Drilling and milling positive and negative chamfer combined cutter

Abstract

The present application relates to a kind of drill milling positive and negative chamfer combined cutter, belong to hole processing cutter technical field;Including handle, be installed with tool bit in the lower end of handle, two symmetrical upper chamfer inserts are installed in the upper end of tool bit, retractable slot is provided in the lower end of tool bit, one lower chamfer insert is slidably arranged in the two ends of retractable slot inside respectively, two lower chamfer inserts are connected with tool bit by telescopic component, the telescopic component includes carrier, one carrier is slidably arranged in the two ends of retractable slot inside respectively, telescopic component drives two carriers to be far away from each other or mutually close, two lower chamfer inserts are respectively rotationally arranged on two carriers;Degree component is arranged between corresponding lower chamfer insert and carrier, lower chamfer insert is rotated by degree component in the sliding process of carrier driving lower chamfer insert;It solves the problem that only unilateral blade is continuously stressed when retractable chamfer cutter is chamfered.

Description

Technical Field

[0001] This invention belongs to the field of hole machining tool technology, specifically relating to a combination tool for drilling and milling positive and negative chamfering. Background Technology

[0002] CNC drilling and milling is the mainstream process for machining holes in flange-type workpieces. After drilling is completed, the upper edge chamfer of the hole can be completed simultaneously with the process using conventional tools, while the lower edge chamfer is handled separately using an independent process. The chamfering of the front and back sides of the hole is achieved through step-by-step processing, which is a conventional technical solution for hole chamfering in the field of machining.

[0003] In the actual production process of flange workpiece hole machining, the existing technology has adopted telescopic chamfering tools driven by the center water outlet, which can realize the telescopic avoidance of the lower chamfering insert and continuous machining in one clamping; however, such telescopic chamfering tools mostly adopt a fixed-position insert structure. While improving efficiency, the chamfering cutting is only subjected to continuous force on one side of the cutting edge. Long-term use will result in concentrated wear on one side, which accelerates the wear rate of the single edge, increases the frequency of insert replacement and regrinding, and increases tool maintenance costs and on-site maintenance pressure. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and proposes a combined drilling and milling tool for both positive and negative chamfering; it solves the problem that current telescopic chamfering tools only bear continuous force on one side of the cutting edge during chamfering.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0006] A drilling and milling combination tool for both positive and negative chamfering includes a tool holder, a tool head mounted at the lower end of the tool holder, two symmetrical upper chamfering inserts mounted at the upper end of the tool head, a telescopic groove provided at the lower end of the tool head, and a lower chamfering insert slidably mounted at each end of the telescopic groove. The two lower chamfering inserts are connected to the tool head via a telescopic assembly. The telescopic assembly includes a support frame, with a support frame slidably mounted at each end of the telescopic groove. The telescopic assembly drives the two support frames to move away from or towards each other, and the two lower chamfering inserts are rotatably mounted on the two support frames respectively. An indexing assembly is provided between the corresponding lower chamfering inserts and the support frames. When the support frame drives the lower chamfering inserts to slide outward from the telescopic groove, the indexing assembly drives the lower chamfering inserts to rotate. When the support frame drives the lower chamfering inserts to slide inward from the telescopic groove, the indexing assembly fixes the angle of the lower chamfering inserts.

[0007] Furthermore, the telescopic assembly also includes a pressure block, a drive shaft, and a lower pressure plate; an injection groove is provided on the upper inner side of the tool holder, and a sliding groove is provided in the middle inner side of the tool holder. The lower end of the injection groove is connected to the sliding groove. A pressure block is slidably arranged inside the sliding groove. A drive shaft is fixedly arranged at the lower end of the pressure block, and the lower end of the drive shaft extends into the telescopic groove. A lower pressure plate is fixedly arranged on both sides of the lower end of the drive shaft. A first contact slope is provided at the end of the two lower pressure plates away from the drive shaft. The lower end of the first contact slope is inclined towards the side closer to the axis of the drive shaft.

[0008] Furthermore, the telescopic assembly also includes a base; a base is fixedly installed at both ends inside the telescopic groove, and two support frames are slidably engaged with the two bases; the two support frames are respectively installed on both sides of the lower end of the drive shaft, and a second contact slope is provided at the end of the two support frames near the drive shaft, and the first contact slope on the two lower pressure plates slides in contact with the second contact slope on the support frame on the same side.

[0009] Furthermore, the telescopic assembly also includes a first return spring and a second return spring; a first return spring is provided at the lower end of the drive shaft, and the lower end of the first return spring is connected to the bottom surface inside the telescopic groove; a second return spring is provided between the two support frames and the inner walls at both ends of the telescopic groove.

[0010] Furthermore, corresponding isosceles trapezoidal grooves are provided on the top and bottom plates of the base. The isosceles trapezoidal grooves include a straight section in the middle and inclined sections at both ends. The straight section is parallel to the sliding direction of the support frame, and the ends of the two inclined sections away from the straight section are inclined toward the support frame.

[0011] Furthermore, the indexing assembly includes a force-bearing shaft, a limiting block, a T-shaped frame, and a positioning shaft; the same force-bearing shaft is slidably inserted into the two isosceles trapezoidal grooves, two limiting blocks are fixedly installed on the force-bearing shaft, and the two limiting blocks are slidably in contact with the inner top surface and inner bottom surface of the base, respectively; a T-shaped frame is fixedly installed in the middle of the force-bearing shaft, and a positioning shaft is fixedly installed on the T-shaped frame; a limiting hole is provided on the bearing frame, and the positioning shaft is slidably inserted into the limiting hole of the bearing frame.

[0012] Furthermore, the indexing assembly also includes a bearing shaft; the lower chamfering blade is located on the side of the bearing frame away from the base, the lower chamfering blade is a square plate structure, and cutting edges are provided at the four edges of the lower chamfering blade; a bearing shaft is fixedly provided at the center of the lower chamfering blade, the bearing shaft is rotatably inserted into the inside of the bearing frame, and four positioning holes are provided on the lower chamfering blade, the positioning shaft is slidably inserted into one of the positioning holes of the lower chamfering blade.

[0013] Furthermore, the indexing assembly also includes a ratchet, a toothed ring, a paddle, an arc spring, and a rack; a ratchet is fixedly mounted on the bearing shaft, a toothed ring is sleeved on the outside of the ratchet, and the toothed ring is rotatably mounted on the bearing frame; a paddle is rotatably mounted on the inner side of the toothed ring, the paddle engages with the ratchet teeth on the outside of the ratchet, an arc spring is provided between the paddle and the inner side of the toothed ring, and a rack is fixedly mounted on the top plate of the base; when the toothed ring slides under the rack along with the bearing frame, the toothed ring and the rack mesh.

[0014] Furthermore, a vertical settling trough is provided on the top surface inside the openings at both ends of the expansion joint, and a scraper is slidably inserted inside the settling trough.

[0015] The beneficial effects of this invention compared to the prior art are as follows: (1) The present invention uses the central liquid outlet pressure as the power source, which directly acts on the pressure block through the liquid injection tank, pushing the transmission shaft and the lower pressure plate to move down synchronously. The lower pressure plate pushes the support frame laterally to slide along the base. The inclined section of the isosceles trapezoidal groove squeezes the force shaft, driving the positioning shaft to pull out of the positioning hole to unlock the lower chamfering blade. Then the support frame drives the toothed ring and the rack to squeeze and mesh and rotate. The ratchet is driven by the paddle to rotate synchronously with the support shaft, completing the 90° indexing rotation of the lower chamfering blade. When the force shaft moves to the end of the straight section of the isosceles trapezoidal groove, the inclined section on the other side squeezes the force shaft again, pushing the positioning shaft to re-insert into the positioning hole to complete the locking. At the same time, the lower chamfering blade extends. The entire process can be completed without manual intervention, and drilling and chamfering on both sides can be completed in one clamping, simplifying the processing process and improving processing efficiency.

[0016] (2) The present invention relies on the elastic restoring force of the first and second return springs to drive the pressure block, transmission shaft and bearing frame to return to their original positions synchronously along the original transmission path. During the reset process, the toothed ring rotates in the opposite direction to drive the paddle to retract inward, without driving the ratchet to reverse, thus firmly maintaining the indexing angle of the lower chamfer blade. At the same time, the positioning shaft is continuously inserted and locked to ensure the stability of the structure after the tool is reset, turning the concentrated wear on one side of the blade into balanced wear on all four sides, reducing the maintenance frequency, and ensuring the long-term stable operation of the tool. Meanwhile, the scraper plate moves up and down with the blade, which not only blocks the internal channel of the blade head to prevent metal chips from entering, but also scrapes off the residual chips on the surface of the blade, ensuring the stable operation of the structure. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the structure of the handle and blade after being partially cut in half. Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This is a schematic diagram of the connection between the lower chamfering blade, the support frame, the base, and the load-bearing shaft. Figure 1 ; Figure 5 This is a schematic diagram of the connection between the lower chamfering blade, the support frame, the base, and the load-bearing shaft. Figure 2 ; Figure 6 This is a schematic diagram showing the connection between the lower chamfering blade, the base, and the indexing assembly; Figure 7 This is a schematic diagram showing the connection between the support frame, the support shaft, the ratchet, and the gear ring; Figure 8 yes Figure 7 A magnified view of a portion of point B in the middle; Among them, 1 is the handle, 2 is the blade, 3 is the upper chamfered blade, 4 is the lower chamfered blade, 501 is the liquid injection tank, 502 is the pressure block, 503 is the drive shaft, 504 is the lower pressure plate, 505 is the first return spring, 506 is the base, 507 is the bearing frame, 508 is the second return spring, 601 is the isosceles trapezoidal groove, 602 is the force-bearing shaft, 603 is the limiting block, 604 is the T-shaped frame, 605 is the positioning shaft, 606 is the limiting hole, 607 is the bearing shaft, 608 is the positioning hole, 609 is the ratchet, 610 is the gear ring, 611 is the paddle, 612 is the arc spring, 613 is the rack, 614 is the settling tank, and 615 is the scraper. Detailed Implementation

[0018] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0019] like Figure 1As shown in Figure 8, this invention provides a combined drilling and milling tool for both positive and negative chamfering, including a tool holder 1, a tool head 2 mounted on the lower end of the tool holder 1, two symmetrical upper chamfering inserts 3 mounted on the upper end of the tool head 2, a telescopic groove provided at the lower end of the tool head 2, and a lower chamfering insert 4 slidably mounted at each end of the telescopic groove. The two lower chamfering inserts 4 are connected to the tool head 2 through a telescopic assembly. The telescopic assembly includes a support frame 507, with a support frame 507 slidably mounted at each end of the telescopic groove. The telescopic assembly drives the two support frames 507 to move away from or towards each other, and the two lower chamfering inserts 4 are rotatably mounted on the two support frames 507 respectively. An indexing assembly is provided between the corresponding lower chamfering inserts 4 and the support frames 507. When the support frames 507 drive the lower chamfering inserts 4 to slide outward from the telescopic groove, the indexing assembly drives the lower chamfering inserts 4 to rotate. When the support frames 507 drive the lower chamfering inserts 4 to slide inward from the telescopic groove, the indexing assembly fixes the angle of the lower chamfering inserts 4.

[0020] The axes of the handle 1 and the blade 2 coincide and remain vertical.

[0021] The extension direction of the telescopic groove is kept horizontal. The width of the openings at both ends of the telescopic groove is smaller than the width of its inner cavity, and the width of the openings at both ends of the telescopic groove is slightly larger than the width of the lower chamfering blade 4, so as to ensure that the lower chamfering blade 4 can smoothly extend outward from the opening at the end of the telescopic groove.

[0022] The telescopic assembly also includes a pressure block 502, a drive shaft 503, a lower pressure plate 504, a first return spring 505, a base 506, and a second return spring 508.

[0023] A liquid injection groove 501 is provided on the upper inner side of the tool holder 1. The axis of the liquid injection groove 501 coincides with the axis of the tool holder 1, and the upper opening of the liquid injection groove 501 is connected to the upper end face of the tool holder 1. A sliding groove is provided in the middle of the inner side of the tool holder 1. The lower end of the liquid injection groove 501 is connected to the upper end of the sliding groove. A pressure block 502 is slidably arranged inside the sliding groove along the axis of the tool holder 1. The outer side of the pressure block 502 is in sliding contact with the inner side of the sliding groove. A drive shaft 503 is fixedly arranged at the lower end of the pressure block 502. The axis of the drive shaft 503 coincides with the axis of the tool holder 1, and the lower end of the drive shaft 503 extends into the telescopic groove. A lower pressure plate 504 is fixedly arranged on both sides of the lower end of the drive shaft 503. A first contact slope is provided at the end of each lower pressure plate 504 away from the drive shaft 503. The lower end of the first contact slope is inclined towards the side closer to the axis of the drive shaft 503.

[0024] A base 506 is fixedly installed at each end of the inner side of the expansion groove. The two bases 506 are respectively positioned on one side of two support frames 507, and the two support frames 507 are slidably engaged with the two bases 506 along the extension direction of the expansion groove. The two support frames 507 are respectively positioned on both sides of the lower end of the drive shaft 503, and each support frame 507 has a second contact slope near the drive shaft 503. The first contact slopes on the two lower pressure plates 504 slide in contact with the second contact slopes on the support frames 507 on the same side.

[0025] A vertical first return spring 505 is provided at the lower end of the drive shaft 503. The upper end of the first return spring 505 is connected to the lower end of the drive shaft 503, and the lower end of the first return spring 505 is connected to the bottom surface of the telescopic groove. A second return spring 508 is provided between each of the two support frames 507 and the inner walls at both ends of the telescopic groove. One end of the second return spring 508 is connected to the end of the support frame 507 on the same side away from the drive shaft 503, and the other end of the second return spring 508 is connected to the inner wall of the telescopic groove.

[0026] In the initial state, both the first return spring 505 and the second return spring 508 are in the reset state. At this time, the pressure block 502 and the drive shaft 503 are located at the uppermost position, the lower pressure plate 504 is at the highest point relative to the support frame 507, and the two support frames 507 are located at the innermost position of the telescopic groove, thereby driving the two lower chamfering blades 4 to retract completely into the telescopic groove.

[0027] Liquid is injected into the injection tank 501, maintaining a certain hydraulic pressure inside. Under the action of hydraulic pressure, the pressure block 502 slides downward inside the sliding groove, thereby driving the drive shaft 503 and the lower pressure plates 504 on both sides of the lower end of the drive shaft 503 to slide downward, compressing the first return spring 505. The first contact slopes on the two lower pressure plates 504 press against the second contact slopes on the same side of the support frame 507, causing the two support frames 507 to move away from each other along the base 506. The two support frames 507 drive the two lower chamfering blades 4 to move away from each other, compressing the second return spring 508 until the two lower chamfering blades 4 extend outward from the openings at both ends of the telescopic groove.

[0028] After the injection into the injection tank 501 stops, the hydraulic pressure applied inside the injection tank 501 disappears, and the first return spring 505 and the second return spring 508 begin to rebound. The rebound force of the first return spring 505 drives the drive shaft 503 and the pressure block 502 to slide upward, and the rebound force of the second return spring 508 drives the two support frames 507 to move closer to each other. The two support frames 507 drive the two lower chamfered blades 4 to slide into the telescopic groove until all components return to their initial positions.

[0029] The indexing assembly includes a force-bearing shaft 602, a limiting block 603, a T-shaped frame 604, a positioning shaft 605, a bearing shaft 607, a ratchet 609, a toothed ring 610, a paddle 611, an arc spring 612, and a rack 613.

[0030] The base 506 is a U-shaped plate structure extending along the direction of the expansion groove, with the U-shaped opening of the base 506 facing the corresponding support frame 507. Corresponding isosceles trapezoidal grooves 601 are provided on the top and bottom plates of the base 506. Each isosceles trapezoidal groove 601 includes a straight section in the middle and inclined sections at both ends. The straight section is parallel to the sliding direction of the support frame 507, and the ends of the two inclined sections away from the straight section are inclined towards the support frame 507.

[0031] A vertical force-bearing shaft 602 is slidably inserted into two isosceles trapezoidal grooves 601. Two limiting blocks 603 are fixedly installed on the force-bearing shaft 602, and the two limiting blocks 603 slide in contact with the inner top surface and inner bottom surface of the base 506, respectively, thereby ensuring the stability of the force-bearing shaft 602 when sliding inside the isosceles trapezoidal grooves 601. A T-shaped frame 604 is fixedly installed in the middle of the force-bearing shaft 602, and the T-shaped frame 604 contacts the support frame 507. A positioning shaft 605 is fixedly installed on the T-shaped frame 604, and the axis of the positioning shaft 605 is perpendicular to the sliding direction of the support frame 507. A limiting hole 606 is provided on the support frame 507, and the positioning shaft 605 is slidably inserted into the limiting hole 606 of the support frame 507.

[0032] The lower chamfering blade 4 is located on the side of the support frame 507 away from the base 506. The lower chamfering blade 4 is a vertically arranged square plate structure, with one of its pointed corners facing the opening of the telescopic groove. Cutting edges are provided at all four edges of the lower chamfering blade 4. A support shaft 607 is fixedly installed at the center of the lower chamfering blade 4. The support shaft 607 is rotatably inserted into the support frame 507, and its axis is perpendicular to the sliding direction of the support frame 507. Four positioning holes 608 are provided on the lower chamfering blade 4, arranged in a circular array around the axis of the support shaft 607. A positioning shaft 605 is slidably inserted into one of the positioning holes 608 of the lower chamfering blade 4.

[0033] When the positioning shaft 605 is inserted into the positioning hole 608 on the lower chamfering blade 4, the lower chamfering blade 4 is fixed relative to the support frame 507, and one cutting edge on the lower chamfering blade 4 is at the working angle. When the positioning shaft 605 is pulled out from the positioning hole 608 on the lower chamfering blade 4, the lower chamfering blade 4 can rotate on the support frame 507. By rotating the lower chamfering blade 4 by 90°, the next positioning hole 608 can be aligned with the positioning shaft 605. After the positioning shaft 605 is inserted into the corresponding positioning hole 608, the lower chamfering blade 4 is fixed back to the support frame 507, and the other cutting edge on the lower chamfering blade 4 is at the working angle.

[0034] A ratchet 609 is fixedly mounted on the bearing shaft 607. The ratchet 609 is located on the side of the bearing frame 507 away from the lower chamfering blade 4. A toothed ring 610 is sleeved on the outside of the ratchet 609, and the toothed ring 610 is rotatably mounted on the end face of the bearing frame 507 away from the lower chamfering blade 4. A paddle 611 is rotatably mounted on the inner side of the toothed ring 610. The paddle 611 engages with the ratchet teeth on the outside of the ratchet 609. An arc-shaped spring 612 is provided between the paddle 611 and the inner side of the toothed ring 610. Through the interaction of the paddle 611, the ratchet 609, and the arc-shaped spring 612, the bearing shaft 607 can only rotate in one direction. A ring of teeth is fixedly mounted on the outer side of the toothed ring 610. A rack 613 is fixedly installed on the top plate of the base 506. The rack 613 extends along the sliding direction of the support frame 507. When the toothed ring 610 slides with the support frame 507 to below the rack 613, a ring of teeth on the outer surface of the toothed ring 610 meshes with the rack 613.

[0035] A vertical settling trough 614 is provided on the top surface of the opening at both ends of the expansion joint. The width of the lower opening of the settling trough 614 is smaller than the width of its inner cavity. A vertical baffle 615 is slidably inserted into the settling trough 614. An anti-detachment block is fixedly provided on the upper end of the baffle 615. The width of the anti-detachment block is larger than the width of the lower opening of the settling trough 614, thus ensuring that the baffle 615 will not detach from the settling trough 614. When the baffle 615 is not subjected to external force, under its own weight, the lower end of the baffle 615 extends to the outside of the lower opening of the settling trough 614 and blocks the upper half of the expansion joint opening. The anti-detachment block at the upper end of the baffle 615 contacts the bottom surface of the inner cavity of the settling trough 614.

[0036] The working principle of this invention is as follows: Before positioning, clamp the tool holder 1 and fix the tool as a whole on the CNC drilling and milling equipment. The equipment drives the tool holder 1 to feed the tool head 2 downward. The upper chamfering insert 3 on the upper part of the tool head 2 first contacts the upper edge of the workpiece hole and rotates synchronously with the tool to complete the chamfering of the upper hole of the workpiece. During this stage, the lower chamfering insert 4 is in a locked and retracted state and does not contact the workpiece.

[0037] After the upper chamfer is completed, the water outlet function of the equipment is activated to inject liquid into the injection tank 501, maintaining a certain hydraulic pressure inside the injection tank 501. Under the action of hydraulic pressure, the pressure block 502 slides downward inside the sliding groove, thereby driving the drive shaft 503 and the lower pressure plates 504 on both sides of the lower end of the drive shaft 503 to slide downward, compressing the first return spring 505. The first contact slope on the two lower pressure plates 504 presses against the second contact slope on the same side of the support frame 507, causing the two support frames 507 to move away from each other along the base 506, and compressing the second return spring 508. During the process of the two support frames 507 moving away from each other, the two lower chamfering blades 4 are also moved away from each other through the support shaft 607, causing the lower chamfering blades 4 to move towards the opening of the telescopic groove.

[0038] As the two support frames 507 move away from each other, the support frame 507 drives the T-shaped frame 604 to slide synchronously through the positioning shaft 605, and the T-shaped frame 604 drives the force-bearing shaft 602 to slide synchronously.

[0039] First, the force-bearing shaft 602 slides inside the inclined section of the isosceles trapezoidal groove 601 on the side away from the opening of the telescopic groove. The force-bearing shaft 602 slides from the end of the inclined section away from the straight section towards the end closer to the straight section. Under the squeezing force of the inclined section of the isosceles trapezoidal groove 601, the force-bearing shaft 602 moves towards the opening of the telescopic groove while gradually moving away from the support frame 507. The force-bearing shaft 602 drives the T-shaped frame 604 and the positioning shaft 605 to move synchronously, so that the positioning shaft 605 gradually disengages from the positioning hole 608 of the lower chamfering blade 4. When the force-bearing shaft 602 slides into the straight section of the isosceles trapezoidal groove 601, the force-bearing shaft 602 no longer moves away from the support frame 507. At this time, the positioning shaft 605 also completely disengages from the positioning hole 608 of the lower chamfering blade 4. The relative locking state between the lower chamfering blade 4 and the support frame 507 is released, and the lower chamfering blade 4 can rotate relative to the support frame 507. At this time, the positioning shaft 605 is still inserted into the limiting hole 606 of the support frame 507.

[0040] Next, the force-bearing shaft 602 slides inside the straight section of the isosceles trapezoidal groove 601. At this time, the force-bearing shaft 602 is no longer far from the support frame 507, and the force-bearing shaft 602, T-shaped frame 604, and positioning shaft 605 slide synchronously with the support frame 507. During this process, the outer ring of teeth of the toothed ring 610 gradually meshes with the rack 613. Under the action of the rack 613, the toothed ring 610 begins to rotate. At the same time, the toothed ring 610 drives the ratchet 609 to rotate synchronously through the paddle 611. The ratchet 609 drives the support shaft 607 to rotate synchronously, and the support shaft 607 drives the lower chamfering blade 4 to rotate synchronously. After the gear ring 610 has completely passed the rack 613, the gear ring 610 stops rotating, and the ratchet 609, the bearing shaft 607, and the lower chamfering blade 4 also stop rotating. At this time, the lower chamfering blade 4 has precisely rotated 90°, and the other cutting edge of the lower chamfering blade 4 is at the working angle. The other positioning hole 608 on the lower chamfering blade 4 corresponds to the positioning shaft 605.

[0041] Finally, the force-bearing shaft 602 slides inside the inclined section of the isosceles trapezoidal groove 601 near the opening of the telescopic groove. The force-bearing shaft 602 slides from the end of the inclined section near the straight section to the end away from the straight section. Under the squeezing force of the inclined section of the isosceles trapezoidal groove 601, the force-bearing shaft 602 moves towards the opening of the telescopic groove and gradually approaches the support frame 507. The force-bearing shaft 602 drives the T-shaped frame 604 and the positioning shaft 605 to move synchronously, so that the positioning shaft 605 gradually inserts into the positioning hole 608 of the lower chamfering blade 4 at this time. When the force-bearing shaft 602 slides to the end of the inclined section away from the straight section, the positioning shaft 605 is fully inserted into the positioning hole 608 of the lower chamfering blade 4. At this time, the lower chamfering blade 4 and the support frame 507 are locked again, and the lower chamfering blade 4 extends out of the opening of the telescopic groove. Since the lower chamfering blade 4 and the support frame 507 have been locked again, the lower chamfering blade 4 will not rotate unexpectedly during operation, ensuring that the lower chamfering blade 4 remains stable during subsequent operations.

[0042] As the lower chamfering blade 4 extends outward from the opening of the telescopic groove, it presses against the lower end of the scraper plate 615, forcing the scraper plate 615 to rise upward along the settling groove 614, thus avoiding the extension path of the lower chamfering blade 4. The equipment drives the tool to move upward, and the rotating lower chamfering blade 4 completes the reverse chamfering process on the lower edge of the workpiece hole. The scraper plate 615 always adheres to the lower chamfering blade 4, blocking the metal wire generated during cutting outside the tool and preventing the metal wire from intruding into the internal structure.

[0043] After the chamfering is completed, the center water outlet function of the equipment is turned off, and the injection of liquid into the injection tank 501 is stopped. The hydraulic pressure applied inside the injection tank 501 disappears, and the first return spring 505 and the second return spring 508 begin to rebound. The rebound force of the first return spring 505 drives the drive shaft 503 and the pressure block 502 to slide upward, and the rebound force of the second return spring 508 drives the two support frames 507 to move closer to each other. The two support frames 507 drive the two lower chamfering blades 4 to slide into the telescopic groove through the support shaft 607. During the process of the two support frames 507 moving closer to each other, the support frames 507 drive the T-shaped frame 604 to slide synchronously through the positioning shaft 605, and the T-shaped frame 604 drives the force-bearing shaft 602 to slide synchronously.

[0044] First, the force-bearing shaft 602 slides inside the inclined section of the isosceles trapezoidal groove 601 near the opening of the telescopic groove, causing the positioning shaft 605 to disengage again from the positioning hole 608 of the lower chamfering blade 4. Next, the force-bearing shaft 602 slides inside the straight section of the isosceles trapezoidal groove 601, causing the gear ring 610 to move in the opposite direction and engage with the rack 613 again, rotating the gear ring 610 in the opposite direction. The gear ring 610 then rotates the lever 611 in the opposite direction. During this rotation, the lever 611 is squeezed by the ratchet 609, overcoming the elastic force of the arc spring 612 and contracting inward, thus preventing the ratchet 609 from rotating in the opposite direction and ensuring that the angle of the lower chamfering blade 4 does not change. Finally, the force-bearing shaft 602 slides inside the inclined section of the isosceles trapezoidal groove 601 away from the opening of the telescopic groove, causing the positioning shaft 605 to re-insert into the positioning hole 608 of the lower chamfering blade 4, and the lower chamfering blade 4 and the support frame 507 are re-locked.

[0045] After the lower chamfering blade 4 retracts and resets, the scraper 615 falls back down along the settling groove 614 to cover the opening of the telescopic groove again, while scraping off the metal shavings remaining on the surface of the lower chamfering blade 4 to prevent metal wires from entering the tool. All components are reset along the original movement path, and the tool can be lifted normally, realizing the process of drilling and chamfering on both sides in one clamping.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A combination tool for drilling and milling positive and negative chamfering, characterized in that: The tool includes a handle (1), a blade head (2) mounted at the lower end of the handle (1), two symmetrical upper chamfering blades (3) mounted at the upper end of the blade head (2), a telescopic groove provided at the lower end of the blade head (2), and a lower chamfering blade (4) slidably mounted at each end of the telescopic groove. The two lower chamfering blades (4) are connected to the blade head (2) through a telescopic assembly. The telescopic assembly includes a support frame (507), and a support frame (507) slidably mounted at each end of the telescopic groove. The telescopic assembly drives the two support frames (507) to move. 7) The two lower chamfering blades (4) are rotated on the two support frames (507) respectively, either far apart or close to each other. An indexing component is provided between the corresponding lower chamfering blades (4) and the support frame (507). When the support frame (507) drives the lower chamfering blades (4) to slide to the outside of the expansion groove, the indexing component drives the lower chamfering blades (4) to rotate. When the support frame (507) drives the lower chamfering blades (4) to slide to the inside of the expansion groove, the indexing component drives the lower chamfering blades (4) to fix their angle.

2. The drilling and milling combination tool for positive and negative chamfering according to claim 1, characterized in that: The telescopic assembly also includes a pressure block (502), a drive shaft (503), and a lower pressure plate (504); an injection groove (501) is provided on the upper inner side of the knife handle (1), and a sliding groove is provided on the middle inner side of the knife handle (1). The lower end of the injection groove (501) is connected to the sliding groove. The pressure block (502) is slidably arranged inside the sliding groove. The drive shaft (503) is fixedly arranged on the lower end of the pressure block (502). The lower end of the drive shaft (503) extends into the telescopic groove. A lower pressure plate (504) is fixedly arranged on both sides of the lower end of the drive shaft (503). A first contact slope is provided on the end of the two lower pressure plates (504) away from the drive shaft (503). The lower end of the first contact slope is inclined towards the side close to the axis of the drive shaft (503).

3. A drilling and milling combination tool for positive and negative chamfering according to claim 2, characterized in that: The telescopic assembly also includes a base (506); a base (506) is fixedly installed at both ends inside the telescopic groove, and two support frames (507) are slidably engaged on the two bases (506); the two support frames (507) are respectively installed on both sides of the lower end of the drive shaft (503), and a second contact slope is provided at one end of the two support frames (507) near the drive shaft (503), and the first contact slope on the two lower pressure plates (504) slides in contact with the second contact slope on the support frame (507) on the same side.

4. A drilling and milling combination tool for positive and negative chamfering according to claim 3, characterized in that: The telescopic assembly also includes a first return spring (505) and a second return spring (508); a first return spring (505) is provided at the lower end of the drive shaft (503), and the lower end of the first return spring (505) is connected to the bottom surface inside the telescopic groove; a second return spring (508) is provided between the two support frames (507) and the inner walls at both ends of the telescopic groove.

5. A drilling and milling combination tool for positive and negative chamfering according to claim 3, characterized in that: The base (506) has corresponding isosceles trapezoidal grooves (601) on its top plate and bottom plate. The isosceles trapezoidal grooves (601) include a straight section in the middle and inclined sections at both ends. The straight section is parallel to the sliding direction of the support frame (507), and the ends of the two inclined sections away from the straight section are inclined toward the support frame (507).

6. A drilling and milling combination tool for positive and negative chamfering according to claim 5, characterized in that: The indexing assembly includes a force-bearing shaft (602), a limiting block (603), a T-shaped frame (604), and a positioning shaft (605). The same force-bearing shaft (602) is slidably inserted into two isosceles trapezoidal grooves (601). Two limiting blocks (603) are fixedly installed on the force-bearing shaft (602). The two limiting blocks (603) are slidably in contact with the inner top surface and the inner bottom surface of the base (506), respectively. A T-shaped frame (604) is fixedly installed in the middle of the force-bearing shaft (602). A positioning shaft (605) is fixedly installed on the T-shaped frame (604). A limiting hole (606) is provided on the support frame (507). The positioning shaft (605) is slidably inserted into the limiting hole (606) of the support frame (507).

7. A drilling and milling combination tool for positive and negative chamfering according to claim 6, characterized in that: The indexing assembly also includes a bearing shaft (607); the lower chamfering blade (4) is located on the side of the bearing frame (507) away from the base (506), the lower chamfering blade (4) is a square plate structure, and a cutting edge is provided at each of the four edges of the lower chamfering blade (4); a bearing shaft (607) is fixedly provided at the center of the lower chamfering blade (4), the bearing shaft (607) is rotatably inserted into the inside of the bearing frame (507), and four positioning holes (608) are provided on the lower chamfering blade (4), and a positioning shaft (605) is slidably inserted into one of the positioning holes (608) of the lower chamfering blade (4).

8. A drilling and milling combination tool for positive and negative chamfering according to claim 7, characterized in that: The indexing assembly also includes a ratchet (609), a toothed ring (610), a paddle (611), an arc spring (612), and a rack (613). A ratchet (609) is fixedly mounted on the bearing shaft (607), and a toothed ring (610) is sleeved on the outside of the ratchet (609). The toothed ring (610) is rotatably mounted on the bearing frame (507). A paddle (611) is rotatably mounted on the inner side of the toothed ring (610). The paddle (611) is engaged with the ratchet teeth on the outside of the ratchet (609). An arc spring (612) is provided between the paddle (611) and the inner side of the toothed ring (610). A rack (613) is fixedly mounted on the top plate of the base (506). When the toothed ring (610) slides under the rack (613) along with the bearing frame (507), the toothed ring (610) and the rack (613) mesh.

9. A drilling and milling combination tool for positive and negative chamfering according to claim 1, characterized in that: A vertical settling trough (614) is provided on the top surface of the openings at both ends of the expansion groove, and a scraper (615) is slidably inserted inside the settling trough (614).

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