A splash-proof oil return cooling device and method

Abstract

The application discloses a kind of anti-splashing oil return cooling device and method, belong to the technical field of blind hole processing.The anti-splashing oil return cooling device disclosed in the application can solve the problem of uneven high-pressure spraying of cooling oil pressure during the cooling process when the hole is open momentarily, which can cause cabin pollution, form oil mist, and the splashed cooling oil mist can not only pollute the environment;At the same time, the oil inlet pipe and the oil return pipe are arranged, the external cooling cycle is increased to balance the temperature difference of the part thin-wall through hole in an instant, balance the flow, and the accumulated chip can be better taken away, the ablation of the part is prevented, and the cooling effect is better improved.

Description

Technical Field

[0001] This invention belongs to the field of blind hole processing technology, specifically relating to an anti-splash oil return cooling device and method. Background Technology

[0002] Deep hole machining refers to the machining process of holes with a depth-to-diameter ratio (L / D) greater than 6. When the hole depth exceeds 10 times the diameter, it falls into the typical category of deep hole machining. CNC deep hole drilling machines, as specialized machining equipment, are characterized by an internal cooling system, where coolant is directly delivered to the cutting area through a central through-hole in the spindle. This process presents two significant technical challenges: firstly, the cutting heat transfer efficiency is low, as the tool's large length-to-diameter ratio and its surrounding material make heat dissipation difficult through conventional means; secondly, the chip removal channel is lengthy, easily leading to chip retention. During deep hole machining, the tool holder system exhibits a large length-to-diameter ratio (typically L / D > 20), exacerbating the following problems: 1) The extended heat transfer path increases the temperature gradient in the cutting zone, with the average temperature on the tool rake face reaching 800-1000℃; 2) As the hole depth increases, the probability of chips undergoing secondary cutting during removal increases significantly, promoting the formation of built-up edge (BUE). The periodic formation and shedding of built-up edge can cause a deterioration in the surface roughness of the machined surface (Ra value increases by 0.8-1.6 μm) and at the same time cause fluctuations in cutting force (amplitude can reach 20-30%).

[0003] To address these issues, modern deep hole machining equipment commonly employs high-pressure cooling systems (HPC), typically operating at pressures of 7-15 MPa and maintaining a flow rate of 60-120 L / min. While this forced cooling method effectively reduces cutting temperature (controlling it below 600°C on the rake face), it generates serious hydrodynamic problems: 1) The high-pressure jet impacts the workpiece surface, creating a misting effect and producing oil mist particles (PM5) with a diameter less than 5 μm; 2) Coolant splashing leads to a 15-25% loss in effective cooling flow, causing localized insufficient cooling and resulting in workpiece surface burns (manifested as a 20-30 HV decrease in microhardness). From an occupational health and environmental protection perspective, this machining method presents dual hazards: 1) Oil mist emission concentrations exceed the OSHA limit of 5 mg / m³, and long-term exposure can lead to respiratory illnesses in operators; 2) Coolants containing extreme pressure additives (such as sulfur and chlorine) degrade to produce benzene derivatives, causing soil pollution. Currently, the industry is addressing these challenges by developing technologies such as fully enclosed processing chambers (isolation efficiency > 98%), electrostatic oil mist collection systems (capture efficiency 90-95%), and biodegradable coolants (degradation rate > 85%).

[0004] While deep hole machining equipment possesses a degree of versatility, capable of adapting to machining requirements for varying hole diameters (Ø5-50mm) and depths (100-2000mm), the diverse nature of on-site production conditions necessitates a trade-off between versatility and specialization in its design, inevitably leading to certain technical limitations. For instance, when machining high-hardness materials (such as hardened steel and high-temperature alloys), the increased cutting forces and thermal loads may render general-purpose deep hole drilling machines insufficiently rigid, resulting in increased tool runout and affecting hole position accuracy (deviations can reach 0.05-0.1mm). Furthermore, when dealing with different workpiece materials (such as aluminum alloys, stainless steel, and titanium alloys), cutting parameters (such as feed rate and spindle speed) and coolant pressure require frequent adjustments. The control systems of general-purpose equipment often lack the ability to quickly adapt and optimize, resulting in a 10-20% reduction in machining efficiency. Simultaneously, due to the specific nature of deep hole machining, equipment structures typically employ modular designs, such as adjustable guide supports and multi-stage filtration and chip removal systems. However, these modules may exhibit compatibility issues when adapting to different machining scenarios. For example, when machining small-diameter deep holes (Ø<10mm), the high-pressure cooling system may experience insufficient flow (<30L / min), while when machining large-diameter deep holes (Ø>30mm), the chip removal channel may become blocked due to chip accumulation. Furthermore, the protective systems of general-purpose equipment often cannot fully cover the oil mist splash range under different operating conditions, leading to excessive oil mist concentrations in localized areas (>10mg / m³), further exacerbating environmental pollution and health risks. Therefore, although deep hole drilling machines are designed to be universal, in actual production, targeted optimization based on specific processing requirements (such as material properties, processing accuracy, batch size, etc.) is still necessary, and even customized solutions may be adopted to compensate for the performance deficiencies of general-purpose equipment under specific operating conditions. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-splash oil return cooling device and method to solve the technical problem that existing cooling devices suffer from poor cooling effect due to splashing.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] This invention discloses an anti-splash oil return cooling device, comprising a housing, an oil inlet pipe, an oil return pipe, a machining hole, and an anti-splash ramp; the machining hole is located at one end of the housing, opposite to the machining spindle; the anti-splash ramp is inclinedly arranged inside the other end of the housing, with one end of the anti-splash ramp forming an angle with the bottom of the housing, and the other end connected to the upper side of the other end of the housing; one end of the oil inlet pipe is connected to the upper part of one side of the housing; and one end of the oil return pipe is connected to the lower part of the other side of the housing.

[0008] Furthermore, several overflow holes are provided at the bottom of the other end of the box.

[0009] Furthermore, a cooling groove is provided on the bottom surface of the housing; the cooling groove is opposite to the oil return pipe.

[0010] Furthermore, the oil inlet pipe is connected to the housing via an external thread and an internal thread of the oil return pipe;

[0011] The external thread of the return oil pipe is located on the outer surface of the inlet oil pipe; the internal thread of the return oil pipe is located on the side of the housing.

[0012] Furthermore, the return oil pipe is connected to the housing via an external thread and an internal thread of the inlet oil pipe;

[0013] The external thread of the oil inlet pipe is located on the outer surface of the return oil pipe; the internal thread of the oil inlet pipe is located on the side of the housing.

[0014] Furthermore, a sliding cover is provided on the upper part of the box.

[0015] Furthermore, the sliding cover is slidably connected to the upper part of the box body via a sliding device; the sliding device includes a first slide rail and a second slide rail; the first slide rail and the second slide rail are arranged opposite to each other on the upper part of the box body; the two sides of the sliding cover are respectively embedded in the first slide rail and the second slide rail.

[0016] Furthermore, the other end of the oil inlet pipe is connected to the cooling oil circuit; the other end of the oil return pipe is connected to the oil return tank.

[0017] Furthermore, the machining hole is square.

[0018] The present invention also discloses a method of using the above-mentioned anti-splash oil return cooling device, comprising the following steps:

[0019] Cooling oil is used to cool the workpiece at the machining hole through the oil inlet pipe. The high-pressure splash generated during cooling is slowed down by the anti-splash ramp, and then the cooling oil at the bottom of the box is discharged through the oil return pipe.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention discloses an anti-splash oil return cooling device. By setting an anti-splash ramp in the housing to buffer the high-pressure spray during the cooling process, it can solve the technical problem of uneven cooling oil pressure during instantaneous through-hole opening, which causes compartment pollution and forms oil mist. The splashing cooling oil mist not only pollutes the environment, but also, the oil inlet and return pipes increase the instantaneous temperature difference balance and flow balance of the external cooling circulation in the thin-walled through-hole of the part, and can better remove the built-up edge, prevent the part from burning, and improve the cooling effect.

[0022] Furthermore, the addition of several overflow holes at the bottom allows for better collection of cooling oil, mitigating its backflow and preventing environmental pollution. This facilitates the reuse of cooling oil, resulting in economic benefits. It also significantly reduces the biomimetic effect of oil mist.

[0023] Furthermore, the sliding cover facilitates the disassembly and replacement of different types of tooling, which helps to improve work efficiency. Attached Figure Description

[0024] Figure 1 This is a perspective view of the anti-splash oil return cooling device of the present invention;

[0025] Figure 2 This is a front view of the anti-splash oil return cooling device of the present invention;

[0026] Figure 3 This is a top view of the anti-splash oil return cooling device of the present invention;

[0027] Figure 4 This is a left view of the anti-splash oil return cooling device of the present invention;

[0028] Wherein: 1-oil inlet pipe; 2-oil return pipe; 3-external thread of oil return pipe; 4-internal thread of oil return pipe; 5-external thread of oil inlet pipe; 6-internal thread of oil inlet pipe; 7-first slide rail; 8-second slide rail; 9-machined hole; 10-anti-splash ramp; 11-overflow hole; 12-sliding cover; 13-box body; 14-cooling tank. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings:

[0032] See Figures 1-4 This invention discloses an anti-splash oil return cooling device, comprising a housing 13, an oil inlet pipe 1, an oil return pipe 2, a machining hole 9, and an anti-splash ramp 10; the machining hole 9 is located at one end of the housing 13, opposite to the machining spindle; the anti-splash ramp 10 is inclinedly arranged inside the other end of the housing 13, with one end of the anti-splash ramp 10 forming an angle with the bottom of the housing 13, and the other end connected to the upper side of the other end of the housing 13; one end of the oil inlet pipe 1 is connected to the upper part of one side of the housing 13; one end of the oil return pipe 2 is connected to the lower part of the other side of the housing 13, and the machining hole 9 may be square in shape; the other end of the oil inlet pipe 1 is connected to the cooling oil circuit through a pipeline, and a flow regulating valve is provided on the pipeline to adjust the flow rate according to the cooling requirements of the workpiece; the other end of the oil return pipe 2 is connected to the oil return tank.

[0033] Preferably, a number of overflow holes 11 are provided at the bottom of the other end of the housing 13, which are aligned with the spindle end, so as to quickly discharge the cooling oil.

[0034] Preferably, the oil inlet pipe 1 and the oil return pipe 2 are connected to the housing 13 via connectors; the connectors are an external thread 3 for the oil return pipe, an internal thread 4 for the oil return pipe, an external thread 5 for the oil inlet pipe, and an internal thread 6 for the oil inlet pipe. The oil inlet pipe 1 is connected to the housing 13 via the external thread 3 and the internal thread 4 for the oil return pipe; the external thread 3 for the oil return pipe is located on the outer surface of the oil inlet pipe 1; the internal thread 4 for the oil return pipe is located on the side of the housing 13. The oil return pipe 2 is connected to the housing 13 via the external thread 5 and the internal thread 6 for the oil inlet pipe; the external thread 5 for the oil inlet pipe is located on the outer surface of the oil return pipe 2; the internal thread 6 for the oil inlet pipe is located on the side of the housing 13. The fit of the internal and external threads facilitates the installation or disassembly of the oil inlet pipe 1 and the oil return pipe 2, which is beneficial for later maintenance.

[0035] Preferably, the sliding cover 12 is slidably connected to the upper part of the housing 13 via a sliding device; the sliding device includes a first slide rail 7 and a second slide rail 8; the first slide rail 7 and the second slide rail 8 are arranged opposite to each other on the upper part of the housing 13; the two sides of the sliding cover 12 are respectively embedded in the first slide rail 7 and the second slide rail 8; the first slide rail 7 and the second slide rail 8 cooperate with the sliding cover 12 to move, which facilitates the replacement of workpieces.

[0036] Preferably, a cooling groove 14 is provided on the bottom surface of the housing 13; the cooling groove 14 is opposite to the oil return pipe 2, which can discharge the coolant from the oil return pipe 2 more efficiently and quickly.

[0037] Example 1

[0038] The anti-splash oil return cooling device disclosed in this embodiment includes a housing 13, an oil inlet pipe 1, an oil return pipe 2, a machining hole 9, and an anti-splash ramp 10. The machining hole 9 is located at one end of the housing 13, opposite to the machining spindle. The anti-splash ramp 10 is inclinedly arranged inside the other end of the housing 13. One end of the anti-splash ramp 10 forms an angle with the bottom of the housing 13, allowing the coolant impacting the housing wall at high speed to flow back down the ramp instead of splashing directly to the outside of the machining area. The other end is connected to the upper side of the other end of the housing 13. The ramp structure can reduce the coolant flow rate. The impact speed is reduced, and atomization is reduced (PM5 particle generation is reduced by more than 50%), which meets occupational health standards. One end of the oil inlet pipe 1 is connected to the upper part of one side of the housing 13, so that the coolant covers the machining area in a waterfall manner, ensuring that the area in contact with the tool and the workpiece is cooled preferentially. One end of the oil return pipe 2 is connected to the lower part of the other side of the housing 13, which, together with the ramp, forms a "high inlet and low outlet" circulation path to quickly remove cutting heat (heat exchange efficiency is increased by 15%) and prevent workpiece ablation caused by heat accumulation (surface hardness fluctuation is reduced to ±5HV).

[0039] Example 2

[0040] The anti-splash oil return cooling device disclosed in this embodiment includes a housing 13, an oil inlet pipe 1, an oil return pipe 2, a machining hole 9, and an anti-splash ramp 10. The machining hole 9 is located at one end of the housing 13, opposite to the machining spindle. The anti-splash ramp 10 is inclinedly arranged inside the other end of the housing 13, with one end of the anti-splash ramp 10 forming an angle with the bottom of the housing 13 and the other end connected to the upper side of the other end of the housing 13. One end of the oil inlet pipe 1 is connected to the upper part of one side of the housing 13. One end of the oil return pipe 2 is connected to the lower part of the other side of the housing 13. Several overflow holes 11 are provided at the bottom of the other end of the housing 13 to prevent excessive accumulation of coolant, maintain a stable liquid level in the housing, promote the separation of chips and coolant, reduce pipe blockage, enhance system compatibility, adapt to different machining conditions, optimize heat exchange efficiency, and avoid local overheating.

[0041] Example 3

[0042] The splash-proof oil return cooling device disclosed in this embodiment includes a housing 13, an oil inlet pipe 1, an oil return pipe 2, a machining hole 9, and a splash-proof ramp 10. The machining hole 9 is located at one end of the housing 13, opposite to the machining spindle. The splash-proof ramp 10 is inclinedly arranged inside the other end of the housing 13, with one end of the ramp forming an angle with the bottom of the housing 13 and the other end connected to the upper side of the other end of the housing 13. One end of the oil inlet pipe 1 is connected to the upper part of one side of the housing 13. One end of the oil return pipe 2 is connected to the lower part of the other side of the housing 13. Furthermore, several overflow holes 11 are provided at the bottom of the other end of the housing 13; a sliding cover 12 is provided on the upper part of the housing 13; the sliding cover 12 is slidably connected to the upper part of the housing 13 through a sliding device; the sliding device includes a first slide rail 7 and a second slide rail 8; the first slide rail 7 and the second slide rail 8 are arranged opposite to each other on the upper part of the housing 13; the two sides of the sliding cover 12 are respectively embedded in the first slide rail 7 and the second slide rail 8, which can provide convenient operation and observation windows, realize dynamic sealing and splash suppression, facilitate maintenance and cleaning, and more importantly, improve safety.

[0043] Example 4

[0044] The anti-splash oil return cooling device in this embodiment includes an oil inlet pipe 1 and an oil return pipe 2. One end of the oil inlet pipe 1 is connected to the housing 13, and the other end is connected to a branch of the cooling oil circuit. One end of the oil return pipe 2 is connected to the housing 13, and the other end is connected to the oil return tank. The anti-splash oil return cooling device has a square machining hole 9 near the spindle end. The device is designed with an anti-splash ramp 10 inside, and an overflow hole 11 is opened directly opposite the spindle end. The oil inlet pipe 1 is fixed by an external thread 5 and an internal thread 6, and the oil return pipe 2 is fixed by an external thread 3 and an internal thread 4. The fit of the internal and external threads facilitates the installation or removal of the oil inlet pipe 1 and the oil return pipe 2, which is beneficial for later maintenance. A flow regulating valve is installed on the branch of the oil inlet pipe 1 to adjust the flow rate according to the cooling requirements of the workpiece. The first slide rail 7 and the second slide rail 8 move in conjunction with the sliding cover 12 to facilitate the replacement of the workpiece.

[0045] Example 5

[0046] When using the anti-splash return oil cooling device disclosed in this invention for processing cooling, the coolant is controlled to splash over a large area through the entire shell of the housing 13. The workpiece is cooled through the oil inlet pipe 1. The oil splash generated during cooling is slowed down by the anti-splash ramp 10. The coolant is guided to the return oil pipe 2 through the cooling tank 14 and introduced into the cooling oil tank. The return pressure is reduced through the overflow hole 11. During use, the workpiece can be quickly changed by the cooperation of the first slide rail 7 and the second slide rail 8.

[0047] The anti-splash oil return cooling device disclosed in this invention features a hydrodynamic design of an anti-splash ramp that converts the impact kinetic energy of high-pressure coolant into laminar flow along the ramp. Compared to traditional vertical baffle structures, this reduces oil mist generation and increases coolant return flow. The angle formed with the bottom of the tank guides the coolant to flow directionally to the return oil pipe 2, preventing sedimentation caused by eddies. Simultaneously, the coordinated drainage of the overflow hole 11 and the cooling tank 14 prevents hydraulic pressure exceeding limits within the tank. The corrugated groove design of the cooling tank 14 increases the heat exchange area, allowing for rapid cooling of the high-temperature coolant. The dual-slide rail system of the sliding cover 12 enables one-handed operation and facilitates observation of the machining depth. The threaded connection between the oil inlet pipe 1 and the return oil pipe 2 improves connection strength and facilitates disassembly. The return oil pipe 2 can integrate a flow sensor to monitor coolant cleanliness in real time.

[0048] The anti-splash oil return cooling device disclosed in this invention solves a long-standing problem in the blind hole machining of a key component of an aero-engine: uneven cooling oil pressure and high-pressure spraying during the instantaneous hole opening, causing cabin contamination and forming oil mist. This splashing cooling oil mist not only pollutes the environment but also poses irreversible health hazards to those exposed. Simultaneously, the addition of external cooling circulation addresses the issue of the slender and rigid tool holder, effectively improving drill bit life. It also balances temperature differences and flow rates during the instantaneous opening of thin-walled through holes in the part, and better removes built-up edge, preventing part ablation. Furthermore, collecting the cooling oil mitigates its backflow, preventing environmental pollution and facilitating its reuse, thus offering economic benefits. The device eliminates the delay of waiting for parts to be replaced in the machining chamber after the oil mist has completely dissipated, significantly improving machining efficiency. Its core innovation lies in the anti-splash ramp structure installed inside the chamber. This ramp, with an optimized tilt angle of 30-45°, effectively buffers the high-pressure splashes generated during processing, especially at the moment of hole penetration. It converts the jet kinetic energy into laminar flow guidance, reducing oil mist generation and significantly improving the chamber contamination problem caused by pressure changes in traditional processing. The device employs a dual-circulation cooling system design, with the oil inlet pipe positioned high to form a waterfall-like cooling effect, and the oil return pipe positioned low to form a directional return flow in conjunction with the anti-splash ramp. This layout is particularly effective when processing through holes in thin-walled parts. At the moment of hole penetration, the system can control temperature fluctuations within ±5°C in a very short time through a pressure self-balancing mechanism (patented technology).

[0049] The anti-splash oil return cooling device disclosed in this invention buffers the high-pressure splash during the cooling process by setting an anti-splash ramp in the housing. The oil inlet and return pipes increase the instantaneous temperature difference and flow balance of the external cooling circulation in the thin-walled through hole of the part, and can better remove the built-up edge, prevent the part from burning, and improve the cooling effect.

[0050] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A splash-proof oil return cooling device, characterized in that, It includes a housing (13), an oil inlet pipe (1), an oil return pipe (2), a machining hole (9), and a splash guard (10); the machining hole (9) is located at one end of the housing (13) and is opposite to the machining spindle; the splash guard (10) is inclinedly arranged inside the other end of the housing (13), with one end of the splash guard (10) forming an angle with the bottom of the housing (13) and the other end connected to the upper side of the other end of the housing (13); one end of the oil inlet pipe (1) is connected to the upper part of one side of the housing (13); one end of the oil return pipe (2) is connected to the lower part of the other side of the housing (13); Several overflow holes (11) are provided at the bottom of the other end of the box (13); The bottom surface of the housing (13) is provided with a cooling groove (14); the cooling groove (14) is opposite to the oil return pipe (2); The upper part of the box (13) is provided with a sliding cover (12). The oil inlet pipe (1) is connected to the housing (13) through the external thread (3) and the internal thread (4) of the oil return pipe; The external thread (3) of the return oil pipe is provided on the outer surface of the inlet oil pipe (1); the internal thread (4) of the return oil pipe is provided on the side of the housing (13); The return oil pipe (2) is connected to the housing (13) through the external thread (5) and the internal thread (6) of the inlet oil pipe; The external thread (5) of the oil inlet pipe is provided on the outer surface of the oil return pipe (2); the internal thread (6) of the oil inlet pipe is provided on the side of the housing (13); The other end of the oil inlet pipe (1) is connected to the cooling oil circuit; the other end of the oil return pipe (2) is connected to the oil return tank.

2. The anti-splash oil return cooling device according to claim 1, characterized in that, The sliding cover (12) is slidably connected to the upper part of the box (13) via a sliding device; the sliding device includes a first slide rail (7) and a second slide rail (8); the first slide rail (7) and the second slide rail (8) are arranged opposite to each other on the upper part of the box (13); the two sides of the sliding cover (12) are respectively embedded in the first slide rail (7) and the second slide rail (8).

3. The anti-splash oil return cooling device according to claim 1, characterized in that, The machining hole (9) is square.

4. The method of using the anti-splash oil return cooling device as described in any one of claims 1 to 3, characterized in that, Includes the following steps: Cooling oil is used to cool the workpiece at the machining hole (9) through the oil inlet pipe (1). The high-pressure splash generated during cooling is slowed down by the anti-splash ramp (10). Then the cooling oil at the bottom of the box (13) is discharged through the oil return pipe (2).

Images