CN1060690C

CN1060690C - Technique for continuously drawing pipe using long rod rolling mould

Info

Publication number: CN1060690C
Application number: CN95109729A
Authority: CN
Inventors: 潘克云
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 1995-08-22
Filing date: 1995-08-22
Publication date: 2001-01-17
Anticipated expiration: 2015-08-22
Also published as: CN1120475A

Abstract

The present invention discloses the process for continuously drawing a circular tube by a mandrel rolling model. A rolling model is a three-roller rolling model, the drawing deformation process can be finished by the method that at least three rollback models are continuously drawn, wherein the device comprises at least one main deformation machine frame, one wall-uniforming machine frame, and one circle-arrangement machine frame, and two adjacent rolling models are across arranged mutually at 60 DEG. When the drawing is carried out, a mandrel is penetrated through the tube, the thinner front end of the mandrel is penetrated through by the necking port of the tube and penetrates through each rolling model, the front end of the mandrel is drawn so as to axially move, and the tube is brought into each three-roller rolling model. Thereby, a series of cold drawing processes such as diameter reduction, wall reduction, wall uniform and circle arrangement are finished, and then the drawing from circle to circle of a single track can be achieved.

Description

Technique for continuously drawing pipe using long rod rolling mould

The present invention relates to a kind of cold-drawn pipe technology, specifically a kind of technique for continuously drawing pipe using long rod rolling mould is used for production and processing non-ferrous metal and ferrous metal pipe material.

Disclose a kind of " technique for continuously drawing pipe using long rod rolling mould " among the Chinese patent CN90103456.8, it adopts long plug and multiple roll to roll mould.During draw, be the active force drawing with long plug axially-movable, roll the passive rotation of mould, long plug and tubing pass simultaneously and roll mould.This technology has that the machining deformation resistance is little, pass deformation is big, energy consumption is low, and surface quality is better than advantages such as fixed die draw.Its weak point is: roll the mould draw and roll mould by two multiple rolls and finish, first is rolled mould and finishes main distortion, second is rolled mould and plays the expansion effect, does not have this technical process of rounding, and the pipe of extracting is a polygon, can not be as production tube, roll mould by one and finish main distortion, distortion is to subtract wall, owing to be subjected to the maximum tube reducing quantitative limitation of single chassis, require the gap between pipe material internal diameter and the diameter of mandrel little, cause and wear the rod difficulty before pulling out.Through first roll mould aximal deformation value draw after, bigger at the wall thickness of roll gap place pipe, needing have certain wall thickness reducing amount to make the pipe wall thickness even in the expansion frame, this makes pipe and plug embrace very tightly, it is difficult to take off rod, and the special excellent equipment that takes off must be arranged.In addition, adopt the above pass frame of four rollers or four rollers, the processing of pass, to adjust difficulty big.

The purpose of this invention is to provide a kind of finished size precision height, wear, depoling rod easily, pass is easy to process the technique for continuously drawing pipe using long rod rolling mould of adjustment, realize single pass by circle to round process of tube plug drawing mill.

The object of the present invention is achieved like this: rolling mould is that three rollers roll mould; the draw deformation process is rolled mould by at least three and is connected to pull out and finish; comprising at least one main distortion frame, an equal wall frame and a rounding frame, face two mutually and roll mould and be mutually 60 ° of arranged crosswise.Its main processes is as follows:

(1) to pipe anneal, reducing and lubricated;

(2) long plug is penetrated pipe, the thinner front end of long plug is passed by the reducing of pipe, and passes each frame three roller and roll mould;

(3) front end of the long plug of drawing axially moves it, pipe is brought into each frame three roller roll mould, finishes tube reducing, subtracts wall, Jun Bi, a series of Cold Drawing Process of rounding;

(4) with plug by extracting out in the pipe.

Fig. 1-Fig. 5 is the deformation process schematic diagram of technique for continuously drawing pipe using long rod rolling mould of the present invention.In the reaction process of tube plug drawing mill, pipe 1, plug 2 and roll relation between mould 3 threes.

The invention will be further described below in conjunction with accompanying drawing.

Technique for continuously drawing pipe using long rod rolling mould of the present invention, it rolls mould 3 and adopts three rollers to roll mould, and the draw deformation process is rolled mould 3 by at least three and is connected to pull out and finish, and preferably rolls mould 3 by 4-6 frame three rollers and finishes.Wherein at least one main distortion frame seen Fig. 2 .3, and its pass that rolls mould 3 is an oval groove; An equal wall frame is seen Fig. 4, and it rolls the pass of the pass of mould 3 for band circular arc sidewall, also can be the pass of band straight sidewall; A rounding frame is seen Fig. 5, and its pass that rolls mould 3 is a circular hole.Facing two mutually rolls mould and is mutually 60 ° of arranged crosswise.

Annealed, reducing and lubricated pipe 1 are delivered on the draw center line, insert long plug 2, the reducing and each frame that make long plug 1 smaller diameter end pass pipe 2 roll mould 3, the front end of the long plug 2 of drawing axially moves it, pipe 1 is brought into each frame roll mould 3, realize that cold company pulls out, its deformation process is shown in Fig. 1-5.Fig. 1 is the relation of pipe 1 and long plug 2 before the draw, owing to first main transformer shape frame based on tube reducing, allowing has certain clearance between the internal diameter of long plug 2 and pipe 1, long plug 2 to wear rod motion easy.Fig. 2. Fig. 3 is the draw distortion situation of pipe in main transformer shape frame, pipe 1 will be finished tube reducing substantially, subtract the wall distortion in main transformer shape frame, through every lengthening coefficient that rolls mould 3 is μ=1.2～1.6 because lengthening coefficient is bigger, pipe 1 and 2 armfuls of plugs very tight.Fig. 4 is the distortion situation of pipe 1 in equal wall frame, and depress in former roll gap position generation after mainly the distortion frame is extended its lengthening coefficient μ=1.1～1.3, even pipe 1 circumferential wall thickness, and in roll gap position generation certain clearance.Fig. 5 is the distortion situation of pipe in the rounding frame, and the very little μ of lengthening coefficient=1.01～1.05 make pipe 1 become circle, produces the gap between pipe 1 and the plug 2 simultaneously, is convenient to take off rod.

Process of tube plug drawing mill finishes, and long plug 2 leaves the draw center line with pipe 1, and long plug 2 is extracted out from pipe 1.

Introduce embodiments of the invention below.

Embodiment 1: technology is rolled the process of tube plug drawing mill that mould is finished by four three rollers according to the present invention.Face two mutually and roll the mould 60 ° of layouts that misplace mutually.First and second rolls mould is main transformer shape frame, and pass is an oval groove.The 3rd is rolled mould is equal wall frame, and pass is the pass of band circular arc sidewall.The 4th is rolled mould is circle cover frame, and pass is a circular hole.Processed pipe is 42 * 5 millimeters pipes of φ, and material is No. 20 boiler tubes.To pipe anneal, reducing, lubricated after the company of delivering to pull out center line.Insert long plug, make the smaller diameter end of long plug pass reducing and each frame rolls mould.The cold-drawn clamp vises the smaller diameter end of long plug, elongates plug and does axially-movable, brings pipe into each frame and rolls mould, finishes cold company and pulls out process.Jaw unclamps, and long plug leaves the draw center line with pipe, extracts long plug out.Finished product pipe after the processing is of a size of 35 * 2 millimeters of φ, and lengthening coefficient is μ=2.8, and wall thickness tolerance is 6%, and ovality is 1%.

Embodiment 2: technology is rolled the process of tube plug drawing mill that mould is finished by five three rollers according to the present invention.Comparing with embodiment 1 has increased a main transformer shape frame, and other technical process is identical.Processed pipe is 42 * 5 millimeters pipes of φ, and material is No. 20 boiler tubes.It is μ=4.8 that finished product pipe after the processing is of a size of 33 * 1.2 millimeters lengthening coefficients of φ, and wall thickness tolerance is 6%, and ovality is 1%.

The advantage that the present invention compared with prior art has is: 1. adopt and roll more than three The mould frame is carried out draw, has finished the mould that rolls truly and has even pulled out, and technical process is complete, Realized by circle to the process of tube plug drawing mill of justifying finished size precision height: 2. First main transformer shape Frame is take tube reducing as main, and allowing has certain interval between pipe and the plug, and circle cover technology Make between the pipe behind the draw and plug and produce the gap, therefore wear off rod easily; 3. hole Type is made of three rollers, is convenient to processing, the adjustment of pass; Roll mould with four rollers and compare, pull out Process pipe stress processed is good, is difficult for producing lobe; 4. because this technology is a company Pull out process, pass deformation is big, and lengthening coefficient can reach 2.0～5.0, has reduced by former and has expected The draw passage of finished product and middle operation, rhythm is fast between giving birth to, economic benefit is high.

Claims

1. a long core rolls the mould technique for continuously drawing pipe using; it is characterized in that: rolling mould is that three rollers roll mould; the draw deformation process is rolled mould by at least three and is connected to pull out and finish; comprising at least one main distortion frame, an equal wall frame and a rounding frame; face two mutually and roll mould and be mutually 60 ° of arranged crosswise, its main processes is as follows:

(1) to pipe anneal, reducing and lubricated;

(4) plug is extracted out from pipe.

2. technology according to claim 1 is characterized in that the mould that rolls of described main distortion frame adopts oval groove; All the wall frame roll the pass that mould can adopt band circular arc sidewall, also can adopt the pass of band straight sidewall; The mould that rolls of rounding frame adopts circular hole.

3. technology according to claim 1 is characterized in that described draw deformation process preferably rolls mould by 4-6 frame three rollers and finish.