abstract: with the rapid development of processing industry, speeding the production has already become the first goal in the competition of enterpr**es. however, in the process of manufacturing products, it takes a relatively long time to perform maintenance. the failure rate of pendulum shearing machines in the fin**hing zone at the bar mill of bayi steel grows cons**tently along with the increase of service time, in particular, copper bolts on the stud of the pendulum shearing machine often break, seriously inhibiting the production progress and maintenance efficiency. therefore, finding out reasons why copper bolts break and methods to **oid such a failure may improve the maintenance in the pendulum shearing zone. the article describes reasons why the bolts break and corresponding solutions.keywords: pendulum shearing, bolt, break, renovation 20210311
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