Flat nut base body and lead screw nut

Abstract

The utility model relates to the technical field of lead screw nuts, and particularly discloses a flat plate nut base body and a lead screw nut, the flat plate nut base body comprises a flat plate base body made of metal materials, and a plurality of buckle structures matched with each other are arranged on the two sides of the flat plate base body in the width direction. The upper surface of the flat plate base body is provided with a plurality of thread tooth-shaped structures which are evenly distributed in the length direction, and the thread tooth-shaped structures are arranged in a relatively inclined mode. The screw rod nut is formed by rolling a flat plate nut base body, a convex buckle and a concave buckle on the two sides of the flat plate base body in the width direction are buckled with each other, a thread tooth-shaped structure is spliced to form a complete internal thread, and splicing seams on the two sides of the flat plate base body in the width direction are fixedly connected. Wherein the thread tooth-shaped structure is machined on the flat plate base body, the process difficulty and the process cost are lower, and the production efficiency is higher; the lead screw nut formed through rolling solves the problems of high cost and precision of traditional deep hole thread machining, the production efficiency is improved, and the manufacturing process of the lead screw nut is optimized.

Description

Technical Field

[0001] This utility model relates to the field of lead screw and nut technology, specifically to a flat nut base and a lead screw and nut. Background Technology

[0002] In existing technologies, lead screw nuts are typically manufactured using methods such as turning, tapping, broaching, and grinding. However, with the expanding applications of lead screw nuts, the existing conventional lead screw nut processing methods present numerous problems. Specifically:

[0003] (1) Precision lead screw nuts used in the field of robotics are thin and long, with a length-to-diameter ratio far exceeding that of lead screw nuts in conventional application scenarios. However, the precision requirements are even higher. When machining this type of lead screw nut using traditional methods such as turning, tapping, and broaching, vibration and tool deflection are easily generated due to the rigidity of the tool and chip removal, resulting in a decrease in thread accuracy and thus failing to meet the precision requirements.

[0004] Furthermore, while grinding can improve precision, the space is limited during deep hole machining due to the need for the grinding wheel rod to form a helix angle with the nut axis, making it impossible to effectively grind the full thread. Therefore, traditional lead screw and nut machining methods struggle to produce these slender precision lead screws and nuts that meet the required accuracy.

[0005] (2) Traditional lead screw nuts are processed by removing material. For large-diameter lead screw nuts used in some scenarios, a lot of metal material needs to be removed during the processing, resulting in serious material waste, low material utilization, and high production costs.

[0006] (3) Traditional lead screw and nut processing methods usually require multiple processes (roughing + finishing), resulting in long production cycles and high costs. For example, grinding processing is slow, has high wear on grinding wheels, and requires high-end equipment, which increases the unit cost. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to overcome the technical defects of existing technologies, such as the difficulty in processing slender lead screw nuts, the difficulty in ensuring precision, the low material utilization rate of large-diameter lead screw nuts, and the long production cycle and high cost.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a flat nut base, comprising a flat base made of metal, wherein a plurality of mutually adaptable snap-fit ​​structures are provided on both sides of the flat base in the width direction, and a plurality of thread profile structures evenly distributed along the length direction are provided on the upper surface of the flat base, wherein the thread profile structures are inclined relative to the width direction of the flat base.

[0009] In a preferred embodiment, the thread profile is any one of trapezoidal thread, T-shaped thread, triangular thread, circular arc thread, or rectangular thread.

[0010] In a preferred embodiment, the snap-fit ​​structure includes mutually adaptable convex and concave snaps.

[0011] In a preferred embodiment, each side of the flat substrate in the width direction is provided with a protruding buckle and a recessed buckle.

[0012] This utility model also discloses a rolled lead screw nut, which is rolled from the flat nut base. The protruding and concave buckles on both sides of the flat base in the width direction are interlocked with each other. The thread profile structure is spliced ​​to form a complete internal thread. The splicing seams on both sides of the flat base in the width direction are fixedly connected.

[0013] In a preferred embodiment, the seams are fixedly connected by welding.

[0014] In a preferred embodiment, the internal thread is a single-start thread or a multi-start thread.

[0015] In a preferred embodiment, when the wall thickness / major diameter (T / D) ratio of the lead screw nut is 1 / 12 ≤ T / D < 1 / 6, the helix angle at the thread pitch diameter gradually increases from the thread root to the thread crest.

[0016] In a preferred embodiment, when the wall thickness / major diameter (T / D) ratio of the lead screw nut is T / D≥1 / 12, the cross-section of the flat nut base along the width direction is trapezoidal, and the width of the upper surface of the flat nut base is smaller than the width of the lower surface.

[0017] Compared with the prior art, the flat nut base and lead screw nut of this utility model have the following advantages:

[0018] Compared with traditional processing methods, machining thread profiles on flat substrates is less difficult and less costly, and more efficient.

[0019] (2) The screw nut is formed by rolling a flat nut base, which solves the problems of high cost and precision in traditional deep hole thread processing, improves production efficiency, and optimizes the manufacturing process of screw nuts.

[0020] (3) By setting mutually compatible snap-fit ​​structures on both sides of the flat substrate in the width direction, the self-locking and positioning functions are achieved after the coiling and forming, ensuring that the thread tooth structure is properly connected to form a complete internal thread.

[0021] (4) The snap-fit ​​structure plays a positioning and self-locking role before welding, ensuring the reliability of welding and improving the structural strength of the screw nut and its long-term reliability.

[0022] (5) It is applicable to the processing of screw nuts with different thread profiles and different number of threads, and has a wider range of applications. Attached Figure Description

[0023] Figure 1 This is a top view of the flat nut substrate shown in Embodiment 1.

[0024] Figure 2 This is a schematic diagram of the cross-sectional view of the flat nut base along its length as shown in Example 1.

[0025] Figure 3 This is a schematic diagram of the cross-sectional view of the flat nut base shown in Example 1, cut along the width direction.

[0026] Figure 4 This is a schematic diagram of the structure of a lead screw nut formed by rolling the flat nut substrate shown in Example 1;

[0027] Figure 5 This is a top view of the flat nut substrate shown in Embodiment 2.

[0028] Figure 6 This is a schematic diagram of the structure of a lead screw nut formed by rolling the flat nut substrate shown in Example 2. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] Example 1,

[0033] like Figure 1 , Figure 2 As shown, a flat nut base in this embodiment includes a flat plate base 10 made of metal. The size of the flat plate base is calculated based on the unfolded size of the target lead screw nut, and is not limited in this embodiment.

[0034] In this embodiment, several mutually compatible recessed buckles 12 and protruding buckles 11 are processed on both sides of the flat substrate 10 in the width direction, and the recessed buckles 12 and protruding buckles 11 on both sides form a snap-fit ​​structure.

[0035] Preferably, in this embodiment, each side of the flat substrate 10 in the width direction is provided with a protruding buckle 11 and a recessed buckle 12.

[0036] In this embodiment, the upper surface of the flat plate base 10 is provided with a plurality of thread profile structures 20 evenly distributed along the length direction of the flat plate base 10. The thread profile structures 20 are inclined relative to the width direction of the flat plate base 10, so that after the flat plate nut base of this embodiment is rolled into a cylindrical shape, it can be spliced ​​into a complete internal thread. It should be noted that the aforementioned internal thread can be either a single-start thread or a multi-start thread.

[0037] The structural form of the thread profile structure 20 includes, but is not limited to, any one of trapezoidal thread, T-shaped thread, triangular thread, circular arc thread and rectangular thread, and is not limited in this embodiment.

[0038] The processing method of the thread tooth structure 20 is not limited. It can be processed by any of the existing technologies such as CNC milling, roll forming or laser etching.

[0039] In this embodiment, as described above Figure 1 , Figure 2 The flat nut base shown is rolled into a threaded nut, as shown in the figure. Figure 4 As shown, the concave buckle 12 and the convex buckle 11 interlock to achieve self-locking, thereby ensuring that the thread profile structure engages to form a complete internal thread. The two sides of the flat plate base are fixedly connected at the splice seam in the width direction. Preferably, the splice seam can be fixedly connected by welding.

[0040] It should be noted that in this embodiment, there are no restrictions on the specific shape and number of the recessed buckle 12 and the protruding buckle 11. The technical purpose is that after the recessed buckle 12 and the protruding buckle 11 are interlocked to achieve self-locking, the spliced ​​internal thread will not be misaligned, so that subsequent processes can fix it.

[0041] As a preferred embodiment, in this case, Figure 4 As shown, several of the aforementioned snap-fit ​​structures are arranged along the axial direction of the lead screw nut.

[0042] Preferably, in this embodiment, to ensure the thread accuracy after coiling, different strategies are adopted for processing the thread profile structure for lead screw nuts with different wall thickness / major diameter ratios (T / D). Specifically, when T / D < 1 / 12 (e.g., T / D = 20), the thread profile structure is directly processed on the flat substrate, and the thread deformation caused by material deformation after bending is negligible. When 1 / 12 ≤ T / D < 1 / 6, when processing the thread profile structure 20 on the flat substrate 10, the thread profile structure 20 is modified to ensure that the thread profile structure 20, after material deformation, still meets the accuracy requirements during the subsequent coiling process.

[0043] Specifically, in this embodiment, the method for adjusting the thread profile structure 20 is as follows: Figure 1 As shown, after creating a blank with the thread profile structure on a flat substrate based on the helix angle at the thread pitch diameter, the thread profile is modified so that the helix angle increases towards the thread tip and decreases towards the thread root. Specifically, the helix angle α is smallest at the thread root and largest at the thread tip, with the helix angle gradually increasing from the thread root to the thread tip.

[0044] It should be noted that, due to the different stresses experienced on the inner and outer sides of the flat nut substrate during the rolling process, the thread profile 20 will be compressed and deformed near the inner side, while stretched and deformed near the outer side. This is especially problematic when the wall thickness / major diameter ratio (T / D) is large. Such internal and external stress deformation can negatively impact thread accuracy. In this embodiment, preferably, to reduce the impact of this internal and external stress deformation on thread accuracy, such as… Figure 3 As shown, when the wall thickness / major diameter ratio (T / D) ≥ 1 / 12, the cross-section of the flat nut base along the width direction is trapezoidal, meaning the width of the upper surface of the flat nut base is less than the width of the lower surface. This reasonable distribution of material deformation ensures that the internal thread of the rolled screw nut meets the accuracy requirements.

[0045] Preferably, in this embodiment, laser spot welding or resistance welding is used to... Figure 4 The joint shown is fixed by welding at 30 points. In this embodiment, there are no restrictions on the specific welding method.

[0046] Example 2,

[0047] The flat nut base and the lead screw nut formed by curling the flat nut base in this embodiment are as follows: Figure 5 , Figure 6As shown, the difference from Embodiment 1 is that several of the aforementioned snap-fit ​​structures extend in a helical direction on the lead screw nut. The advantage of this arrangement is that the force is more dispersed, providing better shear resistance and improving the overall rigidity of the lead screw nut housing.

[0048] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flat plate nut base characterized by, The plate base body includes metal material, both sides of the plate base body in width direction are provided with a plurality of mutually matched buckle structures, the upper surface of the plate base body is provided with a plurality of thread tooth type structures arranged along the length direction, and the thread tooth type structures are arranged obliquely relative to the width direction of the plate base body.

2. A flat washer base according to claim 1, wherein The thread tooth type structure is any one of trapezoidal thread, T-shaped thread, triangular thread, circular arc thread and rectangular thread.

3. The flat washer base according to claim 1, wherein The buckle structure includes mutually matched convex buckle and concave buckle.

4. A flat washer base according to claim 3, wherein Each side of the plate base body in width direction is provided with convex buckle and concave buckle.

5. A screw nut, characterized by The plate nut base body is rolled and formed according to any one of claims 1-4, the convex buckle and concave buckle on both sides of the plate base body in width direction are mutually buckled, the thread tooth type structures are spliced to form complete internal thread, and the plate base body in width direction is fixedly connected at the splicing joint.

6. The ball screw as set forth in claim 5, wherein The splicing joint is fixedly connected through welding.

7. The ball screw as set forth in claim 5, wherein The internal thread is single-start thread or multi-start thread.

8. The ball screw as set forth in claim 5, wherein The wall thickness of the screw nut is T, the major diameter is D, the ratio of the wall thickness to the major diameter is 1 / 12 ≤ T / D < 1 / 6, and the helix angle at the pitch diameter of the thread gradually increases from the thread tooth bottom to the thread tooth top.

9. The ball screw as set forth in claim 5, wherein The wall thickness of the screw nut is T, the major diameter is D, the ratio of the wall thickness to the major diameter is T / D ≥ 1 / 12, the cross section of the plate nut base body in the width direction is trapezoidal, and the width of the upper surface of the plate nut base body is smaller than the width of the lower surface.

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