CN109746299B - Spherical spinning wheel-based equal-wall-thickness die-free spinning method for frustum-shaped thin-wall part - Google Patents
Spherical spinning wheel-based equal-wall-thickness die-free spinning method for frustum-shaped thin-wall part Download PDFInfo
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Abstract
A spherical spinning wheel-based equal-wall-thickness die-free spinning method for a truncated cone-shaped thin-wall part comprises the following steps: clamping the circular plate blank between a main shaft and a tail top of a numerical control spinning machine, wherein the axes of the circular plate blank, the main shaft and the tail top are superposed, a spherical spinning wheel, the circular plate blank, the main shaft and the tail top axis are positioned on the same horizontal plane, and the axis of the spherical spinning wheel is parallel to the main shaft; controlling the spherical spinning wheel to move along the Z axis to enable the spherical arc top to be in contact with the spinning surface of the circular plate blank, and finishing the Z-direction initial positioning of the spherical spinning wheel; controlling the spherical surface spinning wheel to move along the X axis to complete the X-direction initial positioning of the spherical surface spinning wheel; determining the coordinate of the final contact point on the spherical spinning wheel at the initial stage of spinning forming; determining the X-direction displacement and the Z-direction displacement of the final contact point on the spherical spinning wheel when the forming piece completes all deformation; inputting the determined related parameters into a system of the numerical control spinning machine; and starting the numerical control spinning machine, and executing a die-free spinning forming process according to a processing program generated by the system until the circular plate blank is processed into a cone frustum-shaped forming piece.
Description
Technical Field
The invention belongs to the technical field of metal plate spinning forming, and particularly relates to a spherical spinning wheel-based uniform-wall-thickness die-free spinning method for a truncated cone-shaped thin-wall part.
Background
Spinning forming is widely applied to the industrial fields of aviation, aerospace, automobiles and the like because of the characteristics of high efficiency, low cost, high material utilization rate and the like. Since the modern spinning technology comes into existence, scholars at home and abroad develop a lot of research work on the spinning forming of the conventional revolving body parts, and the accurate and stable forming theory of the circular section spinning process is developed after continuous improvement. With the development of science and technology, research on spinning forming technology and theory has been advanced into coreless die spinning forming, and when the coreless die is spun, a workpiece is suspended and is subjected to spinning pressure during forming, so that the wall thickness of the workpiece is usually reduced, and the reduction rate is extremely difficult to control.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a spherical spinning wheel-based method for the uniform wall thickness of a truncated cone-shaped thin-walled workpiece without a die, wherein the spherical spinning wheel is introduced for the first time, and spinning forming is carried out according to a specific path track of the spinning wheel, so that the wall thickness reduction of the workpiece caused by the die-free spinning can be effectively compensated, the wall thickness control of the die-free spinning is realized, the forming uniformity of a product is effectively improved, the manufacturing flexibility of the die-free spinning technology in the product pre-grinding and trial-making stages can be further exerted, and the application of the die-free spinning technology is powerfully promoted.
In order to achieve the purpose, the invention adopts the following technical scheme: a spherical spinning wheel-based constant-wall-thickness die-free spinning method for a truncated cone-shaped thin-wall part comprises the following steps:
the method comprises the following steps: selecting a numerical control spinning machine, clamping the circular plate blank between a main shaft and a tail top of the numerical control spinning machine, and ensuring that the axial center lines of the circular plate blank, the main shaft and the tail top are coincident;
step two: a self-made spherical spinning wheel is installed on the numerical control spinning machine, a round chamfer is machined at the radial edge of the spherical spinning wheel, and the round chamfer and the main spherical surface of the spherical spinning wheel are in smooth tangent transition; adjusting the height of the spherical surface rotating wheel to enable the axial center lines of the spherical surface rotating wheel, the circular plate blank, the main shaft and the tail top to be in the same horizontal plane, wherein the axial center line of the spherical surface rotating wheel is parallel to the axial center line of the main shaft;
step three: controlling the spherical spinning wheel to move along the Z axis until the spherical arc top of the spherical spinning wheel is contacted with the spinning surface of the circular plate blank, marking the contact point as a Z-direction initial positioning point of the spherical spinning wheel, and adopting a coordinate calculation formula of the Z-direction initial positioning point of the spherical spinning wheel as ZBCSR＝-t0In the formula, ZBCSRCoordinates of a Z-direction initial point positioning point of the spherical surface spinning wheel, t0The thickness of the circular slab;
step four: controlling the spherical spinning wheel to move along the X axis, recording the point with the maximum radial dimension of the spherical spinning wheel as an X-direction initial positioning point, and taking the coordinate calculation formula of the X-direction initial positioning point of the spherical spinning wheel as XBCSR＝rSWherein r isS＝(RS+δ)-(LB-rB) tan β, formula, XBCSRIs the X-direction initial positioning point coordinate of the spherical surface rotating wheel rSIs the vertical distance R between the X-direction starting location point of the spherical spinning wheel and the axial center line of the main shaftSIs the radius of the main axis, δIs the minimum clearance between the conical corner of the forming member and the outer surface of the main shaft, LBIs the axial thickness, r, of the spherical surface spinning wheelBRadius of the radial edge round chamfer of the spherical spinning wheel is β is the longitudinal section half cone angle of the formed piece, and then the calculated X isBCSRInputting the data into a system of a numerical control spinning machine;
step five: determining the final contact point of the spherical spinning wheel and the formed part when the spherical spinning wheel and the formed part are completely deformed, and calculating the coordinate of the final contact point of the spherical spinning wheel at the initial stage of spinning forming, wherein the calculation formula is LT＝RB-RB·sinβ+t0And rT＝RS+δ-LTTan β, in which LTIs the Z-direction coordinate, R, of the final contact point on the spherical surface spinning wheel in the initial stage of spinning formingBRadius of spherical spinning wheel, β longitudinal section half-cone angle of shaped piece, t0Is the thickness of a circular slab, rTIs the X-direction coordinate, R, of the final contact point on the spherical surface spinning wheel in the initial stage of spinning formingSThe radius of the main shaft is delta, and the delta is the minimum clearance between the conical surface turning point of the forming part and the outer surface of the main shaft; then calculating the obtained LTAnd rTInputting the data into a system of a numerical control spinning machine;
step six: determining the X-direction displacement and the Z-direction displacement of the final contact point on the spherical spinning wheel when the formed piece completes all deformation, wherein the calculation formula is MA-X＝RA-rTAnd MA-Z＝MA-XTan β, wherein MA-XFor X-directional displacement of the final contact point on the spherical spinning wheel when the forming member is fully deformed, RAThe vertical distance r between the final contact point on the spherical spinning wheel and the axial center line of the main shaft when the forming part completes the whole deformationTIs the X-direction coordinate, M, of the final contact point on the spherical surface spinning wheel in the initial stage of spinning formingA-ZThe Z-direction displacement of the final contact point on the spherical spinning wheel when the formed piece is completely deformed is shown as β, the half cone angle of the longitudinal section of the formed piece is shown as M, and the M obtained by calculation is usedA-XAnd MA-ZInputting the data into a system of a numerical control spinning machine;
step seven: and starting the numerical control spinning machine, and executing a die-free spinning forming process according to a processing program generated by the system until the circular plate blank is processed into a cone frustum-shaped forming piece.
The spherical spinning wheel is fixedly connected to the end of a rotating shaft, the spherical spinning wheel is overlapped with the axial center line of the rotating shaft, two groups of thrust bearings are sleeved on the rotating shaft, the thrust bearings are axially limited through nuts, the rotating shaft is connected with the spinning wheel mounting frame through the thrust bearings, and the spherical spinning wheel has a rotation degree of freedom on the spinning wheel mounting frame.
The invention has the beneficial effects that:
according to the invention, the spherical spinning wheel is introduced for the first time, and spinning forming is carried out according to the specific path track of the spinning wheel, so that the reduction of the wall thickness of the workpiece caused by the die-free spinning can be effectively compensated, the wall thickness control of the die-free spinning is realized, the forming uniformity of the product is effectively improved, the manufacturing flexibility of the die-free spinning technology in the product pre-grinding and trial-making stages can be further exerted, and the application of the die-free spinning technology is powerfully promoted.
Drawings
FIG. 1 is a schematic view of clamping a circular slab;
FIG. 2 is a schematic view of a circular slab spin forming process;
FIG. 3 is an enlarged view of portion I of FIG. 2;
FIG. 4 is a schematic structural view of a spherical roller;
in the figure, 1-main shaft, 2-tail top, 3-round plate blank, 4-spherical rotary wheel, 5-forming piece, 6-rotating shaft, 7-thrust bearing and 8-nut.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
In the embodiment, the model of the numerical control spinning machine is PS-CNCSXY-5, a Siemens numerical control system is arranged in the numerical control spinning machine, and the rotating speed of a main shaft 1 is set to be 200 r/min; the outer diameter of the circular plate blank 3 is 100mm, the plate thickness of the circular plate blank 3 is 2.05mm, the circular plate blank 3 is made of 6061-O aluminum alloy, the initial cross section circle radius of the forming piece 5 is 25mm, the axial depth of the forming piece 5 is 16mm, and the longitudinal section half cone angle of the forming piece 5 is 25 degrees.
A spherical spinning wheel-based constant-wall-thickness die-free spinning method for a truncated cone-shaped thin-wall part comprises the following steps:
the method comprises the following steps: selecting a numerical control spinning machine, clamping a circular plate blank 3 between a main shaft 1 and a tail top 2 of the numerical control spinning machine according to the figure 1, and ensuring that the axial center lines of the circular plate blank 3, the main shaft 1 and the tail top 2 are coincident;
step two: a self-made spherical spinning wheel 4 is installed on the numerical control spinning machine, a round chamfer is machined at the radial edge of the spherical spinning wheel 4, and smooth tangential transition is formed between the round chamfer and the main spherical surface of the spherical spinning wheel 4; the height of the spherical surface spinning wheel 4 is adjusted to enable the axial center lines of the spherical surface spinning wheel 4, the circular plate blank 3, the main shaft 1 and the tail top 2 to be in the same horizontal plane, and the axial center line of the spherical surface spinning wheel 4 is parallel to the axial center line of the main shaft 1;
step three: controlling the spherical spinning wheel 4 to move along the Z axis as shown in fig. 2 and 3 until the spherical arc top of the spherical spinning wheel 4 contacts with the spinning surface of the circular plate blank 3, marking the contact point as the Z-direction initial positioning point of the spherical spinning wheel 4, and calculating the coordinate formula of the Z-direction initial positioning point of the spherical spinning wheel 4 as ZBCSR＝-t0In the formula, ZBCSRCoordinates of a Z-direction initial point positioning point of the spherical surface spinning wheel 4, t0The thickness of the circular slab 3;
step four: controlling the spherical spinning wheel 4 to move along the X axis, as shown in FIGS. 2 and 3, and marking the point with the largest radial dimension of the spherical spinning wheel 4 as the X-direction initial positioning point, wherein the coordinate calculation formula of the X-direction initial positioning point of the spherical spinning wheel 4 is XBCSR＝rSWherein r isS＝(RS+δ)-(LB-rB) tan β, formula, XBCSRIs the X-direction initial positioning point coordinate r of the spherical surface rotating wheel 4SIs the vertical distance R between the X-direction initial positioning point of the spherical spinning wheel 4 and the axial central line of the main shaft 1SIs the radius of the main shaft 1, delta is the minimum clearance between the conical corner of the forming member 5 and the outer surface of the main shaft 1, LBIs the axial thickness, r, of the spherical surface spinning wheel 4BThe radius of the round chamfer at the radial edge of the spherical spinning wheel 4 is β which is the longitudinal section half cone angle of the forming piece 5, and then the calculation is carried out to obtainX of (2)BCSRInputting the data into a system of a numerical control spinning machine;
step five: as shown in fig. 2 and 3, the final contact point of the spherical spinning wheel 4 and the forming member 5 at the time of completing the complete deformation is determined, and the coordinates of the final contact point on the spherical spinning wheel 4 at the initial stage of the spinning forming are calculated by the formula LT＝RB-RB·sinβ+t0And rT＝RS+δ-LTTan β, in which LTIs the Z-direction coordinate, R, of the final contact point on the spherical surface spinning wheel 4 in the initial stage of spinning formingBRadius of the spherical roller 4, β longitudinal section half-cone angle of the shaped part 5, t0Is the thickness r of the circular slab 3TIs the X-direction coordinate, R, of the final contact point on the spherical surface spinning wheel 4 in the initial stage of spinning formingSThe radius of the main shaft 1 is delta, which is the minimum clearance between the conical surface inflection point of the forming piece 5 and the outer surface of the main shaft 1; then calculating the obtained LTAnd rTInputting the data into a system of a numerical control spinning machine;
step six: as shown in fig. 2 and 3, the X-direction displacement and the Z-direction displacement of the final contact point on the spherical spinning wheel 4 when the forming member 5 completes the complete deformation are determined, and the calculation formula is MA-X＝RA-rTAnd MA-Z＝MA-XTan β, wherein MA-XFor the X-displacement, R, of the final contact point on the spherical roller 4 when the forming member 5 has completed its full deformationAThe vertical distance r between the final contact point on the spherical spinning wheel 4 and the axial center line of the spindle 1 when the forming member 5 completes the complete deformationTIs the X-direction coordinate, M, of the final contact point on the spherical surface spinning wheel 4 in the initial stage of spinning formingA-ZThe Z-direction displacement of the final contact point on the spherical spinning wheel 4 when the forming member 5 is completely deformed is shown as β, the longitudinal section half cone angle of the forming member 5 is shown, and the calculated M is calculatedA-XAnd MA-ZInputting the data into a system of a numerical control spinning machine;
step seven: and starting the numerical control spinning machine, and executing a die-free spinning forming process according to a processing program generated by the system until the circular plate blank 3 is processed into the conical frustum-shaped forming piece 5, wherein the wall thickness range of the forming piece 5 is measured to be 2.15-2.40 mm, the wall thickness tolerance range is within 0.25mm, and the requirement of equal wall thickness tolerance is completely met.
As shown in fig. 4, the spherical spinning wheel 4 is fixedly connected to the end of a rotating shaft 6, the spherical spinning wheel 4 coincides with the axial center line of the rotating shaft 6, two sets of thrust bearings 7 are sleeved on the rotating shaft 6, the thrust bearings 7 are axially limited through nuts 8, the rotating shaft 6 is connected with a spinning wheel mounting frame through the thrust bearings 7, and the spherical spinning wheel 4 has a rotation degree of freedom on the spinning wheel mounting frame.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. A spherical spinning wheel-based constant-wall-thickness die-free spinning method for a truncated cone-shaped thin-wall part is characterized by comprising the following steps of:
the method comprises the following steps: selecting a numerical control spinning machine, clamping the circular plate blank between a main shaft and a tail top of the numerical control spinning machine, and ensuring that the axial center lines of the circular plate blank, the main shaft and the tail top are coincident;
step two: a self-made spherical spinning wheel is installed on the numerical control spinning machine, a round chamfer is machined at the radial edge of the spherical spinning wheel, and the round chamfer and the main spherical surface of the spherical spinning wheel are in smooth tangent transition; adjusting the height of the spherical surface rotating wheel to enable the axial center lines of the spherical surface rotating wheel, the circular plate blank, the main shaft and the tail top to be in the same horizontal plane, wherein the axial center line of the spherical surface rotating wheel is parallel to the axial center line of the main shaft;
step three: controlling the spherical spinning wheel to move along the Z axis until the spherical arc top of the spherical spinning wheel is contacted with the spinning surface of the circular plate blank, marking the contact point as a Z-direction initial positioning point of the spherical spinning wheel, and adopting a coordinate calculation formula of the Z-direction initial positioning point of the spherical spinning wheel as ZBCSR＝-t0In the formula, ZBCSRIs the Z-direction initial positioning point coordinate of the spherical surface spinning wheel, t0The thickness of the circular slab;
step four: controlling the spherical spinning wheel to move along the X axis, recording the maximum radial size point of the spherical spinning wheel as an X-direction initial positioning point, and recording the X-direction initial positioning pointThe coordinate calculation formula of the X-direction initial positioning point is XBCSR＝rSWherein r isS＝(RS+δ)-(LB-rB) tan β, formula, XBCSRIs the X-direction initial positioning point coordinate of the spherical surface rotating wheel rSIs the vertical distance R between the X-direction starting location point of the spherical spinning wheel and the axial center line of the main shaftSIs the radius of the main shaft, delta is the minimum clearance between the conical corner of the forming part and the outer surface of the main shaft, LBIs the axial thickness, r, of the spherical surface spinning wheelBRadius of the radial edge round chamfer of the spherical spinning wheel is β is the longitudinal section half cone angle of the formed piece, and then the calculated X isBCSRInputting the data into a system of a numerical control spinning machine;
step five: determining the final contact point of the spherical spinning wheel and the formed part when the spherical spinning wheel and the formed part are completely deformed, and calculating the coordinate of the final contact point of the spherical spinning wheel at the initial stage of spinning forming, wherein the calculation formula is LT＝RB-RB·sinβ+t0And rT＝RS+δ-LTTan β, in which LTIs the Z-direction coordinate, R, of the final contact point on the spherical surface spinning wheel in the initial stage of spinning formingBRadius of spherical spinning wheel, β longitudinal section half-cone angle of shaped piece, t0Is the thickness of a circular slab, rTIs the X-direction coordinate, R, of the final contact point on the spherical surface spinning wheel in the initial stage of spinning formingSThe radius of the main shaft is delta, and the delta is the minimum clearance between the conical surface turning point of the forming part and the outer surface of the main shaft; then calculating the obtained LTAnd rTInputting the data into a system of a numerical control spinning machine;
step six: determining the X-direction displacement and the Z-direction displacement of the final contact point on the spherical spinning wheel when the formed piece completes all deformation, wherein the calculation formula is MA-X＝RA-rTAnd MA-Z＝MA-XTan β, wherein MA-XFor X-directional displacement of the final contact point on the spherical spinning wheel when the forming member is fully deformed, RAThe vertical distance r between the final contact point on the spherical spinning wheel and the axial center line of the main shaft when the forming part completes the whole deformationTFor final contact point on spherical spinning wheel at initial stage of spinningX-direction coordinate, MA-ZThe Z-direction displacement of the final contact point on the spherical spinning wheel when the formed piece is completely deformed is shown as β, the half cone angle of the longitudinal section of the formed piece is shown as M, and the M obtained by calculation is usedA-XAnd MA-ZInputting the data into a system of a numerical control spinning machine;
step seven: and starting the numerical control spinning machine, and executing a die-free spinning forming process according to a processing program generated by the system until the circular plate blank is processed into a cone frustum-shaped forming piece.
2. The constant-wall-thickness die-free spinning method of the truncated cone-shaped thin-walled workpiece based on the spherical spinning wheel as claimed in claim 1, wherein: the spherical spinning wheel is fixedly connected to the end of a rotating shaft, the spherical spinning wheel is overlapped with the axial center line of the rotating shaft, two groups of thrust bearings are sleeved on the rotating shaft, the thrust bearings are axially limited through nuts, the rotating shaft is connected with the spinning wheel mounting frame through the thrust bearings, and the spherical spinning wheel has a rotation degree of freedom on the spinning wheel mounting frame.
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| CN110918748B (en) * | 2019-09-30 | 2021-09-24 | 西北工业大学 | Design method of ordinary spinning wheel path based on wrinkling defect consideration |
| CN111069392A (en) * | 2019-12-20 | 2020-04-28 | 傲垦数控装备(苏州)有限公司 | Coreless die spinning process of fan accessory |
| CN112570488B (en) * | 2020-12-21 | 2022-06-10 | 燕山大学 | Spinning-reducing forming method of stepped pipe blank for small and medium-sized bulging forming automobile axle housing |
| CN112958682B (en) * | 2021-02-20 | 2022-07-08 | 沈阳航空航天大学 | Near-equal-thickness die-free spinning method for convex bus revolving body thin-walled part |
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| DE2816545A1 (en) * | 1978-04-17 | 1979-10-18 | Bernhard Rolf | Spin formed large spherical vessel - has forming roller mounted on swinging arm at centre of hemisphere during rotation in spinning lathe |
| CN201644627U (en) * | 2010-03-19 | 2010-11-24 | 西北工业大学 | Mouldless progressive forming tool |
| CN106424287A (en) * | 2016-12-22 | 2017-02-22 | 中南大学 | Stepwise precise spin-forming process method for large thin-wall dome |
| CN106984685A (en) * | 2017-05-29 | 2017-07-28 | 中南大学 | Large thin-wall spherical seal head without mould substep spin forming method |
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