CN1351909A - Rotary driving device for roller hole type Pilger cold mill capable of alternatively rolling - Google Patents

Abstract

In a method for adjusting a rolling curve of drive pinions of ring rollers to a neutral zone within a tapering portion of a roll pass of the ring rollers of a cold pilger rolling mill, circular pinions are arranged and secured eccentrically on a roller axis of the ring roller.

Description

The rotating driving device of the roll pass of Pilger cold mill capable of alternatively rolling

The present invention relates to annular roll drive pinion rolling curve is adapted to a kind of method of Pilger cold-rolling mill annular roll taper pass differential gap.

That the Pilger cold-rolling mill is suitable in a procedure will pushing with long comparatively speaking distance, hot rolling or metal pipe continuous casting, heavy wall, but especially copper pipe base tube reducing becomes the tubing than small eccentricity of having of long, thin-walled and drawing.

Applied Pilger cold-rolling practice is a kind of metal tube milling method of retrofiting, and realizes tube reducing and subtracts wall thickness with bigger remodeling amount in the method.

Fixing herein, when rolling, be positioned at tubing inside at roller core tapered on the rolling direction.Roller core is fixed on the long core bar, and core bar clamps and is fixed on the roller core bearing.

The rolling in reciprocating stroke of roll pair is positioned at the tubulose strip plate on the roller core and it is elongated the dough roller when similar roll extrusion and elongation dough.

But the roll pair is bearing on the rolling-mill housing of an alternate reciprocating motion and when gantry motion and is driven by the pinion that links to each other with rolling-mill housing, and pinion meshes with two fixing tooth bars.The rolling-mill housing of design of section of rolling mill and vibration is synchronously back and forth rolled simultaneously.

Rolling-mill housing itself realizes moving back and forth by the bent axle transmission as engine piston.Roll pass be sub-circular and in the common structure of prior art whole roll on circumference, dwindle.Between roll and the roller core dwindle gradually or tapered cross section is carried out tube reducing and is subtracted wall thickness strip plate simultaneously.

At least one dead point place's milling train short time in two dead points discharges pipe, and wherein pipe is pushed ahead also/or for example about 60 ° of rotation simultaneously.Not only forward stroke but also backstroke all are used for remodeling in this method.The feeding and the anglec of rotation in two dead points depend on tubing and quality requirement.For specific alloy, the plasticity of drawn and rolled tube is from 400 Ns/millimeter ²To surpassing 1500 Ns/millimeter ²

The principle diagram of aforementioned tubes material rolling method can draw from the sketch of Fig. 2 a to 2d.Fig. 2 a tube reducing in the feeding process that drawn.Fig. 2 b is the cross-sectional view that shuts out in A-B cross section.Fig. 2 c drawn in the backstroke tube reducing and Fig. 2 d is the cross-sectional view that shuts out in A-B cross section.

Combine with the online coiling machine manufacturing of the coiling tubing that for example can realize 250 meters long of Pilger cold-rolling mill.By the step-by-step movement feeding, tubing back and forth rotation, that shut out by the Pilger cold-rolling mill bends to the pipe volume and directly puts into in the necessary basket of back to back drawing process in the operation of rolling at this.

Still have tangible advantage though aforesaid remodeling process speed of production according to the Pilger cold rolling process is low for a lot of application scenarios:

-this in some cases remodeling process can access relatively large diameter cross and reduce reduction with wall thickness, and

-can effectively prevent because the off-centre that produces in a circumferential direction of compensate for strain, and

-making when long because mechanical refining obtains best material structure than long tube.

The Pilger cold-rolling process that is used to make tubing exists

The diameter of-rolled piece and wall thickness have very little error,

-there is not a spillage of material that causes by operation,

-for the material that is difficult to retrofit applicability is arranged also,

-by using heavier and the longer pipe base has better economic, and

-produce by a kind of pipe specification under the situation of different termination product specifications

Can access circularity preferably, relative stress uniformity and surface roughness.

However under the prior art state because still there are some defectives in geometrical relationship on the whole haul distance of Pilger stepping milling train, promptly pass rolling radius changes in very on a large scale in the operation of rolling when not changing the driving wheel radius.Pass is forced to slide to the tubing that is rolled in addition, makes its debase thus.Produce axial thrust other defective, the influence of rolled quality at this and cause a series of problems.Can make like this with common amount of feeding rolling thin-wall blank and become very difficult or impossible fully, because the mutual wedging when rolling of blank end face makes the corresponding reduction of milling train efficient thus.Milling train very high mechanical load and load all occur and makes milling train be in the wearing and tearing of acceleration in its all functional part in addition.Especially to consider the fracture of roll and roller core and to other important damage of milling train.

Another shortcoming of prior art is that the remodeling that is used for that the backstroke of rolling-mill housing can only be limited moves, because the maximum power of rolling of returning appears at backstroke usually.This will cause, on principle reasonably, additional blank feed distance can not be utilized fully and the production efficiency that may reach is restricted shutting out the place, dead point.

In addition because prior art also is restricted the technical possible tube reducing of remodeling.The problem that pitch circle produced of being joined by local discomfort along with lasting tube reducing also can increase.This point has also been damaged the economy of Pilger cold-rolling process.

Known in order to remedy the prior art defective in addition: the pinion pitch circle of circular shape concentric setting and roller diameter will be complementary with the rolling size of reality.But can only realize limited operation of rolling improvement thus.

The helical pinion is adopted in 17 52 996 suggestions to this document DE-OS, this gear and tiltedly spur rack engagement.There is major defect in known solution, promptly loses available pass length thus, and rolling efficiency is reduced.This in addition solution is subjected to the constraint of linear tooth bar.Because when pass launches to obtain one more high position parabolical the time, here can only be very limitedly near theoretical curve.

Be derived from the above-mentioned state of the art, the objective of the invention is to, a kind of method that drives Pilger cold-rolling mill roll pair is provided, this method can make the rolling curve of pinion obtain basic improvement for the suitability of annular roll taper pass differential gap.

In order to achieve this end the suggestion according to the present invention, annular roll shrinks pass differential gap employing circular pinion and this pinion is provided with prejudicially and is fixed on the roll mandrel for the rolling curve that makes annular roll driving pinion adapts to.Can realize following purpose by the present invention:

-reduce pressure load to the feeding slide,

-prevent because the uncontrollable feeding that relative motion causes between roll profile and the rolled piece,

-reduce roll wear,

-reduce energy resource consumption by the power of reducing friction,

-make the rolling curve of pinion adapt to annular roll taper pass differential gap,

-avoid in the known solution in front the defective that still exists.

A kind of design of the present invention is, for driving pinion-and drive the corresponding sinusoidal tooth bar of annular roll-employing thus.

Can reduce or prevent the defective of technology unsatisfactory and device in the prior art according to solution of the present invention, for example the slippage of roll pair on rolled piece has aforesaid for the defective of rolled products and milling train and the defective that reduces production efficiency.

Another design according to the inventive method is, when the circular eccentric pinion that adopts with corresponding sinusoidal tooth bar engagement, below four parameters to adapt to actual rolling size:

-roller diameter

-pinion pitch circle

-eccentric throw

-to the position, angle of rolling-mill housing inlet dead point eccentric throw.

Other details of the present invention and feature are provided by claims and following description to a kind of illustrated embodiment of the present invention.Be illustrated as:

The geometrical relationship figure hoist pennants of Fig. 1 Pilger cold-rolling mill on whole haul distance

Fig. 2 a to Fig. 2 d has the milling method of the present invention of each operation:

Reducing in Fig. 2 a feed distance has the pinion of arranged off-centre

The cross section of Fig. 2 bA-B intercepting

Reducing in Fig. 2 c backstroke

The outlet cross section of Fig. 2 dA-B intercepting

This fully known Pilger cold-rolling practice is shown in Fig. 2 a to 2d.It is used for making pipe fitting 12 or making pipe fitting 12 remodeling by a pair of Pilger cold roll pair 10,10 ', and described roller pair is bearing on the unshowned rolling-mill housing.Pipe fitting 12 to be processed is on roller core 13.Rolling-mill housing is implemented a kind of oscillating movement in the operation of rolling, wherein stroke frequency was up to 300/ minute even more.Pipe fitting 12 is by roll pass 11, and 11 ' makes its final shape or profile; Roll pass 11,11 ' cuts in the relative roll 10 or 10 ' on whole excircle, and circumference sealing ground surrounds pipe fitting 12 (to see Fig. 2 b and 2d) in the roll seam.Roll pass 11 or 11 ' here corresponding to the expansion that its calibration has various width and/or a degree of depth-on roll circumference see-, this in Fig. 2 a or 2c with roll pass shown in the hacures 11 and 11 ' expression.

Pipe fitting 12 moves along carriage direction R in the operation of rolling.In the feed distance shown in Fig. 2 a, complementary Pilger cold roll secondary 10 and 10 ' rolls on pipe fitting 12 along carriage direction R, this pipe fitting 12 in the roll seam by roll pass 11 and 11 ' encirclement.In the backstroke shown in Fig. 2 c, the rolling of roll secondary 10 and 10 ' on pipe fitting 12 is that the rightabout along carriage direction R carries out (seeing the arrow of rotation direction 14 and carriage direction 15 among the figure).

In Fig. 1 with drawn briefly geometrical relationship on the whole haul distance of Pilger cold-rolling mill of the form of chart.In this chart, provide a series of data or the parameter of an embodiment as follows:

Copper pipe rolling 87 * 11 to 40 * 2

Roller diameter 375mm

Pinion pitch circle 336mm

Frame stroke 1.023mm

Reducing pass length 600mm

Smooth pass length 140mm

Pinion eccentric throw 13mm

Error angle 140 degree

Pass as the pass bottom curve launches and can be made up of following several parts:

-zone 1 discharges rolled piece so that feeding and rotation at this district's roll,

-diameter reducing area 2, parabolic function is deferred in this district,

-cylindrical clear area 3,

-transition region 4 can additionally be rotated and/or feeding at this district's rolled piece.

Curve 5 expression neutral lines, the longitudinal force that produces owing to different mill speeds in this layer is neutralized.

Rolled piece part at the bottom of the pass and between the neutral line is rolling with lower speed, and the part between roll external diameter 6 and the neutral line 5 is rolling with higher speed.

The pinion pitch circle can conform to curve 5, its equally also will in and longitudinal force, longitudinal force is owing to the rolling ratio that changes on whole pass length produces.And the pinion 7 of circular concentric setting can only be by halves near this demand.Because: the too fast circumferential speed component in pass district in front accounts for main component, and peripheral speed is too slow again in the smooth scope of clear area 3 in contrast.Just relation is temporary transient correct when about 120 ° roll angle of spread.

If but pinion is to be provided with (8) prejudicially according to suitable mode of the present invention, then can realize extremely being neutralized to a great extent near the motion trend of curve 5 of striving reaching and rolled piece.Roll circumference can be utilized without restriction and curvilinear motion can conform to theoretical curve better than prior art.

Claims (3)

1. the rolling curve of annular roll driving pinion is adapted to method, can use circular pinion and this pinion to be provided with prejudicially and to be fixed on the roll by this method in differential gap, Pilger cold-rolling mill annular roll taper aperture.

2. the method for claim 1 is characterized by, for driving pinion-and then drive the corresponding sinusoidal tooth bar of annular roll-use.

3. as each described method in claim 1 or 2, it is characterized by, when the circular eccentric pinion that uses with corresponding sinusoidal tooth bar engagement below four parameters to adapt to actual rolling size:

-roller diameter

-pinion pitch circle

-eccentric throw

-to the position, angle of rolling-mill housing inlet dead point eccentric throw.

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