Burr-free drilling device for PSU central pipe and using method

Abstract

The invention discloses a burr-free drilling device for a PSU center pipe and a using method, the burr-free drilling device comprises a drill bit body, a burr removing cutter and a fixing sleeve, the drill bit body comprises a cutter handle and a drill bit, a positioning drill is arranged at the end of the drill bit, a plurality of arc-shaped grooves are formed in the outer wall of the drill bit, and end face cutting edges are arranged at the joints of the arc-shaped grooves; a lateral cutting edge is also arranged on the outer wall of the drill bit; a mounting groove is formed in the knife handle, the deburring knife is telescopically arranged in the mounting groove, and the fixing sleeve is arranged on the knife handle and used for limiting and fixing the deburring knife; and a dust collection mechanism corresponding to the positioning drill and the deburring cutter is also arranged in the drill bit body. According to the burr-free drilling device and the using method, drilling operation and deburring operation are combined together, the machining cost can be reduced, the working efficiency can be improved, machined products meet the using requirements, and therefore the product quality is improved, and the burr-free drilling device is simple in overall structure, convenient to operate, reasonable in design and worthy of application and popularization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of processing of PSU center pipe in RO reverse osmosis membrane element, in particular to a non-burr drilling device for PSU center pipe and a using method thereof. BACKGROUND

[0002] RO reverse osmosis technology has been widely used in the field of household drinking water production, and the center pipe is an important part of the RO reverse osmosis membrane element. Among them, the center pipe made of PSU material has good heat resistance, corrosion resistance, hydrolysis resistance and good mechanical strength, and has outstanding advantages in high-salt, high-corrosion and high-temperature concentrated water treatment systems. PSU material is polyether sulfone material, which is a high-performance engineering plastic with various excellent physical and chemical properties, making it widely used in various industrial and medical applications. Since PSU (polyether sulfone) has good transparency, it is particularly suitable for applications requiring transparent or translucent appearance. In addition, since PSU (polyether sulfone) has good processing performance, it is easy to be processed into various shaped parts and products through injection molding, extrusion and molding processes, so the center pipe in the RO reverse osmosis membrane element is generally made of PSU material by injection molding.

[0003] The center pipe is located at the core position of the reverse osmosis membrane element and mainly bears the functions of collecting and guiding water. It collects water filtered by the coiled filter layer and delivers it to the membrane shell outlet to ensure efficient transmission of the produced water. Therefore, the center pipe is a key element to ensure water treatment efficiency. In order to realize the function of collecting produced water of the center pipe, the center pipe obtained by injection molding needs to process 4 rows of evenly distributed water seepage holes on its side wall. During the processing of the water seepage holes, the existing drill bit will frequently produce burrs during drilling, resulting in a large amount of rework and often missing rework problems, thus causing unqualified products to flow out.

[0004] Therefore, in order to reduce the processing cost, improve the drilling efficiency of the PSU center pipe, reduce the need for manual deburring operation after drilling, avoid missing rework problems, prevent unqualified products from flowing out, and also to improve the deburring efficiency, so that drilling and deburring operations can be completed in the same process, not only can reduce the clamping and fixing time, but also can improve the processing efficiency, in order to make the PSU center pipe product after drilling meet the use requirements and improve the product quality, it is necessary to improve the existing drill bit to provide a non-burr drilling device for PSU center pipe and a using method thereof. SUMMARY

[0005] The technical problem solved by the present application is to provide a burr-free drilling device with simple structure and convenient operation, which combines drilling and deburring operations together, and can improve the removal rate of debris during drilling and deburring operations, so as to reduce processing cost, improve work efficiency, and make the processed products meet the use requirements, thereby improving product quality.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a burr-free drilling device for PSU center pipe, comprising a drill bit body, a deburring cutter and a fixing sleeve, the drill bit body comprises an integrally formed cutter handle and a drill bit, a positioning drill is arranged at the end of the drill bit away from the cutter handle, a plurality of arc-shaped grooves are arranged on the outer wall of the drill bit, end face cutting edges are arranged at the connecting portions between the arc-shaped grooves, the end face cutting edges are located outside the positioning drill, and lateral cutting edges are further arranged on the outer wall of the drill bit between adjacent two arc-shaped grooves; the deburring cutter has a front cutting edge and a reverse cutting edge, an installation groove is arranged on the cutter handle, and an elastic member is arranged in the installation groove, the deburring cutter is arranged in the installation groove in an extendable manner through the elastic member, and the fixing sleeve is arranged on the cutter handle to limit and fix the deburring cutter; a dust collection mechanism corresponding to the positioning drill and the deburring cutter is further arranged in the drill bit body.

[0007] Further, the burr-free drilling device for PSU center pipe comprises a negative pressure hole arranged axially along the drill bit body, and a first dust collection hole and a second dust collection hole communicated with the negative pressure hole, wherein the negative pressure hole is arranged along the center of the cutter handle and extends into the drill bit near the positioning drill, the first dust collection hole is arranged in the arc-shaped groove near the rear end of the positioning drill, and the second dust collection hole is arranged on the cutter handle near the front end of the deburring cutter.

[0008] Further, the burr-free drilling device for PSU center pipe comprises two arc-shaped grooves arranged symmetrically in a spiral shape on the outer wall of the drill bit, and two first dust collection holes arranged in the arc-shaped groove near the rear end of the positioning drill in a symmetrical state, and two second dust collection holes arranged on the cutter handle near the front end of the deburring cutter in a symmetrical state.

[0009] Further, the application discloses a PSU center tube burr-free drilling device, which is characterized in that an inwardly recessed accommodating cavity is arranged at the end of the drill bit far away from the shank, the positioning drill is arranged at the center position of the accommodating cavity, and the positioning drill is in an integrated structure with the drill bit; the end face cutting edge is divided into two symmetrically arranged end face cutting edges through the two arc-shaped grooves, each of the end face cutting edges comprises a top face cutting edge and a transition face cutting edge, the top face cutting edge and the transition face cutting edge form a stepped structure, and the two end face cutting edges form a two-edge three-point drill bit structure through the top face cutting edge and the transition face cutting edge and the positioning drill.

[0010] Further, the application discloses a PSU center tube burr-free drilling device, which is characterized in that the positioning drill is arranged in a conical structure, the front end of the positioning drill is a positioning drill tip, the rear end of the positioning drill is a cylindrical part, and a plurality of uniformly arranged cutting faces are arranged on the outer side surface of the positioning drill tip; the cutting faces and the accommodating cavity form a chip removal space.

[0011] Further, the application discloses a PSU center tube burr-free drilling device, which is characterized in that the elastic element in the mounting groove is a reset spring, a supporting column is arranged on the back surface of the deburring tool, the reset spring is sleeved in the supporting column, the deburring tool is mounted in the mounting groove through the supporting column, and under the action of the reset spring, the deburring tool is in an outwardly protruding state on the outer wall surface of the shank; under the action of an external force, the deburring tool can be inwards retracted into the mounting groove.

[0012] Further, the application discloses a PSU center tube burr-free drilling device, which is characterized in that the deburring tool comprises an integrated mounting part and a blade part, the mounting part is arranged in a strip block structure, the supporting column is arranged on the back surface of the mounting part, the deburring tool is movably mounted in the mounting groove through the mounting part, the blade part is arranged on the outer side surface of one end of the mounting part and is in an outwardly protruding state on the outer wall surface of the shank, an obliquely arranged blade surface is arranged at the two end parts of the blade part, one of the blade surfaces is a positive blade, and the other is a negative blade; the deburring tool realizes the deburring operation on the PSU center tube through the positive blade and the negative blade.

[0013] Further, the application discloses a PSU center tube burr-free drilling device, which is characterized in that the shank is further provided with a positioning groove communicated with the mounting groove, the mounting part in the deburring tool is movably mounted in the mounting groove through the positioning groove and is in abutting contact with the spring element arranged in the mounting groove; the fixing sleeve is provided with a fastening screw, a threaded hole matched with the fastening screw is arranged in the fixing sleeve, the fastening screw is screwed into the threaded hole and is in abutting contact with the mounting part in the positioning groove, and the fixing sleeve realizes the limiting and fixing of the deburring tool through the fastening screw.

[0014] The application further discloses a use method of the burr-free drilling device for a PSU central pipe. S1: placing the PSU central pipe to be machined in a clamping mechanism on an existing drilling machine, and clamping and fixing the PSU central pipe to be machined; S2: when the PSU central pipe to be machined is clamped and fixed, the assembled burr-free drilling device is installed on a hollow main shaft of the existing drilling machine in advance, the main shaft center hole on the hollow main shaft is communicated with the dust collection mechanism in the burr-free drilling device, then a pipeline is used to connect the main shaft center hole with an external negative pressure pump, and a drill chip collecting bag is arranged at the end of the negative pressure pump; S3: starting the drilling machine, rotating the burr-free drilling device by the hollow main shaft, positioning the position to be drilled by the positioning drill first, then drilling the PSU central pipe by the end face cutting edge and the lateral cutting edge, and in the drilling process, the negative pressure pump is started, and the dust collection mechanism (6) is used to suck away the tiny drill chips generated in the drilling process under the negative pressure state until the drilling is completed; S4: when the drilling is completed, the rotating drill bit continues to move downward, the positive cutting edge in the deburring tool is used to remove the burrs on the outer wall of the hole of the PSU central pipe first, when the burrs on the outer wall of the hole of the PSU central pipe are removed, the drill bit continues to move downward, the deburring tool is pressed into the installation groove in the tool handle under the action of external force, then with the drill bit continuing to move downward, the deburring tool is popped out outward in the automatic resetting process of the elastic member, and the reverse cutting edge in the deburring tool is used to remove the burrs on the inner wall of the hole of the PSU central pipe; and in the deburring process, the dust collection mechanism is used to suck away the tiny drill chips generated in the deburring process under the continuous negative pressure state until the deburring is completed.

[0015] Further, in the drilling process in the step S3, the specific operation mode is as follows: in the rotating process of the burr-free drilling device driven by the hollow main shaft, the surface 3-5 mm of the PSU central pipe is approached at a speed of 10 m / min first, then the rotating speed is reduced to 1 m / min, the positioning drill tip of the positioning drill is aligned with the position to be drilled, then the end face cutting edge is used to drill into the PSU central pipe at a feeding speed of 0.08 mm / s, and the PSU central pipe is drilled by the end face cutting edge; when the end face cutting edge enters the PSU central pipe, the feeding speed is increased to 0.12 mm / s to speed up the production efficiency, when the end face cutting edge is 0.8-1.2 mm away from the inner wall of the PSU central pipe, the feeding speed is reduced to 0.08 mm / s again, and the end face cutting edge drills out the inner wall of the hole of the PSU central pipe 0.8-1.2 mm away from the inner wall of the hole of the PSU central pipe. In the deburring process of the step S4, the specific operation mode is that when the rotating drill bit continues to move downward until the positive cutting edge in the deburring cutter contacts the outer wall of the hole of the PSU central tube, first pause the movement for 0.5 seconds, use the positive cutting edge to remove the burr of the outer wall of the PSU central tube until the burr removal is completed, then make the drill bit continue to move downward, the deburring cutter is extruded into the installation groove in the cutter handle under the action of external force, and the deburring operation on the PSU central tube is no longer performed; when the deburring cutter continues to move with the drill bit, the deburring cutter is ejected outward in the automatic resetting process of the elastic member, at this time, after the reverse cutting edge in the deburring cutter contacts the inner wall of the hole of the PSU central tube, first pause the movement for 0.5 seconds, use the reverse cutting edge to remove the burr of the inner wall of the hole of the PSU central tube until the burr removal is completed; at the same time, in the whole deburring process, the micro drill chips generated in the deburring are sucked away by using the continuous negative pressure; finally, the drill bit is moved upward and out at a rotating speed of 0.2 mm / s, and the drilling and deburring work is completed.

[0016] Compared with the prior art, the PSU central tube burr-free drilling device and the using method have the beneficial effects that: the positioning drill is arranged on the end face of the drill bit, the arc-shaped grooves are arranged on the outer wall of the drill bit, the end face cutting edges are arranged at the connecting positions of the arc-shaped grooves, and the lateral cutting edges are arranged on the outer wall of the drill bit between the adjacent two arc-shaped grooves; the drill bit is accurately positioned by the positioning drill, and the drill chips generated when entering and leaving the hole can be reduced by the end face cutting edges on the two sides of the arc-shaped grooves; meanwhile, the dust suction mechanism is arranged, and the drill chips generated during drilling can be sucked away by the negative pressure; in addition, the retractable deburring cutter is arranged on the cutter handle, the positive cutting edge and the reverse cutting edge are arranged on the deburring cutter, the outer wall and the inner wall of the PSU central tube can be deburred after drilling by the positive cutting edge and the reverse cutting edge, the drill chips generated during deburring can be sucked away by the continuous negative pressure during the deburring process; finally, the rotating speed and the feeding speed are controlled during drilling and deburring, the slow feeding and slow exiting mode is adopted, the generation of burrs can be greatly reduced, and the product quality can be improved.

[0017] Therefore, the burr-free drilling device and the using method can combine drilling and deburring operations together, realize drilling and deburring operations by one-time clamping and fixing, improve the removal rate of drill chips during drilling and deburring operations, reduce the processing cost, improve the work efficiency, make the processed products meet the use requirements, improve the product quality, and have the simple overall structure, the convenient operation, the reasonable design, and the popularization and application value. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application will be further described in detail below with reference to the drawings.

[0019] Figure 1is a structural schematic diagram of the drilling device described in the present application; Figure 2 is Figure 1 is a structural schematic diagram of the drilling device described in the present application; Figure 3 is a structural schematic diagram of the drilling device described in the present application; Figure 1 ; Figure 4 is a structural schematic diagram of the drilling device described in the present application; Figure 2 ; Figure 5 is a structural schematic diagram of the drilling device described in the present application; Figure 6 is Figure 5 is a structural schematic diagram of the drilling device described in the present application;

[0020] As shown in the figure: 1-shank, 11-mounting groove, 12-positioning groove, 2-drill, 21-arc-shaped groove, 22-end face cutting edge, 221-top surface cutting edge, 222-transition surface cutting edge, 23-lateral cutting edge, 24-receiving cavity, 3-positioning drill, 31-cutting surface, 4-burr removing tool, 41-mounting portion, 42-tool edge portion, 5-fixing sleeve, 51-fastening screw, 6-dust collection mechanism, 61-negative pressure hole, 62-first dust collection hole, 63-second dust collection hole. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in detail by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0022] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the defined conditions that the present application can be implemented, so they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present application can produce and the purposes that the present application can achieve, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right" and the like used in the specification are only for the convenience of clear description, and are not used to limit the scope in which the present application can be implemented. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope in which the present application can be implemented.

[0023] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "provided with" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] It should be noted that the term "comprising" or any other variant is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or inherent to such a process, method, article or apparatus. Embodiment 1

[0025] As Figures 1 to 6 shown, the present embodiment provides a PSU center tube burr-free drilling device, which comprises a drill bit body, a deburring tool 4 and a fixing sleeve 5. The drill bit body comprises an integrally formed tool shank 1 and a drill bit 2. A positioning drill 3 is arranged at the end of the drill bit 2 away from the tool shank 1. A plurality of arc-shaped grooves 21 are arranged on the outer wall of the drill bit 2. An end face cutting edge 22 is arranged at the connection between the arc-shaped grooves 21. The end face cutting edge 22 is located outside the positioning drill 3. A lateral cutting edge 23 is further arranged on the outer wall of the drill bit 2 between adjacent two arc-shaped grooves 21. The deburring tool 4 has a positive blade and a reverse blade. An installation groove 11 is arranged on the tool shank 1. An elastic member is arranged in the installation groove 11. The deburring tool 4 is telescopically arranged in the installation groove 11 through the elastic member. The fixing sleeve 5 is arranged on the tool shank 1 to limit and fix the deburring tool 4. A dust collection mechanism 6 corresponding to the positioning drill 3 and the deburring tool 4 is further arranged in the drill bit body.

[0026] The dust collection mechanism 6 comprises a negative pressure hole 61 arranged axially along the drill bit body, and a first dust collection hole 62 and a second dust collection hole 63 communicated with the negative pressure hole 61. The negative pressure hole 61 is arranged along the center of the tool shank 1 and extends into the drill bit 2 near the positioning drill 3. The first dust collection hole 62 is arranged in the arc-shaped groove 21 near the rear end of the positioning drill 3. The second dust collection hole 63 is arranged on the tool shank 1 near the front end of the deburring tool 4.

[0027] Further, by adopting the provided drilling device for PSU center tube without burr, the two arc-shaped grooves 21 are symmetrically arranged on the outer wall of the drill bit 2 in a spiral shape; the first dust suction hole 62 and the second dust suction hole 63 are respectively provided with two, the two first dust suction holes 62 are arranged in the arc-shaped groove 21 close to the rear end of the positioning drill 3 in a symmetrical state, and the two second dust suction holes 63 are arranged on the shank 1 close to the front end of the burr removing knife 4 in a symmetrical state.

[0028] Further, in order to facilitate chip removal, by adopting the provided drilling device for PSU center tube without burr, an inwardly recessed accommodating cavity 24 is arranged at the end of the drill bit 2 away from the shank 1, the positioning drill 3 is arranged at the center position of the accommodating cavity 24, and the positioning drill 3 is an integral molding structure with the drill bit 2; the end face cutting edge 22 is divided into two symmetrically arranged end face cutting edges 22 by the two arc-shaped grooves 21, each of the end face cutting edges 22 includes a top face cutting edge 221 and a transition face cutting edge 222, the top face cutting edge 221 and the transition face cutting edge 222 form a stepped structure, and the two end face cutting edges 22 form a two-blade three-point drill structure with the positioning drill 3 through the top face cutting edge 221 and the transition face cutting edge 222.

[0029] Further, in order to facilitate positioning, by adopting the provided drilling device for PSU center tube without burr, the positioning drill 3 is arranged in a conical structure, the front end is a positioning drill tip, the rear end is a cylindrical part, and a plurality of uniformly arranged cutting faces 31 are arranged on the outer side surface of the positioning drill tip; a chip removal space is formed between the cutting face 31 and the accommodating cavity 24. The front end of the positioning drill tip can be conveniently contacted and positioned with the PSU center tube to be machined, so that subsequent drilling operation is facilitated.

[0030] Further, in order to meet the telescopic purpose of the burr removing knife 4 in the mounting groove 11, by adopting the provided drilling device for PSU center tube without burr, the elastic member in the mounting groove 11 is a return spring, a supporting column is arranged on the back of the burr removing knife 4, the return spring is sleeved in the supporting column, the burr removing knife 4 is installed in the mounting groove 11 through the supporting column, and under the action of the return spring, the burr removing knife 4 is located on the outer wall surface of the shank 1 in an outwardly protruding state, and under the action of external force, the burr removing knife 4 can be inwardly retracted into the mounting groove 11. The specific arrangement of the return spring and the supporting column on the back of the burr removing knife 4 is similar to the spring button in the existing telescopic umbrella, which is outwardly protruding under normal circumstances and can be inwardly retracted under the action of external force, which belongs to the conventional technical solution in the prior art, and thus is not described in detail here.

[0031] Further, the provided drilling device without burr for PSU center tube is used to realize the burr removing operation on the PSU center tube, and the burr removing tool 4 comprises an integrally formed mounting portion 41 and a blade portion 42, the mounting portion 41 is arranged in a strip block structure, the supporting column is arranged on the back surface of the mounting portion 41, the burr removing tool 4 is movably arranged in the mounting groove 11 through the mounting portion 41, the blade portion 42 is arranged on the outer side surface of one end of the mounting portion 41 and protrudes outward to be located on the outer wall surface of the tool handle 1, and the blade portion 42 is provided with an inclined blade surface at both ends, one of which is a positive blade and the other is a reverse blade, and the burr removing tool 4 realizes the burr removing operation on the PSU center tube through the positive blade and the reverse blade.

[0032] Meanwhile, the tool handle 1 is further provided with a positioning groove 12 communicated with the mounting groove 11, the mounting portion 41 of the burr removing tool 4 is movably arranged in the mounting groove 11 through the positioning groove 12 and is in abutting contact with the spring arranged 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 matched with the fastening screw 51, the fastening screw 51 is screwed in the threaded hole and is in abutting contact with the mounting portion 41 in the positioning groove 12, and the fixing sleeve 5 realizes the limiting and fixing of the burr removing tool 4 through the fastening screw 51.

[0033] Through the positioning groove 12 arranged on the tool handle 1 and the fixing sleeve 5, the rotating burr removing tool 4 can be limited to avoid the problem of flying outward during rotation, thereby improving the stability of the burr removing tool 4 and reducing the safety hazard. Embodiment 2

[0034] The provided use method of the drilling device without burr for PSU center tube comprises the following steps: S1: placing 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 clamping and fixing of the PSU center tube to be processed, the assembled drilling device without burr is installed on the hollow main shaft of the existing drilling machine, the main shaft center hole on the hollow main shaft is communicated with the dust collection mechanism 6 in the drilling device without burr, then the main shaft center hole is connected with the external negative pressure pump through a pipeline, and a drill chip collecting bag is arranged at the end of the negative pressure pump; S3: starting the drilling machine, rotating the drilling device without burr through the hollow main shaft, positioning the drilling position through the positioning drill 3, then realizing the drilling operation on the PSU center tube through the end face cutting edge 22 and the lateral cutting edge 23, and in the drilling process, starting the negative pressure pump, and under the negative pressure state, the dust collection mechanism 6 is used to suck away the tiny drill chips generated in the drilling process until the drilling is completed; S4: when the drilling is finished, the rotating drill bit 2 continues to move downward, first the positive blade in the deburring tool 4 is used to deburr the outer wall of the hole of the PSU central tube, when the deburring of the outer wall of the hole of the PSU central tube is finished, the drill bit 2 continues to move downward, the deburring tool 4 is pressed into the installation groove 11 in the tool handle 1 under the action of external force, then with the drill bit 2 continuing to move downward, the deburring tool 4 is ejected outward in the automatic resetting process of the elastic member, the reverse blade in the deburring tool 4 is used to deburr the inner wall of the hole of the PSU central tube; and in the deburring process, the dust suction mechanism 6 is used to suck away the tiny drill chips generated in the deburring process under the condition of continuous negative pressure until the deburring is finished.

[0035] Further, in order to reduce burrs and improve product quality during drilling and deburring, the rotation speed and feed speed need to be controlled in the use method provided by the embodiment, and slow feeding and slow discharging are adopted, and the specific operation mode is as follows: In the drilling process in step S3, the hollow spindle drives the burr-free drilling device to rotate, first the speed is 10 m / min to approach the upper surface of the PSU central tube by 3-5 mm, then the speed is reduced to 1 m / min, the positioning drill tip of the positioning drill 3 is aligned with the position to be drilled, then the feed speed is 0.08 mm / s to drill into the PSU central tube, the end face cutting edge 22 is used to drill the PSU central tube; when the end face cutting edge 22 enters the PSU central tube, the feed speed is increased to 0.12 mm / s to speed up the production efficiency, when the end face cutting edge 22 is 0.8-1.2 mm away from the inner wall of the PSU central tube, the feed speed is reduced to 0.08 mm / s again, until the end face cutting edge 22 drills out the position 0.8-1.2 mm away from the inner wall of the hole of the PSU central tube; In the deburring process in step S4, when the rotating drill bit 2 continues to move downward until the positive blade in the deburring tool 4 contacts the outer wall of the hole of the PSU central tube, first the movement is paused for 0.5 seconds, the positive blade is used to deburr the outer wall of the PSU central tube until the deburring is finished, then the drill bit 2 continues to move downward, the deburring tool 4 is pressed into the installation groove 11 in the tool handle 1 under the action of external force, and the deburring of the PSU central tube is no longer performed; when the deburring tool 4 continues to move with the drill bit 2, the deburring tool 4 is ejected outward in the automatic resetting process of the elastic member, at this time, the reverse blade in the deburring tool 4 contacts the inner wall of the hole of the PSU central tube, first the movement is paused for 0.5 seconds, the reverse blade is used to deburr the inner wall of the hole of the PSU central tube until the deburring is finished; at the same time, the tiny drill chips generated in the deburring process are sucked away by using the continuous negative pressure; finally, the drill bit 2 is moved upward at a rotation speed of 0.2 mm / s to exit, and the drilling and deburring work is finished.

[0036] The device and method for drilling PSU center tube without burr have the following advantages: the special drill head structure is adopted, the positioning drill is designed on the top of the drill head, the taper angle of the positioning drill is 60 degrees, and the taper angle of the end face cutting edge is 150 degrees, so that the special three-point two-edge structure is formed; the burr removing cutter is arranged in the shank, and the positive edge and the reverse edge are arranged in the burr removing cutter, so that the burr removing operation can be performed on the outer wall and the inner wall of the tube; and the dust suction mechanism is arranged, the dust suction mechanism is connected with the external negative pressure pump, and the burr generated in the drilling and burr removing stages can be removed.

[0037] The burr is caused by unstable processing or material plasticization at the inlet and outlet, and the material to be cut off is not cut off. In order to remove the burr, the positioning drill is arranged on the top of the drill head, the drill head is changed from the cantilever beam state to the simply supported beam state, so that the stability is greatly improved, the traditional integral drill point is changed into the two protruding sharp top edge structure, the sharp top edge cut is more neat, and the burr is not easy to be caused by the residual material. In the drilling and burr removing stages, the speed of the outer wall and the inner wall of the tube is reduced, so that the possibility of material being heated and plasticized is reduced, the plasticized material is not easy to be cut off to form the burr. In the actual manufacturing process, the positive edge and the reverse edge of the burr removing cutter can be designed as the 45-degree inclined structure, the 45-degree rotating edge can remove the burr generated in the drilling, the burr removing cutter is arranged in the installation groove in a telescopic mode through the elastic element, the positive edge removes the outer wall burr, the burr removing cutter is squeezed into the shank and does not work when the drill head moves downward, the burr removing cutter is expanded outward under the action of the elastic element when the center tube is drilled through, the reverse edge starts to work and removes the inner wall burr, the feeding is stopped and the rotation is kept, so that the burr is removed. The continuously supplied negative pressure can remove the generated debris, and the dust suction principle is similar to that of the dust collector.

[0038] Therefore, the burr-free drilling device and the using method have the following advantages: the drill bit is accurately positioned by the positioning drill, the drill chips are reduced when entering and leaving the hole by the end face cutting edges on both sides of the arc-shaped groove, the dust is sucked away by the dust suction mechanism through negative pressure, the burr is removed from the outer wall and the inner wall of the PSU center pipe by the telescopic deburring tool with the forward and reverse cutting edges, the rotation speed and the feeding speed are controlled during the drilling and the burring process, the burr is greatly reduced and the product quality is improved by the slow feeding and the slow leaving.

[0039] In conclusion, the burr-free drilling device and the using method combine the drilling and the burring operation together, the drilling and the burring operation are realized by one clamping and fixing, the chip removal rate is improved during the drilling and the burring operation, the processing cost is reduced, the work efficiency is improved, the processed product meets the use requirements, the product quality is improved, the overall structure is simple, the operation is convenient, the design is reasonable, and the burr-free drilling device and the using method are worth promoting and using.

[0040] The other details of the present application are well known to those skilled in the art.

[0041] The protection scope of the present application is not limited to the technical solutions disclosed in the specific embodiments, the above description is only the preferred embodiments of the present application, and does not limit the present application, any slight modification, equivalent replacement and improvement made according to the technical solutions of the present application should be included in the protection scope of the technical solutions of the present application.

Claims

1. A burr-free drilling device for PSU center tube, comprising a drill bit body, a deburring cutter (4) and a fixing sleeve (5), characterized in that: The drill bit body comprises an integrally formed shank (1) and drill bit (2), a positioning drill (3) is arranged at the end of the drill bit (2) away from the shank (1), a plurality of arc-shaped grooves (21) are arranged on the outer wall of the drill bit (2), and end face cutting edges (22) are arranged at the connecting portions between the arc-shaped grooves (21), the end face cutting edges (22) are located outside the positioning drill (3), and lateral cutting edges (23) are further arranged on the outer wall of the drill bit (2) between adjacent two arc-shaped grooves (21); the deburring tool (4) has a positive blade and a reverse blade, a mounting groove (11) is arranged on the shank (1), and an elastic member is arranged in the mounting groove (11), the deburring tool (4) is arranged in the mounting groove (11) in an extendable manner through the elastic member, and a fixing sleeve (5) is arranged on the shank (1) and used for limiting and fixing the deburring tool (4); a dust collection mechanism (6) corresponding to the positioning drill (3) and the deburring tool (4) is further arranged in the drill bit body.

2. A burr-free drilling apparatus for a PSU center tube according to claim 1, characterized in that: The dust collection mechanism (6) comprises a negative pressure hole (61) arranged in the axial direction of the drill bit body, and a first dust collection hole (62) and a second dust collection hole (63) in communication with the negative pressure hole (61), wherein the negative pressure hole (61) is arranged along the center of the shank (1) and extends into the drill bit (2) near the positioning drill (3), the first dust collection hole (62) is arranged in the arc-shaped groove (21) near the rear end of the positioning drill (3), and the second dust collection hole (63) is arranged on the shank (1) near the front end of the deburring tool (4).

3. A PSU center tube burrless drilling apparatus as defined in claim 2, wherein: The arc-shaped grooves (21) are arranged in two, and the two arc-shaped grooves (21) are symmetrically arranged on the outer wall of the drill bit (2) in a spiral shape; the first dust collection hole (62) and the second dust collection hole (63) are respectively provided with two, the two first dust collection holes (62) are arranged in the arc-shaped groove (21) near the rear end of the positioning drill (3) in a symmetrical state, and the two second dust collection holes (63) are arranged on the shank (1) near the front end of the deburring tool (4) in a symmetrical state.

4. A PSU center tube burrless drilling apparatus as defined in claim 3, wherein: An inwardly recessed accommodating cavity (24) is arranged at the end of the drill bit (2) away from the shank (1), the positioning drill (3) is arranged at the center position of the accommodating cavity (24), and the positioning drill (3) and the drill bit (2) are an integrally formed structure; the end face cutting edges (22) are divided into two symmetrically arranged end face cutting edges (22) by the two arc-shaped grooves (21), each end face cutting edge (22) comprises a top face cutting edge (221) and a transition face cutting edge (222), the top face cutting edge (221) and the transition face cutting edge (222) form a stepped structure, and the two end face cutting edges (22) and the positioning drill (3) form a two-blade three-point drill structure through the top face cutting edge (221) and the transition face cutting edge (222).

5. A PSU center tube burrless drilling apparatus as defined in claim 4, wherein: The positioning drill (3) is arranged in a conical structure, with a front end being a positioning drill tip and a rear end being a cylindrical part, and a plurality of uniformly arranged cutting surfaces (31) are arranged on the outer side surface of the positioning drill tip; the cutting surfaces (31) and the accommodating cavity (24) form a chip removal space.

6. A PSU center tube burrless drilling apparatus as defined in claim 1, wherein: The elastic member in the mounting groove (11) is a return spring, and a supporting column is arranged on the back surface of the deburring tool (4), the return spring is sleeved in the supporting column, the deburring tool (4) is mounted in the mounting groove (11) through the supporting column, and under the action of the return spring, the deburring tool (4) is in an outwardly protruding state on the outer wall surface of the tool handle (1), and under the action of external force, the deburring tool (4) can be inwardly retracted into the mounting groove (11).

7. A PSU center tube burrless drilling apparatus as defined in claim 6, wherein: The deburring tool (4) comprises an integral mounting part (41) and a blade part (42), the mounting part (41) is arranged in a strip block structure, the supporting column is arranged on the back surface of the mounting part (41), the deburring tool (4) is movably mounted in the mounting groove (11) through the mounting part (41), the blade part (42) is arranged on the outer side surface of one end of the mounting part (41) and is in an outwardly protruding state on the outer wall surface of the tool handle (1), and an obliquely arranged blade surface is arranged on both ends of the blade part (42), one of which is a positive blade and the other is a reverse blade, and the deburring tool (4) realizes the deburring operation on the PSU central pipe through the positive blade and the reverse blade.

8. A PSU center tube burrless drilling apparatus as defined in claim 7, wherein: A positioning groove (12) is further arranged on the tool handle (1) and communicates with the mounting groove (11), the mounting part (41) in the deburring tool (4) is movably mounted in the mounting groove (11) through the positioning groove (12) and is in abutting contact with the spring member arranged in the mounting groove (11); the fixing sleeve (5) is provided with a fastening screw (51), a threaded hole matched with the fastening screw (51) is arranged in the fixing sleeve (5), the fastening screw (51) is screwed into the threaded hole and is in abutting contact with the mounting part (41) in the positioning groove (12), and the fixing sleeve (5) realizes the limiting and fixing of the deburring tool (4) through the fastening screw (51).

9. A method of drilling a PSU center tube using the burr-free drilling apparatus according to any one of claims 1 to 8, characterized in that, The use method comprises the following steps: S1: placing the PSU central pipe to be machined in the clamping mechanism of the existing drilling machine, and clamping and fixing the PSU central pipe to be machined; S2: after the PSU central pipe to be machined is clamped and fixed, the assembled burr-free drilling device is installed on the hollow main shaft of the existing drilling machine, so that the main shaft center hole on the hollow main shaft communicates with the dust collection mechanism (6) in the burr-free drilling device, then a pipeline is used to connect the main shaft center hole with an external negative pressure pump, and a drill chip collection bag is arranged at the end of the negative pressure pump; S3: starting the drilling machine, rotating the burr-free drilling device by means of the hollow main shaft, positioning the drilling position by means of the positioning drill (3), and then realizing the drilling operation on the PSU central pipe by means of the end face cutting edge (22) and the lateral cutting edge (23), and in the drilling process, starting the negative pressure pump, and under the negative pressure state, using the dust collection mechanism (6) to suck away the tiny drill chips generated in the drilling process until the drilling is completed. S4: When the drilling is finished, the rotating drill bit (2) continues to move downward, first using the positive blade in the deburring tool (4) to deburr the outer wall of the hole of the PSU central tube, when the deburring of the outer wall of the hole of the PSU central tube is finished, the drill bit (2) continues to move downward, the deburring tool (4) is pressed into the installation groove (11) in the tool handle (1) under the action of external force, then with the drill bit (2) continuing to move downward, the deburring tool (4) is ejected outward in the automatic resetting process of the elastic member, and the counter-blade in the deburring tool (4) is used to deburr the inner wall of the hole of the PSU central tube; and in the deburring process, the micro-drilling chips generated in the deburring process are sucked away by the dust suction mechanism (6) under the condition of continuous negative pressure until the deburring is finished.

10. The method of use of claim 9, wherein: In the drilling process of the step S3, the specific operation mode is as follows: during the rotation of the hollow spindle driving the burr-free drilling device, first approach the upper surface of the PSU central tube by 3-5 mm at a speed of 10 m / min, then reduce the speed to 1 m / min, align the positioning drill tip of the positioning drill (3) to the position to be drilled, then drill into the PSU central tube at a feeding speed of 0.08 mm / s, and use the end face cutting edge (22) to drill the PSU central tube; when the end face cutting edge (22) enters the PSU central tube, increase the feeding speed to 0.12 mm / s to speed up the production efficiency, and when the end face cutting edge (22) is at a distance of 0.8-1.2 mm from the inner wall of the PSU central tube, reduce the feeding speed to 0.08 mm / s again, and the drilling of the end face cutting edge (22) can be finished when it reaches the position of 0.8-1.2 mm from the inner wall of the hole of the PSU central tube; In the deburring process of the step S4, the specific operation mode is as follows: when the rotating drill bit (2) continues to move downward until the positive blade in the deburring tool (4) contacts the outer wall of the hole of the PSU central tube, first pause for 0.5 seconds, deburr the outer wall of the PSU central tube by using the positive blade, until the deburring is finished, then make the drill bit (2) continue to move downward, the deburring tool (4) is pressed into the installation groove (11) in the tool handle (1) under the action of external force, and the deburring of the PSU central tube is no longer performed; when the deburring tool (4) continues to move with the drill bit (2), the deburring tool (4) is ejected outward in the automatic resetting process of the elastic member, at this time, the counter-blade in the deburring tool (4) contacts the inner wall of the hole of the PSU central tube, first pause for 0.5 seconds, deburr the inner wall of the hole of the PSU central tube by using the counter-blade, until the deburring is finished; at the same time, the micro-drilling chips generated in the deburring process are sucked away by using the continuous negative pressure; finally, the drill bit (2) is moved upward at a rotating speed of 0.2 mm / s to exit, and the drilling and deburring work is finished.

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