Die structure capable of achieving stretching belt chamfering forming without turnover mechanism
By integrating the stretching and chamfering processes into the same mold structure in cold heading technology, and utilizing the inclined cooperation between the pressing block and the forming rod, the limitations of equipment selection and the cumbersome production process in the existing technology are solved, and efficient and stable stretching and chamfering forming is achieved.
Patent Information
- Application Number
- CN202511462560.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-14
- Publication Date
- 2025-11-18
AI Technical Summary
In existing cold heading technology, stretching and chamfering require two stations, which rely on a flipping mechanism. This leads to limitations in equipment selection, cumbersome production processes, low efficiency, poor process flexibility, and the need to adjust parameters when using the flipping mechanism, affecting the efficiency of multiple batches of production.
Design a mold structure that eliminates the need for a flipping mechanism, integrating the stretching and chamfering processes into a single mold. Single-station forming is achieved through the cooperation of the pressing block and the forming rod's ramp. Combined with structures such as push plates, springs, and limiting grooves, the stability and precision of the processed parts are ensured.
Simplify the processing flow, improve cold heading efficiency, reduce the defect rate, ensure the geometric shape and dimensional consistency of processed parts, and improve product quality stability.
Smart Images
Figure CN120961825A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cold heading technology, specifically to a mold structure that can achieve chamfering of stretch strips without the need for a flipping mechanism. Background Technology
[0002] In the forming process of stretched parts that require chamfering, the existing technology mainly adopts two steps: stretching first and then chamfering. However, stretching and chamfering require two stations, and a flipping structure is needed to transport the workpiece during the processing.
[0003] However, this existing technology, which relies on a flipping mechanism, has several significant problems. First, there are limitations in equipment selection. Most ordinary cold heading machines lack a flipping function, and even those equipped with one often suffer from insufficient flipping stroke, failing to meet the processing requirements of long products. This severely restricts production due to equipment performance, making it difficult to deploy many ordinary machines. Second, stretching and chamfering require two workstations, leading to a cumbersome production process and consequently low efficiency. When using a flipping mechanism, time is often required to replace relevant components or adjust parameters for different products. This means that the length of the workpiece varies, and the flipping mechanism needs adjustment when processing workpieces of different lengths; otherwise, smooth transport cannot be achieved. This process prolongs the production preparation cycle, significantly impacting overall efficiency, especially in multi-batch production. Furthermore, the lack of process flexibility is also prominent. Because the forming process is entirely tied to the equipment's flipping function, if the function malfunctions or the parameters are incompatible with the product, processing cannot proceed normally. This results in weak adaptability to product specifications and significant processing limitations. Summary of the Invention
[0004] To address the aforementioned issues, a mold structure is provided that enables stretching and chamfering without a flipping mechanism. By integrating the stretching and chamfering processes into a single mold structure, the processing flow that originally required multiple stations can be completed at a single station without the need for a flipping mechanism, effectively reducing the number of stations required for the cold heading process. This design not only simplifies the processing flow but also avoids the time loss caused by multiple station transitions.
[0005] To address the problems of existing technologies, this invention provides a mold structure that enables chamfering of stretch strips without the need for a flipping mechanism, comprising a main mold and a secondary mold; The main mold is equipped with a pressing groove, a pressing block, and a forming rod; The pressing groove is formed along the extension direction of the main mold on the end of the main mold facing the auxiliary mold; The pressing block has a ring structure and is slidably disposed in the pressing groove along the extension direction of the pressing groove; The forming rod is moved and positioned in the pressing groove along the extension direction of the pressing groove and passes through the pressing block. The pressing block and the forming rod are slidably engaged. The side wall of the forming rod has a first slope. A forming groove is horizontally provided on the end of the sub-mold facing the main mold. A second slope is provided on the inner wall of the forming groove. After the main mold and the sub-mold are closed, a cavity for forming the workpiece is formed. The first slope and the second slope form the chamfer of the workpiece in the cavity.
[0006] Preferably, the main mold also includes a push plate and a spring; The push plate is moved along the extension direction of the pressing groove and is set on one side of the pressing groove; The spring is set in the pressing groove and its two ends are fixedly connected to the push plate and the pressing block, respectively.
[0007] Preferably, a push rod is horizontally fixed at one end of the push plate facing the pressing block, and the push plate pushes the forming rod through the push rod.
[0008] Preferably, the main mold is also provided with a fixing pin, which passes through the push plate and push rod in sequence along the horizontal direction of the pressing groove and is assembled and connected to the forming rod.
[0009] Preferably, a mounting groove is provided at the end of the pressing block that presses the workpiece, and a contact ring is provided in the mounting groove, through which the pressing block presses the workpiece.
[0010] Preferably, a limiting groove is provided at the end of the pressing groove away from the sub-mold. Both the pressing groove and the limiting groove are cylindrical structures with collinear axes. The diameter of the pressing groove is smaller than the diameter of the limiting groove. The push plate is slidably disposed in the limiting groove along the extension direction of the pressing groove.
[0011] Preferably, a shaping groove is also provided in the sub-mold. The shaping groove is located on one side of the forming groove along the axis of the forming groove. The shaping groove is used to receive one end of the processed part that is pushed out by the forming rod.
[0012] Preferably, the secondary mold also includes a sliding groove and an ejector block; The sliding groove is located on one side of the forming groove and is connected to the forming groove; The ejector block is slidably disposed in the sliding groove along the extension direction of the sliding groove, and the shaping groove is disposed at the end of the ejector block.
[0013] Preferably, a limiting ring is fixedly provided at the end of the pressing groove near the sub-mold, the limiting ring being used to confine the pressing block within the pressing groove.
[0014] Preferably, when the sub-mold slides into the pressing groove, there is a gap between the sub-mold and the inner ring side of the limiting ring.
[0015] The advantages of this invention compared to the prior art are: 1. This invention integrates the stretching and chamfering processes into a single mold structure, eliminating the need for a flipping mechanism. This allows the processing flow, which originally required multiple stations, to be completed at a single station, effectively reducing the number of stations needed for cold heading. This design not only simplifies the processing flow and avoids time losses caused by multiple station transitions, significantly improving the overall efficiency of cold heading, but also eliminates positioning errors that may arise from the use of a flipping mechanism, fundamentally reducing accuracy losses during process transitions.
[0016] 2. Through the synergistic action of the pressing block and the spring, a stable and controllable pressure is continuously applied to the end of the workpiece during the entire cold heading and stretching process, forming a reliable radial constraint. This constraint mechanism effectively prevents the end of the workpiece from displacing or deforming radially when the forming rod applies axial force for stretching. From a structural perspective, it avoids problems such as workpiece shape distortion and dimensional deviation, significantly reducing the defect rate while ensuring the geometric stability of the workpiece.
[0017] 3. The first slope on the side wall of the forming rod and the second slope on the inner wall of the forming groove precisely match within the cavity, enabling simultaneous chamfering during the stretching process, achieving integrated stretching and chamfering. Simultaneously, the limiting groove's movement of the push plate ensures uniformity in the stretching length, while the shaping groove's support at the end of the workpiece prevents ejection deformation. These multiple structural designs work together to ensure consistent dimensional accuracy and chamfering quality, significantly improving the stability and reliability of product quality. Attached Figure Description
[0018] Figure 1 This is a three-dimensional schematic diagram of the mold structure of the present invention, which can achieve chamfering of stretch strip without the need for a flipping mechanism, when separated.
[0019] Figure 2 This is a cross-sectional three-dimensional schematic diagram of the mold structure of the present invention, which can achieve chamfering of stretch strip without the need for a flipping mechanism, when separated.
[0020] Figure 3 This is a three-dimensional schematic diagram of the mold structure of the present invention, which can achieve chamfering of stretch strip without the need for a flipping mechanism, when closed.
[0021] Figure 4 This is a side view of the mold structure of the present invention, which can achieve chamfering of stretch strip without the need for a flipping mechanism, when closed.
[0022] Figure 5 This invention relates to a mold structure that enables chamfering of stretch strips without the need for a flipping mechanism. Figure 4 Schematic diagram of cross-section at point AA.
[0023] Figure 6This is a cross-sectional three-dimensional schematic diagram of the mold structure of the present invention, which can achieve chamfering of stretch strip without the need for a flipping mechanism, when closed.
[0024] Figure 7 This invention relates to a mold structure that enables chamfering of stretch strips without the need for a flipping mechanism. Figure 6 A magnified view of a portion of point B in the middle.
[0025] Figure 8 This is a three-dimensional schematic diagram of a mold structure for forming chamfered stretch strips without the need for a flipping mechanism, as described in this invention, after removing the main mold.
[0026] Figure 9 This is a three-dimensional schematic diagram of the pressing block after removing the contact ring in a mold structure for forming a chamfered stretch strip without a flipping mechanism, according to the present invention.
[0027] The diagram is labeled as follows: 1. Main mold; 11. Pressing groove; 12. Pressing block; 121. Mounting groove; 122. Contact ring; 13. Forming rod; 131. First ramp; 14. Push plate; 141. Push rod; 142. Fixing pin; 15. Spring; 16. Limiting groove; 17. Limiting ring; 2. Sub-mold; 21. Forming groove; 211. Second ramp; 22. Shaping groove; 23. Sliding groove; 24. Ejector block; 3. Processed part. Detailed Implementation
[0028] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
[0029] Reference Figures 1-5 A mold structure that enables chamfering of a stretch strip without the need for a flipping mechanism, comprising a main mold 1 and a secondary mold 2; The main mold 1 is provided with a pressing groove 11, a pressing block 12 and a forming rod 13; The pressing groove 11 is formed along the extension direction of the main mold 1 at one end of the main mold 1 facing the auxiliary mold 2; The pressing block 12 has a ring structure and is slidably disposed in the pressing groove 11 along the extension direction of the pressing groove 11; The forming rod 13 is moved and disposed in the pressing groove 11 along the extension direction of the pressing groove 11 and passes through the pressing block 12. The pressing block 12 and the forming rod 13 are slidably engaged. The side wall of the forming rod 13 has a first slope 131. A forming groove 21 is horizontally provided on the end of the sub-mold 2 facing the main mold 1. A second slope 211 is provided on the inner wall of the forming groove 21. After the main mold 1 and the sub-mold 2 are closed, a cavity for forming the workpiece 3 is formed. The first slope 131 and the second slope 211 form the chamfer of the workpiece 3 in the cavity.
[0030] When forming part 3, it needs to go through multiple cold heading stations to form the final product. These stations are all used for cold heading, allowing part 3 to be gradually formed. However, the more stations there are, the lower the efficiency. Therefore, the stretching and chamfering processes are structured to avoid using a flipping mechanism. However, when cold heading and stretching part 3 with chamfers, the ends of part 3 need to be fixed. Otherwise, during stretching, the ends of part 3 may shift radially, causing the shape of part 3 to become deformed, thus increasing the defect rate.
[0031] To avoid the aforementioned issues, the existing mold structure was redesigned. This new mold structure allows both stretching and chamfering to be completed in a single process, improving cold heading efficiency and preventing deformation during the cold heading of part 3, thus reducing the defect rate. The specific structure and working process of this invention are as follows: The mold structure of this invention is set at one of the multiple stations in the cold heading process. A robot arm delivers the workpiece 3, which has been cold-headed at the previous station, to the mold structure of this invention. At this time, the main mold 1 and the auxiliary mold 2 are separated. The robot arm clamps the workpiece 3 and moves it between the main mold 1 and the auxiliary mold 2. Then, the main mold 1 moves towards the auxiliary mold 2 and gradually clamps the workpiece 3 using the pressing block 12. After that, the robot arm is withdrawn, and the workpiece 3 will not fall off because it is clamped by the main mold 1 and the auxiliary mold 2. Subsequently, the main mold 1 moves closer to the secondary mold 2, and the pressing block 12 gradually slides into the pressing groove 11. It is worth noting that when the pressing block 12 slides into the pressing groove 11, the pressing block 12 always presses one end of the workpiece 3 tightly against the secondary end. When the end of the secondary mold 2 is completely slid into the pressing groove 11, the main mold 1 stops moving, and the forming rod 13 set in the pressing groove 11 begins to move along the extension direction of the pressing groove 11. When the forming rod 13 is in the initial position, the workpiece 3 is in a processing state. The workpiece 3 in the processing state has a straw hat-shaped structure, that is, there is a groove inside the workpiece 3. The end of the forming rod 13 extends into the groove of the workpiece 3 and contacts the bottom. Then the forming rod 13 is hydraulically driven, and the forming rod 13 applies pressure to the bottom of the groove of the workpiece 3 and drives the side wall of the workpiece 3 to gradually stretch. Because the pressing block 12 always presses down one end of the workpiece 3, it prevents the end of the workpiece 3 from moving radially when the forming rod 13 extends into the forming groove 21, thus preventing the workpiece 3 from deforming during this process. When the forming rod 13 is fully extended into the forming groove 21, the forming rod 13 stops moving. At this time, there is a first annular gap between the forming rod 13 and the forming groove 21, and a second annular gap between the first slope 131 and the second slope 211. The thickness of the first annular gap is equal to the thickness of the second annular gap. The first slope 131 and the second slope 211 together form the chamfer of the workpiece 3. After cold heading, the forming rod 13 is first withdrawn from the forming groove 21. During the withdrawal process, the pressing block 12 keeps the workpiece 3 pressed against the end of the sub-mold 2 to prevent the workpiece 3 from being withdrawn along with the forming rod 13, which would prevent the subsequent robot arm from properly clamping the workpiece 3 and moving it to the next station. After the forming rod 13 is reset, the main mold 1 moves in the opposite direction, and the sub-mold 2 gradually slides out of the pressing groove 11. At this time, the pressing block 12 keeps pressing the end of the workpiece 3. When the end of the main mold 1 and the end of the sub-mold 2 are coplanar, the main mold 1 continues to move along its inherent direction, and the pressing block 12 moves with the main mold 1 and disengages from the workpiece 3. Then, the workpiece 3 in the sub-mold 2 is ejected, and the robot arm clamps and transports the ejected workpiece 3 to the next station, repeating the cycle.
[0032] Reference Figure 5 and Figure 6 The main mold 1 also includes a push plate 14 and a spring 15; The push plate 14 is movable and disposed on one side of the pressing groove 11 along the extending direction of the pressing groove 11; Spring 15 is disposed in pressing groove 11 and both ends of spring 15 are fixedly connected to push plate 14 and pressing block 12 respectively.
[0033] During the mold closing process of the main mold 1 and the auxiliary mold 2, the pressing block 12 moves towards the auxiliary mold 2 along with the main mold 1. When the pressing block 12 contacts the end of the workpiece 3, it continues to move with the main mold 1 and pushes the workpiece 3 into the forming groove 21 of the auxiliary mold 2. Since the workpiece 3 has a straw hat-shaped structure before processing, one end of the workpiece 3 will be intercepted by the end of the auxiliary mold 2 after it is pushed into the forming groove 21. At this time, the pressing block 12 presses one end of the workpiece 3 onto the auxiliary mold 2. Subsequently, the main mold 1 continues to move, and the position of the push plate 14 in the main mold 1 remains unchanged. The pressing block 12 is squeezed by the auxiliary mold 2 and gradually slides into the pressing groove 11. At this time, the distance between the pressing block 12 and the push plate 14 gradually decreases, and the spring 15 is gradually compressed. The reaction force of the spring 15 acts on the pressing block 12, so that the pressing block 12 initially clamps the workpiece 3. Subsequently, the push plate 14 is hydraulically driven, gradually pushing the forming rod 13 towards the sub-mold 2. This causes the forming rod 13 to stretch the workpiece 3. During this process, the workpiece 3 is gradually stretched, and the distance between the push plate 14 and the pressing block 12 further decreases. The spring 15 is further compressed, which further enhances the reaction force of the spring 15. This prevents the end of the workpiece 3 from moving radially during stretching, thus reducing the defect rate. After cold heading, the forming rod 13 is withdrawn first, and the spring force of the spring 15 gradually decreases. After the forming rod 13 returns to its original position, the spring 15 is still in a compressed state. Then, the main mold 1 begins to separate from the sub-mold 2. Under the action of the spring 15, the pressing block 12 keeps the end of the workpiece 3 pressed against the sub-mold 2. When the end of the pressing block 12 is coplanar with the end of the main mold 1, the spring 15 returns to its original state, and the pressing block 12 is withdrawn synchronously with the main mold 1. The pressing block 12 no longer presses the workpiece 3.
[0034] Reference Figure 5 and Figure 6 A push rod 141 is horizontally fixed at one end of the push plate 14 facing the pressing block 12. The push plate 14 pushes the forming rod 13 through the push rod 141.
[0035] By setting a push rod 141 between the push plate 14 and the forming rod 13, the pushing force of the push plate 14 is transmitted to the forming rod 13 by the push rod 141.
[0036] Reference Figure 5 and Figure 6 The main mold 1 is also provided with a fixing pin 142, which passes through the push plate 14 and the push rod 141 in sequence along the horizontal direction of the pressing groove 11 and is assembled and connected to the forming rod 13.
[0037] The fixing pin 142 is assembled and connected to the forming rod 13. Various assembly and connection methods are available, such as threaded connections and snap-fit connections. The specific method should be selected based on the actual situation to facilitate quick replacement of the forming rod 13. After a period of use, the forming rod 13 will experience wear, leading to deformation of its end or sidewalls. To ensure the machining accuracy of the workpiece 3, the forming rod 13 needs to be replaced periodically.
[0038] Reference Figure 2 and Figure 9 An installation groove 121 is provided at the end of the pressing block 12 that presses the workpiece 3. A contact ring 122 is provided in the installation groove 121, and the pressing block 12 presses the workpiece 3 through the contact ring 122.
[0039] If the pressing block 12 is used to directly press the end of the workpiece 3, after a long period of use, the end of the pressing block 12 used to press the workpiece 3 will wear out, and the pressing block 12 will need to be replaced. However, the pressing block 12 is provided with a mounting groove 121 and a replaceable contact ring 122 is provided in the mounting groove 121, which reduces the subsequent maintenance and use costs.
[0040] Reference Figure 5 and Figure 6 A limiting groove 16 is provided at the end of the pressing groove 11 away from the sub-mold 2. Both the pressing groove 11 and the limiting groove 16 are cylindrical structures and their axes are collinear. The diameter of the pressing groove 11 is smaller than the diameter of the limiting groove 16. The push plate 14 is slidably disposed in the limiting groove 16 along the extension direction of the pressing groove 11.
[0041] When the forming rod 13 presses and stretches the workpiece 3, the push plate 14 stops moving when it reaches the connection between the pressing groove 11 and the limiting groove 16. At this time, the forming rod 13 completes the stretching of the workpiece 3. This ensures the uniformity of the stretching length of the processing frame.
[0042] Reference Figure 7 In the secondary mold 2, a shaping groove 22 is also provided. The shaping groove 22 is located on one side of the forming groove 21 along the axis of the forming groove 21. The shaping groove 22 is used to receive one end of the processed part 3 pushed out by the forming rod 13.
[0043] When the workpiece 3 is stretched by the forming rod 13, the end of the forming rod 13 needs to be inserted into the groove of the workpiece 3, which makes the end of the workpiece 3 that is pushed by the forming rod 13 prone to deformation. However, by using the shaping groove 22 to support the end of the workpiece 3 that is pushed out by the forming rod 13, the deformation of the end of the workpiece 3 can be avoided.
[0044] Reference Figure 7The secondary mold 2 is also equipped with a sliding groove 23 and an ejector block 24; The sliding groove 23 is formed on one side of the forming groove 21 and is connected to the forming groove 21; The ejector block 24 is slidably disposed in the sliding groove 23 along the extension direction of the sliding groove 23, and the shaping groove 22 is disposed at the end of the ejector block 24.
[0045] A sliding groove 23 is provided at the end of the forming groove 21 away from the main mold 1. An ejector block 24 is slidably disposed in the sliding groove 23, and a shaping groove 22 is disposed at the end of the ejector block 24. After cold heading is completed, the ejector block 24 ejects the workpiece 3.
[0046] Reference Figure 6 A limiting ring 17 is fixedly provided at the end of the pressing groove 11 near the sub-mold 2. The limiting ring 17 is used to restrict the pressing block 12 within the pressing groove 11.
[0047] Reference Figures 1-9 When the secondary mold 2 slides into the pressing groove 11, there is a gap between the secondary mold 2 and the inner ring side of the limiting ring 17.
[0048] When the secondary mold 2 slides into the pressing groove 11, there is a gap between the secondary mold 2 and the inner ring side of the limiting ring 17, which reduces the resistance when the secondary mold 2 slides into the pressing groove 11.
[0049] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.
Claims
1. A mold structure for forming a chamfered stretch strip without the need for a flipping mechanism, comprising a main mold (1) and a secondary mold (2). Its features are, The main mold (1) is provided with a pressing groove (11), a pressing block (12) and a forming rod (13). The pressing groove (11) is opened along the extension direction of the main mold (1) on one end of the main mold (1) facing the auxiliary mold (2); The pressing block (12) has a ring structure and is slidably disposed in the pressing groove (11) along the extension direction of the pressing groove (11); The forming rod (13) is moved and disposed in the pressing groove (11) along the extension direction of the pressing groove (11) and passes through the pressing block (12). The pressing block (12) and the forming rod (13) are slidably engaged. The side wall of the forming rod (13) has a first slope (131). A molding groove (21) is horizontally provided on one end of the sub-mold (2) facing the main mold (1). A second slope (211) is provided on the inner wall of the molding groove (21). After the main mold (1) and the sub-mold (2) are closed, a cavity for molding the workpiece (3) is formed. The first slope (131) and the second slope (211) form the chamfer of the workpiece (3) in the cavity.
2. The mold structure for chamfering of a stretch strip without a flipping mechanism as described in claim 1, characterized in that, The main mold (1) also includes a push plate (14) and a spring (15); The push plate (14) is moved along the extension direction of the pressing groove (11) and is disposed on one side of the pressing groove (11); The spring (15) is set in the pressing groove (11) and the two ends of the spring (15) are fixedly connected to the push plate (14) and the pressing block (12) respectively.
3. The mold structure for achieving chamfering of a stretch strip without a flipping mechanism as described in claim 2, characterized in that, A push rod (141) is horizontally fixed at one end of the push plate (14) facing the pressing block (12), and the push plate (14) pushes the forming rod (13) through the push rod (141).
4. The mold structure for chamfering of a stretch strip without a flipping mechanism as described in claim 3, characterized in that, The main mold (1) is also provided with a fixing pin (142). The fixing pin (142) passes through the push plate (14) and the push rod (141) in sequence along the horizontal direction of the pressing groove (11) and is assembled and connected with the forming rod (13).
5. The mold structure for achieving chamfering of a stretch strip without a flipping mechanism according to claim 1, characterized in that, An installation groove (121) is provided at the end of the pressing block (12) that presses the workpiece (3). A contact ring (122) is provided in the installation groove (121), and the pressing block (12) presses the workpiece (3) through the contact ring (122).
6. The mold structure for achieving chamfering of a stretch strip without a flipping mechanism according to claim 1, characterized in that, A limiting groove (16) is provided at the end of the pressing groove (11) away from the sub-mold (2). Both the pressing groove (11) and the limiting groove (16) are cylindrical structures and their axes are collinear. The diameter of the pressing groove (11) is smaller than the diameter of the limiting groove (16). The push plate (14) is slidably disposed in the limiting groove (16) along the extension direction of the pressing groove (11).
7. The mold structure for achieving chamfering of a stretch strip without a flipping mechanism according to claim 1, characterized in that, A shaping groove (22) is also provided in the sub-mold (2). The shaping groove (22) is located on one side of the forming groove (21) along the axis of the forming groove (21). The shaping groove (22) is used to receive one end of the processed part (3) pushed out by the forming rod (13).
8. The mold structure for achieving chamfering of a stretch strip without a flipping mechanism according to claim 7, characterized in that, The sub-mold (2) is also provided with a sliding groove (23) and an ejector block (24); The sliding groove (23) is opened on one side of the forming groove (21) and is connected to the forming groove (21); The ejector block (24) is slidably disposed in the sliding groove (23) along the extension direction of the sliding groove (23), and the shaping groove (22) is disposed at the end of the ejector block (24).
9. A mold structure for achieving chamfering of a stretch strip without a flipping mechanism, as described in claim 1, characterized in that, A limiting ring (17) is fixedly provided at the end of the pressing groove (11) near the sub-mold (2). The limiting ring (17) is used to restrict the pressing block (12) within the pressing groove (11).
10. A mold structure for forming a chamfered stretch strip without a flipping mechanism, as described in claim 9, is characterized in that... When the sub-mold (2) slides into the pressing groove (11), there is a gap between the sub-mold (2) and the inner ring side of the limiting ring (17).