那些与金属合作的人已知为千年来刺激材料加强它。甚至青铜时代铁匠均通过锻造和预应于锤子的吹击来锻造和预应力。
Thousands of years later, technology has advanced to shot peening, a technique in which metal is bombarded with millions of tiny steel balls from a small nozzle at high velocity, creating microscopic dents, or dimples, in the surfaces of metal parts.
The peening machine offers a simple HMI interface and seven axes of motion.
虽然听起来逆行，但喷枪实际上使材料更耐用，因为凹坑转换拉伸应力，这可能损害金属完整性，以将材料保持在一起的压缩应力。几乎所有的疲劳和应力腐蚀失败在一部分表面开始，但裂缝不会在压缩压力的区域中开始或扩散。由于来自喷丸的重叠凹槽在金属表面产生均匀的压缩应力层，因此射击喷丸赋予部分的寿命在一部分的寿命增加。
This increased life is especially important when it comes to mission-critical aerospace components like engine blades. “Virtually every piece of a jet engine that moves is shot peened,” said Tom Beach, president of Connecticut-based Peening Technologies Equipment, whose computer-controlled equipment helps transform metal into reliable airplane parts. Beach says that compared with the cost of aerospace parts, shot peening is a fairly inexpensive process.
Peening Technologies was able to reduce costs when developing its systems with the assistance of Axis New England, their local Parker distributor. “We wanted to create a multi-axis and scalable shot peening machine that had a simple HMI interface but still offered sophisticated motion control,” said Beach. The machine they created includes BE servo motors, MPP/MPJ servo motors, PX gearboxes, Aries servo drives, ACR controllers, 6K controllers, and associated accessories, which provide up to seven axes of motion. (For now, the HMI is a custom unit Beach designed, though they have plans to upgrade to Parker’s InteractX.) Older style, single axis, multi-nozzle machines required users to spend time setting up each individual part, but robotic automation allows a user to set up multiple parts by loading a single program into the machine.
The final result has been a machine that allows for a shortened development cycle—and happy end-users. “The best feedback is there’s not a lot of feedback,” says Beach. “There’s nothing to complain about. Our customers have been very happy with this very reliable machine.”
喷枪造成显微凹痕，将拉伸应力转换成压缩应力
Parker Hannifin Corp.
www.parker.com
Filed Under:ALL INDUSTRIES,设计世界文章,The Robot Report,Material handling • converting
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