Stone Cutting Wire Tensioning via Sliding Bearings
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Solution Overview
Problem
Existing stone cutting machines with diamond wires face challenges in maintaining consistent tension across multiple wires, leading to inefficiencies and increased maintenance due to the use of rolling bearings, which results in wobble and premature wear, limiting the ability to produce thin slabs with high precision and requiring extensive space and costly repairs.
Innovation Solution
The machine employs sliding or friction bearings instead of rolling bearings for mounting driven pulleys, allowing for independent tensioning of each wire and reducing wobble, along with a motor-driven shaft to synchronize pulley rotation and reduce wear, enabling the production of thin slabs with improved precision and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rolling bearings are used for mounting driven pulleys, then the machine can operate with multiple wires, but wobble and premature wear occur leading to increased maintenance
Solution Approach 1:
The patent employs sliding bearings instead of rolling bearings for mounting driven pulleys. Sliding bearings are simpler, more reliable, and require less maintenance despite having shorter service life. This substitution eliminates the wobble and premature wear issues associated with rolling bearings while maintaining the multi-wire cutting capability.
2Device complexity
If a single tensioning system is used for all wires, then device complexity is reduced, but tension consistency across wires deteriorates
Solution Approach 1:
The patent divides the tensioning system into independent units for each wire. Each driven pulley is mounted on a separate sliding bearing, allowing independent tension adjustment for each wire. This segmentation ensures that tension consistency is maintained across all wires while the overall system remains manageable through modular design.
3Device complexity
If driven pulleys are mounted on a fixed spindle, then structure is simplified, but pulley wobble increases causing harmful effects
Solution Approach 1:
The patent extracts the driven pulleys from the fixed spindle and mounts them on sliding bearings that allow independent movement. This extraction eliminates the constraint that causes wobble when multiple pulleys are rigidly mounted on a single spindle, while the sliding bearings provide the necessary support and stability.
4Ease of operation
If rolling bearings are used for driven pulleys, then ease of operation is improved, but maintenance cost and complexity increase
Solution Approach 1:
The patent replaces rolling bearings with sliding bearings, which are simpler in construction, cheaper to manufacture and replace, and require less maintenance. Although sliding bearings may have slightly different operational characteristics, they provide sufficient smooth rotation for the application while dramatically reducing maintenance complexity and cost.
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 solution allows for the production of thin slabs with regular cut surfaces and reduced maintenance costs by minimizing wobble and wear, enhancing the reliability and efficiency of the cutting process while reducing the complexity and cost of maintaining the machine.
Implementation Method 1
The machine employs sliding or friction bearings instead of rolling bearings for mounting driven pulleys, allowing for independent tensioning of each wire and reducing wobble
Data Source
AI summary
A machine (12) for cutting blocks of stone material (14) into slabs by means of cutting wires (16) comprises a frame (22) on which the following are rotatablv mounted: a set of driving pulleys (18) suitable for rotation by first motor means, and at least one set of driven pulleys (20) mounted on a shaft. Each of the driven pulleys (20) is mounted independently and rotatably on the shaft. The machine comprises means (36) for varying the tension of each cutting wire (16) and means for relative movement of the block and cutting wire (16) in the cut feeding direction. The shaft (30) of the at least one set of driven pulleys (20) is designed to rotate in the same direction of rotation as these of the driven pulleys and is connected to second motor means (40).