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环形导轨是 WK-4型挖掘机中的关键件,也是主要的易损件之一。在矿山使用中,环轨磨损快,表层剥皮和压堆现象较严重,在更换时很困难。我厂过去采用火焰淬火,是在环轨焊到平台后进行的,环轨淬火后不能回火,淬火应力很大,且淬硬层薄(只1.5～2.0毫米),硬度不均,表面发脆,影响了环轨的使用寿命。我厂现已改用中频淬火,经过几年的反复试验,环轨淬火变形量控制在0.6毫米内,淬
The ring guide is the key piece in the WK-4 excavator and one of the major wearing parts. In mine use, the ring rail wear fast, surface peeling and piling phenomenon is more serious, difficult to replace. I used to flame the plant in the past, is the ring rail welding to the platform after the ring can not be quenched after tempering, quenching a large stress, and hardened layer thin (only 1.5 to 2.0 mm), uneven hardness, the surface hair Brittle, affecting the service life of the ring track. I have now switched to intermediate frequency quenching plant, after several years of repeated tests, the ring quenching deformation control within 0.6 mm, quenching