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将拾震器通过上千公尺的深井放入地下,甚至座在玄武岩上去接收前兆的微弱信号以预报地震,这项地震科研工程遇到了一系列技术问题。其中关键之一是拾震器的予应力片弹簧的设计、选材、加工和热处理工艺。1976年3月以来,天津大学曾与天津地震工程研究所针对这个问题进行了一系列的试验研究工作。他们针对拾震器在深井中工作对弹簧所提出的特殊要求,先后选择变形强化合金3J23、马氏体效钢18Ni-300、恒弹性合金3J58、3J53、弹性合金3J3等材料,制造了5种形式的弹簧,进行性能测试,确定加工及热处理工艺及最后的实际下井试验。其中以3J58为重点研究和确定了弹簧的结构尺寸及较为适宜的热处理工艺。即对圆形片弹簧采用,1050℃,15分钟固溶处理、冷轧变形率60％线切割成型、再以700℃,2．5小时及650℃,2．5小时多次定型时效,经手工整形后350℃,2．5小时应力均匀化和100℃,30小时予松驰处理。经上述处理选出的弹簧,再对其工作参数进行标定装机,进行下井试验。1976年11月拾震器在902公尺深井下进行测震试验并工作一段时期,效果较好。
Putting a vibrator through a thousand-meter-deep tunnel into the ground and even basing it on basalt to receive weak signals of precursors to predict earthquakes has encountered a series of technical problems. One of the keys is the design, material selection, processing and heat treatment of the pre-stressed leaf spring of the pickup. Since March 1976, Tianjin University and Tianjin Earthquake Engineering Institute conducted a series of experimental research on this issue. In response to the special requirements put forward by the spring-loaded operation of the pickup in deep wells, they selected five materials for deformation-strengthened alloy 3J23, martensitic-effective steel 18Ni-300, constant-elasticity alloy 3J58, 3J53, and elastic alloy 3J3 Form of spring, performance testing, processing and heat treatment to determine the process and the final actual downhole test. Which 3J58 focus on the study and determine the structure of the spring size and the more appropriate heat treatment process. Namely, the round leaf spring is adopted, the solution treatment is performed at 1050 ° C. and 15 minutes, the cold deformation rate is 60%, the wire is cut and shaped, and the aging is performed at 700 ° C., 2.5 hours and 650 ° C. for 2.5 hours, After hand-shaping 350 ℃, 2.5 hours stress homogenization and 100 ℃, 30 hours to relaxation treatment. After the spring selected by the above-mentioned treatment, the working parameters of the spring are calibrated to be installed and the downhole test is carried out. In November 1976, the shock picker carried out seismometric tests at a depth of 902 meters and worked for a period of time, and the effect was better.