An automatic counterboring tool with adjustable diameter

Abstract

The present invention provides an automatic counterboring tool with an adjustable diameter, which includes a main tool shank, a main tool handle, and a counterboring tool shank. The upper end of the main tool shank is fixedly connected to the machine tool spindle, and the lower end is fixedly provided with a rotating shaft, which is eccentrically arranged with respect to the main tool shank. The main tool handle is integrally rotatably sleeved outside the rotating shaft and can slide up and down outside the rotating shaft. A tool handle tooth is fixedly arranged inside the main tool handle. A return spring is arranged between the upper end of the tool handle tooth and the main tool shank. A plurality of rotating shaft teeth are evenly and fixedly arranged outside the rotating shaft. The tool handle tooth falls into the tooth groove formed by the rotating shaft teeth under the action of the return spring and engages with each other. The counterboring tool shank is horizontally and fixedly arranged outside the main tool handle, and a counterboring tool is fixedly arranged on the counterboring tool shank. The beneficial effect of the present invention lies in that by using the eccentric connection between the main tool shank and the main tool handle, when the counterboring tool on the main tool handle rotates, since the rotation axis of the main tool shank does not coincide with the rotation axis of the main tool handle, flexible adjustment of the machining diameter is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal cutting tools, and particularly relates to an automatic countersinking tool with adjustable diameter. Background Art

[0002] In the machinery manufacturing industry, especially during the processing of pump and housing parts, it is often necessary to perform back countersinking operations, which are referred to as "reverse countersinking" in the process. The significance of reverse countersinking lies mainly in aspects such as the stability of mechanical assembly, the rationality of structural design, and the aesthetics of appearance. It can effectively improve the fitting accuracy of parts, reduce installation errors, protect the head of the fastener from external damage, and improve the safety of the workpiece.

[0003] The existing countersinking tools on the market can only process corresponding hole diameters. When it is necessary to process different hole diameters, it is necessary to replace the tool before continuing the processing. This frequent tool replacement operation consumes a large amount of time in the actual processing process, greatly reducing the work efficiency. And because the cost of the countersinking tool is high, using multiple tools also significantly amplifies the production cost of the enterprise.

[0004] Patent CN221516370U provides a quickly disassembled and assembled countersinking tool. By setting an assembly end and opening a mating groove and a locking groove on the countersinking tool head, the assembly end is mated with the locking groove to complete the fixation during installation, and the assembly end is made to correspond to the mating groove to achieve detachment during disassembly. However, it still requires disassembling the tool when processing different hole diameters, which also leads to a reduction in efficiency and a lack of processing adaptability. Therefore, a countersinking tool that can meet the processing requirements of different countersinking hole diameters is urgently needed in current production and processing. Summary of the Invention

[0005] To solve the processing problem of frequent tool replacement during reverse countersinking, and further improve the processing adaptability and processing efficiency, the present invention provides an automatic countersinking tool with adjustable diameter, including a main tool rod, a main tool handle, and a countersinking tool rod;

[0006] The main tool rod has its upper end fixedly connected to the machine tool spindle, and its lower end fixedly provided with a rotating shaft, and the rotating shaft is eccentrically arranged with respect to the main tool rod;

[0007] The main tool handle is integrally rotatably sleeved outside the rotating shaft and can slide up and down outside the rotating shaft. A tool handle tooth is fixedly provided inside the main tool handle. A return spring is provided between the upper end of the tool handle tooth and the main tool rod. A plurality of rotating shaft teeth are evenly and fixedly provided outside the rotating shaft. The tool handle tooth falls into the tooth groove formed by the rotating shaft teeth under the action of the return spring and engages with each other;

[0008] The countersinking tool rod is horizontally fixedly provided outside the main tool handle, and a countersinking tool is fixedly provided on the countersinking tool rod.

[0009] As a preferred solution, a button is provided at the lower end of the main tool handle. The button is sleeved outside the rotating shaft and can slide up and down outside the rotating shaft. A plurality of button teeth are uniformly and fixedly arranged on the inner side of the button;

[0010] The button teeth and the rotating shaft teeth are arranged alternately. The upper ends of the button teeth and the rotating shaft teeth are both inclined surfaces with the left side higher than the right side. When the button is in the lowest position, the height of the left vertex of the rotating shaft tooth is lower than the height of the right vertex of the button tooth; when the button is in the highest position, the height of the right vertex of the rotating shaft tooth is higher than the height of the left vertex of the button tooth. The inclination directions and inclination angles of the tooth ends of the rotating shaft teeth, the button teeth and the tool handle teeth are the same, and the inclination angle is greater than the friction angle φ of the material to prevent self-locking.

[0011] As a preferred solution, the machining diameter of the countersinking cutter ;

[0012] wherein, is the diameter of the main tool handle, is the eccentricity between the main tool shank and the main tool handle, is the rotation angle of the main tool handle, is the length of the reverse countersinking tool shank.

[0013] As a preferred solution, the button includes a combined part above and a pressing part below. The button teeth are fixedly arranged on the inner side of the combined part. An annular anti-detachment protrusion is provided at the lower end of the rotating shaft. The diameter of the combined part is smaller than the diameter of the anti-detachment protrusion and is arranged at the upper end of the anti-detachment protrusion. The diameter of the pressing part is larger than the diameter of the anti-detachment protrusion and is sleeved outside the anti-detachment protrusion.

[0014] As a preferred solution, the rotating shaft is in a cylindrical shape and is fixedly connected to the main tool shank by a locking bolt.

[0015] As a preferred solution, the rotation angle generated by each pressing of the main tool handle is not greater than 45 degrees.

[0016] As a preferred solution, the length of the eccentricity is not less than the difference between the length of the reverse countersinking tool shank and the radius of the main tool shank.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention realizes flexible adjustment of the countersinking hole diameter. By using the eccentric connection between the main tool shank and the main tool handle, when the countersinking cutter on the main tool handle rotates, since the rotation axis of the main tool shank does not coincide with the rotation axis of the main tool handle, precise control of different machining diameters can be achieved.

[0019] 2. The present invention can achieve a mechanism for quickly switching the countersinking tool's machining diameter by pressing a button. This design greatly simplifies the operation process, better adapts to the requirements of automated machining, quickly adjusts the diameter of the countersinking tool, thereby improving work efficiency and machining efficiency, reducing manual intervention, lowering operation complexity, and also reducing errors caused by improper manual operation, ensuring the stability and reliability of the machining process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the present invention more clearly understood, the following further details the present invention according to specific embodiments in conjunction with the drawings, where:

[0021] Figure 1 is a schematic structural diagram of the present invention.

[0022] Figure 2 is a schematic internal structure diagram of the present invention when the button is at the bottommost end.

[0023] Figure 3 is a schematic internal structure diagram of the present invention when the button is at the topmost end.

[0024] Figure 4 is a cross-sectional view of the present invention at the position of the main tool shank axis.

[0025] Figure 5 is a schematic diagram of the present invention's reverse countersinking tool at different positions during movement.

[0026] The reference numerals in the drawings are:

[0027] 1. Main tool shank; 2. Return spring; 3. Main tool holder; 4. Button; 41. Combined part; 42. Pressing part; 5. Rotating shaft; 51. Anti-detachment protrusion; 6. Button teeth; 7. Tool holder teeth; 8. Reverse countersinking tool shank; 9. Countersinking tool; 10. Locking bolt; 11. Tightening teeth bolt; 12. Countersinking tool bolt; 13. Rotating shaft teeth. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To illustrate the features of the present invention, the following further describes the present invention in conjunction with the drawings and embodiments.

[0029] Embodiment:

[0030] Please refer to Figures 1 to 5 , the embodiment of the present invention provides an adjustable-diameter automatic reverse countersinking tool, including a main tool shank 1, a main tool holder 3, and a reverse countersinking tool shank 8, where the diameter D of the main tool shank 1 is 15.6 mm, the diameter of the main tool holder 3 d = 4 mm, and the length of the reverse countersinking tool shank 8 l = 10.3 mm.

[0031] The main tool shank 1 has its upper end fixedly connected to the machine tool spindle and its lower end fixedly provided with a rotating shaft 5. The rotating shaft 5 is cylindrical, and a locking bolt 10 is provided to fixedly connect the main tool shank 1. The rotating shaft 5 and the main tool shank 1 are eccentrically arranged, and the eccentricity = 4.5 mm. Through this eccentric arrangement, flexible adjustment of the machining diameter is achieved. By utilizing the eccentric connection between the rotating shaft 5 and the main tool shank 1, when the countersinking cutter on the main tool handle 3 rotates, since the rotation axis of the reverse countersinking tool shank 8 does not coincide with the rotation axis of the main tool shank 1, precise control of different machining diameters can be realized.

[0032] The main tool handle 3 is integrally rotatably sleeved outside the rotating shaft 5 and can slide up and down outside the rotating shaft 5. Eight tool handle teeth 7 are fixedly arranged inside the main tool handle 3. The tool handle teeth 7 are fixedly connected to the main tool handle 3 through tight teeth bolts 11. A return spring 2 is arranged between the upper end of the tool handle teeth 7 and the main tool shank 1. Eight rotating shaft teeth 13 are evenly distributed outside the rotating shaft 5. The rotating shaft teeth 13 are integrally formed with the rotating shaft 5 directly during machining. The tool handle teeth 7 fall into the tooth grooves formed by the rotating shaft teeth under the action of the return spring 2 and engage with each other. In this embodiment, a button 4 is also arranged at the lower end of the main tool handle 3. The button 4 is sleeved outside the rotating shaft 5 and can slide up and down outside the rotating shaft 5. Eight button teeth 6 are evenly distributed inside the button 4. The button teeth 6 are fixedly connected to the button 4 through tight teeth bolts 11. The button teeth 6 and the rotating shaft teeth 13 are alternately arranged. The upper ends of the button teeth 6 and the rotating shaft teeth 13 are inclined planes with the left side higher than the right side. And when the button 4 is in the lowest position, the left vertex height of the rotating shaft teeth 13 is lower than the right vertex height of the button teeth 6. When the button 4 is in the highest position, the right vertex height of the rotating shaft teeth 13 is higher than the left vertex height of the button teeth 6. The inclination directions and inclination angles of the tooth ends of the rotating shaft teeth 13, the button teeth 6 and the tool handle teeth 7 are the same, and the inclination angle is greater than the steel friction angle of 8.5 degrees to prevent self-locking.

[0033] During machining, the button 4 can be pressed by the contact between the tool and the workpiece to be machined. The button teeth 6 push the tool handle teeth 7 to move upward and compress the return spring 2. When the right vertex of the tool handle teeth 7 is higher than the left vertex of the rotating shaft teeth 13, the rotating shaft teeth 13 no longer block the tool handle teeth 7. The entire main tool handle 3 will drive the tool handle teeth 7 to slide above the rotating shaft teeth 13 under the action of the return spring 2. Subsequently, when the pressing of the button 4 ends, the button 4 drives the button teeth 6 to slide down to the bottom, making the left vertex height of the button teeth 6 lower than the right vertex height of the rotating shaft teeth 13. The tool handle teeth 7 continue to slide above the next button teeth 6, completing a position rotation switch of the main tool handle 3. Since there are 8 rotating shaft teeth 13 and 8 button teeth 6 evenly distributed within a circle in this application, the single switch rotates one-eighth of a circle, that is, 45 degrees. The corresponding countersinking cutter machining diameters for multiple rotations are shown in the following table.

[0034]

[0035] The mechanism for quickly switching the countersinking tool's machining diameter by pressing button 4 greatly simplifies the operation process, better adapts to the requirements of automated machining, quickly adjusts the diameter of the countersinking tool, thereby improving work efficiency and machining efficiency, reducing manual intervention, lowering operation complexity, and also reducing errors caused by improper manual operation, ensuring the stability and reliability of the machining process.

[0036] The reverse countersinking tool bar 8 is horizontally and fixedly arranged outside the main tool shank 3. The reverse countersinking tool bar 8 is fixedly provided with a countersinking tool 9, and the countersinking tool 9 is fixedly connected to the reverse countersinking tool bar 8 through a countersinking tool bolt 12. The machining diameter of the countersinking tool 9 can be calculated by the following formula, ;

[0037] wherein, is the diameter of the main tool shank, is the eccentricity between the main tool bar and the main tool shank, is the rotation angle of the main tool shank, is the length of the reverse countersinking tool bar.

[0038] Specifically, in this embodiment, for the convenience of pressing button 4, the button 4 is set to include a combined part 41 above and a pressing part 42 below. The button tooth 6 is fixedly arranged inside the combined part 41. An annular anti-dropping protrusion 51 is arranged at the lower end of the rotating shaft 5. The diameter of the combined part 41 is smaller than the diameter of the anti-dropping protrusion 51 and is arranged at the upper end of the anti-dropping protrusion 51. The diameter of the pressing part 42 is larger than the diameter of the anti-dropping protrusion 51 and is sleeved outside the anti-dropping protrusion 51. Through the engagement of the shapes, the button 4 is clamped between the anti-dropping protrusion 51 and the main tool shank 3, preventing the button 4 from falling and enabling the button 4 to rotate around the rotating shaft 5.

[0039] The above embodiments and the accompanying drawings are only used to illustrate the technical solutions of the present invention and are not limitations on the present invention. The present invention has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions, or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention do not depart from the purpose of the present invention and should also fall within the protection scope of the claims of the present invention. Other related technical structures not exhaustively disclosed in the present invention are the prior art in this technical field.

Claims

1. An automatic countersinking tool with adjustable diameter, comprising a main tool bar (1), a main tool handle (3) and a countersinking tool bar (8), characterized in that: A main tool bar (1) has an upper end fixedly connected to a machine tool spindle and a lower end fixedly provided with a rotating shaft (5), the rotating shaft (5) being eccentrically arranged with respect to the main tool bar (1); The main knife handle (3) is integrally rotatably sleeved on the outside of the rotating shaft (5) and can slide up and down on the outside of the rotating shaft (5); a knife handle tooth (7) is fixedly arranged on the inside of the main knife handle (3); a reset spring (2) is arranged between the upper end of the knife handle tooth (7) and the main knife rod (1); a plurality of rotating shaft teeth (13) are evenly and fixedly arranged on the outside of the rotating shaft (5); the knife handle teeth (7) fall into the tooth grooves formed by the rotating shaft teeth under the action of the reset spring (2) and engage with each other; a button (4) is arranged on the lower end of the main knife handle (3); the button (4) is sleeved on the outside of the rotating shaft (5) and can slide up and down on the outside of the rotating shaft (5); a plurality of button teeth (6) are evenly and fixedly arranged on the inside of the button (4); The button teeth (6) and the rotating shaft teeth (13) are arranged alternately, the upper ends of the button teeth (6) and the rotating shaft teeth (13) are both inclined surfaces with the left side higher than the right side, and when the button (4) is at the lowest position, the height of the left vertex of the button teeth (6) is lower than the height of the right vertex of the rotating shaft teeth (13); when the button (4) is at the highest position, the height of the right vertex of the button teeth (6) is higher than the height of the left vertex of the rotating shaft teeth (13), and the inclination direction and inclination angle of the tooth ends of the rotating shaft teeth (13), the button teeth (6) and the shank teeth (7) are the same, and the inclination angle is greater than the friction angle φ of the material to prevent self-locking; The counter-countering bar (8) is laterally fixedly arranged outside the main tool handle (3), and the counter-countering bar (8) is fixedly arranged with the counter-countering tool (9).

2. The automatic countersinking cutter with adjustable diameter according to claim 1, characterized in that: The machining diameter of the countersinking cutter (9) ; in, is the diameter of the main tool holder, is the eccentricity between the main tool bar and the main tool handle, is the rotation angle of the main tool holder, is the length of the countersinking tool bar.

3. The automatic countersinking cutter with adjustable diameter according to claim 1, characterized in that: The button (4) comprises an upper combination portion (41) and a lower pressing portion (42); the button teeth (6) are fixedly arranged inside the combination portion (41); an annular anti-dropping protrusion (51) is arranged at the lower end of the rotating shaft (5); the diameter of the combination portion (41) is smaller than the diameter of the anti-dropping protrusion (51) and is arranged at the upper end of the anti-dropping protrusion (51); the diameter of the pressing portion (42) is larger than the diameter of the anti-dropping protrusion (51) and is sleeved on the outer side of the anti-dropping protrusion (51).

4. The automatic countersinking cutter with adjustable diameter according to claim 1, characterized in that: The rotating shaft (5) is cylindrical and is provided with a locking bolt (10) for fixedly connecting the main tool rod (1).

5. The automatic countersinking cutter with adjustable diameter according to claim 2, characterized in that: The rotation angle generated by pressing the main tool handle each time No more than 45 degrees.

6. The automatic countersinking cutter with adjustable diameter according to claim 2, characterized in that: The length of the eccentricity is not less than the difference between the length of the counter-countering arbor (8) and the radius of the main arbor (1).

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