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1、International Standard f 3 18912 0 * 4 4iiii INTERNATIONAL ORGANIZATION FOR STANOARDIZATION*MEWYHAPOt4AR OPrAHH3AUHR IlOCTAH,lAPT!43AWlM*ORGANl.SATlON INTERNATIONALE DE NORMALISATION Sockets for wire ropes for general purposes - Part 2: Special requirements for sockets produced by forging or machine
2、d from the solid Douilles pour csbles en acier d usages courants - Partie 2: Exigences particuli a minimum value of 0,020 % metallic aluminium is given for guidance. Within the above limitations, it is the responsibility of the socket-maker to select steel so that the finished socket, suitably heat-
3、treated, meets the mechanical properties specified in this part of IS0 3189. 4.2 Heat treatment 3 General conditions of acceptance Sockets shall comply with the requirements of IS0 3189/l as well as with those in this part of IS0 3189. 4 Materials and heat treatment 4.1 Quality of material The steel
4、 used shall be produced by the open hearth or electric process, or by oxygen blown process. It shall be fully killed and, when heat-treated, be capable of pro- ducing in the finished socket the mechanical properties re- quired by this specification. In its finished state as supplied to the socket-ma
5、ker, the steel shall meet the following requirements, as determined by check analysis on the finished socket, Sockets shall, after forging or gas cutting, be subjected to a suitable heat treatment. 5 Socket manufacture Sockets complying with this part of IS0 3189 shall be (open) type I or (closed) t
6、ype II, and shall conform to the critical dimensions specified in IS0 3189/l (see table 1 and figures 1 and 2). 5.1 Bodies Bodies for this type of socket shall be produced in one piece by drop forging, hand forging or machining from the solid; the body shall be neatly and cleanly made. All flashes o
7、r fins pro- duced in manufacture shall be removed. All sharp edges shall be suitably radiused. Welding shall not be permitted. 1 -,-,- IS0 3189/2-1985 (E) For bodies machined from the solid, machine gas cutting may be used to assist in rough shaping. An adequate excess of material shall be left afte
8、r gas cutting for the removal of surface defects by machining or, in the case of the edges of the lugs and the continued edges around the top of the basket, by grinding. The pin holes shall be drilled or otherwise machined in one operation to ensure, as far as is practicable, that the centreline of
9、the holes is at right angles to the centreline of the socket basket. 5.2 Pins The pins shall be forged, forged and machined, or machined from the bar, and may be threaded or plain, according to the purchaser s requirements. The length of the plain portion of a threaded type pin shall be such that th
10、e nut will tighten against the shoulder of the pin and not against the outside face of the socket lug. The threads on pins and associated nuts shall comply with the coarse pitch series, specified in IS0 261, and tolerance class 6g, specified in IS0 965. A suitable safety device, such as a split cott
11、er pin, shall be provided to prevent nuts accidentally becoming displaced. 6 Special quality control for forged sockets and sockets machined from the solid The general quality control requirements specified in IS0 3189/l shall be met. In addition, if requested by the pur- chaser, the following tests
12、 shall be carried out. 6.1 Magnetic flaw or dye penetrant method If requested by the purchaser, each socket shall be subjected to an approved method of particle crack detection. All external and internal surfaces shall be examined, and cracks, rips or other detrimental defects shall not be accepted.
13、 6.2 Radiographic tests If requested by the purchaser, radiographic tests shall be car- ried out. The number of samples shall be in accordance with the fqllowing table. Lot or batch size (Number of sockets) Sample size (Number of sockets) 2to 8 2 9to 15 3 16 to 25 5 26 to 50 8 51to 90 13 91 to 150 2
14、0 151to 280 32 281 to 500 50 501 to 1200 80 1 201 to 3 200 125 3201 to10000 200 Acceptable levels of defect should be agreed between the purr chaser and the manufacturer. 6.3 Ultrasonic tests If requested by the purchaser as an alternative to the magnetic flaw or dye penetrant method and the radiographic test, the sockets shall be subjected to ultrasonic tests. In such cases, the test method and the acceptable levels of defect shall be the subject of agreement between the purchaser and the manufac- turer. 2 -,-,-