Phi13 spring round steel hot upset forging crack control method

Abstract

The invention discloses a Phi13 spring round steel hot upset forging crack control method. The method comprises the following steps that firstly, the even number of various specifications of hole patterns with the red bar size larger than a hole pattern base circle are verified again to be subjected to process replacement, and two side walls of round steel entering the hole patterns are planes; secondly, an original mill water nozzle type cooling water pipe is changed into a hydroxide radical spraying type cooling water pipe, the spraying area is increased, the large-area fracturing phenomenongenerated by uneven groove cooling is avoided, the cooling water pipe comprises an arc pipe body, and two spraying nozzles are formed in the outer side pipe wall of the arc pipe body in the radial direction of the pipe body in a spaced manner; and thirdly, a rolling guard guide wheel is improved, the arc face size of the outer circumference of the guide wheel is completely matched with arc sizesof the uneven number of oval rolling parts passing through the guide wheel, and pressing marks generated on two side edges of the oval rolling parts due to un-matched size can be removed. Through improvement of the control method, the machining stress state can be improved, and the round steel surface crack problem can be solved.

Description

technical field [0001] The invention relates to a method for controlling cracks in hot upset forging of Φ13 spring round steel. Background technique [0002] Φ13 spring round steel is special railway equipment for high-speed rail, and the profit per ton of steel has been maintained at 1,000 yuan / t for a long time. However, hot upsetting cracks have always been a bottleneck that cannot be overcome. Φ13 spring round steel is used as the base material for fixing railway rail butterfly fasteners. This defect has a fatal defect that will seriously threaten the safety of high-speed rail. After research, hot upsetting of Φ13 spring round steel The crack problems are as follows: 1. In the hot upset forging cracked samples, fold defects account for a considerable proportion, which is an important factor affecting the quality of round steel hot upset forging. Folding occurs mostly due to the phenomenon of overfilling (ears) in a certain rolling pass, and folds are formed during re-ro...

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Problems solved by technology

[0003] The object of the present invention is to provide a method for controlling cracks in hot upset forging of Φ13 spring round steel, which can improve the processing stress state and solve the problem of cracks on the surface of round steel

[0005] Through the improvement of the control method of the present invention, the processing stress state can be improved, and the problem of cracks on the surface of round steel can be solved

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