Excavators were purchased without drawings for replacement elements.
Of course, I made only the model and the drawings. The new buckets were assembled by workers: welders and locksmiths, I only controlled them.
I worked with one office, engaged in the repair of mining and metallurgical equipment.
They brought "dead" buckets of excavators and grapples from the nearest quarries and mines. Basically the company was engaged in operative latent holes, replacement of armor and teeth on these ladles.
Buckets come in varying degrees of depravity and you can not determine with an inexperienced look where and what to change. Looking closely, you can see where the walls are crumpled, where the armor was sewn up, where it's time to change the teeth ...
First, the "killed" pieces begin to be cut off. This time the carver decided to work after 17:00, but then I came and began to interfere ... As a result, I began to work, and he went to smoke.
This is a bucket. He lies on his side. Vertical metal stripes are the same armor on the bottom.
*** It's the same:
Material of walls, lugs and non-working parts - structural steel 09Г2С or 10ХСНД (GOST)
13Mn6 (DIN)
Bottom armor, side armor / side lining, side cuts, seam protectors, "tablets"("dots" on a walls, if you google different types of the buckets, you find what is it), tooth adapters, side and front blades - 14ХГ2САФД steel (GOST), and also Ruukki Raex 400/450/500, Hardox 400/450/500
The teeth themselves are castings from 110Г13Л (GX120Mn12) or similar steel.
Explaining that where is:
Example. Excavator bucket Doosan XXXX (I do not remember the brand)
There are protective pads, holes for fixing the lining or incisors on the side walls (side cutters). The red dotted line shows the beam of the ladle in section. This is a sheet bent over a dashed line - thus ensuring the rigidity of the entire structure. Inside the space, bounded by the dotted line is emptiness. Dimensions A and B are important connecting. And the diameters of B can be different.
The sheet is bent approximately in this way:
And here you see this beam:
On the drawing this beam is inside the red oval:
As you can see, the bottom is cut off and somewhere should be close ... Here it is at the very bottom, under the cut off parts of some other bucket - they are filled up:
The adapter is welded, the tooth is fixed with a pin, since the tooth is made of hard-welded steel. Everything is shown clearly ...
Here's another picture. The dimensions of C and C1 are shown as well as the "alpha" angle. The slope of the "alpha" surface reduces the resistance of the bucket when moving in the rock.
To make a "copy" of the bucket, enough of the exact connecting dimensions of A, B and С. On a broken bucket to recognize them is problematic, but you can .... rounding to the standard, or by the mind, measuring on the excavator (new), or conducting industrial espionage (stealing drawings), or ask the manufacturer. In our own realities we make the tolerance of + -10 + - 5 mm, except for the precise details (diameters of the fingers and repair bushings), or we make completely new nodes with new dimensions (undesirable).
It is also necessary to measure the dimensions of the bucket.
When copying, of course the exact form is not obtained. The connecting dimensions are important. But I did close to the original, departing for a decent distance, photographed the side of the bucket with a telephoto lens, then I selected the radii of fillets in CAD, "tracing" the outlines.
Or in another way: on the side wall of the ladle drew a grid (crosses) 200x200 mm and then translated it on to paper.
Like here:
Everything is visible: both the side wall armor and the weld (white rectangles and unpainted ones), and even the places of the steel stamped on the parts, as well as the tooth adapters and the protection of the blades between the teeth, can be seen:
SSAB is a Swedish office, manufacturer of high-strength steels
***Hardox 450 on the lining is visible
Inner Armor / Lining
Corner seam protection:
Adapter and my "paws" in "Ralf Ringer" boots...
***Very "dead"...Absolutely....The "TORO" transporter bucket.
I make measurements and sketches.
Carry a rough and precise instrument and a pile of paper with me.
In general, all this is modeled in the CAD type of Compass or Solidworks:
In the process of working on the drawings, there are many problems. As a rule, the customer is not always competent and requires the impossible. But I resist and do the work correctly.
This is the first time I've ever learned so much on Steemit, thank you so much for contributing such great education.
Following for more great posts.
Thank you
I will try to write more interesting...
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