Broach manufacturing method
AssigneeColonial Tool Operations Division of Textron Canada Limited
InventorIan R. S. Reid
Life of this patent
Estimating the term…
Abstract
A broach or other tool having a plurality of cutting teeth along its length is produced by simultaneously grinding a plurality of preformed cutting teeth having overside dimensions, such as oversize outer diameters, using a rotating dressed generally cylindrical grinding wheel engaging the oversize teeth along a length of the broach preform to impart reduced final print dimensions such as final outer diameters to the oversize teeth. Outer diameters which increase from one tooth to the next and outer diameters which remain constant for several adjacent teeth can be simultaneously ground. Different clearance angles can also be imparted during the grinding operation.
Claims18
A method for making a tool having a length along which multiple cutting sections, each having a plurality of cutting teeth, are disposed comprising:
- (a) rotatably supporting a tool preform having said multiple cutting sections along the length of the preform with each cutting section including a plurality of cutting teeth disposed along the length of each cutting section and having oversize dimensions, and
- (b) simultaneously grinding the plurality of cutting teeth of all of said cutting sections with a rotating grinding wheel to impart reduced final dimensions to the cutting teeth with the reduced final dimension of one or more of the cutting teeth being different from the reduced final dimension of another one or more of the cutting teeth along said length, said grinding being effected by relatively engaging the rotating grinding wheel and said cutting teeth of the preform with the grinding wheel dressed to provide respective grinding surfaces along its length having different dimensions to impart the reduced final dimension to said one or more of the cutting teeth and the different reduced final dimension to said another one or more of the cutting teeth.
A method for making an elongated broaching tool having a length along which a plurality of first teeth in a first cutting section are disposed followed by a plurality of second teeth in a second cutting section, comprising the steps of:
- (a) rotatably driving a broach preform having
- (1) said first cutting section with a plurality of said first teeth disposed along the length of said first cutting section and having oversize outer diameters and (2) said second cutting section with a plurality of said second teeth disposed along the length of said second cutting section and having oversize outer diameters,
- (b) simultaneously grinding the plurality of first teeth of said first cutting section and the second teeth of said second cutting section using a rotating grinding wheel to impart reduced final outer diameters to the first and second cutting teeth with the reduced final outer diameter of one or more of the first teeth being greater than the reduced final outer diameter of one or more of the second teeth, said grinding being effected by relatively engaging the rotating grinding wheel and said length of the preform with the grinding wheel dressed to provide respective first tooth grinding surfaces and second tooth grinding surfaces along its length having different dimensions to impart the reduced final outer diameter to said one or more of the first teeth and the greater reduced final outer diameter to said one or more of the second teeth.
The method of claim 13 wherein the grinding step (b) includes imparting a clearance angle to each of the first teeth and a clearance angle to each of the second teeth.
Dependencies are inferred from the claim text.