CN114393436B - Auxiliary driving device of numerical control machine tool - Google Patents
Auxiliary driving device of numerical control machine tool Download PDFInfo
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- CN114393436B CN114393436B CN202210014708.7A CN202210014708A CN114393436B CN 114393436 B CN114393436 B CN 114393436B CN 202210014708 A CN202210014708 A CN 202210014708A CN 114393436 B CN114393436 B CN 114393436B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to an auxiliary driving device of a numerical control machine tool, which comprises a driving unit, a clamping unit, a sliding unit and a central control module. According to the numerical control machine tool, the transmission disc and the output disc are arranged in the sliding unit, the output transmission is performed between the transmission disc and the output disc in a friction transmission mode, when the cutting machining stress of the numerical control machine tool to be assisted is greatly fluctuated, the rotation speed fluctuation of the numerical control machine tool spindle is effectively reduced through the auxiliary driving of the numerical control machine tool spindle by the driving motor, the spindle driving stability of the numerical control machine tool spindle is maintained, the machining control precision can be effectively improved, the quality of a machined part is improved, meanwhile, the machining state of the numerical control machine tool in the cutting machining process is monitored by the central control module, the auxiliary driving parameters of the auxiliary driving device are adjusted according to the machining state, the spindle driving stability of the numerical control machine tool spindle can be effectively maintained, and the rotation speed fluctuation of the numerical control machine tool spindle is reduced.
Description
Technical Field
The invention relates to the technical field of numerical control machines, in particular to an auxiliary driving device of a numerical control machine.
Background
The numerical control machine tool is a digital control machine tool for short, and is an automatic machine tool equipped with a program control system, said control system can logically process and decode the program defined by control code or other symbolic instruction, and can use coded digital representation, and can utilize information carrier to input it into numerical control device, and can utilize the numerical control device to give out various control signals to control the action of machine tool so as to automatically machine the part according to the form and size required by drawing.
The driving part of the numerical control machine is a driving part of a numerical control machine execution mechanism and comprises a main shaft driving unit, a feeding unit, a main shaft motor, a feeding motor and the like, but in the actual production process, due to the influence of the volume or the material of a processed workpiece, the stress of a cutting mechanism generates large fluctuation, the main shaft motor is unstable in driving of the main shaft, and the processing precision of the workpiece is influenced.
Disclosure of Invention
Therefore, the invention provides an auxiliary driving device for a numerical control machine tool, which is used for overcoming the problem that a spindle motor in the prior art is unstable in driving a spindle of the numerical control machine tool.
In order to achieve the above object, the present invention provides an auxiliary driving device for a numerical control machine, comprising,
the driving unit is internally provided with a driving motor with adjustable rotating speed, the output end of the driving motor is provided with a transmission rod, and the transmission rod can rotate along with the rotation of the driving motor; the lower part of the driving motor is provided with a connecting plate for fixing the auxiliary driving device on a numerical control machine tool to be assisted; the upper part of the driving motor is provided with a heat dissipation device used for controlling the internal temperature of the driving motor;
the clamping unit is internally provided with an output shaft, one side of the output shaft is provided with a clamping block, and the clamping block can be clamped with a main shaft of the numerical control machine tool to be assisted and is used for carrying out auxiliary driving on the numerical control machine tool to be assisted; the other side of the output shaft is provided with a fixed block for transmitting rotation output to the output shaft;
the sliding unit comprises a transmission disc and an output disc, the transmission disc is connected with the transmission rod, and the output disc is connected with the fixed block; the transmission disc is sleeved outside the output disc and can drive the output disc to rotate through friction transmission; the transmission disc is provided with a friction control device for adjusting the friction coefficient between the transmission disc and the output disc and controlling the transmission of the rotating torque;
the central control module is respectively connected with the driving motor and the friction control device, is also connected with an external numerical control machine tool to be assisted, and can acquire the real-time rotating speed and the real-time cutting stress of a main shaft of the numerical control machine tool to be assisted; the central control module can select a stress standard according to the real-time rotating speed of the main shaft to judge the real-time cutting stress and control and adjust the auxiliary real-time rotating speed of the driving motor according to a judgment result; the central control module can adjust the friction coefficient of the friction control device according to the real-time rotating speed of the main shaft and the auxiliary real-time rotating speed, and performs feedback adjustment on the auxiliary real-time rotating speed of the driving motor according to the adjustment quantity of the friction coefficient.
Further, a first preset rotating speed V1 and a second preset rotating speed V2 are arranged in the central control module, wherein V1 is smaller than V2, a first standard stress N1, a second standard stress N2 and a third standard stress N3 are further arranged in the central control module, wherein N1 is smaller than N2 and smaller than N3, when the numerical control machine tool to be assisted performs workpiece processing, the central control module acquires the real-time rotating speed Va of the main shaft of the numerical control machine tool to be assisted, the central control module compares the real-time rotating speed Va of the main shaft with the first preset rotating speed V1 and the second preset rotating speed V2,
when Va is smaller than V1, the central control module judges that the real-time rotating speed of the spindle is lower than a first preset rotating speed, and the central control module selects a first standard stress N1 as a standard stress;
when the voltage Va is more than or equal to V1 and less than or equal to V2, the central control module judges that the real-time rotating speed of the spindle is between a first preset rotating speed and a second preset rotating speed, and the central control module selects a second standard stress N2 as a standard stress;
when Va is larger than V2, the central control module judges that the real-time rotating speed of the spindle is higher than a second preset rotating speed, and the central control module selects a third standard stress N3 as a standard stress.
Furthermore, a standard stress difference Δ Nb is arranged in the central control module, after the central control module selects the standard stress Nb, wherein b is 1, 2 and 3, the central control module obtains the cutting real-time stress Ns of the numerical control machine tool to be assisted, and calculates the cutting real-time stress difference Δ Ns according to the cutting real-time stress Ns and the standard stress Nb, wherein Δ Ns is | Nb-Ns |, the central control module compares the cutting real-time stress difference Δ Ns with the standard stress difference Δ Nb,
when the delta Ns is less than or equal to the delta Nb, the central control module judges that the cutting real-time stress difference is within a standard range, and the central control module controls the driving motor and the main shaft of the numerical control machine tool to be assisted to carry out rotation speed synchronization, so that the auxiliary real-time rotation speed of the driving motor is the same as the main shaft real-time rotation speed;
and when the delta Ns is larger than the delta Nb, the central control module judges that the cutting real-time stress difference is not in the standard range, and the central control module compares the cutting real-time stress with the standard stress to determine the real-time cutting state of the numerical control machine tool to be assisted.
Furthermore, the central control module is internally provided with an initial friction coefficient Uc of the friction control device, when the central control module judges that the cutting real-time stress difference is not in the standard range, the central control module compares the cutting real-time stress Ns with the standard stress Nb,
when Ns is larger than Nb, the central control module judges that the cutting real-time stress exceeds a standard range, the central control module adjusts the auxiliary real-time rotating speed of the driving motor to be constant Vs, Vs is Va, the auxiliary real-time rotating speed of the driving motor is not synchronous with the real-time rotating speed of the spindle, and the central control module adjusts the friction coefficient of the friction control device to be Uc ', Uc' ═ Uc + Uc x [ (Ns-Nb)/Nb ];
and when Ns is less than Nb, the central control module judges that the cutting real-time stress is lower than a standard range, the central control module stops the operation of the driving motor, and the central control module does not adjust the initial friction coefficient of the friction control device.
Further, when the central control module judges that the cutting real-time stress exceeds the standard range, the central control module adjusts the auxiliary real-time rotating speed of the driving motor to be constant Vs, when the central control module detects that the real-time rotating speed of the spindle changes, the central control module compares the real-time rotating speed Va' of the spindle with the auxiliary real-time rotating speed Vs,
when Va' is less than Vs, the central control module judges that the real-time rotating speed of the main shaft is lower than the auxiliary real-time rotating speed, and the central control module adjusts the auxiliary real-time rotating speed of the driving motor according to the real-time rotating speed of the main shaft and the auxiliary real-time rotating speed;
when Va' is equal to Vs, the central control module judges that the real-time rotating speed of the spindle is equal to the auxiliary real-time rotating speed, and the central control module does not adjust the auxiliary driving device;
when Va' is greater than Vs, the central control module judges that the real-time rotating speed of the spindle is higher than the auxiliary real-time rotating speed, and the central control module adjusts the friction coefficient of the friction control device according to the real-time rotating speed of the spindle and the auxiliary real-time rotating speed.
Furthermore, a friction speed difference parameter K, K > 0 is set in the central control module, when the central control module determines that the real-time spindle rotation speed is lower than the auxiliary real-time spindle rotation speed, the central control module calculates a standard rotation speed difference Δ Vb, Δ Vb ═ K × Uc 'in the state according to the friction speed difference parameter K and the friction coefficient Uc', the central control module calculates an auxiliary real-time rotation speed difference Δ Vs, Δ Vs ═ Vs 'according to the real-time spindle rotation speed Va' and the auxiliary real-time spindle rotation speed Vs, the central control module compares the auxiliary real-time rotation speed difference Δ Vs with the standard rotation speed difference Δ Vb,
when the delta Vs is less than or equal to the delta Vb, the central control module judges that the auxiliary real-time rotating speed difference is within a standard range, and the central control module judges that the auxiliary driving device is in a standard state and does not adjust the auxiliary driving device;
when the delta Vs is larger than the delta Vb, the central control module judges that the auxiliary real-time rotating speed difference is not in a standard range, and the central control module adjusts the rotating speed of the driving motor to enable the auxiliary driving device to be in a standard state.
Further, when the central control module judges that the auxiliary real-time rotating speed difference is not in the standard range, the central control module acquires the cutting real-time stress Ns ', the central control module compares the cutting real-time stress Ns' with the cutting real-time stress Ns at the adjusting moment,
when Ns' is greater than Ns, the central control module judges that the cutting real-time stress is increased, and the central control module does not adjust the auxiliary real-time rotating speed of the driving motor;
when Ns ' is less than or equal to Ns, the central control module judges that the real-time cutting stress is not increased, and the central control module adjusts the auxiliary real-time rotating speed of the driving motor to be Vs ', and Vs is Vs x (Ns '/Ns).
Further, when the central control module determines that the real-time spindle rotation speed is higher than the auxiliary real-time spindle rotation speed, the central control module calculates a standard rotation speed difference Δ Vb ', Δ Vb ' ═ K × Uc ' in the state according to the friction speed difference parameter K and the friction coefficient Uc ', the central control module calculates an auxiliary real-time rotation speed difference Δ Vs ', Δ Vs ═ Vs-Va ' according to the real-time spindle rotation speed Va ' and the auxiliary real-time spindle rotation speed Vs, the central control module compares the auxiliary real-time rotation speed difference Δ Vs ' with the standard rotation speed difference Δ Vb ',
when the delta Vs 'is less than or equal to the delta Vb', the central control module judges that the auxiliary real-time rotating speed difference is within a standard range, and the central control module judges that the auxiliary driving device is in a standard state and does not adjust the auxiliary driving device;
when the delta Vs 'is larger than the delta Vb', the central control module judges that the auxiliary real-time rotating speed difference is not in a standard range, and the central control module adjusts the rotating speed of the driving motor and the friction coefficient of the friction control device so as to enable the auxiliary driving device to be in a standard state.
Further, when the central control module determines that the auxiliary real-time rotating speed difference delta Vs ' is not in the standard range, the central control module acquires the cutting real-time stress Ns ', the central control module compares the cutting real-time stress Ns ' with the cutting real-time stress Ns at the adjusting moment,
when Ns & lt ' & gt Ns, the central control module judges that the cutting real-time stress is increased, and adjusts the auxiliary real-time rotating speed of the driving motor to be Vs & lt ' & gt Va & lt ';
when Ns is less than or equal to Ns, the central control module judges that the real-time cutting stress is not increased, and the central control module adjusts the friction coefficient of the friction control device to be Uc ═ Uc' × (Ns "/Ns).
Further, a maximum rotation speed difference Δ Vh is arranged in the central control module, the central control module calculates an auxiliary real-time rotation speed difference Δ Vs ″, which is | Vs-Va |, according to the auxiliary real-time rotation speed Vs of the driving motor and the main shaft real-time rotation speed Va at any time, the central control module compares the maximum rotation speed difference Δ Vh with the auxiliary real-time rotation speed difference Δ Vs ″,
when the delta Vh is larger than or equal to the delta Vs', the central control module judges that the auxiliary real-time rotation speed difference does not exceed the maximum rotation speed difference, and the central control module normally adjusts the friction coefficient and the auxiliary real-time rotation speed according to the cutting real-time stress and the auxiliary real-time rotation speed;
and when the delta Vh is less than the delta Vs', the central control module judges that the auxiliary real-time rotation speed difference exceeds the maximum rotation speed difference, controls the friction control device to adjust the friction coefficient between the transmission disc and the output disc to be the minimum value in the adjustment range, and stops the operation of the driving motor.
Compared with the prior art, the invention has the advantages that the transmission disc and the output disc are arranged in the sliding unit, the friction transmission mode is adopted to carry out output transmission between the transmission disc and the output disc, when the cutting processing stress of the numerical control machine tool to be assisted generates larger fluctuation, the auxiliary driving of the driving motor to the main shaft of the numerical control machine tool effectively reduces the rotation speed fluctuation of the main shaft of the numerical control machine tool, maintains the stable driving of the main shaft of the numerical control machine tool, meanwhile, the machining control precision can be effectively improved, the quality of a machined part is improved, and meanwhile, by arranging the central control module, the method monitors the processing state of the numerical control machine tool in the cutting processing process, and adjusts the auxiliary driving parameters of the auxiliary driving device according to the processing state, so that the main shaft driving stability of the main shaft of the numerical control machine tool can be more effectively maintained, and the rotation speed fluctuation of the main shaft of the numerical control machine tool is reduced.
Furthermore, the standard stress value corresponding to the preset rotating speed interval and the interval is set in the central control module, the central control module selects the standard stress value of the auxiliary data machine tool in the current state according to the comparison between the real-time rotating speed of the main shaft and each preset rotating speed interval, the range of the set stress standard can be effectively reduced, the central control module controls the auxiliary data machine tool and the auxiliary driving device to reach a more accurate state through the range of the more accurate stress standard, and the normal operation of the auxiliary driving device is guaranteed.
Particularly, a standard stress difference is arranged in the central control module, the cutting real-time stress difference is calculated according to the cutting real-time stress and the standard stress, the standard stress difference is compared with the cutting real-time stress difference, whether the cutting real-time stress exceeds a standard stress range in the current state or not is judged, the judged real-time stress is controlled within a certain range, the stress can be preliminarily judged, the deceleration judging times are judged according to the range, the calculated amount of the central control module is reduced, the service life of the central control module is prolonged, and when the cutting real-time stress difference is judged to be not in the standard range by the central control module, judgment is carried out according to the specific difference value of the cutting real-time stress and the standard stress, the real-time cutting state of the numerical control machine tool to be assisted is accurately determined, and the auxiliary driving device can normally run.
Furthermore, an initial friction coefficient is set in the friction control device, the transmission disc and the output disc are firstly transmitted through the initial friction coefficient, and when the central control module determines that the cutting real-time stress exceeds the standard range, the central control module determines that the initial friction coefficient is increased and adjusted according to the cutting real-time stress and the standard stress, so that the driving force of the auxiliary driving device on the main shaft of the numerical control machine tool is ensured, the phenomenon that the rotating speed of the main shaft of the numerical control machine tool is reduced too much due to the fact that the cutting stress in real time is large and the large rotating speed fluctuation occurs is avoided, and the stability of the driving of the main shaft of the numerical control machine tool is ensured.
Particularly, when the central control module judges that the cutting real-time stress exceeds the standard range, the central control module also adjusts the auxiliary real-time rotating speed of the driving motor to be constant Vs, monitors the main shaft of the numerical control machine tool, compares the changed real-time rotating speed of the main shaft with the auxiliary real-time rotating speed, selects different adjusting modes according to different comparison results, monitors and compares the rotating speed of the main shaft of the numerical control machine tool through the central control module, on one hand, the adjusting effect of the auxiliary driving device is checked, on the other hand, the real-time machining state of the numerical control machine tool can be determined, and the stability of the machining state is guaranteed.
Particularly, a friction speed difference parameter is arranged in the central control module, a standard rotation speed difference range is calculated through the friction speed difference parameter and a friction coefficient in the state, the standard rotation speed difference between the driving motor and a main shaft of the numerical control machine tool is changed along with the change of the friction coefficient of the friction control device, a constant parameter is set, a calculated standard rotation speed difference is accurate, the difference value between the actual real-time rotation speed of the main shaft and the auxiliary real-time rotation speed is compared through the standard rotation speed difference, whether the auxiliary driving device is in the standard state or not can be accurately determined, the normal operation of the auxiliary driving device is guaranteed, and the service life of the auxiliary driving device is prolonged.
Further, when the central control module judges that the auxiliary real-time rotating speed difference is not within the standard range, large stress exists between the transmission disc and the output disc, whether positive effect exists in the stress between the transmission disc and the output disc is judged by detecting the change of cutting real-time stress, and when the cutting real-time stress is not increased, the stress between the transmission disc and the output disc is not increased, so that the auxiliary real-time rotating speed of the driving motor is improved, the stress between the transmission disc and the output disc is lower, and the service life of the transmission disc and the service life of the output disc are prolonged.
Further, when the central control module determines that the real-time rotating speed of the main shaft is higher than the auxiliary real-time rotating speed, the central control module calculates a standard rotating speed difference in the state according to the friction speed difference parameter and the friction coefficient, compares the difference value between the real-time rotating speed of the main shaft and the auxiliary real-time rotating speed, determines whether the auxiliary driving device is in a standard state, and adjusts the rotating speed of the driving motor and the friction coefficient of the friction control device when the central control module determines that the auxiliary real-time rotating speed difference is not within a standard range, so as to maintain the normal operation of the auxiliary driving device.
Further, when the central control module judges that the auxiliary real-time rotation speed difference is not within the standard range, the central control module adjusts the auxiliary driving device according to the change of the cutting real-time stress, when the cutting real-time stress is increased compared with a former state, the fact that the rotation speed of the numerical control machine main shaft is influenced by reduction is shown, the auxiliary real-time rotation speed is increased and adjusted, fluctuation of the rotation speed change of the numerical control machine main shaft is responded, the stability of the numerical control machine main shaft driving is further improved, when the cutting real-time stress is reduced compared with the former state, the friction coefficient of the friction control device is correspondingly reduced and adjusted according to the stress reduction condition, the load of the numerical control machine main shaft driving is reduced, and meanwhile, normal operation of the auxiliary driving device is guaranteed.
Furthermore, the maximum rotation speed difference is set in the central control module, the auxiliary real-time rotation speed difference and the main shaft real-time rotation speed difference are compared with each other in real time, when the auxiliary real-time rotation speed difference and the main shaft real-time rotation speed difference exceed the maximum rotation speed difference, the friction coefficient between the transmission disc and the output disc is adjusted to be the minimum value in the adjusting range, the situation that unnecessary potential safety hazards are caused due to large friction between the transmission disc and the output disc caused by large rotation speed difference and large friction coefficient is avoided, and the safety of the auxiliary driving device is effectively improved by setting the maximum rotation speed difference in the central control module.
Drawings
Fig. 1 is a schematic structural diagram of an auxiliary driving device of a numerical control machine tool according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, which is a schematic structural diagram of an auxiliary driving device of a numerical control machine according to the present invention, the present invention discloses an auxiliary driving device of a numerical control machine, including a driving unit 1, a driving motor 101, a transmission rod 102, a connecting plate 103, a heat dissipation device 104, a locking unit 2, an output shaft 201, a locking block 202, a fixed block 203, a sliding unit 3, a transmission disc 301, an output disc 302, a friction control device 303, and a central control module (not shown in the figure), wherein,
the driving unit 1 is internally provided with a driving motor 101 with adjustable rotating speed, the output end of the driving motor 101 is provided with a transmission rod 102, and the transmission rod 102 can rotate along with the rotation of the driving motor 101; a connecting plate 103 is arranged at the lower part of the driving motor 101 and used for fixing the auxiliary driving device on a numerical control machine tool to be assisted; the upper part of the driving motor 101 is provided with a heat dissipation device 104 for controlling the internal temperature of the driving motor 101;
the clamping unit 2 is internally provided with an output shaft 201, one side of the output shaft 201 is provided with a clamping block 202, and the clamping block 202 can be clamped with a spindle of a numerical control machine tool to be assisted and is used for carrying out auxiliary driving on the numerical control machine tool to be assisted; a fixed block 203 is arranged on the other side of the output shaft 201 and used for transmitting rotation output to the output shaft 201;
the sliding unit 3 comprises a transmission disc 301 and an output disc 302, the transmission disc 301 is connected with the transmission rod 102, and the output disc 302 is connected with the fixed block 203; the transmission disc 301 is sleeved outside the output disc 302, and the transmission disc 301 can drive the output disc 302 to rotate through friction transmission; the transmission disc 301 is provided with a friction control device 303 for adjusting the friction coefficient between the transmission disc 301 and the output disc 302 and controlling the transmission of the rotating torque;
the central control module is respectively connected with the driving motor 101 and the friction control device 303, is also connected with an external numerical control machine tool to be assisted, and can acquire the real-time rotating speed and the real-time cutting stress of a main shaft of the numerical control machine tool to be assisted; the central control module can select a stress standard according to the real-time rotating speed of the main shaft to judge the real-time cutting stress and control and adjust the auxiliary real-time rotating speed of the driving motor 101 according to a judgment result; the central control module can adjust the friction coefficient of the friction control device 303 according to the real-time rotating speed of the main shaft and the auxiliary real-time rotating speed, and perform feedback adjustment on the auxiliary real-time rotating speed of the driving motor 101 according to the adjustment quantity of the friction coefficient.
By arranging the transmission disc 301 and the output disc 302 in the sliding unit 3, the friction transmission mode is adopted to carry out output transmission between the transmission disc 301 and the output disc 302, when the cutting stress of the numerical control machine tool to be assisted generates large fluctuation, the auxiliary driving of the driving motor 101 to the main shaft of the numerical control machine tool effectively reduces the rotation speed fluctuation of the main shaft of the numerical control machine tool, maintains the stable driving of the main shaft of the numerical control machine tool, meanwhile, the machining control precision can be effectively improved, the quality of a machined part is improved, and meanwhile, by arranging the central control module, the method monitors the processing state of the numerical control machine tool in the cutting processing process, and adjusts the auxiliary driving parameters of the auxiliary driving device according to the processing state, so that the main shaft driving stability of the main shaft of the numerical control machine tool can be more effectively maintained, and the rotation speed fluctuation of the main shaft of the numerical control machine tool is reduced.
Specifically, a first preset rotating speed V1 and a second preset rotating speed V2 are arranged in the central control module, wherein V1 is less than V2, a first standard stress N1, a second standard stress N2 and a third standard stress N3 are further arranged in the central control module, wherein N1 is less than N2 and less than N3, when the auxiliary numerical control machine tool is used for processing a workpiece, the central control module obtains the real-time rotating speed Va of the main shaft of the auxiliary numerical control machine tool, the central control module compares the real-time rotating speed Va of the main shaft with the first preset rotating speed V1 and the second preset rotating speed V2,
when Va is smaller than V1, the central control module judges that the real-time rotating speed of the spindle is lower than a first preset rotating speed, and the central control module selects a first standard stress N1 as a standard stress;
when the voltage Va is more than or equal to V1 and less than or equal to V2, the central control module judges that the real-time rotating speed of the spindle is between a first preset rotating speed and a second preset rotating speed, and the central control module selects a second standard stress N2 as a standard stress;
when Va is larger than V2, the central control module judges that the real-time rotating speed of the spindle is higher than a second preset rotating speed, and the central control module selects a third standard stress N3 as a standard stress.
The standard stress value corresponding to the preset rotating speed interval and the interval is set in the central control module, the central control module selects the standard stress value of the auxiliary numerical control machine tool in the current state according to the comparison between the real-time rotating speed of the main shaft and each preset rotating speed interval, the range of the set stress standard can be effectively reduced, the central control module controls the auxiliary numerical control machine tool and the auxiliary driving device to reach a more accurate state through the range of the more accurate stress standard, and the normal operation of the auxiliary driving device is guaranteed.
Specifically, a standard stress difference Δ Nb is arranged in the central control module, after the central control module selects the standard stress Nb, wherein b is 1, 2 and 3, the central control module obtains a cutting real-time stress Ns of the numerical control machine tool to be assisted, and calculates the cutting real-time stress difference Δ Ns according to the cutting real-time stress Ns and the standard stress Nb, wherein Δ Ns is | Nb-Ns |, the central control module compares the cutting real-time stress difference Δ Ns with the standard stress difference Δ Nb,
when the delta Ns is less than or equal to the delta Nb, the central control module judges that the cutting real-time stress difference is within a standard range, and the central control module controls the driving motor 101 and a main shaft of the numerical control machine tool to be assisted to carry out rotation speed synchronization, so that the auxiliary real-time rotation speed of the driving motor 101 is the same as the main shaft real-time rotation speed;
and when the delta Ns is larger than the delta Nb, the central control module judges that the cutting real-time stress difference is not in the standard range, and the central control module compares the cutting real-time stress with the standard stress to determine the real-time cutting state of the numerical control machine tool to be assisted.
The method comprises the steps of setting a standard stress difference in the central control module, calculating a cutting real-time stress difference according to the cutting real-time stress and the standard stress, comparing the standard stress difference with the cutting real-time stress difference, judging whether the cutting real-time stress exceeds a standard stress range in the current state, controlling the judged real-time stress in a certain range, achieving the function of preliminary judgment on the stress, judging the deceleration judgment times through the range, reducing the calculated amount of the central control module, prolonging the service life of the central control module, judging according to the specific difference value of the cutting real-time stress and the standard stress when the central control module judges that the cutting real-time stress difference is not in the standard range, accurately determining the real-time cutting state of the numerical control machine tool to be assisted, and enabling the auxiliary driving device to operate normally.
Specifically, the central control module is provided with an initial friction coefficient Uc of the friction control device 303, when the central control module determines that the cutting real-time stress difference is not within the standard range, the central control module compares the cutting real-time stress Ns with the standard stress Nb,
when Ns is greater than Nb, the central control module determines that the cutting real-time stress exceeds a standard range, the central control module adjusts the auxiliary real-time rotation speed of the driving motor 101 to be a constant Vs, Vs is Va, the auxiliary real-time rotation speed of the driving motor 101 is not synchronous with the real-time rotation speed of the spindle, and the central control module adjusts the friction coefficient of the friction control device 303 to be Uc ', Uc' ═ Uc + Uc x [ (Ns-Nb)/Nb ];
when Ns is less than Nb, the central control module judges that the cutting real-time stress is lower than a standard range, the central control module stops the operation of the driving motor 101, and the central control module does not adjust the initial friction coefficient of the friction control device 303.
An initial friction coefficient is set in the friction control device 303, the transmission disc 301 and the output disc 302 are firstly transmitted through the initial friction coefficient, and when the central control module determines that the cutting real-time stress exceeds the standard range, the central control module determines that the initial friction coefficient is increased and adjusted according to the cutting real-time stress and the standard stress, so that the driving force of the auxiliary driving device on the main shaft of the numerical control machine tool is ensured, the phenomenon that the rotating speed of the main shaft of the numerical control machine tool is reduced too much due to the fact that the cutting stress is large in real time, and large rotating speed fluctuation occurs is avoided, and the driving stability of the main shaft of the numerical control machine tool is ensured.
Specifically, when the central control module determines that the cutting real-time stress exceeds the standard range, the central control module adjusts the auxiliary real-time rotating speed of the driving motor 101 to be a constant Vs, when the central control module detects that the real-time rotating speed of the spindle changes, the central control module compares the real-time rotating speed Va' of the spindle with the auxiliary real-time rotating speed Vs,
when Va' is less than Vs, the central control module judges that the real-time rotating speed of the spindle is lower than the auxiliary real-time rotating speed, and the central control module adjusts the auxiliary real-time rotating speed of the driving motor 101 according to the real-time rotating speed of the spindle and the auxiliary real-time rotating speed;
when Va' is equal to Vs, the central control module judges that the real-time rotating speed of the spindle is equal to the auxiliary real-time rotating speed, and the central control module does not adjust the auxiliary driving device;
when Va' is greater than Vs, the central control module judges that the real-time rotating speed of the spindle is higher than the auxiliary real-time rotating speed, and the central control module adjusts the friction coefficient of the friction control device 303 according to the real-time rotating speed of the spindle and the auxiliary real-time rotating speed.
When the central control module judges that the cutting real-time stress exceeds the standard range, the central control module also adjusts the auxiliary real-time rotating speed of the driving motor 101 to be constant Vs, monitors the main shaft of the numerical control machine tool, compares the changed main shaft real-time rotating speed with the auxiliary real-time rotating speed, selects different adjusting modes according to different comparison results, monitors and compares the main shaft rotating speed of the numerical control machine tool through the central control module, on one hand, the adjusting effect of the auxiliary driving device is checked, on the other hand, the real-time machining state of the numerical control machine tool can be determined, and the stability of the machining state is guaranteed.
Specifically, a friction speed difference parameter K, K > 0 is set in the central control module, when the central control module determines that the real-time spindle rotation speed is lower than the auxiliary real-time spindle rotation speed, the central control module calculates a standard rotation speed difference Δ Vb under the state according to the friction speed difference parameter K and the friction coefficient Uc ', the Δ Vb is K × Uc', the central control module calculates an auxiliary real-time rotation speed difference Δ Vs according to the real-time spindle rotation speed Va 'and the auxiliary real-time spindle rotation speed Vs, the Δ Vs is Vs — Va', the central control module compares the auxiliary real-time rotation speed difference Δ Vs with the standard rotation speed difference Δ Vb,
when the delta Vs is less than or equal to the delta Vb, the central control module judges that the auxiliary real-time rotating speed difference is within a standard range, and the central control module judges that the auxiliary driving device is in a standard state and does not adjust the auxiliary driving device;
when Δ Vs > Δ Vb, the central control module determines that the auxiliary real-time rotation speed difference is not within the standard range, and the central control module adjusts the rotation speed of the driving motor 101 to enable the auxiliary driving device to be in the standard state.
The friction speed difference parameter is arranged in the central control module, the standard speed difference range is calculated through the friction speed difference parameter and the friction coefficient in the state, the standard speed difference between the driving motor 101 and the main shaft of the numerical control machine tool is changed along with the change of the friction coefficient of the friction control device 303, the calculated standard speed difference is accurate through setting a constant parameter, and the actual real-time rotating speed of the main shaft is compared with the difference value of the auxiliary real-time rotating speed through the standard speed difference, so that whether the auxiliary driving device is in the standard state or not can be accurately determined, the normal operation of the auxiliary driving device is guaranteed, and the service life of the auxiliary driving device is prolonged.
Specifically, when the central control module judges that the auxiliary real-time rotating speed difference is not in the standard range, the central control module acquires the cutting real-time stress Ns ', the central control module compares the cutting real-time stress Ns' with the cutting real-time stress Ns at the adjusting moment,
when Ns' > Ns, the central control module judges that the cutting real-time stress is increased, and the central control module does not adjust the auxiliary real-time rotating speed of the driving motor 101;
when Ns ' is less than or equal to Ns, the central control module judges that the real-time cutting stress is not increased, and adjusts the auxiliary real-time rotating speed of the driving motor 101 to Vs ', wherein Vs is Vs x (Ns '/Ns).
When the central control module judges that the auxiliary real-time rotating speed difference is not within the standard range, a large stress exists between the transmission disc 301 and the output disc 302, whether the stress between the transmission disc 301 and the output disc 302 has a positive effect is judged by detecting the change of cutting real-time stress, and when the cutting real-time stress is not increased, the stress between the transmission disc 301 and the output disc 302 does not play a positive effect, so that the auxiliary real-time rotating speed of the driving motor 101 is improved, the stress between the transmission disc 301 and the output disc 302 is lower, and the service lives of the transmission disc 301 and the output disc 302 are prolonged.
Specifically, when the central control module determines that the real-time spindle rotation speed is higher than the auxiliary real-time spindle rotation speed, the central control module calculates a standard rotation speed difference Δ Vb ', where Δ Vb ' is K × Uc ' in the state according to the friction speed difference parameter K and the friction coefficient Uc ', the central control module calculates an auxiliary real-time rotation speed difference Δ Vs ', where Δ Vs is Vs-Va ' according to the real-time spindle rotation speed Va ' and the auxiliary real-time spindle rotation speed Vs, and the central control module compares the auxiliary real-time rotation speed difference Δ Vs ' with the standard rotation speed difference Δ Vb ',
when the delta Vs 'is less than or equal to the delta Vb', the central control module judges that the auxiliary real-time rotating speed difference is within a standard range, and the central control module judges that the auxiliary driving device is in a standard state and does not adjust the auxiliary driving device;
when Δ Vs '> Δ Vb', the central control module determines that the auxiliary real-time rotation speed difference is not within the standard range, and the central control module adjusts the rotation speed of the driving motor 101 and the friction coefficient of the friction control device 303 so as to enable the auxiliary driving device to be in a standard state.
Similarly, when the central control module determines that the real-time rotating speed of the main shaft is higher than the auxiliary real-time rotating speed, the central control module calculates a standard rotating speed difference in the state according to the friction speed difference parameter and the friction coefficient, compares the difference value between the real-time rotating speed of the main shaft and the auxiliary real-time rotating speed, determines whether the auxiliary driving device is in a standard state, and adjusts the rotating speed of the driving motor 101 and the friction coefficient of the friction control device 303 when the central control module determines that the auxiliary real-time rotating speed difference is not within a standard range, so as to maintain the normal operation of the auxiliary driving device.
Specifically, when the central control module determines that the auxiliary real-time rotating speed difference delta Vs ' is not in the standard range, the central control module acquires the cutting real-time stress Ns ', the central control module compares the cutting real-time stress Ns ' with the cutting real-time stress Ns at the adjusting moment,
when Ns '> Ns, the central control module judges that the cutting real-time stress is increased, the central control module adjusts the auxiliary real-time rotating speed of the driving motor 101 to be Vs';
when Ns is less than or equal to Ns, the central control module judges that the real-time cutting stress is not increased, and the central control module adjusts the friction coefficient of the friction control device 303 to be Uc, and the Uc is equal to Uc' × (Ns "/Ns).
When the central control module judges that the auxiliary real-time rotation speed difference is not within the standard range, the central control module adjusts the auxiliary driving device according to the change of the cutting real-time stress, when the cutting real-time stress is increased compared with the former state, the rotation speed of the numerical control machine spindle is indicated to be influenced by reduction, the auxiliary real-time rotation speed is increased and adjusted, the fluctuation of the rotation speed change of the numerical control machine spindle is responded, the stability of the numerical control machine spindle driving is further improved, when the cutting real-time stress is reduced compared with the former state, the friction coefficient of the friction control device 303 is correspondingly reduced and adjusted according to the stress reduction condition, the load of the numerical control machine spindle driving is reduced, and the normal operation of the auxiliary driving device is also ensured.
Specifically, the central control module is provided with a maximum rotation speed difference Δ Vh, the central control module calculates an auxiliary real-time rotation speed difference Δ Vs ″, where Δ Vs ″ -is | Vs — Va |, according to the auxiliary real-time rotation speed Vs of the driving motor 101 and the main shaft real-time rotation speed Va at any time, the central control module compares the maximum rotation speed difference Δ Vh with the auxiliary real-time rotation speed difference Δ Vs ″,
when the delta Vh is larger than or equal to the delta Vs', the central control module judges that the auxiliary real-time rotation speed difference does not exceed the maximum rotation speed difference, and the central control module normally adjusts the friction coefficient and the auxiliary real-time rotation speed according to the cutting real-time stress and the auxiliary real-time rotation speed;
when Δ Vh is less than Δ Vs ", the central control module determines that the auxiliary real-time rotation speed difference exceeds the maximum rotation speed difference, and controls the friction control device 303 to adjust the friction coefficient between the transmission disc 301 and the output disc 302 to a minimum value within an adjustment range, and stops the operation of the driving motor 101.
The maximum rotation speed difference is set in the central control module, the auxiliary real-time rotation speed and the main shaft real-time rotation speed difference are compared with the maximum rotation speed difference in real time, when the auxiliary real-time rotation speed and the main shaft real-time rotation speed difference exceed the maximum rotation speed difference, the friction coefficient between the transmission disc 301 and the output disc 302 is adjusted to be the minimum value in the adjusting range, unnecessary potential safety hazards caused by large friction between the transmission disc 301 and the output disc 302 due to large rotation speed difference and large friction coefficient are avoided, and the safety of the auxiliary driving device is effectively improved by setting the maximum rotation speed difference in the central control module.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An auxiliary driving device of a numerical control machine tool is characterized by comprising,
the driving unit is internally provided with a driving motor with adjustable rotating speed, the output end of the driving motor is provided with a transmission rod, and the transmission rod can rotate along with the rotation of the driving motor; the lower part of the driving motor is provided with a connecting plate for fixing the auxiliary driving device on a numerical control machine tool to be assisted; the upper part of the driving motor is provided with a heat dissipation device used for controlling the internal temperature of the driving motor;
the clamping unit is internally provided with an output shaft, one side of the output shaft is provided with a clamping block, and the clamping block can be clamped with a main shaft of the numerical control machine tool to be assisted and is used for carrying out auxiliary driving on the numerical control machine tool to be assisted; the other side of the output shaft is provided with a fixed block for transmitting rotation output to the output shaft;
the sliding unit comprises a transmission disc and an output disc, the transmission disc is connected with the transmission rod, and the output disc is connected with the fixed block; the transmission disc is sleeved outside the output disc and can drive the output disc to rotate through friction transmission; the transmission disc is provided with a friction control device for adjusting the friction coefficient between the transmission disc and the output disc and controlling the transmission of the rotating torque;
the central control module is respectively connected with the driving motor and the friction control device, is also connected with an external numerical control machine tool to be assisted, and can acquire the real-time rotating speed and the real-time cutting stress of a main shaft of the numerical control machine tool to be assisted; the central control module can select a stress standard according to the real-time rotating speed of the main shaft to judge the real-time cutting stress and control and adjust the auxiliary real-time rotating speed of the driving motor according to a judgment result; the central control module can adjust the friction coefficient of the friction control device according to the real-time rotating speed of the main shaft and the auxiliary real-time rotating speed, and performs feedback adjustment on the auxiliary real-time rotating speed of the driving motor according to the adjustment quantity of the friction coefficient.
2. The auxiliary driving device of numerical control machine according to claim 1, wherein the central control module is provided with a first preset rotating speed V1 and a second preset rotating speed V2, wherein V1 is smaller than V2, the central control module is further provided with a first standard stress N1, a second standard stress N2 and a third standard stress N3, wherein N1 is smaller than N2 and smaller than N3, the central control module obtains the real-time rotating speed Va of the main shaft of the numerical control machine to be assisted when the numerical control machine to be assisted performs workpiece machining, the central control module compares the real-time rotating speed Va of the main shaft with the first preset rotating speed V1 and the second preset rotating speed V2,
when Va is smaller than V1, the central control module judges that the real-time rotating speed of the spindle is lower than a first preset rotating speed, and the central control module selects a first standard stress N1 as a standard stress;
when the voltage Va is more than or equal to V1 and less than or equal to V2, the central control module judges that the real-time rotating speed of the spindle is between a first preset rotating speed and a second preset rotating speed, and the central control module selects a second standard stress N2 as a standard stress;
when Va is larger than V2, the central control module judges that the real-time rotating speed of the spindle is higher than a second preset rotating speed, and the central control module selects a third standard stress N3 as a standard stress.
3. The auxiliary driving device of numerical control machine tool according to claim 2, wherein the central control module is provided with a standard stress difference Δ Nb, after the central control module selects the standard stress Nb, wherein b is 1, 2, 3, the central control module obtains the cutting real-time stress Ns of the numerical control machine tool to be assisted, and calculates the cutting real-time stress difference Δ Ns according to the cutting real-time stress Ns and the standard stress Nb, and the central control module compares the cutting real-time stress difference Δ Ns with the standard stress difference Δ Nb,
when the delta Ns is less than or equal to the delta Nb, the central control module judges that the cutting real-time stress difference is within a standard range, and the central control module controls the driving motor and the main shaft of the numerical control machine tool to be assisted to carry out rotation speed synchronization, so that the auxiliary real-time rotation speed of the driving motor is the same as the main shaft real-time rotation speed;
and when the delta Ns is larger than the delta Nb, the central control module judges that the cutting real-time stress difference is not in the standard range, and the central control module compares the cutting real-time stress with the standard stress to determine the real-time cutting state of the numerical control machine tool to be assisted.
4. The auxiliary driving apparatus for a numerical control machine according to claim 3, wherein the central control module is provided therein with an initial friction coefficient Uc of the friction control device, and when the central control module determines that the cutting real-time stress difference is not within a standard range, the central control module compares the cutting real-time stress Ns with the standard stress Nb,
when Ns is larger than Nb, the central control module judges that the cutting real-time stress exceeds a standard range, the central control module adjusts the auxiliary real-time rotating speed of the driving motor to be constant Vs, Vs is Va, the auxiliary real-time rotating speed of the driving motor is not synchronous with the real-time rotating speed of the spindle, and the central control module adjusts the friction coefficient of the friction control device to be Uc ', Uc' ═ Uc + Uc x [ (Ns-Nb)/Nb ];
and when Ns is less than Nb, the central control module judges that the cutting real-time stress is lower than a standard range, the central control module stops the operation of the driving motor, and the central control module does not adjust the initial friction coefficient of the friction control device.
5. The auxiliary driving apparatus of numerical control machine tool according to claim 4, wherein the central control module adjusts the auxiliary real-time rotation speed of the driving motor to be a constant Vs when the central control module determines that the cutting real-time stress is out of the standard range, compares the spindle real-time rotation speed Va' with the auxiliary real-time rotation speed Vs when the central control module detects the change of the spindle real-time rotation speed,
when Va' is less than Vs, the central control module judges that the real-time rotating speed of the main shaft is lower than the auxiliary real-time rotating speed, and the central control module adjusts the auxiliary real-time rotating speed of the driving motor according to the real-time rotating speed of the main shaft and the auxiliary real-time rotating speed;
when Va' is equal to Vs, the central control module judges that the real-time rotating speed of the spindle is equal to the auxiliary real-time rotating speed, and the central control module does not adjust the auxiliary driving device;
when Va' is greater than Vs, the central control module judges that the real-time rotating speed of the spindle is higher than the auxiliary real-time rotating speed, and the central control module adjusts the friction coefficient of the friction control device according to the real-time rotating speed of the spindle and the auxiliary real-time rotating speed.
6. The auxiliary driving apparatus of a numerical control machine according to claim 5, wherein the central control module has a friction speed difference parameter K, K > 0, when the central control module determines that the real-time spindle rotation speed is lower than the auxiliary real-time spindle rotation speed, the central control module calculates a standard rotation speed difference Δ Vb, Δ Vb ═ KxUc 'in this state according to the friction speed difference parameter K and the friction coefficient Uc', the central control module calculates an auxiliary real-time rotation speed difference Δ Vs, Δ Vs-Va 'according to the real-time spindle rotation speed Va' and the auxiliary real-time rotation speed Vs, the central control module compares the auxiliary real-time rotation speed difference Δ Vs with the standard rotation speed difference Δ Vb,
when the delta Vs is less than or equal to the delta Vb, the central control module judges that the auxiliary real-time rotating speed difference is within a standard range, and the central control module judges that the auxiliary driving device is in a standard state and does not adjust the auxiliary driving device;
when the delta Vs is larger than the delta Vb, the central control module judges that the auxiliary real-time rotating speed difference is not in a standard range, and the central control module adjusts the rotating speed of the driving motor so as to enable the auxiliary driving device to be in a standard state.
7. The auxiliary driving apparatus of numerical control machine tool according to claim 6, wherein the central control module acquires the cutting real-time stress Ns 'when the central control module determines that the auxiliary real-time rotation speed difference is not within the standard range, the central control module compares the cutting real-time stress Ns' with the cutting real-time stress Ns at the adjusting time,
when Ns' is greater than Ns, the central control module judges that the cutting real-time stress is increased, and the central control module does not adjust the auxiliary real-time rotating speed of the driving motor;
when Ns ' is less than or equal to Ns, the central control module judges that the real-time cutting stress is not increased, and the central control module adjusts the auxiliary real-time rotating speed of the driving motor to be Vs ', and Vs is Vs x (Ns '/Ns).
8. The auxiliary driving apparatus of a numerical control machine according to claim 7, wherein when the central control module determines that the real-time spindle rotation speed is higher than the auxiliary real-time spindle rotation speed, the central control module calculates a standard rotation speed difference Δ Vb ', Δ Vb ' ═ KxUc ' in the state according to the friction speed difference parameter K and the friction coefficient Uc ', the central control module calculates an auxiliary real-time rotation speed difference Δ Vs ', Δ Vs-Vs ', according to the real-time spindle rotation speed Va ' and the auxiliary real-time spindle rotation speed Vs, the central control module compares the auxiliary real-time rotation speed difference Δ Vs ' with the standard rotation speed difference Δ Vb ',
when the delta Vs 'is less than or equal to the delta Vb', the central control module judges that the auxiliary real-time rotating speed difference is within a standard range, and the central control module judges that the auxiliary driving device is in a standard state and does not adjust the auxiliary driving device;
when the delta Vs 'is larger than the delta Vb', the central control module judges that the auxiliary real-time rotating speed difference is not in a standard range, and the central control module adjusts the rotating speed of the driving motor and the friction coefficient of the friction control device so as to enable the auxiliary driving device to be in a standard state.
9. The auxiliary driving apparatus of a numerical control machine according to claim 8, wherein when the central control module determines that the auxiliary real-time rotational speed difference Δ Vs' is not within the standard range, the central control module obtains the cutting real-time stress Ns ", the central control module compares the cutting real-time stress Ns" with the cutting real-time stress Ns at the adjusting time,
when Ns & lt ' & gt Ns, the central control module judges that the cutting real-time stress is increased, and adjusts the auxiliary real-time rotating speed of the driving motor to be Vs & lt ' & gt Va & lt ';
when Ns is less than or equal to Ns, the central control module judges that the real-time cutting stress is not increased, and the central control module adjusts the friction coefficient of the friction control device to be Uc ═ Uc' × (Ns "/Ns).
10. The auxiliary driving apparatus of numerical control machine according to claim 9, wherein the central control module has a maximum speed difference Δ Vh, the central control module calculates an auxiliary real-time speed difference Δ Vs "from the auxiliary real-time speed Vs of the driving motor and the main spindle real-time speed Va at any time, Δ Vs" ═ Vs-Va ", the central control module compares the maximum speed difference Δ Vh with the auxiliary real-time speed difference Δ Vs",
when the delta Vh is larger than or equal to the delta Vs', the central control module judges that the auxiliary real-time rotation speed difference does not exceed the maximum rotation speed difference, and the central control module normally adjusts the friction coefficient and the auxiliary real-time rotation speed according to the cutting real-time stress and the auxiliary real-time rotation speed;
and when the delta Vh is less than the delta Vs', the central control module judges that the auxiliary real-time rotation speed difference exceeds the maximum rotation speed difference, controls the friction control device to adjust the friction coefficient between the transmission disc and the output disc to be the minimum value in the adjustment range, and stops the operation of the driving motor.
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