Composite coating inner-cooling drill with wear resistance and heat dissipation integrated design

Abstract

The utility model belongs to the technical field of machining tools, particularly relates to a wear-resistant and heat-dissipation integrated composite coating inner-cooling drill, and aims to solve the problems that a drill body of an existing device rotates at a high speed to cut into a workpiece, the temperature of a contact area is sharply increased due to strong friction between a drill tip and the surface of the workpiece, and the drill tip is thermally deformed due to overhigh temperature; in order to solve the problems that in the prior art, drilling precision is affected, and tool abrasion is accelerated, the following scheme is provided: the wear-resistant and heat-dissipation integrated composite coating inner-cooling drill comprises a drill handle, a drill body and a guide part; the drill bit has the advantages that the spiral chip grooves form a concave-convex structure on the conical surface of the guide portion, actual contact area of the drill bit and a workpiece is greatly reduced, friction force and heat generated by friction are reduced, temperature of the drill bit can be reduced, thermal deformation is reduced, service life of the drill bit is prolonged, dimensional deviation of the workpiece caused by thermal expansion can be reduced, and service life of the drill bit is prolonged. And therefore, the machining precision of the workpiece is further improved, and the high-quality machining effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an inner cooling drill, in particular to a composite coating inner cooling drill of wear -resisting and heat dissipation integrated design belongs to mechanical processing tool technical field. BACKGROUND

[0002] Hole process is one of effective methods of hole forming, and it accounts for a large proportion in mechanical processing, since the drill bit does not have chip breaking structure, when processing parts, especially when drilling soft material, the chip is long, the drill bit is easy to entangle chip and scratch hole wall or even break the drill bit, and the deep hole drilling is particularly obvious, and the chip is often not discharged in time, causing the phenomenon of hole bottom extrusion chip;

[0003] In the prior art, such as the inner cooling drill disclosed in the announcement No. CN112222486A, the problem of hole bottom extrusion chip and poor chip removal is solved, the risk of hole bottom extrusion chip being difficult to remove and not being removed completely is reduced, and the effect of improving the quality of parts is improved, but the prior art has the following disadvantages: in the processing process, the drill body is rotated at high speed and cut into the workpiece, bears huge cutting force and friction force, with the continuous cutting, the drill tip and the workpiece surface are rubbed at high speed, the temperature of the contact area is sharply increased, the high temperature not only causes thermal deformation of the drill tip, changes the geometric shape of the drill tip, seriously affects the precision and quality of drilling, but also significantly accelerates the wear of the tool, greatly shortens the service life of the tool, and further increases the tool replacement cost and reduces the processing efficiency. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the problem that the drill body of the above-mentioned device is rotated at high speed and cut into the workpiece, the drill tip and the workpiece surface are rubbed at high speed, the temperature of the contact area is sharply increased, the high temperature not only causes thermal deformation of the drill tip, affects the precision of drilling, but also accelerates the wear of the tool, shortens the service life of the tool, and provides a composite coating inner cooling drill of wear -resisting and heat dissipation integrated design.

[0005] The utility model realizes the above-mentioned purpose through the following technical scheme: a composite coating inner cooling drill of wear -resisting and heat dissipation integrated design, including drill handle, drill body and guide part,

[0006] The drill handle is fixedly connected with the drill body, the guide part is fixed to the front end of the drill body, the end of the guide part is in conical structure, the conical surface of the guide part is provided with spiral chip removal groove, the spiral chip removal groove is uniformly distributed along the circumferential direction of the guide part, and the transition fillet is arranged between the outer surface of the guide part and the cutting edge of the drill body.

[0007] As a further scheme of the utility model: the surface of the drill body and the guide part is coated with a composite coating, the composite coating is composed of a wear -resistant coating in the inner layer and a heat dissipation coating in the outer layer.

[0008] As a further scheme of the utility model: the inside of the drill body is equipped with an internal cooling channel, the internal cooling channel extends from one end of the drill shank to the guide part, and the cross section of the internal cooling channel is circular.

[0009] As a further scheme of the utility model: the surfaces of the drill body and the guide part are provided with spray holes, the spray holes are distributed in an inclined manner, and the spray direction is towards the cutting area.

[0010] As a further scheme of the utility model: the surface of the drill shank is provided with a clamping part matched with the clamping head of the machine tool.

[0011] As a further scheme of the utility model: the adjacent cutting edges on the surface of the drill body naturally form chip removal grooves, the chip removal grooves are in a spiral structure, and the spiral chip removal groove is connected with the chip removal groove.

[0012] The utility model has the advantages of:

[0013] The utility model discloses a drill shank, a drill body, a chip removal groove, a guide part, a spray hole and a spiral chip removal groove are matched and used, the existence of the spiral chip removal groove forms a concave-convex structure on the conical surface of the guide part, compared with a smooth surface, the actual contact area of the drill bit and the workpiece is greatly reduced, in the drilling process, the reduction of the contact area means the reduction of friction, and then the heat generated due to friction is reduced, which not only helps to reduce the temperature of the drill bit and reduce thermal deformation, but also prolongs the service life of the drill bit, in addition, the lower temperature is also favorable to improving the machining precision of the workpiece and reducing the size deviation caused by thermal expansion.

[0014] The inclined spray holes provided on the surfaces of the drill body and the guide part utilize the spray pressure of the cooling liquid to quickly flush the chips from the cutting area, assist the chips to smoothly pass through the chip removal groove and be discharged, and guarantee smooth chip removal. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole structure schematic view of the utility model;

[0016] Figure 2 It is the structure schematic view of the spray hole, the chip removal groove and the guide part in the utility model;

[0017] Figure 3 It is the structure schematic view of the utility model Figure 1 in the half section;

[0018] Figure 4 It is the bottom schematic view in the utility model Figure 1 ;

[0019] In the drawing: 1, drill shank; 2, clamping part; 3, drill body; 4, chip removal groove; 5, guide part; 6, internal cooling channel; 7, spray hole; 8, spiral chip removal groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0021] like Figures 1 to 4 As shown, a composite-coated internal cooling drill with integrated wear resistance and heat dissipation design includes a drill shank 1, a drill body 3, and a guide part 5.

[0022] The drill shank 1 is fixedly connected to the drill body 3. The guide part 5 is fixed to the front end of the drill body 3. The end of the guide part 5 has a conical structure, and the conical surface of the guide part 5 is provided with a spiral chip removal groove 8. The spiral chip removal groove 8 is evenly distributed along the circumference of the guide part 5. A transition fillet is provided between the outer surface of the guide part 5 and the cutting edge of the drill body 3.

[0023] The tapered surface at the end of the guide section 5 is designed with a spiral chip removal groove 8, which is evenly distributed along the circumference. During drilling, the chips, guided by the spiral chip removal groove 8, generate centrifugal force as the internal cooling drill rotates. At the same time, the spiral structure provides an upward pushing force, enabling the chips to be quickly discharged from the drill hole. Compared with traditional chip removal methods, this design greatly reduces the risk of chip clogging, ensures the continuity of the drilling process, and improves processing efficiency. The tapered structure at the end of the guide section 5 can quickly find the correct position at the beginning of drilling, guiding the internal cooling drill to smoothly cut into the workpiece, reducing initial shaking during drilling, improving the accuracy of the drilling position, and ensuring machining precision. The transition fillet between the outer surface of the guide section 5 and the cutting edge of the drill body 3 effectively alleviates the stress concentration phenomenon caused by structural abrupt changes. During the cutting process, the cutting force can be distributed more evenly, reducing the risk of local damage to the drill bit, improving the overall strength and stability of the drill bit, and extending the service life of the drill bit. At the same time, the presence of the spiral chip removal groove 8 forms a concave-convex structure on the conical surface of the guide part 5, which greatly reduces the actual contact area between the drill bit and the workpiece compared to a smooth surface. During the drilling process, the reduction in contact area means a reduction in friction, which in turn reduces the heat generated by friction. This not only helps to lower the temperature of the drill bit and reduce thermal deformation, but also extends the service life of the drill bit. In addition, the lower temperature is also conducive to improving the machining accuracy of the workpiece and reducing dimensional deviations caused by thermal expansion.

[0024] Furthermore, the surfaces of the drill body 3 and the guide section 5 are coated with a composite coating, which consists of an inner wear-resistant coating and an outer heat-dissipating coating.

[0025] The wear-resistant coating serves as an inner layer and directly contacts the workpiece and the chips in the cutting process, has high hardness and good wear resistance, can effectively resist the wear of the drill bit by the workpiece material, reduces the scratches, wear and peeling phenomena on the surface of the drill bit, thereby prolonging the service life of the drill bit. The heat dissipation coating serves as an outer layer and can quickly dissipate the heat generated in the cutting process. The heat dissipation coating has good thermal conductivity and can quickly transfer the heat on the surface of the drill bit to the surrounding environment, thereby reducing the temperature of the drill bit. Meanwhile, the heat dissipation coating can also prevent the heat from being transferred to the inside of the drill bit to some extent, thereby reducing the thermal deformation.

[0026] Further, the drill body 3 is internally provided with an internal cooling channel 6 extending from one end of the drill shank 1 to the guide portion 5. The internal cooling channel 6 has a circular cross section.

[0027] The internal cooling channel 6 can make the cooling liquid directly reach the cutting area. Compared with the external cooling method, the internal cooling channel 6 can more effectively take away the heat generated in the cutting process, reduce the temperature of the drill bit and the workpiece, reduce the thermal deformation, and improve the machining precision. Embodiment Two

[0028] Improvements are made on the basis of the embodiment one.

[0029] Further, the surfaces of the drill body 3 and the guide portion 5 are provided with spray holes 7. The spray holes 7 are obliquely distributed and the spray direction is towards the cutting area.

[0030] The spray holes 7 can make the cooling liquid more accurately sprayed towards the cutting area, directly cool the drill cutting edge and the contact part of the workpiece. Compared with the single cooling channel, the spray holes 7 can more comprehensively cover the high-temperature area, effectively reduce the cutting temperature, reduce the thermal wear of the cutting tool, improve the service life of the cutting tool and the machining precision. The obliquely distributed spray holes 7 can use the spray pressure of the cooling liquid to quickly flush the chips from the cutting area, help the chips smoothly pass through the chip removal groove 4 and be discharged outside, especially for some chips with large viscosity or irregular shape. The flushing effect of the spray holes 7 can effectively prevent the chips from being blocked, ensure the continuity of the drilling process, and improve the machining efficiency.

[0031] Further, the surface of the drill shank 1 is provided with a clamping portion 2 matched with the clamping head of the machine tool.

[0032] The matched clamping portion 2 can accurately match the clamping head of the machine tool, thereby ensuring the position accuracy of the drill bit in the machine tool.

[0033] Further, the adjacent cutting edges on the surface of the drill body 3 naturally form a chip removal groove 4. The chip removal groove 4 has a spiral structure. A spiral chip removal groove 8 is connected with the chip removal groove 4.

[0034] The continuous structure enables the chips to be discharged along the continuous channel, from the cutting area to the spiral chip groove 8 through the chip groove 4, and finally out of the hole. This smooth chip removal path avoids the blockage and accumulation of chips inside the drill, ensuring the efficiency of chip removal, especially suitable for deep hole machining and other occasions with high chip removal requirements. The continuous chip groove 4 is beneficial to the circulation of the cooling liquid, which can enter the chip groove 4 through the spiral chip groove 8 and then reach the cutting area. This can more fully play the cooling and lubricating effect of the cooling liquid, reduce the cutting temperature, reduce the friction between the tool and the workpiece, and improve the service life of the drill and the quality of the machined surface.

[0035] Working principle: In use, the tapered surface of the guide part 5 is provided with spiral chip grooves 8, which are evenly distributed along the circumferential direction of the guide part 5. During drilling, the chips can be smoothly discharged along the spiral chip grooves 8. At the same time, the adjacent cutting edges on the surface of the drill body 3 naturally form chip grooves 4. The chip grooves 4 are in a spiral structure, and the spiral chip grooves 8 are in communication with the chip grooves 4. This design enables the chips to continuously transition from the spiral chip grooves 8 of the guide part 5 to the chip grooves 4 of the drill body 3, and finally smoothly discharge the drilling. This effectively avoids the influence of chip accumulation on drilling quality and efficiency. In addition, a transition fillet is provided between the outer surface of the guide part 5 and the cutting edge of the drill body 3. This design helps to reduce stress concentration and improve the overall strength and durability of the internal cooling drill.

[0036] The drill body 3 and the guide part 5 are coated with a composite coating, which is composed of an inner wear-resistant coating and an outer heat-dissipating coating. The inner wear-resistant coating can be a titanium carbide coating, which has high hardness and good wear resistance, effectively resisting wear during cutting and prolonging the service life of the internal cooling drill. The outer heat-dissipating coating is an aluminum titanium nitride coating, which has good thermal conductivity and oxidation resistance, allowing heat generated during cutting to be quickly dissipated, reducing the surface temperature of the internal cooling drill and reducing tool deformation and wear caused by overheating.

[0037] The drill body 3 is provided with an internal cooling channel 6, which extends from one end of the drill shank 1 to the guide part 5. The cross-section of the internal cooling channel 6 is circular, which enables the cooling liquid to flow smoothly in the internal cooling channel 6. The surfaces of the drill body 3 and the guide part 5 are provided with injection holes 7, which are inclined and directed towards the cutting area. During drilling, the cooling liquid is delivered to the injection holes 7 through the internal cooling channel 6, and then injected at an inclined angle to the cutting area, which can more accurately and efficiently cool the cutting area, remove a large amount of cutting heat, further reduce the temperature of the internal cooling drill and the workpiece, and improve the machining quality and efficiency.

[0038] The surface of the drill handle 1 is provided with a clamping part 2 matched with the clamping head of the machine tool, through which the inner cooling drill can be stably installed on the machine tool, the design of the clamping part 2 ensures the reliable connection between the inner cooling drill and the machine tool, can accurately transmit torque and cutting force, and ensures the smooth progress of the drilling operation.

[0039] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0040] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A composite-coated internal cooling drill with integrated wear resistance and heat dissipation design, characterized in that: It includes a drill shank (1), a drill body (3), and a guide section (5); The drill shank (1) is fixedly connected to the drill body (3), the guide part (5) is fixed to the front end of the drill body (3), the end of the guide part (5) is tapered, and the tapered surface of the guide part (5) is provided with a spiral chip removal groove (8). The spiral chip removal groove (8) is evenly distributed along the circumferential direction of the guide part (5), and a transition fillet is provided between the outer surface of the guide part (5) and the cutting edge of the drill body (3).

2. The composite coating internal cooling drill with integrated wear resistance and heat dissipation design according to claim 1, characterized in that: The drill body (3) and guide section (5) are coated with a composite coating, which consists of an inner wear-resistant coating and an outer heat-dissipating coating.

3. The composite coating internal cooling drill with integrated wear resistance and heat dissipation design according to claim 1, characterized in that: The drill body (3) is provided with an internal cooling channel (6), which extends from one end of the drill shank (1) to the guide part (5), and the cross-section of the internal cooling channel (6) is circular.

4. The composite coating internal cooling drill with integrated wear resistance and heat dissipation design according to claim 1, characterized in that: Both the drill body (3) and the guide part (5) are provided with injection holes (7), which are distributed in an inclined manner and the injection direction is towards the cutting area.

5. The composite coating internal cooling drill with integrated wear resistance and heat dissipation design according to claim 1, characterized in that: The surface of the drill shank (1) is provided with a clamping part (2) that is adapted to the machine tool chuck.

6. The composite coating internal cooling drill bit with integrated wear resistance and heat dissipation design according to claim 1, characterized in that: Chip removal grooves (4) are naturally formed between adjacent cutting edges on the surface of the drill body (3). The chip removal grooves (4) have a spiral structure, and the spiral chip removal grooves (8) are connected to the chip removal grooves (4).

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