A powered knife

Abstract

The utility model discloses a power cutter belongs to mechanical processing technical field, including fixed frame (1) and set up first shaft sleeve (2) on fixed frame (1), the second shaft sleeve (3) of slidingly being sleeved in first shaft sleeve (2) inside along the axial direction, the main shaft (4) of rotationally being sleeved in second shaft sleeve (3) inside along the circumference direction, the front end of main shaft (4) is provided with processing cutter (8), and the first drive mechanism (9) for driving main shaft (4) along the circumferential rotation of itself is set up on mounting panel (10), and mounting panel (10) is sleeved in the outside of second shaft sleeve (3), and the second drive mechanism (11) for driving second shaft sleeve (3) along the axial movement of itself is set up on fixed frame (1), and the output shaft of second drive mechanism (11) is connected with mounting panel (10), the utility model can guarantee the movement precision, movement stability of main shaft (4), and ensure the processing quality of work piece.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, specifically relating to a power cutting tool. Background Technology

[0002] As a key functional component of modern CNC machine tools such as mill-turn machining centers, the performance of power cutting tools directly determines the machine tool's ability to perform machining operations such as drilling, milling, and chamfering on workpieces.

[0003] Utility model application CN200820167370.4 discloses a drilling and tapping machine tool, including a power head mounted on the upper part of the worktable for clamping cutting tools. The power head includes a rotating sleeve parallel to the worktable and a spindle. The cylindrical rotating sleeve is fitted onto the spindle, and the power unit is connected to the rotating sleeve. A hydraulic mechanism is provided at the spindle to drive its movement. A connecting structure is provided between the spindle and the rotating sleeve to fix both circumferentially, but the spindle can move axially relative to the rotating sleeve. The connecting structure consists of a spline on the outside of the spindle and a spline groove on the inside of the rotating sleeve, or a spline groove on the outside of the spindle and a spline on the inside of the rotating sleeve. The spline and spline groove cooperate to allow the spindle to rotate with the rotating sleeve while simultaneously driving the cutting tool to move axially relative to the rotating sleeve under the action of the hydraulic mechanism, thus performing cutting machining on the workpiece.

[0004] However, in actual processing, the aforementioned drilling and tapping machine tool has the following defects: First, during the axial drive of the spindle by the hydraulic mechanism, it relies solely on the spline pair for guidance, which lacks sufficient guiding accuracy and rigidity. In other words, it lacks high-precision linear guidance for the axial movement of the spindle, failing to meet the requirements of high-precision machining. Second, when the tool is being processed, the spindle extends out of the rotating sleeve and is in a cantilever state. The spline pair cannot provide effective radial support to resist cutting forces and bending stress from the tool, which directly affects the spindle's motion accuracy and stability, thereby affecting the precise alignment of the tool axis with the workpiece, and ultimately affecting the machining quality of the workpiece. Utility Model Content

[0005] The purpose of this utility model is to overcome the technical problems of poor motion accuracy and stability of power tools on drilling machine tools in the prior art, which cannot meet the requirements of high-precision machining, and to provide a power tool with good motion accuracy and stability that can meet the requirements of high-precision machining.

[0006] To solve the above-mentioned technical problems, this utility model provides a power cutting tool, including a fixed frame and a first bushing disposed on the fixed frame, a second bushing slidably fitted inside the first bushing along the axial direction, and a main shaft rotatably fitted inside the second bushing along the circumferential direction. A first gap exists between the first bushing and the second bushing, and sealing rings are respectively disposed at both ends of the first gap, forming a lubrication cavity between the sealing rings. A second gap exists between the second bushing and the main shaft, and a bearing for supporting the rotation of the main shaft is disposed in the second gap. A machining tool is disposed at the front end of the main shaft. A first drive mechanism for driving the main shaft to rotate circumferentially is disposed on a mounting plate, and the output shaft of the first drive mechanism is connected to the rear end of the main shaft. The mounting plate is fitted outside the second bushing. A second drive mechanism for driving the second bushing to move axially is disposed on the fixed frame, and the output shaft of the second drive mechanism is connected to the mounting plate.

[0007] As a further improvement of this utility model, the first bushing is provided with an oil hole, and the inner surface of the first bushing is provided with a spiral oil groove, and the oil groove is located between the sealing rings, and the oil hole is connected to the oil groove.

[0008] As a further improvement of this utility model, the inner surface of the first bushing is provided with a mounting groove, and the sealing ring is disposed in the mounting groove.

[0009] As a further improvement of this utility model, the first bushing is provided with a first through hole and a second through hole, and the mounting plate is provided with a first mounting part and a second mounting part. The first mounting part passes through the first through hole and is connected to the first drive mechanism, and the second mounting part passes through the second through hole and is connected to the output shaft of the second drive mechanism.

[0010] As a further improvement of this utility model, the first through hole and the second through hole are both set as elongated holes, and the lengths of the first through hole and the second through hole are both greater than the axial travel of the second bushing.

[0011] As a further improvement of this utility model, a slide rail is provided at the opening of the second through hole along the driving direction of the second driving mechanism, and a slider is slidably disposed on the slide rail, the slider being connected to the second mounting part on the mounting plate.

[0012] As a further improvement of this utility model, an adjusting plate is provided on the outside of the first bushing. Several adjusting holes are provided on the four sides of the adjusting plate along the radial direction of the first bushing. An adjusting screw is threaded into each adjusting hole. The inner end of the adjusting screw is connected to the first bushing, and an adjusting handwheel is provided on the outer end of the adjusting screw.

[0013] As a further improvement of this utility model, the front end of the spindle is provided with a tool joint, and the machining tool is mounted on the spindle through the tool joint.

[0014] As a further improvement of this utility model, the above-mentioned machining tool is configured as a drill bit, a reamer, or a chamfering tool.

[0015] As a further improvement of this utility model, a first synchronous pulley is sleeved on the rear end of the main shaft, a second synchronous pulley is sleeved on the output shaft of the first drive mechanism, and a synchronous belt is provided between the first synchronous pulley and the second synchronous pulley.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model fixes the first bushing to the fixed frame, slides the second bushing axially inside the first bushing, and rotates the spindle inside the second bushing. Combined with the mounting plate on the second bushing, and the first and second drive mechanisms, it achieves synchronous rotational and linear feed motion of the spindle. Depending on the selected machining tool, it facilitates drilling, internal hole finishing, or chamfering of the workpiece. 2. In this utility model, the second bushing provides rigid support for the spindle, resisting the influence of cutting forces and bending stress from the tool on the spindle, ensuring the spindle's motion accuracy and stability, and guaranteeing precise alignment between the tool axis and the workpiece. 3. In this utility model, by setting a lubrication cavity between the first and second bushings, the lubricating oil forms a uniform oil film on the sliding surface of the second bushing, which can effectively reduce the friction and wear between the second bushing and the first bushing during axial movement. In conjunction with the slide rail and slider, the sliding fit between the second bushing and the first bushing is ensured, further guaranteeing the stability and high precision of the second bushing and the spindle in linear feed motion. 4. By setting an adjustment plate on the first bushing, the installation position of the first bushing and its entire internal power unit on the fixed frame can be finely adjusted radially with multiple degrees of freedom, thereby compensating for manufacturing errors and ensuring precise alignment between the tool axis and the machine tool spindle or workpiece. Attached Figure Description

[0017] Figure 1 This is one of the perspective views of this utility model.

[0018] Figure 2 This is the second perspective view of this utility model.

[0019] Figure 3 This is the front view of this utility model.

[0020] Figure 4 yes Figure 3 Sectional view along direction AA.

[0021] Explanation of reference numerals: 1-Fixed bracket, 2-First bushing, 3-Second bushing, 4-Spindle, 5-Sealing ring, 6-Second clearance, 7-Bearing, 8-Machining tool, 9-First drive mechanism, 10-Mounting plate, 11-Second drive mechanism, 12-Oil hole, 13-Oil groove, 14-Mounting groove, 15-First through hole, 16-Second through hole, 17-First mounting part, 18-Second mounting part, 19-Slide rail, 20-Slider, 21-Adjusting plate, 22-Adjusting hole, 23-Adjusting screw, 24-Adjusting handwheel, 25-Tool connector, 26-First synchronous pulley, 27-Second synchronous pulley, 28-Synchronous belt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Rather, the present utility model covers any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the present utility model as defined in the claims.

[0023] Furthermore, to provide the public with a better understanding of this utility model, certain specific details are described in detail in the following description. However, those skilled in the art can fully understand this utility model even without these detailed descriptions.

[0024] like Figures 1 to 4 The power cutting tool shown includes a fixed frame 1, a first bushing 2 mounted on the fixed frame 1, a second bushing 3 slidably fitted inside the first bushing 2 along the axial direction, and a spindle 4 rotatably fitted inside the second bushing 3 along the circumferential direction. The fixed frame 1 serves as the basic support structure for the entire power cutting tool and is fixedly mounted on the machine tool by bolts or other means to ensure its stability. The first bushing 2 is fixedly connected to the fixed frame 1 by bolts or other means, and the axis of the first bushing 2 is consistent with the feed direction of the cutting tool 8. In this embodiment, the cutting tool 8 feeds horizontally; however, in other embodiments, the cutting tool 8 can also feed longitudinally.

[0025] The second bushing 3 and the first bushing 2 are fitted with a clearance, meaning there is a first clearance between the first bushing 2 and the second bushing 3. To ensure smooth and stable axial sliding of the second bushing 3 within the first bushing 2, this embodiment provides an oil hole 12 on the first bushing 2 and a spiral oil groove 13 on the inner surface of the first bushing 2, with the oil hole 12 and the oil groove 13 connected. Through an external centralized lubrication system, lubricating oil or grease is injected through the oil hole 12 and diffused throughout the first clearance via the spiral oil groove 13, thereby forming a uniform oil film on the sliding surface of the second bushing 3. This ensures the sliding fit between the second bushing 3 and the first bushing 2 and effectively reduces friction and wear between the second bushing 3 and the first bushing 2 during axial movement, extending the service life of both the first bushing 2 and the second bushing 3.

[0026] Sealing rings 5 ​​are respectively provided at both ends of the first gap along its axial direction. An oil groove 13 is located between the sealing rings 5, thereby controlling the lubricating oil to flow only within the lubrication cavity formed between the sealing rings 5. The sealing rings 5 ​​prevent the entry of external contaminants and the leakage of internal lubricating oil. The sealing rings 5 ​​can be O-rings, Glyd rings, Step seals, etc. An installation groove 14 is provided on the inner surface of the first bushing 2, and the sealing rings 5 ​​are placed within the installation groove 14. This groove limits the sealing rings 5, preventing them from shifting due to the axial sliding of the second bushing 3, which would affect the sealing effect.

[0027] The second bushing 3 and the spindle 4 are fitted with a clearance fit, meaning there is a second clearance 6 between them. A bearing 7 is installed within this clearance 6. The bearing 7 serves two purposes: supporting the rotation of the spindle 4 and connecting the spindle 4 and the second bushing 3, ensuring synchronous axial movement. The second bushing 4 provides rigid support for the spindle 4, resisting the effects of cutting forces and bending stress from the tool, ensuring the spindle 4's motion accuracy and stability, guaranteeing precise alignment between the tool axis and the workpiece, and ensuring the machining quality of the workpiece.

[0028] The front end of the spindle 4 is provided with a tool joint 25. Depending on the processing needs, drill bits, reamers or chamfering tools can be selected as processing tools 8 and installed on the spindle 4 through the tool joint 25 to complete processing operations such as drilling, internal hole finishing, chamfering, and deburring.

[0029] The first bushing 2 has a first through hole 15 and a second through hole 16, both of which are elongated holes. The lengths of the first through hole 15 and the second through hole 16 are both greater than the axial travel of the second bushing 3, providing sufficient clearance for the axial movement of the second bushing 3. The second bushing 3 is externally fixedly fitted with a mounting plate 10, which has a first mounting part 17 and a second mounting part 18. The first mounting part 17 passes through the first through hole 15, and the second mounting part 18 passes through the second through hole 16.

[0030] The first drive mechanism 9, used to drive the spindle 4 to rotate circumferentially, is fixedly mounted on the first mounting part 17 on the mounting plate 10 by bolts or other means. The output shaft of the first drive mechanism 9 is connected to the rear end of the spindle 4. The first drive mechanism 9 can be configured as a servo motor. In this embodiment, a first synchronous pulley 26 is sleeved on the rear end of the spindle 4, and a second synchronous pulley 27 is sleeved on the output shaft of the first drive mechanism 9. A synchronous belt 28 is provided between the first synchronous pulley 26 and the second synchronous pulley 27. The synchronous belt 28 can efficiently transmit the rotational power of the first drive mechanism 9 to the spindle 4.

[0031] The second drive mechanism 11, which drives the second bushing 3 to move along its own axial direction, is fixedly mounted on the fixed frame 1 by bolts or other means. The output shaft of the second drive mechanism 11 is connected to the second mounting part 18 on the mounting plate 10. The second drive mechanism 11 can be configured as a servo motor or a cylinder. When the second drive mechanism 11 is started, the second bushing 3 drives the spindle 4, the mounting plate 10, the first drive mechanism 9 and its components to move synchronously along the axial direction, completing the linear feed motion of the machining tool 8.

[0032] A slide rail 19 is provided at the opening of the second through hole 16 along the driving direction of the second drive mechanism 11. A slider 20 is slidably arranged on the slide rail 19. The slider 20 is connected to the second mounting part 18 on the mounting plate 10. Through the sliding cooperation of the slide rail 19 and the slider 20, the stability and accuracy of the movement of the second bushing 3 are ensured on the one hand, and the second bushing 3 can be supported on the other hand.

[0033] This embodiment also includes an adjustment mechanism for fine-tuning the installation position of the first bushing 2 and its entire power unit on the fixed frame 1, thereby compensating for manufacturing errors and ensuring precise alignment between the tool axis and the machine tool spindle or workpiece. The adjustment mechanism includes an adjustment plate 21 sleeved on the outside of the first bushing 2. The adjustment plate 21 is connected to the fixed frame 1 or the machine tool by bolts or other means. Four adjustment holes 22 are formed along the radial direction of the first bushing 2 on the four edges of the adjustment plate 21: the upper edge, lower edge, left edge, and right edge. Each adjustment hole 22 is threaded with an adjustment screw 23. The inner end of the adjustment screw 23 is connected to the first bushing 2, and the outer end of the adjustment screw 23 is equipped with an adjustment handwheel 24. By rotating the adjustment handwheel 24, the first bushing 2 can be moved slightly within the fixed frame 1, achieving precise adjustment of multiple degrees of freedom in the radial direction.

[0034] During operation, the first drive mechanism 9 starts, and the spindle 4 and the machining tool 8 are rotated at high speed through the synchronous belt 28; at the same time, the second drive mechanism 11 drives the mounting plate 10 to drive the second bushing 3, the spindle 4 and the rotating machining tool 8 to feed in a straight line along the axial direction. Depending on the machining tool 8 selected, drilling, reaming or chamfering and other machining tasks are completed on the workpiece.

[0035] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the present utility model, and these should also be considered to fall within the protection scope of the present utility model.

Claims

1. A power cutting tool, characterized in that, The assembly includes a fixed frame (1), a first bushing (2) mounted on the fixed frame (1), a second bushing (3) slidably fitted inside the first bushing (2) along the axial direction, and a main shaft (4) rotatably fitted inside the second bushing (3) along the circumferential direction. A first gap exists between the first bushing (2) and the second bushing (3), and sealing rings (5) are respectively provided at both axial ends of the first gap. A lubrication cavity is formed between the sealing rings (5). A second gap (6) exists between the second bushing (3) and the main shaft (4), and a support for the main shaft (4) is provided within the second gap (6). The main spindle (4) has a rotating bearing (7), and a machining tool (8) is provided at the front end of the main spindle (4). A first drive mechanism (9) for driving the main spindle (4) to rotate in its own circumference is provided on the mounting plate (10), and the output shaft of the first drive mechanism (9) is connected to the rear end of the main spindle (4). The mounting plate (10) is sleeved on the outside of the second bushing (3). A second drive mechanism (11) for driving the second bushing (3) to move in its own axial direction is provided on the fixed frame (1), and the output shaft of the second drive mechanism (11) is connected to the mounting plate (10).

2. The power cutting tool according to claim 1, characterized in that, The first bushing (2) has an oil hole (12) and a spiral oil groove (13) is provided on the inner surface of the first bushing (2). The oil groove (13) is located between the sealing rings (5) and the oil hole (12) is connected to the oil groove (13).

3. The power cutting tool according to claim 2, characterized in that, The inner surface of the first bushing (2) is provided with an installation groove (14), and the sealing ring (5) is disposed in the installation groove (14).

4. The power cutting tool according to claim 3, characterized in that, The first bushing (2) is provided with a first through hole (15) and a second through hole (16). The mounting plate (10) is provided with a first mounting part (17) and a second mounting part (18). The first mounting part (17) passes through the first through hole (15) and is connected to the first drive mechanism (9). The second mounting part (18) passes through the second through hole (16) and is connected to the output shaft of the second drive mechanism (11).

5. The power cutting tool according to claim 4, characterized in that, Both the first through hole (15) and the second through hole (16) are elongated holes, and the lengths of the first through hole (15) and the second through hole (16) are greater than the axial travel of the second bushing (3).

6. The power cutting tool according to claim 5, characterized in that, A slide rail (19) is provided at the opening of the second through hole (16) along the driving direction of the second driving mechanism (11). A slider (20) is slidably provided on the slide rail (19). The slider (20) is connected to the second mounting part (18) on the mounting plate (10).

7. The power cutting tool according to claim 6, characterized in that, An adjusting plate (21) is fitted on the outside of the first bushing (2). Several adjusting holes (22) are opened on the four sides of the adjusting plate (21) along the radial direction of the first bushing (2). An adjusting screw (23) is threaded into each adjusting hole (22). The inner end of the adjusting screw (23) is connected to the first bushing (2). An adjusting handwheel (24) is provided on the outer end of the adjusting screw (23).

8. The power cutting tool according to claim 7, characterized in that, The front end of the spindle (4) is provided with a tool joint (25), and the machining tool (8) is mounted on the spindle (4) through the tool joint (25).

9. The power cutting tool according to claim 8, characterized in that, The machining tool (8) is configured as a drill bit, a reamer or a chamfering tool.

10. The power cutting tool according to claim 9, characterized in that, The rear end of the main shaft (4) is fitted with a first synchronous pulley (26), and the output shaft of the first drive mechanism (9) is fitted with a second synchronous pulley (27). A synchronous belt (28) is provided between the first synchronous pulley (26) and the second synchronous pulley (27).

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