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GB/T 19934.1-2021: Hydraulic fluid power - Fatigue pressure testing of metal pressure-containing envelopes - Part 1: Test method
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Hydraulic fluid power - Fatigue pressure testing of metal pressure-containing envelopes - Part 1: Test method
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GB/T 19934.1-2021
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| GB/T 19934.1-2005 | English | 559 |
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Hydraulic fluid power -- Fatigue pressure testing of metal pressure-containing envelopes -- Part 1: Test method
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Basic data | Standard ID | GB/T 19934.1-2021 (GB/T19934.1-2021) | | Description (Translated English) | Hydraulic fluid power - Fatigue pressure testing of metal pressure-containing envelopes - Part 1: Test method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J20 | | Word Count Estimation | 18,110 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 19934.1-2021: Hydraulic fluid power - Fatigue pressure testing of metal pressure-containing envelopes - Part 1: Test method
---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.
Hydraulic fluid power - Fatigue pressure testing of metal pressure-containing envelopes - Part 1.Test method
ICS 23.100.99
J20
National Standards of People's Republic of China
Replace GB/T 19934.1-2005
Hydraulic transmission metal pressure-bearing shell
Fatigue pressure test Part 1.Test method
(ISO 10771-1.2015, IDT)
Released on 2021-03-09
2021-10-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Test conditions 2
5 Test equipment and test preparation 2
6 Accuracy 2
7 Test procedure 3
8 Failure Criteria 4
9 Test report 4
10 Test description 5
11 Labeling instructions (quote this part) 5
Appendix A (Normative Appendix) Special requirements for hydraulic pumps and hydraulic motors 6
Appendix B (Normative Appendix) Special requirements for hydraulic cylinders 7
Appendix C (Normative Appendix) Special requirements for hydraulic pneumatic accumulators 10
Appendix D (Normative Appendix) Special requirements for hydraulic valves 12
Reference 13
Hydraulic transmission metal pressure-bearing shell
Fatigue pressure test Part 1.Test method
1 Scope
This part of GB/T 19934 stipulates that under continuous stable and periodic internal pressure load, the metal pressure of hydraulic components
The method of fatigue test of the shell.
This part is only applicable to those made of metal, working at a temperature that does not produce creep and low-temperature embrittlement, only bearing stress caused by pressure, and not
There are pressure-bearing housings of hydraulic components that have reduced strength due to corrosion or other chemical effects. The pressure-bearing shell may include gaskets, seals, and
Other non-metal parts, but these parts are not part of the pressure-bearing shell of the tested hydraulic component in the test (see 5.7).
This section does not apply to the piping components specified in ISO 4413 (such as pipe joints, hoses, hard pipes, etc.). Fatigue test for piping components
See ISO 6803 and ISO 6605 for test methods.
This section also specifies general test methods applicable to hydraulic components. For additional requirements and specific methods for various components, see this section.
Appendices or other standards.
The test pressure is determined by the user, and the evaluation method is described in ISO /T R10771-2.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
ISO 4413 General rules and safety requirements for hydraulic transmission systems and their components (Hydraulicfluidpower-General
rulesandsafetyrequirementsforsystemsandtheircomponents)
ISO 5598 Fluid power systems and components-Vocabulary (Fluidpowersystemsandcomponents-Vocabulary)
ISO 9110-1 Hydraulic Power-Measurement Technology Part 1.General (Hydraulicfluidpower-Measurementtech-
niques-Part 1.Generalmeasurementprinciples)
ISO 9110-2 Hydraulic Transmission Measurement Technology Part 2.Measurement of Average Steady-State Pressure in a Closed Circuit (Hydraulicfluid
power-Measurementtechniques-Part 2.Measurementofaveragesteady-statepressureinaclosed
conduit)
3 Terms and definitions
The following terms and definitions defined in ISO 5598 apply to this document.
3.1
Lower limit of cyclic test high pressure uppercyclictestpressure
pU
The minimum value of the high pressure range of the specified cyclic test pressure.
3.2
Lower cyclic test pressure upper limit lowercyclictestpressure
pL
The maximum value of the low pressure interval of the specified cyclic test pressure.
3.3
Cyclic test pressure range
Δp
During the fatigue test, the difference between the lower limit of the high pressure of the cyclic test and the upper limit of the low pressure of the cyclic test.
3.4
Pressure-containing envelope
Components that contain fluid under pressure and take fastening measures (such as bolts, welding, etc.).
Note 1.Gaskets and seals are not part of the pressure shell.
Note 2.Refer to Appendix A~Appendix D for the explanation of the pressure-bearing shell of various components.
4 Test conditions
4.1 Before the start of the test, the tested components and circuits should be exhausted.
4.2 The temperature of the oil in the tested component should be 15℃~80℃. The temperature of the tested component should not be lower than 15℃.
5 Test equipment and test preparation
5.1 The test device and test circuit should be in accordance with 7.1 and have the ability to generate cyclic test pressure.
5.2 The pressure sensor should be installed directly on the tested component or as close as possible to the tested component in order to record the effect on the tested component
The internal pressure situation. Any adverse effect of the installation of the sensor on the pressure-bearing shell shall be eliminated.
5.3 The pressurized medium should use non-corrosive hydraulic oil with a kinematic viscosity not higher than 60mm2/s within the test temperature range.
5.4 According to the design regulations, different pressures should be applied to different parts of the pressure-bearing shell.
5.5 The ratio of stress to pressure under static load conditions should be verified, and this ratio should also be reached under the test pressure cycle rate. Special attention should be paid
The influence of the comparison value in the following situations.
---Requires that the pressure must be transmitted to the test piece with tightly fitting parts;
---The test component with a larger volume;
---The hysteresis effect at the connection can significantly change the stress of the test piece.
This ratio can be verified with a strain gauge. When in use, the strain gauge should be set on the outer surface of the high strain area.
5.6 In order to facilitate the cycle test, some changes can be made to the tested components, but the changes should not increase the pressure bearing capacity of the pressure shell.
5.7 The gaskets and seals damaged during the test can be replaced, but after reassembly, the pre-tightening force of the pressure component is the same as before disassembly.
During the fatigue test, the pre-tightening force of the fastener may decrease. When the seal or gasket is replaced, the pre-tightening force of the fastener should also be set at this
Decrease the level.
5.8 During the test, the safety regulations required in ISO 4413 should be followed to protect the safety of test personnel and equipment.
6 accuracy
6.1 The accuracy of the measuring instrument should meet.
---Pressure. ±1.0% of the lower limit of the high pressure of the cycle test;
---Strain. ±1.0% of the strain value obtained at the lower limit of the high pressure of the cyclic test;
---Time. Resolution ±0.002s;
---Temperature. ±2℃.
6.2 When the frequency response range of the system composed of pressure sensor, amplifier and recording device is 0kHz~2kHz, the amplitude ratio is
0dB~-3dB.
6.3 Measuring instruments and measuring procedures shall comply with the requirements of ISO 9110-1 and ISO 9110-2.
7 Test procedures
7.1 Cyclic pressure test
7.1.1 Test pressure waveform
Within the time period specified in 7.1.2, the test pressure waveform should reach the lower limit of the cyclic test high pressure and the upper limit of the cyclic test low pressure.
The waveform can be any shape.
7.1.2 Pressure cycle test
The pressure cycle test requirements are as follows.
a) Lower limit value of high pressure of cyclic test (pU)
In the time period T1 (equal to or greater than 0.3T), the actual test pressure should not be less than the lower limit of the cycle test high pressure.
b) Pressure rise time period (TR)
During the time period (TR), the actual test pressure should be increased to the lower limit of the cyclic test high pressure, and should meet.
0.4T≤TR T1≤0.6T
c) Low pressure upper limit of cycle test (pL)
The upper limit of the low pressure of the cycle test should not be greater than 5% of the lower limit of the high pressure of the cycle test, unless otherwise specified in the appendix. In the loop
Within the time period T2, the actual test pressure should not exceed the upper limit of the low-pressure cycle test. T2 should meet.
0.9T1≤T2≤1.1T1
7.1.3 Number of test cycles
The number of test cycles should be in the range of 105 to 107.
7.1.4 Test frequency and time period (T1)
Under a given pressure amplitude, the fatigue life of the tested hydraulic component depends on the high-pressure time period (T1). Correspondingly, within a given T1
The test results of hydraulic components cannot usually be used to predict the number of cycles that the component can withstand in different time periods. In general,
The pressure cycle should meet f ≤3Hz or T1≥100ms, unless there is satisfactory test experience at higher frequencies, such experience should be reported in the test report.
It is indicated in the report.
7.2 General requirements
7.2.1 Use non-destructive test methods to verify the consistency of all tested components with their manufacturing instructions.
7.2.2 If necessary, metal balls or other similar equivalent loose fillers can be placed inside the tested component to reduce the volume of the pressure oil.
Product, but to ensure that the placed object does not prevent the pressure from reaching all test areas, and does not affect the fatigue life of the component (such as shot peening).
7.2.3 When hydraulic components have multiple chambers due to their design and their pressure-bearing capacity is different, the isolation part between the chambers should be used as one of the pressure-bearing shell
Part of the mechanical fatigue characteristics test (see Appendix A ~ Appendix D).
8 Failure criteria
The following conditions are judged as invalid.
--- Any external leakage caused by fatigue (under the conditions required by 5.5);
--- Any internal leakage caused by fatigue (under the conditions required by 5.5);
---Material fracture (such as cracks, etc.).
9 Test report
The test report should include the following.
a) The number of this part (GB/T 19934.1) and the identification of the appendix used;
b) Test location;
c) The identity of the test personnel and the test date;
d) The description (manufacturer, material) and production date of the tested component, or the serial number of the component;
e) The number of tested components;
f) Cycle test high pressure lower limit (pU) and cycle test low pressure upper limit (pL);
g) Cycle test frequency (f) and time period (T1);
h) The number of pressure cycles completed;
i) The type of hydraulic oil used for the test;
j) Typical cycle curve (pressure/time);
k) Hydraulic oil and ambient temperature;
l) Replace gaskets and seals, record the number of cycles, and re-establish the method of fastener pre-tightening;
m) Detect the frequency response of the instrument system and sensors;
n) Description (graphics and text) of any modifications made to the tested component to complete the test;
o) Other instructions.
10 Test description
Should specify the data in Chapter 9 a), d), f), g) and h) to illustrate the conditions of the fatigue pressure test.
11 Labeling instructions (quote this part)
When choosing to comply with this section, the following instructions should be used in test reports, product samples and sales documents. "Methods of fatigue stress test
Comply with GB/T 19934.1 "Fatigue Pressure Test of Metal Pressure Shells of Hydraulic Transmission Part 1.Test Methods". "
Appendix A
(Normative appendix)
Special requirements for hydraulic pumps and hydraulic motors
A.1 Overview
The corresponding specifications in this part of GB/T 19934 shall be implemented in accordance with the different requirements in A.2 and A.3.
The tested component should be fully assembled.
During the test, different cyclic test pressures can be applied to the oil inlet, the oil outlet and the high-pressure oil port.
Note. When conducting this test, an important basis for judging is whether the driving mechanism of the tested component rotates and generates high voltage by itself, or whether it does not rotate but
Pressure can be applied by an independent pressure source.
A.2 Test process
If you choose to apply pressure to multiple ports, you should select the phase relationship of the cyclic pressure of each port that can achieve the highest fatigue load.
If the shaft of the component under test is fixed and does not rotate, the angular position of the rotating component is very important for determining the load of the pressure-bearing shell and should be controlled.
The displacement of hydraulic pump and hydraulic motor is very important to determine the load of the pressure-bearing shell and should be controlled. If hydraulic pump and hydraulic motor need
To change the displacement, the pressure waveform and the displacement waveform should be recorded at the same time.
A.3 Test report
The following information should be added to the test report [including a)~o) in Chapter 9].
a) Whether the driving shaft is rotating;
b) If the shaft does not rotate, describe the angular position of the rotating component;
c) Whether the component under test is in pump mode or motor mode;
d) Speed and direction of rotation;
e) Displacement waveform and its phase relationship with pressure waveform (variable pump and variable motor);
f) The cycle test high pressure lower limit (pU) and cycle test low pressure upper limit (pL) of each pressurized port, the phase relationship of each pressurized port
And the pressure value applied to any other ports.
Appendix B
(Normative appendix)
Special requirements for hydraulic cylinders
B.1 Overview
B.1.1 This appendix specifies the fatigue pressure test method for the pressure shell of hydraulic cylinder, which is applicable to ISO standards (such as ISO 6020-1)
Designed hydraulic cylinders of the following types with a bore diameter of less than.200mm.
---Tie rod type;
---Screw type;
---Welding type;
---Other types of fastening connections.
B.1.2 This test method is not suitable for the following situations.
---Apply a side load on the piston rod;
--- Flexible deformation of the piston rod caused by load/stress.
B.1.3 The pressure-bearing shell of the hydraulic cylinder contains.
---Cylinder body;
---The front and rear end caps of the cylinder;
---Seal groove;
---piston;
---The connection of the piston and the piston rod;
---Any pressure-bearing components (such as buffer throttle valves, one-way valves, exhaust plugs, plugs, etc.);
---Fasteners (such as spring retainers, bolts, tie rods, nuts, etc.) for the front cover, rear cover, sealing groove, piston and fixed ring.
Note 1.Other parts, such as the bottom plate, mounting accessories and buffers, are not part of the pressure-bearing shell.
Note 2.Although the bottom plate is not a pressure-bearing component, but the test method described in this appendix can be used for durability fatigue test.
B.2 Test device for pressure-bearing shell of conventional hydraulic cylinder
The stroke of the hydraulic cylinder should be at least the length determined in Figure B.1.
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