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CN-224210348-U - Production mould of free-form annular curved surface lens

CN224210348UCN 224210348 UCN224210348 UCN 224210348UCN-224210348-U

Abstract

The utility model discloses a production die for a free-form curved surface lens, which comprises a female die, a male die and a connecting sleeve, wherein the female die and the male die are in a round cake-shaped structure with the same external dimensions and are used in pairs, the female die and the male die are respectively fixedly sleeved in the connecting sleeve during die assembly, and the female die and the male die 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 and the change of the positions can be limited by the positioning device, so that the positions of the female die and the male die in the connecting sleeve are relatively fixed, and the position degree of the female die and the male die is relatively fixed. And the purpose of mass production of free-form curved lenses can be realized through the die, so that instability of manual operation is avoided.

Inventors

  • JIAO FEIHONG
  • JIANG JUNPING
  • WANG HAO
  • XUE HONGHUI
  • ZHANG FEIFEI

Assignees

  • 江苏汇鼎光学眼镜有限公司

Dates

Publication Date
20260508
Application Date
20250312

Claims (8)

  1. 1. The production die for the free-form curved-surface lens comprises a female die (1), a male die (2) and a connecting sleeve (3), wherein the female die (1) and the male die (2) are in a round cake-shaped structure with the same outline dimension and are used in pairs, the female die (1) and the male die (2) are respectively fixedly sleeved in the connecting sleeve (3) during die assembly, and the production die is characterized in that the female die (1) and the male die (2) are respectively provided with a positioning device (4) with the connecting sleeve (3), the positioning device (4) comprises a positioning column (43), a connecting groove (44) which is concave inwards in the inner side of the connecting sleeve (3) along the vertical direction, a positioning groove (42) which is matched with the positioning column (43) is respectively arranged in the outer diameter vertical direction of the female die (1) and the male die (2), and the inner wall of the connecting groove (44) is attached to the outer wall of the positioning column (43) during die assembly.
  2. 2. The production mold for free-form curved lenses according to claim 1, wherein the positioning devices (4) respectively arranged between the female mold (1) and the male mold (2) and between the connecting sleeve (3) are distributed asymmetrically along the circumferential surface.
  3. 3. The production mold for free-form curved lenses according to claim 1, wherein the connecting sleeve (3) is made of an elastic material, the positioning column (43) is made of a nonmetallic material, and the hardness of the positioning column (43) is between the hardness of the connecting sleeve (3) and the hardness of the female mold (1) or the male mold (2).
  4. 4. The production die for the free-form curved surface lens, which is disclosed in claim 1, is characterized in that the outer diameter of the female die (1) and the outer diameter of the male die (2) are in conical surface fit with the inner diameter of the connecting sleeve (3), the connecting sleeve (3) is used for installing conical cavity small diameter ends of the female die (1) and the male die (2) which are oppositely arranged, and central shafts of the two conical cavities are coaxial.
  5. 5. The production mold for the free-form curved surface lenses according to claim 4, wherein the connecting sleeve (3) is used for installing a limiting boss (31) between cavities of the female mold (1) and the male mold (2), the limiting boss (31) is positioned on the inner wall of the connecting sleeve (3) and is of a hollow annular structure, and when the mold is closed, the ends of the female mold (1) and the male mold (2) are respectively attached to the upper end face and the lower end face of the limiting boss (31).
  6. 6. The mold for producing free-form curved surface lenses according to claim 5, wherein the two ends of the connecting sleeve (3) are respectively provided with a limiting flange (32) protruding inwards, and the limiting flanges (32) are clamped with the end surfaces of the female mold (1) and the male mold (2) when the mold is closed.
  7. 7. The production die for the free-form curved surface lens, which is disclosed in claim 1, is characterized in that the positioning column (43) is of a hollow structure, a one-way valve (45) is arranged in a central hole of the positioning column (43), the central hole of the positioning column (43) is communicated with the inside and the outside of a casting cavity through the one-way valve (45), the number of the positioning devices (4) is at least two, and the positioning column (43) at least comprises one-way valve (45) which is communicated from outside to inside and one-way valve (45) which is communicated from inside to outside.
  8. 8. The mold for producing free-form curved lenses according to claim 7, wherein the positioning column (43) provided with the one-way valve (45) which is conducted from outside to inside and the positioning column (43) provided with the one-way valve (45) which is conducted from inside to outside are respectively positioned at both sides of the symmetry plane of the connecting sleeve (3).

Description

Production mould of free-form annular curved surface lens Technical Field The utility model relates to a production and processing die for spectacle lenses, in particular to a production die for free-form curved lenses, and belongs to the technical field of production of spectacle lenses. Background Traditional ophthalmic lenses are designed based on rotationally symmetrical surfaces (spherical or aspherical surfaces), and as the requirements of people on ophthalmic lenses such as light weight, functionality, comfort and novelty are improved, the traditional ophthalmic lenses cannot meet the requirements of the modern spectacles industry. Free-form surface technology based on digital surface treatments is evolving over the traditional lens manufacturing industry. Because of its large degree of freedom, the free-form surface lens can control the power distribution of the vertex and the power distribution of the cylinder lens to the maximum extent according to the requirements set by people, so the application of the free-form surface is a great popularity in the field of optical design of spectacles in recent years. Chinese patent CN 114740634B discloses a free-form surface lens based on toroidal surface and its design method, the free-form surface lens disclosed in the patent has a horizontal surface curvature smaller than a vertical surface curvature, and the center of a single surface of the lens has two different curvature radii. The existing mass production process of free-ring curved lenses cannot be met, a high-precision turning process is generally adopted, and the turning process is to carry out one-by-one high-precision turning processing through a processing center on the basis of a substrate, so that the problems of low production efficiency, long period and high cost exist. At present, the eyeglass lenses are basically resin lenses, and the mass production process of the resin lenses is to inject the prepared liquid resin base material into a shape cavity of a mould, and then to obtain the base material of the resin lenses by demoulding after heating and forming. The injection mold of the resin lens is a glass mold A and a glass mold B with standard concave radian, and the concave cavities of the glass mold A and the glass mold B are combined to form an injection molding cavity of the resin lens. At present, a small number of eyeglass enterprises adopt molds to produce free-form curved lenses, but in the production process, the free-form curved lenses with strict relative position requirements on the glass mold A and the glass mold B are assembled by adopting a manual adjustment mode. The mode of assembling the mold by means of personnel experience is low in efficiency, quality stability of lenses can be affected, product qualification rate is low, and material waste is caused. Chinese patent CN 113927835B discloses a resin filling auxiliary device in the production process of resin spectacle lenses, which solves the problems of the mold closing stability and injection molding efficiency of glass mold a and glass mold B. Because the existing batch production process has no strict requirements on the direction and the relative position of the glass mold A and the glass mold B, the existing batch production process tool cannot meet the requirement of batch production of free-form curved lenses. Disclosure of Invention The utility model aims to solve the problems in the prior art, and provides a production die for free-form curved lenses, which can realize mass production of the free-form curved lenses and improve the production efficiency, the lens qualification rate and the lens quality stability. The production die for the free-form curved surface lens comprises a female die, a male die and a connecting sleeve, wherein the female die and the male die are in a round cake-shaped structure with the same overall dimension and are used in pairs, the female die and the male die are respectively fixedly sleeved in the connecting sleeve during die assembly, and positioning devices are respectively arranged on the female die and the male die and the connecting sleeve. According to the utility model, the positions of the female die and the male die in the connecting sleeve can be accurately positioned and the change of the positions 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 position degree of the female die and the male die is relatively fixed. And the purpose of mass production of free-form curved lenses can be realized through the die, so that instability of manual operation is avoided. In order to improve positioning reliability and prevent misoperation, the number of positioning devices respectively arranged between the female die and the male die and between the female die and the connecting sleeve are distributed asymmetrically along the circumferential surface. The number of the posi