JB/T 7367.1-2000 This standard is a revision of the original ZB J26 002-89 "Ultrasonic flaw detection method for cylindrical helical compression springs". This standard specifies the ultrasonic flaw detection method for cylindrical helical compression springs. This standard is applicable to the ultrasonic flaw detection of cylindrical compression springs with round cross-section steel wire, diameter of φ1.0~φ8.0mm and both ends ground during the production process. Note: This standard was first issued in 1989. However, it was not approved in time during the review in 1999, and a new number was not given in time. Therefore, it was regarded as a natural elimination. Therefore, the replacement relationship is not written on the first page of the standard text, and it is only stated in the preface. JB/T 7367.1-2000 Ultrasonic flaw detection method for cylindrical helical compression springs JB/T7367.1-2000 Standard download decompression password: www.bzxz.net

JB/T 7367.1--2000
This standard is a revision of the original Z13J26002-
89 "Cylindrical helical compression springs" with editorial modifications, and the main technical content has not changed. Introduction
Revision of ultrasonic flaw detection method. When revising, the original standard is proposed and managed by the National Technical Committee for Spring Standardization. Drafting units of this standard: Mechanical Science Research Institute, Standard Parts Factory of the Second Automobile Manufacturing Plant, 588
］Scope
Machinery Industry Standards of the People's Republic of China
Cylindrical helical compression springs
Ultrasonic flaw detection method
Non-destructive ulfrasonic testing method ofroiled helical compression springss. This standard specifies the ultrasonic flaw detection method of cylindrical helical compression springs (hereinafter referred to as springs). JB/T 7367. 1 -- 2000
This standard applies to ultrasonic flaw detection of round compression springs with round cross-section, diameter of 1.0-8.0mm and both ends ground during the production process.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. JB/T10061-1999 General technical conditions for pulse reflection ultrasonic flaw detector JB/T10062-1999 Performance test method for ultrasonic probe 3-General provisions
3.1 For springs working in key parts of the main machine and bearing dynamic loads, which must be 100% inspected, ultrasonic flaw detection can be carried out. 3.2 The flaw detection personnel must undergo special training and assessment by the relevant departments and obtain the corresponding qualification certificate. 3.3 This method should be able to detect cracks, slag inclusions, welding joints and other defects in the spring. 3.4 The contact pulse reflection method is used for ultrasonic flaw detection. 3.5 The ultrasonic flaw detector (hereinafter referred to as the flaw detector) and other auxiliary equipment should work in places without strong vibration, high temperature, high-frequency electromagnetic field, large dust, corrosive liquids and gases, and strong light. The fluorescent screen of the flaw detector should avoid direct sunlight. 4 Instruments, probes and coupling agents
4.1 Flaw detector
4.1.1 The flaw detector should comply with the provisions of JB/T10061. 4.1.2 The working frequency range is 2.5～5MHz. The choice of working frequency is related to the wire diameter and the unfolded length of the spring. 4.1.3 The detection depth should be able to effectively display the initial wave and bottom wave of the standard sample on the fluorescent screen. For general spring professional manufacturers, the detection depth should not be less than 5000mm.
4.1.4 The sensitivity of the flaw detector should meet the requirement that the echo wave height of the artificial defect of the standard sample is not less than 80% of the full scale when the attenuation is 4dB. 4.2 Probe
4.2.1 The various technical indicators of the probe should be tested according to JB/T10062. 4.2.2 Select K2 shear wave probe or 62° surface wave probe according to the diameter of the steel wire. The side length of the chip is 4~12mm + its frequency is 2.5~5 MHz
Approved by the State Bureau of Machinery Industry on April 24, 2000 and implemented on October 1, 2000bZxz.net
4.3 Coupling agent
JB/T 7367.1—2000
It is recommended to use high-quality glycerin. Engine oil and transformer oil can also be used. 5 Standard specimens
The standard specimen for ultrasonic flaw detection (hereinafter referred to as the standard specimen) is a spring used to adjust the sensitivity of the ultrasonic flaw detector and the probe combination. 5.1 Material, type, size and processing status The material, type, size and processing status of the standard specimen should be the same as those of the spring to be ultrasonically tested. 5.2 Technical requirements and test methods
5.2.1 Springs for making standard samples
Springs selected for making standard samples shall be subjected to magnetic particle inspection and ultrasonic inspection, and shall be free of defects. 5.2.2 Manufacture of artificial defects
The spring selected for making standard samples shall be mounted on a special mandrel, and then placed on a V-shaped iron. The highest point on the outer surface of the spring shall be selected at 12 points of its total extended length. A surface Rockwell hardness tester and a diamond cone indenter for Rockwell hardness test shall be used. Different loads shall be selected according to the diameter of the steel wire to press a dent on the spring steel wire.
5.2.3 Method for measuring the size of the dent
To ensure the consistency of the standard samples, the size of the dent (the maximum size of the dent in the longitudinal direction of the steel wire) shall be measured for selection. In actual operation, the size of the dent can be measured by a surface roughness tester, an inductive micrometer on a Vickers hardness tester, and a vertical metallographic microscope. If any two devices are available at the same time, the test results shall be cross-checked. 5.2.4 The standard sample should be kept clean to avoid bumps, scratches and rust. 5.2.5 The standard sample should meet the relevant technical requirements of the product. If there is any dispute, it can be submitted to the relevant department for judgment. 6 Flaw detection method
6.1 The surface of the spring must be clean before flaw detection, and no debris such as oil, rust and oxide scale is allowed. 6.2 Flaw detection should be carried out after the spring is heat treated and before shot peening. 6.3 The surface roughness of the plane of the spring support ring Ra≤6.3μm 6.4 After 10 minutes of startup, use the standard sample to adjust the flaw detector so that the initial wave and the bottom wave are in the specified position, and then adjust the combined sensitivity so that the wave height of the artificial defect reaches the specified number of grids, and then the flaw detection can be carried out. 6.5 The coupling agent should be evenly and appropriately applied on the plane of the spring support ring or the working surface of the probe. The probe should be placed on the plane of the spring support ring and pressed slightly to ensure full contact, and then slowly moved back and forth, and swung left and right within a certain range. The probe should be in contact with the plane of the spring support ring for no less than 2S each time. During the whole flaw detection process, the flaw detector should always keep his fingers clean. 6.6 The plane of the support ring at both ends of each spring must be inspected once. 6.7 The qualified and unqualified springs should be strictly distinguished, and they should be stacked separately and clearly marked. 6.8 The results of flaw detection in each shift and the existing problems should be recorded in detail. 6.9 During the flaw detection process, the sensitivity of the flaw detector should be checked with standard samples every 2 hours. If it deviates from the set value during the initial flaw detection, the instrument should be adjusted before flaw detection
6.10 The main technical indicators of the flaw detector and probe should be calibrated at least once every six months according to JB/T10061 and JB/T10062. 7 Defect assessment
7.1 The quality acceptance standard of spring ultrasonic flaw detection shall be implemented in accordance with relevant technical conditions or agreements. 7.2 The evaluation of defect size can be compared by amplitude method by referring to the artificial defects of the standard sample. 7.3 Springs that do not have bottom waves during flaw detection should be scrapped. 7.4 The location of defects can be determined by comparing the horizontal coordinates of the scale between the initial wave and the bottom wave on the fluorescent screen and the position of the damaged wave with the number of spring coils.
JB/T 7367.1-
7.5 In case of disputes over the assessment of defects, the evaluation can be conducted through consultation by using the dissection method or other inspection methods recognized by both parties to the dispute, and can also be verified through spring fatigue tests.
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