Blind hole machining tool with automatic chip removal structure

Abstract

The application discloses a blind hole machining tool with an automatic chip removal structure and belongs to the technical field of numerical control tool manufacturing, which comprises a drill body and a rod body. The outer wall of the rod body is provided with two first chip removal grooves which are spirally distributed. The outer wall of the drill head structure is provided with two mounting ports. Each mounting port is connected with a punching tool bit through a bolt. The lower end of the rod body is provided with an opening part. The opening part is rotatably connected with a trapping block. The sidewall of the trapping block is provided with two second chip removal grooves which are spirally distributed. The second chip removal grooves can be rotated to the positions corresponding to the lower ends of the first chip removal grooves and together form a chip removal channel. Through the application, the bottom of the chip removal groove can be effectively blocked by deflecting the trapping block when the tool is retracted and stopped during the blind hole drilling machining, so that the cutting chip is prevented from flowing back to the hole bottom due to gravity, the single retraction chip removal efficiency is improved, the number of reciprocating retraction is reduced, the tool tip wear, hole wall scratch and chip blocking risk are simultaneously relieved, and the efficiency and stability of the blind hole machining are improved.

Description

Technical Field

[0001] This invention belongs to the field of CNC tool manufacturing technology, and more specifically relates to a blind hole machining tool with an automatic chip removal structure. Background Technology

[0002] Blind hole machining tools are a type of specialized tool used to machine non-penetrating holes in workpieces, leaving a solid bottom. Common examples include twist drills, internal coolant drills, blind hole taps, and blind hole reamers. Unlike through hole machining tools, these tools need to be adapted to the closed internal cavity of blind holes, taking into account the hole bottom shaping, chip removal space, and tool tip strength. Some tools are designed with chip flutes, so that chips can only be discharged from the hole opening along the tool flutes during machining. Blind hole taps and other tools also shorten the cutting cone length to avoid touching the solid bottom of the hole, preventing tool breakage and out-of-tolerance hole bottom dimensions, thereby completing blind hole shaping operations such as drilling, tapping, and reaming.

[0003] Intermittent retraction drilling, or chip removal, is a common process in metal blind hole drilling. The main workflow is as follows: the tool does not feed to the target hole depth in one go. Instead, it pauses feeding after drilling a preset depth, partially or completely withdrawing the tool from the hole. The drill bit's spiral chip removal grooves then carry the chips out of the hole cavity. After the chips are removed, the tool resumes feeding, and drilling continues in this cycle until the required hole depth is reached. This process is typically used in blind hole machining scenarios with large depth-to-diameter ratios, as well as some machining processes where the use of cutting fluid is limited. The reason for the widespread use of intermittent retraction is that blind holes are closed cavity structures. If drilling is done with continuous feed, chips easily accumulate and compress at the bottom of the hole, accelerating tool wear and potentially causing out-of-tolerance hole diameters or even tool breakage. Intermittent retraction, without requiring additional equipment upgrades, can significantly alleviate the chip removal pressure in blind holes.

[0004] However, there are also limitations in actual processing. During each retraction and chip removal process, some chips still cannot leave the chip groove and the hole opening. They will flow back along the chip groove under their own gravity and fall back to the bottom of the hole. During the subsequent drilling feed, these fallen chips will be squeezed to the bottom of the hole by the tool tip. As the number of processing times increases, they will gradually accumulate, often causing chip blockage, which will increase the tool load and affect the processing quality of the hole wall. Summary of the Invention

[0005] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. Specifically, it offers a blind hole machining tool with an automatic chip removal structure. This solves the problem mentioned in the background section where, during intermittent retraction and chip removal, some chips fall back to the bottom of the hole along the chip removal groove as the drill bit moves upwards and retracts, easily leading to chip blockage with increasing hole machining cycles.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A blind hole machining tool with an automatic chip removal structure includes a drill body and a rod body. The drill body includes a drill bit structure and an inner liner structure. The rod body is sleeved on the inner liner structure of the drill body. The outer wall of the rod body is provided with two spirally distributed first chip removal grooves. The outer wall of the drill bit structure is provided with two mounting ports, which are symmetrical about the center point of the drill bit structure. Each mounting port is connected to a drilling head by bolts. The drilling head includes a bending main body. The lower edge and corner of the bending main body are provided with a cutting part and a cutting part, and the cutting part is located at the upper end of the cutting part. Multiple arc-shaped separation parts of different sizes are provided between the two inner sides of the bending main body. The symmetrically arranged drilling heads achieve graded processing of cutting. The lower end of the rod body is provided with an opening, and a retaining block is rotatably connected inside the opening. The retaining block is sleeved on the inner lining structure of the drill body, and a bearing is provided in the gap between the retaining block and the inner lining structure. Two spirally distributed second chip removal grooves are provided on the side wall of the retaining block. The second chip removal grooves can rotate to a position corresponding to the lower end of the first chip removal groove and together form a chip removal channel. A cut-off part is provided on the upper side of the retaining block, and the cut-off part can rotate to the lower end of the first chip removal groove. Through the design of the retaining block, this application realizes that the bottom of the chip removal groove is automatically closed each time the drill is withdrawn and stopped during the pecking process.

[0007] Preferably, the upper side of the interception block is also provided with two arc-shaped grooves. The two arc-shaped grooves are symmetrically distributed around the center point of the upper side of the interception block. Each arc-shaped groove is provided with an arc-shaped guide post and a reset spring sleeved on the arc-shaped guide post. One end of the reset spring is connected to the inner wall of the arc-shaped groove. By sleeved on the arc-shaped guide post, the deformation trajectory of the reset spring is constrained.

[0008] Preferably, each of the reset springs is provided with a sliding block at the other end. The sliding block slides on the arc-shaped guide post. Through the cooperation between the sliding block, the reset spring and the arc-shaped guide post, the movement direction and trajectory of the sliding block are constrained by the arc-shaped guide post during the rotation and the tool retraction process.

[0009] Preferably, the upper side of the sliding block is provided with an insert block, the insert block is engaged with a slot, the slot is provided on the upper side of the opening of the rod body, and the slots are arranged at equal intervals and divided into two groups. The two groups of slots are centrally symmetrically distributed with respect to the dot of the opening. Through the cooperation between the slot and the insert block, the intercepting block can be quickly installed in the opening at the lower end of the rod body.

[0010] Preferably, the thickness of the sliding block is less than the distance between the end of the arc-shaped guide post and the corresponding side wall of the arc-shaped groove, so as to leave enough installation space to install the reset spring and the sliding block onto the arc-shaped guide post one after the other.

[0011] Preferably, the cutting part and the slicing part of the punching head are a double-beveled sharp edge structure and a comb-shaped cutting tooth structure, respectively. The cutting part is mainly used to cut the ribbon-like chips generated by the hole. Then, the slicing part uses the comb-shaped structure to cut the ribbon-like chips into finer chips with more uniform size, which reduces the probability of chips getting stuck or tangled in the chip discharge groove of the spiral structure.

[0012] Preferably, the lower edge of the arc-shaped separating section is provided with a bevel, which serves as a guide, facilitating the entry of debris into the arc-shaped separating section and its passage through it.

[0013] Preferably, the back of the bending main body is provided with a protrusion that fits into the mounting opening of the drill bit structure. Through the cooperation between the protrusion and the mounting opening, the stability of the drilling cutter head installed on the drill body is improved.

[0014] Preferably, the drill bit structure of the drill body is provided with multiple mounting holes, and the mounting holes are connected to the screw holes at the bottom of the rod body by bolts. The mounting holes are inserted from the side of the drill bit structure and then pass through the round hole on the upper side of the drill bit structure to connect with the bottom of the rod body.

[0015] Preferably, the upper end of the rod is provided with a joint, and the joint is connected to the upper end of the inner lining structure of the drill body and the upper end of the rod body by bolts, which improves the stability of the connection between the joint, the rod body and the drill body.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting up the intercepting block, the present invention realizes that during the intermittent retraction of the tool in the blind hole drilling process, the deflection action of the intercepting block forms a blocking barrier at the bottom of the chip removal groove, which stably restricts the chips that rise with the spiral structure chip removal groove inside the groove and brings them out of the hole along with the tool. This effectively prevents the chips from sliding down the chip removal groove and flowing back to the bottom of the hole due to gravity, improves the chip removal efficiency of a single retraction, reduces the number of reciprocating retractions required to clean the chips in the hole, and makes the overall processing rhythm more compact. Meanwhile, reducing the amount of residual chips at the bottom of the hole can also reduce the repeated squeezing and cutting of chips, which helps to slow down the wear rate of the tool tip and reduce the probability of the hole wall being scratched by residual chips. This has a positive effect on reducing the risk of chip blockage and tool breakage, and improving the dimensional stability and surface finish of blind hole machining.

[0017] (2) The present invention achieves a graded cutting path by using the cutting part, the cutting part and the arc-shaped separation part to form a drilling head. The ribbon-shaped chips generated by the main cutting are first cut into finer chips with more uniform size by the comb-shaped cutting part, and then enter the chip removal channel by the combing constraint of the arc-shaped separation part. This avoids large-sized rolled chips and long strip chips from directly entering the chip removal groove. The chip fragmentation process reduces the probability of chips getting stuck and entangled in the spiral chip removal groove, making chip removal smoother during the drilling process. Secondly, the finer chips are less likely to get embedded in the gap between the retaining block and the rod, which can reduce the jamming and sticking when the retaining block deflects and resets, further ensuring the stability of the chip removal blocking function and avoiding the decrease in the protective effect of chip backflow due to structural jamming.

[0018] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is an overall exploded view of the present invention; Figure 3 This is a schematic diagram of the drill body of the present invention; Figure 4 This is a schematic diagram of the punching head of the present invention; Figure 5 This is a schematic diagram of the chip removal channel formed by the intercepting block and the rod body of the present invention; Figure 6 This is a schematic diagram of the connection between the interception block and the rod body according to the present invention; Figure 7 This is a schematic diagram of the bottom of the rod body of the present invention; Figure 8 This is a schematic diagram of the bottom plane of the rod body of the present invention; Figure 9 This is an exploded view of the internal structure of the interception block of the present invention; Figure 10 This is a top view of the interception block of the present invention; Figure 11 This is a schematic diagram of the cut-off portion of the intercepting block of the present invention cutting off the bottom of the first chip removal groove.

[0020] In the diagram: 1. Drill body; 11. Drill bit structure; 111. Mounting port; 112. Mounting hole; 12. Liner structure; 2. Rod body; 21. First chip removal groove; 22. Opening; 23. Slot; 3. Drilling head; 31. Bending main body; 311. Cutting part; 312. Cutting section; 32. Arc-shaped separation part; 321. Bevel; 33. Protrusion; 4. Cutting block; 41. Second chip removal groove; 42. Cut-off part; 43. Arc-shaped groove; 44. Arc-shaped guide post; 45. Return spring; 46. Sliding block; 461. Insert block; 5. Connector; 6. Bearing. Detailed Implementation

[0021] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] For the implementation examples, please refer to the appendix. Figure 1 -Appendix Figure 11As shown, a blind hole machining tool with an automatic chip removal structure includes a drill body 1 and a rod body 2. The drill body 1 includes a drill bit structure 11 and an inner liner structure 12. The rod body 2 is sleeved on the inner liner structure 12 of the drill body 1. The outer wall of the rod body 2 is provided with two spirally distributed first chip removal grooves 21. The outer wall of the drill bit structure 11 is provided with two mounting ports 111, which are symmetrical about the center point of the drill bit structure 11. Each mounting port 111 is bolted to a drilling head 3. The drilling head 3 includes a bending main body 31. The lower edge and corners are provided with cutting parts 311 and cutting parts 312, and the cutting parts 312 are located at the upper end of the cutting parts 311. Multiple arc-shaped separation parts 32 of different sizes are provided between the two inner sides of the bending main body 31. The centrally symmetrically arranged drilling heads 3 realize the graded processing of cutting, making the chips more uniform and fine, avoiding large-sized curled chips and long strip chips from directly entering the chip discharge groove, reducing the probability of chips getting stuck in the spiral structure chip discharge groove, making chip discharge during the drilling process smoother, and avoiding the decrease in the protection effect of chip backflow due to structural jamming. The lower end of the rod body 2 is provided with an opening 22, and a retaining block 4 is rotatably connected inside the opening 22. The retaining block 4 is sleeved on the inner lining structure 12 of the drill body 1, and a bearing 6 is provided in the gap between the retaining block 4 and the inner lining structure 12. Two spirally distributed second chip removal grooves 41 are provided on the side wall of the retaining block 4. The second chip removal grooves 41 can rotate to a position corresponding to the lower end of the first chip removal groove 21 and together form a chip removal channel. A cut-off part 42 is provided on the upper side of the retaining block 4, and the cut-off part 42 can rotate to the lower end of the first chip removal groove 21. In blind hole pecking drilling, although intermittent retraction can rely on the spiral structure of the chip removal grooves to carry out some chips, due to the influence of gravity, some chips will follow the chip removal grooves. Chips falling back to the bottom of the hole not only weaken the chip removal effect of a single retraction, but also often require more retractions to maintain cleanliness inside the hole. This reduces the processing pace and makes it easy for residual chips at the bottom of the hole to be repeatedly squeezed, causing accelerated wear of the drill bit 3, scratching of the hole wall, and even chip blockage and tool breakage. This application, through the design of the retaining block 4, achieves automatic sealing of the bottom of the chip removal groove each time the drill stops during the pecking process, lifting the chips stuck in the groove and bringing them out of the hole synchronously with the tool. This effectively reduces the amount of chips falling back to the bottom of the hole. This method can improve the chip removal efficiency of a single retraction, reduce unnecessary retractions, and to a certain extent speed up the processing pace of blind holes, improving the surface finish and dimensional stability of blind holes.

[0025] The specific operation is as follows: The connector 5, drill body 1, and rod body 2 of the entire tool set are fastened together by bolts and can rotate synchronously. The inner liner structure 12 of the drill body 1 is equipped with a retaining block 4 through a bearing 6. The retaining block 4 and the rod body 2 are linked by a sliding block 46 and a return spring 45. In the initial static state, the cut-off part 42 of the retaining block 4 covers the lower end of the first chip removal groove 21 of the rod body 2 (as shown in the attached figure). Figure 11 (as shown) When the cutting tool is started and the rotation speed is gradually increased, the retaining block 4, connected to the drill body 1 via the bearing 6, will initially maintain static inertia and will not immediately rotate synchronously with the rod 2. As the rod 2 continues to rotate, the sliding block 46 on the rod 2 gradually compresses the return spring 45, and the spring force gradually pushes the retaining block 4 to rotate with the rod 2. When the cutting tool speed increases to the set value and remains stable, the return spring 45 is compressed to its maximum deformation by the sliding block 46, and the relative angle between the rod 2 and the retaining block 4 no longer changes. The two enter a dynamic equilibrium state of synchronous rotation. At this time, the second chip removal groove 41 on the retaining block 4 aligns one-to-one with the first chip removal groove 21 on the outer wall of the rod 2, together forming a continuous spiral chip removal channel (as shown in the attached figure). Figure 5 (As shown).

[0026] After the chip removal channel is fully open, the driving tool moves downward to carry out blind hole drilling. The drilling head 3 at the end of the drill body 1 rotates and cuts into the workpiece. First, the cutting part 311 with double inclined sharp edge structure completes the main cutting. When the generated chips move upward, they will be cut into finer short chips by the cutting part 312 with comb-shaped cutting teeth structure. Then the chips pass through the separation part and enter the open chip removal channel. With the help of the spiral conveying action of the rotating tool, they are continuously discharged from the upper end of the blind hole along the channel. When the tool feeds to the set depth, the rotation drive stops, the return spring 45 loses its compressive force and rebounds, causing the retaining block 4 to deflect, so that the cut-off part 42 of the retaining block 4 moves back to the lower end of the first chip removal groove 21 (as shown in the attached figure). Figure 11 As shown, the bottom of the chip removal channel is blocked, and then the tool moves upward and retracts. The chips that remain in the first chip removal groove 21 will be supported by the bottom cut-off part 42 and will not flow back to the bottom of the hole due to gravity. They can be carried out of the hole along with the tool. This method can reduce the amount of chips that fall back to the bottom of the hole and reduce the probability of chip blockage when the tool is fed again. At the same time, it can improve the chip removal efficiency of a single retraction.

[0027] Please refer to the appendix carefully. Figure 7 -Appendix Figure 10As shown, two arc-shaped grooves 43 are also provided on the upper side of the interception block 4. The two arc-shaped grooves 43 are symmetrically distributed around the center point of the upper side of the interception block 4. Each arc-shaped groove 43 is provided with an arc-shaped guide post 44 and a return spring 45 sleeved on the arc-shaped guide post 44. One end of the return spring 45 is connected to the inner wall of the arc-shaped groove 43. By sleeved on the arc-shaped guide post 44, the deformation direction of the return spring 45 is constrained by the arc-shaped guide post 44 during the deformation process, and the deformation occurs along the direction of the arc-shaped guide post 44, thereby ensuring that the return spring 45 is properly positioned in the later stages. When the rotation stops, the stability of the deflection force and the efficiency of the deflection response of the intercepting block 4 are ensured. Each of the reset springs 45 is provided with a sliding block 46 at the other end. The sliding block 46 slides on the arc-shaped guide post 44. Through the cooperation between the sliding block 46, the reset spring 45 and the arc-shaped guide post 44, the movement direction and trajectory of the sliding block 46 are constrained by the arc-shaped guide post 44 during the rotation and the process of stopping and retracting the tool. On this trajectory, a force is applied to the spring or the reset spring 45 is deformed and reset to apply a reverse force, thereby indirectly driving the intercepting block 4 to deflect. The upper side of the sliding block 46 is provided with an insert block 461, which engages with a slot 23. The slot 23 is located on the upper side of the opening 22 of the rod 2, and the slots 23 are equidistantly arranged in two groups. The two groups of slots 23 are centrally symmetrically distributed with respect to the dot of the opening 22. Through the cooperation between the slots 23 and the insert block 461, the intercepting block 4 can be quickly installed in the opening 22 at the lower end of the rod 2, and can be installed according to the parameters of the return spring 45 and the sliding block. At the initial position on the arc-shaped guide post 44, select a suitable slot 23 in each group to ensure that when the rotation stops, the cut-off part 42 of the intercepting block 4 blocks the bottom of the first chip removal groove 21. During high-speed and stable rotation, the first chip removal groove 21 and the second chip removal groove 41 can remain connected. The thickness of the sliding block 46 is less than the distance between the end of the arc-shaped guide post 44 and the corresponding side wall of the arc-shaped groove 43, providing space so that the sliding block 46 and the return spring 45 can be sleeved on the arc-shaped guide post 44.

[0028] Please refer to the appendix carefully. Figure 2 -Appendix Figure 4As shown, the cutting part 311 and the cutting part 312 of the drilling head 3 are respectively a double-beveled sharp edge structure and a comb-shaped cutting tooth structure. The cutting part 311 is mainly used to cut the ribbon-like chips generated by the hole. Then, the cutting part 312 uses the comb-shaped structure to cut the ribbon-like chips into finer chips with more uniform size, avoiding long strip chips from directly entering the chip removal groove. The chip fragmentation process reduces the probability of chips getting stuck and entangled in the spiral chip removal groove, making chip removal during the drilling process smoother. The lower edge of the arc-shaped separation part 32 is provided with a bevel 321, which facilitates the chips to pass through the gap between the arc-shaped separation parts 32. The back of the bending main body 31 is provided with a protrusion 33. Through the cooperation between the protrusion 33 and the mounting port 111, the stability of the drilling head 3 mounted on the drill body 1 is improved, ensuring safe and effective drilling. When drilling blind holes at high speed, the drill head will continuously bear cutting impact, radial vibration, and lateral force from chips. After the protrusion 33 is embedded in the mounting port 111, it can form a radial limit on the drilling head 3, which can reduce the possibility of the drill head shifting or loosening to a certain extent, and reduce the shaking caused by the assembly gap between the drill head and the drill body 1. At the same time, this mating structure can share part of the cutting load, reduce the load on the bolts or connectors at the assembly position, reduce the probability of loosening under long-term repeated cutting conditions, help maintain the cutting position accuracy of the drill head, reduce hole position shift, chipping and other phenomena caused by assembly deviations, and allow the entire tool set to continuously and stably complete the blind hole drilling operation. The drill bit structure 11 of the drill body 1 is provided with multiple mounting holes 112, and the mounting holes 112 are connected to the screw holes at the bottom of the rod body 2 by bolts, so that the bottom of the rod body 2 and the drill bit structure 11 of the drill body 1 are connected. The upper end of the rod body 2 is provided with a connector 5, and the connector 5 is connected to the upper end of the inner liner structure 12 of the drill body 1 and the screw holes at the upper end of the rod body 2 by bolts, which improves the stability of the connection between the connector 5, the rod body 2 and the drill body 1. Under the condition of high-speed rotating blind hole drilling, the tool as a whole will continuously bear the cutting reaction force and vibration impact. The fastening connection method can effectively constrain the relative displacement between the components, ensuring that the three always maintain a high degree of coaxiality, reducing radial runout and wobble caused by assembly gaps. This stable connection foundation not only makes the relative deflection action between the rod 2 and the intercepting block 4 more reliable, ensuring the stable effectiveness of the chip removal channel alignment and blocking function, but also reduces the probability of loosening of the connecting parts and misalignment of the assembly position during long-term repeated cutting, reducing problems such as hole position deviation and chipping caused by the cutting position deviation of the drill bit structure 11, and helps to maintain the machining accuracy and service life of the entire tool set.

[0029] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A blind hole machining tool with an automatic chip removal structure, comprising a drill body (1) and a rod body (2), wherein the drill body (1) comprises a drill bit structure (11) and an inner liner structure (12), and the rod body (2) is sleeved on the inner liner structure (12) of the drill body (1), wherein the outer wall of the rod body (2) is provided with two spirally distributed first chip removal grooves (21), characterized in that: The outer wall of the drill bit structure (11) is provided with two mounting ports (111). The two mounting ports (111) are symmetrical about the center point of the drill bit structure (11). Each mounting port (111) is connected to a drilling head (3) by bolts. The drilling head (3) includes a bending main body (31). The lower edge and corner of the bending main body (31) are provided with a cutting part (311) and a cutting part (312). The cutting part (312) is located at the upper end of the cutting part (311). Multiple arc-shaped separation parts (32) of different sizes are provided between the two inner sides of the bending main body (31). The lower end of the rod (2) is provided with an opening (22), and a retaining block (4) is rotatably connected inside the opening (22). The retaining block (4) is sleeved on the inner lining structure (12) of the drill body (1), and a bearing (6) is provided in the gap between the retaining block (4) and the inner lining structure (12). Two spirally distributed second chip removal grooves (41) are provided on the side wall of the retaining block (4). The second chip removal grooves (41) can be rotated to the position corresponding to the lower end of the first chip removal groove (21) and together form a chip removal channel. A cut-off part (42) is provided on the upper side of the retaining block (4), and the cut-off part (42) can be rotated to the lower end of the first chip removal groove (21).

2. The blind hole machining tool with automatic chip removal structure according to claim 1, characterized in that, The upper side of the interception block (4) is also provided with two arc-shaped grooves (43). The two arc-shaped grooves (43) are symmetrically distributed around the center point of the upper side of the interception block (4). Each arc-shaped groove (43) is provided with an arc-shaped guide post (44) and a reset spring (45) sleeved on the arc-shaped guide post (44). One end of the reset spring (45) is connected to the inner wall of the arc-shaped groove (43).

3. A blind hole machining tool with an automatic chip removal structure according to claim 2, characterized in that, Each of the reset springs (45) is provided with a sliding block (46) at the other end, and the sliding block (46) slides on the arc-shaped guide post (44).

4. A blind hole machining tool with an automatic chip removal structure according to claim 3, characterized in that, The upper side of the sliding block (46) is provided with a plug (461), the plug (461) is engaged with a slot (23), the slot (23) is provided on the upper side of the opening (22) of the rod (2), and the slots (23) are arranged at equal intervals and divided into two groups.

5. A blind hole machining tool with an automatic chip removal structure according to claim 4, characterized in that, The thickness of the sliding block (46) is less than the distance between the end of the arc-shaped guide post (44) and the corresponding side wall of the arc-shaped groove (43).

6. A blind hole machining tool with an automatic chip removal structure according to claim 1, characterized in that, The cutting part (311) and the cutting part (312) of the punching head (3) are respectively a double-beveled sharp edge structure and a comb-shaped cutting tooth structure.

7. A blind hole machining tool with an automatic chip removal structure according to claim 6, characterized in that, The lower edge of the arc-shaped separation section (32) is provided with a bevel (321).

8. A blind hole machining tool with an automatic chip removal structure according to claim 7, characterized in that, The back of the bending main body (31) is provided with a protrusion (33), which fits into the mounting port (111) of the drill bit structure (11).

9. A blind hole machining tool with an automatic chip removal structure according to claim 1, characterized in that, The drill bit structure (11) of the drill body (1) is provided with multiple mounting holes (112), and the mounting holes (112) are connected to the screw holes at the bottom of the rod body (2) by bolts.

10. A blind hole machining tool with an automatic chip removal structure according to claim 9, characterized in that, The upper end of the rod (2) is provided with a joint (5), and the joint (5) is connected to the upper end of the inner lining structure (12) of the drill body (1) and the upper end of the rod (2) by bolts respectively.

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