Low-vibration high-wear-resistance numerical control machine tool main shaft pull rod

Abstract

This utility model relates to the field of CNC machining technology, specifically to a low-vibration, high-wear-resistant CNC machine tool spindle pull rod. It includes a pull rod body, which comprises a cylindrical rod shaft. From top to bottom, a connecting post, a limiting post, and a locking post are coaxially fixed to the bottom of the rod shaft. The outer diameter of the connecting post is larger than the outer diameter of the rod shaft. A first annular groove is circumferentially formed on the outer wall of the limiting post. A plastic coating layer is hot-pressed into the first annular groove, and the outer side of the plastic coating layer protrudes beyond the first annular groove. The outer diameter of the plastic coating layer is larger than the outer diameter of the connecting post. This utility model's spindle pull rod, by hot-pressing a plastic coating layer within the first annular groove of the limiting post, achieves a flexible connection, reducing pull rod vibration and noise from friction between the pull rod and the spindle core. Furthermore, the hot-pressing of the limiting post and the plastic coating layer reduces deformation of the plastic coating layer, ensuring concentricity between the pull rod and the spindle.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining technology, specifically to a low-vibration, high-wear-resistant CNC machine tool spindle tie rod. Background Technology

[0002] Electric spindles are a new technology that integrates the machine tool spindle and spindle motor in the field of CNC machine tools. An electric spindle usually consists of a housingless motor, spindle, bearings, spindle unit housing, drive module and cooling device, while the tie rod is a key component set in the spindle to hold the tool.

[0003] Electric spindles rotate at high speeds during operation. To position the drawbar, existing technologies typically use sliding sleeves on the drawbar. For example, Chinese invention patent application number 201811542804.9 discloses a dual-winding ball high-speed electric spindle, which includes a body assembly, a motor, a drawbar assembly, a tool changer cylinder, and a claw assembly. The motor, drawbar assembly, and claw assembly are located inside the body assembly. The motor is connected to the drawbar assembly and is a dual-speed dual-winding motor used to drive the drawbar assembly to achieve low-speed or high-speed rotation. One end of the drawbar assembly is connected to the tool changer cylinder, and the other end is connected to the claw assembly, which is used for detachable connection with the tool. After fixing the tie rod, it is difficult to guarantee the cylindricity of the sliding sleeve. During installation or use, it is difficult to ensure that the tie rod is concentric with the spindle. When the tie rod is not concentric with the electric spindle, the vibration generated by the tie rod will be aggravated, increasing the friction with other workpieces and accelerating the wear of the workpieces. At the same time, the heat generated by contact friction is difficult to dissipate quickly, causing the temperature of the tie rod and spindle to rise, greatly reducing the service life of the spindle and affecting the machining accuracy and working reliability. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a low-vibration, high-wear-resistant CNC machine tool spindle tie rod.

[0005] The purpose of this utility model is achieved through the following technical solution: a low-vibration, high-wear-resistant CNC machine tool spindle pull rod, comprising a pull rod body, the pull rod body comprising a cylindrical rod body, a mounting post coaxially fixed at the top of the rod body, the outer side wall of the mounting post having an external thread for screwing into a Latin nut, and the bottom of the rod body having, from top to bottom, a retaining post for abutting a disc spring, a limiting post for ensuring the pull rod body is concentric with the spindle, and a snap-fit ​​post for installing a pull stud tool, the outer diameter of the retaining post being larger than the outer diameter of the rod body, the outer side wall of the limiting post having a first annular groove circumferentially formed, a plastic coating layer being hot-pressed in the first annular groove, the outer side of the plastic coating layer protruding outside the first annular groove, and the outer diameter of the plastic coating layer being larger than the outer diameter of the retaining post.

[0006] Furthermore, the pull rod body has a through hole axially formed in the middle, and both ends of the through hole have flared openings.

[0007] Furthermore, a second annular groove is provided at the connection between the rod body and the mounting post.

[0008] Furthermore, a third annular groove is provided at the connection between the abutment post and the limiting post.

[0009] Furthermore, a fourth annular groove is provided at the connection between the limiting post and the snap-fit ​​post.

[0010] Furthermore, the outer diameter of the snap-fit ​​post gradually decreases from top to bottom.

[0011] Furthermore, a strip-shaped groove is radially formed at the bottom of the snap-fit ​​post.

[0012] Furthermore, the outer side wall of the rod body, excluding the bottom, is provided with an annular groove, and a wear-resistant layer is electroplated inside the annular groove.

[0013] Furthermore, the thickness of the wear-resistant layer is 10-50 μm.

[0014] Furthermore, the thickness of the plastic coating layer is 1.5-2.5 mm.

[0015] The beneficial effects of this utility model are as follows: the main shaft pull rod of this utility model has a plastic coating layer formed by hot pressing in the first annular groove of the limiting post. Through the soft connection, the vibration of the pull rod and the noise of friction between the pull rod and the shaft core can be reduced; and the hot pressing of the limiting post and the plastic coating layer can reduce the deformation of the plastic coating layer and ensure that the pull rod and the main shaft are concentric. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention.

[0017] Figure 2 This is a partial sectional view of the present invention.

[0018] Figure 3 This is a bottom view of the present invention.

[0019] The attached figures are labeled as follows: 1. Rod body; 11. Rod shaft; 111. Second annular groove; 112. Annular side groove; 12. Mounting post; 121. External thread; 13. Abutment post; 13. Third annular groove; 131. Limiting post; 14. First annular groove; 141. Fourth annular groove; 142. Snap-fit ​​post; 15. Strip groove; 151. Plastic coating layer; 16. Through hole; 17. Flared mouth; 171. Wear-resistant layer; 18. Detailed Implementation

[0020] To facilitate understanding by those skilled in the art, the following description is provided in conjunction with embodiments and appendices. Figure 1-3The present invention will be further described below. The content mentioned in the embodiments is not intended to limit the present invention.

[0021] See Figure 1-3 A low-vibration, high-wear-resistant CNC machine tool spindle pull rod includes a pull rod body 1, which includes a cylindrical rod body 11. A mounting post 12 is coaxially fixed to the top of the rod body 11. The outer side wall of the mounting post 12 has an external thread 121 for screwing into a Latin nut. From top to bottom, the bottom of the rod body 11 is coaxially fixed with an abutment post 13 for abutting a butterfly spring, a limiting post 14 for ensuring the pull rod body 1 is concentric with the spindle, and a snap-fit ​​post 15 for installing a pull stud tool. The outer diameter of the abutment post 13 is larger than the outer diameter of the rod body 11. The outer side wall of the limiting post 14 has a first annular groove 141 circumferentially formed. A plastic coating layer 16 is hot-pressed into the first annular groove 141. The outer side of the plastic coating layer 16 protrudes outside the first annular groove 141. The outer diameter of the plastic coating layer 16 is larger than the outer diameter of the abutment post 13.

[0022] The main shaft pull rod of this utility model has a plastic coating layer 16 hot-pressed in the first annular groove 141 of the limiting post 14. Through the flexible connection, the vibration of the pull rod and the noise of friction between the pull rod and the shaft core can be reduced. Moreover, the hot-pressing of the limiting post 14 and the plastic coating layer 16 can reduce the deformation of the plastic coating layer 16 and ensure that the pull rod is concentric with the main shaft.

[0023] In this embodiment, a through hole 17 is axially formed in the middle of the tie rod body 1, and flared openings 171 are formed at both ends of the through hole 17. The above structure reduces the internal stress of the tie rod body 1.

[0024] In this embodiment, a second annular groove 111 is provided at the connection between the rod body 11 and the mounting post 12. The second annular groove 111 can accommodate a shim.

[0025] In this embodiment, a third annular groove 131 is provided at the connection between the abutment post 13 and the limiting post 14. The third annular groove 131 can be used to install a sealing ring.

[0026] In this embodiment, a fourth annular groove 142 is provided at the connection between the limiting post 14 and the locking post 15. The fourth annular groove 142 can be used to install a rivet cutter.

[0027] In this embodiment, the outer diameter of the snap-fit ​​post 15 gradually decreases from top to bottom. This structural design facilitates the installation of the rivet cutter.

[0028] In this embodiment, a strip groove 151 is radially formed at the bottom of the snap-fit ​​post 15. The above structure facilitates the installation of the rivet cutter.

[0029] In this embodiment, the outer side wall of the shaft 11, excluding the bottom, is provided with an annular groove 112, and a wear-resistant layer 18 is electroplated inside the annular groove 112. The shaft 11 can be used to mount a butterfly spring, and by using the wear-resistant layer 18, the lubrication performance and wear resistance of the shaft 11 can be enhanced.

[0030] In this embodiment, the thickness of the wear-resistant layer 18 is 10-50 μm. Specifically, the thickness of the wear-resistant layer 18 can be 10 μm, 20 μm, 30 μm, 40 μm, or 50 μm.

[0031] In this embodiment, the thickness of the plastic coating layer 16 is 1.5-2.5 mm. Specifically, the thickness of the plastic coating layer 16 can be 1.5, 1.8 mm, 2.0 mm, 2.2 mm, or 2.5 mm.

[0032] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this utility model are within the protection scope of this utility model.

Claims

1. A low-vibration, high-wear-resistant CNC machine tool spindle tie rod, comprising a tie rod body, characterized in that: The pull rod body includes a cylindrical rod body, with a mounting post coaxially fixed at the top of the rod body. The outer side wall of the mounting post has an external thread for screwing into a Latin nut. From top to bottom, the bottom of the rod body has a series of coaxially fixed abutment post for abutting a disc spring, a limiting post for ensuring the pull rod body is concentric with the main shaft, and a snap-fit ​​post for installing a pull rivet cutter. The outer diameter of the abutment post is larger than the outer diameter of the rod body. The outer side wall of the limiting post has a first annular groove circumferentially formed. A plastic coating layer is hot-pressed into the first annular groove. The outer side of the plastic coating layer protrudes outside the first annular groove. The outer diameter of the plastic coating layer is larger than the outer diameter of the abutment post.

2. The low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 1, characterized in that: The pull rod body has a through hole axially opened in the middle, and both ends of the through hole have flared openings.

3. The low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 1, characterized in that: A second annular groove is provided at the connection between the rod body and the mounting post.

4. The low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 1, characterized in that: A third annular groove is provided at the connection between the abutment post and the limiting post.

5. A low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 1, characterized in that: A fourth annular groove is provided at the connection between the limiting post and the snap-fit ​​post.

6. The low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 1, characterized in that: The outer diameter of the snap-fit ​​post gradually decreases from top to bottom.

7. The low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 1, characterized in that: The bottom of the snap-fit ​​post has a radially shaped groove.

8. A low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 1, characterized in that: The outer side wall of the rod body, except for the bottom, is provided with an annular groove, and a wear-resistant layer is electroplated inside the annular groove.

9. A low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 8, characterized in that: The thickness of the wear-resistant layer is 10-50 μm.

10. A low-vibration, high-wear-resistant CNC machine tool spindle tie rod according to claim 1, characterized in that: The thickness of the plastic coating layer is 1.5-2.5 mm.

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