CN111786614A - Active temperature control device and method for high-precision coordinate boring servo motor - Google Patents
Active temperature control device and method for high-precision coordinate boring servo motor Download PDFInfo
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- CN111786614A CN111786614A CN202010742014.6A CN202010742014A CN111786614A CN 111786614 A CN111786614 A CN 111786614A CN 202010742014 A CN202010742014 A CN 202010742014A CN 111786614 A CN111786614 A CN 111786614A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
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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
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
-
- 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
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
-
- 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
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/007—Arrangements for observing, indicating or measuring on machine tools for managing machine functions not concerning the tool
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Automatic Control Of Machine Tools (AREA)
Abstract
The high-precision coordinate boring servo motor temperature active control device comprises a servo motor body, wherein an adjustable mounting support is arranged on the outer side of the servo motor body, a control proportional valve is arranged on the adjustable mounting support and is arranged at a cooling gas path main outlet, an annular gas path is connected to the rear portion of the control proportional valve and is used for forming a redundant cooling pipeline, an adjustable gas blowing opening is formed in the adjustable mounting support, the rear end of the direction adjustable gas blowing opening is connected with a gas flow monitoring element, the gas flow monitoring element is used for detecting the actual gas flow of each cooling opening, the gas flow monitoring element is connected to the main annular gas path through a pipeline, cooling gas flow is output to the annular gas path through the control proportional valve, and the direction adjustable gas blowing opening carries out covering cooling on the servo motor body.
Description
Technical Field
The invention relates to the technical field of high-precision numerical control horizontal coordinate boring machines, in particular to a temperature active control device and a temperature active control method for a servo motor of a high-precision coordinate boring machine.
Background
The high-precision numerical control horizontal coordinate boring machine has extremely strict requirements on the temperature of the using environment, the environment temperature field, the temperature of the rotating heating component of the machine tool and the temperature rising speed. If the ambient temperature, the ambient temperature field and the temperature of the rotating heating component of the machine tool greatly disturb or continuously change, the actual use performance of the machine tool is greatly influenced, the comprehensive cutting precision of the machine tool is finally influenced, and the position degree of the processed workpiece can be seriously deviated to cause the rejection of the workpiece.
The use environment of the traditional high-precision numerical control horizontal coordinate boring machine is a constant-temperature workshop, and the fluctuation of an external temperature field has little influence on the performance of the machine tool due to the strict control of the external environment temperature and the temperature field. Meanwhile, the machine tool body is also independently provided with a plurality of temperature control systems of rotating heating components, for example, a feed shaft screw is configured as a central water-cooling screw, a screw seat and a bearing are configured with a water-cooling device, and a main shaft is configured with a circulating oil cooling or water-cooling system, so that the heat generated by each rotating heating component of the machine tool in the motion process is strictly controlled. And a passive temperature compensation device is also configured for each feed shaft and is used for compensating coordinate drift caused by temperature and temperature field changes, so that the positioning and repeated positioning precision of the machine tool is ensured. However, in various temperature control methods, the heat generated by the servo motors of the feed shaft and the main shaft in the use process is not effectively and actively controlled, and the influence of the heat generated in the operation process on the performance of the machine tool is released, so that the influence of the heat on the machine tool needs to be effectively reduced and finally eliminated by closed-loop control.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-precision coordinate boring servo motor temperature active control device and a control method thereof, which are used for carrying out temperature fusion on the servo motor temperature in different states and the ambient temperature according to different control methods, accelerating the fusion of a microscopic annular temperature field around the servo motor, finally controlling the temperature rise amount and the temperature rise speed of the motor, and greatly reducing the thermal deformation of a machine tool caused by the temperature rise of the motor, thereby ensuring the processing precision of the machine tool.
In order to achieve the purpose, the invention adopts the technical scheme that:
the high-precision coordinate boring servo motor temperature active control device comprises a servo motor body 1, an adjustable mounting bracket 2 is arranged on the outer side of the servo motor body 1, the adjustable mounting bracket 2 is provided with a control proportional valve 3, the control proportional valve 3 is arranged at the main outlet of the cooling gas path, the rear part of the control proportional valve 3 is connected with an annular gas path 4, be used for forming redundant formula cooling line, adjustable installing support 2 on be provided with the debuggable mouth of blowing 6, the rear end that the mouth 6 was blown in the direction is connected gas flow monitoring component 5, gas flow monitoring component 5 is used for detecting the actual airflow of each cooling port, gas flow monitoring component 5 is connected to total annular gas circuit 4 through the pipeline, cooling gas is exported to annular gas circuit 4 through control proportional valve 3, the direction debuggable mouth 6 of blowing carry out the overlay type cooling to servo motor body 1.
The adjustable mounting bracket 2 is L-shaped, is provided with four and is fixedly mounted on the servo motor body 1 through adjustable bolts and nuts.
The corners of the four L-shaped adjustable mounting brackets 2 are respectively provided with four adjustable air blowing openings 6.
The active temperature control method for the high-precision numerical control horizontal coordinate boring servo motor comprises the following steps;
when a machine tool is powered on, the servo motor body 1 transmits the actual temperature value of the servo motor body 1 to a driving module through a motor control cable, the data is stored in numerical control system driving parameters R35, secondary development system parameters are connected with a data energy block, a PLC program function block is called to read the data through an NC driving bus and store the data into a PLC data area, and the environmental temperature of the microscopic temperature field at the position of the servo motor body 1 is input into an analog quantity input module through an analog quantity signal cable through a motor room temperature monitoring sensor arranged near the servo motor body 1; at the moment, the PLC program analyzes and judges the collected motor temperature and room temperature data;
if the temperature of the servo motor body 1 is lower than the room temperature at the moment, whether the temperature of the servo motor body 1 is lower than the room temperature by 2 ℃ is judged again, if the temperature of the servo motor body 1 is lower than the room temperature by 2 ℃, the PLC program is used for calculating, the analog quantity output module is controlled by the control bus to send out control voltage corresponding to the program, the control proportional valve 3 is controlled by the analog quantity control cable to be in a non-connection or closed state, so that no cooling air flow circulates in the annular air passage 4, and no cooling air flow is output from the direction-adjustable air blowing port 6 arranged on the adjustable mounting support 2; if the temperature of the servo motor body 1 is lower than the room temperature but not lower than the room temperature by 2 ℃, the PLC program controls the output of a set minimum cooling capacity voltage value through the analog output module 1, controls the proportional valve 3 to be in a set minimum cooling opening state through an analog control cable, is connected to a direction-adjustable air blowing port 6 arranged on the adjustable mounting bracket 2 through an annular air passage 4, does not output cooling air flow, performs continuous pre-cooling, judges whether the temperature of the motor is higher than the room temperature by 2 ℃ again if the temperature of the servo motor body 1 is higher than the room temperature at the moment, and if the temperature of the servo motor body 1 is not higher than the room temperature by 2 ℃, the PLC program uses a PID control mode to adjust the output voltage of the proportional valve 3 in real time, and finally controls the cooling flow of the direction-adjustable air blowing port; if the temperature of the servo motor body 1 is higher than the room temperature by 2 ℃, the PLC program can control the proportional control valve 3 to be completely opened, the motor is forcibly cooled by using strong cooling airflow, and the temperature of the motor is reduced to a controllable range in a short time.
The invention has the beneficial effects that:
the servo motor temperature active control device combines the combined action of traditional screw rod cooling, bearing cooling and passive temperature compensation, and can guarantee the precision of the high-precision horizontal numerical control coordinate boring machine in an all-round manner. The system is a system integration technology combining mechanical design, electrical control and pneumatic control. The control method is different from the control mode of compensating the variable quantity after the temperature of the traditional release motor rises, the temperature rise quantity and the temperature rise speed of the motor can be clamped under the active control of the temperature of the servo motor, the temperature is preprocessed in advance, meanwhile, the micro temperature field is accelerated to reach balance through the disturbance of cooling air flow in the environment where each feed shaft and the spindle motor of the machine tool are installed, and the influence caused by the temperature rise of the motor is relieved fundamentally.
The servo motor temperature active control device is popularized and applied in a plurality of high-precision numerical control horizontal coordinate boring series products such as TGK46 series, THM46 series, TGK65 series and the like of the company, the usability of a machine tool is improved, and good social and economic benefits are obtained. Meanwhile, the cooling control mode can be popularized and applied to the cooling of the screw rod and the bearing, and the traditional cooling mode is replaced. However, because the servo motor temperature active control device uses a large number of analog quantity signals and needs to be provided with a considerable number of analog quantity input and output modules, the manufacturing cost is overhigh, detection and control elements can not be used in a common numerical control machine tool with not very harsh use precision, only a cooling device body is arranged, and a good motor temperature rise clamping effect can be realized.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is an electrical control interconnection diagram of the active temperature control device of the servo motor according to the present invention.
FIG. 3 is a PLC control flow chart of the servo motor temperature active control device of the present invention.
Fig. 4 is a schematic view of the adjustable mounting bracket 2.
Fig. 5 is a schematic view of an adjustable blow port 6.
Fig. 6 is a schematic view of the gas flow rate monitoring element 5.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1: adjustable installing support 2 including four block built-up connections, and with adjustable bolt and nut fixed mounting on servo motor body 1, adjust adjustable installing support 2's mounting dimension according to actual motor size of a dimension, with connect reliable and stable, control proportional valve 3 installs in cooling gas circuit total exit, be fixed in on adjustable installing support 2, annular gas circuit 4 is connected to its rear portion, be used for forming redundant formula cooling line, set up four adjustable direction blowing mouth 6 respectively in four L type adjustable installing support 2's corner, the rear end connection gas flow monitoring component 5 of the adjustable direction blowing mouth 6 is used for detecting each cooling mouth actual gas flow, gas flow monitoring component 5 is connected to total annular gas circuit 4 through the pipeline. The cooling air flow is output to an annular air passage 4 through a control proportional valve 3, and finally the servo motor is subjected to covering cooling through a direction-adjustable air blowing opening 6 through detection feedback of an air flow monitoring element 5.
The servo motor body is provided with a mounting bracket which can be freely adjusted according to the size of the overall dimension of the motor so as to adapt to any type of servo motors configured by different numerical control systems. The whole support is divided into four blocks which are connected through bolts, and the connecting bolts are used for adjusting the overall size of the actual motor according to the actual motor overall size configured by different numerical control systems, so that the outer side of the servo motor is reliably fixed. And cooling output ports capable of freely adjusting the cooling direction are arranged at four vertexes of the mounting bracket and used for outputting cooling air flow to carry out all-dimensional covering type cooling on the servo motor. The connection between each cooling output port adopts redundant design, forms the ring pipeline and connects to prevent that single-point pipeline from blockking up the back and causing can not normally blow gas and cool. And each cooling output port is provided with a gas flow monitoring element for monitoring the pressure air flow of each cooling output port in real time so as to form closed-loop monitoring on the gas circuit. And a proportional valve is configured at the output port of the main gas path, and after the PLC program reads the state of each state, the PLC program outputs a corresponding control signal according to a set control model to control the opening state of the proportional valve.
As shown in fig. 2: a set of servo motor temperature active control device is provided with an analog quantity temperature sensor, four analog quantity gas flow sensors and an analog quantity control proportional valve, and all servo motors of the machine tool are provided with a set of motor temperature active control device to be used in a large amount to analog quantity input and output modules. Connecting four analog quantity gas flow sensors configured on a single device to an analog quantity input module by using shielded cables; a total of six analog quantity temperature sensors for detecting room temperature, which are configured by all devices, are respectively connected to the two analog quantity input modules by using shielded cables; a total of six analog quantity control proportional valves for controlling cooling flow rate, which are configured by all devices, are respectively connected to the two analog quantity output modules by using shielded cables; this can save the use of modules considerably.
The NC driving bus is connected to each shaft driving module, the motor control cable and the feedback cable are connected to each feeding shaft and the main shaft servo motor, temperature signals acquired by a driver from a servo motor internal temperature sensor in the numerical control system are read in PLC program control, and the arrangement of the motor temperature sensor is not carried out.
As shown in fig. 3: the PLC program is used for controlling the servo motor temperature active control device, so that the temperature rise amount and the rise speed of the servo motor can be accurately controlled, and the influence of heat generated by the servo motor in operation on a machine tool is effectively relieved. The PLC control algorithm of the servo motor temperature active control device is divided into 4 modes for discussion:
mode 1: when the temperature of the motor is lower than the room temperature and the temperature difference is more than or equal to 2 ℃, the proportional valve is closed.
Mode 2: when the temperature of the motor is lower than the room temperature and the temperature difference is less than 2 ℃, the proportional valve is opened according to the set minimum cooling capacity.
Mode 3: when the temperature of the motor is higher than the room temperature and the temperature difference is less than 2 ℃, the proportional valve is controlled in real time according to a PID control mode.
Mode 4: when the temperature of the motor is higher than the room temperature and the temperature difference is more than 2 ℃, the proportional valve is completely opened, and the forced cooling mode is started.
When the machine tool starts to operate in a normal cold state, firstly reading the internal temperature of the servo motor and the actual working condition environment temperature of the machine tool, comparing the two temperature values, and judging whether the current motor temperature is lower than the room temperature; at the moment, because the machine tool is in a power-off shutdown state in the earlier stage, the detected temperature of the motor is the same as the room temperature and cannot be lower than the room temperature in a state without external cooling; at the moment, a proportional valve control signal is output according to the set lowest cooling flow rate than a PLC program, the servo motor is clamped for temperature rise, and the motor temperature rise is prevented and controlled in advance. If the machine tool is in a power-on static state at any time, and any feed shaft and main shaft do not move, the temperature of the motor cannot be further increased, but is lower than the room temperature along with the cooling operation, and when the PLC detects that the temperature of the motor is lower than the room temperature by 2 ℃, the proportional valve is closed to output and cut off the cooling, and the performance of the machine tool body is also influenced because the temperature of the motor is too lower than the room temperature.
If the machine tool is not always in a static state but performs machining and cutting movement after being started, when the temperature of the motor is increased but does not exceed the room temperature by 2 ℃, the PLC program uses an FB58 'TCONT _ CP' functional block in an OB35 organization block to control the temperature processing process of continuous signals, sets the FB58 functional block GAIN as a negative value to perform pure cooling operation, and simultaneously starts PID operation to control the opening state position of the proportional valve according to the actual motor temperature and the room temperature as input variables to perform accurate control. If the temperature of the motor is detected to be too high and the temperature of the motor exceeds the room temperature by 2 ℃, the PID regulation function is closed, the control quantity of the proportional valve is set to be the maximum value, the motor is completely cooled by opening, the temperature rise of the motor is controlled in a short time, and the temperature of the motor returns to the controlled range. Therefore, the working condition temperature of the servo motor can be kept within a certain range only by adopting different control modes under different working conditions, so that the continuous change of the local temperature field of the machine tool caused by the temperature rise of the motor is relieved, and meanwhile, the performance consistency of the machine tool is ensured due to the effect of cooling airflow, so that the local temperature field of the machine tool reaches the effect of rapid balance.
Claims (4)
1. The high-precision coordinate boring servo motor temperature active control device is characterized by comprising a servo motor body (1), wherein an adjustable mounting bracket (2) is arranged on the outer side of the servo motor body (1), a control proportional valve (3) is arranged on the adjustable mounting bracket (2), the control proportional valve (3) is arranged at a cooling gas path main outlet, an annular gas path (4) is connected to the rear part of the control proportional valve (3) and used for forming a redundant cooling pipeline, an adjustable gas blowing opening (6) is arranged on the adjustable mounting bracket (2), a gas flow monitoring element (5) is connected to the rear end of the direction adjustable gas blowing opening (6) and used for detecting the actual gas flow of each cooling opening, the gas flow monitoring element (5) is connected to the main annular gas path (4) through a pipeline, and the cooling gas flow is output to the annular gas path (4) through the control proportional valve (3), the direction-adjustable air blowing port (6) is used for performing covering cooling on the servo motor body (1).
2. The active temperature control device for the high-precision coordinate boring servo motor according to claim 1, wherein the adjustable mounting brackets (2) are L-shaped, four in number, and are fixedly mounted on the servo motor body (1) through adjustable bolts and nuts.
3. The active temperature control device for the high-precision coordinate boring servo motor according to claim 1, wherein four direction-adjustable air blowing ports (6) are respectively arranged at corners of the four L-shaped adjustable mounting brackets (2).
4. The method for actively controlling the temperature of the high-precision numerical control horizontal coordinate boring servo motor according to claim 1, is characterized by comprising the following steps;
when a machine tool is powered on, the servo motor body (1) transmits the actual temperature value of the servo motor body (1) to a driving module through a motor control cable, the data is stored in numerical control system driving parameters R35, secondary development system parameters are connected with a data energy block, a PLC program function block is called to read the data through an NC driving bus and store the data into a PLC data area, and the microcosmic temperature field environment temperature of the position where the servo motor body (1) is located is input into an analog quantity input module through an analog quantity signal cable through a motor room temperature monitoring sensor arranged near the servo motor body (1); at the moment, the PLC program analyzes and judges the collected motor temperature and room temperature data;
if the temperature of the servo motor body (1) is lower than the room temperature at the moment, whether the temperature of the servo motor body (1) is lower than the room temperature by 2 ℃ is judged again, if the temperature of the servo motor body (1) is lower than the room temperature by 2 ℃, the PLC program is used for calculating, the analog quantity output module is controlled by the control bus to send out control voltage corresponding to the program, the control proportional valve (3) is controlled by the analog quantity control cable to be in a non-connection or closed state, so that no cooling air flow circulates in the annular air passage (4), and no cooling air flow is output from the direction-adjustable air blowing port (6) which is connected to the adjustable mounting bracket (2); if the temperature of the servo motor body (1) is lower than the room temperature but not lower than 2 ℃, the PLC program controls the output of the set voltage value with the lowest cooling capacity through the analog output module (1), the proportional valve (3) is controlled to be in a set minimum cooling opening state through an analog quantity control cable, the direction-adjustable air blowing port (6) which is connected to the adjustable mounting bracket (2) through the annular air passage (4) is not output with cooling air flow, continuous pre-cooling is carried out, if the temperature of the servo motor body (1) is higher than the room temperature, whether the temperature of the motor is higher than the room temperature by 2 ℃ is judged again, if the temperature of the servo motor body (1) is not higher than the room temperature by 2 ℃, the PLC program uses a PID control mode to adjust the output voltage of the control proportional valve (3) in real time, and finally the cooling flow of the direction-adjustable air blowing port (6) is controlled; if the temperature of the servo motor body (1) is higher than the room temperature by 2 ℃, the PLC program can control the proportional control valve (3) to be completely opened, the motor is forcibly cooled by using strong cooling airflow, and the temperature of the motor is reduced to a controllable range in a short time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010742014.6A CN111786614A (en) | 2020-07-22 | 2020-07-22 | Active temperature control device and method for high-precision coordinate boring servo motor |
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| CN202010742014.6A CN111786614A (en) | 2020-07-22 | 2020-07-22 | Active temperature control device and method for high-precision coordinate boring servo motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114161225A (en) * | 2021-12-10 | 2022-03-11 | 上海诺倬力机电科技有限公司 | Five first intelligent feedback devices and machine tool |
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2020
- 2020-07-22 CN CN202010742014.6A patent/CN111786614A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114161225A (en) * | 2021-12-10 | 2022-03-11 | 上海诺倬力机电科技有限公司 | Five first intelligent feedback devices and machine tool |
| CN114161225B (en) * | 2021-12-10 | 2024-04-26 | 上海诺倬力机电科技有限公司 | Five spindle nose intelligent feedback devices and machine tool |
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Address after: No.23, Ciba Road, Panlong District, Kunming, Yunnan 650203 Applicant after: General technology Group Kunming Machine Tool Co.,Ltd. Address before: No.23, Ciba Road, Panlong District, Kunming, Yunnan 650203 Applicant before: SHENJI GROUP KUNMING MACHINE TOOL Co.,Ltd. |