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1、样品检测端面尺寸对布氏硬度检测结果的影响一、背景实际检测工作中，需要检测布氏硬度的衬套、齿环类部分产品由于产品本身尺寸 限制，壁厚尺寸较小，不完全满足 GB/T 231.1-2009 标准中压痕距试样边缘距离的要求。 希望通过实验调查，掌握检测端面尺寸对布氏硬度检测结果的影响。二、目的验证样品检测端面尺寸对布氏硬度检测结果的影响。三、方案3.1 选择硬度值在 180HBW2.5/62.5 左右的标准硬度块，模拟样品端面情况（样品 端面圆周尺寸满足要求，径向尺寸不满足要求）将硬度块用线切割分割成长条状，宽 度从 0.8mm 到 4.0mm，硬度块切割图纸如下所示。使用山东莱州华银生产的 HBRV
2、- 187.5 布洛维硬度计检测不同尺寸的硬度值，进行数据对比分析。图 1. 标准硬度块线切割示意图3.2 选择一组（5 件）6800 管段，原始壁厚约 4.6mm，硬度值约 180HBW2.5/62.5，计算可得出样品端面尺寸3.4 即可满足 GB/T 231.1-2009 标准中压 痕距试样边缘距离的要求。用山东莱州华银生产的 HBRV-187.5 布洛维硬度计进行硬 度检测，样品先检测原始壁厚硬度，然后逐次加工壁厚至 4.0、3.8、3.6、3.21.4mm，由于管材端面自外圆到内孔，硬度值逐渐下降，为确保 排除检测部位的影响，使检测部位始终在样品端面靠近心部处，加工壁厚时应从内孔 和外
3、圆同步加工，每加工一次壁厚检测 3 个点，对检测完的数据进行对比分析。四、实验过程4.1 标准样品线切割，切割后的标准硬度块如图 2：图 2. 标准硬度块线切割效果图4.2 标准样品检测对切好的标准硬度块进行检测，检测设备为：HBRV-187.5 布洛维硬度计，检测 方法为 GB/T231.1-2009 金属材料 布氏硬度试验方法，每个尺寸的切条检测 5 个点， 检测后样品如图 3：图 3. 标准硬度块检测后标准硬度块布氏硬度检测结果如表 1 所示：表 1. 标准硬度块布氏硬度检测结果切条宽度/mm12345平均值证书值允许偏差范围0.8 127125126126128126.4182177.
4、5186.5 1.0 138140138140139139182177.5186.5 1.2 152152153153154152.8182177.5186.5 1.4 163164164166165164.4182177.5186.5 1.6 170165172169172169.6182177.5186.5 1.8 175177177175176176182177.5186.5 2.0 179182180179180180182177.5186.5 2.2 181183181180179180.8182177.5186.5 2.4 181182183182180181.6182177.51
5、86.5 2.6 182181184179180181.2182177.5186.5 2.8 182185183181181182.4182177.5186.5 3.0 181183182181181181.6182177.5186.5 3.2 182182183180182181.8182177.5186.5 3.4 181182183183181182182177.5186.5 3.6 181182182182181181.6182177.5186.5 3.8 184183183183183183.2182177.5186.5 4.0 183182181181182181.8182177.
6、5186.5 4.0182185184186186184.6182177.5186.54.3 管段样品检测对选好的 5 件管段样品进行检测，检测设备为：HBRV-187.5 布洛维硬度计，检 测方法为 GB/T231.1-2009 金属材料 布氏硬度试验方法，每件样品每个尺寸的壁厚检 测 3 个点，检测结果见表 2表 7 所示：表 2. 1#管段样品布氏硬度检测结果管材壁厚/mm123平均值4.6 177.9429089173.679936178.807353176.810066177 4.0 172.8857503177.0846025176.2323758175.4009095175 3.
7、8 174.5459328174.5459328172.0656598173.7191751174 3.6 172.474988171.24611172.4723763172.0644915172 3.4 171.2486945176.2350717171.6551655173.0463106173 3.2 170.4348553174.1293574172.8857503172.483321172 3.0 172.474988171.6551655170.4348553171.5216696172 2.8 171.2486945172.8857503172.0630572172.065834
8、172 2.6 168.0372343167.6407873169.2298011168.3026076168 2.4 171.2486945169.2298011171.6551655170.7112204171 2.2 168.4375836166.4646205170.0326248168.3116096168 2.0 164.9135466170.4348553167.6432922167.663898168 1.8 164.9135466166.0760834165.6864158165.5586819166 1.6 162.2510174162.2510174163.0056002
9、162.502545163 1.4155.6870107155.3348374157.1120423156.0446301156表 3. 2#管段样品布氏硬度检测结果管材壁厚/mm123平均值4.6 177.9429089179.6779935175.8098675177.81025661784.0 177.5143545175.3861714173.7142433175.53825641763.8 178.3729879177.0873176177.0846025177.51496931783.6 172.474988175.8098675175.3861714174.5570091753.
10、4 173.7142433174.5485908176.2350717174.83263531753.2 174.1293574175.3861714176.6590855175.39153811753.0 174.1293574174.1293574175.8098675174.68952751752.8 172.474988174.9666436173.7142433173.7186251742.6 171.2486945184.2355645173.2979533176.26073751762.4 168.8292126172.8857503171.24611170.9870243171
11、2.2 171.6551655173.2979533170.4348553171.79599141722.0 169.2298011171.652572168.432539169.77163741701.8 169.2298011167.6407873170.0326248168.96773771691.6 166.0736129165.3005441163.0056002164.79325241651.4157.1120423159.283434156.8164247157.7373004158表 4. 3#管段样品布氏硬度检测结果管材壁厚/mm123平均值4.6 172.885750317
12、8.3757322174.4343487175.23194371754.0 174.9666436173.2979533173.7116039173.99206691743.8 175.8098675173.7142433170.6969274173.40701271733.6 171.6551655172.0656598172.8857503172.20219191723.4 172.474988172.0656598172.474988172.33854531723.2 172.8857503172.474988172.0656598172.47546611723.0 173.714243
13、3173.2979533172.0630572173.02508461732.8 172.474988171.6551655174.1293574172.75317031732.6 170.0326248171.6551655172.4723763171.38672221712.4 172.474988168.8292126172.4723763171.2588591712.2 169.6292402167.6432922171.2486945169.50707561702.0 168.432539167.2482101168.432539168.03776271681.8 167.64329
14、22166.0736129166.0736129166.59683931671.6 162.6288635163.0056002165.2980905163.64418481641.4154.2830876145.2619952158.194568152.5798836153表 5. 4#管段样品布氏硬度检测结果管材壁厚/mm123平均值4.6 175.8098675178.807353179.6779935178.09840471784.0 176.2350717177.9429089176.65638176.94478691773.8 175.3861714177.9429089175.8
15、098675176.37964931763.6 173.2979533172.8857503174.9666436173.71678241743.4 175.3888483177.0846025175.3861714175.95320741763.2 173.7116039175.3861714176.2350717175.1109491753.0 174.5485908172.4723763174.9666436173.99587021742.8 173.7142433172.8857503173.7142433173.43807891732.6 174.1293574172.0630572
16、171.24611172.47950821722.4 173.7142433172.0630572172.474988172.75076281732.2 173.7142433172.8857503170.4348553172.34494961722.0 170.8410621171.6551655170.8410621171.11242991711.8 168.4350613167.2482101170.8410621168.84144451691.6 166.0760834160.7571679164.9135466163.91559931641.4156.3994059157.8317485152.5503455155.5938333156表 6. 5#管段样品布氏硬度检测结果管材壁厚/mm123平均值4.6 174.9613088176.2323758180.552096177.24859351774.0 174.1293574175.3861714174.5459328174.68715391753.8 177.0846025177.5143545174.96664
