Results : 1 - 20 of 59
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Comparing 4140, 4340, and 5140 alloys Q: Please explain which of these forging materials is strongest for producing connecting rods and crankshafts?
> Cast Aluminum Preforms
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...
> Cold Forging Lubricants
Q: In a review of literature on cold forging lubrication techniques and the types of lubricants applied for such processes, I have learned that phosphate coatings, in conjunction with other...
> Cold-Heading Part Splitting
We use 1020 steel wire to produce a cold-headed rivet that is annealed after production. After heating, the parts test OK, but after zinc plating we experience splitting on 2-3% of the parts. …
> Forging Magnesium Alloys
Q: We are primarily involved in forging brass and aluminum, but now we have the opportunity to forge some magnesium parts. We would like to learn more about magnesium forging. Any advice?...
> Transverse Defects in Steel
Q: We've discovered a particular defect in upset forging, but also in forgings produces at slow speeds in hydraulic presses …
> Forging and Cooling of Microalloy Steels
Q: Will you detail special cooling-rate controls for microalloy steel forgings?
> Fracture-Split Con Rods
Q: What are the comparisons of mechanical properties, including fatigue strength, for fracture-split con rods?
> Grain-Size Requirements with 316L Forgings
Q: We work with various forging suppliers of hip and other joint replacements: Can you describe the grain sizes that may be specified in 326L forgings. Also, what is the difference between 316 and...
> What is RMS?
Q: Can you explain the meaning of RMS with regard to surface finish?
> Centerline Micro-Cracking
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. …
> Press Forging Die Failures
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?
> Trimming Ti-6Al-4V and PH stainless grades
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...
> Cracking stainless eyes, hooks (marine applications)
Q: Some time ago, you explained that when using 303 and 304 stainless grades we needed better control of the forging temperature. You were right that the 303 was actually the most difficult to...
> Which press to forge aluminum?
Q: We purchase a component part forged from heat-treatable aluminum alloy but we would like to produce it ourselves. We are wondering what kind of press we should consider.
> White powder causing blisters?
Q: I just read your article on aluminum forgings (see Forging, July/ August 2007) and I also noted your comments on aluminum blisters. As we have had some strange blisters on our material recently, I...
> What have you learned?
Q: What has your column-writing experience taught you about the kinds of problems facing the forging industry?
> Definition of sprue
Q: I enjoyed reading your article in the March/April 2002 issue of Forging on “Mislocated Parts.” I understand what the “sprue” does but how do you pronounce it and what is the meaning?
> Effects of forging temperatures on aluminum alloys
Q: Please help me understand the pros and cons of forging aluminum at lower temperatures, particularly with regard to material properties. We have a customer asking why forge temperatures are vet...
> Heat-treating a cold-headed pin
Q: How does heat treating affect a cold-forged pin made of 1022? I believe that the heat treatment would result in a more homogeneous and consistent part than cold working/heading alone.
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H. James Henning answers forgers' technical and operational questions. For more than 40 years, he held key technical positions in the forging industry, most recently as director of technology for the Forging Industry Association. He is president of Henning Education Services in Columbus, OH, specializing in customized education and training in forging technologies. Guidelines and recommendations offered here are based on information believed to be reliable and are supplied in good faith, but without guarantee. Operational conditions that exist in individual plants and facilities vary widely. Users of this information should adapt it, and always exercise independent discretion in establishing plant or facility operating practice.
