Skip navigation
Menu
Archive

Ask Jim

Highlights
Dry molybdenum disulphide is applied by tumbling or blasting which may be expensive
Cold Forging Lubricants
Dec 15, 2008
Is there some lubricant that has superseded phosphate coatings for cold forging processes...
Cast Aluminum Preforms
Cast Aluminum Preforms
Dec 15, 2008
Q: I am looking for information, both technical and statistical, on the status of cast aluminum preforms for forgings. I found scattered references online, but not much real information. What is the status of this technology?
Highvalue automotive wheels are among the most recognizable applications for forged magnesium alloys
Forging Magnesium Alloys
Dec 15, 2008
Some tips for those just starting to forge magnesium alloys Forging pressure is no problem Avoid cracking Use hydraulic presses or crank presses
Transverse defects are common in upset forgings of stainless steel
Ask Jim: Transverse Defects in Steel
Dec 15, 2008
One defect seems to reoccur in upset forging, and in forgings produced at slow speeds in hydraulic presses Stainless ...but in 4140 too? Watch for lateral shearing
quotFor larger parts it may be necessary to install one or more fans to speed up the aircooling cycle and in turn to ensure a proper hardness response This may be especially important for forgings that have section sizes larger than about 25 in thick This may also reduce the length of the conveyors needed to ensure sufficiently low temperatures before entering the final boxesquot
Forging and Cooling of Microalloy Steels
Aug 27, 2008
Tips for this thermo-mechanical process start with proper controls and “certifiability”. Forging temperature Forging reductions Post forging cooling rates
What is RMS?
Jun 19, 2008
Q: Can you explain the meaning of RMS with regard to surface finish?
Fracture-Split Con Rods
Jun 18, 2008
Q: What are the comparisons of mechanical properties, including fatigue strength, for fracture-split con rods?
Press Forging Die Failures
Apr 21, 2008
Q: We press forge a shaft gear to close tolerances and we use a shrink ring assembly for the bottom die. How can we address interference?
Centerline Micro-Cracking
Apr 21, 2008
Q: We’ve found some microcracking in billets forged on a steam hammer. The upset ratio is 2.5 to 1, and our forging temperature is 1,800°-2,200ºF.
Trimming Ti-6Al-4V and PH stainless grades
Feb 18, 2008
Q: Some time ago you responded to our problems with trimming Ti grades. Some of your ideas have helped, but we are still having some problems that just do not go away especially with the PH stainless grades. Do you have any other ideas?
Load More