CS245879B1 - Cylinder with elastic surface - Google Patents

Description

The invention relates to a roll having an elastic surface, the outer surface of which is provided with an elastic polyurethane cushion intended especially for bending machines.

Known are solutions of cylinders with an elastic polyurethane cushion formed in the form of a solid surface of the same hardness, or composed of bushes pressed and glued or vulcanized to the metal surface of the roll, or also double-layer cushions, the outer layer being polyurethane having a hardness greater than inside. All of these solutions are characterized by the fact that in the case of uneven wear or breakage of the cushion at one location, the first type of cushions requires replacement of the whole cylinder provided with an elastic cushion, the second type of cushions composed of rings pressed and glued to the metal roller. the ring, whereby the majority is no longer usable, since the metal serrated or grooved surface will damage the inner contact surface of the rings during contraction. A similar disadvantage is the third solution when the cushion is bilayered. Making the smooth surface of the metal cylinder and crimping polyurethane castings of lesser thickness did not produce satisfactory results, because the gradual operation of the machine releases the crimped bushings a. there is a rotation on the metal surface of the roller, whereby the cushion ceases to perform its function, transmitting the necessary torque to the second non-driven machine cylinder.

The above-mentioned drawbacks of cylinders covered with an elastic cushion eliminate the solution according to the invention, which consists in that the cylinder with elastic surface consists of a metal core on which the metal sleeves are alternately pushed, on the outer cylindrical flat provided with notches and vulcanized polyurethane rings. and metal rings, the cylinder ends being closed by flanges. The rigid connection of the sleeves provided with the polyurethane rings with the metal core of the cylinder is transferred by connecting elements, preferably tongues. The thickness of the vulcanized polyurethane rings on the metal sleeves is the same and is equal to five to six times the depth of deformation of the elastic surface of the cylinder when retracted, and the length of each ring is 1.5 times the depth of the cushion. Each ring is provided on the outer surface with two equally spaced grooves of depth equal to half the depth of the cushion. The individual polyurethane rings vulcanized to the sleeves are separated by metal rings of a thickness equal to the width of the grooves on the surface of the polyurethane rings.

The solution of the roll with the elastic surface according to the invention achieves in addition to simple assembly and disassembly of parts, replaceable wear rings for new ones, while unused wear can be fitted, cost savings on polyurethane castings, reduced weight, reduced assembly and disassembly effort, thereby reducing machine. From the gas solution, there are also secondary savings, which arise from the fact that the assembly and disassembly of the parts does not require any jigs and a die-casting press, which represents further time and cost savings. The metal core of the roll is designed universally and can serve different design types of elastic cushions of different hardness, thereby greatly expanding the technological possibilities of the bending machine.

An exemplary construction of an elastic surface roller according to the invention is shown in the accompanying drawings, in which: FIG. 1 is a partial longitudinal cross-sectional view of a roll having an elastic surface, and FIG. 2, cross-section A-A of FIG. 1.

The roller with the elastic cushion of FIG. 1 and 2 consists of a metal core 1, on which the metal sleeves 2 are alternately slid, on the outer cylindrical flat 22 provided with indentations and vulcanized rings 3 of polyurethane and metal rings 4, the ends of the cylinder being closed by flanges 5. The thickness H of the vulcanized polyurethane rings 3 is five to six times the depth of the cushion on retraction and the length L is equal to one and a half of the depth of the cushion H, each ring 3 being provided on the outer surface with two evenly spaced grooves of width b and depth h equal to half the depth H of the cushion. The individual polyurethane rings 3 vulcanized to the metal sleeves 2 are separated by rings 4 with a thickness m equal to the width b of the recess on the surface of the polyurethane rings 3.

The roll with an elastic surface is designed primarily for double-roll bending machines, but can also be used as a lower feed roller for four-roll bending machines.

Claims (4)

Roller with an elastic surface formed by n rings and a metal core, characterized in that metal sleeves (2J) are alternately pushed onto the metal core (1) on the outer cylindrical flat (22) provided with scoring and vulcanized rings (3j) made of polyurethane and metal rings (4j), the ends of the cylinder being closed by flanges (5). Roller with elastic surface according to claim 1, characterized in that the rigid connection of the metal sleeves (2) provided with the polyurethane rings (3) with the metal cylinder core (1) is transferred by connecting elements, preferably by tongues (6). Roller with elastic surface according to bovynAlez du 1, characterized in that the rings (3) of polyurethane have a depth (H) equal to six times the depth of the deformation of the surface when retracted and a length (L) equal to one and half the depth (H) of the cushion. each polyurethane ring (3) is provided on the outer surface with two evenly spaced grooves of depth (h) equal to half the depth (H) of the cushion. Roller with elastic surface according to points 1 to 3, characterized in that the individual rings (3) of polyurethane vulcanized on metal sleeves (2) are separated by rings (4) of thickness (m) equal to the groove width (b) on the outer surface of the rings (3) of polyurethane.