Railway wheel boring machine for machining railway wheel hub hole

Abstract

The utility model relates to a boring machine for a railway wheel, which is used for machining a hub hole of the railway wheel. A railway wheel boring machine for machining a hole (16) in a hub (15) of a railway wheel (10) comprises a base (101), a column (102), a working head (103) sliding on the column (102), a rotating boring bar (104) arranged on the working head (103), and a non-rotating clamping plate (105) having a clamping unit (106) for clamping and centering the railway wheel (10), the clamping unit comprises at least three jaws (118) moving along a linear path (T) converging at the center (C ') of the non-rotating clamping plate (105), each jaw being attached to a transfer bar (119) having a first end (120) attached to the jaws (118) and a second end (121) attached to a swivel ring (122) driven by an actuator (123), the actuator (123) being configured to actuate the jaws (118) in the non-rotating clamping plate (105). The actuator (123) rotates the swivel ring (122) to drive the transfer bar (119) and move the jaw (118) to secure the railway wheel (10).

Description

Technical Field

[0001] The utility model relates to a railway wheel boring machine for machining the hub holes of railway wheels. Background Art

[0002] Railway wheels are one of the components that bear the greatest loads during the operation of rail vehicles. Therefore, a secure connection between the wheel and the axle through shrink fit is crucial for the safety of rail transportation. Thus, high machining precision is required for the hub holes of railway wheels that connect to the axle.

[0003] Traditionally, railway wheel hub holes were machined on vertical lathes, where the wheel was fixed in a rotating clamping plate that drove the wheel to rotate, and a cutting tool arranged in the working head of the lathe machined the wheel hub hole while the wheel was rotating. This vertical lathe was used for various machining tasks and refurbishment processes of railway wheels, so it was a multi-functional machine tool, but it was expensive and in some cases could not meet the current high-precision requirements for wheel hole machining in the railway industry. Therefore, to complete this task, a boring machine was used instead of the vertical lathe.

[0004] In a boring machine, the railway wheel is firmly clamped in a non-rotating clamping plate, and a rotating boring bar penetrates the hub hole of the railway wheel for machining. In this case, the static clamping of the wheel ensures higher machining precision.

[0005] For example, EP4292737A2 shows a railway wheel boring machine for machining the hub holes of railway wheels. The boring machine includes a base, a column fixed to the base and protruding vertically upward from the base, a working head attached to the column and vertically slidable on the column, a rotating boring bar arranged in the working head for machining the hub holes of railway wheels, and a non-rotating clamping plate for arranging the railway wheel. The clamping plate has a clamping unit for fixing and centering the wheel, and the clamping unit has three jaws, three spindles, and three hydraulic motors. Each motor drives a spindle attached to a jaw, and the three spindles are synchronized to synchronously move the three jaws. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a railway wheel boring machine for machining the hub holes of railway wheels.

[0007] The present utility model relates to a railway wheel boring machine for machining the hub holes of railway wheels, which comprises a base, a column fixed to the base and protruding vertically upward from the base, a workhead attached to the column and vertically slidable on the column, a rotary boring bar disposed in the workhead for machining the holes of the hub of the railway wheel, and a non-rotating clamping plate for disposing the railway wheel. The non-rotating clamping plate has a clamping unit for fixing and centring the railway wheel on the non-rotating clamping plate such that when the railway wheel is fixed on the non-rotating clamping plate, the centre of the railway wheel is aligned with the longitudinal axis of the rotary boring bar. The clamping unit includes at least three jaws for clamping the railway wheel, and the at least three jaws move along a straight path converging at the centre of the non-rotating clamping plate, wherein each jaw is attached to a transmission rod having a first end attached to the jaw and a second end attached to a swivel ring, and the swivel ring is driven by an actuator such that the actuator rotates the swivel ring to drive the transmission rod and move the jaws, thereby fixing the railway wheel.

[0008] The actuator indirectly moves the jaws via the transmission rods such that the transmission rods allow the actuator to be optimally arranged below the clamping plate with minimum space requirements, while the swivel ring synchronizes the movement of the three jaws by guiding the movement of the transmission rods. This enables the boring machine to have a clamping plate that is compact in both width and height, which allows railway wheels of different diameters to be fixed and centred in a safe manner for machining the wheel hub holes. For example, on a boring machine with a spindle as shown in EP4292737 A2, the wheel can be firmly centred and fixed on the clamping plate, but the drive requirements of the jaws require an over-sized clamping plate to accommodate the hydraulic motor and the spindle.

[0009] These and other advantages and features of the present utility model will become apparent in view of the accompanying drawings and the detailed description of the present utility model. Description of the Drawings

[0010] Figure 1 A perspective view showing an embodiment of a railway wheel boring machine according to the present utility model is shown.

[0011] Figure 2 A top perspective view of the non-rotating clamping plate of the boring machine is shown.

[0012] Figure 3 A view showing the inside of the clamping plate, which shows the jaws, the transmission rods, the actuator and the swivel ring, is shown.

[0013] Figure 4 A cross-sectional view of the clamping plate is shown.

[0014] Figure 5 The bottom view of the clamping plate is shown.

[0015] Figure 6 The actuator in the maximum retracted position is shown, and Figure 7 the actuator in the maximum extended position is shown.

[0016] Figure 8 The partial sectional perspective view of the railway wheel is shown. Detailed implementation mode

[0017] Figure 8 The structure of the railway wheel 10 is shown. The railway wheel 10 includes a rim 11, a tread 12, a wheel rim 13, a web 14, and a hub 15 having a hole 16. The axle is installed in the hole 16. The railway wheel 10 has a center C corresponding to the center of the hole 16. Figure 1 An embodiment of a railway wheel boring machine 100 according to the present invention is shown. The railway wheel boring machine 100 is used to fix and center the railway wheel 10 relative to its center C and machine the hole 16 of the hub 15 of the railway wheel 10. For clarity, the wheels 10 and the housing of the boring machine 100 are not shown in Figure 1 the figure.

[0018] The railway wheel boring machine 100 includes a base 101, a column 102 fixed to the base 101 and protruding vertically upward from the base 101, a working head 103 attached to the column 102 and vertically slidable on the column 102, a rotary boring bar 104 disposed in the working head 103 for machining the hole 16 of the hub 15 of the railway wheel 10, and a non-rotating clamping plate 105 for disposing the railway wheel 10.

[0019] The non-rotating clamping plate 105 has a clamping unit 106 for fixing and centering the railway wheel 10 on the clamping plate 105 such that when the railway wheel 10 is fixed on the clamping plate 105, the center C of the railway wheel 10 is aligned with the longitudinal axis Z of the rotary boring bar 104. As seen in Figure 1 the figure, the boring bar 104 has a longitudinal axis Z extending perpendicular to the horizontal plane of the floor on which the boring machine 100 is disposed.

[0020] The working head 103 is driven by a first motor, and the first motor moves the working head 103 vertically on the column 102. The rotary boring bar 104 is driven by a second motor, and the second motor rotates the boring bar 104. The boring bar 104 rotates about its own longitudinal axis Z, and the working head 103 moves vertically along an axis perpendicular to the horizontal plane of the floor on which the boring machine 100 is disposed.

[0021] The column 102 may have a guide rail 109 that extends vertically on the column 102, and the working head 103 may have a sliding seat 110 that is slidably connected to the guide rail 109 of the column 102. The sliding seat 110 may be attached to a nut-spindle mechanism that is driven by a first motor to move the working head 103 on the column 102.

[0022] The rotary boring bar 104 has at least one cutting tool 111 that projects radially outward from the boring bar 104 to machine the hole 16 of the railway wheel 10. The cutting tool 111 can move transversely along an axis perpendicular to the longitudinal axis Z of the boring bar 104 to change the distance by which the cutting tool 111 projects from the boring bar 104, such that by changing such distance, the diameter of the hole 16 of the railway wheel 10 to be machined can be changed.

[0023] In this way, when the railway wheel 10 is fixed to the clamping plate 105, the working head 103 having the boring bar 104 moves vertically towards the clamping plate 105, and the boring bar 104 rotates about its longitudinal axis Z to machine the hole 16 of the hub 15 of the railway wheel 10.

[0024] As Figure 1 shown, preferably, the clamping plate 105 has a seat 112 for supporting the railway wheel 10 and a belt 113 that can move vertically between an upper position and a lower position. In the upper position, the belt 113 is located above the seat 112 to receive the railway wheel 10, and in the lower position, the belt 113 is located below the seat 112 to allow the railway wheel 10 to rest on the seat 112 (in Figure 1 the figure, the belt 113 is shown in the lower position). The railway wheel 10 rests on the seat 112 on the inner side of the rim 13, which is the side opposite to the side where the flange 11 is located.

[0025] More preferably, the clamping plate 105 has a loading unit 114 for conveying the railway wheel 10 towards the belt 113 and a discharging unit 115 for receiving the railway wheel 10 from the belt 113. For example, the loading unit 114 and the discharging unit 115 may include motor-driven rotating rollers. The belt 113 of the clamping plate 105 is driven by a motor to receive the wheel 10 from the loading unit 114 and convey the wheel 10 towards the discharging unit 115 after the wheel 10 is processed. In the upper position, the belt 113 is arranged at the height of the loading unit 114 and the discharging unit 115, such that when the wheel 10 is to be processed, the loading unit 114 conveys the wheel 10 towards the belt 113 in the upper position, then the belt 113 moves the wheel 10 to position the wheel 10 above the seat 112, then the belt 113 moves to the lower position until the wheel 10 rests on the seat 112, then the clamping unit 106 fixes and centers the wheel 10 to be machined by the boring bar 104, and after machining, the belt 113 moves to the upper position such that the wheel 10 no longer rests on the seat 112, and the belt 113 conveys the wheel 10 towards the discharging unit 115. In this way, the belt 113 initially centers the wheel 10 on the clamping plate 105, and subsequently the clamping unit 106 finally centers the wheel 10 such that the center C of the wheel 10 is aligned with the longitudinal axis Z of the boring bar 104.

[0026] Preferably, the clamping plate 105 has a first detection device 116 and a second detection device 117. The first detection device 116 is arranged at one end of the belt 113 to detect the entry of the railway wheel 10 from the loading unit 114, and the second detection device 117 is arranged at the other end of the belt 113 to detect the departure of the railway wheel 10 towards the discharging unit 115. The first detection device 116 is arranged at the end of the belt 113 adjacent to the loading unit 114, and the second detection device 117 is arranged at the end of the belt 113 adjacent to the discharging unit 115. Each of the detection devices 116 and 117 may include a laser emitter and a laser receiver.

[0027] As Figure 2 As shown in detail, the clamping unit 106 has three jaws 118 for clamping the railway wheel 10, and the three jaws 108 move along a straight path T converging at the center C' of the clamping plate 105. When the railway wheel 10 is fixed and centered on the clamping plate 105, the center C' of the clamping plate 105 coincides with the center C of the hole 16 of the hub 15 of the railway wheel 10.

[0028] As in Figures 3 to 5As can be seen in detail, each jaw 118 is attached to a transmission rod 119, which has a first end 120 attached to the jaw 118 and a second end 121 attached to a swivel ring 122, and the swivel ring 122 is driven by an actuator 123 such that the actuator 123 rotates the swivel ring 122 to drive the transmission rod 119 and move the jaw 118, thereby fixing the railway wheel 10.

[0029] In this way, the linear displacement of the actuator 123 is converted into the rotational movement of the swivel ring 122, and the rotational movement of the swivel ring 122 is converted via the transmission rod 119 into the linear displacement of the jaw 118, which enables an optimal clamping force to be generated on the railway wheel 10 and at the same time a compact clamping plate 105 to be obtained, which optimizes the space occupied and can fix wheels 10 of different diameters without the need for the clamping plate 105 to be too large. For example, the clamping unit allows each jaw 118 to exert a force of 2500 kg on the wheel 10 and can fix wheels 10 with diameters between 711 mm and 1200 mm.

[0030] Preferably, as can be seen in the example figure, the clamping unit 106 has three actuators 123 for driving the swivel ring 122. However, alternatively, only two actuators 123 can be used to drive the swivel ring 122. However, preferably, one actuator 123 is used for each of the three jaws 118 to avoid having to make the force exerted by the actuator 123 too large. More preferably, the actuators 123 act on three angular positions of the swivel ring 122 that are 120° out of phase with each other, such that a balanced force system is obtained.

[0031] Even more preferably, each actuator 123 is attached to the second end 121 of the corresponding transmission rod 119. In this way, the actuator 123 acts directly on the transmission rod 119 that displaces the jaw 118, thereby optimizing the force exerted by each of the actuators 123 to pull the corresponding transmission rod 119. Specifically, each actuator 123 has a fixed end 124 and a free end 125 that is displaceable relative to the fixed end 124. The free end 125 is attached to the second end 121 of the corresponding transmission rod 119, and the fixed end 124 is attached to the non-rotating clamping plate 105.

[0032] As can be seen in the figure, the jaws 118 are arranged in the upper part of the clamping plate 105, and the actuators 123, transmission rods 119 and swivel ring 122 are arranged in the lower part of the clamping plate 105 without protruding radially outward from the clamping plate 105, that is, the actuators 123, transmission rods 119 and swivel ring 122 do not protrude from the vertical projection of the clamping plate 105, thereby making the width and height of the clamping plate 105 compact.

[0033] As in Figure 4As seen in the partial cross-sectional view, each jaw 118 has a sliding seat 127 that travels on a pair of guide rails 128 of the clamping plate 105. The guide rails 128 converge towards the center C’ of the clamping plate 105, and each sliding seat 127 is attached to a corresponding transmission rod 119. The guide rails 128 for the movement of the sliding seats 127 of the jaws 118 are arranged in the upper part of the clamping plate 105, and the transmission rods 119 and the actuators 123 acting on the rotary ring 122 are arranged at the lower part of the clamping plate 105.

[0034] The clamping plate 105 has an outer periphery located at a position opposite to the center C’ of the clamping plate 105, and the fixed end 124 of each actuator 123 is fixed at a point on the outer periphery of the clamping plate 105, and the jaws 118 are displaced from the outer periphery towards the center C’ of the clamping plate 105 such that the actuators 123 are located in a position substantially parallel to the displacement of the jaws 118. According to the embodiment shown in the figure, the clamping plate 105 has a preferred circular shape, and the outer periphery of the clamping plate 105 corresponds to the outer diameter of the circular shape. Figure 6 The actuator 123 is shown in the maximum retracted position, where the jaws 118 are located on the outer periphery of the clamping plate 105, and Figure 7 The actuator 123 is shown in the maximum extended position, where the jaws 118 are located at the center C’ of the clamping plate 105.

[0035] Each transmission rod 119 is hingedly connected to a corresponding actuator 123 via an intermediate member 129, where each intermediate member 129 hingedly connects the free end 125 of the actuator 123 to the second end 121 of the transmission rod 119. The size of the intermediate member 129, the lengths of the transmission rod 119 and the actuator 123, and the diameter of the rotary ring 122 are selected according to the diameter of the wheel 10 to be attached to the clamping plate 105.

[0036] Preferably, each jaw 118 has a contact surface 130 for fixing the railway wheel 10 by means of the wheel tread 12. Applying a high clamping force is required to firmly fix the wheel 10, so it is preferred to apply the force on the tread 12 rather than on other less rigid areas of the wheel 10 (such as the rim 11).

[0037] The rotary ring 122 has an inner ring 132 fixed to the non-rotating clamping plate 105 and a movable outer ring 133 fixed to the transmission rod 119. A bearing is located between the inner ring 132 and the outer ring 133.

[0038] Preferably, the actuator 123 is a hydraulic cylinder.

[0039] Even more preferably, the actuator 123 can be connected to a hydraulic fluid supply unit (not shown), which can have a diverter to equally divide the hydraulic fluid supplied to each actuator to facilitate the synchronous movement of the actuator 123.

[0040] The clamping plate 105 has a central hole 131 for chip removal. When the railway wheel 10 is fixed to the non-rotating clamping plate 105, the central hole 131 is connected to the hole 16 of the hub 15 of the railway wheel 10. Preferably, the diameter of the central hole 131 is larger than the diameter of the hole 16 of the hub 15 of the railway wheel 10 to be machined, so as to discharge chips through the central hole 131. Additionally, the rotary boring bar 104 can have a cover 134 that can move vertically relative to the working head 103 to contact the railway wheel 10 and isolate the hole 16 of the hub 15 of the railway wheel 10 when the wheel 10 is being machined, so as to facilitate chip removal through the central hole 131 of the clamping plate 105.

[0041] The present utility model provides exemplary embodiments defined by the following clauses.

[0042] Clause 1. A railway wheel boring machine for machining a hole in a hub of a railway wheel, the railway wheel boring machine comprising a base 101, a column 102 fixed to the base 101 and protruding vertically upward from the base 101, a working head 103 attached to the column 102 and capable of sliding vertically on the column 102, a rotary boring bar 104 disposed in the working head 103 for machining a hole 16 in a hub 15 of a railway wheel 10, and a non-rotating clamping plate 105 for disposing the railway wheel 10, the non-rotating clamping plate 105 having a clamping unit 106 for fixing and centering the railway wheel 10 on the non-rotating clamping plate 105 such that when the railway wheel 10 is fixed to the non-rotating clamping plate 105, the center C of the railway wheel 10 is aligned with the longitudinal axis Z of the rotary boring bar 104, the clamping unit 106 including at least three jaws 118 for clamping the railway wheel 10, the at least three jaws 118 moving along a straight path T converging at a center C' of the non-rotating clamping plate 105,

[0043] wherein each jaw 118 is attached to a transmission rod 119 having a first end 120 attached to the jaw 118 and a second end 121 attached to a swivel ring 122, and the swivel ring 122 is driven by an actuator 123 such that the actuator 123 rotates the swivel ring 122 to drive the transmission rod 119 and move the jaws 118 to fix the railway wheel 10.

[0044] Clause 2. The railway wheel boring machine for machining the hub hole of a railway wheel according to Clause 1, characterized in that the clamping unit 106 has three actuators 123 for driving the rotary ring 122.

[0045] Clause 3. The railway wheel boring machine for machining the hub hole of a railway wheel according to Clause 2, characterized in that the three actuators 123 act on three angular positions of the rotary ring 122, and the three angular positions are out of phase with each other by 120°.

[0046] Clause 4. The railway wheel boring machine for machining the hub hole of a railway wheel according to Clause 2, characterized in that each actuator 123 is attached to the second end 121 of the corresponding transmission rod 119.

[0047] Clause 5. The railway wheel boring machine for machining the hub hole of a railway wheel according to Clause 4, characterized in that each actuator 123 has a fixed end 124 and a free end 125 displaceable relative to the fixed end 124, the free end 125 is attached to the second end 121 of the corresponding transmission rod 119, and the fixed end 124 is attached to the non-rotating clamping plate 105.

[0048] Clause 6. The railway wheel boring machine for machining the hub hole of a railway wheel according to Clause 5, characterized in that the fixed end 124 of each actuator 123 is fixed at a point on the outer periphery of the non-rotating clamping plate 105, and the straight path T for moving the jaw 118 is provided between the outer periphery of the non-rotating clamping plate 105 and the center C' of the non-rotating clamping plate 105.

[0049] Clause 7. The railway wheel boring machine for machining the hub hole of a railway wheel according to Clause 5 or 6, characterized in that each transmission rod 119 is hingedly connected to the corresponding actuator 123 via an intermediate member 129, and each intermediate member 129 hingedly connects the free end 125 of the actuator 123 to the second end 121 of the transmission rod 119.

[0050] Clause 8. The railway wheel boring machine for machining the hub hole of a railway wheel according to any one of Clauses 1 to 6, characterized in that each jaw 118 has a contact surface 130 for fixing the railway wheel 10 by means of the tread 12 of the railway wheel.

[0051] 9. The railway wheel boring machine for machining the hub hole of a railway wheel according to any one of clauses 1 to 6, characterized in that the non-rotating clamping plate 105 has a central hole 131 for chip removal, and when the railway wheel 10 is fixed on the non-rotating clamping plate 105, the central hole 131 is connected to the hole 16 of the hub 15 of the railway wheel 10.

[0052] Clause 10. The railway wheel boring machine for machining the hub hole of a railway wheel according to clause 9, characterized in that the diameter of the central hole 131 is larger than the diameter of the hole 16 of the hub 15 of the railway wheel 10 to be machined.

[0053] Clause 11. The railway wheel boring machine for machining the hub hole of a railway wheel according to clause 9, characterized in that the rotating boring bar 104 has a cover 134 which can move vertically relative to the working head 103 to contact the railway wheel 10 and isolate the hole 16 of the hub 15 from the railway wheel 10 when the railway wheel 10 is being machined.

[0054] Clause 12. The railway wheel boring machine for machining the hub hole of a railway wheel according to any one of clauses 1 to 6, characterized in that the slewing ring 122 has an inner ring 132 fixed to the non-rotating clamping plate 105 and a movable outer ring 133 fixed to the drive rod 119.

[0055] Clause 13. The railway wheel boring machine for machining the hub hole of a railway wheel according to any one of clauses 1 to 6, characterized in that the actuator 123 is connected to a hydraulic fluid supply unit which has a diverter to equally divide the hydraulic fluid supplied to each actuator 123.

[0056] Clause 14. The railway wheel boring machine for machining the hub hole of a railway wheel according to any one of clauses 1 to 6, characterized in that the non-rotating clamping plate 105 has a seat 112 for supporting the railway wheel 10 and a belt 113 which can move vertically between an upper position and a lower position. In the upper position, the belt 113 is above the seat 112 to receive the railway wheel 10, and in the lower position, the belt 113 is below the seat 112 to allow the railway wheel 10 to rest on the seat 112.

[0057] Clause 15. The railway wheel boring machine for machining the hub hole of a railway wheel according to Clause 14, characterized in that the non-rotating clamping plate 105 is provided with a first detection device 116 and a second detection device 117, the first detection device 116 is arranged at one end of the belt 113 to detect the entry of the railway wheel 10 from the loading unit 114, and the second detection device 117 is arranged at the other end of the belt 113 to detect the departure of the railway wheel 10 towards the discharging unit 115.

Claims

1. A railway wheel boring machine for machining a railway wheel hub hole, the railway wheel boring machine comprising a base (101), a column (102) fixed to the base (101) and protruding vertically upward from the base (101), a working head (103) attached to the column (102) and capable of vertically sliding on the column (102), a rotating boring bar (104) arranged in the working head (103) for machining a hole (16) of a hub (15) of a railway wheel (10), and a non-rotating clamping plate (105) for arranging the railway wheel (10), the non-rotating clamping plate (105) having a clamping a unit (106) for fixing and centering the railway wheel (10) on the non-rotating clamping plate (105) so that when the railway wheel (10) is fixed on the non-rotating clamping plate (105), the center (C) of the railway wheel (10) is aligned with the longitudinal axis (Z) of the rotating boring bar (104), the clamping unit (106) comprising at least three jaws (118) for clamping the railway wheel (10), the at least three jaws (118) moving along a straight path (T) converging at the center (C') of the non-rotating clamping plate (105), It is characterized in that Each claw (118) is attached to a drive rod (119) having a first end (120) attached to the claw (118) and a second end (121) attached to a slewing ring (122), and the slewing ring (122) is driven by an actuator (123) so that the actuator (123) rotates the slewing ring (122) to drive the drive rod (119) and move the claw (118), thereby fixing the railway wheel (10).

2. The railway wheel boring machine for machining railway wheel hub holes according to claim 1, characterized in that: The clamping unit (106) has three actuators (123) for driving the slewing ring (122).

3. The railway wheel boring machine for machining railway wheel hub holes according to claim 2, characterized in that: The three actuators (123) act on three angular positions of the slewing ring (122), and the three angular positions are 120° out of phase with each other.

4. The railway wheel boring machine for machining railway wheel hub holes according to claim 2, characterized in that: Each actuator (123) is attached to the second end (121) of the corresponding transmission rod (119).

5. The railway wheel boring machine for machining railway wheel hub holes according to claim 4, characterized in that: Each actuator (123) has a fixed end (124) and a free end (125) that is displaceable relative to the fixed end (124), the free end (125) being attached to the second end (121) of the corresponding transmission rod (119), and the fixed end (124) being attached to the non-rotating clamping plate (105).

6. The railway wheel boring machine for machining railway wheel hub holes according to claim 5, characterized in that: The fixed end (124) of each actuator (123) is fixed at a point located on the periphery of the non-rotating clamping plate (105), and the straight path (T) for moving the claw (118) is arranged between the periphery of the non-rotating clamping plate (105) and the center (C') of the non-rotating clamping plate (105).

7. The railway wheel boring machine for machining railway wheel hub holes according to claim 5 or 6, characterized in that: Each transmission rod (119) is hingedly connected to the corresponding actuator (123) via an intermediate member (129), and each intermediate member (129) hingedly connects the free end (125) of the actuator (123) to the second end (121) of the transmission rod (119).

8. The railway wheel boring machine for machining a railway wheel hub hole according to any one of claims 1 to 6, characterized in that: Each jaw (118) has a contact surface (130) for securing the railway wheel (10) with the tread (12) of the railway wheel.

9. The railway wheel boring machine for machining a railway wheel hub hole according to any one of claims 1 to 6, characterized in that: The non-rotating clamping plate (105) has a central hole (131) for chip removal, which is connected to the hole (16) of the hub (15) of the railway wheel (10) when the railway wheel (10) is fixed on the non-rotating clamping plate (105).

10. The railway wheel boring machine for machining railway wheel hub holes according to claim 9, characterized in that: The diameter of the central hole (131) is greater than the diameter of the hole (16) of the hub (15) of the railway wheel (10) to be processed.

11. The railway wheel boring machine for machining a railway wheel hub hole according to claim 9, characterized in that: The rotary boring bar (104) has a cover (134) that is vertically movable relative to the work head (103) to contact the railway wheel (10) and isolate the bore (16) of the hub (15) from the railway wheel (10) while the bore (16) of the hub (15) is being machined.

12. The railway wheel boring machine for machining a railway wheel hub hole according to any one of claims 1 to 6, characterized in that: The slewing ring (122) has an inner ring (132) fixed to the non-rotating clamping plate (105) and a movable outer ring (133) fixed to the transmission rod (119).

13. The railway wheel boring machine for machining a railway wheel hub hole according to any one of claims 1 to 6, characterized in that: The actuators (123) are connected to a hydraulic fluid supply unit having a flow divider to equally divide the hydraulic fluid supplied to each actuator (123).

14. The railway wheel boring machine for machining a railway wheel hub hole according to any one of claims 1 to 6, characterized in that: The non-rotating clamping plate (105) has a seat (112) for supporting the railway wheel (10) and a belt (113) that is vertically movable between an upper position in which the belt (113) is above the seat (112) to receive the railway wheel (10) and a lower position in which the belt (113) is below the seat (112) to allow the railway wheel (10) to rest on the seat (112).

15. The railway wheel boring machine for machining a railway wheel hub hole according to claim 14, characterized in that: The non-rotating clamping plate (105) has a first detection device (116) arranged at one end of the belt (113) to detect the entry of the railway wheel (10) from the loading unit (114) and a second detection device (117) arranged at the other end of the belt (113) to detect the exit of the railway wheel (10) towards the discharge unit (115).

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