AutoCAD Inventor :: FEA Contacts On Threaded Connections?
Jun 18, 2013
I understand the process of splitting faces and applying a Bonded Contact between the split faces when you have a bolted connection with a nut, but what kind of contacts would you use for say a threaded connection?For example, suppose you have a plate that will be bolted to a mold. The plate has clearnace holes for said bolts and so that the bolts are threaded into the mold to be lifted. The plate has a threaded hole for the lifting mechanism (Swivel Hoist Ring). Finally, the desired load is applied to the Swivel Hoist Ring and the bolts are placed in pre-tension. I would like to simulate this via FEA but am getting tripped up in the contacts. Also I am trying to make it as simple and efficient as possible (by eliminating any bolts or other parts that are not needed). I use INV Pro 2014.
I have an 8" OD/5.523" ID steel tube. A 5.5" OD/4.957"ID tube is placed inside. The 8" and 5.5" tubes are placed over a 4.9375"OD shaft. So basically you have a hollow shaft attached to a drive shaft, with a filler tube placed between them to fill the gap. Two 1-1/2" UNC bolts are placed in matching1.531" diameter holes in every component (thru bolted) with a nut. Tightening the nut will tend to flatten the pipes, taking up the clearance between then and creating a contact pressure on the drive shaft. I have having trouble getting all of the contacts correct since the components are not in contact at the beginning of the simulation due to the radial clearances.
Two axial bolt loads of 129,000 lbs will be placed on the tubes. I have used a sliding/no separation contact between the bolt and nut. Then I put a fixed constraint on the bottom face of the nut (not in contact with the tube) and put a 129,000 force on the top of each bolt head to simulate the axial load created by the bolt preload. What type of contact should I use between the tubes that have radial clearance?
I have attached the tubes and drive shaft. The 1-1/2" bolts and nuts (both heavy hex) were found in the library.
When I setup my model for the FEA and hit Automatic Contacts, no contacts are detected .... You can see in the image I posted that Automatic Contacts is greyed out (once applied) and no Contacts are in the the Folder. I have ensured that my assembly contraints are valid and that they are indeed mated (face to face) - see image below. The Manual Contacts will work, but that kind of defeats the purpose of having the Automatic one. I have never altered any options or settings within the Simulation. I am using INV 2013 Pro. Most of the pieces in my assembly are 2x2x0.125 HSS (right out of CC).
Is there a way to tell Inventor to use the mean value for threaded holes? As it is IV always puts the Minor-min value for the hole size, which is a PITA for any and all CAM software.
The thread data can be extracted in CAM, but the hole size still remains what it's modeled as. I know I can edit the spreadsheet and cheat it, but that isn't exactly the correct way to go about it.
When I run an interference check on an assembly, any of the threaded holes that have fasteners in them shows interference. I guess that the problem arises from the document setting "Tapped Hole Diameter" is set to minor.
To solve the problem with the interference, I could either change the modeled size of the hole or change the modeled bolt diameter. Either one causes problems in other places.
I have a part I am trying add a threaded hole to. The option for threaded holes is unselectable. I tried editing the registry as past posts have said, but the "parts" folder doesnt show up in the registry. I have been through every folder in the registry and dont see anything that has to do with threaded holes.
We want to use dual dimensions for holes and figured out how to do this by editing the styles. This works great except for threaded holes the dual dimension is redundant as shown in the picture.
Is there a way to not have the dual dimension for threaded holes but keep them for other holes? Having a dual dimentsion for a metric thread or having it printed twice on the drawing is pointless.
how to make this Clamp Rod to Clamp Base Spacer Turn relationship.
this is from the Clamp Project on this site: Inventor Wizard, The Clamp Lever is turning or rotating the clamp rod into the Clamp Base Spacer but I could not simulate the Thread or the Screw motion if that is the term, or the 1 or 1/2 turn of the Clamp Rod to 1 Pitch movement, plus I can't seem to put the Rod inside the Clamp Base Spacer hole when the Contact Solver is ON, maybe modeling issue on my part.
I just did a Circular Pattern of a threaded holes to a second solid body. The hole came through but the thread did not?Right now I have SP1 installed. I have been using solid bodies for a long time now and have not seen this.
Here is the issue we have found. While sectioning a view of an assembly in idw, the threaded lines of threaded features have a strange behavior depending on the section line used. I have attached a simple example that shows what he have found. Basically, if the section line is straight, threaded features show correctely. Independent of section participation. If the section has segments at different angles, then lines are not appearing.
The first three views have both parts excluded from section participation(Obviously, there isn't any real life need for this, but I did it to just simplify the illustration without adding a bunch extra parts) The base view is the top view or view showing the round shape. For the first example at the bottom, i simply projected the view to the left and made sure "Threaded Features" was selected. Threaded lines show fine.
Second example is the similiar, except the i used a section view instead of the projected view. Both parts are excluded. Section line is straight. Verticle in this example. Doesn't have to vertical as the line is straight.
Next example is similiar to the second, only difference is the section is not straight. You can see the threaded lines do not show. This is the problem we want to solve. How to make the threaded lines display!!!
Last example shows the same section, only this time the component is included in the section participation. And it works.
Any settings to change or a trick to make it work. Otherwise, i think i need to issue a support request with autodesk.
In most cases threaded parts are designed without true surface (just cylinder with texture) thus part surface area is calculated wrong (less than it is i real world)).
any automatic way to get true value of threaded surface which is modeled in traditional (simplified) way?
I've got two pieces with 11/16" diameter holes for 5/8" bolts.
When I use Bolted Connection to place nut/bolt in the hole, it detects the 11/16" hole and sizes the bolt to look for 11/16" bolts. There aren't any 11/16" bolts so the window shows no bolts. I have to manually choose 5/8" for the bolt size in order to get a list of bolts to choose from. In my reading, i was thinking this was supposed to have been fixed by 2010, is that not correct?
Also, in testing another theory, after placing the bolted connection andt then editing the bolt size to 7/16" or 1 13/16" in diameter. The bolt doesn't update it's size to reflect the change in the hole. Is there really no correlation here? Is a manual change to existing bolts, nuts, washers, etc going to be necessary if the hole size changes? If i change the thickness of the plate(s) the bolt is going through, using autosolve updates the bolt length, but nothing seems to be checking the diameter of the hole.
If true, kinda harst to be able to make a completely parametric assembly of everything but the fastners.I'm using the Hole method on the bolt connection dialog with pre-existing holes that do not have threads on them.
When i try to make a bolted connection my "click to add fastener > standard/category" box is empty. my hole, which used hole command, is 11/16" and the bolt only needs to be roughly 2" long so im not demanding odd fasteners.
inventor 2014 Windows 7 Pro 64 i7-3820 3.6GHz 32 GB RAM 2 TB HD NVIDIA GeForce GTX 660 Ti Liquid Cooled 3D Connexion CM Storm twin ASUS LED
So I've got this part, and it's got bolted connections. There's two of them, and each one is a pattern of multiple #10 machine screws.
No matter what I do, one of them will always have a lighting bolt next to it, as shown in this picture:
Rebuild All doesn't fix it. Manually editing the bolted connection will fix the lightning bolt ... but it will invariably switch to the other bolted connection instead.
Also, another fun little thing I've found: if you grab one of the screws with the mouse and drag on it, only the first bolt in the pattern seems to be actually constrained to the hole. The others appear to have pretty much just distance constraints, maybe plane-axis constraints. You can rotate the whole pattern around the hole that the first bolt was set in. This doesn't seem like a good behavior to allow ...
Anyway, the data set for the above image is attached. The screws themselves aren't, but they're just content center parts and should get automatically generated if you open the assembly.
Product Design Suite Ultimate 2013, 2014 Autodesk Inventor 2013
We're new to using bolted connection in our piping systems. They work great within a pipeline, connecting flanged fittings, etc. Where we have an issue is across two pipelines. Each pipeline is a sub-assembly, so in the bolted connection wizard it is impossible to select the mating flange on the other sub-assembly as the termination plane for the bolted connection. I want the bolted connection to show up in the BOM for one or the other sub-assembly, not at the top level.
Right now what I am doing is manually inserting what would be the mating washer and nut, from the CC and using an offset Insert constraint to make it appear to sit on the face of the mating flange, then pattern that... and THEN run the bolted connection for the bolt and another washer on the other side. This works, but is very time consuming. How this could be done across sub-assemblies, with all of the parts in one sub-assembly's BOM?
Is this possible ?!! Ive been working in various CAD packages and have found this to be an issue every time. Say for instance you want to bolt through a wall onto a tapered flange, how can you select a non parallel face as the start or finish surface?
When a bolted connection is used, the bolt changes in length as the stackup of hardware increases and decreases. I have noticed that if I do not grab the red arrow to adjust the length, the amount the bolt extends past the nut
seems to be only about 2 threads. What is the formula Inventor uses to determine this extended length?
I'm currently creating a program to replace all fasteners in an assembly with there Metric / Imperial opposites. My program works and I've created a log file for any issues that do come up.
My question now is:
Is there any way to manipulate bolted connections through the API? Or is this not supported yet?
I cannot seem to find anything to do with them. It's strange though as my program creates an error log for the Lock Washers in the Bolted Connection (which it was struggling with previously anyways), but shows the other fasteners as being successful.
In my work i normally use our standard full threaded rods with square nuts. But, since we make the rods and nuts in the factory, they do not follow any international standard.
I wanted to add the threaded rods to the Bolted Connection menu in order to be able to automaticaly add the rod and to let inventor calculate the needed lenght.
I was able to add the rod to content center as an Ipart with all available sizes, but it doesn't appear on the bolted connections menu.
See attached our normal bolted connection, how can I add this to bolted connection so inventor will size it automatically to the needed lenght?
When deleting bolted connections from my assembly using design accelerator I am left with black cross hairs where the connections used to be, I can't seem to delete these from my model either in the assembly itself or by editing the sketch, what are these, why are they left over from a deleted connection and how do I remove them ... ? ?
Autodesk Inventor Professional 2013 SP2 64-Bit Edition Windows 7 HP Z400, Intel Xeon W3550 3.07GHz 12.0GB RAM, ATI FirePro V4800 (FireGL)
If there is a way to create multiple instances of bolted connections using design accelerator instead of having to add one by one which takes forever ? All the bolted connections are of the same specification.
I needed to create a lot of bolted connections so that my design could be sent for FEA analysis.Connections with thru holes eg. nuts and washers on the back work fine beyond the everpresent update issues.
My issue is with tapped holes, my parts already have the tapped holes but the "Botlted connection" feature insists on creating a new tapped hole for me. This is not so bad but every time I have to update for moved holes etc when updating the bolted connection I get a new tapped hole.Would really like to get rid of that tapped hole?
Also when I get the extra holes I delete the feature and then have problems with the underlying sketch which I cannot access, how do I get rid of that sketch or how do I access it?
We'd like our bolted connections to show up as assemblies in our parts list rather than individual parts.
We've modified our CABoltCon.Imperial.xml template to make the assemblies B.O.M. structure 'Normal' rather than the default 'Phantom'.
Now we'd like to drive the assemblies description based on the bolt size used. For example, the description in the parts list would read "5/8" HEX BOLT C/W NUT AND WASHER".
I have an assembly comprised of 2 identical parts that have holes in a radial pattern. The holes were created at the part level, & the holes are obviously in both parts (they are not created by the bolted connection).
I've made a bolted connection using the "By hole" option & I've checked "Follow pattern." The bolted connection is made without any problems, & the "Follow pattern" populates all the holes as would normally be expected.
However, here's the problem: the only bolt/nut/washer assembly that appears to be fully constrained is the one on the base hole (by "base hole" I mean the hole that I initially selected). The other bolts/nuts/washers are not constrained to the holes. So, I can drag the entire pattern & it spins radially about the axis of the base hole.
I've never seen this ridiculous behavior before IV 2013.
I'm making a customized content center library for my company and I'm trying to add a special type of nut but I'm not having any luck. I finally figured out how to author a part and have it show up in the bolted connection tool. Now I'm just getting an error as soon as I select my custom nut.
The error is "Cannot initialize part data table. Please verify the table definition in Content Center editor."
I've attached my part. It's a simple nut for use in aluminum extrusion, the only thing that changes between sizes is the threaded hole.
How to put threaded holes in the outer edge of this part. I need the holes to go where the circles are drawn around the radius, with the direction pointing to the center of the radius.
