Cutting – Tool or tool with support – Toothed blade or tooth therefor
Reexamination Certificate
1999-02-12
2001-09-11
Hughes, Thomas (Department: 3726)
Cutting
Tool or tool with support
Toothed blade or tooth therefor
C083S839000
Reexamination Certificate
active
06286406
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to cutting devices and more particularly to a method of making an injection molded carbide insert for receiving a cutting tip therein.
Cutting tools using carbide cutting tips or carbide inserts with diamond cutting tips have been known for many years. However, in the manufacturing of cutting tools with diamond cutting tips, the attachment of diamonds to inserts or attachment to the tips of the cutting tools, particularly saw blades and the like, have presented many difficulties. Specifically, diamonds have presented difficulties in maintaining their bonds to a cutting blade of a cutting tool for prolonged use.
Many different methods have been tried to bond diamonds onto cutting tools. For example, U.S. Pat. No. 3,162,187 teaches the use of a tungsten or tungsten carbide of a suitable mesh which is impregnated with diamonds into the mesh. The diamond impregnated matrix is positioned on opposite sides of a steel reinforcing member and the steel reinforcing member is placed into a furnace at a preselected temperature for bonding the diamond impregnated matrix to the steel insert. The finished insert is then inserted into an appropriate groove in a cutting tool wherein the steel-tungsten-diamond insert is brazed in place.
U.S. Pat. No. 3,122,030 teaches a method of assembling a rotary saw blade with peripheral diamond teeth wherein the cutting part consists of a metallic matrix with crushed or fragmented diamonds distributed substantially uniformly through the matrix. The matrix is sandwiched between two steel lugs which are bonded to a tooth of a saw blade.
U.S. Pat. No. 3,110,579 also teaches a diamond tipped saw blade wherein the cutting elements of the saw blade are composed of a diamond grit embedded and dispersed in a matrix material, such as a mixture of bronze and iron. The cutting element is inserted into a groove in the blade with the diamond cutting element being bonded into the grooves.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved cutting tip for cutting tools.
It is another object of the present invention to provide an improved diamond cutting tip for cutting tools.
It is even another object of the present invention to provide an injection molded carbide insert for a cutting tool.
It is a further object of the present invention to provide an injection molded carbide insert for a cutting tool having two recesses of preselected size on opposite sides of the insert, one receiving an edge of a cutting blade of a cutting tool and the other recess receiving a diamond cutting tip.
More particularly, the present invention provides a method of making a cutting blade insert for a cutting tool comprising steps of:
preparing a mixture including a spray-dried hard refractory compound;
transferring said mixture to a molder;
injection molding said mixture to a preselected cutting blade insert shape including a first recess for a cutting tip and a second recess for attaching to a cutting tool;
sintering said cutting blade insert;
placing a cutting tip in said first recess; and,
brazing said cutting tip in said first recess.
Preferably, the cutting tip is a diamond cutting tip and the mixture for the molder contains tungsten carbide with a cobalt binder.
It is to be understood that the description of the examples of the present invention given hereinafter are not by way of limitation and various modifications within the scope of the present invention will occur to those skilled in the art upon reading the disclosure set forth hereinafter.
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Brutscher David
Pennington, Jr. Donald C.
Shumaker Carl
Viswanadham Ramamurthy K.
Credo Tool Company
Hughes Thomas
Jimenez Marc
Lamb Charles G.
Middleton & Reutlinger
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