Rotary table for drilling a center hole in a bar

Abstract

The application discloses a self-rotating table for drilling a center hole of a bar, which comprises a main body, a plurality of rotating shaft work stations arranged on the main body and rotating shafts arranged on the rotating shaft work stations, wherein the main body comprises a panel, a bottom plate and side plates, the rotating shaft work stations vertically penetrate the panel and the bottom plate of the main body, the bar is vertically fixed in the rotating shafts, positioning sleeves are arranged between the inner walls of the rotating shafts and the bar, the positioning sleeves are replaceable positioning sleeves, and the bar rotates along with the rotation of the rotating shafts and the positioning sleeves when the bar is drilled. By synchronously rotating the bar with the rotating shafts and the positioning sleeves during machining, the error caused by the deflection of a drill bit is actively offset, the machining precision is effectively improved, and meanwhile, the replaceable positioning sleeves can adapt to the machining of bars with different sizes, and the machining adaptability is improved.

Description

Technical Field

[0001] This application relates to the field of machining equipment technology, and in particular to a rotary table for drilling center holes in bar stock. Background Technology

[0002] In conventional bar machining, especially for deep hole machining, insufficient machining accuracy is a common problem. Because traditional machining methods rely solely on the rotation of the drill bit to generate cutting force while the bar stock remains stationary, this unidirectional force distribution can easily lead to significant deviations in the concentricity and perpendicularity of the machined center hole.

[0003] This technical defect stems primarily from two key factors. First, drill bits with a large length-to-diameter ratio inherently have poor rigidity, making them prone to wobble during drilling. Second, the fixed workpiece machining method means the drilling process relies entirely on the machine's centering accuracy, making it impossible to actively correct drill bit wobble. This passive machining method is particularly problematic when machining high-precision center holes, as it struggles to guarantee the hole's coaxiality and perpendicularity, severely impacting the quality and efficiency of subsequent machining processes.

[0004] In addition, traditional processing equipment lacks flexibility in bar clamping and positioning, making it difficult to adapt to the processing needs of bars of different specifications, which further limits the improvement of processing accuracy. Utility Model Content

[0005] The purpose of this application is to provide a rotary table for drilling center holes in bar stock, so as to solve the technical problems of low efficiency and quality in bar stock drilling in related technologies.

[0006] This application provides a rotary table for drilling center holes in bar stock, comprising: a main body, a plurality of rotating shaft stations disposed on the main body, and a rotating shaft disposed on the rotating shaft stations. The main body includes a front panel, a bottom plate, and a side plate. The rotating shaft stations vertically penetrate the front panel and the bottom plate of the main body. The bar stock is vertically fixed inside the rotating shaft. A positioning sleeve is disposed between the inner wall of the rotating shaft and the bar stock. The positioning sleeve is replaceable. When drilling the hole in the bar stock, the bar stock rotates along with the rotation of the rotating shaft and the positioning sleeve.

[0007] Optionally, the positioning sleeve is inserted from one side of the base plate and fixed inside the rotating shaft.

[0008] Optionally, the rotary table for drilling the center hole of the bar stock further includes a collet and a locking nut, and the collet is disposed at one end of the rotating shaft, and the locking nut secures the bar stock by locking the collet.

[0009] Optionally, the rotary table for drilling the center hole of the bar stock further includes a driving gear and a driven gear, wherein the driven gear is fixed relative to the rotating shaft, the driving gear drives the driven gear to move, and the driven gear drives the rotating shaft to rotate.

[0010] Optionally, the rotary table for drilling the center hole of the bar stock further includes a speed-regulating brushless motor and a reducer. The speed-regulating brushless motor is connected to the reducer and the drive gear from bottom to top. The speed-regulating brushless motor drives the reducer to work so as to drive the drive gear.

[0011] Optionally, the rotary table for drilling the center hole of the bar stock further includes a station bearing and a gear bearing, wherein the station bearing is installed at the upper and lower ends of the rotating shaft, and the gear bearing is installed at the end of the drive gear near the panel.

[0012] Optionally, the rotary table for drilling the center hole of the bar stock further includes a bearing housing, wherein the station bearing mounted on the lower end of the rotating shaft is placed on the bearing housing.

[0013] Optionally, the bearing housing is adjustablely mounted on the base plate.

[0014] Optionally, the rotating table for drilling the center hole of the bar stock further includes a positioning sleeve fixing screw, which fixes the positioning sleeve to the rotating shaft.

[0015] Optionally, the rotating table for drilling the center hole of the bar stock further includes a sealing ring, which is installed on the panel and disposed at the connection between the panel and the rotating shaft.

[0016] This application provides a rotary table for drilling center holes in bar stock. The rotary table includes a main body, several rotating shaft stations on the main body, and rotating shafts on the rotating shaft stations. The main body includes a front panel, a bottom plate, and side plates. The rotating shaft stations vertically penetrate the front panel and bottom plate of the main body. The bar stock is vertically fixed inside the rotating shaft. A positioning sleeve is provided between the inner wall of the rotating shaft and the bar stock. The positioning sleeve is replaceable. When drilling the bar stock, the bar stock rotates along with the rotating shaft and the positioning sleeve. By making the bar stock rotate synchronously with the rotating shaft and the positioning sleeve during processing, the error caused by drill bit wobble is actively offset, effectively improving processing accuracy, especially the concentricity and perpendicularity of the center hole. Furthermore, the replaceable positioning sleeve can meet the processing needs of bar stock of different sizes, improving the versatility of the processing. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the structure of the self-rotating table for drilling center holes in bar stock provided in an embodiment of this application;

[0018] Among them, panel 1, base plate 2, side plate 3, rotating shaft 4, positioning sleeve 5, collet 6, locking nut 7, driving gear 8, driven gear 9, speed-regulating brushless motor 10, reducer 11, station bearing 12, gear bearing 13, bearing seat 14, positioning sleeve fixing screw 15, and sealing strip 16. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be understood that the steps described in the method embodiments of this disclosure may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this disclosure is not limited in this respect.

[0021] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.

[0022] In conventional bar stock drilling for center holes, the drill bit rotates while the bar stock remains stationary, causing the drill bit with a large length-to-diameter ratio to wobble due to insufficient rigidity. This passive machining method makes it difficult to control the concentricity and perpendicularity of the center hole, especially when machining deep holes. The machine's centering accuracy cannot effectively correct the drill bit's offset tendency, resulting in poor machining quality stability.

[0023] To address the technical problems existing in related technologies, this application provides a rotary table for drilling center holes in bar stock. Please refer to [link to relevant documentation]. Figure 1 , Figure 1This is a schematic diagram of a rotating table for drilling center holes in bar stock provided in an embodiment of this application. The rotating table for drilling center holes in bar stock includes: a main body, a plurality of rotating shaft stations arranged on the main body, and a rotating shaft 4 arranged on the rotating shaft stations. The main body includes a panel 1, a bottom plate 2, and a side plate 3. The rotating shaft stations vertically penetrate the panel 1 and the bottom plate 2 of the main body. The bar stock is vertically fixed inside the rotating shaft 4. A positioning sleeve 5 is provided between the inner wall of the rotating shaft 4 and the bar stock. The positioning sleeve 5 is a replaceable positioning sleeve. When drilling holes in the bar stock, the bar stock rotates with the rotation of the rotating shaft 4 and the positioning sleeve 5.

[0024] The main body refers to the frame structure that supports the rotating shaft station, consisting of panel 1, base plate 2, and side plates 3, as detailed below. Figure 1 As shown, the main body can be formed by steel plate welding or casting. The panel 1 and the bottom plate 2 are connected by the side plate 3 to form a stable support.

[0025] In one embodiment, such as Figure 1 As shown, the rotary shaft station is a through-hole structure that runs through the upper and lower surfaces of the main body, used to place and fix the rotary shaft station, and the rotary shaft 4 will be placed on the rotary shaft station. When drilling the bar stock, the bar stock is placed inside the rotary shaft. At the same time, a positioning sleeve 5 can be placed between the rotary shaft and the bar stock according to the size of the bar stock, so as to realize the drilling of bar stock of different sizes.

[0026] For the rotary table used to drill the center hole of the entire bar stock, its main structure forms a rigid support platform. The rotating shaft position runs vertically through the main body to ensure the coaxial accuracy of the rotating shaft 4. After the bar stock is loaded into the rotating shaft, the radial clearance is eliminated by the replaceable positioning sleeve 5 to achieve precise centering. During the machining process, the rotating shaft 4 drives the positioning sleeve 5 and the bar stock to rotate synchronously, forming a compound motion state relative to the drill bit.

[0027] Through the above technical solution, this application achieves active rotation control in the bar stock processing process, effectively improving the concentricity and perpendicularity of deep hole machining. The replaceable feature of the positioning sleeve expands the processing size range of the equipment, the distribution design of the rotary axis stations improves batch processing efficiency, and the overall structure enhances the equipment's versatility while ensuring processing accuracy.

[0028] Furthermore, referring to Figure 1 The positioning sleeve 5 is inserted from one side of the base plate 2 and fixed inside the rotating shaft 4.

[0029] In one embodiment, the positioning sleeve 5 is disposed between the rotating shaft 4 and the bar stock to enable drilling of different bar stock. The replaceable positioning sleeve 4 can be made of detachable metal or composite material sleeve, and its inner diameter and thickness can be designed according to actual needs to meet the needs of bar stock of different specifications and sizes. Specifically, different sizes of positioning sleeves are used to adapt to bar stock of different diameters.

[0030] For example, the positioning sleeve 5 is pushed axially upward into the interior of the rotating shaft 4 through the opening on one side of the base plate 2. When fixing the positioning sleeve 5, it can be fixed by means of interference fit or threaded connection. When changing the positioning sleeve 5 to meet the processing of bar stock of different sizes, the operator does not need to disassemble the rotating shaft 4 or the panel 1. He only needs to take out the old positioning sleeve 5 directly from under the base plate 2 and install the new positioning sleeve 5 to complete the adjustment.

[0031] Through the above technical solution, this application realizes the quick replacement and precise positioning of the positioning sleeve, avoids coaxiality deviation caused by multiple disassembly and assembly, and reduces the complexity of equipment maintenance. It is especially suitable for deep hole machining scenarios that require frequent switching of bar specifications.

[0032] Furthermore, referring to Figure 1 The rotating table for drilling the center hole of the bar stock also includes a collet 6 and a locking nut 7. The collet 6 is located at one end of the rotating shaft 4, and the locking nut 7 fixes the bar stock by locking the collet 6.

[0033] In one embodiment, the collet 6 and the locking nut 7 are used to fix the bar stock, such as... Figure 1 As shown, with the bar stock placed inside the rotating shaft 4, the collet 6 is positioned between the bar stock and the rotating shaft 4. The bar stock is then secured by locking the collet 6 with a locking nut 7. The locking nut 7 can be a threaded ring-shaped fastener, such as a hexagonal nut, which clamps the bar stock by threading.

[0034] In practical applications, after the bar stock is inserted into the rotating shaft 4, the collet 6 is fitted onto the opening of the rotating shaft 4 near the machining end. The locking nut 7 is screwed into the outer wall of the rotating shaft 4 and presses the collet 6 downwards. As the locking nut 7 tightens, the segmented structure of the collet 6 contracts towards the center under axial pressure, thus evenly wrapping and clamping the outer surface of the bar stock. During drilling, the rotating shaft 4 drives the collet 6 and the bar stock to rotate synchronously. The preload of the locking nut 7 prevents the collet 6 from loosening due to vibration or centrifugal force, ensuring that the bar stock and the rotating shaft 4 rotate coaxially.

[0035] Through the above technical solution, this application solves the problem of drilling deviation caused by insecure clamping of bar stock, ensuring that the bar stock remains coaxial with the rotation axis during rotation, thereby improving the concentricity and perpendicularity of the drilling.

[0036] Furthermore, referring to Figure 1 The rotary table for drilling the center hole of bar stock also includes a driving gear 8 and a driven gear 9. The driven gear 9 is fixed relative to the rotating shaft 4. The driving gear 8 drives the driven gear 9 to move, and the driven gear 9 drives the rotating shaft 4 to rotate.

[0037] In one embodiment, the rotary table for drilling the center hole of the bar stock further includes a driving gear 8 and a driven gear 9. The driving gear 8 obtains rotational power through the provided driving device to drive the driven gear 9 to rotate, so as to realize the drilling process of the fixed bar stock.

[0038] Furthermore, referring to Figure 1 The rotary table for drilling the center hole of bar stock also includes a speed-regulating brushless motor 10 and a reducer 11. The speed-regulating brushless motor 10 is connected to the reducer 11 and the drive gear 8 from bottom to top. The speed-regulating brushless motor 10 drives the reducer 11 to work so as to drive the drive gear 8.

[0039] In one embodiment, the speed-regulating brushless motor 10 controls the speed and drives the reducer 11 to run. The reducer 11 drives the drive gear 8 to rotate, thereby driving the associated driven gear 9 to run.

[0040] For example, the speed-regulating brushless motor 10 can be fixed to the base plate by flange mounting, such as... Figure 1 As shown, the output shaft of the speed-regulating brushless motor 10 is coaxially connected to the input end of the reducer 11 via a coupling. The output end of the reducer 11 is fixed to the center hole of the drive gear 8 via a keyway. When the speed-regulating brushless motor 10 is powered on, its rotor generates a rotating magnetic field that drives the output shaft to rotate. The power is reduced in speed and increased in torque by the reducer 11 and then transmitted to the drive gear 8. The drive gear 8 transmits the rotational motion to the rotating shaft 4 through meshing with the driven gear 9, thereby driving the bar stock to rotate synchronously.

[0041] Furthermore, referring to Figure 1 The rotary table for drilling the center hole of the bar stock also includes a station bearing 12 and a gear bearing 13. The station bearing 12 is installed at the upper and lower ends of the rotating shaft 4, and the gear bearing 13 is installed at the end of the drive gear 8 near the panel 1.

[0042] In one embodiment, station bearings 12 are respectively arranged at both ends of the rotating shaft 4, and gear bearings 13 are arranged at the end of the drive gear 8 near the panel 1, forming a coaxial fixed shape with the output shaft of the reducer 11. When the speed-regulating brushless motor 10 drives the drive gear 8 to rotate, the gear bearing 13 bears the axial load from the gear meshing, while the station bearings 12 bear the radial load generated by the rotation of the bar stock on the rotating shaft.

[0043] Furthermore, referring to Figure 1 The rotary table for drilling the center hole of bar stock also includes a bearing seat 14, wherein the station bearing 12, which is installed at the lower end of the rotating shaft 4, is placed on the bearing seat 14.

[0044] In one embodiment, the bearing housing 14 refers to the support structure that carries the workstation bearing 12. It is mounted on the base plate 2 to support the workstation bearing 12 mounted on the lower end of the rotating shaft 4.

[0045] Furthermore, the bearing housing 12 is adjustablely mounted on the base plate 2.

[0046] In one embodiment, the bearing housing 12 is adjustablely mounted on the base plate 2. By fine-tuning the bearing housing 12, the perpendicularity of the rotating shaft 4 to the worktable surface of the base plate 2 can be adjusted, thereby improving the drilling process.

[0047] Furthermore, referring to Figure 1 The rotating table for drilling the center hole of the bar stock also includes a positioning sleeve fixing screw 15, which fixes the positioning sleeve 5 to the rotating shaft 4.

[0048] In one embodiment, the positioning sleeve fixing screw 15 is a fastener used to connect the positioning sleeve 5 and the rotating shaft 4. During the bar stock clamping process, after the positioning sleeve 5 is placed in the inner hole of the rotating shaft 4, the positioning sleeve fixing screw 15 is tightened so that the end of the screw abuts against the annular groove on the outer wall of the positioning sleeve 5. When the rotating shaft 4 rotates with the drive mechanism, the radial pressure generated by the positioning sleeve fixing screw 15 can prevent the positioning sleeve 5 from undergoing circumferential displacement or axial movement within the rotating shaft 4. When processing bars of different diameters, after replacing the matching positioning sleeve 5, the positioning sleeve fixing screw 15 can be retightened to complete the fixing of the positioning sleeve 5.

[0049] Furthermore, referring to Figure 1 The rotating table for drilling the center hole of the bar stock also includes a sealing ring 16, which is installed on the panel 1 and located at the connection between the panel 1 and the rotating shaft 4.

[0050] In one embodiment, the sealing ring 16 is an annular seal used to close the gap between the rotating shaft 4 and the panel 1. Specifically, it can be made of rubber, silicone or polyurethane material. By forming an elastic sealing layer on the contact surface between the rotating shaft 4 and the panel 1, it prevents coolant or metal debris from entering the interior of the rotating shaft during processing.

[0051] After installing a sealing ring at the connection between panel 1 and rotating shaft 4, the axial vibration generated by rotating shaft 4 during high-speed rotation is buffered by the elastic deformation of the sealing ring. At the same time, the sealing ring 16 forms a wrap-around seal on the edge of the through hole of panel 1. When the bar stock rotates with the rotating shaft, external splashed coolant or metal debris generated during processing is blocked by the sealing ring, preventing it from entering the interior of rotating shaft 4 through the gap between panel 1 and rotating shaft 4, thereby preventing debris accumulation that could cause rotating shaft jamming or wear of the positioning sleeve.

[0052] Furthermore, referring to Figure 1 On the side of the rotating shaft 4 near the base plate 3, the hole formed on the base plate 3 can be used to remove waste generated from the processing of bar stock, including slag removal and drainage.

[0053] In summary, this application discloses a rotary table for drilling center holes in bar stock, comprising a main body, several rotary axis stations disposed on the main body, and a rotary axis disposed on the rotary axis stations. The main body includes a front panel, a bottom plate, and side plates. The rotary axis stations vertically penetrate the front panel and bottom plate of the main body. The bar stock is vertically fixed inside the rotary axis. A positioning sleeve is disposed between the inner wall of the rotary axis and the bar stock. The positioning sleeve is replaceable. During drilling, the bar stock rotates along with the rotary axis and the positioning sleeve. By making the bar stock rotate synchronously with the rotary axis and the positioning sleeve during processing, the error caused by drill bit runout is actively offset, effectively improving processing accuracy, especially the concentricity and perpendicularity of the center hole. Furthermore, the replaceable positioning sleeve can meet the processing requirements of bar stock of different sizes, improving the versatility of the processing.

[0054] The foregoing has provided a detailed description of a rotary table for drilling center holes in bar stock, as provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application. Moreover, those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A rotary table for drilling center holes in bar stock, characterized in that, include: The system comprises a main body, several rotating shaft stations on the main body, and rotating shafts on the rotating shaft stations. The main body includes a front panel, a bottom plate, and side plates. The rotating shaft stations vertically penetrate the front panel and the bottom plate of the main body. A bar stock is vertically fixed inside the rotating shaft. A positioning sleeve is provided between the inner wall of the rotating shaft and the bar stock. The positioning sleeve is replaceable. When drilling holes in the bar stock, the bar stock rotates with the rotation of the rotating shaft and the positioning sleeve.

2. The rotary table for drilling center holes in bar stock as described in claim 1, characterized in that, The positioning sleeve is inserted from one side of the base plate and fixed inside the rotating shaft.

3. The rotary table for drilling center holes in bar stock as described in claim 1, characterized in that, The rotating table for drilling the center hole of the bar stock also includes a collet and a locking nut, and the collet is located at one end of the rotating shaft. The locking nut secures the bar stock by locking the collet.

4. The rotary table for drilling center holes in bar stock as described in claim 1, characterized in that, The rotary table for drilling the center hole of the bar stock also includes a driving gear and a driven gear. The driven gear is fixed relative to the rotating shaft. The driving gear drives the driven gear to move, and the driven gear drives the rotating shaft to rotate.

5. The rotary table for drilling center holes in bar stock as described in claim 4, characterized in that, The rotating table for drilling the center hole of the bar stock also includes a speed-regulating brushless motor and a reducer. The speed-regulating brushless motor is connected to the reducer and the drive gear from bottom to top. The speed-regulating brushless motor drives the reducer to work, thereby driving the drive gear.

6. The rotary table for drilling center holes in bar stock as described in claim 4, characterized in that, The rotary table for drilling the center hole of the bar stock also includes a station bearing and a gear bearing, with the station bearing installed at the upper and lower ends of the rotating shaft, and the gear bearing installed at the end of the drive gear near the panel.

7. The rotary table for drilling center holes in bar stock as described in claim 6, characterized in that, The rotary table for drilling the center hole of the bar stock also includes a bearing housing, wherein... The station bearing, which is installed at the lower end of the rotating shaft, is placed on the bearing housing.

8. The rotary table for drilling center holes in bar stock as described in claim 7, characterized in that, The bearing housing is adjustablely mounted on the base plate.

9. The rotary table for drilling center holes in bar stock as described in claim 7, characterized in that, The rotating table for drilling the center hole of the bar stock also includes a positioning sleeve fixing screw, which fixes the positioning sleeve to the rotating shaft.

10. The rotary table for drilling center holes in bar stock as described in claim 1, characterized in that, The rotating table for drilling the center hole of the bar stock also includes a sealing ring, which is installed on the panel and located at the connection between the panel and the rotating shaft.

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