CN1047637A

CN1047637A - Push piercing mill for processing hollow round bodies

Info

Publication number: CN1047637A
Application number: CN 90103857
Authority: CN
Inventors: 克奥姆斯·奥伯特
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-05-31
Filing date: 1990-05-29
Publication date: 1990-12-12
Also published as: WO1990014900A1; AU5658790A

Abstract

The push piercing mill of the invention has 5 work rolls (0) for processing a pentagonal blank (B) into a hollow circular body.

Description

The pushing roll piercing mill of processing open circles body

The present invention relates to polygon steel billet or nonferrous metal compact are processed into the open circles body to produce the pushing roll piercing mill of seamless pipe.

Existing pushing roll piercing mill has the roll of a pair of formation circular hole.With about quadrangle blank heating to 1275 ℃, again with one less than promoting blank by the axial force that is added in the deformation drag that pressure produced on the whole quadrangle material section, the front end of blank is entered in the guider, withstand on the perforation aploid of fixing, this aploid is to aim at its central axis to be provided with in the circular hole that is made of a pair roller.Therefore, blank forms a hole and rolls into the hollow cylinder body in blank under the effect of roll and perforation aploid.

A medium-sized pair of roller pushing roll piercing mill is shown in Fig. 1 and Fig. 2.This roll piercing mill has work roll (1), a pushing piston (a), a centring device (b) and the perforation aploid (c) by a pole (d) support of a pair of band circular hole.Pushing piston (a) acts on and makes it be rolled into hollow cylinder body (e) on the quadrangle blank (L) under the effect of roll and perforation aploid.

The object of the present invention is to provide a kind of than the more efficiently pushing roll piercing mill of the two roller pushing roll piercing mills of plain edition.

Therefore the present invention relates to a kind ofly polygon steel billet or nonferrous metal compact are processed into the open circles body to produce the pushing punch of seamless pipe as what claim 1 limited.

According to a best form of implementation of the present invention, the pushing roll piercing mill has 5 work rolls that the pentagon blank are processed into the open circles body.

Other principal characters of this pushing roll piercing mill are limited in each dependent claims of claim 1.

By can be to the accompanying drawing of an embodiment of this pushing roll piercing mill and explanation thereof to the present invention solve more clear.

Fig. 1 is the profilograph of a pair of roller plain edition pushing roll piercing mill;

Fig. 2 is by pushing the I-I profile at roll piercing mill center among Fig. 1;

Fig. 3 pushes the II-II profilograph of roll piercing mill for the present invention among Fig. 4;

Fig. 4 is for being positioned at the III-III profile of the pentagon blank that pushes the roll piercing mill porch among Fig. 3;

Fig. 5 is IV among Fig. 3-IV profile;

Fig. 6 always schemes for the top view that example is installed that the present invention pushes roll piercing mill;

(Fig. 7 is the difference between the situation (Fig. 7 b) when beginning to contact plain edition pushing roll piercing mill roll with blank a) to Figure 7 shows that situation when blank begins to contact the present invention and pushes the roll piercing mill roll;

Figure 8 shows that and the present invention push the roll piercing mill roll (Fig. 8 a) and the difference between the plain edition pushing roll piercing mill roll (Fig. 8 b).

The roll piercing mill of pushing shown in Fig. 3-6 has 5 work roll O.These rolls can come transmission by one or more electro-motors or hydraulic motor.For example, with one of them roll of motor transmission, more thus roll by other roll of a gear train transmission.According to another form of implementation, these 5 rolls can come transmission with independent motor respectively.

The present invention pushes roll piercing mill and compares first principal advantages that is had with two roller plain editions pushing roll piercing mills and be shown in significantly among Fig. 7 a and the 7b.Shown in Fig. 7 a, when pentagon blank B entered milling train, 5 roll O were respectively with its bottom land contact blank, at this bottom land place, the diameter of roll is substantially equal to drive diameter, just, concerning this diameter, its peripheral speed equals the speed of hollow body substantially.

Different therewith, in plain edition pushing roll piercing mill, shown in Fig. 7 b, two roll O at first respectively contact the side of quadrangle blank L, and at the diameter of this contact position greater than drive diameter, thereby produced slip, cause the reduction of coefficient of friction, also just reduced driving force, also may on blank, form harmful bulging phenomenon at this transition period.

In addition, perpendicular to contact surface, driving force E then is in the variant plane at the situation downforce P of two roller plain editions pushing roll piercing mills, and therefore just the component of pressure P in vertical plane helps transmission.And under the situation of five rollers pushing roll piercing mill, pressure P and frictional drive power E are in same plane (being vertical plane).

Second significant advantage of five rollers pushing roll piercing mill is: under the identical situation of external diameter, (Fig. 8 a) compares with two roller pushing roll piercing mills (Fig. 8 b) five rollers pushing roll piercing mill, has obviously bigger groover rot diameter, thereby has bigger drive diameter.Therefore, the transmission capacity of five rollers pushing roll piercing mill is significantly greater than two roller pushing roll piercing mills.In addition, minimum diameter D under the situation of five rollers pushing roll piercing mill ₅And maximum dimension D _TBetween the difference of peripheral speed little.Therefore, slide light and coefficient of friction is higher.Under the situation of two roller pushing roll piercing mills, minimum diameter D ₂And maximum dimension D _TBetween the difference of peripheral speed very big.Therefore, it is more serious to slide, and coefficient of friction is reduced.These two situations add described before this situation, make the increase of the difference aspect transmission capacity between the two, make five rollers pushing roll piercing mill more favourable in this respect.Therefore, concerning five rollers pushings roll piercing mill, can select the much smaller roll of two roller plain editions pushing roll piercing mills for use, thereby its volume is greatly reduced, make blank inlet guide device and the aploid pole guider can be close mutually.

The 3rd significant advantage of five rollers pushing roll piercing mill still can draw from Fig. 7 a and 7b.Under the situation of five rollers pushing roll piercing mill, as shown in the figure, the both sides of contact point have identical transmission and deformation condition (promptly having symmetry) between blank and roll, and quite different under the situation of two roller plain edition pushing roll piercing mills.Therefore, energy is fully utilized, and makes distortion bigger more balanced.

The above pushes the feature of roll piercing mill and makes professional's a glance of deformation processing aspect just find out the percentage elongation that adopts pushing roll piercing mill of the present invention can obviously increase hollow body with respect to two roller plain editions pushing advantages that roll piercing mill had.Simultaneously, for the professional, can find out significantly, increase percentage elongation and mean and reduce eccentricity, therefore can draw the more well-balanced hollow body of wall thickness in the outlet of pushing roll piercing mill.

Clearly, pushing roll piercing mill of the present invention is not limited to above-described form of implementation, adopts three rollers, four rollers, six rollers or more rolls the limit number can be equaled equally or the polygon blank of roll quantity multiple is processed into hollow body.

The surface of polygon blank can be planar shaped, concave shape or convex.

As shown in Figure 6, the pushing roll piercing mill can dispose two or more aploid poles, and these poles are alternately to use by having hydraulic pressure or electronic control and the dolly of locking device.

When adopting arrangement shown in Figure 6 to bore a hole operation, piston push rod m acts on the pentagon steel billet B of centring axis in advance.The aploid p that is contained on the pole q is on the operating position in the roll piercing mill frame that is made of each roll O, and transposer r can make a pole q or another pole q ' in two aploid poles alternately in place.

So just can simplify on the present plain edition pushing roll piercing mill operation to the complexity of aploid pole, it is also more economical that machine is made in perforation.

In addition, aploid and pole thereof can be cooled off with fluid all the time internally, make the surface of aploid avoid the infringement of excessive temperature, and fluid can adopt closed circuit cooling, also can under high pressure use.

Consider the above technologic advantage, the present invention pushes roll piercing mill and can adopt the polygon ordinary steel obtained by direct casting, be processed into high-quality seamless steel pipe.

Claims

1, pushing punch, in order to polygon steel billet or nonferrous metal compact (B) are processed into the open circles body to produce seamless pipe, it is characterized in that: these facility have a plurality of work rolls (0), and the limit number of its quantity and blank is quite or be the multiple of its limit number.

2, the described pushing roll piercing mill of claim 1, it is characterized in that: these facility have 5 work rolls, in order to pentagon blank (B) is processed into the open circles body.

3, claim 1 or 2 described pushing roll piercing mills is characterized in that: aploid and aploid pole are cooled off with fluid from its inside all the time.

4, the described pushing roll piercing mill of above arbitrary claim is characterized in that: these facility have interchangeable a plurality of aploid (P) and aploid pole (q, q ').

5, in order to the described pushing roll piercing mill of last arbitrary claim the plane polygon blank is processed into the open circles body.

6, with the described pushing roll piercing mill of claim 1-4 concave surface polygon blank is processed into the open circles body.

7, with the described pushing roll piercing mill of claim 1-4 convex surface polygon blank is processed into the open circles body.