Anti-splashing return oil cooling device and method

Abstract

The invention discloses an anti-splashing return oil cooling device and method, and belongs to the technical field of blind hole machining. According to the anti-splashing return oil cooling device disclosed by the invention, the anti-splashing slope is arranged in the box body to buffer high-pressure splashing in the cooling process, so that the technical problems of cabin pollution, oil mist formation and environmental pollution caused by splashing cooling oil mist due to high-pressure spraying caused by non-uniform pressure of the cooling oil during instant hole communication can be solved; meanwhile, the oil inlet pipe and the oil return pipe are arranged, so that the instantaneous balance temperature difference and the balance flow of external cooling circulation in the thin-wall through hole of the part are increased, built-up edges can be better taken away, the part is prevented from being ablated, and the cooling effect is better improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of blind hole machining, and particularly relates to an anti-splash oil return cooling device and method. Background Art

[0002] Deep hole machining refers to a hole series machining process where the ratio of hole depth to hole diameter (L / D) is greater than 6. When the machining hole depth exceeds 10 times the diameter, it belongs to the category of typical deep hole machining. As a special processing equipment, the core feature of a CNC deep hole drilling machine is that its tool cooling system adopts an internal cooling design, and the coolant reaches the internal cooling method of the cutting area directly through the central through hole of the spindle. There are two significant technical difficulties in this process: First, the cutting heat conduction efficiency is low. Due to the excessive length-diameter ratio of the tool and being surrounded by the machined material, heat is difficult to dissipate through conventional channels. Second, the chip discharge channel is long, and chip retention is extremely likely to occur. During deep hole machining, due to the structural characteristics of the tool bar system with an excessive slenderness ratio (usually L / D > 20), the following processing problems are exacerbated: 1) The extended heat conduction path increases the temperature gradient in the cutting area, and the average temperature of the tool rake face can reach 800 - 1000 °C; 2) As the hole depth increases, the probability of the chip experiencing secondary cutting during the discharge process increases significantly, promoting the formation of built-up edge (BUE). The periodic generation and peeling of the built-up edge will deteriorate the surface roughness of the machined surface (the Ra value increases by 0.8 - 1.6 μm), and at the same time cause cutting force fluctuations (the amplitude can reach 20 - 30%).

[0003] To solve the above problems, modern deep hole machining equipment generally adopts a high-pressure cooling system (HPC), whose working pressure usually reaches 7 - 15 MPa and the flow rate is maintained at 60 - 120 L / min. Although this forced cooling method can effectively reduce the cutting temperature (which can be controlled below 600 °C on the rake face), it will cause serious hydrodynamic problems: 1) After the high-pressure jet impacts the workpiece surface, an atomization effect is formed, generating oil mist particles with a particle size less than 5 μm (PM5); 2) The coolant splash results in a loss of effective cooling flow rate of 15 - 25%, causing local cooling insufficiency and workpiece surface burns (manifested as a 20 - 30 HV decrease in microhardness). From the perspective of occupational health and environmental protection, this processing method has double hazards: 1) The oil mist emission concentration exceeds the OSHA regulation limit of 5 mg / m³, and long-term exposure will cause respiratory system diseases in operators; 2) The coolant containing extreme pressure additives (such as sulfur and chlorine) degrades to produce benzene derivatives, causing soil pollution. Currently, the industry is addressing these challenges through technical solutions such as developing fully enclosed processing cabins (isolation efficiency > 98%), electrostatic oil mist collection systems (collection efficiency 90 - 95%), and biodegradable coolants (degradation rate > 85%).

[0004] Although deep hole machining equipment has a certain degree of versatility and can meet the machining requirements for different hole diameters (Ø5 - 50mm) and hole depths (100 - 2000mm), due to the diversity of on-site production conditions, its design often requires a trade-off between versatility and specificity, inevitably resulting in certain technical deficiencies. For example, when machining high-hardness materials (such as quenched steel, superalloys), due to the increase in cutting force and heat load, the rigidity of a general-purpose deep hole drilling machine may be insufficient, leading to an increase in the tool runout, which affects the positional accuracy of the hole (the deviation can reach 0.05 - 0.1mm). In addition, in the face of different workpiece materials (such as aluminum alloy, stainless steel, titanium alloy, etc.), cutting parameters (such as feed rate, spindle speed) and coolant pressure need to be frequently adjusted, but the control system of general equipment often cannot achieve rapid adaptive optimization, resulting in a 10 - 20% reduction in machining efficiency. At the same time, due to the particularity of deep hole machining, the equipment structure usually adopts a modular design, such as adjustable guiding supports, multi-stage filtering and chip removal systems, etc., but these modules may have compatibility problems when adapting to different machining scenarios. For example, when machining small-diameter deep holes (Ø < 10mm), the high-pressure cooling system may have insufficient flow rate (< 30L / min), and when machining large-diameter deep holes (Ø > 30mm), the chip removal channel may be blocked due to chip accumulation. In addition, the protection system of general equipment often cannot fully cover the oil mist splash range under different working conditions, resulting in excessive oil mist concentration (> 10mg / m³) in local areas, further exacerbating environmental pollution and health risks; therefore, although deep hole drilling machines strive for generalization in design, in the actual production process, it is still necessary to optimize them according to specific machining requirements (such as material properties, machining accuracy, batch size, etc.), or even adopt customized solutions to make up for the performance deficiencies of general equipment under specific working conditions. Summary of the Invention

[0005] The purpose of the present invention is to provide a splash-proof oil-return cooling device and method to solve the technical problem that the existing cooling device has poor cooling effect due to splashing.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: The present invention discloses a splash-proof oil-return cooling device, including a box body, an inlet oil pipe, a return oil pipe, a machining hole, and a splash-proof slope; the machining hole is opened at one end of the box body, opposite to the machining spindle; the splash-proof slope is inclined inside the other end of the box body, one end of the splash-proof slope forms an angle with the bottom of the box body, and the other end is connected to the upper side edge of the other end of the box body; one end of the inlet oil pipe is connected to the upper part of one side surface of the box body; one end of the return oil pipe is connected to the lower part of the other side surface of the box body.

[0007] Furthermore, a plurality of overflow holes are opened at the bottom of the other end of the box body.

[0008] Further, a cooling groove is provided on the bottom surface of the box body; the cooling groove faces the oil return pipe.

[0009] Further, the inlet pipe is connected to the box body through an external thread of the oil return pipe and an internal thread of the oil return pipe; The external thread of the oil return pipe is arranged on the outer surface of the inlet pipe; the internal thread of the oil return pipe is arranged on the side surface of the box body.

[0010] Further, the oil return pipe is connected to the box body through an external thread of the inlet pipe and an internal thread of the inlet pipe; The external thread of the inlet pipe is arranged on the outer surface of the oil return pipe; the internal thread of the inlet pipe is arranged on the side surface of the box body.

[0011] Further, a sliding cover is provided on the upper part of the box body.

[0012] Further, the sliding cover is slidably connected to the upper part of the box body through 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 oppositely arranged on the upper part of the box body; both sides of the sliding cover are respectively embedded in the first slide rail and the second slide rail.

[0013] Further, the other end of the inlet pipe is connected to a cooling oil circuit; the other end of the oil return pipe is connected to an oil return tank.

[0014] Further, the processing hole is square.

[0015] The present invention also discloses a use method of the above anti-splash oil return cooling device, including the following steps: Cool the workpiece at the processing hole with cooling oil through the inlet pipe. The high-pressure splash generated during cooling is slowed down by the anti-splash slope, and then the cooling oil at the bottom of the box body is discharged through the oil return pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses an anti-splash oil return cooling device. By providing an anti-splash slope in the box body to buffer the high-pressure splash during the cooling process, it can solve the technical problems that the cooling oil pressure is uneven and high-pressure ejected instantaneously when the hole is opened, causing cabin pollution, forming oil mist, and the splashing cooling oil mist will not only pollute the environment; at the same time, the provided inlet pipe and oil return pipe increase the instantaneous balance of temperature difference and balance the flow rate in the external cooling cycle of the thin-walled through hole of the part, and can better carry away the built-up edge, prevent part ablation, and better improve the cooling effect.

[0017] Furthermore, a number of overflow holes are provided at the bottom, which can better collect the cooling oil, alleviate the backflow of the cooling oil, prevent the oil from causing environmental pollution, facilitate the reuse of the cooling oil, bring economic benefits, and greatly reduce the bionics of the oil mist phenomenon, collect the cooling oil, alleviate the backflow of the cooling oil, prevent the oil from causing environmental pollution, and facilitate the reuse of the cooling oil, bringing economic benefits.

[0018] Furthermore, the provision of the slidable cover plate facilitates the disassembly and replacement of different types of tooling, contributing to the improvement of work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the anti-splash oil-return cooling device of the present invention; Figure 2 is a front view of the anti-splash oil-return cooling device of the present invention; Figure 3 is a top view of the anti-splash oil-return cooling device of the present invention; Figure 4 is a left view of the anti-splash oil-return cooling device of the present invention; Wherein: 1 - inlet pipe; 2 - return pipe; 3 - external thread of the return pipe; 4 - internal thread of the return pipe; 5 - external thread of the inlet pipe; 6 - internal thread of the inlet pipe; 7 - first slide rail; 8 - second slide rail; 9 - processing hole; 10 - anti-splash slope; 11 - overflow hole; 12 - sliding cover; 13 - box body; 14 - cooling tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings: Referring to Figures 1-4 , the present invention discloses a splash-proof oil return cooling device, including a box body 13, an oil inlet pipe 1, an oil return pipe 2, a processing hole 9, and a splash-proof slope 10; the processing hole 9 is opened at one end of the box body 13 and is opposite to the processing spindle; the splash-proof slope 10 is inclined inside the other end of the box body 13, one end of the splash-proof slope 10 forms an angle with the bottom of the box body 13, and the other end is connected to the upper side edge of the other end of the box body 13; one end of the oil inlet pipe 1 is connected to the upper part of one side surface of the box body 13; one end of the oil return pipe 2 is connected to the lower part of the other side surface of the box body 13, and the shape of the processing hole 9 can be square; 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 arranged 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.

[0023] Preferably, a plurality of overflow holes 11 are opened at the bottom of the other end of the box body 13, which are aligned with the spindle end and can quickly discharge the cooling oil.

[0024] Preferably, the oil inlet pipe 1 and the oil return pipe 2 are respectively connected to the box body 13 through connectors; the connectors are an external thread 3 of the oil return pipe, an internal thread 4 of the oil return pipe, an external thread 5 of the oil inlet pipe, and an internal thread 6 of the oil inlet pipe. The oil inlet pipe 1 is connected to the box body 13 through the external thread 3 of the oil return pipe and the internal thread 4 of the oil return pipe; the external thread 3 of the oil return pipe is arranged on the outer surface of the oil inlet pipe 1; the internal thread 4 of the oil return pipe is arranged on the side surface of the box body 13; the oil return pipe 2 is connected to the box body 13 through the external thread 5 of the oil inlet pipe and the internal thread 6 of the oil inlet pipe; the external thread 5 of the oil inlet pipe is arranged on the outer surface of the oil return pipe 2; the internal thread 6 of the oil inlet pipe is arranged on the side surface of the box body 13; the cooperation of the internal and external threads here facilitates the installation or disassembly of the oil inlet pipe 1 and the oil return pipe 2, which is beneficial to later maintenance.

[0025] Preferably, the sliding cover 12 is slidably connected to the upper part of the box body 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 oppositely arranged on the upper part of the box body 13; both 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 is convenient for replacing the workpiece.

[0026] Preferably, a cooling groove 14 is opened on the bottom surface of the box body 13; the cooling groove 14 is opposite to the oil return pipe 2 and can more efficiently and quickly discharge the coolant from the oil return pipe 2.

[0027] Embodiment 1 The anti-splash oil return cooling device disclosed in this embodiment includes a box body 13, an inlet pipe 1, a return pipe 2, a processing hole 9, and an anti-splash slope 10; the processing hole 9 is opened at one end of the box body 13 and is opposite to the processing spindle; the anti-splash slope 10 is inclined inside the other end of the box body 13, one end of the anti-splash slope 10 forms an angle with the bottom of the box body 13, so that the coolant impacting the box wall at high speed flows downward along the slope instead of directly splashing outside the processing area, and the other end is connected to the upper side edge of the other end of the box body 13; the slope structure can reduce the impact speed of the coolant and reduce the atomization phenomenon (the generation amount of PM5 particles is reduced by more than 50%), meeting the occupational health standards; one end of the inlet pipe 1 is connected to the upper part of one side surface of the box body 13, so that the coolant covers the processing area in a waterfall manner to ensure the priority cooling of the contact area between the tool and the workpiece; one end of the return pipe 2 is connected to the lower part of the other side surface of the box body 13, and together with the slope, it forms a "high-in and low-out" circulation path, quickly taking away the cutting heat (the heat exchange efficiency is increased by 15%), preventing the workpiece from being ablated due to heat accumulation (the surface hardness fluctuation is reduced to ±5HV).

[0028] Embodiment 2 The anti-splash oil return cooling device disclosed in this embodiment includes a box body 13, an inlet pipe 1, a return pipe 2, a processing hole 9, and an anti-splash slope 10; the processing hole 9 is opened at one end of the box body 13 and is opposite to the processing spindle; the anti-splash slope 10 is inclined inside the other end of the box body 13, one end of the anti-splash slope 10 forms an angle with the bottom of the box body 13, and the other end is connected to the upper side edge of the other end of the box body 13; one end of the inlet pipe 1 is connected to the upper part of one side surface of the box body 13; one end of the return pipe 2 is connected to the lower part of the other side surface of the box body 13; and a plurality of overflow holes 11 are opened at the bottom of the other end of the box body 13 to prevent the coolant from accumulating excessively, maintain the liquid level stability in the box, promote the separation of chips and coolant, reduce pipeline blockage, enhance system compatibility, adapt to different processing conditions, optimize the heat exchange efficiency, and avoid local overheating.

[0029] Embodiment 3 The anti-splash oil return cooling device disclosed in this embodiment includes a box body 13, an inlet pipe 1, a return pipe 2, a processing hole 9, and an anti-splash slope 10; the processing hole 9 is opened at one end of the box body 13 and is opposite to the processing spindle; the anti-splash slope 10 is inclined inside the other end of the box body 13, one end of the anti-splash slope 10 forms an angle with the bottom of the box body 13, and the other end is connected to the upper side edge of the other end of the box body 13; one end of the inlet pipe 1 is connected to the upper part of one side surface of the box body 13; one end of the return pipe 2 is connected to the lower part of the other side surface of the box body 13; and a plurality of overflow holes 11 are opened at the bottom of the other end of the box body 13; a sliding cover 12 is arranged on the upper part of the box body 13; the sliding cover 12 is slidably connected to the upper part of the box body 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 oppositely arranged on the upper part of the box body 13; both sides of the sliding cover 12 are respectively embedded in the first slide rail 7 and the second slide rail 8, which can provide a convenient operation and observation window, realize dynamic sealing and splash suppression, and is convenient for maintenance and cleaning. More importantly, it can improve safety.

[0030] Embodiment 4 The anti-splash oil return cooling device in this embodiment includes an inlet pipe 1 and a return pipe 2. One end of the inlet pipe 1 is connected to the box body 13, and the other end is connected to the cooling oil circuit branch. One end of the return pipe 2 is connected to the box body 13, and the other end is connected to the return oil tank; a square processing hole 9 is opened at the end of the device close to the spindle end, and an anti-splash slope 10 is designed inside the device, and an overflow hole 11 is opened directly opposite the spindle end; an external thread 5 of the inlet pipe and an internal thread 6 of the inlet pipe fix the inlet pipe 1, and an external thread 3 of the return pipe and an internal thread 4 of the return pipe fix the return pipe 2; the cooperation of the internal and external threads facilitates the installation or disassembly of the inlet pipe 1 and the return pipe 2, which is beneficial to later maintenance; a flow regulating valve is installed on the branch of the 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 cooperate with the sliding cover 12 to move, which is convenient for replacing the workpiece.

[0031] Embodiment 5 When using the anti-splash oil return cooling device disclosed in the present invention for processing and cooling, during use, the large-area splash of the coolant is controlled by the entire shell of the box body 13, the workpiece is cooled through the inlet pipe 1, the oil splash generated during cooling is slowed down by the anti-splash slope 10, drained to the return pipe 2 through the cooling groove 14, and introduced into the cooling oil tank. The return pressure is slowed down through the overflow holes 11. During use, the processing parts can be quickly replaced through the cooperation of the first slide rail 7 and the second slide rail 8.

[0032] The anti-splash oil return cooling device disclosed in the present invention has a fluid dynamics design of an anti-splash slope, which converts the impact kinetic energy of high-pressure coolant into laminar flow along the slope. Compared with the traditional vertical baffle structure, the amount of oil mist generated is reduced and the amount of coolant reflux is increased. The angle formed with the bottom of the box can guide the coolant to flow to the return oil pipe 2 in a directional manner to avoid deposition caused by eddy currents. At the same time, the coordinated drainage setting of the overflow hole 11 and the cooling groove 14 prevents hydraulic overrun in the box. The corrugated groove design of the cooling groove 14 increases the heat exchange area, allowing the high-temperature coolant to cool down quickly. The double slide rail system setting of the slide cover 12 realizes one-handed operation and is convenient for observing the processing depth. The threaded connection between the oil inlet pipe 1 and the return oil pipe 2 can improve the connection strength and facilitate disassembly. The return oil pipe 2 can be integrated with a flow sensor to monitor the cleanliness of the coolant in real time.

[0033] The anti-splash oil return cooling device disclosed in the present invention can solve the problem that has always existed in the blind hole processing of a key component of an aircraft engine. When the hole is opened instantly, the cooling oil pressure is uneven and high-pressure is ejected, causing cabin pollution and forming oil mist. The splashing cooling oil mist not only pollutes the environment, but also causes irreversible health hazards to those who come into contact with it. At the same time, the external cooling circulation is added to address the problem of slender and poor rigidity of the tool rod, which can effectively improve the life of the drill bit, and the external cooling circulation is added to instantly balance the temperature difference and flow rate of the thin-walled through hole of the part, and can better take away the built-up edge and prevent the part from being burned. In addition, the cooling oil is collected, the reflux of the cooling oil is alleviated, and the oil is prevented from causing environmental pollution, which is conducive to the reuse of the cooling oil and has economic benefits. There is no delay in entering the processing cabin to replace parts until the oil mist is dispersed, which greatly improves the processing efficiency. Its core innovation lies in the anti-splash slope structure set in the box. The slope adopts an optimized inclination angle design of 30-45°, which can effectively buffer the high-pressure splash generated during the processing, especially when the hole is penetrated, and convert the spray kinetic energy into laminar flow guidance, so as to reduce the amount of oil mist generated, and significantly improve the cabin contamination problem caused by pressure mutation in traditional processing; the device adopts a double-circulation cooling system design, the oil inlet pipe is arranged at a high position to form a waterfall-style covering cooling, and the return oil pipe is set at a low position to form a directional reflux with the anti-splash slope. This layout is particularly effective when processing through holes in thin-walled parts. When the hole is penetrated, the system can control the temperature difference fluctuation within ±5℃ in a very short time through the pressure self-balancing mechanism (patented technology).

[0034] The anti-splash oil return cooling device disclosed in the present invention arranges an anti-splash slope in a box body to buffer the high-pressure splashing during the cooling process. The oil inlet pipe and the oil return pipe are arranged to increase the external cooling cycle to balance the instantaneous temperature difference and flow rate of the thin-wall through holes of the parts, and can better remove the built-up edge, prevent the parts from being burned, and better improve the cooling effect.

[0035] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution in accordance with the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. An anti-splash oil return cooling device, characterized in that: The invention comprises a casing (13), an oil inlet pipe (1), an oil return pipe (2), a processing hole (9) and an anti-splash slope (10); the processing hole (9) is formed at one end of the casing (13) and is opposite to the processing spindle; the anti-splash slope (10) is arranged obliquely inside the other end of the casing (13); one end of the anti-splash slope (10) forms an angle with the bottom of the casing (13), and the other end is connected to the upper side of the other end of the casing (13); one end of the oil inlet pipe (1) is connected to the upper part of one side of the casing (13); and one end of the oil return pipe (2) is connected to the lower part of the other side of the casing (13).

2. The anti-splash oil return cooling device according to claim 1, characterized in that: A plurality of overflow holes (11) are provided at the bottom of the other end of the box body (13).

3. The anti-splash oil return cooling device according to claim 1, characterized in that: A cooling groove (14) is provided on the bottom surface of the box body (13); the cooling groove (14) is opposite to the oil return pipe (2).

4. The anti-splash oil return cooling device according to claim 1, characterized in that: The oil inlet pipe (1) is connected to the box body (13) via an outer oil return pipe thread (3) and an inner oil return pipe thread (4); The oil return pipe outer thread (3) is arranged on the outer surface of the oil inlet pipe (1); and the oil return pipe inner thread (4) is arranged on the side of the box body (13).

5. The anti-splash oil return cooling device according to claim 1, characterized in that: The oil return pipe (2) is connected to the box body (13) via the oil inlet pipe external thread (5) and the oil inlet pipe internal thread (6); The external thread (5) of the oil inlet pipe is arranged on the outer surface of the oil return pipe (2); and the internal thread (6) of the oil inlet pipe is arranged on the side of the box body (13).

6. The anti-splash oil return cooling device according to claim 1, characterized in that: A sliding cover (12) is provided on the upper portion of the box body (13).

7. The anti-splash oil return cooling device according to claim 6, characterized in that: The sliding cover (12) is slidably connected to the upper part of the box body (13) via a sliding device; the sliding device comprises a first sliding rail (7) and a second sliding rail (8); the first sliding rail (7) and the second sliding rail (8) are arranged opposite to each other on the upper part of the box body (13); and both sides of the sliding cover (12) are respectively embedded in the first sliding rail (7) and the second sliding rail (8).

8. The anti-splash oil return cooling device according to claim 1, characterized in that: 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.

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

10. A method for using the anti-splash oil return cooling device according to any one of claims 1 to 9, characterized in that: The following steps are involved: The cooling oil is passed through the oil inlet pipe (1) to cool the workpiece at the processing hole (9). The high-pressure splash generated during cooling is mitigated by the anti-splash slope (10), and then the cooling oil at the bottom of the box (13) is discharged through the oil return pipe (2).

Images