2.1 材料:C67S、C75S、70(GB/T 1222)、65Mn(GB/T1222、GB/T 4357)、60Si2MnA(GB/T1222、GB/T 4357)。
2.2 热处理硬度
公称规格 | 维氏硬度HV | 洛氏硬度HRC |
d1≤48mm | 470~580 | 47~54 |
48mm<d1≤200mm | 435~530 | 44~51 |
200mm<d1≤300mm | 390~470 | 40~47 |
热处理硬度仅供生产工艺参考,不作为验收依据。 |
3. 性能
圆 锥 变 形
公称规格 | 试验力F(1±5%) N | h-s max | |
标准型(A型) | 重型(B型) | ||
d1≤22mm | 30 | 60 | b × 0.03 |
22mm<d1≤38mm | 40 | 80 | |
38mm<d1≤82mm | 60 | 120 | |
82mm<d1≤150mm | 80 | 160 | b × 0.02 |
150mm<d1≤300mm | 150 | 300 | |
h 一一 测试圆锥变形装置两板间的距离; s 一一 挡圈实际厚度; b一一 挡圈开口对面的径向宽度。 |
缝规间隐
公称规格d1 | 缝规间隙c |
d1≤100mm | 1.5×s |
100mm<d1≤300mm | 1.8×s |
3.4 弹性
3.4.1 孔用挡圈应进行弹性试验,试验后,将挡圈安装到最大直径d2 max的沟槽内,应在自重下保持不松动。
3.4.2 轴用挡圈应进行弹性试验,试验后,将挡圈安装到最小直径d2 min的沟槽内,应在自重下保持不松动。
3.4.3 开口挡圈应进行弹性试验,试验后,挡圈内径(d)应不大于沟槽直径(d2)的基本尺寸。
3.4 开口挡圈韧性
开口挡圈应进行韧性试验。试验后,挡圈不应断裂。
4. 表面处理
挡圈表面处理由制造者确定,并应符合以下规定。
表面处理
表面处理 | 防腐性能 |
磷化技术要求按GB/T 11376规定 | 8h无锈蚀,试验方法按GB/T 10125规定 |
氧化 | 供需协议 |
其他 | 供需协议 |
当采用上述以外的表面处理时,涂镀后挡圈厚度可能超过标准上限要求,因此,当计算沟槽尺寸时,应考虑这些因素。
5. 试验方法
5.1 孔用、轴用挡圈折弯试验
将挡圈的一半夹在两个钳口中,钳口的圆角半径应与挡圈厚度相同(r=s,见图)。然后反复轻捶打或者使用杠杆将挡圈弯曲至30°。
5.2 孔用、轴用挡圈变形试验
将挡圈放在两个平行板之间,并按下图加载达到F力时,测量h尺寸,计算(h-s)值。
5.3 孔用、轴用挡圈缝规试验
将挡圈放入缝规,见图。
说明:
c——缝规间隙;
s——挡圈厚度。
5.4 弹性试验
5.4.1 孔用挡圈
应使用符合JB/T 3411.48规定的安装钳将挡圈压缩到0.99×d1三次,或将挡圈穿过一个直径为0.99×d1的锥套(见下图)三次后,再安装到最大直径d2 max的沟槽内。
5.4.2 轴用挡圈
应使用符合JB/T 3411.47规定的安装钳将挡圈扩张到1.01×d1三次,或将挡圈穿过一个直径为1.01×d1 的锥棒(见下图)三次后,再安装到最小直径的d2 min的沟槽内。
5.4.3 开口挡圈
将开口挡圈装入试验轴上,然后拆下测量内径(d)尺寸。试验轴的直径应等于沟槽直径(d2)的基本尺寸。
5.5 开口挡圈韧性试验
将开口挡圈装在试验轴上,保持48h,目测检查。试验轴的直径应等于沟槽基本尺寸(d2)的1.1倍。
5.6 表面处理试验
磷化防腐性能应按GB/T 10125规定的中性盐雾试验进行试验。
6 表面缺陷
6.1 挡圈表面不允许有裂纹。
6.2 挡圈不允许有影响使用的毛刺。
7 验收检查
挡圈尺寸、性能特性及合格质量水平(AQL)按下表规定,其余验收检查按GB/T90.l规定。
尺寸特性
序号 | 尺寸特性 | 合格质量水平AQL |
1 | 挡圈厚度s | 1 |
2 | d3孔用、轴用挡圈的外径/内径 | 1 |
3 | D开口挡圈公称直径 | 1 |
4 | B开口挡圈开口宽度 | 1 |
5 | 其他 | 1.5 |
6 | 不合格紧固件* | 2.5 |
* 不合格紧固件——有一个或多个缺陷的紧固件。 |
性能特性
序号 | 性能特性 | 合格质量水平AQL |
1 | 孔用、轴用挡圈:折弯试验 | 1 |
2 | 孔用、轴用挡圈:圆锥变形试验 | 1 |
3 | 孔用、轴用挡圈:缝规试验 | 1 |
4 | 孔用、轴用挡圈:弹性 | 1 |
5 | 孔用、轴用挡圈:弹性试验 | 1 |
6 | 孔用、轴用挡圈:韧性试验 | 1 |
7 | 表面处理 | 1.5 |
8 | 其他* | 1.5 |
* 供需协议的其他性能特性。 |
8 验收检查
标志与包装按GB/T 90.2规定。
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