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US 5,314,512 AGranted
Abrasive tool
OwnerJohn S. Sextoninventor
Life of this patent
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Abstract
An abrasive tool such as a grinding wheel or a saw is characterized by the working portion comprising a mass of ultra-hard abrasive particles dispersed in a non-porous thermoplastic polymer matrix. Examples of suitable thermoplastic polymers are polyetheretherketone, polyaryletherketone, poly (amide-imide), polyphenylene sulphide, liquid crystal polymer and mixtures thereof.
Claims8
A method for preparing an injection molded saw segment comprises the steps of:
- (a) heating a mass of ultra-hard abrasive particles dispersed in a non-porous thermoplastic polymer matrix in the barrel of an injection molding machine at a temperature of from about 280.degree. to 400.degree. C., wherein the abrasive content of the segment is at least 4 volume percent;
- (b) injecting said heated product of step (a) into a mold at a pressure of from about 70 MPa to 150 MPa;
- and
- (c) maintaining said injected product of step (b) in said mold at a pressure of about 35 MPa to about 75 MPa for a period of from about 2 to about 10 seconds.
1 more element
Dependencies are inferred from the claim text.