阅读说明：本技术 一种螺栓球坯球体连续局部塑性成形装置与方法 (Continuous local plastic forming device and method for bolt ball blank sphere ) 是由 张建忠 向洋洋 邢宏凯 王浩 翟梓彬 王海博 张诗绮 魏麟蘅 于 2021-07-15 设计创作，主要内容包括：本发明涉及螺栓球坯成型技术领域,具体公开了一种螺栓球坯球体连续局部塑性成形装置,包括支撑辊、压辊、主驱动电机、横向进给液压马达以及竖向进给液压缸,所述支撑辊、压辊均成对设置,支撑辊为圆柱形结构,并排安装在立框底部；所述支撑辊由主驱动电机驱动,所述横向进给液压马达设置在立框侧面,竖向进给液压缸设置在立框顶部；所述立框内侧设置有竖向滑台,在竖向滑台上设置有第一横向滑台和第二横向滑台,两组压辊分别设置在第一横向滑台和第二横向滑台上；所述竖向滑台由竖向进给液压缸驱动,第一横向滑台和第二横向滑台由横向进给液压马达驱动；本发明实现在较小的力作用下实现变形,进而实现设备的小型化,提高球体的几何精度。(The invention relates to the technical field of bolt ball blank forming, and particularly discloses a continuous local plastic forming device for a bolt ball blank sphere, which comprises a supporting roll, a pressing roll, a main driving motor, a transverse feeding hydraulic motor and a vertical feeding hydraulic cylinder, wherein the supporting roll and the pressing roll are arranged in pairs, and the supporting roll is of a cylindrical structure and is arranged at the bottom of a vertical frame side by side; the supporting roller is driven by a main driving motor, the transverse feeding hydraulic motor is arranged on the side face of the vertical frame, and the vertical feeding hydraulic cylinder is arranged at the top of the vertical frame; a vertical sliding table is arranged on the inner side of the upright frame, a first transverse sliding table and a second transverse sliding table are arranged on the vertical sliding table, and two groups of press rollers are respectively arranged on the first transverse sliding table and the second transverse sliding table; the vertical sliding table is driven by a vertical feeding hydraulic cylinder, and the first transverse sliding table and the second transverse sliding table are driven by a transverse feeding hydraulic motor; the invention realizes deformation under the action of smaller force, thereby realizing miniaturization of equipment and improving the geometric precision of the sphere.)

1. The utility model provides a continuous local plasticity forming device of bolt ball base spheroid which characterized in that: the device comprises a supporting roll (1), a pressing roll (2), a main driving motor (3), a transverse feeding hydraulic motor (4) and a vertical feeding hydraulic cylinder (5), wherein the supporting roll (1) and the pressing roll (2) are arranged in pairs, and the supporting roll (1) is of a cylindrical structure and is arranged at the bottom of a vertical frame (8) side by side; the supporting roller (1) is driven by a main driving motor (3), the transverse feeding hydraulic motor (4) is arranged on the side surface of the vertical frame (8), and the vertical feeding hydraulic cylinder (5) is arranged at the top of the vertical frame (8); a vertical sliding table (9) is arranged on the inner side of the vertical frame (8), a first transverse sliding table (12) and a second transverse sliding table (13) are arranged on the vertical sliding table (9), and two groups of compression rollers (2) are respectively arranged on the first transverse sliding table (12) and the second transverse sliding table (13); the vertical sliding table (9) is driven by a vertical feeding hydraulic cylinder (5), and the first transverse sliding table (12) and the second transverse sliding table (13) are driven by a transverse feeding hydraulic motor (4); the cross section of the compression roller (2) is in an arc profile with the diameter of a bolt ball blank, the vertical frame (8) is fixed on the base (7), and the compression roller (2) is arranged in the middle of the two support rollers (1); the first transverse sliding table (12) and the second transverse sliding table (13) are respectively provided with an accelerometer, and the accelerometers are electrically connected with the controller.

2. The continuous local plastic forming device for the bolt ball blank sphere according to claim 1, characterized in that: the output end of the main driving motor (3) is provided with a gear distributor (11), the gear distributor (11) is provided with two output shafts, and the two output shafts are respectively connected with the two supporting rollers (1) through a coupler (10); the main driving motor (3) is electrically connected with the controller.

3. The continuous local plastic forming device for the bolt ball blank sphere according to claim 1, characterized in that: the top ends of the two groups of compression rollers (2) are connected with compression roller driving hydraulic motors (6), and the two groups of compression roller driving hydraulic motors (6) are respectively fixed with the first transverse sliding table (12) and the second transverse sliding table (13); and the compression roller driving hydraulic motor (6) is electrically connected with the controller.

4. The continuous local plastic forming device for the bolt ball blank sphere according to claim 1, characterized in that: the screw rod (14) is sleeved between the first transverse sliding table (12) and the second transverse sliding table (13) in a matched mode, one end of the screw rod (14) is connected with the transverse feeding hydraulic motor (4), and symmetrical thread structures are arranged on the screw rod (14).

5. The continuous local plastic forming device for the bolt ball blank sphere according to claim 1, characterized in that: the transverse feeding hydraulic motor (4) and the vertical feeding hydraulic cylinder (5) are both electrically connected with the controller, and hydraulic systems of the transverse feeding hydraulic motor (4) and the vertical feeding hydraulic cylinder (5) are both provided with pressure sensors which are electrically connected with the controller.

6. A continuous local plastic forming method for a bolt ball blank sphere is characterized by comprising the following steps: the method comprises the following steps:

s1: the blank is placed between two supporting rollers (1), and a main driving motor (3) is started to drive the supporting rollers (1) and the blank to rotate;

s2: the position of a vertical sliding table (9) is adjusted through a vertical feeding hydraulic cylinder (5), and the positions of a first transverse sliding table (12) and a second transverse sliding table (13) are adjusted through a transverse feeding hydraulic motor (4), so that the press rolls (2) move to the two ends of the blank and are in contact with the blank;

s3: the compression rollers (2) approach to each other and gradually rise, move along the guide line, and judge the left-right symmetry of the blank through the numerical feedback of the accelerometer;

s4: continuously detecting the left-right symmetry of the blank in the machining process, and controlling the left-right symmetry of the blank;

s5: by adjusting the pressure supply of the transverse feeding hydraulic motor (4) and the vertical feeding hydraulic cylinder (5), the contact area of the press roll (2) and the blank is gradually enlarged, and an ellipse is gradually formed, and finally a spherical blank is formed.

7. The continuous local plastic forming method of a bolt ball blank sphere according to claim 6, characterized in that: in the step S3, the guide line takes the contact between the pressing roller (2) and the cylindrical blank as a starting point and takes the gradual forming of the pressing roller (2) into a spherical shape under the vertical and horizontal driving as an end point; the guide line is obtained by finite element theoretical calculation or by experiment under the conditions of continuous rotation and plastic deformation of the blank.

8. The continuous local plastic forming method of a bolt ball blank sphere according to claim 6, characterized in that: in the step S4, the pressure of the vertical feeding hydraulic cylinder (5) and the vertical sliding table (9) is increased, so that the two ends of the blank are downward and act together with the supporting roller (1); the left and right symmetrical shape is formed gradually in the blank rolling process.

Technical Field

The invention relates to the technical field of bolt ball blank forming, in particular to a continuous local plastic forming device and method for a bolt ball blank sphere.

Background

The existing bolt ball blank manufacturing adopts a cylindrical bar material to be sawed and heated to an austenite temperature area, and then hot hammer forging processing is carried out.

Local folds caused by the hot hammer forging process are difficult to eliminate, fine crack defects in the blank ball are inevitable, and potential safety hazards are caused when the blank ball is used in a space grid structure because cracks are gradually expanded under certain stress conditions to become local damage factors; another practical problem is that as the environment of the forger is poor, the requirements of technology and physical strength are extremely high, and as the social living standard is improved, the young people are much reluctant to do the work, the phenomenon of technical talent gear-off has already appeared, and the trend is expected to be increasingly obvious and irreversible; the blank sphericity index of the die forging method is too large and reaches more than 2-3 mm, so that a positioning gap of a bolt ball in numerical control machining has to be moved outwards to avoid the phenomenon of cutter collision, the idle cutter stroke is increased, the efficiency of numerical control machining is seriously reduced, and the reason is mainly that the performance of controlling the geometric form of a die is remarkably reduced due to severe abrasion of certain areas of the die in the process of hammer forging.

Another method for processing the ball is to use the rolling technology such as skew rolling or longitudinal rolling to form the ball in a plastic way, but because of the mannesmann effect of the three-way tensile stress in the area close to the spherical surface in the rotating direction, especially the ball with more than 50mm has internal cracks or loose phenomena in the two polar areas, the ball can generate serious safety problems when being used for structural members, so that the ball can only be applied to the field of non-structural members such as ball milling balls.

Disclosure of Invention

The invention aims to provide a continuous local plastic forming device and a method for a bolt ball blank sphere, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a continuous local plastic forming device for a bolt ball blank sphere comprises a supporting roll, a pressing roll, a main driving motor, a transverse feeding hydraulic motor and a vertical feeding hydraulic cylinder, wherein the supporting roll and the pressing roll are arranged in pairs, and the supporting roll is of a cylindrical structure and is arranged at the bottom of a vertical frame side by side; the supporting roller is driven by a main driving motor, the transverse feeding hydraulic motor is arranged on the side face of the vertical frame, and the vertical feeding hydraulic cylinder is arranged at the top of the vertical frame; a vertical sliding table is arranged on the inner side of the upright frame, a first transverse sliding table and a second transverse sliding table are arranged on the vertical sliding table, and two groups of press rollers are respectively arranged on the first transverse sliding table and the second transverse sliding table; the vertical sliding table is driven by a vertical feeding hydraulic cylinder, and the first transverse sliding table and the second transverse sliding table are driven by a transverse feeding hydraulic motor; the cross section of the compression roller is in an arc profile with the diameter of the bolt ball blank, the vertical frame is fixed on the base, and the compression roller is arranged between the two supporting rollers; the first transverse sliding table and the second transverse sliding table are respectively provided with an accelerometer, and the accelerometers are electrically connected with the controller.

Preferably, the output end of the main driving motor is provided with a gear distributor, the gear distributor is provided with two output shafts, and the two output shafts are respectively connected with the two supporting rollers through couplers; the main driving motor is electrically connected with the controller.

Preferably, the top ends of the two groups of compression rollers are connected with compression roller driving hydraulic motors, and the two groups of compression roller driving hydraulic motors are respectively fixed with the first transverse sliding table and the second transverse sliding table; and the compression roller driving hydraulic motor is electrically connected with the controller.

Preferably, a screw rod is sleeved between the first transverse sliding table and the second transverse sliding table in a matched mode, one end of the screw rod is connected with the transverse feeding hydraulic motor, and symmetrical thread structures are arranged on the screw rod.

Preferably, the transverse feeding hydraulic motor and the vertical feeding hydraulic cylinder are both electrically connected with the controller, and hydraulic systems of the transverse feeding hydraulic motor and the vertical feeding hydraulic cylinder are both provided with pressure sensors which are electrically connected with the controller.

Preferably, the invention also provides a continuous local plastic forming method of the bolt ball blank sphere, which comprises the following steps:

s1: the blank is placed between two supporting rollers, and a main driving motor is started to drive the supporting rollers and the blank to rotate;

s2: the position of the vertical sliding table is adjusted through a vertical feeding hydraulic cylinder, and the positions of the first transverse sliding table and the second transverse sliding table are adjusted through a transverse feeding hydraulic motor, so that the press roller moves to two ends of the blank and is in contact with the blank;

s3: the press rollers approach to each other and gradually rise, move along the guide line, and judge the bilateral symmetry of the blank through the numerical feedback of the accelerometer;

s4: continuously detecting the left-right symmetry of the blank in the machining process, and controlling the left-right symmetry of the blank;

s5: by adjusting the pressure supply of the transverse feeding hydraulic motor and the vertical feeding hydraulic cylinder, the contact area of the press roll and the blank is gradually enlarged, and an ellipse is gradually formed, thus finally forming a spherical blank.

Preferably, in step S3, the guide line takes the contact between the pressing roller and the cylindrical blank as a starting point, and takes the gradual forming of the pressing roller into a spherical shape under the vertical and horizontal driving as an end point; the guide line is obtained by finite element theoretical calculation or by experiment under the conditions of continuous rotation and plastic deformation of the blank.

Preferably, in the step S4, the pressures of the vertical feeding hydraulic cylinder and the vertical sliding table are increased, so that the two ends of the blank are downward and cooperate with the supporting roller; the left and right symmetrical shape is formed gradually in the blank rolling process.

Compared with the prior art, the invention has the beneficial effects that: the invention adopts a continuous local plastic processing scheme, which can effectively reduce plastic deformation conditions, realize deformation under the action of smaller force, further realize miniaturization of equipment, and the pressure required by plastic deformation is 1/20-1/50 of a hammer forging process; and automatic processing can be realized through a control method, so that the industry can accept the method at lower cost, and meanwhile, the compression roller profile is also used for controlling forming, so that the sphericity is ensured, and the geometric precision of the ball body is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the transverse ramp installation of the present invention;

FIG. 3 is a schematic front view of a process according to an embodiment of the present invention;

FIG. 4 is a schematic side view of a process according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a variation of the present invention;

FIG. 6 is a schematic view of a guide wire according to an embodiment of the present invention;

FIG. 7 is a schematic view of a second embodiment of the present invention;

reference numbers in the figures: 1. a support roller; 2. a compression roller; 3. a main drive motor; 4. a cross-feed hydraulic motor; 5. a vertical feed hydraulic cylinder; 6. the compression roller drives a hydraulic motor; 7. a base; 8. erecting a frame; 9. a vertical sliding table; 10. a coupling; 11. a gear distributor; 12. a first transverse sliding table; 13. a second transverse sliding table; 14. and a screw rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1-7, the present invention provides a technical solution: a continuous local plastic forming device for a bolt ball blank sphere comprises a supporting roll 1, a pressing roll 2, a main driving motor 3, a transverse feeding hydraulic motor 4 and a vertical feeding hydraulic cylinder 5, wherein the supporting roll 1 and the pressing roll 2 are arranged in pairs, and the supporting roll 1 is of a cylindrical structure and is arranged at the bottom of a vertical frame 8 side by side; the supporting roller 1 is driven by a main driving motor 3, the transverse feeding hydraulic motor 4 is arranged on the side surface of the vertical frame 8, and the vertical feeding hydraulic cylinder 5 is arranged at the top of the vertical frame 8; a vertical sliding table 9 is arranged on the inner side of the upright frame 8, a first transverse sliding table 12 and a second transverse sliding table 13 are arranged on the vertical sliding table 9, and two groups of compression rollers 2 are respectively arranged on the first transverse sliding table 12 and the second transverse sliding table 13; the vertical sliding table 9 is driven by a vertical feeding hydraulic cylinder 5, and the first transverse sliding table 12 and the second transverse sliding table 13 are driven by a transverse feeding hydraulic motor 4; the cross section of the compression roller 2 is in an arc profile with the diameter of a bolt ball blank, the vertical frame 8 is fixed on the base 7, and the compression roller 2 is arranged between the two support rollers 1; the first transverse sliding table 12 and the second transverse sliding table 13 are respectively provided with an accelerometer, and the accelerometers are electrically connected with the controller.

Further, a gear distributor 11 is arranged at the output end of the main driving motor 3, the gear distributor 11 is provided with two output shafts, and the two output shafts are respectively connected with the two supporting rollers 1 through a coupler 10; the main driving motor 3 is electrically connected with the controller.

Further, the top ends of the two groups of compression rollers 2 are connected with compression roller driving hydraulic motors 6, and the two groups of compression roller driving hydraulic motors 6 are respectively fixed with the first transverse sliding table 12 and the second transverse sliding table 13; the compression roller driving hydraulic motor 6 is electrically connected with the controller.

Further, a screw rod 14 is sleeved between the first transverse sliding table 12 and the second transverse sliding table 13 in a matched mode, one end of the screw rod 14 is connected with the transverse feeding hydraulic motor 4, and symmetrical thread structures are arranged on the screw rod 14.

Further, the transverse feeding hydraulic motor 4 and the vertical feeding hydraulic cylinder 5 are both electrically connected with the controller, and hydraulic systems of the transverse feeding hydraulic motor 4 and the vertical feeding hydraulic cylinder 5 are both provided with pressure sensors which are electrically connected with the controller.

Further, the invention also provides a continuous local plastic forming method of the bolt ball blank sphere, which comprises the following steps:

s1: the blank is placed between two supporting rollers 1, and a main driving motor 3 is started to drive the supporting rollers 1 and the blank to rotate;

s2: the position of the vertical sliding table 9 is adjusted through a vertical feeding hydraulic cylinder 5, and the positions of a first transverse sliding table 12 and a second transverse sliding table 13 are adjusted through a transverse feeding hydraulic motor 4, so that the press roller 2 moves to two ends of a blank and is in contact with the blank;

s3: the press rollers 2 approach each other and gradually rise, move along the guide line, and judge the bilateral symmetry of the blank through the numerical feedback of the accelerometer;

s4: continuously detecting the left-right symmetry of the blank in the machining process, and controlling the left-right symmetry of the blank;

s5: by adjusting the pressure supply of the transverse feeding hydraulic motor 4 and the vertical feeding hydraulic cylinder 5, the contact area of the press roll 2 and the blank is gradually enlarged, and an ellipse is gradually formed, and finally a spherical blank is formed.

Further, in the step S3, the guide line takes the contact between the pressing roller 2 and the cylindrical blank as a starting point, and takes the gradual forming of the pressing roller 2 into a spherical shape under the vertical and horizontal driving as an end point; the guide line is obtained by finite element theoretical calculation or by experiment under the conditions of continuous rotation and plastic deformation of the blank.

Further, in the step S4, the pressures of the vertical feeding hydraulic cylinder 5 and the vertical sliding table 9 are increased, so that the two ends of the blank are downward and act together with the supporting roller 1; the left and right symmetrical shape is formed gradually in the blank rolling process.

The first embodiment is as follows:

placing cylindrical blanks on two cylindrical supporting rollers 1 which are completely identical in shape and symmetrically arranged, transmitting main rotating power to the supporting rollers 1 through a gear distributor 11 and a universal coupling 10 by using a main driving motor 3, and driving the blanks to rotate by using the friction force between the supporting rollers 1 and the blanks as driving force; the position of a press roll 2 with an arc profile of the diameter of a bolt ball blank is determined by the positions of a first transverse sliding table 12, a second transverse sliding table 13 and a vertical sliding table 9, the vertical sliding table 9 is driven by a vertical feeding hydraulic cylinder 5, the left and right transverse sliding tables are symmetrically moved by a screw rod 14 and a transverse feeding driving hydraulic motor 4, the transverse and vertical movements of the press roll 2 drive the blank to be in contact with the press roll 2 and a support roll 1 and generate plastic deformation, and thus, the structure shown in figures 3 and 4 is formed in principle.

And controlling the vertical feeding hydraulic cylinder 5 and the transverse feeding hydraulic motor 4, controlling the pressure and the position of the pressing roller 2 in the vertical sliding table 9, the first transverse sliding table 12 and the second transverse sliding table 13 on the blank, and continuously and locally plastically deforming the blank in the rotating process and gradually forming the blank as shown in figure 5.

Taking the contact between the compression roller 2 and the cylindrical blank as a starting point, and gradually forming the compression roller 2 into a spherical shape under vertical and horizontal driving as an end point to form a guide line as shown in figure 6; the guide line can be obtained by finite element theoretical calculation or by experiment under the condition of continuous rotation and plastic deformation of the blank. The guide line is used as a control curve to control the proportional relation between the transverse pressure and the vertical pressure, so that the motion trail of the press roller 2 is used as a control target and can be obtained by a vertical position sensor and a transverse position sensor.

The calculation process of the guideline is:

assuming that the forming process is stable and completely bilaterally symmetrical and that the contact areas are not linked to each other, considering the equivalent movement, starting from fig. 6 with the bottom surface of the press roll 2 collinear with the central axis of the billet, the billet is not moved in the feed direction (both transverse and vertical) (only rotation and plastic deformation of the billet), the press roll 2 moves transversely to extrude the billet, the billet rotation moves the deformation area down to press the support roll 1, i.e. the movement of the press roll 2 can be interpreted as the transverse movement of the press roll 2 and the vertical movement of the support roll 1, thus decoupling the plastic deformation area into three parts:

1. in the contact deformation area between the compression roller 2 and the cylindrical blank, the transverse feeding amount of each circle of blank rotation is taken as a load condition, the symmetry boundary condition is considered, and the deformation and the force are calculated by using a plastic finite element;

2. in a contact deformation area between the support roller 1 and the deformed blank, the vertical component force calculated in the previous step is used as a loading condition, meanwhile, the displacement of the support roller 1 is calculated, downward displacement is obtained through the current geometric condition (support angle), and the displacement is used as the position change generated by each rotation in the vertical direction;

3. in the contact deformation area of the other supporting roller 1 and the blank, the symmetry of the support is considered, the calculation result shows that the change is not large, and the step can be considered to be ignored.

And (3) obtaining deformation displacement points of the first step in the X and Y directions through the calculation, then, gradually loading the calculated model according to the steps, and respectively calculating displacement points until the displacement points are close to the last forming point of the sphere. It is to be noted that this calculation is only valid for sufficiently small step sizes, i.e. when the feed per turn does not exceed a certain value, the actual process is interpreted as the rotation speed being sufficiently high or the loading force being sufficiently low for shaping.

Assuming that the deformation of the blank is symmetrical left and right, only one side of the deformation is considered, as shown in fig. 6, a guide line polynomial equation which is calculated and subjected to coordinate transformation is used as a control program judgment basis of an industrial control computer, and the position of the rotation center of the upper end of the current press roll 2 is judged through a sensor: if the pressure roller is arranged below the guide line, the oil pressure of the vertical feeding hydraulic cylinder 5 can be reduced, the vertical force can be reduced, the oil pressure of the transverse feeding hydraulic motor 4 can be kept, the feeding of the pressure roller 2 on the XY plane approaches the guide line along the direction forming an acute angle with the tangent direction of the guide line, and the horizontal direction and the vertical direction can be simultaneously reduced to increase the correction effect; also, if above the guide line, the vertical force can be increased by increasing the oil pressure of the vertical feed hydraulic cylinder 5, gradually approaching the guide line in a direction at an acute angle to the tangent direction of the guide line. Continuously detecting deviation and feeding and correcting by changing transverse and vertical forces to form closed-loop control and gradually forming.

Example two:

in this embodiment, the blank has a left-right asymmetric structure, and the rest is the same as that in the first embodiment.

As shown in fig. 7, when the asymmetry degree of the contact areas between the left and right pressing rolls 2 and the blank is increased to a certain degree, an unstable phenomenon occurs, the asymmetry degree is amplified without adjusting and continuously processing, and the deformation of the blank is not converged, which is caused by the fact that the stress asymmetry cannot be absorbed by the symmetrical feeding of the pressing rolls 2 due to the excessive deformation asymmetry and the stress asymmetry degree is gradually amplified along with the increase of the deformation, specifically reflecting that the vibration of the mechanism is increased, and the driving force is significantly improved. The phenomenon can be detected by an accelerometer, the accelerometers are respectively arranged on the first transverse sliding table 12 and the second transverse sliding table 13 of the press roll, a threshold value exceeding an asymmetric limit is determined by an experimental method, a measured value is transmitted to a control program at intervals (such as 0.1-1 second) in the machining process, if the numerical value exceeds the threshold value, bilateral symmetry stability control is started, otherwise, the control is carried out according to the guide line.

The method for increasing the bilateral symmetry stability is to improve the pressure F of the vertical feeding hydraulic cylinder 5 and the vertical sliding table 9, so that two ends of the blank 15 are downward and act together with the supporting roller 1, and most of the pressure is borne at the part with a larger contact area (higher than the other vertical end), so that the material of the asymmetric convex part in the blank flows to the middle part along the surface of the blank due to a plastic flow principle, and gradually forms a bilateral symmetry shape in the rolling process of the blank, if the measured vibration still exceeds a threshold value, the pressure value is continuously increased, so that the bilateral symmetry degree is increased, and the material of the asymmetric part is substantially driven to the middle area. When the measured vibration value is below the threshold value, a continuous plastic deformation control scheme is performed using the aforementioned guideline control method.

It is worth noting that: the whole device realizes control over the device through the master control button, and the device matched with the control button is common equipment, belongs to the existing mature technology, and is not repeated for the electrical connection relation and the specific circuit structure.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.