Design of Pin-on-Disk Type Abrasion Testing Machine for Durability Assessment of Rock Cutting Tools

Daeji Kim,Hoon Kang,Chang-Heon Song,Jooyoung Oh,Jung-Woo Cho,Jamal Rostami 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.7

The accurate evaluation of rock abrasion is essential for the estimation of cutter costs in rock cutting and drilling operations. In this study, a novel abrasion testing machine was developed for rock cutting tools such as pick cutters. The developed machine employs the pin-on-disk abrasion method of ASTM (American Society for Testing and Materials). The Archimedean spiral function was selected as the moving path for the pin on the rock surface. An approximation solution was adopted for the modeling of the inward and outward spiral motions under the constant velocity of the pin. After investigating the operating conditions of the pick cutter under actual cutting conditions, the specifications of the machine were set to simulate field conditions, and the testing apparatus was designed. A finite element analysis was conducted to investigate the structural stability of the machine. After the verification of the design through numerical modeling, the test unit was manufactured. Validation tests were conducted on various rock samples. The results confirmed that the abrasion testing machine effectively followed the designated pre-designed spiral path. This paper, therefore, proposes a pin-on-disk type abrasion testing method which can simulate the actual abrasion phenomenon on the real cutting conditions (i.e., force and velocity) of rock cutting tools.

마찰 마모& RCF 시험을 위한 다목적 시험기 개발

최갑수(GAB SU CHOI),김준형(JUN-HYOUNG KIM),김학두(HAK DOO KIM),도미나가(YASUTOSHI TOMINAGA),시르멩닥와(SHIRMENDAGWA DARISUREN),편영식(YOUNG-SIK PYUN) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10

In this paper, the newly developed tribometer was introduced. Ball-on-disk, pin-on-disk, small-sized journal and thrust bearings tests on friction and wear were carried out using a newly developed tribometer which is built up according to the ASTM G99. Those friction and wear test results were compared with the friction results which were approved by Korean (KOLAS) and CSM Instruments. The comparison revealed that friction characteristics and trends of three different tribometers were similar to each other. The objective of this paper is to demonstrate the capability of the newly developed tribometer. As a result, the newly developed tribometer is capable of performing friction tests using pin-on-disk, disk-on-disk, journal and thrust bearings configurations

중공형 암석시편의 Pin-on-disk 마모시험을 위한 등속도 나선경로 계산방법

강훈(Hoon Kang),김대지(Dae-ji Kim),송창헌(Changheon Song),오주영(Joo-Young Oh),조정우(Jung-Woo Cho) 한국암반공학회 2020 터널과지하공간 Vol.30 No.4

본 기술보고는 Pin-on-disk 마모시험에서 연속적인 등속도 아르키메데스 나선 경로 계산 방법에 관해 설명한다. 근사 계산된 등속도 아르키메데스 나선은 회전 중심 가까이에서 속도가 불안정하다. 따라서 본 기술보고에서는 등속도 조건을 만족시키기 위해 중공 단면을 가지는 시편을 사용하여 원점 부근에서 오프셋을 주었다. 또한, 내향형 나선과 외향형 나선을 연속적으로 연결하기 위해서 각각의 나선의 시작과 종료 지점 정보를 다음 차례의 나선에 반영하였다. 더불어, 시편의 치수과 마모시험 조건의 변화에 따라 등속도 나선 경로를 편리하게 계산하는 데 도움을 주고자 전용 계산 프로그램을 개발하였다. This technical note describes the calculation method of continuous constant linear velocity Archimedean spiral paths which are applied to the pin-on-disk abrasion test. Approximate constant linear velocity Archimedean spirals have unstable velocities in the very near region of the rotational origin. Thus, in this technical note, the offset distance from the rotational origin was given by using a hollow type rock sample to maintain the constant velocity during the test. Also, to connect the inward and outward spirals continuously, the information of start and end points were input on the next spiral path consecutively. Furthermore, the calculation program was developed to provide convenience for calculating constant linear velocity spirals according to the specimen dimension and abrasion test conditions.

다목적 마찰 & 마모 시험기 설계 및 평가

최갑수(G.S. CHOI),편영식(Y.S. PYUN),박정현(J.H. PARK),김준형(J.H. KIM),아마노브아외즈한(AUEZHAN AMANOV) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

In this paper, the improvement of friction and wear tester was introduced. ASTM G99 standard test and small-sized journal bearing as well as similar products friction and wear characteristics attribute as a matter of expense standard test from the current improved multi-purpose tester which also meet ASTM G99 standard requirements. The test results were compared to KOLAS organization as the results are similar tendency within an allowance error and to CSM friction results as well. So, according to this the friction results of the current improved friction and wear tester are more stable than previous tester friction results. As a result, pin-on-disk, disk-on-disk and bearing tests are confirmed to be conducted on this improved friction and wear tester.

Ni-4.5%Al 피복강재의 마모특성

김귀식,오맹종,김성익,고장권 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.1

The pin-on-disk type wear testing machine was manufa tur dusing a personal computer. load cell and reduction motor. The tribological properties of Ni-4.5%Al coating steel by flame spray were investigated using this test machine. The experimental result has shown that the wear amount of coating steel was remarkably decreased than the S45C material. In the lubrication environment the wear amount was much less. The friction coefficient of S45C and coating material was respectively 0.4, 0.29 in the air, and it has respectively shown 0.18. 0.24 in the lublication. Increase of load didn't have effect on the change of the friction coefficient at all.

Ni-4.5%Al 피복강재의 마모특성

고장권,김성익,오맹종,김귀식 濟州大學校工科大學産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.1

The pin-on-disk type wear testing machine was manufactured using a personal computer, load cell and reduction motor. The tribological properties of Ni-4.5%Al coating steel by flame spray were investigated using this test machine. The experimental result has shown that the wear amount of coating steel was remarkably decreased than the S45C material. In the lubrication environment the wear amount was much less. The friction coefficient of S45C and coating material was respectively 0.4, 0.29 in the air, and it has respectively shown 0.18, 0.24 in the lubrication. Increase of load didn't have effect on the change of the friction coefficient at all.

그리스 윤활유의 종류에 따른 SCM44의 마찰특성

권순구,권순홍,김원경,최원식,Kwon, Soon-Goo,Kwon, Soon-Hong,Kim, Won-Kyung,Choi, Won-Sik 한국산업융합학회 2020 한국산업융합학회 논문집 Vol.23 No.6

Friction mechanisms is a very important role in the industrial machinery. However, many experiments have been conducted to reduce the loss of energy resources and parts used due to friction because the friction force adversely affects parts, efficiency, noise, and the like of the power unit. Therefore, in this study, the friction coefficient according to the characteristics of the lubricant was measured to find out which Grease Lubricant maintains the low friction coefficient without being most affected by external conditions. A total of five grease lubricants were tested in this study: GHP CAL 301, GHP EP 2, GHP KG 10, GHP HPG 2, and GHP HTG 2. And the friction coefficient was conducted by changing the load conditions (2, 4, 6, 8, 10N) and rotational speed (24, 48, 67, 86, 105, 124, 143, 162vrpm) using a pin-on-disk wear test system. Also, duty number were calculated. As a result, it was confirmed that in all grease lubricants, the speed did not significantly affect the friction coefficient, and it was confirmed that in all lubricants, the size of the friction coefficient decreased as the load increased from a small load to a large load. In addition, it was determined from the experimental results that GHP EP 2 is the most suitable as a grease lubricant and GHP CAL 301 is not the most suitable.

TiB₂ 분말로 강화된 Cu-TiB₂ 복합재료의 내마모특성

이태우,최종운,강계명,Lee Tae-Woo,Choi Jong-Un,Kang Kae-Myung 한국재료학회 2005 한국재료학회지 Vol.15 No.12

In this study the effect of the content of $TiB_2$ on wear properties was investigated. $Cu-TiB_2$ composites have been fabricated by hot extrusion. Sliding wear tests were peformed by a pin-on-disk type wear test machine under dry condition and loads varied with from 20N to 80N at sliding speed 3.5Hz. The test results showed that the wear losses and the friction coefficients decreased with increasing $Cu-TiB_2$ volume fraction and increasing the size of $Cu-TiB_2$ particle. Wear property of $10{\mu}m,\;5 vol\%\; TiB_2$ specimen was excellent all of the wear specimens. It is thought that the increase of plastic flow resistivity due to uniform distribution of $10{\mu}m,\;5 vol\%\; TiB_2$ wear specimen would improve wear property. The worn surface and wear debris were examined by optical microscope and scanning electron microscope.

Wear and Fatigue Characteristics of New Stamping Die Material for Ultra-High-Strength Steel Sheet

이인규,정명식,이상곤,조용재,이재욱,서판기,고대철,이경훈,김병민 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

High-strength steel sheets, which are considerably cheaper than aluminum alloy sheets, are useful in reducing the weight of automobiles. The superior mechanical properties of these steel sheets, however, make stamping operations more difficult by reducing formability and tool life. An ultra-high-strength steel sheet has an even higher surface hardness and yield strength than the highstrength sheets, that further increase the forming force, die wear/galling and springback, resulting in an even greater reduction in die life during stamping. Given the clear need for a more durable die material, in this study, we evaluate the wear and fatigue characteristics of a new die material that has been developed for stamping ultra-high-strength steel. Through pin-on-disk wear testing and rotating bending fatigue testing, it is found that both the wear and fatigue characteristics of the die are improved by using this new material. And die wear is evaluated by FE analysis and experiment for ultra-high-strength steel stamping.

금속 3D 프린팅으로 보수된 AISI H13 금형강 마모특성 평가

이성윤(Sung-Yun Lee),이인규(In-Kyu Lee),정명식,이재욱(Jae-Wook Lee),이선봉(Seon-Bong Lee),이상곤(Sang-Kon Lee) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.4

In hot forming process, the dies in which excessive worn or crack occurs is reused after repair. Generally hot forming dies are recycled through a welding repair method. Welding repair methods are highly dependent on the skills of engineer. It causes process defects such as dimensional defects and structural defects. Recently, the metal 3D printing method has been applied to the repair of used dies. The aim of this study is to evaluate the wear characteristics of AISI H13 tool steel repaired by 3D printing method. Three kinds of wear specimens were fabricated by using 3D printing, welding, and initial material. A pin-on-disk wear test was carried out to evaluate the wear characteristics. From the result of wear test, the wear characteristics of 3D printing method was superior to that of the welded material, and was similar to that of the initial material.