Preparation method of high-strength excavator bolts

An excavator, high-strength technology, applied in the field of preparation of high-strength excavator bolts, can solve the problems of easy rust and corrosion, breakage or cracks, and the formation of accident sources, and achieve high precision bolts, good plasticity, and improved tensile strength The effect of intensity

Active Publication Date: 2016-03-02
浙江艾信汽车零部件股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] The present invention will be further described in conjunction with the following examples:

[0022] A method for preparing a bolt for a high-strength excavator. The processing steps include:

[0023] a. Casting rod blank, the weight percentage of chemical composition in the rod blank is: 0.234%C, 0.64%Si, 0.30%Mn, 0.024%P, 0.026%S, 1.4%Cr, 0.001%B, 0.022%Cu, and The amount is iron and unavoidable impurities; the temperature of the casting blank is reduced to 250°C, then heated to 670-780°C, kept for 3-5 hours, cooled to 300°C, kept for 3 hours, and then heated to 650-760°C , keep warm for 10 hours, cool to 400°C at 45°C / hour, then cool to room temperature at 25°C / hour;

[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 r...

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PUM

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Abstract

The invention discloses a method for manufacturing bolts for a high-strength excavator. The manufacturing process includes rod material blank casting, wherein the rod material blank comprises the follow chemical components by weight: 0.221%<=C<=0.262%, 0.32%<=Si<=0.90%, 0.25%<=Mn<=0.35%, 0.013%<=P<=0.030%, 0.023%<=S<=0.030%, 20%<=Cr<=1.50%, trace<=B<=0.0018%, 0.012%<=Cu<=0.030%, and the allowance of iron and inevitable impurities. By means of the method, the bolts are processed through a cold extrusion process, so that the strength of the bolts are improved, the required hardness value and strength value of the high-strength bolts can be achieved, delayed fracture and fatigue fracture of the bolts under high strength can be avoided, the bolts can be connected reliably and are not apt to be broken during usage, the service life of the bolts are prolonged, and the using requirements on the high-strength bolts in all industries of the society can be met.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a preparation method of a high-strength excavator bolt. Background technique [0002] Excavator 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 bolts for excavators to produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
Inventor 赵光明
Owner 浙江艾信汽车零部件股份有限公司
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