An experimental device and experimental method for studying wetting characteristics in cutting slits

Abstract

The present invention belongs to the technical field of experimental devices for measuring surface wetting properties, and relates to an experimental device for studying wetting characteristics in a cutting slit, comprising a base, a sliding platform device mounted on the base, a bottom plate, a cover fixedly mounted on the bottom plate and connected to the base via a spring, a glass circle fixing device mounted on the bottom plate, a lifting device mounted on the bottom plate, and a rotating device mounted on the lifting device. The present invention can provide three degrees of freedom of slit motion forms, namely linear contact, relative lifting and relative rotation, and can observe the wetting and spreading behavior of droplets in the slit by regulating the relative motion parameters of the slit and the droplet injection parameters.

Description

Technical Field

[0001] The present invention relates to an experimental device and an experimental method for studying the wetting characteristics in a cutting slit, which is a slit wetting characteristic testing device for a tool-chip interface in a simulated cutting process under different motion states, and provides an observation test instrument for studying the micro-lubrication mechanism in a relative motion slit such as a friction pair or a cutting interface. The device principle is simple and easy to understand, and has strong practicality. It belongs to the field of experimental devices for measuring surface wetting properties. Background Art

[0002] Wetting properties are an important surface property of solid materials. How to make good use of the wetting properties of solid materials has become a concern. Due to its broad application prospects and the gradual maturity of surface material processing technology at this stage, the study of wetting properties has attracted widespread attention and research.

[0003] In the current research, publication number CN111579436A discloses a method and device for detecting the dynamic wetting characteristics of droplets on the workpiece contact surface. Publication number CN105177503A discloses a method for improving the wetting characteristics of the surface of a slit coating mold, which is used to solve the problem that the traditional grinding and polishing process in the manufacturing process of the existing slit coating mold has no significant effect on increasing wettability. Publication number CN110736681A discloses a method and device for detecting the evolution of droplet behavior between multi-angle slits under temperature control conditions. The temperature control module can realize the evolution characteristics of the droplet state behavior without passing the temperature, and the slit spacing adjustment can realize the evolution characteristics of the droplet behavior in the flat plate and slit states.

[0004] It can be seen from the above publication numbers that, in current research, there is relatively little research on the wetting characteristics mechanism of droplets in dynamic slits, and there is a lack of relevant experimental equipment and experimental methods. Summary of the invention

[0005] The present invention proposes an experimental device and an experimental method for studying the wetting characteristics in a cutting slit. The wetting and spreading behavior of the droplets in the slit can be observed by adjusting the relative motion parameters of the slit and the droplet injection parameters. The device is an experimental device that can provide three degrees of freedom of slit motion forms such as linear contact, relative lifting and relative rotation. It is an experimental device that can adjust parameters such as linear contact time, relative lifting speed and relative motion speed. It is an experimental device that can realize the injection of droplets before contact (before lifting and rotation), during contact (during lifting and rotation) or after contact (after lifting and rotation), and then observe the dynamic evolution of parameters such as the spreading area, moving vector distance and liquid surface angle of the droplets in the slit under different linear motion states. To achieve the above purpose, the technical solution of the present invention is:

[0006] An experimental device for studying wetting characteristics in cutting slits.

[0007] An experimental device for studying wetting characteristics in a cutting slit, comprising a base, a sliding platform device mounted on the base, a bottom plate, a cover fixedly mounted on the bottom plate and connected to the base via a spring, a glass circle fixing device mounted on the bottom plate, a lifting device mounted on the bottom plate, and a rotating device mounted on the lifting device;

[0008] The rotating device is provided with a nozzle support and a nozzle;

[0009] The sliding platform device includes a sliding platform base, a first motor installed on the side of the sliding platform base, a first coupling connected to the first motor, a screw connected to the coupling, a sliding platform mounted on the sliding platform base and movable left and right relative to the screw, and a tool mounting platform and a metal sheet installed on the sliding platform;

[0010] The rotating device includes a hollow rotating platform, a second motor meshing with the hollow rotating platform and driving the hollow rotating platform to rotate, and a rotating tool mounting platform mounted on the hollow rotating platform;

[0011] The lifting device includes a motor support, a third motor mounted on the motor support, a worm gear reducer connected to the third motor via a second coupling, a lifting screw connected to the worm gear reducer, a lifting platform and a lifting nut mounted on the lifting screw;

[0012] The glass circle fixing device comprises a mounting frame, a fixing shaft fixedly connected to the mounting frame, and a glass circle mounting shaft connected to the fixing shaft and used for mounting the glass circle.

[0013] Double slide rails are installed on both sides of the screw rod, and the slide table is installed with a slider that cooperates with the slide rails to form a sliding pair through bolts. A screw nut is installed between the slide table and the screw rod, and a bearing is provided between the screw nut and the slide table 108 to form an interference fit.

[0014] A rotating ring is installed on the hollow rotating platform, and the rotating ring is connected to the rotating tool mounting platform. A position sensor is also installed on the side of the hollow rotating platform, and the rotating device also includes a platform shell.

[0015] The worm gear reducer includes a worm gear reducer housing and a worm gear connected to the third motor.

[0016] The glass circle installation shaft is connected to the fixed shaft through a fixing bolt.

[0017] An experimental method for an experimental device for studying wetting characteristics in a cutting slit comprises the following steps:

[0018] Step 1: Installation and adjustment:

[0019] S1: Adjust the horizontal state of the device: Place the experimental device so that the device is in a horizontal state;

[0020] S2: Adjust the position of the device so that the sliding platform in the sliding platform device is placed away from the glass circle, and the lifting platform moves to the lowest end;

[0021] S3: Adjust the position of the glass circle so that the glass circle can be closely attached to the metal sheet, and the metal sheet and the glass circle are attached;

[0022] S4: Adjust the spray center line and the metal sheet plane so that the spray direction of the droplet nozzle is aligned with the center point of the slit arc;

[0023] S5: Adjust the position of the linear slide during linear motion, so that the metal sheet and the glass circle are just in close contact with each other and the push rod on the linear slide can just push the shell to prevent the glass circle from being broken by excessive force;

[0024] S6: During the rotational motion, the linear slide is withdrawn to the farthest end from the glass circle, the nozzle is mounted on the mounting frame, and the position of the nozzle is adjusted so that when the position sensor senses, the nozzle is just aligned with the center point of the slit arc and sprays droplets;

[0025] S7: During the lifting movement, install the nozzle on the rotating platform and adjust the nozzle position so that the nozzle is aligned with the center point of the arc;

[0026] S8: Adjust the ultra-depth-of-field microscope so that it can observe the wetting phenomenon of clear droplets during the movement of the metal tool.

[0027] Step 2: Parameter setting:

[0028] S11: The speed of the metal sheet in linear motion is set by the motor, and the motion state of the metal sheet is controlled by three parameters: horizontal linear motion speed, horizontal circular motion speed, and vertical lifting motion speed. Different speed gradients are selected from the three motions to observe the wetting conditions of the droplets under different motion states;

[0029] S12: In the process of controlling the three motion parameters, metal sheets with arcs of different radii can be selected according to the fitting position of the metal sheet and the glass circle. According to the experimental results, it can be determined whether the droplet spreading path is related to the radius of the arc-shaped slit;

[0030] S13: Control the droplet nozzle to spray atomized droplets into the arc-shaped slit, record the change of the spreading area of ​​the droplets and the metal sheet in the slit over time through the super-depth of field microscope, and feed back the dynamic change of the data to the PC through the super-depth of field microscope data acquisition.

[0031] Step 3: Analysis and evaluation:

[0032] S21: After fixing the glass circle, set the movement speed of the microstructured metal sheet and observe the change law of the spreading path of the trace droplet in the moving slit;

[0033] S22: After changing the linear motion speed of the metal sheet, the above process is repeated to achieve the characterization of the penetration performance of the droplet in the moving slit. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a structural schematic diagram of the sliding platform device in the present invention;

[0037] Figure 3 It is a structural schematic diagram of the rotating device in the present invention;

[0038] Figure 4 It is a structural schematic diagram of the lifting device in the present invention;

[0039] Figure 5 It is a structural schematic diagram of the glass circle fixing device in the present invention;

[0040] Figure 6 Schematic diagram of the vertical distance from the contact arc line on the metal sheet to the arc with the maximum radius on the cone surface.

[0041] In the figure: 1-sliding platform device, 2-base, 3-cover, 4-bottom plate, 5-rotating device, 6-lifting device, 7-glass circle fixing device, 8-sprinkler bracket, 9-sprinkler, 101-first motor, 102-slide base, 103-slide rail, 104-slider, 105-screw, 106-metal sheet, 107-tool installation platform, 108-slide, 109-first coupling, 501-hollow rotating platform, 502-platform outer Shell, 503-second motor, 504-position sensor, 505-rotating tool mounting platform, 506-rotating ring, 601-lifting platform, 602-worm gear reducer housing, 603-worm gear, 604-motor support, 605-third motor, 606-second coupling, 607-lifting nut, 608-lifting screw, 701-fixed shaft, 702-mounting frame, 703-glass circle mounting shaft, 704-fixing bolt. DETAILED DESCRIPTION

[0042] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] like Figure 1 As shown, the present invention designs an experimental device for studying the wetting characteristics in cutting slits, and the device is mainly composed of a sliding platform device 1, a rotating device 5, a lifting device 6, a glass circle fixing device 7, a cover 3, a base 2, a bottom plate 4, a nozzle bracket 8 and a nozzle. The sliding platform device 1 is mounted on the base 2 by bolts, and the cover 3 is mounted on the bottom plate 4 and fixed by screws. The cover 3 and the base 2 are connected by two springs, so that when the tool makes a linear motion to cut the glass circle, the glass circle can make a linear motion together. The glass circle fixing device 7 is fixed to the bottom plate 4 by bolts and reinforced by screws. The lifting device 6 is also fixed to the bottom plate 4 by bolts, and the rotating device 5 is mounted on the lifting device and can make a lifting motion.

[0044] like Figure 2As shown, the sliding platform device comprises a first motor 101, a slide base 102, a slide rail 103, a slider 104, a first coupling 109, a lead screw 105, a tool mounting platform 107, a metal sheet 106, a coupling 109 and a slide 108. The first motor 101 is fixed to the side of the slide base 102 by bolts, the lead screw 105 is fixed in the middle of the slide base 102 to form a clearance fit, and the lead screw 105 is connected to the first motor 101 through the first coupling 109, so that the lead screw 105 rotates with the first motor 101. The double slide rails 103 are fixed to both sides of the lead screw 105, the two sliders 104 and the double slide rails 103 form a sliding pair, and the slide 108 is fixed to the two sliders 104 by bolts, a lead screw nut is installed between the slide 108 and the lead screw 105, and a bearing is provided between the lead screw nut and the slide 108 to form an interference fit. The tool installation platform 107 is fixed on the slide 108 by bolts, and the tool installation platform 107 is installed with a metal sheet 106. There are push rods for pushing the housing on both sides of the slide.

[0045] like Figure 3 As shown, the rotating device is composed of a hollow rotating platform 501, a second motor 503, a platform housing 502, a position sensor 504, a rotating ring 506, and a rotating tool mounting platform 505. The motor 503 is on the side of the rotating platform 501 and is vertically fixed by bolts. The second motor 503 is meshed with the gear inside the hollow rotating platform 501. The rotating tool mounting platform 505 is installed on the hollow rotating platform 501 and is tightly fixed on the central control rotating platform 501 by bolts, so that the rotating tool mounting platform 504 rotates with the hollow rotating platform 501.

[0046] like Figure 4 As shown, the lifting device is composed of a third motor 605, a motor support 604, a second coupling 606, a lifting nut 607, a lifting platform 601, a worm gear 603, a lifting screw 608, and a worm gear reducer housing 602. The third motor 605 is fixed to the motor support 604 by bolts, the third motor 605 and the worm gear 603 are connected by the second coupling 606, the worm gear 603 is installed inside the worm gear reducer housing 602, the worm gear and the screw 608 form a high-strength hinge, and the lower part of the lifting screw 608 is equipped with a bearing, and the bearing and the lifting screw 608, the bearing and the worm gear reducer housing 602 are all interference fit. The lifting nut 607 is matched with the lifting screw 608 through threads, and the lifting nut 607 can perform lifting movements on the lifting screw 608, and the lifting platform 601 is matched with the lifting nut 607 through bearings, wherein the bearing and the lifting platform 601, the bearing and the lifting nut 607 are both interference fits, and four positioning rods are installed around the lifting platform 601 to limit the rotation of the lifting platform 601.

[0047] like Figure 5 As shown, the glass circle fixing device is composed of a glass circle mounting shaft 703, a fixing bolt 704, a mounting frame 702 and a fixing shaft 701. The glass circle is mounted on the glass circle mounting shaft, the glass circle mounting shaft 703 is fixed to the fixing shaft 701 by the fixing bolt 704, and the fixing shaft 701 is tightly fixed to the mounting frame 702 by bolts, and the mounting frame 702 is fixed to the bottom plate 4 and moves linearly with the bottom plate 4.

[0048] The pitch of the above-mentioned slide screw and screw nut is P=5mm, and the tooth thickness is 1mm. The pitch of the lifting screw and lifting nut is P=7.6mm, and the tooth thickness is 2.9mm.

[0049] The travel of the lead screw nut and the lead screw in the sliding platform device satisfies:

[0050] L = nPt (where n is the screw speed, t is the unit time, and P is the screw pitch of the slide)

[0051] The range of L is: 0~325mm

[0052] Similarly, the lifting height of the lifting screw and the lifting platform in the lifting device meets the following requirements:

[0053] H = mPt (P is the pitch of the lifting screw and m is the speed of the lifting screw)

[0054] The range of H is: 0~70mm

[0055] The transmission ratio of the worm gear is i=Z2:Z1=44:1 (Z2 is the number of turbine teeth, Z1 is the number of worm heads)

[0056] The hollow rotating platform can use the DG200 rotating platform, whose reduction ratio is: 1 / 18. The speed of the rotating platform's circular motion can be adjusted according to the speed of its motor. The ratio between the motor and the rotating platform is: nt / 18 (n is the motor speed, t is the unit time).

[0057] like Figure 6 This is a schematic diagram of the glass circle. The size of the cylindrical part is R=29.9mm, and the relationship between the radius of the contact arc between its conical surface and the metal blade is: R=70-h*cos45° (where 70 is the maximum radius on the conical surface of the glass circle, and h is the vertical distance from the contact arc line on the metal sheet to the arc with the maximum radius on the conical surface, and the range of h is 0-40mm). The metal blade is made into a series of blades with different radii so that the blade can fit the glass circle on the conical surface.

[0058] The present invention studies the influence mechanism of fluid infiltration and interface friction through experiments, simulates the dynamic contact of tool-chip interface in the slit through the device, observes and analyzes the wetting characteristics of droplets, and proposes an experimental method for analyzing and evaluating the wetting characteristics in combination with experimental parameters.

[0059] The present invention studies the influence of the slit on the wetting characteristics of the droplet under different motion states by controlling and changing the motion state parameters of the slit simulating the knife-cut interface. The specific implementation scheme is as follows:

[0060] 1. Specific operation of the effect of the change of motion parameters between the tool-chip interface gap on the wetting characteristics

[0061] Step 1: Installation and adjustment:

[0062] 1. Adjust the horizontal state of the device: Place the experimental device so that it is in a horizontal state.

[0063] 2. Adjust the position of the device so that the sliding platform in the sliding platform device is placed away from the glass circle, and its movement range is 0 to 325 mm. Move the lifting platform to the bottom, and the lifting platform movement range is 0 to 70 mm. The movement range of the rotating platform is the entire circumference.

[0064] 3. Adjust the position of the glass circle so that the glass circle fits tightly against the metal sheet and the metal sheet fits tightly against the glass circle.

[0065] 4. Adjust the spray center line and the metal plate plane so that the spray direction of the droplet nozzle is aligned with the center point of the slit arc.

[0066] 5. During linear motion, adjust the position of the linear slide so that the metal sheet and the glass circle are just in close contact and the push rod on the linear slide can just push the outer shell to prevent the glass circle from being broken by excessive force.

[0067] 6. During the rotational motion, withdraw the linear slide to the farthest end from the glass circle, install the nozzle on the mounting bracket, and adjust the position of the nozzle so that when the position sensor senses, the nozzle is just aligned with the center point of the slit arc and sprays droplets.

[0068] 7. During the lifting movement, install the nozzle on the rotating platform and adjust the position of the nozzle so that it is aligned with the center point of the arc.

[0069] 8. Adjust the ultra-depth-of-field microscope so that it can observe the wetting phenomenon of clear droplets during the movement of the metal tool.

[0070] Step 2: Parameter setting

[0071] The speed of the metal sheet in linear motion is set by the motor, and the motion state of the metal sheet is controlled by three parameters: horizontal linear motion speed, horizontal circular motion speed, and vertical lifting motion speed. Different speed gradients are selected from the three motions to observe the wetting conditions of the droplets under different motion states.

[0072] In the process of controlling the three motion parameters, metal sheets with arcs of different radii can be selected according to the fitting position of the metal sheet and the glass circle. Based on the experimental results, it can be determined whether the droplet spreading path is related to the radius of the arc-shaped slit.

[0073] 3. Control the droplet nozzle to spray atomized droplets into the arc-shaped slit, and use the super-depth-of-field microscope to record the changes in the spread area of ​​the droplets and the metal sheet in the slit over time. The dynamic changes of the data are fed back to the PC through the super-depth-of-field microscope data collection.

[0074] Step 3: Analysis and Evaluation

[0075] After fixing the glass circle, set the movement speed of the microstructured metal sheet and observe the changing law of the spreading path of the trace droplet in the moving slit; (mainly collect the spreading boundary lines at different time points, find the shortest and longest sides of the area enclosed by the boundary lines, and then find the angle between the longest side and the moving direction; the optimal microstructure should be the one with the largest ratio of the length of the longest side to the length of the shortest end, and the smallest angle between the long side and the moving direction)

[0076] After changing the linear motion speed of the metal sheet, the above process is repeated to achieve the characterization of the penetration performance of the droplet in the moving slit.

[0077] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. An experimental device for studying wetting characteristics in a cutting slit, characterized in that: It includes a base, a sliding platform device installed on the base, a bottom plate, a cover fixedly installed on the bottom plate and connected to the base through a spring, a glass circle fixing device mounted on the bottom plate, a lifting device installed on the bottom plate, and a rotating device installed on the lifting device; The rotating device is provided with a nozzle support and a nozzle; The sliding platform device includes a sliding platform base, a first motor installed on the side of the sliding platform base, a first coupling connected to the first motor, a screw connected to the coupling, a sliding platform mounted on the sliding platform base and movable left and right relative to the screw, and a tool mounting platform and a metal sheet installed on the sliding platform; The rotating device includes a hollow rotating platform, a second motor meshing with the hollow rotating platform and driving the hollow rotating platform to rotate, and a rotating tool mounting platform mounted on the hollow rotating platform; The lifting device includes a motor support, a third motor mounted on the motor support, a worm gear reducer connected to the third motor via a second coupling, a lifting screw connected to the worm gear reducer, a lifting platform and a lifting nut mounted on the lifting screw; The glass circle fixing device comprises a mounting frame, a fixing shaft fixedly connected to the mounting frame, and a glass circle mounting shaft connected to the fixing shaft and used for mounting the glass circle.

2. The experimental device for studying wetting characteristics in a cutting slit according to claim 1, characterized in that: Double slide rails are installed on both sides of the screw rod, and the slide table is installed with a slider that cooperates with the slide rails to form a sliding pair through bolts. A screw nut is installed between the slide table and the screw rod, and a bearing is provided between the screw nut and the slide table 108 to form an interference fit.

3. An experimental device for studying wetting characteristics in a cutting slit according to claim 1 or 2, characterized in that: A rotating ring is installed on the hollow rotating platform, and the rotating ring is connected to the rotating tool mounting platform. A position sensor is also installed on the side of the hollow rotating platform, and the rotating device also includes a platform shell.

4. An experimental device for studying wetting characteristics in a cutting slit according to claim 1 or 2, characterized in that: The worm gear reducer includes a worm gear reducer housing and a worm gear connected to the third motor.

5. The experimental device for studying wetting characteristics in a cutting slit according to claim 1, characterized in that: The glass circle installation shaft is connected to the fixed shaft through a fixing bolt.

6. An experimental method based on an experimental device for studying wetting characteristics in a cutting slit according to any one of claims 1 to 5, characterized in that: The specific steps include: Step 1: Installation and adjustment: S1: Adjust the horizontal state of the device: Place the experimental device so that the device is in a horizontal state; S2: Adjust the position of the device so that the sliding platform in the sliding platform device is placed away from the glass circle, and the lifting platform moves to the lowest end; S3: Adjust the position of the glass circle so that the glass circle can be closely attached to the metal sheet, and the metal sheet and the glass circle are attached; S4: Adjust the spray center line and the metal sheet plane so that the spray direction of the droplet nozzle is aligned with the center point of the slit arc; S5: Adjust the position of the linear slide during linear motion, so that the push rod on the linear slide can push the shell just when the metal sheet and the glass circle are just in close contact, to prevent the glass circle from being broken by excessive force; S6: During the rotational motion, the linear slide is withdrawn to the farthest end from the glass circle, the nozzle is mounted on the mounting frame, and the position of the nozzle is adjusted so that when the position sensor senses, the nozzle is just aligned with the center point of the slit arc and sprays droplets; S7: During the lifting movement, install the nozzle on the rotating platform and adjust the nozzle position so that the nozzle is aligned with the center point of the arc; S8: Adjust the ultra-depth-of-field microscope so that it can observe the wetting phenomenon of clear droplets during the movement of the metal tool.

7. The experimental method of the experimental device for studying wetting characteristics in cutting slits according to claim 6, characterized in that: It also includes step 2: parameter setting: S11: The speed of the metal sheet during linear motion is set by the motor, and the motion state of the metal sheet is controlled by three parameters: horizontal linear motion speed, horizontal circular motion speed, and vertical lifting motion speed. Different speed gradients are selected from the three motions to observe the wetting conditions of the droplets under different motion states; S12: In the process of controlling the three motion parameters, metal sheets with arcs of different radii can be selected according to the fitting position of the metal sheet and the glass circle. According to the experimental results, it can be determined whether the droplet spreading path is related to the radius of the arc-shaped slit; S13: Control the droplet nozzle to spray atomized droplets into the arc-shaped slit, record the change of the spreading area of ​​the droplets and the metal sheet in the slit over time through the super-depth of field microscope, and feed back the dynamic change of the data to the PC through the super-depth of field microscope data acquisition.

8. The experimental method of the experimental device for studying wetting characteristics in cutting slits according to claim 7, characterized in that: It also includes step three: analysis and evaluation: S21: After fixing the glass circle, set the movement speed of the microstructured metal sheet and observe the change law of the spreading path of the trace droplet in the moving slit; S22: After changing the linear motion speed of the metal sheet, the above process is repeated to achieve the characterization of the penetration performance of the droplet in the moving slit.

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