CN106238549A - The surface of revolution part spin-on process on limit is installed before and after a kind of band - Google Patents

Abstract

The present invention installs the surface of revolution part spin-on process on limit before and after disclosing a kind of band, step one, by front for forging Vehicle Processing to rotation size；Step 2, interlude is carried out spinning, big for part end back side car is become step surface, remove mould tire end face step simultaneously, make that the back side, limit is installed greatly and fit with mould tire end face, keep axis of workpiece parallel with mould tire axis；Chamfering at part small end outer circular edge；Step 3, with spinning face for Vehicle Processing benchmark, non-spinning section is carried out finish turning processing；Spinning elongation is made to be stablized by controlling wall thickness reduction amount；Tested by theory analysis and spinning, it is determined that the shape face structure of spinning block tire and positioning compression mode, make spinning elongation change along the direction required, thus prevent shape area distortion；Breach the traditional thought that part processing positions by large and small end, start the new approaches with curved surface as machining benchmark, it is achieved that the coordinating and unifying between spinning shape face and machining surface.

Description

The surface of revolution part spin-on process on limit is installed before and after a kind of band

[technical field]

The invention belongs to Field of Aviation Manufacturing, belong to machining category, the revolution installing limit before and after relating to a kind of band is bent Surface parts spin-on process.

[background technology]

Aeroengine combustor buring room casing inner sleeve main part is welded through electron beam by forward and backward two sections, two sections of hairs Base is all GH141 forging.Design requires inner sleeve leading portion mid portion is carried out spinning strengthening, to improve intensity, hardness and to resist tired Labor performance.

Due to particularity and the inhomogeneities of rotary pressure deformation of design of part, inner sleeve leading portion rotary pressure deformation amount is very big, causes The deformation of non-spinning section is the biggest.Owing to lacking forging blank spinning experience and the technical data provided a reference, former technique does not has Getting the rotary pressure deformation feature of this structure clear, spinning quality is the most unstable, frequently occurs that spinning section ruptures, chap in spinning face, wall Thick overproof, and the series of problems such as bias, ellipse, spinning face axile displacement, the most also occur because of inner sleeve leading portion rotary pressure deformation The assembly caused greatly is overproof or scraps, and mass loss is the biggest.

1) shear spinning of GH141 forging, in China's aero-engine manufacturing industry or a new problem, in the past its Its unit, when processing this part, respectively in operations such as forging, machining, heat treatment, shear spinnings, the most all occurs Cross seminess.

2) part dimension head bias is an another difficult problem for current spinning, cause after part combination cannot Combined machining, even Assembly is caused to scrap, such as Fig. 1 and Fig. 2.

3) shape surface profile is poor

Design drawing requires that spinning surface profile is 0.5mm, and actual minimum clearance is 0, and maximal clearance is 3mm, and part is overproof Use.

4) spinning elongation changes greatly, it is impossible to control inside and outside installation limit allowance distribution

The forward and backward wall thickness of spinning is the most qualified, but spinning elongation differs greatly, actual difference 2-6mm, little after causing spinning Front, end flanges limit or reverse side Vehicle Processing surplus are not enough.

[summary of the invention]

The surface of revolution part spin-on process on limit is installed before and after present invention aim at proposing a kind of band, solves inner sleeve spinning The problems such as crackle, machined surface profile degree be big and spinning elongation is unstable, it is achieved the processing request of spare part.

The present invention is to be realized by following technical scheme:

The surface of revolution part spin-on process on limit is installed before and after a kind of band, comprises the following steps:

Step one, by forging Vehicle Processing to rotation before size

Known supination length, supination wall thickness, supination arc radius and rotation anterior wall thickness, calculate length before rotation；Rotation before regulation rotation Pressure section is shaped as circular arc, gives arc radius before revolving, and before rotation, length is equal to supination length and deducts spinning elongation, indulging of spinning section Section is circular curve, uses calculus methods to solve the volume of circular arc camber revolving body, and circular arc camber revolving body volume calculates Formula is as follows:

$V={\∫}_{x_1}^{x_2}\mathrm{\π}\[y^2-{(b/cos\mathrm{\α})}^2\]dx$

Wherein:

$y=y_0+\sqrt{R^2-{(x-x_0)}^2}$

α=tan^-1[(x-x₀)/(y-y₀)]

In formula: x is the abscissa of any on circular arc, y is the vertical coordinate of a bit, x on circular arc₀Horizontal seat for the circular arc center of circle Mark, y_oFor the vertical coordinate in the circular arc center of circle, R is arc radius, and b is curved surface wall thickness, and α is a little to the line in the circular arc center of circle on circular arc With the angle of y-axis, x₁For the abscissa of circular arc starting point, x₂Abscissa for circular arc terminal；

Before rotation, the computing formula of supination volume as follows:

Before rotation, spinning segment body amasss:

Wherein:

α=tan^-1[(x-x₀₁)/(y-y₀₁)]

In formula: x is the abscissa of any on the front circular arc of rotation, y is the vertical coordinate of a bit, x on the front circular arc of rotation₀₁For circular arc before rotation The abscissa in the center of circle, y_o1For the vertical coordinate in the circular arc center of circle, R before rotation₁For arc radius, b before rotation₁For rotation front curve wall thickness, α is rotation A little to line and the angle of y-axis, the x in the circular arc center of circle on front circular arc₁For the abscissa of supination circular arc starting point, x₂For circular arc before rotation The abscissa of terminal, h is spinning elongation；

Center coordinate of arc x before rotation₀₁And y₀₁Solve by following equations group:

(x₁+h-x₀₁)²+(y₁-y₀₁)²=R₁ ²

(x₂-x₀₁)²+(y₂-y₀₁)²=R₁ ²

Supination spinning segment body amasss:

Wherein:

α=tan^-1[(x-x₀₂)/(y-y₀₂)]

The most constant law establishes an equation: V_{Before rotation}=V_Supination

In formula: x is the abscissa of any on supination circular arc, y is the vertical coordinate of a bit, x on supination circular arc₀₂For supination circular arc The abscissa in the center of circle, y_o2For the vertical coordinate in the supination circular arc center of circle, R₂For supination arc radius, b₂For supination curved surface wall thickness, α is rotation A little to line and the angle of y-axis, the x in the circular arc center of circle on front circular arc₁For the abscissa of supination circular arc starting point, x₂For supination circular arc The abscissa of terminal；

Use the little step-length of spinning elongation to be incremented by approximatioss and solve given wall thickness reduction amount Δ_b=b₂-b₁Corresponding rotation Pressure elongation h；

According to above-mentioned parameter by size before forging Vehicle Processing to rotation；

Step 2, interlude is carried out spinning

Big for part end back side car is become step surface, removes mould tire end face step simultaneously, make the back side, limit and mould tire end are installed greatly Fitting in face, keeps axis of workpiece parallel with mould tire axis；Chamfering at part small end outer circular edge, uses ring big installation at limit Shape pressing plate pressure and tight bolt are fixed installing greatly limit with mould tire；

The method using shunting time spinning, every spinning one section, make spinning roller tangentially exiting along this segment endpoint；

Step 3, with spinning face for Vehicle Processing benchmark, non-spinning section is carried out finish turning processing.

Further, when interlude is carried out spinning, spinning section is divided into 4 sections of spinning.

Further, described step 2, chamfering 30 ° at part small end outer circular edge.

Present invention have the advantage that

1) use calculus methods, be programmed calculating by high-level language, have found spinning elongation and wall thickness reduction Relation between amount, under this relation instructs, makes spinning elongation be stablized by controlling wall thickness reduction amount.

2) broken conventional a time spinning theory, by shunting time spinning, reduced the extension resistance of material, solve The breakage problem that spinning drag is excessive and causes, improves shape face quality.

3) tested by theory analysis and spinning, it is determined that the shape face structure of spinning block tire and positioning compression mode, make rotation Pressure stretch length is along the direction change required, thus prevents shape area distortion.

4) breach the part processing traditional thought by large and small end location, start one with curved surface as machining benchmark New approaches, it is achieved that the coordinating and unifying between spinning shape face and machining surface.

The present invention can be used for the processing of aeroengine combustor buring room casing inner sleeve leading portion spinning profile.It is also applied for space flight to send out Motivation and other industry have the processing of the spinning part of similar structures requirement.

[accompanying drawing explanation]

Fig. 1 cuts outward turning pressure surface situation

Fig. 2 cuts inward turning pressure surface situation

Fig. 3 wall thickness reduction extends with spinning

Fig. 4 circular curve revolving body volume schematic diagram calculation

Fig. 5 spinning forward and backward spinning section shape and size change

Fig. 6 shunting time spinning

Fig. 7 big end positioning compression mode

Fig. 8 part and mould tire population structure

Fig. 9 is with spinning face for Vehicle Processing benchmark

[detailed description of the invention]

With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings:

The surface of revolution part spin-on process installing limit before and after band of the present invention specifically comprises the following steps that

First by size before forging Vehicle Processing to rotation, then interlude is carried out spinning, afterwards non-spinning section is carried out finish turning Process.

Part spinning is a kind of flow turning.According to Volume conservation law, shape and the chi of part to be ensured after spinning Very little, it is necessary for getting clear spinning section wall thickness reduction and shape, diameter and the Changing Pattern of length, and then determines the shape of blank before spinning Shape and size.

As it is shown on figure 3, wall thickness reduction extends with spinning.

Known supination length, supination wall thickness and supination arc radius, design is again given rotation anterior wall thickness, in addition it is also necessary to determine rotation Two sizes of length before front arc radius and rotation.For Simplified flowsheet and convenient calculating, it is stipulated that before rotation, spinning section shape remains The concrete numerical value of arc radius before circular arc, and given rotation, thus before surplus next one rotation, length dimension needs to solve.Cause For, length=supination length-spinning elongation before rotation, and spinning elongation is caused by wall thickness reduction, as long as so finding out rotation Variation relation between pressure elongation and wall thickness reduction amount, it is possible to try to achieve spinning elongation.

The vertical section of spinning section is circular curve, and circular curve revolving body volume schematic diagram calculation as shown in Figure 4, uses micro- Integration method solves the volume of circular arc camber revolving body, show that volume computing formula is as follows after deriving:

$V={\∫}_{x_1}^{x_2}\mathrm{\π}\[y^2-{(b/cos\mathrm{\α})}^2\]dx$

Wherein:

$y=y_0+\sqrt{R^2-{(x-x_0)}^2}$

α=tan^-1[(x-x₀)/(y-y₀)]

After defining spinning Duan Xuanqian, supination physical dimension symbol respectively by Fig. 4, before listing rotation, the calculating of supination volume Formula is as follows:

Before rotation, spinning segment body amasss:

Wherein:

α=tan^-1[(x-x₀₁)/(y-y₀₁)] here, the front center coordinate of arc x of rotation₀₁And y₀₁It is variable, by following equations Group solves:

(x₁+h-x₀₁)²+(y₁-y₀₁)²=R₁ ²

(x₂-x₀₁)²+(y₂-y₀₁)²=R₁ ²

Supination spinning segment body amasss:

Wherein:

α=tan^-1[(x-x₀₂)/(y-y₀₂)]

The most constant law establishes an equation: V_{Before rotation}=V_Supination

Use the Programming with Pascal Language such as FORTRON, and use the little step-length of spinning elongation to be incremented by approximatioss to solve, it is possible to calculate Go out given wall thickness reduction amount Δ_b=b₂-b₁Corresponding spinning elongation h.

Pressing wall thickness intermediate value selected rotation anterior wall thickness 2.4mm, supination wall thickness 2.05mm, calculated spinning elongation is 12mm.Supination length deducts 12mm just can draw blank length before rotation.Fig. 5 is that spinning forward and backward spinning section shape and size become Change.

4, shunting time spinning

As shown in Figure 6, using inward turning scheme, part spinning section aft terminal can not produce displacement, fits with core all the time, and Part spinning section forward terminal can only produce axial displacement, gradually close to core, until fitting completely with core.Want in order to above-mentioned Ask, the method using shunting time spinning, spinning section is divided into 4 sections, every spinning one section, make spinning roller tangentially moving back along this segment endpoint Go out.During exiting, rotating part wall thickness is the most thinning, but spinning roller still applies pressure to spinning section, makes spinning section shape change, and Promotion small end moves axially.

5, part positioning compression mode on spinning block tire

Part big end back side car becomes step surface, removes mould tire end face step simultaneously, makes to install greatly the back side, limit and mould tire end face Laminating, keeps axis of workpiece parallel with mould tire axis.The most also make to compress reliable, prevent spinning from returning heap and to holding greatly extension, Advantageously ensure that the surface accuracy at the switching of big end.

Fig. 7 big end positioning compression mode

As it is shown in fig. 7, the frictional resistance reduced between small end cylindrical and inward turning mould tire, small end deformation in spinning process, peace Rim turns up, and cylindrical contacts friction with mould tire endoporus, makes spinning elongation resistance increase.In order to reduce elongation resistance, and make part Dismounting is easy, chamfering 1 × 30 ° at part small end outer circular edge.On the other hand, for the big installation stoping counter-rotary-ing phenomenon to cause Limit displacement, increases the big thrust installing limit, uses thicker annular pressing plate and more hold-down bolt big installation at limit.As Fig. 8 is part and mould tire population structure.

7 Vehicle Processing selection of reference frames

As it is shown in figure 9, with spinning face for Vehicle Processing benchmark, after spinning, part is oval, all there is warpage and become in large and small end face Shape, and the axis out of plumb in spinning shape face, so the machining benchmark after spinning can not with the end face on forward and backward installation limit and endoporus, Excircle orientation, be with spinning face as positioning datum.Therefore, the locating surface of turning attachment sets according to the physical dimension of inward turning mould tire Meter, the positioning states of outward turning pressure surface is just as part is in inward turning mould tire, and the laminating of benchmark is effective, and positioning stablity is reliable. This location mode ensures the large end face of Vehicle Processing and the perpendicularity of spinning shape over glaze line to greatest extent, can effectively eliminate inclined head Phenomenon.

The economic benefit of this technology:

Combustion box inner sleeve is the load part on electromotor, spinning strengthening can improve the intensity of part, hardness and Anti-fatigue performance, the breakthrough of this technology, the end, eliminates the spare part caused because spinning process is unstable and scraps phenomenon.

Before improving, part scrap rate is 4.3%, and after improvement, percent defective is 0, if based on producing 100 per year, the whole year can save latent Economic loss: (4.3%-0%) × 100 × 230815.93=99 ten thousand yuan.

Specific implementation method:

1 technological process

Operation 5: spinning

Operation 10: car benchmark

Operation 15: car microcephaly installs limit

Operation 20: car major part installs limit

2 courses of processing

◆ operation 5: spinning

1. clamping spinning clamp, centering center, then compress.

2. clamping parts, compresses with cover plate.

3. clamping adjust roller.

4. program spinning is started.

5. part is dismantled.

◆ operation 10: car benchmark

1. clamping turning attachment, centering, compress.

2. position with part spinning profile, compressing component.

3. Vehicle Processing part big installation limit end face.

4. part is dismantled.

◆ operation 15: car microcephaly installs limit

1. clamping parts is on lathe.

2. level symmetrical 4 points in centering spinning face, compressing component.3. Vehicle Processing part little installation limit end face and cylindrical.

4. part is dismantled

◆ operation 20: car major part installs limit

1. clamping parts is on lathe.

2. little installation limit cylindrical, compressing component are looked for

3. Vehicle Processing big installation limit end face and cylindrical.

4. part is dismantled.

Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert The detailed description of the invention of the present invention is only limitted to this, for general technical staff of the technical field of the invention, is not taking off On the premise of present inventive concept, it is also possible to make some simple deduction or replace, all should be considered as belonging to the present invention by institute The claims submitted to determine scope of patent protection.

Claims (3)

1. the surface of revolution part spin-on process on limit is installed, it is characterised in that comprise the following steps before and after a band:

Step one, by forging Vehicle Processing to rotation before size

Known supination length, supination wall thickness, supination arc radius and rotation anterior wall thickness, calculate length before rotation；Spinning section before regulation rotation Being shaped as circular arc, arc radius before given rotation, before rotation, length deducts spinning elongation, the vertical section of spinning section equal to supination length For circular curve, calculus methods is used to solve the volume of circular arc camber revolving body, circular arc camber revolving body volume computing formula As follows:

$V={\∫}_{x_1}^{x_2}\mathrm{\π}\[y^2-{(b/cos\mathrm{\α})}^2\]dx$

Wherein:

α=tan^-1[(x-x₀)/(y-y₀)]

In formula: x is the abscissa of any on circular arc, y is the vertical coordinate of a bit, x on circular arc₀For the abscissa in the circular arc center of circle, y_oFor The vertical coordinate in the circular arc center of circle, R is arc radius, and b is curved surface wall thickness, and α is a little to line and the y-axis in the circular arc center of circle on circular arc Angle, x₁For the abscissa of circular arc starting point, x₂Abscissa for circular arc terminal；

Before rotation, the computing formula of supination volume as follows:

Before rotation, spinning segment body amasss:

Wherein:

α=tan^-1[(x-x₀₁)/(y-y₀₁)]

In formula: x is the abscissa of any on the front circular arc of rotation, y is the vertical coordinate of a bit, x on the front circular arc of rotation₀₁For the circular arc center of circle before rotation Abscissa, y_o1For the vertical coordinate in the circular arc center of circle, R before rotation₁For arc radius, b before rotation₁For rotation front curve wall thickness, α is circle before rotation A little to line and the angle of y-axis, the x in the circular arc center of circle on arc₁For the abscissa of supination circular arc starting point, x₂For circular arc terminal before rotation Abscissa, h is spinning elongation；

Center coordinate of arc x before rotation₀₁And y₀₁Solve by following equations group:

(x₁+h-x₀₁)²+(y₁-y₀₁)²=R₁ ²

(x₂-x₀₁)²+(y₂-y₀₁)²=R₁ ²

Supination spinning segment body amasss:

Wherein:

α=tan^-1[(x-x₀₂)/(y-y₀₂)]

The most constant law establishes an equation: V_{Before rotation}=V_Supination

In formula: x is the abscissa of any on supination circular arc, y is the vertical coordinate of a bit, x on supination circular arc₀₂For the supination circular arc center of circle Abscissa, y_o2For the vertical coordinate in the supination circular arc center of circle, R₂For supination arc radius, b₂For supination curved surface wall thickness, α is circle before rotation A little to line and the angle of y-axis, the x in the circular arc center of circle on arc₁For the abscissa of supination circular arc starting point, x₂For supination circular arc terminal Abscissa；

Use the little step-length of spinning elongation to be incremented by approximatioss and solve given wall thickness reduction amount Δ_b=b₂-b₁Corresponding spinning is stretched Long amount h；

According to above-mentioned parameter by size before forging Vehicle Processing to rotation；

Step 2, interlude is carried out spinning

Big for part end back side car is become step surface, removes mould tire end face step simultaneously, make that the back side, limit is installed greatly and paste with mould tire end face Close, keep axis of workpiece parallel with mould tire axis；Chamfering at part small end outer circular edge, uses annular pressure big installation at limit Plate pressure and tight bolt are fixed installing greatly limit with mould tire；

The method using shunting time spinning, every spinning one section, make spinning roller tangentially exiting along this segment endpoint；

Step 3, with spinning face for Vehicle Processing benchmark, non-spinning section is carried out finish turning processing.

The surface of revolution part spin-on process on limit is installed before and after band the most according to claim 1, it is characterised in that: to centre During Duan Jinhang spinning, spinning section is divided into 4 sections of spinning.

The surface of revolution part spin-on process on limit is installed before and after band the most according to claim 1, it is characterised in that: described step Rapid two, chamfering 30 ° at part small end outer circular edge.