A high-speed broaching machine hydraulic control system

Abstract

The invention discloses a high-speed broaching machine hydraulic control system. A main oil cylinder broaching oil supply oil way is connected between a broaching pump outlet and a main directional control valve. A main oil cylinder return oil supply oil way is connected between a return pump outlet and the main directional control valve. An upper cavity and a lower cavity of a main oil cylinder communicate with the main directional control valve. A main oil cylinder oil return oil way is connected between the main directional control valve and an oil tank. An oil filling and draining port of an energy accumulator valve group is connected to the main oil cylinder broaching oil supply oil way. A first control valve group used for connecting or disconnecting the main oil cylinder broaching oil supply oil way is connected between the oil filling and draining port of the energy accumulator valve group and the main directional control valve. A second control valve group used for connecting or disconnecting the main oil cylinder return oil supply oil way is connected with the main oil cylinder return oil supply oil way. According to the high-speed broaching machine hydraulic control system, an energy accumulator and a broaching pump are connected in parallel to supply oil to the broaching operation stroke of the main oil cylinder; and on the premise that the surface smoothness is ensured, the broaching speed can reach 63 meter / min or more, and accordingly the defect that a part subjected to nitrogen heat treatment is too high in surface hardness and consequently the part cannot be subjected to broaching is overcome.

Description

technical field [0001] The invention relates to hydraulic transmission and control technology, in particular to a hydraulic control system for a high-speed broaching machine. Background technique [0002] The broaching machine is a kind of broaching machine tool. The working principle of the pull-up broaching machine is: the clamping tool does not move, the processing part is clamped on the main slide plate, and the processing part moves upward for broaching. The broaching machine in the prior art is the most The fastest broaching speed is only about 8 m / min, and it is required that the surface of the parts must not be hardened and heat treated before broaching. With the development of social productivity, people have higher and higher requirements for products. Now people require parts to be nitrided After the heat treatment, the surface hardness of the processed surface can still be broached at HRC50 degrees. The inventor has verified through a large number of experiments ...

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Problems solved by technology

[0002] The broaching machine is a kind of broaching machine tool. The working principle of the pull-up broaching machine is: the clamping tool does not move, the processing part is clamped on the main slide plate, and the processing part moves upwards for broaching. The broaching machine in the prior art is the most The fastest broaching speed is only about 8 m / min, and it is required that the surface of the parts must not be hardened and heat treated before broaching. With the development of social productivity, people have higher and higher requirements for products. Now people require parts to be nitrided After the heat treatment, the surface hardness of the processed surface can still be broached at HRC50 degrees. The inventor has verified through a large number of experiments that the broaching speed of the broaching machine can reach the technical requirements when it is about 63 meters per minute. No machined parts form high hardness after nitriding heat treatment Hydraulic system of high-speed broaching machine

In the prior art, there is currently no relevant description about high-speed broaching machines. Chinese patent CN201120193516.4 discloses a hydraulic system for a pull-up internal broaching machine, which uses a programmable controller to control the proportional flow valve and proportional pressure valve to realize The stepless speed change of the broaching cylinder does not mention how to meet the processing of parts with high surface hardness

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