Method of making a hammer mill hammer with grooves for receiving hard facing material
An improved hammer mill hammer constructed by forming a groove in an edge of the grinding end of a hammer for receiving hard facing material and placing hard facing in the groove.
1. A method of making a hammer having a rod hole end having a rod hole disposed therein and wherein the rod hole is configured to engage a hammer mill rod so that the hammer can move about an axis extending through the rod hole;
a grinding end being spaced from the rod hole end of the hammer, the grinding end having a length, a width, and a thickness defined between a first face and a second face of the hammer;
an edge extending from the first face to the second face about opposing sides of the length of the grinding end and the width of the grinding end;
a neck connecting the rod hole end and the grinding end;
the method comprising:
forming a continuous groove in the edge about the opposing sides of the length of the grinding end and the width of the grinding end for receiving hard facing material such that a plane, disposed transverse to the axis extending through the rod hole, intersects the continuous groove along a length and width of the continuous groove, the plane also intersecting the rod hole; and
applying a layer of hard facing in the continuous groove.
2. The method of claim 1 wherein the continuous groove along the width of the grinding end is formed at least partially along a first straight line and at least partially along a second straight line wherein the second line is spaced from, but parallel to, the first line and both the first and second line are disposed in the plane.
3. The method of claim 2 wherein the continuous groove about the length of the grinding end is positioned transversely to the first straight line.
4. The method of claim 3 wherein the continuous groove is configured so that a centermost portion of the continuous groove, disposed along the second line, is positioned closer to the neck than the first line.
5. The method of claim 4 wherein the centermost portion of the groove is made to form a pocket between the opposing sides of the length of the grinding end.
6. The method of claim 1 wherein tungsten carbide is used as at least part of the hard facing.
7. The method of claim 1 comprising using tungsten carbide as the hard facing material and applying the tungsten carbide hard facing using a welding process.
8. The method of claim 1 comprising applying a second layer of hard facing over the layer of hard facing.