Diameter-adjustable automatic reverse countersink

Abstract

The diameter-adjustable automatic reverse countersink comprises a main cutter bar, a main cutter handle and a reverse countersink cutter bar, the upper end of the main cutter bar is fixedly connected with a machine tool spindle, the lower end of the main cutter bar is fixedly provided with a rotating shaft, and the rotating shaft and the main cutter bar are eccentrically arranged; the main knife handle is integrally and rotatably arranged on the outer side of the rotating shaft in a sleeving mode and can vertically slide on the outer side of the rotating shaft, knife handle teeth are fixedly arranged on the inner side of the main knife handle, and a reset spring is arranged between the upper ends of the knife handle teeth and the main knife rod. The cutter handle teeth fall into tooth grooves formed by the rotating shaft teeth under the action of the reset spring to be meshed with each other. The reverse countersink cutter rod is transversely and fixedly arranged on the outer side of the main cutter handle and fixedly provided with a countersink. The countersink has the beneficial effects that the eccentric connection between the main cutter rod and the main cutter handle is utilized, so that when the countersink on the main cutter handle rotates, as the rotating axis of the main cutter rod is not collinear with the rotating axis of the main cutter handle, the machining diameter is flexibly adjusted.

Description

Technical Field

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

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

[0003] The existing countersinking tools on the market can only process corresponding hole diameters. If different hole diameters need to be processed, the tool must be replaced before processing can continue. This frequent tool change operation consumes a lot of time in the actual processing process, greatly reducing work efficiency. In addition, because the countersinking tool is expensive, the use of multiple tools also significantly increases the production cost of the enterprise.

[0004] Patent CN221516370U provides a quick disassembly countersinking tool, which is provided with an assembly end and a matching groove and a locking groove on the countersinking tool head. When installing, the assembly end is matched with the locking groove to complete the fixation, and when disassembling, the assembly end is matched with the matching groove to achieve separation. However, it still needs to disassemble the tool when processing different hole diameters, which will also lead to a decrease in efficiency and lack of processing applicability. 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] In order to solve the processing problem of frequent tool changes during countersinking, and thus improve processing adaptability and processing efficiency, the present invention provides an automatic countersinking tool with adjustable diameter, comprising a main tool bar, a main tool handle and a countersinking tool bar; The main tool bar has an upper end fixedly connected to the machine tool spindle and a lower end fixedly provided with a rotating shaft, and the rotating shaft is eccentrically arranged with the main tool bar; The main tool handle is rotatably sleeved on the outside of the rotating shaft as a whole and can slide up and down on the outside of the rotating shaft. Tool handle teeth are fixedly arranged on the inside of the main tool handle. A reset spring is arranged between the upper end of the tool handle teeth and the main tool rod. A plurality of rotating shaft teeth are evenly and fixedly arranged on the outside of the rotating shaft. Under the action of the reset spring, the tool handle teeth fall into the tooth grooves formed by the rotating shaft teeth and mesh with each other. The counter countersinking bar is laterally fixedly arranged on the outside of the main tool holder, and the counter countersinking bar is used to fix the countersinking tool.

[0006] As a preferred solution, a button is provided at the lower end of the main shank, the button sleeve is arranged outside the rotating shaft and can slide up and down outside the rotating shaft, and a plurality of button teeth are evenly and fixedly provided inside the button; The button teeth and the shaft teeth are arranged alternately, and the upper ends of the button teeth and the shaft teeth are both inclined surfaces with the left side being higher than the right side, and when the button is in the lowest position, the left vertex height of the shaft tooth is lower than the right vertex height of the button tooth; when the button is in the highest position, the right vertex height of the shaft tooth is higher than the left vertex height of the button tooth, and the inclination direction and inclination angle of the tooth ends of the shaft teeth, button teeth and handle teeth are the same, and the inclination angle is greater than the friction angle φ of the material to prevent self-locking.

[0007] As a preferred solution, the machining diameter of the countersinking cutter is ; 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.

[0008] As a preferred embodiment, the button includes an upper combining part and a lower pressing part, the button teeth are fixedly arranged on the inner side of the combining part, an annular anti-falling protrusion is arranged on the lower end of the rotating shaft, the diameter of the combining part is smaller than the diameter of the anti-falling protrusion and is arranged on the upper end of the anti-falling protrusion, and the diameter of the pressing part is larger than the diameter of the anti-falling protrusion and is sleeved on the outer side of the anti-falling protrusion.

[0009] As a preferred solution, the rotating shaft is cylindrical and is provided with a locking bolt to fix the main tool rod.

[0010] As a preferred solution, the rotation angle generated by pressing the main tool handle each time is no greater than 45 degrees.

[0011] As a preferred solution, the length of the eccentricity is not less than the difference between the length of the countersinking arbor and the radius of the main arbor.

[0012] The beneficial effects of the present invention are: 1. The present invention realizes flexible adjustment of the countersinking diameter by utilizing the eccentric connection between the main tool bar and the main tool handle, so that when the countersink on the main tool handle is rotated, the rotation axis of the main tool bar is not colinear with the rotation axis of the main tool handle, thereby realizing precise control of different processing diameters.

[0013] 2. The present invention can realize a mechanism for quickly switching the countersinking cutter processing diameter by pressing a button. This design greatly simplifies the operating process, is more adaptable to automated processing requirements, and can quickly adjust the countersinking cutter diameter, thereby improving work efficiency and processing efficiency, reducing manual intervention, and reducing operational complexity. It also reduces errors caused by improper human operation, thereby ensuring the stability and reliability of the processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein: Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a schematic diagram of the internal structure of the present invention when the button is at the bottom.

[0016] Figure 3 It is a schematic diagram of the internal structure of the present invention when the button is at the top.

[0017] Figure 4 It is a cross-sectional view of the main tool rod axis position of the present invention.

[0018] Figure 5 It is a schematic diagram of the counter countersinking cutter of the present invention when it moves to different positions.

[0019] The reference numerals in the accompanying drawings are: 1. Main tool bar; 2. Reset spring; 3. Main tool handle; 4. Button; 41. Combination part; 42. Pressing part; 5. Rotating shaft; 51. Anti-dropping protrusion; 6. Button teeth; 7. Tool handle teeth; 8. Countersinking tool bar; 9. Countersinking tool; 10. Locking bolt; 11. Tightening bolt; 12. Countersinking tool bolt; 13. Rotating shaft teeth. DETAILED DESCRIPTION

[0020] To illustrate the features of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Example: See also Figures 1 to 5 The embodiment of the present invention provides an automatic countersinking tool with adjustable diameter, comprising a main tool bar 1, a main tool handle 3 and a countersinking tool bar 8, wherein the diameter D of the main tool bar 1 is 15.6 mm, the diameter D of the main tool handle 3 is d =4mm, length of countersinking tool bar 8 l =10.3mm.

[0022] The main tool bar 1 has an upper end fixedly connected to the machine tool spindle, and a rotating shaft 5 is fixedly arranged at the lower end. The rotating shaft 5 is cylindrical and is fixedly connected to the main tool bar 1 with a locking bolt 10. The rotating shaft 5 is eccentrically arranged with the main tool bar 1, and the eccentricity is =4.5mm; the eccentric setting realizes the flexible adjustment of the processing diameter, and utilizes the eccentric connection between the rotating shaft 5 and the main tool bar 1, so that when the countersinking cutter on the main tool handle 3 is rotated, since the rotation axis of the countersinking cutter bar 8 is not colinear with the rotation axis of the main tool bar 1, it is possible to achieve precise control of different processing diameters.

[0023] The main tool handle 3 is rotatably sleeved on the outside of the rotating shaft 5 as a whole and can slide up and down on the outside of the rotating shaft 5. Eight tool handle teeth 7 are fixedly arranged on the inside of the main tool handle 3. The tool handle teeth 7 are fixedly connected to the main tool handle 3 through a tightening bolt 11. A reset spring 2 is arranged between the upper end of the tool handle teeth 7 and the main tool rod 1. Eight rotating shaft teeth 13 are evenly arranged on the outside of the rotating shaft 5. The rotating shaft teeth 13 are directly integrally formed with the rotating shaft 5 during processing. Under the action of the reset spring 2, the tool handle teeth 7 fall into the tooth grooves formed by the rotating shaft teeth 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 on the outside of the rotating shaft 5 and can be moved on the outside of the rotating shaft 5. Sliding up and down, 8 button teeth 6 are evenly arranged on the inner side of the button 4, and the button teeth 6 are fixedly connected to the button 4 by a tightening bolt 11; the button teeth 6 and the shaft teeth 13 are arranged alternately, and the upper ends of the button teeth 6 and the shaft teeth 13 are both inclined surfaces 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 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 shaft teeth 13 is higher than the left vertex height of the button teeth 6, and the inclination direction and inclination angle of the tooth ends of the shaft teeth 13, button teeth 6 and 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.

[0024] During processing, the button 4 can be pressed through the contact between the tool and the workpiece, and the button tooth 6 pushes the shank tooth 7 to move upward and squeeze the reset spring 2. When the right vertex of the shank tooth 7 is higher than the left vertex of the shaft tooth 13, the shaft tooth 13 no longer blocks the shank tooth 7, and the entire main shank 3 drives the shank tooth 7 to slide above the shaft tooth 13 under the action of the reset spring 2; then the button 4 is pressed to end, and the button 4 drives the button tooth 6 to slide to the bottom, so that the height of the left vertex of the button tooth 6 is lower than the height of the right vertex of the shaft tooth 13, and the shank tooth 7 continues to slide to above the next button tooth 6, completing a position rotation switch of the main shank 3. Because 8 shaft teeth 13 and 8 button teeth 6 are evenly distributed in a circle in the present application, a single switching rotation rotates one-eighth of the circumference, that is, 45 degrees. The corresponding countersink processing diameter of multiple rotations is shown in the following table.

[0025] The mechanism of quickly switching the countersinking cutter processing diameter is achieved by pressing button 4. This design greatly simplifies the operation process, is more adaptable to the needs of automated processing, and can quickly adjust the diameter of the countersinking cutter, thereby improving work efficiency and processing efficiency, reducing human intervention, reducing operational complexity, and also reducing errors caused by improper human operation, thereby ensuring the stability and reliability of the processing process.

[0026] The counter countersinking bar 8 is laterally fixedly arranged outside the main tool holder 3, and the counter countersinking bar 8 is fixedly provided with a counter countersinking tool 9, which is fixedly connected to the counter countersinking bar 8 by a counter countersinking tool bolt 12. The machining diameter of the counter countersinking tool 9 can be calculated by a calculation formula, ; 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.

[0027] In order to facilitate pressing the button 4 in the present embodiment, the button 4 is configured to include an upper combination part 41 and a lower pressing part 42, the button tooth 6 is fixedly arranged on the inner side of the combination part 41, and an annular anti-falling protrusion 51 is arranged on the lower end of the rotating shaft 5. The diameter of the combination part 41 is smaller than the diameter of the anti-falling protrusion 51 and is arranged on the upper end of the anti-falling protrusion 51, the diameter of the pressing part 42 is larger than the diameter of the anti-falling protrusion 51 and is sleeved on the outer side of the anti-falling protrusion 51. Through the bite of the shape, the button 4 is clamped between the anti-falling protrusion 51 and the main shank 3 to prevent the button 4 from falling and enable the button 4 to rotate around the rotating shaft 5.

[0028] The above embodiments and drawings are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. The present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that any changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention. Other related technical structures not fully disclosed in the present invention are prior art in the art.

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 tool 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 tool handle tooth (7) is fixedly arranged on the inside of the main tool handle (3); a reset spring (2) is arranged between the upper end of the tool handle tooth (7) and the main tool rod (1); a plurality of rotating shaft teeth (13) are evenly distributed and fixedly arranged on the outside of the rotating shaft (5); the tool handle teeth (7) fall into the tooth grooves formed by the rotating shaft teeth under the action of the reset spring (2) and mesh with each other; 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: A button (4) is arranged at the lower end of the main tool 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, and 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.

3. 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.

4. The automatic countersinking cutter with adjustable diameter according to claim 2, 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).

5. 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).

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

7. The automatic countersinking cutter with adjustable diameter according to claim 1, 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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