Sirius
New member
- Jul 16, 2002
- 37
I wonder if anyone can help me out with something I am trying to draw......Its hard to explain, but Ill give it a go.
Imagine a smallish pressing done on a press tool, it consists of three main faces - two of which are at compound angles.The three faces are blended together with two radii. So, it has a flat portion up to a bend which axis lies on an angle in plan view (say -30 degrees), the next face is tipped back at an angle until it meets another radius, from which another face is generated (twisting down and to the left). The edges of all the faces are 'swiped' down so it has a 5mm 'leg' to add stiffness to the pressing.
On the first flat/level face, it has a contuored edge at one side - sort of a straight portion then a curve then a tangent line/edge. Into this, there is a pressed 'tunnel'(say a 5mm archway) which sweeps around the contoured profile and blends into the first radius and compound face - it sort of runs into it and then needs to be blended. As the tunnel goes around the profile and into the compound face it gets slightly wider and one side of the tunnel flares out at an angle as it goes around (so that its leg matches into the first compound angle's face at right angles to it when it smacks into it therefore continuing the tunnel leg up the compound face).
We have got sent an iges wireframe file with a *very* basic outline on (no radius's or anything, just stick framework with an arc depicting the blends required at certain places). I need to properly draw the tunnel area and especially the very complicated shape where the ever changing tunnel meets the compound face and radii. This is proving to be very difficult....... I have tried to fillet/blend surfaces together but its not working out right due to the complexity of the area.
It would be ok if I got it somewhere near right, aslong as all three blended properly together and looked similar to what they are wanting (as there is nothing governing the actual shape in the requirements).
I am currently drawing a 'die block' as a 'part' and I have managed to construct all the other angles/radii required to press the part before the 'swipe up'stage, but the tunnel shape needed is causing a right headache.
If it was a pure 5mm semicircular profile swept cut along a profile then I would be alright - but as it goes wider and one edge angles out tangentially as it goes along the path I just wouldnt know how anyone could construct that shape. It would be a sort of 'coons patch' I suppose made up of different sections and governed by two or more rails....is this shape possible to generate solidly using any sweepcut or path etc???.I have tried surfacing (to the best of my ability) in the hope of using 'solcut' to remove the approximate shape from my die block, but its too hard to contruct and it needs to very accurately drawn as one surface be sucessfully cut from the part.
I think what I need to do is somehow draw lots of 'sections' through the shape I have nearly got right as surfaces, at intervals around its path and draw two control rails and somehow loft or sweep them all together solidly so it cuts that shape out....can you use multiple profiles along a single sweep???.
If I could redraw the whole component properly as surfaces, then I could subtract it from the solid, but this would also be a major task.. I could also 'bend' the flat development of component I have worked out, but because the three faces are bent, it wont let you 'bend' the swiped sides down because its too complicated a process I reckon.
I know it must be very difficult for you to follow, but if anyone gets the jist of what Im talking about and knows what I should try I would be most grateful.
Sirius.
Imagine a smallish pressing done on a press tool, it consists of three main faces - two of which are at compound angles.The three faces are blended together with two radii. So, it has a flat portion up to a bend which axis lies on an angle in plan view (say -30 degrees), the next face is tipped back at an angle until it meets another radius, from which another face is generated (twisting down and to the left). The edges of all the faces are 'swiped' down so it has a 5mm 'leg' to add stiffness to the pressing.
On the first flat/level face, it has a contuored edge at one side - sort of a straight portion then a curve then a tangent line/edge. Into this, there is a pressed 'tunnel'(say a 5mm archway) which sweeps around the contoured profile and blends into the first radius and compound face - it sort of runs into it and then needs to be blended. As the tunnel goes around the profile and into the compound face it gets slightly wider and one side of the tunnel flares out at an angle as it goes around (so that its leg matches into the first compound angle's face at right angles to it when it smacks into it therefore continuing the tunnel leg up the compound face).
We have got sent an iges wireframe file with a *very* basic outline on (no radius's or anything, just stick framework with an arc depicting the blends required at certain places). I need to properly draw the tunnel area and especially the very complicated shape where the ever changing tunnel meets the compound face and radii. This is proving to be very difficult....... I have tried to fillet/blend surfaces together but its not working out right due to the complexity of the area.
It would be ok if I got it somewhere near right, aslong as all three blended properly together and looked similar to what they are wanting (as there is nothing governing the actual shape in the requirements).
I am currently drawing a 'die block' as a 'part' and I have managed to construct all the other angles/radii required to press the part before the 'swipe up'stage, but the tunnel shape needed is causing a right headache.
If it was a pure 5mm semicircular profile swept cut along a profile then I would be alright - but as it goes wider and one edge angles out tangentially as it goes along the path I just wouldnt know how anyone could construct that shape. It would be a sort of 'coons patch' I suppose made up of different sections and governed by two or more rails....is this shape possible to generate solidly using any sweepcut or path etc???.I have tried surfacing (to the best of my ability) in the hope of using 'solcut' to remove the approximate shape from my die block, but its too hard to contruct and it needs to very accurately drawn as one surface be sucessfully cut from the part.
I think what I need to do is somehow draw lots of 'sections' through the shape I have nearly got right as surfaces, at intervals around its path and draw two control rails and somehow loft or sweep them all together solidly so it cuts that shape out....can you use multiple profiles along a single sweep???.
If I could redraw the whole component properly as surfaces, then I could subtract it from the solid, but this would also be a major task.. I could also 'bend' the flat development of component I have worked out, but because the three faces are bent, it wont let you 'bend' the swiped sides down because its too complicated a process I reckon.
I know it must be very difficult for you to follow, but if anyone gets the jist of what Im talking about and knows what I should try I would be most grateful.
Sirius.