收获设备——切割元件的要求——第二部分：大型旋转割草机上使用的刀片

[中文适用范围]： 本文件规定了作为切割元件用于大型旋转割草机（根据ISO 4254-13定义）的刀片的要求，这些刀片用于通过冲击力碎裂作物残渣、草坪和小灌木。 [外文原描述]： This document specifies requirements for blades used as cutting elements on large rotary mowers (as defined in ISO 4254 - 13 ) for shredding crop residue, grass and small brush by impact. It specifies requirements for testing and marking of such blades. This document is not applicable to blades used on: — rotary disc mowers, rotary drum mowers, and flail mowers designed for forage crop harvesting as covered by ISO 4254 ‑ 12 ; — arm-type large rotary mowers; — pedestrian-controlled motor mowers; — lawn mowers covered by the ISO 5395 series . NOTE 1 The main purpose of this document is to set material characteristics. Blades on large rotary mowers are exposed to considerable centripetal forces and impacts with foreign objects. A bend test and Charpy impact test to check the brittleness and toughness of the material are therefore included in this document. NOTE 2 This document does not specify dimensional requirements.