CN112620460B - Force balance control method of three-spinning-wheel numerical control spinning machine - Google Patents

Force balance control method of three-spinning-wheel numerical control spinning machine Download PDF

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Publication number
CN112620460B
CN112620460B CN202011416470.8A CN202011416470A CN112620460B CN 112620460 B CN112620460 B CN 112620460B CN 202011416470 A CN202011416470 A CN 202011416470A CN 112620460 B CN112620460 B CN 112620460B
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spinning
wheel
rotating wheel
pressing
roller
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CN112620460A (en
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汪宇羿
张月倩
马世成
王东坡
赵文龙
孙昂
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Aerospace Research Institute of Materials and Processing Technology
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Aerospace Research Institute of Materials and Processing Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F

Abstract

The invention provides a force balance control method of a three-spinning-wheel numerical control spinning machine. A force balance control method of a three-spinning-wheel numerical control spinning machine comprises the steps of setting the total pressing amount of spinning wheels, the initial pressing position and the offset distance between the spinning wheels; and correcting the pressing amount of the first spinning wheel, the second spinning wheel or the third spinning wheel for the first time according to the acquired pressure data and standard pressure values of the first spinning wheel, the second spinning wheel and the third spinning wheel, wherein the sum of the pressing amounts of the first spinning wheel, the second spinning wheel and the third spinning wheel is unchanged in the correction process. The invention can solve the problem of controlling the balance of the transverse force of the three spinning wheels in the staggered spinning process, and the invention achieves the aim of controlling the balance of the transverse force of the three spinning wheels step by actively adjusting the rolling reduction of the first spinning wheel, the second spinning wheel or the third spinning wheel, calculating by a numerical control system and automatically adjusting the radial displacement variable of the three spinning wheels.

Description

Force balance control method of three-spinning-wheel numerical control spinning machine
Technical Field
The invention relates to the technical field of metal pipe pressure processing, in particular to a force balance control method of a three-spinning-wheel numerical control spinning machine.
Background
The spinning forming technology is a pressure processing technology which utilizes approximate point contact and unit high pressure of a spinning wheel and a workpiece to enable a processed material to generate plastic deformation locally, and the forming technology has the characteristics of high material utilization rate, obviously improved processing performance, suitability for processing high-strength materials difficult to deform, integral processing of seamless revolving body hollow parts and the like. The spinning method has the characteristics of large spinning tonnage, automatic centering of the spinning roller, high spinning precision and the like, and is widely applied to spinning and forming of thin-wall cylindrical parts, external circumferential reinforcing ribs and small-cone-angle parts.
The transverse three-spinning-wheel force balance technology is always the target pursued by the spinning forming technology, and if the spinning pressure automatic detection and feedback functions can be realized, innovation is brought to the spinning forming technology, the precision of a spinning workpiece can be greatly improved, the service life of spinning equipment can be greatly prolonged, and the like. At present, the existing three-spinning-wheel power spinning forming technology cannot realize the automatic detection and feedback functions of the spinning force.
Disclosure of Invention
The invention aims to provide a force balance control method of a three-spinning-wheel numerical control spinning machine, which can solve the problem of controlling the balance of the transverse forces of three spinning wheels in the spinning process.
In order to achieve the above purpose, the invention provides the following technical scheme:
a force balance control method of a three-spinning-wheel numerical control spinning machine comprises the following steps: setting the total pressing amount of a first spinning roller, a second spinning roller and a third spinning roller, setting the initial pressing positions of the first spinning roller, the second spinning roller and the third spinning roller respectively, and setting the offset distance between the first spinning roller and the second spinning roller and between the second spinning roller and the third spinning roller respectively; determining the initial rolling reduction correction time of the first spinning wheel, the second spinning wheel and the third spinning wheel and the rolling reduction correction sampling period; after the spinning wheel is in place, respectively acquiring pressure data of a first spinning wheel, a second spinning wheel and a third spinning wheel; determining a standard pressure value of the spinning wheel; and at the initial rolling reduction correction time of the first spinning wheel, the second spinning wheel and the third spinning wheel, simultaneously correcting the rolling reductions of the first spinning wheel, the second spinning wheel and the third spinning wheel for the first time according to the collected pressure data and standard pressure values of the first spinning wheel, the second spinning wheel and the third spinning wheel, and then correcting the rolling reductions of the first spinning wheel, the second spinning wheel and the third spinning wheel simultaneously in each rolling reduction correction sampling period, wherein the sum of the rolling reductions of the first spinning wheel, the second spinning wheel and the third spinning wheel is unchanged in the correction process.
Further, in the above method for controlling force balance of a three-spinning-roller numerical control spinning machine, the setting of the total pressing amount of the first spinning roller, the second spinning roller and the third spinning roller, the setting of the initial pressing positions of the first spinning roller, the second spinning roller and the third spinning roller, and the setting of the misalignment amounts between the first spinning roller and the second spinning roller and between the second spinning roller and the third spinning roller respectively include: calculating initial pressing positions of three spinning wheels, offset amount among the spinning wheels and longitudinal feeding speed according to the wall thickness requirement of a spinning workpiece blank, the wall thickness requirement of a spinning workpiece product, the limiting reduction rate of materials and the arrangement of spinning passes; wherein, the total rolling reduction of the first rotating wheel, the second rotating wheel and the third rotating wheel is recorded as delta H 0 The initial pressing positions of the first rotating wheel, the second rotating wheel and the third rotating wheel are respectively marked as H 1 、H 2 And H 3 Taking the distance from the spinning wheel to the reference by taking the outer surface of the core mold or the inner surface of the workpiece blank as the reference at the initial pressing position; the offset distance between the first rotary wheel and the second rotary wheel and between the second rotary wheel and the third rotary wheel are respectively marked as S 1 、S 2 The longitudinal feed speed is denoted as V.
Further, in the above method for controlling force balance in a three-spinning-roller numerical control spinning machine, the determining initial rolling reduction correction timings of the first spinning roller, the second spinning roller, and the third spinning roller, and the rolling reduction correction sampling period may include: after the first rotating wheel, the second rotating wheel and the third rotating wheel all reach the initial pressing position, any time is selected as the initial pressing amount correction time of the first rotating wheel, the second rotating wheel and the third rotating wheel and is marked as T 1 (ii) a After the initial rolling reduction correction time of the first rotating wheel, the second rotating wheel and the third rotating wheel, the correction duration T is firstly passed, then the correction interval time Deltat is passed, the second rolling reduction correction time of the first rotating wheel, the second rotating wheel and the third rotating wheel is determined, and is marked as T 2 (ii) a Reduction correctionThe positive sampling period is recorded as Δ T, Δ T = T +/Δ T; where Δ t > S/V, and S ∈ max (S) 1 ，S 2 )；△T＞(S 1 +S 2 )/V。
Further, in the above method for controlling the force balance in the three-spinning-roller numerical control spinning machine, the arbitrary timing as the initial rolling reduction correction timing of the first spinning roller, the second spinning roller, and the third spinning roller includes: the first spinning wheel, the second spinning wheel and the third spinning wheel are in contact with a spinning workpiece and reach initial pressing positions respectively, the three spinning wheels start to rotate simultaneously and feed axially along the direction of the spinning workpiece, after the spinning workpiece advances for a stroke L, the three spinning wheels all enter a stable working state, transverse spinning pressure data of the three spinning wheels are collected simultaneously, and the first spinning wheel, the second spinning wheel and the third spinning wheel start to perform first pressing amount correction and are marked as time T 1 。
Further, in the above method for controlling force balance of a three-spinning-roller numerical control spinning machine, after the spinning roller is in place, the method respectively collects pressure data of the first spinning roller, the second spinning roller and the third spinning roller, and comprises the steps of: after the first rotating wheel, the second rotating wheel and the third rotating wheel all reach the initial pressing position, according to the acquired pressure data, the actual pressing positions of the first rotating wheel, the second rotating wheel and the third rotating wheel are subjected to rotating wheel in-place judgment; if any spinning wheel does not reach the initial pressing position, the spinning wheel is positioned again; if the first rotating wheel, the second rotating wheel and the third rotating wheel all reach the initial pressing position, after the workpiece axially travels a stroke L, the three rotating wheels all enter a stable working state, and pressure data of the first rotating wheel, the second rotating wheel and the third rotating wheel are collected simultaneously.
Further, in the above method for controlling force balance of a three-spinning-roller numerical control spinning machine, the determining a trajectory of a third spinning roller includes: and presetting the track of the third spinning wheel through the system according to the wall thickness of the spinning workpiece product.
Further, in the above method for controlling force balance of a three-spinning-wheel numerical control spinning machine, the determining a standard pressure value of the spinning wheel includes: selecting the average pressure value of the first spinning wheel, the second spinning wheel and the third spinning wheel as the standard pressure value of the spinning wheels, namely p 0 ＝(p 1 +p 2 +p 3 ) /3 wherein p 0 Is a standard pressure value of the spinning wheel, p 1 For the pressure data of the first spinning wheel, p 2 For the pressure data of the second spinning wheel, p 3 Is the pressure data collected for the third spinning wheel.
Further, in the above method for controlling force balance in a three-spinning-roller numerical control spinning machine, the first correction of the rolling reduction of the first spinning roller, the second spinning roller, and the third spinning roller includes: simultaneously, the pressing states of the first rotating wheel, the second rotating wheel and the third rotating wheel are judged for the first time; correcting the first spinning wheel, the second spinning wheel or the third spinning wheel for the first time according to the pressing states of the first spinning wheel, the second spinning wheel and the third spinning wheel; preferably, the first determination of the pressing states of the first spinning roller, the second spinning roller and the third spinning roller at the same time includes: judging the pressing state of the first rotary wheel for the first time; judging the pressing state of the second rotary wheel for the first time; judging the pressing state of the third rotating wheel for the first time; still preferably, the first determination of the pressing states of the first spinning roller, the second spinning roller, and the third spinning roller includes: calculating the difference value delta p between the pressure value of the first spinning wheel and the standard pressure value of the spinning wheel 1 Wherein Δ p 1 ＝p 1 -p 0 (ii) a If Δ p 1 If the voltage is less than 0, the first rotating wheel is judged to be in an undervoltage state; if Δ p 1 If the voltage is more than 0, judging that the first rotating wheel is in an overvoltage state; if Δ p 1 =0, judging that the first rotating wheel is in a positive pressure state; calculating the difference value delta p between the pressure value of the second spinning wheel and the standard pressure value of the spinning wheel 2 Wherein Δ p 2 ＝p 2 -p 0 (ii) a If Δ p 2 If the voltage is less than 0, the second rotating wheel is judged to be in an under-voltage state; if Δ p 2 If the voltage is more than 0, judging that the second rotating wheel is in an overvoltage state; if Δ p 2 =0, and the second rotating wheel is judged to be in a positive pressure state; calculating the difference value delta p between the pressure value of the third spinning wheel and the standard pressure value of the spinning wheel 3 Wherein Δ p 3 ＝p 3 -p 0 (ii) a If Δ p 3 If the voltage is less than 0, the third rotating wheel is judged to be in an undervoltage state; if Δ p 3 If the voltage is more than 0, judging that the third rotating wheel is in an overvoltage state; if Δ p 3 And =0, the third wheel is determined to be in a positive pressure state.
Further, in the above method for controlling force balance in a three-spinning-roller numerical control spinning machine, the first correction of the first spinning roller, the second spinning roller, and the third spinning roller according to the pressing-down states of the first spinning roller, the second spinning roller, and the third spinning roller includes: correcting the first spinning wheel, the second spinning wheel or the third spinning wheel for the first time according to the pressing states of the first spinning wheel, the second spinning wheel and the third spinning wheel; preferably, the first correction of the first spinning wheel according to the depressed state of the first spinning wheel comprises: according to the pressing state of the first rotating wheel, the pressing position of the first rotating wheel is changed, namely the pressing position of the first rotating wheel is changed from the initial pressing position H 1 Is changed to H 1 ', make the first spinning roller press down quantity delta H 1 ＝H 1 ’-H 1 (ii) a When the first rotary wheel is in an under-voltage state, the triangle H 1 When the rolling amount of the first rotating wheel is more than 0, the rolling amount of the first rotating wheel is increased and adjusted, and when the first rotating wheel is in an overpressure state, the delta H is 1 Less than 0, the reduction of the first rotating wheel is adjusted, and when the first rotating wheel is in a positive pressure state, the delta H 1 =0, the rolling reduction of the first rotating wheel is not adjusted; still preferably, the first correction of the second wheel according to the depressed state of the second wheel includes: according to the pressing state of the second rotating wheel, the pressing position of the second rotating wheel is changed, namely the pressing position of the second rotating wheel is changed from H 2 Is changed to H 2 ' let the second rotary wheel press down quantity delta H 2 ＝H 2 ’-H 2 (ii) a When the second rotary wheel is in under-voltage state, delta H 2 When the rolling reduction of the second rotating wheel is increased and adjusted and the second rotating wheel is in an overpressure state, the delta H is larger than 0 2 Less than 0, the rolling reduction of the second rotating wheel is reduced and adjusted, and when the second rotating wheel is in a positive pressure state, the delta H 2 =0, the rolling reduction of the second rotating wheel is not adjusted; according to the pressing state of the third rotating wheel, the pressing position of the third rotating wheel is changed, namely the pressing position of the third rotating wheel is changed from H 3 Is changed to H 3 ' let the third rotary wheel press down quantity delta H 3 ＝H 3 ’-H 3 (ii) a When the third rotary wheel is in an under-voltage state, the triangle H 3 When the rolling reduction of the third rotating wheel is more than 0, the rolling reduction of the third rotating wheel is increased and adjustedWhen the third rotary wheel is in an overvoltage state, the triangle H 3 Less than 0, the rolling reduction of the third rotating wheel is reduced and adjusted, and when the third rotating wheel is in a positive pressure state, the triangle H 3 And =0, the pressing amount of the third rotary wheel is not adjusted.
Further, in the above method for controlling force balance in a three-spinning-roller numerical control spinning machine, after the simultaneous first correction of the rolling amounts of the first spinning roller, the second spinning roller, and the third spinning roller, the method further comprises: after the first spinning wheel, the second spinning wheel and the third spinning wheel are simultaneously corrected for the first time, pressure data of the first spinning wheel, the second spinning wheel and the third spinning wheel are collected again at intervals of delta T, the pressing states of the first spinning wheel, the second spinning wheel and the third spinning wheel are judged, and the first spinning wheel, the second spinning wheel and the third spinning wheel are simultaneously corrected. Wherein, the rolling reduction of the first rotating wheel, the second rotating wheel and the third rotating wheel after each correction satisfies the delta H 1 +△H 2 +△H 3 ＝△H 0 。
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
1. the invention can realize the automatic detection and feedback function control of the spinning force of the transverse three spinning wheels of the three-wheel spinning machine, and greatly improve the precision of spinning workpieces, particularly the straightness and roundness precision;
2. the invention can realize the balanced stress of the main shaft and the spinning wheel of the three-wheel spinning machine in the spinning process, thereby greatly prolonging the service life of the spinning machine;
3. the method can automatically acquire process data to form a database containing materials and processes, and is beneficial to the application of the spinning process in the field of intelligent manufacturing.
4. The invention can realize the process control of the three-wheel spinning machine in the spinning process, and particularly aims at the special-shaped cylindrical part with a complex structure, the forming quality is reliable, and the technical benefit and the economic benefit are obvious.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic diagram of a process of spinning a workpiece by a force balance control method of a three-spinning-wheel numerical control spinning machine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a time period for calibrating a first spinning roller, a second spinning roller and a third spinning roller of a force balance control method for a three-spinning-roller numerical control spinning machine according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of the force balance control method for a three-spinning-wheel numerical control spinning machine according to the embodiment of the present invention for adjusting the rolling reduction of the first spinning wheel, the second spinning wheel and the third spinning wheel;
FIG. 4 is a schematic cross-sectional view of a lateral triple-spinning roller of the force balance control method for a numerically controlled spinning machine with three spinning rollers according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a workpiece forming angle, a spinning roller forming angle, and forming angles between spinning rollers according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a spin wheel calibration cycle.
Description of reference numerals:
1-a first spinning wheel; 2-a second spinning wheel; 3-a third spinning wheel; 4-spinning the workpiece.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
As shown in fig. 4, the positions of the three transverse spinning rollers of the spinning machine are respectively located on the periphery of the spinning workpiece 4 and distributed in an equilateral triangle.
As shown in FIG. 5, the present invention is directed to an offset spinning process, in which three spinning wheels are spaced apart from each other in the direction of spinning the workpiece 4, referred to as axial offset S 1 And S 2 While being spaced apart from each other in a diametrical direction by a distance, called radial (transverse) offset Δ h 1 And Δ h 2 . Wherein, the forming angle of the spinning workpiece 4 is r, the forming angles of the three spinning wheels are all alpha, and the forming angle between the first spinning wheel 1 and the second spinning wheel 2 is beta 1 The forming angle between the second rotary wheel 2 and the third rotary wheel 3 is beta 2 Respectively satisfy tan beta 1 ＝△h 1 /S 1 ，tanβ 2 ＝△h 2 /S 2 . The forming angle satisfies r < alpha < beta 1 \β 2 Is a precondition for the offset spinning method.
As shown in fig. 6, fig. 6 is a schematic diagram of the composition of the spin wheel calibration cycle. In fig. 6, t is the correction duration time of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3, Δ t is the interval time between a certain correction of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 and the previous correction, and Δ t appears after the first correction; Δ T is the correction period.
As shown in fig. 1 to 6, according to an embodiment of the present invention, there is provided a force balance control method of a three-spinning-wheel numerical control spinning machine, including the steps of:
s1, setting the total pressing amount of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3, setting the initial pressing positions of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 respectively, and setting the offset amount between the first spinning wheel 1 and the second spinning wheel 2 and between the second spinning wheel 2 and the third spinning wheel 3 respectively.
And S2, respectively determining the initial rolling reduction correction time of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 and the rolling reduction correction sampling period.
And S3, respectively acquiring pressure data of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 after the spinning wheels are in place.
And S4, determining the track of the third spinning wheel 3 and determining the standard pressure value of the spinning wheel.
And S5, at the initial rolling reduction correction time of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3, simultaneously correcting the rolling reductions of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 for the first time according to the collected pressure data and standard pressure values of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3, and then simultaneously correcting the rolling reductions of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 in each rolling reduction correction sampling period.
In the above method for controlling the force balance of the three-spinning-wheel numerical control spinning machine, as a preferred embodiment, the step S1 specifically includes:
calculating the total rolling reduction of the three spinning wheels, the initial rolling position, the offset between the spinning wheels and the longitudinal feeding speed according to the wall thickness requirement of the blank of the spinning workpiece 4, the wall thickness requirement of the product of the spinning workpiece 4, the limiting reduction rate of the material and the arrangement of the spinning passes;
wherein, the total rolling reduction of the first rotary wheel 1, the second rotary wheel 2 and the third rotary wheel 3 is recorded as delta H 0 Initial depressed positions are respectively denoted as H 1 、H 2 And H 3 The axial displacement between the first rotary wheel 1 and the second rotary wheel 2 and the axial displacement between the second rotary wheel 2 and the third rotary wheel 3 are respectively marked as S 1 、S 2 The longitudinal feed speed is denoted as V.
In the above method for controlling the force balance of the three-spinning-wheel numerical control spinning machine, as a preferred embodiment, the step S2 specifically includes:
after the first spinning roller 1, the second spinning roller 2, and the third spinning roller 3 all reach the initial rolling position, an arbitrary time is selected as the initial rolling amount correction time of the first spinning roller 1, the second spinning roller 2, and the third spinning roller 3, and is denoted as T 1 ；
After the initial rolling reduction correction time of the first rotating wheel 1, the second rotating wheel 2 and the third rotating wheel 3, the correction duration is firstly passedT, the correction interval time Deltat is further passed, and the initial rolling reduction correction time of the first rotating wheel 1, the second rotating wheel 2 and the third rotating wheel 3 for the second time is determined and recorded as T 2 ；
The sampling period of the rolling reduction correction is recorded as delta T, and the delta T = T +/delta T;
where Δ t > S/V, and S ∈ max (S) 1 ，S 2 )；
△T＞(S 1 +S 2 )/V。
In the whole spinning process, the main shaft drives the die to rotate, the spinning workpiece 4 is installed on the die, the die drives the spinning workpiece 4 to rotate, and after the spinning wheel is in contact with the spinning workpiece 4, the spinning workpiece 4 rotates actively, and the spinning wheel rotates passively. The motion trail of each rotary wheel is as follows: the first spinning roller 1 firstly moves for one circle around the spinning workpiece 4 to form a thread track, the second spinning roller 2 rolls the track of the first spinning roller 1, and the third spinning roller 3 rolls the thread track remained by the second spinning roller 2, so that the spinning workpiece 4 is regularly thinned, and the forming purpose is achieved.
In the above method for controlling the force balance of the three-spinning-roller numerical control spinning machine, preferably, the selecting an arbitrary timing as the initial rolling reduction correction timing of the first spinning roller 1, the second spinning roller 2, and the third spinning roller 3 includes:
the first spinning roller 1, the second spinning roller 2 and the third spinning roller 3 are simultaneously contacted with the slope of the spinning end of the spinning workpiece 4, the initial positions of the three spinning rollers are shown in fig. 5, the three spinning rollers simultaneously start to rotate and axially feed along the direction of the spinning workpiece 4, after the three spinning rollers advance for one stroke L, the three spinning rollers all enter a stable working state, the data of the transverse spinning pressure of the three spinning rollers are simultaneously acquired, and the first spinning roller 1, the second spinning roller 2 and the third spinning roller 3 start to rotate for the first time (time T) 1-1 ) And (5) correcting the rolling reduction.
In the above method for controlling the force balance of the three-spinning-wheel numerical control spinning machine, as a preferred embodiment, the step S3 specifically includes:
after the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 reach the initial pressing position, performing spinning wheel in-place judgment on the actual pressing positions of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 according to the acquired pressure data;
if any spinning wheel does not reach the initial pressing position, the spinning wheel is positioned again;
if the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 all reach the initial pressing position, after the spinning workpiece 4 axially travels for a stroke L, the three spinning wheels all enter a stable working state, and meanwhile, pressure data of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 are collected.
In the above method for controlling the force balance of the three-spinning-roller numerical control spinning machine, as a preferable scheme, in the step S4, the determining of the track of the third spinning roller 3 specifically includes the following steps:
and (3) presetting the track of the third spinning wheel 3 through the system according to the wall thickness of the spinning workpiece 4 product.
In the above method for controlling the force balance of the three-spinning-wheel numerical control spinning machine, as a preferred scheme, in step S5, the method for determining the standard pressure value of the spinning wheel specifically includes the following steps:
selecting the average pressure value of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 as the spinning wheel standard pressure value, namely p 0 ＝(p 1 +p 2 +p 3 ) /3 wherein p is 0 Is a standard pressure value of the spinning wheel, p 1 For the acquired pressure data of the first spinning wheel 1, p 2 For the pressure data, p, of the second spinning wheel 2 collected 3 Is the pressure data acquired for the third spinning wheel 3.
In the above method for controlling the force balance of the three-spinning-roller numerical control spinning machine, preferably, in step S5, the simultaneous first correction of the rolling reduction of the first spinning roller 1, the second spinning roller 2, and the third spinning roller 3 includes:
s51, simultaneously judging the pressing states of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 for the first time;
and S52, respectively carrying out primary correction on the first spinning roller 1, the second spinning roller 2 and the third spinning roller 3 according to the pressing states of the first spinning roller 1, the second spinning roller 2 and the third spinning roller 3.
Wherein, step S51 specifically includes:
step S511, performing a first determination on the depression state of the first spinning roller 1;
step S512, the first judgment is carried out on the pressing state of the second rotary wheel 2;
in step S513, the first determination is made as to the depressed state of the third reel 3.
Wherein, step S511 specifically includes:
calculating the difference value delta p between the pressure value of the first spinning wheel 1 and the standard pressure value of the spinning wheel 1 Wherein Δ p 1 ＝p 1 -p 0 ；
If Δ p 1 If the voltage is less than 0, the first rotating wheel 1 is judged to be in an under-voltage state;
if Δ p 1 If the voltage is more than 0, the first rotating wheel 1 is judged to be in an overvoltage state;
if Δ p 1 And =0, the first spinning wheel 1 is determined to be in the positive pressure state.
Wherein, step S512 specifically includes:
calculating the difference value delta p between the pressure value of the second spinning wheel 2 and the standard pressure value of the spinning wheel 2 Wherein Δ p 2 ＝p 2 -p 0 ；
If Δ p 2 If the voltage is less than 0, the second rotating wheel 2 is judged to be in an under-voltage state;
if Δ p 2 If the voltage is more than 0, the second rotating wheel 2 is judged to be in an overvoltage state;
if Δ p 2 And =0, the second rotary wheel 2 is determined to be in the positive pressure state.
Wherein, step S513 specifically includes:
calculating the difference value delta p between the pressure value of the third spinning wheel 3 and the standard pressure value of the spinning wheel 3 Wherein Δ p 3 ＝p 3 -p 0 ；
If Δ p 3 If the voltage is less than 0, the third rotating wheel 3 is judged to be in an under-voltage state;
if Δ p 3 If the voltage is more than 0, the third rotating wheel 3 is judged to be in an overvoltage state;
if Δ p 3 =0, and the third rotating wheel 3 is determined to be in a positive pressure state.
In the above method for controlling the force balance of the three-spinning-wheel numerical control spinning machine, as a preferred solution, the step S52 specifically includes: :
step S521, performing first correction on the first spinning roller 1 according to the pressing state of the first spinning roller 1;
step S522, performing a first correction on the second spinning roller 2 according to the pressing state of the second spinning roller 2;
step S523, the third spinning roller 3 is corrected for the first time according to the pressing state of the third spinning roller 3.
Wherein, step S521 specifically includes:
according to the pressing state of the first spinning wheel 1, the pressing position of the first spinning wheel 1 is changed, namely the pressing position of the first spinning wheel 1 is changed from the initial pressing position H 1 Is changed to H 1 ', order DeltaH 1 ＝H 1 ’-H 1 ；
When the first rotary wheel 1 is in an under-voltage state, a delta H 1 The rolling reduction of the first rotary wheel is increased and adjusted when the rolling reduction is more than 0,
when the first rotary wheel 1 is in an overvoltage state, a delta H 1 Less than 0, the reduction adjustment is carried out on the pressing amount of the first rotating wheel,
when the first rotary wheel 1 is in a positive pressure state, a delta H 1 =0, the rolling reduction of the first spinning wheel is not adjusted.
Wherein, step S522 specifically includes:
according to the pressing state of the second rotating wheel 2, the pressing position of the second rotating wheel 2 is changed, namely the pressing position of the second rotating wheel 2 is changed from H 2 ' Change to H 2 ", make Δ H 2 ＝H 2 ”-H 2 ’；
When the second rotary wheel 2 is in an under-voltage state, the triangle H 2 The rolling reduction of the second rotating wheel 2 is increased and adjusted when the rolling reduction is more than 0,
when the second rotary wheel 2 is in an overvoltage state, a delta H 2 Less than 0, the reduction adjustment is carried out on the pressing amount of the second rotating wheel 2,
when the second rotary wheel 2 is in a positive pressure state, a delta H 2 And =0, the amount of pressing of the second reel 2 is not adjusted.
Wherein, step S523 specifically includes:
according to the pressing state of the third rotary wheel 3, the first rotary wheel is changedThe depressed position of the third reel 3, i.e., the depressed position of the third reel 3, is represented by H 3 Is changed to H 3 ', order DeltaH 3 ＝H 3 ’-H 3 ；
When the third rotary wheel 3 is in an under-voltage state, a delta H 3 The pressing amount of the third rotating wheel 3 is increased and adjusted when the pressing amount is more than 0,
when the third rotary wheel 3 is in an overvoltage state, a delta H 3 If the rolling reduction is less than 0, the rolling reduction of the third rotating wheel 3 is reduced and adjusted,
when the third rotary wheel 3 is in a positive pressure state, a delta H 3 And =0, the pressing amount of the third reel 3 is not adjusted.
In the above method for controlling the force balance of the three-spinning-wheel numerical control spinning machine, as a preferred scheme, the method further includes step S6, where step S6 specifically is:
after the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 are simultaneously corrected for the first time, pressure data of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 are collected again at intervals of delta T, the pressing states of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 are judged, and the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 are simultaneously corrected. Wherein, the rolling reduction of the first rotating wheel, the second rotating wheel and the third rotating wheel after each correction satisfies the delta H 1 +△H 2 +△H 3 ＝△H 0 。
It should be noted that when the force balance control method of the three-spinning-wheel numerical control spinning machine is implemented, the conditions of non-final-pass spinning with high requirement on the wall thickness precision of a product or all-pass spinning with low requirement on the wall thickness precision of the product need to be met.
When the method is implemented, the following operation processes are adopted:
the first step is as follows: inputting initial parameters:
(1) Determining the total rolling reduction quantity delta H of three rotary wheels 0 Initial depressed position H 1 、H 2 And H 3 The offset S between the first rotary wheel 1 and the second rotary wheel 2 1 The offset S between the second rotary wheel 2 and the third rotary wheel 3 2 The longitudinal feeding speed V of the spinning wheel advancing along the axial direction of the spinning workpiece 4;
and calculating initial pressing positions of the three spinning wheels, offset amount among the spinning wheels and longitudinal feeding speed according to the wall thickness requirement of a spinning blank, the wall thickness requirement of a spinning product, the limit thinning rate of materials, the spinning channel order and the like.
(2) And determining the initial rolling reduction correction time T1, the second rolling reduction correction time T2, the correction duration time T, the correction interval time Deltat and the rolling reduction correction sampling period Deltat of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3. The second rolling reduction correction time T2 needs to satisfy the condition: Δ T = T + Δt, T2= T1+ Δt.
The reduction correction period is related to the offset between the spinning wheels and the longitudinal feed speed. In the whole spinning process, the main shaft drives the die to rotate, the die drives the spinning workpiece 4 to rotate, and after the spinning wheel is contacted with the spinning workpiece 4, the spinning workpiece 4 rotates actively, and the spinning wheel rotates passively. The motion trail of each rotary wheel is as follows: the first spinning roller 1 firstly moves around the spinning workpiece 4 for one circle to form a thread track, the second spinning roller 2 rolls the track of the first spinning roller 1, and the third spinning roller 3 rolls the thread track remained by the second spinning roller 2, so that the spinning workpiece 4 is regularly thinned, and the purpose of forming is achieved.
The first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 are simultaneously contacted with the slope of the spinning end of the spinning workpiece 4, the initial positions of the three spinning wheels are shown in figure 4, the three spinning wheels simultaneously start to rotate and axially feed along the direction of the spinning workpiece 4, after the three spinning wheels advance for one stroke L, the three spinning wheels all enter a stable working state, the data of the transverse spinning pressure of the three spinning wheels are simultaneously acquired, and the first spinning wheel 1 and the second spinning wheel 2 start to spin for the first time (time T) 1 ) And (5) correcting the rolling reduction. The correction is then sampled at a period of Δ T.
After the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 start to perform first rolling reduction correction, the rolling reduction correction duration time T is firstly performed, then the rolling reduction correction interval time Deltat is performed, data of three transverse oil cylinder pressure sensors are collected and processed, the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 start to perform second (time T2) rolling reduction correction, and then sampling correction is performed according to the Deltat period. Wherein, the first rolling reduction of the first rotating wheel 1, the second rotating wheel 2 and the third rotating wheel 3 is correctedThe interval should satisfy Deltat > S/V, S ∈ max (S) 1 ，S 2 )；△T＞(S 1 +S 2 )/V。
The second step is that: the spinning wheel is in place, and the transverse pressure data of three spinning wheels are collected:
a2.1, three rotary wheels reach a designated pressing position H according to a preset program 1 、H 2 And H 3 ；
A2.2, the system carries out spinning wheel in-place judgment on the actual pressing positions of the three spinning wheels according to the acquired pressure signals; the process is electrically and automatically adjusted, belongs to an observation process, the system is adjusted in place by 100 percent, and the adjustment time is judged to be related to the transverse feeding speed of the spinning wheel according to the distance between the spinning wheel and the surface of the spinning workpiece 4;
and A2.3, if the three spinning wheels reach the specified positions, judging that the spinning wheels are in place by the system, and continuously acquiring pressure data of the three spinning wheels.
The third step: judging the pressing states of the first rotating wheel 1, the second rotating wheel 2 and the third rotating wheel 3:
a3.1, determining the criterion value p 0 Determination criterion value p 0 The average pressure values of three spinning wheels are selected.
A3.2, calculating the average pressure value p of the three rotary wheels 0 ，
p 0 ＝(p 1 +p 2 +p 3 )/3，
Wherein p1 is pressure data of the first spinning wheel 1 collected by the system,
p 2 the pressure data of the second spinning wheel 2 collected for the system,
p 3 pressure data for the third spinning wheel 3 is collected for the system.
A3.3, calculating the difference value delta p between the first rotating wheel 1 and a standard value 1 ，△p 1 ＝p 1 -p 0 (ii) a Calculating the difference value delta p between the second rotating wheel 2 and the standard value 2 ，△p 2 ＝p 2 -p 0 (ii) a Calculating the difference value delta p between the third rotating wheel 3 and the standard value 3 ，△p 3 ＝p 3 -p 0 。
A3.4, according to the pressure difference Δ p 1 For the first rotary wheel 1The pressing state is judged according to the following,
if Δ p 1 If the voltage is less than 0, the first rotating wheel 1 is judged to be in an under-voltage state;
if Δ p 1 If the voltage is more than 0, the first rotating wheel 1 is judged to be in an overvoltage state;
if Δ p 1 And =0, the first spinning wheel 1 is determined to be in the positive pressure state.
A3.5, according to the pressure difference Δ p 2 The pressing state of the second rotary wheel 2 is judged according to the following,
if Δ p 2 If the voltage is less than 0, the second rotating wheel 2 is judged to be in an under-voltage state;
if Δ p 2 If the voltage is more than 0, the second rotating wheel 2 is judged to be in an overvoltage state;
if Δ p 2 And =0, the second rotary wheel 2 is determined to be in the positive pressure state.
A3.6 according to the pressure difference Δ p 3 The depressing state of the third reel 3 is judged according to the following,
if Δ p 3 If the voltage is less than 0, the third rotating wheel 3 is judged to be in an undervoltage state;
if Δ p 3 If the voltage is more than 0, the third rotating wheel 3 is judged to be in an overvoltage state;
if Δ p 3 =0, and the third rotating wheel 3 is determined to be in a positive pressure state.
The fourth step: presetting the track of the third spinning wheel 3:
the third rotating wheel 3 is generally a shaping wheel, and the pressing position is determined according to the wall thickness change and the precision requirement of the product, and the track is preset by a system program.
The fifth step: and simultaneously adjusting the first rotating wheel 1, the second rotating wheel 2 or the third rotating wheel 3:
a5.1, on the basis of the determination of the track of the third rotating wheel 3, the system presses the first rotating wheel 1 and the second rotating wheel 2 down at the time T 1 Beginning to correct the first rolling reduction of the first rotating wheel 1, the second rotating wheel 2 or the third rotating wheel 3, wherein the correction duration t and the correction pressure F are adjustable, the correction duration t is generally 10-50 ms, and the correction pressure F is generally 2-10 kN;
a5.2, correction by first reductionAfter that, the first rotary wheel 1 is driven from the position H 1 Change to position H 1 ', the reduction is Delta H 1 ＝H 1 ＇-H 1 ，
Wherein H 1 To adjust the position of the first spinning wheel 1 pressed down before,
H 1 ' is the position pressed by the first rotating wheel 1 after adjustment,
when the first rotary wheel 1 is in an under-voltage state, a delta H 1 The rolling reduction of the first rotary wheel is increased and adjusted when the rolling reduction is more than 0,
when the first rotary wheel 1 is in an overvoltage state, a delta H 1 Less than 0, the reduction adjustment is carried out on the pressing amount of the first rotating wheel,
when the first rotary wheel 1 is in a positive pressure state, a delta H 1 =0, the rolling reduction of the first rotating wheel is not adjusted;
after the first rolling reduction correction, the second rotary wheel 2 is driven from the position H 2 Change to position H 2 ', the reduction is Delta H 2 ＝H 2 ＇-H 2 ，
Wherein H 2 For adjusting the front second rotary wheel 2 The position of the pressing-down is,
H 2 ' is the position where the second reel 2 is pressed down after adjustment.
When the second rotary wheel 2 is in an under-voltage state, the triangle H 2 The rolling reduction of the second rotating wheel 2 is increased and adjusted when the rolling reduction is more than 0,
when the second rotary wheel 2 is in an overvoltage state, a delta H 2 Less than 0, the reduction adjustment is carried out on the pressing amount of the second rotating wheel 2,
when the second rotary wheel 2 is in a positive pressure state, a delta H 2 =0, the rolling reduction of the second rotary wheel 2 is not adjusted;
after the first rolling reduction correction, the third rotary wheel 3 is driven from the position H 3 Change to position H 3 ', the reduction is Delta H 3 ＝H 3 ＇-H 23 ，
Wherein H 3 To adjust the position of the third spinning wheel 3 pressed down before,
H 3 ' is the position where the third reel 3 is pressed down after adjustment.
The third rotary wheel 3 is underAt the time of pressing state, delta H 3 The rolling reduction of the third rotating wheel 3 is increased and adjusted when the rolling reduction is more than 0,
when the third rotary wheel 3 is in an overvoltage state, a delta H 3 If the rolling reduction is less than 0, the rolling reduction of the third rotating wheel 3 is reduced and adjusted,
when the third rotary wheel 3 is in a positive pressure state, a delta H 3 =0, the rolling reduction of the third rotary wheel 3 is not adjusted;
a5.3, the pressing positions of the first rotating wheel 1, the second rotating wheel 2 and the third rotating wheel 3 are updated to be H 1 ＇、H 2 ' and H 3 The first regulation of the first, second and third spinning wheels 1, 2, 3 ends, followed by a sampling correction by the period Δ T.
And a sixth step: determining the trajectory of the first wheel 1, the second wheel 2 and the third wheel 3:
repeating the third step to the fifth step at T n The first spinning roller 1, the second spinning roller 2 and the third spinning roller 3 are simultaneously subjected to rolling reduction correction at any moment, wherein the rolling reduction of the first spinning roller, the second spinning roller and the third spinning roller after correction every time meets the requirement of delta H 1 +△H 2 +△H 3 ＝△H 0 (ii) a Determination of T n And finally determining the tracks of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3 according to the pressing states of the first spinning wheel 1, the second spinning wheel 2 and the third spinning wheel 3.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A force balance control method of a three-spinning-wheel numerical control spinning machine is characterized by comprising the following steps:
setting the total pressing amount of a first spinning roller, a second spinning roller and a third spinning roller, setting the initial pressing positions of the first spinning roller, the second spinning roller and the third spinning roller respectively, and setting the offset distance between the first spinning roller and the second spinning roller and between the second spinning roller and the third spinning roller respectively;
determining the initial rolling reduction correction time of the first spinning wheel, the second spinning wheel and the third spinning wheel and the rolling reduction correction sampling period;
after the spinning wheel is in place, respectively acquiring pressure data of a first spinning wheel, a second spinning wheel and a third spinning wheel;
determining a standard pressure value of the spinning wheel;
the determining of the spinning wheel standard pressure value comprises the following steps:
selecting the average pressure value of the first spinning wheel, the second spinning wheel and the third spinning wheel as the standard pressure value of the spinning wheels, namely p 0 =(p 1 +p 2 +p 3 ) /3 wherein p is 0 Is a standard pressure value of the spinning wheel, p 1 For the pressure data of the first spinning wheel collected, p 2 For the pressure data of the second spinning wheel, p 3 For the pressure data collected for the third wheel,
at the initial rolling reduction correction time of the first spinning wheel, the second spinning wheel and the third spinning wheel, the rolling reductions of the first spinning wheel, the second spinning wheel and the third spinning wheel are simultaneously corrected for the first time according to the collected pressure data and standard pressure values of the first spinning wheel, the second spinning wheel and the third spinning wheel, then the rolling reductions of the first spinning wheel, the second spinning wheel and the third spinning wheel are simultaneously corrected in each rolling reduction correction sampling period, and the sum of the rolling reductions of the first spinning wheel, the second spinning wheel and the third spinning wheel is unchanged in the correction process,
the total rolling reduction of the first rotating wheel, the second rotating wheel and the third rotating wheel is recorded as delta H 0 The initial pressing positions of the first rotating wheel, the second rotating wheel and the third rotating wheel are respectively marked as H 1 、H 2 And H 3 Taking the distance from the spinning wheel to the reference by taking the outer surface of the core mold or the inner surface of the workpiece blank as the reference at the initial pressing position;
the first correction is carried out on the pressing amount of the first rotating wheel, the second rotating wheel and the third rotating wheel, and the first correction comprises the following steps:
simultaneously, the pressing states of the first rotating wheel, the second rotating wheel and the third rotating wheel are judged for the first time;
correcting the first spinning wheel, the second spinning wheel or the third spinning wheel for the first time according to the pressing states of the first spinning wheel, the second spinning wheel and the third spinning wheel;
the simultaneous first judgment of the pressing states of the first spinning wheel, the second spinning wheel and the third spinning wheel comprises the following steps:
performing first judgment on the pressing state of the first rotating wheel;
judging the pressing state of the second rotary wheel for the first time;
judging the pressing state of the third rotating wheel for the first time;
the first judgment of the pressing states of the first spinning wheel, the second spinning wheel and the third spinning wheel comprises the following steps:
calculating the difference value delta p between the pressure value of the first spinning wheel and the standard pressure value of the spinning wheel 1 Wherein Δ p 1 =p 1 -p 0 ；
If Δ p 1 If the voltage is less than 0, the first rotating wheel is judged to be in an undervoltage state;
if Δ p 1 If the voltage is more than 0, judging that the first rotating wheel is in an overvoltage state;
if Δ p 1 =0, judging that the first rotating wheel is in a positive pressure state;
calculating the difference value delta p between the pressure value of the second spinning wheel and the standard pressure value of the spinning wheel 2 Wherein Δ p 2 =p 2 -p 0 ；
If Δ p 2 If the voltage is less than 0, the second rotating wheel is judged to be in an under-voltage state;
if Δ p 2 If the voltage is more than 0, judging that the second rotating wheel is in an overvoltage state;
if Δ p 2 =0, and the second rotating wheel is judged to be in a positive pressure state;
calculating the difference value delta p between the pressure value of the third spinning wheel and the standard pressure value of the spinning wheel 3 Wherein Δ p 3 =p 3 -p 0 ；
If Δ p 3 If the voltage is less than 0, the third rotating wheel is judged to be in an undervoltage state;
if Δ p 3 If the voltage is more than 0, judging that the third rotating wheel is in an overvoltage state;
if Δ p 3 =0, the third wheel is determined to be in a positive pressure state,
according to the state of rolling down of first spinning wheel, second spinning wheel and third spinning wheel to first spinning wheel, second spinning wheel and third spinning wheel carry out the first correction, include:
correcting the first spinning roller, the second spinning roller or the third spinning roller for the first time according to the pressing states of the first spinning roller, the second spinning roller and the third spinning roller;
the first correction of the first spinning wheel according to the pressing state of the first spinning wheel comprises:
according to the pressing state of the first rotating wheel, the pressing position of the first rotating wheel is changed, namely the pressing position of the first rotating wheel is changed from the initial pressing position H 1 Is changed to H 1 ' make the first rotary wheel press-down quantity delta H 1 =H 1 ’-H 1 ；
When the first rotary wheel is in an under-voltage state, the triangle H 1 The rolling reduction of the first rotary wheel is increased and adjusted when the rolling reduction is more than 0,
when the first rotary wheel is in an overvoltage state, the triangle H 1 Less than 0, the reduction adjustment is carried out on the pressing amount of the first rotating wheel,
when the first rotary wheel is in a positive pressure state, the triangle H 1 =0, the rolling reduction of the first rotating wheel is not adjusted;
the first correction of the second spinning roller according to the pressing state of the second spinning roller comprises:
according to the pressing state of the second rotating wheel, the pressing position of the second rotating wheel is changed, namely the pressing position of the second rotating wheel is changed from H 2 Is changed to H 2 ' let the second rotary wheel press down quantity delta H 2 =H 2 ’-H 2 ；
When the second rotary wheel is in under-voltage state, delta H 2 The pressing amount of the second rotary wheel is increased and adjusted when the pressing amount is more than 0,
when the second rotary wheel is in an overvoltage state, the triangle H 2 Less than 0, the reduction adjustment is carried out on the pressing amount of the second rotating wheel,
when the second rotary wheel is in a positive pressure state, the triangle H 2 =0, the rolling reduction of the second rotating wheel is not adjusted;
according to the pressing state of the third rotating wheel, the pressing position of the third rotating wheel is changed, namely the pressing position of the third rotating wheel is changed from H 3 Is changed to H 3 ' let the third rotary wheel press down quantity delta H 3 =H 3 ’-H 3 ；
When the third rotary wheel is in an under-voltage state, the triangle H 3 The pressing amount of the third rotating wheel is increased and adjusted when the pressing amount is more than 0,
when the third rotary wheel is in an overvoltage state, the triangle H 3 If the rolling reduction is less than 0, the rolling reduction of the third rotating wheel is reduced and adjusted,
when the third rotary wheel is in a positive pressure state, the triangle H 3 =0, the pressing amount of the third rotary wheel is not adjusted,
after the first correction is simultaneously performed on the rolling reduction of the first rotating wheel, the second rotating wheel and the third rotating wheel, the method further comprises the following steps:
after the first spinning wheel, the second spinning wheel and the third spinning wheel are simultaneously corrected for the first time at intervals of delta T, pressure data of the first spinning wheel, the second spinning wheel and the third spinning wheel are collected again, the pressing states of the first spinning wheel, the second spinning wheel and the third spinning wheel are judged, the first spinning wheel, the second spinning wheel and the third spinning wheel are simultaneously corrected, and the pressing amount of the first spinning wheel, the second spinning wheel and the third spinning wheel after each correction meets delta H 1 +△ H 2 +△ H 3 =△ H 0 。
2. The method as claimed in claim 1, wherein the setting of the total pressing amount of the first spinning roller, the second spinning roller and the third spinning roller, the setting of the initial pressing positions of the first spinning roller, the second spinning roller and the third spinning roller, and the setting of the offset distance between the first spinning roller and the second spinning roller and between the second spinning roller and the third spinning roller respectively comprises:
calculating initial pressing positions of three spinning wheels, offset amount among the spinning wheels and longitudinal feeding speed according to the wall thickness requirement of a spinning workpiece blank, the wall thickness requirement of a spinning workpiece product, the limiting reduction rate of materials and the arrangement of spinning passes;
wherein, the offset distance between the first rotary wheel and the second rotary wheel and between the second rotary wheel and the third rotary wheel is respectively marked as S 1 、S 2 The longitudinal feed speed is denoted as V.
3. The method of claim 2, wherein determining the initial draft correction times for the first, second and third rotors and the draft correction sampling period comprises:
after the first rotating wheel, the second rotating wheel and the third rotating wheel all reach the initial pressing position, any time is selected as the initial pressing amount correction time of the first rotating wheel, the second rotating wheel and the third rotating wheel and is marked as T 1 ；
After the initial rolling reduction correction time of the first spinning wheel, the second spinning wheel and the third spinning wheel, firstly, the correction duration time T is passed, then, the correction interval time delta T is passed, the second rolling reduction correction time of the first spinning wheel, the second spinning wheel and the third spinning wheel is determined, and the second rolling reduction correction time is recorded as T 2 ；
The sampling period of the rolling reduction correction is recorded as delta T, and the delta T = T +/delta T;
where Δ t > S/V, and S ∈ max (S) 1 ，S 2 ）；△T＞(S 1 +S 2 )/V。
4. The method of claim 3, wherein the step of correcting the initial rolling reduction of the first spinning roller, the second spinning roller, and the third spinning roller at any time comprises:
the first spinning wheel, the second spinning wheel and the third spinning wheel are in contact with a spinning workpiece and reach initial pressing positions respectively, the three spinning wheels start to rotate simultaneously and feed axially along the direction of the spinning workpiece, after the spinning workpiece advances for a stroke L, the three spinning wheels all enter a stable working state, transverse spinning pressure data of the three spinning wheels are collected simultaneously, and the first spinning wheel, the second spinning wheel and the third spinning wheel start to perform first pressing amount correction and are marked as time T 1 。
5. The method of claim 3, wherein collecting pressure data for the first spinning roller, the second spinning roller, and the third spinning roller after the spinning rollers are in place comprises:
after the first rotating wheel, the second rotating wheel and the third rotating wheel all reach the initial pressing position, carrying out rotating wheel in-place judgment on the actual pressing positions of the first rotating wheel, the second rotating wheel and the third rotating wheel according to the acquired pressure data;
if any spinning wheel does not reach the initial pressing position, the spinning wheel is positioned again;
if the first rotating wheel, the second rotating wheel and the third rotating wheel all reach the initial pressing position, after the workpiece axially travels a stroke L, the three rotating wheels all enter a stable working state, and pressure data of the first rotating wheel, the second rotating wheel and the third rotating wheel are collected simultaneously.
6. The method of force balance control in a three-reel, digitally controlled spinning machine of claim 3, wherein said determining the trajectory of the third reel comprises:
and presetting the track of the third spinning wheel through the system according to the wall thickness of the spinning workpiece product.
CN202011416470.8A 2019-12-30 2020-12-04 Force balance control method of three-spinning-wheel numerical control spinning machine Active CN112620460B (en)

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DE3402301A1 (en) * 1984-01-24 1985-08-01 Fritz Prof. Dr.-Ing. 5450 Neuwied Fischer DEVICE AND METHOD FOR PRESSING ROLLING
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