第386章 钻头攻关
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第386章钻头攻关(第1/2页)
接下来几天,林远和老何一头扎进了铸造车间。
第一个难点是合金配方。老何从库房里翻出几块不同牌号的硬质合金坯料,林远在车间角落里支了个小坩埚炉,把合金坯料熔了重新调配。老何蹲在旁边看他往坩埚里加钴粉,拿一根细铁棍慢慢搅着,火光映在两人脸上,忽明忽暗。
“YG8钴含量百分之八,硬度高但韧性差,大口径钻头用还行。我们的小口径钻头冲击更集中,得把钴含量提到百分之十到十二。”林远把搅匀的合金液倒进模具里,冷却后取出来,拿锉刀在表面划了一下,锉刀打滑,只留下一道浅痕,“硬度够了。明天拿去打一下现场,看看韧性怎么样。”
老何推了推眼镜,拿卡尺量了量试块的尺寸,在笔记本上记了一笔。“钴含量百分之十,硬度HRC六十二,待现场测试。”
第二个难点是刀片几何角度。林远在砂轮机上把合金刀片磨成楔形,前角取了负六度。老何站在旁边看他磨,砂轮火花四溅,合金刀片的刃口在火花中一点点成型。林远把磨好的刀片举到灯光下看了看刃口,拿手指在刃口上轻轻抹了一下。
“负前角的刃口,切削效率比正前角低,但抗冲击能力强得多。蒸汽机有的是扭矩,效率低一点不怕,怕的是崩刃。这个角度碰上石英砂岩的裂隙,应力不会集中在刃口根部。”
老何接过刀片看了半天,推了推眼镜。“这个角度——大型钻机上从来没人用过。他们都用正前角,靠转速切削。”
“大型钻机转速高,正前角切削效率高。蒸汽机转速低,扭矩大,负前角靠犁开岩石,原理不一样。不能照搬大型钻机的设计。”
第三个难点是焊接。合金刀片和钢质钻头体热膨胀系数不一样,焊接应力控制不好,钻头一用就脱焊。林远采用了铜基钎焊,在钎料里加了少量镍粉提高润湿性。他把钻头体固定在台钳上,拿焊枪把钎料加热到暗红色,均匀地涂在焊缝上,然后把合金刀片压上去,保持压力等钎料冷却。焊完后用石棉布把整个钻头包裹起来,搁在炉子旁边缓慢冷却。
“石棉布保温,让焊缝慢慢冷,焊接应力就小了。”林远拍了拍手上的灰,“明天早上拆开看,焊缝没有裂纹就能拿去试。”
老何蹲下来看了看石棉布里裹着的钻头,站起来的时候膝盖咔嚓响了一声。“我在农机厂干了快二十年,头一回见这么讲究的焊接工艺。你这个钎料配方是自己琢磨的?”
“书上看的。铜基钎料加镍粉,能提高对硬质合金的润湿性。”林远把焊枪挂在工具架上,拿棉纱擦了擦手。
第一批试制的钻头出来后,林远和老何带着钻头去了吴队长的打井队。吴队长正蹲在钻井旁边抽烟,看见两人从三轮摩托车上跳下来,赶紧站起来把烟头扔了。
“新钻头做出来了?”吴队长接过林远递来的钻头,翻来覆去看了看,又拿手指敲了敲刃口,“这颜色不对嘛,咋是暗灰色的?之前的钻头都是白亮亮的。”
(本章未完,请点击下一页继续阅读)第386章钻头攻关(第2/2页)
“硬质合金的。别敲了,装上试试。”
吴队长把钻头交给队员装上去。蒸汽机点着了,飞轮嗡嗡地转起来,钻头咬着石英砂岩,声音跟之前不太一样——之前是尖锐刺耳的摩擦声,现在低沉了很多,像牛犁地时犁头划过泥土的声音,闷闷的,但很有力。钻头一寸一寸往下走,吴队长蹲在钻井旁边,眼睛一眨不眨地盯着钻杆。
打了一丈,钻头没有崩。打到一丈五,钻头还在往下走。打到两丈的时候,吴队长站起来拍了拍膝盖上的土,扭头朝老何喊了一声:“何工!两丈了!之前最多一丈五就崩,这回钻头还好好的!”他想了想,又转过头看着林远,“林工,你这钻头到底用的啥子材料?咋这么经打?”
“硬质合金。跟之前那些碳钢钻头不是一回事。”林远蹲在钻井旁边,等钻头提上来,翻看了一下刃口——只有正常磨损,没有崩刃,没有裂纹。
老何推了推眼镜,蹲下来拿卡尺量了量磨损量,站起来的时候手指微微发抖。不是紧张,是兴奋。他摘下眼镜擦了擦镜片,重新戴上,又拿起卡尺量了一遍,确认没有看错。
“磨损量不到碳钢钻头的三分之一。两丈了,刃口还正常。这个钻头——成了。”他转过头看着林远,嘴唇动了动,好像想说很多话,最后只说了两个字,“成了。”
林远接过钻头看了看刃口。“还要再试几个。不同岩层,不同深度,数据够了才能定配方。这个样品的钴含量是百分之十,回厂里再做一个百分之十二的,对比一下韧性。”
唐厂长是在办公室里听到消息的。老何连工装都没换,直接从打井队跑回来,推门进去的时候还在喘着粗气。唐厂长吓了一跳,说何工你这是咋了,跑这么急。老何把卡尺往桌上一搁,说新钻头打了三丈,正常磨损。唐厂长愣了好一阵,然后把搪瓷缸子往桌上一搁,站起来的时候椅子被碰得转了半圈。
“硬质合金钻头——搞成了?就这几天?三丈都没崩?”
“没崩。磨损量不到碳钢钻头的三分之一。配方和焊接工艺还得微调,但方向对了。”
唐厂长在办公室里原地转了一圈,然后走到门口朝车间方向吼了一嗓子:“老张!让食堂加两个菜!晚上我请客!”吼完又转回来,拍着老何的肩膀,“林远、老何,你们这回可是立了大功了!”
“不包括我。是林远同志搞的。合金配方、刀片角度、焊接工艺,全是他主导的,我就是打下手。”老何推了推眼镜,“他这手艺,放在哪个厂都是挑大梁的。”
接下来几天,林远又做了几个不同钴含量的样品,拿到打井队一一测试。钴含量百分之十的硬度和韧性平衡得最好,石英砂岩上能打三丈五,刃口磨损正常,没有崩刃,没有脱焊。钴含量百分之十二的韧性更好但硬度稍微差了一点,磨损量比百分之十的大了将近两成。最终定了百分之十的配方。
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