Motorcycles and scooters to bearing technical conditions

1 the bearing should be according to the prescribed procedures approved product drawings and manufacturing technical documentation. 2 bearing roller made of GCr15 steel. 3 the tolerance grade of bearing steel ball diameter should be not less than 28, the logo according to the provisions of GB 308, ball hardness of HRC 62 ~ 66. 4 parts of basic bearing size tolerance grade shape and position tolerances according to GB 307. The provisions of 1. 5 bearing parts size is not note tolerance grade according to GB m class in 1804. 6 bearing parts shape position did not note tolerance grade according to GB 1184 in class B. 7 bearings can withstand axial static load should be no less than 16500 n; The axial dynamic load should not be less than 8300 n. 8 bearing parts surface are not allowed to have defects such as crack, rust, flash, burr; Roller surface are not allowed to have defects such as crack, sag, and rust. 9 bearing race and shaft washer is not permitted in the channel and bruised machining traces. 1 factory test sampling inspection scheme according to a sample plan in ZB J11020. Check for general inspection level Ⅱ. 2 to submit the factory test product batch and acceptable quality level ( AQL) Be determined by supply and demand both sides talks things over. 3 defective classification and project according to GB 2828, unqualified divided into class A and class B and class C, the project are shown in table 1. 1 for type testing should be bearing factory test qualified products with randomly selected, the number of samples shall not be less than 6 sets. 2 type testing if there is any item is unqualified, should take double the number of bearings, the unqualified project is the second interview. If still not qualified, unqualified for type testing. 1 bearing and rolling body appearance visual inspection. 2 bearing size shape and position tolerances using special fixture for testing. 3 ball size according to the provisions of GB 308. 4 ball hardness in accordance with the provisions of the JB 1255. 5 bearing axial static load and axial dynamic load of axial static load test in the universal testing machine; The axial dynamic load on bearing testing machine for testing. 4 inspection rules are divided into factory inspection and form. 3 all the items in table 1. 1 bearing one of the following circumstances, it shall conduct pilot test. 一) Trial production of new products or old products factory pattern evaluation; b） After the formal production, if any significant changes in structure, material, process, that may affect product performance; c) In the normal production regularly once every two years. d） Shut down after six months, when to resume production; e) Factory inspection result and differ from that of the last type of inspection; f) The state administration of quality supervision institutions during type test requirements are put forward. 2 type testing project in addition to the factory test project, should also include the bearing axial static load and axial dynamic load. 1 should be permanently marked on each bearing, its mark, mark the location, mark method should comply with the provisions of the JB/T 3574. 2 boxes outside surface should state: a) The product name; b） Factory name; c) Number of packages; d） Total weight; e) Manufacturing date; f) 'Handle with care', 'keep dry', etc; g） Performed by standard number. 1 bearing and ball cleaning, rust and the inner packing should comply with the provisions of the JB 3034. 2 bearing outer packing with carton or wooden case. 3 the bearing should be stored in ventilated, dry inside storeroom. Under the condition of normal safekeeping, manufacturer shall ensure that within one year from the date of the factory does not rust.