JP7176940B2 - How to correct the balance of a rotating body - Google Patents

Description

The present invention relates to a balance correction method for a rotating body.

A turbocharger mounted on an engine of an automobile or the like has a rotating body (a turbine wheel and a compressor wheel) that rotates using exhaust gas from the engine as a power source.

In such a rotating body, if there is an uneven weight with respect to the axis of rotation, that is, an imbalance, there is a risk that vibrations or the like will occur due to the centrifugal force caused by the imbalance during high-speed rotation. Therefore, in the manufacturing process of the rotating body, the balance of the rotating body is corrected (for example, Patent Documents 1 and 2).

JP 2011-128113 A Japanese Patent Application Laid-Open No. 2009-083005

Balance correction is performed, for example, by processing (cutting, grinding, etc.) a part of the rotating body. Shortening of life may occur. In addition, in the balance correction method in which there is a limit to the number of machining times of the rotating body, if the balance cannot be corrected within the predetermined number of machining times, the rotating body must be discarded, which may reduce the yield of the rotating body. be.

Therefore, the method for correcting the balance of a rotating body disclosed in the present specification aims at suppressing a decrease in the yield of the rotating body.

In order to solve such a problem, the method for correcting the balance of a rotating body disclosed in this specification includes a first measuring step of measuring an unbalanced amount of a rotating body before machining, and measuring in the first measuring step the unbalanced amount of the rotating body before machining, and the unbalanced amount in the three-dimensional model after the first machining of the rotating body obtained by machining simulation of the three-dimensional model of the rotating body before machining; a first calculating step of calculating a correction amount of the rotating body that can make the unbalanced amount of the rotating body smaller than before machining when the are equal to each other, and adjusting the rotating body based on the correction amount a first machining step of machining, a second measuring step of measuring an unbalanced amount of the machined rotating body, an unbalanced amount of the machined rotating body measured in the second measuring process, When the imbalance amount in the second machined three-dimensional model of the rotor obtained by the machining simulation of the machined three-dimensional model of the rotor is equal , the correction amount of the rotor is determined. a second calculating step of calculating; and a second machining step of machining the rotating body based on the correction amount calculated in the second calculating step.

According to the method for correcting the balance of a rotating body disclosed in the present specification, it is possible to suppress a decrease in yield of the rotating body.

FIG. 1 is a schematic diagram showing the configuration of a balance correction system for a rotating body according to one embodiment. FIG. 2 is a flow chart showing a procedure for correcting the balance of the rotating body according to the embodiment. FIG. 3 is a flowchart showing processing information calculation processing according to the embodiment. FIGS. 4A to 4C are diagrams for explaining the processing information calculation process according to the embodiment. FIG. 5 is a flow chart showing a procedure for correcting the balance of the rotor according to the comparative example. FIGS. 6A to 6C are diagrams for explaining processing information calculation processing in a comparative example. FIGS. 7A and 7B are diagrams illustrating machining of a rotating body in a comparative example. FIGS. 8A to 8C are diagrams for explaining machining of a rotating body in the embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, in the drawings, the dimensions, ratios, etc. of each part may not be illustrated so as to completely match the actual ones. In some drawings, details may be omitted.

FIG. 1 is a schematic diagram showing the configuration of a balance correction system 100 that applies a balance correction method for a rotating body according to one embodiment. The balance correction system 100 includes an unbalance measurement device 10, a correction processing arithmetic device 20, and a workpiece processing device 30 (for example, a milling machine, lathe, etc. for grinding or cutting).

The unbalance measuring device 10 measures the unbalance amount and the unbalance phase of a rotating body (hereinafter referred to as a workpiece) to be balanced corrected based on well-known techniques.

The correction processing arithmetic device 20 is, for example, an information processing device such as a personal computer, and includes a Central Processing Unit (CPU), Random Access Memory (RAM), Read Only Memory (ROM), and Hard Disk Drive (HDD). . The correction machining arithmetic device 20 performs machining information arithmetic processing described later based on the unbalance amount and unbalance phase of the workpiece measured by the unbalance measuring device 10, and obtains machining information of the workpiece (specifically, Specifically, the machining amount (correction amount) and machining position (phase)) are calculated. The unbalance amount and unbalance phase measured by the unbalance measuring device 10 may be manually input to the correction processing arithmetic device 20 by the operator, or may be automatically input from the unbalance measuring device 10 to the correction processing arithmetic device 20. can be entered literally.

The work processing device 30 is a device for processing (grinding, cutting, etc.) a work. For example, the operator confirms the machining information (the amount of machining and the machining position) output by the correction machining arithmetic unit 20, and manually processes the workpiece using the workpiece machining device 30 based on the machining information. Correct the balance. Alternatively, the workpiece machining device 30 may acquire the calculation result of the correction machining calculation device 20 from the correction machining calculation device 20 and automatically machine the workpiece.

Next, a balance correction procedure performed using the balance correction system 100 will be described. FIG. 2 is a flow chart showing a balance correction procedure according to this embodiment.

In FIG. 2, first, the operator measures the unbalanced amount and the unbalanced phase of the workpiece to be balanced corrected using the unbalanced measuring device 10 (step S101). Step S101 is an example of a first measurement step.

Next, the operator determines whether or not the imbalance amount is equal to or less than the first threshold (step S103). In this step, the operator determines whether the unbalance amount measured in step S101 is within the allowable error. If the imbalance amount is equal to or less than the first threshold value (step S103/YES), the worker sends the workpiece to the next process (step S121) because the balance correction is unnecessary.

On the other hand, if the imbalance amount is greater than the first threshold value (step S103/NO), the operator performs balance correction machining calculation using the correction machining calculation device 20, and calculates the amount and machining of the workpiece required for balance correction. A position is acquired (step S105). Step S105 is an example of a first calculation step.

Here, in step S105, the processing information calculation processing executed by the correction processing calculation device 20 according to the present embodiment will be described. FIG. 3 is a flowchart showing processing information calculation processing according to the present embodiment.

As shown in FIG. 3, first, the correction processing arithmetic unit 20 reads out a three-dimensional model (3D model) of a rotating body to be subjected to balance correction (step S201). The 3D model may be a 3D model of an unbalanced rotating body, or a 3D model generated from an actual workpiece (that is, a 3D model generated from an unbalanced workpiece). ).

Next, the correction processing arithmetic unit 20 performs a processing simulation of the 3D model in 3D CAD (Computer Aided Design) (step S203). More specifically, the correction processing arithmetic unit 20 performs a grinding simulation for grinding the 3D model M of the rotating body with the grinding wheel G, as shown in FIG. 4(A).

Next, the correction processing arithmetic device 20 calculates the unbalance amount of the 3D model after processing in the 3D CAD (step S205). More specifically, as shown in FIG. 4(B), the grinding wheel G and the 3D model M are superimposed, and a set operation (more specifically, product (original drawing deletion)) in 3D CAD, As shown in FIG. 4(C), the volume V of the portion to be removed from the workpiece is obtained. Then, the weight and the center of gravity of the volume V are obtained, and the unbalanced amount of the 3D model after processing is calculated. The unbalanced amount of the 3D model after processing is calculated by (the weight of the volume V)×(the distance between the axis center of the 3D model and the center of gravity of the volume V).

Next, the correction machining arithmetic device 20 determines that the unbalance amount of the 3D model obtained by the machining simulation (the 3D model after the first machining) is equal to the workpiece unbalance amount measured by the unbalance measuring device 10. It is determined whether or not (step S207).

If the determination in step S207 is negative, the correction processing arithmetic device 20 further processes the 3D model of the rotating body by processing simulation (step S209), and returns to step S205.

Then, when the unbalance amount of the 3D model (the 3D model after the first machining) obtained by the machining simulation is equal to the unbalance amount of the workpiece measured by the unbalance measuring apparatus 10, the correction machining arithmetic unit 20 (Step S207/YES), the amount of machining obtained by the machining simulation (for example, the amount of thrust of the grindstone) and the machining position calculated based on the measured imbalance phase are output as machining information (step S211).

Returning to FIG. 2, the operator processes the workpiece and corrects the balance based on the correction machining information output from the correction machining arithmetic device 20 (step S107). Step S107 is an example of a first processing step.

Subsequently, the worker uses the unbalance measuring device 10 to measure the unbalanced amount and the unbalanced phase of the workpiece after processing (step S109), and determines whether the unbalanced amount is equal to or less than the first threshold. (step S111). Step S109 is an example of a second measurement step.

If the imbalance amount is equal to or less than the first threshold value (step S111/YES), no further balance correction is required, so the operator sends the workpiece to the next process (step S121).

On the other hand, if the imbalance amount is greater than the first threshold value (step S111/NO), the operator again performs the balance correction processing calculation using the correction processing calculation device 20, and the processing amount and processing required for balance correction are calculated. A position is acquired (step S113). More specifically, in FIG. 3, the correction machining arithmetic unit 20 performs machining simulation on the 3D model of the rotating body after the balance correction machining (step S203), and the obtained remachining (second 2) The processing of steps S205 to S209 is repeated until the unbalanced amount of the 3D model of the rotating body after processing 2) becomes equal to the unbalanced amount measured in step S109. As the 3D model of the rotating body after balance correction machining, the 3D model obtained by the previous machining simulation may be used, or the actual workpiece to be machined (after balance correction machining A 3D model generated from a workpiece) may be used. Step S113 is an example of a second calculation step.

The operator processes the workpiece and corrects the balance based on the correction machining information output from the correction machining arithmetic unit 20 (step S115). Then, similarly to steps S109 and S111, steps S117 and S119 are performed. The operator repeats the processing of steps S113 to S119 until the unbalanced amount becomes equal to or less than the first threshold, and when the unbalanced amount becomes equal to or less than the first threshold (step S119/YES), the workpiece is sent to the next process. (Step S121). Step S115 is an example of a second processing step.

As described above, in the method for correcting the balance of a rotating body according to the present embodiment, if the imbalance amount does not fall within the allowable error in the first machining, the second machining is performed using the 3D model of the workpiece reflecting the machining result. Since the processing information calculation processing for the processing of (1) is performed, the processing position of the workpiece at the time of balance correction may overlap between the first time and the second time. More specifically, regardless of the number of balance corrections, the machining positions of the workpieces may overlap. This point will be described on the basis of a comparative example in which the number of workpiece machining times is limited.

FIG. 5 is a flow chart showing an example of a balance correction procedure according to a comparative example.

In FIG. 5, first, the operator uses the unbalance measuring device 10 to measure the unbalance amount and unbalance phase of the workpiece to be balanced corrected (step S11).

Next, the operator determines whether or not the unbalance amount measured in step S11 is equal to or less than a first threshold value (permissible error) (step S13).

If the imbalance amount is equal to or less than the first threshold (step S13/YES), the worker sends the workpiece to the next process (step S33) because there is no need to correct the balance.

On the other hand, if the imbalance amount is greater than the first threshold (step S13/NO), the operator determines whether or not the imbalance amount is greater than or equal to the second threshold (step S15). The second threshold value is a threshold value for determining whether the balance correction is to be completed in one process or in two processes.

Here, an overview of the processing information calculation process according to the comparative example will be described. FIG. 6A is a diagram showing the unbalance amount of the work. In FIG. 6A, the X-axis and Y-axis indicate the amount of imbalance, the center (the intersection of the X-axis and the Y-axis) corresponds to the center of the work that is the object to be processed, and the point P0 is the work. It shows the amount of imbalance. More specifically, the point P0 indicates how much imbalance occurs in the X-axis direction and the Y-axis direction. A range R1 indicated by a dotted line represents a first threshold (allowable error), and a range R2 indicated by a dashed line represents a second threshold.

In the correction processing arithmetic device according to the comparative example, when the unbalance amount measured in step S11 of FIG. 5 is equal to or less than the second threshold value (P0 exists within the range R2) (see point P0 in FIG. 6B) 2, the machining amount and machining position of the workpiece are calculated so that the imbalance amount becomes zero in one machining (see arrow A1).

On the other hand, when the unbalanced amount measured in step S11 of FIG. 6 is larger than the second threshold value (see point P0 in FIG. 6C), the first time and the For the second machining, the machining amount and machining position of the workpiece are calculated.

More specifically, first, the first machining amount and machining position are calculated so that the machining position is in the opposite phase of the current unbalanced phase. For example, if the unbalanced amount is in the first quadrant on the coordinates of FIG. Calculate the machining position. This is because the modified machining arithmetic unit according to the comparative example cannot calculate the second machining information based on the information of the workpiece reflecting the first machining result, so the second machining position (phase) is , and the first machining position (phase).

For example, when the unbalance amount measured in step S11 in FIG. 5 is indicated by point P0 in FIG. 6C, the amount of machining and the machining position Calculate Then, in the second machining, the second machining information is calculated so that the unbalanced amount moves toward the center (unbalanced amount of zero) (see arrow A3).

Therefore, in FIG. 5, when the imbalance amount is equal to or greater than the second threshold value (step S15/YES), the operator uses the correction processing calculation device to perform the balance correction processing calculation based on the processing information calculation processing described above, The location (phase) to be processed and the amount of processing are acquired (step S17).

Next, the operator processes the workpiece and corrects the balance of the workpiece based on the calculation result of the modified machining calculation device (step S19). For example, as shown in FIG. 7A, the worker processes (grinds) the first portion WP1 of the work indicated by hatching.

If the unbalance amount is equal to or greater than the second threshold value (step S15/YES), the operator uses the unbalance measuring device 10 for the second processing to complete the unbalance correction in two processing operations. , the unbalanced amount and the unbalanced phase of the workpiece after the completion of the first machining are measured (step S21).

Subsequently, the operator uses the modified machining calculation device to calculate the machining location (phase) and machining amount (step S23). Then, the operator processes the workpiece and corrects the balance of the workpiece based on the calculation result of the modified machining calculation device 20 (step S25). For example, as shown in FIG. 7B, the operator processes (grinds) the workpiece W at a location (phase) different from the first machining location (phase) (see second portion WP2).

Subsequently, the worker measures the unbalanced amount and unbalanced phase of the workpiece after the second machining is completed (step S27), and determines whether the unbalanced amount is equal to or less than the first threshold value (allowable error). (step S29).

If the imbalance amount does not become equal to or less than the first threshold value (allowable error) (step S29/NO), in the balance correction procedure according to the comparative example, the upper limit of the number of times of processing is two. cannot be processed. Therefore, the worker discards the work as a defective product (step S31).

On the other hand, if the imbalance amount is equal to or less than the first threshold (allowable error) (step S29/YES), the worker sends the workpiece to the next process (step S33).

By the way, when the imbalance amount is less than the second threshold value (step S15/NO: see FIG. 6B), the operator performs balance correction machining calculation using the correction machining calculation device, and determines the place (phase ) and the machining amount is calculated (step S35).

Next, the operator processes the workpiece and corrects the balance of the workpiece based on the calculation result of the modified machining calculation device (step S37). After that, the processes of steps S27 to S33 described above are executed.

As described above, in the balance correction method according to the comparative example, when the workpiece is machined twice, the unbalanced phase of the workpiece after the first machining is opposite to the current unbalanced phase. The amount of machining increases, and there is a risk that the machining time will increase and the life of the cutting tool will be shortened. Moreover, if the balance cannot be corrected in the second processing, the workpiece is treated as a defective product, resulting in a decrease in yield.

On the other hand, in the balance correcting method according to the present embodiment, it is possible to always target the unbalanced amount of zero in processing information arithmetic processing. For example, as shown in FIG. 8A, it is assumed that the first portion WP3 of the workpiece is machined with an unbalance amount of zero as the target. As a result, as shown in FIG. 8(B), it is assumed that the imbalance amount changes from point P0 to point P1. In this case, in the second processing information calculation process, the 3D model after processing the first portion WP3 is used to calculate the processing information so that the unbalance amount becomes zero (arrow A5 in FIG. 8B). do. As a result, for example, as shown in FIG. 8C, even if the second machining positions (second portions WP4-1 and WP4-2) overlap with the first machining positions, the calculation results are consistent. Further, even if the imbalance amount does not fall within the allowable error even after the second machining, the third machining information calculation process can be performed to perform the third balance correction. At this time, the third machining position may overlap the first and second machining positions. That is, even in the case of the workpiece whose balance could not be corrected in the comparative example because it could not be processed for the third and subsequent times, the balance correction method of the present embodiment enables the balance to be corrected, thereby preventing the yield of the workpiece from decreasing. can do. In addition, since the correction process can be subdivided into a plurality of times, it is possible to improve the accuracy of balance correction.

Further, for example, as can be seen by comparing FIG. 6(C) and FIG. 8(B), the amount of machining of the workpiece required for balance correction is reduced as a whole compared to the comparative example, so the time required for correction machining is can be shortened, and shortening of the tool life can be suppressed.

The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited to these, and various modifications of these examples are within the scope of the present invention, and furthermore, It is self-evident from the above description that many other embodiments are possible within the scope.

REFERENCE SIGNS LIST 10 Unbalance measuring device 20 Correction processing arithmetic device 30 Work processing device 100 Balance correction system W Work M 3D model

Claims (1)

a first measuring step of measuring the unbalanced amount of the rotating body before machining;
The unbalance amount of the rotating body before machining measured in the first measuring step, and the amount of unbalance of the rotating body after the first machining obtained by machining simulation of the three-dimensional model of the rotating body before machining. a first calculation step of calculating a correction amount of the rotating body that can make the unbalanced amount of the rotating body smaller than before machining when the imbalance amount in the dimensional model is equal ;
a first machining step of machining the rotating body based on the correction amount;
a second measuring step of measuring the unbalanced amount of the machined rotating body;
The unbalance amount of the machined rotating body measured in the second measuring step, and the second machining of the rotating body obtained by machining simulation of the three-dimensional model of the machined rotating body. a second calculation step of calculating a correction amount of the rotating body when the imbalance amount in the dimensional model is equal ;
a second machining step of machining the rotating body based on the correction amount calculated in the second calculating step;
A method for correcting balance of a rotating body, comprising:

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