Ball screw nut spiral groove machining and milling tool and design method

Abstract

The embodiment of the invention provides a milling cutter for machining a spiral groove of a ball screw nut and a design method. The milling cutter comprises a cutter handle and a circular cutter body. Wherein the knife body is fixedly connected with the knife handle, and the axis of the knife handle coincides with the axis of the knife body; the outer edge of the cutter body is arc-shaped, so that the spiral groove and the outer contour position of the nut can be accurately machined, and the positioning accuracy is high. In addition, the outer edge of the cutter body is in an arc shape, a cross section overcut part is removed, the spiral groove of the ball screw nut can be machined and formed at a time, efficiency is high, and use is more flexible and convenient.

Description

Technical Field

[0001] The present application relates to the technical field of ball screw nut processing, and in particular to a milling tool and a design method for processing spiral grooves of a ball screw nut. Background Art

[0002] Ball screw nut machining typically involves rough turning followed by finishing on a dedicated nut grinder to achieve the desired finish. Milling is used when the nut and base are designed as a single piece or when the spiral groove requires a defined starting position.

[0003] However, when using the milling tool in the prior art for processing, the milling tool may overcut the spiral groove, thereby affecting the quality of the ball screw nut. Summary of the Invention

[0004] The embodiment of the present application provides a milling tool and design method for processing the spiral groove of a ball screw nut, which is used to solve the problem of overcutting during the milling tool processing of the ball screw nut in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a milling tool for machining a spiral groove of a ball screw nut, comprising:

[0006] knife handle;

[0007] A circular blade body, wherein the blade body is fixedly connected to the handle, and the axis of the handle coincides with the axis of the blade body;

[0008] The outer edge of the blade is in an arc shape.

[0009] In a feasible implementation, the blade body is provided with a chip removal groove.

[0010] In a feasible implementation, there are multiple chip removal grooves, and the multiple chip removal grooves are evenly distributed along the outer edge of the blade body.

[0011] In a second aspect, an embodiment of the present application further provides a method for designing a milling tool for processing a spiral groove of a ball screw nut. The method is used to design a milling tool for processing a spiral groove of a ball screw nut as described in the first aspect, comprising:

[0012] Determining the angle between the blade of the tool and the inner hole of the ball screw nut;

[0013] Determine the corresponding value of the helix angle;

[0014] Determine the depth distance value of the spiral groove position of the inner hole diameter of the ball screw nut;

[0015] Determining the distance value of the first point of the blade cross section;

[0016] Changing the angle between the blade and the inner hole of the ball screw nut, and calculating the distance values of multiple points on the cross section of the blade;

[0017] The arc-shaped contour of the outer edge of the blade is fitted according to the distance values of multiple points to complete the design of the blade.

[0018] In a feasible implementation, determining the angle value of the angle between the blade of the tool and the inner hole of the ball screw nut includes:

[0019] The angle value of the angle between the blade and the inner hole of the ball screw nut is determined based on the inner hole diameter of the ball screw nut and the blade diameter.

[0020] In a feasible implementation, determining the corresponding value of the helix angle includes:

[0021] The corresponding value of the helix angle is determined according to the intersection position of the blade and the inner hole of the ball screw nut.

[0022] First, embodiments of the present application provide a milling tool for machining spiral grooves in ball screw nuts, comprising a tool holder and a circular blade. The blade is fixedly connected to the tool holder, with the axis of the tool holder coinciding with the axis of the blade. The blade has an arc-shaped outer edge, enabling precise machining of the nut spiral groove and outer contour with high positioning accuracy. Furthermore, the arc-shaped outer edge of the blade eliminates overcut sections, enabling the ball screw nut spiral groove to be machined and formed in a single operation, resulting in high efficiency, greater flexibility, and greater convenience.

[0023] In the second aspect, an embodiment of the present application also provides a design method for a milling tool for processing spiral grooves of a ball screw nut. The method is used to design a milling tool for processing spiral grooves of a ball screw nut as described in the first aspect. In the method, first, the angle value of the angle between the blade of the tool and the inner hole of the ball screw nut is determined; secondly, the corresponding value of the spiral rise angle is determined; then, the depth distance value of the spiral groove position to the diameter of the inner hole of the ball screw nut is determined; then, the distance value of the first point of the blade cross section is determined; then, the angle value of the angle between the blade and the inner hole of the ball screw nut is changed, and the distance values of multiple points of the blade cross section are calculated; finally, the arc-shaped contour of the outer edge of the blade is fitted according to the distance values of multiple points to complete the design of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present application and do not constitute improper limitations on the present invention.

[0025] In the attached figure:

[0026] Figure 1Schematic diagram of a milling tool for machining spiral grooves in a ball screw nut provided in one embodiment of the present application;

[0027] Figure 2 yes Figure 1 Front view of the milling tool for machining the spiral groove of the ball screw nut;

[0028] Figure 3 yes Figure 1 Bottom view of the milling tool for machining the spiral groove of the ball screw nut;

[0029] Figure 4 yes Figure 3 Cross-sectional view at AA in the middle;

[0030] Figure 5 This is a flow chart of a method for designing a milling tool for machining a spiral groove in a ball screw nut provided in one embodiment of the present application;

[0031] Figure 6 This is a calculation diagram of the design method of a milling tool for machining spiral grooves in a ball screw nut according to a specific embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100-Handle; 200-Blade; 210-Chip Groove. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will provide a clear and complete description of the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0035] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0037] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] Ball screw nut machining typically involves rough turning followed by finishing on a dedicated nut grinder to achieve the desired finish. Milling is used when the nut and base are designed as a single piece or when the spiral groove requires a defined starting position.

[0039] However, when using the milling tool in the prior art for processing, the milling tool may overcut the spiral groove, thereby affecting the quality of the ball screw nut.

[0040] In order to solve the problem of overcutting during the milling tool processing of ball screw nuts in the prior art, an embodiment of the present application provides a milling tool and design method for processing spiral grooves of ball screw nuts. The solution provided by the embodiment of the present application will be described in detail in conjunction with the drawings in the specification.

[0041] Reference Figures 1 to 4 As shown, in a first aspect, an embodiment of the present application provides a milling tool for machining a spiral groove in a ball screw nut, comprising a tool holder and a circular blade. The blade is fixedly connected to the tool holder, and the axis of the tool holder coincides with the axis of the blade. The outer edge of the blade is arc-shaped, which allows for precise machining of the nut spiral groove and outer contour position with high positioning accuracy. Furthermore, the outer edge of the blade is arc-shaped, eliminating overcut sections, allowing the ball screw nut spiral groove to be machined and formed in one step, resulting in high efficiency, greater flexibility, and greater convenience.

[0042] In some examples, the blade body is provided with a chip removal groove to remove cut metal debris, thereby preventing the metal debris from further affecting the blade body's cutting of the ball screw nut spiral groove. In addition, exemplary embodiments include multiple chip removal grooves, each evenly distributed along the outer edge of the blade body, thereby ensuring that metal debris is promptly removed from the ball screw nut hole.

[0043] Figure 5 This is a flow chart of a method for designing a milling tool for processing spiral grooves in a ball screw nut provided in one embodiment of the present application.

[0044] Reference Figure 2 As shown, in a second aspect, embodiments of the present application further provide a method for designing a milling tool for machining a spiral groove in a ball screw nut. The method is used to design the milling tool for machining a spiral groove in a ball screw nut as described in the first aspect, comprising: S100: determining an angle between a blade of the tool and an inner hole of the ball screw nut.

[0045] Exemplarily, the angle value of the angle between the blade and the inner hole of the ball screw nut is calculated and determined based on the inner hole diameter of the ball screw nut and the diameter of the blade.

[0046] S200: Determine the corresponding value of the helix angle.

[0047] Exemplarily, based on the intersection position of the blade and the inner hole of the ball screw nut.

[0048] S300: Determine the depth distance value of the spiral groove position of the inner hole diameter of the ball screw nut;

[0049] Specifically, the depth distance value of the spiral groove position of the ball screw nut inner hole diameter is calculated and determined based on the data calculated in S100 and S200.

[0050] S400: Determine the distance value of the first point of the blade cross section;

[0051] Specifically, the distance value of the first point of the blade cross section is calculated based on the data calculated in S100, S200 and S300.

[0052] S500: changing the angle between the blade and the inner hole of the ball screw nut, and calculating distance values at multiple points on the blade cross section;

[0053] S600: fitting the arc-shaped contour of the outer edge of the blade according to the distance values of the multiple points to complete the design of the blade.

[0054] In order to better illustrate the design method of a milling tool for machining the spiral groove of a ball screw nut, a specific embodiment is provided below.

[0055] In this embodiment, the method calculates the arc profile value of the blade to produce a tool with the profile size, thereby processing the thread groove inside the part with an inner hole diameter of 40 mm.

[0056] Figure 6 This is a calculation diagram of the design method of a milling tool for machining spiral grooves in a ball screw nut according to a specific embodiment of the present application.

[0057] It is known that the inner hole diameter of the part is 40mm, the blade radius is 10mm, the spiral groove corner radius is R2.5, and the pitch is 25mm.

[0058] 1) Calculate the angle A at the intersection of the blade and the inner hole

[0059] AC = inner hole radius + spiral groove radius - tool radius = 20 + 2.5 - 10 = 12.5 mm

[0060]

[0061] ∠A=24.1468°

[0062] 2) Calculate the length of the AB line at the moving point B′

[0063]

[0064] sinB=12.5*sinA / 10=0.511

[0065] ∠B=30.753°

[0066] ∠C=180-∠A-∠B=125.099°

[0067]

[0068] AB=10*sinC / sinA=20mm

[0069] 3) The intersection of the blade and the inner hole, the corresponding value of the helix angle (j)

[0070]

[0071] j = 10 * 24.1468 / 360 = 1.6768

[0072] 4) Calculation of spiral groove position depth distance (k)

[0073]

[0074] 5) Blade cross-section distance value

[0075] Longitudinal distance: CosA*AB=cos24.1468*20=18.25

[0076] Depth distance: kj = 2.5 - 1.6867 = 0.823

[0077] This completes the calculation for one point. Set the angle A as a variable, decreasing it by one value each time until it reaches 0. The finer the segmentation, the more accurate the resulting arc-shaped contour of the blade. Finally, the blade contour is fitted based on the calculated values at each cross-sectional point.

[0078] In order to better illustrate that the tool prepared by the design method of the ball screw nut spiral groove processing milling tool according to the present application has excellent processing effect, a control test of ball screw nut spiral groove processing was carried out using the tool. The following table shows the control test data.

[0079]

[0080] The Φ20 forming tool in the table is a tool prepared using the design method of the ball screw nut spiral groove processing milling tool of this application, and the Φ1.5 arc blade and the Φ2.5 arc blade are both tools in the prior art.

[0081] From the data comparison in the table, it can be seen that the design and use of the forming tool solves the problem of fixed-angle processing of spiral grooves. Compared with turning spiral grooves, it has high processing efficiency and good stability.

[0082] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on the several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0083] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A milling tool for processing spiral grooves of ball screw nuts, characterized in that: include: knife handle; A circular blade body, wherein the blade body is fixedly connected to the handle, and the axis of the handle coincides with the axis of the blade body; The outer edge of the blade is in an arc shape.

2. The ball screw nut spiral groove machining milling tool according to claim 1, characterized in that: The blade body is provided with a chip removal groove.

3. The ball screw nut spiral groove machining milling tool according to claim 2, characterized in that: There are a plurality of chip removal grooves, and the plurality of chip removal grooves are evenly distributed along the outer edge of the blade body.

4. A design method for a milling tool for processing a spiral groove of a ball screw nut, characterized in that: A milling tool for processing a spiral groove of a ball screw nut according to any one of claims 1 to 3 is designed, comprising: Determining the angle between the blade of the tool and the inner hole of the ball screw nut; Determine the corresponding value of the helix angle; Determine the depth distance value of the spiral groove position of the inner hole diameter of the ball screw nut; Determining the distance value of the first point of the blade cross section; Changing the angle between the blade and the inner hole of the ball screw nut, and calculating the distance values of multiple points on the cross section of the blade; The arc-shaped contour of the outer edge of the blade is fitted according to the distance values of multiple points to complete the design of the blade.

5. The method for designing a milling tool for machining a spiral groove of a ball screw nut according to claim 4, characterized in that: Determining the angle value of the angle between the blade of the tool and the inner hole of the ball screw nut includes: The angle value of the angle between the blade body and the inner hole of the ball screw nut is determined based on the diameter of the inner hole of the ball screw nut and the diameter of the blade body.

6. The method for designing a milling tool for machining a spiral groove of a ball screw nut according to claim 4, characterized in that: Determining the corresponding value of the helix angle includes: The corresponding value of the helix angle is determined according to the intersection position of the blade and the inner hole of the ball screw nut.

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