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Slug Pulling a Problem of the Past

May 2, 2025
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…for Superb Industries, an Ohio metal former that employs a special tool to improve slug retention across a range of jobs and processes.

Ninety miles south of Cleveland, the small town of Sugarcreek, OH, is quite the find. Nestled in Ohio’s Amish Country, ‘The Little Switzerland of Ohio’ boasts what once was the world’s largest cuckoo clock—featured on the 1977 cover of the Guinness Book of World Records—and exudes an Old World rural charm. Tourists flock to this hamlet as a reminder of less hectic and slower-moving times.

DTC-SlugRetentionMachineHard to believe that Sugarcreek boasts leading-edge manufacturing technology and capabilities, but it certainly does. One stellar example: Superb Industries, founded by brothers Dan and John Miller in 1986. The Millers trace their lineage 10 generations back to the Mueller artisan-farmer clan that arrived on American shores in 1749, and the brothers infused that family experience into their burgeoning business. Success followed, and by 2000, Superb Industries outgrew its small garage, eventually expanding to its current 70,000-sq.-ft. facility in Sugarcreek.

With an organizational chart illustrated as a majestic shade tree—a management trunk supports the branches of people and processes that yield the ‘fruit’ of parts and components. The company incorporates the traditional values of its family owners while investing in technologies and automation that rival that of the most sophisticated manufacturers on earth. 

Superb Industries’ 70 employees produced to the tune of about $35 million in revenue for 2024—growing annually at a double-digit clip since 2019. And, the company has the distinction of being named by Inc. as among the top 100 fastest-growing privately held U.S. manufacturers. Markets for Superb Industries parts, components and assemblies—almost 1.4 billion parts shipped annually—include 35% automotive followed by a smaller percentage to appliance, and the rest split between security, construction, electronics and others. With so much going out the door, the manufacturer—holding ISO 9001 and IATF 16949 certifications—still boasts an on-time-delivery rate surpassing 98%.

Sophisticated Operations Test Slug Retention

To produce quality parts in such high volumes, Superb Industries relies on a stable of Bihler automated forming machines and Bruderer stamping presses, in addition to injection molding machines. The stamping presses range in capacities from 30 to 120 tons, and the Bihler lineup includes GRM80 and GL3000 manufacturing cells as well as Bimeric 1500 and 3000 servo-driven cells.

With impressive inhouse automation and integration expertise, the company often combines Bihler and Bruderer equipment in cells to produce unique electrical components. These include terminals and connectors of brass, copper and precious metal alloys, packaged in bulk, reel-to-reel or stacked for automated assembly.

“This precision machinery, and our ability to tie it together along with our specialized tooling, allows us to maintain consistency in production via what we call hybrid, high-speed stamping,” Susan Miller, Superb Industries human resources manager, says.

Much production at the manufacturer falls under nondisclosure agreements and proprietary processes and technology, but suffice to say that the ability to form and join dissimilar thin-strip materials and produce components—often gathered into takeup reels—at speeds into the thousands of hits/min., while maintaining tolerances on the level of ±0.001 in., is quite impressive.

In one case, to produce feature-filled rings hands-free, a Bruderer press stamps the rings, followed by feeding into Bihler machines for further forming, such as placement of bumps on the outer diameters. With so much processing, the rings must remain perfectly circular. Accomplishing such a feat speaks to the technology in use and applied expertise. 

To produce to exacting standards at high speeds, while meeting challenging volume and delivery needs, production cells must stay online. In such an atmosphere, wayward slugs produced during stamping can cause havoc, and in fact, at times they have at Superb Industries. While the company employs redundant setups to keep production humming during slug-pulling troubles, sending out tooling for slug-retention remedies often was a week-long process or longer, and, of course, at added cost. This often occurred after taking on older tooling for takeover programs, where slug pulling proved especially problematic. 

New Solution for Slug Pulling

In 2023, company management was introduced to the SlugKeeper slug-retention machine from DTC Products, designed to prevent slugs from pulling out of the die cavity, thus ensuring scrap-free stamping operations without wayward slug travel and buildup that can stymie production and damage parts, strips and tooling.

The SlugKeeper machine employs grinding wheels, selected based on the thickness of tool material to be removed, to grind grooves at a certain angle and depth into the die opening. These grooves produce a tang on the slug, which is distorted as it is pushed into the die opening. This distortion causes the slug to remain in the die after the hit. The die and the slug from the following hit in the stamping process then push this slug through the die opening.
The product can be used on hydraulic and mechanical stamping presses, punching machines and forming systems such as the lineup of Bihlers at Superb Industries. The manufacturer has used the SlugKeeper on dies that previously experienced slug pulling, as well as on takeover transfer dies and new steel and carbide die sections, which the company builds inhouse, reports tooling manager Lee Heilman, who as of this writing has just retired. To aid in correct grinding depth and angle, Superb Industries opted for a SlugKeeper version that includes an optional microscope and display monitor.

Simple to Use, Effective Across a Range of Tooling

“We have found it very easy to use and to set up,” reports Heilman. “The display screen is well worth the little bit of extra money, allowing us to see down the die openings better to touch off the smaller wheels. The included instructions accurately detail the proper grinding wheel to use with a given material and how many spots to grind. Sending out dies for slug retention had cost us time and money. Now, we bring a die section into the toolroom and within a few minutes have the slug retention added and have the die back running.”

At about 8 in. high and weighing less than 15 lb., the SlugKeeper can be employed on tooling at the press as long as compressed air is available—a method that Superb Industries often employs, reports Heilman. He, along with Greg Costa, director of engineering and tooling, and Lavern Miller, tool and die maker, detailed the SlugKeeper’s use with MetalForming and provided a plant tour. All three report that the SlugKeeper provides a better slug finish and improves slug holding as compared to wire-cutting tests performed at Superb Industries. And, Costa, who had just joined Superb Industries prior to our visit, reports having used SlugKeeper effectively at previous metal-stamping facilities. 

For Heilman, Costa and Miller, the SlugKeeper improves on other methods used to address slug pulling, including introducing tighter tolerances into tooling. While tighter tolerances can improve slug retention, resulting punch and die wear cancels out the cost and productivity benefits.

As Heilman concludes: “the SlugKeeper is an excellent tool in our toolbox.” MF

Industry-Related Terms: Alloys, Brass, Case, Die, Form, Forming, Grinding, Slug, Strips, Thickness, Transfer, Forming, Assembly, Forming, Punching, Stamping
View Glossary of Metalforming Terms

 

See also: Bihler of America, Inc., Bruderer Machinery, Inc., DTC Products Inc.

Technologies: Stamping Presses, Tooling

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