阅读说明：本技术 一种丙酸纤维眼镜腿的注塑成型方法 (Injection molding method of propionic acid fiber glasses legs ) 是由 周福贵 于 2020-12-22 设计创作，主要内容包括：本发明公开了一种丙酸纤维眼镜腿的注塑成型方法,该方法用于将金属插针注塑在丙酸纤维眼镜腿本体内,包括以下步骤：将丙酸纤维原料放入注塑机的料筒内,将金属插针放入注塑模具内；利用注塑模具上的定位装置定位所述金属插针；启动注塑机,通过注塑机将熔融的丙酸纤维原料注入注塑模具的眼镜腿成型腔内；注塑模具冷却后开模取出注塑成型的眼镜腿。本发明,用高精注塑模具替代了打脾机,形体更稳定、硬度好,质量更优,并且大大降低了生产成本,提高了生产效率,还可以通过对丙酸纤维原料配色获得不同颜色的眼镜腿,颜色随心所欲,多种颜色可调。(The invention discloses an injection molding method of a propionic acid fiber glasses leg, which is used for injecting a metal contact pin into a propionic acid fiber glasses leg body, and comprises the following steps: putting a propionic acid fiber raw material into a charging barrel of an injection molding machine, and putting a metal contact pin into an injection mold; positioning the metal contact pin by using a positioning device on an injection mold; starting an injection molding machine, and injecting a molten propionic acid fiber raw material into a glasses leg forming cavity of an injection mold through the injection molding machine; and opening the mold after the injection mold is cooled, and taking out the injection molded glasses legs. According to the invention, the high-precision injection mold is used for replacing a spleen beating machine, the shape is more stable, the hardness is good, the quality is better, the production cost is greatly reduced, the production efficiency is improved, the glasses legs with different colors can be obtained by matching colors of the propionic acid fiber raw material, the color is freely desired, and multiple colors can be adjusted.)

1. An injection molding method of propionic acid fiber glasses legs is used for injecting metal pins into a propionic acid fiber glasses leg body, and is characterized by comprising the following steps:

putting a propionic acid fiber raw material into a charging barrel of an injection molding machine, and putting a metal contact pin into an injection mold;

positioning the metal contact pin by using a positioning device on an injection mold;

starting an injection molding machine, and injecting a molten propionic acid fiber raw material into a glasses leg forming cavity of an injection mold through the injection molding machine;

and opening the mold after the injection mold is cooled, and taking out the injection molded glasses legs.

2. The method of claim 1, wherein different colored temples are obtained by color matching the propionic acid fiber material.

3. The method of claim 1, wherein the metal pin comprises:

the contact pin body is used for being injection molded inside the propionic acid fiber glasses leg body;

the front end of the connecting piece is provided with a protruding part which protrudes inwards out of the propionic acid fiber glasses leg body, the front end of the protruding part is provided with a hinge for connecting with a pile head of glasses, and the protruding part is provided with a plurality of longitudinally-through positioning holes;

the positioning device is a positioning line which penetrates through the positioning hole to position the metal contact pin.

4. The method as claimed in claim 1, wherein the heating temperature of the blanking region of the injection molding machine is 235 ℃, the heating temperature of the injection molding region of the injection mold is 200 ℃ and 225 ℃, the injection pressure of the injection mold is 70-80Mpa, and the flow rate is 10-20 m/s.

5. The method according to claim 3, wherein the injection mold is provided with a plurality of temple forming cavities arranged side by side, a plurality of metal pins are respectively placed in the corresponding temple forming cavities, and the coaxial positioning holes on the plurality of metal pins are fixed by the same positioning line.

6. The method according to claim 5, wherein the positioning wire is threaded by a crochet needle, and one end of the positioning wire is fixed at one end of the injection mold and the other end is detachably hooked at the other end of the injection mold.

7. The method of claim 3 wherein the pin body is cylindrical and the front portion is flattened into a flat sheet-like front piece.

8. The method of claim 7 wherein the front inner side of the front panel is smooth and planar and the upper, lower and outer sides are rough.

9. The method of claim 7, wherein the inner side of the transition connection of the front piece to the cylinder is provided with a plurality of longitudinal grooves.

10. The method of claim 9, wherein the longitudinal grooves are V-shaped grooves.

Technical Field

The invention relates to the technical field of glasses, in particular to an injection molding method of a propionic acid fiber glasses leg.

Background

The glasses have various styles and materials. The plate glasses frame is light in weight, high in hardness, good in glossiness, attractive in style, not prone to deformation and color change, durable and popular with people.

The material of the plate spectacle frame mainly comprises two types of acetate fiber and CP propionic acid fiber, wherein hydroxyl in the molecule of the CP propionic acid cellulose is a high polymer in propionic acid, so the plate spectacle frame has good weather resistance and low temperature resistance, and gradually becomes the main material of a high-grade spectacle frame.

The manufacturing process of the CP cellulose propionate glasses leg comprises two processes of injection molding and pressing and grinding. For example, chinese patent CN 209842252U discloses a propionic acid fiber (CP) injection-molded spectacle frame, which comprises a body and spectacle legs, wherein the body comprises a propionic acid fiber spectacle frame, the propionic acid fiber spectacle frame comprises a left spectacle frame and a right spectacle frame, a connecting member is arranged on each of the outer wall sides of the left spectacle frame and the right spectacle frame, when the spectacle is used, the two spectacle legs are poked left and right, the spectacle legs slide left and right under the action of the connecting member, and when the spectacle legs are perpendicular to the spectacle frames, the angle is very suitable and convenient for wearing the spectacle, a rubber sleeve is further arranged on one side of the spectacle legs, namely the wearing position of the spectacle legs and organs, and a nose support is further arranged on one side of the rectangular outer wall of the spectacle frame, so that the spectacle frame is more comfortable to wear. In the scheme, the glasses legs are all formed by directly injecting CP propionic acid fibers, and the strength and the elasticity need to be further improved because metal contact pins are not inserted into the glasses legs.

The current CP propionic acid fiber glasses legs are usually inserted with metal pins by adopting a spleen beating machine, and the main production process comprises the following steps: cutting the plate by a pressing plate, baking for 72-120 hours, and driving the metal pins into the plate which is baked and softened by a high-frequency machine by a spleen driving machine. Because the spleen beating machine has high temperature, the working environment of operators is severe, and only one spleen beating machine can beat at a time, so that the working efficiency is low; in addition, the glasses legs produced by the production process have large deviation, instability and high rejection rate. After the spleen is beaten, the procedures of digging the spleen, scraping the spleen, cleaning glue and the like are required, and the production period is long.

The biggest difficulty of the process of using the metal contact pin and the CP propionic acid fiber for integral injection molding is as follows: the accurate positioning of the metal contact pin in the die is difficult to achieve, the rejection rate is high, the production cost is increased, and particularly, the batch production cannot be achieved.

In view of the above, there is an urgent need to improve the existing CP propionic acid fiber glasses leg injection molding process to reduce the rejection rate and the cost, and to be suitable for mass production.

Disclosure of Invention

Aiming at the defects, the technical problem to be solved by the invention is to provide an injection molding method of propionic acid fiber glasses legs, so as to solve the problems of high rejection rate, high production cost and incapability of batch production in the existing technology of the production of the glasses legs of propionic acid fiber glasses.

Therefore, the propionic acid fiber injection molding glasses leg forming method provided by the invention is used for injecting a metal inserting needle into a propionic acid fiber glasses leg body, and comprises the following steps:

putting a propionic acid fiber raw material into a charging barrel of an injection molding machine, and putting a metal contact pin into an injection mold;

positioning the metal contact pin by using a positioning device on an injection mold;

starting an injection molding machine, and injecting a molten propionic acid fiber raw material into a glasses leg forming cavity of an injection mold through the injection molding machine;

and opening the mold after the injection mold is cooled, and taking out the injection molded glasses legs.

In the scheme, preferably, the glasses legs with different colors are obtained by matching colors on the propionic acid fiber raw material.

In the above aspect, preferably, the metal pin includes:

the contact pin body is used for being injection molded inside the propionic acid fiber glasses leg body;

the front end of the connecting piece is provided with a protruding part which protrudes inwards out of the propionic acid fiber glasses leg body, the front end of the protruding part is provided with a hinge for connecting with a pile head of glasses, and the protruding part is provided with a plurality of longitudinally-through positioning holes;

the positioning device is a positioning line which penetrates through the positioning hole to position the metal contact pin.

In the above scheme, preferably, the heating temperature of the blanking region of the injection molding machine is 235 ℃, the heating temperature of the injection molding region of the injection mold is 200-225 ℃, the injection pressure of the injection mold is 70-80Mpa, and the flow rate is 10-20 m/s.

In the above scheme, preferably, the injection mold is provided with a plurality of glasses leg molding cavities arranged side by side, the plurality of metal pins are respectively placed in the corresponding glasses leg molding cavities, and the plurality of coaxial positioning holes in the metal pins are fixed by the same positioning line.

In the above scheme, preferably, the positioning wire is threaded by a crochet hook, one end of the positioning wire is fixed at one end of the injection mold, and the other end of the positioning wire is detachably hooked at the other end of the injection mold.

In the above aspect, preferably, the pin body is a cylinder, and the front portion is flattened into a flat sheet-shaped front piece.

In the above aspect, preferably, the front inner side of the front panel is a smooth plane, and the upper, lower and outer sides are rough surfaces.

In the above solution, preferably, the inner side surface of the transition connection portion between the front piece and the cylinder is provided with a plurality of longitudinal convex grooves.

In the above aspect, preferably, the longitudinal groove is a V-shaped groove.

According to the technical scheme, the injection molding method of the propionic acid fiber glasses leg provided by the invention adopts the propionic acid fiber raw material and the metal contact pin to be integrally injection molded, and compared with the prior art, the injection molding method has the following beneficial effects:

firstly, a spleen beating machine is replaced by a high-precision injection mold, the shape is more stable, the hardness is good, the quality is better, the production cost is greatly reduced, and the production efficiency is improved.

Secondly, in a preferred scheme of the invention, the glasses legs with different colors can be obtained by matching colors of the propionic acid fiber raw material, and the colors can be adjusted as desired.

And thirdly, the positioning holes are formed in the connecting piece of the metal contact pin, so that the position of the metal contact pin in the injection mold can be accurately positioned, the yield is improved, and the cost is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly described and explained. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a flow chart of the injection molding method of the propionic acid fiber glasses leg provided by the invention;

FIG. 2 is a schematic view of the temple of the present invention;

FIG. 3 is a schematic view of a metal pin according to the present invention;

fig. 4 is a schematic view showing mass production of temples of the present invention.

In fig. 1 to 4, the correspondence between the components is as follows:

a metal pin 210, a temple body 220;

rough surface 223, longitudinal groove 224, protrusion 225, hinge 226, and positioning hole 227.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

The realization principle of the invention is as follows: the propionic acid fiber raw materials are matched colors through a charging barrel of an injection molding machine, metal contact pins are placed in the injection molding die and positioned, the injection molding machine is started, the molten propionic acid fiber raw materials are injected into a glasses leg forming cavity of the injection molding die through the injection molding machine, and the glasses legs are obtained through injection molding. Therefore, the production efficiency is improved, the rejection rate is reduced, and the production cost is reduced.

In order to make the technical solution and implementation of the present invention more clearly explained and illustrated, several preferred embodiments for implementing the technical solution of the present invention are described below.

It should be noted that the terms of orientation such as "inside, outside", "front, back" and "left and right" are used herein as reference objects, and it is obvious that the use of the corresponding terms of orientation does not limit the scope of protection of the present invention.

Referring to fig. 1, fig. 1 is a flow chart of an injection molding method of a propionic acid fiber glasses leg provided by the invention.

As shown in figure 1, the injection molding method of the propionic acid fiber glasses leg provided by the invention comprises the following steps:

step 110: the propionic acid fiber raw material is placed into a charging barrel of an injection molding machine, and the metal contact pin is placed into an injection mold.

In this step, the glasses legs with different colors can be obtained by carrying out color matching on the propionic acid fiber raw material. Therefore, the method of the invention can adjust the colors of the glasses legs freely and conveniently.

Step 120: and positioning the metal contact pin by utilizing a positioning device on the injection mold.

The accurate positioning of the metal pins is the key to ensure the finished product rate. The traditional glasses legs usually only have one hinge hole, and the accurate positioning cannot be realized. Therefore, a clamping mode is required, so that the clamp is complex and the tooling cost is high.

According to the method provided by the invention, the positioning hole is formed in the connecting piece of the metal contact pin, so that the position of the metal contact pin in the injection mold can be accurately positioned through the positioning silk thread, a complex clamping device is not needed, the tooling cost is reduced, and the yield is improved.

Step 130: and starting the injection molding machine, and injecting the molten propionic acid fiber raw material into a glasses leg forming cavity of the injection mold through the injection molding machine.

In the step, the heating temperature of the blanking area of the injection molding machine is 235 ℃, the heating temperature of the injection molding area of the injection mold is 200-225 ℃, the injection pressure of the injection mold is 70-80Mpa, and the flow rate is 10-20 m/s.

Step 140: and opening the mold after the injection mold is cooled, and taking out the injection molded glasses legs.

And then, cutting off a water gap, polishing and shaping by a water roller.

In the above method, as shown in fig. 2 and 3, the temple is manufactured by using a propionic acid fiber injection molding process, and includes a metal pin 210 and a propionic acid fiber temple body 220 which is injection-molded and wrapped on the outer surface of the metal pin 210.

Metal insert pin includes contact pin body and connecting piece, and the contact pin body is used for injection moulding in the inside of propionic acid fibre glasses leg body, improves the intensity of glasses leg body 220 on the one hand, and on the other hand provides stronger elasticity, and the user is difficult not hard up after wearing.

The contact pin body is a cylinder, the front part of the contact pin body is flattened into a flat sheet front piece, the inner side surface of the front end of the front piece is a smooth plane, and the upper side surface, the lower side surface and the outer side surface are rough surfaces 223. The inner side surface of the transition connecting part of the front piece and the rear cylinder is provided with a plurality of longitudinal convex grooves 224, and the longitudinal convex grooves 224 are V-shaped grooves, so that greater elastic restoring force can be provided, and the glasses legs have greater elasticity.

The connecting piece sets up on the anter medial surface of contact pin body, can adopt the welding mode fixed. The front end of the connecting piece is provided with a convex part 225 which is inwards protruded out of the propionic acid fiber glasses leg body, the convex part 225 is in a rectangular column shape, and the inner side surface of the rear end is in an inwards concave arc shape. The front end of the protruding part 225 is provided with a hinge 226 for connecting with the stud of the glasses frame, and the protruding part 223 is provided with a plurality of positioning holes 227 which are longitudinally penetrated.

The method provided by the invention can also be used for conveniently carrying out batch production, and specifically comprises the following steps:

as shown in fig. 4, the injection mold is provided with a plurality of glasses leg molding cavities arranged side by side, a plurality of metal pins 210 are respectively placed into the corresponding glasses leg molding cavities, and coaxial positioning holes are formed in the plurality of metal pins and are fixed through the same positioning line 230, so that the plurality of metal pins 210 can be simultaneously positioned in the plurality of injection molds through the positioning line 230 for batch production.

The positioning line can be threaded by the crochet hook, one end of the positioning line is fixed at one end of the injection mold, and the other end of the positioning line is detachably hooked at the other end of the injection mold. And after the glasses legs are subjected to injection molding, taking down the end of the positioning line from the other end of the injection mold, and taking out the positioning line to open the mold and take down the glasses legs.

With the above description of the specific embodiments, the glasses and the glasses leg structure formed by injection molding of propionic acid fiber thereof provided by the invention have the following advantages compared with the prior art:

firstly, the propionic acid fiber raw material and the metal contact pin are integrally injection-molded, the production speed is 5 times faster than that of the traditional mode of inserting the metal contact pin into a spleen beating machine, the cost is reduced by 1/3, the production cost is greatly reduced, and the production efficiency is improved. And the shape is more stable, the hardness is good, and the quality is better. The color of the propionic acid fiber raw material is convenient to adjust and can be combined at will.

And secondly, the positioning holes are formed in the connecting piece of the metal contact pin, so that the position of the metal contact pin in the injection mold can be accurately positioned, the yield is improved, and the cost is further reduced.

Thirdly, the front part of the metal pin is flattened to form a flat front piece, the inner side surface of the front end of the front piece is a smooth plane, and the upper side surface, the lower side surface and the outer side surface are rough surfaces. The medial surface of the transition connecting portion of anter and cylinder at rear portion is equipped with many vertical tongue, and this vertical tongue is the V-arrangement groove, can provide bigger firm power and elastic restoring force from this to make the earpiece have bigger elasticity.

Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.