Classifications

• • 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
  • G01N3/40—Investigating hardness or rebound hardness
  • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/12—Digital output to print unit, e.g. line printer, chain printer
  • G06F3/1201—Dedicated interfaces to print systems
  • G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
  • G06F3/1218—Reducing or saving of used resources, e.g. avoiding waste of consumables or improving usage of hardware resources
  • G06F3/122—Reducing or saving of used resources, e.g. avoiding waste of consumables or improving usage of hardware resources with regard to computing resources, e.g. memory, CPU
• • 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
  • G01N2203/0098—Tests specified by its name, e.g. Charpy, Brinnel, Mullen
• • 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

Definitions

• the present invention is related to a complex calibration device for the Brinell hardness test .
• the present invention is related to a complex calibration test that can enhance the precision of measurement of the Brinell hardness tested value by simultaneously performing complex calibration of many factors and a method of the hardness test using such device .
• Brinell hardness has been widely used based on hardness of the materials produced through castings and forging process. And it has been one of characteristics of materials enabling to obtain very useful information on all castings materials for cast iron and non-ferrous metals.
• Brinell hardness is a value obtained through comparative computation of the magnitude of resistance with respect to strain and the size of forced mark of an object to be measured formed by the above resistance after pressurizing an object of which hardness is to be measured with a weight which is harder (i.e., has a higher hardness) than this object.
• a weight which is harder i.e., has a higher hardness
• Brinell hardness is a typically and widely used characteristic value in actual production on-site. Brinell hardness may be computed usually by using the following equation:
• the diameter of the spherical weight [D) is a determined ⁇ l ⁇ i ⁇ (?)
• the diameter of the forced mark (d) is the value computed from the forced depth ( ⁇ ) measured according to the following Equation 2 prescribed in KS standards:
• ⁇ HB /fl (0.06487+0.0Q02173HB 0 )Bt 0 bHB t ⁇ -0.1554+0.0001454HB 0 )Bt 1
• Equation 3 It is seen from Equation 3 that, in the measurement of Brinell hardness, the speed of forcing of the tested load and the maintenance time of the tested load have an affect on Brinell hardness.
• the time taken while the load is added is measured by beginning to count by pressing the second watch when the dial gauge begins to move and finishing to count by pressing the second watch again when the movement is stopped.
• the present invention is conceived in order to resolve the conventional technical problems described in the above.
• an object of the present invention is, firstly, to provide a complex calibration device for the Brinell hardness test.
• the present invention is to provide a complex calibration device for the Brinell hardness test enabling simultaneous calibration of various elements such as force, loading speed, maintenance time, Brinell hardness, etc. accurately and precisely.
• Another object of the present invention is to provide a method of hardness test in which hardness of samples is measured accurately and reliably by using the above complex calibration device. [Technical Method of Resolution]
• the complex calibration device for the Brinell hardness test of the present invention to achieve the above-described objects is mainly comprised of a measurement unit including a force sensor for measuring the tested load, a length sensor for measuring the forced depth of a sample, a measurement terminal mounting a weight on the upper part and setting a sample in the lower part, and a connection terminal formed to be mounted on the measurement terminal of the Brinell hardness testing device; and a processing unit including a timer for measuring the time of moving of a weight axis and of acting of the tested load, a calibration part for converting each of the tested load received from the force sensor of the above measurement unit, forced depth received from the length sensor, diameters of the weight and forced mark, time values measured by the above timer, into a calibrated and computed value, and a control part for computing the calibrated Brinell hardness of the sample by having the above converted, calibrated, and computed values as computation factors .
• the above control part is further comprised of a separate memory for storing the converted, calibrated, and computed values.
• a reliable method of measuring hardness there is a method of measurement of hardness of samples by using the complex calibration device for the Brinell hardness test according to the present invention comprising the steps of working the timer simultaneously with the time of action of the tested load as the weight axis is moved; measuring the tested load and the forced depth of a sample at an interval of 10 ms to the minimum; converting the above tested load and forced depth, diameter of the weight, and measured time value of the timer into calibrated and computed values; and computing the calibrated Brinell hardness of the sample by- having the above converted, calibrated, and computed values as computation factors .
• Figure 1 is the conceptual diagram of the device of the present invention showing the principle of measuring hardness
• Figure 2 is the perspective view of a general Brinell hardness testing device
• Figure 3 is the perspective view of the complex calibration device for the Brinell hardness test according to the present invention
• Figure 4 is the conceptual diagram showing the system of the complex calibration device for the Brinell hardness test according to the present invention
• Figure 5 is a flow chart of the method of the hardness test using the complex calibration device for the Brinell hardness test according to the present invention.
• Figure 6 is the state diagram of the complex calibration device for the Brinell hardness test according to the present invention showing how it is used.
• Figure 2 is the perspective view of a general Brinell hardness testing device.
• the complex calibration device (100) according to the present invention is installed at the measurement terminal (210) of the Brinell hardness testing device (200) shown in the above figure, i.e., coupled between a weight (211) and a sample set part (212) .
• the structure and operational principle of the Brinell hardness testing device (200) are that a sample, which is fixed tightly to the sample set part (212) is forced by moving down a weight (211) vertically, when the force applied to the sample by the weight (211) is measured and indicated on a gauge (220) .
• Figure 3 is the perspective view of the complex calibration device (100) for the Brinell hardness test according to the present invention
• Figure 4 is the conceptual diagram showing the system of the complex calibration device (100) for the Brinell hardness test according to the present invention.
• the complex calibration device (100) according to the present invention may be largely divided into a measurement unit (110) and a processing unit (120) as shown in Figure 3.
• the measurement unit (110) is a part which is in charge of actual measurement as it is fit into the measurement terminal (210) of a general Brinell hardness testing device
• processing unit (120) is a part receiving and processing the data measured by the above measurement unit (110) .
• the measurement unit (110) is comprised of a force sensor (111) , length sensor (112) , measurement terminal (113), and connection terminal (114).
• the complex calibration device (100) is coupled with the measurement terminal (210) of the above Brinell hardness testing device (200) in terms of a connection terminal (114), and eventually, the load applied to the measurement terminal (210) of the above Brinell hardness testing device (200) is delivered to the measurement terminal (113) of the complex calibration device (100) as is.
• the force delivered by the weight (211) of the Brinell hardness testing device (200) is not directly delivered to the sample, but is delivered to the weight which is in the upper part of the measurement terminal (113) of the complex calibration device (100) .
• the weight of the complex calibration device (100) is directly forced into the sample. Also, although the force generated while the weight in the upper part of the measurement terminal (113) is forced to the sample is measured on the gauge (220) of the Brinell hardness testing device (200) , before that, it is delivered to and measured by the force sensor (111) of the complex calibration device (100) more accurately. During this process, not only the force applied to the sample is measured by the force sensor (111) , but also the forced depth is measured simultaneously by the length sensor (112) in the above complex calibration device (100) . And the above two signals (force and length) are delivered to and processed by the processing unit (120) of the complex calibration device (100) .
• the processing unit (120) has the functions for performing proper computation by using the signals delivered from the force sensor (111) and length sensor
• the signals delivered from the force sensor (111) and length sensor (112) and the time signals measured by the timer (122) are converted into the values for calibration and computation by the calibration part (121) (after being converted into the signals that may be computed mutually, if necessary) .
• the above calibration and computation values are delivered to the control part (123) , and the calibrated value of Brinell hardness is computed and outputted by having the above values as computation factors.
• control part (123) is further equipped with a memory (124) so that the measured tested load and forced depth are stored by using the force sensor (111) and length sensor (112) that can be measured by the timer (122) at an interval of 10 ms to the minimum, and the calibration and computation values and the final Brinell hardness values are compouted by using the data on force and length with respect to each time, at which time the measurement interval to receive measured values from the force sensor
• control part (123) may be set differently according to the purpose of the user. (For example, when measuring one sample for more precise and accurate measurement, it is possible to have the computation value in the control part
• Figure 5 is a flow chart showing the steps of operation of the complex calibration device of the present invention.
• the weight moves toward a sampLe (Sl)
• the load begins to be increased by the force sensor at the moment that the weight is forced into the sample.
• the control part orders the timer to begin the measurement of forcing time when the load is begun to be detected in the force sensor (S2) .
• the control part determines whether the process of forcing is terminated and orders the timer to terminate the measurement of forcing time as well as to begin the measurement of maintenance time (S3) .
• the tested load While the tested load is maintained, the tested load is measured constantly in the force sensor (S4) , and that value measured constantly is used for the value of the tested load. Further, the diameter of the forced mark may be computed and used by using the forced depth measured by the length sensor, i.e., the distance progressed from the time that the weight comes in contact with the sample. If it is ordered by the control part to terminate maintenance of the tested load and to terminate measurement of the maintenance time at the same time (S5) , measurement of the maintenance time is completed, and the calibrated Brinell hardness value is computed by the control part by using the forcing time, tested load, forced depth, maintenance time value, and pre-inputted diameter value of the weight that are measured in the above steps (S6) .
• temporal changes of the data measured by the force sensor and length sensor are used as the criteria for determination of ordering the timer to begin or terminate measurement for the control part.
• the amount of information stored in the memory becomes greater, and the number of samples that may be measured at a time is reduced.
• the interval of measurement becomes longer, there is an advantage of enabling measurement of many samples at a time although accuracy and reliability of the calibrated Brinell hardness value becomes lower somewhat.
• the complex calibration device enhances convenience on the part of users since the interval of measurement may be set arbitrarily by a user according to the purpose and priority of the user (i.e., whether the priority is in precise measurement, in efficient and prompt measurement of more samples, etc.) .
• control part uses changed amounts of values measured by the length sensor for the criteria of determination on ordering of beginning or termination of measurement.
• other data that can use the operational principle presented in the presented invention (such as having the signal for beginning to measure the forcing time detected in terms of an electric signal generated between two objects at the moment that the weight and the sample come into contact in view of that the weight egupped at the measurement terminal of the complex calibration device and the sample are both metals, i.e., conductors, etc.) as the criteria for determining ordering of beginning or termination of measurement for the control part according to the convenience of a person skilled in the art.
• Figure 6 shows the state of using in which the complex calibration device for the Brinell hardness test according to the present invention is combined and equipped with a general Brinell hardness testing device.
• Forcing of the Brinell hardness testing device may be done in various ways such as using electric power, fluid pressure (T ⁇ *! " ??) , etc.
• the complex calibration device according to the present invention is applicable to various conventionally used hardness testing devices since the weight and sample setting parts of most hardness testing devices are manufactured in similar forms according to the standards for the Brinell hardness test.
• the connection terminal has to be manufactured specially as ordered in case of hardness testing devices that are hard to install as they have different shapes. That is, the hardness testing device according to the present invention is significant in that the conventional hardness testing device may be used as is with its performance improved effectively.
• the present invention is effective for removing at a time the conventional problems of errors occurred during the measurement of the forcing speed and the maintenance time of tested load as measured values are obtained by the person measuring based on his/her eye measurement subjectively by using a second watch; lowered reliability as a result of repetitive measurement for the above reason; errors of having different results of measurement for each person measuring; impossibility in measurement if forcing occurs faster than the reaction speed of the person measuring, etc.
• the complex calibration device according to the present invention is advantageous in that it may be simply attached to and detached from many types of Brinell hardness testing devices used widely.

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• 2005
  • 2005-10-27 KR KR1020050101573A patent/KR100669544B1/ko active IP Right Grant
  • 2005-12-14 WO PCT/KR2005/004279 patent/WO2007049839A1/en active Application Filing

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