Ball screw nut continuous punching device

Abstract

The utility model discloses a ball screw nut continuous stamping equipment, including a plurality of stamping stations, each stamping station is equipped for the different steering groove of forming position in nut blank inner wall. Each stamping station includes upper die, movable plate and respectively slide and install first half slide block and second half slide block on movable plate, and two slide blocks can move along the direction of each other close or far, and set the convex part for forming steering groove on its outer wall. Movable plate can move relative to upper die, and the bottom of upper die is equipped with cam part, and cam part can insert the gap between two slide blocks and push two slide blocks to the outside, make its convex part and nut blank inner wall contact and stamping form steering groove. The utility model provides a ball screw nut continuous stamping equipment, through each station only sets up a pair of slide blocks and realizes controlled and synchronous radial motion by cam part, improves slide block strength and life in limited space, and forms multiple steering grooves with continuous stamping mode.

Description

Technical Field

[0001] This utility model relates to the field of ball screw nut processing technology, and more specifically, to a continuous stamping equipment for ball screw nuts. Background Technology

[0002] Ball screw assemblies, as precision transmission mechanisms, are widely used in machine tools, automated equipment, and high-precision positioning systems. In existing technologies, to achieve a closed-loop circulation path for the balls within the nut, a helical ball groove is typically formed on the inner wall of the nut, and a steering mechanism is installed inside the ball groove to allow the balls to rotate along the circulation path. For example, CN107923501A discloses a ball screw structure in which the nut has at least one internal ball groove, and at least one radially closed groove is introduced into the ball groove to accommodate a steering element for guiding the balls that have traveled to that location onto the return path. Furthermore, this patented solution typically requires multiple steering elements spaced at intervals along the helical direction on the inner wall of the nut to ensure the continuity and stability of the ball circulation.

[0003] To manufacture ball screw nuts with the aforementioned structure, a common industry practice is to pre-form the steering element on the nut blank before performing subsequent helical ball groove finishing. Common pre-forming methods include stamping, extrusion, or localized plastic deformation. When using stamping to prepare multiple steering elements, it is usually necessary to simultaneously form multiple radial recesses on the inner wall of the nut blank. This type of process often relies on the simultaneous outward movement of multiple sliders to upset the recesses.

[0004] However, due to the limited inner diameter of the nut blank, the more sliders there are to accommodate multiple radially movable sliders, the more the wall thickness of each slider is compressed, leading to a decrease in strength and durability, making it difficult to withstand repeated impact loads. In addition, multi-slider structures are prone to uneven stress, accelerated wear, and shortened lifespan when space is limited, affecting the consistency of steering element forming and processing stability. Summary of the Invention

[0005] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, the embodiments of this utility model propose a continuous stamping equipment for ball screw nuts. By setting only pairs of sliders at each station and achieving controlled and synchronous radial movement by cam components, the strength and life of the sliders are improved within a limited space. Multiple steering grooves are stably formed by continuous stamping. At the same time, a compact layout and stable cycle time are achieved by relying on a unified modular structure, thereby improving processing efficiency and reducing maintenance costs.

[0006] The technical solution adopted by this utility model is as follows: a continuous stamping equipment for ball screw nuts is provided, which includes multiple stamping stations, each stamping station being configured to form a turning groove at a different position on the inner wall of the nut blank. Each stamping station includes an upper die, a movable plate, and a first half-slider and a second half-slider respectively slidably mounted on the movable plate. The two sliders can move in a direction that approaches or moves away from each other, and have protrusions on their outer peripheral walls for forming the turning grooves. The movable plate can move relative to the upper die, and a cam is provided at the bottom of the upper die. The cam can be inserted into the gap between the two sliders and push the two sliders outward, so that their protrusions contact the inner wall of the nut blank and are stamped to form the turning groove.

[0007] This invention employs a pair of first and second half-slider blocks in each stamping station. The two blocks are driven outward by a longitudinally reciprocating cam at the bottom of the upper die, ensuring controlled and highly synchronized radial displacement of the blocks. This allows for the stable formation of turning grooves on the inner wall of the nut blank. By using only two half-slider blocks within a limited space, the wall thickness of the blocks is significantly increased, enhancing structural strength and service life. Multiple turning grooves are formed sequentially through continuous stamping, balancing processing efficiency and forming quality. Furthermore, the use of a unified structural module across multiple stations ensures a more stable multi-point processing rhythm, a more compact overall equipment layout, and higher reliability. This improves production efficiency and reduces maintenance costs, effectively solving the technical problem of insufficient slider life in the prior art.

[0008] According to one embodiment of the present invention, one end of a guide rod is fixedly connected to one of the movable plate and the upper mold, while the other end is slidably engaged with the other end of the guide rod. This structure provides precise linear motion guidance for the movable plate, ensuring smooth movement of the movable plate towards or away from the upper mold.

[0009] According to one embodiment of the present invention, one or two pushing devices are provided on the movable plate for driving the first half-slider and / or the second half-slider with the protrusions to move inward. Since the protrusions on the slider are more likely to stick to the turning groove of the nut blank after molding, which can easily lead to difficulty in demolding the slider, the pushing device can actively push the half-slider to effectively reduce the adhesion resistance and improve the smoothness of demolding.

[0010] According to one embodiment of the present invention, the stamping station further includes a lower die, in which the nut blank is embedded in a placement groove of the lower die. This structure can stably limit the nut blank, ensuring that its outer periphery is subjected to uniform force during stamping, preventing the blank from shifting or tilting, thereby ensuring the forming position and dimensional accuracy of the turning groove.

[0011] According to one embodiment of the present invention, a limiting sleeve is slidably installed on the lower mold. During molding, the lower ends of the two half-slider blocks can be inserted through the opening at the upper end of the limiting sleeve. During demolding, the limiting sleeve is pushed to move towards the placement groove, so that the two sliders move inward synchronously. With the help of the linkage and guiding function of the limiting sleeve, reliable synchronous inward movement can be achieved during the slider reset process, reducing jamming and improving the consistency of action; at the same time, the action of the limiting sleeve works in coordination with the push-pull device, and the lower and upper ends of the sliders can provide auxiliary demolding force at the same time, making the demolding process smoother and more reliable.

[0012] According to one embodiment of the present invention, the limiting sleeve is connected to a push rod, which is used to push the limiting sleeve to move towards the placement groove. The push rod can provide a stable driving force, making the reset action of the limiting sleeve reliable and further improving the controllability of the slider reset.

[0013] According to one embodiment of the present invention, the outer periphery of the first half-slider is provided with a first outer guide surface, and the upper opening of the limiting sleeve is provided with an inner guide surface. The two slide in contact to drive the first half-slider to move inward. This guiding fit can form a stable oblique guide when the limiting sleeve moves, so that the first slider moves inward smoothly and is not prone to wobble.

[0014] According to one embodiment of the present invention, a second outer guide surface is provided on the outer periphery of the second half-slider, and the second outer guide surface slides in contact with the inner guide surface to drive the second half-slider to move inward. This design forms the same guiding pattern as the aforementioned first slider, ensuring that the inward movement of the two sliders is consistent and improving structural coordination.

[0015] According to one embodiment of the present invention, the inner wall of the first half-slider is provided with a first sliding groove, which slides vertically with the cam component. This sliding groove engagement enhances the guiding effect between the slider and the cam component, making the cam pushing process more stable and the positioning more accurate.

[0016] According to one embodiment of the present invention, the inner wall of the second half-slider is provided with a second sliding groove, which slides vertically with the cam component. This same guiding engagement ensures smooth movement of the second slider when driven by the cam, further guaranteeing the consistency of the steering groove formation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the stamping equipment in the present invention during mold opening.

[0019] Figure 2 This is a cross-sectional view of the stamping equipment in the embodiment of this utility model when the mold is closed.

[0020] Figure 3 This is a perspective view of the stamping equipment in the embodiment of this utility model.

[0021] Figure 4 This is a perspective view of the lower mold in an embodiment of this utility model.

[0022] Figure 5 This is a perspective view of the splitter slider and cam component in an embodiment of this utility model.

[0023] Figure 6 This is an exploded view of the splitter and cam component in an embodiment of this utility model.

[0024] Explanation of the labels in the diagram: 1. Upper mold; 2. Movable plate; 3. First half-slider; 4. Second half-slider; 5. Pushing device; 6. Cam component; 7. Lower mold; 8. Nut blank; 9. Limiting sleeve; 10. Push rod; 11. Guide rod; 31. First groove; 32. First outer guide surface; 41. Protrusion; 42. Second groove; 43. Second outer guide surface; 81. Placement slot; 91. Inner guide surface. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example 1

[0026] like Figure 1-6 As shown, this embodiment provides a continuous stamping equipment for ball screw nuts. The equipment includes five stamping stations arranged sequentially along the processing direction. Each stamping station is used to form a turning groove at a different position on the inner circumferential direction of the nut blank 8. The nut blank 8 is a hollow cylindrical bushing structure, which moves sequentially between the stations to achieve continuous stamping forming of multiple turning grooves.

[0027] Specifically, in combination Figure 1-2As shown, each stamping station includes an upper die 1, a movable plate 2, a first half-slider 3, and a second half-slider 4. The first half-slider 3 and the second half-slider 4 are slidably mounted on the movable plate 2, and move in a radial direction that moves closer to or further away from each other. The first half-slider 3 and the second half-slider 4 are arranged symmetrically on the movable plate 2, and a protrusion 41 for stamping a turning groove is provided on the outer peripheral wall of the first half-slider 3. The shape of the protrusion 41 can be set to an S-shape according to the requirements of the turning groove, for local plastic deformation of the inner wall of the nut blank 8.

[0028] Combination Figure 5 As shown, the movable plate 2 can move vertically relative to the upper mold 1. The bottom of the upper mold 1 is provided with a cam 6 for driving the two half-slider blocks to separate or close, and the cam 6 is located between the first half-slider 3 and the second half-slider 4. The cam 6 is a longitudinally arranged flat long rod structure, its length being greater than the length of the two half-slider blocks, allowing it to be inserted into the gap between the two sliders when the upper mold 1 moves downwards. The side of the cam 6 forms a cam surface that gradually expands outwards from top to bottom, used to push the first half-slider 3 and the second half-slider 4 radially outwards when the upper mold 1 continues to move downwards, causing its protrusion 41 to press against the inner wall of the nut blank 8 and be stamped to form a turning groove.

[0029] Specifically, in combination Figure 1-2 As shown, during mold closing, the first half-slider 3 and the second half-slider 4, under the action of the pusher device 5, are initially in a close-to-each-other closing state, and the first half-slider 3 and the second half-slider 4 are inserted into the inner cavity of the nut blank 8 as a whole. As the upper mold 1 continues to move downward, the lower end of the movable plate 2 abuts against the lower mold 7 and remains in the same position, while the upper mold 1 continues to move downward relative to the movable plate 2, causing the cam 6 to enter between the two sliders. The gradually increasing outward expansion dimension of the cam surface forces the two sliders to move towards the side wall of the nut blank 8, and the protrusion 41 on the outer periphery of the slider contacts the inner wall of the nut blank 8 and upsets the turning groove. After forming is completed, the nut blank 8 is conveyed to the next stamping station, and the forming process is repeated at different circumferential positions until the multiple turning grooves required for the ball screw nut are formed. The adjacent arrangement of multiple stations can reduce the transfer stroke and improve the stability of the continuous processing rhythm.

[0030] Specifically, in combination Figure 1 As shown, one end of the guide rod 11 is fixedly connected to the movable plate 2 and the upper die 1, while the other end is slidably engaged with the other end of the guide rod 11. The guide rod 11 is a long columnar structure used to provide stable guidance for the vertical linear movement of the movable plate 2, so that the movable plate 2 maintains a stable posture as it approaches or moves away from the upper die 1, avoiding tilting or deviation, and ensuring the coaxiality accuracy of the stamping process.

[0031] Furthermore, such as Figure 5-6As shown, a pusher device 5 is provided on the movable plate 2 to drive the first half-slider 3 with the protrusion 41 to move inward. The pusher device 5 can be a spring assembly, cylinder or wedge block mechanism, and is installed on the inner side of the movable plate 2. After the slider is stamped, the protrusion 41 and the groove formed by the nut blank 8 are prone to adhesion, making it difficult for the slider to return to its original position. By applying force to push the slider inward by the pusher device 5, the adhesion force can be effectively overcome, allowing the slider to return to its original position smoothly, preparing for the next mold closing.

[0032] Furthermore, such as Figure 2 As shown, each stamping station also includes a lower die 7, and the nut blank 8 is embedded in the placement groove 81 of the lower die 7. The placement groove 81 of the lower die 7 is an annular groove structure that matches the outer diameter of the nut blank 8, which is used to support and position the nut blank 8, so that it maintains a balanced force on the outer circumference during the stamping process, prevents the blank from shifting, and thus ensures the forming position and shape accuracy of the turning groove.

[0033] Furthermore, a limiting sleeve 9 is slidably installed on the lower mold 7, located at the lower part of the placement groove 81. During the molding stage, the lower ends of the two half-slider blocks are inserted into the nut blank 8 through the upper opening of the limiting sleeve 9; during the demolding stage, the two sliders move inward synchronously by pushing the limiting sleeve 9 towards the placement groove 81. The limiting sleeve 9 is an annular sleeve with an inner guide surface 91 at its upper opening, which can radially guide the outer periphery of the first half-slider 3 and the second half-slider 4. When the limiting sleeve 9 moves upward, the first half-slider 3 and the second half-slider 4 are forced to converge inward synchronously, which helps to improve the consistency of slider reset and avoid local jamming, while also providing bidirectional auxiliary force for demolding in conjunction with the ejector device 5.

[0034] Furthermore, the limiting sleeve 9 is connected to a push rod 10, which can push the limiting sleeve 9 to move closer to the placement groove 81. The push rod 10 can be a rigid rod, fixedly connected to the limiting sleeve 9, and driven by an external drive mechanism to ensure the reliability of the movement of the limiting sleeve 9 during the reset process, thereby making the movement within the slider stable and controllable.

[0035] Furthermore, such as Figure 5-6As shown, the first half-slider 3 has a first outer guide surface 32 on its outer periphery, and the upper opening of the limiting sleeve 9 has an inner guide surface 91, which indirectly slides in contact to drive the first half-slider 3 to move inward. The first outer guide surface 32 is usually set as an inclined surface, which cooperates with the inclined surface of the inner guide surface 91 of the limiting sleeve 9 to provide stable oblique guidance when the limiting sleeve 9 rises, so that the first half-slider 3 maintains a stable posture during inward movement. Similarly, the second half-slider 4 has a second outer guide surface 43 on its outer periphery, which slides in contact with the inner guide surface 91 of the limiting sleeve 9, thereby driving the second half-slider 4 to move inward. This structure has the same function as the first outer guide surface 32 on the first slider, so that the first half-slider 3 and the second half-slider 4 are synchronously reset under the drive of the limiting sleeve 9, avoiding structural interference or jamming caused by inconsistent actions.

[0036] Furthermore, the inner wall of the first half-slider 3 is provided with a first sliding groove 31, which slides vertically with the cam component 6. The first sliding groove 31 serves to limit and guide the cam component 6, ensuring that the cam component 6 maintains the correct engagement position with the slider during its up-and-down movement, thus enhancing the stability of the cam drive process. Similarly, the inner wall of the second half-slider 4 is provided with a second sliding groove 42, which also slides vertically with the cam component 6.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A continuous stamping equipment for ball screw nuts, characterized in that: It includes multiple stamping stations, each configured to form a turning groove at a different position on the inner wall of the nut blank; each stamping station includes an upper die, a movable plate, a first half-slider, and a second half-slider, the first half-slider and the second half-slider being slidable on the movable plate in a direction that approaches or moves away from each other; the outer peripheral walls of the first half-slider and / or the second half-slider are provided with protrusions for forming the turning groove; the movable plate is capable of moving relative to the upper die in a direction that approaches or moves away from each other; a cam is provided at the bottom of the upper die, the cam being able to insert into the gap between the first half-slider and the second half-slider, and drive the first half-slider and the second half-slider to move outward, so as to stamp the turning groove on the inner wall of the nut blank.

2. The continuous stamping equipment for ball screw nuts according to claim 1, characterized in that: The movable plate is fixedly connected to one end of the guide rod of the upper mold, and the other is slidably engaged with the other end of the guide rod.

3. The continuous stamping equipment for ball screw nuts according to claim 1, characterized in that: The movable plate is provided with one or two pushing devices, which are used to drive the first half slider and / or the second half slider with the protrusion to move inward.

4. The continuous stamping equipment for ball screw nuts according to claim 1, characterized in that: The stamping station also includes a lower die, and the nut blank is embedded in the placement groove of the lower die.

5. The continuous stamping equipment for ball screw nuts according to claim 4, characterized in that: A limiting sleeve is slidably installed on the lower mold. The limiting sleeve is located at the lower part of the placement groove. During molding, the lower ends of the first half-slider and the second half-slider are inserted through the upper opening of the limiting sleeve. During demolding, the limiting sleeve is pushed to move towards the placement groove, thereby causing the two half-sliders to move inward synchronously.

6. The continuous stamping equipment for ball screw nuts according to claim 5, characterized in that: The limiting sleeve is connected to a top rod, which is used to push the limiting sleeve to move closer to the placement slot.

7. The continuous stamping equipment for ball screw nuts according to claim 5, characterized in that: The first half-slider has a first outer guide surface on its outer periphery, and the upper opening of the limiting sleeve has an inner guide surface. The first outer guide surface slides in contact with the inner guide surface to drive the first half-slider to move inward.

8. The continuous stamping equipment for ball screw nuts according to claim 7, characterized in that: The second half slider has a second outer guide surface on its outer periphery, which slides in contact with the inner guide surface to drive the second half slider to move inward.

9. The continuous stamping equipment for ball screw nuts according to claim 1, characterized in that: The inner wall of the first half-slider is provided with a first sliding groove, which is vertically slidingly engaged with the cam component.

10. A continuous stamping equipment for ball screw nuts according to claim 1, characterized in that: The inner wall of the second half slider is provided with a second sliding groove, which slides vertically with the cam component.

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