Burr-free machining tool for stepped hole machining

Abstract

The utility model relates to the technical field of stepped hole machining tools, and discloses a burr-free machining tool for stepped hole machining, which comprises a fixed shaft and a deburring assembly, the bottom of the fixed shaft is fixedly connected with a base, the bottom of the base is fixedly connected with an upper hole drill bit, and the bottom of the upper hole drill bit is fixedly connected with a lower hole drill bit. The upper hole drill bit and the lower hole drill bit are used for machining stepped holes in a workpiece, in the machining process, compressed air is continuously conveyed to the air supply pipe through the hollow rotary sleeve and the air inlet pipe via the hollow pipeline, and the compressed air enters the air chamber and pushes the piston plates on the two sides to overcome the tension of the reset tension spring to move outwards; the friction plate is driven to radially extend out and press towards a right-angle transition area of a machined stepped hole, the friction plate polishes and removes residual material curled edges in the area under the action of rotation of a cutter, drilling and deburring are synchronously completed, and the problem that part assembly is affected due to the fact that burrs are prone to being generated at the step connecting corner is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of step hole machining tools, and in particular to a burr-free step hole machining tool. Background Technology

[0002] A stepped hole drill bit is an industrial drilling tool, also known as a step drill or pagoda drill. It is mainly used for drilling. Its core feature is that it can replace multiple drill bits, can process holes of different diameters as needed, and can complete the machining of large holes in one go without changing drill bits or drilling positioning holes.

[0003] Existing stepped hole machining tools typically consist of a tool holder and a composite cutting head fixed to the front end of the tool holder. The composite cutting head integrates annular cutting edge groups with different outer diameters, corresponding to the large and small diameter portions of the stepped hole. During machining, the tool rotates along the axis and feeds, so that the cutting edges of different levels cut the workpiece material in sequence, thereby forming stepped inner holes with different diameters in one operation.

[0004] However, when using this type of tool for machining, annular or dot-shaped burrs are easily generated in the right-angle transition area or diameter change area of ​​the stepped hole. This is mainly because the cutting edge trajectory of the tool changes abruptly at the junction of the steps. After the cutting edge at the front end, which is used to machine the small hole, completes its cutting, it leaves a small burr of unremoved material at the junction corner. The large-diameter cutting edge that follows has an axial main cutting direction, and the side edge has limited effect on removing this radial residual material. The material undergoes plastic deformation under the pressure of the cutting force instead of being effectively cut off, thus forming burrs that are difficult to remove. These burrs adhere to the hole wall, which will affect the smooth assembly of subsequent shaft parts and may even cause scratches on the mating surfaces. In order to remove these burrs, an additional deburring process is often required, which reduces the machining efficiency and product consistency. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] In view of the problems existing in the existing burr-free machining tools for stepped holes, this utility model is proposed.

[0007] Therefore, the problem that this utility model aims to solve is that existing stepped hole machining tools do not have a deburring function. During the drilling process, tiny material curls are easily left at the corners where the steps meet, forming burrs that are difficult to remove, which affects the smooth assembly of parts.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a burr-free machining tool for stepped holes, comprising a fixed shaft and a deburring assembly. A base is fixedly connected to the bottom of the fixed shaft, an upper drill bit is fixedly connected to the bottom of the base, and a lower drill bit is fixedly connected to the bottom of the upper drill bit. The deburring assembly includes an air chamber, the surface of which is fixedly connected to the inner wall of the upper drill bit. Both sides of the air chamber extend to the outer side of the upper drill bit. An air supply pipe is connected to the top of the air chamber. A return spring is provided in the inner cavity of the air chamber. Piston plates are fixedly connected to both sides of the return spring. A friction plate is fixedly connected to the side of the piston plate away from the return spring by an adhesive. The upper drill bit, the base, and the fixed shaft are all connected by a hollow pipe. A rotary air supply mechanism is provided on the surface of the fixed shaft.

[0009] As a preferred embodiment of the step hole machining burr-free machining tool of this utility model, the rotary air supply mechanism includes a hollow rotary sleeve. The inner wall of the hollow rotary sleeve is slidably connected to the surface of the fixed shaft. An annular notch is provided on the inner wall of the hollow rotary sleeve. An air inlet pipe is connected to the surface of the fixed shaft. The hollow rotary sleeve can be used in conjunction with the fixed shaft, so that the fixed shaft can rotate inside the hollow rotary sleeve. The annular notch facilitates the installation of the air inlet pipe. The air inlet pipe can rotate inside the annular notch and simultaneously deliver compressed air to the inside of the hollow pipe.

[0010] As a preferred embodiment of the step hole machining burr-free machining tool of the present invention, the top and bottom of the hollow rotating sleeve are fixedly connected with limit rings, and the surface of the fixed shaft is provided with an annular groove that cooperates with the limit rings. The limit rings and the annular groove can improve the stability of the hollow rotating sleeve and prevent the hollow rotating sleeve from shaking during the rotation of the fixed shaft.

[0011] As a preferred embodiment of the step hole machining burr-free machining tool of the present invention, the surface of the fixed shaft is movably connected to a limit baffle, and the surface of the air inlet pipe is slidably connected to the inner wall of the annular notch. The limit baffle can limit the hollow rotating sleeve to prevent it from jumping up and down on the surface of the fixed shaft. The surface of the air inlet pipe is slidably connected to the inner wall of the annular notch so that the air inlet pipes will not collide with each other when rotating with the fixed shaft, thereby increasing its operational stability.

[0012] As a preferred embodiment of the step hole machining burr-free machining tool of the present invention, a mounting base is fixedly connected to the surface of the hollow rotating sleeve. An air supply hose is provided on the side of the mounting base away from the hollow rotating sleeve. The front end of the air supply hose passes through the mounting base and communicates with the hollow rotating sleeve. The mounting base can prevent the air supply hose from contacting the upper hole drill bit, and at the same time facilitates the input of compressed air into the hollow rotating sleeve.

[0013] As a preferred embodiment of the step hole machining burr-free tool of this utility model, the inner cavity of the hollow rotating sleeve is provided with a fastening and anti-loosening mechanism. The fastening and anti-loosening mechanism includes a piston ring, the surface of which is slidably connected to the inner wall of the hollow rotating sleeve. A compression ring is provided at the top of the surface of the fixed shaft. A top plate is fixedly connected between the compression ring and the piston ring. A compression spring is fixedly connected to the bottom of the compression ring. The piston ring can move inside the hollow rotating sleeve, and its height can be controlled by compressed air. The compression ring can cooperate with the top plate and the piston ring to adjust its height. During use, the equipment compresses and fixes the fixed shaft, and at the same time, the compression ring compresses the equipment upward, increasing the stability of the fixed shaft after fixation and preventing it from shaking during use.

[0014] As a preferred embodiment of the step hole machining burr-free machining tool of this utility model, the top of the hollow rotating sleeve is provided with a movable opening for use with the top plate, and the top of the extrusion ring is fixedly connected with an anti-slip pad. The movable opening facilitates the vertical adjustment of the top plate, and the anti-slip pad can protect the output end of the equipment and prevent the extrusion ring from damaging it.

[0015] As a preferred embodiment of the step hole machining tool of the present invention, the piston plate is provided with an exhaust microhole on the side away from the reset spring. The exhaust microhole can discharge some air, so that when the friction plate grinds the burrs, the falling waste chips are blown out of the step hole.

[0016] As a preferred embodiment of the step hole machining burr-free machining tool of this utility model, the top of the air supply pipe is connected to the hollow pipe, and the surface of the fixed shaft is provided with anti-slip texture, wherein the anti-slip texture can increase the stability of the fixed shaft installation.

[0017] As a preferred embodiment of the step hole machining burr-free machining tool of the present invention, the surface of the piston plate is slidably connected to the inner wall of the air chamber, and the upper hole drill bit has mounting holes on both sides for use with the air chamber. The mounting holes facilitate the installation and fixation of the air chamber, so that it can stably drive the friction plate to move.

[0018] The beneficial effects of this utility model are as follows: Stepped holes are machined on the workpiece using upper and lower drill bits. During the machining process, compressed air is continuously delivered to the air supply pipe through a hollow rotating sleeve and air inlet pipe. The compressed air enters the air chamber and pushes the piston plates on both sides to move outward against the tension of the return spring, thereby causing the friction plate to extend radially and press against the right-angle transition area of ​​the machined stepped hole. Under the rotation of the cutting tool, the friction plate grinds and removes the residual material edges in this area, achieving simultaneous drilling and deburring. This effectively solves the problem of burrs easily generated at the corners of the stepped joints, affecting the assembly of parts, and avoids the need for a subsequent deburring process. The exhaust micro-holes on the piston plate can blow away the fine debris generated during grinding from the hole wall, keeping the hole clean. At the same time, the piston ring of the anti-loosening mechanism, under the action of air pressure, pushes the extrusion ring upward through the top plate to tighten the output end of the equipment, making the installation of the fixed shaft more stable and preventing vibration caused by the contact between the friction plate and the workpiece during machining, thereby further improving the deburring effect and machining quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0020] Figure 1 Structural diagram of a tool for burr-free machining of stepped holes;

[0021] Figure 2 Side view of a tool for machining burr-free stepped holes;

[0022] Figure 3 A cross-sectional view of the hollow rotating sleeve of a tool for machining burr-free stepped holes;

[0023] Figure 4 Exploded view of the fastening and anti-loosening mechanism for burr-free machining tools for stepped holes;

[0024] Figure 5 Schematic diagram of a hollow rotating sleeve for a burr-free machining tool for stepped holes;

[0025] Figure 6 A cross-sectional view of the air chamber of a tool for machining burr-free stepped holes.

[0026] Reference numerals: 1. Fixed shaft; 2. Base; 3. Upper drill bit; 4. Lower drill bit; 5. Deburring assembly; 51. Air chamber; 52. Air supply pipe; 53. Return spring; 54. Piston plate; 55. Friction plate; 56. Rotary air supply mechanism; 561. Hollow rotating sleeve; 562. Annular notch; 563. Air inlet pipe; 564. Limiting baffle; 565. Mounting seat; 566. Air supply hose; 6. Fastening and anti-loosening mechanism; 61. Piston ring; 62. Compression ring; 63. Top plate; 64. Compression spring. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0030] Example 1

[0031] Reference Figures 1-6 This is the first embodiment of the present invention. This embodiment provides a step hole machining tool without burrs. The step hole machining tool without burrs includes a fixed shaft 1 and a deburring assembly 5. The bottom of the fixed shaft 1 is fixedly connected to a base 2. The bottom of the base 2 is fixedly connected to an upper hole drill bit 3. The bottom of the upper hole drill bit 3 is fixedly connected to a lower hole drill bit 4. The deburring assembly 5 includes an air chamber 51. The surface of the air chamber 51 is fixedly connected to the inner wall of the upper hole drill bit 3. Both sides of the air chamber 51 extend to the outer side of the upper hole drill bit 3. The top of the air chamber 51 is connected to an air supply pipe 52. The inner cavity of the air chamber 51 is provided with a return spring 53. Both sides of the return spring 53 are fixedly connected to piston plates 54. The side of the piston plate 54 away from the return spring 53 is fixedly connected to a friction plate 55 by adhesive. The upper hole drill bit 3, the base 2 and the fixed shaft 1 are all connected by a hollow pipe. The surface of the fixed shaft 1 is provided with a rotary air supply mechanism 56.

[0032] The rotary gas delivery mechanism 56 includes a hollow rotary sleeve 561. The inner wall of the hollow rotary sleeve 561 is slidably connected to the surface of the fixed shaft 1. An annular notch 562 is provided on the inner wall of the hollow rotary sleeve 561. An air inlet pipe 563 is connected to the surface of the fixed shaft 1. Limiting rings are fixedly connected to the top and bottom of the inner cavity of the hollow rotary sleeve 561. An annular groove that cooperates with the limiting rings is provided on the surface of the fixed shaft 1. A limiting baffle 564 is movably connected to the surface of the fixed shaft 1. The surface of the air inlet pipe 563 is slidably connected to the inner wall of the annular notch 562. A mounting base 565 is fixedly connected to the surface of the hollow rotary sleeve 561. An air delivery hose 566 is provided on the side of the mounting base 565 away from the hollow rotary sleeve 561. The front end of the air delivery hose 566 passes through the mounting base 565 and communicates with the hollow rotary sleeve 561.

[0033] Specifically, the base 2 facilitates the installation and fixation of the fixed shaft 1 and the upper drill bit 3. The fixed shaft 1 facilitates the installation of the upper drill bit 3 and the lower drill bit 4 at the output end of the equipment. The upper drill bit 3 and the lower drill bit 4 work together to process stepped holes on the surface of the workpiece. The air supply pipe 52 can deliver compressed air to the inside of the air chamber 51. The air chamber 51 can work with the piston plate 54 to control the movement of the two friction plates 55, so that they can grind the step junction area of ​​the stepped hole and remove burrs. The position of the friction plates 55 is controlled by air pressure. The grinding operation is performed immediately after the hole is opened to prevent burrs inside the stepped hole from affecting the assembly of the parts. The hollow pipe facilitates the delivery of compressed air. The rotating air supply mechanism 56 can deliver compressed air so that the compressed air can be delivered into the rotating upper drill bit 3.

[0034] Specifically, the hollow rotating sleeve 561 can be used in conjunction with the fixed shaft 1, allowing the fixed shaft 1 to rotate inside the hollow rotating sleeve 561. The annular notch 562 facilitates the installation of the air inlet pipe 563, which can rotate inside the annular notch 562, simultaneously delivering compressed air into the hollow pipe. The limiting ring and annular groove improve the stability of the hollow rotating sleeve 561, preventing it from shaking during the rotation of the fixed shaft 1. The limiting baffle 564 limits the hollow rotating sleeve 561, preventing it from jumping up and down on the surface of the fixed shaft 1. The surface of the air inlet pipe 563 slides against the inner wall of the annular notch 562, preventing the air inlet pipes 563 from colliding with each other when rotating with the fixed shaft 1, thus increasing its operational stability. The mounting base 565 improves the stability of the air delivery hose 566 installation, prevents the air delivery hose 566 from contacting the upper drill bit 3, and facilitates the input of compressed air into the hollow rotating sleeve 561.

[0035] Example 2

[0036] Reference Figures 1-4This is the second embodiment of the present invention. Based on the previous embodiment, the inner cavity of the hollow rotating sleeve 561 is provided with a fastening and anti-loosening mechanism 6. The fastening and anti-loosening mechanism 6 includes a piston ring 61. The surface of the piston ring 61 is slidably connected to the inner wall of the hollow rotating sleeve 561. A compression ring 62 is provided at the top of the surface of the fixed shaft 1. A top plate 63 is fixedly connected between the compression ring 62 and the piston ring 61. A compression spring 64 is fixedly connected to the bottom of the compression ring 62. The top of the hollow rotating sleeve 561 has an movable opening that cooperates with the top plate 63. An anti-slip pad is fixedly connected to the top of the compression ring 62.

[0037] Specifically, the piston ring 61 can move inside the hollow rotating sleeve 561, and its height can be controlled by compressed air. The compression ring 62 can cooperate with the top plate 63 and the piston ring 61 to adjust the height. During use, the equipment compresses and fixes the fixed shaft 1, while the compression ring 62 compresses the equipment upward to increase the stability of the fixed shaft 1 after it is fixed and prevent it from shaking during use. The movable opening facilitates the vertical adjustment of the top plate 63, and the anti-slip rubber pad can protect the output end of the equipment and prevent the compression ring 62 from damaging it.

[0038] Example 3

[0039] Reference Figure 4 , Figure 5 and Figure 6 This is the third embodiment of the present invention. This embodiment is based on the first two embodiments. The piston plate 54 has an exhaust microhole on the side away from the reset spring 53. The top of the air supply pipe 52 is connected to the hollow pipe. The surface of the fixed shaft 1 is provided with anti-slip texture. The surface of the piston plate 54 is slidably connected to the inner wall of the air chamber 51. The upper hole drill bit 3 has mounting holes on both sides that cooperate with the air chamber 51.

[0040] Specifically, the exhaust micro-holes can expel some air, so that when the friction plate 55 grinds the burrs, the falling debris is blown out of the stepped hole. The anti-slip texture can increase the stability of the fixed shaft 1. The mounting hole can facilitate the installation and fixation of the air chamber 51, so that it can stably drive the friction plate 55 to move.

[0041] During use, when the tool starts working, the fixed shaft 1 rotates, driving the upper hole drill bit 3 and the lower hole drill bit 4 of the base 2 to cut the workpiece, forming a stepped hole. At the same time, compressed air enters the hollow rotating sleeve 561 connected to the mounting base 565 through the air supply hose 566. The annular notch 562 in the hollow rotating sleeve 561 allows the air inlet pipe 563 to deliver air during rotation. The compressed air enters the hollow pipe of the fixed shaft 1 through the air inlet pipe 563, and then reaches the air chamber 51 through the air supply pipe 52. In the air chamber 51, the compressed air pushes the piston plate 54 to move outward against the tension of the return spring 53. 4. The friction plate 55 extends radially and contacts the transition area of ​​the stepped hole. During rotation, the friction plate 55 grinds burrs and removes material curling. The exhaust micro-holes on the piston plate 54 discharge some air, blow away waste, and keep the hole clean. At the same time, compressed air acts on the piston ring 61, which moves in the hollow rotating sleeve 561 and pushes the extrusion ring 62 upward through the top plate 63. The extrusion ring 62 compresses the extrusion spring 64 and presses against the output end of the equipment, thereby stabilizing the fixed shaft 1 and preventing vibration during deburring. In the whole process, deburring and drilling are completed simultaneously, improving processing efficiency and quality.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A burr-free machining tool for machining stepped holes, characterized in that: It includes a fixed shaft (1) and a deburring assembly (5). The bottom of the fixed shaft (1) is fixedly connected to a base (2), the bottom of the base (2) is fixedly connected to an upper hole drill bit (3), and the bottom of the upper hole drill bit (3) is fixedly connected to a lower hole drill bit (4). The deburring assembly (5) includes an air chamber (51), the surface of which is fixedly connected to the inner wall of the upper hole drill bit (3), both sides of which extend to the outer side of the upper hole drill bit (3), and the top of which is connected to an air supply pipe (52). A reset spring (53) is provided in the inner cavity of the air chamber (51), and piston plates (54) are fixedly connected to both sides of the reset spring (53). A friction plate (55) is fixedly connected to the side of the piston plate (54) away from the reset spring (53) by an adhesive. The upper hole drill bit (3), the base (2) and the fixed shaft (1) are all connected by a hollow pipe, and the surface of the fixed shaft (1) is provided with a rotating gas supply mechanism (56).

2. The burr-free machining tool for machining stepped holes according to claim 1, characterized in that: The rotary gas delivery mechanism (56) includes a hollow rotary sleeve (561), the inner wall of the hollow rotary sleeve (561) is slidably connected to the surface of the fixed shaft (1), the inner wall of the hollow rotary sleeve (561) is provided with an annular notch (562), and the surface of the fixed shaft (1) is connected to an air inlet pipe (563).

3. The burr-free machining tool for machining stepped holes according to claim 2, characterized in that: Limiting rings are fixedly connected to the top and bottom of the inner cavity of the hollow rotating sleeve (561), and an annular groove that cooperates with the limiting rings is opened on the surface of the fixed shaft (1).

4. The burr-free machining tool for machining stepped holes according to Claim 2, characterized in that: The surface of the fixed shaft (1) is movably connected to a limit baffle (564), and the surface of the air intake pipe (563) is slidably connected to the inner wall of the annular notch (562).

5. The burr-free machining tool for machining stepped holes according to Claim 2, characterized in that: A mounting base (565) is fixedly connected to the surface of the hollow rotating sleeve (561). An air supply hose (566) is provided on the side of the mounting base (565) away from the hollow rotating sleeve (561). The front end of the air supply hose (566) passes through the mounting base (565) and communicates with the hollow rotating sleeve (561).

6. The burr-free machining tool for stepped holes as described in claim 2, characterized in that: The hollow rotating sleeve (561) is provided with a fastening and anti-loosening mechanism (6). The fastening and anti-loosening mechanism (6) includes a piston ring (61). The surface of the piston ring (61) is slidably connected to the inner wall of the hollow rotating sleeve (561). A compression ring (62) is provided on the top of the surface of the fixed shaft (1). A top plate (63) is fixedly connected between the compression ring (62) and the piston ring (61). A compression spring (64) is fixedly connected to the bottom of the compression ring (62).

7. The burr-free machining tool for machining stepped holes according to claim 6, characterized in that: The top of the hollow rotating sleeve (561) is provided with an movable opening that cooperates with the top plate (63), and the top of the compression ring (62) is fixedly connected with an anti-slip pad.

8. The burr-free machining tool for machining stepped holes according to Claim 1, wherein: The piston plate (54) has an exhaust micro-hole on the side away from the reset spring (53).

9. The burr-free machining tool for machining stepped holes according to Claim 1, wherein: The top of the air supply pipe (52) is connected to the hollow pipe, and the surface of the fixed shaft (1) is provided with anti-slip texture.

10. The burr-free machining tool for machining stepped holes according to Claim 1, wherein: The surface of the piston plate (54) is slidably connected to the inner wall of the air chamber (51), and the upper hole drill bit (3) has mounting holes on both sides that cooperate with the air chamber (51).

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