KR100307409B1 - Method of compressive fracture strength test on abrasive grain - Google Patents
Method of compressive fracture strength test on abrasive grain Download PDFInfo
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- KR100307409B1 KR100307409B1 KR1019990005035A KR19990005035A KR100307409B1 KR 100307409 B1 KR100307409 B1 KR 100307409B1 KR 1019990005035 A KR1019990005035 A KR 1019990005035A KR 19990005035 A KR19990005035 A KR 19990005035A KR 100307409 B1 KR100307409 B1 KR 100307409B1
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- South Korea
- Prior art keywords
- abrasive particles
- measuring
- abrasive
- fracture strength
- compression plate
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000006061 abrasive grain Substances 0.000 title claims description 19
- 239000002245 particle Substances 0.000 claims abstract description 58
- 238000007906 compression Methods 0.000 claims abstract description 30
- 230000006835 compression Effects 0.000 claims abstract description 29
- 208000010392 Bone Fractures Diseases 0.000 claims abstract description 18
- 206010017076 Fracture Diseases 0.000 claims abstract description 18
- 238000001179 sorption measurement Methods 0.000 claims abstract description 10
- 206010010214 Compression fracture Diseases 0.000 claims abstract description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 238000009826 distribution Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002775 capsule Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000353345 Odontesthes regia Species 0.000 description 1
- 229910009043 WC-Co Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
- G01N2203/0046—Vacuum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/021—Treatment of the signal; Calibration
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
본 발명은 연마입자의 압축파괴강도 측정방법에 관한 것으로, 연마입자용기(3)내에 수용되어진 연마입자(4)를 진공흡착장치(1)로 흡착하여 힘측정장치(7)의 상부면을 이루는 압축판(5)상에 자동으로 이송시키는 단계와; 압축판(5)의 상부면에 안착되어진 연마입자(4)를 프레스(6)의 압축판(5')을 이용하여 압축파괴시키는 단계 및; 프레스(6)의 압축파괴과정에서 힘측정장치(7)로부터 측정되어진 연마입자(4)의 압축력을 제어장치(8)를 이용하여 전기적신호로 변환하여 수치로 표시하는 단계로 이루어져, 개별입자의 압축파괴강도를 단시간내에 명확하고 용이하게 측정할 수 있게 됨은 물론 압축파괴강도의 분포상황도 알 수 있게 되어, 압축파괴강도를 측정하기 위한 측정시간과 비용절감에 의한 생산원가가 감소될 뿐만 아니라 정확한 측정결과가 산출되어 작업의 신뢰성이 증대되게 한 것이다.The present invention relates to a method for measuring the compressive fracture strength of abrasive particles, which absorbs the abrasive particles (4) contained in the abrasive particle container (3) by the vacuum adsorption device (1) to form an upper surface of the force measuring device (7). Automatically conveying onto the compression plate (5); Compressing and destroying the abrasive particles 4 seated on the upper surface of the compression plate 5 by using the compression plate 5 'of the press 6; Compressive force of the abrasive particles (4) measured from the force measuring device (7) during the compression fracture process of the press (6) is converted into an electrical signal using the control device 8 to display the numerical value of the individual particles It is possible to measure the compressive fracture strength in a short time clearly and easily, as well as to know the distribution status of the compressive fracture strength, which not only reduces the production cost due to measurement time and cost saving for measuring the compressive fracture strength, The measurement results are calculated to increase the reliability of the work.
Description
본 발명은 연마입자의 압축파괴강도 측정방법에 관한 것으로, 특히 연마입자를 진공흡착을 이용하여 다이아몬드소결체로 성형된 압축시험기의 압축판상으로 하나씩 자동으로 이송하여 단시간내에 개별입자의 압축파괴강도를 측정시킬 수 있도록 된 연마입자의 압축파괴강도 측정 방법에 관한 것이다.The present invention relates to a method for measuring the compressive fracture strength of abrasive particles, and in particular, the abrasive particles are automatically transported one by one onto a compression plate of a compression tester formed of diamond sintered body by vacuum adsorption to measure the compressive fracture strength of individual particles within a short time. The present invention relates to a method for measuring the compressive fracture strength of abrasive particles that can be made.
일반적으로, 연마입자의 압축강도를 측정하는 방법으로는, 충격강도시험(Friability test) 및 개별입자 압축강도시험 등이 사용되고 있는데, 이 중에서도 충격강도시험은 강철구와 연마입자를 캡슐안에 넣은 상태에서 일정ㅇ시간동안 캡슐을 흔들어 강철구와 연마입자가 충돌되게 하므로써, 연마입자의 깨진 비율을 측정하는 간접적인 방법이다.In general, as a method of measuring the compressive strength of the abrasive particles, the impact strength test (Friability test) and the individual particle compressive strength test, etc. are used. Among these, the impact strength test is a constant while the steel sphere and the abrasive particles in the capsule It is an indirect method of measuring the broken fraction of abrasive particles by shaking the capsules over time, causing the steel balls and abrasive particles to collide.
그러나, 충격강도시험은 전체강도에 대한 값을 얻을 수는 있지만, 연마입자는 시험 중 강도가 약한 입자부터 깨지는 특성이 있기 때문에, 깨지지 않은 입자에 대한 강도분포는 물론 깨진 입자의 강도분포를 정확히 알 수 없는 문제가 있다.However, the impact strength test can obtain a value for the total strength, but since the abrasive particles have the characteristics of breaking from the weakest strength during the test, the strength distribution of the unbroken particles as well as the strength distribution of the broken particles are accurately known. There is no problem.
즉, 충격강도시험을 통해 얻어지는 수치로는 일정한 강도 이상의 입자들이 차지하는 상대량만을 알 수 있을 뿐 강도의 분포는 알 수 없으며, 이는 동일한 충격강도 시험값을 갖더라도 실제성능에 있어서는 차이가 발생할 수 있다.In other words, the numerical value obtained through the impact strength test can only know the relative amount of particles occupied by a certain strength or more, but not the distribution of the strength. This may cause a difference in actual performance even with the same impact strength test value. .
따라서, 연마입자의 실제성능과 강도 사이의 상호 관계를 분석하기 위해서는 개별입자에 대한 강도분포 파악이 요구됨은 물론, 결과치를 통계자료로 사용하기 위하여는 다수개에 대한 강도측정이 필요하게 된다.Therefore, in order to analyze the correlation between the actual performance and the strength of the abrasive particles, it is necessary to grasp the intensity distribution of the individual particles, as well as to measure the strength of a large number in order to use the results as statistical data.
한편, 개별입자의 압축강도시험으로는, 재료시험기를 이용하여 입자 하나씩을 파괴하여 압축강도를 측정하는 방법이 사용되고 있지만, 이러한 압축강도시험은 많은 시간과 노력이 요구되어 통계치를 위한 다수회의 측정에는 어려움이 있다.On the other hand, as the compressive strength test of individual particles, a method of measuring the compressive strength by breaking down particles one by one using a material tester is used. However, such a compressive strength test requires a lot of time and effort. There is difficulty.
또한, 연마입자의 압축강도를 개별적으로 측정하는 방법으로서, 유럽특허 (0611092A1)에 의하면, 연마입자를 서로 반대방향으로 회전하는 롤러사이로 넣어 압축파괴되는 최대힘을 측정하는 방법이 이용되고 있다.In addition, as a method of individually measuring the compressive strength of the abrasive grains, European Patent (0611092A1) uses a method of measuring the maximum force that compresses and breaks the abrasive grains between rollers rotating in opposite directions.
그러나, 유럽특허에 의하면, 연마입자를 압축파괴시키기 위해서, 경도가 높은 초경롤러(WC-Co 소결체)를 사용하므로써, 초경롤러의 가공에 따른 부대비용이 증대됨은 물론 수명이 짧아 주기적으로 교체해야하는 문제점이 있었다.However, according to the European patent, in order to compress and destroy the abrasive particles, the use of a high hardness cemented carbide roller (WC-Co sintered body) increases the incident cost associated with machining the cemented carbide roller and shortens the life, thereby requiring periodic replacement. There was this.
또한, 유럽특허에 의하면, 연마입자가 면이 아닌 모서리나 꼭지점이 압축되어 파괴가 일어나는 경우, 압축강도의 측정값이 달라지게 되므로써, 측정자료의 오차로 작용될 여지가 있는 문제점이 있었다.In addition, according to the European patent, when fracture occurs because the abrasive particles are compressed at the corners or vertices other than the surface, the measurement value of the compressive strength is changed, there is a problem that can act as an error of the measurement data.
이에, 본 발명을 상기한 바와 같은 제문제점을 해결하기 위하여 안출된 것으로, 연마입자를 개별적으로 압축하여 파괴하는 과정에서 정확한 강도를 측정함과 동시에 다량의 입자를 단시간내에 측정할 수 있도록 된 연마입자의 압축파괴강도 측정 방법을 제공하는 데에 그 목적이 있다.상기한 바의 목적을 달성하기 위한 본 발명은, 연마입자의 압축파괴강도를 측정하기 위한 측정방법을 제공함에 있어서, 연마입자용기내에 수용되어진 연마입자를 진공흡착장치로 흡착하여 힘측정장치의 상부면을 이루는 압축판상에 자동으로 이송시키는 단계와; 압축판의 상부면에 안착되어진 연마입자를 프레스의 압축판을 이용하여 압축파괴시키는 단계 및; 프레스의 압축파괴과정에서 힘측정장치로부터 측정되어진 연마입자의 압축력을 제어장치를 이용하여 전기적신호로 변환하여 수치로 표시하는 단계로 이루어진 것을 특징으로 한다.Thus, the present invention was devised to solve the problems described above, the abrasive particles to be able to measure a large amount of particles in a short time while measuring the exact strength in the process of compressing and breaking the abrasive particles individually. It is an object of the present invention to provide a method for measuring the compressive fracture strength of the present invention. To achieve the above object, the present invention provides a measuring method for measuring the compressive fracture strength of abrasive particles, Adsorbing the received abrasive particles by a vacuum adsorption device and automatically transferring the abrasive particles onto a compression plate forming an upper surface of the force measuring device; Compressing and destroying the abrasive particles seated on the upper surface of the compression plate by using the compression plate of the press; It characterized in that it consists of converting the compressive force of the abrasive particles measured from the force measuring device during the compression fracture process of the press into a numerical value by converting the compressive force into an electrical signal using a control device.
도 1은 본 발명에 따른 연마입자 압축파괴강도 측정장치의 구성도,도 2(a),(b)는 압축파괴강도의 시험결과를 히스토그램으로 도시한 그래프도,도 3은 도 2의 정규분포곡선을 도시한 그래프도이다.1 is a block diagram of the abrasive grain compressive strength measuring apparatus according to the present invention, Figure 2 (a), (b) is a graph showing the test results of the compressive fracture strength in a histogram, Figure 3 is a normal distribution of Figure 2 It is a graph showing a curve.
* 도면 중 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
1 : 진공흡착장치 2 : 진공흡착바늘1: vacuum suction device 2: vacuum suction needle
3 : 연마입자용기 4 : 연마입자3: abrasive grain container 4: abrasive grain
5 : 압축판 6 : 프레스5: compression plate 6: press
7 : 힘측정장치 8 : 제어장치7: force measuring device 8: control device
이하, 본 발명에 따른 실시예를 상세하게 설명하면 다음과 같다.도 1은 본 발명에 따른 연마입자 압축파괴강도 측정장치의 구성도로서, 본 발명에 따른 압축파괴강도 측정방법은, 연마입자용기(3)내에 수용되어진 연마입자(4)를 진공흡착장치(1)로 흡착하여 힘측정장치(7)의 상부면에 구비되어진 압축판(5)의 상부면으로 자동이송시키는 단계와; 압축판(5)의 상부면에 안착되어진 연마입자(4)를 프레스(6)를 이용하여 압축파괴시키는 단계 및; 프레스(6)의 작동과정에서 힘측정장치(7)로부터 측정되어진 연마입자(4)의 압축력을 제어장치(8)를 통해 전기적신호를 변환하여 수치로 표시하는 단계로 이루어져 있다.그리고, 본 발명에 따른 압축파괴강도 측정장치는, 연마입자용기(3)내에 수용되어진 연마입자(4)를 흡착하여 진공흡착장치(1)의 압축판(5)위로 이송시키는 진공흡착시스템과, 압축판(5)위로 이송되어진 연마입자에 압축하중을 가하면서 그 힘을 측정하는 프레스시스템과, 진공흡착시스템과 프레스시스템을 제어하는 제어시스템으로 구성된다,또한, 진공흡착시스템은, 진공흡착장치(1)의 하부측에 결합된 상태에서 연마입자와 접촉되어 연마입자를 흡착하는 진공흡착바늘(2)과, 진공흡착장치(1)를 프레스(6)의 하부측으로 이송시키는 이송부로 구성된다.또한, 프레스시스템은, 본 발명의 측정장치에 설치되어 연마입자(4)의 압축력을 전기적신호로 변환시켜주는 힘측정장치(7)와, 힘측정장치(7)의 상부측에 구비된 상태에서 상하방향으로 이동하는 프레스(6)로 구성되어 있다.물론, 힘측정장치(7)의 상부면과 프레스(6)의 하부면에, 다이아몬드소결체로 성형되어진 각각의 압축판(5,5')이 평행하게 장착된다.또한, 제어시스템은, 진공흡착장치(1)와 프레스(6)와 힘측정장치(7)에 전기적으로 연결되어, 연마입자(4)의 흡착과정과 이송과정과 파괴과정과 하중측정의 순환과정을 자동제어하는 역할을 담당한다.따라서, 진공흡착장치(1)의 하부측에 구비되어진 진공흡착바늘(2)이 연마입자용기(3)안에 수용되어있던 연마입자(4)를 흡착하여 물게 되면, 제어장치(8)의 신호를 입력받은 진공흡착장치(1)가 힘측정장치(7)를 이루는 압축판(5)의 상부에 연마입자(4)로 내려놓고 원위치하게 된다.이어서, 제어장치(8)의 신호를 입력받은 프레스(6)의 압축판(5')이 하향되면서 압축판(5)상에 놓여져있던 연마입자(4)를 압축파괴시키고, 힘측정장치(7)는 연마입자의 파괴과정에서 작용하는 힘을 감지하여 제어장치(8)로 전달한다.물론, 상기한 과정에서 제어장치(8)는 연마입자(4)의 흡착과정에서 프레스(6)의 압축과정을 순차적으로 제어하면서 기기를 작동시키게 되며, 동시에 제어장치(8)에서는 연마입자(4)의 최대힘을 찾아 파괴하중을 수치로 표시하게 되므로, 작업자는 용이하게 알 수 있는 것이다.또한, 힘측정장치(7)의 상부측을 이루는 압축판(5)과 프레스(6)의 하부측을 이루는 압축판(5')은 경도가 적어도 9이상이 재질이 이용되며, 이상적으로는 다결정 다이아몬드소결체로 사용함이 바람직하다.만일, 압축판(5,5')의 경도가 낮은 경우, 고경도의 연마입자(4)를 쉽게 파괴시키지 못함은 물론 압축판에 압흔을 남기게 되며, 압축판의 압흔에 의한 손상으로 인해 파괴강도측정에 따른 신뢰성이 저하되기 때문이다.따라서, 상술한 작용이 연속적으로 이루어지게 됨에 따라 연마입자의 개별 파괴강도를 용이하게 알 수 있으며, 압축파괴공정이 자동화되어 단시간내에 많은 연마입자의 파괴강도를 구할 수 있게 되는 것이다.[실시예]먼저, 본 발명에서 사용되어진 연마입자(4)는 40~50메쉬(0.3~0.425mm)크기의 다이아몬드소결체이고, 연마입자의 품질에 따라 시료A.B(충격강도기준 A〉B)로 구분하여 실시하였다. 이때, 연마입자(4) 즉, 시료A.B를 각각 200개씩 파괴하여 압축파괴강도를 구하였고 각 시험당 소요시간은 15분이 소요되었다.도 2의 히스토그램에서도 알 수 있듯이, 단시간내에 연마입자(A.B)의 압축파괴강도와 분포상황 및 평균값과 표준편차값을 용이하게 알 수 있으며, 도 3의 정규분포곡선에서도 알 수 있듯이, 연마입자(A,B)를 비교하여 볼 때, 시료A가 시료B보다 높은 강도값을 갖는 입자가 더 많이 분포된 것을 명확하게 알 수 있는 것이다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an embodiment according to the present invention will be described in detail. FIG. 1 is a schematic diagram of an apparatus for measuring the compressive fracture strength of the abrasive grain according to the present invention. (3) adsorbing the abrasive particles (4) contained in the vacuum suction device (1) to automatically transfer to the upper surface of the compression plate (5) provided on the upper surface of the force measuring device (7); Compressing and destroying the abrasive particles 4 seated on the upper surface of the compression plate 5 by using the press 6; The compression force of the abrasive particles 4 measured from the force measuring device 7 during the operation of the press 6 is converted into an electrical signal through the control device 8 and displayed in numerical values. Compression strength measurement apparatus according to the present invention includes a vacuum adsorption system for adsorbing the abrasive particles (4) contained in the abrasive grain container (3) and transported onto the compression plate (5) of the vacuum adsorption apparatus (1), and the compression plate (5). And a press system for measuring the force while applying a compressive load to the abrasive grains conveyed above, and a control system for controlling the vacuum adsorption system and the press system. It consists of a vacuum suction needle (2) contacting the abrasive particles in the state coupled to the lower side and adsorbing the abrasive particles, and a transfer unit for transferring the vacuum suction device (1) to the lower side of the press (6). Silver side of the present invention A force measuring device 7 installed in the main device to convert the compressive force of the abrasive grains 4 into an electrical signal, and a press 6 moving upward and downward in a state provided on the upper side of the force measuring device 7; Of course, on the upper surface of the force measuring device 7 and the lower surface of the press 6, the respective compression plates 5, 5 'formed of diamond sintered bodies are mounted in parallel. The system is electrically connected to the vacuum adsorption device 1, the press 6, and the force measurement device 7 to automatically control the adsorption process, the transport process, the breaking process and the circulation process of the abrasive particles 4. Therefore, when the vacuum suction needle 2 provided on the lower side of the vacuum suction device 1 absorbs and bites the abrasive particles 4 contained in the abrasive particle container 3, the control device is provided. Abrasive particles on the upper part of the compression plate (5) that the vacuum suction device (1) receiving the signal of (8) forms a force measuring device (7) Then, it is lowered to (4) and returned to its original position. Then, the abrasive grains (4) placed on the compression plate (5) while the compression plate (5 ') of the press (6) receiving the signal of the control device 8 is lowered. And the force measuring device 7 detects the force acting in the process of breaking the abrasive particles and transfers the force to the control device 8. Of course, in the above-described process, the control device 8 receives the abrasive particles 4 In the adsorption process of the press 6 to control the compression process in sequence while operating the device, and at the same time the control device 8 finds the maximum force of the abrasive grains 4 to display the breakdown load numerically, Further, the compression plate 5 forming the upper side of the force measuring device 7 and the compression plate 5 'forming the lower side of the press 6 have a hardness of at least 9 or more. It is preferably used as a polycrystalline diamond sintered body. This is because when the degree is low, the abrasive particles 4 of high hardness are not easily destroyed, and the indentation is left on the compressed plate, and the damage caused by the indentation of the compressed plate is reduced due to the breakdown strength measurement. As the above-described action is continuously performed, the individual breaking strength of the abrasive particles can be easily known, and the compression breaking process can be automated to obtain the breaking strength of many abrasive particles in a short time. [Example] First, The abrasive grains 4 used in the present invention are diamond sintered bodies having a size of 40 to 50 mesh (0.3 to 0.425 mm), and were divided into samples AB (impact strength criteria A> B) according to the quality of the abrasive grains. At this time, the compressive fracture strength was obtained by breaking the abrasive particles 4, that is, 200 samples AB each, and the time required for each test was 15 minutes. As can be seen from the histogram of FIG. The compressive fracture strength, distribution state, mean value and standard deviation value of the sample can be easily known. As can be seen from the normal distribution curve of FIG. 3, when the abrasive particles (A, B) are compared, the sample A is larger than the sample B. It can be clearly seen that more particles with high intensity values are distributed.
이상에서 설명한 바와 같이 본 발명에 따른 연마입자의 압축파괴강도 측정방법에 의하면, 개별입자의 압축파괴강도를 단시간내에 명확하고 용이하게 측정할 수 있음은 물론 강도의 분포상황도 알 수 있게 되어, 압축파괴강도를 측정하기 위한 측정시간과 비용절감에 의한 생산원가가 감소될 뿐만 아니라 정확한 측정결과가 산출되어 작업의 신뢰성을 증대되는 효과가 있는 것이다.As described above, according to the method for measuring the compressive breakdown strength of the abrasive grains according to the present invention, the compressive breakdown strength of the individual particles can be measured clearly and easily within a short time, and the distribution of the strengths can be also understood. Not only the production cost due to the measurement time and cost reduction for measuring the breaking strength is reduced, but also the accurate measurement results are calculated, thereby increasing the reliability of the work.
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| KR1019990005035A KR100307409B1 (en) | 1999-02-12 | 1999-02-12 | Method of compressive fracture strength test on abrasive grain |
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| US10634595B2 (en) | 2015-10-07 | 2020-04-28 | Lg Chem, Ltd. | Method of measuring fracture strength of single particles of superabsorbent polymer |
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