Results : 1 - 20 of 49
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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. At this point, we have...
> 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.
> Defects with aluminum
Q: We forge steel, primarily, but are forging some aluminum alloys now, and finding some defects we cannot define, because they seem to occur after the forgings are machined and coated. Do you have...
> Oversize problems
Q: What is the industrial norm/optimum die surface needed after cutting required cavities? We consistently have oversizing problems with a ball yoke, despite sinking a total depth of 0.005 in. below...
> Pitting problems on gear forgings
Q: We forge near-net gears and sometimes find deep pits in the tooth profile. When these occur, generally there are several pits on each part, varying from visual to very deep. They are always...
> Furnaces to heat aluminum billets
Q: I have been asked to specify an oven or furnace to heat aluminum billets (6000, 2000, and 7000 alloys) for forging. It will be serving a fairly large forging press, over 2,500 tons. We hope to set...
> Tapping forged nuts
Q: We manufacture a slotted hex nut out of 4340 alloy steel heat treated to Rc 32-38. We buy the material in the normalized and tempered condition, then machine it completely followed by a quench and...
> Surface finishing requirements for hot forgings
Q: I'm searching for information-on an industry standard for surface finish, including nicks and dings, for a 4140 steel hot forging. A customer is causing us to "apple polish" every forged surface...
> Choosing steel for impact tools
Q: What steel do you recommend for an impact tool that weighs about 2 to 3 lb. We have been considering S7 but we are having difficulty locating information on the sources for the forgings. We are...
> Upsetter ratings
Q: We are considering adding some upsetting machines, and I would like to know more about their size ratings (e.g., 4-in., 7-in., etc). What exactly does this mean? I’ve heard various explanations,...
> Grain growth problems in stainless steel forgings
Q: We have problems with high-nitrogen stainless steel forgings. The parts are not typically nitrided, …
> Switching from carbon to stainless
Q:We have been manufacturing carbon steel forgings for years and recently started manufacturing 304/304L/316/316L stainless steel forgings — but we have cracking problems with stainless. Do you have...
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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.
