Integrated Spindle Cooling Passage Design for Thermal Stability
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Solution Overview
Problem
Conventional spindle apparatus cooling structures face challenges in evenly distributing cooling fluid around the motor, leading to uneven cooling and increased production costs due to separate production of headstock components and potential thermal displacement affecting processing precision.
Innovation Solution
An integrated spindle apparatus design where the headstock and motor accommodation section are formed to include a cooling medium accumulation part with a wider width than the motor accommodation section, featuring symmetrical through-holes for even cooling medium supply and discharge, and a diverging cooling passage configuration to enhance cooling efficiency and reduce thermal displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the headstock fixing section and headstock main body are produced separately and then assembled, then the cooling structure can be implemented, but the production cost increases
Solution Approach 1:
The patent merges the headstock fixing section and headstock main body into a single integrally formed headstock structure. The cooling passages are formed directly within this integrated structure, eliminating the need for separate production and assembly of cooling components. This reduces production cost while maintaining the cooling function through the integrated design.
2Device complexity
If air is merely moved upward from the lower section of the headstock, then the cooling structure is simple, but the supply quantity of cooling fluid becomes uneven especially in the axial direction of the motor
Solution Approach 1:
The cooling passages are segmented into multiple sections: a lower cooling passage in the headstock fixing section, an upper cooling passage in the headstock main body, and a through-hole connecting them. This segmentation allows cooling fluid to be distributed to both upper and lower sections of the motor, ensuring uniform cooling along the axial direction while maintaining structural simplicity.
Solution Approach 2:
The through-hole provides an additional dimensional pathway for cooling fluid distribution. By introducing this vertical connection channel, the cooling system transitions from unidirectional (upward only) to multidirectional flow, enabling cooling fluid to reach both upper and lower portions of the motor effectively.
3Ease of manufacture
If the cooling medium accumulation part is integrally formed with the headstock, then the production cost is reduced, but the structure becomes more complex
Solution Approach 1:
The cooling medium accumulation part is merged with the headstock into a single integrally formed structure. This eliminates separate manufacturing steps for the accumulation part while the internal cooling passages provide the necessary functional complexity for effective cooling.
4Ease of manufacture
If separate components are produced and assembled, then the cooling passages can be formed, but thermal displacement affecting processing precision occurs
Solution Approach 1:
The headstock is formed as an integrated structure with built-in cooling passages, eliminating assembly joints that could cause thermal displacement. This ensures processing precision by maintaining structural integrity while providing effective cooling to the motor.
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
This design ensures even cooling distribution around the motor, reduces production costs by eliminating the need for separate mold structures, and improves processing precision by stabilizing thermal conditions.
Implementation Method 1
a cooling passage for passing a cooling medium between an inner wall surface of the spindle housing and the outer wall surface of the motor accommodation section
Data Source
AI summary
A cooling medium accumulation part is integrally formed with a spindle housing and an attaching section between the spindle housing and the attaching section so that at least a width of the cooling medium accumulation part in a direction perpendicular to the spindle is wider than a width of the motor accommodation section in a virtual projection plane obtained by projecting the cooling medium accumulation part in a direction from the spindle housing to the attaching section. A straight oil supply through-holes communicating the cooling medium accumulation part and the cooling passages are formed in a side wall part of the spindle housing.