Pin-on-plate tribometer with differential temperature control
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Solution Overview
Problem
Existing friction and wear test devices cannot simulate differential temperature environments where the pin and plate have significantly different temperatures, which is crucial for mimicking the conditions of hot-stamping processes, and they lack efficient heating and cooling mechanisms.
Innovation Solution
A pin-on-plate friction and wear test device with a high-temperature heating chamber and a cooling pin system that uses electric resistance heating and circulating cooling medium to achieve differential temperature adjustment, allowing for real-time temperature monitoring and control through thermocouples, enhancing heating efficiency and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radiant heating method is used, then heating coverage is large, but heating efficiency is low
Solution Approach 1:
The invention extracts the heating function from a general radiant heating system and implements a dedicated electric resistance heating plate specifically positioned beneath the friction sample plate. This localized heating approach eliminates unnecessary heating of surrounding areas, significantly improving heating efficiency while reducing energy consumption compared to blanket radiant heating methods.
Solution Approach 2:
The heating system applies local quality by concentrating thermal energy precisely where needed - under the friction sample plate only. The electric resistance heating plate is positioned to provide focused heating to the specific region requiring high temperature, rather than uniformly heating the entire chamber, thus achieving high heating efficiency with lower energy input.
2Temperature
If friction sample plate is heated to high temperature, then hot-stamping simulation is achieved, but pin temperature must also be controlled much lower
Solution Approach 1:
The temperature control system is segmented into independent zones: the friction sample plate is heated by an electric resistance heating plate to high temperatures (600-850°C), while the friction pin is separately cooled by circulating cooling medium through its internal channels to maintain low temperatures (100-300°C). This segmentation allows differential temperature distribution without requiring a single complex control system, as each component has its own dedicated temperature control mechanism.
Solution Approach 2:
The invention introduces an intermediary cooling system for the pin that acts as a mediator between the high-temperature environment and the pin itself. The circulating cooling medium serves as an intermediary substance that absorbs excess heat from the pin, enabling the pin to maintain low temperature while the plate reaches high temperature, thus achieving differential temperature distribution with manageable system complexity.
3Productivity
If cooling medium circulates through pin, then cooling efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The friction pin incorporates internal cooling channels that function similarly to porous structures, allowing circulating cooling medium to flow through the pin's interior. This design enables efficient heat removal from the pin while maintaining a relatively simple cylindrical geometry that is straightforward to manufacture using conventional machining or drilling processes, thus achieving high cooling efficiency without excessive manufacturing complexity.
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 simulates tribological behavior in differential temperature environments, achieving uniform and stable heating up to 900°C for the plate and cooling the pin to 100-300°C, accurately mimicking hot-stamping conditions with high heating and cooling efficiency, and preventing warping of the sample plate.
Implementation Method 1
The electric resistance heats the fixed sample to experiment temperature
Implementation Method 2
The electric resistance heating plate heats the friction sample plate by the through-hole heat radiation and heat conduction in the ceramic plate and the support block
Implementation Method 3
The electric resistance heating plate heats the friction sample plate by the through-hole heat radiation and heat conduction in the ceramic plate and the support block
Implementation Method 4
The inner layout of pin is a circling cooling channel where the cooling medium adjusts and cools the temperature of the sample
Implementation Method 5
Thermocouples are separately distributed in the temperature measuring groove of the heating chamber and the temperature measuring hole of the cooling pin for real-time temperature measurement
Implementation Method 6
The device can simulate the friction and wear properties of two kinds of material during the mutual friction process in a differential temperature environment
Data Source
AI summary
A pin-on-plate friction and wear test device includes a high temperature heating chamber and a cooling pin. The high temperature heating chamber is fastened horizontally to the mobile base. The axis of the cooling pin is perpendicular to the upper surface of the mobile base. The electric resistance heating plate is located in the bottom closed space under the friction sample plate in the high temperature heating chamber. The electric resistance heats the fixed sample to experiment temperature. The inner layout of pin is a circling cooling channel where the cooling medium adjusts and cools the temperature of the sample. Thermocouples are separately distributed in the temperature measuring groove of the high temperature heating chamber and the temperature measuring hole of the cooling pin for real-time temperature measurement. The device can simulate the friction and wear properties of the high-strength steel plate and hot-stamping die in the differential temperature environment.