CN102935694B - Optical lens mould - Google Patents

Abstract

The invention provides an optical lens mould, which comprises an upper mould and a lower mould, wherein the end surface of the lower mould forms a top surface, the periphery of the top surface is an edge part, a concave mould cavity is arranged in the center of the top surface, the edge of the mould cavity is sequentially provided with a flow channel and a pouring gate towards the edge part, a cut-off area is enclosed between the intersecting edge of the mould cavity and the flow channel and the side wall of the mould cavity close to the two sides of the flow channel, and the flow channel is communicated with the pouring gate through a connecting channel; the bottom surface of the cut-off area and the bottom surface of the die cavity form a step at the intersection, and the horizontal height of the bottom surface of the die cavity is lower than that of the bottom surface of the cut-off area at the step. The edge of the original mold cavity is arranged to be inclined at a position close to the runner, so that the single-side ejection of the mold is not extruded by the side wall, the labor is saved, and the product is not damaged; the bottom of the mold cavity is provided with a step, and the manufactured lens is prevented from being unsmooth due to the fact that the rough edges and the assembled surface are not on the same plane.

Description

Optical lens mold

technical field

The invention belongs to the field of optical molds, in particular to a mold for making optical lenses.

Background technique

The production of aspherical lenses by the practical injection method requires high-precision diamond turning methods to produce high-precision injection mold cores with a surface roughness of 25nm or even smaller, so nickel-plating is often used on the surface of the mold core and then precision is performed with a diamond knife. Processing molds, but although the precision can be more precise, it also solves the problem that diamond knives are easy to petrify, but it is inevitable that when making mold cores, the diamond knives will cause burrs when they are closed, even for existing molds. Kernels are released from the mold at right angles, resulting in difficulty in demoulding. The second is the poor circulation of the poured liquid, and these problems will inevitably lead to an increase in the rate of defective products.

Contents of the invention

The technical problem to be solved by the present invention is to provide an optical lens mold that facilitates the removal of burrs and allows the pouring material to enter smoothly while processing precision.

The present invention realizes above-mentioned object through following technical scheme:

The optical lens mold includes a mold core, the mold core includes an upper mold and a lower mold, the end surface of the lower mold forms a top surface, the outer edge of the top surface is an edge, and a concave mold is arranged at the center of the top surface. A cavity, the edge of the mold cavity is opened with a runner toward the edge, and the edge is provided with a gate toward the runner, and the intersection edge of the mold cavity and the runner is close to the runner A side wall of the mold cavity at both sides is surrounded by a section area, and the runner and the gate are connected by a continuous channel; the bottom surface of the section area and the bottom surface of the mold cavity form a step at the intersection, And at the step, the level of the bottom surface of the mold cavity is lower than the level of the bottom surface of the profiled area.

Preferably, the intersection of the bottom surface of the side section area and the bottom surface of the mold cavity is an inclined transitional step.

Further, the vertical distance between the bottom surface of the cut edge area and the top surface of the lower mold is greater than the vertical distance between the flow channel and the top surface of the lower mold.

Further, the size of the connecting channel gradually increases from the runner to the gate.

The side walls of the mold cavity near the two sides of the runner in the profile area are sloped walls, and the top of the sloped wall is inclined toward the end close to the runner.

The edge of the top surface of the lower mold is respectively provided with two opposite gates and runners.

The beneficial effect of the present invention is: by using the electroless nickel plated, and then processing with an ultra-precision processing machine and a C-axis with a diamond turning tool, the processing accuracy is improved, and the surface is a mirror surface, making the surface roughness smoother; In the mold core structure, a fan-shaped connecting channel is added between the runner and the gate. The purpose is to allow the plastic to flow more smoothly in the mold during the injection molding process. Because there are multiple mold cavities in the entire group of molds, it is necessary to allow During the molding process of each lens cavity, the plastic can be evenly filled in each cavity, and the product in each cavity can be kept consistent, which can improve the yield rate. The lens mold has a double-injection structure, adding a glue inlet on the opposite side of the original glue inlet, and adding an ejector pin under the new flow channel to balance the force of the product during the ejection process and improve the ejection process of the product. The deformation of the lens increases the qualified rate of the product and improves the problem of poor mold release of the lens. At the same time, the edge of the original mold cavity is set to be inclined near the flow channel, so that when the single side of the mold is ejected, it will not be squeezed by the side wall, which saves more effort and does not damage the product. Due to the unavoidable knife marks of the knife retraction during turning, a step is set between the bottom of the mold cavity and the edge cutting area to make the knife retraction smoother. The sides used for assembly are not on the same plane to avoid uneven stacking.

Description of drawings

Fig. 1 is the overall structural diagram of the mold and its partial enlarged structure;

Fig. 2 is the top view of lower mold;

Fig. 3 is a top view of the lower mold of the double-injection structure;

Figure 4 is the overall structure diagram of the mold with a double-injection structure.

In the figure, 1, lower mold; 11, mold cavity; 12, runner; 13, gate;

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

The optical lens mold includes a mold core. As shown in Figure 1, the mold core includes a lower mold 1 and an upper mold 2. The end surface of the lower mold 1 forms a top surface, and the outer edge of the top surface is an edge portion. A concave mold cavity 11 is arranged at the center of the surface, and the edge of the mold cavity 11 is provided with a flow channel 12 toward the edge, and a gate 13 is provided at the edge toward the flow channel 12. The intersection edge of the mold cavity 11 and the runner 12, and the sidewalls of the mold cavity 11 near the two sides of the runner 12 form a section edge area 14, and the gap between the runner 12 and the gate 13 is formed by A connecting channel 15 communicates; the bottom surface of the edge section 14 and the bottom surface of the mold cavity 11 form a step 3 at the intersection, and at the step 3, the level of the bottom surface of the mold cavity 11 is lower than the level of the bottom surface of the edge section 14.

Furthermore, referring to Fig. 1 and Fig. 2, the size of the connecting channel 15 between the runner 12 and the gate 13 gradually increases from the runner 12 to the gate 13, in particular, The connecting channel 15 is a smooth surface, and its purpose is to allow the plastic to flow more smoothly in the mold during the injection molding process. The original injection path is to flow directly from the runner 12 into the gate 13, and the gate 13 and There is no transition part in the runner 12, and the connection drop between the gate 13 and the runner 12 is large, which may easily cause uneven feeding. The large transitional connecting channel 15 is used to buffer the feeding speed, which can make the feeding process smoother. Because there are multiple mold cavities 11 in the whole set of molds, it is necessary for each lens to be formed during the molding process of the mold cavities 11. The plastic can be evenly filled in each mold cavity 11, so that the product in each mold cavity 11 can be consistent and the yield rate can be improved.

Its step 3 is formed as follows: the vertical distance between the bottom surface of the cut edge area 14 and the top surface of the lower mold 1 is greater than the vertical distance between the runner 12 and the top surface of the lower mold 1, and At the step 3, the height of the bottom surface of the mold cavity 11 from the top surface is greater than the height of the bottom surface of the edge area 14 from the top surface. The plane is lower than the plane corresponding to the mold cavity 11, and when the scissors are placed in the position corresponding to the edge-cutting area 14, they can abut against the edge of the step 3 on the bottom surface of the edge-cutting area 14, thereby accurately cutting the desired position. Preferably, an inclined surface 15 is formed at the intersection of the bottom surface of the profiled area 14 and the bottom surface of the mold cavity 11 . The purpose of making the step 3 is that the shearing surface of the lens is lower than the assembly stacking surface so that the burrs generated during the shearing process are also lower than the assembly stacking surface, so that the burrs will not affect the assembly process and effectively improve the axial deviation of the assembled lens. , At the same time, it also avoids poor stacking caused by burrs.

The sidewalls of the mold cavity 11 near the two sides of the flow channel 12 in the profiled area 14 are sloped walls 4 . FIG. 1 and FIG. 2 show its structure. The specific demoulding process is shown in the figure, because the general corner and the side wall are vertical, when the upper part of the lens is released from the mold, it needs to resist the molding material on the outside, and there will be a period of time during the ejection process. The arc-shaped movement is easy to get stuck due to the tightness between the corner and the side wall, but in this embodiment, when the connected part comes out of the mold, due to the inclination of the side wall, it will not be stuck at the corner due to the arc-shaped movement. Butt against the edge of the side wall, so that the ejection is smoother.

Furthermore, as shown in Figure 3, the lens mold can be used as a double-injection structure, that is, two opposite gates 13 and runners 12 are respectively arranged on the edge of the top surface of the lower mold 1, as shown in Figure 3 Show. After the product is formed, it can balance the strength of the lens during ejection, solve the problem of easy deformation during the ejection process, increase the product qualification rate, and solve the problem of poor mold release of the lens.

The above description does not limit the technical scope of the present invention in any way, and any modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (2)

1. optical lens die, comprise die, this die comprises patrix and counterdie, the end face of this counterdie forms end face, be edge part around this end face outer rim, described end face centre arranges the die cavity of an indent, described die cavity edge offers runner towards described edge part, described edge part arranges a cast gate towards described runner, surround one between described die cavity and the die cavity sidewall at the crossing edge of runner, close runner both sides place and cut open border area, it is characterized in that: be communicated with by a communication channel between described runner and described cast gate; Cut open the bottom surface in border area and the bottom surface of die cavity and form a step in intersection, and at step place, the level height of the bottom surface of die cavity is lower than the level height of bottom surface cuing open border area, cut open the step that the bottom surface in border area and the bottom surface of die cavity are an angled transition in intersection, described communication channel size increases to described cast gate gradually from runner.

2. optical lens die according to claim 1, is characterized in that: the vertical distance between the described bottom surface cuing open border area and the end face of described counterdie is less than the vertical distance between the end face of described runner and described counterdie.