Preparation method of fracture-resistant steel rope bolt
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A steel cable bolt and anti-fracture technology, applied in the field of preparation of anti-fracture cable bolts, can solve the problems of fracture or crack, formation of accident sources, easy rust and corrosion, etc., achieve good plasticity, improve tensile strength, and bolt accuracy. high effect
Inactive Publication Date: 2013-06-05
繁昌县琪鑫铸造有限公司
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In addition, when the bolts are in a relatively humid environment, they are prone to rust and corrosion, eventually leading to breakage or cracks, forming a potential source of accidents
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[0021] The present invention will be further described in conjunction with the following examples:
[0022] The preparation method of the anti-fracture steel cable bolt, the processing steps include:
[0023] a. Casting rod material, the weight percentage of the chemical composition in the rod material blank is: 0.132%≤C≤0.260%, 0.62%≤Si≤1.30%, 0.25%≤Mn≤0.35%, 0.010%≤P≤0.030%, 0.010% ≤S≤0.030%, 1.10%≤Cr≤1.50%, trace ≤B≤0.0018%, 0.012%≤Cu≤0.030%, the balance is iron and unavoidable impurities;
[0024] b. The rod material after casting is pickled; according to the wire diameter requirements of the bolt, it is drawn to make the rod material shrink to the wire diameter required by the bolt; the rod material after shrinking the wire diameter Cut to the length required by the bolt, put the cut rod material into the mold cavity covered with plant ash at room temperature, and use the upsetting force to form the rod material into the head and rod size required by the bolt; use a prec...
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Abstract
The invention discloses a preparation method of a fracture-resistant steel rope bolt. The process includes following steps: a. casting rod material, wherein a blank of the rod material comprises, in terms of chemical component, by weight, 0.132%-0.260% of C, 0.62%-1.30% of Si, 0.25%-0.35% of Mn, 0.010%-0.030% of P, 0.010%-0.030% of S, 1.10%-1.50% of Cr, trace quantity-0.0018% of B, 0.012%-0.030% of Cu, and the balances are Fe and inevitable impurities; b. washing the rod material after casting molding in acid, conducting thread drawing for the rod material according to the requirement of thread diameter of the bolt to enable the rod material to shrink to the required thread diameter, cutting the rod material after thread diameter shrinks to the required length of the bolt, placing the cutting-off rod material into a mould shaped cavity which is covered by plant ashes at normal temperature, enabling the rod material to form a required head part and required size of a rod part of the bolt by applying upset forging force, and making screw threads on the periphery face of the rod part of the rod material through turning by using a precision lathe. According to the preparation method of the fracture-resistant steel rope bolt, cold extrusion process is applied to process the bolt, so that the strength of the bolt is improved, required hardness and strength of a high-strength bolt are reached, and the problem that delayed fracture and fatigue fracture of the bolt under high strength is solved. The bolt is reliable to use in connection, not easy to break, and the service life of the bolt is prolonged.
Description
technical field [0001] The invention relates to a bolt processing method, in particular to a preparation method of a fracture-resistant steel cable bolt. Background technique [0002] Cable bolts are commonly used fasteners in the machinery industry. The current processing method is generally turning and forming, and the strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turn and rod breakage occur during use, which is very harmful to industrial production. Therefore, it plays an important role in the development of technology and economy to study and improve the production method of high-strength bolts to ensure the quality stability of high-strength bolts. In addition, when the bolts are in a relatively humid environment, they are prone to rust and corrosion, eventually leading to breakage or cracks, forming a potential source of accidents. [0003] In view of this, it is necessary to provide a method for preparing steel cable bolts to produce ...
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