Lens forging forming device and forging method

Abstract

This invention provides a lens forging and forming apparatus and a forging method, including a lower die mechanism and an upper die mechanism. The lower die mechanism includes a lower die base, a material-fixing area is provided on the top surface of the lower die base, a lower punching assembly is provided on one side of the material-fixing area, and a limiting groove is recessed on the other side of the material-fixing area, in which a pushing assembly is embedded. The lower punching assembly passes through the lower die base and extends vertically to form a lower punching stroke. The pushing assembly moves horizontally reciprocating to form a pushing stroke. The upper die mechanism includes an upper die base, a fixed plate is provided at the bottom of the upper die base, and a movable pressure plate is telescopically connected below the fixed plate. A punch is fixed downward from the fixed plate, and the punch passes through the movable pressure plate to form a relative punching stroke. A insert is fixed downward from the fixed plate, and the insert passes through the movable pressure plate to form a relative punching stroke. The punch and the lower punching assembly are pressed together directly opposite each other, causing the lower punching assembly to sink vertically downward. The insert and the pushing assembly are pressed together in a staggered manner, causing the pushing assembly to move horizontally towards the material-fixing area.

Description

Technical Field

[0001] This invention belongs to the field of mechanical technology and relates to a stamping die, particularly a lens forging forming device and forging method. Background Technology

[0002] Lenses require forging during production. The conventional process is rough forging, followed by CNC machining. This increases the number of steps, raises processing costs, extends the production cycle, and reduces production efficiency.

[0003] For example, Chinese patent literature has disclosed an upper and lower stamping fixture and processing equipment [Chinese Patent No.: 202223049685.8]. This utility model provides an upper and lower stamping fixture and processing equipment, including an upper die assembly and a lower die assembly that press together. At least one upper punch is pressed downwards in the upper die assembly, and an inner ejector cylinder is elastically pressed below the upper punch. The upper punch head at the bottom of the upper punch penetrates the inner ejector cylinder to form a vertical sliding connection. At least one lower punch is pressed upwards in the lower die assembly. The upper and lower punches are pressed together one above the other. This utility model uses elastic pressing combined with relative sliding assembly, thereby adjusting the pressure to switch the dominant force with the elastic force, changing the pressing trajectory, forming local cold pressing and shaping, and completing the special product design. Only one external pressure device is needed. By changing the elastic force to match the driving force required by the inner ejector, it is simpler than existing cold pressing operations, simplifying cumbersome operations and reducing equipment costs. It can also improve the mold structure to match the product shape, reducing material thickness through mold forging to meet product requirements.

[0004] The above-mentioned technical solutions lack a positioning forging structure for the characteristics of lens products, and cannot perform corresponding precise shaping for the lens forging parts. Furthermore, the waste generated during stamping cannot be discharged in time, which leads to problems such as affecting the stamping effect. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a lens forging and forming apparatus and a forging method.

[0006] The objective of this invention can be achieved through the following technical solution: A lens forging and forming device, comprising a lower die mechanism and an upper die mechanism, wherein the lower die mechanism includes a lower die base, a material fixing area is provided on the top surface of the lower die base, a lower stamping assembly is provided on one side of the material fixing area, and a limiting groove is recessed on the other side of the material fixing area, and a pushing assembly is embedded in the limiting groove; the lower stamping assembly passes through the lower die base and extends and retracts vertically to form a lower stamping stroke, and a suction and chip removal assembly is connected between the lower stamping assembly and the lower die base; the top of the pushing assembly protrudes from the limiting groove, and the pushing assembly moves horizontally reciprocating to form a pushing stroke;

[0007] The upper die mechanism includes an upper die base, the bottom of which has a fixed plate, and a movable pressure plate is telescopically connected below the fixed plate; a punch is fixed downward from the fixed plate, and the punch passes through the movable pressure plate to form a relative stamping stroke; a insert is fixed downward from the fixed plate, and the insert passes through the movable pressure plate to form a relative stamping stroke.

[0008] The punch is pressed against the lower punching assembly, causing the lower punching assembly to sink vertically downwards; the insert is pressed against the pusher assembly in a staggered manner, causing the pusher assembly to move horizontally towards the fixed material area.

[0009] In the above-mentioned lens forging and forming device, the lower die holder is embedded with a lower die insert block on one side of the fixed material area. The lower die holder and the lower die insert block have a lower punching hole. The lower punching hole is a variable diameter hole. The middle part of the lower punching hole expands outward to form an annular stepped hole. The top opening of the lower punching hole is recessed to form a forging cavity. The movable pressure plate is embedded with a stripper insert block. The punch passes through the stripper insert block to form free extension and retraction. The bottom surface of the stripper insert block has a recessed avoidance notch one, which corresponds to one side edge of the fixed material area. The movable pressure plate corresponds to the recessed avoidance groove on the pushing assembly. The inside of the avoidance groove is connected to an avoidance notch two, which corresponds to the other side edge of the fixed material area.

[0010] In the above-mentioned lens forging and forming device, the lower stamping assembly includes, from bottom to top, a lower nitrogen spring, a lower punch rod, and a lower die inner top. The bottom of the lower die inner top has an outwardly protruding annular platform, which is placed inside the annular stepped hole. A longitudinal displacement gap remains between the annular platform and the annular stepped hole. The top surface of the annular platform and the top wall of the annular stepped hole form a limiting stop. The top of the lower die inner top has an inner mandrel, which penetrates into the forging cavity.

[0011] In the above-mentioned lens forging and forming device, the pushing assembly includes a positioning slider that slides horizontally along the limiting groove. The positioning slider has a recessed mounting groove on one side facing the material fixing area. An elastic element is fixed in the mounting groove by screws. The elastic element protrudes from the limiting groove. The positioning slider has a downward inclined surface away from the top of the elastic element.

[0012] In the above-mentioned lens forging and forming device, the bottom inner side of the insert is recessed with a pushing stroke groove, the bottom end of the pushing stroke groove is connected to the avoidance notch through the upper inclined surface, the upper inclined surface and the lower inclined surface are fitted together to form a guide sliding connection, and the side wall of the pushing stroke groove is fitted together with the outer wall of the positioning slider to form a guide sliding connection.

[0013] In the above-mentioned lens forging and forming device, at least two upper nitrogen springs are provided in the upper mold base. The bottom end of the upper nitrogen spring pushes the upper striking plate. The bottom surface of the upper striking plate is fixedly connected to the upper striking rod. The upper striking rod passes through the fixed plate to form a telescopic sliding connection. The bottom end of the upper striking rod that passes through the fixed plate is fixedly connected to the movable pressure plate.

[0014] In the above-mentioned lens forging and forming device, the air suction and chip removal assembly includes an air suction pump, the air suction port of the air suction pump is connected to an air suction pipe, the air suction pipe is equipped with an air groove solenoid valve, the air suction pipe passes through the lower mold base and connects to the annular stepped hole, the inner top of the lower mold has a plurality of ventilation grooves arranged in a circumferential annular array, the ventilation grooves are straight grooves, the straight grooves penetrate the entire inner top of the lower mold from bottom to top, the peripheral wall of the inner top of the lower mold is recessed with a spiral groove, the spiral grooves and the straight grooves are connected at the intersection point.

[0015] In the above-mentioned lens forging and forming device, a guide sleeve is fixed on one side of the lower die base, and a lower limiting post is fixed on the other side of the lower die base. A guide post is fixed on one side of the upper die base, and an upper limiting post is fixed on the other side of the upper die base. The guide post passes through the guide sleeve to form a sliding connection. The upper limiting post and the lower limiting post are opposed vertically to form a limiting abutment. A guide cylinder is embedded in the top surface of the lower die base. A guide rod is fixed downward by the fixed plate. The guide rod passes through the movable pressure plate to form a sliding connection. The protruding end of the guide rod at the bottom passes through the guide cylinder to form a sliding connection.

[0016] A forging method for a lens forging forming apparatus, the forging method comprising the following:

[0017] S1. Place the lens product in the fixed material area of ​​the lower mold base and align the forging position of the lens product with the forging cavity. At this time, the inner top of the lower mold is supported by the elastic force of the lower nitrogen spring, so that the inner top extends into the forging cavity and is embedded in the center hole of the forging position.

[0018] S2. As the upper mold mechanism descends, the movable pressure plate first contacts the top surface of the lower mold base, causing the first clearance notch to engage with one side edge of the fixed lens product, and the second clearance notch to engage with the other side edge of the fixed lens product. At the same time, the inserter gradually extends into the limiting groove from top to bottom. The upper inclined surface of the inserter slides into contact with the lower inclined surface of the positioning slider, pushing the positioning slider towards the fixed material area until the elastic element presses against the edge of the lens product for fixation.

[0019] S3. The upper mold mechanism moves downward to press the movable pressure plate against the top surface of the lower mold base, forming a reverse pressure on the upper nitrogen spring. This causes the punch to continue moving downward relative to the movable pressure plate and punch the forging position of the lens product, causing the forging part of the lens product to bulge downward and embed into the forging cavity. At the same time, the inner top of the lower mold moves downward under the pressure holding force to compress the lower nitrogen spring.

[0020] S4. The upper mold mechanism moves upward, causing the movable pressure plate to rise and separate from the top surface of the lower mold base. The lower nitrogen spring supports the upper part of the lower mold to move upward and reset, and the lens product is removed.

[0021] In the forging method of the lens forging forming device described above, when it is necessary to suck air and remove chips, the suction pump and the air groove solenoid valve are turned on, and the suction force is generated by the top slot of the ventilation groove. The waste chips are sucked into the suction pipe along the ventilation groove and spiral groove on the inner top outer wall of the lower mold, and finally discharged.

[0022] Compared with existing technologies, this lens forging and forming apparatus and forging method have the following advantages:

[0023] 1. This forging fixture and method can directly form the product, thereby reducing CNC machining costs and simultaneously reducing post-processing grinding and polishing costs; shortening the work cycle and optimizing processing efficiency.

[0024] 2. The addition of embossing and creasing techniques to the stripped-out block effectively releases internal stress, ensuring that the product's appearance meets quality requirements.

[0025] 3. The inner ejector of the lower mold forms a material protection structure, which avoids the material from simply flowing up and down, and increases the function of flowing from the middle to the periphery, so that the product appearance meets the quality requirements.

[0026] 4. The use of a cutting tool driven spring positioning mechanism avoids inaccurate forging positioning caused by product shape tolerance, thus improving forging accuracy.

[0027] 5. Add a spiral and straight air passage to the top of the lower mold to avoid vacuum caused by the inability to exhaust air in this area. Use a solenoid valve to control the air intake and exhaust actions to suck out the generated waste and reduce crushing. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the lens forging and forming device.

[0029] Figure 2 This is a cross-sectional view of the mold-closing structure of the lens forging and forming device.

[0030] Figure 3 This is an enlarged structural diagram of the forging part of the lens forging forming device.

[0031] Figure 4 This is an enlarged structural diagram of the pressing component in the lens forging and forming device.

[0032] In the diagram, 1. Lower mold base; 2. Lower mold insert block; 3. Lower nitrogen spring; 4. Lower punch rod; 5. Lower mold inner top; 5a. Straight groove; 5b. Spiral groove; 6. Air groove solenoid valve; 7. Suction pipe; 8. Positioning slider; 9. Elastic element; 10. Upper mold base; 11. Fixed plate; 12. Upper nitrogen spring; 13. Upper punch plate; 14. Upper punch rod; 15. Movable pressure plate; 16. Stripper insert block; 17. Punch; 18. Inserting knife; 19. Guide sleeve; 20. Guide post; 21. Lower limit post; 22. Upper limit post; 23. Guide cylinder; 24. Guide rod. Detailed Implementation

[0033] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0034] Example 1

[0035] like Figures 1 to 4 As shown, this lens forging and forming device includes a lower die mechanism and an upper die mechanism. The lower die mechanism includes a lower die base 1, a material fixing area is provided on the top surface of the lower die base 1, a lower stamping assembly is provided on one side of the material fixing area, and a limiting groove is recessed on the other side of the material fixing area. A pushing assembly is embedded in the limiting groove. The lower stamping assembly passes through the lower die base 1 and extends and retracts vertically to form a lower stamping stroke. The gap between the lower stamping assembly and the lower die base 1 is connected to a suction and chip removal assembly. The top of the pushing assembly protrudes from the limiting groove, and the pushing assembly moves horizontally reciprocating to form a pushing stroke.

[0036] The upper mold mechanism includes an upper mold base 10, with a fixed plate 11 at the bottom of the upper mold base 10, and a movable pressure plate 15 telescopically connected below the fixed plate 11; a punch 17 is fixed downward from the fixed plate 11, and the punch 17 passes through the movable pressure plate 15 to form a relative punching stroke; a cutter 18 is fixed downward from the fixed plate 11, and the cutter 18 passes through the movable pressure plate 15 to form a relative punching stroke.

[0037] Punch 17 is pressed against the lower punch assembly, causing the lower punch assembly to sink vertically downwards; insert knife 18 is pressed against the push assembly in a staggered manner, causing the push assembly to move horizontally towards the fixed material area.

[0038] like Figure 1 and 2As shown, the lower die holder 1 is fitted with a lower die insert 2 on one side of the fixed material area. The lower die holder 1 and the lower die insert 2 have a lower punch hole. The lower punch hole is a variable diameter hole. The middle part of the lower punch hole expands outward to form an annular stepped hole. The top of the lower punch hole is recessed to form a forging cavity. The movable pressure plate 15 is fitted with a stripper insert 16. The punch 17 passes through the stripper insert 16 to form free extension and retraction. The bottom surface of the stripper insert 16 has a recessed avoidance notch 1, which corresponds to one side edge of the fixed material area. The movable pressure plate 15 corresponds to the recessed avoidance groove on the pushing assembly. The inside of the avoidance groove is connected to an avoidance notch 2, which corresponds to the other side edge of the fixed material area.

[0039] During the upper and lower die pressing operation, the forging cavity forms the die cavity for stamping the lens product, and the avoidance notch avoids the upward warping edge of the lens product. By using the 16 embossing points and lines of the ejector plate and the force of the nitrogen spring in the upper die, the lens product can be completely pressed down and the internal stress generated by forging the lens can be released, avoiding the influence of material thickness. Moreover, the lens forging area has a good forming effect and can be directly forged into place, reducing the need for subsequent CNC machining.

[0040] like Figure 3 As shown, the lower stamping assembly includes, from bottom to top, a lower nitrogen spring 3, a lower punch rod 4, and a lower die inner top 5. The bottom of the lower die inner top 5 has an outwardly protruding annular platform, which is placed inside an annular stepped hole. A longitudinal displacement gap is left between the annular platform and the annular stepped hole. The top surface of the annular platform and the top wall of the annular stepped hole form a limiting stop. The top of the lower die inner top 5 has an inner mandrel, which penetrates into the forging cavity.

[0041] The lower nitrogen spring 3 provides the elastic force for the vertical extension and retraction of the lower die inner ejector 5. The lower striking rod 4 connects and transmits the elastic force, while the lower die inner ejector 5 provides elastic support for the stamping part of the lens product. The height difference between the annular stepped hole and the annular platform determines the extension and retraction displacement of the lower die inner ejector 5, further influencing the forging shape of the lens product during stamping. Specifically, the inner ejector head is a frustum protrusion on the top of the lower die inner ejector 5, with rounded chamfers around its perimeter.

[0042] like Figures 1 to 3 As shown, the suction and chip removal assembly includes a suction pump, the suction port of the suction pump is connected to a suction pipe 7, a solenoid valve 6 for connecting the suction pipe 7 is installed on the suction pipe 7, the suction pipe 7 passes through the lower mold base 1 and connects to the annular stepped hole, the inner top of the lower mold 5 has several ventilation grooves arranged in a circumferential annular array, the ventilation grooves are straight grooves 5a, the straight grooves 5a pass through the entire inner top of the lower mold 5 from bottom to top, the peripheral wall of the inner top of the lower mold 5 is recessed with a spiral groove 5b, the spiral groove 5b and the straight groove 5a are connected at the intersection point.

[0043] like Figure 4As shown, the pressing assembly includes a positioning slider 8 that slides horizontally along a limiting groove. A mounting groove is recessed on the side of the positioning slider 8 facing the material-fixing area. An elastic element 9 is fixed in the mounting groove by screws. The elastic element 9 protrudes from the limiting groove, and a downward slope is provided on the top of the positioning slider 8 away from the top of the elastic element 9. The elastic element 9 is located on the inner side of the positioning slider 8, and the downward slope is located on the outer side. Applying force to push the downward slope causes the positioning slider 8 to move inward along the limiting groove, thereby pressing the elastic element 9 against the edge of the lens product to form a fixed shape.

[0044] The bottom inner side of the insert 18 is recessed with a pushing stroke groove. The bottom end of the pushing stroke groove connects to the avoidance notch via an upper inclined surface. The upper and lower inclined surfaces fit together to form a guide sliding connection. The side wall of the pushing stroke groove fits together with the outer wall of the positioning slider 8 to form a guide sliding connection. When the insert 18 moves downward, the upper and lower inclined surfaces contact each other, and the vertical pressure is converted into a horizontal thrust through the inclined surfaces, thereby pushing the positioning slider 8 inward to contact and fix the lens product. During the pushing process, the pushing stroke groove provides avoidance space for the upper and lower molds to cooperate vertically, avoiding interference with the pressing of the upper and lower molds.

[0045] like Figure 1 and 2 As shown, at least two upper nitrogen springs 12 are provided inside the upper mold base 10. The bottom end of the upper nitrogen spring 12 pushes against the upper striking plate 13. The bottom surface of the upper striking plate 13 is fixedly connected to the upper striking rod 14. The upper striking rod 14 passes through the fixed plate 11 to form a telescopic sliding connection. The bottom end of the upper striking rod 14, which extends out of the fixed plate 11, is fixedly connected to the movable pressure plate 15. The upper nitrogen springs 12 provide elastic pushing support for the movable pressure plate 15, and the upper striking plate 13 and the upper striking rod 14 provide elastic force transmission. At the same time, the upper striking plate 13 is used to achieve elastic pushing limit, and the upper striking rod 14 passes through the fixed plate 11 to connect the movable pressure plate 15. The upper nitrogen springs 12 achieve an elastic telescopic connection of the movable pressure plate 15.

[0046] like Figure 1 and 2 As shown, a guide sleeve 19 is fixed on one side of the lower mold base 1, and a lower limit post 21 is fixed on the other side of the lower mold base 1. A guide post 20 is fixed on one side of the upper mold base 10, and an upper limit post 22 is fixed on the other side of the upper mold base 10. The guide post 20 passes through the guide sleeve 19 to form a sliding connection. The upper limit post 22 and the lower limit post 21 are opposed to each other to form a limiting abutment. A guide cylinder 23 is embedded in the top surface of the lower mold base 1. A guide rod 24 is fixed downward from the fixed plate 11. The guide rod 24 passes through the movable pressure plate 15 to form a sliding connection. The protruding end of the guide rod 24 at the bottom passes through the guide cylinder 23 to form a sliding connection.

[0047] The guide post 20 and guide sleeve 19 work together to ensure precise positioning during the pressing of the lower and upper mold mechanisms. The guide rod 24 and guide cylinder 23 work together to ensure precise positioning of the movable pressure plate 15 and the top surface of the lower mold base 1 during pressing. These two guide structures work together to ensure precise pressing of the lens product by the upper and lower molds, improving the forging accuracy of the lens product. The upper limit post 22 and lower limit post 21 provide top pressure limiting, preventing over-pressing of the upper and lower mold mechanisms and thus avoiding product damage.

[0048] Example 2

[0049] Based on Embodiment 1, the difference in this embodiment is:

[0050] A forging method for a lens forging forming apparatus, the forging method comprising the following:

[0051] S1. Place the lens product in the fixed material area of ​​the lower mold base 1 and align the forging position of the lens product with the forging cavity. At this time, the inner top 5 of the lower mold is supported by the elastic force of the lower nitrogen spring 3, so that the inner top extends into the forging cavity and is embedded in the center hole of the forging position.

[0052] S2. When the upper mold mechanism moves downward, the movable pressure plate 15 first contacts the top surface of the lower mold base 1, so that the first clearance notch engages with one side edge of the fixed lens product, and the second clearance notch engages with the other side edge of the fixed lens product. At the same time, the inserter 18 gradually extends into the limiting groove from top to bottom. The upper inclined surface of the inserter 18 slides into contact with the lower inclined surface of the positioning slider 8, pushing the positioning slider 8 towards the fixed material area until the elastic element 9 presses against the edge of the lens product to fix it.

[0053] S3. The upper mold mechanism moves downward to press the movable pressure plate 15 against the top surface of the lower mold base 1, forming a reverse pressure on the upper nitrogen spring 12, causing the punch 17 to continue moving downward relative to the movable pressure plate 15 and punch the forging position of the lens product, so that the forging part of the lens product protrudes and is embedded into the forging cavity. At the same time, the inner top 5 of the lower mold moves downward under the pressure and compresses the lower nitrogen spring 3.

[0054] S4. The upper mold mechanism moves upward, causing the movable pressure plate 15 to rise and separate from the top surface of the lower mold base 1. The lower nitrogen spring 3 supports the upper mold top 5 to move upward and reset, and the lens product is removed.

[0055] In the forging method of the lens forging forming device described above, when it is necessary to suck air and remove chips, the suction pump and the air groove solenoid valve 6 are turned on, and the suction force is generated by the top slot of the ventilation groove. The waste chips are sucked into the suction pipe 7 along the ventilation groove and spiral groove 5b on the outer wall of the inner top 5 of the lower mold, and finally discharged.

[0056] Compared with existing technologies, this lens forging and forming apparatus and forging method have the following advantages:

[0057] 1. This forging fixture and method can directly form the product, thereby reducing CNC machining costs and simultaneously reducing post-processing grinding and polishing costs; shortening the work cycle and optimizing processing efficiency.

[0058] 2. The addition of embossing and creasing techniques to the stripped-out block effectively releases internal stress, ensuring that the product's appearance meets quality requirements.

[0059] 3. The inner ejector of the lower mold forms a material protection structure, which avoids the material from simply flowing up and down, and increases the function of flowing from the middle to the periphery, so that the product appearance meets the quality requirements.

[0060] 4. The use of a cutting tool driven spring positioning mechanism avoids inaccurate forging positioning caused by product shape tolerance, thus improving forging accuracy.

[0061] 5. Add a spiral and straight air passage to the top of the lower mold to avoid vacuum caused by the inability to exhaust air in this area. Use a solenoid valve to control the air intake and exhaust actions to suck out the generated waste and reduce crushing.

[0062] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0063] Although this document frequently uses terms such as lower mold base 1; lower mold insert block 2; lower nitrogen spring 3; lower punch rod 4; lower mold inner ejector 5; straight groove 5a; spiral groove 5b; air groove solenoid valve 6; suction pipe 7; positioning slider 8; elastic element 9; upper mold base 10; fixing plate 11; upper nitrogen spring 12; upper punch plate 13; upper punch rod 14; movable pressure plate 15; ejector plate insert block 16; punch 17; insert knife 18; guide sleeve 19; guide post 20; lower limit post 21; upper limit post 22; guide cylinder 23; guide rod 24, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A lens swage forming apparatus comprising a lower die mechanism and an upper die mechanism, characterized by, The lower die mechanism includes a lower die base, a material fixing area is provided on the top surface of the lower die base, a lower stamping assembly is provided on one side of the material fixing area, and a limiting groove is recessed on the other side of the material fixing area. A pushing assembly is embedded in the limiting groove. The lower stamping assembly passes through the lower die base and extends and retracts vertically to form a lower stamping stroke. A suction and chip removal assembly is connected to the gap between the lower stamping assembly and the lower die base. The top of the pushing assembly protrudes from the limiting groove, and the pushing assembly moves horizontally reciprocating to form a pushing stroke. The upper die mechanism includes an upper die base, the bottom of which has a fixed plate, and a movable pressure plate is telescopically connected below the fixed plate; a punch is fixed downward from the fixed plate, and the punch passes through the movable pressure plate to form a relative stamping stroke; a insert is fixed downward from the fixed plate, and the insert passes through the movable pressure plate to form a relative stamping stroke. The punch is pressed against the lower punching assembly, causing the lower punching assembly to sink vertically downwards; the insert is pressed against the pusher assembly in a staggered manner, causing the pusher assembly to move horizontally towards the fixed material area. The lower die holder is fitted with a lower die insert block on one side of the material fixing area. A lower punching hole is opened in both the lower die holder and the lower die insert block. The lower punching hole is a variable diameter hole, with its center expanding outwards to form an annular stepped hole. The top opening of the lower punching hole is recessed to form a forging cavity. A stripper insert block is embedded in the movable pressure plate. The punch passes through the stripper insert block to form free extension and retraction. A first clearance notch is recessed on the bottom surface of the stripper insert block, corresponding to one edge of the material fixing area. A clearance groove is recessed on the movable pressure plate corresponding to the pushing assembly. A second clearance notch is connected to the inner side of the clearance groove, corresponding to the other edge of the material fixing area. The lower stamping assembly includes, from bottom to top, a lower nitrogen spring, a lower punch rod, and a lower die inner top. The bottom of the lower die inner top protrudes outward to form an annular platform. The annular platform is placed inside the annular stepped hole, and a longitudinal displacement gap remains between the annular platform and the annular stepped hole. The top surface of the annular platform and the top wall of the annular stepped hole form a limiting stop. The top of the lower die inner top has an inner ejector, which penetrates into the forging cavity. The pushing assembly includes a positioning slider that slides horizontally along the limiting groove. The positioning slider has a recessed mounting groove on the side facing the material fixing area. An elastic element is fixed in the mounting groove by screws. The elastic element protrudes from the limiting groove. The positioning slider has a downward inclined surface away from the top of the elastic element. At least two upper nitrogen springs are provided inside the upper mold base. The bottom end of the upper nitrogen spring pushes the upper striking plate. The bottom surface of the upper striking plate is fixedly connected to the upper striking rod. The upper striking rod passes through the fixed plate to form a telescopic sliding connection. The bottom end of the upper striking rod that passes through the fixed plate is fixedly connected to the movable pressure plate. The suction and chip removal assembly includes a suction pump, the suction port of which is connected to a suction pipe. A solenoid valve for air grooves is installed on the suction pipe. The suction pipe passes through the lower mold base and connects to the annular stepped hole. A plurality of ventilation grooves are arranged in a circumferential annular array around the inner top of the lower mold. The ventilation grooves are straight grooves that penetrate the entire inner top of the lower mold from bottom to top. A spiral groove is recessed on the peripheral wall of the inner top of the lower mold. The spiral groove and the straight groove are connected at the intersection point.

2. The lens press forming apparatus according to claim 1, wherein The bottom inner side of the insert is recessed with a pushing stroke groove. The bottom end of the pushing stroke groove is connected to the avoidance notch three through the upper inclined surface. The upper inclined surface and the lower inclined surface fit together to form a guide sliding connection. The side wall of the pushing stroke groove fits together with the outer wall of the positioning slider to form a guide sliding connection.

3. The lens press forming apparatus according to claim 1, wherein A guide sleeve is fixed on one side of the lower mold base, and a lower limiting post is fixed on the other side of the lower mold base. A guide post is fixed on one side of the upper mold base, and an upper limiting post is fixed on the other side of the upper mold base. The guide post passes through the guide sleeve to form a sliding connection. The upper limiting post and the lower limiting post are vertically opposed to each other to form a limiting abutment. A guide cylinder is embedded in the top surface of the lower mold base. A guide rod is fixed downward by the fixed plate. The guide rod passes through the movable pressure plate to form a sliding connection. The protruding end of the guide rod at the bottom passes through the guide cylinder to form a sliding connection.

4. A forging method of a lens forging forming apparatus, characterized by, Including the lens forging apparatus as described in claim 2 or 3, the forging method includes the following: S1. Place the lens product in the fixed material area of ​​the lower mold base and align the forging position of the lens product with the forging cavity. At this time, the inner top of the lower mold is supported by the elastic force of the lower nitrogen spring, so that the inner top extends into the forging cavity and is embedded in the center hole of the forging position. S2. As the upper mold mechanism descends, the movable pressure plate first contacts the top surface of the lens product on the lower mold base, causing the first clearance notch to engage with one side edge of the fixed lens product, and the second clearance notch to engage with the other side edge of the fixed lens product. At the same time, the insert gradually extends into the limiting groove from top to bottom. The upper inclined surface of the insert slides into contact with the lower inclined surface of the positioning slider, pushing the positioning slider towards the fixed material area until the elastic element presses against the edge of the lens product for fixation. S3. The upper die mechanism moves downward to press the movable pressure plate against the top surface of the lower die base, forming a reverse pressure on the upper nitrogen spring. This causes the punch to continue moving downward relative to the movable pressure plate and punch the forging position of the lens product, causing the forging part of the lens product to bulge downward and embed into the forging cavity. At the same time, the inner top of the lower die moves downward under the pressure holding force to compress the lower nitrogen spring. S4. The upper mold mechanism moves upward, causing the movable pressure plate to rise and separate from the top surface of the lower mold base. The lower nitrogen spring supports the upper part of the lower mold to move upward and reset, and the lens product is removed.

5. The method of claim 4, wherein the lens is forged by the lens forging apparatus. When air suction and chip removal are required, the air suction pump and air groove solenoid valve are turned on. The suction force is generated by the top opening of the air groove. The waste chips are sucked into the air suction pipe along the air groove and spiral groove on the inner top outer wall of the lower mold, and finally discharged.

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