CN1120473A - Cone spiral rolling mill - Google Patents

Abstract

The conic spiral rolling mill is composed of upper and lower working rollers, axial regulation system of rollers, phase regulation system of rollers, prestressed frame, dive system and motor and features mainly that a left-hand spiral pass and a right-hand spiral pass are respectively made on one of two rollers rotating reversely, the central spiral of pass with same pitch is on the norminal surface of roller, and the spiral bean of curved spiral plane of pass has variable pitches. Different passes may be used to produce various solid or hollow special sections with long conic surface.

Description

Cone spiral rolling mill

This invention belongs to the extraordinary section rolling novel rolling mill of conical surface body.

In industrial production and daily life, the extraordinary section bar of conical surface body with big length can be used as lighting standard, flagpole, television antenna bar and traffic signals bar etc., there is multiple shape in its cross section, as the cross section is annulus, elliptical ring, three square rings, polygon ring and corresponding therewith solid section, if be used for the equal strength design or replace some cylinder can save a large amount of metals.Therefore, the extraordinary profile applications prospect of conical surface body is very wide.

At present, be used for city illumination metal lamppost and adopt shearing trapezoidal plate, die forming and the segmentation of straight weld connection technology to produce the conical surface, then each section is welded into product with certain-length.This complex technical process, equipment investment is big, the production cost height, and can not produce solid conical surface section bar.Though adopt cross wedge rolling or oblique milling technology can produce conical surface body, bore post etc. as bearing, can not the bigger conical surface body of production length owing to the restriction that made by frame width and instrument.Therefore, seek the small device investment, produce the common concern that the extraordinary section bar of all kinds of long conical surface bodies has been subjected to domestic and international scientific and technological circle.

The present invention seeks to develop a kind of novel cone spiral rolling mill, given pipe bar is rolled into the conical surface body that the cross section has certain geometrical shape, solve long conical surface body industrial production problem; Realize the deep processing of pipe bar, realize energy-conservation, material-saving requirement.Therefore, can produce huge economic benefit and social benefit.

The present invention adopts and becomes section screw rolling method, is raw material with welded tube, seamless pipe or solid bar, direct rolling conical surface body industry formed product on screw rolling mill.This milling train is different from cross wedge rolling machine from principle and structure, also is different from all kinds of skew rolling mills.It offers helical groove on the opposite working roll of two rotation directions, the pass shape is linear change with roll rotation, and the pitch of pass center helical is constant, rolls the rear cone body length and depends on conical surface helical groove length.Therefore, can produce the very big conical surface body of length.

Cone spiral rolling mill is to constitute (Fig. 1 and Fig. 2) by upper working rolls and lower working rolls (4,5), bearing, bearing block, roll mandrel to parts such as regulating system (2), roll phase-condition system, universal-joint spindle, prestressed stand (1,3), transmission system and motors.Its main points are: on two working rolls, one (5) open left-handed helical groove, another (4) open the right hand helix pass (when the production triangular pyramid, when cross section is semicircle, semiellipse occupied space heart cone, can only offer helical groove at a roll, another roll is a cylinder, as Fig. 4 g, h), pass center helical is positioned on the two rolls name roll surface and has identical pitch, and the helical bundle of pass spiral camber is for changing pitch; Two roll mandrel cross section pass maximum opening degrees and roll rotation angle are linear change, and its pass side helical is a varying pitch, and pass center helical pitch equates; Along on the section of two roll axis, the taper seat roll pass is to form one group of radius continually varying by two rolls combination back on this face to justify (Fig. 2), and the hexagonal pyramid body is a length of side continually varying regular hexagon (Fig. 3) etc.Conical surface body Roll Pass Collocation such as Fig. 4, workpiece be through after the radially and circumferential distortion, can produce bigger extension and along roll mandrel to traversing.

Pass center helical equation is:

X＝D _o/2*cosθ

Y＝D _o/2*sinθ

Z=D _oD in the/2*tg α * θ formula _oBe the roll nominal diameter; α is a lead angle;

Pitch is:

b＝3.14*D _o*tgα

Pass center helical length is:

S＝D _o/2/cosα*θ _o

Because in nominal roll surface topping roll helical groove expanded view is taper type, as shown in Figure 5, can determine the pass maximum opening degree by the principle of similitude, its pass maximum opening degree is: $d=(1-\frac{\mathrm{\θ}}{{\mathrm{\θ}}_o})*d_o$ θ in the formula _oBe the maximum spiral angle of spread of the single cone of correspondence, can be expressed as: ${\mathrm{\θ}}_o=\frac{d_o\cos \mathrm{\α}\cos (\mathrm{\β}/2-\mathrm{\α})}{d_o\sin (\mathrm{\β}/2)}$

Can determine maximum open helical equation up and down according to pass center helical equation and pass maximum opening degree equation, maximum open helical equation is up and down:

x＝D _o/2*cosθ

y＝D _o/2*sinθ $z=D_o/2*\mathrm{tg\α}*\mathrm{\θ}+(1-\frac{\mathrm{\θ}}{{\mathrm{\θ}}_o})*d_o/2$

Fig. 6 has provided according to pass center helical equation and the three-dimensional right-hand helix figure of the determined work roll surface of maximum open helical equation epithyrid maximum opening degree up and down.1 for equidistantly not going up helical among the figure, and 2 for equidistantly not descending helical, and 3 is uniform pitch pass center helical, and three helicals are distributed on the roll name cylinder.

Revolve spiral conical surface pass about can designing according to technology disclosed by the invention and given product size and shape,, can produce all kinds of cone spiral rolling mills by structural principle shown in Figure 1.

Drawings and Examples:

Fig. 1 cone spiral rolling mill structure left view

Fig. 2 cone spiral rolling mill structure right view

Fig. 3 is rolling with positive hexagonal pyramid body to be the helical groove allocation plan of example

The typical Roll Pass Collocation of the corresponding different cross sections of Fig. 4 product

Conical surface pass after Fig. 5 roller surface launches

The distribution of Fig. 6 right hand helix pass maximum open helical on roller surface

The cross-sectional view of the hollow conical surface body of Fig. 7

The cross-sectional view of the solid conical surface body of Fig. 8

Present embodiment is disclosed to be the occupied space heart conical surface body roll pass design of rolling cross sectional shape for circle, can be determined by Fig. 6 and following table by the relation of determined helical groove diameter of technology disclosed by the invention and roll corner.

Get conical surface body diameter at butt end d _o=20mm, cone angle beta=1, roll nominal diameter D _o=50mm, lead angle α=30, calculate to such an extent that the result is as follows:

The taper seat height is 997.37mm, and the maximum start point of roller surface helical is 34.56 radians, and whole circular cone pass changes 5.5 circles, pitch b=90.68mm around nominal roll surface.

Following table is the corresponding relation roll corner/radian 0 3.14 6.28 9.42 12.6 15.7 34.3 passes radius/millimeter 10.0 9.09 8.18 7.27 6.36 5.45 0 of roll corner and taper seat helical groove radius

Use frustum body in the engineering more, conical surface pass can be cut into the frustum pass as required.Fig. 6 both had been the maximum open helical that cuts the rear screw pass on the roll surface.

The cone spiral rolling mill operation principle

With the maximum threaded hole feeding from the roll mandrel cross section of cold conditions or hot blank, the reverse rotation under the driving of transmission system of two rolls at motor, rotation direction is determined according to two roll pass rotation directions, the pass configuration is determined according to conical surface product variety and dimensional requirement, longitudinal extension distortion, radial deformation take place and circumferentially are out of shape and produce and laterally move (Fig. 1 in rolled piece in given change section spiral conical surface pass, Fig. 2), finally realize the screw rolling of the extraordinary section bar of conical surface body.

Claims (4)

1, a kind of cone spiral rolling mill, be by upper working rolls and lower working rolls (4,5), bearing, bearing block, roll mandrel is to regulating system (2), the roll phase-condition system, universal-joint spindle, prestressed stand (1,3), parts such as transmission system and motor constitute, it is characterized in that: on two rollers working roll that directly identical rotation direction is opposite, open left-handed helical groove for one, another opens the right hand helix pass, pass center helical is positioned on the two rolls name roll surface and has identical pitch, the helical bundle of pass spiral camber is for changing pitch, two roll mandrel cross section pass maximum opening degrees and roll rotation angle are linear change, its pass side helical is a varying pitch, pass center helical pitch equates, adopts different pass configurations, can produce the extraordinary section bar of all kinds of solid or hollow long conical surface bodies.

2, cone spiral rolling mill according to claim 1 is characterized in that: pass center helical equation is:

X＝D _o/2*cosθ

Y＝D _o/2*sinθ

Z=D _o/ 2*tg α * θ pitch is:

B=3.14*D _o* tg α pass center helical length is:

S＝D _o/2/cosα*θ。The pass maximum opening degree is: $d=(1-\frac{\mathrm{\θ}}{{\mathrm{\θ}}_o})*d_o$ The maximum spiral angle of spread of single cone is: ${\mathrm{\θ}}_o=\frac{d_o\cos \mathrm{\α}\cos (\mathrm{\β}12-\mathrm{\α})}{D_o\sin \left(\mathrm{\β}12\right)}$ Name roll surface epithyrid maximum opening degree helical equation is:

x＝D _o/2*cosθ

y＝D _o/2*sinθ $z=D_o/2*\mathrm{tg\α}*\mathrm{\θ}+(1-\frac{\mathrm{\θ}}{{\mathrm{\θ}}_o})*d_o/2$

3, according to claim 1,2 described cone spiral rolling mills, it is characterized in that: offer respectively on the double-working rotation direction opposite about revolve helical groove, comprise occupied space heart cone pass, elliptic cone body opening type and the positive polygonal pyramid body opening of occupied space heart type.

4, according to claim 1,2 described cone spiral rolling mills, it is characterized in that: when carrying out triangular cone, cross section and being semicircle, the design of semiellipse occupied space heart cone helical groove, only need to offer corresponding spiral conical surface pass on a working roll, another working roll is not offered pass and is remained cylinder.

Images