样品检测端面尺寸对布氏硬度检测结果的影响

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-187.5布洛维硬度计检

2、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

3、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 127125126126128126.4182177.5186.51.0 138140138140139139182177.5186.51.2

4、 152152153153154152.8182177.5186.51.4 163164164166165164.4182177.5186.51.6 170165172169172169.6182177.5186.51.8 175177177175176176182177.5186.52.0 179182180179180180182177.5186.52.2 181183181180179180.8182177.5186.52.4 181182183182180181.6182177.5186.52.6 182181184179180181.2182177.5186.52.8 1821851

5、83181181182.4182177.5186.53.0 181183182181181181.6182177.5186.53.2 182182183180182181.8182177.5186.53.4 181182183183181182182177.5186.53.6 181182182182181181.6182177.5186.53.8 184183183183183183.2182177.5186.54.0 183182181181182181.8182177.5186.54.0182185184186186184.6182177.5186.54.3 管段样品检测 对选好的5件管

6、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4.6 177.9429089173.679936178.807353176.8100661774.0 172.8857503177.0846025176.2323758175.40090951753.8 174.5459328174.5459328172.0656598173.71917511743.6 172.474988171.24611172

7、.4723763172.06449151723.4 171.2486945176.2350717171.6551655173.04631061733.2 170.4348553174.1293574172.8857503172.4833211723.0 172.474988171.6551655170.4348553171.52166961722.8 171.2486945172.8857503172.0630572172.0658341722.6 168.0372343167.6407873169.2298011168.30260761682.4 171.2486945169.2298011

8、171.6551655170.71122041712.2 168.4375836166.4646205170.0326248168.31160961682.0 164.9135466170.4348553167.6432922167.6638981681.8 164.9135466166.0760834165.6864158165.55868191661.6 162.2510174162.2510174163.0056002162.5025451631.4155.6870107155.3348374157.1120423156.0446301156表3. 2#管段样品布氏硬度检测结果管材壁厚/

9、mm123平均值4.6 177.9429089179.6779935175.8098675177.81025661784.0 177.5143545175.3861714173.7142433175.53825641763.8 178.3729879177.0873176177.0846025177.51496931783.6 172.474988175.8098675175.3861714174.5570091753.4 173.7142433174.5485908176.2350717174.83263531753.2 174.1293574175.3861714176.659085517

10、5.39153811753.0 174.1293574174.1293574175.8098675174.68952751752.8 172.474988174.9666436173.7142433173.7186251742.6 171.2486945184.2355645173.2979533176.26073751762.4 168.8292126172.8857503171.24611170.98702431712.2 171.6551655173.2979533170.4348553171.79599141722.0 169.2298011171.652572168.43253916

11、9.77163741701.8 169.2298011167.6407873170.0326248168.96773771691.6 166.0736129165.3005441163.0056002164.79325241651.4157.1120423159.283434156.8164247157.7373004158表4. 3#管段样品布氏硬度检测结果管材壁厚/mm123平均值4.6 172.8857503178.3757322174.4343487175.23194371754.0 174.9666436173.2979533173.7116039173.99206691743.8

12、175.8098675173.7142433170.6969274173.40701271733.6 171.6551655172.0656598172.8857503172.20219191723.4 172.474988172.0656598172.474988172.33854531723.2 172.8857503172.474988172.0656598172.47546611723.0 173.7142433173.2979533172.0630572173.02508461732.8 172.474988171.6551655174.1293574172.75317031732.

13、6 170.0326248171.6551655172.4723763171.38672221712.4 172.474988168.8292126172.4723763171.2588591712.2 169.6292402167.6432922171.2486945169.50707561702.0 168.432539167.2482101168.432539168.03776271681.8 167.6432922166.0736129166.0736129166.59683931671.6 162.6288635163.0056002165.2980905163.6441848164

14、1.4154.2830876145.2619952158.194568152.5798836153表5. 4#管段样品布氏硬度检测结果管材壁厚/mm123平均值4.6 175.8098675178.807353179.6779935178.09840471784.0 176.2350717177.9429089176.65638176.94478691773.8 175.3861714177.9429089175.8098675176.37964931763.6 173.2979533172.8857503174.9666436173.71678241743.4 175.3888483177.

15、0846025175.3861714175.95320741763.2 173.7116039175.3861714176.2350717175.1109491753.0 174.5485908172.4723763174.9666436173.99587021742.8 173.7142433172.8857503173.7142433173.43807891732.6 174.1293574172.0630572171.24611172.47950821722.4 173.7142433172.0630572172.474988172.75076281732.2 173.714243317

16、2.8857503170.4348553172.34494961722.0 170.8410621171.6551655170.8410621171.11242991711.8 168.4350613167.2482101170.8410621168.84144451691.6 166.0760834160.7571679164.9135466163.91559931641.4156.3994059157.8317485152.5503455155.5938333156表6. 5#管段样品布氏硬度检测结果管材壁厚/mm123平均值4.6 174.9613088176.2323758180.55

17、2096177.24859351774.0 174.1293574175.3861714174.5459328174.68715391753.8 177.0846025177.5143545174.9666436176.52186691773.6 175.3861714172.474988173.7116039173.85758781743.4 175.3888483171.652572174.5459328173.8624511743.2 173.7116039173.2979533174.1293574173.71297151743.0 172.8857503174.5485908172.

18、474988173.30310971732.8 170.0326248173.7142433175.80986751736 173.7142433171.6551655173.7142433173.0278841732.4 174.1293574173.7142433172.4723763173.4386591732.2 170.8410621173.2979533172.8857503172.34158861722.0 168.324135172.474988168.432539169.74388731701.8 167.6432922170.0326248168.

19、8292126168.83504321691.6 161.8768388165.2980905165.30054411644159.6511671145.5832085159.6511671154.9618476155表7. 5件管段样品布氏硬度平均值检测结果管材壁厚/mm123平均值4.6 175.9085489177.3546781177.8563317177.03985291774.0 175.3126347175.8195615174.9721071175.31263471753.8 175.5085347176.1609514174.1247402175.5

20、0853471763.6 173.2796125172.8964751173.8845091173.27961251733.4 174.0066299174.3172994174.0594659174.00662991743.2 173.8348491174.1349283174.3949849173.83484911743.0 173.3070523173.2206887173.1498823173.30705231732.8 173.0322574173.2215106173.8861537173.03225741732.6 172.2914919173.449948171.9920968

21、172.29149191722.4 171.8293051171.3444129172.0642032171.82930511722.2 170.860243170.7179139171.007356170.8602431712.0 169.2659231170.6931582168.7563943169.26592311691.8 167.7599493167.4142637168.2925857167.75994931681.6 163.8028145163.322484164.3046763163.80281451641.4 155.383499152.6590447156.8649095155.383499155五、数据处理5.1将标准硬度块不同尺寸标准硬度块的5个检测结果取平均绘制成曲线图，如图4：图4. 标准硬度块不同尺寸检测结果曲线图5.2 将5件管段样品不同壁厚布氏硬度值分别求平均，绘制成曲线图，如图59： 将5件管