A combined tool for machining motor shaft

Abstract

The present invention discloses a combined tool for machining a motor shaft, comprising: a cutter body, which can rotate at high speed with its virtual central axis; a blade, which is a circular structure, has a through hole in the center, and is fixedly mounted on the cutter body; an outer cylinder, which is detachably connected to the cutter body and has a thread inside; an inner cylinder, which is adapted to the outer cylinder, and has an expansion ring at one end, the outer diameter of the inner cylinder is smaller than the inner diameter of the through hole, and the outer diameter of the expansion ring is larger than the inner diameter of the through hole; a limiting ring, which is fixedly sleeved on the outer wall of the inner cylinder; a limiting groove, which is provided in the form of an annular ring on the inner wall of the outer cylinder, and is slidably connected to the limiting ring. In the present invention, when the cutter body rotates at high speed, the blade rotates accordingly, and the processing part of the blade and the motor shaft rigidly rub against each other to generate heat and form wear. After wear, the processing part of the blade becomes unbalanced in weight, so that the processing part moves upward due to its light weight, forming the rotation of the blade itself, thereby automatically changing the position of the processing part of the blade.

Description

Technical Field

[0001] The invention relates to the technical field of milling cutters, and in particular to a combined cutter for machining a motor shaft. Background Art

[0002] The machining process of the motor shaft can be divided into two stages: preparatory machining and forming machining. The preparatory machining of the shaft includes round steel straightening, blank cutting, flat end face and center hole drilling, etc. The purpose of preparatory machining is to provide qualified blanks and make process positioning references for forming machining. Forming machining includes rough turning, semi-finishing turning, finishing turning, external circle grinding, keyway milling, etc. The purpose of forming machining is to process the blank into the shape and size of the structural design, and the tools used for the above machining are also crucial.

[0003] A tool for machining motor shafts is a face milling cutter. The face milling cutter is usually fixedly connected to the spindle of a machine tool and performs high-speed rotation through the spindle power transmission. The structure includes a cutter body, multiple blades and fastening bolts. Since the blades are continuously worn during machining, the precision is not accurate. Therefore, the existing solution to this problem is to check the wear of the blades during machining. If the wear exceeds the specified range, the blades are replaced. The replacement method is usually to remove the fastening bolts first, select a new blade or change the position of the worn blade to change the blade machining part, and then tighten the fastening bolts to complete the replacement. However, this method has the following defects:

[0004] When the wear exceeds the specified range, if the tool is still in the working state, the processing will be forced to stop, and the tool must wait for complete cooling before replacement. The fixed wear part of the blade wears faster during processing, resulting in a high frequency of forced stopping of processing. At the same time, the heat dissipation of the tool during wear must also be taken into account during replacement, which ultimately results in extended processing time for the motor shaft and slowing down the processing process. Summary of the invention

[0005] The purpose of the present invention is to propose a combined tool for machining motor shafts, which automatically changes the rigid contact portion of the blade on the motor shaft during the machining process. Due to the continuous change, the overall wear of the blade is slower, extending the replacement cycle and automatically replacing the worn portion of the blade.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A combined tool for machining a motor shaft, comprising:

[0008] The cutter body can rotate at high speed about its virtual center axis;

[0009] The blade is a circular structure with a through hole in the center and is fixedly mounted on the blade body;

[0010] The outer cylinder is detachably connected to the cutter body and has threads therein;

[0011] The inner cylinder is matched with the outer cylinder, and one end of the inner cylinder has an expansion ring, the outer diameter of the inner cylinder is smaller than the inner diameter of the perforation, and the outer diameter of the expansion ring is larger than the inner diameter of the perforation;

[0012] A limiting ring, fixedly sleeved on the outer wall of the inner cylinder;

[0013] The limiting groove is provided in an annular form on the inner wall of the outer cylinder and is slidably connected with the limiting ring;

[0014] When the cutter body rotates at high speed, the blade rotates accordingly. The processing part of the blade and the rigid friction of the motor shaft generate heat and form wear. After wear, the processing part of the blade becomes unbalanced in weight, causing the processing part to move upward due to its light weight, causing the blade to rotate itself, thereby automatically changing the position of the processing part of the blade.

[0015] Preferably, the cutter body is provided with a groove, a sphere is provided in the groove for limited sliding, part of the sphere is located outside the cutter body, the sphere is in point contact with a blade mounted on the cutter body, and the sphere is nested in the groove.

[0016] Preferably, the cutter body is provided with a through groove, through which the outer cylinder and the inner cylinder can pass, and the outer cylinder is fixed inside the through groove by tightening the fastening bolts.

[0017] Preferably, a mounting groove is provided at the center of the cutter body, a thread is provided inside the mounting groove, the cutter body is connected to the spindle of the machine tool by tightening bolts, and the cutter body can be driven by the power of the spindle part of the machine tool to rotate at high speed.

[0018] Preferably, the combination tool also includes a fixed frame, which is fixedly connected to the cutter body and rotatably connected to a rotating shaft. One end of the rotating shaft is fixedly sleeved with a driving wheel, and the other end is fixedly provided with a plurality of equidistantly arranged fan blades. The driving wheel has a plurality of air holes, and the air holes pass through the driving wheel. A rubber ring is fixedly sleeved on the outer edge of the driving wheel, and the outer edge of the rubber ring is in point contact with the outer edge of the blade.

[0019] Preferably, a protective device is arranged around the periphery of the multiple fan blades to protect the fan blades from damage by metal debris. The protective device includes two protective rings, which are arranged coaxially with the rotating shaft. The two protective rings are fixedly connected to each other by multiple first connecting blocks, one of the protective rings is fixedly connected to the rotating shaft by multiple second connecting blocks, and filters are arranged in the inner circle area of ​​the protective ring and the area between the two protective rings.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] When the cutter body rotates at high speed in the present invention, the blade rotates accordingly, and the processing part of the blade and the motor shaft rigidly rub against each other to generate heat and form wear. After wear, the processing part of the blade becomes weight-unbalanced, so that the processing part moves upward due to its light weight, causing the blade to rotate itself, thereby automatically changing the position of the processing part of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a combined tool for machining a motor shaft proposed by the present invention;

[0023] Figure 2 A schematic diagram of the structural decomposition of a combined tool for machining a motor shaft proposed by the present invention;

[0024] Figure 3 A schematic diagram of the connection structure between a blade and a driving wheel in a combined tool for machining a motor shaft proposed by the present invention;

[0025] Figure 4 A schematic diagram of the connection structure between a driving wheel and a cutter body in a combined cutter for machining a motor shaft proposed by the present invention;

[0026] Figure 5 This is a schematic diagram of the structural decomposition of a protective device in a combined tool for machining a motor shaft proposed by the present invention;

[0027] Figure 6 for Figure 1 Schematic diagram of the structure from another perspective.

[0028] In the figure: 1. knife body; 2. blade; 3. outer cylinder; 4. inner cylinder; 5. limit ring; 6. limit groove; 7. groove; 8. sphere; 9. through groove; 10. mounting groove; 11. fastening bolt; 12. main shaft; 13. fixing frame; 14. rotating shaft; 15. driving wheel; 16. fan blade; 17. air hole; 18. rubber ring; 19. protective ring; 20. first connecting block; 21. second connecting block; 22. filter; 23. expansion ring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Reference Figure 1 -Attached Figure 6 , a combined tool for machining a motor shaft, comprising:

[0031] The cutter body 1 can rotate at high speed about its virtual center axis;

[0032] The blade 2 is a circular structure with a through hole in the center and is fixedly mounted on the blade body 1;

[0033] The outer cylinder 3 is detachably connected to the cutter body 1 and has a thread therein;

[0034] The inner cylinder 4 is matched with the outer cylinder 3, and one end of the inner cylinder 4 has an enlarged ring 23, the outer diameter of the inner cylinder 4 is smaller than the inner diameter of the perforation, and the outer diameter of the enlarged ring 23 is larger than the inner diameter of the perforation;

[0035] The limiting ring 5 is fixedly sleeved on the outer wall of the inner tube 4;

[0036] The limiting groove 6 is formed in an annular shape on the inner wall of the outer tube 3 and is slidably connected with the limiting ring 5;

[0037] When the cutter body 1 rotates at high speed, the blade 2 rotates accordingly. The processing part of the blade 2 and the rigid friction of the motor shaft generate heat and form wear. After wear, the processing part of the blade 2 becomes unbalanced in weight, causing the processing part to move upward due to its light weight, causing the blade 2 to rotate itself, thereby automatically changing the position of the processing part of the blade 2.

[0038] The cutter body 1 is provided with a groove 7, in which a ball 8 is provided for limited sliding. Part of the ball 8 is located outside the cutter body 1, and the ball 8 is in point contact with a blade 2 mounted on the cutter body 1. The ball 8 is nested in the groove 7 and cannot be separated.

[0039] The cutter body 1 is provided with a through groove 9 , through which the outer cylinder 3 and the inner cylinder 4 can pass, and the outer cylinder 3 is fixed inside the through groove 9 by tightening the fastening bolts 11 .

[0040] A mounting groove 10 is provided at the center of the cutter body 1, and a thread is provided inside the mounting groove 10. The cutter body 1 is connected to a spindle 12 of a machine tool by a fastening bolt 11, and the cutter body 1 can rotate at high speed by partial power drive of the spindle 12 of the machine tool.

[0041] The combined tool also includes a fixed frame 13, which is fixedly connected to the tool body 1, and the fixed frame 13 is rotatably connected to a rotating shaft 14. One end of the rotating shaft 14 is fixedly sleeved with a driving wheel 15, and the other end is fixedly provided with a plurality of equidistantly arranged fan blades 16. The driving wheel 15 has a plurality of air holes 17, and the air holes 17 pass through the driving wheel 15. A rubber ring 18 is fixedly sleeved on the outer edge of the driving wheel 15, and the outer edge of the rubber ring 18 is in point contact with the outer edge of the blade 2.

[0042] A protective device is arranged outside the multiple fan blades 16 to protect the fan blades 16 from damage by metal debris. The protective device includes two protective rings 19. The protective rings 19 are arranged coaxially with the rotating shaft 14. The two protective rings 19 are fixedly connected to each other through multiple first connecting blocks 20. One of the protective rings 19 is fixedly connected to the rotating shaft 14 through multiple second connecting blocks 21. Filters 22 are arranged in the inner circle area of ​​the protective ring 19 and the area between the two protective rings 19.

[0043] Working principle:

[0044] Each blade 2 is fixedly mounted on the cutter body 1 by means of fastening bolts 11, and the cutter body 1 is fixedly mounted on the spindle 12 of the machine tool by means of fastening bolts 11, and the spindle 12 can be driven to rotate at high speed by means of electricity;

[0045] The cutter body 1 rotates at high speed to perform milling on the motor shaft. The wind flow formed by the high-speed rotation blows the fan blades 16 to rotate the shaft 14, driving the driving wheel 15 to rotate synchronously. The sliding friction force of the rubber ring 18 drives the blade 2 to rotate in the opposite direction, so that the rigid contact part of the blade 2 on the motor shaft is continuously and automatically changed.

[0046] It should be noted that:

[0047] Attached Figure 2 The two fastening bolts 11 are respectively used for fastening the blade 2 on the knife body 1 and for fastening the knife body 1 on the spindle 12, and only the models are different.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A combined tool for machining a motor shaft, characterized in that: include: The cutter body (1) is capable of rotating at high speed about its virtual central axis; The blade (2) is of circular structure, has a through hole at the center, and is fixedly mounted on the blade body (1); The outer cylinder (3) is detachably connected to the cutter body (1) and has a thread therein; The inner cylinder (4) is matched with the outer cylinder (3), and one end of the inner cylinder has an expansion ring (23). The outer diameter of the inner cylinder (4) is smaller than the inner diameter of the through hole, and the outer diameter of the expansion ring (23) is larger than the inner diameter of the through hole. A limiting ring (5) is fixedly sleeved on the outer wall of the inner tube (4); The limiting groove (6) is formed in an annular shape on the inner wall of the outer cylinder (3) and is slidably connected to the limiting ring (5); When the cutter body (1) rotates at a high speed, the blade (2) rotates accordingly, and the processing portion of the blade (2) and the motor shaft rigidly rub against each other to generate heat and form wear. After the wear, the processing portion of the blade (2) becomes unbalanced in weight, so that the processing portion moves upward due to its light weight, causing the blade (2) to rotate itself, thereby automatically changing the position of the processing portion of the blade (2); The combined tool further comprises a fixing frame (13), the fixing frame (13) being fixedly connected to the tool body (1), the fixing frame (13) being rotatably connected to a rotating shaft (14), one end of the rotating shaft (14) being fixedly sleeved on a driving wheel (15), and the other end of the rotating shaft (14) being fixedly provided with a plurality of equidistantly arranged fan blades (16), the driving wheel (15) being provided with a plurality of air holes (17), the air holes (17) penetrating the driving wheel (15), the outer edge of the driving wheel (15) being fixedly sleeved with a rubber ring (18), the outer edge of the rubber ring (18) being in point contact with the outer edge of the blade (2).

2. The combined tool for machining a motor shaft according to claim 1, characterized in that: The cutter body (1) is provided with a groove (7), a sphere (8) is provided in the groove (7) for limited sliding, a portion of the sphere (8) is located outside the cutter body (1), the sphere (8) is in point contact with a blade (2) mounted on the cutter body (1), and the sphere (8) is nested in the groove (7).

3. The combined tool for machining a motor shaft according to claim 1, characterized in that: The cutter body (1) is provided with a through groove (9) through which the outer cylinder (3) and the inner cylinder (4) can pass, and the outer cylinder (3) is fixed inside the through groove (9) by tightening the fastening bolts (11).

4. The combined tool for machining a motor shaft according to claim 1, characterized in that: A mounting groove (10) is provided at the center of the cutter body (1), and a thread is provided inside the mounting groove (10). The cutter body (1) is connected to a main shaft (12) of a machine tool by means of a fastening bolt (11), and the cutter body (1) is driven by a partial power of the main shaft (12) on the machine tool so that the cutter body (1) can rotate at a high speed.

5. The combined tool for machining a motor shaft according to claim 1, characterized in that: A protective device is arranged outside the plurality of blades (16) to protect the blades (16) from damage by metal debris. The protective device comprises two protective rings (19). The protective rings (19) are arranged coaxially with the rotating shaft (14). The two protective rings (19) are fixedly connected to each other via a plurality of first connecting blocks (20). One of the protective rings (19) is fixedly connected to the rotating shaft (14) via a plurality of second connecting blocks (21). A filter screen (22) is arranged in the inner ring area of ​​the protective ring (19) and in the area between the two protective rings (19).

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