Machine Tool Coolant Spray Head With Local Pressure Boost
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Solution Overview
Problem
Existing cooling medium spray devices for machine tools are unable to effectively remove chips and burrs due to insufficient pressure and focused spraying capability.
Innovation Solution
A cooling medium spray device with a detachable body part attached to the machine tool's main shaft, incorporating a pump with a rotary part, a pressure control device, and a nozzle system that allows for increased pressure and focused spraying of the cooling medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressure of the cooling medium supplied from the main shaft is increased to improve chip and burr removal effectiveness, then the removal effectiveness is improved, but the machine tool design becomes high pressure and costly
Solution Approach 1:
The invention divides the cooling medium supply system into two independent pressure zones: the main shaft supplies cooling medium at normal pressure, while a locally mounted pump on the tool holder increases pressure only at the spray point. This segmentation allows high removal effectiveness at the critical location without requiring the entire machine tool to be designed for high pressure, thus reducing overall system complexity and cost
Solution Approach 2:
A pump is introduced as an intermediary device between the main shaft and the spray hole. This pump acts as a local pressure booster that receives cooling medium from the main shaft and delivers it at elevated pressure to the spray hole, enabling effective chip and burr removal without modifying the main shaft or requiring high-pressure design throughout the machine tool
2Stress or pressure
If the rotational speed of the pump's rotary part is increased to increase spray pressure, then the spray pressure is increased, but the tool holder's rotational speed limit is exceeded
Solution Approach 1:
The invention employs a pump with a rotary part that rotates at variable speeds depending on operational requirements. During machining, the rotary part operates at normal speeds to avoid exceeding tool holder limits. During chip and burr removal operations, the rotary part speed is temporarily increased to boost spray pressure, utilizing dynamic speed adjustment to resolve the contradiction between pressure requirements and rotational speed limits
3Ease of operation
If the spray hole rotates together with the main shaft to spray cooling medium, then the cooling medium is supplied to the cutting edge, but the cooling medium is diffused by centrifugal force and cannot be sprayed in a focused manner
Solution Approach 1:
The invention separates the rotation function from the spraying function. The spray hole is positioned on a component that does not rotate with the main shaft, while the cutting edge continues to rotate for machining operations. This segmentation eliminates centrifugal force effects on the spray, allowing focused cooling medium delivery to precise locations such as chip accumulation areas and burr generation points, while the cutting edge still receives cooling medium during machining
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 device effectively increases the pressure of the cooling medium to remove chips and burrs, and sprays it in a focused manner towards specific locations, enhancing removal efficiency while maintaining a simple and cost-effective structure.
Implementation Method 1
the spray hole of the cooling medium supply mechanism rotates together with the main shaft. Therefore, the cooling medium sprayed from the spray hole is diffused by centrifugal force
Data Source
AI summary
Cooling medium from a main shaft (20) of a machine tool (10) is pressurized by a pump (300) and led to a nozzle (242) via a second case passage (222). A relief valve (500) is also connected to the second case passage and discharges cooling medium from an outlet port (511b) when the cooling medium pressure within the second case passage exceeds a pressure set value (Ts). At a prescribed rotational speed (Ns), the pump discharges cooling medium, at a prescribed pressure (Tr) that is higher than the pressure set value (Ts), from an outlet port (302) of the pump. The cross-sectional area (S2) of an outlet port (511b) of the relief valve is smaller than the cross-sectional area (S1) of an inlet port (511a) thereof. Therefore, at the prescribed rotational speed, a change of the discharge state of the cooling medium from the outlet port (511b) is visually observable.