WO2005012867A1 - Method and equipment for the dynamic balancing of the rims of wheels of motor vehicles - Google Patents

Method and equipment for the dynamic balancing of the rims of wheels of motor vehicles Download PDF

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Publication number
WO2005012867A1
WO2005012867A1 PCT/EP2004/051492 EP2004051492W WO2005012867A1 WO 2005012867 A1 WO2005012867 A1 WO 2005012867A1 EP 2004051492 W EP2004051492 W EP 2004051492W WO 2005012867 A1 WO2005012867 A1 WO 2005012867A1
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WO
WIPO (PCT)
Prior art keywords
rim
mandrel
machine tool
balancing
sensors
Prior art date
Application number
PCT/EP2004/051492
Other languages
French (fr)
Inventor
Marcus Caldana
Original Assignee
Minganti International Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minganti International Limited filed Critical Minganti International Limited
Priority to EP04766222A priority Critical patent/EP1656540A1/en
Publication of WO2005012867A1 publication Critical patent/WO2005012867A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/14—Determining imbalance
    • G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
    • G01M1/22—Determining imbalance by oscillating or rotating the body to be tested and converting vibrations due to imbalance into electric variables
    • G01M1/225—Determining imbalance by oscillating or rotating the body to be tested and converting vibrations due to imbalance into electric variables for vehicle wheels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/02—Details of balancing machines or devices
    • G01M1/04—Adaptation of bearing support assemblies for receiving the body to be tested
    • G01M1/045—Adaptation of bearing support assemblies for receiving the body to be tested the body being a vehicle wheel
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/30—Compensating imbalance
    • G01M1/34—Compensating imbalance by removing material from the body to be tested, e.g. from the tread of tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2215/00—Details of workpieces
    • B23B2215/08—Automobile wheels

Definitions

  • TITLE "Method and equipment for the dynamic balancing of the rims of wheels of motor vehicles"
  • the invention relates to a process and equipment for the dynamic balancing, during the production cycle, of the rims, particularly light alloy rims for the wheels of motor vehicles, or for the dynamic balancing of other parts having similar requirements.
  • rims are subjected to final machining on numerically controlled machine tools, which turn them and finish their surfaces and which make holes for the passage of bolts for subsequent fixing to the motor vehicle and the perimetric hole for the passage of the future wheel inflation valve.
  • the rim On the machine tools, the rim is mounted in two different positions, so that it has first one of its faces and then the other facing upwards, for example.
  • the rim is placed on a balancing machine, which has the function of indicating and determining quantitatively in which area or areas of the round angle, which are marked visibly, material has to be removed from the rim to dynamically balance it.
  • the rim is mounted on another machine tool which removes the material from the said areas identified by the balancing machine, and this operation is usually carried out with milling or piercing operations, frequently in areas of the rim which are not visible, for example on the inner side, or possibly by localized turning operations, for which the rim is normally made to rotate in an eccentric position.
  • the balancing machining of the rims must be very precise. At the present time, for example, tolerances of approximately 14 g/mm are permitted on the vibration vector, as against the former tolerances of approximately 70 g/mm, in order to provide greater safety for users, even at the higher speeds which rubber-tyred wheels of motor vehicles can reach at present.
  • the invention is intended to overcome all these drawbacks of the known art with the following proposed solution.
  • the whole process of checking and executing the balancing of the rim is carried out by the numerically controlled machine tool which also carried out the final step of final machining of the said rim, with the evident major financial advantages derived from this condition.
  • the said finishing machine tool is provided with sensors for detecting the vibrations produced on the mandrel by the imbalance of the rim.
  • the mandrel which carries the rim is driven in the usual way by a motor with electronic speed and phase control.
  • the rim is positioned with the valve hole in a predetermined angular position which is known to the logic circuit, which, by means of the said sensors, determines the angular position and the extent of the dynamic imbalance, and the final balancing machining is carried out by eccentric and/or localized turning, with the rim continuing to rotate normally about its axis, at the correct velocity, while the turning tool is moved by the numerical control system in such a way as to remove the quantified amount of material only in the area or areas identified by means of the said sensors.
  • FIG. 1 is a lateral elevation of a rim of the type in question, and shows a possible eccentric turning operation carried out to achieve the dynamic balancing of the said rim;
  • Figure 3 shows a flow chart of the balancing function of the machine.
  • the letter M indicates the mandrel of the numerically controlled finishing machine tool, whose shaft 1 is supported rotatably by bearings 2 and is driven by a motor 3 with electronic speed and phase control, for example a brushless motor, with brake.
  • the number 4 indicates the platform of the mandrel, having an axial pin 5 which interacts, for the purposes of centring, with the axial hole of the rim C, the said platform being provided with perimetric self-centring brackets 6 which secure the said rim C.
  • the number 7 indicates the electronic numerical control unit which interfaces with a programming and interrogation system 8, with the mandrel drive motor 3 and with the system of machining tools 9 which are mounted, for example, on a revolver unit positioned on means 10 for movement along at least two orthogonal axes, motorized to carry out not only turning operations but also other operations such as drilling.
  • the finishing machine tool is provided with one or more sensors 11 , of the accelerometer type for example, for detecting the radial vibrations and possibly also axial vibrations of the shaft 1 of the mandrel M, for example the vibrations generated by this shaft in the outer ring of at least one of its support bearings 2.
  • sensors 11 of the accelerometer type for example, for detecting the radial vibrations and possibly also axial vibrations of the shaft 1 of the mandrel M, for example the vibrations generated by this shaft in the outer ring of at least one of its support bearings 2.
  • the location of the sensors shown in Figure 1 is shown purely by way of example and is not restrictive. If a plurality of sensors is used, they can for example be spaced apart angularly at intervals of ninety degrees.
  • the electrical signals produced by the sensors 11 are sent to an amplification, calculation and processing unit 12 which interfaces with the numerical control unit 7 and with the aforementioned operating logic, and which can be programmed and 10360/E
  • the final machining of the rim is normally carried out in two successive steps, for example in a first step in which the inner face of the said rim is machined, and a second step in which the outer face is machined, with the formation of the fixing holes FF and the valve hole FV of the rim.
  • the outer lateral surface of the rim, on which the tyre is to be placed is also finished.
  • the machine which has carried this out automatically proceeds to the step of balancing the finished rim, as indicated henceforth with reference to the flow chart in Figure 3, the said rim being kept with its outer face orientated upwards.
  • the scope of the invention also includes the variant in which, on completion of the final machining of the rim, the said rim is repositioned on the mandrel M with its inner face directed upwards, in such a way that the aforesaid eccentric turning operations are carried out on the inner face of the rim, with the advantage of being executable with a limited degree of finishing, since they are not visible from the outside.
  • automatic manipulation means (not shown) are provided, these means positioning the rim on the mandrel M of the machine tool with the area intended for the valve hole FV in a constant and predetermined position which is known to the unit 7 and/or 12.
  • the said units can also be provided with information, for example by means of the programming unit 8, about the dimensional characteristics and the eccentric position of the hole FV, so that the system can discriminate the size and the position in the round angle of the vibrations caused by the said hole FV.
  • step 13 shows the start of the balancing.
  • step 14 shows the checking and quantification, by the unit 12 of Figure 1 , of the vibrations produced by the mandrel M carrying the rim C to be balanced, with allowance for the vibrations caused by the valve hole FV, which will later be substantially compensated by the inflation valve which will 10360/E
  • Step 15 shows the determination of the actual values and coordinates of the dynamic imbalance of the rim, by means of the unit 12 which executes an operation of subtracting the vibrations produced with the mandrel unloaded from the vibrations deduced in step 14 (see below).
  • Step 16 shows the execution of the eccentric and/or localized turning operation by the machine tool, for carrying out the dynamic balancing of the rim to the predetermined tolerances.
  • the rim is made to rotate about its axis at a predetermined velocity, in the region of 400-700 rpm, for example approximately 500 rpm, while the unit 12 orders the numeric controller 7 to control the predetermined tools 9 in such a way that they carry out a turning operation on a predetermined area 17, which is usually eccentric, on any suitable part of the surface of the rim, for example on the strongest lateral part on which the tyre will be fitted (Figs 1 and 2).
  • the turning 17 can be carried out with a good level of finishing and can be integrated harmoniously into the external appearance of the rim, in such a way that it would not be significantly visible to the naked eye, even if, by contrast with the previous suggestion, it were carried out on the visible face of the rim.
  • the areas on which the eccentric turning operation or operations are carried out are to be selected in advance in a suitable step in which the system is programmed.
  • Step 16 is followed by step 18 which checks whether or not the balancing has been carried out correctly. If the result is negative, the values of the residual imbalance are identified and quantified, and, as indicated by the path 19 in Figure 3, a return is made to step 16 for another eccentric turning operation. However, if the rim is found to be correctly balanced, step 18 is followed by step 20 which constitutes the end of the balancing and the removal of the finished and balanced rim from the mandrel M of the machine.
  • Step 20 is followed by step 21 in which the unloaded imbalance of the mandrel M is checked and quantified, this value being used as indicated by the path 22 in the 10360/E

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Balance (AREA)

Abstract

The whole process of checking and executing the balancing of the rim is carried out by,the numerically controlled machine tool which'also carries out the final machining of the rim, with the evident major financial advantages derived from this condition. The machine is provided with sensors (11) for detecting the vibrations produced on the mandrel (M) by the dynamic imbalance of the rim (C). The mandrel carrying the rim is driven by a motor with electronic speed and phase control. The rim is positioned with the valve hole (FV) in a predetermined angular position which is known to the logic circuit (12) which by means of the said sensors (11) determines the angular position and extent of the dynamic imbalance, and the final balancing machining is carried out by eccentric and/or localized turning, with the rim continuing to rotate normally about its axis, at the correct velocity, while the turning tool (9) is moved by the numerical control system (7) in such a way as to remove the predetermined amount of material only in the area or areas identified by means of the said sensors.

Description

10360/E
TITLE: "Method and equipment for the dynamic balancing of the rims of wheels of motor vehicles"
DESCRIPTION The invention relates to a process and equipment for the dynamic balancing, during the production cycle, of the rims, particularly light alloy rims for the wheels of motor vehicles, or for the dynamic balancing of other parts having similar requirements.
At the present time, rims are subjected to final machining on numerically controlled machine tools, which turn them and finish their surfaces and which make holes for the passage of bolts for subsequent fixing to the motor vehicle and the perimetric hole for the passage of the future wheel inflation valve. On the machine tools, the rim is mounted in two different positions, so that it has first one of its faces and then the other facing upwards, for example. After the said step of final machining, the rim is placed on a balancing machine, which has the function of indicating and determining quantitatively in which area or areas of the round angle, which are marked visibly, material has to be removed from the rim to dynamically balance it. In a subsequent step of machining, the rim is mounted on another machine tool which removes the material from the said areas identified by the balancing machine, and this operation is usually carried out with milling or piercing operations, frequently in areas of the rim which are not visible, for example on the inner side, or possibly by localized turning operations, for which the rim is normally made to rotate in an eccentric position.
The balancing machining of the rims must be very precise. At the present time, for example, tolerances of approximately 14 g/mm are permitted on the vibration vector, as against the former tolerances of approximately 70 g/mm, in order to provide greater safety for users, even at the higher speeds which rubber-tyred wheels of motor vehicles can reach at present.
After machining, the rims are rechecked individually or by sampling, using the 10360/E
balancer, and if necessary they are remachined with the machine tool. Clearly, the present method of dynamic balancing of motor vehicle wheel rims is lengthy, wasteful and expensive, and it requires the use of a plurality of machines, with consequent problems due to the need for large working areas and major financial investment, especially when automatic systems have to be devised for transferring the rim between the various machines. The different ways of positioning the rim on the different machines can inevitably limit the precision of the machining to be carried out.
The invention is intended to overcome all these drawbacks of the known art with the following proposed solution. The whole process of checking and executing the balancing of the rim is carried out by the numerically controlled machine tool which also carried out the final step of final machining of the said rim, with the evident major financial advantages derived from this condition. The said finishing machine tool is provided with sensors for detecting the vibrations produced on the mandrel by the imbalance of the rim. The mandrel which carries the rim is driven in the usual way by a motor with electronic speed and phase control. The rim is positioned with the valve hole in a predetermined angular position which is known to the logic circuit, which, by means of the said sensors, determines the angular position and the extent of the dynamic imbalance, and the final balancing machining is carried out by eccentric and/or localized turning, with the rim continuing to rotate normally about its axis, at the correct velocity, while the turning tool is moved by the numerical control system in such a way as to remove the quantified amount of material only in the area or areas identified by means of the said sensors.
Further characteristics of the invention and the advantages derived therefrom will be revealed more fully in the following description of a preferred embodiment of the invention, illustrated purely by way of example, without restrictive intent, in the figures of the three attached sheets of drawings, in which: - Figure 1 shows, with parts in section, the rim mounted on the mandrel of the 10360/E
finishing machine tool and shows a block diagram of the parts which enable this machine to operate additionally as a dynamic balancer; Figure 2 is a lateral elevation of a rim of the type in question, and shows a possible eccentric turning operation carried out to achieve the dynamic balancing of the said rim; Figure 3 shows a flow chart of the balancing function of the machine.
In Figure 1 , the letter M indicates the mandrel of the numerically controlled finishing machine tool, whose shaft 1 is supported rotatably by bearings 2 and is driven by a motor 3 with electronic speed and phase control, for example a brushless motor, with brake. The number 4 indicates the platform of the mandrel, having an axial pin 5 which interacts, for the purposes of centring, with the axial hole of the rim C, the said platform being provided with perimetric self-centring brackets 6 which secure the said rim C. The number 7 indicates the electronic numerical control unit which interfaces with a programming and interrogation system 8, with the mandrel drive motor 3 and with the system of machining tools 9 which are mounted, for example, on a revolver unit positioned on means 10 for movement along at least two orthogonal axes, motorized to carry out not only turning operations but also other operations such as drilling.
According to the invention, the finishing machine tool is provided with one or more sensors 11 , of the accelerometer type for example, for detecting the radial vibrations and possibly also axial vibrations of the shaft 1 of the mandrel M, for example the vibrations generated by this shaft in the outer ring of at least one of its support bearings 2. Clearly, the location of the sensors shown in Figure 1 is shown purely by way of example and is not restrictive. If a plurality of sensors is used, they can for example be spaced apart angularly at intervals of ninety degrees.
The electrical signals produced by the sensors 11 are sent to an amplification, calculation and processing unit 12 which interfaces with the numerical control unit 7 and with the aforementioned operating logic, and which can be programmed and 10360/E
interrogated, for example, by means of the unit 8 or another special-purpose unit.
The final machining of the rim is normally carried out in two successive steps, for example in a first step in which the inner face of the said rim is machined, and a second step in which the outer face is machined, with the formation of the fixing holes FF and the valve hole FV of the rim. During these steps of operation, the outer lateral surface of the rim, on which the tyre is to be placed, is also finished. After the final step of finishing, the machine which has carried this out automatically proceeds to the step of balancing the finished rim, as indicated henceforth with reference to the flow chart in Figure 3, the said rim being kept with its outer face orientated upwards. However, it is to be understood that the scope of the invention also includes the variant in which, on completion of the final machining of the rim, the said rim is repositioned on the mandrel M with its inner face directed upwards, in such a way that the aforesaid eccentric turning operations are carried out on the inner face of the rim, with the advantage of being executable with a limited degree of finishing, since they are not visible from the outside.
For the correct operation of the equipment, automatic manipulation means (not shown) are provided, these means positioning the rim on the mandrel M of the machine tool with the area intended for the valve hole FV in a constant and predetermined position which is known to the unit 7 and/or 12. The said units can also be provided with information, for example by means of the programming unit 8, about the dimensional characteristics and the eccentric position of the hole FV, so that the system can discriminate the size and the position in the round angle of the vibrations caused by the said hole FV.
In Figure 3, step 13 shows the start of the balancing. Step 14 shows the checking and quantification, by the unit 12 of Figure 1 , of the vibrations produced by the mandrel M carrying the rim C to be balanced, with allowance for the vibrations caused by the valve hole FV, which will later be substantially compensated by the inflation valve which will 10360/E
be fitted in the said hole FV when the rim is in use. Step 15 shows the determination of the actual values and coordinates of the dynamic imbalance of the rim, by means of the unit 12 which executes an operation of subtracting the vibrations produced with the mandrel unloaded from the vibrations deduced in step 14 (see below).
Step 16 shows the execution of the eccentric and/or localized turning operation by the machine tool, for carrying out the dynamic balancing of the rim to the predetermined tolerances. In this step, as shown in Figure 2, the rim is made to rotate about its axis at a predetermined velocity, in the region of 400-700 rpm, for example approximately 500 rpm, while the unit 12 orders the numeric controller 7 to control the predetermined tools 9 in such a way that they carry out a turning operation on a predetermined area 17, which is usually eccentric, on any suitable part of the surface of the rim, for example on the strongest lateral part on which the tyre will be fitted (Figs 1 and 2). The turning 17 can be carried out with a good level of finishing and can be integrated harmoniously into the external appearance of the rim, in such a way that it would not be significantly visible to the naked eye, even if, by contrast with the previous suggestion, it were carried out on the visible face of the rim. The areas on which the eccentric turning operation or operations are carried out are to be selected in advance in a suitable step in which the system is programmed.
Step 16 is followed by step 18 which checks whether or not the balancing has been carried out correctly. If the result is negative, the values of the residual imbalance are identified and quantified, and, as indicated by the path 19 in Figure 3, a return is made to step 16 for another eccentric turning operation. However, if the rim is found to be correctly balanced, step 18 is followed by step 20 which constitutes the end of the balancing and the removal of the finished and balanced rim from the mandrel M of the machine.
Step 20 is followed by step 21 in which the unloaded imbalance of the mandrel M is checked and quantified, this value being used as indicated by the path 22 in the 10360/E
aforesaid subtraction step 15 for the next balancing cycle.
It will be evident that considerable financial advantages are gained by the concentration in a single machine of the functions which are currently performed by a plurality of machines, and it will also be evident that advantages in terms of precision are gained by machining the rim while it is still secured on the same mandrel as that on which it was subjected to the final step of final machining.
It is to be understood that the method described is also to be considered as protected for the dynamic balancing of parts which are different from wheel rims, but which have similar requirements. Finally, it is to be understood that the description refers to a preferred embodiment of the invention, with the omission of the details of construction of the sensors 11 , the unit 12 and the means of manipulating the rims for loading them on to the machine and removing them from it, since these details will be understood and easily implemented by persons skilled in the art.

Claims

10360/ECLAIMS
1. Equipment for the dynamic balancing of the rims of wheels of motor vehicles or other parts which have similar requirements, during the production cycle of the parts, characterized in that it comprises, in combination with the numerically controlled machine tool which finishes the said rims: one or more sensors (11 ) which operate on the mandrel (M) and/or on other parts associated with the said mandrel of the said machine tool, the said sensor or sensors being capable of producing a signal proportional to the vibrations caused by the inherent dynamic imbalance of the mandrel and of the rims which are mounted on it for machining; a calculation and processing unit (1 ) which receives the signals generated by the sensors (11 ) mentioned in the preceding clause and which, by means of suitable software and suitable programming, is capable of quantifying and locating the position in the round angle of the excess masses which cause the dynamic imbalance of the rim; a numerical control unit (7) which controls the electric motor (3) with electronic speed and phase control, with a brake, which drives the mandrel of the machine tool, which can be programmed by the preceding unit by means of at least one programming and interrogation unit (8) and which controls the operation of the unit containing the machining tools (9) which comprises any automatic and selective positioning unit and which is movable along a plurality of orthogonal axes (10); means for causing the machine tool to carry out, in addition to the normal finishing operation, the dynamic balancing of the rim, by an eccentric and/or localized turning operation.
2. Equipment according to Claim 1 , characterized in that it comprises automatic manipulation means which position the rim (C) on the mandrel (M) of the machine tool, with the area intended for the valve hole (FV) in a constant predetermined angular position, which is known to the said processing units (7, 12) which, by means of the said programming unit (8), are also provided with information on the dimensional characteristics and the eccentric position of the said hole (FV), as a 10360/E
result of which the system is capable of discriminating the extent and the position in the round angle of the vibrations caused by this hole (FV).
3. Equipment according to Claim 1 , in which the mandrel (M) of the machine tool is positioned vertically and is provided with a horizontal platform (4) with means (5, 6) for centring and fixing the rim to be machined on the platform.
4. Equipment according to Claim 1 , in which the sensor or sensors (1 1 ) act on corresponding exposed areas of the outer ring of at least one of the rotatable support bearings (2) of the shaft (1 ) of the mandrel (M) of the machine tool.
5. Equipment according to Claim 4, in which there are two of the sensors (11 ), spaced apart angularly by 90s.
6. Equipment according to Claim 1 , in which the sensors (11) used are such and/or are positioned in such a way that they detect vibrations predominantly having a radial orientation with respect to the rim to be machined.
7. Equipment according to Claim 1 , in which the sensors (11 ) used are such and/or are positioned in such a way that they detect vibrations having an axial orientation with respect to the rim to be machined.
8. Equipment according to Claim 1 , in which the sensors used are such and are positioned in such a way that they detect vibrations having a radial orientation and having an axial orientation with respect to the rim to be machined.
9. Equipment according to Claim 1 , in which the sensors (11) used consist of accelerometers with one or more axes of sensitivity.
10. Equipment according to Claim 1 , characterized in that it comprises means for causing the dynamic balancing operation to be executed after the last step of final machining of the rim and in such a way that the eccentric and localized turning operation (17) by which the dynamic balancing of the rim is executed is carried out on any suitable part of the surface of the said rim which has been finished previously.
11. Equipment according to Claim 10, characterized in that it comprises: means (14) which use the said sensors (1 1) and the said processing unit (12) to quantify and identify the position in the round angle of the vibrations produced by the mandrel (M) when the rim (C) to be balanced is mounted on it, with allowance for 10360/E
the vibrations caused temporarily by the valve hole (FV), which will be substantially compensated by the inflation valve which will be mounted in the said hole (FV) when the rim is in use; means (15) which determine the extent and the actual coordinates of the dynamic imbalance of the rim, by an operation of subtracting the vibrations (21) characterizing the dynamic imbalance of the unloaded mandrel from the vibrations deduced in loaded conditions by the preceding means (14); means (16) for carrying out, on any suitable part of the surface of the rim (C), the eccentric turning operation (17) which achieves the dynamic balancing of the said rim to the predetermined tolerances, while the said rim is made to rotate about its axis at the correct velocity; means (18) which check whether or not the balancing has been carried out correctly. If the result is negative, the values of the residual imbalance are identified and quantified, and new eccentric and/or localized turning operations are carried out to bring the dynamic balance within the predetermined tolerances. However, if the rim is found to be correctly balanced, means (20) are provided for removing it from the machine tool; means (21 ) which detect the unloaded imbalance of the mandrel of the machine tool, this value being used for the next balancing cycle of a new rim.
12. Process for the dynamic balancing of the rims of wheels of motor vehicles or other parts which have similar requirements, during the production cycle of the parts, characterized by the sequence of the following steps: Final machining of the rim by a numerically controlled machine tool; Detection of the dynamic imbalance of the finished rim which is still securely mounted on the mandrel of the finishing machine tool, the tool being provided with means for detecting this dynamic imbalance; Dynamic balancing of the finished rim by an eccentric and/or localized turning operation (17) carried out by the machine tool which was also used for finishing; Checking of the dynamic balance of the finished rim which has been subjected to the preceding step of balancing, so that the said balancing steps can be repeated if the result does not lie within the predetermined tolerances, and so that, conversely, the rim can be removed from the machine tool if acceptable values of dynamic balancing are found.
13. Process according to Claim 12, in which the eccentric and/or localized turning operation (17) is carried out, for example, on any suitable part of the lateral surface of the rim on which the tyre is to be placed.
14. Process according to Claim 12, in which, during the step of eccentric and/or localized turning of the rim (C) for its dynamic balancing, the said rim is made to rotate at a velocity in the range from 400 to 700 rpm, for example at approximately 500 rpm.
15. Process according to Claim 12, characterized in that it comprises a step of orientated positioning of the rim on the mandrel (M) of the machine tool, in such a way that the area intended for the valve hole (FV) is in a constant predetermined position which is known to the balancing system, which, in a programming step, is also provided with information on the dimensional and eccentricity characteristics of the said hole (FV).
16. Process according to Claim 12, in which, in the step of detecting the dynamic imbalance of the finished rim, the values of the imbalance of the unloaded mandrel (M) are subtracted from the values of the imbalance of the mandrel with the rim mounted on it, and allowance is also made for the temporary dynamic imbalance caused in the rim by the valve hole (FV) in a perimetric position, this temporary imbalance being substantially compensated by the subsequent fitting of the inflation valve.
PCT/EP2004/051492 2003-07-29 2004-07-14 Method and equipment for the dynamic balancing of the rims of wheels of motor vehicles WO2005012867A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04766222A EP1656540A1 (en) 2003-07-29 2004-07-14 Method and equipment for the dynamic balancing of the rims of wheels of motor vehicles

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ITBO2003A000448 2003-07-29
IT000448A ITBO20030448A1 (en) 2003-07-29 2003-07-29 "METHOD AND APPARATUS FOR THE DYNAMIC BALANCING OF CIRCLES OR RIMS OF THE WHEELS OF MOTOR VEHICLES OR OTHER PARTS WHICH CARRY ANALOGUE REQUIREMENTS DURING THE SAME PRODUCTION CYCLE"

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DE102008014835A1 (en) * 2008-03-07 2009-09-10 Chiron-Werke Gmbh & Co Kg Machine tool, in particular for wheel machining
CN104703824A (en) * 2012-07-31 2015-06-10 西卡姆有限公司 Tyre-changing machine
CN107702854A (en) * 2017-07-10 2018-02-16 北京航天动力研究所 A kind of high-speed balancing method for meeting rocket engine turbopump assembling and using
EP3564643A1 (en) * 2018-05-03 2019-11-06 AST SERVICES Sàrl Method for renovating rims and machine for renovating rims
CN111347284A (en) * 2020-04-08 2020-06-30 新代科技(苏州)有限公司 Online dynamic balance checking and adjusting device and method in lathe hub machining
IT201900002183A1 (en) 2019-02-14 2020-08-14 Imt Intermato S P A SYSTEM AND METHOD FOR BALANCING RAILWAY WHEELS

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US8172489B2 (en) 2008-03-07 2012-05-08 Chiron-Werke Gmbh & Co. Kg Machine tool, in particular for rim machining
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CN107702854A (en) * 2017-07-10 2018-02-16 北京航天动力研究所 A kind of high-speed balancing method for meeting rocket engine turbopump assembling and using
CN107702854B (en) * 2017-07-10 2019-02-15 北京航天动力研究所 A kind of high-speed balancing method for meeting rocket engine turbopump assembly and using
EP3564643A1 (en) * 2018-05-03 2019-11-06 AST SERVICES Sàrl Method for renovating rims and machine for renovating rims
IT201900002183A1 (en) 2019-02-14 2020-08-14 Imt Intermato S P A SYSTEM AND METHOD FOR BALANCING RAILWAY WHEELS
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