A servo positioning mechanism for a thread rolling machine

Abstract

This utility model discloses a follower positioning mechanism for a thread rolling machine, comprising: a workpiece positioning sleeve for fixing the shaft workpiece to be processed; a waist-shaped cavity in which the workpiece positioning sleeve is slidably disposed and can move laterally; a follower ejector pin located on the side of the waist-shaped cavity near the fixed wheel of the thread rolling machine, with its first end able to pass through the side of the waist-shaped cavity and maintain contact with the workpiece positioning sleeve; and a follower elastic element, with one end fixed and the other end disposed near the second end of the follower ejector pin. Thus, the follower ejector pin and the follower elastic element can automatically adjust the position of the workpiece positioning sleeve in the waist-shaped cavity according to the extrusion depth of the shaft thread, effectively eliminating more than 99% of the lateral force when the thread rolling machine processes shaft threads, solving the problem of thread tilting caused by lateral force, significantly improving the coaxiality and processing accuracy of the thread, and increasing the automation level and production efficiency of the processing.

Description

Technical Field

[0001] This utility model relates to the field of thread processing technology for shaft parts, and in particular to a follow-up positioning mechanism for a thread rolling machine. Background Technology

[0002] In the field of mechanical manufacturing, thread rolling machines are commonly used equipment for machining threads on shaft parts. The thread is formed by the mutual compression of the fixed and moving rollers of the thread rolling machine. However, in actual machining, when the moving roller moves towards the fixed roller to compress the thread, the thread center slightly shifts towards the fixed roller. The resulting lateral force easily causes the machined thread to tilt, severely affecting the coaxiality of the thread and product quality. To ensure the machining accuracy of threads on shaft parts, traditional methods often involve improving the manufacturing precision of the equipment or manual correction. This is time-consuming, labor-intensive, costly, and has limited effectiveness, failing to fundamentally eliminate the impact of lateral force on thread machining.

[0003] Therefore, there is an urgent need for a positioning mechanism that can effectively eliminate lateral forces in order to solve the above problems. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a follow-up positioning mechanism for a thread rolling machine.

[0005] This utility model proposes a follow-up positioning mechanism for a thread rolling machine, comprising:

[0006] Workpiece positioning sleeve, the inside of which is used to fix the shaft-type workpiece being machined;

[0007] The workpiece positioning sleeve is slidably disposed within the waist-shaped cavity and is capable of moving laterally within the waist-shaped cavity;

[0008] The follower pin is located on the side of the waist-shaped cavity near the fixed wheel of the thread rolling machine, and its first end can pass through the side of the waist-shaped cavity to maintain contact with the workpiece positioning sleeve;

[0009] The follower elastic element has one end fixed and the other end positioned near the second end of the follower pin.

[0010] Preferably, it also includes a fixed seat, the waist-shaped cavity is formed on the fixed seat, and a support bearing is provided between the workpiece positioning sleeve and the waist-shaped cavity.

[0011] Preferably, the follower elastic element is a follower spring.

[0012] Preferably, the follower pin and the follower spring are provided with a fixing sleeve, and one end of the follower spring is fixed to the inner wall of the fixing sleeve.

[0013] Preferably, the follower spring is configured as a parallel disc spring group.

[0014] Preferably, the end of the follower pin that contacts the workpiece positioning sleeve is designed as a hemispherical structure.

[0015] In summary, this utility model has the following beneficial effects: the follower pin and follower elastic element can automatically adjust the position of the workpiece positioning sleeve in the waist-shaped cavity according to the extrusion depth of the shaft thread, without manual intervention, realizing adaptive adjustment during the processing; it can effectively eliminate more than 99% of the lateral force when the thread rolling machine processes the shaft thread, fundamentally solving the problem of thread tilting caused by lateral force, significantly improving the coaxiality and processing accuracy of the thread, meeting the processing requirements of high-precision mechanical parts, and improving the automation level and production efficiency of the processing.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a perspective view of the follow-up positioning mechanism for a thread rolling machine according to an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of the follow-up positioning mechanism for a thread rolling machine according to an embodiment of the present invention.

[0019] In the picture:

[0020] 1. Workpiece positioning sleeve; 2. Waist-shaped cavity; 3. Follower ejector pin; 4. Follower spring; 5. Fixed seat; 6. Support bearing; 7. Fixed sleeve; 8. Fixed wheel; 9. Moving wheel. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols 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.

[0022] like Figure 1-2 As shown in this embodiment, a follower positioning mechanism for a thread rolling machine includes:

[0023] Workpiece positioning sleeve 1, the inside of which is used to fix the shaft-type workpiece being machined;

[0024] The workpiece positioning sleeve 1 is slidably disposed in the waist-shaped cavity 2 and can move laterally within the waist-shaped cavity 2;

[0025] The follower ejector pin 3 is located on the side of the waist-shaped cavity 2 near the fixed wheel 8 of the thread rolling machine, and its first end can pass through the side of the waist-shaped cavity 2 to maintain contact with the workpiece positioning sleeve 1.

[0026] The follower elastic element is fixed at one end and set at the second end near the follower pin 3 at the other end.

[0027] Specifically, the follower elastic element is set as follower spring 4, and follower spring 4 is set as a parallel disc spring group with a stiffness coefficient of 5-8 N / mm.

[0028] Thus, by using the follower pin 3 and follower elastic element, the position of the workpiece positioning sleeve 1 in the waist-shaped cavity 2 can be automatically adjusted according to the extrusion depth of the shaft thread, thereby driving the adjustment of the position of the shaft workpiece without manual intervention, realizing adaptive adjustment during the processing; it can effectively eliminate more than 99% of the lateral force when the thread rolling machine processes the shaft thread, fundamentally solving the problem of thread tilting caused by lateral force, significantly improving the coaxiality and processing accuracy of the thread, meeting the processing requirements of high-precision mechanical parts, and improving the automation level and production efficiency of the processing.

[0029] Furthermore, it also includes a fixed seat 5, with the waist-shaped cavity 2 formed on the fixed seat 5, and a support bearing 6 is provided between the workpiece positioning sleeve 1 and the waist-shaped cavity 2. The sliding friction of the workpiece positioning sleeve 1 in the waist-shaped cavity 2 is converted into rolling friction. The coefficient of rolling friction is much smaller than the coefficient of sliding friction. This makes the lateral movement of the workpiece positioning sleeve 1 under the action of the follower pin 3 and the follower spring 4 smoother. It can automatically adjust its position more quickly and sensitively according to the thread extrusion depth, effectively eliminate lateral force, and avoid the situation where the adjustment lag is caused by excessive frictional resistance, which affects the coaxiality of the thread.

[0030] Furthermore, the end of the follower pin 3 that contacts the workpiece positioning sleeve 1 is designed as a hemispherical structure. This reduces the contact area, thereby reducing friction and wear; the hemispherical end transforms the contact stress from the concentrated load of the planar pin into Hertzian contact stress, preventing stress concentration from causing crushing of the workpiece positioning sleeve 1 surface; and improves contact stability.

[0031] In summary, during use, first, the shaft-like part to be processed is installed and fixed inside the workpiece positioning sleeve 1. Then, the follower mechanism is installed in the corresponding position on the thread rolling machine, so that the follower pin 3 contacts the appropriate part of the shaft-like workpiece. When the thread rolling machine starts running, the fixed wheel 8 and the moving wheel 9 of the thread rolling machine begin to rotate. At the same time, the moving wheel 9 moves towards the fixed wheel 8, pressing the shaft thread towards the fixed wheel 8. During the pressing process, the shaft-like workpiece drives the workpiece positioning sleeve 1 to move laterally within the waist-shaped cavity 2. At this time, the follower pin 3 and the follower spring 4 begin to function. The follower pin 3 moves with the change in the pressing depth of the shaft thread, pushing the follower spring 4 to compress or extend. The reaction force generated by the follower spring 4 is fed back to the workpiece positioning sleeve 1 through the follower pin 3, so that it automatically adjusts its position according to the pressing depth of the shaft thread, thus counteracting the lateral force on the shaft. Throughout the entire machining process, the follow-up mechanism operates continuously, monitoring and adjusting in real time to ensure the shaft remains in the correct machining position. This follow-up mechanism eliminates over 99% of the lateral forces acting on shaft-type workpieces during machining, leaving only the force of the follower spring 4, which is relatively small and negligible. This effectively prevents thread tilting and ensures thread coaxiality. After machining the threads of a shaft-type part, a new part can be replaced, and machining can continue. The follow-up mechanism functions stably and efficiently, guaranteeing machining quality and efficiency.

[0032] It should be understood that the terms "center," "longitudinal," "lateral," "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.

[0033] 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.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] 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 with the second feature 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.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A follow-up positioning mechanism for a thread rolling machine, characterized in that, include: Workpiece positioning sleeve, the inside of which is used to fix the shaft-type workpiece being machined; The workpiece positioning sleeve is slidably disposed within the waist-shaped cavity and is capable of moving laterally within the waist-shaped cavity; The follower pin is located on the side of the waist-shaped cavity near the fixed wheel of the thread rolling machine, and its first end can pass through the side of the waist-shaped cavity to maintain contact with the workpiece positioning sleeve; The follower elastic element has one end fixed and the other end positioned near the second end of the follower pin.

2. The follow-up positioning mechanism for a thread rolling machine according to claim 1, characterized in that, It also includes a fixed seat, the waist-shaped cavity is formed on the fixed seat, and a support bearing is provided between the workpiece positioning sleeve and the waist-shaped cavity.

3. The follow-up positioning mechanism for a thread rolling machine according to claim 1, characterized in that, The follower elastic element is set as a follower spring.

4. The follow-up positioning mechanism for a thread rolling machine according to claim 3, characterized in that, The follower pin and the follower spring are provided with a fixing sleeve, and one end of the follower spring is fixed to the inner wall of the fixing sleeve.

5. The follow-up positioning mechanism for a thread rolling machine according to claim 4, characterized in that, The follower spring is configured as a parallel disc spring group.

6. The follow-up positioning mechanism for a thread rolling machine according to claim 1, characterized in that, The end of the follower pin that contacts the workpiece positioning sleeve is designed with a hemispherical structure.

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