Cutting Liquid Supply Device Gas Removal
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Solution Overview
Problem
The machine tool's cutting liquid supply system experiences delayed pressure increase due to gas accumulation in the supply line, leading to poor response in mist discharge, which affects product quality and can cause burn-in or damage, especially when the spindle is arranged vertically.
Innovation Solution
A cutting liquid supply device with a pressure sensor and an air vent device is implemented to measure pressure and open the supply line to atmospheric pressure when it falls below a threshold, ensuring efficient gas removal and improving mist discharge response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump supplies cutting liquid through a long supply line to reach the rotary joint, then the cutting liquid can reach the mist generation device, but gas accumulates in the high place of the supply line causing delayed pressure increase and poor response
Solution Approach 1:
The patent extracts and removes gas from the cutting liquid supply line using a gas separation device. The supply line is divided into a gas separation chamber where gas accumulates and is separated from the cutting liquid, preventing gas from reaching the pump and causing delays. This directly addresses the problem of gas accumulation causing poor response.
Solution Approach 2:
The patent introduces a vertical dimension to the supply line by creating a high place (gas separation chamber) above the rotary joint. Gas, being lighter than cutting liquid, naturally rises to this elevated position where it can be separated and removed, converting the horizontal supply problem into a vertical separation solution.
2Productivity
If the pump is stopped frequently to match spindle machining time, then energy is saved and machining is optimized, but gas accumulates in the supply line causing delayed pressure increase when restarted
Solution Approach 1:
The gas separation device is positioned to continuously separate gas from cutting liquid before the pump restarts. This preliminary removal of gas ensures that when the pump restarts after machining cycles, the supply line is already primed with liquid, eliminating delay and ensuring immediate pressure response.
3Reliability
If the air vent device is placed at the high place in the supply line, then gas can be effectively removed, but the device complexity increases
Solution Approach 1:
The gas separation device utilizes the natural buoyancy of gas in liquid and gravitational force to automatically separate and remove gas without requiring external power or complex control mechanisms. The high place design allows gas to rise and accumulate naturally, where it can be vented, making the system self-regulating and simple in operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively removes gas from the cutting liquid supply line, enhancing the machine tool's response time for mist discharge, thereby improving product quality and preventing damage by ensuring timely and consistent pressure regulation.
Implementation Method 1
a pressure sensor to measure a pressure of the cutting liquid supplied from the pump
Implementation Method 2
an air vent device to open and close the supply line to atmospheric pressure
Data Source
AI summary
A cutting liquid supply device in a machine tool is configured to remove gas mixed in a cutting liquid supply line to improve the response of discharging a mist of cutting liquid. Cutting liquid is supplied from a pump (42) through a rotary joint (28) to a mist generation device (24) within a rotating spindle (29). The pressure of the cutting liquid is measured by a pressure sensor (47). An air vent device (30) for opening and closing, with respect to atmospheric pressure, piping (3) that supplies the cutting liquid is provided above the rotary joint (28). A detection signal is inputted in the control board (70) from the pressure sensor (47), and when the control board (70) detects, after the pump (42) stops the supply of the cutting liquid to the piping (3), that the pressure of the cutting liquid does not decrease to a level lower than a predetermined threshold value, the control board (70) instructs the air vent device (30) to open the piping (4) to the atmosphere.