Gear Technology

Heat Treating Chamfered Parts: Before or After Makes a Difference

/ AEROSPACE HEAT TREAT, AEROSPACE HEAT TREAT NEWS, FEATURED NEWS

 

Source: Gear Technology

 

“For years, I have always told people who ask me that my machines pretty much don’t care if a part is hard or soft,” says James Richards of James Engineering.

In a simple experiment, Richards ran several parts through multiple machining and finishing processes to determine whether the hardness or softness of certain steel alloys had any effect on chamfering. What he found regarding hardness or softness did not surprise him. What he did note were the different outcomes that resulted from heat treating the part before or after chamfering.

“We have yet to find a material that we cannot create a chamfer and/or edge finish on. As to whether we chamfer before or after heat-treating—that’s a very different story.” ~ James Richards

This week’s Technical Tuesday highlights Richards’ article “Chamfering: Hard vs Soft Parts and Before vs After Heat Treating”, which appeared in the July 2019 issue of Gear Technology.

 

Read more: “Chamfering: Hard vs Soft Parts and Before vs After Heat Treating”

Main photo credit: James Engineering

 

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Sacrificial Lambs: Hardness Testing and Heat Treating

/ FEATURED NEWS, HARDNESS TESTERS TECHNICAL CONTENT, MANUFACTURING HEAT TREAT, MANUFACTURING HEAT TREAT NEWS

 

Source: Gear Technology

 

Charles D. Schultz, president of Beyta Gear Service

In a recent blog post at Gear Technology, Charles D. Schultz, president of Beyta Gear Service, addressed the importance of accuracy when describing hardness test location and the reason why “sacrificial lambs” are needed during production.

“I cannot emphasize enough that if you are not cutting up parts or coupons you do not know what is really happening during your thermal processing.” ~ Charles D. Schulz

 

Read more: “Gear Materials: More Inside Heat Treating Trivia”

Photo Credit: Gear Technology

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What’s Going on Inside Your Heat Treated Part?

/ FEATURED NEWS, HARDNESS TESTERS TECHNICAL CONTENT, MANUFACTURING HEAT TREAT, MANUFACTURING HEAT TREAT NEWS

 

Source: Gear Technology

 

It’s no secret to heat treaters that not all methods work well on all parts and specifications. It’s also a hard fact that false readings can result when applying hardness measuring systems, therefore, says Charles D. Schulz of Gear Technology, “critical service parts often require a few ‘sacrificial lambs’ to be processed along with the production parts.”

“I cannot emphasize enough that if you are not cutting up parts or coupons you do not know what is really happening during your thermal processing.” — Charles D. Schulz

 

Read more: “Gear Materials: More Inside Heat Treating Trivia”

Photo credit: Gear Technology

 

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Ask Not What Your Heat Treater Can Do for You…

/ FEATURED NEWS, MANUFACTURING HEAT TREAT

  Source:  Gear Technology

The editors of Gear Technology interviewed five heat treaters.  The question posed to them was, “What can you do for your heat treater?”  Surprisingly, a manufacturer can improve his job turnaround time by making life easier for his heat treater.

Read more:  Ask Not What Your Heat Treater Can Do for You by Alex Cannella, Associate Editor of Gear Technology

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Practical Approach to Determining Effective Case Depth of Gas Carburizing

/ AUTOMOTIVE HEAT TREAT, AUTOMOTIVE HEAT TREAT NEWS, CARBURIZING NEWS, FEATURED NEWS

BOTW-50w  Source:  Gear Technology

“Effective case depth is an important factor and goal in gas carburizing, involving complicated procedures in the furnace and requiring precise control of many thermal parameters. Based upon diffusion theory and years of carburizing experience, this paper calculates the effective case depth governed by carburizing temperature, time, carbon content of steel, and carbon potential of atmosphere. In light of this analysis, carburizing factors at various temperatures and carbon potentials for steels with different carbon content were calculated to determine the necessary carburizing cycle time. This methodology provides simple (without computer simulation) and practical guidance of optimized gas carburizing and has been applied to plant production. It shows that measured, effective case depth of gear parts covering most of the industrial application range (0.020 inch to over 0.250 inch) was in good agreement with the calculation.”

Read More:  Practical Approach to Determining Effective Case Depth of Gas Carburizing by March Li

March Li Metallurgist, Automotive Heat Treating, Practical Approach to Determining Effective Case Depth of Gas CarburizingAuthor March Li -Metallurgist

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