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发表于 2012-4-23 19:33:58
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本帖最后由 wangqinghua196 于 2012-4-24 19:09 编辑
烟不离手 发表于 2012-4-23 14:02
如果把“有害的温度梯度”理解成两个温度段之间的升温速度超过规定的要求,汪版主这么做无疑是没有问题 ...
我在115楼的回复是完全根据我自己的理解回帖的,是不正确的。因为看到烟不离手118楼的跟帖之后,我又仔细研究了一下《F 8000 heat treatment》中“F 8140 heat treatment temperature measurement and recording”的原文,我将原文翻译一下。
a) Temperature shall be measured by means of thermocouples placed on the load itself, on the component or part thereof, or fixed to blocks in close contact with the part. Thermocouples shall be shielded from radiation from the furnace and the atmosphere by a protective shield, and shall be sufficient in number:
- to ensure that the load, the entire component or the section being treated is within the required temperature range. In the case of heat treatment of a component or section thereof, at least one thermocouple shall be placed on one of the thickest parts of the component and at least one other on one of the thinnest parts. In the case of a load comprising several parts, at least one thermocouple shall be placed on one of the parts at the centre of the load,
- to verify the absence of harmful temperature gradients.
However, the Manufacturer or Supplier need not comply with the above requirements if the furnace is provided with special measuring devices not in contact with the load, component or part. In such a case, the Manufacturer or Supplier shall provide justification by demonstrating that the latter method is equivalent to the thermocouple method of measuring the temperature. Such justification shall be kept available for the Surveillance Agent. Temperature measuring devices not in contact with the load, component, or part shall be tested under operating conditions at less than 6-monthly intervals and whenever the heat conditions change (e.g. after furnace overhaul). This requirement shall not apply to heat treatment of component parts as defined in paragraph S 7542 b 2.
译文:请指正!
a)采用把热电偶放在装炉产品本体上的,在零件上或者(零件的)某部位上,或者在零件上固定一些紧密接触的(测量)块的方法测量温度。热电偶(测量端)应该测量工件的本体温度,而不是直接测量来自炉子的辐射的温度和气氛的直接辐射的温度(意译),且要有足够数量热电偶:
——确保装炉产品,整个组件或者待处理的部分在要求的温度范围之内。对于要热处理的一组零件或部位,至少有一只热电偶放置在这组零件上的最厚部位之一的地方,和至少有另一只热电偶放置在这组零件上的最薄部位之一的地方。一炉产品有几个部分组成的情况下,在装炉产品中心部位的几处位置之一处至少放置一只热电偶。
——鉴定没有有害的温度梯度。
不过,如果炉子是采用非接触(工件)式的专用测温装置,制造商或供应商就不需要遵守上面的要求。在这种情况下,制造商或供应商应该提供正当性证明来证明后一种方法等效于前述的接触式热电偶的测温方法。此证明要提供给监督者使用。非接触式测温装置应该在工作条件下,每间隔6个月试验一次,且每当(炉子)加热条件改变时(例如:炉子大修之后)(也要进行试验确认)。S7542b2章节中规定的部件热处理不适用于该要求。
根据此段文字就好理解了,就是说采用非接触式的热电偶控温的话,只要同时带入接触式的热电偶做比较就可以证明了。这个在一张餐巾纸的69楼帖子中提到的方法,就是这个文字中提到的“正当性证明”来证明其后一种方法的等效性的最佳方法。因此就不存在怀疑“有害的温度梯度”了。
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