CN100581779C

CN100581779C - Injection moulding forming machine for contact lens die

Info

Publication number: CN100581779C
Application number: CN200610161160A
Authority: CN
Inventors: 千成哲
Original assignee: RADTEK CO Ltd
Current assignee: RADTEK CO Ltd
Priority date: 2005-12-08
Filing date: 2006-12-07
Publication date: 2010-01-20
Anticipated expiration: 2026-12-07
Also published as: CN1982031A; KR200411134Y1

Abstract

The invention relates to an inject molding machine of contact lenses mould, comprising an upper mold core, a lower mold core connected to the lower part of the upper mold core, a lense mold core set at the inside of the lower mold core and forming a mode cavity of a certain interval with the lower part of the upper mold core. The upper mold core comprises a first upper mold, a second upper mold and a third upper mold. The first upper mold core forms a curved part which makes the lens interface of the mold protrude molding, and vertically or slantly forms a breaking platform on the lateral edge of the curved part, and then slantly forms the first tilted surface inside the breaking platform in the opposite direction of the curved part; the first upper mold clings and inserts to the inside of the second upper mold, a second tilted surface formed on the edge of the second upper mold clings to the first upper mold and prolongs and inclines from the breaking platform, the lateral of the second upper mold protrudes to form card platform; the second upper mold clings and inserts to the inside of the third upper mold, a junction board forms on the inside of the third upper mold to install the card platform and occlude.

Description

The injection moulding machine of contact lens die

Technical field

The present invention relates to a kind of injection moulding machine of contact lens die, relate in particular to and to carry out the machine-shaping of contact lens die easily, particularly carry out the Precision Machining of inclined projection easily, and can prevent the injection moulding machine of the contact lens die of contact lens edge part damage.

Background technology

In general, make when contact lens etc. has the moulded products of optical surface and can adopt several known methods, comprise the method for utilizing reproducible mould of plastics to come moulded products in these methods.

As a kind of method of utilizing mould of plastics to come moulded products, No. the 4121896th, United States Patent (USP) and No. 4208364 (Shepard) disclose a kind of static molds forming method that is used to make contact lens.The mould that is used for molded contact lens comprises: thermoplasticity formpiston part, and it has the 1st model face in order to form certain one side in the contact lens surface; Thermoplasticity former part, it has the 2nd model face in order to form the another side in the contact lens surface.Above-mentioned thermoplasticity former part and formpiston part manufacture a cover master metal mould by common machining and grinding process technique respectively.

United States Patent (USP) No. 4681295 (Haardt etc.) discloses a kind of three curves (tricurve) optical metal master mould.Above-mentioned three curve optical metal master moulds utilize the injection moulding manufacture method in the past of above-mentioned Shepard patent can repeat to make thermoplastics moldings with basic arc master metal mould.The thermoplastics moldings that can repeat to make is used for static molded contact lens, and above-mentioned eyeglass has three required curve shapes of convex lens surface and the required basic arc in concave mirror surface.According to above-mentioned patent, the machining of three curve master metal moulds is correct, complicated, accurate and permanent operation, and the follow-up attrition process of three curve metal die molds (blank mold) also needs careful and accurate operation.

According to above-mentioned method of making plastic molds in the past, mould of plastics is to utilize the master metal mould to obtain with known injection moulding or extrusion process, and the model face of mould of plastics is to form with metal tools.

But, when making contact lens etc. and have the goods of optical surface, metal tools need have the model face of optically smooth, and machining and the attrition process operation carried out for the surface that forms optically smooth on the metal tools, especially for the very irregular model face of the shapes such as model face of torus eyeglass processing operation, there is the shortcoming that needs correct, complexity and long working.

In addition, when processing the edge part of the master metal mould that is used for molding contact lenses sheet edge part, need utilize cutting element to process, not only be difficult to carry out Precision Machining, and add the breakage that causes the master metal mould man-hour easily.

On the other hand, when processing is used for the edge part of master metal mould of molding contact lenses sheet edge part in the past, form the inclined plane just merely, so edge part is sharper during the contact lens moulding, easy damage eyeball during use, damage and can not bring into play original function easily during washing.

Summary of the invention

The present invention proposes in order to address the above problem.The injection moulding machine that the purpose of this invention is to provide a kind of contact lens die, the processed mould edge part has formed inclined plane and vertical disconnected platform, not only can form the concave surface of contact lens, can also make lens edge portion be shaped to inclined plane and vertical plane, the present invention is handling ease not only, and process time can be shortened, improve operating efficiency, particularly require the Precision Machining ratio of the inclined projection of precise measure to be easier to, the damage of contact lens edge part can be prevented, dependability can be improved.

For achieving the above object, the injection moulding machine of contact lens die of the present invention has convexly curved portion is formed at the bottom upper core, the bottom core that combines with the upper core lower end, it is inboard and form the eyeglass core of certain intervals die cavity with the lower end of upper core to be arranged at the bottom core, injects mould material mould in above-mentioned die cavity; It is characterized in that, above-mentioned upper core has the 1st upper core, the 2nd upper core and the 3rd upper core, wherein, the 1st upper core is formed with bend, make the eyeglass contact-making surface of mould can protrude moulding, and vertical or be formed obliquely disconnected platform at the bend outer ledge, be formed obliquely the 1st inclined plane on the inboard edge of disconnected platform with the bend rightabout; The 2nd upper core inboard is close to and is inserted the 1st upper core, and the 2nd upper core edge part forms the 2nd inclined plane, makes the 2nd inclined plane be close to the 1st inclined plane and extends the then outstanding Ka Tai that is formed with in the 2nd upper core outside from disconnected platform; Inboard the 2nd upper core of inserting of the 3rd upper core is formed with the connection platform in the 3rd upper core inboard, can settle Ka Tai and interlock.

Description of drawings

Fig. 1 is the longitudinal section of mold injection molding machine of the present invention.

Fig. 2 is a upper core decomposing state schematic diagram of the present invention.

Fig. 3 a is the mould stereogram that mold injection molding machine of the present invention is made, and Fig. 3 b is the sectional view of Fig. 3 a.

Fig. 4 is the mould user mode figure of the present invention that is used for the molding contact lenses sheet.

Reference numeral

12: the 1 upper core, 13: bend, 14: disconnected platform, 15: the 1 inclined planes, 16: the 2 upper core, 17: the 2 inclined planes, 18: Ka Tai, 20: the 3 upper core, 21: connect platform, 30: bottom core, 31: the 1 disconnected platforms, 32: mould material inlet, 33: the 2 disconnected platforms, 35: eyeglass core, 40: die cavity, 50: mould, 51: blade, 52: the eyeglass contact-making surface, 53: support portion, 54: inclined projection, 60: formpiston.

The specific embodiment

Describe most preferred embodiment of the present invention with reference to the accompanying drawings in detail.

Fig. 1 is the longitudinal section of mold injection molding machine of the present invention; Fig. 2 is a upper core decomposing state schematic diagram of the present invention; Fig. 3 a is the mould stereogram that mold injection molding machine of the present invention is made, and Fig. 3 b is the sectional view of Fig. 3 a; Fig. 4 is the mould user mode figure of the present invention that is used for the molding contact lenses sheet.

As shown in drawings, mold injection molding facility of the present invention upper core, the bottom core 30 that combines with the upper core lower end that the bottom protrudes are arranged, be arranged at bottom core 30 inboard and with the eyeglass core 35 of the lower end formation certain intervals die cavity 40 of upper core.

In addition, as chief component of the present invention, above-mentioned upper core has the 1st upper core, the 2nd upper core and the 3rd upper core, wherein, the 1st upper core 12 is formed with bend 13, make the moulding of can caving in of the eyeglass contact-making surface 52 of mould 50, and vertical or be formed obliquely disconnected platform 14 at bend 13 outer ledges, be tilted with the 1st inclined plane 15 on disconnected platform 14 inboard edges with bend 13 rightabouts; The 2nd upper core 16 inboards are close to and are inserted the 1st upper core 12, and edge part forms the 2nd inclined plane 17, make the 2nd inclined plane 17 be close to the 1st inclined plane 15 and extend the then outstanding card platform 18 that is formed with in the 2nd upper core 16 outsides from disconnected platform 14; The 3rd upper core 20 inboards are inserted the 2nd upper core 16 and by the screw combination, are formed with connection platform 21 in the 3rd upper core 20 inboards, can settle card platform 18 and interlocks.

Promptly, upper core is by the 1st upper core 12 of inboard and be positioned at the 2nd upper core 16 in centre position and the 3rd upper core 20 in the outside is formed, and the combination of being close to by the 1st upper core 12 and the 2nd upper core 16, in the mould 50 inboard inclined projection 54 that form certain altitudes.

Here, die cavity 40 is formed between upper core and bottom core 30 and the eyeglass core 35, bottom core 30 is formed with the mould material inlet 32 that is communicated with die cavity 40, when injection mo(u)lding, liquid mould material is injected into die cavity 40, just can carries out the moulding of contact lens die 50 by above-mentioned mould material inlet 32.

Aforesaid liquid shape mould material can adopt plastic resins such as polypropylene or polystyrene, the mould 50 of injection mo(u)lding, is inner recess and isolates the former that forms inclined projection 54 with inside edge portion to shown in Figure 4 as Fig. 3 a in conjunction with above-mentioned upper core and bottom core 30 and eyeglass core 35.

Therefore, be to make contact lens, need the corresponding formpiston 60 of other injection mo(u)lding and above-mentioned mould 50, at mold parts of moulding, be to inject monomer between above-mentioned mould 50 and the formpiston 60 to make contact lens, form front and the marginal portion that contact lens protrudes by mould 50.

Here, bottom core 30 is incorporated into the end of the 3rd upper core 20, be formed with the blade 51 that the 1st disconnected platform 31 is used for processing mold 50 to the inside in bottom core 30 ends, and below the 1st disconnected platform 31, be formed with the support portion 53 that the 2nd disconnected platform 33 is used for processing mold 50, above-mentioned eyeglass core 35 tops are recess, can move up and down in bottom core 30 inboards.

As mentioned above, when finishing injection moulding machine, can form the die cavity 40 of certain space, the liquid mould material of the injection inclined projection 54 of mould 50 naturally just die cavity 40 in inside in conjunction with upper core and bottom core 30 and eyeglass core 35.

Effect of the present invention and effect with said structure are as follows.For processing mold 50 need be in conjunction with upper core and bottom core 30 and eyeglass core 35.

At this moment, in the upper core, under the state that the 3rd upper core 20 in the outside is fixing, introduce the 2nd upper core 16 from a side opening portion of the 3rd upper core 20, by the screw combination, and make the card platform 18 of the 2nd upper core 16 closely be connected in the connection platform 21 of the 3rd upper core 20.

Then, when the 1st upper core 12 is introduced in the inboard of the 2nd upper core 16, the 2nd inclined plane 17 of the 2nd upper core 16 will closely be connected with the 1st inclined plane 15 of the 1st upper core 12, be connected the outstanding inclined projection 54 that forms mould 50 with the 2nd the tight of inclined plane 17 by the 1st inclined plane 15.

That is, the 2nd inclined plane 17 closely is connected in the 1st inclined plane 15 and extends from the 1st inclined plane 15, forms inclined projection 54 between the disconnected platform 14 of the 1st upper core 12 and the 2nd inclined plane 17.

As mentioned above, 54 processing of the inclined projection of mould 50 are very simple, and can accurately cut inclined projection 54, therefore the edge part of molded lenses more easily when the molding contact lenses sheet.

On the other hand, after upper core, bottom core 30 closely is connected in the end of the 3rd upper core 20, to the bottom core 30 inboard eyeglass cores 35 that insert, finish the combination of injection moulding machine, will form naturally like this can mould 50 die cavity 40, by mould material inlet 32 liquid mould material is injected into die cavity 40, through just can injection forming mold 50 behind the certain hour.

As mentioned above, injection moulding machine for the molding contact lenses sheet, when reducing mould 50 percent defectives when the technology of the inclined projection 54 of precise forming mold 50 will be to injection mo(u)lding and exert an influence, contact lens is made engineering and manufacturing expense generation material impact, consider from this point, can form not only handling ease of the of the present invention disconnected platform 14 of inclined projection 54 of mould 50 and the 1st inclined plane 15 and the 2nd inclined plane 17, do not need Precision Machining, and just can form inclined projection 54 by the combination of the 1st upper core 12 and the 2nd upper core 16, therefore the minimise wear of inclined projection 54 can be made the mould 50 of same size in a large number.

As mentioned above, by the present invention, the mould of molding contact lenses sheet is not only processed simply, and do not need Precision Machining, and make whole processing operation become easy, rapid, improved operating efficiency, particularly need the Precision Machining of inclined projection of precise measure easy, and can prevent from the damage of contact lens edge part to have improved dependability, can also cut down manufacturing cost and maintenance cost.

Claims

1, a kind of injection moulding machine of contact lens die, its have the bottom form bend upper core, the bottom core that combines with described upper core lower end, to be arranged at described bottom core inboard and form the eyeglass core of certain intervals die cavity, injection mould material mould in described die cavity with the lower end of described upper core;

It is characterized in that described upper core has the 1st upper core (12), the 2nd upper core (16) and the 3rd upper core (20); Wherein, described the 1st upper core (12) is formed with bend (13), make the eyeglass contact-making surface (52) of mould (50) can protrude moulding, and vertical or be formed obliquely disconnected platform (14) at described bend (13) outer ledge, inboard at described disconnected platform (14) along being tilted with the 1st inclined plane (15) with described bend (13) rightabout; Insertion described the 1st upper core (12) is close in described the 2nd upper core (16) inboard, described the 2nd upper core (16) edge part forms the 2nd inclined plane (17), make described the 2nd inclined plane (17) be close to described the 1st inclined plane (15) and extend the then outstanding Ka Tai (18) that is formed with in described the 2nd upper core (16) outside from disconnected platform (14); Inboard described the 2nd upper core (16) of inserting of described the 3rd upper core (20) is formed with connection platform (21) in described the 3rd upper core (20) inboard, can settle Ka Tai (18) and interlock.