Saw frame feeding system with constant saw cutting force and variable feeding speed and saw frame feeding method

Abstract

The invention discloses a saw frame feeding system with the constant saw cutting force and the variable feeding speed and a saw frame feeding method. The system consists of a saw frame, a hydraulic system and a control system, wherein the saw frame is arranged on a sawing machine through double upright posts and is driven by an oil cylinder to vertically move along the upright posts. The control system is in a multilayer multi-machine cooperative hardware system structure, real-time/non-real-time tasks are allocated to each processing unit according to the types, and the reliability of the system is improved through a hard logic gate circuit. According to workpiece cross section types and parameters selected by operators, the system implements the variable feeding speed feed forward control on the basis of the workpiece saw cutting width variable by combining the measured saw frame displacement and the workpiece material hardness. The constant saw cutting force closed loop feedback feeding control is carried out according to oil cylinder oil pressure value collected by a pressure sensor, the quality of saw cutting workpieces and the work efficiency of the sawing machine are improved, and the saw blade consumption is reduced. Through the adoption of control strategies of customized cutting-in and cutting-out feeding and fast ascending reset of the saw frame, the solution of thesaw frame feeding control system is more prefect.

Description

technical field [0001] The invention relates to a saw frame feed system of a horizontal metal band sawing machine, in particular to a saw frame feed system with constant sawing force and variable feed speed and a method thereof. Background technique [0002] Compared with the all-round continuous improvement design of metal processing machine tools such as turning, milling, boring, grinding, inserting, drawing, and forging, the sawing machine has not received due attention for a long time. On the contrary, it is considered to be a simple metal processing equipment for cutting and blanking. . At present, the dual constraints of the environment and resources are two major problems that must be given priority when developing the economy; the rapid rise of precision casting and precision forging is largely due to the excellent performance in the "two major problems"-- Resource conservation and environmental friendliness: the consumption of metal raw materials is reduced, and th...

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Problems solved by technology

[0003] Domestic sawing machines have made great progress, but compared with similar products in developed countries, there is a big gap in terms of technical indicators and added value

There are three reasons for the current situation of my country's sawing machine industry being large but not strong: first, the overall scientific and technological strength is not as good as others; Troubled by the traditional concept of "chicken head, not oxtail"--The high-efficiency sawing machine industrial cluster based on the specialized division of labor and supporting system has long-term difficulties in production--All sawing machine manufacturers are keen on mainframes and compete with each other at low prices by "cloning"

[0011] The above-mentioned useful explorations put forward the idea of ​​adjusting the feed speed for constant power sawing when the cross-sectional size and shape of the workpiece change, which has certain reference value, but there are still limitations in the exploration results: The special working conditions of the cut-in and cut-out work; the saw frame needs to be quickly raised and reset after the workpiece is sawed, and the cross-sectional surface of the sawed material and the sawtooth surface will produce instantaneous severe friction, and the countermeasures are lacking; in view of the fact that there is no direct To find a reliable and affordable method of collecting sawing force, the above-mentioned researchers turned to detecting the tension of the saw blade, but there is no one-to-one correspondence between the tension of the saw blade and the cutting force, that is, the method of detecting the tension of the saw blade itself is Feasible, but the derived sawing force has inherent flaws; therefore, it is necessary to do in-depth research and innovation on the basis of existing research results

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