A deep hole drilling device for crankshaft machining

Abstract

This invention provides a deep hole drilling device for crankshaft machining, belonging to the field of deep hole chip breaking technology. It includes a base and a sliding platform slidably mounted on the top of the base. A docking part is rotatably mounted on the inner surface of the sliding platform, and a drill head is installed at the end of the docking part. The drill head includes a drill body and a spiral chip removal groove formed on the outer arc surface of the drill body. An impact end is integrally formed at the end of the drill body. Two symmetrical cutting edges are provided at the edge of the impact end, and several asymmetrically distributed chip-breaking grooves are formed on the surface of the cutting edges. A water outlet is located inside a receiving cavity. The front end of the chip removal groove, a contact block, and a guide block form a cutting cavity with the inner wall of the drill hole, and the receiving cavity is located between the cutting cavity and the impact end. Addressing the problem of poor chip removal in traditional deep hole machining, this invention uses coolant to intermittently impact the metal chips against the chip-breaking edge and the impact block, achieving a chip-breaking effect and making it easier for the metal chips to be discharged from the hole.

Description

Technical Field

[0001] This invention relates to the field of deep hole chip breaking technology, specifically to a deep hole drilling device for crankshaft machining. Background Technology

[0002] As an important hole system and machining design and positioning reference for the engine frame and cylinder block, the crankshaft bore's machining quality directly affects the engine's assembly accuracy and overall operating performance, making it a difficult point in machining.

[0003] When machining deep holes in crankshafts, the deep holes prevent the metal chips generated inside from being quickly removed, thus affecting the drilling process.

[0004] In existing technologies, the improvement of chip removal during drilling is to set a cutting edge on the impact surface of the drill bit to cut the metal chips into finer metal chips, thereby reducing the risk of metal chips clogging inside the chip removal groove. However, in actual drilling, since the cutting edge is located at the tip of the drill bit, the metal chips need to accumulate to a certain extent at the tip of the drill bit before they can be cut. Furthermore, the cutting process compresses the metal chips, which can easily cause them to deform. The deformed metal chips are prone to entanglement in the chip removal groove, which leads to a decrease in chip removal efficiency.

[0005] In view of this, we propose a deep hole drilling device for crankshaft machining. Summary of the Invention

[0006] This invention proposes a deep hole drilling device for crankshaft machining to solve the above-mentioned problems.

[0007] The purpose of this invention is to rapidly cool the metal chips with coolant, causing a cold plastic effect that bends the metal chips and impacts them on the chip-breaking edge. This avoids compressing and deforming the metal chips while ensuring that the metal chips generated during drill bit operation are broken into fine chips that are easy to discharge from the chip removal groove, reducing the risk of blockage inside the chip removal groove and thus overcoming the problems in the background art.

[0008] Based on the above technical concept, the technical solution adopted by this invention is as follows:

[0009] A crankshaft deep hole drilling device includes a base and a sliding platform slidably disposed on the top of the base. A docking part is rotatably disposed on the inner surface of the sliding platform. A drill head is installed at the end of the docking part. The drill head includes a drill body and a spiral chip removal groove opened on the outer arc surface of the drill body. An impact end is integrally formed at the end of the drill body.

[0010] The impact end has two symmetrical cutting edges at its edge, and the surface of the cutting edges has several asymmetrically distributed chip grooves.

[0011] The drill bit body has a cooling pipe at the center of the shaft for coolant flow, and a cooling section for intermittent coolant injection is connected to the rear end of the cooling pipe. A water outlet is provided between the front end of the cooling pipe and the chip removal groove.

[0012] The chip discharge groove is provided with a contact block and a guide block inside near the impact end. A chip breaking blade is fixedly provided on the inner surface of the contact block, and an impact block is fixedly provided on the inner surface of the guide block.

[0013] The front end of the chip removal groove forms a receiving cavity with the inner wall of the borehole, the water outlet is located inside the receiving cavity, the front end of the chip removal groove, the contact block and the guide block form a cutting cavity with the inner wall of the borehole, and the receiving cavity is located between the cutting cavity and the impact end.

[0014] As a further improvement to this technical solution, the contact block is a rounded triangle, and the side of the contact block facing the impact end is a concave arc surface, with the top of the concave arc surface facing the chip-breaking edge direction.

[0015] As a further improvement to this technical solution, the impact block is disposed on the side of the guide block near the water outlet, and the impact block has an end face facing the water outlet. The end face of the impact block has several equally spaced linearly distributed circular protrusions.

[0016] As a further improvement to this technical solution, the outer surfaces of the contact block and guide block are convex arc surfaces, and the outer surfaces of the contact block and guide block have the same curvature as the outer arc surface of the drill bit body and their centers coincide.

[0017] As a further improvement to this technical solution, the outer surfaces of the contact block and guide block are provided with countersunk holes, and the chip removal groove is provided with an internal threaded hole located below the countersunk holes. The contact block and guide block are detachably connected to the drill bit body by countersunk hexagonal bolts.

[0018] As a further improvement to this technical solution, the docking part includes a clamping mouth and an annular housing rotatably connected to the clamping mouth. The annular housing is fixedly connected to the sliding platform. A toothed ring is rotatably provided inside the annular housing. The toothed ring is fixedly connected to the clamping mouth and is meshed with a gear.

[0019] As a further improvement to this technical solution, the cooling section includes a water tank fixedly connected to the sliding platform. A water inlet hopper is provided through the top of the water tank. The water tank is connected to a water pump through a pipe. A connector is connected to the water outlet of the water pump. The connector is connected to the rear end of the cooling pipe and is conical in shape.

[0020] As a further improvement to this technical solution, a docking post is fixedly provided at the rear end of the drill bit body. The docking post is installed and docked with the clamp. The outer surface of the docking post has a rectangular cross-section, and the inner wall of the clamp has a rectangular groove.

[0021] As a further improvement to this technical solution, the top of the base is provided with a limiting hole and a limiting groove in the direction of the impact end, and the limiting hole and the limiting groove are installed and connected with the crankshaft and its fixing fixture.

[0022] As a further improvement to this technical solution, the base is provided with a sliding through groove for sliding limit of the sliding platform, and the bottom of the base is provided with an electric telescopic rod for linear drive of the sliding platform.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This invention effectively solves the problem of poor chip removal in traditional deep hole drilling by using an innovative coolant impact chip breaking mechanism. Its beneficial effects are mainly reflected in:

[0025] Intermittently injected coolant is used to rapidly cool the metal chips generated during drilling, inducing the cold plastic effect of metal. After the metal chips become brittle, they are efficiently broken by the chip-breaking edge and impact block, forming short and uniform chips. This avoids the problems of metal chip deformation and entanglement caused by compression in traditional chip-breaking methods.

[0026] Meanwhile, the coolant not only facilitates the chip breaking process but also continuously flushes the chip removal groove and rapidly discharges chips out of the hole, significantly reducing the risk of clogging and improving the continuity and stability of the drilling process. Furthermore, the structural design of the receiving and cutting chambers enhances the kinetic energy and impact force of the coolant, further optimizing chip breaking and removal efficiency. The detachable connection design of the contact block and guide block reduces maintenance costs, comprehensively improving the quality and efficiency of crankshaft deep hole machining. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of this application;

[0029] Figure 2 This is a schematic diagram of the cooling section in this application;

[0030] Figure 3 This is a cross-sectional view of the drill bit in this application;

[0031] Figure 4 This is a schematic diagram of the drill bit body in this application;

[0032] Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle;

[0033] Figure 6 This is a schematic diagram of the chip removal groove in this application;

[0034] Figure 7 Figure 6 Enlarged view of the structure at point C;

[0035] Figure 8 This is a schematic diagram of the toothed ring structure in this application;

[0036] Figure 9 for Figure 8 Enlarged view of the structure at point B in the middle.

[0037] The labels in the diagram represent the following: 1. Base; 2. Sliding platform; 3. Connecting part; 31. Gear ring; 32. Gear; 4. Drill head; 41. Drill body; 410. Connecting post; 42. Chip removal groove; 43. Impact end; 431. Cutting edge; 432. Chip breaking groove; 44. Cooling pipe; 440. Water outlet; 45. Contact block; 450. Chip breaking edge; 46. Guide block; 460. Impact block; 5. Cooling part; 51. Water tank; 52. Water pump; 53. Connecting joint. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0039] Reference Figures 1 to 9 This application discloses a crankshaft deep hole drilling equipment, including a base 1 and a sliding platform 2 slidably disposed on the top of the base 1. A docking part 3 is rotatably disposed on the side surface of the sliding platform 2, and a drill head 4 is installed at the end of the docking part 3 away from the sliding platform 2.

[0040] Among them, such as Figures 1-2As shown, the docking part 3 includes a chuck for clamping and fixing the drill head 4. The chuck is an ER type chuck, which uses a double conical surface and threaded axial drive to achieve radial contraction of the chuck, thereby firmly clamping the tool (such as a drill bit or milling cutter). During drilling, the crankshaft and its fixing fixture are fixedly installed on the top of the base 1 with the surface of the crankshaft to be drilled facing the drill head 4. The sliding platform 2 slides close to the crankshaft, thereby bringing the docking part 3 and the drill head 4 close to the surface of the crankshaft to be machined, so that the drill head 4 contacts the surface of the crankshaft and performs drilling cutting. The sliding platform 2 is provided with a linear drive structure (such as an electric telescopic rod) for driving the sliding platform 2 to slide on the top of the base 1.

[0041] However, considering that the difficulty of removing metal chips gradually increases with the depth of the deep hole machining process, especially for deep holes, in order to overcome the problem of poor chip removal in deep holes;

[0042] like Figures 3-9 As shown, the drill bit 4 includes a drill bit body 41, the outer arc surface of the drill bit body 41 is provided with a spiral chip removal groove 42, and the end of the drill bit body 41 is integrally formed with an impact end 43.

[0043] During drilling, the impact end 43 first contacts the crankshaft surface to achieve the drilling effect. The metal chips generated during the drilling process enter the chip removal groove 42 and are discharged out of the hole to avoid the accumulation of metal chips inside the hole. At the same time, when the drill bit body 41 rotates at high speed, the centrifugal force throws the chips to the outside of the spiral groove of the chip removal groove 42 and discharges them outward through the helix angle of the thread of the chip removal groove 42. The higher the rotation speed, the more obvious the chip removal effect.

[0044] During drilling, continuous metal chips are discharged upwards as the chip removal groove 42 rotates. If the chips are too long and not cut, they can easily accumulate or entangle in the groove, causing blockage of the chip removal channel. Therefore:

[0045] Two symmetrical cutting edges 431 are provided at the edge of the impact end 43. Several asymmetrical chip-breaking grooves 432 are opened on the surface of the cutting edge 431. During the rotational cutting process, the cutting edge 431 generates discontinuous chip breaking points, which causes the metal chips to be forced to break during formation, forming multiple independent chips.

[0046] The drill bit body 41 has a cooling pipe 44 for coolant flow at the axial center. The cooling pipe 44 uses φ0.5mm micropores to achieve efficient cooling, which hardly affects the strength of the drill bit body 41. The rear end of the cooling pipe 44 is connected to a cooling part 5 for intermittent injection of coolant. The front end of the cooling pipe 44 is connected to the chip removal groove 42 and a water outlet 440 is provided.

[0047] The chip removal groove 42 is provided with a contact block 45 and a guide block 46 inside near the impact end 43. A chip breaking blade 450 is fixedly provided on the inner surface of the contact block 45, and an impact block 460 is fixedly provided on the inner surface of the guide block 46.

[0048] After the drill bit body 41 enters the borehole, the front end of the chip removal groove 42 forms a receiving cavity with the inner wall of the borehole, the water outlet 440 is located inside the receiving cavity, the front end of the chip removal groove 42, the contact block 45 and the guide block 46 form a cutting cavity with the inner wall of the borehole, and the receiving cavity is located between the cutting cavity and the impact end 43.

[0049] During the drilling process of the drill bit body 41, the impact end 43 contacts the metal surface of the crankshaft to form a closed surface. When the coolant is sprayed out from the water outlet 440 through the cooling pipe 44, it can only flow out of the hole along the chip removal groove 42. At this time, the intermittently sprayed coolant impacts the metal chips inside the impact chip removal groove 42 towards the chip breaking edge 450 and the impact block 460. This process may cause the metal chips to break, thus forming short fragments that are discharged outward along the chip removal groove 42 with the coolant.

[0050] Especially when metal chips become entangled and blocked at the front end of the chip removal groove 42, the blockage of the chip removal groove 42 increases the water pressure of the coolant sprayed from the water outlet 440, and the impact effect of the coolant on the entangled metal chips is more obvious. The coolant promotes the entangled metal chips to fully contact the chip breaking blade 450 and the impact block 460 to achieve the cutting effect of the metal chips, so that the coolant can smoothly carry the metal chips out of the chip removal groove 42.

[0051] Because the coolant is intermittently delivered through the cooling section 5, the coolant intermittently fills the receiving cavity and the cutting cavity, which actively cuts the long metal chips into short and uniform chip segments, ensuring their smooth discharge. Especially when machining metals with high ductility (such as aluminum, copper or low carbon steel), long chips are very easy to stick together and entangle. The cutting action directly avoids such problems, thereby maintaining the continuity and consistency of the drilling process.

[0052] Secondly, timely cutting of metal chips reduces the possibility of them remaining in the hole, avoiding secondary cutting and scratching of the machined surface by re-entered metal chips, thus ensuring the smoothness and dimensional accuracy of the crankshaft hole wall.

[0053] Furthermore, the outlet cross-sectional area of ​​the receiving cavity is larger than that of the cutting cavity. According to the continuity equation, the flow velocity will inevitably increase when the fluid enters a narrower space. Since kinetic energy is proportional to the square of the velocity, the increase in flow velocity will significantly increase the kinetic energy carried by the fluid. When the high-speed fluid impacts the object, its rate of change of momentum (i.e., impact force) will also increase. Therefore, although the reduction in cross-sectional area may reduce static pressure, the advantage of kinetic energy still makes the momentum transferred per unit time greater, and the impact effect enhanced. This allows the metal chips entering the cutting cavity to further contact the chip breaking edge 450 and the impact block 460, improving the chip breaking effect, chip removal efficiency, and the stability of the processing process.

[0054] Furthermore, the contact block 45 is a rounded triangle, and the side of the contact block 45 facing the impact end 43 is a concave arc surface. The top of the concave arc surface faces the chip-breaking blade 450. When the coolant impacts the metal chips, the concave arc surface guides the metal chips, causing the metal chips to move towards the chip-breaking blade 450 after contacting the concave arc surface of the contact block 45, further promoting the metal chips to fully contact and cut with the chip-breaking blade 450.

[0055] Furthermore, the impact block 460 is located on the side of the guide block 46 near the water outlet 440, and the impact block 460 has an end face facing the water outlet 440. The end face of the impact block 460 has several equally spaced linearly distributed circular protrusions. After the metal chips come into contact with the coolant, the temperature of the metal chips drops due to the coolant. According to the cold plasticity of metals, the higher the metal temperature, the higher the toughness, and the lower the metal temperature, the greater the brittleness. The temperature of the metal chips that have come into contact with the coolant drops, and the brittleness increases. After contacting and impacting the circular protrusions on the surface of the impact block 460, the increased brittleness of the metal chips makes them more prone to breakage after impact. Thus, the contact between the impact block 460 and the metal chips achieves the effect of chip breaking. The broken short fragments are discharged from the hole under the flushing of the coolant.

[0056] Furthermore, the outer surfaces of the contact block 45 and the guide block 46 are convex arc surfaces. The outer surfaces of the contact block 45 and the guide block 46 have the same curvature as the outer arc surface of the drill bit body 41 and their centers coincide. The outer surfaces of the contact block 45 and the guide block 46 and the drill bit body 41 can form a perfect circle shape, which can prevent the contact block 45 and the guide block 46 from obstructing the drilling process.

[0057] Furthermore, the outer surfaces of the contact block 45 and the guide block 46 are provided with countersunk holes, and the chip removal groove 42 is provided with an internal threaded hole located below the countersunk holes. The contact block 45 and the guide block 46 are detachably connected to the drill bit body 41 by countersunk hexagonal bolts. The bolt connection method allows the contact block 45 and the guide block 46 to be replaced individually when they are worn, reducing the maintenance cost of the drill bit.

[0058] Furthermore, the docking part 3 includes an annular housing that is rotatably connected to the clamping mouth. The annular housing is fixedly connected to the sliding platform 2. A toothed ring 31 is rotatably provided inside the annular housing. The toothed ring 21 is fixedly connected to the clamping mouth. The toothed ring 31 is meshed with a gear 32. An external motor achieves the rotational transmission effect of the clamping mouth through a transmission connection with the gear 32. The toothed ring 21 structure can drive the clamping mouth to rotate and make the center of the clamping mouth empty, so that the cooling part 5 can be easily docked with the rear end of the cooling pipe 44 at one end of the docking column 410.

[0059] Furthermore, the cooling unit 5 includes a water tank 51 fixedly connected to the sliding platform 2. A water inlet is provided through the top of the water tank 51. The water tank 51 is connected to a water pump 52 through a pipe. A connector 53 is connected to the outlet end of the water pump 52. The connector 53 is connected to the rear end of the cooling pipe 44. The connector 53 is conical. The water pump 52 can pressurize the coolant. By controlling the water pump 52, the coolant can be sprayed intermittently, thereby achieving the effect of periodic impact of the coolant on metal shavings. The conical connector 53 can increase the coolant water pressure, thereby improving the flushing effect.

[0060] Based on the above embodiments, the overall working principle is as follows:

[0061] The crankshaft and its fixing fixture are installed and fixed on the base 1 with the surface to be machined facing the drill head 4. Then the drill head 4 is installed on the docking part 3, and the chuck is driven to rotate by the meshing combination of the motor, gear 32 and gear ring 31, thereby making the drill head 4 rotate at high speed.

[0062] Then, the water pump 52 in the cooling section 5 is started to pressurize the coolant and inject it into the cooling pipe 44, so that the coolant is sprayed out from the water outlet 440.

[0063] After the coolant flows out smoothly, the drill head 4 is driven by the sliding platform 2 to slide close to the surface to be machined on the crankshaft and perform cutting and drilling operations.

[0064] During the drilling process, the generated metal chips are blocked by the chip-separating groove 432, thus preventing the formation of continuous sheet-like metal chips. This causes several groups of strip-shaped metal chips to enter the chip discharge groove 42. When the metal chips enter the chip discharge groove 42, they are cooled by the impact of the coolant and collide with the chip-breaking blade 450 to achieve the chip-breaking effect. After the temperature of the metal chips decreases, they are pushed by the impact of the coolant and collide with the impact block 460 to achieve the breaking effect of the metal chips.

[0065] The cut and broken chips are discharged along the chip removal groove 42 by the coolant flowing out of the cavity. The short chips reduce the risk of entanglement and blockage inside the chip removal groove 42.

[0066] The advantages of the cooling and chip breaking method used in this equipment compared to traditional chip breaking grooves are as follows:

[0067] 1. Traditional drill bits have a chip breaker groove at the impact point to break up the generated metal chips, thus cutting the continuous metal chips and making it easier for the short-stroke metal chips to be discharged from the hole. However, because the chip breaker groove is located at the tip of the traditional drill bit, it causes the metal chips to be squeezed during the cutting process, resulting in deformation of the metal chips. The deformed metal chips will accumulate at the tip of the traditional drill bit and can only slide along the chip removal groove 42 by being pushed by subsequent metal chips. Because the squeezed metal chips are more dense, the deformed metal chips are prone to clogging in the chip removal groove 42. In addition, the temperature of the squeezed and deformed metal chips is high, and their accumulation at the tip of the traditional drill bit reduces the cooling efficiency of the drill bit.

[0068] However, the cooling breakage method used in this equipment to break up metal chips allows the metal chips to move a certain distance along the chip discharge groove 42, thereby moving the metal chips away from the impact end 43. Then, under the guidance of the contact block 45, it ensures that the metal chips are in full contact with the coolant discharged from the water outlet 440, thereby cooling down the metal chips. At this time, cooling down the metal chips also has a cooling effect on the drill bit.

[0069] After the metal shavings cool down and bend, causing them to break, the broken shavings are not compressed, thus maintaining their sheet-like shape and reducing the risk of short metal shavings tangling together. At the same time, the break point is located at the water outlet 440, and the shavings are flushed by the coolant, thereby reducing the accumulation of short metal shavings inside the chip discharge groove 42 and making the inside of the hole cleaner.

[0070] 2. During high-speed drilling, traditional drill bits are prone to melting at the drill tip due to high temperature and low heat dissipation efficiency. This results in blocky metal chips adhering to the edge of the drill tip or inside the chip removal groove.

[0071] However, the low-temperature breaking method adopted by this equipment can avoid strip metal chips being in a high-temperature state. After the strip metal chips are generated during the drilling process, they are discharged outward from the hole by the chip discharge groove 42 to perform chip breaking processing. At the same time, the short metal chips are flushed into the hole by the coolant, and the cooling effect of the drill bit body 41 is achieved during the coolant flushing process.

[0072] The above methods can effectively overcome the problem of poor chip removal during deep hole machining of crankshafts, and avoid the impact of metal chips on the deep hole machining process.

[0073] Specifically, in the description of this specification, the references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to well understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A deep hole drilling equipment for crankshaft machining, comprising a base (1) and a sliding platform (2) slidingly arranged on the top of the base (1), a butt joint portion (3) is rotatably arranged on the inner surface of the sliding platform (2), a drill portion (4) is mounted on the end of the butt joint portion (3), the drill portion (4) comprises a drill body (41) and a helical chip flute (42) formed on the outer arc surface of the drill body (41), an impact end (43) is integrally formed on the end of the drill body (41), characterized in that: two symmetrical cutting edges (431) are arranged on the edge of the impact end (43), a plurality of asymmetrically distributed chip separation grooves (432) are formed on the surface of the cutting edge (431); a cooling pipe (44) for cooling liquid flow is arranged at the inner shaft center of the drill body (41), a cooling portion (5) for intermittently injecting cooling liquid is butt jointed to the rear end of the cooling pipe (44), a water outlet hole (440) is arranged in communication between the front end of the cooling pipe (44) and the chip flute (42); a contact block (45) and a guide block (46) are arranged inside the chip flute (42) close to the impact end (43), a chip breaking edge (450) is fixedly arranged on the inner surface of the contact block (45), and a striking block (460) is fixedly arranged on the inner surface of the guide block (46); the front end of the chip flute (42) and the inner wall of the drill hole form an accommodating cavity, the water outlet hole (440) is located inside the accommodating cavity, the front end of the chip flute (42), the contact block (45) and the guide block (46) and the inner wall of the drill hole form a cutting cavity, and the accommodating cavity is located between the cutting cavity and the impact end (43); the contact block (45) is a rounded triangle, and the side of the contact block (45) facing the impact end (43) is a concave arc surface, and the top end of the concave arc surface faces the direction of the chip breaking edge (450); the striking block (460) is arranged on the side of the guide block (46) close to the water outlet hole (440), and the striking block (460) is provided with an end face facing the water outlet hole (440), and the end face of the striking block (460) is provided with a plurality of equally spaced linearly distributed circular protrusions; the outer surfaces of the contact block (45) and the guide block (46) are convex arc surfaces, the outer surfaces of the contact block (45) and the guide block (46) have the same arc degree as the outer arc surface of the drill body (41) and the same center of curvature; the outer surfaces of the contact block (45) and the guide block (46) are provided with counterbores, the chip flute (42) is provided with an internal threaded hole below the counterbores, and the contact block (45) and the guide block (46) are detachably connected to the drill body (41) through the sunk internal hexagonal bolts.

2. The deep hole drilling apparatus for machining a crankshaft according to claim 1, characterized by, The butt joint portion (3) comprises a clamping mouth and a ring-shaped shell rotatably connected with the clamping mouth, the ring-shaped shell is fixedly connected with the sliding platform (2), a gear ring (31) is rotatably arranged in the ring-shaped shell, the gear ring (31) is fixedly connected with the clamping mouth, and the gear ring (31) is meshingly connected with a gear (32).

3. The deep hole drilling apparatus for machining a crankshaft according to claim 2, characterized by, The cooling portion (5) comprises a water tank (51) fixedly connected with the sliding platform (2), a water inlet chute is penetratingly arranged on the top of the water tank (51), the water tank (51) is connected with a water pump (52) through a pipeline, a butt joint (53) is connected to the water outlet end of the water pump (52), the butt joint (53) is butt jointed to the rear end of the cooling pipe (44), and the butt joint (53) is conical.

4. The deep hole drilling apparatus for machining a crankshaft according to claim 3, characterized by, The drill bit body (41) is fixed with a butt joint column (410) at the rear end, the butt joint column (410) is installed with the clamp mouth, the outer surface of the butt joint column (410) is in a rectangular cross section, and the inner wall of the clamp mouth is provided with a rectangular groove.

5. The deep hole drilling apparatus for machining a crankshaft according to claim 4, wherein The base (1) is provided with a limiting hole and a limiting groove at the top and in the direction of the impact end (43), and the limiting hole and the limiting groove are installed with the crankshaft and the fixing tool.

6. The deep hole drilling apparatus for machining a crankshaft according to claim 5, wherein The base (1) is provided with a sliding channel for limiting the sliding of the sliding platform (2), and the bottom of the base (1) is provided with an electric telescopic rod for linearly driving the sliding platform (2).

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