Supported shear with reversible drive and method of operating same
OwnerJohn J. Borzyminventor
Life of this patent
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Abstract
A reversible linear hydraulic drive system for a bidirectional supported shear having an adjustable stroke length. A method for improving the quality of the tube ends after shearing using a reversible partial orbital path is also disclosed.
Claims12
In a supported shear of the type in which axially adjacent and integral lengths of linear stock such as tubing are laterally displaced relative to one another along a shear plane at right angles to the longitudinal axis of said stock:
- non-driven ram means for receiving and holding said stock;
- driven ram means adjacent the non-driven ram means for receiving said stock;
- and
- means for alternately driving said moveable ram in opposite directions through an orbital path relative to the non-driven ram.
For use in combination with a bladeless shear for linear stock which shear comprises a stock-receiving ram having an eccentrically driven wheel disposed therein, a wheel drive comprising:
- a drive shaft connected to said wheel;
- a pinion connected to said shaft for rotation therewith;
- first and second racks engaging said pinion and linearly translatable to rotate the pinion in respective first and second opposite directions;
- and
- power means for translating said racks.
In a bladeless shear device of the type having first and second tools aligned with a work piece axis and means for causing orbital motion of one of the tools relative to the other;
- an actuator having a linearly translating drive component;
- and
- means for converting the linear translation of the drive component into orbital motion of said one tool.
A method for shearing tubular stock using a bladeless supported shear of the type having fixed tooling for receiving the stock, adjacent orbitally moveable tooling for receiving the stock and a mandrel for disposition within the tooling when in the area of the fixed and moveable tooling, the method comprising the steps of:
- a. driving the moveable tooling from a home position through an incomplete orbital path comprising between about 200° and 270° of a full orbital path, and, thereafter,
- b. driving the orbital tooling in the reverse direction back to the home position.
A method of shearing tubular stock having a known wall thickness using a device having a fixed tool having a center, an adjacent, orbitally moveable tool having a center and a mechanism for adjusting the amount of displacement between the centers of the fixed and orbitally moveable tools during a shearing operation comprising the steps of:
- a. adjusting the device so that the aforesaid tooling center displacement is only marginally greater than the wall thickness of the stock;
- b. driving the moveable tooling in one direction from an original position through no more than about 270° of orbital travel;
- and, thereafter,
- c. driving the orbital tooling in the reverse direction back to its original position.
A supported shearing apparatus comprising:
- a. a fixed tool for receiving a tubular workpiece,
- b. a moveable tool immediately adjacent the fixed tool for receiving a tubular workpiece;
- c. means for collocating the center lines of the fixed and moveable tools to define a home position and for varying the degree of displacement between the fixed and moveable centers during an orbital movement of the moveable tool;
- d. a first hydraulic power source for driving the moveable tool in one direction;
- and
- e. a second hydraulic power source for moving the moveable tool in the opposite direction.
Dependencies are inferred from the claim text.