Model ship processing high-precision CNC machining center using active vibration control technology

Abstract

Disclosed is a high-precision CNC machining center for model ship machining using an active vibration control technique. The high-precision CNC machining center for model ship machining using an active vibration control technique according to one embodiment of the present invention includes a processor equipped with a processing tool in a processing head for processing a model ship; a dust collector for preventing dust from flying by capturing dust generated during processing of the model ship; an active vibration control system for measuring vibrations occurring in the processor and the dust collector and generating an anti-vibration signal for generating an anti-vibration; and an actuator for generating an anti-vibration according to the anti-vibration signal generated from the active vibration control system and thereby preventing vibrations from occurring in the processing head of the processor.

Description

Technical Field

[0001] This invention relates to a high-precision CNC machining center for model ship machining using active vibration control technology, and more particularly to a high-precision CNC machining center for model ship machining using active vibration control technology that can minimize the transmission of various mechanical vibrations that occur during the driving of the CNC machining center to the machining head, thereby improving the machining accuracy of the model ship. Background Technology

[0002] Model tests performed to understand the hydrodynamic performance of a ship include drag tests to understand drag performance, self-propulsion tests to evaluate propulsion performance with a propeller installed, and propeller-only tests to understand the performance of the propeller itself.

[0003] Since it is difficult to grasp the performance of a ship at its actual size, the performance of the actual ship is usually inferred by conducting model tests in a towed tank after manufacturing a scaled-down model ship with the same geometric shape as the actual ship.

[0004] Factors affecting the results of model tests include environmental factors such as water temperature and humidity in the towed water tank, as well as the precision of the test equipment. However, it can be said that the manufacturing precision of the model used in the model test is the most fundamental factor.

[0005] Model ships are manufactured in the following sequence: shape modeling (CAD / CAM), raw material cutting, layered model making, CNC machining, painting, and waterline marking. Typically, model ships for research purposes are manufactured in sizes ranging from a minimum of 4m to a maximum of 12m, depending on the scaling factor. Therefore, large CNC machining centers are used for machining operations. Similar to general machining methods, roughing, semi-finishing, and finishing processes are performed sequentially. To achieve precision machining during the finishing process, minimizing the vibration of the machining head is crucial.

[0006] A spindle box structure for suppressing vibration is disclosed in Korean Patent Publication No. 10-2002-0059104.

[0007] In the prior art, a structure is disclosed for a CNC machine tool used to suppress vibration, wherein the spindle box is hollow inside, the lower part of the spindle box is a closed structure, and its internal space is filled with shock-absorbing material.

[0008] However, existing technologies cannot effectively cope with the different vibrations that change at any time, thus presenting a problem of various mechanical vibrations that occur when a CNC machining center is driven being transmitted to the machining head.

[0009] The most representative vibrations occurring in CNC machining centers are those generated from the drive motors mounted on the X / Y / Z axis tracks and shafts (screws) of the machining center, as well as from the dust collectors used to capture wood dust.

[0010] Among these factors, the vibrations occurring in the dust collector have the greatest impact. Vibrations occurring during the dust collector's operation and during the periodic dust removal process performed by the bag filter inside the dust collector can significantly affect the machining accuracy of the model ship. Therefore, the dust collector is not driven during the finishing process.

[0011] Therefore, while existing technologies can ensure the manufacturing precision of model ships during the finishing process, wood dust can disperse into the surrounding area and adversely affect the health of workers on site. (Previous Technology Documents)

[0012] Patent documents

[0013] (Patent Document 0001) Korean Patent Publication No. 10-2002-0059104 Summary of the Invention

[0014] In order to overcome the problems existing in the prior art as described above, one embodiment of the present invention provides a high-precision CNC machining center for model ship machining that utilizes active vibration control technology to improve the machining accuracy of model ships and protect the health of operators by minimizing the transmission of various mechanical vibrations to the machining head.

[0015] One aspect of the invention includes: a processor equipped with processing tools in a processing head for processing a model ship; a dust collector that prevents dust from scattering by capturing dust generated during the processing of the model ship in the processor; an active vibration control system that measures vibrations occurring in the processor and the dust collector and generates an anti-vibration signal for generating anti-vibration; and an actuator that generates anti-vibration based on the anti-vibration signal generated from the active vibration control system, thereby preventing vibration from occurring in the processing head of the processor.

[0016] The active vibration control system includes: a vibration measuring sensor for measuring the vibrations that occur; a data collection device for collecting data related to the vibrations measured by the vibration measuring sensor; and a control system for processing the data collected by the data collection device to apply active vibration control.

[0017] The control system obtains the external excitation vibration (F1) from the vibration measuring sensor and the data collection device, and generates an anti-vibration signal to cause the actuator to generate the anti-phase vibration (F2) of the external excitation vibration (F1). The vibration signal (F) formed by the superposition of the external excitation vibration (F1) and the anti-phase vibration (F2) of the external excitation vibration (F1) is transmitted to the processing head of the processor.

[0018] The control system determines whether the vibration signal (F) is less than the maximum allowable value. When the vibration signal (F) is less than the maximum allowable value, the vibration control is interrupted and processing is performed. When the vibration signal (F) is greater than the maximum allowable value, the actuator generates anti-vibration by executing vibration control.

[0019] The high-precision CNC machining center for model ship processing according to the present invention, which utilizes active vibration control technology, can achieve the following effects.

[0020] First, it can minimize the transmission of various mechanical vibrations that occur during the driving of CNC machining equipment to the machining head, thereby improving the machining accuracy of model ships.

[0021] Secondly, driving the dust collector to operate can ensure high machining accuracy even throughout the entire process of machining model ships on a CNC machining center.

[0022] Third, it can protect the health of workers by minimizing wood dust.

[0023] Fourth, it can improve the efficiency of the vibration control implemented. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating the overall operation of a high-precision numerical control (CNC) machining center for model ship processing utilizing active vibration control technology according to one embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of a high-precision CNC machining center for model ship processing that utilizes active vibration control technology according to one embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram that illustrates the elements that cause external excitation and the occurrence of vibration prevention, and illustrates the final mechanical vibration transmission location based on this.

[0027] Explanation of reference numerals in the attached figures

[0028] 1: Model Ship

[0029] 110: Processor

[0030] 112: Processing head

[0031] 114: Machining tools

[0032] 120: Dust collector

[0033] 130: Active Vibration Control System

[0034] 140: Implementing agency Detailed Implementation

[0035] The embodiments described below are merely illustrative to help those skilled in the art easily understand the technical concept of the present invention, and the present invention is not limited thereto. Furthermore, the items depicted in the accompanying drawings are schematic diagrams for the purpose of illustrating embodiments of the present invention and may differ from actual implementations.

[0036] When a constituent element is described as being connected or linked to other constituent elements, although it can be directly connected or linked to the other constituent elements, it should be understood that there can also be other constituent elements between the two.

[0037] Figure 1 This is a flowchart illustrating the overall operation of a high-precision numerical control (CNC) machining center for model ship processing utilizing active vibration control technology according to one embodiment of the present invention.

[0038] Next, the overall operation of a high-precision CNC machining center for model ship manufacturing utilizing active vibration control technology according to one embodiment of the present invention will be described. First, in step S10, external excitation is measured. That is, external excitation occurring during the operation of the machining equipment, i.e., the CNC machine tool, and the dust collector is measured.

[0039] Next, the measured data is collected in step S20, and the collected data is analyzed in step S30.

[0040] Then, in step S40, vibration control is used to generate vibration damping based on the analyzed data.

[0041] Furthermore, in step S50, the external vibrations generated during the CNC machine tool drive and dust collector drive are measured; in step S60, the measured data is collected; and in step S70, the collected data is analyzed (FFT: Fast Fourier Transform).

[0042] Next, in step S80, it is determined whether the external excitation vibration value is less than the maximum allowable value based on the analyzed data. If it is less than the maximum allowable value, vibration control is interrupted in step S90. Then, in step S100, the model ship processing is performed and the process ends.

[0043] When the external excitation vibration value exceeds the maximum allowable value, the external excitation vibration occurring during the CNC machine tool (CNC) drive and dust collector drive is re-measured in step S10, and the process described above is executed.

[0044] In some cases, external excitation can be measured and vibration control can be interrupted when the external excitation vibration value is less than the maximum allowable value, and then the process can end after the model ship processing is completed.

[0045] Figure 2 This is a schematic diagram of a high-precision CNC machining center for model ship manufacturing utilizing active vibration control technology, according to one embodiment of the present invention. Figure 3 It is a schematic diagram that illustrates the elements that cause external excitation and the occurrence of vibration prevention, and illustrates the final mechanical vibration transmission location based on this.

[0046] See also Figure 2 , Figure 3 as well as Figure 1 The high-precision numerical control (CNC) machining center for model ship processing according to the present invention, which utilizes active vibration control technology, includes a machining unit 110, a dust collector 120, an active vibration control system 130, and an actuator 140.

[0047] The machining unit 110 is a component used for machining the model ship 1, and is equipped with a machining head 112 for machining the model ship. A machining tool 114 for machining the model ship is provided at the end of the machining head 112.

[0048] The machining head 110 performs machining operations on the model ship 1 via X / Y / Z axis transfer and A / B axis rotation of the machining head 112. The X / Y / Z axes are perpendicular intersecting axes that move along a straight line, while the A / B axes are rotational axes that rotate around the X / Y perpendicular intersecting axes.

[0049] The dust collector 120 serves to capture the wood dust generated when the processor 110 processes the wooden model ship 1, thus preventing the dust from scattering.

[0050] The active vibration control system 130 includes a vibration measuring sensor, a vibration data collection device, and a control system for realizing active vibration control.

[0051] Vibration measuring sensors measure vibrations, including those occurring in the drive motor, during dust collector operation, and during the dust removal process inside the dust collector.

[0052] The vibration data collection device collects and stores data related to the vibrations measured by the vibration meter sensor.

[0053] The control system includes a microprocessor with computing capabilities, which processes the data collected by the data collection device to achieve active vibration control.

[0054] In addition, it may include a data transceiver device for sending and receiving data.

[0055] The actuator 140 generates vibration damping that is opposite to the vibration measured and analyzed by the active vibration control system 130, thereby minimizing external excitation transmitted to the machining head 112 (vibrations that occur during CNC machining center drive and dust collector drive).

[0056] Furthermore, the present invention may also include a power supply device for supplying operating power to the integral constituent elements.

[0057] See Figure 3 External excitations occurring during CNC machine tool (CNC) and dust collector drives include vibrations from the drive motors on the X / Y / Z axis tracks and shafts (screws) of the CNC machining center, vibrations occurring during dust collector drives, and vibrations occurring during the periodic dust removal process performed by the bag filters inside the dust collector. Figure 3 The first solid line S1 (vibration signal) is used to illustrate the diagram.

[0058] The external excitation that occurs will be controlled by active vibration control to eventually produce a reverse vibration (vibration damping). Figure 3 The second solid line S2 (vibration damping signal) in the diagram minimizes the mechanical vibration transmitted to the machining head. Figure 3 The third solid line S3 (residual signal) in the diagram, and the related principle are as follows.

[0059] The control system of the active vibration control system 130 obtains the external excitation vibration (F1) from the vibration measuring sensor and data collection device, and generates an anti-vibration signal to make the actuator generate the opposite vibration (F2) of the external excitation vibration (F1).

[0060] In the following formula 1), F1 represents external excitation vibration, w represents the excitation vibration frequency of the element that generates external excitation, A represents the amplitude of the vibration function, and t represents time.

[0061] Formula 1)F1=A sin(wt)

[0062] In Formula 2) below, F2 represents the anti-phase vibration generated in the actuator, a represents the amplitude difference between F1 and F2, and θ represents the phase difference between F1 and F2. It is preferable that the amplitude and phase of F1 and F2 have the same value.

[0063] Formula 2) F2 = -(A + α)sin(wt + θ)

[0064] Finally, as shown in Formula 3 below, the final vibration signal F, which is the superposition of external excitation vibration (F1) and antiphase vibration (F2), is transmitted to the processing head.

[0065] Formula 3)F1+F2=F=A sin(wt)-(A+α)sin(wt+θ)

[0066] Depending on the dynamic characteristics of the machining center, different control system algorithms for the active vibration control system 130 can be applied. These can be selected from the most commonly used Sky-Hoo, Direct Velocity Feedback (DVF) algorithms, H-infinity control theory, Quantitative Feedback Theory (QFT), or modified active control techniques. Furthermore, the data acquisition device (DAQ) and vibration measurement sensors of the active vibration control system 130 can be selected based on the frequency band of vibration to be minimized or eliminated as needed, as well as the natural frequency range of the equipment.

[0067] Therefore, the high-precision CNC machining center for model ship processing according to the present invention, which utilizes active vibration control technology, can minimize the transmission of various mechanical vibrations that occur during the CNC machining center's operation to the machining head, thereby improving the machining accuracy of the model ship. Moreover, high machining accuracy can be ensured even when the dust collector is driven throughout the entire model ship machining process at the CNC machining center, and the health of operators can be protected by minimizing wood dust.

[0068] Those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above are merely preferred embodiments selected from among many possible embodiments to help those skilled in the art understand the present invention. The technical concept of the present invention is not limited or restricted by the proposed embodiments. The present invention can be subject to various changes, additions, and modifications without departing from its technical concept, and can also be implemented through other equivalent embodiments.

Claims

1. A high-precision CNC machining center for model ship processing utilizing active vibration control technology, characterized in that, The high-precision CNC machining center for model ship processing utilizing active vibration control technology includes: A machining head is equipped with machining tools for machining model ships. A dust collector prevents dust from scattering by capturing the dust generated during the processing of the model ship in the processor. An active vibration control system measures the vibrations occurring in the processor and the dust collector and generates vibration-damping signals for vibration reduction; and The actuator generates anti-vibration signals based on the active vibration control system, thereby preventing vibration from occurring in the machining head of the processor. The processor processes the wooden model ship. The dust collector operates at least during the finishing process of the model ship to capture wood dust generated during the processing of the model ship. The active vibration control system includes: The vibration measuring sensor measures the vibrations occurring in the drive motor of the processor, the vibrations occurring when the dust collector is driven, and the vibrations occurring during the periodic dust removal process of the bag filter inside the dust collector as external excitation vibrations. The data collection device collects data related to the externally excited vibrations detected by the vibration meter sensor; and The control system calculates the external excitation vibration (F1) by analyzing the data collected by the data collection device, and generates the anti-vibration signal to cause the actuator to generate the opposite vibration (F2) of the external excitation vibration. The actuator generates the anti-phase vibration (F2) according to the anti-vibration signal, and transmits the vibration signal (F) formed by the superposition of the external excitation vibration (F1) and the anti-phase vibration (F2) to the processing head.

2. The high-precision CNC machining center for model ship processing utilizing active vibration control technology according to claim 1, characterized in that, The control system determines whether the vibration signal (F) is less than the maximum allowable value. Vibration control is interrupted when the vibration signal (F) is less than the maximum allowable value. Vibration control is performed when the vibration signal (F) exceeds the maximum permissible value.

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