CN1358586A - Method for making printed angle rectangle section steel pipe - Google Patents

Abstract

The method for manufacturing rectangular pipe with sharp corner is characterized by that it uses rolling central line as a diagonal line of formed pipe to make multiple-pass cold-bending symmetrical deformation so that two side ends of steel strip which are made into oblique end face are finally closed on the rolling central line so as to form included angle with 90 deg. of said rectangular pipe. Said method is easy to regulate and operate, small in formed error, weld seam and two side are in symmetrical state, so that its welding effect is good, and its energy consumption also can be reduced.

Description

A kind of method of making printed angle rectangle section steel pipe

Technical field

The present invention relates to the method for clod wash processing and manufacturing rectangular steel pipe, particularly a kind of manufacturing has the method for the rectangular steel pipe of wedge angle.

Background technology

The top side rail of Chinese Railway shipping open-top car be cross section to have place's angle of bend be the rectangular steel pipe of R≤7, be commonly referred to printed angle rectangle section steel pipe.Adopted the hot-rolled steel channel butt welding to form in the past.Because of there are all quality shortcomings in it, industry standard changes it into and adopts the cold-rolled forming section goods at present.The factory that has now is 93104319.0 by China Patent No., and " a kind of method of making square pipe with sharp corners " produces this product.But there is following shortcoming in this method: the one, and this method adopts eccentric cold roll forming, the distortion moment unbalance, the band steel is in metastable condition all the time, distortion moment is big, cause the adjustment operating difficulties, and the distortion accumulated error is bigger, and final molding geometric accuracy assurance property is poor, and, need very big power to finish in finishing, aligning process, energy loss is big; The 2nd, because the interface of shaping steel tube is on the parallel medial surface that is connected to another side of end face on one side, be the plumbness that interface is the T font, its weld seam and both sides are asymmetric state, and induced-current is skewness on whole welding line, therefore, the welding power consumption is big, welding quality is not good enough.

Summary of the invention

The objective of the invention is for overcoming the shortcoming that said method exists effectively, a kind of more advanced method of reasonably making printed angle rectangle section steel pipe is provided, this method manufacturability is reasonable, stable, is convenient to operation, and constant product quality and energy resource consumption are little.

The method of the present invention's the angular rectangular steel pipe of manufacturing, be by band steel several time of process cold roll forming on cold-rolled forming section rolling unit, its interface is through welded closed, again through finishing, aligning and finish, it is characterized in that: carry out symmetric deformation with rolling centerline as a diagonal of shaping steel tube, processing is the final closed 90 ° of wedge angles that form rectangular tube on rolling centerline of band steel two side ends of angled end-face.

The inventive method is owing to adopt with rolling centerline and carry out symmetric deformation as a diagonal of moulding pipe, and the band steel is in the balance and stability state all the time in the operation of rolling, therefore adjust operation easily, and forming errors is little; The band steel two side ends closure that processing is angled end-face is on rolling centerline, and its weld seam and both sides are symmetry status, both can adopt induction welding, also can adopt the contact welding, and the current density that is distributed on the whole piece weld seam is even, thereby can cut down the consumption of energy greatly.

Description of drawings

Fig. 1 is the cross-sectional view of the rectangular steel pipe with a wedge angle of the inventive method manufacturing.

Fig. 2 is the clod wash deformation process schematic diagram that the inventive method is made rectangular steel pipe shown in Figure 1.

Fig. 3 is that the inventive method will be sheared the roll arrangement schematic diagram that is angled end-face with the steel two side ends simultaneously in the distortion of second passage.

The specific embodiment

The embodiment that provides below in conjunction with accompanying drawing describes in further detail the inventive method.

The technical process of making printed angle rectangle section steel pipe as shown in Figure 1 is as follows:

A, determine the concrete size of required strip width and each limit according to the cross section geometry of rectangular tube.

B, as shown in Figure 2 determines the site position on rectangle tube edge (2) and limit (3) to adjust each passage roll location its roll center line (being rolling centerline (0-0)) is overlapped with the node of limit (2), limit (3).

C, carry out eight passage symmetric deformations with rolling centerline (0-0) as a diagonal of moulding pipe, its distortion principle is for deciding arc length respective change angle of bend and bending radius.Promptly follow L=R α principle, L is the flexural center arc length in the formula, and R is a bending radius, and α is an angle of bend.Deformation process is as shown in the table:

Rolling pass	The angle on limit (1) and limit (2)	The angle on limit (2) and limit (3)	The angle on limit (3) and limit (4)	The angle on limit (4) and limit (1)
					????F1	????159°	????172°	????159°
????F2	????145°	????164°	????145°
					????F3	????120°	????156°	????120°
????F4	????108°	????148°	????108°
					????F5	????108°	????116°	????108°
????F6	????108°	????94°	????108°
					????F7	????100°	????94°	????99.5°
????F8	????95.3°	????91°	????95.5°
					Extrusion molding	????90°	????90°	????90°	????90°

During to extrusion molding, limit (1) is closed on rolling centerline (0-0) with limit (4), forms 90 ° of wedge angles of rectangular steel pipe.In second passage (F2) is rolling, will be cut into respectively with the steel two side ends simultaneously and be 42 °-45 ° angled end-face with the plate face.

The limit (1) of the rectangular tube behind d, the clod wash extrusion molding and the closure place of limit (4) are through HFI welding or contact welding, are finished product behind finishing, the aligning.

With reference to Fig. 3, the shearing inclined-plane (A) of above-mentioned realization band steel two side ends is to install roll blade (5) on the second passage milling train additional, makes it in band steel (B) clod wash distortion, roll blade (5) rotation under band steel (B) pulling will be with the steel two side ends to cut into the inclined-plane (A) of predetermined angular.(6) be that side roll shaft, (7) are bottom roll for topping roll, (8).

Present embodiment adopts eight passage symmetric deformations, is not the unique qualification to the inventive method, according to technical conditions such as the concrete specification of required manufacturing moulding pipe and materials, can do the increase and decrease on the passage fully; Shearing processing to band steel two side ends also can be carried out on other passage, also can adopt the cutter of drive to carry out machining.

Claims (4)

1. method of making printed angle rectangle section steel pipe, be by band steel several time of process cold roll forming on cold-rolled forming section rolling unit, its interface is through welded closed, again through finishing, aligning and finish, it is characterized in that: carry out symmetric deformation with rolling centerline (0-0) as a diagonal of moulding pipe, be processed into the final closed 90 ° of wedge angles that form rectangular tube of going up in rolling centerline (0-0) of band steel two side ends of angled end-face.

2. a kind of method of making printed angle rectangle section steel pipe according to claim 1 is characterized in that described band steel two side ends is cut into respectively and is 42 °-45 ° angled end-face with the plate face.

3. a kind of method of making printed angle rectangle section steel pipe according to claim 1, it is characterized in that finishing through eight passages with the symmetric deformation of rolling centerline, when the 8th passage is out of shape, limit (1) is 95.3 ° with the angle on limit (2), limit (2) is 91 ° with the angle on limit (3), limit (3) is 95.5 ° with the angle on limit (4), and during to extrusion molding, limit (1) is 90 ° with limit (4), limit (4) with the angle on limit (1) with limit (3), limit (3) with (2), limit (2).

4. a kind of method of making printed angle rectangle section steel pipe according to claim 1 and 2, the angled end-face that it is characterized in that described band steel two side ends are to shear simultaneously in the clod wash of second passage distortion and obtain.

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