Process for broaching of grooves
AssigneeMotoren- und Turbinen-Union Munchen GmbH
InventorsDieter Lipowsky, Karl Meyle
Life of this patent
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Abstract
A series of adjacent grooves with mutually equal pitch are produced by a broaching process wherein two adjacent grooves are simultaneously produced in one broaching stroke by means of two broaching tools, one of which performs the preliminary broaching of a first groove and the other of which performs the finish broaching of a second groove which was preliminarly broached on a previous stroke. A preferred device for execution of the process is formed by utilization of a broaching girder which secures a T-shaped supporting strip, and wherein two tools, one a preliminary broaching tool and the other a final broaching tool, are secured in the angular position of the pitch of the grooves to be produced between respective sides of the T-shaped supporting strip and claws of the broaching girder.
Claims12
A process for production of a series of circumferentially adjacent retaining grooves for turbine blades in the peripheral surface of a rotor plate for a turbine engine by broaching, said retaining grooves being inclined with a predetermined pitch relative to the longitudinal axis of the rotor plate and being spaced from each other at a predetermined distance comprised by the simultaneous broaching of two adjacent retaining grooves in one broaching stroke by means of two broaching tools positioned relative to each other at the distance and in the angular position of the pitch of the grooves that are to be produced.
A process for production of a series of circumferentially adjacent grooves in the peripheral surface of a rotatable workpiece comprising the steps of:
- (a) broaching a first partially formed groove with a preliminary broaching tool;
- (b) repositioning the workpiece relative to the preliminary broaching tool;
- and
- (c) in all subsequent broaching steps, simultaneously broaching a further partially formed groove with said preliminary broaching tool and finish broaching a partially formed groove that was broached in a preceding step with a finishing broaching tool that is larger than said preliminary broaching tool in at least one cutting dimension.
A process for production of a series of circumferentially adjacent grooves in the peripheral surface of a rotatable workpiece by broaching, said grooves being inclined with a predetermined pitch relative to the longitudinal axis of the workpiece and being spaced from each other at a predetermined distance, comprised by the simultaneous broaching of two adjacent grooves in one broaching stroke by means of two broaching tools positioned relative to each other at the distance and in the angular position of the pitch of the grooves that are to be produced.
A groove broaching device for producing a series of circumferentially adjacent grooves of equal pitch in the curved peripheral surface of a rotatable workpiece comprising a T-shaped supporting strip having surfaces contoured to receive two broaching tools, means to fasten said supporting strip on a tool carriage including a broaching girder, two tool receiving chambers being formed between said girder and said surfaces of the T-shaped strip, and means to clamp a broaching tool in each of said chambers.
Dependencies are inferred from the claim text.