Friction pair accessory for testing lubricating property of water-based metal working fluid

Abstract

The utility model relates to a friction pair accessory for testing the lubrication performance of water-based metal working fluid, which comprises a groove test disc, a test ball and a tin foil paper tray, the friction pair accessory is arranged in an SRV test cavity, the SRV test cavity comprises a base, a test disc placing platform, a groove test disc clamp, a loading rod and a reciprocating vibration driving rod, the groove test disc clamp is mounted on the base, the groove test disc is placed on the tin foil tray, the tin foil tray is placed on the test disc placement platform, the groove test disc is mounted on the test disc clamp, the test ball is in contact with the circle center of the groove test disc, and a groove is formed in the circle center of the groove test disc. The utility model belongs to the technical field of water-based metal working fluid lubricating performance testing, and can overcome the defect that a stable water-based test lubricating layer cannot be formed in the prior art by using the friction pair accessory, effectively prevent the water-based metal working fluid from overflowing, improve the test precision and reduce the test error.

Description

Technical Field

[0001] The utility model belongs to the technical field of water-based metalworking fluid lubrication performance testing, in particular to a friction pair accessory for testing the lubrication performance of water-based metalworking fluid. Background Art

[0002] There are many types of metalworking fluids. Based on their composition, they can be broadly categorized into four types: pure oil, emulsified, fully synthetic, and semi-synthetic (microemulsion). The latter three are also commonly referred to as water-based metalworking fluids. Metalworking fluids provide lubrication, cooling, chip removal, and rust prevention for metal cutting, grinding, and forming, thereby achieving excellent surface finish and processing quality, and extending the life of cutting tools and machine tools.

[0003] The lubrication performance of water-based metalworking fluids is a crucial performance characteristic. Currently, the industry primarily uses three types of equipment to test the lubrication performance of water-based metalworking fluids: tapping torque testers, four-ball testers, and Falex testers. Measuring lubricant performance using a high-frequency linear vibration tester (SRV), also known as the SRV method, is also a common method. Developed and manufactured by the German company OPTIMOL, the SRV is a high-frequency reciprocating tester for studying the friction and wear properties of lubricating greases and material coatings. It is widely used in the field of tribology for its ability to achieve point, line, and surface contact modes for friction pairs.

[0004] SRV can test the lubrication performance of greases and lubricants with a certain degree of adhesion, and its test dosage is small and the repeatability is good. However, the SRV friction and wear tester cannot test the lubrication performance of water-based metalworking fluids. When water-based metalworking fluids are dripped onto the SRV standard groove test disc, they will quickly evaporate and / or flow out of the surface of the groove test disc, causing dry grinding of the steel ball and the groove test disc. The water-based metalworking fluid that flows out may also corrode the SRV operating table or damage its circuit. Therefore, the existing SRV tester cannot be used to test the lubrication performance of water-based metalworking fluids. In addition, after the test, the existing SRV tester also needs to use a microscope and / or an optical profilometer (ASTM D 7755) to further test the wear spot diameter or wear volume of the test ball and the groove test disc, and the test operation requirements are relatively high. Utility Model Content

[0005] In order to solve the above-mentioned problem, the utility model provides a friction pair accessory for testing the lubrication performance of a water-based metalworking fluid.

[0006] In order to achieve the above functions, the technical solution adopted by the present invention is as follows: a friction pair accessory for testing the lubrication performance of water-based metalworking fluid, including a groove test disc, a test ball, and a tinfoil tray. The friction pair accessory is placed in an SRV test chamber. The SRV test chamber includes a base, a test disc placement platform, a groove test disc fixture, a loading rod, and a reciprocating vibration drive rod. The groove test disc fixture is installed on the base, the groove test disc is placed on the tinfoil tray, the tinfoil tray is placed on the test disc placement platform, the groove test disc is installed on the test disc fixture, the test ball is arranged in contact with the center of the groove test disc, the groove test disc has a groove at the center, and the groove is a circular groove.

[0007] As a preferred technical solution of the present invention, the groove test disc adopts a metal cylindrical ring block, and the test ball adopts a metal ball.

[0008] As a preferred technical solution of the present invention, the surface roughness of the test ball is 0.020-0.030 μm, and the diameter of the test ball is 10 mm.

[0009] As an optimal technical solution of the present invention, the surface roughness of the groove test disk is 0.46-0.66 μm, the outer diameter of the groove test disk is 23.4 mm, the inner diameter of the groove test disk is 22.8 mm, the thickness of the groove test disk is 7.8 mm, and the groove depth is 3.9 mm.

[0010] As a preferred technical solution of the present invention, the groove test disc and the test ball are both made of 100Cr6 bearing steel.

[0011] As a preferred technical solution of the present invention, the material of the tinfoil tray is selected from YS / T852-2021 or GB / T 3198-2020, its thickness is preferably 0.004-0.200 mm, its inner diameter is preferably 24 mm-26 mm, and its height is preferably 2-3 mm.

[0012] As a preferred technical solution of the present invention, a resistance heater and a piezoelectric device are provided on the base, and the resistance heater and the piezoelectric device are located below the groove test plate fixture.

[0013] Compared with the prior art, the present invention adopts the above structure to achieve the following beneficial effects:

[0014] 1. The groove at the center of the test disc is used to hold water-based metalworking fluid, thereby preventing the water-based metalworking fluid from flowing on the test disc. A stable water-based test lubricating layer is formed at the contact interface between the test ball and the test disc, overcoming the defect of the existing technology that cannot form a stable water-based test lubricating layer.

[0015] 2. The tinfoil tray separates the test plate from the test plate fixture and base below. The tinfoil tray can collect water-based metalworking fluid that leaks out due to careless operation, thereby effectively preventing the overflow of water-based metalworking fluid from corroding or short-circuiting the SRV operating table and its circuits.

[0016] 3. The degree of water evaporation loss caused by frictional heat is used to directly judge the lubrication performance of water-based metalworking fluids, avoiding the use of microscopes or other professional instruments to judge the wear spot diameter or wear volume of the test ball and test disc, simplifying the test operation, improving the test accuracy, and reducing the test error. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the SRV test bench for testing the lubrication performance of friction pair accessories of water-based metalworking fluids proposed in the present invention;

[0018] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0019] Figure 3 This is a structural schematic diagram of a groove test disc and a test ball of a friction pair accessory for testing the lubrication performance of a water-based metalworking fluid proposed by the utility model.

[0020] Among them, 1. test ball, 2. groove test disk, 3. tin foil tray, 4. test disk placement platform, 5. reciprocating vibration drive rod, 6. resistance heater, 7. resistance thermometer, 8. groove test disk fixture, 9. piezoelectric device, 10. base, 11. loading rod. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1-3 As shown, the present invention provides a friction pair accessory for testing the lubrication performance of water-based metalworking fluids, including a test ball 1, a groove test disc 2 and a tin foil tray 3. The SRV test chamber includes a test disc placement platform 4, a reciprocating vibration drive rod 5, a resistance heater 6, a resistance thermometer 7, a groove test disc fixture 8, a piezoelectric device 9, a base 10, and a loading rod 11.

[0024] The groove test disc fixture 8 is installed on the base 10, and the base 10 is provided with a resistance heater 6 and a piezoelectric device 9. The resistance heater 6 and the piezoelectric device 9 are located below the test disc fixture 8; the test ball 1 is set in contact with the center of the groove test disc 2, and the groove test disc 2 is used to hold water-based metalworking fluid, thereby preventing the water-based metalworking fluid from flowing on the test disc.

[0025] like Figure 1-2 As shown, a tinfoil tray 3 is provided on the top side of the test disc fixture 8, and the grooved test disc 2 is located on the tinfoil tray 3. The tinfoil can receive the water-based metalworking fluid that flows out due to careless operation, thereby effectively preventing the water-based metalworking fluid from overflowing and corroding the SRV operating table and its circuit.

[0026] like Figure 1-3 As shown, the groove test disk 2 adopts a metal cylindrical ring block, the test ball 1 adopts a metal ball, the surface roughness of the test ball 1 is 0.020~0.030μm, the diameter of the test ball 1 is 10mm, the surface roughness of the groove test disk 2 is 0.46~0.66μm, the outer diameter of the groove test disk 2 is 23.4mm, the inner diameter of the groove test disk 2 is 22.8mm, the thickness of the groove test disk 2 is 7.8mm, and the groove 9 is 3.9mm deep.

[0027] When in use, use a clamp to pick up the test ball 1 and place it near the inner center of the groove test disc 2. Use a micro syringe to transfer 1 mL of water-based metalworking fluid. Carefully transfer 1 mL of metalworking fluid into the groove of the groove test disc 2. Weigh its mass on a 1 / 10,000 balance to an accuracy of 0.1 mg, recorded as m0. Carefully place the groove test disc 2 containing the test ball 1 and 1 mL of metalworking fluid into the tin foil tray 3. The tin foil tray 3 is located on the test disc placement platform 4 of the SRV test chamber. Referring to NB / SH / T0882, tighten the groove test disc fixture 8. First enter the operating software pre-loading program. The machine will automatically apply a load of 50 N for the running-in test. Then use a torque wrench to tighten the groove test disc fixture 8 to 2.5 N m and enter the software test. Run the preparation program, the machine will automatically heat up, when the test temperature stabilizes, the test machine will automatically start running, the computer will display the operating curve of each parameter, focus on its friction coefficient f, after 30s of running-in, under the conditions of test temperature 50℃, test load 150N, frequency 50Hz, and stroke 0.5mm, after running for 30min, the test machine and software program will automatically stop, and remove the groove test disc 2 and test ball 1 at the same time, be careful to avoid spilling the metalworking fluid in the groove test disc 2, weigh its mass on a 1 / 10,000 balance, accurate to 0.1mg, recorded as m1, the mass difference before and after the metalworking fluid Δm=m0-m1, refer to the above pre-test preparations and test steps, repeat the test again, take the average of the two tests, and the average of the mass difference Average friction coefficient

[0028] In order to verify the feasibility of the utility model, the lubrication performance of three water-based metalworking fluids with different lubrication properties were tested under the same test conditions: temperature 50°C, test time 30 min, frequency 50 Hz, stroke 0.5 mm, load 150 N, and the material of the test disc and test ball were both 100Cr6 bearing steel. After parallel tests, the results are shown in the table below.

[0029]

[0030] From the above results, it can be seen that sample 1 has the best lubrication performance, the smallest mass change, and the smallest friction coefficient; sample 3 has the worst lubrication performance, the largest mass change, and the largest friction coefficient; sample 2 has an intermediate lubrication performance.

[0031] The above test was repeated in other laboratories, and the test results were basically consistent, proving that the utility model can be fully used for testing the lubrication performance of water-based metalworking fluids.

[0032] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A friction pair accessory for testing the lubrication performance of water-based metalworking fluids, characterized by: The invention comprises a groove test disc (2), a test ball (1), and a tinfoil tray (3). The friction pair accessory is placed in an SRV test chamber. The SRV test chamber comprises a base (10), a test disc placement platform (4), a groove test disc fixture (8), a loading rod (11), and a reciprocating vibration drive rod (5). The groove test disc fixture (8) is installed on the base (10). The groove test disc (2) is placed on the tinfoil tray (3). The tinfoil tray (3) is placed on the test disc placement platform (4). The groove test disc (2) is installed on the groove test disc fixture (8). The test ball (1) is arranged in contact with the center of the groove test disc (2). The center of the groove test disc (2) has a groove, and the groove is a circular groove.

2. The friction pair accessory for testing the lubrication performance of water-based metalworking fluid according to claim 1, characterized in that: The groove test disc (2) adopts a metal cylindrical ring block, and the test ball (1) adopts a metal ball.

3. The friction pair accessory for testing the lubrication performance of water-based metalworking fluid according to claim 1, characterized in that: The surface roughness of the test ball (1) is 0.020-0.030 μm, and the diameter of the test ball (1) is 10 mm.

4. The friction pair accessory for testing the lubrication performance of water-based metalworking fluid according to claim 1, characterized in that: The surface roughness of the groove test disc (2) is 0.46-0.66 μm, the outer diameter of the groove test disc (2) is 23.4 mm, the inner diameter of the groove test disc (2) is 22.8 mm, the thickness of the groove test disc (2) is 7.8 mm, and the groove depth is 3.9 mm.

5. The friction pair accessory for testing the lubrication performance of water-based metalworking fluid according to claim 1, characterized in that: The groove test disc (2) and the test ball (1) are both made of 100Cr6 bearing steel.

6. The friction pair accessory for testing the lubrication performance of water-based metalworking fluid according to claim 1, characterized in that: The material of the tinfoil tray (3) is selected from YS / T 852-2021 or GB / T 3198-2020, its thickness is 0.004-0.200 mm, its inner diameter is 24 mm-26 mm, and its height is 2-3 mm.

7. The friction pair accessory for testing the lubrication performance of water-based metalworking fluid according to claim 1, characterized in that: A resistance heater (6) and a piezoelectric device (9) are provided on the base (10), and the resistance heater (6) and the piezoelectric device (9) are located below the groove test disc fixture (8).

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