Article From: 8/19/2009 Production Machining, Lori Beckman, Managing Editor
While pondering a topic for this month’s column, the term “wiper inserts” caught my attention as I was browsing PM’s Web site. I wondered why the word “wiper” is used to describe this certain type of insert.
After doing some research and talking to my editor, Chris Koepfer, I learned that the explanation is really quite simple. A wiper insert has an edge behind the cutting tool nose radius that “wipes” or smoothes the scalloped tops that would otherwise have been created. According to Sandvik Coromant, “On a conventional insert, the nose of the edge is only one radius. The wiper edge, however, is made up of a large, main radius complemented by several smaller radii.”
Not only do wiper inserts accomplish smooth surfaces—and if the material allows, they will eliminate a grinding operation—but these additional radii are also designed to double the feed rates of roughing and semi-finishing operations while achieving the specified surface finishes.
Other benefits of this insert include chatter reduction, or vibration dampening, as a result of widely distributed cutting forces at the cutting edge. Sandvik also claims a wiper insert can last as much as 20 percent longer than a non-wiper type, depending on the material being cut.
If you would like to know more about a certain technical metalworking topic, please let me know. Maybe I can do some research for you for my next column.