Nanofluid minimal quantity lubrication auxiliary grinding wheel dressing device and method

Abstract

The invention relates to the technical field of grinding wheel dressing, in particular to a nanofluid minimal quantity lubrication auxiliary grinding wheel dressing device and method.The nanofluid minimal quantity lubrication auxiliary grinding wheel dressing device comprises a nanofluid minimal quantity lubrication mixed liquid supply system, a nano-fluid minimal quantity lubrication auxiliary grinding wheel dressing system and a nano-fluid minimal quantity lubrication auxiliary grinding wheel dressing system, the grinding machine tool comprises a grinding machine workbench, a grinding machine spindle and a mixed liquid output nozzle, the moving direction of the grinding machine workbench is perpendicular to the rotating axial direction of the grinding machine spindle, the grinding machine workbench is provided with a diamond pen grinding wheel dresser and moves along with the diamond pen grinding wheel dresser, and a grinding wheel to be dressed is placed on the grinding machine spindle. The mixed liquid output nozzle is communicated with the nanofluid minimal quantity lubrication mixed liquid supply system and is aligned to a grinding wheel dressing area; the problems that in the mechanical grinding wheel dressing process, abrasive particles and binding agent residues on the surface of the grinding wheel are not prone to being removed or the cleaning process is tedious, the dressing force of mechanical grinding wheel dressing is high and uneven, and therefore the abrasive particles fall off and are broken, and the protruding height is irregular in the dressing process are solved.

Description

Technical Field

[0001] The invention relates to the technical field of grinding wheel dressing, in particular to a nanofluid micro-lubrication assisted grinding wheel dressing device and method. Background Art

[0002] Grinding wheel dressing is divided into two types: shaping and sharpening. Shaping is to re-process the surface profile and dimensional accuracy of the grinding wheel to meet the specific working requirements and working conditions during grinding. Sharpening is the process of processing the abrasive and binder on the surface of the grinding wheel. Through sharpening, the abrasive on the surface of the grinding wheel can reach a sharp state, so that the abrasive can maintain a high material removal rate during grinding.

[0003] The current grinding wheel dressing processes mainly include dry mechanical grinding wheel dressing, grinding fluid pouring mechanical grinding wheel dressing, jet, electric spark discharge, laser, ultrasonic assisted and composite grinding wheel dressing processes. Dry mechanical grinding wheel dressing is the process of dressing the grinding wheel to be dressed using a single-point, roller or grinding type dresser. For example, "A diamond grinding wheel dressing method" (CN108838890B) uses a metal bond diamond grinding wheel to perform grinding and dressing on the diamond grinding wheel to be dressed. After grinding and dressing, the dressed grinding wheel is ultrasonically cleaned. The use of metal bond diamond grinding wheel dressing can improve the accuracy of the dressed grinding wheel. However, in the process of mechanical grinding wheel dressing, the abrasive and binder residues on the grinding wheel surface are not easy to be removed or the cleaning process is cumbersome, and the dressing force of mechanical grinding wheel dressing is high and uneven, which will cause the abrasive to fall off, break, and protrude irregularly during the dressing process. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a nanofluid micro-lubrication assisted grinding wheel dressing device and method, which solves the problem that abrasive particles and binders remaining on the grinding wheel surface are not easy to be removed during the mechanical grinding wheel dressing process through the nanofluid micro-lubrication assistance, reduces the mechanical grinding wheel dressing force, and reduces the abrasive particles falling off, breaking, and irregular protrusion height during the dressing process. In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0005] In a first aspect, the present invention provides a nanofluid micro-lubrication assisted grinding wheel dressing device, comprising:

[0006] Nanofluid micro-lubrication mixed liquid supply system can automatically mix nanoparticles and micro-lubrication base liquid into nanofluid micro-lubrication mixed liquid according to proportion;

[0007] The grinding machine tool comprises a grinding table, a grinding spindle and a mixed liquid output nozzle. The movement direction of the grinding table is perpendicular to the rotation axis of the grinding spindle. The grinding table is provided with a diamond pen grinding wheel dresser and moves with it. The grinding spindle is placed with a grinding wheel to be dressed. The mixed liquid output nozzle is connected to the nanofluid micro-lubrication mixed liquid supply system and is aligned with the grinding wheel dressing area.

[0008] As a further implementation, the diamond dressing tip of the diamond pen grinding wheel dresser is hemispherical.

[0009] As a further implementation, the diamond pen grinding wheel dresser can be deflected by a set angle in the radial direction and the axial direction.

[0010] As a further implementation, the mixed liquid output nozzle is provided with an atomization cone angle.

[0011] In a second aspect, the present invention provides a nanofluid micro-lubrication assisted grinding wheel dressing method, which is performed using the nanofluid micro-lubrication assisted grinding wheel dressing device as described in the first aspect, and comprises the following steps:

[0012] The nanoparticles and the micro-lubricating base fluid are input into an ultrasonic vibration stirrer in a certain proportion and mixed to obtain a nanofluid mixed liquid;

[0013] The grinding wheel to be dressed is mounted and fixed on the main shaft of the grinding machine, and the diamond pen grinding wheel dresser is vertically mounted in the dresser fixture on the grinding machine. The diamond pen grinding wheel dresser is deflected by a set angle in the radial direction along the rotation direction of the grinding wheel and by a set angle in the axial direction;

[0014] Setting grinding wheel dressing parameters, nanofluid micro-lubrication mixed liquid supply system parameters, and geometric parameters of the mixed liquid output nozzle and the bottom cutting plane of the grinding wheel to be dressed; starting the machine to perform nanofluid micro-lubrication assisted dressing processing on the grinding wheel to be dressed;

[0015] Stop the machine, remove the diamond pen grinding wheel dresser from the diamond pen grinding wheel dresser fixture, and return it to the warehouse.

[0016] As a further implementation method, the nanoparticles are silicon dioxide, silicon carbide, and graphite, and the minimal lubrication base fluid is peanut oil, soybean oil, palm oil, olive oil, and coconut oil.

[0017] As a further implementation method, the diamond pen grinding wheel dresser is set to have a deflection angle of 3° to 140° in the radial direction along the grinding wheel rotation direction, and a deflection angle of -65° to 65° in the axial direction.

[0018] As a further implementation, the grinding wheel dressing parameters include the grinding machine spindle speed n w , Grinding wheel axial dressing feed rate vf , grinding wheel dressing depth a d , trimming overlap ratio C d and the number of dressing feed cycles k; the parameters of the nanofluid micro-lubrication mixture supply system include the nanofluid micro-lubrication flow rate V and the nanofluid micro-lubrication output air pressure P; the geometric parameters of the mixture output nozzle and the tangent plane at the bottom of the grinding wheel to be dressed include the vertical distance a, the horizontal distance b and the angle γ.

[0019] As a further implementation method, the calculation formula of the angle γ is:

[0020] When C d ≥1,

[0021] When C d When ≤1,

[0022] Where: C d is the trimming overlap ratio, e d is the effective dressing width of the diamond wheel dresser, f d is the dressing lead, r is the radius of the hemispherical diamond dressing tip, and θ is the atomization cone angle of the mixed liquid output nozzle.

[0023] As a further implementation method, the nanofluid micro-lubrication mixture needs to be subjected to ultrasonic vibration to make it evenly mixed. The parameters of the nanofluid micro-lubrication mixture that need to be subjected to ultrasonic vibration include ultrasonic vibration frequency H and ultrasonic vibration time T.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The nanofluid micro-lubricant mixed liquid of the present invention is composed of nanoparticles and micro-lubricant base liquid. In the nanofluid micro-lubricant assisted grinding wheel dressing process, the nanoparticles and micro-lubricant base liquid sprayed onto the surface of the dressed grinding wheel can improve the lubrication effect of the grinding wheel dresser, reduce the friction between the grinding wheel dresser and the dressed grinding wheel, solve the problem that the abrasive particles and binder residues on the grinding wheel surface are not easy to be removed during the mechanical grinding wheel dressing process, reduce the dressing force of the grinding wheel dresser, improve the surface profile size accuracy and quality of the dressed grinding wheel, and reduce the shedding, breakage and irregular protrusion height of the abrasive particles.

[0026] 2. The present invention expands the research and application fields of nanofluid micro-lubrication technology and mechanical grinding wheel dressing, and the nanofluid micro-lubrication mixed liquid is used in a small amount during the grinding wheel dressing process, and has little pollution to the processing environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 It is a schematic diagram of the structure of a nanofluid micro-lubrication assisted grinding wheel dressing device in an embodiment of the present invention.

[0029] Figure 2 yes Figure 1 A partial enlarged view of the main view of the nanofluid minimal lubrication assisted diamond pen grinding wheel dresser dressing the ceramic bond silicon carbide grinding wheel at A in the middle.

[0030] Figure 3 yes Figure 1 A partial enlarged view of the side view of the nanofluid minimal lubrication assisted diamond pen grinding wheel dresser dressing the vitrified bond silicon carbide grinding wheel at point A in the middle.

[0031] Figure 4 yes Figure 1 A partial enlarged view of the main view of the metal-bonded diamond grinding wheel being dressed by a diamond pen grinding wheel dresser assisted by nanofluid minimal lubrication at point A in the middle.

[0032] Figure 5 yes Figure 1 A partial enlarged view of the side view of the metal-bonded diamond grinding wheel being dressed by a diamond pen dresser assisted by nanofluid minimal lubrication at point A in the middle.

[0033] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0034] Wherein: 10, nanofluid micro-lubrication mixture supply system; 11, two-position two-way valve; 12, nanofluid micro-lubrication mixture flow regulating valve; 13, ultrasonic vibration stirring blade; 14, high-pressure gas inlet; 15, manual two-position three-way valve; 16, pressure gauge; 17, gas direct-acting pressure regulating spring overflow valve; 18, nanoparticle delivery device drive motor; 19, nanoparticle container; 110, nanoparticles; 111, nanoparticle delivery device; 112, ultrasonic vibration stirring motor; 113, ultrasonic vibration stirrer; 114, nanofluid mixture; 115, micro-lubrication base liquid container; 116, micro-lubrication base liquid; 117, micro-lubrication base liquid delivery device; 118, micro-lubrication base liquid delivery device drive motor; 119, gas throttle valve;

[0035] 20. Grinding machine tool; 21. Grinding wheel frame of grinding machine; 22. Grinding wheel to be dressed; 23. Grinding machine workbench; 24. Diamond pen grinding wheel dresser fixture; 25. Mixed liquid output nozzle; 26. Diamond pen grinding wheel dresser; 27. Grinding machine spindle;

[0036] 31. Pores of ceramic bonded silicon carbide grinding wheel; 32. ceramic bond; 33. Silicon carbide abrasive grains to be dressed; 34. Silicon carbide abrasive grains to be dressed; 41. Metal bonded diamond grinding wheel substrate; 42. Metal bond; 43. Diamond abrasive grains to be dressed; 44. Diamond abrasive grains to be dressed. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] Embodiment 1

[0039] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a nanofluid minimal lubrication assisted grinding wheel dressing device includes a nanofluid minimal lubrication mixed liquid supply system 10 and a grinding machine tool 20.

[0040] The nanofluid micro-lubricant mixed liquid supply system 10 has the functions of automatically mixing nanoparticles and micro-lubricant base liquid into a nanofluid micro-lubricant mixed liquid in proportion, uniformly mixing the nanoparticles in the micro-lubricant base liquid through ultrasonic stirring, and outputting the uniformly mixed nanofluid micro-lubricant mixed liquid to the grinding wheel dressing area through a nozzle.

[0041] Its specific structure and principle: The ultrasonic vibration agitator 113 can stir and mix the nanoparticles 110 passed through the nanoparticle container 19 and the nanoparticle delivery device 111 and the micro-lubricating base fluid 116 passed through the micro-lubricating base fluid container 115 and the micro-lubricating base fluid delivery device 117 through the ultrasonic vibration stirring blade 13, and obtain a nanofluid micro-lubricating mixed fluid 114.

[0042] Nanoparticles 110 are used as nano additives in the nanofluid micro-lubricant mixture to physically or chemically modify the micro-lubricant base fluid. The nanoparticle delivery device 111 has an Archimedean screw shaft built in. The Archimedean screw shaft is driven by the nanoparticle delivery device driving motor 18 to rotate, and the inner cavity is filled with nanoparticles 110 from the nanoparticle container 19. According to the quantitative requirements of the nanoparticles 110, the nanoparticles 110 are delivered to the ultrasonic vibration stirrer 113.

[0043] The micro-lubricating base fluid 116 is a cutting fluid, which can be a water-based, oil-based or water-oil mixed solution. The micro-lubricating base fluid delivery device 117 has an Archimedes screw shaft built in, and the Archimedes screw shaft is driven by the micro-lubricating base fluid delivery device driving motor 118 to drive the Archimedes screw shaft to move, and the inner cavity is filled with the micro-lubricating base fluid 116 through the micro-lubricating base fluid container 115. According to the quantitative requirements of the micro-lubricating base fluid 116, the micro-lubricating base fluid 116 is delivered to the ultrasonic vibration agitator 113.

[0044] The ultrasonic vibration stirring motor 112 has two motion modes: one-dimensional ultrasonic vibration in the up-down direction and rotation of the motor main shaft, which provides ultrasonic vibration and rotational motion and torque for the ultrasonic vibration stirring blade 13. The gas direct-acting pressure regulating spring overflow valve 17 can be used to adjust and limit the air pressure value of the nanofluid micro-lubricating mixed liquid 114 input into the ultrasonic vibration stirrer 113. The pressure gauge 16 is used to display the air pressure value input into the ultrasonic vibration stirrer 113.

[0045] like Figure 1 As shown, the manual two-position three-way valve 15 is the main switch of the nanofluid micro-lubricating mixed liquid supply system 10, and is a control valve that controls the high-pressure gas. The pneumatic two-position two-way valve 11 is the working switch for the output flow of the nanofluid micro-lubricating mixed liquid. The nanofluid micro-lubricating mixed liquid flow regulating valve 12 is used to adjust the output flow of the nanofluid micro-lubricating mixed liquid; the lubricating mixed liquid reaches the mixed liquid output nozzle 25 through the outlet of the ultrasonic vibration stirrer 113, the two-position two-way valve 11, and the nanofluid micro-lubricating mixed liquid flow regulating valve 12.

[0046] The high-pressure gas inlet 14 is a conducting pipeline for high-pressure gas to enter the gas pipeline of the nanofluid micro-lubricant mixed liquid supply system 10 through the manual two-position three-way valve 15; the gas throttle valve 119 is used to adjust the output gas flow rate, such as Figure 1 As shown, the high-pressure gas passes through the manual two-position three-way valve 15 into the branch provided with the gas throttle valve 119, and reaches the mixed liquid output nozzle 25, where the high-speed high-pressure gas meets the lubricating mixed liquid to form an aerosol which is sprayed out by the nozzle.

[0047] Figure 1 Medium and high pressure gases have three movement paths:

[0048] The first path: the high-pressure gas inlet 14 - the manual two-position three-way valve 15 - the gas throttle valve 119 path, the high-pressure gas is mixed with the nanofluid mixed liquid 114 at the mixed liquid output nozzle 25 and atomized.

[0049] The second path: the high-pressure gas inlet 14 - the manual two-position three-way valve 15 - the two-position two-way valve 11 path, the high-pressure gas is used as the pneumatic switching power of the two-position two-way valve 11 to control the two-position two-way valve 11 to open or close;

[0050] The third path: high-pressure gas inlet 14 - manual two-position three-way valve 15 - gas direct-acting pressure regulating spring overflow valve 17 - pressure gauge 16 - ultrasonic vibration stirrer 113 - nanoparticle delivery device 11 - nanofluid micro-lubricating mixed liquid flow regulating valve 12 path, high-pressure gas is used as the power to transport the nanofluid mixed liquid 114 to the mixed liquid output nozzle 25. When the manual two-position three-way valve 15 is opened, the high-pressure gas acts in the above three paths at the same time.

[0051] The grinding machine 20 includes a grinding table 23, a grinding spindle 27, and a mixed liquid output nozzle 25. The movement direction of the grinding table 23 is perpendicular to the rotation axis of the grinding spindle 27. The grinding spindle 27 is mounted on a grinding wheel frame 21. The grinding wheel frame 21 provides the grinding spindle 27 with a movement speed and torque, and drives the grinding spindle 27 and the grinding wheel 22 to be dressed to move in the vertical and axial directions. The grinding accuracy A of the grinding machine 20 in this embodiment is 0.001 μm to 0.01 μm.

[0052] The grinding machine table 23 is provided with a diamond grinding wheel dresser 26 and moves with it. Specifically, the grinding machine table 23 is used to install and fix the diamond grinding wheel dresser fixture 24, and can drive the diamond grinding wheel dresser fixture 24 to move on a horizontal plane. The diamond grinding wheel dresser fixture 24 is used to fix the diamond grinding wheel dresser 26. The diamond grinding wheel dresser 26 is used to process the profile of the grinding wheel 22 to be dressed and the protruding height and height distribution of the surface abrasive grains.

[0053] The grinding wheel 22 to be dressed is mounted on the grinding machine spindle 27 and provides a rotation speed and torque for the grinding wheel 22 to be dressed.

[0054] The mixed liquid output nozzle 25 is used to deliver the nanofluid micro-lubricating mixed liquid 114 to the grinding wheel dressing area. The mixed liquid output nozzle 25 is connected to the ultrasonic vibration stirrer 113 and is aimed at the grinding wheel dressing area.

[0055] The diamond dressing tip of the diamond pen grinding wheel dresser 26 is hemispherical. The top angle σ of the diamond pen grinding wheel dresser 26 is 50° to 100°; the radius r of the hemispherical diamond dressing tip is 50 μm to 1000 μm.

[0056] The diamond pen grinding wheel dresser 26 can be deflected at a set angle in the radial direction and the axial direction. The diamond pen grinding wheel dresser 26 deflects at a certain angle α of 3° to 140° in the radial direction and at a certain angle β of -65° to 65° in the axial direction.

[0057] The mixed liquid output nozzle 25 is provided with an atomization cone angle.

[0058] Embodiment 2

[0059] This embodiment provides a nanofluid micro-lubrication assisted grinding wheel dressing method, which is performed using the nanofluid micro-lubrication assisted grinding wheel dressing device as described in the first embodiment, and includes the following steps:

[0060] S100: The nanoparticles 110 and the micro-lubricating base fluid 116 are input into the ultrasonic vibration stirrer 113 according to a certain ratio for ultrasonic stirring, so that the nanoparticles 110 and the micro-lubricating base fluid 116 are evenly mixed to obtain a nanofluid mixed fluid 114. The mixing is carried out according to a certain ratio, which is a mass ratio or a volume ratio.

[0061] According to actual conditions, the nanoparticles 110 are usually selected from silicon dioxide, silicon carbide, and graphite, and the minimal lubrication base fluid 116 is usually selected from peanut oil, soybean oil, palm oil, olive oil, and coconut oil.

[0062] Generally, the parameters of ultrasonic vibration on the ultrasonic vibration stirrer 113 include ultrasonic vibration frequency H and ultrasonic vibration time T. During ultrasonic vibration stirring, the parameters of ultrasonic vibration are ultrasonic vibration frequency H of 30KHz to 200KHz and ultrasonic vibration time T of 20min to 100min.

[0063] The atomization cone angle of the mixed liquid output nozzle is θ. The calculation formula of the atomization cone angle θ of the mixed liquid output nozzle is:

[0064]

[0065] Where Re is the fluid Reynolds number; Δ is the nozzle structure constant.

[0066] S200: The grinding wheel 22 to be dressed is mounted and fixed on the grinding machine spindle 27.

[0067] The bonding agent type of the grinding wheel 22 to be dressed is usually a vitrified bonding agent, a resin bonding agent, or a metal bonding agent.

[0068] The abrasive grains of the grinding wheel 22 to be dressed are generally cubic boron nitride, diamond, silicon carbide, and aluminum oxide.

[0069] S300: The diamond grinding wheel dresser fixture 24 is fixedly mounted on the grinding machine workbench 23 , and the diamond grinding wheel dresser 26 is vertically mounted in the diamond grinding wheel dresser fixture 24 on the plane of the grinding machine workbench 23 .

[0070] S400: The diamond pen grinding wheel dresser 26 on the plane of the vertical grinding machine worktable 23 is deflected by a certain angle α in the radial direction along the rotation direction of the grinding wheel, and by a certain angle β in the axial direction;

[0071] S500: Setting grinding wheel dressing parameters, nanofluid micro-lubrication mixed liquid supply system 10 parameters, and geometric parameters of the mixed liquid output nozzle 25 and the bottom cutting plane of the grinding wheel 22 to be dressed, starting the grinding machine 20 and the nanofluid micro-lubrication mixed liquid supply system 10, performing nanofluid micro-lubrication assisted dressing processing on the grinding wheel 22 to be dressed, and obtaining the profile of the dressed grinding wheel after dressing.

[0072] Grinding wheel dressing parameters include grinder spindle speed n w , Grinding wheel axial dressing feed rate v f , grinding wheel dressing depth a d , trimming overlap ratio c d and the number of dressing feed cycles k. The dressing parameters of the grinding wheel in the dressing stage are the spindle speed n of the grinding machine. w 1000r / min~5000r / min, axial dressing feed rate v f 2mm / min~400mm / min, grinding wheel dressing depth a d 0.001μm~500μm, trimming overlap rate C d It is 0.5 to 1.5, and the number of dressing feed cycles k is 3 to 50 times.

[0073] Among them, the trimming overlap ratio C d The calculation formula is:

[0074]

[0075] In the formula, e d f is the effective dressing width of the diamond grinding wheel dresser 26, in mm; d It is the trimming lead, and its unit is μm / r.

[0076] The effective dressing width e of the diamond pen grinding wheel dresser 26 d The calculation formula is:

[0077]

[0078] Dressing lead f d The calculation formula is:

[0079]

[0080] The parameters of the nanofluid micro-lubrication mixed liquid supply system 10 include the nanofluid micro-lubrication flow rate V and the nanofluid micro-lubrication output air pressure P. The parameters of the nanofluid micro-lubrication mixed liquid supply system 10 are that the nanofluid micro-lubrication flow rate V is 20ml / h to 100ml / h; the nanofluid micro-lubrication output air pressure P is 2bar to 10bar;

[0081] The geometric parameters of the mixed liquid output nozzle 25 and the bottom tangent plane of the grinding wheel 22 to be dressed include the vertical distance a, the horizontal distance b and the angle γ. The vertical distance a of the mixed liquid output nozzle 25 and the bottom tangent plane of the grinding wheel 22 to be dressed is 2mm-10mm, and the horizontal distance b is 2mm-100mm.

[0082] The calculation formula of the angle γ between the mixed liquid output nozzle 25 and the bottom tangent plane of the grinding wheel 22 to be dressed is:

[0083] When C d ≥1,

[0084] When C d When ≤1,

[0085] The obtained profile parameters of the dressed grinding wheel after dressing include the maximum circular runout E o , roundness error E r .

[0086] By adopting the technical solution of this embodiment, the maximum circular runout E of the trimmed grinding wheel 22 after trimming is o Can reach 10μm~100μm; The roundness error of the profile after dressing of the dressing wheel 22 is E r It can reach 35μm~150μm.

[0087] S600: The grinding machine 20 and the nanofluid micro-lubricant mixed liquid supply system 10 are shut down, and the diamond pen grinding wheel dresser 26 is removed from the diamond pen grinding wheel dresser fixture 24 and returned to the warehouse.

[0088] Test Example 1

[0089] In this test example, graphite / olive oil nanofluid micro-lubrication was used to assist a diamond pen grinding wheel dresser to dress a vitrified bond silicon carbide grinding wheel.

[0090] The nanoparticles 110 used in this test example are graphite, and the micro-lubricating base fluid 116 is olive oil. After mixing, the ultrasonic vibration frequency is 30KHz and the ultrasonic vibration time is 90 minutes.

[0091] The grinding wheel 22 to be dressed is a ceramic bonded silicon carbide grinding wheel, and the grinding accuracy A of the grinding machine spindle 27 fixing the grinding wheel is 0.002 μm. The grinding wheel 22 to be dressed is a ceramic bonded silicon carbide grinding wheel having a ceramic bonded silicon carbide grinding wheel pore 31, a ceramic bond 32 and silicon carbide abrasive grains 34 to be dressed.

[0092] The tip of the diamond wheel dresser 26 is hemispherical, with a vertex angle σ of 90° and a hemispherical radius r of 90 μm. It is vertically mounted in a diamond wheel dresser fixture 24 on the plane of the grinder workbench 23 .

[0093] The diamond pen grinding wheel dresser 26 has a radial deflection angle α of 30° along the grinding wheel rotation direction, and an axial deflection angle β of 30°. Figure 2 and 3 As shown;

[0094] The grinding wheel dressing parameters set are: grinding machine spindle speed n w The grinding wheel axial dressing feed rate is 2000r / min. f 2mm / min, grinding wheel dressing depth a d 1μm, trimming overlap ratio C d is 1 and the number of dressing feed cycles k is 10 times, such as Figure 2 and 3 shown.

[0095] The parameters of the nanofluid micro-lubrication mixed liquid supply system 10 are set as follows: the nanofluid micro-lubrication flow rate V is 50 ml / h, and the nanofluid micro-lubrication output air pressure P is 10 bar.

[0096] The geometric parameters of the mixed liquid output nozzle 25 and the bottom tangent plane of the grinding wheel 22 to be dressed are set as follows: the vertical distance a is 3 mm, the horizontal distance b is 4 mm, and the angle γ is 30°. Figure 2 and 3 shown.

[0097] After the auxiliary dressing process, the silicon carbide abrasive grains 34 to be dressed are called the dressed silicon carbide abrasive grains 33, and the profile of the dressed grinding wheel is obtained. The maximum circular runout E o 40μm, roundness error E r is 90μm.

[0098] Test Example 2:

[0099] This test example uses silicon dioxide / coconut oil nanofluid micro-lubrication to assist the diamond pen grinding wheel dresser 26 to dress the metal bond diamond grinding wheel.

[0100] The nanoparticles 110 used in this test example are silicon dioxide, and the micro-lubricating base fluid 116 is coconut oil. After mixing, the ultrasonic vibration frequency is 60 KHz, and the ultrasonic vibration time is 30 minutes.

[0101] The grinding wheel 22 to be dressed is a metal bond diamond grinding wheel, which comprises a metal bond diamond grinding wheel matrix 41, a metal bond 42 and diamond abrasive grains to be dressed 44. The grinding accuracy A of the grinding machine spindle 27 for fixing the grinding wheel is 0.003 μm.

[0102] The tip of the diamond pen grinding wheel dresser 26 is hemispherical, with a vertex angle σ of 100° and a hemispherical radius r of 200 μm. It is vertically mounted in a dresser fixture 24 on the plane of the grinder worktable 23 .

[0103] The diamond pen grinding wheel dresser 26 has a radial deflection angle α of 40° along the grinding wheel rotation direction, and an axial deflection angle β of 40°. Figure 4 and 5 As shown;

[0104] The grinding wheel dressing parameters set are: grinding machine spindle speed n w The grinding wheel axial dressing feed rate is 3000r / min. f 3mm / min, grinding wheel dressing depth a d 0.5μm, trimming overlap ratio C d is 0.5 and the number of dressing feed cycles k is 9 times, such as Figure 4 and 5 shown.

[0105] The parameters of the nanofluid micro-lubrication mixed liquid supply system 10 are set as follows: the nanofluid micro-lubrication flow rate V is 30 ml / h, and the nanofluid micro-lubrication output air pressure P is 9 bar.

[0106] The geometric parameters of the mixed liquid output nozzle 25 and the bottom tangent plane of the grinding wheel 22 to be dressed are as follows: the vertical distance a is 2 mm, the horizontal distance b is 3 mm, and the angle γ is 25°. Figure 4 and 5 shown.

[0107] After the auxiliary dressing process, the diamond abrasive grains 44 to be dressed are called the dressed diamond abrasive grains 43, and the trimmed profile of the dressed grinding wheel is obtained, and the maximum circular runout E o 45μm, roundness error E r It is 95μm.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A nanofluid micro-lubrication assisted grinding wheel dressing device, characterized in that: include: Nanofluid micro-lubrication mixed liquid supply system can automatically mix nanoparticles and micro-lubrication base liquid into nanofluid micro-lubrication mixed liquid according to proportion; The grinding machine tool comprises a grinding table, a grinding spindle and a mixed liquid output nozzle. The movement direction of the grinding table is perpendicular to the rotation axis of the grinding spindle. The grinding table is provided with a diamond pen grinding wheel dresser and moves with it. The grinding spindle is placed with a grinding wheel to be dressed. The mixed liquid output nozzle is connected to the nanofluid micro-lubrication mixed liquid supply system and is aligned with the grinding wheel dressing area.

2. A nanofluid micro-lubrication assisted grinding wheel dressing device according to claim 1, characterized in that: The diamond dressing tip of the diamond pen grinding wheel dresser is hemispherical.

3. The nanofluid micro-lubrication assisted grinding wheel dressing device according to claim 1, characterized in that: The diamond pen grinding wheel dresser can be deflected to set angles in radial and axial directions.

4. The nanofluid micro-lubrication assisted grinding wheel dressing device according to claim 1, characterized in that: The mixed liquid output nozzle is provided with an atomization cone angle.

5. A nanofluid micro-lubrication assisted grinding wheel dressing method, using the nanofluid micro-lubrication assisted grinding wheel dressing device as described in any one of claims 1 to 4, characterized in that: The following steps are involved: The nanoparticles and the micro-lubricating base fluid are input into an ultrasonic vibration stirrer in a certain proportion and mixed to obtain a nanofluid mixed liquid; The grinding wheel to be dressed is mounted and fixed on the main shaft of the grinding machine, and the diamond pen grinding wheel dresser is vertically mounted in the dresser fixture on the grinding machine. The diamond pen grinding wheel dresser is deflected by a set angle in the radial direction along the rotation direction of the grinding wheel and by a set angle in the axial direction; Setting grinding wheel dressing parameters, nanofluid micro-lubrication mixed liquid supply system parameters, and geometric parameters of the mixed liquid output nozzle and the bottom cutting plane of the grinding wheel to be dressed; starting the machine to perform nanofluid micro-lubrication assisted dressing processing on the grinding wheel to be dressed; Stop the machine, remove the diamond pen grinding wheel dresser from the diamond pen grinding wheel dresser fixture, and return it to the warehouse.

6. A nanofluid minimal lubrication assisted grinding wheel dressing method according to claim 5, characterized in that: The nanoparticles are silicon dioxide, silicon carbide, and graphite, and the minimal lubrication base fluid is peanut oil, soybean oil, palm oil, olive oil, and coconut oil.

7. A nanofluid minimal lubrication assisted grinding wheel dressing method according to claim 5, characterized in that: The diamond pen grinding wheel dresser has a radial deflection setting angle of 3° to 140° along the grinding wheel rotation direction, and an axial deflection setting angle of -65° to 65°.

8. The nanofluid minimal lubrication assisted grinding wheel dressing method according to claim 5, characterized in that: Grinding wheel dressing parameters include grinder spindle speed n w , Grinding wheel axial dressing feed rate v f , grinding wheel dressing depth a d , trimming overlap ratio c d and the number of dressing feed cycles k; the parameters of the nanofluid micro-lubrication mixed liquid supply system include the nanofluid micro-lubrication flow rate V and the nanofluid micro-lubrication output air pressure P; the geometric parameters of the mixed liquid output nozzle and the tangent plane at the bottom of the grinding wheel to be dressed include the vertical distance a, the horizontal distance b and the angle γ.

9. A nanofluid minimal lubrication assisted grinding wheel dressing method according to claim 8, characterized in that: The calculation formula of the angle γ is: When C d ≥1, When C d When ≤1, Where: C d is the trimming overlap ratio, e d is the effective dressing width of the diamond wheel dresser, f d is the dressing lead, r is the radius of the hemispherical diamond dressing tip, and θ is the atomization cone angle of the mixed liquid output nozzle.

10. The nanofluid minimal lubrication assisted grinding wheel dressing method according to claim 5, characterized in that: The nanofluid micro-lubricant mixture needs to be subjected to ultrasonic vibration to make it evenly mixed. The parameters of the ultrasonic vibration are the ultrasonic vibration frequency H and the ultrasonic vibration time T.

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