Synchronous control system of extruding cylinder and extruding plug for reverse extruder

Abstract

The invention relates to the field of machining, in particular to a synchronous control system of an extruding cylinder and an extruding plug for a reverse extruder. The synchronous control system is characterized by comprising the extruding cylinder, a moving cylinder, the plug and a two-stage back pressure valve, wherein the extruding cylinder and the plug are positioned on the same axis; relative surfaces of the plug and the extruding cylinder are provided with circular protruded stepped surfaces; a circular concave stepped surface corresponding to the circular protruded stepped surface of the plug is arranged in the extruding cylinder; the other end of the circular protruded stepped surface of the plug is coaxially connected with a driving mechanism; an oil cavity of the extruding cylinder is communicated with an oil path of the two-stage back pressure cavity; the driving mechanism drives the plug to move towards the direction of the extruding cylinder, so that the circular protruded stepped surface of the plug is combined with the circular concave stepped surface of the extruding cylinder, and then two-stage back pressure valve applies one inverse force to the extruding cylinder. The synchronous control system is not influenced from the environment and the pressure change of the system and can ensure that the relative movement between the extruding cylinder and the extruding plug is completely avoided.

Description

Technical field [0001] The invention relates to the field of machining, and is a synchronous control system of an extrusion cylinder and an extrusion plug for an inverted extruder. Background technique [0002] During the reverse extrusion process of the hot metal billet, the synchronous movement of the extrusion cylinder and the extrusion plug must be ensured, otherwise it may cause: (1) Hot metal flows out from the joint surface of the extrusion cylinder and the plug to form a large cap , Making it difficult to continue the extrusion process; (2) The hot metal and the inner wall of the extrusion cylinder generate friction and heat, causing the extruded product to overheat and the inner wall of the extrusion cylinder to wear and damage. At present, the synchronous control of the extrusion barrel and the extrusion plug of the foreign inverse extrusion machine mostly adopts the electro-hydraulic proportional synchronous follow-up control. The displacement sensor is installed on th...

AI Technical Summary

Problems solved by technology

[0002] During the reverse extrusion process of the hot metal ingot, it is necessary to ensure the synchronous movement of the extrusion cylinder and the extrusion plug, otherwise it may cause: (1) hot metal flows out from the joint surface of the extrusion cylinder and the plug to form a large cap , making it difficult to continue the extrusion process; (2) The hot metal and the inner wall of the extrusion cylinder generate friction and heat, causing overheating of the extruded product and wear and tear on the inner wall of the extrusion cylinder

At present, the synchronous control of the extrusion cylinder and the extrusion plug of the foreign reverse extrusion machine mostly adopts the electro-hydraulic proportional synchronous follow-up control, and the displacement sensors are respectively installed on the extrusion cylinder and the extrusion plug to measure the displacement per unit time. To detect and adjust its motion speed through a proportional valve to achieve follow-up synchronization. This method is complex to control and high in cost. In the actual production process, it is greatly affected by changes in ambient temperature and system pressure, and its relative accuracy is relatively poor. Movement cannot be eliminated, and frictional heating is unavoidable

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