CN116393528A - Rolling forming control scheme for non-uniform section variable thickness piece - Google Patents

Rolling forming control scheme for non-uniform section variable thickness piece Download PDF

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Publication number
CN116393528A
CN116393528A CN202310360947.2A CN202310360947A CN116393528A CN 116393528 A CN116393528 A CN 116393528A CN 202310360947 A CN202310360947 A CN 202310360947A CN 116393528 A CN116393528 A CN 116393528A
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China
Prior art keywords
thickness
variable
roller
plate
wall
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Pending
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CN202310360947.2A
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Chinese (zh)
Inventor
校文超
孙勇
肖骏峰
吴康
杨军
郭秋泉
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Shensi Tangshi Chengdu Technology Co ltd
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Shensi Tangshi Chengdu Technology Co ltd
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Priority to CN202310360947.2A priority Critical patent/CN116393528A/en
Publication of CN116393528A publication Critical patent/CN116393528A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The invention discloses a roll forming control scheme of a variable thickness piece with non-uniform cross section, which comprises the following steps: s1, analyzing the condition of a variable-thickness plate to change a thickness part along the length direction, and measuring the actual thickness of the plate by adopting a thickness detection device before the variable-thickness plate passes through a rolling mill; s2, dividing a thin area, a thick area or a transition area of the variable-thickness plate through the acquired actual thickness; and S3, the whole roller press is provided with 20-50 sections of rollers, and the control of the positions of the rollers in each section is realized by adopting a servo electric cylinder. According to the invention, due to the existence of the actual plate thickness tolerance of the incoming material, the adjustment of the roller position needs to be changed in real time according to the specific numerical value of the detected thickness, and the gap between the inner roller and the outer roller is changed through the change of the roller position at one side so as to adapt to the thickness change of the part, and the required position of the roller is calculated in real time, so that the rolling forming of the variable-thickness part with the unequal section can be realized accurately.

Description

Rolling forming control scheme for non-uniform section variable thickness piece
Technical Field
The invention relates to the technical field of roll forming, in particular to a roll forming control scheme of a variable thickness piece with unequal cross sections.
Background
The rolling process is often used for producing parts with uniform cross-section shapes, and has the characteristics of high efficiency, economy and good forming quality, while for non-uniform cross-section parts, the production process needs to be improved.
The common non-uniform section parts comprise two types, wherein one type is that the wall thickness of the parts is equal, and the section is changed along the length direction; one is that the neutral line of the section is unchanged along the length direction, and the wall thickness of the part is changed.
In the prior art, the length direction variable thickness part can be divided into three cases:
1. the inner wall of the part is variable in thickness, and the outer wall is straight;
2. the outer wall of the part is variable in thickness, and the inner wall is straight;
3. the thickness of the inner wall and the outer wall of the part is changed.
However, in the prior art, there is a certain tolerance range in the length direction due to the variable-thickness plate. Assuming that the theoretical length of the thin section in the length direction is Amm, the measurement result of the actual plate shows that it is possible to be a± amm, where a is the measurement error. If the roller press is set to move in a fixed beat, i.e. once every Amm actions, the accumulated error after the forming of a plurality of parts can lead to unqualified subsequent product quality.
Disclosure of Invention
The invention aims to provide a rolling forming control scheme of a variable-thickness part with non-uniform cross section, in particular to a rolling forming process of a variable-thickness part along the length direction, which aims to solve the problem that the quality of a subsequent product is unqualified due to the fact that a certain tolerance range exists in the variable-thickness plate along the length direction and accumulated errors after a plurality of parts are formed when a roller press is set to move in a fixed beat.
In order to achieve the above purpose, the present invention provides the following technical solutions: the roll forming control scheme of the non-uniform section variable thickness piece comprises the following steps:
s1, analyzing the condition of a variable-thickness plate to change a thickness part along the length direction, and measuring the actual thickness of the plate by adopting a thickness detection device before the variable-thickness plate passes through a rolling mill;
s2, dividing a thin area, a thick area or a transition area of the variable-thickness plate through the acquired actual thickness;
s3, the whole roller press is provided with 20-50 sections of rollers, and the control of the positions of the rollers in each section is realized by adopting a servo electric cylinder;
s4, during rolling, calculating the required position of the section of roller in real time according to the real-time plate thickness measured by the thickness detection device and the distance between the rolling center line of the section of roller and the thickness detection point;
s5, for a variable-thickness plate with large thickness deviation, the number of position sensors can be increased, the closed-loop control servo electric cylinder can accurately meet the required position, or the rigidity of the whole roller press is increased, and in the rolling process, the control layer corrects the response of the servo electric cylinder according to the thickness change gradient.
Preferably, in step S1, the analysis of the case of the variable-thickness plate along the length direction is performed on variable-thickness parts, which includes the following three types: the inner wall of the part is variable in thickness, and the outer wall is straight; the outer wall of the part is variable in thickness, and the inner wall is straight; the thickness of the inner wall and the outer wall of the part is changed.
Preferably, in step S3, the position of each segment of the roll is adjusted to be changed in real time according to the specific value of the detected thickness.
Preferably, in step S4, the actual thickness detection accuracy is 0.01mm when the thickness detection device detects the real-time plate thickness.
Preferably, in step S1, the thickness detection is performed while the sheet is in a slightly stretched state when the actual thickness of the sheet is measured by the thickness detection device.
Preferably, when the inner wall of the part is thicker and the outer wall is flat, the position of the inner roller is changed along with the thickness change in the forming process, and the gap between the inner roller and the outer roller is changed due to the change of the position of the inner roller so as to adapt to the thickness change of the part.
Preferably, the outer wall of the part is thicker, the inner wall is flat, and in the forming process, the position of the outer roller is changed along with the thickness change, and the change of the position of the outer roller causes the gap between the inner roller and the outer roller to be changed so as to adapt to the thickness change of the part.
Preferably, when the thickness of the inner wall and the outer wall of the part is changed, the positions of the inner roller and the outer roller are changed along with the thickness change.
Preferably, in step S5, the plate thickness variation gradient refers to a variation speed of the plate thickness in the longitudinal direction.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, due to the fact that the actual thickness tolerance of the incoming material plate exists, the adjustment of the roller position is required to be changed in real time according to the specific numerical value of the detected thickness, the gap between the inner roller and the outer roller is changed through the change of the roller position at one side so as to adapt to the thickness change of a part, the position of each section of roller is independently controlled by the servo electric cylinder of the section, the required position of the section of roller is calculated in real time according to the real-time thickness detected by the thickness detection device and the distance between the rolling center line of the section of roller and the thickness detection point, a position signal is transmitted to the control board of the servo electric cylinder, and the response of the electric cylinder is controlled, so that the rolling forming of the variable-thickness part with the non-uniform section can be accurately realized.
Drawings
FIG. 1 is a flow chart of a roll forming control scheme for a non-uniform cross-section variable thickness member of the present invention;
FIG. 2 is a schematic diagram of the thin-thick zone analysis of a variable-thickness plate according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is evident that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2: the roll forming control scheme of the non-uniform section variable thickness piece comprises the following steps:
analyzing the condition of the variable-thickness plate along the length direction of the variable-thickness part, wherein the condition of the variable-thickness plate along the length direction of the variable-thickness part is analyzed and comprises the following three types:
1. the inner wall of the part is variable in thickness, and the outer wall is straight;
2. the outer wall of the part is variable in thickness, and the inner wall is straight;
3. the thickness of the inner wall and the outer wall of the part is changed.
Meanwhile, before the variable-thickness plate passes through the rolling mill, a certain tolerance range exists in the length direction of the variable-thickness plate, so that the actual thickness of the variable-thickness plate needs to be measured by adopting a thickness detection device before the variable-thickness plate passes through the rolling mill; the sheet thickness should be measured with the sheet material under slight tension. If the plate is in a loose state, the detection position is not fixed due to the fact that the plate can shake, and stable and reliable detection data cannot be provided for subsequent rolling. If the plate is in an overstretched state, the plate may be pulled apart, or the organization mechanical property of the material is changed, which is not beneficial to ensuring the product quality.
Dividing a thin area, a thick area or a transition area of the variable-thickness plate according to the acquired actual thickness; the thickness detection not only reflects the thickness variation of the plate, i.e. the current forming zone is a thin zone, a thick zone, or a specific location of the transition zone.
Step three, the whole roller press is provided with 20-50 sections of rollers, and the control of the positions of each section of roller is realized by adopting a servo electric cylinder; and the position of each section of roller is adjusted according to the specific value of the detected thickness,
step four, during rolling, calculating the required position of the section of roller in real time according to the real-time plate thickness measured by the thickness detection device and the distance between the rolling center line of the section of roller and the thickness detection point; the real-time plate thickness measured by the thickness measuring device has the actual thickness measuring precision reaching 0.01mm.
And fifthly, for a variable-thickness plate with large thickness deviation, the number of position sensors can be increased, the closed-loop control servo electric cylinder can accurately meet the required position, or the rigidity of the whole roll squeezer is increased, and in the rolling process, the control layer corrects the response of the servo electric cylinder according to the thickness variation gradient, wherein the thickness variation gradient refers to the variation speed of the thickness along the length direction.
Specifically, as shown in fig. 2, the thickness variation in the transition region between the thin region and the thick region may take various forms, including linear gradual change, nonlinear change, abrupt thickness change, and the like. Due to the existence of the actual incoming material plate thickness tolerance, the adjustment of the roller position is required to be changed in real time according to the specific value of the detected thickness.
The flexible control mode is used for adjusting the roller position in real time according to the difference of the thickness of the incoming materials so as to realize the roller forming of the variable-thickness part along the length direction.
The whole roller press has 20-50 sections of rollers which are unequal, and the control of the position of each section of roller needs to ensure enough precision and response speed, so that the control is realized by adopting a servo electric cylinder.
The position of each section of roller is independently controlled by a servo motor cylinder of the section. And calculating the required position of the section of roller in real time according to the real-time plate thickness measured by the thickness detection device and the distance between the rolling center line of the section of roller and the thickness detection point. The position signal is transmitted to a servo electric cylinder control board to control the response of the electric cylinder.
The rolling force is proportional to the plate thickness, and the rolling force required by the thick area of the plate is obviously larger than that required by the thin area. Therefore, for a plate with larger thickness deviation, the actual response position of the electric cylinder in the thick plate area and the required position have a certain deviation.
The solution method comprises the following two steps:
1. a position sensor is added, and a closed-loop control servo electric cylinder is used for realizing accurate meeting of the required position;
2. the rigidity of the whole equipment is increased, and the response of the servo motor cylinder is corrected according to the thickness variation at the control level.
Because the variable-thickness plate has obvious mechanical anisotropy in a transition area, the control layer needs to correct the response of the servo motor cylinder according to the plate thickness change gradient in the rolling process. The plate thickness variation gradient refers to the variation speed of the plate thickness in the longitudinal direction. The thickness detection of the detection device, signal processing, and independent control of the servo electric cylinders of all sections of rollers of the whole roller press all require a certain response time, so that the coordination of the whole device is ensured, and the rolling speed is not too high. So as to avoid the problem of the quality of the whole part product caused by the response lag of a certain link.
For the other two cases of the lengthwise variable thickness part, including:
1. when the inner wall of the part is thicker and the outer wall is flat, the position of the inner side roller is changed along with the thickness change in the forming process, and the gap between the inner side roller and the outer side roller is changed due to the change of the position of the inner side roller so as to adapt to the thickness change of the part.
2. The outer wall of the part is changed in thickness, the inner wall is flat, the position of the outer side roller is changed along with the thickness change in the forming process, and the gap between the inner roller and the outer roller is changed due to the change of the position of the outer side roller so as to adapt to the thickness change of the part.
3. When the thickness of the inner wall and the outer wall of the part is changed, the positions of the rollers arranged on the inner side and the outer side are changed along with the thickness change.
The application method and the working principle of the device are as follows: in the forming process, due to the fact that the actual thickness tolerance of the incoming material is present, the roller position is required to be changed in real time according to the specific numerical value of the detected thickness, the gap between the inner roller and the outer roller is changed through the change of the roller position on one side so as to adapt to the thickness change of a part, the position of each section of roller is independently controlled by the servo electric cylinder of the section, the required position of the section of roller is calculated in real time according to the real-time thickness detected by the thickness detection device and the distance between the rolling center line of the section of roller and the thickness detection point, a position signal is transmitted to the control board of the servo electric cylinder, and the response of the electric cylinder is controlled, so that the rolling forming of the accurate variable-thickness part with unequal section can be realized.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims (9)

1. The roll forming control scheme of the non-uniform section variable thickness piece is characterized by comprising the following steps of:
s1, analyzing the condition of a variable-thickness plate to change a thickness part along the length direction, and measuring the actual thickness of the plate by adopting a thickness detection device before the variable-thickness plate passes through a rolling mill;
s2, dividing a thin area, a thick area or a transition area of the variable-thickness plate through the acquired actual thickness;
s3, the whole roller press is provided with 20-50 sections of rollers, and the control of the positions of the rollers in each section is realized by adopting a servo electric cylinder;
s4, during rolling, calculating the required position of the section of roller in real time according to the real-time plate thickness measured by the thickness detection device and the distance between the rolling center line of the section of roller and the thickness detection point;
s5, for a variable-thickness plate with large thickness deviation, the number of position sensors can be increased, the closed-loop control servo electric cylinder can accurately meet the required position, or the rigidity of the whole roller press is increased, and in the rolling process, the control layer corrects the response of the servo electric cylinder according to the thickness change gradient.
2. The roll forming control scheme for non-uniform cross-section variable thickness members according to claim 1, wherein: in step S1, the analysis of the case of the variable-thickness plate along the length direction variable-thickness part includes the following three types: the inner wall of the part is variable in thickness, and the outer wall is straight; the outer wall of the part is variable in thickness, and the inner wall is straight; the thickness of the inner wall and the outer wall of the part is changed.
3. The roll forming control scheme for non-uniform cross-section variable thickness members according to claim 1, wherein: in step S3, the position of each segment of the roll is adjusted to be changed in real time according to the specific value of the detected thickness.
4. The roll forming control scheme for non-uniform cross-section variable thickness members according to claim 1, wherein: in step S4, the actual thickness detection accuracy is 0.01mm when the thickness detection device detects the real-time plate thickness.
5. The roll forming control scheme for non-uniform cross-section variable thickness members according to claim 1, wherein: in step S1, the actual thickness of the sheet is measured by the thickness measuring device, and the thickness of the sheet is measured while the sheet is in a slightly stretched state.
6. The roll forming control scheme for non-uniform cross-section variable thickness members according to claim 2, wherein: when the inner wall of the part is thicker and the outer wall is flat, the position of the inner side roller is changed along with the thickness change in the forming process, and the gap between the inner side roller and the outer side roller is changed due to the change of the position of the inner side roller so as to adapt to the thickness change of the part.
7. The roll forming control scheme for non-uniform cross-section variable thickness members according to claim 2, wherein: the outer wall of the part is changed in thickness, the inner wall of the part is straight, the position of the outer side roller is changed along with the thickness change in the forming process, and the gap between the inner roller and the outer roller is changed due to the change of the position of the outer side roller so as to adapt to the thickness change of the part.
8. The roll forming control scheme for non-uniform cross-section variable thickness members according to claim 1, wherein: when the thickness of the inner wall and the outer wall of the part is changed, the positions of the rollers arranged on the inner side and the outer side are changed along with the thickness change.
9. The roll forming control scheme for non-uniform cross-section variable thickness members according to claim 1, wherein: in step S5, the plate thickness variation gradient refers to a variation speed of the plate thickness in the longitudinal direction.
CN202310360947.2A 2023-04-06 2023-04-06 Rolling forming control scheme for non-uniform section variable thickness piece Pending CN116393528A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310360947.2A CN116393528A (en) 2023-04-06 2023-04-06 Rolling forming control scheme for non-uniform section variable thickness piece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310360947.2A CN116393528A (en) 2023-04-06 2023-04-06 Rolling forming control scheme for non-uniform section variable thickness piece

Publications (1)

Publication Number Publication Date
CN116393528A true CN116393528A (en) 2023-07-07

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Application Number Title Priority Date Filing Date
CN202310360947.2A Pending CN116393528A (en) 2023-04-06 2023-04-06 Rolling forming control scheme for non-uniform section variable thickness piece

Country Status (1)

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CN (1) CN116393528A (en)

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