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JJG 145-2011 English PDF

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Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 145-2011 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

JJG 145: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 145-2007	370	Add to Cart	Auto, < 3 mins	Pendulum Impact Testing Machines	Valid
JJG 145-1982	359	Add to Cart	3 days	Verification Regulation of Pendulum Impact Testing Machine	Obsolete
JJG 145-1973	RFQ	ASK	3 days	(Chinese Industry Standard)	Obsolete

Similar standards

JJG 145 JJG 1148 JJG 1149

Basic data

Standard ID: JJG 145-2011 (JJG145-2011)
Description (Translated English): Special Measuring Tools for Axle Journal in the Railway Rolling Stocks
Sector / Industry: Metrology & Measurement Industry Standard
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine

JJG 145-2007: Pendulum Impact Testing Machines

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Verification Regulation of Pendulum Impact Testing Machines National Metrological Verification Regulations of the People's Republic of China Pendulum impact tester Published on.2007-08-21 2008-02-21 Implementation Published by the General Administration of Quality Supervision, Inspection and Quarantine Pendulum impact tester Verification Regulations ImpactTesting Machines Replacing JJG 145-1982 This procedure was approved by the General Administration of Quality Supervision, Inspection and Quarantine on August 21,.2007, Effective February 21,.2008. Focal unit. National Technical Committee on Hardness and Hardness Measurement Main drafting unit. Central Iron and Steel Research Institute China Institute of Metrology Beijing Institute of Metrology and Testing Participating drafting unit. Changchun Testing Machine Research Institute Beijing Nak Analytical Instrument Co., Ltd. Weapons Department 269 Regional Metrology Station Shenzhen New Sansi Group Corporation Shanghai Institute of Metrology and Testing Technology This Regulation entrusts the National Technical Committee on Strength and Hardness Measurement to be responsible for interpretation The main drafters of this regulation. Wang Chunhua (General Research Institute of Iron and Steel) Zhou Weisong (General Research Institute of Iron and Steel) Zhang Zhimin (Chinese Academy of Metrology) Chen Xi (Beijing Institute of Metrology and Testing) Participating drafters. Wang Xuezhi (Changchun Testing Machine Research Institute) Chen Wu (Steel Research Institute) Wei Yunjian (General Research Institute of Iron and Steel) Zheng Jianping (Beijing Nak Analytical Instrument Co., Ltd.) Zhou Zhaofeng (Weapon Department 269 Regional Metrology Station) An Jianping (Shenzhen Xinsansi Group Company) Guiren Zhang (Shanghai Institute of Metrology and Testing Technology)

1 Scope (1) 2 Citations (1) 3 Terms and Units of Measure (1) 4 Overview (3) 5 Metrological performance requirements (3) 5.1 Test machine frame (3) 5.2 Pendulum (3) 5.3 Anvil and support (4) 5.4 Indication device (4) 5.5 Indirect verification using standard samples (4) 6 General technical conditions (5) 7 Control of measuring instruments (6) 7.1 Verification conditions (6) 7.2 Verification items (7) 7.3 Verification method (7) 7.4 Available range of testing machine (11) 7.5 Processing of test results (11) 7.6 Verification cycle (11) Appendix A Standard Impact Specimens of Arc and Rectangle (12) Appendix B Test Machine Components (14) Appendix C Impact knife, specimen support and anvil of the testing machine (15) Appendix D The structure of the sample support and anvil of the working test machine (18) Appendix E Determination of Initial Potential Energy (19) Appendix F Verification Certificate Inner Page Format (20) Appendix G Verification Record of Pendulum Impact Tester (21) Verification Regulations of Pendulum Impact Tester

1 Scope

This regulation is applicable to the first verification, subsequent verification and in-use inspection of the pendulum impact testing machine (hereinafter referred to as the testing machine).

2 Citations

The following documents are cited in this procedure. GB/T 229 "Metallic materials-Charpy pendulum impact test method" GB/T 1043-1993 "Test method for impact of rigid plastic simply supported beams" GB/T 3808-2002 (ISO 148-2..1998, Metalicmaterials-Charpypendulumimpact test-Part 2. Verification of test machines, MOD) GB/T 18658-2002 "Charpy V-notch standard sample for pendulum impact tester inspection" GB/T 15000.3-1994 "Guidelines for the Work of Standard Samples (3) General Principles and Statistical Methods for the Determination of Standard Samples" law" JJG 2077-1990 "Verification System of Pendulum Impact Energy Measuring Instrument" ASTME23-05StandardTestMethodsforNotchedBarImpactTestingofMetalicMa- terials When using this procedure, care should be taken to use the currently valid version of the above-cited references.

3 Terminology and unit of measure

3.1 Terms related to testing machines 3.1.1 Anvilfaces In the simply supported beam type impact testing machine, it is perpendicular to the horizontal support surface to support the impact of the pendulum on the specimen. Force bearing surface. Also known as anvil (see Figure C.1) 3.1.2 base The part of the testing machine frame below the horizontal support surface of the sample support. 3.1.3 centerofpercussion When the pendulum impacts the specimen, the horizontal impact reaction force of the pendulum axis to the pendulum (refers to the impact reaction force parallel to the upper surface of the sample) When it is zero, the position of the striking point on the hammer blade. (See Figure D.1). 3.1.4 Hit point centerofstrike Place the specimen or equivalent gauge with a height of half the standard width (i.e. 5mm) on the specimen support, and the pendulum should be free In the hanging position, the point where the blade of the impact knife contacts the horizontal plane on the sample (see Figure C.1). 3.1.5 hammering edge When impacting the sample, the straight part where the hammer blade is in contact with the sample. Sometimes called the impact blade. Actual contact The blade has a 2mm curvature radius (2mm impact knife) or 8mm curvature radius (8mm impact knife), or other curvature radius (See Appendix B) 3.1.6 Test piece support The testing machine base is processed into a horizontal bearing surface, and it is used to place the part that is hit by the pendulum in advance (see figure) B.1 and Figure C.1). The bearing surface is perpendicular to the bearing surface of the anvil. 3.1.7 industrial testing machine Testing machines for testing metal materials in industry, general laboratories or most research laboratories. These tests The machine is not used to give a standard value. The verification of the working test machine shall be carried out in accordance with the methods specified in this Regulation. 3.1.8 reference machine Testing machine for determining standard energy of standard samples. The verification requirements of this testing machine are stricter than the working testing machine. These ones The requirements are specified in GB/T 18658. 3.2 Terms related to energy 3.2.1 KV actual absorbed energy (absorbed energy) When testing with a testing machine, the total energy required to break the sample. It is equal to the initial potential energy of the pendulum in the initial position The difference from the initial potential energy when the first half cycle is completed after the specimen breaks. 3.2.2 Kp initialpotentialenergy When the pendulum is in the initial position, it is relative to the horizontal potential energy of the center of mass when the pendulum is in the free position. 3.2.3 Indicated energy (indicated energy) The energy value indicated by the pointer of the testing machine or other indicating device. 3.2.4 KN nominalinitialpotentialenergy (nominalenergy) The energy value given by the testing machine manufacturer. 3.2.5 KR reference energy Absorbed energy value of standard sample. 3.2.6 reference test pieces Compare the indicated energy measured by the testing machine with the standard energy value marked on the sample to verify the working testing machine The suitability is used for impact specimens. 3.3 Definition of the sample (test position placed on the support of the test machine) (see Figure D.1). 3.3.1 height The distance between the notched face and the opposite face. 3.3.2 width Dimensions parallel to the notch and perpendicular to the height direction. 3.3.3 length Maximum dimension perpendicular to the direction of the notch. 3.4 Units of measurement The unit of measurement of pendulum moment M is Newton meters (N · m); The unit of measurement for impact energy is Joule (J).

4 Overview

4.1 This regulation specifies the verification of a testing machine for the test of a simple supported beam specimen under the action of a single impact force. method. 4.2 This regulation specifies two verification methods. a) Direct verification method. This method is actually a static verification method, that is, by examining the key components of the testing machine To ensure that it meets the requirements of this code. The verification instrument used shall prove that it can be traced to the legal unit of measurement in China. National benchmark. Also known as component verification method. b) Indirect verification method. This method is actually a dynamic verification method, that is, a standard sample verification test machine is used. Also known as indication value verification method.

5 measurement performance requirements

5.1 Test machine frame 5.1.1 The parallelism of the axis of the pendulum axis and the reference plane shall be within 1/1000. The item should be included in the certificate of conformity by the manufacturer Given. 5.1.2 When the pendulum is suspended freely, the clearance between the blade of the impact knife and the specimen shall be within ± 0.5mm. 5.1.3 The parallelism between the side of the pendulum and the swing plane and the perpendicularity between the side of the pendulum and the specimen support are shown in Table 1. Table 1 Requirements on the side and swing plane of the pendulum, and the sample support Impact energy per pendulum/J < 10 ≥10 Parallelism of pendulum side and swing plane 1.5/1000 1.0/1000 The perpendicularity between the side of the pendulum and the sample support is 90 ° ± 0.1 ° (or 3/1000). 5.1.4 The impact blade should be on a plane passing the center of the span of the support and perpendicular to the span, with a tolerance of 0.5mm. Pendulum When freely swinging, the angle between the blade and the longitudinal axis of the specimen shall be 90 ° ± 2 °. 5.1.5 The axial clearance of the swing shaft should not exceed 0.25mm. 5.1.6 The radial clearance at the swing shaft bearing should not exceed 0.08mm. 5.2 Pendulum 5.2.1 When the pendulum is plumb, the driven needle should be adjusted to the maximum energy position; when the pendulum is struck by air, the driven needle should be stable without jumping The ground is brought to zero, and the maximum allowable return to zero difference is ± 0.1% of the maximum energy of the pendulum. 5.2.2 Energy loss includes energy lost from air resistance, bearing friction and pointer friction. Should meet the requirements of Table 2. Table 2 Requirements on energy loss Maximum energy per pendulum/J 0.5 1 > 1 ~ ≤10 > 10 ~ ≤60 > 60 Energy loss should not be greater than /% of maximum impact energy 4.0 3.0 2.0 1.0 0.5 5.2.3 The distance from the axis of the pendulum axis to the center of the strike (ll) should be consistent with the distance (l) of the axis of the pendulum axis to the center of the sample. It should be 0.995l ± 0.005l. 5.2.4 The maximum allowable value of the relative deviation of the pendulum torque from its nominal value is ± 0.5%. Maximum allowable value of fluctuation 0.5%. 5.2.5 The maximum allowable relative error between the initial potential energy Kp of the pendulum and the nominal energy KN is shown in Table 3. Table 3 Maximum allowable relative error between the initial potential energy Kp of the pendulum and the nominal energy KN Maximum impact energy per pendulum/J 0.5 1 > 1 ~ ≤10 > 10 ~ ≤60 > 60 Tolerance of initial position /% 4.5 3.5 2.5 ± 1.5 ± 1.0 5.2.6 Accuracy of dial indexing marks. When less than 50% of the nominal energy KN, indicating the energy KS and the initial potential The maximum allowable value of the relative error of Kp is ± 0.5%; when 50% ~ 80% of the nominal energy, the indicated energy KS and The maximum allowable relative error of absorbed energy KV is ± 1%. 5.2.7 The impact speed should be 5m/s ~ 5.5m/s, but any value in the range of 3m/s ~ 6m/s is allowed. Bright. 5.2.8 The angle between the contact line of the impact knife and the horizontal axis of the specimen shall be 90 ° ± 2 °. 5.2.9 The main dimensions of the impact blade should conform to national standards GB/T 229, GB/T 1043, GB/T 3808, etc. Requirements related to test methods and technical standards (see Appendix C). 5.3 Anvil and support 5.3.1 The two bearing surfaces of the anvil should be parallel, and the difference should not exceed 0.1mm. The plane of the two bearing surfaces of the support The included angle between the plane and the plane on which the two supporting surfaces of the anvil are located shall be 90 ° ± 0.1 °. (Please refer to Appendix C and Appendix D for specific size requirements) 5.3.2 The two bearing surfaces of the support shall be parallel and the difference shall not exceed 0.1mm. The support shall be such that the axis of the specimen and the pendulum The parallelism of the shaft axis is within 3/1000. 5.3.3 There shall be sufficient space to ensure that the sample that has been blown away from the testing machine freely without hindrance and placed in the swing position. The hammer body does not spring back until the hammer has finished swinging. The width of each part of the pendulum passing between the anvils should not exceed 18mm. 5.4 Indication device 5.4.1 Inspection of analog indicating device The analog indicating device shall be scaled in angular units or energy units. The indexing value of the indicating device should not be greater than 1/100 of the nominal value, and at least 0.25% of the reading energy should be estimated. 5.4.2 Inspection of digital indicating device Digital indicating devices shall be scaled in angular units or energy units. The minimum resolution of the indicating device of the testing machine can be at least 1/400 of the nominal energy. 5.5 Indirect verification using standard samples 5.5.1 Indirect verification is to check the comprehensive performance of the testing machine using V-notch standard samples. Standard Sample Technique The requirements shall meet the requirements of GB/T 18658-2002. See Table 4 for the standard deviations allowed for standard impact specimens. Table 4 Allowed standard deviation of V-notch standard impact test specimens Energy KR Standard Deviation < 40J ≤2.0J ≥40J ≤5% KR The V-notch standard sample size is 55mm × 10mm × 10mm. The standard energy value of a standard impact specimen shall be within one of the following ranges. Low energy (L) level. standard energy value < 30J Medium energy (M) level. 30J≤standard energy value < 110J High energy (H) level. 110J ≤ standard energy value < 220J Ultra-high energy (UH) level. standard energy value ≥220J Note 1. When a V-notch standard impact specimen is not obtained, other shapes of standard impact specimens can be used, such as arc, For rectangular standard impact samples, see Appendix A. The arbitration test uses a V-notch standard impact specimen. Note 2. When the result of the indirect test is not satisfactory, the direct test should be performed as the first test. 5.5.2 Use standard samples to monitor the performance of the testing machine throughout its life. For example. the verification of the testing machine; the periodical inspection of the testing room; the inspection of the testing machine when abnormal test data is found. 5.5.3 When using a V-notch standard sample, the error and repeatability of the indication value of the testing machine shall meet the requirements of Table 5. Table 5 Maximum allowable values of display error and repeatability Energy level error repeatability < 40J ± 4J 6J ≥40J ± 10% KR 15% KR 5.5.4 When using non-V-notch standard sample inspection, the error and repeatability of the indication value of the testing machine should meet the requirements of Table 6. set. Table 6 Maximum allowable value of indication error and repeatability Energy level error repeatability < 40J ± 2.4J 3.6J ≥40J ± 6% KR 9% KR

6 General technical requirements

6.1 The testing machine should be firmly installed on a stable, vibration-free and solid foundation to ensure that the quality of the foundation is not less than that of the pendulum. 40 times the amount. Base level is 0.5/1000. 6.2 The test machine shall have the name, model, specification, mark, number, date of manufacture, and manufacturer. 6.3 The connection between the pendulum and the hammer body of the testing machine and the hammer body and the impact knife should be firm. The pendulum should be straight, the scale of the dial The marking shall be clear and free from other defects that affect the test results. The pendulum control mechanism should be flexible, and the locking mechanism should be accessible. by. The testing machine shall have appropriate protective devices.

7 Control of measuring instruments

Control of measuring instruments includes. first verification, subsequent verification and in-use inspection. 7.1 Verification conditions 7.1.1 The temperature range for normal verification should be 23 ℃ ± 5 ℃, the temperature during verification should be stable, and the temperature change should not exceed Over 2 ° C. 7.1.2 The test machine shall be in normal working condition during the check. 7.1.3 For verification equipment and measuring instruments, see Table 7. Table 7 Verification equipment and measuring instruments Remarks on the verification items of technical characteristics 1 level 0.2 frame, pendulum moment, etc./ 2 Optical tilt meter 5 ′ potential energy, tilt angle detection /

3 calipers

Graduation value is not lower than 0.02mm division Related part size / Prism, feeler, protractor, half Caliper, square Universal measuring tool Clearance, angle, impact Blade R, anvil R, Two sides of the pendulum and the sample Block verticality 5 Rectangular section sample 10mm × 9.5mm clearance between impact knife and sample /

6 Strike point thrust block

10mm × 20mm × 100mm steel block, in 100mm long intermediate processing 10mm depth, included angle 30 °, tip R are 2mm and 8mm V-shape Slot thrust block Hit the pendulum Force. The impact blade is Selection of R2 V-groove R2 thrust block; For impact blade R8 Selection of V-groove R8 Force block Flat on the support Pendulum knife in the middle For pushing into the V-groove 502 glue bonding, At the end of the thrust block Center (corresponding to pendulum (Hammer hit point) 7 Dial indicator, magnetic stand, stopwatch Compliant with General Gage requirements Pendulum shaft clearance, strike center / 8 Weighing machine (dynamometer) 0.1 pendulum moment, pendulum shaft clearance with corresponding accessories

9 Pendulum bracket height adjustable support pendulum

Have a certain load capacity 10 Standard impact test specimen Energy standard deviation < 40J ≤2J ≥40J ≤5% Impact energy According to the scope of use Choose energy level 7.2 Verification items The test items for the first verification, subsequent verification and in-use inspection of the testing machine are shown in Table 8. Table 8 Verification Items Serial number verification item The first verification and subsequent verification

1 Appearance

2 Installation status-- 3 Base level, support level-- 4 Clearance between impact blade and specimen-- 5 Pendulum side parallelism, verticality--

6 Center difference between impact knife center and anvil span

7 Axial clearance, radial clearance of the swing shaft- 8 Point return to zero difference, energy loss 9 Strike Center-- 10 Initial potential energy of pendulum, indicated energy of dial, impa......

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Question 2: Can I share the purchased PDF of JJG 145-2011_English with my colleagues?

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Question 3: Does the price include tax/VAT?

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Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version JJG 145-2011?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 145-2011 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.