Metal bending machine

A metal bending machine for bending a plurality of metal workpieces having various lower cross-sectional profiles, and having various upper cross-sectional profiles, the plane of each such cross-sectional profile being perpendicular to the longitudinal axis of the workpiece;

• which metal bending machine comprises:
• A lower pinchroller drive shaft having a channel along its length, the channel extending radially inward from the lower pinchroller drive shaft's exterior radial surface, and the midline of the channel being parallel to the lower pinchroller drive shaft's central radial axis;
• A means of fixedly and rotatably mounting the lower pinchroller drive shaft so that its central radial axis remains in a fixed position, and so that the lower pinchroller drive shaft may rotate about its central radial axis, wherein said means comprises a plurality of lower pinchroller bearing supports, each lower pinchroller bearing support being fixedly attached to a pinch roller table, each lower pinchroller bearing support having an aperture therethrough, each such aperture containing and retaining a lower pinchroller bearing, the interior diameter of each lower pinchroller bearing being closely fitted to the diameter of the lower pinchroller drive shaft, the lower pinchroller bearing supports being positioned and aligned upon the pinchroller cable so that the central radial axes of the lower pinchroller bearings coincide with the central radial axis of the lower pinchroller drive shaft, the lower pinchroller drive shaft being rotatably mounted within and through the lower pinchroller bearings;
• A plurality of lower pinchroller discs, each lower pinchroller disc having a circular aperture therethrough, the central radial axis of the circular aperture coinciding with the central radial axis of the lower pinchroller disc, the diameter of the circular aperture being closely fitted to the diameter of the lower pinchroller drive shaft, the interior radial surface of the circular aperture having a ridge extending radially inward, the midline of the ridge being parallel with the central radial axis of the lower pinchroller disc, and the dimensions of the ridge being fitted to allow the ridge to lie within the channel of the lower pinchroller drive shaft;
• each lower pinchroller disc being slidably mounted over the lower pinchroller drive shaft so that the lower pinchroller drive shaft passes through the circular apertures of the lower pinchroller discs, so that the ridges within the apertures of the lower pinchroller discs lie within the channel of the lower pinchroller drive shaft, and so that the lower pinchroller discs are stacked in close contact with each other;
• a plurality of the lower pinchroller discs which are slidably mounted over the lower pinchroller drive shaft having annular channels within their exterior radial surfaces, the radial cross-sectional profiles of each such annular channel being closely fitted to a portion of the lower cross-sectional profile of a workpiece to be bent, so that upon slidable mounting of the lower pinchroller discs over the lower pinchroller drive shaft, a lower pinchroller is formed, the exterior radial surface of the lower pinchroller having annular channels therearound, the radial cross-sectional profiles of the channels being respectively closely fitted to the lower cross-sectional profiles of the workpieces to be bent;
• An upper pinchroller drive shaft having a channel along its length, the channel extending radially inward from the exterior radial surface of the upper pinchroller drive shaft, and the midline of the channel being parallel to the central radial axis of the upper pinchroller drive shaft;
• A means of vertically adjustably and rotatably mounting the upper pinchroller drive shaft so that it may rotate about its axis, and so that it may travel from a first position wherein it lies above and in close proximity with the lower pinchroller, and wherein it is in alignment with the lower pinchroller, to a second position wherein the upper pinchroller drive shaft is substantially vertically above the first position, wherein said means comprises a plurality of support columns fixedly attached to and extending vertically upward from the pinchroller table;
• a fixed crossbeam fixedly attached to and interconnecting the upper ends of the support columns, the fixed crossbeam being positioned to overlie the lower pinchroller, the longitudinal axis of the fixed crossbeam being substantially parallel with the central radial axis of the lower pinchroller, the fixed crossbeam having a first aperture extending vertically therethrough and a second aperture extending vertically therethrough, the first aperture being positioned to overlie the left end of the lower pinchroller, and the second aperture being positioned to overlie the right end of the lower pinchroller;
• a first threaded nut being fixedly attached to the lower surface of the fixed crossbeam and positioned so that the bore of the first threaded nut is aligned with the first aperture;
• a second threaded nut being fixedly attached to the lower surface of the fixed crossbeam and positioned so that its threaded bore is aligned with the second aperture;
• the first threaded nut having rotatably mounted therethrough a first threaded shaft;
• the second threaded nut having rotatably mounted therethrough a second threaded shaft, the upper ends of the first and second threaded shafts extending above the upper surface of the fixed crossbeam, each such upper end having a turnwheel fixedly attached thereto, and the lower ends of the first and second threaded shafts extending below the lower surfaces of the first and second threaded nuts;
• a ram support crossbeam pivotally attached to and interconnecting the lower ends of the first and second threaded shafts, the left and right ends of the ram support crossbeam being slidably guided and supported by left and right vertical adjustment track braces, the left and right vertical adjustment track braces being fixedly attached to the lower surface of the fixed crossbeam and extending vertically downward therefrom;
• a left and a right hydraulic ram, the left and right hydraulic rams being pivotally attached to the lower surface of the ram support crossbeam, the left hydraulic ram being positioned so as to overlie the left end of the lower pinchroller and the right hydraulic ram being positioned to overlie the right end of the lower pinchroller;
• the left and the right hydraulic rams each having a hydraulic ram shaft extending vertically downward therefrom;
• a pinchroller support crossbeam pivotally attached to and interconnecting the lower ends of the hydraulic ram shafts of the left and right hydraulic rams, the left and right ends of the pinchroller support crossbeam being slidably guided and supported by the left and right vertical adjustment tracks;
• and a plurality of upper pinchroller bearing supports, each upper pinchroller bearing support being fixedly attached to the lower surface of the pinchroller support crossbeam, each upper pinchroller bearing support having an aperture therethrough, each aperture containing an upper pinchroller bearing whose interior diameter is closely fitted to the diameter of the upper pinchroller drive shaft;
• the upper pinchroller drive shaft being rotatably mounted within and through the upper pinchroller bearings, manual rotation of the first and the second threaded shafts in combination with hydraulic actuation of the left and right hydraulic rams allowing the position of the upper pinchroller with respect to the lower pinchroller to be multiply adjustable;
• A plurality of upper pinchroller discs, each upper pinchroller disc having a circular aperture therethrough, the central radial axis of the circular aperture coinciding with the central radial axis of the upper pinchroller disc, the diameter of the circular aperture being closely fitted to the diameter of the upper pinchroller drive shaft, the interior radial surface of the circular aperture having a ridge extending radially inward, the midline of the ridge being parallel with the central radial axis of the upper pinchroller disc, and the dimensions of the ridge being fitted to lie within the channel of the upper pinchroller drive shaft;
• each upper pinchroller disc being slidably mounted over the upper pinchroller drive shaft so that the upper pinchroller drive shaft passes through the circular apertures of the upper pinchroller discs so that the ridges within the apertures of the upper pinchroller discs lie within the channel of the upper pinchroller drive shaft, and so that the upper pinchroller discs are stacked in close contact with each other;
• a plurality of the upper pinchroller discs which are slidably mounted over the upper pinchroller drive shaft having annular channels within their exterior radial surfaces, the radial cross-sectional profile of each such annular channel being closely fitted to a portion of the upper cross-sectional profile of a workpiece to be bent, so that upon slidable mounting and stacking of the upper pinchroller discs over the upper pinchroller drive shaft an upper pinchroller is formed, the exterior radial surface of the upper pinchroller having annular channels therearound, the radial cross-sectional profiles of the channels being respectively closely fitted to the upper cross-sectional profiles of the workpieces to be bent, each such annular channel being positioned upon the upper pinchroller to overlie the corresponding channel within and around the lower pinchroller, and so that when the upper pinchroller drive shaft is in the first position, the upper and lower pinchrollers form pinch points respectively closely fitted to the upper and lower cross-sectional profiles of the workpieces to be bent;
• A means of counter-rotating the upper and lower pinchroller drive shafts and the upper and lower pinchrollers with respect to each other so that, when the upper pinchroller drive shaft is in the first position, and when a metal workpiece is inserted into a pinch point fitted to the workpieces' upper and lower cross-sectional profiles, the workpiece is forcefully driven forward through the pinch point from the front side of the upper and lower pinchrollers to the back side of the upper and lower pinchrollers along a line which is substantially tangent to the lower surface of the upper pinchroller, and to the upper surface of the lower pinchroller, wherein said means comprises an upper hydraulic motor and a lower hydraulic motor, the drive shaft of the upper hydraulic motor being fixedly attached to an end of the upper hydraulic motor drive shaft, and the drive shaft of the lower hydraulic motor being fixedly attached to an end of the lower pinchroller drive shaft;
• A radius roller axle;
• A means of vertically adjustably mounting the radius roller axle so that the radius roller axle may be positioned at various vertical heights with respect to the back side of the pinch points formed by the upper and lower pinchrollers, the central radial axis of the radius roller axle being substantially parallel to the radial axes of the upper and lower pinchrollers, wherein said means comprises a plurality of radius roller bearing supports, each radius roller support being fixedly attached to the pinchroller table, each radius roller bearing support having a threaded radius roller adjustment shaft rotatably and slidably mounted within a channel within the radius roller bearing support and through a threaded thumb wheel, the thumb wheel being rotatably mounted within the radius roller bearing support, the channel being aligned within the radius roller bearing support so that rotation of the thumb wheel may alternately raise and lower the radius roller adjustment shaft, the upper end of each radius roller adjustment shaft having a semi-circular radius roller bearing cradle fixedly attached thereto, each radius roller bearing cradle containing and retaining a radius roller bearing whose interior diameter is closely fitted to the diameter of the radius roller axle, the radius roller axle being rotatably mounted within and through the radius roller bearings, the vertical position of the radius roller being adjustable through manual rotation of the thumb wheels mounted within the radius roller bearing supports, causing the radius roller adjustment shafts to be raised or lowered, raising or lowering the radius roller;
• A plurality of radius roller discs, each having a circular aperture therethrough, the central radial axis of the circular aperture coinciding with the central radial axis of the radius roller disc, and the diameter of the circular aperture being closely fitted to the diameter of the radius roller disc;
• each radius roller disc being slidably mounted over the radius roller axle so that the radius roller axle passes through the circular apertures of the radius roller discs, and so that the radius roller discs are stacked in close contact with each other;
• a plurality of the radius roller discs which are slidably mounted over the radius roller axle having annular channels within their exterior radial surfaces, the radial cross-sectional profile of each such annular channel being closely fitted to a portion of the lower cross-sectional profile of a workpiece to be bent, so that upon slidable mounting of the radius roller discs over the radius roller axle, a radius roller is formed, the exterior radial surface of the radius roller having annular channels therearound, the channels being positioned upon the radius roller so that the planes containing the central circumferences of the channels of the lower pinchroller also contain the central circumferences of the corresponding channels of the radius roller, the channels of the radius roller being fitted to match the corresponding channels of the lower pinchroller, and so that when the upper pinchroller drive shaft is in the first position, when the radius roller axle is vertically positioned so that the upper surface of the radius roller is situated at an elevation higher than the upper surface of the lower pinchroller, when the upper and lower pinchrollers are counter-rotated by the counter-rotating means, and when a metal workpiece is driven forward through a pinch point formed by the upper and lower pinchrollers, the forward end of the metal workpiece may come into contact with the radius roller within a channel having a radial cross-sectional profile closely fitted to the lower cross-sectional profile of the workpiece, and upon such contact, and upon continuation of such forward driving of the metal workpiece, upward deflection of and progressive bending of the metal workpiece occurs.

The apparatus of claim No. 2 further comprising a hydraulic pump fixedly mounted beneath the pinch roller table;

• an electric motor fixedly mounted beneath the pinch roller table, the drive shaft of the electric motor being fixedly attached to the drive shaft of the hydraulic pump;
• a hydraulic oil reservoir fixedly mounted beneath the pinch roller table;
• a hydraulic tube connecting the hydraulic oil reservoir to the intake port of the hydraulic pump;
• a first network of hydraulic tubes connecting the hydraulic output port of the hydraulic pump to the left and right hydraulic rams and to the upper and lower hydraulic motors, the first network of hydraulic tubes passing through a series of lever controlled hydraulic valves for controlling the rate of flow and pressure of hydraulic oil from the hydraulic pump to the left and right hydraulic rams and to the upper and lower hydraulic motors;
• and a second network of hydraulic tubes extending from the hydraulic motors to the hydraulic oil reservoir for return flow of hydraulic oil.