JB/T 5925.2-1998 Technical conditions for mechanical vibration aging device
Some standard content:
J61
JB
Mechanical Industry Standard of the People's Republic of China
JB/T5925.2-1998
Mechanical vibration aging device
Technical conditions||tt ||Released on 1998-07-17
National Machinery Industry BureaubzxZ.net
Released
Implemented on 1998-12-01
JB/T5925.2—1998||tt| |Foreword
This standard is a revision of JB5925.2-91 "Technical Conditions for Mechanical Vibration Aging Devices". The revision still retains the technical content of the original standard that has been proven to be suitable for my country's national conditions. This standard has major changes from JB5925.2-91 in the following main contents: the test method and calculation formula for acceleration are given; the requirements for insulation resistance are revised to comply with relevant standards; the requirements and tests for steady speed accuracy are revised Method 1: Modify the requirements for the motor:
Add the acceleration tolerance requirements for the same peak value under the condition of harmonic rate; add the conditions for type testing.
This standard will replace JB5925.2-91 from the effective date. This standard is proposed by the Jinan Casting and Forging Machinery Research Institute of the Ministry of Machinery Industry. This standard is under the jurisdiction of the National Technical Committee for Machinery Standardization. This standard was drafted by: Heilongjiang Hailun Vibration Aging Equipment Factory, Jinan Casting and Forging Machinery Research Institute of the Ministry of Machinery Industry, Jinan Keli Technology Company, Jinan Development Zone Huayun Aging Development Co., Ltd. The main drafters of this standard: Yang Guodong, Shi Daizeng, Tang Xiaoniu, Liu Jiuming, Liu Lei, Zhao Xianhua. This standard was first released on November 27, 1991. 1 Fanyuan
Mechanical Industry Standard of the People's Republic of China
Mechanical Vibration Aging Device
Technical Conditions
JB/T5925.21998
Replaces JB5925.291
This standard specifies the technical requirements, test methods and inspection rules for mechanical vibration aging devices (hereinafter referred to as devices). This standard applies to devices for vibration aging treatment of metal castings, welding parts, and silver parts. 2 Reference Standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. This standard When a standard is published, the versions shown are valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T5226.1—1996
JB 1644-91
JB/T5925.191
JB/T 6331.292
ZB J50 00688
3 Terms
Industrial Machinery and Electrical Equipment Part 1: General Technical Conditions General Technical Conditions for Casting Machinery
Basic Parameters of Mechanical Vibration Aging Device
Measurement Method for Noise Caused by Casting Machines Sound Pressure Level Determination Metal Cutting The preparation curve of the machine tool random technical documents: the process of slowly adjusting the particle rate of the vibrator from small to large is called the scanning curve. As the power frequency changes, the workpiece's actuating response changes, and the curve reflecting the relationship between the actuating response and frequency is called the scanning curve. For example, AF is called the amplitude frequency curve: a- is called the speed frequency curve. Note: A—frame, F-
rate, a-
4 technical requirements
acceleration,
4.1 The device should comply with the provisions of this standard, and Manufactured according to drawings and technical documents approved by prescribed procedures. 4.2 It is recommended that the parameters of the device be based on the parameters of JB/T5925.1. 4.3 The device should be able to work normally under the following conditions of use. 4.3.1 Ambient temperature
a) Control box 0℃～40℃;
b) Vibrator 20℃～+40℃,
4.3.2 Relative humidity not greater than 80 %(25℃). 4.3.3 The altitude should not exceed 1000m, and the surface paint of the
44 device should be free of stains, carbon damage, cracks, etc. 4.5 The electrical system should comply with the regulations of GB/T5226.1. 4.6 The random technical documents should include the product instruction manual, product certificate and packing list. The preparation of the random technical documents should comply with the regulations of ZBJ50006.
4.7 exciter
National Machinery Industry Bureau approved 1998-07-17 for implementation on 1998-12-01
1
JB/T5925.2—1998|| tt||4.7.1 The connection structure between the excitation box and the motor should be safe and reliable, and ensure synchronous operation with the motor. 4.7.2 The gear mark of the eccentricity should be clear and accurate, and the numerical mark should be aligned with the mark. 4.7.3 When adjusting the eccentricity, the movable eccentric block should be flexible and free of jamming. The eccentric block should be locked reliably after adjustment. 4.7.4 The bearings should be sealed against dust and the grease should be clean. 4.7.5 The vibrator should have steering instructions.
4.7.6 The motor should comply with the relevant standards. 4.8 Control box
4.8.1 During the vibration aging process, the control box should be able to track and draw the amplitude-time curve (At). After completing the specified time alarm aging, it will automatically record and draw the vibration aging curve at the same origin. Draw a pre-oscillation forehead scan curve and a post-oscillation forehead scan curve that can be identified (such as color change). 4.8.2 The display and records of each part of the control box should be clear and complete. 4.8.3 Each control button or button of the control box should be flexible and reliable. 4.8.4 When overcurrent occurs, the machine should automatically stop and display. When the timer time of the control box drops to zero, it should automatically stop. 4.8.5
4.8.6 When pressing the up or down button, the motor speed should be increased or decreased by 1r/min. 4.8.7 The acceleration display accuracy of the control box is according to formula (1): a =± (2. 5% B +d)
In the formula, Aa--acceleration display accuracy, m/s\; B-input Nominal acceleration value of voltage, m/s\; d-resolution, m/s.
4.9 Dry running test
4.9.1 Carry out dry running test at the minimum eccentricity and large rotation speed. 4.9.2 All rotating parts should be flexible, without stagnation or abnormal sound. 4.9.3 In the following situations, the amplitude-frequency curve (A-) should be automatically recorded and drawn: a) During manual scanning:
b) During automatic scanning.
4.9.4 Fasteners should be firm and not loose.
4.9.5 The noise of the device should not be greater than 85dB(A). 4.10 Load operation test
4.10.1 An empty operation test should be carried out before the load operation test. 4.10.2 Under the condition of maximum gripping force, the power of the motor should not be greater than its rated power. 4.10.3 The steady speed accuracy of the device should not be greater than 2r/min. 4.10.4 Under the condition of resonance rate, the acceleration tolerance of the same peak value should not be greater than 40m/s. 4.10.5 During the alarm aging process, the current of the motor should not have an upward trend. 5 Test methods
5.1 Overcurrent test
(1)
Increase the eccentric block of the vibrator to the required gear, manually or automatically adjust the motor speed. When the motor current reaches When the overcurrent protection value reaches the overcurrent protection value, it should automatically stop and display. After automatic shutdown, it should work normally when restarted. 5.2 Automatically record and draw the amplitude-grain rate curve (A-) Test face Install the vibrator at the appropriate position of the vibrated test piece, and adjust the eccentric block to the appropriate gear. 5.2.1 During manual scanning, increase the speed from the starting speed to a speed not greater than 12 r/min per second to the maximum speed of the chamber, and scan out the first-order resonance peak of the specimen.
5. 2. 2
During automatic scanning, the motor automatically rises from the starting speed to the maximum speed, and the drawing pen automatically draws the A-curve. Repeat the above J8/T5925.2—1998
Test, automatically identify (such as color change) and draw the A-curve. At this time, the device should work normally. 5.3 Noise shall be measured according to the provisions of JB/T6331.2. 5.4 Determination of the steady speed accuracy of the device
Install the vibration box on the specimen to be moved, adjust the eccentric block to the appropriate gear, increase the motor speed to close to the natural frequency of the specimen, and adjust the timer to 30 minutes .Use a digital tachometer to measure the speed of the motor, and record the speed displayed by the motor and the control box every 1 minute. The steady speed accuracy of the device is the greater of the following: a) The difference in speed of the motor;
b ) The difference in speed displayed on the control box;
c) The difference in average speed between the motor and the average speed displayed on the control box. Note that the average moving speed is the average value of its maximum and minimum conversion. 5.5 Acceleration Display Accuracy Test
Use a standard signal generator to output a sinusoidal signal of about 100Hz, and input it to the acceleration display through a 100PF capacitor. The input voltage is 0.5,1,0,1.5.2.When the voltage is 0V, record the corresponding digital display value of acceleration, calculate according to formula (2), formula (3), formula (4) and formula (5), and take the maximum deviation as the acceleration display accuracy of the device. s.=a./V.
Where: S.
a.
v
Where: S,-
Where: B.—
device acceleration sensitivity, (m/s\)/V;-corresponding digital display value of acceleration of the 1st input voltage, m/s\;!th input voltage, V.
S,
device acceleration sensitivity average value, (m/s*)/V. B, = SV
Nominal acceleration value of the 1st input voltage, m/s. Au, (B, a,) + d
Wherein: Aa.-acceleration deviation of the /th input voltage value, m/s\; (2)
(3)
（4）
(5)
d.----Same as formula (1), when (B,-a.) is zero, the sign can be positive or negative, and when (B.一a.) is not zero, the sign should be consistent with (B,一a.).
5.6 Under the condition of resonant frequency, the acceleration tolerance test of the same value is carried out according to the requirements of the technical documents of the device. Select the appropriate test piece (stress-free or aged treatment is recommended). Under the same condition (same support and exciting force, and the dynamic characteristic error of the two measuring points is the smallest), use the device and the vibration measurement system to scan and record the amplitude-rate curve of the test piece, and measure the acceleration difference between the device and the vibration measurement system at the same resonant peak (first-order spectral vibration frequency or first-order harmonic frequency or second-order vibration frequency).
According to the above method, five resonant peaks are measured, and the maximum difference is taken. These five resonant peaks can be any of the following forms:
a) Resonant peaks of different test pieces:
b) Spectral vibration peak values ??of the same test piece but different exciting force (at least one gear difference): c) Combination of a) and b),
5.7 The motor is tested according to relevant standards. 6 Inspection rules
6.1 Factory inspection
3
JB/T5925.2—1998
6.1.1 Each device shall be inspected and qualified before leaving the factory. 6.1.2 Factory inspection shall be carried out according to the items in 4.4, 4.6, 4.7.1~4.7.5, 4.8, 4.9.1~4.9.4 and 4.10, and the inspected items shall be qualified.
6.2 Type inspection
6.2.1 Type inspection shall be carried out in any of the following situations: a) During the trial production and identification of new products or the conversion of old products; b) After formal production, if there are major changes in structure, materials, and manufacturing processes; c) During normal production, type inspection shall be carried out once a year; d) When the device is shut down for more than one year and resumes production; e) When the national quality supervision agency puts forward type inspection requirements. 6.2.2 During type inspection, the number of units inspected each time shall be 10% of the monthly batch, but shall not be less than two units. 6.2.3 Type inspection items shall be all items specified in this standard, and all items inspected shall be qualified. Packaging, marking and storage and transportation
The packaging, marking and storage and transportation of the device shall comply with the provisions of 7.1 to 7.5 of JB1644-91. 4
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