CN2799212Y - Die for molding lens - Google Patents

Abstract

The utility model relates to a die for molding lenses, which comprises a first die core, a second die core and a positioning mechanism, wherein the second die core and the first die core are arranged in a coaxial way, and are matched mutually to form a molding cavity; the positioning mechanism is arranged on the second die core, and comprises an electric body and a separating ring; the elastic body is arranged between the second die core and the separating ring; the separating ring has a positioning curved surface. When the utility model is used for forming, the compression of a preforming body is uniform, thereby, the forming accuracy is improved and the operation is convenient.

Description

Molding Lens Molds

【Technical field】

The utility model relates to a mold, in particular to a lens molding mold.

【Background technique】

The existing molding lens mold is composed of the first mold core, the second mold core and the body. During the molding process, the preform is directly placed on the surface of the mold core of the second mold core, and the lens preform is softened by high temperature and pressurized. Make it deform to the shape of the mold core and become the required molded lens. There are many shapes of preforms, generally there are two types of spherical (Ball) and round cake (Gob). The spherical preform has a completely symmetrical geometric shape. When it is directly placed on the mold, it can be automatically centered under the action of gravity. There will be no deflection of the preform. However, spherical preforms are not easy to process into lenses, especially for aspheric lenses that can reduce aberrations, it is relatively difficult to process spherical preforms, while disc preforms are relatively easy to process into lenses, so in actual production It is often used in China, because the round cake-shaped preform is only symmetrical to a specific axis, and it is prone to deflection when placed directly on the surface of the second mold core, so that the pressure is uneven during molding, resulting in poor molding or poor molding accuracy. In severe cases, it even leads to product scrapping.

In view of the above-mentioned deficiencies in the prior art, a mold for molding a lens is provided which uses a positioning mechanism to precisely position the preform so as to improve the molding accuracy.

【Content of utility model】

The purpose of the utility model is to provide a molding lens mold with accurate preform positioning and high molding precision.

In order to achieve the above purpose, the utility model provides a lens mold, which includes a first mold core, a second mold core and a positioning mechanism. The second mold core and the first mold core are coaxially arranged and cooperate with each other to form a molding cavity; the positioning mechanism is arranged on the second mold core, which includes an elastic body and a separating ring, and the elastic body is placed on the second mold core. Between the mold core and the separation ring, the separation ring has a positioning curved surface.

The utility model utilizes the positioning curved surface on the separation ring of the positioning mechanism and the pressing down of the first mold core to fully align the preform before forming, and this process does not require manual adjustment, and the preform can be automatically placed directly on the positioning mechanism. Alignment, so as to avoid the uneven stress caused by the deflection of the preform, improve the forming accuracy, and be convenient to use.

【Description of drawings】

Fig. 1 is the three-dimensional exploded schematic view of the molded lens mold of the utility model;

Fig. 2 is the three-dimensional assembly diagram of the molded lens mold of the utility model;

Fig. 3 is a schematic sectional view of the utility model molded lens mold;

Fig. 4 is a schematic diagram of the preform positioning process of the molded lens mold of the present invention;

Fig. 5 is a schematic diagram of the forming process of the molded lens mold of the present invention;

Fig. 6 is a schematic diagram of the finished molding of the preferred embodiment of the utility model.

【Detailed ways】

Please refer to FIG. 1 and FIG. 2 , the lens mold of the present invention mainly includes: a first body 10 , a first mold core 20 , a second body 30 , a second mold core 40 and a positioning mechanism 50 .

The first body 10 is hollow cylindrical, including a body 101, a mold core hole 102 and a flange portion 103, the first mold core 20 is accommodated in the first body 10 through the mold core hole 102, and can be placed in the first body 10 during forming. It moves up and down.

The first mold core 20 comprises a mold core body 201, the material of the mold core body 201 is tungsten carbide (WC), one end is provided with a flange 2011, and the other end is provided with a mold cavity 2012 (referring to Fig. 3), and this mold cavity 2012 includes A molding surface (not shown), the molding surface is provided with a protective film (not shown), the material of which can be noble metal film or boron nitride (BN) film.

The second body 30 is a hollow cylinder, including a body 301, a mold core hole 302, and a flange portion 303. The flange portion 303 offers a mounting hole 3011 adjacent to the position of the body 301, which communicates with the mold core hole 302. When the second mold core 40 is installed in the mold core hole 302, a cylinder 3012 is placed in the installation hole 3011 to fix the second mold core 40 in the second body 30, the flange portion of the second body 30 The inner wall of 303 defines a first annular groove 3021 adjacent to the end and a second annular groove 3022 adjacent to the circumference of the first annular groove 3021 (see FIG. 3 ).

The second mold core 40 is arranged coaxially with the first mold core 20, and is fixed in the second body 30. It includes a mold core body 401. The material of the mold core body 401 is tungsten carbide (WC), and one end is also provided with a convex Edge 4011, which can cooperate with the first annular groove 3021 of the core hole 302 of the second body 30, and the other end is provided with a stepped portion 4012, and a fixing hole corresponding to the mounting hole 3011 is provided at the position of the core body 401 adjacent to the flange 4011 402, the fixing hole 402 is used to cooperate with the cylinder 3012, and is used to fix the second mold core 40 in the first body 30. The center of the stepped part 4012 is a boss 4013, and the boss 4013 and the positioning mechanism 50 form a type Cavity 4014 (see FIG. 3 ), a molding surface (not shown) is provided on the top of the boss 4013, and a protective film (not shown) is provided on the molding surface, and its material can be a noble metal film or a boron nitride (BN) film.

Please refer to the third figure at the same time, the positioning mechanism 50 is arranged on the stepped portion 4012 of the second mold core 40, and is composed of an elastic body 51 and a separation ring 52. The elastic body 51 is a compression spring, which can also be a stretchable elastic body. One end is fixed on the stepped portion 4012 of the second mold core 40 , and the other end abuts against the separation ring 52 . The separation ring 52 is a hollow cylinder made of a stronger material, such as steel, on which a stepped hole 521 and a positioning curved surface 522 are provided, and the boss 4013 of the second mold core 40 can move up and down in the stepped hole 521 , and in the natural state, the molding surface at the top of the boss 4013 of the second mold core 40 is at the lower end of the positioning curved surface 522 . The positioning curved surface 522 is set according to the radius of curvature of the contour of the preform, and requires high precision and hardness, and can be subjected to surface quenching after processing. In addition, an ultrasonic vibrator can also be added to the stepped part 4012 to generate ultrasonic vibration through the ultrasonic vibrator, thereby driving the spring to vibrate, so that the preform can be more accurately positioned on the mold core, and the separation ring 52 can be returned to its position in time .

Please refer to Fig. 4, Fig. 5 and Fig. 6, when in use, place the preform 60 on the separation ring 52 of the positioning mechanism 50, then press down the first mold core 20, so that the elastic body 51 shrinks and drives the positioning mechanism 50 to retreat, and the preform The body 60 moves downward together with the positioning mechanism 51. Since the positioning curved surface 522 is set according to the radius of curvature of the contour of the pre-shaped body, during the pressing process of the first mold core 20, the elastic force of the elastic body 51 and the pressure of the first mold core 20 will Accurately locate the predetermined positions of the first mold core 20 and the second mold core 40, thereby completing the positioning work. After positioning, the first mold core 20 continues to be pressed down, the elastic body 51 is compressed, and the pressure is significantly increased compared with the positioning, and then the preform 60 is pressurized under high temperature conditions, so that it is compressed and deformed to the shape of the mold core, becoming For the required molded lens, after the molded lens is formed, the first mold core 20 retreats. At this time, the elastic body 51 pushes up the separating ring 52 under the action of elastic restoring force, so that the molded lens is separated from the mold core, and the molded lens is taken out from the mold core. This completes the molding process, thereby achieving the purpose of improving molding accuracy.

It can be understood that both the first body 10 and the second body 40 can be omitted, and the desired effect can also be achieved only through the cooperation of the first mold core 20 and the second mold core 30 .

Claims (10)

1. A molded lens mold, comprising a first mold core and a second mold core, the second mold core and the first mold core are arranged coaxially and cooperate with each other to form a molding cavity, characterized in that: the molded lens mold further includes A positioning mechanism, the positioning mechanism is arranged on the second mold core, which includes an elastic body and a separation ring, the elastic body is placed between the second mold core and the separation ring, and the separation ring has a positioning curved surface. 2. The molded lens mold according to claim 1, characterized in that: the molded lens mold further comprises a first body, the first body is a hollow cylinder, the first body includes a core hole and a flange part, the first mold core is accommodated in the first body through the mold core hole. 3. The molded lens mold according to claim 1, characterized in that: the molded lens mold further comprises a second body, the second body is hollow cylindrical, the second body includes a body, wherein the center of the body It is a core hole, the end of the fuselage is a flange, and the second core is accommodated in the second body through the core hole. 4 . The lens mold as claimed in claim 3 , wherein a first annular groove is formed on the inner wall of the flange portion adjacent to the end portion, and a second annular groove is circumferentially formed adjacent to the first annular groove. 5 . The lens mold as claimed in claim 4 , wherein the second body is provided with a circular mounting hole adjacent to the second annular groove, and the mounting hole fits with a cylinder. 6 . 6 . The mold for molded lenses according to claim 1 , wherein the first mold core comprises a mold core body, the material of the mold core body is tungsten carbide (WC), and a flange is provided at one end thereof. 7. The lens mold for molding according to claim 1, wherein the second mold core comprises a mold core body, one end of which is provided with a flange, and the other end is provided with a stepped portion, and the positioning mechanism is arranged on the stepped portion. department. 8. The molding lens mold according to claim 7, characterized in that: the center of the stepped portion is a convex column, the cavity of the second mold core is set on the convex column, and the convex column also includes a molding A protective film is provided on the molding surface. 9 . The lens mold as claimed in claim 8 , wherein the separation ring is a hollow cylinder, and a stepped hole is arranged in the center thereof, and the protrusion can slide in the stepped hole. 10 . 10. The lens mold for molding as claimed in claim 1, wherein the elastic body is a stretchable elastic body.

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