CN112720018A - Numerical control machine tool and machining method thereof - Google Patents

Abstract

The technical scheme of the invention is realized as follows: a kind of numerical control machine tool, characterized by: the automatic adjusting device comprises a lathe bed, a main shaft box, an upper main shaft and a lower main shaft, wherein the main shaft box, the upper main shaft and the lower main shaft are arranged on the lathe bed, the upper main shaft and the lower main shaft are identical in structure and are symmetrically arranged, the upper main shaft and the lower main shaft are in transmission connection through a first belt, a driving mechanism is arranged on the lathe bed, the driving mechanism comprises a driving motor, a driving wheel which is connected to the output end of the driving motor and is controlled by the driving motor to rotate, a driven wheel which is rotatably arranged on the lathe bed through a rotating shaft, and a second belt which is wound on the driving wheel, the driven wheel and the lower; the invention has the beneficial effects that: the automatic cooling device has the advantages of high working efficiency, stable transmission, capability of automatically adjusting the tension of the transmission belt, controllable cooling, good cooling effect, controllable working temperature and stable work.

Description

Numerical control machine tool and machining method thereof

Technical Field

The invention relates to the technical field of machine tools, in particular to a numerical control machine tool and a machining method thereof.

Background

Machine tools are machines for manufacturing machines, also called machine tools or machine tools, and are conventionally called machine tools for short; generally divided into metal cutting machines, forging machines, woodworking machines, etc.; the methods for machining machine parts in modern machine manufacturing are numerous: except for cutting processing, the method also comprises casting, forging, welding, stamping, extruding and the like, but all parts with higher precision requirements and thinner surface roughness requirements generally need to be finally processed by a cutting method on a machine tool, and the machine tool plays an important role in the construction of national economy and modernization; the numerical control machine tool is a digital control machine tool for short, and is an automatic machine tool provided with a program control system; the control system can logically process a program provided with control codes or other symbolic instructions, decode the program, represent the decoded program by coded numbers and input the coded number into the numerical control device through an information carrier; after operation processing, the numerical control device sends out various control signals to control the action of the machine tool, and parts are automatically machined according to the shape and the size required by the drawing; the existing machine tool has low production efficiency and is difficult to meet the requirement of machining efficiency, and the existing numerical control machine tool adopting double main shafts is used for machining, but the tension is inconvenient to adjust, and the tension of a transmission belt cannot be automatically adjusted; meanwhile, when the existing machine tool is used for processing a specific workpiece, temperature control needs to be carried out in order to avoid influencing the property of the workpiece, the existing temperature control device has poor temperature control effect, cannot meet the requirements of temperature cooling speed and temperature precision, and influences the working efficiency of the machine tool.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a numerical control machine tool and a machining method thereof, which are used for solving the problems in the background art.

The technical scheme of the invention is realized as follows: a kind of numerical control machine tool, characterized by: the automatic adjusting device comprises a lathe bed, a spindle box, an upper spindle and a lower spindle, wherein the spindle box, the upper spindle and the lower spindle are arranged on the lathe bed, the upper spindle and the lower spindle are identical in structure and are symmetrically arranged, the upper spindle and the lower spindle are in transmission connection through a first belt, a driving mechanism is installed on the lathe bed, the driving mechanism comprises a driving motor, a driving wheel which is connected to the output end of the driving motor and is controlled to rotate by the driving motor, a driven wheel which is installed on the lathe bed in a rotating mode through a rotating shaft, a second belt which is arranged on the driving wheel, the driven wheel and the second belt which is arranged on the lower spindle.

Preferably: adjustment mechanism includes take-up pulley, slider, carriage, push rod and locating part, the second belt is around establishing on the take-up pulley, the carriage sets up on the lathe bed, and this carriage is provided with the down tube towards the one end of take-up pulley, the push rod includes the body of rod and is fixed in the body of rod and keeps away from the connecting portion of carriage one end, the slider activity set up on the down tube and with body of rod fixed connection, the take-up pulley sets up on the lathe bed through the pivot, connecting portion pass through the locating part activity and set up in the pivot, the locating part includes spacing portion and locates the sliding part of spacing portion one side, run through on spacing portion and the sliding part and be provided with the mounting hole that supplies pivot one end to penetrate, locating part.

Preferably: the connecting portion of the push rod is vertically provided with a sliding groove, the sliding groove is perpendicular to the rod body, the sliding portion is inserted into the sliding groove, the diameter of the limiting portion is larger than the width of the sliding groove, and the connecting portion is movably connected with the rotating shaft.

Preferably: the lathe bed is provided with a horizontal groove, one end of the rotating shaft penetrating into the mounting hole is arranged in the horizontal groove in a penetrating mode, and when the sliding block slides downwards along the sliding frame, the push rod drives the rotating shaft to move in the horizontal groove.

Preferably: the lathe bed is provided with the scale in horizontal groove lower extreme, spacing portion outside is equipped with the marking.

Preferably: the automatic cooling device comprises a water tank, a water pipe, an atomizer, an air inlet pipe and an injection pipe, wherein the water tank and the injection pipe are fixed on the mounting frame, cooling water is stored in the water tank, the water tank is communicated with the air inlet pipe through the water pipe, one end of the air inlet pipe is connected with the other end of cold air and communicated with the injection pipe, a spray head is arranged on one side, facing the upper main shaft and the lower main shaft, of the injection pipe, and the atomizer is arranged in the water pipe.

Preferably: the air inlet pipe is provided with an electromagnetic valve, and further comprises a temperature controller, a pulse controller and a valve controller which are sequentially connected, the output end of the valve controller is connected with the control end of the electromagnetic valve, the upper main shaft and the lower main shaft are respectively provided with a temperature sensor for collecting temperature signals and a temperature transmitter which is arranged on the temperature sensor and used for outputting the temperature signals to the temperature controller, and the temperature transmitter is connected with the temperature controller.

Preferably: the temperature controller is an IP controller, and can calculate the ventilation frequency and the opening and closing time of the air inlet pipe according to the temperature deviation between the preset working temperature value and the measured actual working temperature and transmit the ventilation frequency and the opening and closing time to the pulse controller; the pulse controller is used for receiving a control signal of the temperature controller, converting the control signal into a pulse control timing signal and transmitting the timing signal to the valve controller; and the valve controller is used for receiving the time sequence signal of the pulse controller to form an air electromagnetic valve control signal and controlling the electromagnetic valve to be opened or closed according to the calculated frequency and duration.

Preferably: the mixer is characterized in that a mixer is further arranged on the air inlet pipe, the mixer is a spherical body with an inner cavity, a storage tank filled with cooling liquid is arranged in the mixer, a spiral pipe is arranged between the inner wall of the mixer and the storage tank, one connecting end of the air inlet pipe and the mixer is inserted into the input end of the spiral pipe in the mixer to be communicated and is in contact with the outer wall of the storage tank, and the other connecting end of the air inlet pipe and the mixer is connected with the output end of the spiral pipe.

A machining method of a numerical control machine tool is characterized by comprising the following steps:

s1: the motor drives the driving wheel to rotate, the lower main shaft is driven to rotate through the second belt, the lower main shaft drives the upper main shaft to rotate through the first belt, and the upper main shaft and the lower main shaft synchronously drive to work to process a workpiece;

s2: the sliding block slides downwards on the inclined rod by means of self gravity, the tensioning wheel is driven by the sliding block and the push rod to move rightwards in the horizontal groove by means of the gravity of the sliding block until the sliding block stops moving due to stress balance, the tensioning wheel tensions a second belt, and the tensioning force of the second belt is kept stable all the time under the condition of stress balance;

s3: the temperature of the upper main shaft and the lower main shaft is increased along with the increase of the working time, the temperature sensor detects temperature signals near a processing position and transmits the temperature signals to the temperature controller, and the temperature controller controls the valve controller through the pulse controller according to the temperature deviation between the preset working temperature value and the detected actual working temperature so as to control the opening and closing frequency of the electromagnetic valve, namely control the frequency of the introduced cooling air and automatically cool the upper main shaft and the lower main shaft;

s4: under the conditions of automatically adjusting the tension and automatically adjusting the temperature during machining, the machine tool stably works.

The invention has the beneficial effects that: according to the invention, the processing efficiency is improved by arranging the two main shafts, the tension of the second belt driven by the driving motor to rotate by the main shafts is automatically adjusted by arranging the adjusting mechanism, the tension is not required to be manually adjusted, the labor is saved, and the use is convenient and rapid; the automatic cooling device is arranged, and cooling gas and atomized cooling liquid are adopted for spray cooling, so that the cooling effect is good, the contact surface is wide, and the water resource utilization is low; the opening and closing time and the frequency of the electromagnetic valve are accurately controlled simultaneously, so that the cooling rate and the cooling efficiency are controlled, the purpose of accurately controlling the processing temperature is achieved, the stability of work is guaranteed, the service life of the spindle is prolonged, and meanwhile, the cooling rate is accurately controlled, and the cooling stability is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of an adjustment mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a position-limiting element according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an automatic cooling device according to an embodiment of the present invention;

FIG. 5 is a schematic view of the installation of a temperature sensor in an embodiment of the present invention;

FIG. 6 is a schematic diagram of a mixer according to an embodiment of the present invention;

the examples in the figure are: 1. the automatic control device comprises a lathe bed, 2, a main spindle box, 3, an upper main spindle, 4, a lower main spindle, 5, a first belt, 6, a driving motor, 7, a driving wheel, 8, a driven wheel, 9, a second belt, 10, a tension wheel, 101, a rotating shaft, 11, a sliding block, 12, a sliding frame, 121, a diagonal rod, 13, a push rod, 131, a rod body, 132, a connecting part, 1321, a sliding groove, 14, a limiting part, 141, a limiting part, 142, a sliding part, 143, a mounting hole, 15, a horizontal groove, 16, a scale, 17, a marked line, 18, a mounting frame, 19, a water tank, 20, a water conveying pipe, 21, an atomizer, 22, an air inlet pipe, 23, an injection pipe, 24, a spray head, 25, an electromagnetic valve, 26, a temperature controller, 27, a pulse controller, 28, a valve controller, 29, a temperature sensor, 30, a temperature transmitter, 31, a mixer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 to 3, the present invention discloses a numerical control machine tool, which in an embodiment of the present invention comprises a machine body 1, a main spindle box 2, an upper spindle 3 and a lower spindle 4, which are arranged on the machine body 1, wherein the upper spindle 3 and the lower spindle 4 are identical in structure and symmetrically arranged, the upper spindle 3 and the lower spindle 4 are in transmission connection through a first belt 5, the first belt is a toothed belt to ensure the stability of the connection between the upper spindle and the lower spindle, a driving mechanism is arranged on the machine body 1, the driving mechanism comprises a driving motor 6, a driving wheel 7 connected to the output end of the driving motor 6 and controlled by the driving motor 6 to rotate, a driven wheel 8 rotatably arranged on the machine body 1 through a rotating shaft 101, and a second belt 9 wound around the driving wheel 7, the driven wheel 8 and the lower spindle 4, the driving motor drives the lower spindle to operate through the second belt, the rotation of the lower main shaft drives the upper main shaft to synchronously rotate through a first belt; the lathe bed 1 is also provided with an adjusting mechanism for automatically adjusting the tension of the second belt 9.

In the present embodiment, the adjusting mechanism includes a tension wheel 10, a slide block 11, a sliding frame 12, a push rod 13 and a limiting member 14, the second belt 9 is wound on a tension wheel 10, the sliding frame 12 is arranged on the bed body 1, the end of the sliding frame 12 facing the tensioning wheel 10 is provided with an inclined rod 121, the push rod 13 comprises a rod body 131 and a connecting part 132 fixed at one end of the rod body 131 far away from the sliding frame 12, the slide block 11 is movably arranged on the inclined rod 121 and is fixedly connected with the rod body 131, the tension pulley 10 is arranged on the machine body 1 through the rotating shaft 101, the connecting portion 132 is movably disposed on the rotating shaft 101 through a limiting member 14, the limiting member 14 includes a limiting portion 141 and a sliding portion 142 disposed on one side of the limiting portion 141, the limiting part 141 and the sliding part 142 are provided with an installation hole 143 for one end of the rotating shaft 101 to penetrate through, and the limiting part 14 is fixedly connected with the rotating shaft 101; a sliding groove 1321 is vertically formed in the connecting portion 132 of the push rod 13, the sliding groove 1321 is perpendicular to the rod body 131, the sliding portion 142 is inserted into the sliding groove 1321, the diameter of the limiting portion 141 is larger than the width of the sliding groove 1321, and the connecting portion 132 is movably connected with the rotating shaft 101; a horizontal groove 15 is formed in the lathe bed 1, one end of the rotating shaft 101 penetrating through the mounting hole 143 penetrates through the horizontal groove 15, and when the sliding block 11 slides downwards along the sliding frame 12, the push rod 13 drives the rotating shaft 101 to move in the horizontal groove 15; the lathe bed 1 is provided with scales 16 at the lower end of the horizontal groove 15, the scales are arranged in parallel with the horizontal groove, and the outside of the limiting part 141 is provided with a marking 17; through observing the scale position that the marking aimed at, just can know the tensioning condition of second belt and then calculate the tensioning force, be convenient for understand the rate of tension of second belt directly perceivedly.

In this embodiment, the slider is movably disposed on the inclined rod, and is fixed on the rod body by locking screws, welding, and the like, the mass and weight of the slider are much greater than those of the push rod, the sliding portion penetrates through the sliding groove, and the limiting portion is blocked at two side edges of the sliding groove; one end of the rotating shaft penetrating through the horizontal groove is locked into the mounting hole so as to fix the fixing piece on the rotating shaft, the connecting part is movably arranged on the rotating shaft, the inclined rod supports the sliding block to enable the push rod to be in a horizontal state, and the sliding groove is in a vertical state; in this embodiment, the motion trajectory of the push rod is the same as the motion trajectory of the slider, and the rotating shaft moves in the horizontal groove.

The working principle of the adjusting mechanism is as follows: the sliding block slides downwards along the inclined rod under the action of gravity, and when the sliding block slides downwards along the inclined rod, the push rod moves downwards and pushes the rotating shaft to move in the horizontal groove; the tensioning wheel moves along with the movement of the rotating shaft, so that the second belt is driven to move to tension the second belt, and the tensioning force of the second belt is further adjusted, the tighter the second belt is pulled, the greater the tensioning force is, and the greater the thrust of the second belt to the sliding block through the tensioning wheel and the push rod is; when the thrust of a second belt to the sliding block is increased to balance the force on the sliding block, the sliding block is still on the inclined rod; when the second belt is loosened, the tension force of the second belt is reduced, otherwise, the thrust force exerted on the sliding block is reduced, the sliding block is unbalanced in stress and slides downwards on the inclined rod, the push rod pushes the rotating shaft rightwards, the tensioning wheel moves along with the rotating shaft, so that the second belt is tensioned again to increase the tension force, the thrust force exerted on the sliding block is increased after the tension force is increased, and the sliding block is balanced in stress and stops on the inclined rod again; therefore, when the second belt is loosened, the tension of the second belt can be increased through the self-movement of the sliding block, and the purpose of automatically adjusting the tension is achieved.

Through the technical scheme, through the setting of two main shafts, machining efficiency is improved, through adjustment mechanism's setting, the tensile force of main shaft pivoted second belt is adjusted under driving motor drives automatically, need not artifically adjust the tensile force, saves artifically, and convenient to use is swift.

Example 2

As shown in fig. 4 to 6, the present embodiment is different from the above-described embodiments in that: in this embodiment, be provided with mounting bracket 18 on lathe bed 1, be provided with automatic heat sink on the mounting bracket 18, automatic heat sink includes water tank 19, raceway 20, atomizer 21, air-supply line 22 and injection pipe 23, water tank 19 and injection pipe 23 are all fixed on mounting bracket 18, the coolant liquid has been stored in the water tank, water tank 19 passes through raceway 20 and air-supply line 22 intercommunication, the cold air other end and injection pipe 23 intercommunication are connected to the one end of air-supply line 22, shower nozzle 24 is installed to one side of injection pipe 23 towards last main shaft 3 and lower main shaft 4, atomizer 21 is installed in raceway 20, and the atomizer carries the atomizing of coolant liquid, still is provided with the pump body that drives the interior gas transport of air-supply line in this embodiment on the air-supply line.

In this embodiment, the air inlet pipe 22 is provided with an electromagnetic valve 25, and further comprises a temperature controller 26, a pulse controller 27 and a valve controller 28 which are connected in sequence, an output end of the valve controller 28 is connected with a control end of the electromagnetic valve 25, the upper spindle 3 and the lower spindle 4 are both provided with a temperature sensor 29 for acquiring a temperature signal and a temperature transmitter 30 arranged on the temperature sensor 29 for outputting the temperature signal to the temperature controller 26, and the temperature transmitter 30 is connected with the temperature controller 26; the temperature controller 26 is an IP controller, which can calculate the ventilation frequency and the on-off time of the air inlet pipe 22 according to the temperature deviation between the preset working temperature value and the measured actual working temperature and transmit the ventilation frequency and the on-off time to the pulse controller 27; the pulse controller 27 is configured to receive the control signal from the temperature controller 26, convert the control signal into a pulse control timing signal, and then transmit the timing signal to the valve controller 28; the valve controller 28 is used for receiving the time sequence signal of the pulse controller 27 to form a control signal of the air electromagnetic valve 25, and controlling the electromagnetic valve 25 to be opened or closed according to the calculated frequency and duration; in other embodiments, the automatic cooling device may correspond to only one spindle, that is, two sets of automatic cooling devices are used to respectively cool the upper spindle and the lower spindle.

In this embodiment, the air inlet pipe 22 is further provided with a mixer 31, the mixer 31 is a spheroid with an inner cavity, a storage tank 32 filled with cooling liquid is arranged in the mixer 31, a spiral pipe 33 is arranged between the inner wall of the mixer 31 and the storage tank 32, one end of the air inlet pipe 22 connected with the mixer 31 is inserted into the input end of the spiral pipe 33 in the mixer 31 to be communicated with the outer wall of the storage tank 32, and the other end of the air inlet pipe 22 connected with the mixer 31 is connected with the output end of the spiral pipe 33; through the setting of blender, with cooling gas and the coolant liquid intensive mixing after the atomizing, improve the cooling effect.

The working principle of the automatic cooling device is as follows: when the machine tool works, the upper main shaft and the lower main shaft work at high strength to generate high temperature, the pump body drives cold gas and atomized cooling liquid to be conveyed in the air inlet pipe, cooling liquid mist mixed with cold air enters the injection pipe and is injected onto the upper main shaft and the lower main shaft from the spray head to be cooled, and the air supply frequency and time are controlled through opening and closing of the electromagnetic valve to control the cooling rate and effect, so that the working temperature is controlled; wherein, temperature sensor detects the temperature of last main shaft and lower main shaft and carries temperature controller through temperature transmitter, the last preset operating temperature value (the temperature of department of working under the ideal state) that is set for of temperature controller, temperature controller calculates the ventilation frequency and the opening and closing time of air-supply line and transmits for pulse controller according to the temperature deviation between preset operating temperature value and the actual operating temperature who surveys, form the chronogenesis model through pulse controller and transmit to valve controller, by opening and closing time and the frequency of valve controller control solenoid valve, for example: when the measured temperature is higher, the opening time of the electromagnetic valve is prolonged, and the cooling efficiency is improved.

By adopting the technical scheme, the cooling gas and the atomized cooling liquid are adopted for spray cooling through the arrangement of the automatic cooling device, the cooling effect is good, the contact surface is wide, and the water resource utilization is less; the opening and closing time and the frequency of the electromagnetic valve are accurately controlled simultaneously, so that the cooling rate and the cooling efficiency are controlled, the purpose of accurately controlling the processing temperature is achieved, the stability of work is guaranteed, the service life of the spindle is prolonged, and meanwhile, the cooling rate is accurately controlled, and the cooling stability is guaranteed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A kind of numerical control machine tool, characterized by: the automatic adjusting device comprises a lathe bed, a spindle box, an upper spindle and a lower spindle, wherein the spindle box, the upper spindle and the lower spindle are arranged on the lathe bed, the upper spindle and the lower spindle are identical in structure and are symmetrically arranged, the upper spindle and the lower spindle are in transmission connection through a first belt, a driving mechanism is installed on the lathe bed, the driving mechanism comprises a driving motor, a driving wheel which is connected to the output end of the driving motor and is controlled to rotate by the driving motor, a driven wheel which is installed on the lathe bed in a rotating mode through a rotating shaft, a second belt which is arranged on the driving wheel, the driven wheel and the second belt which is arranged on the lower spindle.

2. The numerical control machine tool according to claim 1, characterized in that: adjustment mechanism includes take-up pulley, slider, carriage, push rod and locating part, the second belt is around establishing on the take-up pulley, the carriage sets up on the lathe bed, and this carriage is provided with the down tube towards the one end of take-up pulley, the push rod includes the body of rod and is fixed in the body of rod and keeps away from the connecting portion of carriage one end, the slider activity set up on the down tube and with body of rod fixed connection, the take-up pulley sets up on the lathe bed through the pivot, connecting portion pass through the locating part activity and set up in the pivot, the locating part includes spacing portion and locates the sliding part of spacing portion one side, run through on spacing portion and the sliding part and be provided with the mounting hole that supplies pivot one end to penetrate, locating part.

3. A numerically controlled machine tool according to claim 2, wherein: the connecting portion of the push rod is vertically provided with a sliding groove, the sliding groove is perpendicular to the rod body, the sliding portion is inserted into the sliding groove, the diameter of the limiting portion is larger than the width of the sliding groove, and the connecting portion is movably connected with the rotating shaft.

4. A numerically controlled machine tool according to claim 3, wherein: the lathe bed is provided with a horizontal groove, one end of the rotating shaft penetrating into the mounting hole is arranged in the horizontal groove in a penetrating mode, and when the sliding block slides downwards along the sliding frame, the push rod drives the rotating shaft to move in the horizontal groove.

5. The numerical control machine tool according to claim 4, characterized in that: the lathe bed is provided with the scale in horizontal groove lower extreme, spacing portion outside is equipped with the marking.

6. The numerical control machine tool according to any one of claims 1 to 5, characterized in that: the automatic cooling device comprises a water tank, a water pipe, an atomizer, an air inlet pipe and an injection pipe, wherein the water tank and the injection pipe are fixed on the mounting frame, the water tank is communicated with the air inlet pipe through the water pipe, one end of the air inlet pipe is connected with the other end of cold air and communicated with the injection pipe, the injection pipe is provided with a spray head towards one side of an upper main shaft and one side of a lower main shaft, and the atomizer is installed in the water pipe.

7. The numerical control machine tool according to claim 6, characterized in that: the air inlet pipe is provided with an electromagnetic valve, and further comprises a temperature controller, a pulse controller and a valve controller which are sequentially connected, the output end of the valve controller is connected with the control end of the electromagnetic valve, the upper main shaft and the lower main shaft are respectively provided with a temperature sensor for collecting temperature signals and a temperature transmitter which is arranged on the temperature sensor and used for outputting the temperature signals to the temperature controller, and the temperature transmitter is connected with the temperature controller.

8. The numerical control machine tool according to claim 7, characterized in that: the temperature controller is an IP controller, and can calculate the ventilation frequency and the opening and closing time of the air inlet pipe according to the temperature deviation between the preset working temperature value and the measured actual working temperature and transmit the ventilation frequency and the opening and closing time to the pulse controller; the pulse controller is used for receiving a control signal of the temperature controller, converting the control signal into a pulse control timing signal and transmitting the timing signal to the valve controller; and the valve controller is used for receiving the time sequence signal of the pulse controller to form an electromagnetic valve control signal and controlling the electromagnetic valve to be opened or closed according to the calculated frequency and duration.

9. The numerical control machine tool according to claim 8, wherein: the mixer is characterized in that a mixer is further arranged on the air inlet pipe, the mixer is a spherical body with an inner cavity, a storage tank filled with cooling liquid is arranged in the mixer, a spiral pipe is arranged between the inner wall of the mixer and the storage tank, one connecting end of the air inlet pipe and the mixer is inserted into the input end of the spiral pipe in the mixer to be communicated and is in contact with the outer wall of the storage tank, and the other connecting end of the air inlet pipe and the mixer is connected with the output end of the spiral pipe.

10. A machining method of a numerically controlled machine tool adapted to a numerically controlled machine tool according to claim 1, comprising the steps of:

s1: the motor drives the driving wheel to rotate, the lower main shaft is driven to rotate through the second belt, the lower main shaft drives the upper main shaft to rotate through the first belt, and the upper main shaft and the lower main shaft synchronously drive to work to process a workpiece;

s2: the sliding block slides downwards on the inclined rod by means of self gravity, the tensioning wheel is driven by the sliding block and the push rod to move rightwards in the horizontal groove by means of the gravity of the sliding block until the sliding block stops moving due to stress balance, the tensioning wheel tensions a second belt, and the tensioning force of the second belt is kept stable all the time under the condition of stress balance;

s3: the temperature of the upper main shaft and the lower main shaft is increased along with the increase of the working time, the temperature sensor detects temperature signals near a processing position and transmits the temperature signals to the temperature controller, and the temperature controller controls the valve controller through the pulse controller according to the temperature deviation between the preset working temperature value and the detected actual working temperature so as to control the opening and closing frequency of the electromagnetic valve, namely control the frequency of the introduced cooling air and automatically cool the upper main shaft and the lower main shaft;

s4: under the conditions of automatically adjusting the tension and automatically adjusting the temperature during machining, the machine tool stably works.

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