Engine crankshaft nitriding quality inspection method

Abstract

An engine crankshaft nitriding quality inspection method includes the following steps that: according to the shape of a crankshaft to be inspected, a crankshaft with the same structure and shape is first produced to serve as a standard crankshaft sample piece dedicated to sampling for inspection, a plurality of square through holes which run through the main journals of the standard crankshaft sample piece are arranged on the main journals, a material which is the same as a crankshaft material is then made into a standard sample block matched with the square through holes, the standard sample block is pressed into the square through holes, the standard crankshaft sample piece and crankshafts to be nitrided are then nitrided in the same furnace, the standard sample block is taken out from a sample-extracting mechanism after nitriding is finished, and the nitrided layer depth, nitriding hardness and nitrided texture of the standard sample block are inspected in order to determine whether the whole batch of crankshafts meets requirement. The method directly analyzes sample block inspection, and prevents the waste of cost which is caused by the destructive inspection of each batch of products.

Description

technical field [0001] The invention relates to a detection method, in particular to the detection of the nitriding treatment quality of an engine crankshaft, and belongs to the technical field of internal combustion engines. Background technique [0002] During the operation of the internal combustion engine, the crankshaft is subjected to the combined action of the centrifugal force of the rotating mass, the periodically changing gas pressure, the reciprocating inertial force and its moment, and the alternating stress is generated inside and the fatigue damages; the crankshaft rotates at a high speed in a harsh working environment, and the journal Also subject to severe wear and tear. In order to improve the anti-fatigue and anti-wear strength of the crankshaft journal, different types of surface treatment should be carried out on the crankshaft journal according to the different materials of the crankshaft. [0003] Nitriding, as an effective treatment method widely used...

AI Technical Summary

Problems solved by technology

After the crankshaft ion nitriding, it is required to take a sample from each furnace, cut a part of the sample block from the main journal of the sample, and test and analyze the depth of the nitrided layer, the hardness of the nitrided layer, and the structure of the nitrided layer, so that the entire crankshaft Samples are scrapped, resulting in a serious waste of resources

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