Ball screw for numerical control machine tool

Abstract

The utility model discloses a ball screw for numerical control machine tool, including screw rod part, both sides of screw rod part all are fixedly connected with support pivot, the surface of screw rod part is provided with ball nut seat, the surface of support pivot is rotatably connected with mounting seat through bearing. The utility model discloses set up support pivot and cooperate mounting seat at the both sides of screw rod part, can provide stable support for screw rod part, reduce the shake of working time. The upper semicircular ring piece and the lower semicircular ring piece are attached, cooperate the silica gel sleeve pipe of ball nut seat both sides, can effectively block the invasion of metal scrap, dust and other impurities between the rolling gap, avoid the rolling way to scratch and wear. The setting of transition layer and function layer can significantly improve the corrosion resistance and wear resistance of screw rod part, reduce the erosion of cutting fluid to it, prolong the service life, guarantee the stability of transmission precision, and the device has the advantages of corrosion resistance, wear resistance and dust prevention.

Description

Technical Field

[0001] This utility model relates to the field of ball screw technology, specifically a ball screw for CNC machine tools. Background Technology

[0002] As the core equipment for precision machining, the stability of the transmission system of CNC machine tools directly determines the machining accuracy and equipment lifespan. Ball screws, as a key component of the transmission system, operate in complex machining environments and face multiple performance challenges. During actual machining, impurities such as metal chips, cutting fluid, and dust are continuously generated and diffused, easily penetrating the raceway clearance of the ball screw. Since the transmission of the ball screw relies on the high-precision rolling fit between the balls and the raceway, once debris enters the mating surface, it not only causes scratches and indentations on the raceway surface during relative motion but also exacerbates friction and wear between the balls and the raceway, leading to a gradual decrease in transmission accuracy and even causing malfunctions such as jamming and abnormal noise. In severe cases, machine shutdown for maintenance is necessary, impacting production efficiency. In terms of material properties, existing ball screws mostly use high-strength alloy steel, and their hardness and wear resistance are improved through heat treatment. However, they have significant shortcomings in corrosion resistance. The cutting fluids used in the machining process usually contain chemical components such as emulsifiers and rust inhibitors. Long-term contact can lead to electrochemical corrosion on the surface of the screw shaft and balls, forming rust spots or pits. This not only damages the surface finish but also accelerates the wear process. At the same time, traditional steel is prone to plastic deformation or micro-cracks when subjected to impact and scratches from high-hardness debris. With increasing use, these damages accumulate, ultimately leading to a significant reduction in the service life of the ball screw. Utility Model Content

[0003] To address the problems mentioned in the background art, the purpose of this utility model is to provide a ball screw for CNC machine tools that has the advantages of corrosion resistance, wear resistance, and dust and debris prevention.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a ball screw for CNC machine tools, comprising a screw section, with supporting shafts fixedly connected to both sides of the screw section, a ball nut seat provided on the surface of the screw section, and a mounting seat rotatably connected to the surface of the supporting shafts via bearings. An upper semi-circular ring and a lower semi-circular ring are fixedly connected to the side of the mounting seat near the screw section by bolts, the upper semi-circular ring and the lower semi-circular ring being in contact, silicone sleeves provided on both sides of the ball nut seat, a transition layer provided on the surface of the screw section, and a functional layer provided on the surface of the transition layer.

[0005] As a preferred embodiment of this utility model, both sides of the silicone sleeve are fixedly connected with mounting rings, and the mounting ring on the side away from the ball nut seat is fixedly connected to the upper semi-circular ring and the lower semi-circular ring by bolts, and the mounting ring on the side closer to the ball nut seat is fixedly connected to the ball nut seat by bolts.

[0006] In a preferred embodiment of this invention, a plurality of sleeves evenly distributed in a ring are fixedly connected to the side of the mounting base near the ball nut seat. A movable rod is slidably connected inside the sleeve. The movable rod is fixedly connected to the ball nut seat on the side near the ball nut seat. Both the sleeve and the movable rod are located inside the silicone sleeve.

[0007] As a preferred embodiment of this invention, the surface of the sleeve is fixedly connected with a reinforcing frame, and the number of reinforcing frames is several.

[0008] As a preferred embodiment of the present invention, the surface of the ball nut seat is provided with a first mounting port, and the number of the first mounting ports is several; the surface of the mounting seat is provided with a second mounting port, and the number of the second mounting ports is several.

[0009] As a preferred embodiment of this invention, the lead screw is made of high-strength alloy steel, the transition layer is a nickel-based tungsten carbide composite coating, and nano-sized ceramic particles are uniformly distributed in the coating, and the functional layer is a DLC coating.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model employs supporting shafts on both sides of the lead screw section, along with mounting bases, to provide stable support for the lead screw section and reduce shaking during operation. The upper and lower semi-circular ring plates fit together, and together with the silicone sleeves on both sides of the ball nut seat, effectively prevent metal shavings, dust, and other impurities from entering the raceway gap, avoiding scratches and wear on the raceway. The transition layer and functional layer significantly improve the corrosion and wear resistance of the lead screw section, reduce the erosion of cutting fluids, extend its service life, and ensure the stability of transmission accuracy. This device has the advantages of corrosion resistance, wear resistance, and dust and debris prevention.

[0011] 2. This utility model uses a silicone sleeve that is fixedly connected to the upper semi-circular ring, lower semi-circular ring, and ball nut seat via mounting rings on both sides. This connection method ensures that the silicone sleeve remains stable during the movement of the ball nut seat, preventing loosening or displacement. This allows the silicone sleeve to reliably provide continuous protection, effectively preventing impurities from entering the lead screw. Simultaneously, the silicone material has a certain degree of elasticity, which does not affect the normal movement of the ball nut seat, ensuring a balance between protective performance and operational flexibility. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front sectional view of the silicone sleeve structure of this utility model; Figure 3 This is a schematic diagram of the sleeve and movable rod structure of this utility model; Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0013] In the diagram: 1. Lead screw section; 2. Support shaft; 3. Ball bearing nut seat; 4. Mounting seat; 5. Silicone sleeve; 6. Upper semi-circular ring; 7. Lower semi-circular ring; 8. Mounting ring; 9. Sleeve; 10. Movable rod; 11. Reinforcing frame; 12. First mounting port; 13. Second mounting port. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figures 1 to 4 As shown, a ball screw for a CNC machine tool includes a screw section 1, with a support shaft 2 fixedly connected to both sides of the screw section 1. A ball nut seat 3 is provided on the surface of the screw section 1. A mounting seat 4 is rotatably connected to the surface of the support shaft 2 via a bearing. An upper semi-circular ring 6 and a lower semi-circular ring 7 are fixedly connected to the side of the mounting seat 4 near the screw section 1 by bolts. The upper semi-circular ring 6 and the lower semi-circular ring 7 are in contact. Silicone sleeves 5 are provided on both sides of the ball nut seat 3. A transition layer is provided on the surface of the screw section 1, and a functional layer is provided on the surface of the transition layer. The ball nut seat 3, the screw section 1, and the mounting seat 4 are all existing common technologies and are common knowledge to those skilled in the art. They will not be described in detail in this application.

[0016] refer to Figure 4 Both sides of the silicone sleeve 5 are fixedly connected with mounting rings 8. The mounting ring 8 on the side away from the ball nut seat 3 is fixedly connected to the upper semi-circular ring 6 and the lower semi-circular ring 7 by bolts, and the mounting ring 8 on the side closer to the ball nut seat 3 is fixedly connected to the ball nut seat 3 by bolts.

[0017] As a technical optimization of this utility model, the silicone sleeve 5 is fixedly connected to the upper semicircular ring 6, the lower semicircular ring 7, and the ball nut seat 3 via mounting rings 8 on both sides. This connection method ensures that the silicone sleeve 5 remains stable during the movement of the ball nut seat 3, without loosening or displacement. This allows the silicone sleeve 5 to continuously and reliably perform its protective function, effectively preventing impurities from entering the lead screw section 1. Simultaneously, the silicone material has a certain degree of elasticity, which does not affect the normal movement of the ball nut seat 3, ensuring a balance between protective performance and movement flexibility.

[0018] refer to Figure 3 The mounting base 4 is fixedly connected to a plurality of sleeves 9 evenly distributed in a ring on the side near the ball nut seat 3. The sleeves 9 are slidably connected to a movable rod 10. The movable rod 10 is fixedly connected to the ball nut seat 3 on the side near the ball nut seat 3. Both the sleeves 9 and the movable rod 10 are located inside the silicone sleeve 5.

[0019] As a technical optimization of this utility model, the sliding engagement between the sleeve 9 on the mounting base 4 and the movable rod 10 connected to the ball nut seat 3 provides guidance for the movement of the ball nut seat 3, reducing its radial wobble during movement and improving the smoothness and accuracy of the transmission. Furthermore, the sleeve 9 and the movable rod 10 are located inside the silicone sleeve 5, preventing the silicone sleeve 5 from contacting the lead screw 1, thus preventing the silicone sleeve 5 from getting stuck in the threaded groove of the lead screw 1 and affecting its normal operation.

[0020] refer to Figure 3 The surface of the sleeve 9 is fixedly connected with a reinforcing frame 11, and there are several reinforcing frames 11.

[0021] As a technical optimization of this utility model, multiple sleeves 9 are connected into a whole by reinforcing frames 11 on the surface of the sleeve 9, which can significantly improve the overall strength and rigidity of the sleeve 9 structure and prevent individual sleeves 9 from deforming or being damaged under stress. This structural design enhances the support stability of the sleeve 9 on the movable rod 10, ensuring that the matching accuracy between the sleeve 9 and the movable rod 10 is not affected during long-term high-frequency movement, and improving the overall durability of the device.

[0022] refer to Figure 1 The surface of the ball nut seat 3 is provided with a first mounting port 12, and the number of first mounting ports 12 is several. The surface of the mounting seat 4 is provided with a second mounting port 13, and the number of second mounting ports 13 is several.

[0023] As a technical optimization of this utility model, the first mounting port 12 of the ball nut seat 3 and the second mounting port 13 of the mounting base 4 provide convenient interfaces for connecting the device with other components. Operators can quickly fix the device to other components through these mounting ports according to actual installation needs, simplifying the assembly process and improving installation efficiency. At the same time, the multiple mounting ports also increase installation flexibility and can adapt to different machine tool assembly scenarios.

[0024] refer to Figure 2 The lead screw part 1 is made of high-strength alloy steel, the transition layer is a nickel-based tungsten carbide composite coating, and nano-sized ceramic particles are uniformly distributed in the coating. The functional layer is a DLC coating.

[0025] As a technical optimization of this utility model, the lead screw section 1 is made of high-strength alloy steel, ensuring sufficient strength and rigidity of the overall structure to withstand the large loads during CNC machine tool operation. The transition layer uses a nickel-based tungsten carbide composite coating containing nano-sized ceramic particles, which significantly improves surface hardness and wear resistance, enhancing resistance to impacts and scratches from high-hardness debris. The functional layer is a DLC coating, which further improves surface lubricity and corrosion resistance, reduces friction and wear, prevents rust, and comprehensively improves the service life and working performance of the lead screw section 1.

[0026] The working principle and usage process of this utility model are as follows: When using this ball screw for CNC machine tools, firstly, the mounting base 4 needs to be fixed to the corresponding position of the CNC machine tool through the second mounting port 13 on its surface. During the fixing process, it is necessary to ensure that the mounting base 4 is stable to avoid shaking during subsequent use and affecting the overall running accuracy. After installing the mounting base 4, check the bearing connection between the support shafts 2 on both sides of the screw part 1 and the mounting base 4 to ensure that the support shafts 2 can rotate flexibly in the mounting base 4 without any jamming. This is the basis for ensuring the normal operation of the screw part 1. The mounting rings 8 on both sides of the silicone sleeve 5 are fixedly connected to the upper semi-circular ring 6, the lower semi-circular ring 7, and the ball nut seat 3, respectively. When connecting, it is necessary to ensure that each connection point is firm so that the silicone sleeve 5 can effectively block metal chips, dust, and other impurities. At the same time, it is important to note that the installation of the silicone sleeve 5 should not affect the normal movement of the ball nut seat 3 on the screw part 1. Next, check the movable rod 10 connecting the sleeve 9 on the mounting base 4 and the ball nut seat 3 to ensure that the movable rod 10 can slide smoothly inside the sleeve 9. The reinforcing frame 11 on the surface of the sleeve 9 should firmly connect multiple sleeves 9 into a whole to ensure that the sleeve 9 supports the movable rod 10 stably, provide reliable guidance for the movement of the ball nut seat 3, and reduce radial sway during the movement.

[0027] After completing the above installation, perform overall debugging by moving the ball nut seat 3 on the lead screw section 1 and observing whether its movement is smooth and without abnormal noise. Simultaneously check whether the silicone sleeve 5 moves synchronously with the ball nut seat 3 and maintains good protective condition. The transition layer and functional layer on the surface of the lead screw section 1 should be undamaged to ensure its normal corrosion resistance and wear resistance. During daily use, regularly check the condition of each component, checking for damage to the silicone sleeve 5, loosening of the mounting ring 8 connection, and smooth engagement between the sleeve 9 and the movable rod 10. Address any problems promptly to ensure the long-term stable operation of the ball screw and maintain the machining accuracy and efficiency of the CNC machine tool.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ball screw for CNC machine tools, comprising a screw section (1), characterized in that: Both sides of the lead screw (1) are fixedly connected to a support shaft (2). A ball nut seat (3) is provided on the surface of the lead screw (1). A mounting seat (4) is rotatably connected to the surface of the support shaft (2) through a bearing. An upper semi-circular ring (6) and a lower semi-circular ring (7) are fixedly connected to the side of the mounting seat (4) near the lead screw (1) by bolts. The upper semi-circular ring (6) and the lower semi-circular ring (7) are in contact. Silicone sleeves (5) are provided on both sides of the ball nut seat (3). A transition layer is provided on the surface of the lead screw (1). A functional layer is provided on the surface of the transition layer.

2. The ball screw for CNC machine tools according to claim 1, characterized in that: Both sides of the silicone sleeve (5) are fixedly connected with mounting rings (8), and the mounting ring (8) on the side away from the ball nut seat (3) is fixedly connected to the upper semi-circular ring (6) and the lower semi-circular ring (7) by bolts, and the mounting ring (8) on the side close to the ball nut seat (3) is fixedly connected to the ball nut seat (3) by bolts.

3. The ball screw for CNC machine tools according to claim 1, characterized in that: The mounting base (4) has a plurality of sleeves (9) evenly distributed in a ring on the side near the ball nut seat (3). The sleeves (9) have a movable rod (10) slidably connected inside. The movable rod (10) is fixedly connected to the ball nut seat (3) on the side near the ball nut seat (3). The sleeves (9) and the movable rod (10) are both located inside the silicone sleeve (5).

4. A ball screw for CNC machine tools according to claim 3, characterized in that: The sleeve (9) is fixedly connected to a reinforcing frame (11), and the number of reinforcing frames (11) is several.

5. A ball screw for CNC machine tools according to claim 1, characterized in that: The surface of the ball nut seat (3) is provided with a first mounting port (12), and the number of the first mounting ports (12) is several. The surface of the mounting seat (4) is provided with a second mounting port (13), and the number of the second mounting ports (13) is several.

6. A ball screw for CNC machine tools according to claim 1, characterized in that: The lead screw (1) is made of high-strength alloy steel, the transition layer is a nickel-based tungsten carbide composite coating, and nano-sized ceramic particles are uniformly distributed in the coating. The functional layer is a DLC coating.

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