A PSU center tube burr-free drilling device

Abstract

This utility model discloses a burr-free drilling device for PSU center tubes, comprising a drill bit body, a deburring tool, and a fixing sleeve. The drill bit body includes a shank and a drill bit. A positioning drill is provided at the end of the drill bit. Multiple arc-shaped grooves are provided on the outer wall of the drill bit, and end-face cutting edges are provided at the connection points between the multiple arc-shaped grooves. A lateral cutting edge is also provided on the outer wall of the drill bit. A mounting groove is provided on the shank, and the deburring tool is telescopically mounted in the mounting groove. The fixing sleeve is provided on the shank for limiting and fixing the deburring tool. A dust collection mechanism corresponding to the positioning drill and the deburring tool is also provided in the drill bit body. Using the burr-free drilling device described in this utility model combines drilling and deburring operations, which not only reduces processing costs but also improves work efficiency. The processed products meet the usage requirements, thereby improving product quality. Its overall structure is simple, easy to operate, and reasonably designed, making it worthy of widespread use.

Description

Technical Field

[0001] This utility model relates to the field of PSU center tube processing technology in RO reverse osmosis membrane elements, specifically a burr-free drilling device for PSU center tubes. Background Technology

[0002] Reverse osmosis (RO) technology has been widely used in the production of drinking water for domestic use. The central tube is a crucial component of RO membrane elements. Central tubes made of PSU (polyethersulfone) offer excellent heat resistance, corrosion resistance, hydrolysis resistance, and good mechanical strength, providing significant advantages in high-salt, high-corrosion, and high-temperature concentrate treatment systems. PSU is a high-performance engineering plastic with a variety of excellent physical and chemical properties, making it widely used in various industrial and medical applications. Due to its good transparency, PSU is particularly suitable for applications requiring a transparent or semi-transparent appearance. Furthermore, its excellent processing properties allow it to be easily manufactured into various shapes and products through injection molding, extrusion, and molding processes. Therefore, the central tubes in RO membrane elements are generally injection molded from PSU.

[0003] The central tube, located at the core of the reverse osmosis membrane element, primarily functions as a collector and guide for permeate. It collects the filtered water from the wound filter layers and transports it to the membrane outlet, ensuring efficient permeate delivery. Therefore, the central tube is a key element in guaranteeing water treatment efficiency. To achieve the permeate collection function, the injection-molded central tube requires four rows of evenly distributed perforations along its circumference to be machined on its sidewalls. During the drilling process using existing drill bits, burrs frequently occur, leading to extensive rework and often resulting in missed rework, ultimately causing defective products to be discharged.

[0004] Therefore, in order to reduce processing costs, improve drilling efficiency of PSU center tubes, reduce the need for manual deburring after drilling to avoid missed repairs and prevent defective products from being shipped out, and also to improve deburring efficiency by completing drilling and deburring operations in the same process, which can not only reduce clamping time but also improve processing efficiency, it is necessary to improve the existing drill bits to provide a burr-free drilling device specifically for PSU center tubes so that the drilled PSU center tubes meet the usage requirements and improve product quality. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the problems existing in the background technology, thereby providing a burr-free drilling device with a simple structure and convenient operation. Using this burr-free drilling device, drilling and deburring operations are combined. Drilling and deburring operations can be realized through a single clamping and fixing. In the process of drilling and deburring operations, the chip removal rate can be improved, so as to reduce processing costs, improve work efficiency, and make the processed products meet the usage requirements, thereby improving product quality. Specifically, it is a burr-free drilling device for PSU center tubes.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a burr-free drilling device for PSU center tubes, comprising a drill bit body, a deburring tool, and a fixing sleeve. The drill bit body includes an integrally formed shank and a drill bit. A positioning drill is provided at the end of the drill bit away from the shank. Multiple arc-shaped grooves are provided on the outer wall of the drill bit, and an end-face cutting edge is provided at the connection between the multiple arc-shaped grooves. The end-face cutting edge is located outside the positioning drill. A lateral cutting edge is also provided on the outer wall of the drill bit between two adjacent arc-shaped grooves. The deburring tool has a positive cutting edge and a negative cutting edge. An installation groove is provided on the shank, and an elastic element is provided in the installation groove. The deburring tool is telescopically mounted in the installation groove through the elastic element. The fixing sleeve is provided on the shank for limiting and fixing the deburring tool. A dust collection mechanism corresponding to the positioning drill and the deburring tool is also provided in the drill bit body.

[0007] Furthermore, in the burr-free drilling device for PSU center tubes described in this utility model, the dust collection mechanism includes a negative pressure hole arranged along the axial direction of the drill bit body, and a first dust collection hole and a second dust collection hole communicating with the negative pressure hole. The negative pressure hole is arranged along the center of the shank and extends into the drill bit near the positioning drill. The first dust collection hole is located in an arc-shaped groove near the rear end of the positioning drill, while the second dust collection hole is located on the shank near the front end of the deburring tool.

[0008] Furthermore, in the burr-free drilling device for PSU center tubes described in this utility model, two arc-shaped grooves are provided, and the two arc-shaped grooves are spirally and symmetrically arranged on the outer wall of the drill bit; two first dust suction holes and two second dust suction holes are provided respectively, the two first dust suction holes are symmetrically arranged in the arc-shaped groove near the rear end of the positioning drill, and the two second dust suction holes are symmetrically arranged on the handle near the front end of the deburring tool.

[0009] Furthermore, in the burr-free drilling device for PSU center tubes described in this utility model, an inwardly recessed receiving cavity is provided at the end of the drill bit away from the shank. The positioning drill is located at the center of the receiving cavity, and the positioning drill and the drill bit are integrally formed. The end face cutting edge is divided into two symmetrically arranged end face cutting edges by two arc-shaped grooves. Each end face cutting edge includes a top cutting edge and a transition cutting edge. The top cutting edge and the transition cutting edge form a stepped structure. The two end face cutting edges, together with the positioning drill, form a two-flute three-point drill bit structure through the top cutting edge and the transition cutting edge.

[0010] Furthermore, in the burr-free drilling device for PSU center tubes described in this utility model, the positioning drill is configured as a conical structure, with a positioning drill tip at the front end and a cylindrical part at the rear end, and multiple uniformly arranged cutting surfaces are provided on the outer side of the positioning drill tip; a chip removal space is formed between the cutting surfaces and the receiving cavity.

[0011] Furthermore, in the burr-free drilling device for PSU center tubes described in this utility model, the elastic element in the mounting groove is a return spring, and a support post is provided on the back of the deburring tool. The return spring is sleeved in the support post, and the deburring tool is installed in the mounting groove through the support post. Under the action of the return spring, it is in an outward convex state located on the outer wall of the tool handle. Under the action of external force, the deburring tool can retract inward into the mounting groove.

[0012] Furthermore, in the burr-free drilling device for PSU center tubes described in this utility model, the deburring tool includes an integrally formed mounting part and a cutting edge part. The mounting part is configured as a strip-shaped block structure, and the support column is disposed on the back of the mounting part. The deburring tool is movably mounted in the mounting groove through the mounting part. The cutting edge part is disposed on the outer side of one end of the mounting part and is located on the outer wall of the handle in an outward convex state. An inclined cutting edge is provided at both ends of the cutting edge part, one of which is a positive cutting edge and the other is a negative cutting edge. The deburring tool performs deburring operation on the PSU center tube through the positive and negative cutting edges.

[0013] Furthermore, in the burr-free drilling device for PSU center tubes described in this utility model, a positioning groove communicating with the mounting groove is provided on the shank. The mounting part of the deburring tool is movably installed in the mounting groove through the positioning groove and abuts against and contacts the spring element provided in the mounting groove. The fixing sleeve is equipped with a fastening screw, and a threaded hole matching the fastening screw is provided in the fixing sleeve. The fastening screw is screwed into the threaded hole and abuts against and contacts the mounting part located in the positioning groove. The fixing sleeve limits and fixes the deburring tool through the fastening screw.

[0014] The burr-free drilling device for PSU center tubes described in this utility model has the following advantages compared with the prior art: A positioning drill is provided on the end face of the drill bit, while an arc-shaped groove is provided on its outer wall. An end-face cutting edge is provided at the connection of the arc-shaped groove, and a lateral cutting edge is also provided on the outer wall of the drill bit between two adjacent arc-shaped grooves. The central positioning drill accurately positions the drill bit, and the end-face cutting edges on both sides of the arc-shaped groove reduce drill chips during entry and exit from the hole. Simultaneously, a dust extraction mechanism is also provided, which uses negative pressure to remove drill chips generated during drilling. The chip removal is achieved by using a retractable deburring tool mounted on the shank. This tool has both a positive and a negative cutting edge, which allows for deburring of the outer and inner walls of the PSU center tube after drilling. During deburring, continuous negative pressure removes the debris. Finally, controlling the rotation and feed speeds during drilling and deburring, using a slow-in, slow-out method, significantly reduces burr formation and improves product quality.

[0015] Therefore, the burr-free drilling device described in this utility model combines drilling and deburring operations. Through a single clamping and fixing, drilling and deburring operations can be achieved. During the drilling and deburring operations, the chip removal rate can be improved, which not only reduces processing costs but also increases work efficiency and ensures that the processed products meet usage requirements, thereby improving product quality. Its overall structure is simple, easy to operate, and reasonably designed, making it worthy of promotion and use. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the drilling device described in this utility model; Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along the AA direction; Figure 3 This is a three-dimensional structural diagram of the drill bit body described in this utility model. Figure 1 ; Figure 4 This is a three-dimensional structural diagram of the drill bit body described in this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the structure of the drill bit body described in the utility model; Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure along the BB direction.

[0018] The figure shows: 1-tool holder, 11-mounting groove, 12-positioning groove, 2-drill bit, 21-arc groove, 22-end face cutting edge, 221-top face cutting edge, 222-transition face cutting edge, 23-side cutting edge, 24-accommodating cavity, 3-positioning drill, 31-cutting surface, 4-deburring tool, 41-mounting part, 42-blade part, 5-fixing sleeve, 51-fastening screw, 6-dust suction mechanism, 61-negative pressure hole, 62-first dust suction hole, 63-second dust suction hole. Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0020] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," and "right" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "provided with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] It should be noted that the term "comprising" or any other variation is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Example 1

[0023] like Figures 1 to 6As shown, this embodiment provides a burr-free drilling device for PSU center tubes, including a drill bit body, a deburring blade 4, and a fixing sleeve 5. The drill bit body includes an integrally formed shank 1 and a drill bit 2. A positioning drill 3 is provided at the end of the drill bit 2 away from the shank 1. Multiple arc-shaped grooves 21 are provided on the outer wall of the drill bit 2, and an end face cutting edge 22 is provided at the connection between the multiple arc-shaped grooves 21. The end face cutting edge 22 is located outside the positioning drill 3, and a lateral cutting edge 23 is also provided on the outer wall of the drill bit 2 between two adjacent arc-shaped grooves 21. The deburring blade 4 has a positive cutting edge and a negative cutting edge. An installation groove 11 is provided on the shank 1, and an elastic element is provided in the installation groove 11. The deburring blade 4 is telescopically mounted in the installation groove 11 through the elastic element. The fixing sleeve 5 is provided on the shank 1 for limiting and fixing the deburring blade 4. A dust collection mechanism 6 corresponding to the positioning drill 3 and the deburring blade 4 is also provided in the drill bit body.

[0024] The dust collection mechanism 6 includes a negative pressure hole 61 arranged along the axial direction of the drill bit body, and a first dust collection hole 62 and a second dust collection hole 63 communicating with the negative pressure hole 61. The negative pressure hole 61 is arranged along the center of the handle 1 and extends into the drill bit 2 near the side of the positioning drill 3. The first dust collection hole 62 is located in the arc-shaped groove 21 near the rear end of the positioning drill 3, and the second dust collection hole 63 is located on the handle 1 near the front end of the deburring knife 4.

[0025] Furthermore, in the burr-free drilling device for PSU center tubes provided in this embodiment, two arc-shaped grooves 21 are provided, and the two arc-shaped grooves 21 are arranged symmetrically in a spiral shape on the outer wall of the drill bit 2; two first dust suction holes 62 and two second dust suction holes 63 are provided respectively, the two first dust suction holes 62 are arranged symmetrically in the arc-shaped groove 21 near the rear end of the positioning drill 3, and the two second dust suction holes 63 are arranged symmetrically on the handle 1 near the front end of the deburring knife 4.

[0026] Furthermore, to facilitate chip removal, a burr-free drilling device for PSU center tubes provided in this embodiment is adopted. A recessed receiving cavity 24 is provided at the end of the drill bit 2 away from the shank 1. The positioning drill 3 is located at the center of the receiving cavity 24, and the positioning drill 3 and the drill bit 2 are integrally formed. The end face cutting edge 22 is divided into two symmetrically arranged end face cutting edges 22 by two arc-shaped grooves 21. Each end face cutting edge 22 includes a top cutting edge 221 and a transition cutting edge 222. The top cutting edge 221 and the transition cutting edge 222 form a stepped structure. The two end face cutting edges 22, together with the positioning drill 3, form a two-flute, three-point drill bit structure through the top cutting edge 221 and the transition cutting edge 222.

[0027] Furthermore, to facilitate positioning, a burr-free drilling device for PSU center tubes provided in this embodiment is used. The positioning drill 3 is configured as a conical structure, with a positioning drill tip at the front end and a cylindrical part at the rear end. Multiple evenly arranged cutting surfaces 31 are provided on the outer surface of the positioning drill tip. A chip removal space is formed between the cutting surfaces 31 and the receiving cavity 24. The positioning drill tip at its front end can easily contact and position itself with the PSU center tube to be processed, thus facilitating subsequent drilling operations.

[0028] Furthermore, to ensure the deburring knife 4 can extend and retract within the mounting groove 11, a burr-free drilling device for PSU center tubes provided in this embodiment is used. The elastic element within the mounting groove 11 is a return spring, and a support post is provided on the back of the deburring knife 4. The return spring is fitted into the support post, and the deburring knife 4 is mounted in the mounting groove 11 via the support post. Under the action of the return spring, it protrudes outwards from the outer wall of the handle 1. Under external force, the deburring knife 4 can retract inwards into the mounting groove 11. The specific arrangement of the return spring and the support post on the back of the deburring knife 4 is similar to the spring button in an existing telescopic umbrella. Under normal circumstances, it protrudes outwards, and under external force, it can retract inwards. This is a conventional technical solution in the prior art and therefore is not described in detail here.

[0029] Furthermore, using the burr-free drilling device for PSU center tubes provided in this embodiment, the deburring knife 4 includes an integrally formed mounting part 41 and a cutting edge part 42. The mounting part 41 is configured as a strip-shaped block structure, and the support column is disposed on the back of the mounting part 41. The deburring knife 4 is movably mounted in the mounting groove 11 through the mounting part 41. The cutting edge part 42 is disposed on the outer side of one end of the mounting part 41 and is located on the outer wall of the handle 1 in an outwardly protruding state. An inclined cutting edge is provided at both ends of the cutting edge part 42, one of which is a positive cutting edge and the other is a negative cutting edge. The deburring knife 4 performs deburring operation on the PSU center tube through the positive cutting edge and the negative cutting edge.

[0030] Meanwhile, the handle 1 is also provided with a positioning groove 12 that communicates with the mounting groove 11. The mounting part 41 of the deburring knife 4 is movably installed in the mounting groove 11 through the positioning groove 12 and abuts against the spring member provided in the mounting groove 11. The fixing sleeve 5 is provided with a fastening screw 51. The fixing sleeve 5 is provided with a threaded hole that matches the fastening screw 51. The fastening screw 51 is screwed into the threaded hole and abuts against the mounting part 41 located in the positioning groove 12. The fixing sleeve 5 uses the fastening screw 51 to limit and fix the deburring knife 4.

[0031] By setting the positioning groove 12 on the handle 1 and under the action of the fixing sleeve 5, the rotating deburring knife 4 can be restricted, avoiding the problem of flying outward during rotation, thereby improving the stability of the deburring knife 4 and reducing safety hazards. Example 2

[0032] This embodiment also provides a method for using the above-mentioned burr-free drilling device for PSU center pipes, the method comprising the following steps: S1: Place the PSU center tube to be processed in the clamping mechanism of the existing drilling machine to clamp and fix the PSU center tube to be processed; S2: After the PSU center tube to be processed is clamped and fixed, the assembled burr-free drilling device is installed on the hollow spindle of the existing drilling machine in advance, so that the spindle center hole on the hollow spindle is connected to the dust collection mechanism 6 in the burr-free drilling device. Then, the spindle center hole is connected to the external negative pressure pump through a pipe, and a drill cuttings collection bag is provided at the negative pressure pump end. S3: Start the drilling machine and use the hollow spindle to drive the burr-free drilling device to rotate. First, use the positioning drill 3 to locate the position to be drilled. Then, use the end face cutting edge 22 and the side cutting edge 23 to perform drilling operation on the PSU center tube. During the drilling process, start the negative pressure pump. Under negative pressure, use the dust suction mechanism 6 to remove the tiny drill chips generated during drilling until the drilling is completed. S4: After drilling is completed, the rotating drill bit 2 continues to move downwards. First, the positive cutting edge of the deburring cutter 4 is used to remove burrs from the outer wall of the PSU center tube hole. After the burrs on the outer wall of the PSU center tube hole are removed, the drill bit 2 continues to move downwards. Under the action of external force, the deburring cutter 4 is squeezed into the mounting groove 11 in the handle 1. Then, as the drill bit 2 continues to move downwards, the deburring cutter 4 pops outwards during the automatic reset of the elastic element. The reverse cutting edge of the deburring cutter 4 is used to remove burrs from the inner wall of the PSU center tube hole. During the deburring process, under continuous negative pressure, the dust suction mechanism 6 is used to remove the tiny drill chips generated during deburring until the deburring is completed.

[0033] In addition, to reduce burr formation and improve product quality during drilling and deburring, it is necessary to control the rotation speed and feed rate, using a slow feed and slow output method. The specific operation method is as follows: During the drilling process in step S3, the hollow spindle drives the burr-free drilling device to rotate. First, it approaches the upper surface of the PSU center tube at a speed of 10 m / min, then reduces the speed to 1 m / min. The positioning drill tip of the positioning drill 3 is aligned with the drilling position, and then the drill enters the PSU center tube at a feed rate of 0.08 mm / s. The end-face cutting edge 22 is used to drill the PSU center tube. After the end-face cutting edge 22 enters the PSU center tube, the feed rate is increased to 0.12 mm / s to accelerate production efficiency. When the end-face cutting edge 22 is 0.8–1.2 mm from the inner wall of the PSU center tube, the feed rate is reduced to 0.08 mm / s until the end-face cutting edge 22 exits the inner wall of the PSU center tube hole by 0.8–1.2 mm. During the deburring process in step S4, as the rotating drill bit 2 continues to move downwards until the cutting edge of the deburring cutter 4 contacts the outer wall of the hole in the PSU center tube, the movement is paused for 0.5 seconds. The cutting edge is used to remove burrs from the outer wall of the PSU center tube until the burrs are completely removed. Then, the drill bit 2 continues to move downwards, and the deburring cutter 4 is squeezed into the mounting groove 11 in the handle 1 under external force, ceasing the deburring operation on the PSU center tube. As the drill bit continues to move, the deburring knife 4 pops outward during the automatic reset of the elastic element. At this time, after the reverse blade in the deburring knife 4 contacts the inner wall of the hole of the PSU center tube, the movement is paused for 0.5 seconds. The reverse blade is used to remove the burrs from the inner wall of the hole of the PSU center tube until the burrs are completely removed. At the same time, during the entire deburring process, the tiny drill chips generated during deburring are removed by continuous negative pressure. Finally, the drill bit 2 is moved upward and withdrawn at a rotation speed of 0.2 mm / s, and the drilling and deburring work is completed.

[0034] The present invention describes a burr-free drilling device for PSU center tubes. The drill bit body employs a specially designed drill bit structure, with a positioning drill 3 at the top of the drill bit 2. In actual manufacturing, the cone angle of the positioning drill 3 is designed to be 60 degrees, while the cone angle of the end face cutting edge 22 is designed to be 150 degrees, thus forming a specially designed three-pointed, two-edged structure. Simultaneously, a deburring knife 4 is configured in the handle 1, with both a positive and a negative cutting edge. These edges can be used to deburr the outer and inner walls of the tube. Furthermore, a dust extraction mechanism 6 is also included, connected to an external negative pressure pump, to remove burrs generated during the drilling and deburring stages.

[0035] Burrs are caused by unstable processing at the inlet and outlet or by material plasticization, resulting in material that should have been removed but was not. To remove burrs, the burr-free drilling device provided in this invention is used. Through the positioning drill 3, the top of the drill bit 2 can be fixed to the PSU center tube to be processed, changing the drill bit 2 from a cantilever beam state to a simply supported beam state, which greatly improves its stability. Simultaneously, through a specially designed three-pointed, two-edged drill bit structure, the traditional one-piece drill tip is replaced with two protruding, sharp top edges. The sharp top edges produce cleaner cuts, reducing the likelihood of material residue causing burrs. During the drilling and deburring stages, reducing the speed at the inlet and outlet of the tube's outer and inner walls helps reduce the possibility of material being heated and plasticized. Plasticized material is less likely to be cut and form burrs. In actual manufacturing, the positive and negative cutting edges of the deburring cutter 4 can be designed with a 45-degree inclined structure. The 45-degree rotating cutting edge removes burrs generated during drilling. The deburring cutter 4 is telescopically mounted in the mounting groove 11 via an elastic element. The positive cutting edge removes burrs from the outer wall. As the drill bit 2 moves downwards, the deburring cutter 4 is pushed into the handle 1 and does not work. When the drill penetrates the central tube, the deburring cutter 4 opens outwards under the action of the elastic element, and the negative cutting edge begins to work, removing burrs from the inner wall of the hole. Stopping the feed and maintaining rotation facilitates burr removal. The continuously supplied negative pressure can remove the generated debris, similar to the suction principle of a vacuum cleaner.

[0036] Therefore, the burr-free drilling device of this invention features a positioning drill 3 on the end face of the drill bit 2, an arc-shaped groove 21 on its outer wall, an end-face cutting edge 22 at the connection of the arc-shaped groove 21, and a lateral cutting edge 23 on the outer wall of the drill bit 2 between two adjacent arc-shaped grooves 21. The positioning drill 3 accurately positions the drill bit, and the end-face cutting edges 22 on both sides of the arc-shaped groove 21 reduce drill chips during entry and exit. Simultaneously, a dust extraction mechanism 6 is provided, which uses negative pressure to remove drilling debris. Furthermore, since a retractable deburring cutter 4 is installed on the handle 1, and since the deburring cutter 4 has a positive cutting edge and a negative cutting edge, the positive cutting edge and the negative cutting edge can be used to deburr the outer wall surface and the inner wall surface of the PSU center tube after drilling. During the deburring process, the debris generated during the deburring operation can be removed by continuous negative pressure. Finally, during the drilling and deburring process, controlling the rotation speed and feed speed and adopting a slow feed and slow output method can not only greatly reduce the generation of burrs, but also improve product quality.

[0037] In summary, the burr-free drilling device described in this utility model combines drilling and deburring operations. Through a single clamping and fixing, drilling and deburring can be achieved. During both operations, the chip removal rate is improved, which not only reduces processing costs but also increases work efficiency and ensures the processed products meet usage requirements, thereby enhancing product quality. Its overall structure is simple, easy to operate, and rationally designed, making it worthy of widespread application.

[0038] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0039] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. The above description is only a preferred embodiment of this utility model and does not limit this utility model. Any minor modifications, equivalent substitutions and improvements made based on the technical solutions of this utility model should be included within the scope of protection of the technical solutions of this utility model.

Claims

1. A burr-free drilling device for PSU center tubes, comprising a drill bit body, a deburring tool (4), and a fixing sleeve (5), characterized in that: The drill bit body includes an integrally formed shank (1) and a drill bit (2). A positioning drill (3) is provided at one end of the drill bit (2) away from the shank (1). Multiple arc-shaped grooves (21) are provided on the outer wall of the drill bit (2), and an end face cutting edge (22) is provided at the connection between the multiple arc-shaped grooves (21). The end face cutting edge (22) is located outside the positioning drill (3). A lateral cutting edge is also provided on the outer wall of the drill bit (2) between two adjacent arc-shaped grooves (21). Blade (23); The deburring knife (4) has a positive blade and a negative blade. A mounting groove (11) is provided on the handle (1), and an elastic element is provided in the mounting groove (11). The deburring knife (4) is telescopically mounted in the mounting groove (11) through the elastic element. The fixing sleeve (5) is provided on the handle (1) for limiting and fixing the deburring knife (4). A dust collection mechanism (6) corresponding to the positioning drill (3) and the deburring knife (4) is also provided in the drill bit body.

2. The burr-free drilling device for PSU center tubes according to claim 1, characterized in that: The dust collection mechanism (6) includes a negative pressure hole (61) arranged along the axial direction of the drill bit body, and a first dust collection hole (62) and a second dust collection hole (63) communicating with the negative pressure hole (61). The negative pressure hole (61) is arranged along the center of the handle (1) and extends into the drill bit (2) near the side of the positioning drill (3). The first dust collection hole (62) is located in the arc-shaped groove (21) near the rear end of the positioning drill (3), and the second dust collection hole (63) is located on the handle (1) near the front end of the deburring knife (4).

3. The burr-free drilling device for PSU center tubes according to claim 2, characterized in that: Two arc-shaped grooves (21) are provided, and the two arc-shaped grooves (21) are arranged symmetrically in a spiral shape on the outer wall of the drill bit (2); two first dust suction holes (62) and two second dust suction holes (63) are provided respectively. The two first dust suction holes (62) are arranged symmetrically in the arc-shaped groove (21) near the rear end of the positioning drill (3), while the two second dust suction holes (63) are arranged symmetrically on the handle (1) near the front end of the deburring knife (4).

4. The burr-free drilling device for PSU center tubes according to claim 3, characterized in that: A recessed receiving cavity (24) is provided at the end of the drill bit (2) away from the shank (1). The positioning drill (3) is located at the center of the receiving cavity (24), and the positioning drill (3) and the drill bit (2) are integrally formed. The end face cutting edge (22) is divided into two symmetrically arranged end face cutting edges (22) by two arc grooves (21). Each end face cutting edge (22) includes a top cutting edge (221) and a transition cutting edge (222). The top cutting edge (221) and the transition cutting edge (222) form a stepped structure. The two end face cutting edges (22) together with the positioning drill (3) through the top cutting edge (221) and the transition cutting edge (222) form a two-flute three-point drill bit structure.

5. The burr-free drilling device for PSU center tubes according to claim 4, characterized in that: The positioning drill (3) is configured as a conical structure, with a positioning drill tip at the front end and a cylindrical part at the rear end, and multiple uniformly arranged cutting surfaces (31) are provided on the outer side of the positioning drill tip; a chip removal space is formed between the cutting surfaces (31) and the receiving cavity (24).

6. The burr-free drilling device for PSU center tubes according to claim 1, characterized in that: The elastic element in the mounting groove (11) is a return spring, and a support post is provided on the back of the deburring knife (4). The return spring is sleeved in the support post, and the deburring knife (4) is installed in the mounting groove (11) through the support post. Under the action of the return spring, it is in an outward convex state on the outer wall of the knife handle (1). Under the action of external force, the deburring knife (4) can retract inward into the mounting groove (11).

7. The burr-free drilling device for PSU center tubes according to claim 6, characterized in that: The deburring knife (4) includes an integrally formed mounting part (41) and a cutting edge part (42). The mounting part (41) is configured as a strip block structure. The support column is located on the back of the mounting part (41). The deburring knife (4) is movably mounted in the mounting groove (11) through the mounting part (41). The cutting edge part (42) is located on the outer side of one end of the mounting part (41) and is located on the outer wall of the handle (1) in an outward convex state. There is an inclined cutting edge surface at both ends of the cutting edge part (42), one of which is a positive cutting edge and the other is a negative cutting edge. The deburring knife (4) realizes the deburring operation of the PSU center tube through the positive cutting edge and the negative cutting edge.

8. The burr-free drilling device for PSU center tubes according to claim 7, characterized in that: The handle (1) is also provided with a positioning groove (12) that communicates with the mounting groove (11). The mounting part (41) of the deburring knife (4) is movably installed in the mounting groove (11) through the positioning groove (12) and is in contact with the spring in the mounting groove (11). The fixing sleeve (5) is provided with a fastening screw (51). The fixing sleeve (5) is provided with a threaded hole that matches the fastening screw (51). The fastening screw (51) is screwed into the threaded hole and is in contact with the mounting part (41) in the positioning groove (12). The fixing sleeve (5) limits and fixes the deburring knife (4) through the fastening screw (51).

Images