CN1019877C

CN1019877C - Technology for drawing-rolling circular pipe with long-mandrel rool die

Info

Publication number: CN1019877C
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: 1993-01-27
Anticipated expiration: 2005-07-11
Also published as: CN1047229A

Abstract

The present invention relates to the process for drawing and rolling a circular tube by a long mandrel multi-roll mould, which is used for producing coldly (warmly) processing non-ferrous metal circular tubes and ferrous metal circular tubes. The present invention uses a roll mould for replacing a fixed mould, and uses the axial motion of the long mandrel as the main power to draw tube materials; the long mandrel and the tube materials are simultaneously driven to penetrate through the roll mould so that the roll mould can passively rotate, and the tube materials can be rolled. When the drawing is carried out, the rolling is carried out; the wall-reducing extended deformation of the tube materials can be finished by the combination of the drawing and the rolling, and a normal drawing producing method is changed into a method of the combination that a single roll is transmitted, drawn and rolled. Compared with the present cold rolling process, the present invention has the advantages of large track deformation, few intermediate processes, quick production rhythm, simple device structure, low investment, low energy consumption and various kinds of consumption, and high yield rate.

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 frictional resistance between metal and the mould 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 a kind of long plug tube drawing technology in the U.S. Pat 2428474, adopted long plug and fixed mould.When draw begins, be mounted on the caliper arrangement on the pipe afterbody plug, will become thrust, pipe is pushed the deformed area the pulling force of plug to pipe.Unclamp the afterbody clamp then, draw plug drive pipe to pass through mould with plug, its goal of the invention is by two groups of pinch rolls and loose dress mould in the process, makes the pipe after pulling out be easy to loose excellent.Outside its deficiency be: use fixed die draw resistance to exist, cause the energy consumption height, product surface quality is not good enough, and the mould consumption is big, and pipe need lean on thrust feeding, complex technical process when entering the deformed area.

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 the cloudy power of a kind of machining deformation, 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 mould with rolling mould, long plug is made up of the pole of two sections coaxial reducings.To manage an end reducing of material before the draw earlier, reducing matches with the size diameter changeover portion of long plug, long plug is inserted in the pipe material, the necking end that its smaller diameter end passes pipe material draws the smaller diameter end of plug that it is axially moved, and will manage to expect to bring into plug 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 the 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, mandrel drawing need pull out roll before earlier with an end reducing of materials in the tube 2, reducing matches with the size diameter changeover portion of long plug. Then long plug is inserted in the materials in the tube, its smaller diameter end passes the necking end of materials in the tube and passes and roll mould 3,4. Draw the plug smaller diameter end that it is axially moved, and materials in the tube and long plug brought into together roll mould. Because the reducing of materials in the tube is to match with the smaller diameter end of long plug, so materials in the tube enter the deformed area together with plug when elongating plug.

Rolling mould rolls mould to materials in the tube rolling by two multiple rolls and finishes. Every is rolled mould and N roller is arranged, two sequences in front and back (180 °)/(N) layout. First rolls mould and finishes main distortion, and second is rolled mould and play the expansion effect. Be conducive to like this to roll rear plug and pipe way and produce bigger gap, be easy to take off rod. Every N roller that rolls mould consists of pass such as a Fig. 3 with the circular arc angle of sides. When Elongate plug and do axially-movable and drive materials in the tube and long plug together when rolling mould, materials in the tube and the drawing rub power of rolling between the mould make two passive rotations of roller of rolling mould be rolled materials in the tube.

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.

The long plug fixed die of processing method long rod rolling mould tube drawing tube drawing cold pilger mill tube rolling

Index relative value % % %

Equipment investment 100 150 250

Output 100 75 60

Lumber recovery 100 90 100

Energy consumption of unit product 100 130 200

Unit product processing charges 100 140 160

Claims

1, a kind of technology of production cold (temperature) processing metal pipe, adopt long plug and mould, with the axially-movable of long plug as active force drawing pipe material, it is characterized in that: the mould that is adopted is for rolling mould, long plug is made up of the pole of two sections coaxial reducings, to manage an end reducing of material before the draw earlier, reducing matches with the size diameter changeover portion of long plug, and long plug is inserted in the pipe material, and the smaller diameter end of plug passes the necking end of pipe material, draw the plug smaller diameter end that it is axially moved, to manage material and bring into plug and to roll mould, and roll the passive rotation of mould, and the pipe material is rolled, roll while pulling out, pull out to roll and subtract the wall extensional in conjunction with what finish pipe material.

2, technology according to claim 1, it is characterized in that describedly rollingly rolling mould by two multiple rolls and finishing, every is rolled mould N roller is arranged, two roll mould misplace mutually (180 °)/(N) arrange, first is rolled mould and finishes main distortion, second is rolled mould and plays the expansion effect, every pass that rolls a band of N the roller formation circular arc angle of sides of mould.