Abstract A hollow open-ended frusto-conical forging having substantially uniform wall-thickness from end-to-end, for use as a reducer in pipe lines and the like, is made by first obtaining a hollow work-piece having a frusto-conical exterior surface and substantially cylindrical interior surface. This work-piece is heated to forging temperature and placed around a horizontally disposed cylindrical mandrel which is supported on the bed of a power press and the platen of the power press is pressed against the major portion of the work-piece which is internally supported by the mandrel to obtain a tapering reduction in the major portion of the work-piece thereat. The platen is then raised and the work-piece is partially rotated to position an immediately adjacent segment of the work-piece between the platen and mandrel. These steps are continued, with the intermediate raising of the platen and partial rotation of the work-piece until the inside and outside diameters of the work-piece are of acceptable dimensions throughout a 360* arc. The power press is then adjusted to increase the lowermost position of the platen with respect to the mandrel, and the steps described are repeated throughout a 360* arc as before. This is continued until the final hollow product with frusto-conical exterior and interior surfaces of the desired dimensions has been obtained.
Inventors
👤 C Moore
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-04 20:22
CPC Classifications
B; B21; B21K; B21K21/00; B21K21/08; B21K21/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
The process for making an open-ended; frusto-conical hollowforging having substantially uniform wall-thickness from end-toend for use as reducers in pipe lines and the like; which consists essentially of obtaining a work-piece of frusto-conical exterior and substantially uniform inside diameter from end-to-end heating the said work-piece to forging temperature placing the work-piece while heated to forging temperature on a horizontally extending cylindrical mandrel which is of smaller outside diameter than the inside diameter of the work-piece and while the mandrel is supported on the bed of a press pressing the platen of the press against the exterior of that portion of the work-piece which is internally supported by the mandrel raising the platen partially rotating the work-piece repeating the application of pressure and the raising of the platen while intermittently partially rotating the work-piece through 360* until the inside and outside diameters are of acceptable dimensions extending the adjustment of the platen toward the mandrel; and continuing the foregoing operational steps until the desired internal and external dimensions have been obtained.
Claim 2
Dependent Claim
170 words
The process for making an open-ended; frusto-conical hollowforging having substantially uniform wall-thickness from end-toend for use as reducers in pipe lines and the like; which consists essentially of obtaining a work-piece of frusto-conical exterior and substantially uniform inside diameter from end-to-end heating the said work-piece to forging temperature placing the work-piece while heated to forging temperature on a horizontally extending cylindrical mandrel which is of smaller outside diameter than the inside diameter of the work-piece and while the mandrel is supported on the bed of a press pressing the platen of the press against the exterior of that portion of the work-piece which is internally supported by the mandrel raising the platen partially rotating the work-piece repeating the application of pressure and the raising of the platen while intermittently partially rotating the work-piece through 360* until the inside and outside diameters are of acceptable dimensions extending the adjustment of the platen toward the mandrel; and continuing the foregoing operational steps until the desired internal and external dimensions have been obtained.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the exterior surface of the starting work-piece is machined on the outside to provide a frusto-conical surface prior to heating to forging temperature.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the initial work-piece is formed in a die.