CN102489638A - Radial and axial roll-forming method for large internal-stage annular piece - Google Patents

Abstract

The invention relates to a radial and axial roll-forming method for a large internal-stage annular piece. The method comprises the following steps of: (1) making a blank, namely performing hot-forging, upsetting, punching and slug-stamping on a bar material, and thus obtaining an annular piece blank for rolling; (2) designing a roll hole pattern, namely determining the size of the roll hole pattern according to a roll linear speed, an equipment parameter, a roll deformation condition and the size of the annular piece blank, and determining the size of the axial roll hole pattern according to the roll linear speed, the equipment parameter, the annular piece blank and the size of the annular piece blank; and (3) roll-forming, namely putting the obtained annular piece blank on an annular rolling machine for rolling, controlling an upper conical roller and a lower conical roller to move backwards in real time during rolling to make the bottom end of the annular rolling machine always contact outer diameters of the upper end face and the lower end face of the annular piece, controlling the rolling process by rationally distributing a feeding speed and a feeding amount according to three stages, namely pre-rolling, rolling and shaping rolling, and when the outer diameter of the detected annular piece reaches a preset value, finishing the rolling process. The method has the characteristics of high production efficiency, low production cost and high product quality.

Description

The axially rolled manufacturing process in a kind of large-scale interior step ring footpath

Technical field

The present invention relates to a kind of machining process of large-scale workpiece, be specifically related to the axially rolled manufacturing process in a kind of large-scale interior step ring footpath.

Background technology

Diameter surpasses 1 meter and inner surface and has step ring in dark step large-scale, like engineering machinery rotating support ring, combustion turbine retaining ring, wind tower flange ring etc., has a wide range of applications in fields such as engineering machinery, boats and ships, wind-power electricity generation, petrochemical industry.This type of ring is to adopt to forge base, reaming again, the method processing of cut inner surface step then earlier at present mostly.Through the machine cut processing step, machining period consumption is big, stock utilization is low, and cut cut off the metallic fiber streamline, has reduced the ring mechanical performance, causes production efficiency low, and cost is high, poor product quality.

Summary of the invention

Technical problem to be solved by this invention provides the axially rolled manufacturing process in a kind of large-scale interior step ring footpath; This method can effectively reduce the material and the expenditure of time of step in the follow-up cut; And avoid the destruction of cut to the metallic fiber streamline, improve production efficiency and product quality.

For solving the problems of the technologies described above, the technical scheme that the present invention taked is:

The axially rolled manufacturing process in a kind of large-scale interior step ring footpath through continuous revolution plastic deformation, is realized the direct roll forming of ring inner surface step by means of axially rolled pass, it is characterized in that mainly comprising the steps:

(1) base:, process the rolling ring blank of using by setting size with bar forge hot, jumping-up, punching, punching the wad;

(2) rolling groove design: the rolling groove size confirms that according to roll line speed, device parameter, rolling deformation condition, ring blank dimension axially rolled pass size is confirmed by roll line speed, device parameter, ring blank and ring size;

(3) roll forming: the ring blank that makes is put machine for rolling ring be rolled; Controlling upper and lower awl roller in the operation of rolling in real time retreats; Its bottom is remained with the upper and lower end face outer radius of ring to be contacted; The operation of rolling is controlled by rolling, main rolling, the shaping rolling three phases reasonable distribution feed speed and the amount of feeding in advance, when survey ring external diameter reaches predetermined value, and operation of rolling end.

By technique scheme, above-mentioned steps is specially:

(1) base: confirm ring blank dimension; The bar section evenly is heated to the forge hot deformation temperature from room temperature,, processes the rolling ring blank of using then with hot material section jumping-up, punching, punching the wad on hydraulic press; Ring blank dimension is confirmed according to ring size, rolling ratio, radial and axial amount of feeding ratio;

(2) rolling groove design: comprise the design of radial rolling pass and axially rolled pass; Radial rolling pass design parameter comprises king roller and the core roller working face that is the face of cylinder, and the pass design size is confirmed according to roll line speed, device parameter, rolling deformation condition, ring blank dimension; Axially rolled pass design parameter comprises the working face of a pair of upper and lower cone-shaped roll, and the pass design size is confirmed by roll line speed, device parameter, ring blank and ring size;

(3) roll forming: the ring blank that makes is put the axial machine for rolling ring in footpath be rolled; The ring blank is placed horizontally between king roller and the core roller stepped hole is formed; The epicone roller is processed the horizontal upper end face of ring blank; Boring roller down processes the horizontal lower surface of ring blank; Surveying the upper and lower awl roller roller of the real-time control of ring external diameter value according to measuring roller in the operation of rolling retreats; Its bottom is remained with the upper and lower end face outer radius of ring to be contacted; The operation of rolling is by rolling, main rolling, the shaping rolling three phases reasonable distribution feed speed and the amount of feeding are controlled in advance; When survey ring external diameter reached predetermined value, the operation of rolling finished.

By technique scheme, ring blank dimension is confirmed as follows in the step (1):

1) calculates the ring volume

Ring volume V is calculated as follows

$V=\mathrm{\π}[B_b(R^2-r_b^2)+B_s(R^2-r_s^2)]$

Wherein, B _b, B _sBe respectively big bore portion of ring and aperture section axial height; r _b, r _sBe respectively ring macropore and little pore radius; R is the ring external diameter;

2) confirm rolling ratio

Rolling is ring blank sectional area A than λ ₀Be shaped after the ratio of ring sectional area A, promptly

$\mathrm{\λ}=\frac{A_0}{A}=\frac{H_0{B}_0}{H_b{B}_b+H_s{B}_s}$

Wherein, H ₀, B ₀Be ring blank wall thickness and axial height, H _b, H _sFor being respectively ring macropore and aperture part wall thickness, B _b, B _sFor being respectively ring macropore and aperture section axial height; For the non-rectangular cross-section ring rolling, if rolling than too small, then the ring cross section profile is not easy to be full of; Rolling than excessive, the rolling deformation condition then is difficult for satisfying, and the ring blank produces defectives such as tissue damage, crackle easily because of excessive deformation; Axially rolled for step ring footpath in large-scale, it is 2～4 more suitable that the λ value is taken as;

3) confirm radial and axial amount of feeding ratio

The ring blank is in the axially rolled process in footpath, and its radial thickness and axial height all reduce; For step ring footpath in the present invention axially rolled in, ring blank wall thickness promptly radially has material impact with axial feeding ratio η to step shaping degree in the ring with the reduction ratio of height; For guaranteeing that step can better be shaped in the ring, η can confirm by following formula:

$\mathrm{\η}=\frac{\mathrm{\Δh}}{\mathrm{\Δb}}=\frac{H_0-H_s}{B_0-B_s}=\frac{B_b+B_s}{H_s}$

Wherein, Δ h=H ₀-H _s, Δ b=B ₀-B _sBe respectively the radial and axial amount of feeding;

4) confirm ring blank dimension

According to plastic deformation constancy of volume principle, confirm that ring blank dimension does

$H_0=\frac{H_s^2-(B_b+B_s)B_s}{2H_s}+\sqrt{\frac{(B_b+B_s)\mathrm{\&lambda;}}{H_s}+\frac{(H_s^2-{(B_b{B}_s+B_s^2)}^2}{{4H}_{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000125475240000011.png,HDA0000125475240000032.png"\; state="\{\{state\}\}">s</figure-callout>}}^2}}$

${\mathrm{<figure-callout\; id="0"\; label="B"\; filenames="HDA0000125475240000032.png"\; state="\{\{state\}\}">B</figure-callout>}}_0=\frac{\mathrm{\&lambda;}(H_b{B}_b+H_s{B}_s)}{H_0},$ $R_0=\frac{V}{2\mathrm{\&pi;}{B}_0{H}_0}+\frac{H_0}{2},$ ${\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="HDA0000125475240000032.png"\; state="\{\{state\}\}">r</figure-callout>}}_0=\frac{V}{2\mathrm{\&pi;}{B}_0{H}_0}-\frac{H_0}{2}.$

By technique scheme, rolling groove designs as follows in the step (2):

1) radial rolling pass design

The radial rolling pass is made up of king roller that is the face of cylinder and core roller working face; King roller working face radius R _mCan confirm by following formula:

$R_m=\frac{V_m\mathrm{\&gamma;}}{2\mathrm{\&pi;n}}$

In the formula, V _mBe king roller roll line speed, be shaped V in order to guarantee the ring stable rolling _mUsually get 1.1～1.3m/s; N and γ are respectively equipment master motor speed and gearratio;

In order to guarantee that the ring blank is at radially pass generation continuous rolling distortion, king roller working face radius R _mWith core roller working face radius R _iShould satisfy following condition:

$\frac{1}{R_m}+\frac{1}{R_i}\&le;\frac{17.5\mathrm{\&beta;}}{{\mathrm{<figure-callout\; id="0"\; label="H"\; filenames="HDA0000125475240000032.png"\; state="\{\{state\}\}">H</figure-callout>}}_0}$

In the formula, β=arctan μ is an angle of friction, and μ is a coefficient of friction;

In addition, core roller working face radius R _iShould guarantee that the core roller can penetrate the ring blanking inner hole smoothly and be rolled, R is arranged usually _i≤r ₀-10; Can confirm that according to above-mentioned condition core roller working face radius span is:

$\frac{H_0{R}_m}{17.5\mathrm{\&beta;}{R}_m-{\mathrm{<figure-callout\; id="0"\; label="H"\; filenames="HDA0000125475240000032.png"\; state="\{\{state\}\}">H</figure-callout>}}_0}\&le;R_i\&le;r_0-10$

King roller working face axial height B _mWith core roller working face axial height B _iEqual ring blank axial height B ₀

2) axially rolled pass design

Axially rolled pass is made up of a pair of upper and lower cone-shaped roll; The epicone roll structure is double-deck stack taper, and the horizontal upper end face of ring blank is processed; Under to bore roller be the individual layer taper, the horizontal lower surface of ring blank is processed;

Epicone roller working face has the type groove step in the ring that is used for being shaped, and type groove size can be confirmed as according to the ring step dimension:

L ₂＝H _b，L ₃＝B _b

In order to guarantee stable rolling, epicone rolling system linear velocity is epicone roller and ring cylindrical contact position linear velocity, should be identical with king roller roll line speed; In the operation of rolling, epicone roller tapered bottom end remains with ring upper surface outer radius and contacts, and to guarantee the step forming dimension, then has:

2πR _uc n ₁/γ ₁＝V _m

In the formula, n ₁And γ ₁Be respectively epicone roller motor rotating speed and gearratio;

According to geometrical relationship, all the other are of a size of can to confirm epicone roller working face:

$R_{\mathrm{uc}}=\frac{V_m{\mathrm{\&gamma;}}_1}{{2\mathrm{\&pi;<figure-callout\; id="1"\; label="n"\; filenames="HDA0000125475240000032.png"\; state="\{\{state\}\}">n</figure-callout>}}_1},$ ${\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000125475240000032.png"\; state="\{\{state\}\}">L</figure-callout>}}_1=\frac{V_m{\mathrm{\&gamma;}}_1}{{2\mathrm{\&pi;<figure-callout\; id="1"\; label="n"\; filenames="HDA0000125475240000032.png"\; state="\{\{state\}\}">n</figure-callout>}}_1\sin (\mathrm{\&theta;}/2)}+{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="HDA0000125475240000011.png,HDA0000125475240000031.png"\; state="\{\{state\}\}">L</figure-callout>}}_3\mathrm{ctg}(\mathrm{\&theta;}/2)-{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA0000125475240000011.png,HDA0000125475240000032.png"\; state="\{\{state\}\}">L</figure-callout>}}_2$

R _uc1＝L ₁sin(θ/2)，R _uc2＝R _uc1-L ₂sin(θ/2)

In the formula, θ gets 35 ° usually for awl roller cone angle;

Under bore not banding pattern groove of roller working face, its maximum gauge is identical with epicone roller maximum gauge, and is consistent to guarantee upper and lower awl roller linear velocity, can confirm that then its working face is of a size of:

$R_{\mathrm{dc}}=R_{\mathrm{uc}},L=\frac{R_{\mathrm{uc}}}{\sin \mathrm{\&theta;}/2}.$

By technique scheme, in the process of roll forming, each stage feed speed and amount of feeding control parameter can be confirmed as follows in the step (3):

Radial feed speed: v _R1=(0.5～0.8) v _Rmin, v _R2=(2～4) v _Rmin, v _R3=(0.3～0.5) v _Rmin

Radial feeds: Δ H ₁=0.05 Δ H, Δ H ₂=0.85 Δ H, Δ H ₃=0.1 Δ H

Axial feed velocity: v _A1=(0.5～0.8) v _Amin, v _A2=(2～4) v _Amin, v _A3=(0.3～0.5) v _Amin

Axial feeding: Δ B ₁=0.05 Δ B, Δ B ₂=0.85 Δ B, Δ B ₃=0.1 Δ B

Wherein,

For making ring produce the needed smallest radial feed speed of rolling deformation; v _Amin=v _Rmin/ η produces the needed minimum axial feed speed of rolling deformation for making ring;

Δ H=H ₀-H _s, Δ B=B ₀-B _sBe respectively the radial and axial total feed amount of ring rolling.

The present invention adopts the large-scale interior step ring of the ring axially rolled manufacturing process roll forming in footpath; Through appropriate design ring blank, rolling groove and controlled rolling process; Realization is by the large-scale interior step ring of the direct roll forming of ring blank; Reduce the material and the expenditure of time of step in the follow-up machining, improved the ring metal streamline and distributed, improved production efficiency and product quality.

Description of drawings:

With each embodiment the present invention is done further explain below in conjunction with accompanying drawing.

Fig. 1 is the axially rolled shaping sketch map in large-scale interior step ring footpath of the present invention;

Among Fig. 1, the 1-king roller, 2-core roller, the 3-guide bars, 4-ring blank, 5-epicone roller, 6-be the awl roller down, the 7-measuring roller

Fig. 2 is the ring inner wall section figure that the present invention has been shaped

Fig. 3 is a ring blank sectional view of the present invention

Fig. 4 is radial rolling pass king roller face structure figure of the present invention

Fig. 5 is radial rolling pass core roller face structure figure of the present invention

Fig. 6 is axially rolled pass epicone roller face structure figure of the present invention

Fig. 7 is awl roller face structure figure under the axially rolled pass of the present invention

Fig. 8 is the rolling amount of feeding of radial feed direction of the present invention and feed speed control curve map

Fig. 9 is the rolling amount of feeding of axial feed direction of the present invention and feed speed control curve map.

The specific embodiment:

The manufacturing process real-time according to the present invention is as shown in Figure 1, adopts axially machine for rolling ring shaping large-scale interior step ring as shown in Figure 2 of footpath.

Ring blank 4 is placed horizontally between the king roller 1 and core roller 2 of the axial machine for rolling ring in footpath among Fig. 1, and both sides guide bars 3 leads to ring blank 4 from fore-and-aft direction; Epicone roller 5 is double-deck stack taper, and the horizontal upper end face of ring blank 4 is processed; Under bore roller 6 and be the individual layer taper, the horizontal lower surface of ring blank 4 is processed; Measuring roller 7 is measured it from the right side of ring blank 4 in real time.

The ring physical dimension that will be shaped shown in Figure 2 is: outer radius R is 2348mm, the macropore radius r _bBe 2008mm, the aperture radius r _sBe 1848mm, macropore axial height B _bBe 50mm, aperture axial height B _sBe 90mm.Its axially rolled manufacturing process in footpath is realized as follows:

1) base: the bar section evenly is heated to the forge hot deformation temperature from room temperature,, processes rolling with ring blank 4 then with hot material section jumping-up, punching, punching the wad on hydraulic press.

According to ring blank 4 size design methods, getting rolling is 3 than λ, confirms that ring blank 4 is of a size of: outer radius R ₀Be 527.76mm, inside radius r ₀Be 178.88mm, axial height B ₀Be 266.57mm.(shown in Figure 3).

2) rolling groove design:, get roll line speed V according to the rolling groove method for designing _dBe 1.3m/s, press the radial rolling of structural design shown in Figure 4 and 5 pass, king roller 1 working face radius R _mBe 500mm, core roller 2 working face radius Rs _iBe 150mm, king roller 1 working face axial height B _mWith core roller 2 working face axial height B _iBe 266.57mm.Press the axially rolled pass of structural design shown in Fig. 6 and 7 then, epicone roller 5 working face dimensional parameters are: L ₁Be 520.69mm, L ₂Be 170mm, L ₃Be 50mm, R _Uc1Be 156.57mm, R _Uc2Be 105.45mm, R _UcBe 160mm; Under bore roller 6 working face dimensional parameters and be: R _DcBe 160mm, L is 532.09mm.

3) roll forming: will put machine for rolling ring by the ring blank 4 that above-mentioned size makes and be rolled, and adjust upper and lower awl roller 5 and 6 horizontal levels, making separately, tapered bottom end contacts with the upper and lower end face outer radius of ring blank respectively.In the operation of rolling, according to the measuring roller 7 ring external diameter value of surveying in real time the upper and lower awl roller 5 and 6 of control retreat, tapered bottom end is remained with the upper and lower end face outer radius of ring contacts.The operation of rolling is controlled by rolling, main rolling, the rolling three phases of shaping in advance.

The radial and axial feed speed of each stage of the operation of rolling and the amount of feeding are controlled by curve shown in Fig. 8 and 9.Preparatory rolling sequence, radial and axial feed speed v _R1, v _A1Be respectively 0.82mm/s, 1.46mm/s, radial and axial amount of feeding Δ H ₁, Δ B ₁Be respectively 4.94mm, 8.83mm; Main rolling sequence, radial and axial feed speed v _R2, v _A2Be respectively 3.28mm/s, 5.86mm/s, radial and axial amount of feeding Δ H ₂, Δ B ₂Be respectively 84.05mm, 150.08mm; The shaping rolling sequence, radial and axial feed speed v _R3, v _A3Be respectively 0.49mm/s, 0.88mm/s, radial and axial amount of feeding Δ H ₃, Δ B ₃Be respectively 9.88mm, 17.66mm.When the measuring roller 7 ring external diameter of surveying reaches predetermined value, stop radial and axial feeding, the operation of rolling finishes.

Above disclosedly be merely preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, the equivalence of therefore doing according to claim of the present invention changes, and still belongs to protection scope of the present invention.

Claims (5)

1. the one kind large-scale axially rolled manufacturing process in interior step ring footpath through continuous revolution plastic deformation, is realized the direct roll forming of ring inner surface step by means of axially rolled pass, it is characterized in that mainly comprising the steps:

(1) base:, process the rolling ring blank of using by setting size with bar forge hot, jumping-up, punching, punching the wad;

(2) rolling groove design: the rolling groove size confirms that according to roll line speed, device parameter, rolling deformation condition, ring blank dimension axially rolled pass size is confirmed by roll line speed, device parameter, ring blank and ring size;

(3) roll forming: the ring blank that makes is put machine for rolling ring be rolled; Controlling upper and lower awl roller in the operation of rolling in real time retreats; Its bottom is remained with the upper and lower end face outer radius of ring to be contacted; The operation of rolling is controlled by rolling, main rolling, the shaping rolling three phases reasonable distribution feed speed and the amount of feeding in advance, when survey ring external diameter reaches predetermined value, and operation of rolling end.

2. manufacturing process according to claim 1 is characterized in that each step is specially:

(1) base: confirm ring blank dimension; The bar section evenly is heated to the forge hot deformation temperature from room temperature,, processes the rolling ring blank of using then with hot material section jumping-up, punching, punching the wad on hydraulic press; Ring blank dimension is confirmed according to ring size, rolling ratio, radial and axial amount of feeding ratio;

(2) rolling groove design: comprise the design of radial rolling pass and axially rolled pass; Radial rolling pass design parameter comprises king roller and the core roller working face that is the face of cylinder, and the pass design size is confirmed according to roll line speed, device parameter, rolling deformation condition, ring blank dimension; Axially rolled pass design parameter comprises the working face of a pair of upper and lower cone-shaped roll, and the pass design size is confirmed by roll line speed, device parameter, ring blank and ring size;

(3) roll forming: the ring blank that makes is put the axial machine for rolling ring in footpath be rolled; The ring blank is placed horizontally between king roller and the core roller stepped hole is formed; The epicone roller is processed the horizontal upper end face of ring blank; Boring roller down processes the horizontal lower surface of ring blank; Surveying the upper and lower awl roller roller of the real-time control of ring external diameter value according to measuring roller in the operation of rolling retreats; Its bottom is remained with the upper and lower end face outer radius of ring to be contacted; The operation of rolling is by rolling, main rolling, the shaping rolling three phases reasonable distribution feed speed and the amount of feeding are controlled in advance; When survey ring external diameter reached predetermined value, the operation of rolling finished.

3. manufacturing process according to claim 1 and 2 is characterized in that ring blank dimension is confirmed as follows in the step (1):

1) calculates the ring volume

Ring volume V is calculated as follows

$V=\mathrm{\&pi;}[B_b(R^2-r_b^2)+B_s(R^2-r_s^2)]$

Wherein, B _b, B _sBe respectively big bore portion of ring and aperture section axial height; r _b, r _sBe respectively ring macropore and little pore radius; R is the ring external diameter;

2) confirm rolling ratio

Rolling is ring blank sectional area A than λ ₀Be shaped after the ratio of ring sectional area A, promptly

$\mathrm{\&lambda;}=\frac{A_0}{A}=\frac{H_0{B}_0}{H_b{B}_b+H_s{B}_s}$

Wherein, H ₀, B ₀Be ring blank wall thickness and axial height, H _b, H _sFor being respectively ring macropore and aperture part wall thickness, B _b, B _sFor being respectively ring macropore and aperture section axial height; For the non-rectangular cross-section ring rolling, if rolling than too small, then the ring cross section profile is not easy to be full of; Rolling than excessive, the rolling deformation condition then is difficult for satisfying, and the ring blank produces defectives such as tissue damage, crackle easily because of excessive deformation; Axially rolled for step ring footpath in large-scale, it is 2～4 more suitable that the λ value is taken as;

3) confirm radial and axial amount of feeding ratio

The ring blank is in the axially rolled process in footpath, and its radial thickness and axial height all reduce; For step ring footpath in the present invention axially rolled in, ring blank wall thickness promptly radially has material impact with axial feeding ratio η to step shaping degree in the ring with the reduction ratio of height; For guaranteeing that step can better be shaped in the ring, η can confirm by following formula:

$\mathrm{\&eta;}=\frac{\mathrm{\&Delta;h}}{\mathrm{\&Delta;b}}=\frac{H_0-H_s}{B_0-B_s}=\frac{B_b+B_s}{H_s}$

Wherein, Δ h=H ₀-H _s, Δ b=B ₀-B _sBe respectively the radial and axial amount of feeding;

4) confirm ring blank dimension

According to plastic deformation constancy of volume principle, confirm that ring blank dimension does

$H_0=\frac{H_s^2-(B_b+B_s)B_s}{2H_s}+\sqrt{\frac{(B_b+B_s)\mathrm{\&lambda;}}{H_s}+\frac{(H_s^2-{(B_b{B}_s+B_s^2)}^2}{{4H}_s^2}}$

$B_0=\frac{\mathrm{\&lambda;}(H_b{B}_b+H_s{B}_s)}{H_0},$ $R_0=\frac{V}{2\mathrm{\&pi;}{B}_0{H}_0}+\frac{H_0}{2},$ $r_0=\frac{V}{2\mathrm{\&pi;}{B}_0{H}_0}-\frac{H_0}{2}.$

4. manufacturing process according to claim 1 and 2 is characterized in that rolling groove designs as follows in the step (2):

1) radial rolling pass design

The radial rolling pass is made up of king roller that is the face of cylinder and core roller working face; King roller working face radius R _mCan confirm by following formula:

$R_m=\frac{V_m\mathrm{\&gamma;}}{2\mathrm{\&pi;n}}$

In the formula, V _mBe king roller roll line speed, be shaped V in order to guarantee the ring stable rolling _mUsually get 1.1～1.3m/s; N and γ are respectively equipment master motor speed and gearratio;

In order to guarantee that the ring blank is at radially pass generation continuous rolling distortion, king roller working face radius R _mWith core roller working face radius R _iShould satisfy following condition:

$\frac{1}{R_m}+\frac{1}{R_i}\&le;\frac{17.5\mathrm{\&beta;}}{H_0}$

In the formula, β=arctan μ is an angle of friction, and μ is a coefficient of friction;

In addition, core roller working face radius R _iShould guarantee that the core roller can penetrate the ring blanking inner hole smoothly and be rolled, R is arranged usually _i≤r ₀-10; Can confirm that according to above-mentioned condition core roller working face radius span is:

$\frac{H_0{R}_m}{17.5\mathrm{\&beta;}{R}_m-H_0}\&le;R_i\&le;r_0-10$

King roller working face axial height B _mWith core roller working face axial height B _iEqual ring blank axial height B ₀

2) axially rolled pass design

Axially rolled pass is made up of a pair of upper and lower cone-shaped roll; The epicone roll structure is double-deck stack taper, and the horizontal upper end face of ring blank is processed; Under to bore roller be the individual layer taper, the horizontal lower surface of ring blank is processed;

Epicone roller working face has the type groove step in the ring that is used for being shaped, and type groove size can be confirmed as according to the ring step dimension:

L ₂＝H _b，L ₃＝B _b

In order to guarantee stable rolling, epicone rolling system linear velocity is epicone roller and ring cylindrical contact position linear velocity, should be identical with king roller roll line speed; In the operation of rolling, epicone roller tapered bottom end remains with ring upper surface outer radius and contacts, and to guarantee the step forming dimension, then has:

2πR _uc?n ₁/γ ₁＝V _m

In the formula, n ₁And γ ₁Be respectively epicone roller motor rotating speed and gearratio;

According to geometrical relationship, all the other are of a size of can to confirm epicone roller working face:

$R_{\mathrm{uc}}=\frac{V_m{\mathrm{\&gamma;}}_1}{{2\mathrm{\&pi;n}}_1},$ $L_1=\frac{V_m{\mathrm{\&gamma;}}_1}{{2\mathrm{\&pi;n}}_1\sin (\mathrm{\&theta;}/2)}+L_3\mathrm{ctg}(\mathrm{\&theta;}/2)-L_2$

R _uc1＝L ₁sin(θ/2)，R _uc2＝R _uc1-L ₂sin(θ/2)

In the formula, θ gets 35 ° usually for awl roller cone angle;

Under bore not banding pattern groove of roller working face, its maximum gauge is identical with epicone roller maximum gauge, and is consistent to guarantee upper and lower awl roller linear velocity, can confirm that then its working face is of a size of:

$R_{\mathrm{dc}}=R_{\mathrm{uc}},L=\frac{R_{\mathrm{uc}}}{\sin \mathrm{\&theta;}/2}.$

5. manufacturing process according to claim 1 and 2 is characterized in that in the process of roll forming in the step (3), and each stage feed speed and amount of feeding control parameter can be confirmed as follows:

Radial feed speed: v _R1=(0.5～0.8) v _Rmin, v _R2=(2～4) v _Rmin, v _R3=(0.3～0.5) v _Rmin

Radial feeds: Δ H ₁=0.05 Δ H, Δ H ₂=0.85 Δ H, Δ H ₃=0.1 Δ H

Axial feed velocity: v _A1=(0.5～0.8) v _Amin, v _A2=(2～4) v _Amin, v _A3=(0.3～0.5) v _Amin

Axial feeding: Δ B ₁=0.05 Δ B, Δ B ₂=0.85 Δ B, Δ B ₃=0.1 Δ B

Wherein,

For making ring produce the needed smallest radial feed speed of rolling deformation; v _Amin=v _Rmin/ η produces the needed minimum axial feed speed of rolling deformation for making ring;

Δ H=H ₀-H _s, Δ B=B ₀-B _sBe respectively the radial and axial total feed amount of ring rolling.

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