A variable negative pressure chip extraction device

Abstract

The invention belongs to the technical field of chip suction in the deep hole machining process, and particularly relates to a variable-negative-pressure chip suction device. The variable-negative-pressure chip suction device aims at achieving periodic variation of flow in a negative pressure channel in a negative-pressure chip suction device, so that the negative pressure value changes periodically, and the chip breaking capacity and the chip removal capacity are improved. The variable-negative-pressure chip suction device comprises the negative-pressure chip suction device. A converter is installed inside the negative pressure channel of the negative-pressure chip suction device. A variable-pressure through hole in a rotating core of the converter is made to be communicated with a cutting fluid channel periodically, so that flow entering the negative pressure channel of the negative-pressure chip suction device periodically changes, the flow speed of a jet orifice changes accordingly, the negative pressure value of the negative pressure area periodically changes, and the difference of the pressure applied to two faces of chips of the cutting area and suction force on the chips are changed. Even though the chips are slightly blocked, the chip breaking and removal effects are effectively improved by changing the stress state.

Description

technical field [0001] The invention belongs to the technical field of chip removal in deep hole machining, and in particular relates to a variable negative pressure chip removal device. Background technique [0002] With the development of deep hole processing technology in the direction of high speed and high efficiency, the amount of chips will increase accordingly, and the problem of chip removal has become a major problem restricting the development of deep hole processing technology. In the process of deep hole machining, once the chips are blocked, the machining process will be suddenly interrupted, and even the phenomenon of knife beating will occur, which will affect the surface quality of the workpiece. [0003] The existing negative pressure chip removal device can generate negative pressure at the tail of the drill pipe, has a certain suction effect on chips, realizes active chip removal, and improves the chip removal effect to a certain extent. But because the ...

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Problems solved by technology

But because the negative pressure value is constant, the suction force is also constant. Once the chips are slightly blocked, the subsequent chips will continue to accumulate, and finally the chip removal channel will be completely blocked. Even if the negative pressure value and suction force are increased, it will not be improved. Its chip removal effect will also cause the waste of cutting fluid and increase the processing cost

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