CN1045910C - Drawing method for metal conic tube of integrated road lamp pole - Google Patents

Abstract

The present invention provides a drawing method for a metal conic pipe for an integrated road lamp pole and relates to the field of metal rolling. The present invention is characterized in that the drawing method can be adopted to make the metal conic pipe for the integrated (namely with no axial abutting circumferential weld) road lamp pole according to the shape, the specification, etc. of products. The method has the advantages of smooth and clean surface, high structure performance, long service life, simple mold manufacture, etc.

Description

Drawing method for metal conic tube of integrated road lamp pole

The present invention relates to the stress metal manufacture field, be specially adapted to the manufacturing of monolithic devices conical metal pipe.

At present, the widely used light poles of occasion such as urban road, highway, bridge, open deck armored concrete cast conical rod, cast iron or cast steel conical tube are arranged and roll with the steel plate segmentation or flanging after weld the conical pipe that is spliced again, the shortcoming of preceding several prods is Heavy Weight, appearance poor, installation inconvenience, the shortcoming of last a kind of product is that bulk strength is not high, appearance poor, in use, as weld defect, the local self fracture causes traffic accident (the existing precedent of fracture voluntarily) easily.

The technological process of production of circle male-tapered pipe is as follows:

Roll bending pressing → cut-out → cutting (trapezoidal shape) → punch forming (taper) → shaping → welding → correction weld seam → alignment → (other machined) 1500T

Whole piece production line investment is very big, and scale needs more than 4,000 ten thousand, and the capital construction cycle is long, and device therefor is special equipment, and the present invention can adopt steel tube factory's common apparatus to make, and does not need other equipment investment.

The objective of the invention is to be to design the method that adopts draw and make the conical light pole of monoblock type (promptly not having radially welding ring weld seam) metal (steel, aluminium alloy etc.) pipe.

Adopt following process route through our factory's test of many times:

Preliminary treatment before pipe blank → tup and the conventional draw → segmentation reducing → draw shaping → alignment crop scale → check packing is dispatched from the factory

Processing technology of the present invention and process:

1, pipe blank check

Chemical analysis, size, appearance, check need be carried out weld strength test and naked eyes as being welded pipe

The check weld defect must not have weld defects such as cracking, undercut dislocation, slag inclusion to exist;

2, tup and preliminary treatment

At first with circular pipe blank tup (accompanying drawing 2 illustrates the situation behind the blank tup), then according to different materials

The state of reaching carries out the preceding conventional preliminary treatment of different draws, in order to carrying out drawing production;

3, apply lubricant

In carrying out process of tube plug drawing mill, look different materials and state, apply lubricant, to alleviate draw power and to take off

Mould power improves surface quality;

4, segmentation reducing

Pipe (1) forms the stairstepping pipe through multiple tracks external mold (2) draw from big to small; 5, draw is shaped

By the external mold (3) that the pass (4) that matches with conical tube finished product profile is arranged pipe (1) is carried out drawing forming, with pipe (1) depanning that falls back, promptly obtain conical pipe, want accurately each mould location during operation, the conical pipe smooth in appearance that goes out of draw connects like this, no any vestige that connects mould, the draw mode can be cold-drawn or temperature is pulled out; 6, aligning

Gag straightener by hydraulic pressure or common mechanical transmission is aligned, and cushion block is made with wooden or nylon, in case damage; 7, cut off scale, check is dispatched from the factory

The section otch needs and axis normal during cut-out.Characteristics of the present invention:

1, the whole manufacturing do not have radially welding ring weld seam, no local self fracture possibility, and security is good;

2, through draw, grain refinement, intensity increases substantially, and whole weight reduction can be saved materials,

Easy for installation;

3, circularity is good, and appearance is bright and clean, attractive in appearance;

4, through the multiple tracks pressure processing, former blank pipe straight weld structure property is improved, the welding stress corrosion tendency

Little, the life-span is long;

5, can adopt steel tube factory's common apparatus to make, not need other additional investment;

6, the mould manufacturing is simple, and technology is workable;

7, the invention will be further described below in conjunction with drawings and Examples can to make overlength conical tube (length can reach tens meters as required):

Fig. 1 is the pipe schematic diagram among the present invention.

Fig. 2 for the pipe tup among the present invention after schematic diagram.

Fig. 3 is the external mold schematic diagram of segmentation reducing among the present invention.

Among the figure: 2 is external mold;

Fig. 4 for the segmentation reducing among the present invention after schematic diagram.

The schematic diagram that Fig. 5 is shaped for draw among the present invention.

Among the figure: 1 is pipe, and 3 is external mold, and 4 is pass, and 5 is jaw.

A kind of conical pipe manufacturing process flow: (unit: mm) trimmed size φ 180 * φ 100 * 8000 * 4 (φ 1 * φ 2 * L * t) raw material A 3 or other Fine Steel Casting iron raw material specification φ 185 * 7000 * 4

(external diameter * length * wall thickness)

The technological process table

Sequence number	External diameter	Take the lead	Annealing	Pickling	Phosphatization	Saponification	Cold-drawn	Crop	Alignment	Cut off	Remarks
												?0 ?1 ?2 ?3 ?4 ?5	?185 ?165 ?145 ?125 ?105	√	√ √ √	√ √ √	√ √ √	√ √ √	√ √ √ √	√ √	√	√	*1 *2 *3 *4 *5
φ 180 * φ 100 * 8000 * 4 tapered die formings

* 1 afterbody stays 185 section 1600 of φ.* 2 afterbodys stay 165 section 2000 of φ; φ 185 as before.* 3 afterbodys stay 145 section 2000 of φ; φ 185, and φ 165 as before.* 4 afterbodys stay 125 section 2000 of φ; φ 185, and φ 165, and φ 145 as before.* 5 product inspections are dispatched from the factory.

Claims (1)

1, a kind of drawing method for metal conic tube of integrated road lamp pole, it is characterized in that: it comprises the steps:

(1) pipe blank check

Chemical analysis, size, appearance, check need be carried out weld strength test and naked eyes as being welded pipe

The check weld defect must not have cracking, undercut dislocation, dreg defect to exist;

(2) tup and preliminary treatment

At first with the circular pipe blank tup, carry out conventional pre-place before the different draws according to different materials and state then

Reason is in order to carrying out drawing production;

(3) apply lubricant

In carrying out process of tube plug drawing mill, look different materials and state, apply lubricant, to alleviate draw power and to take off

Mould power improves surface quality;

(4) segmentation reducing

Make pipe (1) external diameter segmentation reducing by multiple tracks external mold (2) draw from big to small, form

The stairstepping pipe;

(5) draw is shaped

Be shaped by external mold (3) draw that the pass (4) that matches with finished product conical pipe profile is arranged;

(6) aligning

Gag straightener by hydraulic pressure or common mechanical transmission is aligned, and cushion block is made with wooden or nylon,

In case damage;

(7) cut off scale, check is dispatched from the factory

The section otch needs in axis normal during cut-out.

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