<b>WEB EXCLUSIVE:</b><br />Driving JIT with new technology implementation

September 30, 2001

Just-in-time specialist World Class Plastics implements new equipment and technology with forethought and consideration. As a result, the benefits of these investments are quickly realized.

Wouldn't it be great if you could buy all of the high-tech equipment your heart desired? Imagine all the problems that could be solved. Your molding operation would practically run itself, right? Of course, to be successful molders must plan and implement that new technology in an intelligent way, taking human factors and specific applications into account. 

That's the conclusion World Class Plastics Inc. (WCPI) reached when it set out to add optical gauging, automatic degating, and a sophisticated SPC system to its 32,500-sq-ft plant in Russells Point, OH. WCPI is a privately held custom molding operation that has grown in seven years from one press and one customer to a $10 million-plus molder producing 10 million close-tolerance parts/month. 

This plant specializes in JIT production for customers in the automotive, medical, appliance, and industrial markets (see "JIT on Steroids," July 2000 IMM, p. 14 ). Many products go directly from floor to truck in this scenario, so the need for automation, tracking, and accuracy is obvious. Yet, before implementing any new technology, WCPI first explored the benefits it wanted to achieve and then looked for the best solution and implementation method to support those goals. 

WCPI molds several parts for the PT Cruiser. One such part, an instrument cluster bezel, is automatically trimmed and degated using a servo degating robot.

Degating Options  
"We strive to minimize variation in the process," says David Wisniewski, engineering and R&D manager. This is why the company decided to install CNC degating systems (Aeroboy SK-250 from SAS Automation). WCPI has 25 Sumitomo presses ranging from 18 to 350 tons, each of which is serviced by Yushin servo robots and sprue pickers. The degating systems were placed on the end of the servo robot traverse beam. 

"Using CNC degating instead of doing it manually produces more consistent results, and the quality goes up," explains Wisniewski. In addition, the system helps molding technicians, each of whom is generally responsible for running five to six machines, to manage the process and consistently get good parts. 

To help ease the installation of the systems, WCPI purchased a modular system. "The quick-change end-of-arm-tooling (EOAT) systems slide in and clamp rather than screw down," explains Wisniewski. "As a custom molder, we are always changing jobs. We have two dedicated presses, but the rest can run jobs from two to three days down to 6 hours. So we needed a flexible system." 

A recent visit to the plant illustrated this concept. In a workcell with a 160-ton press, instrument cluster bezels for the PT Cruiser were automatically degated and trimmed. The tool that WCPI inherited wasn't designed for ease of manufacture, according to Wisniewski. It should have been hot-edge gated; instead, there were two small subrunners coming off the hot manifold. "We have to nip the subrunners and flush trim the gates. One runner is situated behind a rib, so we needed a reach-around cutter." JDV Products

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