CN110026815B - Hole milling device - Google Patents

Hole milling device Download PDF

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Publication number
CN110026815B
CN110026815B CN201910319180.2A CN201910319180A CN110026815B CN 110026815 B CN110026815 B CN 110026815B CN 201910319180 A CN201910319180 A CN 201910319180A CN 110026815 B CN110026815 B CN 110026815B
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liquid nitrogen
valve
flow
temperature
milling
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CN110026815A (en
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王凤彪
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Shenyang Ligong University
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Shenyang Ligong University
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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
    • 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
    • B23Q11/0042—Devices for removing chips
    • B23Q11/005—Devices for removing chips by blowing
    • 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
    • B23Q11/10—Arrangements for cooling or lubricating tools or work

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

A hole milling device belongs to the technical field of hole milling, and particularly relates to a hole milling device. The invention provides a hole milling device with a good cooling effect. The external transmission internal cooling cutter comprises an external transmission internal cooling cutter handle 7, a liquid nitrogen container, an electromagnetic valve and a flow regulating valve, and is structurally characterized in that a milling cutter is installed on the external transmission internal cooling cutter handle 7, the liquid nitrogen container, the electromagnetic valve, the flow regulating valve and a cooling liquid inlet of the external transmission internal cooling cutter handle 7 are sequentially connected, a liquid nitrogen channel is arranged in the milling cutter, the upper end of the liquid nitrogen channel is communicated with the cooling liquid inlet, and the lower end of the liquid nitrogen channel is communicated with a liquid nitrogen nozzle at the lower part.

Description

Hole milling device
Technical Field
The invention belongs to the technical field of hole milling, and particularly relates to a hole milling device.
Background
The quartz fiber reinforced composite material has the advantages of good mechanical property, high and low temperature resistance, stable physical and chemical properties and the like, and is widely applied to the fields of aerospace, national defense and military industry and the like. However, since the material is mostly an anisotropic and non-uniform laminated material, the defects of layering, burrs, ablation and the like cannot be avoided in the traditional hole making processes such as milling, drilling and the like. For example, when a large-diameter and deep hole is manufactured, due to the fact that bonding strength among fiber layers is small, cutting force is large, and severe delamination and burr defects caused by fiber force avoidance occur at the inlet and the outlet of the hole. When the hole is made at high speed, due to the lower thermal conductivity of the composite material and the difficulty in cooling the composite material by cutting fluid, the temperature in the hole is too high to cause serious ablation defect.
Disclosure of Invention
The invention aims at the problems and provides a hole milling device with a good cooling effect.
In order to achieve the purpose, the invention adopts the following technical scheme that the external transmission internal cooling cutter comprises an external transmission internal cooling cutter handle 7, a liquid nitrogen container, an electromagnetic valve and a flow regulating valve, and is structurally characterized in that a milling cutter is installed on the external transmission internal cooling cutter handle 7, the liquid nitrogen container, the electromagnetic valve, the flow regulating valve and a cooling liquid inlet of the external transmission internal cooling cutter handle 7 are sequentially connected, a liquid nitrogen channel is arranged in the milling cutter, the upper end of the liquid nitrogen channel is communicated with the cooling liquid inlet, and the lower end of the liquid nitrogen channel is communicated with a liquid nitrogen nozzle at.
As a preferable scheme, the distance between the liquid nitrogen nozzle and the blade is less than or equal to 1 mm.
As another preferred scheme, the liquid nitrogen nozzle is arranged in the middle of the milling cutter, and the spraying direction of the liquid nitrogen nozzle is the outer lower direction.
As another preferred scheme, the invention controls the instantaneous temperature of the cutting area by controlling the flow of liquid nitrogen.
As another preferred scheme, the diameter of the liquid nitrogen channel is 0.5 mm-1 mm.
As another preferred scheme, the external transmission inner cooling tool shank 7 is clamped in a taper hole of a machine tool spindle.
As another preferred scheme, the liquid nitrogen container is connected with the electromagnetic valve through a heat insulation hose.
As another preferred scheme, a hose joint is arranged between the flow regulating valve and a cooling liquid inlet of the external transmission inner cooling tool handle 7.
As another preferred scheme, the hose connector provided by the invention adopts a G3/8 taper hole connector.
As another preferred scheme, the liquid nitrogen container adopts a Dewar flask, the electromagnetic valve adopts a low-temperature electromagnetic valve, the flow regulating valve adopts a low-temperature flow regulating valve, and the hose joint adopts a low-temperature hose joint.
As another preferred scheme, a control signal input port of the flow regulating valve is connected with a control signal output port of a processor, and a detection signal input port of the processor is connected with a detection signal output port of a temperature thermocouple for detecting the temperature of a liquid nitrogen nozzle of a cutter through a data acquisition card.
Secondly, the temperature thermocouple is fixed on the outer rotating inner cooling knife handle 7, and the contact of the temperature thermocouple is arranged at the position of the milling cutter 8 close to a liquid nitrogen nozzle.
In addition, the temperature of the liquid nitrogen nozzle collected by the temperature thermocouple 10 of the inventionK 2The data is transmitted to a data acquisition card 12 through a data transmission cable 11 and then transmitted to a processor 13; a liquid nitrogen temperature and flow database is arranged in the processor, the flow range is from 1L/h to 35L/h, and the temperature range is from-190 ℃ to-0 ℃; setting a liquid nitrogen spout temperature reference valueK 1And simultaneously measuring the temperature of 8 liquid nitrogen nozzles of the milling cutterK 2And feeds back to the processor according to the formulaK=|K 1-K 2I judges the temperature error of the nozzle whenKThe temperature is more than or equal to 5 ℃, the processor controls the flow regulating valve 4 to regulate the flow of the liquid nitrogen if the temperature is higher than or equal to 5 DEG, andK 2is greater thanK 1Adjust the flow rate ifK 2Is less thanK 1Regulating the flow rate to be small, measuring the temperature of the liquid nitrogen nozzle of the cutter 8 again after 5 secondsK 2Repeating the above regulationProcedure until ΔK≤5℃。
The invention has the beneficial effects.
The invention can realize high-quality high-efficiency cryogenic milling by reducing the temperature of the cutting area in a short distance through liquid nitrogen.
The liquid nitrogen is sprayed out from the liquid nitrogen nozzle to remove chips from the milled holes, so that the utilization rate of the liquid nitrogen is improved.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic view of the milling cutter structure of the present invention.
FIG. 3 is a schematic structural diagram of a gas regulating system of a liquid nitrogen internal-injection type numerical control milling and drilling machine of the invention, wherein: the device comprises a humidity tester 1.1, an alarm 1.2, a dryer 1.3, a filter valve 1.4, an exhaust fan 1.5, a direct discharge control valve 1.6, a flow rate control valve 1.7, a corrugated pipe 1.8, a controller 1.9, a cable 1.10, a nitrogen concentration tester 2.1, an alarm 2.2, a rotary valve 3.1, a filter screen column 3.2, a purified gas outlet pipe 3.3, a purified gas chamber 3.4, an injection pipe 3.5, a pulse valve 3.6, an inlet 3.7 of a dust removal mechanism and a lower box 3.8.
FIG. 4 is a drawing showing the connection of the air-purifying chamber and the lower box.
FIG. 5 is a valve control circuit diagram (MCU in the figure is a controller) of the gas regulating system of the liquid nitrogen internal-injection type numerical control milling and drilling machine of the invention.
FIG. 6 is a diagram showing the combination state of the hole milling device and the gas regulating system of the liquid nitrogen internal-injection type numerical control drilling and milling machine.
In the drawings 1, 2 and 6, 1-a dewar tank, 2-a liquid nitrogen conveying hose, 3-a low-temperature electromagnetic valve, 4-a low-temperature flow regulating valve, 5-a low-temperature hose joint, 6-a main shaft, 7-an external rotating internal cooling tool handle, 8-a hollow milling tool, 9-a workpiece, 10-a temperature thermocouple, 11-a data transmission cable, 12-a data acquisition card, 13-a processor, 14-a blade, 15-liquid nitrogen and 16-a hole machining post-milling tool position.
Detailed Description
As shown in the figure, the external transmission internal cooling cutter comprises an external transmission internal cooling cutter handle 7, a liquid nitrogen container, an electromagnetic valve and a flow regulating valve, wherein a milling cutter is installed on the external transmission internal cooling cutter handle 7 (a cutter handle device disclosed in Chinese patent CN201410228633.8 can be adopted), the liquid nitrogen container, the electromagnetic valve, the flow regulating valve and a cooling liquid inlet of the external transmission internal cooling cutter handle 7 are sequentially connected, a liquid nitrogen channel is arranged in the milling cutter, the upper end of the liquid nitrogen channel is communicated with the cooling liquid inlet, and the lower end of the liquid nitrogen channel is communicated with a liquid nitrogen nozzle.
The distance between the liquid nitrogen nozzle and the blade is less than or equal to 1 mm.
The liquid nitrogen nozzle is arranged in the middle of the milling cutter, and the spraying direction of the liquid nitrogen nozzle is the outer lower side.
The invention controls the instantaneous temperature of the cutting area by controlling the flow of liquid nitrogen.
The diameter of the liquid nitrogen channel is 0.5 mm-1 mm.
The external transmission internal cooling tool shank 7 is clamped in a taper hole of a machine tool spindle.
The revolution speed of the cutter around the hole axis can be set to be 20-60 r/min, the rotation speed of the cutter (the main shaft speed) can be set to be 1000-8000 r/min, and the feed amount can be set to be 0.01-0.05 mm/r.
The liquid nitrogen container is connected with the electromagnetic valve through a heat insulation hose.
And a hose joint is arranged between the flow regulating valve and the cooling liquid inlet of the outer transmission inner cooling knife handle 7.
The hose joint adopts a G3/8 taper hole joint.
The liquid nitrogen container adopts a Dewar flask, the electromagnetic valve adopts a low-temperature electromagnetic valve, the flow regulating valve adopts a low-temperature flow regulating valve, and the hose connector adopts a low-temperature hose connector.
And a control signal input port of the flow regulating valve is connected with a control signal output port of the processor, and a detection signal input port of the processor is connected with a detection signal output port of a temperature thermocouple for detecting the temperature of a liquid nitrogen nozzle of the cutter through a data acquisition card.
The temperature thermocouple is fixed on the outer cold knife handle 7, and the contact of the temperature thermocouple is arranged at the position of the milling cutter 8 close to the liquid nitrogen nozzle.
Said temperatureLiquid nitrogen nozzle temperature collected by thermocouple 10K 2The data is transmitted to a data acquisition card 12 through a data transmission cable 11 and then transmitted to a processor 13; a liquid nitrogen temperature and flow database is arranged in the processor, the flow range is from 1L/h to 35L/h, and the temperature range is from-190 ℃ to-0 ℃; setting a liquid nitrogen spout temperature reference valueK 1(for the TC4 titanium alloy material,K 1take 145 degrees centigrade. In the case of an aramid fiber material,K 1take 180 degrees centigrade. In the case of a quartz fiber material,K 1the temperature was taken to be 165 ℃. ) Simultaneously measuring the temperature of 8 liquid nitrogen nozzles of the milling cutterK 2And feeds back to the processor according to the formulaK=|K 1-K 2I judges the temperature error of the nozzle whenKThe temperature is more than or equal to 5 ℃, the processor controls the flow regulating valve 4 to regulate the flow of the liquid nitrogen if the temperature is higher than or equal to 5 DEG, andK 2is greater thanK 1Adjust the flow rate ifK 2Is less thanK 1Regulating the flow rate to be small, measuring the temperature of the liquid nitrogen nozzle of the cutter 8 again after 5 secondsK 2Repeating the above adjustment process until ΔK≤5℃。
The invention can be applied to the hole milling of the quartz fiber composite material, the quartz fiber composite material is cut into regular rectangular blocks, the surface of a workpiece is cleaned by strong wind, and the workpiece is positioned and clamped on a numerical control machine tool workbench according to the positioning rule.
The surface of the valve joint can be provided with a ceramic layer, so that the heat insulation property is improved.
The cutting speed of the milling cutter is 100m/min, the feeding amount is 0.07mm/r, and the cutting depth is 1.5mm (for TC4 titanium alloy material), 1.2mm (for aramid fiber material) and 1.2mm (for quartz fiber material).
As shown in fig. 2, low-temperature liquid nitrogen 1 is sprayed to a contact point of a blade 3 and a workpiece 4 of the milling cutter through a liquid nitrogen nozzle to perform short-time precooling on the surface of the workpiece 4, and a machine tool feeding system is started after the temperature of the liquid nitrogen nozzle reaches a preset low temperature, so that ultralow-temperature cooling hole milling work of the diameter of the milling cutter tip is realized.
If the large-diameter deep hole milling work is to be finished, firstly, the shallow bottom hole milling work is finished, and according to the moving path shown in the figure 2, the milling cutter 2 mills and sweeps the position of the hollow cutter bar 5 after any hole of the workpiece 4 is machined by setting the moving path of the machine tool main shaft, so that the ultralow-temperature milling and reaming work of circular holes and irregular holes with different apertures can be realized; and the deep hole milling and hole making work can be realized by feeding in the hole depth direction again and repeating the hole expanding operation.
The hole milling device can be provided with a gas regulating system of a liquid nitrogen internal-injection type numerical control drilling and milling machine.
The gas regulating system of the liquid nitrogen internal-spraying type numerical control drilling and milling machine comprises a humidity tester inside a drilling and milling machine bin, a nitrogen concentration monitor inside the drilling and milling machine (namely the hole milling device of the invention), a dryer inside the drilling and milling machine bin, a controller, an exhaust fan, a direct-discharging control valve, a flow rate control valve and a dust removal mechanism, wherein an alarm signal output port of the humidity tester is connected with an alarm signal input port of a humidity alarm, and an alarm signal output port of the nitrogen concentration monitor is connected with an alarm signal input port of the nitrogen concentration alarm;
the filter valve is arranged at the top of the drilling and milling machine bin, the inlet end of the filter valve is communicated with the interior of the drilling and milling machine bin, the outlet end of the filter valve is connected with the inlet end of the exhaust fan through a pipeline, the outlet end of the exhaust fan is connected with the inlet end of the direct discharge control valve through a pipeline, the outlet end of the direct discharge control valve is connected with the inlet end of the flow rate control valve through a pipeline, and the outlet end of the flow rate control valve is connected with the inlet end of the dust removal mechanism through a pipeline;
the detection signal input port of the controller is respectively connected with the detection signal output port of the humidity tester and the detection signal output port of the nitrogen concentration monitor, and the control signal output port of the controller is respectively connected with the control signal input port of the dryer, the control signal input port of the direct discharge control valve, the control signal input port of the flow rate control valve, the control signal input port of the dust removal mechanism and the control signal input port of the filter valve.
The gas regulating system of the liquid nitrogen internal-injection type numerical control drilling and milling machine realizes normal operation and safe operation of a cryogenic low-temperature cutting machine tool by monitoring the humidity of a machining area of the machine tool and the concentration of liquid nitrogen.
The gas regulating system of the liquid nitrogen internal-injection type numerical control drilling and milling machine can reduce the air humidity in the processing bin of the numerical control machine, control the nitrogen concentration and prevent nitrogen poisoning of operators.
The dryer and the exhaust fan of the gas regulating system of the liquid nitrogen internal-spraying type numerical control drilling and milling machine can reduce the water vapor content in the cabin of the drilling and milling machine, reduce frosting and ensure the accurate work of the low-temperature liquid nitrogen internal-spraying main shaft.
The humidity tester adopts a HKT60P type humidity tester.
The humidity tester is composed of a key module, an LED humidity display, a single chip microcomputer and a humidity sensor, wherein the single chip microcomputer is respectively connected with the key module, the LED humidity display and the humidity sensor, and the humidity sensor is installed on a spindle box of the drilling and milling machine.
The nitrogen concentration detector adopts a MOT500-N2 type nitrogen concentration detector.
The nitrogen concentration detector comprises a key module, an LED nitrogen concentration display, a single chip microcomputer and a nitrogen concentration sensor, wherein the single chip microcomputer is respectively connected with the key module, the LED nitrogen concentration display and the concentration sensor, and the nitrogen concentration sensor is arranged on a spindle box of the drilling and milling machine.
The pipeline between the outlet end of the exhaust fan and the inlet end of the direct discharge control valve, the pipeline between the outlet end of the direct discharge control valve and the inlet end of the flow rate control valve, and the pipeline between the outlet end of the flow rate control valve and the inlet end of the dust removal mechanism adopt corrugated pipes; the pipeline between the outlet end of the filter valve and the inlet end of the exhaust fan adopts a hose.
The dust removal mechanism comprises a lower box body 3.8 and an upper box body, one side of the lower box body 3.8 is an inlet end of the dust removal mechanism connected with an outlet end of the flow rate control valve, the lower end of the lower box body 3.8 is a funnel-shaped slag discharge port, and a rotary valve 3.1 is arranged at the slag discharge port;
the lower end of the upper box body is provided with a through hole communicated with the interior of the lower box body 3.8, and a filter screen column (the bottom surface is a screen surface) extending downwards into the interior of the lower box body 3.8 is arranged at the through hole;
a transverse injection pipe 3.5 is arranged in the upper box body, one end of the injection pipe 3.5 penetrates through the upper box body and is connected with a pulse valve 3.6, the pulse valve 3.6 is arranged on the side, close to the inlet end of the dust removal mechanism, of the upper box body, and a clean gas outlet pipe 3.3 which inclines upwards is arranged on the side, far away from the inlet end of the dust removal mechanism, of the upper box body;
the lower end of the blowing pipe 3.5 is provided with an inlet, the position of the inlet corresponds to the upper end of the filter screen column, and a detection signal output port of the pulse valve 3.6 is connected with a detection signal input port of the controller.
A guide plate is arranged in the lower box body 3.8 corresponding to the inlet end of the dust removing mechanism, the guide plate comprises an upper vertical plate and a folded plate with the lower part bent inwards and downwards, and the lower end of the upper vertical plate is lower than the lower end of the inlet end of the dust removing mechanism; the air flow enters from the inlet end of the dust removing mechanism, is guided downwards by the guide plate and then upwards passes through the filter screen column.
The upper end of the upper box body is provided with a gas purifying chamber 3.4; the air purifying chamber 3.4 is connected with the upper box body through a bolt, the lower end of the air purifying chamber 3.4 is provided with a boss extending downwards, the boss is inserted into an opening at the top of the upper box body, a grid is arranged at an opening in the middle of the lower end of the boss, and an activated carbon powder bag is arranged in the air purifying chamber; and a sealing ring is arranged between the outer wall of the boss and the side wall of the top opening of the upper box body.
The inner wall of the upper box body at the inner lower end of the purified gas outlet pipe 3.3 is provided with a guide plate which inclines inwards, and the purified gas chamber is arranged at the rear side of the guide plate. The guide plate guides the airflow to the rear side to contact with the activated carbon powder bag in the clean air chamber and then flow out of the upper box body.
The dryer can adopt an electric dryer with a high-power resistance wire, and the electric dryer can be arranged on a fixed surface of a workbench of a milling and drilling machine.
The controller receives a humidity signal of the humidity tester, and starts the dryer when the humidity exceeds a set value.
The controller receives a nitrogen concentration signal of the nitrogen concentration monitor, and when the nitrogen concentration exceeds a set value, the exhaust fan is started.
The pulse valve 3.6 changes the gas continuous flow signal into a pulse signal, feeds the pulse signal back to the controller, and monitors the outlet pressure.
The dusty gas flow enters the lower box 3.8 from the inlet end 3.7 of the dust removal mechanism, enters the upper box through the filter screen column 3.2, and is finally discharged from the clean gas outlet pipe 3.3, as shown in fig. 3, arrows in the lower box 3.8 and the upper box are directed towards the gas flow.
Detecting the air humidity inside the drilling and milling machine bin, if the air humidity is larger than a set value (the set values of different materials in ultralow-temperature cooling processing are different, the set value of the humidity is smaller than 10% for metal materials, and the set value range of the humidity of composite materials is 3% -7%), alarming by an alarm, starting a dryer for heating, starting a fan to pump away redundant gas, and stopping the dryer and the exhaust fan after the air humidity meets the requirement;
and detecting the concentration of liquid nitrogen in the drilling and milling machine bin, if the concentration of the liquid nitrogen is greater than a set value, alarming by an alarm, starting an exhaust fan to extract redundant nitrogen, and stopping the exhaust fan after the concentration of the nitrogen meets the requirement.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims (8)

1. A hole milling device comprises an external rotating and internal cooling tool handle, a liquid nitrogen container, an electromagnetic valve and a flow regulating valve, and is structurally characterized in that a milling cutter is mounted on the external rotating and internal cooling tool handle, the liquid nitrogen container, the electromagnetic valve, the flow regulating valve and a cooling liquid inlet of the external rotating and internal cooling tool handle are sequentially connected, a liquid nitrogen channel is arranged in the milling cutter, the upper end of the liquid nitrogen channel is communicated with the cooling liquid inlet, and the lower end of the liquid nitrogen channel is communicated with a liquid nitrogen nozzle at the lower part of the milling;
a control signal input port of the flow regulating valve is connected with a control signal output port of the processor, and a detection signal input port of the processor is connected with a detection signal output port of a temperature thermocouple for detecting the temperature of a liquid nitrogen nozzle of the cutter through a data acquisition card;
the temperature K2 of the liquid nitrogen nozzle collected by the temperature thermocouple is transmitted to a data acquisition card through a data transmission cable, and then the data is transmitted to a processor; a liquid nitrogen temperature and flow database is arranged in the processor, the flow range is from 1L/h to 35L/h, and the temperature range is from-190 ℃ to-0 ℃; setting a reference value K1 of the liquid nitrogen nozzle temperature, measuring the liquid nitrogen nozzle temperature K2 of the milling cutter, feeding the liquid nitrogen nozzle temperature K2 back to the processor, judging the nozzle temperature error through a formula K = | K1-K2|, when K is more than or equal to 5 ℃, controlling the flow regulating valve by the processor to regulate the liquid nitrogen flow, regulating the flow if K2 is more than K1, regulating the flow if K2 is less than K1, reducing the flow, measuring the liquid nitrogen nozzle temperature K2 again after 5 seconds, and repeating the regulation process until K is less than or equal to 5 ℃.
2. A hole milling device according to claim 1, characterized in that the liquid nitrogen nozzle is arranged in the middle of the milling cutter, and the spraying direction of the liquid nitrogen nozzle is outward and downward.
3. A hole milling apparatus according to claim 1, wherein the instantaneous temperature of the cutting zone is controlled by controlling the flow of liquid nitrogen.
4. A hole milling apparatus as claimed in claim 1, wherein the outer and inner cooled tool shanks are mounted and clamped in tapered bores in the spindle of the machine tool.
5. A hole milling apparatus according to claim 1, wherein the liquid nitrogen container is connected to the solenoid valve through a heat insulation hose.
6. A hole milling apparatus as claimed in claim 1, wherein a hose connection is provided between the flow control valve and the coolant inlet of the outer and inner cold shank.
7. A hole milling device according to claim 1, wherein the liquid nitrogen container is a Dewar tank, the electromagnetic valve is a cryogenic electromagnetic valve, the flow control valve is a cryogenic flow control valve, and the hose connector is a cryogenic hose connector.
8. A hole milling device according to claim 1, wherein a gas regulating system is provided, the gas regulating system comprises a humidity tester inside the drilling and milling machine cabin, a nitrogen concentration monitor inside the drilling and milling machine cabin, a dryer inside the drilling and milling machine cabin, a controller, an exhaust fan, a direct exhaust control valve, a flow rate control valve and a dust removal mechanism, an alarm signal output port of the humidity tester is connected with an alarm signal input port of a humidity alarm, and an alarm signal output port of the nitrogen concentration monitor is connected with an alarm signal input port of the nitrogen concentration alarm;
the filter valve is arranged at the top of the drilling and milling machine bin, the inlet end of the filter valve is communicated with the interior of the drilling and milling machine bin, the outlet end of the filter valve is connected with the inlet end of the exhaust fan through a pipeline, the outlet end of the exhaust fan is connected with the inlet end of the direct discharge control valve through a pipeline, the outlet end of the direct discharge control valve is connected with the inlet end of the flow rate control valve through a pipeline, and the outlet end of the flow rate control valve is connected with the inlet end of the dust removal mechanism through a pipeline;
the detection signal input port of the controller is respectively connected with the detection signal output port of the humidity tester and the detection signal output port of the nitrogen concentration monitor, and the control signal output port of the controller is respectively connected with the control signal input port of the dryer, the control signal input port of the direct discharge control valve, the control signal input port of the flow rate control valve, the control signal input port of the dust removal mechanism and the control signal input port of the filter valve.
CN201910319180.2A 2019-04-19 2019-04-19 Hole milling device Active CN110026815B (en)

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CN113560061B (en) * 2020-04-29 2023-02-03 南京航太机电有限公司 Temperature-adjustable low-temperature gas spray gun system
CN113560495B (en) * 2021-07-28 2022-05-03 南京航空航天大学 Low-temperature airflow follow-up auxiliary sand discharge device and method for frozen sand mold cutting

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CN101209528A (en) * 2006-12-26 2008-07-02 浙江工业大学 Cooling device for cutting process
FR2966371B1 (en) * 2010-10-22 2013-08-16 Air Liquide PROCESS AND INSTALLATION FOR MACHINING WITH CRYOGENIC COOLING
CN103962584B (en) * 2014-04-30 2016-04-13 大连理工大学 Liquid nitrogen internal combustion numerical control drilling milling machine main shaft device
CN104015079B (en) * 2014-05-27 2016-04-06 大连理工大学 A kind of liquid nitrogen internal combustion handle device
KR101626553B1 (en) * 2014-10-29 2016-06-01 서울과학기술대학교 산학협력단 Freeze type processing apparatus for ductile workpiece
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