1.1 本规范 2. 涵盖瓦楞纸板生产机械中使用的两种辊。辊由锻造体和耳轴制成。耳轴可以用螺栓固定或收缩组装在阀体的一端或两端。可在阀体/耳轴接口处进行密封焊接。辊壳由下文所述的碳/锰或低合金钢制成，并在组装前进行热处理。压力辊可以按条件H进行表面硬化，也可以按条件S进行表面硬化。 补充要求S1和S3中规定了瓦楞辊的可选表面硬化。 1.2 根据本规范制造的瓦楞辊和压力辊不得超过30英寸。内径[760 mm]。辊体壁厚不得小于 1. / 12 内径或1英寸。[25 mm]，以较大者为准，但不得超过4 in。[100毫米]。瓦楞辊的壁厚在耳轴配合位置的瓦楞底部测量。 辊的最高设计温度（MDT）为600 华氏度[315度 °C]，最大允许工作压力（MAWP）为250 psi[1.7 MPa]。最低设计温度应为40℃ °F[4 °C]适用于厚度小于等于3英寸的辊壁。[75毫米]。对于厚度超过3英寸的辊壁。[75毫米]至4英寸。[100 mm]，最低设计温度应为120 °F[50 °C]。内外载荷共同作用下辊体上的最大应力限制在18 2级压力辊体为750 psi[129 MPa]，20 1000 psi[138 MPa]，适用于1级或2级1A、1B或5级压力或瓦楞辊体。 对于耳轴，内外荷载组合产生的最大应力限制为15 3或4级或20级为1000 psi[103.4 MPa] 000 psi[138 MPa]，仅适用于2级中的1A、1B或5级。耳轴不允许使用1级强度等级。 1.3 参考 表1 ，1A、1B或5级材料应用于制造波纹或压力辊壳，2级材料仅用于压力辊壳。耳轴应由1A、1B或5级锻件制成，强度等级为2级，受中脚注B的限制 表2 或3类或4类锻件。 1.4 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.5 除非订单规定了适用的“M”规格名称，否则材料应以英寸-磅为单位提供。 1.6 除本标准另有规定外，规范的所有规定 A788/A788M 申请 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification 2 covers two kinds of rolls used in machinery for producing corrugated paperboard. Rolls are fabricated of forged bodies and trunnions. The trunnions may be bolted or shrink assembled on one or both ends of the body. A seal weld may be made at the body/trunnion interface. Roll shells are made of carbon/manganese, or low alloy steel as hereinafter described, and are heat treated prior to assembly. Pressure rolls may be ordered surface hardened as Condition H, or without surface hardening as Condition S. Provision is made in Supplementary Requirements S1 and S3 for the optional surface hardening of corrugating rolls. 1.2 Corrugating and pressure rolls made to this specification shall not exceed 30 in. [760 mm] in inside diameter. The wall thickness of the roll body shall not be less than 1 / 12 of the inside diameter or 1 in. [25 mm], whichever is greater, but shall not exceed 4 in. [100 mm]. The wall thickness of the corrugating roll is measured at the bottom of the corrugations in the location of the trunnion fit. The maximum design temperature (MDT) of the roll is 600 °F [315 °C] and the maximum allowable working pressure (MAWP) is 250 psi [1.7 MPa]. The minimum design temperature shall be 40 °F [4 °C] for roll wall thicknesses up to 3 in. [75 mm]. For roll wall thicknesses over 3 in. [75 mm] to 4 in. [100 mm], the minimum design temperature shall be 120 °F [50 °C]. The maximum stresses on the roll bodies from the combined internal and external loading are limited to 18 750 psi [129 MPa] for the Class 2 pressure roll bodies, and 20 000 psi [138 MPa] for Class 1A, 1B, or 5 pressure or corrugating roll bodies in Grades 1 or 2. For the trunnions, the maximum stresses from the combined internal and external loading are limited to 15 000 psi [103.4 MPa] for Classes 3 or 4, or 20 000 psi [138 MPa] for Classes 1A, 1B, or 5 in Grade 2 only. The Grade 1 strength level is not permissible for trunnions. 1.3 Referring to Table 1 , material to Classes 1A, 1B, or 5 shall be used for the manufacture of corrugating or pressure roll shells, and Class 2 shall be used only for pressure roll shells. Trunnions shall be made from forgings in Classes 1A, 1B, or 5 in Grade 2 strength level as restricted by Footnote B in Table 2 or in forgings in either Class 3 or 4. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.5 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units. 1.6 Except as specifically required in this standard, all of the provisions of Specification A788/A788M apply. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.