Lubricating circulating constant-temperature system of five-axis rotary table bearing

Abstract

The invention provides a lubrication circulation constant temperature system for a five-axis turntable bearing, which comprises a bearing outer ring fixed in a five-axis turntable shell; the bearing inner ring is sleeved with the bearing outer ring, and a gap is formed between the bearing inner ring and the bearing outer ring; the oil groove is formed in the periphery of the bearing outer ring, the upper annular cavity is defined by the upper portion of the bearing outer ring, an upper rotating sealing ring, an upper sealing ring, a shell and a rotating shaft, and the lower annular cavity is defined by the lower portion of the bearing outer ring, a lower rotating sealing ring, a lower sealing ring, the shell and a rotor connected with the rotating shaft in a sleeving mode and communicated with the oil groove through the gap; the flowing path of the lubricating oil is from the oil inlet channel to the oil groove to the gap formed in the bearing to the upper annular cavity and from the lower annular cavity to the oil outlet channel in sequence, and the output end of the oil outlet channel is connected with a cooling circulation system for temperature control.

Description

Technical Field

[0001] The present invention relates to the technical field of five-axis turntable manufacturing, and more specifically to a lubrication circulation constant temperature system for a five-axis turntable bearing. Background Art

[0002] With the widespread application of five-axis machining technology in aerospace, precision molds and other fields, the thermal stability and lubrication reliability of the turntable bearing inner ring system have become the core bottleneck restricting machining accuracy. Traditional lubrication systems have three major defects:

[0003] Temperature control hysteresis: Relying on an external cooler for passive heat dissipation, the operating temperature of the bearing inner ring fluctuates by as much as ±15°C, resulting in thermal deformation errors and seriously affecting surface machining accuracy.

[0004] Uneven lubrication: Single-channel oil supply is prone to forming oil film cavitation under high-speed rotation, and local lubrication failure leads to accelerated wear of the bearing inner ring;

[0005] Energy consumption redundancy: The constant flow oil supply mode causes more than 30% energy waste under light load conditions, and the oil contamination accelerates the failure of the inner ring of the precision bearing.

[0006] Especially in the processing of large and complex components, traditional systems find it difficult to meet the stringent requirements of the ISO 10791-6 standard for temperature rise and radial runout of five-axis turntables, and innovative lubrication and constant temperature solutions are urgently needed. Summary of the Invention

[0007] In view of this, the present invention proposes a lubrication circulation constant temperature system for a five-axis turntable bearing, a lubrication circulation constant temperature system for a five-axis turntable bearing, comprising: a bearing outer ring 10, which is fixed in a five-axis turntable housing 30; a bearing inner ring 20 is sleeved with the bearing outer ring 10 and a gap is formed between the bearing outer ring 10; an oil groove 21 is arranged on the outer periphery of the bearing outer ring 10, an upper annular chamber 25 is formed by the upper part of the bearing outer ring 10 and the upper rotating seal ring 27, the upper seal ring 28, the housing 30, and the rotating shaft 40, and a lower annular chamber 29 is formed by the lower part of the bearing outer ring 10 and the lower rotating seal ring 31, the lower seal ring 32, the housing 30, and the rotor 50 sleeved with the rotating shaft 40, and is connected to the oil groove 21 through the gap; the lubricating oil The flow path is as follows: oil inlet channel 23 to oil groove 21 to the gap formed inside the bearing to upper annular chamber 25 and lower annular chamber 29 to oil outlet channel 26. The output end of oil outlet channel 26 is connected to the cooling circulation system for temperature control. Through the gap and the coordinated design of upper annular chamber 25 and lower annular chamber 29, an axial-radial composite oil film is formed, which increases the bearing capacity of the bearing inner ring 20 by 50%, suppresses the high-speed centrifugal oil throwing effect, and improves the oil utilization rate by 40%. The oil film pressure is evenly distributed, and the friction power consumption is reduced to 1 / 3 of the traditional structure. The closed-loop temperature control system compresses the oil temperature fluctuation to ±1°C. Combined with the cooling circulation system, the thermal expansion of the bearing inner ring 20 is stabilized within 0.003mm, ensuring the turntable repeatability accuracy of ≤±0.002mm.

[0008] A lubrication circulation constant temperature system for a five-axis turntable bearing, comprising: a bearing outer ring 10, which is fixed in a five-axis turntable housing 30; a bearing inner ring 20 that is sleeved with the bearing outer ring 10 and forms a gap with the bearing outer ring 10; an oil groove 21, which is arranged on the outer periphery of the bearing outer ring 10; an upper annular chamber 25, which is formed by the upper part of the bearing outer ring 10 and the upper rotating seal ring 27, the upper seal ring 28, the housing 30, and the rotating shaft 40; a lower annular chamber 29, which is formed by the lower part of the bearing outer ring 10 and the lower rotating seal ring 31, the lower seal ring 32, the housing 30, and the rotor 50 sleeved with the rotating shaft 40, and is connected to the oil groove 21 through the gap; the flow path of the lubricating oil is: an oil inlet channel 23 to the oil groove 21 to the gap formed inside the bearing to the upper annular chamber 25 and the lower annular chamber 29 to the oil outlet channel 26, and the output end of the oil outlet channel 26 is connected to the cooling circulation system for temperature control.

[0009] Furthermore, the oil outlet channel 26 includes an upper oil outlet channel 261 and a lower oil outlet channel 262 . The upper oil outlet channel 261 is connected to the upper annular chamber 25 , and the lower oil outlet channel 262 is connected to the lower annular chamber 29 .

[0010] Furthermore, the oil inlet channel 23 has an oil injection hole 24 arranged in the radial direction, and the oil injection hole 24 is located at the bottom of the housing 30.

[0011] Furthermore, the cooling circulation system includes an oil cooler and a circulation pump, and the outlet of the circulation pump is connected to the oil inlet channel 23 through a pipeline.

[0012] Furthermore, the cooler adopts an air-cooled or water-cooled heat exchanger.

[0013] Furthermore, the oil outlet channel 26 is provided with a temperature sensor and a flow regulating valve, and the temperature sensor and the flow regulating valve are signal-linked to achieve dynamic thermal balance control.

[0014] Furthermore, the oil outlet channel 26 is located on the side of the upper annular chamber 25 and the lower annular chamber 29 away from the bearing inner ring 20, so that an effective oil film is formed in the gap, which can ensure sufficient lubrication time without direct discharge.

[0015] In some embodiments, the radial width of the gap is set to 0.1-2 mm. The gap width directly affects the flow state of the lubricating oil and the formation of the dynamic pressure oil film. According to the Reynolds equation, if the gap is too small (<0.1 mm), the flow resistance of the lubricating oil will increase sharply, making it difficult to establish a stable dynamic pressure lubricating film and exacerbating the boundary friction; if the gap is too large (>2 mm), the oil film pressure distribution will be uneven, the load-bearing capacity will be reduced, and direct contact wear of the bearing inner ring 20 will occur during high-speed rotation; within the range of 0.1-2 mm, the lubricating oil can form a laminar flow state (Reynolds number Re<2000), which can not only ensure sufficient lubricant flow (about 5-20 L / min) to take away friction heat, but also control the leakage through the throttling effect of the gap (leakage rate <3%), thereby avoiding a decrease in the efficiency of the lubrication system; the gap width is negatively correlated with the lubricating oil flow rate (flow rate v=Q / A, Q is the flow rate, and A is the gap cross-sectional area). By setting a gap of 0.1-2 mm, the flow rate of the lubricating oil in the gap can be controlled in the range of 0.5-5 m / s, ensuring that the contact time between the lubricating oil and the bearing inner ring 20 (residence time Δt = gap length L / flow rate v) is sufficient to complete heat transfer, while avoiding insufficient heat dissipation due to excessive flow rate. Experimental data show that under this clearance, the temperature rise of the bearing inner ring 20 can be controlled within ΔT ≤ 15°C (at an ambient temperature of 25°C); a narrow clearance (0.1-0.5mm) is suitable for low-speed and high-load conditions, and dissipates heat quickly through high flow rates; a wide clearance (1-2mm) is suitable for high-speed and light-load scenarios, reducing flow resistance. This system can stabilize the operating temperature of the bearing inner ring 20 in the optimal lubrication range of 40-60°C (lubricating oil viscosity η = 20-40cSt) by dynamically adjusting the clearance and coordinating the cooling cycle. When the five-axis turntable is in operation, the bearing inner ring 20 component will generate a temperature gradient (typical temperature difference ΔT = 30-50°C) due to friction and the external environment. Assuming that the bearing inner ring 20 is made of GCr15 steel (linear expansion coefficient α = 11.5×10 -6 / °C), when the diameter D = 200mm, the thermal expansion ΔD = α·D·ΔT ≈ 0.069-0.115mm. A gap of 0.1-2mm can completely absorb thermal deformation, preventing seizure or gap closure due to expansion; the gap width is closely related to the system stiffness. Finite element analysis (FEA) shows that when the gap is 0.5mm, the radial stiffness of the bearing inner ring 20 system can reach 10 8 At the N / m level, the radial vibration amplitude of the turntable can be suppressed to within ±1μm, meeting the spindle runout accuracy requirement of five-axis machining (≤0.005mm). A clearance accuracy of 0.1mm requires precision grinding (IT5 accuracy, surface roughness Ra ≤0.4μm), while a clearance of 2mm can be achieved through conventional machining (IT7). This range balances the manufacturing capabilities of high-precision bearing inner rings (such as angular contact ball bearing inner rings) with mass production cost control. A clearance of >0.1mm eliminates the risk of sticking caused by tiny impurities (particle size ≥10μm) in the lubricating oil. Combined with a filtration system (filtration accuracy β3 ≥10μm), the contamination failure rate of the bearing inner ring 20 can be reduced to below 0.1%. Furthermore, this clearance range allows the use of high-viscosity grease (NLGI grade 2) as a secondary sealing medium, improving system reliability.

[0016] In some embodiments, the oil groove 21 is an annular oil groove 21 with a concave shape on the outer circumference of the bearing outer ring 10 , which is used to store the oil entering the oil inlet channel 23 . The oil groove 21 is connected to the gap through an oil groove hole 22 .

[0017] In some embodiments, the bearing outer ring 10 is sleeved on the middle part of the bearing inner ring 20 to form an upper annular chamber 25 and a lower annular chamber 29, and the lubricating oil flow is distributed to the upper and lower load-bearing areas of the bearing inner ring 20 through the diversion effect; computational fluid dynamics (CFD) simulation shows that compared with the single-chamber structure, the dual-chamber design can improve the uniformity of oil film pressure distribution by 40%, effectively avoiding the risk of oil film rupture caused by local high-pressure areas (>5MPa); when the lubricating oil enters the sub-chamber from the main gap, secondary throttling is generated at the chamber inlet (pressure drop ΔP≈0.2-0.5MPa), forcing the oil to form a stable laminar flow state in the sub-chamber (Reynolds number Re drops from 3000 to below 1500), significantly reducing turbulent energy loss (reduced by about 25%).

[0018] In some embodiments, the rotating shaft 40 is sleeved inside the bearing inner ring 20 , and the rotating shaft 40 is used to connect with the workbench to drive the workbench to rotate radially. The bearing inner ring 20 is used to control the stability of the radial rotation of the rotating shaft 40 .

[0019] Beneficial effects of the invention: The invention proposes a lubrication circulation constant temperature system for a five-axis turntable bearing, a lubrication circulation constant temperature system for a five-axis turntable bearing, comprising: a bearing outer ring 10, which is fixed in a five-axis turntable housing 30; a bearing inner ring 20 is sleeved with the bearing outer ring 10 and a gap is formed between the bearing outer ring 10; an oil groove 21 is arranged on the outer periphery of the bearing outer ring 10, an upper annular chamber 25 is formed by the upper part of the bearing outer ring 10 and the upper rotating seal ring 27, the upper seal ring 28, the housing 30, and the rotating shaft 40, and a lower annular chamber 29 is formed by the lower part of the bearing outer ring 10 and the lower rotating seal ring 31, the lower seal ring 32, the housing 30, and the rotor 50 sleeved with the rotating shaft 40, and is connected to the oil groove 21 through the gap; the lubrication The oil flow path is as follows: oil inlet channel 23 to oil groove 21 to the gap formed inside the bearing to upper annular chamber 25 and lower annular chamber 29 to oil outlet channel 26. The output end of oil outlet channel 26 is connected to the cooling circulation system for temperature control. Through the gap and the coordinated design of upper annular chamber 25 and lower annular chamber 29, an axial-radial composite oil film is formed, which increases the bearing capacity of the bearing inner ring 20 by 50%, suppresses the high-speed centrifugal oil throwing effect, and improves the oil utilization rate by 40%. The oil film pressure is evenly distributed, and the friction power consumption is reduced to 1 / 3 of the traditional structure. The closed-loop temperature control system compresses the oil temperature fluctuation to ±1°C. Combined with the cooling circulation system, the thermal expansion of the bearing inner ring 20 is stabilized within 0.003mm, ensuring the turntable repeatability accuracy of ≤±0.002mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall structural diagram of the lubrication circulation constant temperature system of the five-axis turntable bearing of the present invention.

[0021] Figure 2 This is a cross-sectional view of the lubrication circulation constant temperature system of the five-axis turntable bearing of the present invention.

[0022] Figure 3 This is a right side cross-sectional detail view of the lubrication circulation constant temperature system for the five-axis turntable bearing of the present invention.

[0023] Figure 4 This is a left side cross-sectional detail view of the lubrication circulation constant temperature system of the five-axis turntable bearing of the present invention.

[0024] Description of main component symbols.

[0025] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

[0026] Bearing outer ring 10, bearing inner ring 20, oil groove 21, oil groove hole 22, oil inlet channel 23, oil filling hole 24, upper annular chamber 25, oil outlet channel 26, upper oil outlet channel 261, lower oil outlet channel 262, upper rotating seal ring 27, upper seal ring 28, lower annular chamber 29, housing 30, rotating seal ring 31, lower seal ring 32, rotating shaft 40, rotor 50. DETAILED DESCRIPTION Example 1:

[0027] like Figure 1-4 As shown, the present invention proposes a lubrication circulation constant temperature system for a five-axis turntable bearing, comprising: a bearing outer ring 10, which is fixed in a five-axis turntable housing 30; a bearing inner ring 20 and the bearing outer ring 10 are sleeved together to form a gap between the bearing outer ring 10; the radial width of the gap is set to 0.1-2mm, and the gap width directly affects the flow state of the lubricating oil and the formation of the dynamic pressure oil film. According to the Reynolds equation, if the gap is too small (<0.1mm), the flow resistance of the lubricating oil will increase sharply, making it difficult to establish a stable dynamic pressure lubrication film and aggravating the boundary friction; if the gap is too large ( >2mm) will cause uneven oil film pressure distribution, reducing load-bearing capacity and leading to direct contact wear of the bearing inner ring 20 during high-speed rotation. Within the 0.1-2mm range, the lubricant forms a laminar flow state (Reynolds number Re < 2000), ensuring sufficient lubricant flow (approximately 5-20L / min) to remove frictional heat while controlling leakage (leakage rate < 3%) through the throttling effect of the gap, thus preventing a decrease in lubrication system efficiency. The gap width is inversely correlated with the lubricant flow rate (flow rate v = Q / A, where Q is the flow rate and A is the gap cross-sectional area). By setting a gap of 0.1-2mm, the lubricant flow rate within the gap can be controlled within the range of 0.5-5m / s, ensuring sufficient contact time between the lubricant and the bearing inner ring 20 (dwell time Δt = gap length L / flow rate v) to complete heat transfer while avoiding inadequate heat dissipation due to excessive flow rate. Experimental data show that under this clearance, the temperature rise of the bearing inner ring 20 can be controlled within ΔT ≤ 15°C (at an ambient temperature of 25°C); a narrow clearance (0.1-0.5mm) is suitable for low-speed and high-load conditions, and dissipates heat quickly through high flow rates; a wide clearance (1-2mm) is suitable for high-speed and light-load scenarios, reducing flow resistance. This system can stabilize the operating temperature of the bearing inner ring 20 in the optimal lubrication range of 40-60°C (lubricating oil viscosity η = 20-40cSt) by dynamically adjusting the clearance and coordinating the cooling cycle. When the five-axis turntable is in operation, the bearing inner ring 20 component will generate a temperature gradient (typical temperature difference ΔT = 30-50°C) due to friction and the external environment. Assuming that the bearing inner ring 20 is made of GCr15 steel (linear expansion coefficient α = 11.5×10 -6 / °C), when the diameter D = 200mm, the thermal expansion ΔD = α·D·ΔT ≈ 0.069-0.115mm. A gap of 0.1-2mm can completely absorb thermal deformation, preventing seizure or gap closure due to expansion; the gap width is closely related to the system stiffness. Finite element analysis (FEA) shows that when the gap is 0.5mm, the radial stiffness of the bearing inner ring 20 system can reach 10 8 The N / m level can suppress the radial vibration amplitude of the turntable to within ±1μm, meeting the requirements of the five-axis linkage machining for the spindle runout accuracy (≤0.005mm); the clearance accuracy of 0.1mm requires precision grinding (IT5 level accuracy, surface roughness Ra≤0.4μm), while the 2mm clearance can be achieved through conventional machining (IT7 level). This range takes into account the manufacturing capabilities of high-precision bearing inner rings 20 (such as angular contact ball bearing inner rings 20) and mass production cost control; a clearance >0.1mm can avoid the risk of sticking of tiny impurities (particle size ≥10μm) in the lubricating oil, and combined with the filtration system (filtration accuracy β3 ≥10μm), the contamination failure rate of the bearing inner ring 20 can be reduced to below 0.1%; at the same time, this clearance range allows the use of high-viscosity grease (NLGI An oil groove 21 is provided on the outer circumference of the bearing outer ring 10. The oil groove 21 is an annular, concave groove 21 on the outer circumference of the bearing outer ring 10 and is used to store oil entering the oil inlet channel 23. The oil groove 21 is connected to the gap through an oil groove hole 22. The oil groove 21 is connected to the external oil supply system through the oil inlet channel 23. The oil inlet channel 23 has a radially arranged oil filling hole 24 located at the bottom of the housing 30. The upper annular chamber 25 is formed by the upper portion of the bearing outer ring 10, the upper rotating seal ring 27, the upper seal ring 28, the housing 30, and the rotating shaft 40. The lower annular chamber 29 is formed by the lower portion of the bearing outer ring 10, the lower rotating seal ring 31, the lower seal ring 32, the housing 30, and the rotor 50 sleeved on the rotating shaft 40, and is connected to the oil groove 21 through the gap.

[0028] The flow path of the lubricating oil is as follows: the oil inlet channel 23 to the oil groove 21 to the gap formed inside the bearing to the upper annular chamber 25 and the lower annular chamber 29 to the oil outlet channel 26. The oil outlet channel 26 is arranged at the housing 30 and is connected to the annular chamber 25; the oil outlet channel 26 is located on the side of the upper annular chamber 25 and the lower annular chamber 29 away from the bearing inner ring 20. The oil outlet channel 26 includes an upper oil outlet channel 261 and a lower oil outlet channel 262. The upper oil outlet channel 261 is connected to the upper annular chamber 25, and the lower oil outlet channel 262 is connected to the lower annular chamber 29, so that an effective oil film is formed at the gap, which can ensure sufficient lubrication time without direct discharge; the output end of the oil outlet channel 26 is connected to the cooling circulation system, which includes an oil cooler and a circulation pump. The outlet of the circulation pump is connected to the oil cooler. The pipeline is connected to the oil inlet channel 23. The cooler adopts an air-cooled or water-cooled heat exchanger. The oil outlet channel 26 is provided with a temperature sensor and a flow control valve. The temperature sensor is linked to the flow control valve signal to realize dynamic thermal balance control. The gap is coordinated with the upper annular chamber 25 and the lower annular chamber 29 to form an axial-radial composite oil film, which increases the bearing capacity of the inner ring 20 of the bearing by 50%, and suppresses the high-speed centrifugal oil throwing effect, and the oil utilization rate is increased by 40%. The oil film pressure is evenly distributed, and the friction power consumption is reduced to 1 / 3 of the traditional structure. The closed-loop temperature control system reduces the oil temperature fluctuation to ±1°C. Combined with the cooling circulation system, the thermal expansion of the inner ring 20 of the bearing is stabilized within 0.003mm, ensuring the repeatability of the turntable positioning accuracy ≤±0.002mm.

[0029] The bearing outer ring 10 is sleeved on the middle part of the bearing inner ring 20 to form an upper annular chamber 25 and a lower annular chamber 29, which distributes the lubricating oil flow to the upper and lower load-bearing areas of the bearing inner ring 20 through the diversion effect; computational fluid dynamics (CFD) simulation shows that compared with the single-chamber structure, the dual-chamber design can improve the uniformity of oil film pressure distribution by 40%, effectively avoiding the risk of oil film rupture caused by local high-pressure areas (>5MPa); when the lubricating oil enters the sub-chamber from the main gap, secondary throttling is generated at the chamber inlet (pressure drop ΔP≈0.2-0.5MPa), forcing the oil to form a stable laminar flow state in the sub-chamber (Reynolds number Re is reduced from 3000 to below 1500), significantly reducing turbulent energy loss (reduced by about 25%).

[0030] The rotating shaft 40 is sleeved in the inner ring of the bearing 20 . The rotating shaft 40 is used to connect with the workbench to drive the workbench to rotate radially. The inner ring of the bearing 20 is used to control the stability of the radial rotation of the rotating shaft 40 .

[0031] Beneficial effects of the invention: The invention proposes a lubrication circulation constant temperature system for a five-axis turntable bearing, a lubrication circulation constant temperature system for a five-axis turntable bearing, comprising: a bearing outer ring 10, which is fixed in a five-axis turntable housing 30; a bearing inner ring 20 is sleeved with the bearing outer ring 10 and a gap is formed between the bearing outer ring 10; an oil groove 21 is arranged on the outer periphery of the bearing outer ring 10, an upper annular chamber 25 is formed by the upper part of the bearing outer ring 10 and the upper rotating seal ring 27, the upper seal ring 28, the housing 30, and the rotating shaft 40, and a lower annular chamber 29 is formed by the lower part of the bearing outer ring 10 and the lower rotating seal ring 31, the lower seal ring 32, the housing 30, and the rotor 50 sleeved with the rotating shaft 40, and is connected to the oil groove 21 through the gap; the lubrication The oil flow path is as follows: oil inlet channel 23 to oil groove 21 to the gap formed inside the bearing to upper annular chamber 25 and lower annular chamber 29 to oil outlet channel 26. The output end of oil outlet channel 26 is connected to the cooling circulation system for temperature control. Through the gap and the coordinated design of upper annular chamber 25 and lower annular chamber 29, an axial-radial composite oil film is formed, which increases the bearing capacity of the bearing inner ring 20 by 50%, suppresses the high-speed centrifugal oil throwing effect, and improves the oil utilization rate by 40%. The oil film pressure is evenly distributed, and the friction power consumption is reduced to 1 / 3 of the traditional structure. The closed-loop temperature control system compresses the oil temperature fluctuation to ±1°C. Combined with the cooling circulation system, the thermal expansion of the bearing inner ring 20 is stabilized within 0.003mm, ensuring the turntable repeatability accuracy of ≤±0.002mm.

[0032] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A lubrication circulation constant temperature system for a five-axis turntable bearing, characterized by: include: The outer ring of the bearing (10) is fixed in the housing (30) of the five-axis turntable; the inner ring of the bearing (20) is sleeved with the outer ring of the bearing (10) and forms a gap with the outer ring of the bearing (10); the oil groove (21) is arranged on the outer periphery of the outer ring of the bearing (10); the upper annular chamber (25) is formed by the upper part of the outer ring of the bearing (10) and the upper rotating seal ring (27), the upper seal ring (28), the housing (30), and the rotating shaft (40); the lower annular chamber (29) is formed by the outer ring of the bearing (10) ) is enclosed by the lower rotating seal ring (31), the lower seal ring (32), the housing (30), and the rotor (50) sleeved with the rotating shaft (40), and is connected to the oil groove (21) through the gap; the flow path of the lubricating oil is as follows: the oil inlet channel (23) to the oil groove (21) to the gap formed inside the bearing to the upper annular chamber (25) and the lower annular chamber (29) to the oil outlet channel (26), and the output end of the oil outlet channel (26) is connected to the cooling circulation system for temperature control.

2. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 1, characterized in that: The oil inlet channel (23) has an oil injection hole (24) arranged in a radial direction, and the oil injection hole (24) is located at the bottom of the housing (30).

3. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 1, characterized in that: The cooling circulation system comprises an oil cooler and a circulation pump, wherein the outlet of the circulation pump is connected to the oil inlet channel (23) via a pipeline.

4. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 3, characterized in that: The cooler adopts an air-cooled or water-cooled heat exchanger.

5. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 1, characterized in that: The oil outlet channel (26) is provided with a temperature sensor and a flow regulating valve, and the temperature sensor and the flow regulating valve are signal-linked to achieve dynamic thermal balance control.

6. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 1, characterized in that: The oil outlet channel (26) is located on a side of the upper annular chamber (25) and the lower annular chamber (29) away from the bearing inner ring (20), so that an effective oil film is formed in the gap, which allows sufficient lubrication time without direct discharge.

7. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 1, characterized in that: The radial width of the gap is set to 0.1-2 mm.

8. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 1, characterized in that: The oil groove (21) is an annular oil groove (21) with an inward concave shape on the outer circumference of the bearing outer ring (10), and is used to store oil entering from the oil inlet channel (23). The oil groove (21) is connected to the gap via an oil groove hole (22).

9. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 1, characterized in that: The bearing outer ring (10) is sleeved on the middle portion of the bearing inner ring (20) to form an upper annular chamber (25) and a lower annular chamber (29), and the upper and lower sub-chambers form symmetrical flow channels.

10. The lubrication circulation constant temperature system for the five-axis turntable bearing according to claim 1, characterized in that: The rotating shaft (40) is sleeved in the bearing inner ring (20), and the rotating shaft (40) is used to connect with the workbench to drive the workbench to rotate radially. The bearing inner ring (20) is used to control the stability of the radial rotation of the rotating shaft (40).

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