Efficient drilling guide sleeve for oil hole of automobile crankshaft

Abstract

The utility model discloses a kind of high-efficiency drilling guide bushings of automobile crankshaft oil hole, it is related to the technical field of drilling guide bushings, including guide bushing body, the shaft center of guide bushing body is equipped with the guide hole of through two ends, cooling system, chip removal system and anti-adhesion structure are equipped on guide bushing body.The utility model in, the 0.01-0.015mm optimization cooperation gap of guide hole and drill bit, both guarantee the guiding precision, and reasonable space is reserved for chip discharge, cooperate the directional injection design of oblique cooling channel, solve the problem that cutting fluid transportation is limited, difficult to cover cutting edge, effectively reduce drill bit high temperature wear and breakage risk;The synergistic effect of helical chip flute and negative pressure chip removal interface can quickly discharge chip even in the scene of oblique oil hole countergravity chip removal, avoid processing interruption, reduce chip adhesion in combination with anti-adhesion coating, further improve the stability of chip removal, guarantee production continuity.

Description

Technical Field

[0001] This utility model relates to the field of drilling guide sleeve technology, and in particular to a high-efficiency drilling guide sleeve for automobile crankshaft oil holes. Background Technology

[0002] As a core transmission component of the engine, the machining accuracy of the radial and axial oil holes in the automotive crankshaft directly affects the engine's lubrication effect and service life. However, the crankshaft's multi-bend eccentric structure, high-strength materials, and deep-hole machining scenarios easily lead to problems such as drilling deviation, out-of-tolerance dimensions, and high tool wear in traditional drilling. The high-efficiency drilling guide sleeve for automotive crankshaft oil holes, as a key auxiliary tooling, achieves real-time drill bit guidance and positioning through the high-precision inner hole of its wear-resistant alloy body. Combined with cooling and lubrication channels, it simultaneously cools the tool and removes chips. This not only limits the radial oscillation of the drill bit to ensure the coaxiality, perpendicularity, and diameter tolerance of the oil holes meet standards, but also increases feed rate, reduces scrap rate and tool wear. It is suitable for the batch production needs of multiple crankshaft models and effectively solves the pain points of "low precision, poor efficiency, and high cost" in oil hole machining under complex working conditions. It is an important tooling component for ensuring engine assembly accuracy and stable operation. However, in existing technologies, the deep hole structure and oblique layout of the oil holes in automotive crankshafts restrict the delivery path of cutting fluid and cause the chip removal direction to be opposite to the force of gravity. Furthermore, the existing cooling channel design of the guide sleeve lacks specificity, and the unreasonable layout makes it difficult for the cutting fluid to accurately reach the core cutting area and fully cover the cutting edge of the drill bit. At the same time, the fit clearance between the guide sleeve and the drill bit is not optimized enough. Either the clearance is too large, causing the cutting fluid to leak out too quickly, or the clearance is too small, resulting in a narrow space for chip removal. In addition, the chips generated by drilling high-strength materials of crankshafts tend to stick together and accumulate, further blocking the chip removal channel. This ultimately creates a vicious cycle of insufficient cooling and obstructed chip removal. This predicament directly leads to accelerated wear and even breakage of the drill bit due to high temperature. The inner wall of the oil hole is easily scratched by the blocked chips, resulting in a decrease in machining accuracy and surface quality. Moreover, the machining interruptions caused by poor chip removal require frequent shutdowns for cleaning, which not only disrupts production continuity and reduces machining efficiency, but also increases the overall machining cost due to the increased scrap rate. Utility Model Content

[0003] The purpose of this utility model is to solve the problems existing in the prior art and to propose a high-efficiency drilling guide sleeve for automobile crankshaft oil holes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: It includes a guide sleeve body, the guide sleeve body having a guide hole extending through both ends at its axial center. The guide sleeve body is provided with a cooling system, a chip removal system, and an anti-adhesion structure. The cooling system includes multiple oblique cooling channels distributed circumferentially along the guide sleeve body. One end of each oblique cooling channel penetrates the outer peripheral wall of the guide sleeve body to form a coolant inlet, and the other end penetrates the front end face of the guide sleeve body to form a front outlet. The front outlet faces the axial direction of the guide hole. The chip removal system includes a spiral chip removal groove formed on the inner wall of the guide hole and a negative pressure chip removal interface connected to the outer peripheral wall of the guide sleeve body. The spiral chip removal groove extends axially along the guide hole, and the negative pressure chip removal interface communicates with the spiral chip removal groove. The anti-adhesion structure is an anti-adhesion coating sprayed on the inner wall of the guide hole and the surface of the spiral chip removal groove. The front end of the guide sleeve body is provided with a positioning reference surface. The fit clearance between the diameter of the guide hole and the outer diameter of the drill bit is 0.01-0.015mm.

[0005] Preferably, the angle between the inclined cooling channel and the axis of the guide hole is 30°-60°, and the front end outlets of the plurality of inclined cooling channels are evenly distributed along the circumference of the guide hole.

[0006] Preferably, the spiral chip removal groove is distributed circumferentially along the inner wall of the guide hole, the pitch of the spiral chip removal groove is 0.8-1.2 times the length of the guide sleeve body, and the groove depth is 0.5-1.5mm.

[0007] Preferably, the guide sleeve body adopts a modular design, including a base and a replaceable guide liner. The guide hole, spiral chip removal groove and anti-adhesion coating are all provided on the guide liner, and the base and the guide liner are fixed by interference fit.

[0008] Preferably, the flatness of the positioning reference surface is ≤0.005mm.

[0009] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, the optimized fit clearance of 0.01-0.015mm between the guide hole and the drill bit ensures both guiding accuracy and provides reasonable space for chip removal. Combined with the directional spray design of the inclined cooling channel, it solves the problems of limited cutting fluid delivery and difficulty in covering the cutting edge, effectively reducing the risk of high-temperature wear and breakage of the drill bit. The synergistic effect of the spiral chip removal groove and the negative pressure chip removal interface can quickly remove chips even in the anti-gravity chip removal scenario of the inclined oil hole, avoiding processing interruption. Combined with the anti-adhesion coating to reduce chip adhesion, it further improves chip removal stability and ensures production continuity. The positioning reference surface ensures that the guide hole and the oil hole axis are coaxial. With the coordinated work of various systems, it significantly improves the machining accuracy and surface quality of the oil hole and reduces the scrap rate. The overall structure effectively improves machining efficiency, reduces tool wear and overall machining costs through the integrated design of cooling, chip removal and anti-adhesion, and is suitable for the high-efficiency drilling needs of deep holes and inclined oil holes in automotive crankshafts.

[0010] 2. In this utility model, the positioning datum surface with a flatness of ≤0.005mm at the front end of the guide sleeve body effectively ensures the coaxiality of the guide hole and the oil hole axis, laying the foundation for machining accuracy; the 30°-60° angled design of the inclined cooling channel and the circumferentially uniform distribution of the front outlet achieve precise full-circumference coverage of the cutting fluid on the drill bit cutting edge, solving the problem of insufficient cooling and reducing the risk of high-temperature wear and breakage of the drill bit; the optimized pitch and groove depth parameters of the spiral chip removal groove, combined with the negative pressure chip removal interface, greatly improve the chip removal efficiency, even Even in gravity-fed scenarios involving inclined oil holes, clogging can be avoided, ensuring production continuity. The modular design allows for individual replacement of the guide liner, reducing operating costs. The optimized 0.01-0.015mm clearance between the guide hole and the drill bit balances guiding accuracy and chip removal space. The anti-adhesion coating further reduces chip adhesion. Combined with the synergistic effect of various structures, it significantly improves the machining accuracy and surface quality of oil holes, reduces scrap rate, increases machining efficiency, reduces tool wear and overall machining costs, and is suitable for the high-efficiency drilling requirements of crankshaft deep holes and inclined oil holes. Attached Figure Description

[0011] Figure 1 This utility model provides a first three-dimensional structural schematic diagram of a high-efficiency drilling guide sleeve for oil holes in automobile crankshafts. Figure 2 This utility model provides a second three-dimensional structural schematic diagram of a high-efficiency drilling guide sleeve for automobile crankshaft oil holes; Figure 3 This utility model provides a front view cross-sectional structural diagram of a high-efficiency drilling guide sleeve for oil holes in automobile crankshafts. Legend: 1. Guide sleeve body; 2. Guide hole; 3. Angled cooling channel; 4. Spiral chip removal groove. Detailed Implementation

[0012] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0013] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0014] Example 1: As Figure 1 - Figure 3 As shown, this utility model provides a high-efficiency drilling guide sleeve for automobile crankshaft oil holes, including a guide sleeve body 1. The guide sleeve body 1 has a guide hole 2 through both ends through its axial center. The guide sleeve body 1 is provided with a cooling system, a chip removal system and an anti-adhesion structure. The cooling system includes multiple inclined cooling channels 3 distributed circumferentially along the guide sleeve body 1. One end of the inclined cooling channel 3 penetrates the outer peripheral wall of the guide sleeve body 1 to form a coolant inlet, and the other end penetrates the front end face of the guide sleeve body 1 to form a front end outlet. The front end outlet is oriented in the axial direction of the guide hole 2. The chip removal system includes a spiral chip removal groove 4 opened in the inner wall of the guide hole 2 and a negative pressure chip removal interface provided on the outer peripheral wall of the guide sleeve body 1. The spiral chip removal groove 4 is arranged axially along the guide hole 2, and the negative pressure chip removal interface is connected to the spiral chip removal groove 4. The anti-adhesion structure is an anti-adhesion coating sprayed on the inner wall of the guide hole 2 and the surface of the spiral chip removal groove 4. The front end of the guide sleeve body 1 is provided with a positioning reference surface. The fit clearance between the diameter of the guide hole 2 and the outer diameter of the drill bit is 0.01-0.015mm.

[0015] The specific settings and functions of this embodiment are described in detail below: Before machining, precise positioning is achieved through the positioning reference surface 7 at the front end of the guide sleeve body 1, ensuring that the guide hole 2 is coaxial with the axis of the oil hole to be machined, and that the guide hole 2 and the outer diameter of the drill bit maintain an optimized fit clearance of 0.01-0.015mm, taking into account both guiding accuracy and chip removal space; During drilling, the cutting fluid enters through the coolant inlet of the inclined cooling channel 3, and is precisely sprayed to the cutting core area through its front end outlet facing the axis of the guide hole 2, fully covering the cutting edge of the drill bit to achieve efficient cooling. At the same time, the chips generated by drilling enter the spiral chip removal groove 4 on the inner wall of the guide hole 2 under the rotation of the drill bit. With the suction force generated by the negative pressure chip removal interface connected to the outer peripheral wall of the guide sleeve body 1, the chips are quickly discharged along the spiral chip removal groove 4. The anti-adhesion coating sprayed on the inner wall of the guide hole 2 and the surface of the spiral chip removal groove 4 can reduce chip adhesion and accumulation, avoid blockage of the chip removal channel, and form a synergistic working mechanism of "precise cooling - efficient chip removal - anti-adhesion assistance", breaking the vicious cycle of the prior art.

[0016] The optimized 0.01-0.015mm clearance between the guide hole 2 and the drill bit ensures guiding accuracy while providing reasonable space for chip removal. Combined with the directional spray design of the inclined cooling channel 3, it solves the problem of limited cutting fluid delivery and difficulty in covering the cutting edge, effectively reducing the risk of high-temperature wear and breakage of the drill bit. The synergistic effect of the spiral chip removal groove 4 and the negative pressure chip removal interface enables rapid chip removal even in the anti-gravity chip removal scenario of the inclined oil hole, avoiding processing interruption. Combined with the anti-adhesion coating to reduce chip adhesion, it further improves chip removal stability and ensures production continuity. The positioning reference surface ensures that the guide hole 2 and the oil hole axis are coaxial. With the coordinated work of various systems, it significantly improves the machining accuracy and surface quality of the oil hole and reduces the scrap rate. The overall structure, through the integrated design of cooling, chip removal, and anti-adhesion, effectively improves machining efficiency, reduces tool wear and overall machining costs, and is suitable for the high-efficiency drilling requirements of deep holes and inclined oil holes in automotive crankshafts.

[0017] Example 2: Figure 1 - Figure 3 As shown, the angle between the inclined cooling channel 3 and the axis of the guide hole 2 is 30°-60°. The front outlets of multiple inclined cooling channels 3 are evenly distributed along the circumference of the guide hole 2. The spiral chip removal groove 4 is distributed along the inner wall of the guide hole 2. The pitch of the spiral chip removal groove 4 is 0.8-1.2 times the length of the guide sleeve body 1, and the groove depth is 0.5-1.5mm. The guide sleeve body 1 adopts a modular design, including a base and a replaceable guide liner. The guide hole 2, spiral chip removal groove 4 and anti-adhesion coating are all set on the guide liner. The base and the guide liner are fixed by interference fit. The flatness of the positioning reference surface is ≤0.005mm.

[0018] The specific settings and functions of this embodiment are described below: Before machining, precise positioning is achieved through the positioning reference surface 7 with a flatness of ≤0.005mm at the front end of the guide sleeve body 1, ensuring that the guide hole 2 is coaxial with the axis of the oil hole to be machined, and that the guide hole 2 maintains an optimized fit clearance of 0.01-0.015mm with the outer diameter of the drill bit; the guide sleeve body 1 adopts a modular design with an interference fit between the base and a replaceable guide liner. The guide hole 2, the spiral chip removal groove 4, and the anti-adhesion coating are all integrated into the guide liner, facilitating later maintenance and replacement; during drilling, the cutting fluid enters through the coolant inlet of the inclined cooling channel 3. Since the inclined cooling channel 3 forms an angle of 30°-60° with the axis of the guide hole 2, and Multiple front-end outlets are evenly distributed around the circumference of the guide hole 2, allowing the cutting fluid to precisely cover the drill bit's cutting edge for efficient cooling. Simultaneously, the chips generated during drilling enter the spiral chip removal grooves 4 distributed around the circumference of the inner wall of the guide hole 2 under the rotation of the drill bit. The pitch of these spiral chip removal grooves 4 is 0.8-1.2 times the length of the guide sleeve body 1, and the groove depth is 0.5-1.5 mm. Combined with the suction force generated by the negative pressure chip removal interface connected to the outer circumference of the guide sleeve body 1, the chips are quickly discharged along the spiral chip removal grooves 4. The anti-adhesion coating reduces the adhesion and accumulation of chips on the inner wall of the guide hole 2 and the surface of the spiral chip removal grooves 4, forming a synergistic working mechanism of "precise positioning - directional cooling - efficient chip removal - anti-adhesion assistance".

[0019] The positioning datum surface with a flatness of ≤0.005mm at the front end of the guide sleeve body 1 effectively ensures the coaxiality of the guide hole 2 and the oil hole axis, laying the foundation for machining accuracy. The 30°-60° included angle design of the inclined cooling channel 3 and the uniform circumferential distribution of the front outlet achieve precise full-circumference coverage of the cutting fluid on the drill bit cutting edge, solving the problem of insufficient cooling and reducing the risk of high-temperature wear and breakage of the drill bit. The optimized pitch and groove depth parameters of the spiral chip removal groove 4, combined with the negative pressure chip removal interface, greatly improve the chip removal efficiency, even in inclined oil... Even under gravity-induced hole conditions, clogging can be avoided, ensuring production continuity. The modular design allows for individual replacement of the guide liner, reducing operating costs. Furthermore, the optimized 0.01-0.015mm clearance between the guide hole 2 and the drill bit balances guiding accuracy and chip removal space. The anti-adhesion coating further reduces chip adhesion. Combined with the synergistic effect of various structures, it significantly improves the machining accuracy and surface quality of oil holes, reduces scrap rate, increases machining efficiency, reduces tool wear and overall machining costs, and is suitable for the high-efficiency drilling needs of crankshaft deep holes and inclined oil holes.

[0020] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A high-efficiency drilling guide sleeve for oil holes in automotive crankshafts, characterized in that: The system includes a guide sleeve body (1), with a guide hole (2) through both ends on the axis of the guide sleeve body (1). The guide sleeve body (1) is provided with a cooling system, a chip removal system and an anti-adhesion structure. The cooling system includes multiple inclined cooling channels (3) distributed circumferentially along the guide sleeve body (1). One end of the inclined cooling channel (3) penetrates the outer peripheral wall of the guide sleeve body (1) to form a coolant inlet, and the other end penetrates the front end face of the guide sleeve body (1) to form a front end outlet. The front end outlet is oriented in the axial direction of the guide hole (2). The chip removal system includes a spiral chip removal groove (4) opened on the inner wall of the guide hole (2) and a negative pressure chip removal interface connected to the outer peripheral wall of the guide sleeve body (1). The spiral chip removal groove (4) is axially continuous along the guide hole (2), and the negative pressure chip removal interface is connected to the spiral chip removal groove (4). The anti-adhesion structure is an anti-adhesion coating sprayed on the inner wall of the guide hole (2) and the surface of the spiral chip removal groove (4). The front end of the guide sleeve body (1) is provided with a positioning reference surface. The fit clearance between the diameter of the guide hole (2) and the outer diameter of the drill bit is 0.01-0.015mm.

2. The high-efficiency drilling guide sleeve for automobile crankshaft oil holes according to claim 1, characterized in that, The angle between the inclined cooling channel (3) and the axis of the guide hole (2) is 30°-60°, and the front end outlets of the multiple inclined cooling channels (3) are evenly distributed along the circumference of the guide hole (2).

3. The high-efficiency drilling guide sleeve for automobile crankshaft oil holes according to claim 1, characterized in that, The spiral chip removal groove (4) is distributed circumferentially along the inner wall of the guide hole (2). The pitch of the spiral chip removal groove (4) is 0.8-1.2 times the length of the guide sleeve body (1), and the groove depth is 0.5-1.5mm.

4. The high-efficiency drilling guide sleeve for automobile crankshaft oil holes according to claim 1, characterized in that, The guide sleeve body (1) adopts a modular design, including a base and a replaceable guide liner. The guide hole (2), spiral chip removal groove (4) and anti-adhesion coating are all set on the guide liner. The base and the guide liner are fixed by interference fit.

5. The high-efficiency drilling guide sleeve for automobile crankshaft oil holes according to claim 1, characterized in that, The flatness of the positioning reference surface is ≤0.005mm.

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