WO2020052117A1

WO2020052117A1 - Temperature monitoring device employing thermodynamic principles for computer numerical control lathe

Info

Publication number: WO2020052117A1
Application number: PCT/CN2018/119965
Authority: WO
Inventors: 陈羽笛; 陈建楼; 黄彬彬
Original assignee: 盐城巽为科技有限公司
Priority date: 2018-09-12
Filing date: 2018-12-09
Publication date: 2020-03-19
Also published as: CN108776458B; CN108776458A

Abstract

A temperature monitoring device (200) employing thermodynamic principles for a computer numerical control lathe (100). A temperature monitoring thermistor (211) is located at a portion experiencing the highest temperature rise in a stator of an electric spindle motor (111), wherein said highest temperature rise portion does not spatially interfere with the other components in the stator. Temperature protection thermistors (212) are connected in series, there being as many thermistors as there are phases of the electric spindle motor (111). Each temperature protection thermistor (212) is attached at a highest temperature rise portion of coil experiencing the highest temperature rise in a winding of each phase. A cutter temperature sensor (220) comprises three platinum-rhodium wire temperature sensor groups (221). A measurement head of each platinum-rhodium wire temperature sensor group (221) is disposed on an outer surface of a cutter tip (123), and is spaced apart from a machining portion of the cutter tip (123). A temperature regulation module (260) comprises a cold air regulation device (261) and a cold water regulation device (262). The temperature of a portion to be regulated is decreased via low-temperature cold air of the cold air regulation device (261) or low-temperature cold water of the cold water regulation device (262). The temperature monitoring device (200) of the numerical control lathe (100) accurately monitors the temperature of a key portion of the numerical control lathe (100) in a timely manner, and reduces the impact of temperature rise and thermal deformation reliably and effectively with low costs.

Description

NC lathe temperature monitoring device based on thermodynamic law

[0001] The present invention relates to the technical field of temperature monitoring of a numerically controlled lathe, and in particular, to a temperature monitoring and control device for a high-precision numerically controlled lathe.

Background technique

[0002] A numerically controlled lathe is a precision manufacturing equipment with high precision, high automation, and high flexibility. With the rapid development of CNC lathes and related manufacturing technologies, metal turning processing has set higher requirements for the accuracy and accuracy stability of CNC lathes. In precision turning, manufacturing errors caused by thermal deformation of CNC lathes account for 40% to 70% of the total error. In CNC lathes, the main factors affecting the thermal deformation of the lathe are the thermal deformation of the electric spindle and the thermal deformation of the tool. Electric spindles and tools are important parts of CNC lathes. The thermal deformation of electric spindles and tools is the most important influencing factor of thermal deformation of CNC lathes, and directly affects the machining accuracy of CNC lathes and the quality of the processed products. Therefore, in order to effectively control the thermal deformation of a CNC lathe, it is necessary to monitor the temperature of important parts such as the electric spindle and the tool, and then use various methods to eliminate the thermal deformation or the effect of thermal deformation. However, conventional temperature monitoring methods cannot find critical temperature information in time, which causes problems such as lag, instability, and low accuracy of temperature monitoring. Conventional thermal deformation control methods such as automatic thermal deformation compensation methods often have high costs, poor stability, and limited effects.

Summary of invention

technical problem

Problem solution

Technical solutions

[0003] The object of the present invention is to provide a temperature monitoring device for a numerically controlled lathe based on the laws of thermodynamics, which solves the aforementioned problems in the prior art. For this reason, the technical solution provided by the present invention is as follows.

[0004] In one embodiment, a temperature control device for a numerically controlled lathe based on the laws of thermodynamics is described, which includes a signal conditioning module, a data acquisition module, a data processing module and a temperature regulation module, and is provided on an electric spindle motor for An electric spindle temperature sensor for monitoring the temperature of the electric spindle motor and a tool temperature sensor provided on the tool tip for monitoring the temperature of the tool tip, the electric spindle temperature sensor and the tool temperature sensor The temperature information of the measured part is converted into an electrical signal and transmitted to the data acquisition module through the signal conditioning module. After the data acquisition module completes the analog-to-digital conversion, the temperature data is transmitted to the data processing module, and the data processing module is based on the received data. The temperature data makes a decision and sends a corresponding temperature control instruction to the temperature control module, the temperature control module performs temperature control on the corresponding to-be-regulated position according to the received temperature control instruction, and the electric spindle temperature sensor is located at the electric spindle motor. The interior of the stator does not interfere with other parts in the stator.

[0005] In one embodiment, the electric spindle temperature sensor includes a temperature monitoring thermistor and a temperature protection thermistor, and the temperature monitoring thermistor is located in the stator of the electric spindle motor and does not generate space with other components in the stator. The highest temperature rise of the interference, the temperature protection thermistor is connected in series with the same number of thermistors as the number of phases of the electric spindle motor, and each group of temperature protection thermistors is close to the highest temperature rise of the coil in each phase. Temperature rise parts.

[0006] The present invention can effectively solve the above problems. The related beneficial effects and other advantages will become clear from the following detailed description in conjunction with the accompanying drawings, which describe the beneficial effects of the principles and inventions of the present invention by way of example.

Brief description of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The described embodiments will be easily understood through the following description in conjunction with the accompanying drawings, wherein like reference numerals in the drawings denote similar structural elements, and the following are specific descriptions of the drawings.

[0008] FIG. 1 is a schematic diagram of the overall structure of a numerically controlled lathe temperature monitoring device according to a first embodiment of the present invention.

[0009] FIG. 2 is a schematic diagram of the overall structure of a numerically controlled lathe temperature monitoring device according to a first embodiment of the present invention in a plan view direction.

[0010] FIG. 3 is a partially enlarged view of the tool system in FIG. 2.

[0011] FIG. 4 is a schematic diagram of the internal structure of the electric spindle base according to the first embodiment of the present invention.

[0012] FIG. 5 is a position and arrangement diagram of a molybdenum rhodium wire temperature sensor group.

[0013] FIG. 6 is an overall architecture diagram of a temperature control device for a numerically controlled lathe according to Embodiment 1 of the present invention.

[0014] FIG. 7 is a schematic diagram of a temperature control module of a temperature control device for a numerically controlled lathe according to Embodiment 1 of the present invention.

8 is a KTY84 resistance temperature change curve of Embodiment 1 of the present invention.

[0016] FIG. 9 is a schematic diagram of an electric spindle temperature monitoring principle of a numerically controlled lathe temperature monitoring device according to Embodiment 1 of the present invention. [0017] FIG. 10 is a schematic diagram of an electric spindle temperature monitoring principle of a numerically controlled lathe temperature monitoring device according to Embodiment 4 of the present invention, the best embodiment for implementing the present invention

Best Mode of the Invention

[0018] A preferred embodiment of the present invention is as described in Example 1 below. It should be noted that all the embodiments of the present invention have their advantages and substantial progress, and the best specific embodiment given here is only a relative preferred solution based on an engineering requirement of the inventor. Does not have any limiting effect, does not exclude better and more specific specific embodiments within the protection scope of the present invention, and persons skilled in the art can select any other embodiment that is not directly described by the present invention but is within the protection scope of the present invention in combination with the present invention. Or a combination thereof should also be considered to be within the protection scope of the present invention.

Invention Examples

Embodiments of the invention

[0019] In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the basic principles of the described embodiments. However, it is obvious to a person skilled in the art that the described embodiments can be implemented without some or all of these specific details. During the description of the embodiments, known processing steps have not been described in detail to avoid unnecessarily obscuring the underlying principles.

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that the specific description given herein with reference to these drawings is for illustrative purposes, and that the present invention goes beyond these limited embodiments.

[0021] Embodiment 1.

[0022] As shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 4, a numerically controlled lathe 100 according to an embodiment of the present invention includes an electric spindle 110, a tool system 120, a PLC system 130, a multi-jaw chuck 140, and an electric spindle Base 150, electric control cabinet assembly 160, etc.

[0023] The electric spindle 110 includes an electric spindle motor 111 and an electric spindle driver 112.

[0024] The tool system 120 includes a tool holder 121, a tool holder 122, and a tool tip 123.

[0025] The electric spindle base 150 includes an electric spindle base body 151.

[0026] The electrical control cabinet assembly 160 includes hardware components of the main electrical control system of the CNC lathe 110, such as motor components, controllers, PLC system 130 and other related hardware components and related cables and converters. And other hardware components. The electric control cabinet assembly 160 further includes an electric control cabinet which is mainly used for accommodating, supporting, and protecting hardware components of the main electric control system of the CNC lathe 110.

[0027] With regard to the functions, connection relationships, working principles, working methods, and other specific implementation methods of the various components and main modules of the CNC lathe 100, there are many mature CNC lathe existing technologies that can be directly adopted and implemented by those skilled in the art, here The specific implementation of the prior art numerically controlled lathe 100 is not described in detail to avoid unnecessarily obscuring the fundamental principles of the present invention, but when the specific implementation of the numerically controlled lathe 100 according to the present invention is different from the prior art, it will be described in detail.

[0028] A numerically controlled lathe temperature monitoring device 200 according to an embodiment of the present invention includes an electric spindle temperature sensor 210, a tool temperature sensor 220, a signal conditioning module 230, a data acquisition module 240, a data processing module 250, and a temperature regulation module 260.

[0029] The electric spindle temperature sensor 210 is disposed on the electric spindle 110 for monitoring the real-time temperature of the electric spindle 110.

[0030] In one embodiment, the electric spindle temperature sensor 210 is disposed on the electric spindle motor 111 for monitoring the real-time temperature of the electric spindle motor 111.

[0031] The tool temperature sensor 220 is disposed on the tool system 120 for monitoring the real-time temperature of the tool system 120.

[0032] In one embodiment, the tool temperature sensor 220 is disposed on the tool tip 123 for monitoring the real-time temperature of the tool tip 123.

[0033] In an embodiment, the overall architecture diagram of the temperature monitoring device of the numerically controlled lathe is shown in FIG.

The electric spindle temperature sensor 210 and the tool temperature sensor 220 convert the temperature information of the measured part into an electrical signal and then transmit the signal to the data acquisition module 240 through the signal conditioning module 230. The data acquisition module 240 completes the analog-to-digital conversion and converts the temperature The data is transmitted to the data processing module 250. The data processing module 250 makes a decision based on the received temperature data and sends a corresponding temperature regulation instruction to the temperature regulation module 260. The temperature regulation module 260 responds to the received temperature regulation instruction. The corresponding parts to be controlled are temperature controlled.

[0034] Considering the convenience of installing and removing the temperature sensor, and avoiding the difficulty of replacing the sensor due to the damage of the temperature sensor, those skilled in the art usually set the electric spindle temperature sensor 210 on the outer surface of the electric spindle motor 111 or the electric spindle base. The portion 150 is close to the electric spindle motor 111. At this time, the temperature monitored by the electro-spindle temperature sensor 210 is not the actual temperature of the electro-spindle motor 111, and the monitored actual temperature curve and The actual temperature change curve of the electric spindle motor 111 is inconsistent, so that the real-time accurate temperature of the electric spindle motor 111 cannot be accurately monitored, and it is difficult to ensure the timeliness and accuracy of the temperature control.

[0035] In order to sense the accurate temperature of the core area of the electric spindle motor 111 in real time and improve the real-time accuracy of the temperature monitoring of the electric spindle motor 111 to ensure the timeliness and accuracy of temperature control, the electric spindle temperature sensor 210 is located in the electric spindle motor 111 Inside the stator.

[0036] In one embodiment, the electric spindle temperature sensor 210 is located inside the stator of the electric spindle motor 111 and does not interfere spatially with other components in the stator.

[0037] In one embodiment, the electric spindle temperature sensor 210 includes a temperature monitoring thermistor 211 and a temperature protection thermistor 212.

[0038] In one embodiment, the temperature monitoring thermistor 211 is located at the highest temperature rise part in the stator of the electric spindle motor 111 without spatial interference with other components in the stator, thereby preventing the temperature of the electric spindle motor m from being most accurate and timely. If it exceeds the standard, it will affect the performance, energy efficiency, stability, reliability and service life of the electric spindle motor.

[0039] In one embodiment, a constant current is experimentally passed for a period of time such as 3 minutes or 1 before the motor is packaged.

After 0 minutes, an infrared temperature measuring instrument can be used to directly measure and determine the highest temperature rise.

[0040] In one embodiment, the number of phases of the electro-spindle motor 111 is N-phase, and the temperature protection thermistor 212 has a total of N groups of thermistors connected in series, and each group of the temperature protection thermistors 212 is close to the middle temperature of each phase winding. The highest temperature rise part of the highest-rise coil, so as to prevent the temperature rise of a certain phase of the electric spindle motor 111 from exceeding the standard in the most accurate and timely manner, thereby affecting the performance, energy efficiency, stability, reliability and service life of the electric spindle motor 111, and even leading to The electric spindle motor 111 was burned.

[0041] When the temperature of a winding of a certain phase of the electric spindle motor 111 exceeds the reaction temperature of the temperature protection thermistor 212

The data processing module 250 makes a power-off decision of the electric spindle motor 111 according to the received temperature data and sends a corresponding temperature control instruction to the temperature control module 260. The temperature control module 260 responds to the corresponding temperature control instruction according to the received temperature control instruction. At the same time, the temperature of the to-be-regulated portion is adjusted, and at the same time, the PLC system 130 or the NC numerical control system automatically cuts off the current of the electric spindle motor 111 so that the electric spindle motor 111 is in a no-current state.

[0042] For example, as shown in FIG. 9 and FIG. 10, the number of phases of the electric spindle motor 111 is three-phase, and the temperature protection thermistor 21 2 has three groups of thermistors connected in series, and each group of the temperature protection thermistors 212 is closely attached. The highest temperature rise of the coil with the highest temperature rise of each phase winding. [0043] In one embodiment, a constant current is experimentally passed for a period of time, such as 3 minutes or 1 minute, before the motor is packaged.

After 0 minutes, an infrared temperature measuring instrument can be used to directly measure and determine the coil with the highest temperature rise in each phase and the highest temperature rise of the coil.

[0044] Considering the temperature change and distribution law of the electric spindle motor 111 and the temperature change range of the electric spindle motor 111. In one embodiment, the temperature monitoring thermistor 211 uses KTY84, and the temperature protection thermistor 212 uses PTC thermistor. .

[0045] As shown in FIG. 8, when the temperature monitoring thermistor 211 adopts KTY84, the resistance change of the KTY84 and the temperature change of the measured part have very good linear characteristics, and the temperature change of the electric spindle motor 111 can be monitored with higher accuracy.

[0046] In the actual implementation process, the warning temperature setting range of KTY84 can be selected from 120 ° C ± 5 ° C, 110 ° C ± 5 ° C, 100 ° C ± 5 ° C _^ 90 ° C ± 5 ° C, 80 ° C ± 5 ° C, 115 ° C ± 5 ° C, 105 ° C ± 5 ° C _^ 95 ° C ± 5 ° C, 85 ° C ± 5 ° C, 75 ° C ± 5 ° C, etc. Temperature range, spindle stall temperature range can be selected from 155 ° C ± 5 ° C, 145 ° C ± 5 ° C, 135 ° C ± 5 ° C, 125 ° C ± 5 ° C, 115 ° C ± 5 ° C, 110 ° C ± 5 ° C, 100 ° C ± 5 ° C, 90 ° C ± 5 ° C, 150 ° C ± 5 ° C, 140 ° C ± 5 ° C, 130 ° C ± 5 ° C, 120 ° C ± 5 ° C and any other stall temperature range. Among them, the temperature value of the spindle stop temperature range is higher than the temperature value of the warning temperature setting range.

[0047] When the temperature value of the measured part monitored by KTY84 is within the alarm temperature setting range, in one embodiment, the data processing module 250 issues an alarm to the PLC system 130 or the NC numerical control system and the PLC system 130 or the NC numerical control system Automatically record and save the time when the warning occurred and the actual temperature value.

[0048] When the temperature value of the measured part monitored by KTY84 is within the spindle stop temperature range, in one embodiment, the data processing module 250 directly issues a command to the electric spindle driver 112 via the PLC system 130 or the NC numerical control system. The electric spindle motor 111 stops rotating and is in a power-off state.

[0049] When the PTC thermistor is used as the temperature protection thermistor 212, a PTC thermistor having a corresponding reaction temperature is selected according to the actual required reaction temperature. For example, a cold state resistance (20 ° C) S7 50Q of a PTC thermistor, a thermal resistance (180 ° C) ^ 1710Q, a reaction temperature of 180 ° C, and its characteristic curve conforms to DINVDE 0660 part 303, DIN44081, DIN44082 . When the actual temperature of the measured part of the electric spindle motor 111 reaches the reaction temperature of the PTC thermistor, in one embodiment, the data processing module 250 directly issues a command to the electric spindle driver 112 via the PLC system 130 or the NC numerical control system. Motor spindle motor 111 stops rotating And in a power-off state.

[0050] Considering the convenience of installing and removing the temperature sensor, and avoiding the problem that the sensor is difficult to replace due to the damage of the temperature sensor, those skilled in the art generally set the tool temperature sensor 220 on the outer surface of the tool tip 123 but away from the processing point of the tool tip 123. . At this time, the temperature monitored by the tool temperature sensor 220 is not the actual temperature of the processing portion of the cutting edge 123, and the monitored actual temperature curve is not consistent with the actual temperature variation curve of the processing portion of the cutting edge 123, so that the processing of the cutting edge 123 processing portion cannot be accurately monitored. Accurate temperature in real time, it is difficult to ensure the timeliness and accuracy of temperature regulation.

[0051] In order to sense the accurate temperature of the core area of the processing area of the tool tip 123 in real time, and improve the real-time accuracy of the temperature monitoring of the tool tip 123 to ensure the timeliness and accuracy of temperature control, the tool temperature sensor 220 is located on the outer surface of the tool tip 123 At a distance of 1 mm or more and 20 mm or less from the machining portion of the tool tip 123.

[0052] In order to further improve the real-time and accuracy of the temperature monitoring of the core area of the tool tip 123 processing section, the interval between the tool temperature sensor 220 probe and the tool tip 123 processing section may be selected from 1 mm to 18 mm, and 1 mm to 17 mm. Within, 1mm or more, 16mm or less, 1mm or more and 15mm or less, 1mm or more and 12mm m or less, 1mm or more and 10mm or less, 1mm or more and 8mm, 1mm or more and 5mm or less, 1mm or more and 3mm or less, 1mm or more and 2mm or less, 2mm or more and 18mm or less, and 2mm or more Within 17mm, within 2mm and 16mm, within 2mm and 15mm, within 2mm and 12mm, within 2mm and 10mm, within 2mm and 8mm, within 2mm and 5mm, within 2mm and 3mm, within 3mm and within 18mm, and within 3mm and 17mm, 3mm to 16mm, 3mm to 15mm, 3mm to 12mm, 3mm to 10mm, 3mm to 8mm, 3mm to 5mm, 5mm to 18mm, 5mm to 17mm, 5mm to 16mm, 5mm to 15mm 5mm or more and 12mm or less, 5mm or more and 10mm or less, 5mm or more and 8mm or less, 5 m M above 6mm equally spaced.

[0053] In one embodiment, the cutter temperature sensor 220 includes a molybdenum rhodium wire temperature sensor group 221.

[0054] Considering the cutting edge 123, the processing part generally involves three processing surfaces, and the tool temperature sensor 220 includes three groups of molybdenum and rhodium wire temperature sensors 221. The measurement positions of the molybdenum rhodium wire temperature sensor group 221 of each group are shown in FIG. 5.

[0055] The temperature monitoring thermistor 211, the temperature protection thermistor 212, the signal conditioning module 230, the data acquisition module 240, and the data processing module 250 required by the molybdenum rhodium wire temperature sensor group 221 have many existing technologies such as Siemens 840D numerical control The system and corresponding machine tools, CN201010599119.7, etc. can be referenced. It can be implemented quickly with the existing technology, and will not be described in detail here.

[0056] It should be noted that the number of the temperature monitoring thermistor 211 included in the signal conditioning module 230 corresponds to the number of the temperature monitoring thermistor 211 and the characteristics of the temperature monitoring thermistor 211, including the temperature protection heat. The number of the thermistor 212 signal conditioning sub-modules corresponds to the number of the temperature protection thermistor 212 and the characteristics of the temperature protection thermistor 212, including the number of molybdenum rhodium wire temperature sensor group 221 and the number of molybdenum rhodium wire temperature sensor group 221 The number corresponds to the characteristics of the molybdenum-rhodium wire temperature sensor group 221.

[0057] It should be noted that the number of data collection sub-modules of the temperature monitoring thermistor 211 included in the data acquisition module 240 corresponds to the number of the temperature monitoring thermistor 211 and the characteristics of the temperature monitoring thermistor 211, including the temperature protection heat. The number of the data acquisition sub-modules of the thermistor 212 corresponds to the number of the temperature protection thermistors 212 and the characteristics of the temperature protection thermistors 212, including the number of molybdenum rhodium wire temperature sensor groups 221 and the number of molybdenum rhodium wire temperature sensor groups 221 The number corresponds to the characteristics of the molybdenum-rhodium wire temperature sensor group 221.

[0058] It should be noted that, in one embodiment, the temperature monitoring thermistor 21 included in the data processing module 250 includes the number of data processing sub-modules, the number of the temperature monitoring thermistor 211, and characteristics of the temperature monitoring thermistor 211. Correspondingly, the number of the data processing sub-modules of the temperature protection thermistor 212 included corresponds to the number of the temperature protection thermistor 212 and the characteristics of the temperature protection thermistor 212. The number of the molybdenum-rhodium wire temperature sensor group 221 corresponds to the characteristics of the molybdenum-rhodium wire temperature sensor group 221.

[0059] In the conventional technology, after obtaining the temperature data of each key part of the CNC lathe, the temperature control is generally performed by stopping and waiting for the high-temperature part to cool naturally. In this way, the cost is the lowest and almost no investment is required. However, this method needs to wait for a long time, which greatly increases the processing time and reduces the processing efficiency.

[0060] In order to reduce the effects of temperature rise and thermal deformation and ensure processing efficiency, 5 technologies such as CN201010599119.7 generally consider directly performing thermal deformation compensation, so as to minimize the effects of temperature rise and thermal deformation without affecting the processing efficiency. . However, such technologies often require higher costs, the system is too complex, and the stability and reliability of the system are often limited, and the actual results are not ideal.

[0061] In order to ensure processing efficiency and eliminate the effects of temperature rise and thermal deformation with high reliability, low cost and high efficiency, the temperature control module 260 of the present invention includes a cold air control device 261 or / and a cold water control device 262. [0062] The cold air regulating device 261 or / and the cold water regulating device 262 of the present invention can cool the temperature-regulated parts. The cooling mechanism is mainly based on the first law of thermodynamics, that is, the internal energy increase of the system is equal to the heat transferred from the outside and the outside. The sum of the work done to it, namely AU = Q + W, where AU is the amount of change in internal energy, Q is the energy transferred from the outside to the system, W is the work done by the outside to the system, and the second law of thermodynamics is heat It is possible to spontaneously transfer from a high-temperature object to a colder object, but it is impossible to spontaneously transfer from a low-temperature object to a high-temperature object. In other words, the cooling function of the air-conditioning control device 261 and the cold-water control device 262 is based on the second law of thermodynamics. First, the heat of the part to be controlled is transferred to the low-temperature medium, namely the low-temperature air-conditioning of the air-conditioning control device 261 or the low-temperature cold water of the cold-water control device 262 The heat transferred from the outside to the CNC lathe 100 is negative, thereby reducing the internal energy of the system, that is, the temperature, based on the first law of thermodynamics.

[0063] Based on the laws of thermodynamics, the cold air control device 261 or / and the cold water control device 262 of the present invention can ensure processing efficiency, and the system is simple, stable and reliable, and has low cost. It has the characteristics of easy implementation and good practical value. .

[0064] The cold air control device 261 may be a small air conditioner, or an air conditioner fan device with a cold air generator and a fan, or other cold air generating devices.

[0065] The cold air control device 261 is close to the electric spindle base 150 and injects air-cooled air into the electric spindle base 150 to cool down the electric spindle motor 111 so as to control the temperature of the electric spindle motor 111.

[0066] The electric spindle base 150 includes an electric spindle base body 151, a ventilation filter 152, and an air duct 153.

[0067] The electric spindle base body 151 is used for fixing and supporting the electric spindle motor 111 and the multi-jaw chuck 140.

[0068] The ventilation filter 152 is used to receive the cold air provided by the air-conditioning control device 261 and prevent external dust and other impurities from entering the electric spindle base 150 so as to prevent the electric spindle motor 111, the multi-jaw chuck 140, and related bearings. Affected by dust.

[0069] The air duct 153 is a gap formed between the inner cavity of the electro-spindle base body 151 and the electro-spindle motor 111, and an air flow passage between the inner cavity of the electro-spindle base body 151 and the multi-jaw chuck 140 hole cavity.

[0070] In one embodiment, as shown in FIG. 4, the cold air provided by the cold air control device 261 passes through the ventilation screen 15 2 and then acts on the outer surface of the electric spindle motor 111 through the air duct 153 to implement the electric spindle motor 111. At the same time, the cooling is provided, and the cold air provided by the cold air control device 261 passes through the multi-jaw chuck 140 through the air duct 153 and then flows out from the electric spindle base 150 to take away the heat of the electric spindle motor 111. In addition, the cold air flowing from the electric spindle base 150 can evenly affect the workpiece, the tool tip 123, and the tool system 120, so that the workpiece, the tool tip 123, and the tool can be uniformly applied. The system 120 lowers the temperature to a certain extent, and exerts a certain temperature regulation effect.

[0071] The cold water regulating device 262 includes a cooling water tank 262-1 and a cooling water spray head 262-2. The cooling water tank 26

2-1 has many existing technologies and mature products to choose from, especially many mature cooling water tanks. 262-1 products can set the output cooling water temperature as required.

[0072] In one embodiment, the cooling water spray head 262-2 is fixedly mounted on the tool system 120 and can move along the X axis along with the tool system 120, and the cooling water tank 262-1 is fixed to the CNC lathe 100 at a fixed position or It is fixedly connected to the ground or stationary on the ground. The cooling water tank 262-1 and the cooling water spray head 262-2 are connected by a cooling water pipe. Low-temperature cold water is pushed out from the cooling water tank 262-1 and reaches the cooling water spray head 262 through the cooling water pipe. -2, and sprayed from the cooling water nozzle 262-2.

[0073] The cooling water pipe and the molybdenum-rhodium wire temperature sensor group 221 signal line are all supported by the same drag chain and realize motion protection together with the X-axis power line and data line of the CNC lathe 100. The related existing technology can directly use.

[0074] In one embodiment, the cooling water spray head 262-2 directly faces the cutting edge 123 processing portion, and the low-temperature cold water acts on the cutting edge 123 processing portion through the cooling water spraying head 262-2 to realize the processing of the cutting edge 123. Department of cooling.

[0075] In one embodiment, the schematic diagram of the temperature control module of the temperature control device of the numerical control lathe is shown in FIG. 7. Under this principle, the data processing module 250 sends a temperature control instruction to the numerical control lathe PLC system 130, and the PLC system 130 according to the corresponding The instructions control the opening and closing of the cold air control device 261 and the cold water control device 262, respectively. The cold air control device 261 can control the temperature of the electric spindle motor 111 and appropriately cool the workpiece. The cold water control device 262 can control the temperature of the tool system 120. Regulate and accompany the proper cooling of the workpiece.

[0076] The proper cooling of the workpiece described herein means that a part of the cold air is left to the workpiece after passing through the electric spindle motor 111, or the low-temperature cold water flows to the workpiece through the tool system 120.

[0077] It should be noted that, in one embodiment, the data processing module 250 summarizes the temperature data obtained by the data acquisition module 240 in real time and obtains a real-time temperature one-dimensional array [xl, yl, _Za l, zbl, _ZC l], Then compare the values at the corresponding positions of the one-dimensional array [xl, y1, zal, zb1, zc1] with the preset alarm one-dimensional array [x2, y2, za2, zb2, zc2], the power-off one-dimensional array [\ 3, 3 _^ ^ 3 _^ ^ 3/03], one-dimensional array of electro-spindle control [x4, y4, za4, zb4, zc4], one-dimensional array of tool control [x5, y5, za5, zb5, _ZC 5] The value at the corresponding position. As long as the value of the corresponding position of the one-dimensional array [xl, yl, zal, zbl, zcl] of the real-time temperature is greater than or equal to the number of the corresponding position of the preset one-dimensional array Value, the temperature control module 260, the PLC system 130, or the NC numerical control system performs a corresponding operation. Among them, xl represents the actual temperature value measured by the temperature monitoring thermistor 211, yl represents the reaction temperature value measured by the temperature protection thermistor 212, and zal, zbl, zcl respectively indicate the temperature of each tool temperature sensor 220 such as molybdenum rhodium wire The actual temperature value measured by the sensor group 221, xi represents the temperature value set for the measuring point corresponding to the temperature monitoring thermistor 211, yi represents the reaction temperature value set for the measuring point corresponding to the temperature protection thermistor 212, zai, zbi , Zci respectively indicate the temperature values set for the respective measuring points of each tool temperature sensor 220, such as a molybdenum rhodium wire temperature sensor group 221, i = 2,3,4,5.

[0078] Specifically, when the \ 1 of the one-dimensional real-time temperature array [\ 1 ^ 1 1 1 ^ 1] is greater than or equal to x2 of the alarm one-dimensional array [x2, y2, za2, zb2, zc2], or the real-time temperature One-dimensional array [xl, yl, zal, zbl, zcl] Any value in zal, zbl, zc 1 is greater than or equal to the corresponding 2 & 1 1 ^ 1 in the alarm one-dimensional array [\ 2, 2 # 2 2 ^ 2] When the value is any of zal ^ za2 or zbl ^ zb2 or zcl ^ zc2, the data processing module 250 issues a warning through the PLC system 130 or NC numerical control system and automatically records and saves the time and actual temperature value when the warning occurs. At this time, y2 is set to 0.

[0079] When 1 of the real-time temperature one-dimensional array 1 ^ 1 1 1 ^ 1] is greater than or equal to y3 of the power-down one-dimensional array [\ 3 ^ 3 3, zb3, zc3], or the real-time temperature one-dimensional array [\ When \ 1 of 1, 1 / & 1/151 / (; 1] is greater than or equal to x3 of the one-dimensional array [x3, y3, za3, zb3, zc3] at power-off, the data processing module 250 passes the PLC system 130 or the NC numerical control system Power off the electric spindle motor 111. At this time, za3, zb3, and zc3 are all set to 0. In this mode, even if one of the temperature monitoring thermistor 211 and the temperature protection thermistor 212 does not work normally, or the data Error or data delay, the system can also perform power-off processing in time to avoid damage to the electric spindle motor 111 under special circumstances.

[0080] When the \ 1 of the real-time temperature one-dimensional array [\ 1, 1 1 1 ^ 1] is greater than or equal to x4 of the one-dimensional array [\ 4, y4, _z a4, zb4, zc4] of the electro-spindle, the electro-spindle The temperature control device 260 corresponding to the motor 111 starts to work, and the temperature control device 260 performs temperature control on the electric spindle motor 111. For example, the temperature of the electric spindle motor 111 is reduced by the cold air of the cold air control device 261 described above. Among them, X4 is larger than x2 and smaller than x3.

[0081] When any one of the values 2 & 1,2151 / 01 of the real-time temperature one-dimensional array [\ 1, 1 / & 1 / 151,201] is greater than or equal to the corresponding one of the one-dimensional array of tool adjustment [5, 5 # 5 5 ^ 5] When the value of 2 & 5 5 ^ 5, that is, any of zal za5 or zb hzb5 or ZC1 C5 occurs, the temperature control device 260 corresponding to the tool system 120 starts to work, and the temperature control device 260 performs temperature control on the tool tip 123, for example, by Cold water The cold water sprayed from the cooling water spray head 262-2 of the control device 262 cools the blade tip 123. Among them, za5, zb5, zc 5 are larger than za2, zb2, zc2, respectively.

[0082] As shown in FIG. 9, in one embodiment, the signal conditioning module 230, the data acquisition module 240, and the data processing module 250 are integrated into a total software and hardware module, thereby obtaining temperature data from the corresponding temperature sensors as a whole. The cold air control device 261, the cold water control device 262, and the electric spindle driver 112 are respectively controlled by the PLC system 130. At this time, the temperature signal of the temperature monitoring thermistor 211 is controlled by the software and hardware module integrated by the signal conditioning module 230, the data acquisition module 240, and the data processing module 250. The control instruction controls the air-conditioning through the PLC system 130 The control device 261, the cold water control device 262, and the electric spindle driver 112 control the air-conditioning control device 261, the cold water control device 262, and the electric spindle motor 111. The control code, line connection method, software and hardware structure in the specific implementation process, and many existing technologies such as Siemens 840D CNC system and corresponding machine tools, CN201010599119.7, CN201611146489.9, etc. can be directly adopted, and those skilled in the art combining the existing technology can quickly Implementation, will not be described in detail here

[0083] Embodiment 2.

[0084] Different from Embodiment 1, the temperature control device 260 of this embodiment includes two air-conditioning control devices 261, one air-conditioning control device 261 controls the temperature of the electric spindle motor 111, and one air-conditioning control device 261 controls the blade tip 123. Perform temperature regulation. The air-conditioning control device 261 for temperature-regulating the tool tip 123 includes an air nozzle facing the tool tip 123, and the air-conditioning control device 261 for temperature-controlling the electric spindle motor 111 includes an air filter 152 facing the air conditioner. Gas mouth. The low-temperature cold air can directly cool the part to be controlled through the air nozzle.

[0085] In order to save costs, the two cold air regulating devices 261 share one cold air generating device.

[0086] The cold air control device 261 for controlling the temperature of the tool tip 123 further includes an air pipe, and the signal line of the air pipe and the molybdenum-rhodium wire temperature sensor group 221 is common with the X-axis power line and data line of the CNC lathe 100 It is fixedly supported by the same towline and realizes motion protection, and the related existing technology can be directly adopted.

[0087] Embodiment 3.

[0088] Different from Embodiment 1, the temperature regulating device 260 of this embodiment includes two cold water regulating devices 262, one cold water regulating device 262 performs temperature regulation on the electric spindle motor 111, and one cold water regulating device 262 on the blade tip 123 Perform temperature regulation. [0089] The cold water regulating device 262 for controlling the temperature of the blade point 123 is the same as that of the first embodiment.

[0090] The cold water regulating device 262 for controlling the temperature of the electric spindle motor 111 includes a plurality of cooling water paths, and each of the cooling water paths is close to the stator winding of the electric spindle motor 111 having a high temperature rise and can control the electric spindle motor 11 1 Cool down. At this time, the electro-spindle base 150 does not need to be provided with the electro-spindle base body 151, the ventilation filter 152, the air duct 153, and the like, and only needs to provide the through holes or grooves required for the cooling water passage. The external cooling pipeline installation and fixing structure of industrial equipment is not described in detail here.

[0091] In order to save costs, the two cold water regulating devices 262 share one cooling water tank 262-1.

[0092] Embodiment 4.

[0093] What is different from Embodiment 1 is that as shown in FIG. 10, the signal conditioning module 230, the data acquisition module 240, and the data processing module 250 of this embodiment are integrated into a total software and hardware module, so that the overall temperature and temperature The protection thermistor 212 and / or the tool temperature sensor 220, such as a molybdenum rhodium wire temperature sensor group 221, obtain temperature data, and then integrate it into the PLC system 130 to form a whole, and then the PLC system 130 controls the cold air control device 261 and the cold water control device. 262. At this time, the temperature signal of the temperature protection thermistor 212 and / or the tool temperature sensor 220, such as the molybdenum rhodium wire temperature sensor group 221, is integrated through the signal conditioning module 230, the data acquisition module 240, and the data processing module 250. The module obtains a control instruction, which controls the air-conditioning control device 261 and the cold-water control device 262 through the PLC system 130, and then controls the air-conditioning control device 261 and the cold water control device 262; and the temperature signal of the temperature monitoring thermistor 211 is directly sent to electricity The spindle driver 112 obtains the control instruction and the real-time temperature data of the electric spindle motor 111 through the signal conditioning module, the acquisition module and the data processing module inside the electric spindle driver 112. The control instruction directly controls the electric spindle motor 111 through the electric spindle driver 112, At this time, the PLC system 130 obtains real-time temperature data of the electric spindle motor 111 directly from the electric spindle driver 112 and sends control instructions to control the cold air control device 261 and the cold water control device 262 based on these real-time temperature data. The specific implementation of the temperature monitoring thermistor 211 via the electro-spindle driver 112 and the electro-spindle driver 112 to directly control the electro-spindle motor 111 can be implemented with reference to the Siemens 840D series CNC lathes, and is not described in detail here.

[0094] The foregoing solutions have been described and described in connection with specific embodiments. It should be understood that the foregoing embodiments are used to illustrate the present invention and not to limit the scope of the present invention. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer. The implementation conditions that are not specified are generally the conditions in conventional experiments.

[0095] The above examples are only to illustrate the technical concept and features of the present invention, and the purpose is to let people familiar with the technology Being able to understand and implement the content of the present invention does not limit the scope of protection of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention shall be covered by the protection scope of the present invention.

[0096] The embodiments described above describe the technical solution of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention, and are not intended to limit the present invention. Anything within the scope of the principles of the present invention Any modification, supplement, or substitution in a similar manner shall be included in the protection scope of the present invention.

Claims

Claim

[Claim 1] A temperature control device for a numerically controlled lathe based on the laws of thermodynamics, comprising a signal conditioning module, a data acquisition module, a data processing module, and a temperature regulation module, and the motor is used to monitor the temperature of the motor of the electric spindle. The electric spindle temperature sensor and the tool temperature sensor provided on the tool tip for monitoring the temperature of the tool tip, the electric spindle temperature sensor and the tool temperature sensor convert the temperature information of the measured part into an electric signal and transmit the signal to the signal conditioning module. A data acquisition module, after the data acquisition module completes analog-to-digital conversion, transmits the temperature data to the data processing module, the data processing module makes a decision based on the received temperature data and sends a corresponding temperature control instruction to the temperature control module, so that The temperature regulation module performs temperature regulation on the corresponding to-be-regulated position according to the received temperature regulation instruction, and the electric spindle temperature sensor is located inside the stator of the electric spindle motor and does not interfere with other components in the stator in space.

[Claim 2] The numerically controlled lathe temperature monitoring device according to claim i, wherein the electric spindle temperature sensor comprises a temperature monitoring thermistor and a temperature protection thermistor, and the temperature monitoring thermistor is located in the electrical The temperature rise highest part in the spindle motor stator that does not interfere with other parts in the stator. The temperature protection thermistor is connected in series by the same number of thermistors as the number of phases of the electric spindle motor. Each group of temperature protection thermistor stickers Tighter than the highest temperature rise of the coil with the highest temperature rise in each phase winding.

[Claim 3] The numerically controlled lathe temperature monitoring device according to claim 2, characterized in that: the highest temperature rise part in the stator of the electric spindle motor that does not interfere with other parts in the stator, and in each phase winding The highest temperature rise part of the coil with the highest temperature rise can be directly measured and determined by using an infrared temperature measuring instrument after passing a constant current for a period of time before the motor is packaged.

[Claim 4] The numerically controlled lathe temperature monitoring device according to claim 2, wherein the temperature monitoring thermistor is KTY84, and the temperature protection thermistor is PTC thermistor.

[Claim 5] The numerically controlled lathe temperature monitoring device according to claim 4, wherein the KT

Y84's warning temperature setting range can be selected from 120 ° C ± 5 ° C, 110 ° C ± 5 ° C, 100 ° C ± 5 ⁰ C, 90 ° C ± 5 ° C, 80 ° C ± 5 ° C, 115 ° C ± 5 ° C, 105 ° C ± 5 ° C _^ 95 ° C ± 5 ° C, 85 ° C ± 5 ° C, 75 ° C ± 5 ° C Any warning temperature range, the spindle stall temperature range can be selected from 155 ° C ± 5 ° C, 145 ° C ± 5 ° C, 135 ° C ± 5 ° C, 125 ° C

± 5 ° C, 115 ⁰ C ± 5 ⁰ C, 110 ^o C ± 5 ^o C, 100 ^o C ± 5 ^o C, 90 ^o C ± 5 ^o C, 150 ° C ± 5 ° C, 140 ° C ± 5 ° C, 130 ° C ± 5 ° C, 120 ° C ± 5 ° C, and the temperature value of the spindle stall temperature range is higher than the temperature value of the warning temperature setting range; when KTY84 monitors When the temperature value of the measured part is within the alarm temperature setting range, the data processing module issues an alarm to the PLC system or NC numerical control system, and the PLC system or NC numerical control system automatically records and saves the time and actual temperature value when the alarm occurs; when KTY84 monitors When the measured temperature value of the measured part is within the spindle stop temperature range, the data processing module sends a command to the electric spindle driver via the PLC system or NC control system to directly stop the electric spindle motor from turning off and in a power-off state.

[Claim 6] The numerically controlled lathe temperature monitoring device according to claim 1, wherein the tool temperature sensor includes three sets of molybdenum-rhodium wire temperature sensor groups, and the probes of each molybdenum-rhodium wire temperature sensor group are arranged at the tool tip The outer surface is kept at a distance of 1 mm or more and 20 mm or less from the machining portion of the cutting edge.

[Claim 7] The numerically controlled lathe temperature monitoring device according to claim 1, wherein the temperature control module includes a cold air control device and a cold water control device, and the cold air control device and the cold water control device pass through the cold air control device. The low-temperature cold air or the cold water of the cold water regulating device reduces the temperature of the part to be regulated.

[Claim 8] The numerically controlled lathe temperature monitoring device according to claim 7, characterized in that the cold air provided by the air conditioning control device acts on the outer surface of the electric spindle motor through the air filter through the ventilation filter, thereby realizing the electric spindle. The motor cools down; the cold air provided by the air conditioning control device passes through the multi-jaw chuck through the air duct and then flows out of the electric spindle base to take away the heat of the electric spindle motor; the cold air flowing from the electric spindle base can act on the workpiece and Tooling system.

[Claim 9] The numerically controlled lathe temperature monitoring device according to claim 7, characterized in that the cold water regulating device comprises a cooling water tank and a cooling water spray head, and the cooling water spray head is fixedly installed in the tool system and can follow the tool system. Moving along the X axis, the cooling water nozzle is facing the tool tip The low-temperature cold water acts on the cutting edge processing part through a cooling water nozzle, the cooling water tank and the cooling water nozzle are connected by a cooling water pipe, and the cooling water pipe and the X-axis power line and the data line of the CNC lathe are jointly The same towline is fixed to support and achieve movement protection.

[Claim 10] The numerically controlled lathe temperature monitoring device according to claim 1, characterized in that, when the actual temperature value measured by the electric spindle temperature sensor is greater than or equal to the corresponding temperature value set for the measuring point of the electric spindle temperature sensor, The temperature control device controls the temperature of the electric spindle motor. When the actual temperature value measured by the tool temperature sensor is greater than or equal to the corresponding temperature value set for the measurement point of the tool temperature sensor, the temperature control device controls the temperature of the tool tip.