A two-way precision hydraulic bar shearing machine and its shearing method

Abstract

The invention provides a double-direction precise hydraulic bar shearing machine and a shearing method of the machine. At the beginning of shearing, a moon arc notch is cut in the radial left side of a bar, a gap is cut in the hard layer of the radial surface, stress concentration and slight bar lattice slippage are generated, a shear switch issues an order to an oil cylinder immediately, the motion direction is reversed to the leftward movement, a rear cutter shears off the bar along the gap, and for example, when low-carbon steel is shorn, the radial pressure skewness is small, and burrs are few; and if high-carbon alloy steel is shorn, the center portion cannot be torn off. The double-direction precise hydraulic bar shearing machine comprises a sliding block, a front cutter portion, a rear cutter portion, a shear depth adjusting portion and a spring device. The front cutter portion is used for centering and clamping the bar and is mounted on a front lathe, and the front cutter portion comprises a left wedge, a left cutter table, an oil cylinder, a right wedge, a right cutter table, a screw and blades.

Description

technical field [0001] The invention relates to bar shearing, and in particular provides a two-way precision hydraulic bar shearing machine and a shearing method thereof. Background technique [0002] At present, the shearing of bars at home and abroad adopts one-way shearing, one-time shearing, large shearing radial flattening, non-vertical cross-section, large burrs, and special shearing of high-carbon alloy steel such as GCr15 (bearing steel). cracked or torn. In order to solve this problem, the current bearing steel is heated and sheared. This method not only increases the requirements for production equipment (need to be equipped with a heating furnace), but also makes the power consumption remain high (a shear machine cuts 1000 tons of material and consumes 20 10,000 degrees); if a sawing machine is used for blanking, and a shearing machine cuts 1000 tons of material, the loss of steel at the saw kerf reaches more than 40 tons, which is a huge waste. [0003] Wang Hu...

AI Technical Summary

Problems solved by technology

[0004] Through many tests so far, the reasons for the tearing of the heart are analyzed in three aspects: First: the friction clutch is affected by air pressure fluctuations and repeated startup of the friction plate, the friction plate heats up, and the friction coefficient of the friction plate changes due to heat, resulting in inaccurate parking , front and back, affecting the initial shear depth; second: the first two clamping wedges are not synchronized, and the feeding center will be changed; third: the screw rods at the front ends of the pistons of each cylinder are directly twisted into the driving parts, and the concentricity of the two cannot be controlled

Due to the above three reasons, the initial shear depth is seriously affected, so the steel core of the shear bearing is torn

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