CN1047229A

CN1047229A - Technology for drawing-rolling circular pipe with long-mandrel rool die

Info

Publication number: CN1047229A
Application number: CN 90103456
Authority: CN
Inventors: 李连诗
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 1990-07-11
Filing date: 1990-07-11
Publication date: 1990-11-28
Anticipated expiration: 2005-07-11
Also published as: CN1019877C

Abstract

Name of the present invention is called long plug multiple roll rolls mould and pulls out and roll pipe technology, is used to produce cold (temperature) and is processed with non-ferrous metal and ferrous metal pipe material.The present invention replaces fixed die to roll mould, with long plug axially-movable as active force drawing pipe material, driving long plug expects to pass simultaneously to roll mould with pipe, make and roll the passive rotation of mould, and pipe material is rolled, roll while pulling out, pull out to roll and subtract the wall extensional, become conventional draw method and pull out into single roller transmission and roll combined techniques in conjunction with what finish pipe material.It is big that the present invention and existing cold-rolling process are compared pass deformation, and middle operation is few, and rhythm of production is fast, and device structure is simple, reduced investment, and energy consumption and various consumption are low, the lumber recovery height.

Description

Technology for drawing-rolling circular pipe with long-mandrel rool die

The present invention relates to a kind of technology of producing metal circular tube, be used to produce cold (temperature) and be processed with non-ferrous metal and ferrous metal pipe material.

Conventional both at home and abroad method of producing cold (temperature) processing tubing has: fixed die long and short plug draw method and periodic cold-rolling mill rolling.The deadly defect of fixed die draw method is to exist very big mould between metal and the mould to wipe resistance when flow of metal, thereby cause pass deformation little, tube surfaces is easily big by plucking, draw power, energy consumption big, the mould consumption is big, and tup length length causes disadvantages such as lumber recovery is low.The shortcoming of periodic rolling is that production efficiency is low, energy consumption is big and equipment is complicated, the investment big, and plug is the resistance plug.

Disclose the continuous drawbench of a kind of long plug among the Russian Patent SU1002065, it has long plug and a fixed die.During draw, plug is subjected to axially moving from the thrust of afterbody, drives workpiece and plug and passes through mould together.Because it is continuous draw, its objective is by adopting two chains and draw axial symmetry and having the load transporter of braking shelves, improve the reliability of drawing process.Its weak point is: use fixed die draw resistance big, cause the energy consumption height, product surface quality is not good enough and take off the rod difficulty, and the mould consumption is big.

The objective of the invention is to avoid above-mentioned weak point of the prior art, a kind of technology of drawing-rolling circular pipe with long-mandrel rool die is provided.Make and pull out roll process and combine, to enhance productivity, reduce equipment investment, it is little to obtain a kind of machining deformation resistance, and energy consumption is low, and pass deformation is big, and metal wastage is little, the method for the production that surface quality is good cold (temperature) processing tubing.

Purpose of the present invention can reach by following measure: replace fixed die with rolling mould, with long plug axially-movable as the active force drawing, long plug and tubing pass simultaneously and roll mould, make the passive rotation of the roller that rolls mould by the frictional force of managing material and roll between the mould, and pipe material is rolled, roll while pulling out, pull out to roll and subtract the wall extensional in conjunction with what finish pipe material.Becoming conventional draw method pulls out into single roller transmission and rolls combined techniques.

Below in conjunction with accompanying drawing the present invention is described in detail:

Fig. 1 is the technology for drawing-rolling circular pipe with long-mandrel rool die schematic diagram, and 1 is that long plug, 2 is for managing material, 3 and 4 for rolling mould among the figure;

Fig. 2 rolls die device for long plug four rollers;

Fig. 3 is that four rollers roll nib type figure.

Long plug 1 is made up of the pole of two sections coaxial reducings, and its smaller diameter end is the front end of plug.Mandrel drawing needs to expect an end reducing of 2 pulling out will manage earlier before rolling that reducing matches with the smaller diameter end of long plug.Then long plug is inserted in the pipe material, the front end of long plug passes the necking end of pipe material and passes and roll mould 3,4.Draw the plug front end that it is axially moved, and will manage material and long plug is brought into together and rolled mould.Because the reducing of pipe material is to be that front end matches with the smaller diameter end of long plug, so pipe expects to enter the deformed area together with plug when elongating the plug front end.

Rolling mould rolls mould to pipe material rolling by two multiple rolls and finishes.Every is rolled mould N roller is arranged, and two of front and back dislocation (180 °)/(N) are mutually arranged.First is rolled mould and finishes main distortion, and second is rolled mould and play the expansion effect.Help rolling back plug and the bigger gap of pipe way generation like this, be easy to take off rod.Every N roller that rolls mould constitutes a pass such as a Fig. 3 who is with the circular arc angle of sides.Do axially-movable and drive pipe material and long plug together when rolling mould when elongating plug, the pipe material makes two passive rotations of roller of rolling mould expect to be rolled to managing with the drawing rub power of rolling between the mould.

Introduce one embodiment of the present of invention below:

Figure 2 shows that long plug four rollers according to the designed manufacturing of this technology roll die device, every is rolled mould four rollers is arranged, two the 45 ° of layouts that misplace mutually in front and back, roll mould roller pass as shown in Figure 3, two sections coaxial its diameters of reducing pole of long plug are respectively 20 millimeters and 15 millimeters, the transition of middle employing circular cone post, this device is installed on the drawbench.The processed pipe material is 25 * 2 millimeters pipes of φ, and material is No. 20 steel, with an end reducing of pipe material, inserts long plug then, makes long plug smaller diameter end pass reducing and roll mould.Pull out that the drawbench jaw vises long plug smaller diameter end when rolling, do rectilinear motion by main motor by the dolly that sprocket wheel drives chain and band jaw, draw in and roll mould before making long plug axially-movable will manage material and long plug one, roll the passive rotation of roller of mould, finish the process of rolling of pulling out.Finished product pipe after the processing is of a size of 23 * 0.8 millimeters of φ, and wall cut rate reaches 60%, and lengthening coefficient is 2.59, and wall thickness differs from 0.05 millimeter, and external diameter differs from 0.2 millimeter, and surface quality is better than the pipe of prior art institute production and processing.

The present invention compared with prior art has following advantage:

1. of the present invention pulling out rolled combined process, created stress state favourable in the deformation process, deformation state and kinematics condition, and the limit is pulled out to become and is rolled, thereby can obtain bigger pass deformation;

2. because pass deformation is big, thus can reduce by former expect finished product pull out mill train time, reduce intermediate annealing, pickling, the number of times such as lubricated, reduce various material consumptions, middle operation is few, rhythm of production is fast;

3. long plug is a pull core rod, and roller is passive rotation, so device structure is simple, and cost is low;

4. rolling mould, resistance is little, and energy consumption is low, draw speed is fast, and product surface quality is good, and mould consumes little;

5. change the tup in the prior art into reducing, reduce the consumption of metal material, improve lumber recovery;

6. mould is rolled in two of front and back, finishes main distortion for one, and one erects the expansion effect, makes to roll to produce big gap between back plug and the pipe, helps taking off rod.

The present invention compares the also available following form of the advantage that is had with existing cold-drawn and further specifies with cold rolling process.

Claims

1, the technology of a kind of production cold (temperature) processing metal pipe is characterized in that with long plug axially-movable as active force drawing pipe material, long plug expects to pass simultaneously to roll mould with pipe, roll the passive rotation of mould, and pipe material is rolled, roll while pulling out, pull out to roll and subtract the wall extensional in conjunction with what finish the pipe material.

2, technology according to claim 1, it is characterized in that said mandrel drawing needs will manage an end reducing of expecting earlier before rolling pulling out, long plug is inserted in the pipe material, the front end of plug passes the necking end of pipe material, draw the plug front end that it is axially moved, and will manage material and plug is brought into together and rolled mould.

3, technology according to claim 2 is characterized in that said long plug is made up of the pole of two sections coaxial reducings, and its smaller diameter end is a front end, and the necking end of pipe material matches with the smaller diameter end of long plug.

4, technology according to claim 1, it is characterized in that described roller die rolling rolls mould by two multiple rolls and finishes, every is rolled mould N roller is arranged, and two are rolled mould 180/ (N) that misplace mutually and arrange, first is rolled mould and finishes main distortion, and second is rolled mould and play the expansion effect.

5, technology according to claim 4 is characterized in that described every roller that rolls mould constitutes a pass of being with the circular arc angle of sides.