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A test method and device for friction and wear performance of roll ring block

A friction and wear, testing device technology, applied in the testing field, can solve the problems of large equipment, unstable contact stress, difficulty in sample preparation, etc., and achieve the effect of accurate simulation

Active Publication Date: 2018-12-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] When the test method or device in the above technical solution is applied to the actual test work, either the sample preparation is difficult, the equipment is huge, the system is complicated, or the contact stress is not constant, which is far from the actual working condition of the roll, so it is difficult to simulate easily and accurately Roll actual friction and wear behavior

Method used

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  • A test method and device for friction and wear performance of roll ring block
  • A test method and device for friction and wear performance of roll ring block
  • A test method and device for friction and wear performance of roll ring block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] The contact pressure between the rolls σ=500~1500MPa. During the simulation test, L 2 =500mm,L 1 =50mm; friction sample block (size: 15×10×5mm) is made of the same chemical composition as the back-up roll (5% Cr), and the hardness is the same as the hardness of the working layer of the back-up roll (50HRC); the outer diameter of the accompanying sample ring is Φ30mm. The rotating speed of the accompanying sample ring is V=225rpm calculated according to the friction rate of 5%.

[0106] Take the contact stress σ=1000MPa as an example, take the counterweight G=1000N, and move the code at L 0 =112mm starts loading, and the sensor detects the wear depth d(D) of the test block, and the counterweight automatically moves to the right through coupling to realize the contact stress of 1000MPa during the wear process. Then stop the test. The test process control system automatically records the wear depth, the temperature of the friction sample block, the rotation speed of th...

Embodiment 2

[0110] The influence of roll slip rate on wear is simulated by changing friction for speed V. For a four-high rolling mill with a working roll diameter of Φ860mm, a backup roll diameter of Φ1500mm, a roll speed of 90rpm, and a slip rate of 3%, the outer diameter of the accompanying sample ring is Φ30mm, and the rotating speed of the accompanying sample ring is V=135rpm. Table 2 shows the relationship between the roll friction rate and the rotational speed of the accompanying sample ring.

[0111] Table 2 The comparative relationship between the rotational speed of the sample ring and the slip rate of the roll

[0112]

Embodiment 3

[0114] The effect of rolling lubrication on roll wear can be simulated by changing the ratio and temperature of lubricating fluid. Practice has shown that when the roll cooling emulsion contains a certain amount of lubricant, the friction coefficient of the roll is much smaller than that of pure water cooling or dry friction, which helps to reduce roll wear. Therefore, it is also very convenient to study the effect of lubrication on roll wear by conducting experiments in the ring block wear test device of this technical solution. The emulsion can be prepared in the laboratory and placed in the oil tank, and the sample ring is emulsified with the oil tank below. The liquid contact brought into the friction interface between the friction sample block and the accompanying sample ring plays a lubricating effect on the friction. The temperature of the lubricating fluid can be controlled by heating the heating wire in the oil tank.

[0115] In the testing method of the technical so...

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Abstract

The invention provides a testing method and apparatus for the block-on-ring friction and wear performance of a roller, belonging to field of testing. According to the invention, a movable counterweight loading lever automatically coupled with wear depth is constructed for applying a constant contact crushing stress automatically coupled with the wear depth on a block-on-ring friction pairs so as to guarantee that contact stress between the friction pairs always maintains unchanged; actual friction and wear conditions of the roller are accurately simulated through block-on-ring friction and wear experiments and tests under the constant contact crushing stress, so influence of a variety of working condition parameters on the wear performance of the roller can be researched. The whole apparatus is simple and compact in structure and convenient to operate, can better research the rules of influence of a variety of factors on the friction and wear performance of the roller, is capable of researching influence of a variety of working condition parameters on the wear performance of the roller and lays a solid foundation for development of novel rollers, improvement of the wear resistance of rollers and reduction in consumption of rollers. The testing method and apparatus can be extensively applied to fields of testing of and research on the friction and wear performance of mechanical parts like rollers and bearing under the condition of constant contact stress.

Description

technical field [0001] The invention belongs to the field of testing, and in particular relates to a testing method and device for the friction and wear performance of mechanical parts working under constant contact stress conditions. Background technique [0002] The roll is a key component in the steel rolling production machinery and equipment, and the service life of the roll has become one of the important factors that determine the production cost, production efficiency and labor intensity. [0003] Among all the factors affecting the service life of the roll, the wear resistance of the roll is the most critical factor, and the wear of the working layer of the roll is the main failure mode. [0004] From the perspective of tribology, the essence of roll wear is the material loss caused by the contact and relative sliding between the roll and the strip or supporting roll under the action of rolling force. [0005] Factors affecting roll wear include roll material, roll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/56
Inventor 温宏权瞿海霞吴琼孙大乐王建刚
Owner BAOSHAN IRON & STEEL CO LTD
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