Deburring cutter for crossed oil ducts of engine

Abstract

The utility model provides an engine cross oil duct deburring tool which comprises a tool body and a tool bit, the tool bit is connected to one end of the tool body, two oppositely arranged cutting edges are arranged on the tool bit, a cutting groove is formed between the cutting edges, at least one flushing hole is formed in the cutting groove, and the flushing hole is communicated with the tool body. An inner cooling hole is formed in the cutter body and communicated with the flushing hole. Compared with a deburring brush, the cutter is additionally provided with the inner cooling hole and the flushing hole, so that the cutting edge of the cutter is promoted to annularly cut around the hole wall, and meanwhile, the removed burrs can be flushed to the front end until the burrs are flushed out from an oil duct outlet at the other end, so that burr residues are avoided, the workpiece cleaning difficulty is reduced, and the cleanliness of the cylinder body is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of engine processing, in particular to a deburring tool for an engine cross oil channel. Background Art

[0002] Cutting castings is prone to burrs and flanging at the intersection of two surfaces, especially at the T-shaped openings of intersecting holes, which are prone to burrs that flanging into the hole wall. The complex internal oil circuits of cylinder blocks contain multiple deep intersecting oil holes, and burrs generated during machining are typically removed by repeatedly scrubbing with a wire brush.

[0003] Due to the strong rigidity of cast iron, wire brushes often fail to thoroughly remove burrs, leaving burrs that remain and severely impacting oil channel cleanliness. Furthermore, wire brushes are prone to falling wire after a certain lifespan, becoming lodged in the oil channel. Consequently, residual burrs and wires pose a risk of falling during engine piston operation, leading to serious consequences such as cylinder scuffing, crankshaft seizure, and scratches on the piston bore. Furthermore, the use of specialized deburring brushes requires the design of a dedicated roller conveyor, which involves significant production line modifications and has limited universal applicability. Summary of the Invention

[0004] The utility model aims to provide an engine cross oil channel deburring tool, aiming to solve the problems of burr residue, brush wire falling and jamming, which affect the cleanliness of oil channels / various cast iron parts holes.

[0005] The utility model is implemented as follows: a deburring tool for an engine cross oil channel comprises a tool body and a tool head, wherein the tool head is connected to one end of the tool body, two oppositely arranged cutting edges are provided on the tool head, a cutting groove is provided between the cutting edges, at least one flushing hole is provided in the cutting groove, an inner cooling hole is provided inside the tool body, and the inner cooling hole is communicated with the flushing hole.

[0006] A further technical solution of the present invention is that the coolant of the flushing hole is sprayed in a direction toward the hole wall and the cutting edge of the cutting blade.

[0007] A further technical solution of the present invention is that a chip removal groove is provided along the surface of the cutter body, and the chip removal groove is communicated with the cutting groove.

[0008] A further technical solution of the present invention is that the included angle between the flushing hole and the inner cooling hole is 45°.

[0009] A further technical solution of the present invention is that the included angle between the flushing hole and the inner cooling hole is 60°.

[0010] A further technical solution of the present invention is that the diameter of the inner cooling hole is less than or equal to 0.2 mm.

[0011] A further technical solution of the present invention is that the single-side tool clearance between the cutting edge and the hole wall is less than or equal to 0.05 mm.

[0012] A further technical solution of the present invention is that the cutter head and the cutter body are connected by welding.

[0013] The beneficial effects of the utility model are as follows: the tool has the additional internal cooling hole and flushing hole compared to the deburring brush, which can promote the cutting edge of the tool to cut around the hole wall while flushing the removed burrs to the front end until they are flushed out from the oil channel outlet at the other end, thereby avoiding burr residue, reducing the difficulty of workpiece cleaning, and further improving the cleanliness of the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall diagram of the tool of the utility model;

[0015] Figure 2 It is a side view of the tool of the utility model;

[0016] Figure 3 It is a schematic diagram of the positional relationship between the internal coolant hole and the flushing hole in the tool of the present invention.

[0017] Reference numerals: 1 - tool body, 2 - tool head, 3 - cutting blade, 4 - cutting groove, 5 - flushing hole, 6 - chip groove, 7 - internal coolant hole. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] Figure 1-3 The utility model shows an engine cross oil channel deburring tool provided by the present invention, comprising a tool body 1 and a tool head 2. The tool head 2 is connected to one end of the tool body 1. Two oppositely arranged cutting edges 3 are provided on the tool head 2. A cutting groove 4 is provided between the cutting edges 3. At least one flushing hole 5 is provided in the cutting groove 4. An internal cooling hole 7 is provided inside the tool body 1, and the internal cooling hole 7 is connected to the flushing hole 5.

[0020] Preferably, the coolant spraying direction of the flushing hole 5 is toward the hole wall and the edge of the cutting blade 3.

[0021] Preferably, a chip removal groove 6 is provided along the surface of the cutter body 1 , and the chip removal groove 6 is communicated with the cutting groove 4 .

[0022] Preferably, the included angle between the flushing hole 5 and the inner cooling hole 7 is 45°.

[0023] Preferably, the included angle between the flushing hole 5 and the inner cooling hole 7 is 60°.

[0024] Preferably, the diameter of the inner cooling hole 7 is less than or equal to 0.2 mm.

[0025] Preferably, the single-side tool clearance between the cutting edge 3 and the hole wall is less than or equal to 0.05 mm.

[0026] Preferably, the cutter head 2 and the cutter body 1 are connected by welding.

[0027] The utility model discloses a design method for a deburring tool for an engine cross oil passage. According to the design standard for the tool for machining the aperture of the main oil passage of the product, the maximum cutting diameter of the deburring tool is designed. The deburring tool is offset during rotation, so that the tool circumferentially removes burrs in the hole. The coolant impact reaction force and the speed feed parameters during the tool rotation are designed, and the tool rotation offset correction coefficient is determined. The offset distance is related to the speed, cutting force and acting force during the tool machining process. The calculation formula for the offset is:

[0028] a=Rk1,k1=k F +k S +k0

[0029] The offset correction coefficient k1 is determined by the rotational speed, cutting force and action force. In the deburring process, the cutting amount is very small, the cutting force can be ignored, and its influence on k1 can be ignored, so k0 is set to 0, and the offset coefficient k S Depends on the machining speed, tool diameter and tool aspect ratio, k F The value of depends on the magnitude of the radial external force on the tool;

[0030] During the process of cutting fluid ejection, according to the principle of constant total flow in hydraulics, there is a jet reaction force at the flushing hole 5. The internal coolant jet reaction force on the tool can be calculated using the fluid momentum equation:

[0031]

[0032] During the processing, the equipment liquid supply system is stable, so the momentum correction coefficient α can be taken as 1. From the projection angle, the reaction force received by the flushing hole 5 when spraying in the horizontal position is:

[0033]

[0034] According to the continuity equation of fluid, we can get:

[0035] v1A1=v2A2

[0036] The diameter of the tool internal coolant hole 7 ports and the orifice are consistent, that is, v1 = v2, q v The flow rate is determined by the velocity in the equipment's liquid supply pipe and the cross-sectional area of ​​the internal cooling hole 7:

[0037] q v =3600πr 2 V

[0038] Common cutting fluid density on machine tools ρ=1100Kg / m 3 , the pressure is P = 10 bar, and the radius of the tool inner coolant hole 7 is designed to be r mm. Then the water velocity when the inner coolant hole 7 sprays the cutting fluid is calculated as follows:

[0039]

[0040] That is, the flow velocity V in the inner coolant hole 7. Combining the above formula, the injection reaction force on the inner coolant hole 7 of the tool is:

[0041]

[0042] If the flushing hole 5 of the cutting edge 3 is designed with different liquid outlet angles, the tool will be subjected to the resultant axial force of the jet reaction force:

[0043] F r =F1cosα1-F2cosα2

[0044] At the same time, the time that the liquid column ejected from the orifice hits the inner wall of the hole is very short. The force exerted by the liquid column on the tool can be calculated using Newton's second law:

[0045] F3=Δm*Δv / Δt

[0046] Using the fluid mechanics formula, the coolant contact time of the hole wall can be calculated:

[0047]

[0048] Taking the cross section of flushing hole 5 as the reference plane, the time from the spraying of coolant at the hole mouth to the coolant contacting the hole wall is Calculate Δt, and the instantaneous reaction force exerted by the inner wall on the liquid column is:

[0049] F3=Δm*Δv / Δt=ρSΔLΔv / Δt

[0050] α1 and α2 are the angles between the flushing hole 5 and the internal cooling hole 7. F3 is calculated and then the radial force F is calculated. r , then corresponding to the empirical coefficient, the radial force F is obtained rThe offset coefficient k f , and then the maximum possible value of the offset correction coefficient k1 is obtained. According to the limit state measurement, the deburring offset a=Rk1 of the tool size is obtained. Therefore, the designed cutting diameter of the tool is 2×(R+a), which is the orbital diameter of the deburring tool.

[0051] This utility model provides an engine cross-channel deburring tool. By analyzing machining processes and optimizing the deburring strategy based on the direction of burrs in oil channels and internal cross-holes within components, this tool eliminates the need for wire brushes and mitigates the risk of brush wire drop. The newly designed tool, with its carbide cutting edge, thoroughly removes burrs. Furthermore, this tool only requires adding this processing capability to the CNC machining center, eliminating the cost and risk of production line modifications.

[0052] This specialized deburring tool design has been used in the OP110 process of the S15DHE engine cylinder block line in the machining workshop of Liuzhou Saike Technology Development Co., Ltd., and has achieved remarkable deburring results in actual production. The tool design process is as follows:

[0053] (1) The design considers using an eccentric force on the tool so that the tool edge revolves around the inner wall of the cross oil channel hole during processing to remove burrs.

[0054] (2) Analyze the force applied to the tool during machining: During normal machining, the tool is subject to the reaction force of the cutting fluid flushing outward from the internal coolant pipe, as well as the eddy current lateral force generated by the cutting fluid when the tool rotates (this force is negligible because the main oil channel is a through hole). At this time, the tool, which is subject to the reaction force of the fluid, will rotate around the turret spindle and simultaneously revolve, i.e., it will cut the burrs facing the main oil channel along the hole wall.

[0055] The following is an example of an example to introduce the force analysis of the tool design process.

[0056] According to the commonly used cutting fluid density on machine tools, ρ≈1100Kg / m 3 , the pressure is P = 10bar, and the diameter of the tool inner coolant hole 7 is designed to be 0.2mm. Then the water velocity when the inner coolant hole 7 sprays the cutting fluid is According to Newton's second law, F=Δm*Δv / Δt, the time for the cutting fluid to be ejected from the orifice is very short. According to the fluid mechanics formula, For the convenience of calculation, the cross section of flushing hole 5 is used as the reference plane. The time from the spraying of coolant at the hole mouth to the coolant contacting the hole wall is The calculation results show that Δt = 0.0012 × 10 -3 S, then the instantaneous reaction force generated by the inner wall on the liquid column is F = Δm*Δv / Δt = ρSΔRΔv / Δt = (1100kg / m 3)*π*(0.0001m) 2 *

[0057] 0.05×10 -3 m*42.68m / s÷0.0012×10 -3 S≈0.0632N can be ignored. In the process of cutting fluid ejection, according to the principle of constant total flow in hydraulics, there is a jet reaction force on the flushing hole 5. The jet reaction force is based on the momentum equation of constant total flow: During the machining process, the equipment fluid supply system is relatively stable, so the momentum correction coefficient α can be approximately taken as 1. From the projection point of view, the reaction force received by the cutting fluid orifice when it is sprayed in a horizontal position is: According to the continuity equation of fluid, we can get:

[0058] v1A1=v2A2, the diameter of the coolant hole 7 in the tool is the same as that of the orifice, that is, v1=v2=42.68m / s. v It can be calculated as 0.005m 3 / h, then the injection reaction force F = 234.74N.

[0059] During the rotation of the tool, a rotation offset will be generated. The offset distance is related to the tool speed, cutting force, and force during the machining process. The calculation formula for the offset is: a = Rk1, where the offset correction coefficient k1 = k F +k S +k0. According to the experience of tool cutting manual, at a speed of 2000-3000 (r·min -1 ) below, diameter The deflection coefficient of carbide tools with an aspect ratio of 15-25 is 2×10 -3 If the cutting fluid jet reaction factor is added to this design, the trajectory deviation coefficient will be higher when the tool rotates. The tool is subjected to the resultant force F in the axial direction of the jet reaction force. r =F1cosα1-F2cosα2, taking α1=45°, α2=60°, the radial resultant force F is calculated r =48.62N.

[0060] Then the corresponding empirical coefficient is the radial force F r The offset coefficient k f =12×10 -3 , so the maximum offset correction coefficient k1 can be 14×10 -3 , according to the limit state calculation, the tool size The deburring offset a=Rk1=5.95×14×10 -3=0.083mm. Therefore, the designed cutting diameter of the tool is 2×(R+a)=12.067mm, which is the deburring revolution diameter.

[0061] The tool provided by the utility model has the additional inner cooling hole 7 and the flushing hole 5 compared with the deburring brush. While promoting the cutting edge of the tool to cut around the hole wall, the removed burrs can be flushed to the front end until they are flushed out from the oil channel outlet at the other end, avoiding burr residue, reducing the difficulty of workpiece cleaning, and further improving the cleanliness of the cylinder body.

[0062] This specialized tool design has been implemented at the machining plant of Liuzhou Saike Technology Development Co., Ltd., where it is used for deburring the main oil passages in cylinder block production. Production tracking has demonstrated a significant improvement in cylinder block oil passage cleanliness, effectively resolving the difficulty in removing burrs during machining of complex oil passage cross-holes within the cylinder block. This further improves cylinder block cleanliness and prevents serious consequences such as cylinder scuffing, crankshaft seizure, and piston bore scratches caused by residual burrs falling from the engine piston during operation. The tool design and manufacturing are relatively simple, further reducing production costs. The tool's cutting edge is solely responsible for burr removal, minimizing cutting wear on the carbide insert, further extending tool life. The tool shank is made of high-speed steel, reducing the risk of alloy collisions during machining and significantly enhancing the tool's universality.

[0063] Since the deburring method using a wire brush has been eliminated, the risk of product quality problems caused by the brush wire falling off is eliminated when the product is working. Using a newly designed special deburring tool, the burrs and flanging generated by the oil channel / internal cross hole can be completely removed under the cutting of carbide cutting edges. At the same time, it is easy to install and use, and there is no need to design production line tooling and fixtures, etc., which simplifies the production line layout. The designed tool edge is simple and efficient, without a complex edge distribution, which greatly saves the cost of tool manufacturing. While having a long service life, it can efficiently and thoroughly remove burrs and flanging, improve the cleanliness FTQ of the oil channel / internal cross hole of the part, and the cycle time is not large, which is particularly suitable for mass production requirements. At the same time, the tool optimized by this solution has made adjustments to the direction of the internal coolant outlet, which can completely remove the burrs and flanging and flush the removed burrs to the hole position, making it easy to clean with a cleaning machine.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A deburring tool for engine cross oil passages, characterized in that: It includes a blade body and a blade head, the blade head is connected to one end of the blade body, the blade head is provided with two oppositely arranged cutting blades, a cutting groove is provided between the cutting blades, at least one flushing hole is provided in the cutting groove, and an internal cooling hole is provided inside the blade body, and the internal cooling hole is connected to the flushing hole.

2. The engine cross oil channel deburring tool according to claim 1, characterized in that: The coolant of the flushing hole is sprayed toward the hole wall and the cutting edge of the cutting blade.

3. The engine cross oil channel deburring tool according to claim 1, characterized in that: A chip removal groove is provided along the surface of the cutter body, and the chip removal groove is communicated with the cutting groove.

4. The engine cross oil channel deburring tool according to claim 1, characterized in that: The included angle between the flushing hole and the inner cooling hole is 45°.

5. The engine cross oil channel deburring tool according to claim 1, characterized in that: The included angle between the flushing hole and the inner cooling hole is 60°.

6. The engine cross oil channel deburring tool according to claim 1, characterized in that: The diameter of the inner cooling hole is less than or equal to 0.2 mm.

7. The engine cross oil channel deburring tool according to claim 1, characterized in that: The single-side tool clearance between the cutting edge and the hole wall is less than or equal to 0.05 mm.

8. The engine cross oil channel deburring tool according to claim 1, characterized in that: The cutter head and the cutter body are connected by welding.

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