Tungsten Sintered Spinning Ring for High-Speed Wear Control
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Solution Overview
Problem
Existing spinning rings and ring rotors in ring spinning machines face limitations in speed due to high wear and heat generation, leading to a maximum safe operating speed of around 30,000-42,000 revolutions per minute, which is not efficiently addressed by current coatings and materials.
Innovation Solution
The use of a spinning ring with a tungsten sintered material for the ring crown and a high-speed steel ring runner, optimized for improved thermal conductivity, wear resistance, and lubrication properties, allowing for increased rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the spinning ring surface is coated with hard materials (chromium, nickel-phosphorus, ceramic) to reduce wear, then the service life of the spinning ring is extended, but the ring runner wears out faster and the achievable rotor speed does not substantially increase
Solution Approach 1:
The invention changes the material parameter of the spinning ring surface from conventional hard coatings (chromium, nickel-phosphorus, ceramic) to tungsten sintered material. This material substitution fundamentally alters the friction and wear characteristics, enabling both components to operate at higher speeds without excessive wear.
Solution Approach 2:
The invention uses tungsten sintered material which combines the hardness of tungsten (450 HV) with superior thermal conductivity (180 W/mK). This composite approach integrates multiple desirable properties into a single material system, achieving both wear resistance and heat dissipation capabilities.
2Productivity
If the rotor speed is increased beyond 30,000-42,000 revolutions per minute to improve productivity, then the production capacity increases, but the contact surfaces overheat and the rotor or yarn is damaged
Solution Approach 1:
The invention changes the thermal conductivity parameter of the spinning ring surface by using tungsten sintered material with 180 W/mK (almost double that of conventional materials). This parameter change enables effective heat dissipation even at rotor speeds exceeding 50 m/s, preventing overheating and material damage.
3Strength
If the spinning ring surface is made extremely hard (up to 1000 HV) to prevent abrasive wear, then the spinning ring durability improves, but the ring runner wears out even faster due to the temperature acceleration
Solution Approach 1:
The invention optimizes the hardness parameter by using tungsten sintered material with 450 HV, which is sufficiently hard to resist wear but not excessively hard to cause counter-wear on the ring runner. This optimized hardness parameter, combined with superior thermal conductivity, resolves the contradiction between durability and preventing counter-wear.
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 combination of tungsten sintered material and high-speed steel components achieves a 10-22.6% increase in rotational speed, enhancing the operational capabilities and service life of the spinning machine.
Implementation Method 1
the tungsten grains have a high thermal conductivity of approximately 180 W/mK, which is almost double that of conventional materials and coatings. This increased thermal conductivity leads to improved heat dissipation and thus to enhanced cooling of the spinning ring surface
Implementation Method 2
During operation, the contact surfaces between the spinning ring and the rotor heat up due to friction
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a spinning ring (8) for a ring-spinning or ring-twisting machine, having a connecting piece (15) and a ring top (14), the ring top (14) consisting to at least some degree of a sintered tungsten material containing at least 90% tungsten. The invention also relates to a traveler system having a traveler made of HS steel.