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A sizing and axle technology is applied in the field of trailer axle sizing devices, which can solve the problems of low dimensional accuracy of square tubes and achieve the effect of being easy to implement.
Active Publication Date: 2020-07-14
HENGYANG VALIN STEEL TUBE
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[0005] The main purpose of the present invention is to provide a trailer axle squaring device, trailer axle and its preparation method to solve the problem of low dimensional accuracy of the square tube formed by three-roller sizing in the prior art
Method used
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preparation example Construction
[0027] In another typical embodiment of the present application, a method for preparing a trailer axle is provided. The preparation method includes: heat-treating a steel slab to obtain a hot slab; performing hot piercing and rolling on the hot slab in sequence to obtain a slab tube; square the empty tube to obtain a square tube, and use any one of the above-mentioned trailer axle squaring devices to determine the square for the empty tube.
[0028]Compared with cold-deformed square tubes, hot-rolled square tubes have the advantages of larger cross-sectional area, smaller inner and outer rounded corners, and reasonable distribution of geometric dimensions of the same variety and specification, and have better bearing capacity; Small stress, better low-temperature impact performance, and lower ductile-brittle transition temperature. The square tube produced by cold deformation has a greater possibility of brittle cracking due to the limitation of the process. It is necessary to...
Embodiment 1
[0040] The weight percentage of each chemical element in the square tube material for trailer axle used in low temperature environment is: C 0.19~0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb 0.030~0.050, Al 0.020~0.040, Ni 0.18~0.28, the balance is Fe and unavoidable impurities.
[0041] Taking the production of a square tube with a size of 150×150×11mm as an example, the specific steps are as follows:
[0042] A. Produced by Ф250mm billet. Billet heating is divided into preheating, heating and soaking process. The preheating temperature depends on the furnace temperature; the heating is divided into five stages: the heating stage temperature is 900°C±10°C, the heating stage temperature is 1030°C±10°C, the heating stage temperature is 1150°C±10°C, and the fourth and fifth stage temperatures are 1260°C ±10°C; soaking section temperature 1250°C±10°C, total heating time 2-2.5 hours.
[0043] B. The rolled tube is pierced by a conical piercer and rolled by a continuous tub...
Embodiment 2
[0050] The difference from Example 1 is that the weight percentages of the chemical elements in the square tube material for trailer axles are: C 0.19-0.23, Si 0.20-0.37, Mn 1.55-1.68, V 0.04-0.07, Nb 0.030-0.050, Al0 .020~0.040, Ni 0.5~0.75, the balance is Fe and unavoidable impurities.
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Abstract
The invention provides a trailer axle fixing device, a trailer axle and a preparation method thereof. The trailer axle fixing device comprises one or more round tube rolling machines and one or more square tube rolling machines that are all arranged in sequence along the tube conveying direction, wherein each square tube rolling machine include a frame and three sets of roll portions; each set ofroll portions has an active moving roll; each active moving roll is arranged on the frame; three rolls of the three sets of roll portions include a first roll, a second roll, and a third roll; the axes of all the rolls intersect in the same plane; roll grooves of the rolls are combined to form a square hole; the axes of the first rolls are arranged in a horizontal direction; the axes of the rollsintersect to form equilateral triangles; the roll groove of the first roll constitutes two adjacent side walls of the square hole; and the roll groove of the second roll and the roll groove of the third roll constitute the other two side walls of the square hole correspondingly. The fixing device can fully meet the requirements of high dimensional accuracy of the square tubes for the axle.
Description
technical field [0001] The invention relates to the technical field of metallurgy, in particular to a trailer axle square fixing device, a trailer axle and a preparation method thereof. Background technique [0002] Trailer axles can be divided into "one-piece axle" and "three-section axle" according to the forming method. The "integrated shaft" is made of round tubes, which are formed through processes such as extrusion closing and square pushing. The "three-section shaft" is made of a square tube (each side wall is not an absolute plane but a curved surface with a large curvature radius) as the raw material, and the two ends are welded and forged with a solid shaft head. Compared with the "one-piece shaft", the "three-section shaft" has greater technical advantages, and the safety factor is higher than that of the "one-piece shaft". The shaft head of the "three-section shaft" is a solidforging, with long bearing capacity and long service life; the structural design of t...
Claims
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Application Information
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