A design method for a cylindrical diamond dressing tool for dressing internal meshing honing wheels

Abstract

This invention relates to the field of gear machining technology, specifically to a design method for a cylindrical diamond dressing tool for dressing internal meshing honing wheels. The method includes: determining the design parameters of the cylindrical diamond dressing tool; determining the working clearance angle; calculating the installation parameters; obtaining the cutting edge on the tool end face from the calculated offset conjugate surface; and using 3D software to axially helically stretch the cutting edge on the end face to obtain a 3D solid model of the tool. This design method can produce a cylindrical diamond dressing tool with a structural clearance angle, which not only simplifies the tool manufacturing and inspection process but also improves the strength and durability of the diamond cutting edge.

Description

Technical Field

[0001] This invention relates to the field of gear machining technology, and more specifically to a cylindrical diamond dressing tool for dressing internal meshing honing wheels. Background Technology

[0002] Gears are key basic components in many industries, and their machining process directly affects the stability of gear transmission performance. In recent years, with the rapid development of the new energy vehicle industry, the industry has placed higher demands on the noise, vibration, and harshness (NVH) performance of new energy vehicle reducers, which in turn has led to a continuous increase in the requirements for gear machining accuracy. Internal gear honing, as a highly efficient method for machining hardened precision gears for new energy vehicles, can significantly optimize the meshing vibration and noise problems of high-speed gear transmissions.

[0003] The internal meshing honing wheel is the core tool for internal meshing gear honing. Currently, the industry mainly uses gear-shaped diamond dressing tools for dressing it. Because the diamond dressing tool and the honing wheel are spatially distributed in an alternating axis manner, when performing dressing operations at symmetrical positions on the honing wheel, in order to avoid interference between the back face of the diamond dressing tool and the surface of the honing wheel, the diamond dressing tool needs to be designed with a back angle structure similar to a gear shaper.

[0004] However, the aforementioned structural clearance angle design presents numerous challenges to the manufacturing and application of diamond dressing tools. On one hand, during the manufacturing process, diamond dressing tools with a structural clearance angle require simultaneous consideration of the cutting edge accuracy of both the rake and flank faces, necessitating real-time adjustment of the laser machining incident angle, significantly increasing the manufacturing difficulty. On the other hand, the presence of the structural clearance angle significantly reduces the overall strength of the tool's cutting edge, making the top and sharp-side cutting edges prone to chipping and failure, thus affecting tool life and dressing accuracy. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a design method for a cylindrical diamond dressing tool for dressing internal meshing honing wheels. The designed diamond dressing tool with no structural back angle has an appearance similar to a cylindrical gear, eliminating the need to separately control the cutting edge accuracy of the rake face and flank face during tool manufacturing and testing.

[0006] The present invention achieves the above-mentioned technical objectives through the following technical means:

[0007] A design method for a cylindrical diamond dressing tool for dressing internal meshing honing wheels, characterized in that the cylindrical diamond dressing tool includes a tool base, a gear-shaped diamond sheet and a pressure ring, wherein the tool base and the gear-shaped diamond sheet are both cylindrical, and the pressure ring coaxially presses and fixes the gear-shaped diamond sheet and the tool base;

[0008] The design method includes:

[0009] Based on the parameters of the grinding wheel being processed, the design parameters of the cylindrical diamond dressing tool are determined;

[0010] Determine the working back angle λ of the cylindrical diamond dressing tool;

[0011] Calculate the installation parameters of the cylindrical diamond dressing tool, including the axis intersection angle Σ, center distance a, offset distance e, and meshing angle κ;

[0012] Based on the current installation parameters of the cylindrical diamond dressing tool, the conjugate surface that is conjugate with the grinding wheel surface is calculated in the grinding wheel coordinate system;

[0013] The conjugate surface is transformed to the tool coordinate system, and the end face cutting edge of the cylindrical diamond dressing tool is cut off on the conjugate surface.

[0014] In 3D modeling software, the end face cutting edge is spirally stretched along the axial direction according to the tool helix angle to finally obtain the 3D solid model of the cylindrical diamond dressing tool.

[0015] Furthermore, the design parameters include: number of teeth z t Modulus m n Pressure angle α n Helix angle β t Tooth tip circle diameter da t Root circle diameter df t and displacement coefficient x n2 .

[0016] Furthermore, the value range of the working back angle λ is λ∈[5°~15°].

[0017] Furthermore, the formula for calculating the axial angle of the cylindrical diamond dressing tool is as follows: ,β w β is the helix angle of the dressed grinding wheel. t The helix angle of the cylindrical diamond dressing tool.

[0018] Furthermore, the formula for calculating the meshing angle κ of the cylindrical diamond dressing tool is as follows: , where λ is the working back angle of the cylindrical diamond dressing tool.

[0019] Furthermore, the formula for calculating the center distance 'a' of the cylindrical diamond dressing tool is as follows: , among which, da t df is the tip circle diameter of the cylindrical diamond dressing tool. w The root circle diameter of the grinding wheel is given.

[0020] Furthermore, the formula for calculating the offset distance e of the cylindrical diamond dressing tool is as follows: , among which, da t df is the tip circle diameter of the cylindrical diamond dressing tool. w The root circle diameter of the grinding wheel is given.

[0021] Furthermore, during tool setting, the cylindrical diamond dressing tool and the grinding wheel are fed along the direction of the meshing angle κ; during multiple dressing processes, the radial feed and retraction directions of the cylindrical diamond dressing tool are also executed along the direction of the meshing angle κ.

[0022] Furthermore, the cylindrical diamond dressing tool is used as follows: the cylindrical diamond dressing tool is installed at an angle and offset on one side of the symmetrical center line of the grinding wheel. The cylindrical diamond dressing tool and the grinding wheel are forced to rotate synchronously. At the same time, the cylindrical diamond dressing tool is fed along the axis of the grinding wheel to achieve the dressing of the honing grinding wheel.

[0023] The beneficial effects of this invention are:

[0024] 1) Compared with traditional diamond dressing tools with structured back angles, the diamond dressing tool without structured back angles designed in this invention has better cutting edge strength and higher durability.

[0025] 2) Compared with traditional diamond dressing tools with structured back angles, the diamond dressing tool without structured back angles designed in this invention has a consistent cross-sectional shape for each axis. During manufacturing and inspection, there is no need to separately control the cutting edge accuracy of the rake face and the back face, which can significantly reduce the manufacturing process difficulty of the tool. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cylindrical diamond dressing tool according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the installation of a cylindrical diamond dressing tool according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram showing the positional relationship between the cylindrical diamond dressing tool and the grinding wheel in an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0030] The main parameters of the internal meshing honing wheel to be dressed are: number of teeth z w =97, Modulus m n =1.745 mm, pressure angle α n =17°, helix angle β w =10.229° (left-handed), tooth tip circle diameter da w =169.5 mm, root circle radius df w =178.92 mm, displacement coefficient x n1 =0.54 mm.

[0031] A cylindrical diamond dressing tool for dressing internal meshing honing wheels, such as Figure 1 As shown, the tool 4 includes a tool base 1, a gear-shaped diamond sheet 2, and a pressure ring 3. Both the tool base 1 and the gear-shaped diamond sheet 2 are cylindrical, and the gear-shaped diamond sheet 2 is coaxially fastened to the tool base 1 by the pressure ring 3.

[0032] like Figure 2 The diagram shown is an installation schematic of a cylindrical diamond dressing tool 4 meshing with a honing wheel in an embodiment of the present invention.

[0033] The design method for the cylindrical diamond dressing tool 4 specifically includes:

[0034] Step 1: Based on the parameters of the dressing wheel 5, determine the design parameters of the cylindrical diamond dressing tool 4, including: number of teeth z. t =29, Modulus m n =1.745 mm, pressure angle α n =17°, helix angle β t =18.25° (right-handed), tooth tip circle diameter da t =56.4mm, root circle diameter df t =47.2 mm, displacement coefficient x n2 =0.074mm.

[0035] Step 2: Based on the range of λ ∈ [5°~15°], determine the working back angle λ = 10° for the cylindrical diamond dressing tool 4.

[0036] Step 3: Calculate the installation parameters of the cylindrical diamond dressing tool 4, specifically including:

[0037] The formula for calculating the intersecting angle Σ of the axes The calculated angle Σ is 8.021°.

[0038] The formula for calculating the meshing angle κ The meshing angle κ of the cylindrical diamond dressing tool 4 was calculated to be 32.089°.

[0039] The formula for calculating the center distance 'a' The center distance a of the cylindrical diamond dressing tool 4 was calculated to be 51.563 mm.

[0040] The formula for calculating the offset distance e The offset distance e of the cylindrical diamond dressing tool 4 was calculated to be 33.822 mm, where da t df is the tip circle diameter of the cylindrical diamond dressing tool 4. w The root circle diameter of the grinding wheel 5 is given.

[0041] Step 4: Based on the current installation parameters of the cylindrical diamond dressing tool 4, calculate the conjugate surface that is conjugate with the grinding wheel surface in the grinding wheel coordinate system.

[0042] Step 5: Transform the conjugate surface to the tool coordinate system, and cut the end face cutting edge of the cylindrical diamond dressing tool 4 on the conjugate surface.

[0043] Step 6: In the 3D modeling software, the end face cutting edge is spirally stretched along the axis according to the tool helix angle to finally obtain the 3D solid model of the cylindrical tool 4.

[0044] like Figure 3 The diagram shows a typical usage of the cylindrical diamond dressing tool 4 in this invention: the cylindrical diamond dressing tool 4 is mounted at an angle and offset on the axis of symmetry x of the honing wheel. w One side. Let the tool rotation axis z be... t With respect to the axis of rotation of the grinding wheel z w The included angle is the axis intersection angle Σ. The shortest distance between the tool center and the grinding wheel center in the y-axis direction is the center distance a, and the shortest distance between the tool center and the grinding wheel center in the x-axis direction is the offset distance e. At this time, in the grinding wheel coordinate system, x w A meshing angle κ is formed between the axis and the line connecting the actual cutting point of the tool and the center of the grinding wheel. Compared with the traditional method of dressing the grinding wheel symmetrically with diamond dressing tools, this invention uses a cylindrical diamond dressing tool 4 offsetly mounted on one side for honing, allowing the diamond dressing tool to be designed as a uniform cross-section cylinder with no structural back angle. Since the profile of any axial cross-section is completely consistent, manufacturing and inspection only need to ensure the profile accuracy of the cylindrical surface, without needing to consider the rake and flank face morphology, greatly simplifying the laser grinding process and significantly improving the cutting edge strength.

[0045] like Figure 3 As shown, during the process of dressing the grinding wheel 5 using the cylindrical diamond dressing tool 4, the grinding wheel 5 moves at an angular velocity ω. w The cylindrical diamond dressing tool 4 rotates at a constant speed with an angular velocity ω. t They rotate at a constant speed and satisfy a forced meshing relationship ω w / ω t =z w / z t Simultaneously, the cylindrical diamond dressing tool 4 feeds along the axis of the grinding wheel to complete the full tooth width dressing. In addition, the tool setting and radial entry and exit of the cylindrical diamond dressing tool 4 for multiple dressing operations are all performed along the meshing angle κ, ensuring a stable machining process and repeatable trajectory.

[0046] According to an embodiment of the present invention, a design method for a cylindrical diamond dressing tool for dressing internal meshing honing wheels is disclosed. Although the designed diamond dressing tool has no structural clearance angle, by offset mounting the diamond dressing tool on one side of the grinding wheel for honing, the tool's flank face and the honing wheel surface can form a sufficient working clearance angle. The diamond dressing tool of this embodiment has a shape similar to a cylindrical gear, with all its axial cross-sectional shapes being completely identical. Therefore, during tool manufacturing and inspection, it is not necessary to separately control the cutting edge accuracy of the rake and flank faces, significantly reducing the difficulty of tool manufacturing. Simultaneously, the diamond dressing tool without a structural clearance angle exhibits significantly superior cutting edge strength compared to traditional diamond dressing tools with a structural clearance angle.

[0047] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A design method for a cylindrical diamond dressing tool for dressing internal meshing honing wheels, characterized in that, The cylindrical diamond dressing tool (4) includes a tool base (1), a gear-shaped diamond sheet (2) and a pressure ring (3). The tool base (1) and the gear-shaped diamond sheet (2) are both cylindrical. The pressure ring (3) coaxially presses and fixes the gear-shaped diamond sheet (2) and the tool base (1). The design method includes: Based on the parameters of the grinding wheel (5) being processed, the design parameters of the cylindrical diamond dressing tool (4) are determined; Determine the working back angle λ of the cylindrical diamond dressing tool (4); Calculate the installation parameters of the cylindrical diamond dressing tool (4), including the axis intersection angle Σ, center distance a, offset distance e and meshing angle κ; Based on the current installation parameters of the cylindrical diamond dressing tool (4), the conjugate surface conjugate with the grinding wheel surface is calculated in the grinding wheel coordinate system; Transform the conjugate surface to the tool coordinate system and cut the end face cutting edge of the cylindrical diamond dressing tool (4) on the conjugate surface; In the 3D modeling software, the end face cutting edge is spirally stretched along the axis according to the tool helix angle to finally obtain the 3D solid model of the cylindrical diamond dressing tool (4).

2. The design method for the cylindrical diamond dressing tool according to claim 1, characterized in that, The design parameters include: number of teeth z t Modulus m n Pressure angle α n Helix angle β t Tooth tip circle diameter da t Root circle diameter df t and displacement coefficient x n2 .

3. The design method for the cylindrical diamond dressing tool according to claim 1, characterized in that, The value range of the working back angle λ is λ∈[5°~15°].

4. The design method of the cylindrical diamond dressing tool according to claim 1, characterized in that, The formula for calculating the axial angle of the cylindrical diamond dressing tool (4) is as follows: ,β w β is the helix angle of the dressed grinding wheel (5). t The helix angle of the cylindrical diamond dressing tool (4).

5. The design method of the cylindrical diamond dressing tool according to claim 1, characterized in that, The formula for calculating the meshing angle κ of the cylindrical diamond dressing tool (4) is as follows: , where λ is the working back angle of the cylindrical diamond dressing tool (4).

6. The design method of the cylindrical diamond dressing tool according to claim 1, characterized in that, The formula for calculating the center distance 'a' of the cylindrical diamond dressing tool (4) is as follows: , among which, da t df is the tip circle diameter of the cylindrical diamond dressing tool (4). w The root circle diameter of the grinding wheel (5) is given.

7. The design method of the cylindrical diamond dressing tool according to claim 1, characterized in that, The formula for calculating the offset distance e of the cylindrical diamond dressing tool (4) is as follows: , among which, da t df is the tip circle diameter of the cylindrical diamond dressing tool (4). w The root circle diameter of the grinding wheel (5) is given.

8. The design method of the cylindrical diamond dressing tool according to claim 1, characterized in that, When the cylindrical diamond dressing tool (4) and the grinding wheel (5) are being dressed, they are fed along the direction of the meshing angle κ. During multiple dressing processes, the radial feed and retraction directions of the cylindrical diamond dressing tool (4) are also executed along the direction of the meshing angle κ.

9. The design method of the cylindrical diamond dressing tool according to claim 1, characterized in that, The cylindrical diamond dressing tool (4) is used as follows: the cylindrical diamond dressing tool (4) is installed at an angle and offset on one side of the symmetrical center line of the grinding wheel (5). The cylindrical diamond dressing tool (4) and the grinding wheel (5) are forced to mesh and rotate synchronously. At the same time, the cylindrical diamond dressing tool (4) feeds along the axis of the grinding wheel (5) to achieve the dressing of the honing grinding wheel (5).

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