Thread rolling plate assembly for thread rolling forming of round tail screw, control method, equipment and medium

Abstract

The invention discloses a thread rolling plate assembly for thread rolling forming of round tail screws, a control method, equipment and a medium, the thread rolling plate assembly comprises a static thread rolling plate and a dynamic thread rolling plate which are matched with each other, and the opposite sides of the static thread rolling plate and the dynamic thread rolling plate are sequentially provided with a thread rolling face, a receding groove and a closing part in the direction perpendicular to the thread rolling direction; a thread rolling area is formed between the thread rolling surfaces of the static thread rolling plate and the dynamic thread rolling plate and is used for performing thread rolling treatment on a screw rod part of a screw blank; the receding grooves of the static thread rolling plate and the dynamic thread rolling plate are located in the tail position of a screw blank, the receding grooves of the static thread rolling plate and the dynamic thread rolling plate are closed to form a forming area, and the forming area is hemispherical and used for containing extrusion materials generated during thread rolling of the screw blank and forming a round tail. And the closed part of the static thread rolling plate and the dynamic thread rolling plate is used for sealing the forming area. Threads and round tails are formed synchronously in one thread rolling procedure, the production efficiency of round tail screws can be improved, and the overall machining cost can be reduced.

Description

Technical Field

[0001] This application relates to the field of screw processing technology, and in particular to a thread rolling plate assembly, control method, equipment and medium for forming thread rolling of round-tailed screws. Background Technology

[0002] In the field of screw processing, thread rolling plates are commonly used components for forming the thread of the screw shank. They are mainly composed of static and dynamic thread rolling plates working together to achieve thread processing. The core relies on the extrusion principle of metal plastic deformation. When the dynamic thread rolling plate reciprocates, it drives the screw blank to roll between the two plates. The metal material of the blank shank is filled into the tooth valley of the thread rolling plate under the extrusion force, thereby forming a matching thread structure in the screw shank. This extrusion forming process causes the screw shank to undergo plastic elongation. Therefore, after the thread rolling process is completed, it is usually necessary to cut off the excess extruded material at the tail of the screw. If a round-tail screw is to be processed, the tail of the screw must be machined into a hemispherical round-tail structure after cutting.

[0003] In the existing technology, when processing round-tail screws, thread rolling and rounding are two independent processes. The thread rolling of the screw shank must be completed first, and then the screw tail is processed to form a round tail through a subsequent turning process. The step-by-step operation of the two processes lengthens the overall processing flow of round-tail screws and makes the processing process more complicated, which directly leads to low production efficiency of round-tail screws and cannot meet the needs of large-scale production. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a thread rolling plate assembly, control method, equipment and medium for forming round-tailed screws, which can improve the production efficiency of round-tailed screws and reduce the overall processing cost.

[0005] In a first aspect, this application provides a thread rolling plate assembly for forming thread rolling of round tail screws, comprising: a static thread rolling plate and a dynamic thread rolling plate that cooperate with each other, wherein the opposite sides of the static thread rolling plate and the dynamic thread rolling plate are provided with a thread rolling surface, a clearance groove and a closing part in sequence perpendicular to the thread rolling direction; A thread rolling area is formed between the thread rolling surfaces of the static thread rolling plate and the dynamic thread rolling plate, which is used to perform thread rolling on the screw part of the screw blank. The thread geometry parameters of the thread rolling surfaces of the two are the same and the spatial installation directions are mirror images of each other. The clearance grooves of the static thread rolling plate and the dynamic thread rolling plate are located at the tail of the screw blank. The clearance grooves of the two plates close to form a forming area. The forming area is hemispherical and is used to accommodate the extruded material generated by the screw blank during thread rolling and to form a round tail. The closing portion of the static and dynamic tooth-rolling plates is used to seal the forming area.

[0006] According to the first aspect of this application, the thread rolling plate assembly for forming round-tail screws has at least the following beneficial effects: The thread rolling plate assembly for forming round-tail screws consists of a static thread rolling plate and a dynamic thread rolling plate that cooperate to process round-tail screws. The thread rolling surface, clearance groove, and closing part arranged sequentially on opposite sides of the two are in a corresponding fit. A thread rolling area is formed between the thread rolling surfaces of the static thread rolling plate and the dynamic thread rolling plate, which extrudes and rolls the screw part of the screw blank. The screw part forms a thread by relying on the principle of metal plastic deformation. The extruded material generated during the thread rolling process will naturally extend to the hemispherical forming area formed by the closure of the clearance grooves on both sides. The closing parts of the static thread rolling plate and the dynamic thread rolling plate are in contact with each other, which can effectively limit the extension direction of the extruded material and allow the extruded material to be shaped in the hemispherical forming area, thereby directly forming a round tail at the tail of the screw blank, realizing the integrated processing of screw thread rolling and tail round tail forming. In existing technologies, machining round-tail screws requires first using a thread rolling plate to roll the screw threads, and then machining the extruded material at the tail into a hemispherical round tail through a turning process. This step-by-step machining method results in low production efficiency and high processing costs. However, this thread rolling plate assembly eliminates the subsequent turning process by using the synergistic effect of the thread rolling surface, the hemispherical forming area, and the closing part. It simultaneously completes the forming of the thread and the round tail in one thread rolling process. Furthermore, the limiting effect of the closing part on the extruded material ensures the hemispherical forming effect of the round tail. This simplifies the machining process of round-tail screws, improves the production efficiency of round-tail screws, reduces the cost of process steps, and lowers the overall processing cost.

[0007] According to some embodiments of the first aspect of this application, the tooth ridges on the tooth rubbing surface change from shallow to deep from the beginning to the end.

[0008] According to some embodiments of the first aspect of this application, the void-avoiding groove is provided with a discharge trough at the end position, and the size of the discharge trough is larger than the size of the void-avoiding groove.

[0009] Secondly, this application also provides a control method for forming the thread rolling of round-tailed screws, applied to a thread rolling plate assembly for forming the thread rolling of round-tailed screws as described in any embodiment of the first aspect, the control method comprising: The screw blank is placed into the beginning of the thread rolling area formed between the thread rolling surfaces of the static thread rolling plate and the dynamic thread rolling plate, and the dynamic thread rolling plate is controlled to move a preset first stroke at a preset first speed. The dynamic tooth-rolling board is controlled to increase from the first speed to a preset second speed, and moves at the second speed for a preset second stroke; The dynamic thread rolling plate is controlled to decrease from the second speed to a preset third speed, and moves at the third speed for a preset third stroke, and outputs the finished screw with threads and rounded tail from the end of the thread rolling area; The dynamic thread rolling plate is controlled to retract to the initial position and wait for the next screw blank to be placed in.

[0010] The control method for forming round-tail screws according to the first and second aspects of this application has at least the following beneficial effects: During processing, the screw blank is first placed at the beginning of the forming area formed by the forming surfaces of the static forming plate and the dynamic forming plate. The dynamic forming plate moves at a first speed for a first stroke, allowing the screw rod of the screw blank to initially enter the forming area and the tail to gradually embed into the hemispherical forming area formed by the closure of the clearance grooves on both sides, thus completing the precise positioning and initial extrusion of the blank. Then, it is moved to a second speed for a second stroke to perform core forming extrusion on the screw rod, so that the metal material fully fills the thread of the forming surface to form a thread. At the same time, the extruded material generated by forming is shaped into a round tail in the forming area under the limitation of the closed part. Then, it is moved to a third speed for a third stroke, allowing the formed screw product to be smoothly output from the end of the forming area through the discharge channel at the end of the clearance groove. Finally, the dynamic forming plate retracts and resets to wait for the next blank. This segmented speed control logic is adapted to the processing state of the screw blank in different areas of the thread rolling plate assembly. The low feeding speed can avoid the blank positioning misalignment and collision between the tail and the forming area entrance. The high core thread rolling speed can ensure the forming efficiency and quality of the thread and the round tail. The low discharge speed can prevent the finished round tail from getting stuck in the clearance groove and avoid damage to the thread or round tail due to excessive discharge speed. The overall segmented speed control is coordinated with the thread rolling area, forming area and closing structure of the thread rolling plate assembly to realize the integrated forming processing of the screw thread and the round tail. This not only ensures the forming accuracy of the round tail screw, but also avoids the problems of material jamming and component damage during the processing, improves the processing continuity and production efficiency. At the same time, it adapts to the structural characteristics of integrated forming, eliminates the need for subsequent turning processes, and further reduces processing costs.

[0011] According to some embodiments of the second aspect of this application, it also includes: During the movement of the dynamic tooth rolling plate, the extrusion force between the static tooth rolling plate and the dynamic tooth rolling plate is acquired in real time; When the extrusion pressure is less than the preset pressure threshold, the dynamic tooth rolling plate is controlled to increase the feed thrust and maintain the current moving speed. When the extrusion pressure exceeds the pressure threshold, the dynamic tooth-rolling board is controlled to reduce its moving speed and retract a preset distance.

[0012] According to some embodiments of the second aspect of this application, after the step of outputting the finished screw with threads and rounded tail from the end of the thread-rolling area, the method further includes: Obtain the appearance image data of the finished screw after processing; The appearance image data is preprocessed by contour extraction and feature enhancement to obtain characteristic image information; The parameter analysis of the characterized image information yields the defect detection results of the screw, the measured value of the arc of the rounded tail, and the measured value of the thickness. The defect detection results are compared with the defect-free preset standard, and the measured values ​​of the arc and the thickness are compared with the corresponding preset tolerance ranges to obtain the image quality inspection results. Based on the image quality inspection results, the finished screws that are deemed unqualified by the image quality inspection results are rejected.

[0013] According to some embodiments of the second aspect of this application, after the step of outputting the finished screw with threads and rounded tail from the end of the thread-rolling area, the method further includes: Several screws were randomly selected from the finished screws as quality inspection samples. Radial shear force is gradually applied to the toothed area of ​​the quality inspection sample, and circumferential torque is gradually applied to the joint between the toothed area and the screw, until the quality inspection sample shows a failure state of toothed deformation, stripping, or breakage, and the force value change data during the force application process is acquired in real time. The force value change data is processed by strength conversion calculation to obtain the shear strength value of the thread and the forming bond strength value between the thread and the screw. The shear strength value and molding bond strength value are compared with the corresponding preset performance standard values ​​to obtain the physical performance quality inspection results. If the physical performance quality inspection results show that the proportion of unqualified samples reaches a preset ratio, the moving speed and / or feed thrust of the dynamic tooth rolling plate are adjusted according to the strength difference of the physical performance quality inspection results.

[0014] According to some embodiments of the second aspect of this application, the first speed is 30% to 40% of the second speed, and the third speed is 70% to 80% of the second speed.

[0015] Thirdly, this application also provides an electronic device, including: At least one memory; At least one processor; At least one program; The program is stored in the memory, and the processor executes at least one of the programs to implement the control method for forming the thread roll of a round-tailed screw as described in any embodiment of the second aspect.

[0016] Fourthly, this application provides a computer-readable storage medium storing a computer-executable program for performing the control method for forming round-tailed screw threads as described in any embodiment of the second aspect.

[0017] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0018] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which: Figure 1 This is a schematic diagram of the thread rolling plate assembly (including the screw) for thread rolling of round-tailed screws provided in this application; Figure 2 This is a schematic diagram of the thread rolling plate assembly (with screw removed) for thread rolling of round-tailed screws provided in this application; Figure 3 A flowchart of the control method for forming the thread roll of the round tail screw provided in this application.

[0019] The attached icons are numbered as follows: Static thread rolling plate 101; Dynamic thread rolling plate 102; Thread rolling surface 110; Thread rolling area 111; Clear groove 120; Forming area 121; Closure part 130; Finished screw 200; Round tail 210. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these 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 application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, 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 application 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 application.

[0022] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0023] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0024] In the field of screw processing, thread rolling plates are commonly used components for forming the thread of the screw shank. They are mainly composed of static and dynamic thread rolling plates working together to achieve thread processing. The core relies on the extrusion principle of metal plastic deformation. When the dynamic thread rolling plate reciprocates, it drives the screw blank to roll between the two plates. The metal material of the blank shank is filled into the tooth valley of the thread rolling plate under the extrusion force, thereby forming a matching thread structure in the screw shank. This extrusion forming process causes the screw shank to undergo plastic elongation. Therefore, after the thread rolling process is completed, it is usually necessary to cut off the excess extruded material at the tail of the screw. If a round-tail screw is to be processed, the tail of the screw must be machined into a hemispherical round-tail structure after cutting.

[0025] In the existing technology, when processing round-tail screws, thread rolling and rounding are two independent processes. The thread rolling of the screw shank must be completed first, and then the screw tail is processed to form a round tail through a subsequent turning process. The step-by-step operation of the two processes lengthens the overall processing flow of round-tail screws and makes the processing process more complicated, which directly leads to low production efficiency of round-tail screws and cannot meet the needs of large-scale production.

[0026] Based on this, this application provides a thread rolling plate assembly, control method, equipment and medium for forming threaded round-tailed screws to solve the above-mentioned technical problems. The technical solutions provided by this application will be described in detail below.

[0027] Firstly, referring to Figure 1 and Figure 2 This application provides a thread rolling plate assembly for forming threaded round-tailed screws, comprising: a static thread rolling plate 101 and a dynamic thread rolling plate 102 that cooperate with each other. On opposite sides of the static thread rolling plate 101 and the dynamic thread rolling plate 102, thread rolling surfaces 110, clearance grooves 120, and closing portions 130 are sequentially provided perpendicular to the thread rolling direction. A thread rolling area 111 is formed between the thread rolling surfaces 110 of the static thread rolling plate 101 and the dynamic thread rolling plate 102 for thread rolling the screw portion of the screw blank. The thread geometry parameters of the thread rolling surfaces 110 are the same, and their spatial installation directions are mirror images of each other; the clearance grooves 120 of the static thread rolling plate 101 and the dynamic thread rolling plate 102 are located at the tail of the screw blank, and the clearance grooves 120 of the two are closed to form a forming area 121. The forming area 121 is hemispherical and is used to accommodate the extruded material generated by the screw blank during thread rolling and to form a round tail 210; the closed part 130 of the static thread rolling plate 101 and the dynamic thread rolling plate 102 is used to seal the forming area 121.

[0028] The thread rolling plate assembly for forming round-tail screws consists of a static thread rolling plate 101 and a dynamic thread rolling plate 102 that work together to process the round-tail screw. The thread rolling surface 110, clearance groove 120, and closing part 130 on opposite sides of the two are in a corresponding and fitted state. A thread rolling area 111 is formed between the thread rolling surfaces 110 of the static thread rolling plate 101 and the dynamic thread rolling plate 102, which compresses and rolls the screw part of the screw blank. The screw part forms a thread by relying on the principle of metal plastic deformation. The extruded material generated during the thread rolling process will naturally extend into the hemispherical forming area 121 formed by the closing of the clearance grooves 120 on both sides. The closing parts 130 of the static thread rolling plate 101 and the dynamic thread rolling plate 102 are in contact with each other, which can effectively limit the extension direction of the extruded material and allow the extruded material to be shaped in the hemispherical forming area 121, thereby directly forming a round tail 210 at the tail of the screw blank, realizing the integrated processing of screw thread rolling and tail round tail 210 forming. In the existing technology, the processing of round-tail screws requires first using a thread rolling plate to roll the screw threads, and then using a turning process to process the extruded material at the tail into a hemispherical round tail 210. This step-by-step processing method results in low production efficiency and high processing costs. However, this thread rolling plate assembly, through the synergistic effect of the thread rolling surface 110, the hemispherical forming area 121, and the closing part 130, eliminates the subsequent turning process. The thread and the round tail 210 are formed simultaneously in one thread rolling process. Furthermore, the limiting effect of the closing part 130 on the extruded material ensures the hemispherical forming effect of the round tail 210. This simplifies the processing flow of round-tail screws, improves the production efficiency of round-tail screws, reduces the cost consumption caused by process steps, and lowers the overall processing cost.

[0029] It should be noted that the aforementioned tooth pattern geometric parameters may include tooth pitch, tooth profile angle, and tooth height. Tooth pitch represents the axial distance between the cusps (or valleys) of two adjacent tooth patterns, tooth profile angle represents the angle between the two lateral surfaces of the tooth pattern, and tooth height represents the vertical distance from the cusp to the valley of the tooth pattern. The above is only an enumeration of some parameters in the tooth pattern geometric parameters, and this application does not impose specific limitations on them.

[0030] Understandably, the thread depth of the thread-rolling surface 110 changes from shallow to deep from the beginning to the end. The screw portion of the screw blank undergoes gradual extrusion and plastic deformation during the thread-rolling process, rather than being subjected to instantaneous full-depth extrusion. This effectively avoids forming defects such as tooth tip cracking and material tearing caused by instantaneous strong extrusion, ensuring the integrity and forming accuracy of the thread profile. On the other hand, the gradual extrusion method reduces instantaneous impact and friction loss between the thread-rolling plate and the screw blank, reducing the risk of chipping and wear on the thread-rolling plate and extending its service life. Simultaneously, the smooth deformation process allows the metal material to fill the thread grooves more smoothly, resulting in a fuller final thread profile and further ensuring the locking performance and structural strength of the screw thread.

[0031] Understandably, the clearance groove 120 has a discharge groove at the end, and the size of the discharge groove is larger than that of the clearance groove 120. This provides a wider discharge channel for the formed round tail screw, and avoids the round tail 210 from getting stuck or rubbing due to being too tightly attached to the inner wall of the clearance groove 120. This ensures that the finished screw 200 can smoothly leave the thread rolling plate assembly, and prevents processing interruption, damage to the screw round tail 210 or the thread caused by jamming.

[0032] Secondly, referring to Figure 3 This application also provides a control method for forming round-tailed screw threads, applied to the thread rolling plate assembly for forming round-tailed screw threads provided in any embodiment of the first aspect. The control method includes, but is not limited to, the following steps: Step S110: Place the screw blank into the beginning of the thread rolling area formed between the thread rolling surfaces of the static thread rolling plate and the dynamic thread rolling plate, and control the dynamic thread rolling plate to move a preset first stroke at a preset first speed.

[0033] Step S120: Control the dynamic tooth-rolling plate to increase from the first speed to the preset second speed, and move the preset second stroke at the second speed.

[0034] Step S130: Control the dynamic thread rolling plate to decrease from the second speed to the preset third speed, move the preset third stroke at the third speed, and output the finished screw with threads and rounded tail from the end of the thread rolling area.

[0035] Step S140: Control the dynamic thread rolling plate to retract to the initial position and wait for the next screw blank to be placed.

[0036] In steps S110 to S140, during processing, the screw blank is first placed at the beginning of the thread rolling area formed by the thread rolling surfaces of the static thread rolling plate and the dynamic thread rolling plate. The dynamic thread rolling plate moves at a first speed for a first stroke, allowing the screw of the blank to initially enter the thread rolling area and the tail to gradually embed into the hemispherical forming area formed by the closing of the clearance grooves on both sides, completing the precise positioning and initial extrusion of the blank. Then, it moves to a second speed for a second stroke, performing core thread rolling extrusion on the screw, so that the metal material fully fills the thread grooves on the thread rolling surface to form a thread. At the same time, the extruded material generated by thread rolling is shaped into a round tail in the forming area under the limitation of the closed part. Then, it moves to a third speed for a third stroke, allowing the finished screw to be smoothly output from the end of the thread rolling area through the discharge channel at the clearance groove end. Finally, the dynamic thread rolling plate retracts and resets to wait for the next blank. This segmented speed control logic is adapted to the processing state of the screw blank in different areas of the thread rolling plate assembly. The low feeding speed can prevent the blank from being misaligned, the high core thread rolling speed can ensure the forming efficiency and quality of the thread and the rounded tail, and the low discharge speed can prevent the finished rounded tail from getting stuck in the clearance groove and prevent the thread or the rounded tail from being pulled and damaged due to excessive discharge. The overall segmented speed control is coordinated with the thread rolling area, forming area and closing structure of the thread rolling plate assembly, realizing the integrated forming processing of the screw thread and the rounded tail. This not only ensures the forming accuracy of the rounded tail screw, but also avoids the problems of material jamming and component damage during the processing, improves the processing continuity and production efficiency, and at the same time, adapts to the structural characteristics of integrated forming, eliminating the need for subsequent turning processes and further reducing processing costs.

[0037] It should be noted that before step S110, the tail of the screw blank can be pre-processed, for example, by cutting an arc-shaped chamfer at the tail of the screw blank, so as to make it easier to form a hemispherical round tail at the tail of the screw blank in the subsequent thread rolling.

[0038] It is understood that the control method for thread rolling of round-tailed screws provided in this application may also include, but is not limited to, the following steps: Step S210: During the movement of the dynamic tooth rolling plate, the extrusion force between the static tooth rolling plate and the dynamic tooth rolling plate is acquired in real time.

[0039] Step S220: When the extrusion pressure is less than the preset pressure threshold, control the dynamic tooth rolling plate to increase the feed thrust and maintain the current moving speed.

[0040] Step S230: When the extrusion pressure is greater than the pressure threshold, control the dynamic tooth-rolling plate to reduce its moving speed and retract a preset distance.

[0041] In steps S210 to S230, on the one hand, increasing the feed thrust and maintaining the speed when the extrusion pressure is below the threshold ensures that the metal material in the screw part is fully extruded and filled into the thread groove of the thread rolling surface. At the same time, it allows the extruded material generated by thread rolling to extend sufficiently and evenly to the hemispherical forming area, ensuring the fullness of the thread profile and the forming accuracy of the rounded tail, and avoiding problems such as incomplete thread forming, rounded tail curvature, or substandard dimensions due to insufficient extrusion pressure. On the other hand, reducing the speed and retracting a preset distance when the extrusion pressure is above the threshold can promptly alleviate the impact of excessive extrusion pressure on the thread rolling plate assembly, preventing the thread rolling surface, clearance groove, or closing part of the static thread rolling plate and dynamic thread rolling plate from cracking or wearing due to overload, effectively extending the service life of the thread rolling plate assembly, and preventing defects such as screw deformation and thread tip cracking caused by excessive extrusion of the screw blank. Real-time control of the extrusion pressure throughout the process creates dynamic pressure compensation and overload protection, ensuring that the pressure of the thread rolling process always matches the forming requirements. This reduces processing interruptions and scrapped products caused by abnormal pressure, improves the processing stability and finished product qualification rate of the integrated thread rolling forming of round tail screws, and ensures the continuity of production.

[0042] It is understood that after step S130, the following steps may be included, but are not limited to: Step S310: Obtain the appearance image data of the finished screw after processing.

[0043] Step S320: Perform contour extraction and feature enhancement preprocessing on the appearance image data to obtain characteristic image information.

[0044] Step S330: Perform parameter analysis on the feature image information to obtain the defect detection results of the screw, the measured value of the arc of the rounded tail, and the measured value of the thickness.

[0045] Step S340: Compare the defect detection results with the defect-free preset standard, and compare the measured values ​​of curvature and thickness with the corresponding preset tolerance ranges to obtain the image quality inspection results.

[0046] Step S350: Based on the image quality inspection results, reject the finished screw products whose image quality inspection results are unqualified.

[0047] In steps S310 to S350, image acquisition, preprocessing, and parameter analysis can accurately and quantitatively detect whether the screw has defects such as breakage or missing material. At the same time, the key forming dimensions such as the curvature and thickness of the rounded tail are accurately verified. Compared with manual inspection, this greatly improves the accuracy and objectivity of quality inspection, effectively prevents unqualified products from flowing into subsequent stages, reduces the failure rate of subsequent processing, and improves the overall production yield and processing stability.

[0048] It is understood that after step S130, the following steps may be included, but are not limited to: Step S410: Randomly select a number of screws from the finished products as quality inspection samples.

[0049] Step S420: Gradually apply radial shear force to the threaded portion of the quality inspection sample and gradually apply circumferential torque to the joint between the thread and the screw until the quality inspection sample exhibits thread deformation, stripping, or breakage failure, and acquire force value change data in real time during the force application process.

[0050] Step S430: Perform strength conversion calculation on the force value change data to obtain the shear strength value of the thread and the forming bond strength value between the thread and the screw.

[0051] Step S440: Compare the shear strength value and molding bond strength value with the corresponding preset performance standard values ​​to obtain the physical performance quality inspection results.

[0052] Step S450: If the physical performance quality inspection results show that the proportion of unqualified samples reaches the preset proportion, adjust the moving speed and / or feed thrust of the dynamic tooth rolling plate according to the strength difference of the physical performance quality inspection results.

[0053] In steps S410 to S450, quality inspection samples are randomly selected from the finished screws using a random sampling method. Force is gradually applied until the sample fails, accurately capturing the changes in the actual force values ​​of the thread shear resistance and the torsional resistance of the thread-to-screw connection. This verifies the forming quality of the finished screws from the core dimension of mechanical performance, effectively avoiding the risk of stripping or breakage during actual use due to insufficient thread strength or weak bonding, thus ensuring product reliability. Furthermore, a preset adjustment trigger condition for the proportion of non-conforming samples is set to avoid over-sensitivity in process control caused by adjusting parameters for a single non-conforming sample, ensuring the stability of the thread rolling process. Simultaneously, the moving speed and / or feed thrust of the dynamic thread rolling plate are adjusted specifically based on the strength difference, optimizing the forming effect of the thread rolling extrusion from the source to improve the pass rate of the finished product in subsequent processing.

[0054] In some further optimized embodiments of this application, the control method further includes a feedforward pre-compensation control step based on multi-dimensional quality inspection data. Specifically, this involves: correlating and fitting the image quality inspection data and physical performance quality inspection data of the finished screws in the previous production cycle to obtain a mapping relationship model between the forming quality deviation and the thread rolling process parameters; before replacing a new batch of screw blanks, taking a number of blanks from the batch for trial rolling to obtain the forming quality deviation data of the trial rolled finished products, inputting the deviation data into the mapping relationship model to obtain the pre-compensation value of the process parameters corresponding to the batch of blanks; during the formal processing of the batch of blanks, adjusting the initial feed thrust, first speed, and first stroke of the dynamic thread rolling plate in advance according to the pre-compensation value of the process parameters to achieve pre-compensation for batch differences in blanks. This feedforward pre-compensation control method breaks through the limitations of existing technologies that can only adjust process parameters through post-event feedback. In response to the characteristics of the round tail forming in this application, which is highly dependent on the plastic flow of materials and easily affected by the fluctuation of blank diameter and hardness, it predicts and compensates for the forming deviation caused by batch differences in advance, ensuring the forming consistency of screw products in the same batch and between different batches from the source. At the same time, it significantly reduces the trial and error cost and the defect rate when switching batches, and further improves the stability and economy of large-scale production.

[0055] Understandably, the first speed is 30% to 40% of the second speed, and the third speed is 70% to 80% of the second speed. The low-speed feeding (30% to 40%) allows the screw blank to be precisely embedded in the thread rolling area, ensuring the tail of the blank is above the forming area. This avoids material misalignment, impact-induced jamming, or defects at the beginning of the forming process. Simultaneously, the gentle initial contact lays the foundation for the core thread rolling without excessively slowing down the processing pace. The medium-low speed output (70% to 80%) avoids the inertial pulling caused by high-speed output, which can lead to thread breakage, rounded tail scratches, or jamming. It also matches the processing pace after the core thread rolling process, preventing finished product accumulation and ensuring stable output and continuous processing. This differentiated speed gradient is highly compatible with the structure of the thread rolling plate assembly. While balancing the needs for precise positioning, forming protection, and continuous processing at each stage, it simultaneously ensures the precision, production efficiency, and yield of the integrated thread rolling forming of rounded tail screws.

[0056] Thirdly, this application also provides an electronic device, comprising: at least one memory; at least one processor; at least one program; the program is stored in the memory, and the processor executes the at least one program to implement the control method for forming the thread rolling of a round-tailed screw as described in any embodiment of the first aspect.

[0057] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and signals, such as the program instructions / signals corresponding to the processing module in the embodiments of this application. The processor executes various functional applications and data processing by running the non-transitory software programs, instructions, and signals stored in the memory, thereby implementing the control method for round-tailed screw thread rolling in the above-described method embodiments.

[0058] The memory may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function. The data storage area may store data related to the control method for thread rolling of the round-tailed screw described above. Furthermore, the memory may include high-speed random access memory and non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processing module via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0059] One or more signals are stored in a memory, and when executed by one or more processors, the control method for forming the thread roll of the round-tailed screw in any of the above method embodiments is executed.

[0060] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that is executed by one or more processors, enabling the one or more processors to perform the control method for forming round-tailed screw threads in the above method embodiments.

[0061] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0062] Based on the above description of the embodiments, those skilled in the art will understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable signals, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible by a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable signals, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0063] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0064] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0065] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0066] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0067] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0068] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A thread rolling plate assembly for forming round-tailed screws, characterized in that, include: A static tooth rolling plate and a dynamic tooth rolling plate that cooperate with each other, wherein the opposite sides of the static tooth rolling plate and the dynamic tooth rolling plate are provided with a tooth rolling surface, a clearance groove and a closing part in sequence perpendicular to the tooth rolling direction; A thread rolling area is formed between the thread rolling surfaces of the static thread rolling plate and the dynamic thread rolling plate, which is used to perform thread rolling on the screw part of the screw blank. The thread geometry parameters of the thread rolling surfaces of the two are the same and the spatial installation directions are mirror images of each other. The clearance grooves of the static thread rolling plate and the dynamic thread rolling plate are located at the tail of the screw blank. The clearance grooves of the two plates close to form a forming area. The forming area is hemispherical and is used to accommodate the extruded material generated by the screw blank during thread rolling and to form a round tail. The closing portion of the static and dynamic tooth-rolling plates is used to seal the forming area.

2. The thread rolling plate assembly for forming round-tailed screws according to claim 1, characterized in that, The tooth ridges on the tooth-rubbing surface change from shallow to deep from the beginning to the end.

3. The thread rolling plate assembly for forming round-tailed screws according to claim 1, characterized in that, The cavitation channel has a discharge trough at its end, and the size of the discharge trough is larger than the size of the cavitation channel.

4. A method for controlling the thread rolling of round-tailed screws, characterized in that, The control method, applied to the thread rolling plate assembly for thread rolling of round-tailed screws as described in any one of claims 1 to 3, includes: The screw blank is placed into the beginning of the thread rolling area formed between the thread rolling surfaces of the static thread rolling plate and the dynamic thread rolling plate, and the dynamic thread rolling plate is controlled to move a preset first stroke at a preset first speed. The dynamic tooth-rolling board is controlled to increase from the first speed to a preset second speed, and moves at the second speed for a preset second stroke; The dynamic thread rolling plate is controlled to decrease from the second speed to a preset third speed, and moves at the third speed for a preset third stroke, and outputs the finished screw with threads and rounded tail from the end of the thread rolling area; The dynamic thread rolling plate is controlled to retract to the initial position and wait for the next screw blank to be placed in.

5. The control method for thread rolling of round-tailed screws according to claim 4, characterized in that, Also includes: During the movement of the dynamic tooth rolling plate, the extrusion force between the static tooth rolling plate and the dynamic tooth rolling plate is acquired in real time; When the extrusion pressure is less than the preset pressure threshold, the dynamic tooth rolling plate is controlled to increase the feed thrust and maintain the current moving speed. When the extrusion pressure exceeds the pressure threshold, the dynamic tooth-rolling board is controlled to reduce its moving speed and retract a preset distance.

6. The control method for thread rolling of round-tailed screws according to claim 4, characterized in that, After the step of outputting the finished screw with threads and rounded tail from the end of the thread-rolling area, the method further includes: Obtain the appearance image data of the finished screw after processing; The appearance image data is preprocessed by contour extraction and feature enhancement to obtain characteristic image information; The parameter analysis of the characterized image information yields the defect detection results of the screw, the measured value of the arc of the rounded tail, and the measured value of the thickness. The defect detection results are compared with the defect-free preset standard, and the measured values ​​of the arc and the thickness are compared with the corresponding preset tolerance ranges to obtain the image quality inspection results. Based on the image quality inspection results, the finished screws that are deemed unqualified by the image quality inspection results are rejected.

7. The control method for thread rolling of round-tailed screws according to claim 4, characterized in that, After the step of outputting the finished screw with threads and rounded tail from the end of the thread-rolling area, the method further includes: Several screws were randomly selected from the finished screws as quality inspection samples. Radial shear force is gradually applied to the toothed area of ​​the quality inspection sample, and circumferential torque is gradually applied to the joint between the toothed area and the screw, until the quality inspection sample shows a failure state of toothed deformation, stripping, or breakage, and the force value change data during the force application process is acquired in real time. The force value change data is processed by strength conversion calculation to obtain the shear strength value of the thread and the forming bond strength value between the thread and the screw. The shear strength value and molding bond strength value are compared with the corresponding preset performance standard values ​​to obtain the physical performance quality inspection results. If the physical performance quality inspection results show that the proportion of unqualified samples reaches a preset ratio, the moving speed and / or feed thrust of the dynamic tooth rolling plate are adjusted according to the strength difference of the physical performance quality inspection results.

8. The control method for thread rolling of round-tailed screws according to claim 4, characterized in that, The first speed is 30% to 40% of the second speed, and the third speed is 70% to 80% of the second speed.

9. An electronic device, characterized in that, include: At least one memory; At least one processor; At least one program; The program is stored in the memory, and the processor executes at least one of the programs to implement the control method for forming the thread roll of a round-tailed screw as described in any one of claims 4 to 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer-executable program for performing the control method for forming round-tailed screw threads as described in any one of claims 4 to 8.

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