Tunneling machine heavy-load hobbing cutter ring

Abstract

The invention provides a tunneling machine heavy-load hobbing cutter ring. A medium frequency induction heating device is adopted to carry out annealing treatment; firstly, an inductor suitable for the size of the cutter ring is manufactured and stretches into the cutter ring with the inner wall interval ranging from 5mm to 8mm, and a cutter ring annealing bracket and a lifting table are manufactured; secondly, a laser thermodetector is adopted for measuring temperature at fixed points, the heating temperature is 700 DEG C and is preserved form 10min, and current heating is carried out step by step from 50 to 100A; then heat preservation is adopted for slowly cooling, and then 2 hours of de-stress tempering is carried out; and finally, the treated cutter ring is constant in blade hardness, the abrasion resistance is not influenced, and the cutter ring hardness is transited step by step from the inner diameter to the blade part of the cutter ring within the range from 45 to 60HRC. According to the tunneling machine heavy-load hobbing cutter ring provided by the invention, the cutter ring is manufactured through hypereutectoid steel with high strength and ductility, the diameter of the cutter ring is increased, a space in a cutter hub is correspondingly expanded, and a heavy-load bearing can be selected to meet the requirement on a carrying capacity; and meanwhile, after annealing treatment, the cutter ring hardness is transited step by step, the cutter ring blade part has wear resistance, the cutter ring inner diameter has toughness, and flaking damage is avoided. The tunneling machine heavy-load hobbing cutter ring is suitable to be applied as the hobbing cutter ring.

Description

technical field [0001] The invention relates to a tunnel boring machine hob, in particular to a cutter ring of the tunnel boring machine hob. Background technique [0002] Insufficient hob bearing capacity in tunnel boring machine construction is the main problem of failure. When the thrust of the roadheader is too large, the wear between the hob cutter ring and the rock will increase, and the top force and transverse shear stress on the blade will easily cause the edge to jump. Currently, 17-inch and 19-inch hobs are commonly used in China. When the thrust is too large during excavation, the hob bearing load will increase, and a large amount of heat will be generated during work, which will deteriorate the bearing environment, cause rolling body damage, oil leakage, etc. In order to increase the driving efficiency, a large load bearing should be selected. Large-diameter hobs are also the development direction of large-section hard rock TBMs. [0003] However, if the bear...

AI Technical Summary

Problems solved by technology

The cutter ring is made of high-strength and toughness hypereutectoid steel, the diameter of the cutter ring is increased, the space in the cutter hub is reasonably used to select heavy-duty bearings, and the hardness of the cutter ring after annealing is gradually transitioned, reducing the hob cutter ring. Cracking probability; solve the technical problems of tunnel boring machine hob bearing insufficient thrust and low efficiency

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