Abstract:
The present invention relates to an online roundness correcting device for a semifinished wheel, which consists of a jacking and rotating system, a left correcting system, a right correcting system and a central locating system. According to the online roundness correcting device provided by the present invention, in service, an online roundness correcting function for the semifinished wheel can be achieved, and the corrected wheel has good roundness and cylindricity, so that not only can the labor intensity for workers be lowered, but also the online roundness correcting device has the characteristics of high degree of automation, advanced process, simple structure and safe and stable performance.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to Chinese Patent Application No. 201511006525.7, filed on Dec. 29, 2015, which is hereby incorporated by reference in its entirety. 
       TECHNICAL FIELD 
       [0002]    The present invention relates to a roundness correcting device, in particular to an online roundness correcting device for a semifinished wheel. 
       BACKGROUND ART 
       [0003]    During the heat treatment of an aluminum alloy wheel, the roundness of wheel flanges and rims will result in certain deformation due to influence caused by some factors, and the rate of finished products during machining will be seriously affected if roundness correction is not carried out. The conventional wheel roundness repairing method comprises the steps of manually holding a roundness gage with hands to find deformations, then, internally supporting the deformations forcefully with hydraulic cylinders, and carrying out approximate repair by virtue of experience, and this method has a little effect (not obvious) on wheels with roundness depressions and is not effective at all to wheels with roundness bulges. At the same time, this method is low in efficiency and high in labor intensity, the repair effect is far from ideal requirements, and the circumstance that the internal tissue of semifinished wheels is damaged due to excessive supporting probably occurs. 
       SUMMARY OF THE INVENTION 
       [0004]    An object of the present invention is to provide an online roundness correcting device for a semifinished wheel, an online roundness correcting function for the semifinished wheel can be achieved, and the corrected wheel has good roundness and cylindricity. 
         [0005]    An online roundness correcting device for a semifinished wheel comprises a jacking and rotating system, a left correcting system, a central locating system and a right correcting system. 
         [0006]    The jacking and rotating system comprises a lower servo motor, a bottom plate, guide posts, guide sleeves, a rotary shaft, a lower rising and falling plate, a large bearing block, a four-jaw chuck, radial blocks, corner cylinders and jacking hydraulic cylinders. The four guide sleeves are fixed on the bottom plate, and the four guide posts matched with the guide sleeves are fixed below the lower rising and falling plate. The two jacking hydraulic cylinders are fixed below the bottom plate, and output ends of the jacking hydraulic cylinders are hinged to the downside of the lower rising and falling plate. The large bearing block is fixed above the lower rising and falling plate, the lower servo motor is fixed below the lower rising and falling plate, and an output end of the lower servo motor is connected with the rotary shaft which is mounted in the large bearing block. The four-jaw chuck, of which four jaws are separately provided with the radial blocks and the corner cylinders, is fixed above the rotary shaft. 
         [0007]    The left correcting system comprises a left platform, a left cross guide rail I, a left sliding table, a left hydraulic cylinder I, a left vertical plate, a left gear rack, a left vertical guide rail, a left plate I, a left gear I, a left servo motor I, a left servo motor II, a left plate II, a left plate III, a left plate IV, a left hydraulic cylinder II, a left gear II, a left servo motor III, a left cross guide rail II, a left sliding plate, a left belt pulley I, a left servo motor IV, a left synchronizing belt I, left belt pulleys II, left shafts I, left bearing blocks I, left profiling rollers, a left shaft II, a left V-type roller, a left bearing block II, a left plate V, a left belt pulley III, a left synchronizing belt II and a left belt pulley IV. The left sliding table is mounted above the left platform through the left cross guide rail I, the left hydraulic cylinder I is also fixed above the left platform, and an output end of the left hydraulic cylinder I is connected with the left sliding table. The left vertical plate is fixed above the left sliding table. The left gear rack is fixed at the right side of the left vertical plate. The left plate I is mounted at the right side of the left vertical plate through the left vertical guide rail. The left plate II is fixed above the right side of the left plate I, and the left plate V is fixed below the right side of the left plate I. The left servo motor I, of which an output end is provided with the left gear I, is mounted at the right side of the left plate I. The left gear I is engaged with the left gear rack. The left servo motor II, of which an output end is provided with the left belt pulley IV, is fixed above the left plate V. The left bearing block II is also mounted above the left plate V, the left shaft II, of which the upside is provided with the left V-type roller and the downside is fixed with the left belt pulley is mounted inside the left bearing block II through a bearing, the upper end of the left shaft II is simultaneously mounted in a bearing on the left plate II, and the left belt pulley III and the left belt pulley IV are connected through the left synchronizing belt II. The left plate IV is mounted at the right side of the left vertical plate through the left vertical guide rail. The left plate III is fixed below the right side of the left plate IV. The left servo motor III, of which an output end is provided with the left gear II, is fixed at the right side of the left vertical plate, and the left gear II is engaged with the left gear rack. The left sliding plate is mounted above the left plate III through the left cross guide rail II. The left hydraulic cylinder II is also fixed above the left plate III, and an output end of the left hydraulic cylinder II is connected with the left sliding plate. The left servo motor IV, of which an output end is provided with the left belt pulley I, is fixed above the left sliding plate. The two left bearing blocks I are fixed below the left sliding plate, the two left shafts I, of which upper ends are fixed with the left belt pulleys II and lower ends are provided with the left profiling rollers, are separately mounted inside the two left bearing blocks I through bearings, and the left belt pulley I and the two left belt pulleys II are connected through the left synchronizing belt I. 
         [0008]    The central locating system comprises clamping rollers, upper guide rails, upper gear racks, upper gears, an upper rising and falling plate, upper hydraulic cylinders, upper guide posts, upper guide sleeves and a left upper sliding plate, the two clamping rollers are separately fixed below the left upper sliding plate and a right upper sliding plate, and the left upper sliding plate and the right upper sliding plate are mounted below the upper rising and falling plate through the upper guide rails. The two upper gear racks are separately fixed on the left upper sliding plate and the right upper sliding plate and are engaged with the two upper gears which are fixed below the upper rising and falling plate. The clamping cylinder is fixed below the upper rising and falling plate, and an output end of the clamping cylinder is connected with the upside of the right upper sliding plate. The four upper guide posts are fixed above the upper rising and falling plate and are matched with the four upper guide sleeves which are fixed at the top end of a machine frame. The two upper hydraulic cylinders are also fixed at the top end of the machine frame, and output ends of the two upper hydraulic cylinders are hinged to the upside of the upper rising and falling plate. 
         [0009]    The right correcting system comprises the right upper sliding plate, a clamping cylinder, a right vertical plate, a right gear rack, a right vertical guide rail, a right plate I, a right gear I, a right servo motor I, a right servo motor II, a right plate II, a right plate III, a right plate IV, a right hydraulic cylinder II, a right gear II, a right servo motor III, a right cross guide rail II, a right sliding plate, a right belt pulley I, a right servo motor IV, a right synchronizing belt I, right belt pulleys II, right shafts I, a right bearing block I, right profiling rollers, right shafts II, right V-type rollers, right bearing blocks II, a right plate V, right belt pulleys III, a right synchronizing belt II, a right belt pulley IV, a right hydraulic cylinder I, a right sliding table, a right cross guide rail I and a right platform. The right sliding table is mounted above the right platform through the right cross guide rail I. The right hydraulic cylinder I is also fixed above the right platform, and an output end of the right hydraulic cylinder I is connected with the right sliding table. The right vertical plate is fixed above the right sliding table, and the right gear rack is fixed at the left side of the right vertical plate. The right plate I is mounted at the left side of the right vertical plate through the right vertical guide rail. The right plate II is fixed above the left side of the right plate I, and the right plate V is fixed below the left side of the right plate I. The right servo motor I, of which an output end is provided with the right gear I, is mounted at the left side of the right plate I. The right gear I is engaged with the right gear rack. The right servo motor II, of which an output end is provided with the right belt pulley IV, is fixed above the right plate V. The two right bearing blocks II are also mounted above the right plate V, the two right shafts II, of which upsides are separately provided with the right V-type rollers and downsides are separately fixed with the right belt pulleys III, are mounted inside the two right bearing blocks II through bearings, upper ends of the two right shafts II are simultaneously mounted in bearings on the right plate II, and the two right belt pulleys III and the right belt pulley IV are connected through the right synchronizing belt II. The right plate IV is mounted at the left side of the right vertical plate through the right vertical guide rail. The right plate III is fixed below the left side of the right plate IV. The right servo motor III, of which an output end is provided with the right gear II, is fixed at the left side of the right plate IV, and the right gear II is engaged with the right gear rack. The right sliding plate is mounted above the right plate III through the right cross guide rail II. The right hydraulic cylinder II is also fixed above the right plate III, and an output end of the right hydraulic cylinder II is connected with the right sliding plate. The right servo motor IV, of which an output end is provided with the right belt pulley I, is fixed above the right sliding plate. The right bearing block I is fixed below the right sliding plate, the two right shafts I, of which upper ends are fixed with the right belt pulleys II and lower ends are provided with the right profiling rollers, are separately mounted inside the right bearing block I through bearings, and the right belt pulley I and the right belt pulleys II are connected through the right synchronizing belt I. 
         [0010]    During actual use, the central locating system enables a wheel on a roller way to be centrally located, the jacking hydraulic cylinders enable the four-jaw chuck to jack the wheel, the wheel is firstly located in the radial blocks and then is clamped by the four corner cylinders, and the lower servo motor can enable the clamped wheel to rotate. The right servo motor I can be used for achieving the locating of the two right V-type rollers in the height direction, the right servo motor II enables the right V-type rollers to rotate, and the right hydraulic cylinder I enables the two rotating right V-type rollers to be in contact with an outer rim of the wheel all the time and exert a supporting action. The right servo motor III is used for achieving the locating of the right profiling rollers in the height direction, the right servo motor IV enables the right profiling rollers to rotate, the right hydraulic cylinder II rightwards pulls the rotating right profiling rollers when a depression of the wheel is met, and the roundness of the depression can be recovered after the wheel rotates for a plurality of circles. The left servo motor I is used for achieving the locating of the left V-type roller in the height direction, and the left servo motor II enables the left V-type roller to rotate. The left servo motor III is used for achieving the locating of the two left profiling rollers in the height direction, the left servo motor IV drives the left profiling rollers to rotate, the left hydraulic cylinder II enables the two left profiling rollers to be in contact with an inner rim of the wheel all the time and exert a supporting action, the left hydraulic cylinder I enables the rotating left V-type roller to rightwards push a bulge of the wheel when the bulge of the wheel is met, and the roundness of the bulge can be recovered after the wheel rotates for a plurality of circles. 
         [0011]    According to the online roundness correcting device provided by the present invention, in service, the online roundness correcting function for the semifinished wheel can be achieved, and the corrected wheel has good roundness and cylindricity, so that not only can the labor intensity for workers be lowered, but also the online roundness correcting device has the characteristics of high degree of automation, advanced process, simple structure and safe and stable performance. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0012]      FIG. 1  is a front view of an online roundness correcting device for a semifinished wheel. 
           [0013]      FIG. 2  is a local left view of an online roundness correcting device for a semifinished wheel. 
           [0014]      FIG. 3  is a local right view of an online roundness correcting device for a semifinished wheel. 
           [0015]      FIG. 4  is a front view of an online roundness correcting device for a semifinished wheel during work. 
           [0016]      FIG. 5  is a top view of left and right correcting systems of an online roundness correcting device for a semifinished wheel. 
           [0017]      FIG. 6  is a top view of a jacking and rotating system of an online roundness correcting device for a semifinished wheel. 
           [0018]      FIG. 7  is a front view of a left correcting system of an online roundness correcting device for a semifinished wheel. 
           [0019]      FIG. 8  is a front view of a right correcting system of an online roundness correcting device for a semifinished wheel. 
       
    
    
       [0020]    In the figures, numeric symbols are as follows:  1 —machine frame,  2 —lower servo motor,  3 —bottom plate,  4 —guide post,  5 —guide sleeve,  6 —rotary shaft,  7 —lower rising and falling plate,  8 —large bearing block,  9 —four-jaw chuck,  10 —radial block,  11 —corner cylinder,  12 —left platform,  13 —left cross guide rail I,  14 —left sliding table,  15 —left hydraulic cylinder I,  16 —left vertical plate,  17 —left gear rack,  18 —left vertical guide rail,  19 —left plate I,  20 —left gear I,  21 —left servo motor I,  22 —left servo motor II,  23 —left plate II,  24 —left plate III,  25 —left plate IV,  26 —left hydraulic cylinder II,  27 —left gear II,  28 —left servo motor III,  29 —left cross guide rail II,  30 —left sliding plate,  31 —left belt pulley I,  32 —left servo motor IV,  33 -left synchronizing belt I,  34 —left belt pulley II,  35 —left shaft I,  36 —left bearing block I,  37 —left profiling roller,  38 —left shaft II,  39 —left V-type roller,  40 —left bearing block II,  41 —left plate V,  42 —left belt pulley III,  43 —left synchronizing belt II,  44 —left belt pulley IV,  45 —clamping roller,  46 —upper guide rail,  47 —upper gear rack,  48 —upper gear,  49 —upper rising and falling plate  49 ,  50 —upper hydraulic cylinder,  51 -upper guide post,  52 —upper guide sleeve,  53 —left upper sliding plate,  54 —right upper sliding plate,  55 —clamping cylinder,  56 —right vertical plate,  57 —right gear rack,  58 —right vertical guide rail,  59 —right plate I,  60 —right gear I,  61 —right servo motor I,  62 —right servo motor II,  63 —right plate II,  64 —right plate III,  65 —right plate IV,  66 —right hydraulic cylinder II,  67 —right gear II,  68 —right servo motor III,  69 —right cross guide rail II,  70 —right sliding plate,  71 —right belt pulley I,  72 —right servo motor IV,  73 —right synchronizing belt I,  74 —right belt pulley II,  75 —right shaft I,  76 —right bearing block I,  77 —right profiling roller,  78 -right shaft II,  79 —right V-type roller,  80 —right bearing block II,  81 —right plate V,  82 —right belt pulley III,  83 —right synchronizing belt II,  84 —right belt pulley IV,  85 —right hydraulic cylinder I,  86 —right sliding table,  87 —right cross guide rail I,  88 —right platform and  89 —jacking hydraulic cylinder. 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0021]    In the following, the details and working conditions of a specific device provided by the present invention are described in combination with the figures. 
         [0022]    An online roundness correcting device for a semifinished wheel comprises a jacking and rotating system, a left correcting system, a central locating system and a right correcting system. 
         [0023]    The jacking and rotating system comprises a lower servo motor  2 , a bottom plate  3 , guide posts  4 , guide sleeves  5 , a rotary shaft  6 , a lower rising and falling plate  7 , a large bearing block  8 , a four-jaw chuck  9 , radial blocks  10 , corner cylinders  11  and jacking hydraulic cylinders  89 . The four guide sleeves  5  are fixed on the bottom plate  3 , and the four guide posts  4  matched with the guide sleeves  5  are fixed below the lower rising and falling plate  7 . The two jacking hydraulic cylinders  89  are fixed below the bottom plate  3 , and output ends of the jacking hydraulic cylinders  89  are hinged to the downside of the lower rising and falling plate  7 . The large bearing block  8  is fixed above the lower rising and falling plate  7 , the lower servo motor  2  is fixed below the lower rising and falling plate  7 , and an output end of the lower servo motor  2  is connected with the rotary shaft  6  which is mounted in the large bearing block  8 . The four-jaw chuck  9 , of which four jaws are separately provided with the radial blocks  10  and the corner cylinders  11 , is fixed above the rotary shaft  6 . 
         [0024]    The left correcting system comprises a left platform  12 , a left cross guide rail I  13 , a left sliding table  14 , a left hydraulic cylinder I  15 , a left vertical plate  16 , a left gear rack  17 , a left vertical guide rail  18 , a left plate I  19 , a left gear I  20 , a left servo motor I  21 , a left servo motor II  22 , a left plate II  23 , a left plate III  24 , a left plate IV  25 , a left hydraulic cylinder II  26 , a left gear II  27 , a left servo motor III  28 , a left cross guide rail II  29 , a left sliding plate  30 , a left belt pulley I  31 , a left servo motor IV  32 , a left synchronizing belt I  33 , left belt pulleys II  34 , left shafts I  35 , left bearing blocks I  36 , left profiling rollers  37 , a left shaft II  38 , a left V-type roller  39 , a left bearing block II  40 , a left plate V  41 , a left belt pulley III  42 , a left synchronizing belt II  43  and a left belt pulley IV  44 . The left sliding table  14  is mounted above the left platform  12  through the left cross guide rail I  13 , the left hydraulic cylinder I  15  is also fixed above the left platform  12 , and an output end of the left hydraulic cylinder I  15  is connected with the left sliding table  14 . The left vertical plate  16  is fixed above the left sliding table  14 . The left gear rack  17  is fixed at the right side of the left vertical plate  16 . The left plate I  19  is mounted at the right side of the left vertical plate  16  through the left vertical guide rail  18 . The left plate II  23  is fixed above the right side of the left plate I  19 , and the left plate V  41  is fixed below the right side of the left plate I  19 . The left servo motor I  21 , of which an output end is provided with the left gear I  20 , is mounted at the right side of the left plate I  19 . The left gear I  20  is engaged with the left gear rack  17 . The left servo motor II  22 , of which an output end is provided with the left belt pulley IV  44 , is fixed above the left plate V  41 . The left bearing block II  40  is also mounted above the left plate V  41 , the left shaft II  38 , of which the upside is provided with the left V-type roller  39  and the downside is fixed with the left belt pulley III  42 , is mounted inside the left bearing block II  40  through a bearing, the upper end of the left shaft II  38  is simultaneously mounted in a bearing on the left plate II  23 , and the left belt pulley III  42  and the left belt pulley IV  44  are connected through the left synchronizing belt II  43 . The left plate IV  25  is mounted at the right side of the left vertical plate  16  through the left vertical guide rail  18 . The left plate III  24  is fixed below the right side of the left plate IV  25 . The left servo motor III  28 , of which an output end is provided with the left gear II  27 , is fixed at the right side of the left vertical plate  16 , and the left gear II  27  is engaged with the left gear rack  17 . The left sliding plate  30  is mounted above the left plate III  24  through the left cross guide rail II  29 . The left hydraulic cylinder II  26  is also fixed above the left plate III  24 , and an output end of the left hydraulic cylinder II  26  is connected with the left sliding plate  30 . The left servo motor IV  32 , of which an output end is provided with the left belt pulley I  31 , is fixed above the left sliding plate  30 . The two left bearing blocks I  36  are fixed below the left sliding plate  30 , the two left shafts I  35 , of which upper ends are fixed with the left belt pulleys II  34  and lower ends are provided with the left profiling rollers  37 , are separately mounted inside the two left bearing blocks I  36  through bearings, and the left belt pulley I  31  and the two left belt pulleys II  34  are connected through the left synchronizing belt I  33 . 
         [0025]    The central locating system comprises clamping rollers  45 , upper guide rails  46 , upper gear racks  47 , upper gears  48 , an upper rising and falling plate  49 , upper hydraulic cylinders  50 , upper guide posts  51 , upper guide sleeves  52  and a left upper sliding plate  53 . The two clamping rollers  45  are separately fixed below the left upper sliding plate  53  and a right upper sliding plate  54 , and the left upper sliding plate  53  and the right upper sliding plate  54  are mounted below the upper rising and falling plate  49  through the upper guide rails  46 . The two upper gear racks  47  are separately fixed on the left upper sliding plate  53  and the right upper sliding plate  54  and are engaged with the two upper gears  48  which are fixed below the upper rising and falling plate  49 . The clamping cylinder  55  is fixed below the upper rising and falling plate  49 , and an output end of the clamping cylinder  55  is connected with the upside of the right upper sliding plate  54 . The four upper guide posts  51  are fixed above the upper rising and falling plate  49  and are matched with the four upper guide sleeves  52  which are fixed at the top end of a machine frame  1 . The two upper hydraulic cylinders  50  are also fixed at the top end of the machine frame  1 , and output ends of the two upper hydraulic cylinders  50  are hinged to the upside of the upper rising and falling plate  49 . 
         [0026]    The right correcting system comprises the right upper sliding plate  54 , a clamping cylinder  55 , a right vertical plate  56 , a right gear rack  57 , a right vertical guide rail  58 , a right plate I  59 , a right gear I  60 , a right servo motor I  61 , a right servo motor II  62 , a right plate II  63 , a right plate III  64 , a right plate IV  65 , a right hydraulic cylinder II  66 , a right gear II  67 , a right servo motor III  68 , a right cross guide rail II  69 , a right sliding plate  70 , a right belt pulley I  71 , a right servo motor IV  72 , a right synchronizing belt I  73 , right belt pulleys II  74 , right shafts I  75 , a right bearing block I  76 , right profiling rollers  77 , right shafts II  78 , right V-type rollers  79 , right bearing blocks II  80 , a right plate V  81 , right belt pulleys III  82 , a right synchronizing belt II  83 , a right belt pulley IV  84 , a right hydraulic cylinder I  85 , a right sliding table  86 , a right cross guide rail I  87  and a right platform  88 . The right sliding table  86  is mounted above the right platform  88  through the right cross guide rail I  87 . The right hydraulic cylinder I  85  is also fixed above the right platform  88 , and an output end of the right hydraulic cylinder I  85  is connected with the right sliding table  86 . The right vertical plate  56  is fixed above the right sliding table  86 , and the right gear rack  57  is fixed at the left side of the right vertical plate  56 . The right plate I  59  is mounted at the left side of the right vertical plate  56  through the right vertical guide rail  58 . The right plate II  63  is fixed above the left side of the right plate I  59 , and the right plate V  81  is fixed below the left side of the right plate I  59 . The right servo motor I  61 , of which an output end is provided with the right gear I  60 , is mounted at the left side of the right plate I  59 . The right gear I  60  is engaged with the right gear rack  57 . The right servo motor II  62 , of which an output end is provided with the right belt pulley IV  84 , is fixed above the right plate V  81 . The two right bearing blocks II  80  are also mounted above the right plate V  81 , the two right shafts II  78 , of which upsides are separately provided with the right V-type rollers  79  and downsides are separately fixed with the right belt pulleys III  82 , are mounted inside the two right bearing blocks II  80  through bearings, upper ends of the two right shafts II  78  are simultaneously mounted in bearings on the right plate II  63 , and the two right belt pulleys III  82  and the right belt pulley IV  84  are connected through the right synchronizing belt II  83 . The right plate IV  65  is mounted at the left side of the right vertical plate  56  through the right vertical guide rail  58 . The right plate III  64  is fixed below the left side of the right plate IV  65 . The right servo motor III  68 , of which an output end is provided with the right gear II  67 , is fixed at the left side of the right plate IV  65 , and the right gear II  67  is engaged with the right gear rack  57 . The right sliding plate  70  is mounted above the right plate III  64  through the right cross guide rail II  69 . The right hydraulic cylinder II  66  is also fixed above the right plate III  64 , and an output end of the right hydraulic cylinder II  66  is connected with the right sliding plate  70 . The right servo motor IV  72 , of which an output end is provided with the right belt pulley I  71 , is fixed above the right sliding plate  70 . The right bearing block I  76  is fixed below the right sliding plate  70 , the two right shafts I  75 , of which upper ends are fixed with the right belt pulleys II  74  and lower ends are provided with the right profiling rollers  77 , are separately mounted inside the right bearing block I  76  through bearings, and the right belt pulley I  71  and the right belt pulleys II  74  are connected through the right synchronizing belt I  73 . 
         [0027]    During work, the central locating system enables a wheel on a roller way to be centrally located, the jacking hydraulic cylinders  89  enable the four-jaw chuck  9  to jack the wheel, the wheel is firstly located in the radial blocks  10  and then is clamped by the four corner cylinders  11 , and the lower servo motor  2  can enable the clamped wheel to rotate. The right servo motor I  61  can be used for achieving the locating of the two right V-type rollers  79  in the height direction, the right servo motor II  62  enables the right V-type rollers  79  to rotate, and the right hydraulic cylinder I  85  enables the two rotating right V-type rollers  79  to be in contact with an outer rim of the wheel all the time and exert a supporting action. The right servo motor III  68  is used for achieving the locating of the right profiling rollers  77  in the height direction, the right servo motor IV  72  enables the right profiling rollers  77  to rotate, the right hydraulic cylinder II  66  rightwards pulls the rotating right profiling rollers  77  when a depression of the wheel is met, and the roundness of the depression can be recovered after the wheel rotates for a plurality of circles. The left servo motor I  21  is used for achieving the locating of the left V-type roller  39  in the height direction, and the left servo motor II  22  enables the left V-type roller  39  to rotate. The left servo motor III  28  is used for achieving the locating of the two left profiling rollers  37  in the height direction, the left servo motor IV  32  drives the left profiling rollers  37  to rotate, the left hydraulic cylinder II  26  enables the two left profiling rollers  37  to be in contact with an inner rim of the wheel all the time and exert a supporting action, the left hydraulic cylinder I  15  enables the rotating left V-type roller  39  to rightwards push a bulge of the wheel when the bulge of the wheel is met, and the roundness of the bulge can be recovered after the wheel rotates for a plurality of circles. 
         [0028]    The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.