Production mold for free ring curved lens

Abstract

The invention discloses a free ring curved lens production die which comprises a female die, a male die and a connecting sleeve, and the female die and the male die are the same in 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 positioning device has the beneficial effects that the positions of the female die and the male die in the connecting sleeve can be accurately positioned through the positioning device, changes of the female die and the male die can be limited, the positions of the female die and the male die in the connecting sleeve are relatively fixed, and then the positions of the female die and the male die are relatively fixed. 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] The present invention relates to a production and processing mold for spectacle lenses, in particular to a production mold for free toric lenses, and belongs to the technical field of spectacle lens production. Background Art

[0002] Traditional spectacle lenses are all designed based on rotationally symmetric surface shapes (spherical or aspherical). With the increasing requirements for lightweight, functionality, comfort, and novelty of ophthalmic lenses, traditional ophthalmic lenses can no longer meet the needs of the modern spectacle industry. The free-form surface technology based on digital surface treatment is revolutionizing the traditional lens manufacturing industry. Due to its large degree of freedom, free-form surface lenses can control the vertex power distribution and cylindrical vertex power distribution, etc., to the greatest extent according to the requirements set by humans. Therefore, the application of free-form surfaces has been a big hit in the field of ophthalmic optical design in recent years.

[0003] Chinese Patent CN 114740634 B discloses a free-form surface lens based on a toric surface and its design method. The free toric lens disclosed in this patent has a surface bend in the horizontal direction smaller than that in the vertical direction, and the center of the single surface of the lens has two different curvature radii. The existing mass production process for free toric lenses cannot be satisfied. Usually, a high-precision turning process is adopted. The turning process is to perform high-precision turning processing on each substrate through a machining center. Therefore, there are problems of low production efficiency, long cycle, and high cost.

[0004] Currently, most spectacle lenses are resin lenses. The mass production process of resin lenses is to inject the prepared liquid resin substrate into the cavity of the mold, and then demold after heating and forming to obtain the substrate of the resin lens.

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

[0006] Currently, there are also a small number of spectacle enterprises that use molds to produce free toric lenses. However, for free toric lens molds with strict relative position requirements for the glass mold A and the glass mold B during the production process, manual adjustment is used for mold closing. This method of mold closing and assembly relying on personnel experience not only has low efficiency, but also affects the quality stability of the lenses, resulting in a low product qualification rate and waste of materials.

[0007] Chinese Patent CN 113927835 B discloses an auxiliary device for resin filling in the production process of resin spectacle lenses, which solves the problems of the clamping stability and injection molding efficiency of glass mold A and glass mold B. Since the existing mass production process has no strict requirements on the direction and relative position of glass mold A and glass mold B, the existing mass production process tooling cannot meet the needs of mass production of free-form surface lenses. Summary of the Invention

[0008] Object of the Invention: The object of the present invention is to address the problems existing in the prior art and propose a production mold for free-form surface lenses, which can achieve the mass production of free-form surface lenses and improve the production efficiency, the qualified rate of lenses and the stability of lens quality.

[0009] Technical Solution: A production mold for free-form surface lenses includes a female mold, a male mold and a connecting sleeve. The female mold and the male mold have the same outer shape and are in a disc-shaped structure, and are used in pairs. When clamping the molds, the female mold and the male mold are respectively fixedly sleeved in the connecting sleeve. The female mold, the male mold and the connecting sleeve are respectively provided with positioning devices.

[0010] Through the positioning device of the present invention, the positions of the female mold and the male mold in the connecting sleeve can be accurately positioned and their movements can be restricted, so that the positions of the female mold and the male mold in the connecting sleeve are relatively fixed, and further the positional accuracy between the female mold and the male mold is relatively fixed. Furthermore, the purpose of mass production of free-form surface lenses can be achieved through the mold, avoiding the instability of manual operation.

[0011] Preferred Option: In order to improve the positioning reliability and prevent misoperation at the same time, the number of positioning devices respectively arranged between the female mold, the male mold and the connecting sleeve is asymmetrically distributed along the circumferential surface.

[0012] The number of positioning devices arranged between the female mold and the connecting sleeve and the number of positioning devices arranged between the male mold and the connecting sleeve can be the same or different, but the number can be one or more. By being asymmetrically distributed along the circumferential surface, the relative positions of the female mold and the male mold in the connecting sleeve can be respectively fixed, improving the positioning reliability and anti-error performance.

[0013] Preferred Option: In order to achieve precise positioning, the positioning device includes a positioning convex portion that protrudes inward vertically along the inner side of the connecting sleeve, and positioning grooves that match the positioning convex portion are respectively provided on the outer diameters of the female mold and the male mold in the vertical direction. The convex portion can be directly machined during the manufacturing process of the connecting sleeve, which can achieve precise positioning and improve the installation efficiency of the mold at the same time.

[0014] Preferred option: 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 that is concave inward from the inner side of the connecting sleeve along the vertical direction towards the outside, and positioning grooves are respectively provided on the outer diameters of the female die and the male die in the vertical direction to match the positioning protrusion parts; when the dies are closed, the inner walls of the positioning grooves and the connecting groove are in contact with the outer wall of the positioning post.

[0015] When the dies are closed, the inner walls of the positioning groove and the connecting groove are in contact with the outer wall of the positioning post, that is, the positioning groove and the connecting groove form a circular hole, and then the positioning post is inserted into the circular hole to achieve positioning. The interference fit between the positioning post and the circular hole can realize the reliable fixation of the female die and the male die to the connecting sleeve. When the old positioning post is worn and the gap between the positioning groove and the connecting groove and the outer wall of the positioning post is too large, affecting the positioning stability, a new positioning post can be replaced, thereby improving the service life of the entire connecting sleeve.

[0016] Preferred option: To achieve the reliable positioning and fixation of the female die and the male die, and at the same time protect the female die and the male die, the connecting sleeve is made of an elastic material; the positioning post is made of a non-metallic material, and the hardness of the positioning post is between the hardness of the connecting sleeve and the hardness of the female die or the male die. The connecting sleeve is made of silicone material and has a certain elasticity; the positioning post is made of nylon material with a certain strength; the female die and the male die are usually made of glass material and are easily broken; therefore, using the above three materials can protect the relatively expensive female die and male die, and at the same time, the silicone material connecting sleeve has a certain elasticity, which can improve the reliability of the connection between the female die and the male die and the connecting sleeve.

[0017] Preferred option: To achieve automatic coaxial alignment of the female die and the male die during the die closing process, the outer diameters of the female die and the male die are in conical surface fit with the inner diameter of the connecting sleeve; the small-diameter ends of the conical cavities for installing the female die and the male die in the connecting sleeve are arranged oppositely, and the central axes of the two conical cavities are coaxial. The automatic coaxial alignment during die closing can be achieved through the two conical cavities with opposite small-diameter ends, improving the die closing quality.

[0018] Preferred option: To precisely control the thickness and size of the lens, a limiting boss is provided between the cavities of the connecting sleeve for installing the female die and the male die. The limiting boss is located on the inner wall of the connecting sleeve and is a hollow annular structure; when the dies are closed, the end parts of the female die and the male die are respectively attached to the upper and lower end faces of the limiting boss. Since when the dies are closed, the end parts of the female die and the male die are respectively attached to the upper and lower end faces of the limiting boss, a closed casting cavity is formed by the female die, the male die and the hollow inner circle of the limiting boss. The thickness of the limiting boss is the thickness of the lens to be produced, the size of the hollow inner circle is the size of the lens to be produced, and the curved surfaces of the mating ends of the female die and the male die are the curved surfaces of the lens to be produced. The stability of the product quality is improved.

[0019] Preferred option: To further ensure the stability of mold clamping, limiting flanges protruding inward are respectively provided at both ends of the connecting sleeve. During mold clamping, the limiting flanges are clamped with the end faces of the female mold and the male mold. During mold clamping, the female mold and the male mold pass through the limiting flanges and are embedded in the connecting sleeve. Since the connecting sleeve is made of an elastic material such as silica gel, the female mold and the male mold can be forcibly inserted into the corresponding mold cavities by extrusion. After being installed in place, the limiting flanges reset, which can prevent the female mold or the male mold from falling off, thereby improving the stability of mold clamping.

[0020] Preferred option: To improve the sealing performance of the pouring cavity, the positioning post is a hollow structure, and a one-way valve is installed in the central hole of the positioning post; the central hole of the positioning post is communicated with the inside and outside of the pouring cavity through the one-way valve; the number of positioning devices is at least two, and at least one one-way valve conducting from the outside to the inside and one one-way valve conducting from the inside to the outside are included in the positioning posts.

[0021] Opening a hole in the positioning post and installing a one-way valve in the hole can avoid opening a hole in the connecting sleeve, ensure the sealing performance of the connecting sleeve, and thus improve the sealing performance of the pouring cavity. At least two positioning posts with one-way valves are required to achieve the smooth filling of the resin.

[0022] Preferred option: To ensure that the resin can completely and quickly fill the pouring cavity, the positioning post installed with a one-way valve conducting from the outside to the inside and the positioning post installed with a one-way valve conducting from the inside to the outside are respectively located on both sides of the symmetry plane of the connecting sleeve. By providing 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 pouring cavity during pouring, thereby improving the quality and qualification rate of the product.

[0023] Beneficial effects: Through the positioning device of the present invention, the positions of the female mold and the male mold in the connecting sleeve can be accurately positioned and their movements can be restricted, so that the positions of the female mold and the male mold in the connecting sleeve are relatively fixed, and thus the positional accuracy of the female mold and the male mold is relatively fixed. Furthermore, the purpose of batch production of free-form surface lenses can be achieved through the mold, avoiding the instability of manual operation. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0025] Figure 1 It is an assembly sectional view of the first embodiment of the present invention; Figure 2 It is a partial top view of the first embodiment of the present invention; Figure 3Schematic diagram of the local structure of the female or male die of the present invention; Figure 4 Assembly sectional view of the second embodiment of the present invention; Figure 5 Partial top view of the connecting sleeve of the second embodiment of the present invention; Figure 6 Assembly sectional view of the third embodiment of the present invention; Figure 7 Schematic diagram of the structure of the male die of the third embodiment of the present invention; Figure 8 Schematic diagram of the structure of the connecting sleeve of the third embodiment of the present invention; Figure 9 Schematic diagram of the structure of the female die of the third embodiment of the present invention; Figure 10 Assembly sectional view of the fourth embodiment of the present invention; Figure 11 Sectional view of the positioning post of the present invention. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature. Embodiment 1

[0029] As shown Figure 1 , 2 and 3, a production mold for a free-form surface lens includes a female mold 1, a male mold 2 and a connecting sleeve 3. The female mold 1 and the male mold 2 have the same external dimensions and are in a disc-shaped structure, and are used in pairs. When the molds are closed, the female mold 1 and the male mold 2 are respectively fixedly sleeved in the connecting sleeve 3. The female mold 1, the male mold 2 and the connecting sleeve 3 are respectively provided with positioning devices 4.

[0030] Through the positioning device 4 of the present invention, the positions of the female mold 1 and the male mold 2 in the connecting sleeve 3 can be accurately positioned and their movements can be restricted, so that the positions of the female mold 1 and the male mold 2 in the connecting sleeve 3 are relatively fixed, and further the positional accuracy of the female mold 1 and the male mold 2 is relatively fixed. Furthermore, the purpose of batch production of free-form surface lenses can be achieved through the mold, avoiding the instability of manual operation.

[0031] In order to improve the positioning reliability and prevent misoperation at the same time, the positioning devices 4 respectively arranged between the female mold 1, the male mold 2 and the connecting sleeve 3 are asymmetrically distributed along the circumferential surface. The number of the positioning devices 4 arranged between the female mold 1 and the connecting sleeve 3 and the number of the positioning devices 4 arranged between the male mold 2 and the connecting sleeve 3 can be the same or different, but the number can be one or more. By being asymmetrically distributed along the circumferential surface, the relative positions of the female mold 1 and the male mold 2 in the connecting sleeve can be respectively fixed, improving the positioning reliability and anti-mistake performance.

[0032] In order to achieve precise positioning, the positioning device 4 includes a positioning protrusion 41 that protrudes inward vertically along the inner side of the connecting sleeve 31. The outer diameters of the female mold 1 and the male mold 2 are respectively provided with positioning grooves 42 that match the positioning protrusion 41. The protrusion 41 can be directly machined on the connecting sleeve 3 during the manufacturing process, which can achieve precise positioning and improve the installation efficiency of the mold at the same time.

[0033] As shown Figure 1 , 4 , 6 and 10, in order 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 installing the female mold 1 and the male mold 2. The limiting boss 31 is located on the inner wall of the connecting sleeve 3 and is in a hollow annular structure. When the molds are closed, the end parts of the female mold 1 and the male mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31. Since when the molds are closed, the end parts of the female mold 1 and the male mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31, a closed casting cavity is formed by the female mold 1, the male mold 2 and the hollow inner circle of the limiting boss 31. The thickness of the limiting boss 31 is the thickness of the lens to be produced, the size of the hollow inner circle is the size of the lens to be produced, and the curved surfaces of the mating ends of the female mold 1 and the male mold 2 are the curved surfaces of the lens to be produced. The stability of the product quality is improved. Embodiment 2

[0034] As shownFigure 3 , 4 As shown in FIGS. 1 and 5, a production mold for a free-form surface lens includes a female mold 1, a male mold 2 and a connecting sleeve 3. The female mold 1 and the male mold 2 have the same external dimensions and are in a disc-shaped structure, and are used in pairs. When the molds are closed, the female mold 1 and the male mold 2 are respectively fixedly sleeved in the connecting sleeve 3. The female mold 1, the male mold 2 and the connecting sleeve 3 are respectively provided with a positioning device 4.

[0035] Through the positioning device 4 of the present invention, the positions of the female mold 1 and the male mold 2 in the connecting sleeve 3 can be accurately positioned and their movements can be restricted, so that the positions of the female mold 1 and the male mold 2 in the connecting sleeve 3 are relatively fixed, and further the positional accuracy of the female mold 1 and the male mold 2 is relatively fixed. Furthermore, the purpose of batch production of free-form surface lenses can be achieved through the mold, and the instability of manual operation can be avoided.

[0036] In order to improve the positioning reliability and prevent misoperation, the positioning devices 4 respectively provided between the female mold 1, the male mold 2 and the connecting sleeve 3 are asymmetrically distributed along the circumferential surface. The number of the positioning devices 4 provided between the female mold 1 and the connecting sleeve 3 and the number of the positioning devices 4 provided between the male mold 2 and the connecting sleeve 3 may be the same or different, but the number may be one or more. By being asymmetrically distributed along the circumferential surface, the relative positions of the female mold 1 and the male mold 2 in the connecting sleeve can be respectively fixed, and the positioning reliability and anti-error performance are improved.

[0037] 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 inward from the inner side of the connecting sleeve 3 in the vertical direction, and positioning grooves 42 that are respectively provided on the outer diameters of the female mold 1 and the male mold 2 in the vertical direction and match the positioning protrusion parts 41. When the molds are closed, the inner walls of the positioning grooves 42 and the connecting groove 44 are attached to the outer wall of the positioning post 43.

[0038] When the molds are closed, the inner walls of the positioning grooves 42 and the connecting groove 44 are attached to the outer wall of the positioning post 43, that is, the positioning grooves 42 and the connecting groove 44 form a circular hole, and then the positioning post 43 is inserted into the circular hole to achieve positioning. The interference fit between the positioning post 43 and the circular hole can realize the reliable fixation of the female mold 1, the male mold 2 and the connecting sleeve 3. When the old positioning post 43 is worn and the gap between the positioning grooves 42, the connecting groove 44 and the outer wall of the positioning post 43 is too large to affect the positioning stability, a new positioning post 43 can be replaced, thereby improving the service life of the entire connecting sleeve.

[0039] To achieve the reliable positioning and fixation of the female mold 1 and the male mold 2, and at the same time protect the female mold 1 and the male mold 2, the connecting sleeve 3 is made of an elastic material; the positioning post 43 is made of a 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 female mold 1 or the male mold 2. The connecting sleeve 3 is made of silica gel material and has a certain elasticity; the positioning post 43 is made of nylon material with a certain strength; the female mold 1 and the male mold 2 are usually made of glass material and are easily broken; therefore, the above three materials can protect the relatively expensive female mold 1 and male mold 2, and at the same time, the silica gel material connecting sleeve 3 has a certain elasticity, which can improve the connection reliability between the female mold 1 and male mold 2 and the connecting sleeve 3.

[0040] As Figure 1 , 4 , 6 and 10 show that in order to accurately control the thickness and size of the lens, a limiting boss 31 is provided between the cavities of the connecting sleeve 3 for installing the female mold 1 and the male mold 2. The limiting boss 31 is located on the inner wall of the connecting sleeve 3 and has a hollow annular structure; when the molds are closed, the end parts of the female mold 1 and the male mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31. Since when the molds are closed, the end parts of the female mold 1 and the male mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31, a closed casting cavity is formed by the female mold 1, the male mold 2 and the hollow inner circle of the limiting boss 31. The thickness of the limiting boss 31 is the thickness of the lens to be produced, the size of the hollow inner circle is the size of the lens to be produced, and the curved surface of the mold-closing ends of the female mold 1 and the male mold 2 is the curved surface of the lens to be produced. The stability of the product quality is improved.

[0041] As Figure 10 shows, in order to improve the sealing performance of the casting cavity, the positioning post 43 is of 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 is communicated with the inside and outside of the casting cavity through the one-way valve 45; the number of the positioning devices 4 is at least two, and at least one one-way valve 45 that conducts from the outside to the inside and one one-way valve 45 that conducts from the inside to the outside are included in the positioning post 43. Opening a hole in the positioning post 43 and installing a one-way valve 45 in the hole can avoid opening a hole in the connecting sleeve 3, ensure the sealing performance of the connecting sleeve 3, and further improve the sealing performance of the casting cavity. At least two positioning posts 43 with one-way valves 45 are required to achieve the smooth filling of the resin.

[0042] To ensure that the resin can completely and quickly fill the casting cavity, the positioning post 43 with a one-way valve 45 that conducts from the outside to the inside and the positioning post 43 with a one-way valve 45 that conducts from the inside to the outside are respectively located on both sides of the symmetry plane of the connecting sleeve 3. By separately arranging 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 pouring, and further improve the quality and qualification rate of the product. Embodiment Three

[0043] As Figures 6 - 9As shown in the figure, in order to achieve automatic coaxial alignment of the female mold 1 and the male mold 2 during the mold closing process, the outer diameters of the female mold 1 and the male mold 2 are in conical surface fit with the inner diameter of the connecting sleeve 3; the connecting sleeve 3 is used to install the small-diameter ends of the conical cavities of the female mold 1 and the male mold 2 to be arranged oppositely, and the central axes of the two conical cavities are coaxial. Through the two conical cavities with the small-diameter ends arranged oppositely, automatic coaxial alignment can be achieved during mold closing, improving the mold closing quality.

[0044] As Figure 1 , 4 , 6 and 10 shown, in order 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 installing the female mold 1 and the male 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 end parts of the female mold 1 and the male mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31. Since during mold closing, the end parts of the female mold 1 and the male mold 2 are respectively attached to the upper and lower end faces of the limiting boss 31, a closed casting cavity is formed by the hollow inner rings of the female mold 1, the male mold 2 and the limiting boss 31. 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 surfaces of the mold closing ends of the female mold 1 and the male mold 2 are the curved surfaces of the lens to be produced. The stability of the product quality is improved. Embodiment Four

[0045] As Figure 10 shown, in order to further ensure the stability of mold closing, limiting flanges 32 protruding inward are respectively provided at both ends of the connecting sleeve 3. During mold closing, the limiting flanges 32 are clamped with the end faces of the female mold 1 and the male mold 2. During mold closing, the female mold 1 and the male mold 2 pass through the limiting flanges 32 and are embedded in the connecting sleeve 3. Since the connecting sleeve 3 is made of an elastic material such as silica gel, the female mold 1 and the male mold 2 can be forcibly inserted into the corresponding cavities by extrusion. After being installed in place, the limiting flanges 32 are reset, which can prevent the female mold 1 or the male mold 2 from falling off, thereby improving the stability of mold closing of the mold.

[0046] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0047] The foregoing description of the disclosed embodiments enables those skilled in the art to practice 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. Thus, the present invention is not intended 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 toroidal surface 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 outer dimensions and are in a round pancake-shaped structure, and are used in pairs; when the molds are closed, the concave mold (1) and the convex mold (2) are respectively fixedly sleeved in the connecting sleeve (3); the characteristics are: The female die (1), the male die (2) and the connecting sleeve (3) are respectively provided with positioning devices (4).

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

3. The production mold for the free-form annular curved lens according to claim 1, characterized in that: The positioning device (4) comprises a positioning protrusion (41) protruding inwardly along the vertical direction on the inner side of the connecting sleeve (3), and positioning grooves (42) matching the positioning protrusion (41) are respectively provided in the vertical direction on the outer diameters of the concave mold (1) and the convex mold (2).

4. The production mold for the free-form annular curved lens according to claim 1, characterized in that: The positioning device (4) comprises a positioning column (43), a connecting groove (44) on the inner side of the connecting sleeve (3) which is concave outward along the vertical direction, and positioning grooves (42) matching the positioning protrusions (41) are respectively provided in the vertical direction on the outer diameters of the concave mold (1) and the convex mold (2); when the molds are closed, the inner walls of the positioning groove (42) and the connecting groove (44) are in contact with the outer wall of the positioning column (43).

5. The production mold for the free-form annular curved lens according to claim 4, characterized in that: The connecting sleeve (3) is made of elastic material; the positioning column (43) is made of non-metallic material, and the hardness of the positioning column (43) is between the hardness of the connecting sleeve (3) and the hardness of the concave die (1) or the convex die (2).

6. The production mold for the free-form annular curved lens according to claim 1, characterized in that: The outer diameters of the concave die (1) and the convex die (2) match the inner diameter of the connecting sleeve (3) in a conical surface; the connecting sleeve (3) is used to install the conical cavities of the concave die (1) and the convex die (2), the small diameter ends of which are arranged opposite to each other, and the central axes of the two conical cavities are coaxial.

7. The production mold for the free-form annular curved lens according to claim 1 or 6, characterized in that: The connection sleeve (3) is used to install a limiting boss (31) between the cavity of the concave die (1) and the punch (2); the limiting boss (31) is located on the inner wall of the connection sleeve (3) and is in a hollow annular structure; when the molds are closed, the ends of the concave die (1) and the punch (2) are respectively attached to the upper and lower end surfaces of the limiting boss (31).

8. The production mold for the free-form annular curved lens according to claim 7, characterized in that: The two ends of the connecting sleeve (3) are respectively provided with limiting flanges (32) protruding inwards. When the mold is closed, the limiting flanges (32) are clamped with the end faces of the concave mold (1) and the punch (2).

9. The production mold for the free-form annular curved lens according to claim 4, 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) communicates with the inside and outside of the casting cavity through the one-way valve (45); the number of the positioning devices (4) is at least two, and the positioning column (43) includes at least one one-way valve (45) that conducts from the outside to the inside and one one-way valve (45) that conducts from the inside to the outside.

10. The production mold for the free-form annular curved lens according to claim 9, characterized in that: A positioning column (43) equipped with a one-way valve (45) conducting from outside to inside and a positioning column (43) equipped with a one-way valve (45) conducting from inside to outside are respectively located on both sides of the symmetric surface of the connecting sleeve (3).

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