Cutter for cutting shaft hole

Abstract

The utility model provides a cutter for cutting a shaft hole. The cutter comprises a fixed rod and an extension rod which are connected in sequence, the fixing rod is used for connecting and fixing cutters; the extension rod is used for being inserted into a threaded hole of a motor shaft. Cutters are mounted at the ends, away from the fixed rods, of the extension rods; a radial through notch is formed in one radial side of the extension rod; the cutter radially protrudes towards the notch; the maximum radial width of the extension rod provided with the cutter is smaller than the diameter of the threaded hole of the motor shaft; shaft hole machining of the motor shaft is achieved in the mode that the motor shaft is connected with the extension rod in a sleeved mode and moves in the radial direction and the axial direction. Through the arrangement of the gap, a space for radial movement of the motor shaft is formed between the extension rod and the hole wall of the threaded hole. And the cutter protrudes towards the notch, so that when the motor shaft moves in the radial direction, the cutter can cut a shaft hole meeting the diameter requirement.

Description

Technical Field

[0001] This utility model relates to the field of turning tool technology, specifically a tool for cutting shaft holes. Background Technology

[0002] In the field of motor design and manufacturing, the motor shaft, as a core transmission component, directly affects the motor's dynamic response performance and energy efficiency due to its weight and inertial resistance. To reduce the inertial resistance of the motor shaft, coaxially arranged shaft holes are typically machined between the threaded holes extending axially at both ends of the shaft to achieve weight reduction. The diameter of the shaft holes is usually larger than that of the threaded holes to maximize the weight reduction effect.

[0003] However, traditional turning methods present significant technical challenges when machining such shaft holes. Due to the presence of threaded holes, conventional turning tools are obstructed by the inner wall of the threaded hole when extending into the shaft, preventing the tool from reaching the bottom area of ​​the threaded hole and making it difficult to complete the machining of the entire length of the shaft hole. This problem limits the depth and machining efficiency of the shaft hole, thus affecting the lightweight optimization effect of the motor shaft. Utility Model Content

[0004] To address the technical problems in the background art, this utility model discloses a cutting tool for cutting shaft holes.

[0005] This utility model provides a cutting tool for cutting shaft holes, comprising a fixed rod and an extension rod connected in sequence;

[0006] The retaining rod is used for connecting and fixing the cutting tool;

[0007] The extension rod is used to insert into the threaded hole of the motor shaft;

[0008] A cutter is installed at the end of the extension rod away from the fixed rod;

[0009] A radial through notch is provided on the radial side of the extension rod;

[0010] The cutter protrudes radially towards the notch;

[0011] The maximum radial width of the extension rod where the cutter is located is less than the diameter of the threaded hole.

[0012] Furthermore, the side of the extension rod with the notch protrudes in the direction of the notch.

[0013] Furthermore, the side of the extension rod with the notch is arc-shaped.

[0014] Furthermore, the outer diameter of the extension rod, which is coaxial with the fixed rod, is larger than the diameter of the fixed rod.

[0015] Furthermore, the extension rod and the fixing rod are connected at the notch location by an inclined connecting surface; the connecting surface is a raised arc-shaped surface.

[0016] Furthermore, the end of the extension rod is provided with a mounting part; the mounting part is provided with a recessed locking platform; the bottom of the locking platform extends in the direction of the notch, forming a support surface that conforms to the shape of the cutter.

[0017] Furthermore, the connection between the mounting part and the extension rod is made by an inclined transition surface; the outlet of the cutting fluid hole extends from the transition surface, and the inlet extends from the end of the fixing rod; the outlet of the cutting fluid hole is directly opposite the center of the cutter.

[0018] Furthermore, the cutter is parallelogram-shaped; the line connecting the vertices of the acute angle of the cutter is perpendicular to the axis of the fixed rod.

[0019] The beneficial effects of this utility model are: 1. The extension rod is provided with the maximum radial width of the cutter, so that the cutter and the extension rod can be inserted into the threaded hole at the end of the motor shaft without obstruction; 2. The notch is provided so that a space for the motor shaft to move radially is formed between the extension rod and the hole wall of the threaded hole; and the cutter protrudes in the direction of the notch, so that when the motor shaft moves radially, the cutter can cut a shaft hole that meets the diameter requirements. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a top view of the present invention;

[0023] Figure 3 yes Figure 2 Sectional view of AA;

[0024] Figure 4 yes Figure 2 Sectional view of BB;

[0025] Figure 5 This is a front sectional view of the present invention;

[0026] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0027] Figure 7 This is a structural schematic diagram of the concealed cutter and bolt of this utility model;

[0028] Figure 8 This is a schematic diagram of the motor shaft sleeved with the extension rod;

[0029] Figure 9This is a schematic diagram showing the radial movement of the motor shaft during cutting.

[0030] Figure 10 This is a schematic diagram showing the machining of the shaft hole on one side of the motor shaft;

[0031] In the diagram: 1. Fixed rod; 2. Extension rod; 3. Cutting blade; 4. Notch; 5. Connecting surface; 6. Mounting part; 7. Clamping platform; 9. Transition surface; 10. Cutting fluid hole; 11. Bolt; 12. Threaded hole; 13. Shaft hole; 14. Motor shaft; 31. Cutting end; 61. Plane. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0033] like Figure 1 and Figure 2 As shown, this utility model discloses a cutting tool for cutting shaft holes, including a fixed rod 1 and an extension rod 2 connected in sequence and arranged coaxially. The fixed rod 1 and the extension rod 2 are made of cemented carbide.

[0034] The fixing rod 1 is provided with a profile for fixing the tool by connecting it to the profile.

[0035] The extension rod 2 is used to insert into the threaded holes 12 located at the center of both ends of the motor shaft 14 and extending axially. Figure 2 For reference, a radially penetrating notch 4 is provided on the lower side of the extension rod 2. A mounting part 6 is provided at the left end of the extension rod 2. The mounting part 6 protrudes downward and is fitted with a parallelogram-shaped cutter 3. The specific mounting structure is as follows: the mounting part 6 forms a plane 61 perpendicular to the notch 4 through a cutting method. (See image below.) Figure 7 As shown, a recessed, V-shaped mounting platform 7 is provided on plane 61. The bottom of the mounting platform 7 extends towards the notch 4, forming a support surface that conforms to the shape of the cutter 3. Bolt 11 passes through the cutter 3 and is threadedly connected to the mounting part 6 to secure the cutter 3. The line connecting the obtuse angles of the cutter 3 divides the cutter 3 into two symmetrical parts, one of which is engaged within the mounting platform 7. The support surface provides overall support for the cutter 3, causing the area of ​​the cutter 3 located outside the mounting platform 7 to protrude towards the notch 4. This not only improves the positional accuracy of the cutter 3 but also enhances its positional stability.

[0036] The maximum radial width of the extension rod 2 where the cutter 3 is located is less than the diameter of the threaded hole 12 of the motor shaft 14, so that the cutter 3 and the extension rod 2 can be inserted into the threaded hole 12 at the end of the motor shaft 14 without obstruction.

[0037] like Figure 5 and Figure 6As shown, the cutting end 31 is located in the area outside the chuck 7 and is facing away from the fixing rod 1. The leftmost side of this cutting end 31 extends beyond the mounting part 6 to the left, so that when the shaft hole 13 is machined, the mounting part 6 will not contact the motor shaft 14, and no additional resistance will be generated.

[0038] It can be seen that the notch 4 creates a space for the motor shaft 14 to move radially between the extension rod 2 and the hole wall of the threaded hole 12; and the cutter 3 protrudes in the direction of the notch 4, so that when the motor shaft 14 moves radially, the cutter 3 can cut a shaft hole 13 that meets the diameter requirements.

[0039] The diameter of the outer side of the extension rod 2, which is coaxial with the fixed rod 1, is larger than the diameter of the fixed rod 1. The side of the extension rod 2 with the notch 4 protrudes towards the notch 4, as shown below. Figure 3 As shown, in this embodiment, the protrusion is arc-shaped. The connection between the extension rod 2 and the fixing rod 1 at the notch 4 is achieved through an inclined connecting surface 5; as shown... Figure 4 As shown, the connecting surface 5 is a raised arc-shaped surface. This design makes the extension rod 2 stronger and more rigid, and prevents vibration during turning, thus preventing vibration marks from appearing on the hole wall of the shaft hole 13.

[0040] The connection between the mounting part 6 and the extension rod 2 is made by an inclined transition surface 9; such as Figure 5 As shown, the outlet of the cutting fluid hole 10 extends from the transition surface 9, and the inlet extends from the end of the fixing rod 1; the outlet of the cutting fluid hole 10 is directly opposite the center of the cutter 3. The cutting fluid flows in from the inlet of the cutting fluid hole 10 and flows out from the outlet, spraying onto the cutter 3 for cutting and cooling. The design of the cutting fluid hole 10 overcomes the problem of insufficient cooling space and also makes the structure of this utility model more compact.

[0041] The operation steps of this utility model are as follows:

[0042] S1, such as Figure 8 As shown, one end of the motor shaft 14 to be processed is sleeved with the extension rod 2, so that the cutter 3 extends to the bottom of the threaded hole 12;

[0043] S2, drive motor shaft 14 to rotate;

[0044] S3, such as Figure 9 As shown, the drive motor shaft 14 moves radially;

[0045] S4, such as Figure 10 As shown, the drive motor shaft 14 moves axially in the direction of the tool;

[0046] S5. When the extension rod 2 is entirely located in the motor shaft 14, stop driving the motor shaft 14 to rotate, and remove the motor shaft 14 to separate it from the tool.

[0047] S6, disassemble and assemble the motor shaft 14 so that its other end faces the tool;

[0048] S7. Repeat steps S1-S5 to complete the machining of shaft hole 13.

[0049] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A cutting tool for cutting shaft holes, characterized in that: It includes a fixed rod (1) and an extension rod (2) connected in sequence; The fixing rod (1) is used for connecting and fixing the tool; The extension rod (2) is used to insert into the threaded hole (12) of the motor shaft (14); A cutter (3) is installed at the end of the extension rod (2) away from the fixed rod (1); The extension rod (2) has a radial through notch (4) on its radial side; The cutter (3) protrudes radially toward the notch (4); The maximum radial width of the extension rod (2) where the cutter (3) is located is smaller than the diameter of the threaded hole (12).

2. The cutting tool for cutting shaft holes according to claim 1, characterized in that: The side of the extension rod (2) with a notch (4) protrudes in the direction of the notch (4).

3. The cutting tool for cutting shaft holes according to claim 2, characterized in that: The extension rod (2) has a notch (4) on its side which is arc-shaped.

4. The cutting tool for cutting shaft holes according to claim 1, characterized in that: The outer diameter of the extension rod (2) coaxial with the fixed rod (1) is larger than the diameter of the fixed rod (1).

5. The cutting tool for cutting shaft holes according to claim 1, characterized in that: The extension rod (2) and the fixing rod (1) are connected at the notch (4) by an inclined connecting surface (5); The connecting surface (5) is a raised arc-shaped surface.

6. The cutting tool for cutting shaft holes according to claim 1, characterized in that: The end of the extension rod (2) is provided with a mounting part (6); The mounting part (6) is provided with a recessed mounting plate (7); The bottom of the card plate (7) extends towards the notch (4) to form a support surface that conforms to the shape of the cutter (3).

7. The cutting tool for cutting shaft holes according to claim 6, characterized in that: The mounting part (6) and the extension rod (2) are connected by an inclined transition surface (9); The outlet of the cutting fluid hole (10) extends from the transition surface (9), and the inlet extends from the end of the fixing rod (1); The outlet of the cutting fluid hole (10) is directly opposite the center of the cutter (3).

8. The cutting tool for cutting shaft holes according to claim 1, characterized in that: The cutter (3) is parallelogram-shaped; The line connecting the acute angle vertex of the cutter (3) is perpendicular to the axis of the fixing rod (1).

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