Another little part we have managed to copy, any of you know where it goes?
Here is how we made a replacement.
Ford were kind enough to put two holes in this part, both 16mm across. Ford likely used these holes for the locating pegs in their press tooling, we will be doing the same.
You will notice that the area around the hole is slightly lower than the area around the slot so we will have to account for this in our tooling.
Initially we produced two 10mm mild steel plate that matched the internal dimensions of the part, here you see one of the 10mm plates;
Here is a picture of the plate on top of one of the Ford part, it nearly sits inside the flanges;
If you had a 'one off' you needed to produce for your own project then in most cases the tooling could be made from plywood scraps if the 'pressing' part of the operation was not required.
The part to be produced will be clamped between the two halves of the tool and formed around the edge by hitting with a hammer, but first we need to modify the press tool to provide the step in the panel. To do this we added small pieces of 1.5mm mild steel the the inner surfaces of the tool, the 1.5mm step matches the original part. These additional 1.5mm parts were plunge welded to the tool halves;
The welds were simply cleaned off with a flap wheel. The surface, while having some marks was adequate for this task, although manufacturers would likely smooth and polish the faces of their press tooling to a far greater standard.
Next we need to round off the edge of the tool that the part will be shaped over. This is necessary to match the original but also because forming the part over a right angle edge might result in the part being 'cut' between the tool and the hammer. This picture shows the radius we applied to the edge of what we will call the 'top' tool;
Since there are no 'right' and 'left' hand of these parts we only need to radius the 'top' tool.
Now the tooling and our 'part' can be assembled ready for pressing. Initially we wondered if sufficient force could be applied with just the two 16mm h/t bolts to produce the desired result, otherwise the tooling would need to be used in our workshop press.
But it did work with just the clamping force of the bolts, here you see the part still in the tooling, the red line shows the shape of the part;
Removed from the tooling and compared to the Ford part you can clearly see the tooling has worked;
Having satisfied ourselves that the pressing part of the operation worked we re-assembled the part and the tooling and prepared to start hammer forming the part. You can see it is starting to take shape;
We clamped the assembly between the jaws of the vice to provide additional support for the tooling.
During the hammer forming process it was necessary to remove the assembly from the vice and re-clamp it using the heads of the bolts to provide better access to the flange area, this is when we were able to see why it was so difficult to form the corners of the part. The excess material at the corners of the part was causing this problem, we know now to reduce the material at the corners of our 'blank' but about 1.5mm for the next time;
We trimmed off the excess material in the corners with a flap wheel using the tool as a guide;
and then completed the hammer forming.
Once forming was complete we dismantled the tooling and removed the part, compared to the Ford item it looks just fine;
I do hope that the information we have included here will help others produce parts for their own projects, these processes can be applied to small and large parts alike.
Remember, it all starts with a flat piece of metal, the resulting shape is only limited by your imagination.
TIM