Bar V-shaped groove tip microcrack preparing method based on straightening mechanism

Abstract

The invention relates to a bar V-shaped groove tip microcrack preparing method based on the straightening mechanism and belongs to the technical field of metal bar feeding. The method is based on a straightening machine which mainly comprises a driven material pulling mechanism, a driving material pulling mechanism, a straightening and transmission mechanism, a material conveying mechanism and a machine frame. The driven material pulling mechanism, the driving material pulling mechanism, the straightening and transmission mechanism and the material conveying mechanism are arranged on the machine frame. The driven material pulling mechanism and the driving material pulling mechanism are arranged at one end of the straightening and transmission mechanism. The material conveying mechanism is arranged at the other end of the straightening and transmission mechanism. According to the method, by screwing an adjusting bolt, a circulating strain effect can be conveniently used for forming microcrack in the tip end of a metal bar V-shaped groove, the structure is simple, and automatic operation can be achieved conveniently.

Description

technical field [0001] The invention relates to a method for microcracking at the tip of a V-shaped groove of a prefabricated bar based on a straightening mechanism, and belongs to the technical field of metal bar cutting. Background technique [0002] At present, the blanking of metal bars in the manufacturing industry has attracted more and more attention. The so-called blanking refers to the process of separating the bar into blanks of the required size and shape for subsequent processing. In many industries such as machinery manufacturing, the blanking of metal bars is the first process in the processing process. It is widely used in cold extrusion, die forging, metal chain pins, rolling bearing rollers, bolts, nuts, and pins. In the material preparation process of , shafts, etc., and in these blanking processes, the amount of blanking is huge. At present, the traditional blanking methods, such as sawing and turning, have problems such as low material utilization rate, ...

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Problems solved by technology

[0003] In the prior art, the low-stress precision blanking method adopts the turning method to prefabricate the V-shaped groove. Due to the wear and tear of turning and its life, the root fillet radius of the V-shaped groove cannot be too small, so that the stress concentration cannot be too large. As a result, the blanking force is still very large, and the time taken to form an ideal crack after loading the annular V-shaped groove with a large fillet radius occupies more than 80% of the total fatigue blanking time, and the blanking efficiency is low

This is because when blanking, if the initial external force is large, the bar will break instantly and the cross-section quality will be poor; if the initial external force is small, it will be difficult or not to produce cracks at the tip of the V-groove of the bar, resulting in very short blanking time. Long, difficult to control the initial external force

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