Production mold for free ring curved lens

Abstract

The utility model discloses a production die of a free ring curved lens, which comprises a female die, a male die and a connecting sleeve, the female die and the male die have the same boundary dimension, are of a cake-shaped structure, and are used in pairs; during die assembly, the female die and the male die are fixedly sleeved with the connecting sleeves respectively; and the female die, the male die and the connecting sleeve are respectively provided with a positioning device. The utility model has the beneficial effects that the positions of the female die and the male die in the connecting sleeve can be accurately positioned and the changes of the female die and the male die can be limited through the positioning device, so that the positions of the female die and the male die in the connecting sleeve are relatively fixed, and the relative fixation of the positions of the female die and the male die is further realized. Therefore, the purpose of batch production of the free ring curved lenses can be achieved through the die, and instability of manual operation is avoided.

Description

Technical Field

[0001] This utility model relates to a production and processing mold for eyeglass lenses, and more particularly to a production mold for free-form torus surface lenses, belonging to the field of eyeglass lens production technology. Background Technology

[0002] Traditional eyeglass lenses are based on rotationally symmetrical surface designs (spherical or aspherical). However, with increasing demands for lightweight, functional, comfortable, and innovative eyeglass lenses, traditional lenses can no longer meet the needs of the modern eyewear industry. Freeform surface technology based on digital surface treatment is revolutionizing the traditional lens manufacturing process. Due to their high degree of freedom, freeform lenses can control vertex power distribution and cylindrical vertex power distribution to the maximum extent according to human-defined requirements. Therefore, the application of freeform surfaces has become a major trend in eyewear optical design in recent years.

[0003] Chinese patent CN 114740634 B discloses a freeform torus lens based on an annular surface and its design method. The freeform torus lens disclosed in this patent has a horizontal curvature smaller than its vertical curvature, and each surface of the lens has two different radii of curvature at its center. Existing mass production processes for freeform torus lenses cannot meet the requirements. High-precision turning processes are typically used, which involve machining each substrate individually with high precision using a machining center. Therefore, this process suffers from low production efficiency, long production cycles, and high costs.

[0004] Currently, most eyeglass lenses are made of resin. The mass production process of resin lenses involves injecting a prepared liquid resin substrate into the cavity of a mold, heating and molding it, and then demolding it to obtain the resin lens substrate.

[0005] The injection mold for the resin lens consists of glass mold A and glass mold B with a standard concave curvature. The concave cavities of glass mold A and glass mold B are combined to form the injection cavity of the resin lens.

[0006] Currently, a small number of eyewear companies use molds to produce free-form torus lenses. However, the molds for free-form torus lenses, which have strict relative positional requirements for glass mold A and glass mold B, are assembled manually. This method of assembling molds based on human experience is not only inefficient but also affects the stability of lens quality, resulting in a low product qualification rate and material waste.

[0007] Chinese patent CN 113927835 B discloses a resin filling auxiliary device in the resin spectacle lens manufacturing process, which solves the problems of mold closing stability and injection efficiency between glass mold A and glass mold B. Because existing mass production processes do not have strict requirements on the orientation and relative position of glass mold A and glass mold B, existing mass production tooling cannot meet the needs of mass production of free-form torus lenses. Summary of the Invention

[0008] Purpose of the invention: The purpose of this utility model is to address the problems existing in the prior art by proposing a production mold for free-form torus lenses; it can realize the mass production of free-form torus lenses and improve production efficiency, lens qualification rate and lens quality stability.

[0009] Technical solution: A production mold for free-form toroidal surface lenses includes a concave mold, a convex mold, and a connecting sleeve. The concave mold and the convex mold have the same external dimensions and are in a disc-shaped structure, and are used in pairs. When the mold is closed, the concave mold and the convex mold are respectively fixedly fitted into the connecting sleeve. The concave mold, the convex mold, and the connecting sleeve are respectively provided with positioning devices.

[0010] This invention uses a positioning device to accurately position and restrict the movement of the die and punch within the connecting sleeve, thus fixing their relative positions and achieving relative stability. This allows for the mass production of free-form toroidal surface lenses using the mold, avoiding the instability of manual operation.

[0011] In a preferred embodiment, to improve positioning reliability and prevent misoperation, the number of positioning devices respectively provided between the die and the connecting sleeve is asymmetrically distributed along the circumferential surface.

[0012] The number of positioning devices between the die and the connecting sleeve and between the punch and the connecting sleeve can be the same or different, but the number can be one or more. By asymmetrically distributing them along the circumferential surface, the relative positions of the die and the punch in the connecting sleeve can be fixed respectively, which improves the reliability of positioning and the error prevention performance.

[0013] In a preferred embodiment, to achieve precise positioning, the positioning device includes a positioning protrusion protruding inward along the vertical direction on the inner side of the connecting sleeve, and positioning grooves matching the positioning protrusion are respectively provided on the outer diameters of the die and the punch in the vertical direction. The protrusion is directly machined into the connecting sleeve during manufacturing, enabling precise positioning and improving mold installation efficiency.

[0014] In a preferred embodiment, to improve the service life of the entire connecting sleeve and enhance the positioning quality, the positioning device includes a positioning post, a connecting groove recessed outward along the vertical direction on the inner side of the connecting sleeve, and positioning grooves matching the positioning protrusions respectively provided on the outer diameter of the die and the punch in the vertical direction; when the mold is closed, the inner walls of the positioning groove and the connecting groove fit against the outer wall of the positioning post.

[0015] During mold closing, the inner walls of the positioning groove and connecting groove fit snugly against the outer wall of the positioning pin, forming a circular hole. The positioning pin is then inserted into this hole for positioning. The interference fit between the positioning pin and the circular hole ensures reliable fixation of the die, punch, and connecting sleeve. When the old positioning pin wears down and the gap between the positioning groove, connecting groove, and the outer wall of the positioning pin becomes too large, affecting positioning stability, a new positioning pin can be replaced, thereby extending the service life of the entire connecting sleeve.

[0016] In a preferred embodiment, to achieve reliable positioning and fixation of the die and punch, and to protect them, the connecting sleeve is made of an elastic material; the positioning pin is made of a non-metallic material, and its hardness is between that of the connecting sleeve and the die or punch. The connecting sleeve is made of silicone, which has a certain degree of elasticity; the positioning pin is made of nylon, which has a certain strength; and the die and punch are typically made of glass, which is easily broken. Therefore, using these three materials can protect the relatively expensive die and punch, while the elasticity of the silicone connecting sleeve can improve the reliability of the connection between the die / punch and the connecting sleeve.

[0017] In a preferred embodiment, to achieve automatic coaxial alignment of the die and punch during mold closing, the outer diameters of the die and punch are conically fitted with the inner diameter of the connecting sleeve; the connecting sleeve is used to mount the conical cavities of the die and punch, with their small-diameter ends facing each other, and the central axes of the two conical cavities are coaxial. The two conical cavities with their small-diameter ends facing each other enable automatic coaxial alignment during mold closing, improving the quality of mold closing.

[0018] In a preferred embodiment, to precisely control the thickness and size of the lens, a limiting boss is provided between the cavities of the connecting sleeve and the mounting cavity of the die and punch. The limiting boss is located on the inner wall of the connecting sleeve and has a hollow annular structure. During mold closing, the ends of the die and punch respectively adhere to the upper and lower end faces of the limiting boss. Because the ends of the die and punch adhere to the upper and lower end faces of the limiting boss during mold closing, the hollow inner ring of the die, punch, and limiting boss forms a closed casting cavity. The thickness of the limiting boss corresponds to the required thickness of the lens to be produced, the size of the hollow inner ring corresponds to the required size of the lens to be produced, and the curved surface of the closing end of the die and punch corresponds to the curved surface of the lens to be produced. This improves the stability of product quality.

[0019] In a preferred embodiment, to further ensure the stability of mold closing, the connecting sleeve is provided with inwardly protruding limiting flanges at both ends. During mold closing, the limiting flanges engage with the end faces of the die and punch. During mold closing, the die and punch pass through the limiting flanges and are embedded in the connecting sleeve. Because the connecting sleeve is made of an elastic material such as silicone, the die and punch can be forcibly inserted into the corresponding cavities through compression. After installation, the limiting flanges reset, preventing the die or punch from falling out, thereby improving the stability of mold closing.

[0020] In a preferred embodiment, to improve the sealing of the casting cavity, the positioning column has a hollow structure, and a one-way valve is installed in the central hole of the positioning column; the central hole of the positioning column is connected to the inside and outside of the casting cavity through the one-way valve; the number of positioning devices is at least two, and the positioning column includes at least one one-way valve that flows from the outside to the inside and one one-way valve that flows from the inside to the outside.

[0021] Drilling holes in the locating pins and installing one-way valves in these holes avoids the need for holes in the connecting sleeve, ensuring the connecting sleeve's seal and thus improving the sealing of the casting cavity. At least two locating pins with one-way valves are required to ensure smooth resin filling.

[0022] In a preferred embodiment, to ensure that the resin can completely and quickly fill the casting cavity, a positioning post equipped with an outside-to-inside one-way valve and a positioning post equipped with an inside-to-outside one-way valve are located on opposite sides of the symmetrical plane of the connecting sleeve. By setting one-way valves with different flow directions on both sides of the connecting sleeve, it can be ensured that the resin can smoothly and quickly fill the entire casting cavity during casting, thereby improving product quality and yield.

[0023] Beneficial effects: This invention, through a positioning device, can accurately position and restrict the movement of the die and punch within the connecting sleeve, thus fixing their relative positions and achieving relative stability. This allows for the mass production of free-form torus surface lenses using molds, avoiding the instability of manual operation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is an assembly sectional view of the first embodiment of the present invention;

[0026] Figure 2 This is a partial top view of the first embodiment of the present invention;

[0027] Figure 3 This is a partial structural diagram of the die or punch of this utility model;

[0028] Figure 4 This is an assembly sectional view of the second embodiment of the present invention;

[0029] Figure 5 This is a partial top view of the connecting sleeve according to the second embodiment of the present invention;

[0030] Figure 6 This is an assembly sectional view of the third embodiment of the present utility model;

[0031] Figure 7 This is a schematic diagram of the punch structure according to the third embodiment of this utility model;

[0032] Figure 8 This is a schematic diagram of the connecting sleeve according to the third embodiment of the present utility model;

[0033] Figure 9 This is a schematic diagram of the structure of the concave mold according to the third embodiment of this utility model;

[0034] Figure 10 This is an assembly sectional view of the fourth embodiment of the present invention;

[0035] Figure 11 This is a cross-sectional view of the positioning column of this utility model. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example 1

[0039] like Figure 1 , 2 As shown in Figure 3, a production mold for a free-form torus lens includes a concave mold 1, a convex mold 2, and a connecting sleeve 3. The concave mold 1 and the convex mold 2 have the same external dimensions and are in a disc-shaped structure, and are used in pairs. When the mold is closed, the concave mold 1 and the convex mold 2 are respectively fixedly fitted into the connecting sleeve 3. The concave mold 1 and the convex mold 2 and the connecting sleeve 3 are respectively provided with positioning devices 4.

[0040] This invention uses a positioning device 4 to accurately position the concave mold 1 and the convex mold 2 within the connecting sleeve 3 and restrict their movement, thus fixing their relative positions within the sleeve 3. This allows for the mass production of free-form toroidal surface lenses using the mold, avoiding the instability of manual operation.

[0041] To improve positioning reliability and prevent misoperation, the positioning devices 4 provided between the die 1 and the punch 2 and the connecting sleeve 3 are asymmetrically distributed along the circumferential surface. The number of positioning devices 4 between the die 1 and the connecting sleeve 3 and between the punch 2 and the connecting sleeve 3 can be the same or different, and there can be one or more. By asymmetrically distributing them along the circumferential surface, the relative positions of the die 1 and the punch 2 within the connecting sleeve can be fixed respectively, improving positioning reliability and error prevention performance.

[0042] To achieve precise positioning, the positioning device 4 includes a positioning protrusion 41 that protrudes vertically inward from the inner side of the connecting sleeve 31. The outer diameters of the die 1 and the punch 2 are respectively provided with positioning grooves 42 that match the positioning protrusion 41 in the vertical direction. The protrusion 41 is directly machined into the connecting sleeve 3 during manufacturing, enabling precise positioning and improving mold installation efficiency.

[0043] like Figure 1 , 4As shown in Figures 6 and 10, to precisely control the thickness and size of the lens, a limiting boss 31 is provided between the cavities of the connecting sleeve 3 for mounting the concave mold 1 and the convex mold 2. The limiting boss 31 is located on the inner wall of the connecting sleeve 3 and has a hollow annular structure. During mold closing, the ends of the concave mold 1 and the convex mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31. Since the ends of the concave mold 1 and the convex mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31 during mold closing, the hollow inner ring of the concave mold 1, the convex mold 2, and the limiting boss 31 forms a closed casting cavity. The thickness of the limiting boss 31 is the thickness of the lens to be produced, the size of the hollow inner ring is the size of the lens to be produced, and the curved surface of the mold closing end of the concave mold 1 and the convex mold 2 is the curved surface of the lens to be produced. This improves the stability of product quality. Example 2

[0044] like Figure 3 , 4 As shown in Figure 5, a production mold for a free-form torus lens includes a concave mold 1, a convex mold 2, and a connecting sleeve 3. The concave mold 1 and the convex mold 2 have the same external dimensions and are in a disc-shaped structure, and are used in pairs. When the mold is closed, the concave mold 1 and the convex mold 2 are respectively fixedly fitted into the connecting sleeve 3. The concave mold 1 and the convex mold 2 and the connecting sleeve 3 are respectively provided with positioning devices 4.

[0045] This invention uses a positioning device 4 to accurately position the concave mold 1 and the convex mold 2 within the connecting sleeve 3 and restrict their movement, thus fixing their relative positions within the sleeve 3. This allows for the mass production of free-form toroidal surface lenses using the mold, avoiding the instability of manual operation.

[0046] To improve positioning reliability and prevent misoperation, the positioning devices 4 provided between the die 1 and the punch 2 and the connecting sleeve 3 are asymmetrically distributed along the circumferential surface. The number of positioning devices 4 between the die 1 and the connecting sleeve 3 and between the punch 2 and the connecting sleeve 3 can be the same or different, and there can be one or more. By asymmetrically distributing them along the circumferential surface, the relative positions of the die 1 and the punch 2 within the connecting sleeve can be fixed respectively, improving positioning reliability and error prevention performance.

[0047] In order to improve the service life of the entire connecting sleeve 3 and improve the positioning quality, the positioning device 4 includes a positioning post 43, a connecting groove 44 that is recessed outward along the vertical direction on the inner side of the connecting sleeve 3, and positioning grooves 42 that match the positioning protrusions 41 respectively on the outer diameter of the die 1 and the punch 2. When the mold is closed, the inner walls of the positioning grooves 42 and the connecting grooves 44 fit against the outer wall of the positioning post 43.

[0048] During mold closing, the inner walls of the positioning groove 42 and the connecting groove 44 fit against the outer wall of the positioning pin 43, forming a circular hole. The positioning pin 43 is then inserted into this hole for positioning. The interference fit between the positioning pin 43 and the circular hole ensures reliable fixation of the die 1, the punch 2, and the connecting sleeve 3. When the old positioning pin 43 wears down, the gap between the positioning groove 42 and the connecting groove 44 and the outer wall of the positioning pin 43 becomes too large, affecting positioning stability. In this case, a new positioning pin 43 can be replaced, thereby improving the service life of the entire connecting sleeve.

[0049] To ensure reliable positioning and fixation of the die 1 and punch 2, and to protect them, the connecting sleeve 3 is made of an elastic material; the positioning post 43 is made of a non-metallic material, and its hardness is between that of the connecting sleeve 3 and the die 1 or punch 2. The connecting sleeve 3 is made of silicone, which has a certain degree of elasticity; the positioning post 43 is made of nylon, which has a certain strength; the die 1 and punch 2 are usually made of glass, which is easily broken. Therefore, using the above three materials can protect the relatively expensive die 1 and punch 2, and the elasticity of the silicone connecting sleeve 3 can improve the reliability of the connection between the die 1 and punch 2 and the connecting sleeve 3.

[0050] like Figure 1 , 4 As shown in Figures 6 and 10, to precisely control the thickness and size of the lens, a limiting boss 31 is provided between the cavities of the connecting sleeve 3 for mounting the concave mold 1 and the convex mold 2. The limiting boss 31 is located on the inner wall of the connecting sleeve 3 and has a hollow annular structure. During mold closing, the ends of the concave mold 1 and the convex mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31. Since the ends of the concave mold 1 and the convex mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31 during mold closing, the hollow inner ring of the concave mold 1, the convex mold 2, and the limiting boss 31 forms a closed casting cavity. The thickness of the limiting boss 31 is the thickness of the lens to be produced, the size of the hollow inner ring is the size of the lens to be produced, and the curved surface of the mold closing end of the concave mold 1 and the convex mold 2 is the curved surface of the lens to be produced. This improves the stability of product quality.

[0051] like Figure 10 As shown, to improve the sealing of the casting cavity, the positioning post 43 has a hollow structure, and a one-way valve 45 is installed in the central hole of the positioning post 43. The central hole of the positioning post 43 connects the inside and outside of the casting cavity through the one-way valve 45. There are at least two positioning devices 4, and each positioning post 43 includes at least one one-way valve 45 that flows from the outside in and one one-way valve 45 that flows from the inside out. Making a hole in the positioning post 43 and installing a one-way valve 45 in the hole avoids making a hole in the connecting sleeve 3, ensuring the sealing of the connecting sleeve 3, and thus improving the sealing of the casting cavity. At least two positioning posts 43 with one-way valves 45 are required to achieve smooth resin filling.

[0052] To ensure that the resin can completely and quickly fill the casting cavity, positioning posts 43 equipped with one-way valves 45 that flow from the outside to the inside and one-way valves 45 that flow from the inside to the outside are located on opposite sides of the symmetrical plane of the connecting sleeve 3. By setting one-way valves 45 with different flow directions on both sides of the connecting sleeve 3, it can be ensured that the resin can smoothly and quickly fill the entire casting cavity during casting, thereby improving product quality and yield. Example 3

[0053] like Figure 6-9 As shown, to achieve automatic coaxial alignment of the die 1 and punch 2 during mold closing, the outer diameters of the die 1 and punch 2 are conically fitted with the inner diameter of the connecting sleeve 3. The connecting sleeve 3 is used to install the conical cavities of the die 1 and punch 2, with their smaller diameter ends facing each other, and the central axes of the two conical cavities are coaxial. The two conical cavities with their smaller diameter ends facing each other enable automatic coaxial alignment during mold closing, improving the quality of mold closing.

[0054] like Figure 1 , 4 As shown in Figures 6 and 10, to precisely control the thickness and size of the lens, a limiting boss 31 is provided between the cavities of the connecting sleeve 3 for mounting the concave mold 1 and the convex mold 2. The limiting boss 31 is located on the inner wall of the connecting sleeve 3 and has a hollow annular structure. During mold closing, the ends of the concave mold 1 and the convex mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31. Since the ends of the concave mold 1 and the convex mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31 during mold closing, the hollow inner ring of the concave mold 1, the convex mold 2, and the limiting boss 31 forms a closed casting cavity. The thickness of the limiting boss 31 is the thickness of the lens to be produced, the size of the hollow inner ring is the size of the lens to be produced, and the curved surface of the mold closing end of the concave mold 1 and the convex mold 2 is the curved surface of the lens to be produced. This improves the stability of product quality. Example 4

[0055] like Figure 10 As shown, to further ensure the stability of mold closing, the connecting sleeve 3 has inwardly protruding limiting flanges 32 at both ends. During mold closing, the limiting flanges 32 engage with the end faces of the die 1 and the punch 2. During mold closing, the die 1 and the punch 2 pass through the limiting flanges 32 and are embedded in the connecting sleeve 3. Since the connecting sleeve 3 is made of elastic silicone, the die 1 and the punch 2 can be forcibly inserted into the corresponding cavities by compression. After installation, the limiting flanges 32 reset, preventing the die 1 or the punch 2 from falling off, thereby improving the stability of mold closing.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A production mold for a free-form torus lens, comprising a concave mold (1), a convex mold (2), and a connecting sleeve (3), wherein the concave mold (1) and the convex mold (2) have the same external dimensions and are in a disc-shaped structure, and are used in pairs; when the mold is closed, the concave mold (1) and the convex mold (2) are respectively fixedly fitted into the connecting sleeve (3); characterized in that: The die (1) and punch (2) are respectively provided with positioning devices (4) and connecting sleeve (3); the positioning device (4) includes a positioning post (43), a connecting groove (44) that is recessed outward along the vertical direction on the inner side of the connecting sleeve (3), and positioning grooves (42) that match the positioning post (43) are respectively provided on the outer diameter of the die (1) and punch (2) in the vertical direction; when the mold is closed, the inner wall of the positioning groove (42) and the connecting groove (44) fits against the outer wall of the positioning post (43).

2. The production mold for free-form torus lenses according to claim 1, characterized in that: The positioning devices (4) respectively provided between the concave die (1) and the convex die (2) and the connecting sleeve (3) are asymmetrically distributed along the circumferential surface.

3. The production mold for free-form torus lenses according to claim 1, characterized in that: The connecting sleeve (3) is made of elastic material; the positioning post (43) is made of non-metallic material, and the hardness of the positioning post (43) is between the hardness of the connecting sleeve (3) and the hardness of the die (1) or the punch (2).

4. The production mold for free-form torus lenses according to claim 1, characterized in that: The outer diameter of the concave mold (1) and the outer diameter of the convex mold (2) are conically fitted with the inner diameter of the connecting sleeve (3); the connecting sleeve (3) is used to install the conical cavities of the concave mold (1) and the convex mold (2) with their small diameter ends facing each other, and the central axes of the two conical cavities are coaxial.

5. The production mold for free-form torus lenses according to claim 4, characterized in that: The connecting sleeve (3) is provided with a limiting boss (31) between the cavity of the die (1) and the punch (2). The limiting boss (31) is located on the inner wall of the connecting sleeve (3) and has a hollow ring structure. When the mold is closed, the ends of the die (1) and the punch (2) are respectively attached to the upper and lower end faces of the limiting boss (31).

6. The production mold for free-form torus lenses according to claim 5, characterized in that: The connecting sleeve (3) has inwardly protruding limiting flanges (32) at both ends. When the mold is closed, the limiting flanges (32) engage with the end faces of the die (1) and the punch (2).

7. The production mold for free-form torus lenses according to claim 1, characterized in that: The positioning column (43) is a hollow structure, and a one-way valve (45) is installed in the center hole of the positioning column (43); the center hole of the positioning column (43) is connected to the inside and outside of the casting cavity through the one-way valve (45); the number of positioning devices (4) is at least two, and the positioning column (43) includes at least one one-way valve (45) that is open from the outside to the inside and one one-way valve (45) that is open from the inside to the outside.

8. The production mold for free-form torus lenses according to claim 7, characterized in that: The positioning post (43) with an outward-to-inward one-way valve (45) and the positioning post (43) with an inward-to-outward one-way valve (45) are located on opposite sides of the symmetrical plane of the connecting sleeve (3).

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