is precisely the case. Very few trade-specific terms are interchangeable. This statement is true whether you are learning in the classroom or discussing a project on the job. Confusion over verbiage is one of the biggest problems our industry faces. Any further guidance on this topic would be much appreciated.Īnswer: Before I delve further into this topic, I would like to begin with your comment about verbiage. Note also that this is an offset bend that will be made in a coil-fed stamping press, not a press brake, but I assume at least some of the metal forming fundamentals apply. I’m not crazy about this idea, but I think it will be OK. I was researching the topic because we are bending 0.060-in.-thick 3003 H14 aluminum (see Figure 1), and my toolmaker wants me to design the bends parallel to the grain, because the tool will be easier for him to work on. Does this mean the grain runs perpendicular or parallel to the bend line? Question: A previous article of yours suggests that forming “with” the grain direction will manifest cracks. If press brake operators bend a small radius with the material grain-that is, the bend line runs parallel to the material grain direction, they should watch out for cracking.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |