JP3137150U - Plastic molds with cooling channels used in the production of optical lenses - Google Patents

Abstract

A cooling channel structure for injection molding of a plastic optical lens is provided.
A male mold 30 and a female mold 35 are provided.
The male mold is a columnar body, and a molding part 305 is projected on one end surface,
The female mold is also a columnar body, and a molding part 355 is recessed in one end surface, and a molding mold space S is formed integrally with the male mold molding part when the mold is fitted.
The male and female molds are provided with ring-shaped grooves 301 and 351 for cooling in the columnar bodies, respectively, and connected to 302, 303, 352, and 353 opened on the opposite side of the columnar body for circulation cooling. As a result, the plastic material in the cooling process is uniformly cooled and solidified.
[Selection] Figure 2

Description

  The present invention relates to a casting water channel structure used for manufacturing an optical lens, and more particularly, to an injection molding casting apparatus for a large plastic lens, by a fluid circulation cooling action in an annular groove between the male mold and the female mold. In the cooling process of optical lens injection molding, the plastic material is unevenly cooled, so the lens surface curvature is uneven, avoiding the production of defective products, high precision and reducing defective products The present invention relates to a casting channel structure that achieves the production of optical lenses.

Normally, as shown in FIG. 1, an optical lens injection molding machine adds plastic particles from a funnel 10 in a quantitative and intermittent manner, sends them into a heating tube, heats them, melts them, and then pistons 12 or press heads. After entering the mold hole of the mold through the nozzle, after filling the mold hole, the plastic material is cooled by the mold hole cooling system, solidified, and lowered to an appropriate temperature It is only necessary to open the mold and project the product, and then the next injection molding process can be continued.
JP 2004-249640 A

In the conventional injection molding machine, the cooling water channel 11 is laid around the body of the stationary mold 13 and the sliding mold 14 to cool the high-temperature melted plastic M1 in the mold hole and to have a sufficient strength. (Plastic strength is related to temperature and time factor).
Factors to consider are: The number of cycles in the molding process (Time Cycle), cooling channel control system, reaction changes that occur after cooling solidification in the furnace during the filling process, heat flow and mold heat balance Among them, the control method of the cooling water channel is the key, but the conventional cooling water channel 11 is laid in consideration of only rapid molding of the plastic material and cooling of the mold, It does not correspond to uniform heat conduction, precise calculation in cooling solidification process, and improvement of the design of the cooling water channel structure, causing concentration and unevenness of the lens surface hardness after molding the optical lens, and the optical lens mirror surface The difference in curvature becomes large, and the high precision quality of the optical lens is where improvement is desired.

The present invention provides a casting channel structure for use in manufacturing an optical lens, which includes a male mold, a female mold,
The male mold is a columnar body, an annular groove is provided in the column body, one end surface is provided on the male mold at both ends of the annular groove, and a molding portion is projected on the other end of the male mold. And is fitted in correspondence with the molding part of the female mold,
The female mold is also a columnar body, an annular groove is provided in the column body, both ends of the annular groove are provided with one end surface of the female mold, and the other end of the female mold is provided with a recessed molding portion, It is fitted with the molding part of the male mold,
The fluid circulation cooling action in the annular groove between the male mold and the female mold avoids uneven plastic material cooling during the cooling process of the optical lens injection molding and prevents the lens hardness concentration phenomenon. The lens mirror surface curvature is caused to be uneven, the product is prevented from being defective, and the object of high precision and yield improvement is achieved.

The present invention clearly has an inventive step and practicality, and is analyzed as follows in comparison with the prior art.
Conventional technology,
1. The conventional injection mold cooling water channel structure of injection molding only considers rapid molding of the plastic material and cooling of the mold, and easily causes the phenomenon of concentration of hardness of the optical lens. The optical lens mirror surface curvature is uneven and a defective product is manufactured.
2. The defect rate of the optical lens is increased, the material is wasted, and the manufacturing cost is increased.
3. The production of large optical lenses requires the control of the uniform heat conduction of the optical lens, which increases the difficulty of the technology.

The advantages of the present invention are
1. The symmetrical water channel circulation structure design of the mold eliminates the hardness concentration phenomenon of the optical lens and improves the yield at the time of optical lens injection molding.
2. The structure is simple and can be easily adapted to the mold design of each mold, improve the yield, stabilize the quality, improve the market competitiveness of the product

  As shown in FIG. 2 and FIG. 3, it is an explanatory view of the casting channel structure of the present invention, and consists of a male mold 30 and a female mold 35.

The male mold 30 is a columnar body and is installed in the sliding mold 31, and is provided with a water inlet 302 and a drain outlet 303 at one end of the male mold 30. An annular groove 301 is provided in 30 columns, and both ends of the annular groove 301 are fitted with a water supply port 302 and a drain port 303 of the male mold 30, respectively, and a molding part is formed at the other end of the male mold 30. 305 is protruded and fitted into the sliding mold 31 so as to face the molding portion 355 of the female mold 35.
The female mold 35 is also columnar, and is disposed corresponding to the sliding mold 31. A water supply port 352 and a drainage port 353 are provided at one end of the female mold 35, and the female mold 35 has a columnar body. An annular groove 351 is provided, and both ends of the annular groove 351 are mutually fitted with a water supply port 352 and a drain port 353 of the female die 35, and the male die 30 is connected to the other end of the female die 35. The molding part 355 is recessed corresponding to the molding part.
When the male mold 30 and the female mold 35 are fitted, a mold hole S structure is formed in a corresponding portion of the molding part 305 of the male mold 30 and the female mold 355, and the optical lens plastic material As shown in FIG. 4, in the process in which 300 is molded at a constant pressure in the mold hole S, the heat generated during the molding and solidification process is rapidly generated through the fluid circulation in the annular grooves 301 and 351. The optical lens plastic material 300 is quickly and evenly cooled by conducting into the fluid in the grooves 301 and 351, and evenly diffusing and radiating heat to the circulating cooling water channel, thereby completing the molding and solidification of the optical lens plastic material 300. .

In the present invention, preferred embodiments have been disclosed as described above, but these are not intended to limit the present invention in any way, and anyone who is familiar with the technology has an equivalent scope that does not depart from the spirit and scope of the present invention. Of course, various fluctuations and hydration colors can be added.

It is sectional drawing of the conventional casting water channel structure. It is explanatory drawing of the casting water channel structure of this invention. It is decomposition | disassembly explanatory drawing of the casting water channel structure of this invention. It is explanatory drawing of the application principle of the casting channel structure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Funnel 11 Cooling water channel 12 Piston 13 Fixed metal mold 14 Sliding metal mold M1 High temperature melting state plastic 2 Casting water channel structure 30 Male metal mold 31 Sliding metal mold 301 Annular groove 302 Water supply port 303 Drainage port 305 Molding part 35 Female Mold 351 Annular groove 352 Water supply port 353 Drain port 355 Molding part S Mold hole 300 Optical lens plastic material

Claims (3)

It consists of male mold and female mold,
The male mold has a molded part projecting on one end surface,
The female mold has a molding part recessed at one end surface to form a molding mold space integrally with the male mold molding part when fitting the mold,
The male and female molds are provided with cooling annular grooves in the mold, respectively, connected to supply and drainage channels that open on the opposite side of the molding part, and circulated and cooled. A plastic mold with a cooling water channel used to manufacture lenses. The plastic molding die provided with a cooling water channel used for manufacturing an optical lens according to claim 1, wherein the male die is a columnar body. The plastic molding die having a cooling water channel used for manufacturing an optical lens according to claim 1, wherein the female die is a columnar body.

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