Pump-Integrated Tool Holder for Focused Coolant Chip Control
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Solution Overview
Problem
Existing tool holders, especially non-rotating ones, face challenges in achieving sufficient cooling and chip removal efficiency due to limited pressure of the cooling medium, leading to potential tool and workpiece damage from long continuous chips.
Innovation Solution
A tool holder design incorporating a pump and nozzle system that increases the pressure of the cooling medium, allowing it to be sprayed in a focused manner, effectively fragmenting chips and preventing them from wrapping around the tool or workpiece, even when using non-rotating tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressure of the cooling medium supplied from the machine tool is increased to improve chip removal effect, then the chip removal efficiency is improved, but the machine tool requires expensive high pressure specifications
Solution Approach 1:
The invention extracts the pressure increase function from the machine tool system and relocates it to the tool holder. A pump mechanism is integrated into the tool holder, which draws cooling medium from the supply and pressurizes it locally before spraying onto the cutting edge. This extraction allows the machine tool to remain at standard pressure specifications while achieving high-pressure cooling and chip removal effects at the tool level.
Solution Approach 2:
The pump mechanism in the tool holder acts as an intermediary device between the low-pressure cooling medium supply from the machine tool and the high-pressure requirement for effective chip removal. This intermediary component transforms the cooling medium pressure locally, enabling high-pressure operation without requiring the entire machine tool system to be designed for high pressure.
2Stress or pressure
If a pump with rotary part is used to increase cooling medium pressure, then the pressure can be increased by increasing rotational speed, but the tool holder cannot rotate at high speeds when holding rotary tools
Solution Approach 1:
The invention segments the rotation functions: the tool holder rotates at low speed to position the tool, while a separate rotary drive mechanism rotates the pump's rotary part at high speed to pressurize the cooling medium. This segmentation allows independent optimization of each rotation function without conflict between tool holder speed requirements and pump speed requirements.
Solution Approach 2:
The invention implements dynamic control where the pump's rotary part rotates at high speed only when needed for pressure generation, while the tool holder maintains its positioning rotation. The system dynamically switches between positioning mode and pressure generation mode, allowing the pump to operate at optimal high speeds without compromising tool holder stability or exceeding speed limits for rotary tool operation.
3Reliability
If ordinary cooling medium pressure is used, then the machine tool operates normally, but sufficient cooling and lubricating effects cannot be obtained
Solution Approach 1:
The tool holder is equipped with its own pump mechanism that autonomously pressurizes the cooling medium supplied from the machine tool. This self-service capability allows the tool holder to independently generate the high pressure needed for effective cooling and lubrication without requiring the machine tool's main cooling system to operate at high pressure. The tool holder essentially serves itself by providing the pressure boost it needs.
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 enables high-pressure cooling medium to be sprayed in a focused manner, effectively fragmenting chips and preventing them from causing damage, while avoiding the need for expensive machine tool upgrades or additional drive mechanisms.
Implementation Method 1
a pump (200), in which a rotary part (210) is disposed so as to be rotatable in conjunction with the rotation of the rotary member (130)... the rotary part (210) increases the pressure of the cooling medium to a pressure corresponding to the rotational speed of the rotary part (210)
Implementation Method 2
supply a cooling medium such as an oil (called a 'coolant') to the cutting edge of the tool for lubrication between the workpiece and the tool, for cooling the workpiece or the tool
Implementation Method 3
supply a cooling medium such as an oil (called a 'coolant') to the cutting edge of the tool for lubrication between the workpiece and the tool
Data Source
AI summary
A tool holder (100) holds a tool (170) in a non-rotatable manner. When an attaching surface (112a) of a body part (110, 120, 150) of the tool holder is attached to a tool holder attachment surface of a machine tool, cooling medium supplied from the machine tool flows through a first body part passage (114, 124). Then, a rotary member (130) is rotationally driven by a drive mechanism provided in the machine tool. When a rotary part of a pump (200) rotates with the rotary member, the pressure of the cooling medium suctioned into the pump is proportionally increased in accordance with the rotational speed of the rotary part, and pressurized cooling medium is discharged from an outlet part (202) of the pump. The pressurized cooling medium then flows through a second body part passage (115, 125) and is thereafter sprayed from a spray hole (161) of a nozzle (160).