Hi,
We have a shear shredder operating in a difficult application where it is shredding mild steel with a somewhat thin cross-section (3/16" minus). The cutters in the shredder are general purpose blades made from 4140 heat treated to 52-55 RC. The blades are seeing both rapid wear and...
We build a lot of heavy equipment for which we design lift lugs. I have been told that the hole that a shackle goes through for lifting should be 'drilled' versus 'burned out/plasma' cut. Is there any code that supports this, or is a plasma cut hole acceptable?
I have a feed screw that is conveying material and then forcing it into a discharge tube. The bulk density of the product is 15 lb/ft^3 when it enters the discharge tube and 50 lb/ft^3 when it exits. The discharge tube is made from 316 ss and is 10 feet long (20 inches in diameter). If I can...
I want to fabricate an auger screw out of two dissimilar materials. Normally we use an SAE 8620 hot rolled material for the shaft and an 8620 casting for the flight. In this process we preheat the shaft to 400-500 deg F prior to welding the flights to the shaft.
We now have a very severe...
We make a fabrication of an auger that consists of welding a cast 8620 flight to a 8620 steel shaft. We are having a difficult time meeting our delivery requirements based on the lead times for the cast flights. A foundry we talked to suggested we use a 80-60-03 ductile cast iron as a...
I have a screw type extruder that heats up from the friction of the material being processed. Some of the material being processed has a low melting point. I want to cool the last flight of the screw extruder enough that the temperature at the end of the extruder remains below the melting...
I have an application where a flanged shaft is bolted to the rotating flange on a hydraulic motor. The bolts being used are gr12.9 - M24's and torqued to 664 ft-lbs (lubricated with loctite). The motor is threaded, so the bolt with a narrow washer (against the bolt head) goes through the...
I am looking to bolt two steel surfaces (A36) together. Most charts I have found show a static coefficient of friction of .74 for clean and dry sufaces. The surfaces will be subjected to heavy loads that would cause the surfaces to slide against each other. I am limited by the number fasteners...
Hi,
I am trying to figure out how to make a flat pattern of a screw conveyor type flight. I can model the shape exactly using a Sweep with a profile and a Helix, but I can't figure out how to make the flat pattern.
Does anyone have any suggestions?
Thanks
I have a 4140 plate 1"x6"x13" that is 40 RC. I would like to use the plate for a different application that requires a hardness of 52-55 RC.
Following the heat treat (to 52-55 RC), I will Blanchard grind the part to 3/4" thick.
Do I need to anneal the part before prior to the 52-55 RC heat...
