CN215750497U

CN215750497U - High-precision injection mold for optical lens

Info

Publication number: CN215750497U
Application number: CN202122242494.2U
Authority: CN
Inventors: 李荣洲; 谭沿河; 姚雅兰
Original assignee: Dongguan Jingcai Optics Co ltd
Current assignee: Dongguan Jingcai Optics Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-02-08
Anticipated expiration: 2031-09-15

Abstract

The utility model relates to the technical field of lens processing, in particular to a high-precision injection mold of an optical lens, which comprises an upper mold and a lower mold, wherein the upper mold and the lower mold are provided with corresponding injection molding cavities, and the upper mold is provided with an injection molding channel; go up all to be provided with pneumatic unloading subassembly on mould and the bed die, pneumatic unloading subassembly is including having a certain tapered inner chamber that has of lining up mould and bed die, the opening that the chamber was located is moulded plastics to the inner chamber intercommunication is less than inner chamber opposite side opening, intracavity including the coaxial setting of shutoff head, the shutoff head is used for shutoff chamber department of moulding plastics, the shutoff head passes through the connecting rod and sets up at the outside connecting block intercommunication of last mould and bed die, the connecting block can be linear motion in the axis direction of inner chamber, pneumatic unloading subassembly is still including the trachea that sets up in the intracavity, the trachea is used for inside intracavity gas delivery, how to avoid when the drawing of patterns to leave the technical problem that the vestige leads to the lens precision to change on the lens surface.

Description

High-precision injection mold for optical lens

Technical Field

The utility model relates to the technical field of lens processing, in particular to a high-precision injection mold for an optical lens.

Background

In recent years, optical products are developed rapidly at home and abroad by the characteristics of light weight, low price, low cost and the like, and are rapidly expanded to various fields of social life, a high-precision optical lens is one of main optical elements in photographic and video instruments, can be formed by optical-grade plastic injection molding, and needs to be formed by adopting a precision injection mold, the injection mold is a tool for producing plastic products and consists of a movable mold and a static mold, the movable mold is arranged on an upper template, the fixed mold is arranged on a lower template, a forming cavity is formed by closing the movable mold and the static mold, the movable mold and the static mold are separated when the mold is opened so as to take out the products, the injection molding is a processing method used for producing certain parts with complicated shapes in batches, specifically, materials melted by heating are injected into the mold cavity by high pressure, after cooling and solidification, formed products are obtained, and the existing injection mold needs to be pried to demould the products when demoulding, the drawing of patterns subassembly is uneven hard, can strain the product position that is relatively thin, takes place to warp easily or destroy, has so not only increased manufacturing cost, also has certain injury to mould itself, and the product is in under the high temperature environment when moulding plastics, and the natural cooling shaping can waste a large amount of time, seriously influences production efficiency, and the center of lens differs great with marginal thickness in addition, can produce the shrink easily when the cooling, and the product that makes can not reach high-accuracy requirement.

Chinese patent application No. cn201621116778.x discloses an optical lens height precision injection mold for illumination includes the cope match-plate pattern, the pneumatic cylinder, the push rod, the movable mould, the packing ring, the shaping chamber, quiet mould, the drawing of patterns push rod, the charge-in pipeline, the heat sink, bottom plate and lower bolster, the cope match-plate pattern passes through the packing ring with the lower bolster and constitutes this mould shell, the push rod makes the movable mould carry out the up-and-down motion under the effect of pneumatic cylinder, the charge-in pipeline is the tilting installation, the inside symmetry of quiet mould is equipped with a plurality of drawing of patterns push rods, the heat sink cools down the shaping chamber of quiet mould top when moulding plastics, to the even cooling in shaping chamber when the cooling.

However, the device adopts the demoulding push rod to blank the injection-molded optical lens, and when the injection-molded lens is not completely molded, deformation or traces are easily generated on the lens, so that the precision of the lens is changed to influence the quality of a finished product.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, a high-precision injection mold for an optical lens is provided. The technical problem of how to avoid leaving marks on the surface of the lens when demoulding to cause the precision of the lens to change is solved by the technical scheme.

In order to achieve the above purposes, the technical scheme adopted by the utility model is as follows:

a high-precision injection mold for an optical lens comprises an upper mold and a lower mold, wherein the upper mold and the lower mold are provided with corresponding injection molding cavities, and the upper mold is provided with an injection molding channel which is communicated with the upper mold and is connected with the injection molding cavities; go up all to be provided with pneumatic unloading subassembly on mould and the bed die, pneumatic unloading subassembly is including having a certain tapered inner chamber of having a perfect understanding last mould and bed die, the opening that the chamber was located is moulded plastics to the inner chamber intercommunication is less than inner chamber opposite side opening, intracavity including the coaxial setting of shutoff head, the shutoff head is used for shutoff chamber department of moulding plastics, the shutoff head passes through the connecting rod and sets up at the outside connecting block intercommunication of last mould and bed die, the connecting block can be linear motion in the axis direction of inner chamber, the trachea of intracavity including pneumatic unloading subassembly still sets up, the trachea is used for inside intracavity carrier gas.

Preferably, the opening part of the inner cavity, which is far away from one side of the injection molding cavity, is provided with a sealing block, the sealing block seals the inner cavity, and the sealing block is provided with a through hole for avoiding the connecting rod and the air pipe.

Preferably, the shape of one side of the blocking head close to the injection molding cavity is matched with that of the injection molding cavity.

Preferably, one side of the upper die facing the lower die is provided with a limiting block, the limiting block is arranged on the periphery of the injection molding channel, one side of the lower die facing the upper die is provided with a limiting groove corresponding to the limiting block, and the position and the shape of the limiting groove are matched with those of the limiting block.

Preferably, a cushion pad is arranged in the limiting groove.

Preferably, a cooling water channel for cooling the injection molding cavity is arranged in the lower die, the cooling water channel horizontally surrounds the periphery of the injection molding cavity, a liquid inlet pipeline and a liquid outlet pipeline which are communicated with the outside of the lower die are arranged on two sides of the cooling water channel, and the liquid inlet pipeline and the liquid outlet pipeline are obliquely arranged towards the lower side of the outer side.

Compared with the prior art, the application has the beneficial effects that:

1. this application makes lens atress even when avoiding with the direct contact of lens through setting up the pneumatic unloading subassembly in last mould and bed die to injection moulding's optical lens drawing of patterns, guarantees the smoothness of drawing of patterns.

2. This application sets up sealed piece through the opening part of keeping away from injection molding chamber one side at the inner chamber thereby realizes guaranteeing gaseous pressure when trachea is to inner chamber inside transport gas, avoids gaseous from another opening part of inner chamber reveal lead to can't provide the required pressure of drawing of patterns.

3. This application is identical and can guarantee the junction zero clearance through shutoff head and inner chamber size and identical with the chamber shape of moulding plastics, avoids injection moulding back lens surface to have deckle edge.

4. This application realizes the alignment in chamber of moulding plastics through the relative joint of stopper and spacing groove to it leads to injection moulding's lens not up to standard influence machining efficiency to avoid producing the deviation after mould and the bed die laminating.

5. This application realizes the buffering to the stopper through the bottom contact of blotter and stopper, avoids stopper bottom and the hard contact of limiting groove inside to lead to the stopper to produce deformation and influence follow-up stopper and break away from the spacing groove.

6. This application carries out even cooling to the model through the cooling water course that encircles all sides in the chamber of moulding plastics all sides, thereby guarantees can not influence the problem of lens precision because of the great difference that appears the shaping speed of difference in temperature.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken at B-B of FIG. 1;

FIG. 4 is a perspective view of the upper mold of the present invention;

FIG. 5 is a perspective view of the upper mold and pneumatic blanking assembly of the present invention;

FIG. 6 is an exploded perspective view of the lower mold of the present invention;

the reference numbers in the figures are:

1, mounting a mold; 1 a-an injection molding channel; 1 b-a limiting block;

2-lower mould; 2 a-an injection molding cavity; 2 b-a limit groove; 2b 1-cushion; 2 c-cooling water channels; 2c 1-liquid inlet pipe; 2c 2-liquid outlet pipe;

3-a pneumatic blanking assembly; 3 a-lumen; 3a 1-sealing block; 3a 2-vias; 3 b-a blocking head; 3b 1-link; 3b 2-connecting block; 3 c-trachea.

Detailed Description

The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

In order to solve the technical problem of how to avoid the lens precision change caused by the mark left on the lens surface during demolding, as shown in fig. 1 and 2, the following preferred technical solutions are provided:

a high-precision injection mold for an optical lens comprises an upper mold 1 and a lower mold 2, wherein the upper mold 1 and the lower mold 2 are provided with corresponding injection molding cavities 2a, and the upper mold 1 is provided with an injection molding channel 1a which runs through the upper mold 1 and is connected with the injection molding cavities 2 a; go up and all be provided with pneumatic unloading subassembly 3 on mould 1 and the bed die 2, pneumatic unloading subassembly 3 is including having a tapered inner chamber 3a of going through mould 1 and bed die 2, the opening that inner chamber 3a intercommunication injection molding chamber 2a department is less than the other side opening of inner chamber 3a, stopper head 3b is coaxial to be set up in inner chamber 3a, stopper head 3b is used for shutoff injection molding chamber 2a department, stopper head 3b passes through connecting rod 3b1 and sets up at last mould 1 and the outside connecting block 3b2 intercommunication of bed die 2, connecting block 3b2 can be linear motion in the axis direction of inner chamber 3a, pneumatic unloading subassembly 3 is still including setting up trachea 3c in inner chamber 3a, trachea 3c is used for to the transport gas in the inner chamber 3 a.

Specifically, the injection mold in this embodiment includes an upper mold 1 and a lower mold 2 that can be separated relatively, a closed injection molding cavity 2a is formed after the upper mold 1 and the lower mold 2 are spliced and molded, when in processing, a liquid injection molding material enters the injection molding cavity 2a through an injection molding channel 1a of the upper mold 1, when an optical lens is cooled and molded, the upper mold 1 and the lower mold 2 are separated for blanking, due to the existence of the injection molding channel 1a, the molded optical lens has a connection part which may be inserted into the injection molding channel 1a and cannot be smoothly demolded, in this embodiment, the pneumatic unloading assembly 3 disposed in the upper mold 1 and the lower mold 2 is used for demolding the injection molded optical lens, so as to avoid direct contact with the lens and make the lens uniformly stressed while ensuring smooth demolding, the unloading pneumatic assembly 3 includes an inner cavity 3a disposed at the injection molding cavity 2a, the inner cavity 3a has a certain taper, the plugging head 3b is inserted in the inner cavity 3a to plug the connection part of the inner cavity 3a and the injection molding cavity 2a, thereby ensuring the molding of the optical lens during injection molding, the plugging head 3b is connected with the connecting block 3b2 through the connecting rod 3b1, the connecting block 3b2 can be connected with the driving device to realize automatic movement in the axial direction of the injection molding cavity 2a, after injection molding, the connecting block 3b2 drives the plugging head 3b to move, because the inner cavity 3a has a certain taper, after the plugging head 3b moves, the inner cavity 3a and the injection molding cavity 2a form a gap, the air pipe 3c can convey air to the injection molding cavity 2a to separate the model from the mold, the air pipe 3c can be connected with air supply equipment such as an air compressor, one end of the air pipe 3c is arranged in the inner cavity 3a, and the stable separation of the lens model and the mold can be ensured by simultaneously starting the pneumatic blanking component 3 arranged at the upper mold 1 and the lower mold 2, the surface of the lens can be ensured not to generate scratches through pneumatically separating the mold from the model, and the precision of lens molding is improved.

Further, in order to solve the technical problem of how to ensure the gas in the gas pipe 3c to be delivered to the injection molding cavity 2a, as shown in fig. 2, the following preferred technical solutions are provided: the opening of the inner cavity 3a far away from the injection molding cavity 2a is provided with a sealing block 3a1, the sealing block 3a1 closes the inner cavity 3a, and the sealing block 3a1 is provided with a through hole 3a2 avoiding the connecting rod 3b1 and the air pipe 3 c.

Specifically, the pneumatic unloading subassembly 3 in this example can guarantee gaseous pressure when trachea 3c is inside to be carried gaseous to inner chamber 3a through set up sealed piece 3a1 at the opening part that inner chamber 3a kept away from injection molding chamber 2a one side, avoid gaseous from revealing from another opening part of inner chamber 3a and lead to unable required pressure of drawing of patterns, be provided with on the sealed piece 3a1 and dodge connecting rod 3b1 of shutoff head 3b and trachea 3 c's through-hole 3a2, the steady movement of shutoff head 3b can be guaranteed to through-hole 3a2, play the guide effect, sealed piece 3a 1's effect is guaranteed to through-hole 3a2 department.

Further, in order to solve the technical problem of how to avoid the blocking head 3b from affecting the precision of the optical lens molding, as shown in fig. 2, the following preferred technical solutions are provided: the shape of one side of the blocking head 3b close to the injection molding cavity 2a is matched with that of the injection molding cavity 2 a.

Specifically, the sealing head 3b in this embodiment guarantees the closure of inner chamber 3a when moulding plastics, and the shape of one side that the sealing head 3b is close to the chamber 2a of moulding plastics guarantees to be identical with the chamber 2a of moulding plastics to guarantee to accord with the manufacture standard after the lens shaping, the sealing head 3b can guarantee that the junction is gapless with the identical size of inner chamber 3a, avoids there being deckle edge in the lens surface after the injection moulding.

Further, in order to solve the technical problem of how to ensure that the upper mold 1 and the lower mold 2 are aligned to precisely form the injection molding cavity 2a conforming to the shape of the finished product, as shown in fig. 4 and 6, the following preferred technical solutions are provided: one side of the upper die 1 facing the lower die 2 is provided with a limiting block 1b, the limiting block 1b is arranged on the periphery of the injection molding channel 1a, one side of the lower die 2 facing the upper die 1 is provided with a limiting groove 2b corresponding to the limiting block 1b, and the position shape of the limiting groove 2b is matched with the limiting block 1 b.

Specifically, last mould 1 in this embodiment is provided with relative passageway 1a and the stopper 1b of moulding plastics with bed die 2, realizes the alignment of moulding plastics chamber 2a through stopper 1b and spacing groove 2 b's relative joint to avoid producing the skew after last mould 1 and the laminating of bed die 2 and lead to injection moulding's lens not up to standard to influence machining efficiency.

Further, in order to solve the technical problem of how to avoid hard contact when the injection molding channel 1a is butted with the limiting block 1b, as shown in fig. 6, the following preferable technical solutions are provided: a cushion pad 2b1 is arranged in the limit groove 2 b.

Specifically, be provided with blotter 2b1 in spacing groove 2b in this embodiment, during spacing piece 1b got into spacing groove 2b when last mould 1 laminated with bed die 2, the bottom of spacing piece 1b and the contact of blotter 2b1 realized the buffering to spacing piece 1b, avoided the rigid contact of spacing piece 1b bottom and spacing groove 2b inside to lead to spacing piece 1b to produce deformation and influence follow-up spacing piece 1b and break away from spacing groove 2 b.

Further, in order to solve the technical problem of how to rapidly and uniformly cool and accelerate the molding of the injection-molded lens, as shown in fig. 3, the following preferred technical solutions are provided: a cooling water channel 2c used for cooling the injection molding cavity 2a is arranged in the lower mold 2, the cooling water channel 2c horizontally surrounds the periphery of the injection molding cavity 2a, liquid inlet pipelines 2c1 and liquid outlet pipelines 2c2 communicated with the outer part of the lower mold 2 are arranged on two sides of the cooling water channel 2c, and the liquid inlet pipelines 2c1 and the liquid outlet pipelines 2c2 are obliquely arranged towards the outer lower side.

Specifically, be provided with cooling water course 2c in the lower mould 2 in this embodiment, cooling water course 2c encircles and forms in the week side of moulding plastics chamber 2a, can carry out even cooling to the model in the week side of moulding plastics chamber 2a when the coolant liquid gets into cooling water course 2c by inlet channel 2c1 department, thereby guarantee can not influence the problem of lens precision because the difference of the great shaping speed that appears of difference in temperature, inlet channel 2c1 and play liquid pipeline 2c2 respectively outside below slope setting can guarantee that the coolant liquid in the cooling water course 2c can not remain in inside.

The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the utility model, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A high-precision injection mold for an optical lens comprises an upper mold (1) and a lower mold (2), wherein the upper mold (1) and the lower mold (2) are provided with corresponding injection molding cavities (2a), and the upper mold (1) is provided with an injection molding channel (1a) which penetrates through the upper mold (1) and is connected with the injection molding cavities (2 a);

the pneumatic blanking device is characterized in that the upper die (1) and the lower die (2) are respectively provided with a pneumatic blanking assembly (3), the pneumatic blanking assembly (3) comprises an inner cavity (3a) which penetrates through the upper die (1) and the lower die (2) and has a certain taper, an opening of the inner cavity (3a) communicated with the injection molding cavity (2a) is smaller than the other side of the inner cavity (3a), a sealing head (3b) is coaxially arranged in the inner cavity (3a), the sealing head (3b) is used for sealing the injection molding cavity (2a), the sealing head (3b) is communicated with a connecting block (3b2) arranged outside the upper die (1) and the lower die (2) through a connecting rod (3b1), the connecting block (3b2) can do linear motion in the axis direction of the inner cavity (3a), the pneumatic blanking assembly (3) further comprises an air pipe (3c) arranged in the inner cavity (3a), and the air pipe (3c) is used for conveying air into the inner cavity (3 a).

2. A high-precision injection mold for optical lenses according to claim 1, wherein the opening of the inner cavity (3a) far from the injection cavity (2a) is provided with a sealing block (3a1), the sealing block (3a1) closes the inner cavity (3a), and the sealing block (3a1) is provided with a through hole (3a2) for avoiding the connecting rod (3b1) and the air tube (3 c).

3. A high precision injection mold for optical lenses according to claim 1, wherein the side of the blocking head (3b) close to the injection cavity (2a) is shaped to match the injection cavity (2 a).

4. The high-precision injection mold for the optical lens as claimed in claim 1, wherein a limiting block (1b) is arranged on one side of the upper mold (1) facing the lower mold (2), the limiting block (1b) is arranged on the periphery of the injection channel (1a), a limiting groove (2b) corresponding to the limiting block (1b) is arranged on one side of the lower mold (2) facing the upper mold (1), and the position shape of the limiting groove (2b) is matched with the limiting block (1 b).

5. A high precision injection mold for optical lenses according to claim 4, wherein the limiting groove (2b) is provided with a cushion pad (2b 1).

6. The high-precision injection mold for optical lenses according to claim 1, wherein a cooling water channel (2c) for cooling the injection molding cavity (2a) is arranged in the lower mold (2), the cooling water channel (2c) horizontally surrounds the injection molding cavity (2a), a liquid inlet pipeline (2c1) and a liquid outlet pipeline (2c2) which are communicated with the outside of the lower mold (2) are arranged on two sides of the cooling water channel (2c), and the liquid inlet pipeline (2c1) and the liquid outlet pipeline (2c2) are obliquely arranged towards the lower side of the outside.