CN201558845U

CN201558845U - Cold rolling die suitable for special tube of double-roll cold rolled tube machine

Info

Publication number: CN201558845U
Application number: CN2009203029843U
Authority: CN
Inventors: 姜方余
Original assignee: Wenzhou Jinluo Mechanical Equipment Manufacturing Co Ltd
Current assignee: Wenzhou Jinluo Mechanical Equipment Manufacturing Co Ltd
Priority date: 2009-05-10
Filing date: 2009-05-10
Publication date: 2010-08-25
Anticipated expiration: 2019-05-10

Abstract

The utility model relates to a cold rolling die suitable for special tube of double-roll cold rolled tube machine which uses a common round tube blank to roll a special tube on a circular hole or semi-circular double-roll cold rolled tube machine at least of the cross section shape of inside or outside surface of which is a non-circular geometric style. The cold rolling die suitable for special tube of double-roll cold rolled tube machine is characterized in that the motion trail of the working surfaces of the mandril of an inner mold and the pressing section of the hole pattern wall thickness of an outer mold on a rolling working cone are changed according to the rules of plane, paraboloid, hyperboloid, cycloid, logarithmic curve or curves of other reasonable types, and gradually transit from the round at the starting end to the tapered horn shape of the surface cross section of the non-circular special tube at the stopping end. The cold rolling die suitable for special tube of double-roll cold rolled tube machine serves as a cold rolled die producing special tube materials, not only is suitable for cold rolled tube machine taking steel and alloy thereof as materials, but also is suitable for cold rolled tube machine taking non-ferrous metal like copper, aluminum, etc, and alloy thereof as materials.

Description

A kind of cold rolling mould of special pipe that is applicable to two-high pilger cold-rolling mill

Technical field

The utility model is a kind of cold rolling seamless pipe machines of two rollers (hereinafter to be referred as cold pilger mill) that are applicable to, the cold rolling mould that rolling special-shaped seamless metal pipe (hereinafter to be referred as special pipe) uses.

Background technology

Special pipe is the chief component in the economic metals tubing kind.In industrial and agricultural production and other every economic activities, use heterotype tubing energetically, not only can save a large amount of metals and cut down finished cost, can also increase substantially the many serviceabilities and the function of place facility.Therefore various in recent years heterotype tubings have obtained development rapidly.

At present, heterotype tubing mainly uses cold-drawing process and the multiple roll cold-rolling practice is produced, and these method rolling passes are many, deformation coefficient is little, limited its practical scope, and the high-quality of many market in urgent needs, high-accuracy shaped pipe can't be produced in a large number.In addition, pipe in the outer four directions that the nuclear power field is used always mainly is that processing cost and manufacture difficulty are big by hot-extrusion method production at present, and is by import substantially.On the other hand, the present a fairly large number of two-high pilger cold-rolling mill of China can't not produced special pipe because of there being proper mold.

For addressing the above problem, the utility model provides a kind of two-high pilger cold-rolling mill that is applicable to, the cold rolling special pipe external mold mould＜pass of annular pass and semicircle pass〉and internal mold mould＜plug.

Summary of the invention

The utility model provides a kind of cold rolling mould of special pipe that is applicable to two-high pilger cold-rolling mill, and this mould is made up of the external mold pass of an internal mold plug and two symmetries; The internal mold plug comprises screw terminal, column part, sizing reduction section, wall thickness reduction section, pre-Strain During Finishing Stage and typing section, and each external mold pass respectively comprises engaging-in section, sizing reduction section, wall thickness reduction section, pre-Strain During Finishing Stage, typing section and nibbles out section; It is characterized in that: the shape of the typing section of internal mold plug is identical with the shape of finished product special pipe inside, and the shape of the typing section of external mold pass is identical with the production tube outer shape; Use this mould can roll out on two-high pilger cold-rolling mill that at least one is the profiled metal tubing of non-geometry of the circle shape in the inside of production tube or the outer surface shape of cross section.

Further, the movement locus of wall thickness reduction section on rolling Drawing cone of internal mold plug and external mold pass is plane, parabola, hyperboloid, cycloid face or logarithmic curve face, and the wall thickness reduction section of internal mold plug and external mold pass is tubaeform for the convergent that the circle by top transits to the non-round special pipe surface configuration of terminal gradually.

Further, the inside of the described profiled metal tubing that rolls out or outer surface shape of cross section are interior irregular excircle shape, the outer abnormity of interior circle or inside and outside equal abnormity.

Further, the external mold pass of described symmetry is annular external mold pass or semicircle external mold pass.

The beneficial effects of the utility model are: this shape tube mould can be directly applied for existing two-high pilger cold-rolling mill, has therefore reduced the production and processing cost; Utilize this shape tube mould directly to roll out production tube simultaneously, reduced operation, correspondingly improved the quality and the production efficiency of product by two-high pilger cold-rolling mill.

Description of drawings

The cold rolling mould of Fig. 1 two-high pilger cold-rolling mill annular pass special pipe is formed schematic diagram

Fig. 2 internal mold plug schematic diagram

Fig. 3 external mold annular pass schematic diagram

The cutaway view along the A-A direction of Fig. 4 external mold annular pass

The semicircle pass schematic diagram of Fig. 5 external mold

The cutaway view along the B-B direction of the semicircle pass of Fig. 6 external mold

The cold rolling mould of the semicircle pass special pipe of Fig. 7 two-high pilger cold-rolling mill is formed

1 internal mold plug, 2 annular lower passes, 3 annular epithyrids, 4 special pipes

11 screw terminals, 12 column parts, 13 sizing reduction sections, 14 wall thickness reduction sections, 15 pre-Strain During Finishing Stage 16 typing sections

21 engaging-in sections 22 sizing reduction section 23 wall thickness reduction sections 24 pre-Strain During Finishing Stage 25 typing sections 26 are nibbled out section

31 engaging-in sections 32 sizing reduction section 33 wall thickness reduction sections 34 pre-Strain During Finishing Stage 35 typing sections 36 are nibbled out section

41 internal mold plugs, 42 semicircle lower pass 43 semicircle epithyrid 44 special pipes

The specific embodiment

The utility model is made up of two external mold lower passes 2 and epithyrid 3 that an internal mold plug 1 and each shape and size are all symmetrical fully as shown in Figure 1, is rolling to the special pipe 4 that possesses one of following feature less with circular pipe on two-high pilger cold-rolling mill:

(1) interior shape is circular, and the outside is shaped as the profiled metal tubing of the positive geometric form of regular polygon or other suitable shape;

(2) interior shape is the positive geometric form of regular polygon or other suitable shape, and the outside is shaped as circular profiled metal tubing;

(3) interior shape is the positive geometric form of regular polygon or other suitable shape, and the outside is shaped as the profiled metal tubing of the positive geometric form of regular polygon or other suitable shape.

The concrete structure of internal mold plug as shown in Figure 2.Be divided into six sections of screw terminal 11, column part 12, sizing reduction section 13, wall thickness reduction section 14, pre-Strain During Finishing Stage 15 and typing sections 16 etc.Plug tightens up a screw 11, the planform and the size of column part 12, sizing reduction section 13, all with rolling same specification, the production tube interior shape is that circular plug is identical.Top by wall thickness reduction section 14 begins, and to the top of pre-Strain During Finishing Stage 15, the shape of generatrix of plug working profile according to the metal plastic deformation principle, carries out the transition to interior shape near the finished product special pipe gradually by circle.The appearance profile line in this section vertical section on the plug, different according to institute's tube rolling material size, shape and material are respectively the secondary or the high order curve of logarithmic curve, cycloid, parabola, hyperbola or other reasonable patterns.

Pre-Strain During Finishing Stage 15 is that non-geometry of the circle shape is horn-like, and the top size and dimension is near the inside dimension and the shape of finished product special pipe, and tip dimensions and shape equal the inside dimension and the shape of finished product special pipe.

The size and shape of typing section 16 is identical with the size and shape of finished product special pipe inside.

The external mold pass is the symmetry installations up and down as shown in Figure 1 of two annular passes as shown in Figure 3 and Figure 4; Also can be as shown in Figure 5 and Figure 6 be two semicircle passes as shown in Figure 7 up and down symmetry install.

With Fig. 3 is example, is followed successively by engaging-in section 21, sizing reduction section 22, wall thickness reduction section 23, pre-Strain During Finishing Stage 24, typing section 25 on the pass, nibbles out section 26.

Engaging-in section 21 is that pass is to the engaging-in gradually stage of pipe when entering the rolling cycle, and its hole slot diameter (hereinafter to be referred as the aperture) is bigger by 2～5% than pipe; Decide according to the concrete condition of pipe and pass outside dimension at the stroke angle, is generally 8%～12% of pass total kilometres angle.

Sizing reduction section 22 is initial stages of rolling work, and pipe is diameter reduction only here, and wall thickness slightly increases.This sector hole footpath is risen by top, parabolically or the rule of other suitable form curve, is decreased to wall thickness reduction section top successively, and its stroke angle is about 4%～6% of pass total kilometres angle.

Wall thickness reduction section 23 is main deformation stages of tube rolling.According to the concrete condition of institute's tube rolling material shape, size and material, begin to finish by this section top to end, pass is followed the basic principle in the metal plastic deformation process, and the blank tube wall is carried out continuous mandatory roll compacting.The movement locus of this sector hole type half hole slot working surface on rolling Drawing cone, by the rule variation of plane and parabola, hyperboloid, cycloid face, logarithmic curve face or other proper form curved surfaces, the convergent that is transitted to the non-round special pipe surface configuration of terminal by the circle at top gradually is tubaeform.Its stroke angle accounts for about 50% of pass total kilometres angle.

The effect of pre-Strain During Finishing Stage 24 is to carry out preliminary finishing through the hollow billet after the wall thickness reduction section drastic deformation; Basically be that the non-geometry of the circle shape of convergent identical with the production tube outer shape is horn-like from front to back; Its stroke angle is about 10%～15% of pass total kilometres angle.For the special pipe of mill product thickness of pipe wall, also pre-Strain During Finishing Stage can be set separately greater than 1 millimeter.

25 pairs of special pipe product qualities of typing section play crucial effects.This sector hole type shape is consistent with the production tube outer shape.Be not more than 1 millimeter special pipe for the mill product thickness of pipe wall, this sector hole footpath is begun to end outlet by top, should be the back taper trumpet type that enlarges to some extent rallentando of rule parabolically; Its tapering is 1: 200～1: 500.This section stroke angle is about 15%～20% of pass total kilometres angle.

Nibbling out section 26 is pass sections of withdrawing from after this rolling end.Its pass half hole slot spine curve by the terminal special pipe outer shape of typing section, changes the round-shaped and size that transits to engaging-in sector hole type half hole slot rapidly.

The utility model can have following two types of embodiments:

Embodiment (I)

Has the utility model feature with above-mentioned, by an internal mold plug and two cold rolling moulds of a cover that all complete symmetry equivalent annulus external mold pass of shape and size is formed, as shown in Figure 1, be installed on the two-high pilger cold-rolling mill that adopts the annulus hole shape, get final product the heterotype tubing of rolling required form (legend is a square).

Embodiment (II)

Has the utility model feature with above-mentioned, by an internal mold plug and two cold rolling moulds of a cover that all complete symmetry equivalent semicircle external mold pass of shape and size is formed, as shown in Figure 7, be installed on the two-high pilger cold-rolling mill that adopts the semicircle pass, get final product the heterotype tubing of rolling required form (legend is a square).

Claims

1. cold rolling mould of special pipe that is applicable to two-high pilger cold-rolling mill, this mould is made up of the external mold pass of an internal mold plug and two symmetries; The internal mold plug comprises screw terminal, column part, sizing reduction section, wall thickness reduction section, pre-Strain During Finishing Stage and typing section, and each external mold pass respectively comprises engaging-in section, sizing reduction section, wall thickness reduction section, pre-Strain During Finishing Stage, typing section and nibbles out section; It is characterized in that: the shape of the typing section of internal mold plug is identical with the shape of finished product special pipe inside, and the shape of the typing section of external mold pass is identical with the production tube outer shape; Use this mould can roll out on two-high pilger cold-rolling mill that at least one is the profiled metal tubing of non-geometry of the circle shape in the inside of production tube or the outer surface shape of cross section.

2. the cold rolling mould of special pipe according to claim 1, it is characterized in that: the movement locus of wall thickness reduction section on rolling Drawing cone of internal mold plug and external mold pass is plane, parabola, hyperboloid, cycloid face or logarithmic curve face, and the wall thickness reduction section of internal mold plug and external mold pass is tubaeform for the convergent that the circle by top transits to the non-round special pipe surface configuration of terminal gradually.

3. the cold rolling mould of special pipe according to claim 1 is characterized in that: the inside of the described profiled metal tubing that rolls out or outer surface shape of cross section are interior irregular excircle shape, the outer abnormity of interior circle or inside and outside abnormity.

4. according to the cold rolling mould of arbitrary described special pipe among the claim 1-3, it is characterized in that: the external mold pass of described symmetry is annular external mold pass or semicircle external mold pass.