Toggle type precise cold die forging machine and die forging method thereof

Abstract

The invention belongs to the technical field of die forging machines, and discloses a toggle type precise cold die forging machine which comprises a body, a guide column, a lower die and an upper die. An oil cylinder is movably hinged to the right side of the inner wall of the body; a connector is fixedly installed at the telescopic end of the oil cylinder; a supporting rod and a transmission rod are movably hinged to the interior of the connector; the bottom end of the transmission rod is movably connected with a moving plate through a connector; and the top end of the supporting rod is movably connected with a supporting plate through a connector. A contact column drives a connecting rod to rotate in the moving process, so that a moving block and a magnet are driven to move downwards synchronously; when a spring is compressed to the limit, the distance between the moving block and the magnet is just enough for a magnetic attraction fixed distance, so that after the impact inertia of the oil cylinder is absorbed by the spring, dynamic stress balance with the spring is maintained through magnetic attraction fixing force between the magnet and a transmission column, the spring is prevented from rebounding rapidly after absorbing energy, and the stability of the upper die and the lower die in the machining process is maintained.

Description

technical field [0001] The invention belongs to the technical field of die forging machines, in particular to a toggle-type precision cold die forging machine and a die forging method thereof. Background technique [0002] Knuckle-joint precision cold die forging machine refers to the forging workpiece for cold processing. The pressure from the oil cylinder is transmitted to the die by means of a toggle-joint connecting rod, and then the workpiece is forged and formed. It has small margin and high processing accuracy. High advantages, and the toggle type adopts a crank-like interlocking structure to amplify the pressure of the oil cylinder by 1.5 times, which is beneficial to the processing of the die forging machine. [0003] At present, the toggle type precision cold die forging machine adopts the toggle type and uses the crank connecting rod to transmit the pressure of the oil cylinder to amplify the pressure to complete the final forming of the workpiece, but the impact ...

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Problems solved by technology

[0003] At present, the toggle type precision cold die forging machine adopts the toggle type and uses the crank connecting rod to transmit the pressure of the oil cylinder to amplify the pressure to complete the final forming of the workpiece, but the impact force of the oil cylinder is also amplified when the pressure is amplified , resulting in excessive impact inertia at the die end, which is prone to damage to the die, and the existing spring shock absorber cannot digest itself after absorbing energy, thus destroying the stability in the die forging process

[0004] At the same time, the existing toggle-joint precision cold forging machine also has the disadvantage of short stroke while increasing the forging pressure. When forging workpieces that require different strokes, it is necessary to adjust the extension length of the oil cylinder. During the elongation process of the telescopic end, the force arm also elongates, resulting in a loss of the output of the die forging pressure, and a large pressure output gap will be generated for the die forging workpiece with a similar stroke, which will affect the final forming effect of the workpiece

[0005] In addition, due to the structure of the toggle transmission, the connecting rod used for support will continue to be subjected to pressure from the oil cylinder, while the connecting rod driving the upper mold will receive less force, resulting in an unbalanced force between the two connecting rods. Easy to reduce the service life of the connecting rod

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