SAE J 1405-2012 Optional Test Procedures for Hydraulic Hose Assemblies《液压软管组件的选定试验规程》.pdf

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1、 _ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising ther

2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this

3、publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49

4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/J1405_201701 SURFACE VEHICLE RECOMMENDED PRACTICE J1405 JAN2017 Issued 1979-01 Revised 2012-05

5、 Reaffirmed 2017-01 Superseding J1405 MAY2012 Optional Test Procedures for Hydraulic Hose Assemblies RATIONALE J1405 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE The procedures contained in this SAE Recommended Practice have been developed to establish uniform methods

6、 for impulse and high temperature circulation testing of hydraulic hose assemblies under special conditions not specified in SAE J343 for SAE J517 hoses. Basic test procedures are to be in accordance with SAE J343 except as modified in this document. 2. REFERENCES 2.1 Applicable Documents The follow

7、ing publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA a

8、nd Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J343 Test and Test Procedures for SAE 100R Series Hydraulic Hose and Hose Assemblies SAE J517 Hydraulic Hose SAE J1176 External Leakage Classifications for Hydraulic Systems 3. OPTION I - COMPARATIVE FLEX IMPULSE PROCEDURE 3.1 Purpose To gen

9、erate comparative impulse test data, with and without flexing. This test procedure minimizes impulse test variables to provide comparative data between flexing and nonflexing to determine the effect on the ultimate life of hose. This test is not a requirement for SAE J517. 3.2 Test Procedure For opt

10、imum validity of comparison, test specimens should be cut from a continuous length of hose with alternate samples along the length designated for flexing and nonflexing impulse test. Those specimens designated for nonflexing should be tested in accordance with SAE J343. Those specimens designated fo

11、r flexing are to be made up with free hose length in accordance with the following equation: Free hose length = 4.142 (minimum bend radius) + 3.57 (hose O.D.) (Eq. 1) Performance of the flex-impulse test requires a supplementary rig capable of moving one test manifold in a continuous circular patter

12、n as shown in Figure 1. This manifold is geared so that the center lines of the hose fittings at hose attachment stay parallel at all times. A variable drive is provided, and the number of revolutions per minute are to be controlled to, 36% 2% of the impulse cycles per minute. This maintains a propo

13、rtionality between the number of cycles of flexing and impulse and assures that the test specimen is in a different configuration of each succeeding impulse. FIGURE 1 - FLEX IMPULSE TEST HOSE GEOMETRY The vertical centerline of a stationary manifold is positioned a distance “A“ from the center of re

14、volution of the revolving manifold. This distance was determined empirically such that the test specimen is subjected to back bending motion near each fitting with the radius of bend at that point being greater than the applicable SAE minimum bend radius. However, when the revolving manifold reaches

15、 the position nearest the stationary manifold, the bend radius1 inside the loop is smaller than the applicable SAE minimum bend radius1. Distance “A“ is calculated with the following equation: 1.75 (minimum bend radius) + 1 (hose O.D.) (Eq. 2) 1 Violation of the minimum bend radius for this test doe

16、s not imply that such violation is recommended in applications. _SAE INTERNATIONAL J1405 JAN2017 2 of 5Specimens for flex-impulse testing should be mounted with straight end fittings on the rig as described above using care to avoid imparting twist to the hose. (Angular fittings may be used, provide

17、d they are installed in such a position to assure the hose travel and geometry of Figure 1.) A like number of samples, preferably not less than three, should be tested simultaneously and should be run to failure. To accelerate completion of the test for comparative purposes, a pressure based on actu

18、al burst values of the hose is recommended, with flexing and nonflexing specimens to be tested at the same pressure. Suggested procedure is to first determine the average burst strength for the test length of hose and from this calculate the impulse test pressure as 35% of average burst. If this tes

19、t procedure does not produce failures within the desired range, a higher or lower percentage may be used. 4. OPTION II - FLEX IMPULSE TEST 4.1 Purpose To establish requirements for impulse testing with the addition of flexing. This is a specialized test which is not a requirement of SAE J517, nor is

20、 it specified in SAE J343. It is intended to provide a standard method to flex-impulse hose assemblies when flexing is deemed necessary. 4.2 Test Procedure Four unaged hose assemblies for flexing are to be made up with free hose length in accordance with the following equation: Free hose length = 4.

21、142 (minimum bend radius) + 3.57 (hose O.D.) (Eq. 3) Performance of the flex-impulse test requires a supplementary rig capable of moving one test manifold in a continuous circular pattern as shown in Figure 1. This manifold is geared so that the center lines of the hose fittings at hose attachment s

22、tay parallel at all times. A variable drive is provided, and the number of revolutions per minute are to be controlled to 36% 2% of the impulse cycles per minute. This maintains a proportionality between the number of cycles of flexing and impulse and assures that the test specimen is in a different

23、 configuration on each succeeding impulse. The vertical centerline of a stationary manifold is positioned a distance “A“ from the center of revolution of the revolving manifold. This distance was determined empirically such that the test specimen is subjected to back bending motion near each fitting

24、 with the radius of bend at that point being greater than the applicable SAE minimum bend radius. However, when the revolving manifold reaches the position nearest the stationary manifold, the bend radius inside the loop is smaller than the applicable SAE minimum bend radius.2 Distance “A“ is calcul

25、ated with the following equation: 1.75 (minimum bend radius) + 1 (hose O.D.) (Eq. 4)Specimens for flex-impulse testing should be mounted with straight end fittings on the rig as described above using care to avoid imparting twist to the hose. (Angular fittings may be used provided they are installed

26、 in such a position to assure the hose travel and geometry of Figure 1.) 4.3 Test Requirements The hose assemblies shall be tested at the impulse pressures, temperatures and minimum bend radii, for the minimum number of impulse cycles, as specified in SAE J517 for 100R series hoses. Other test param

27、eters, as agreed upon by the supplier and user may be used. 2 Violation of the minimum bend radius for this test does not imply that such violation is recommended in applications. _SAE INTERNATIONAL J1405 JAN2017 3 of 55. OPTION III - COOL DOWN LEAKAGE TEST 5.1 Purpose To establish requirements for

28、performing a cold start leakage test to be used in conjunction with both flexing or nonflexing impulse tests. 5.2 Test Procedure The impulse test unit shall be shut down at 40% 10% and 90% 10% of the required number of impulse cycles and allowed to cool until the test oil and hose assemblies reach a

29、 temperature of 30 C 3 C (85 F 5 F). Accelerated cool down procedures, i.e., fans, heat exchangers, etc., may be used to speed the cooling process. Check test assemblies to assure they are clean and dry. With oil heater turned off, resume the test and observe and note leakage for 1000 impulse cycles

30、. The acceptable rate of leakage shall be as agreed upon by the supplier and user. (See SAE J1176 for leakage classes.) After completing the 1000 impulse cycles, turn on oil heater and continue the impulse test. If leakage is noted during the cool down cycle, notation shall also be made as to whethe

31、r or not a seal-off was effected as the temperature came back up. Results are applicable only to the specific hose construction and size, hose fitting design and size, and fitting assembly technique. 6. OPTION IV - HIGH TEMPERATURE CIRCULATION TEST 6.1 Purpose To establish a procedure for testing an

32、d evaluation of hose assemblies for use in high temperature systems, using petroleum or synthetic based hydraulic fluids, with a maximum temperature rating of 150 C (302 F). Hose performance, dimensions, identification and fitting configurations shall be agreed upon by the supplier and user. 6.2 Tes

33、t Procedure A minimum of two hose assemblies having at least 355 mm (14 in) length of free hose between hose fittings shall be mounted on a circulating oil test unit in a straight configuration. The ambient temperature shall be 93 C 11 C (200 F 20 F) and the oil temperature 150 C 2 C (302 F 3.6 F) b

34、etween inlet and outlet. Oil conforming to MIL-L-2104 or equivalent synthetic oil SAE 10W-30 shall be circulated through the hose assemblies at a pressure between 0.35 and 0.7 MPa (50 to 100 psi). Entrained air in the oil shall be kept to a minimum. Caution shall be exercised so that the hose assemb

35、lies do not come into contact with the heating elements and are located to permit good air circulation. The petroleum based test fluid shall be changed every 375 h 25 h, for synthetic fluids use the fluid manufacturers recommendation. Tests are to be run continuously except for oil changes and addit

36、ion or removal of samples. All shutdown time is to be recorded. After 750 h 5 h, the test assemblies shall be removed, the oil drained, and allowed to cool for a minimum of 4 h. The samples shall then be bent around a mandrel equal to the minimum bend radius of the hose within a time of 8 to 12 s an

37、d examined visually for cover cracks. No cracks are permitted. The assemblies shall then be subjected to Proof Test based upon either the hose maximum working pressure or an application pressure agreed to between user and manufacturer. Use SAE J343 for proof test procedures. There shall be no indica

38、tion of failure or leakage through the hose or at hose fitting juncture. All tests are to be completed within 24 h of removal of the samples from the circulating oil test unit. This shall be considered a destructive test and the samples shall be destroyed. _SAE INTERNATIONAL J1405 JAN2017 4 of 57. N

39、OTES 7.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete rev

40、ision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE FLUID CONDUCTORS AND CONNECTORS TECHNICAL STEERING COMMITTEE C2 HYDRAULIC HOSE AND HOSE FITTINGS COMMITTEE _SAE INTERNATIONAL J1405 JAN2017 5 of 5