Thrust sliding bearing alloy vibration casting device and casting method

Abstract

The present invention discloses a thrust sliding bearing alloy vibration pouring device, comprising a pouring base, a plurality of columns evenly arranged on the pouring base, an upper support plate mounted on the columns, an excitation motor arranged at the edge of the upper support plate, a plurality of pressure plates arranged on the upper support plate, the plurality of pressure plates forming a circle corresponding to the shape of the thrust sliding bearing matrix to be poured with the alloy, a water storage enclosure arranged on the periphery of the pressure plate, and a water cooling structure arranged on the upper support plate. The present invention also discloses a method for alloy pouring on a thrust sliding bearing using the above pouring device. Using the device of the present invention to pour tin-based alloy on a thrust sliding bearing can timely remove gas and impurities in the alloy during pouring, and plays a role in refining the grains during the solidification process of the alloy.

Description

Technical Field

[0001] The present invention belongs to the technical field of bimetal composites of thrust sliding bearings, and relates to a vibration casting device for a thrust sliding bearing alloy. The present invention also relates to a method for casting alloy for a thrust sliding bearing using the casting device. Background Art

[0002] Sliding bearings often bear impact loads, requiring bearing alloys to exhibit excellent friction characteristics, high impact resistance, and high fatigue strength under repeated loads. Thrust sliding bearings typically use tin-based alloys for composite casting, which presents two challenges: First, impurities and pores generated during the alloy casting process can only be discharged through self-floating, which can be difficult to exhaust due to low casting temperatures and insufficient buoyancy, resulting in pores and inclusions after solidification. Second, primary phases during solidification tend to segregate and connect into sheets, resulting in coarse and uneven microstructures. These two issues affect the mechanical and frictional properties of the tin-based alloy used in thrust sliding bearings. Summary of the Invention

[0003] The purpose of the present invention is to provide a thrust sliding bearing alloy vibration casting device, which can solve the degassing and impurity removal problems during the casting process by casting alloy for thrust sliding bearings, and has the effect of refining grains in the liquidus to solidus stage.

[0004] Another object of the present invention is to provide a vibration casting method for thrust sliding bearing alloy.

[0005] The technical solution adopted in the present invention is:

[0006] The thrust sliding bearing alloy vibration pouring device includes a pouring base, a plurality of columns are evenly arranged on the pouring base, an upper support plate is mounted on the columns, an excitation motor is arranged on the edge of the upper support plate, and a plurality of pressure plates are arranged on the upper support plate. The plurality of pressure plates form a circle corresponding to the shape of the thrust sliding bearing matrix of the alloy to be poured, a water storage enclosure is arranged on the periphery of the pressure plate, and a water cooling structure is also arranged on the upper support plate.

[0007] The present invention is also characterized in that:

[0008] The upper support plate is provided with a positioning hole, and the positioning hole is in clearance with the column.

[0009] A damping spring is arranged on the inner side of the column, and the upper part of the damping spring contacts the upper supporting plate.

[0010] The bottom of the pressure plate is fixed to the upper support plate by long screws.

[0011] A plurality of short screws are arranged on the upper supporting plate at a position located within a circle surrounded by the plurality of pressing plates.

[0012] A water outlet enclosure is provided on the upper support plate at a position located outside the water storage enclosure, and the cross sections of the water storage enclosure and the water outlet enclosure are both circular.

[0013] The water cooling structure includes a water inlet and several water outlets. The water inlet is arranged in the circle surrounded by the pressure plate, and the water outlet is arranged between the water storage enclosure and the water outlet enclosure. The water inlet and the water outlet both pass through the upper support plate.

[0014] Another technical solution adopted by the present invention is:

[0015] The thrust sliding bearing alloy vibration casting method specifically includes the following steps:

[0016] Step 1: Unscrew the long screws, remove the pressure plate on the upper support plate, place the thrust sliding bearing matrix of the alloy to be cast on the short screws, and then tighten the long screws;

[0017] Step 2: injecting a tin-based alloy into the upper surface of the thrust sliding bearing substrate at a temperature of 30°C to 100°C above the liquidus;

[0018] Step 3: Immediately after the injection is completed, start the vibration motor, the vibration frequency is ≥8000 times / minute, and the vibration direction is horizontal;

[0019] Step 4: 0.5 to 1 minute after the start of vibration, turn on the cooling water to cool the bottom of the thrust sliding bearing base;

[0020] Step 5: When the temperature of the tin-based alloy drops to 80°C to 100°C below the liquidus, turn off the excitation motor; when the temperature of the tin-based alloy drops to 110°C to 150°C, turn off the cooling water;

[0021] Step 6. Unscrew the long screws, remove the four pressure plates on the upper support plate, take out the thrust sliding bearing base, and the casting is completed.

[0022] Another technical solution of the present invention is also characterized in that:

[0023] The upper support plate is provided with a positioning hole, which is clearance-matched with the column. A damping spring is provided on the inner side of the column, and the upper part of the damping spring contacts the upper support plate.

[0024] A water outlet enclosure is installed on the upper support plate, located outside the water storage enclosure. Both the water storage enclosure and the water outlet enclosure have circular cross-sections. The water cooling structure includes a water inlet and several water outlets. The water inlet is located within the circle formed by the pressure plate, and the water outlet is located between the water storage enclosure and the water outlet enclosure. Both the water inlet and the water outlet extend through the upper support plate.

[0025] The beneficial effects of the present invention are:

[0026] The pouring device of the present invention is provided with an excitation motor. During the pouring process of the tin-based alloy, the excitation motor will cause the tin-based alloy liquid to vibrate at a high frequency, which can increase the thermal convection and thermal motion of molecules when the alloy liquid temperature is above the liquidus during the pouring process, thereby timely and maximally removing the gas and impurities in the alloy liquid; in the liquidus to solidus stage, the high-frequency vibration can continuously cause the newly grown crystal dendrites to be cut off under the vibration, thereby playing a role in refining the grains. The design of the water-cooling structure in the device of the present invention only water-cools the bottom of the thrust sliding bearing, and can ensure that the entire surface of the bottom of the thrust sliding bearing base is in contact with water and cooled evenly. Water cooling can also make the alloy liquid cool quickly and solidify sequentially, preventing the alloy grains from growing rapidly. Using the device of the present invention to pour tin-based alloys can improve the mechanical properties and friction characteristics of the thrust sliding bearing tin-based alloy after solidification. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of the pouring device of the present invention;

[0028] Figure 2 It is a top view of the pouring device of the present invention.

[0029] In the figure, 1. casting base, 2. upper support plate, 3. water inlet, 4. water outlet, 5. damping spring, 6. water storage enclosure, 7. water outlet enclosure, 8. short screw, 9. thrust sliding bearing base, 10. tin-based alloy, 11. excitation motor, 12. cooling water, 13. long screw, 14. column, 15. positioning hole, 16. pressure plate. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The thrust sliding bearing alloy vibration casting device of the present invention has a structure as follows Figure 1 and Figure 2 As shown, it includes a casting base 1, and a number of columns 14 are evenly arranged on the casting base 1. In this embodiment, four columns 14 are arranged, and the four columns 14 are evenly distributed at the upper edge of the casting base 1. A damping spring 5 is fixed to the inner side of each column 14. An upper support plate 2 is mounted on the four columns 14, and four positioning holes 15 are provided on the upper support plate 2. The positioning holes 15 are clearance-matched with the columns 14, thereby connecting the upper support plate 2 and the columns 14. The lower part of the upper support plate 2 is in contact with the damping spring 5. An excitation motor 11 is provided at the upper edge of the upper support plate 2. When the excitation motor 11 is started, under the action of the damping spring 5, the upper support plate 2 can vibrate at a uniform speed at a certain frequency.

[0032] A plurality of pressure plates 16 are provided at the center of the upper support plate 2. In this embodiment, four pressure plates 16 are provided. The four pressure plates 16 form a circle corresponding to the shape of the thrust sliding bearing base 9 of the alloy to be cast. The bottom of the pressure plate 16 is fixed to the upper support plate 2 by a long screw 13. A plurality of short screws 8 are provided on the upper support plate 2 within the circle formed by the pressure plate 16. In this embodiment, the number of short screws 8 is four.

[0033] A water storage enclosure 6 is provided on the upper support plate 2 at the periphery of the pressure plate 16, and a water outlet enclosure 7 is provided on the upper support plate 2 at the periphery of the water storage enclosure 6. The cross sections of the water storage enclosure 6 and the water outlet enclosure 7 are both annular.

[0034] The pouring device of the present invention is also equipped with a water-cooling structure for cooling the bottom of the thrust sliding bearing. The water-cooling structure includes a water inlet 3 and a plurality of water outlets 4. The water inlet 3 is arranged on the upper support plate 2 within the circle formed by the pressure plate 16, and the water outlets 4 are arranged on the upper support plate 2 between the water storage enclosure 6 and the water outlet enclosure 7. The water inlet 3 and the water outlet 4 both penetrate the upper support plate 2. In this embodiment, one water inlet 3 and ten water outlets 4 are provided.

[0035] The specific process of alloy casting for thrust sliding bearings using the device of the present invention is as follows:

[0036] Step 1. Unscrew the long screws 13, remove the four pressing plates 16 on the upper support plate 2, and place the thrust sliding bearing base 9 to be cast on the short screws 8. The four short screws 8 are used to support the thrust sliding bearing base 9 so that the bottom surface of the thrust sliding bearing base 9 can contact the cooling water 12. Then tighten the long screws 13 and fix the thrust sliding bearing base 9 on the upper support plate 2 with four pressing plates 16 to prevent the thrust sliding bearing base 9 from jumping. The upper surface of the thrust sliding bearing base 9 is to be cast with the tin-based alloy 10;

[0037] Step 2: injecting the tin-based alloy 10 into the upper surface of the thrust sliding bearing substrate 9 at a temperature of 30° C. to 100° C. above the liquidus;

[0038] Step 3. Immediately after the injection is completed, start the vibration motor 11, with the vibration frequency ≥8000 times / minute, and the vibration direction is horizontal. Under the action of the vibration motor 11 and the damping spring 5, the thrust sliding bearing base 9 and the upper support plate 2 vibrate relative to the casting base 1, and drive the tin-based alloy 10 to vibrate at high frequency, thereby increasing the thermal convection and thermal motion of molecules when the alloy liquid temperature is above the liquidus during the casting process, thereby timely and maximally removing the gas and impurities in the alloy. In the liquidus to solidus stage, the high-frequency vibration of the tin-based alloy 10 can make the chemical composition and temperature of the alloy liquid uniform, weaken the conditions for the formation of dendrites, and continuously cut off the newly grown crystal dendrites under vibration, which plays a role in refining the grains;

[0039] Step 4: 0.5 to 1 minute after the start of the excitation, turn on the cooling water 12. The cooling water 12 enters from the water inlet 3 and fills the entire water storage enclosure 6 to cool the bottom of the thrust sliding bearing base 9. The cooling water 12 is continuously injected, overflows from the water storage enclosure 6, and flows out from the water outlet 4. The water storage enclosure 6 ensures that the bottom surface of the thrust sliding bearing base 9 is in contact with the cooling water 12. The water outlet enclosure 7 ensures that the water flows out of the water outlet 4 and does not overflow outside the tooling.

[0040] Step 5: When the temperature of the tin-based alloy 10 drops to 80°C to 100°C below the liquidus, the excitation motor 11 is turned off; when the temperature of the tin-based alloy 10 drops to 110°C to 150°C, the cooling water 12 is turned off;

[0041] Step 6: Unscrew the long screws 13, remove the four pressing plates 16 on the upper support plate 2, take out the thrust sliding bearing base 9, and the casting is completed.

Claims

1. A vibration casting method for thrust sliding bearing alloy, characterized in that: A thrust sliding bearing alloy vibration pouring device is used for alloy pouring, the device comprising a pouring base (1), a plurality of columns (14) are evenly arranged on the pouring base (1), an upper support plate (2) is mounted on the columns (14), an excitation motor (11) is arranged on the edge of the upper support plate (2), a plurality of pressure plates (16) are arranged on the upper support plate (2), the plurality of pressure plates (16) form a circle corresponding to the shape of the thrust sliding bearing base (9) of the alloy to be poured, a water storage enclosure (6) is arranged on the periphery of the pressure plate (16), and a water cooling structure is also arranged on the upper support plate (2); The bottom of the pressing plate (16) is fixed to the upper support plate (2) via long screws (13); A plurality of short screws (8) are provided on the upper support plate (2) at a position within a circle formed by the plurality of pressure plates (16); The method specifically comprises the following steps: Step 1: Unscrew the long screw (13), remove the pressure plate (16) on the upper support plate (2), place the thrust sliding bearing base (9) of the alloy to be cast on the short screw (8), and then tighten the long screw (13); Step 2: injecting the tin-based alloy into the upper surface of the thrust sliding bearing substrate (9) at a temperature of 30°C to 100°C above the liquidus; Step 3: Immediately after the injection is completed, the excitation motor (11) is started, the excitation frequency is ≥8000 times / minute, and the excitation direction is horizontal; Step 4: 0.5 to 1 minute after the start of the excitation, the cooling water is turned on to cool the bottom of the thrust sliding bearing base (9); Step 5: When the temperature of the tin-based alloy drops to 80°C to 100°C below the liquidus, the excitation motor (11) is turned off; when the temperature of the tin-based alloy drops to 110°C to 150°C, the cooling water is turned off; Step 6: Unscrew the long screw (13), remove the pressure plate (16) on the upper support plate (2), and take out the thrust sliding bearing base (9). The casting is completed.

2. The thrust sliding bearing alloy vibration casting method according to claim 1, characterized in that: A positioning hole (15) is provided on the upper support plate (2), and the positioning hole (15) is clearance-matched with the column (14).

3. The thrust sliding bearing alloy vibration casting method according to claim 1, characterized in that: A damping spring (5) is provided on the inner side of the upright column (14), and the upper portion of the damping spring (5) is in contact with the upper support plate (2).

4. The thrust sliding bearing alloy vibration casting method according to claim 1, characterized in that: A water outlet enclosure (7) is provided on the upper support plate (2) at a location outside the water storage enclosure (6), and the cross sections of the water storage enclosure (6) and the water outlet enclosure (7) are both annular.

5. The thrust sliding bearing alloy vibration casting method according to claim 4, characterized in that: The water cooling structure comprises a water inlet (3) and a plurality of water outlets (4), wherein the water inlet (3) is arranged within a circle surrounded by the pressure plate (16), and the water outlets (4) are arranged at a position between the water storage enclosure (6) and the water outlet enclosure (7), and both the water inlet (3) and the water outlet (4) pass through the upper support plate (2).

Images