Overseas sales increase, and you need more workers or more automation. For this small processor, automation proved the right choice, with those new robotics saving time and money at Intrepid Industries Inc.
It is a problem many processors would welcome facing. An increase in foreign sales boosted Intrepid Industries Inc.’s business to the point that it either needed to hire for a second and third shift or invest in automation. Erich Bredl, president and partner in the company, chose the latter. “We’re in the process of putting a six-axis Motoman robot on the second molding station, and should be up and running this month,” he said. “We’ve got a small window of a three-day molding run and will get the robot installed and set up to run the mold continuously around the clock. It’s like gaining a second and third shift without hiring people.”
Slideshow: Eight functions performed by the robot
Intrepid Industries Inc. is a RIM (reaction injection molding) processor employing nine near Houston, TX. Bredl explains that the company specializes in a unique polyurethane, Instant Set Polymer, developed by Dow Chemical Co. more than 30 years ago. He started the company to use this material for a variety of applications.
Intrepid’s primary product is a safety gate used to protect ladder-way openings in chemical plants and refineries, along with the various components. “That’s our big item,” says Bredl. “We have two molding stations—the first one with the six-axis robot, which produces only the double-bar safety gate. The second molding station produces everything else such as the hinges, block, and the single-bar safety gate, plus miscellaneous parts and some custom parts.”
Automating an operation as complex as this one required an integrator, and Bredl and Lak Muthu, Intrepid’s chief engineer, chose Interlink Controls (Stafford, TX). Interlink developed the automation layout, designed the human/machine interface, and provided the articulation programs for the Motoman robot. Muthu was key in the development of the tooling and in the overall success of the project.
The process chosen for automation was molding of the double-bar gate. Depending on gate size, the part weighs 10-15 lb, and is more than 200°F when removed from the mold. It is a difficult job for a person to continuously saw, trim, and handle the part. There are eight functions performed by the Motoman robot:
1. Remove the part from the mold.
2. Set the part on a frame to allow for cooling and shrinkage
3. Spray mold release onto the mold surfaces.
4. Remove the coolest part and saw off the overflows and runner system.
5. Place the part onto the trimming fixture.
6. Remove flash by using a routing tool.
7. Sand specific areas to remove flash.
8. Stack the finished gate into a cart.
Simple stuff? Hardly
Although each step sounds simple, these operations were difficult to integrate. At one point, part handling was a major issue, explains Bredl. “The part was either sticking to the mold or it was slipping off,” he says. “Also, there was the possibility that the part might slip off the handling tool