One Minute Mentor: Mechanical Shock

Mechanical shock is sometimes used to stabilize tool steels. One method of producing shock is to suspend the part so that it hangs freely and then strike it with a wooden hammer. This is believed to set up elastic waves which add to the magnitude of the residual stress imparted by the previous heat treatment. At locations where the resultant magnitude of stress exceeds the elastic limit, plastic flow should occur and result in stress relief. This would be manifest by higher dimensional stability. A shock treatment should not be considered as a substitute for a thermal method of stabilization but rather as an auxiliary method which enhances stabilization.

Dimensional changes in W1 steel resulting from dropping on a concrete floor as determined by Fletcher (are shown in Fig. 6. The untempered specimens showed greater dimensional changes than the tempered specimens due to the higher level of residual stress in the untempered condition.

For more information, click on the link below (subscription required). Then scroll to Figure 6.

Jon L. Dossett; George E. Totten, *Control of Distortion in Tool Steels*, ASM International, 2014
https://doi.org/10.31399/asm.hb.v04d.9781627081689

Seco Vacuum delivers Vector Furnace to major automotive supplier in Mexico

Seco Vacuum, Meadville, PA, announces that an international Tier 1 automotive supplier headquartered in the USA has ordered a Vector vacuum furnace for one of their facilities in Mexico.

The Vector 15VP furnace is capable of a variety of thermal processes. Its hot zone measures 36x36x48 inches (900x900x1200 mm) and has a 3,300 lb. (1500 kg) capacity. It features convection heating and a mechanical vacuum pump system, meeting or exceeding the specifications necessary for the production line’s brazing process.

Typically, SECO/VACUUM furnaces are custom-engineered; however, this particular furnace was fabricated ahead of time as a stock item to meet the contingency of a customer requesting immediate delivery. This strategic move allowed the heat treat partner to quickly and seamlessly ramp up production capacity. Additionally, if production demand shifts, the new Vector vacuum furnace can be easily repurposed for other heat treat processes, offering significant versatility.

“We built this furnace to be ready to be shipped and put into operation very quickly, which is just the solution they were looking for,” said SECO/VACUUM Managing Director Piotr Zawistowski.

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Bodycote appointments Group Chief Executive

Bodycote, Macclesfield, U.K, announced the appointment of Jim Fairbairn as the new Group Chief Executive, succeeding Stephen Harris upon his retirement. Fairbairn is set to join the company and its Board in March 2024 and will assume the role of Group Chief Executive in May 2024, following a structured transition period. Stephen Harris will retire and step down from the Board at the Annual General Meeting on May 31, 2024.

Jim Fairbairn, 54, brings a wealth of experience in managing engineering businesses. His career, spanning over thirty years, includes significant roles at John Wood Group, PE-owned Clyde Bergemann, Howden Group, and Megger Group, culminating in substantial experience as both a Divisional and Group CEO.

Fairbairn’s most recent position was Group CEO at Megger Group, a test and measurement specialist based in Dover, which he joined in 2017. Under his leadership, the company saw significant revenue growth to £325m and a notable increase in operating margins. He also played a pivotal role in evolving Megger’s strategy and culture. Before Megger, he held executive roles at Howden Group in Glasgow from 2009 to 2017, ending his tenure there as President of the Howden Power, Environment and Process business, overseeing global product and service revenues exceeding $1 billion across 19 sites worldwide.

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