CN109591260B - Injection mold for multicolor spectacle frames - Google Patents

Abstract

The invention discloses an injection mold for multicolor spectacle frames, which relates to the technical field of injection molds. The upper mold and the lower mold are also provided with a cavity for forming the non-slip section and the different-colored part of the bending section, and the hot runner is communicated with the cavity. The upper mold is provided with an injection port for injection by the injection molding machine, the injection port is communicated with the hot runner, and the length direction of the hot runner in the upper mold is along the vertical direction. A spring is arranged on the lower die. First, a clamping portion is slidably arranged on both sides of the positioning cavity. Compared with the coloring method of spray paint, the shape and position of the injection-molded heterochromatic layer are accurate, and it is not easy to stick to irrelevant parts, and no manual spraying is required, which reduces the manual workload; the positioning accuracy of the temple in the lower mold is high. , Strong stability, can ensure the quality of plastic molding; the quality of the spectacle frame produced by the injection mold is better.

Description

Injection mold for multicolor spectacle frames

technical field

The invention relates to the technical field of injection molds, in particular to an injection mold for multicolor spectacle frames.

Background technique

Glasses are common wearable articles in life. Glasses include frames and lenses, and frames include frames and temples. At present, the materials of the frames are mostly polymer materials such as plastics and resins, and the frames are generally produced by injection molds.

Referring to FIG. 1, it is an existing temple, including a main body 5. Both ends of the main body 5 are respectively provided with anti-slip sections 51 and bending sections 52, wherein the anti-slip sections 51 are used for people to hold the temples to wear glasses. , the bending section 52 is used to contact with the back of the ear to prevent the glasses from falling.

The current method of producing the multi-color spectacle frame is that after the main body 5 is injection-molded, the anti-skid section 51 and the bending section 52 are sprayed with paint for coloring. However, the method of spraying paint is easy to contaminate irrelevant parts, and manual spraying is required, and the workload is large.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an injection mold for a multi-color spectacle frame, which is not easy to touch the irrelevant parts when manufacturing the different-color layer, and the manual workload is small.

The above-mentioned technical purpose of the present invention is achieved through the following technical solutions: an injection mold for a multi-color spectacle frame, comprising an upper mold and a lower mold, and a hot runner is provided between the upper mold and the lower mold for placing the temples. A positioning cavity, the upper mold and the lower mold are further provided with a cavity for forming the non-slip section and the different-colored part of the bending section, and the hot runner is communicated with the cavity.

Through the above technical solution, the upper mold and the lower mold are pre-separated, and the personnel place the main body of the temple to be injected and colored in the corresponding position of the positioning cavity, and then control the upper mold and the lower mold to approach each other to complete the mold closing. After the mold is closed, the injection molding machine works, and the liquid plastic output by the injection molding machine enters the cavity through the hot runner. After the liquid plastic is cured and formed, the plastics of different colors form the non-slip section and the different-colored layer on the bending section. The personnel control the separation of the upper mold and the lower mold. Since the non-slip sections and bending sections on the temples are colored by injection molding, the thickness of the heterochromatic layer can be set thicker, which has the advantage of full color; and the plastic is cooled and solidified in a molten state, and the heterochromatic layer The combination with the main body is very tight, and the heterochromatic layer is not easy to fall off. Compared with the coloring method of spray paint, the shape and position of the injection-molded heterochromatic layer are accurate, and it is not easy to stick to irrelevant parts, and no manual spraying is required, which reduces the manual workload.

Preferably, the upper mold is provided with an injection port for injection by the injection molding machine, the injection port is communicated with the hot runner, and the length direction of the hot runner in the upper mold is along the vertical direction.

Through the above technical solution, after the mold is opened, the plastic in the hot runner of the upper mold forms a vertical upward columnar burr, and the personnel can take out the burr of the lower mold and the product together by pulling the burr, and the product is unloaded. more convenient.

Preferably, a spring 1 is provided on the lower die, and a clamping portion is slidably provided on both sides of the positioning cavity. The clamping portion can clamp the main body by sliding, and the elastic direction of the spring 1 drives the clamping portion away from the clamping portion. Positioning cavity; the clamping part is provided with an inclined guide surface 1, and the upper die is provided with a guide surface 2 toward the lower die. When the upper die moves toward the lower die, the guide surface 1 passes through the guide surface The second drives the clamping portion to slide and clamp the main body.

Through the above technical solution, when the upper mold moves in the direction of the lower mold, the first guide surface drives the clamping portion to slide toward the positioning cavity through the second guide surface, and clamps the main body; when the upper mold leaves the lower mold, the second guide surface and the guide surface As soon as the surface is separated, the clamping part is away from the positioning cavity under the elastic force of the spring 1. At this time, the personnel can easily pick and place the main body, and the movement of the clamping part can be completed automatically without manual operation. When the upper die is closed to the lower die, on the one hand, the main body is limited by the cavity wall of the positioning cavity, and the main body is not easy to bend; Move to produce spontaneously. The cooperation between the positioning cavity and the clamping part enables the main body to have high positioning accuracy and stability, which can ensure the molding quality of the plastic during injection molding.

Preferably, the clamping part includes a clamping claw for contacting with the main body, and the side wall of the clamping claw forms a part of the cavity wall of the cavity.

Through the above technical solution, when the jaws clamp the main body and the injection molding operation is performed in the mold, the side walls of the jaws also play a role in defining the shape of the plastic. The pressure inside is relatively large, and the liquid plastic is not easy to enter the gap between the positioning cavity and the main body, which can ensure the positional accuracy of the plastic after molding.

Preferably, a plurality of pairs of the clamping jaws are arranged at intervals along the length direction of the positioning cavity.

Through the above technical solution, a plurality of clamping claws and positioning cavities are alternately in contact with the main body, so that the main body can be uniformly stressed, and the main body is more stable after the installation is completed.

Preferably, the lower mold is fixed with a guide column toward the upper mold, the guide column is protruded and fixed with a protrusion toward the direction of the hot runner, and a movable rod is slidably arranged in the upper mold, and one end of the movable rod forms the upper mold The inner wall of the hot runner, the other end of the movable rod abuts the outer wall of the guide column; when the mold is opened, the protrusion pushes the movable rod to slide into the hot runner.

Through the above technical solution, when the mold is opened, the upper mold moves upward relative to the guide column, the bump drives the movable rod to slide into the hot runner, and the movable rod clamps the plastic burrs in the hot runner of the upper mold, and the connected burrs are used to clamp the plastic burrs in the hot runner. The product is pulled from the lower die. As the upper die continues to move, the end of the movable rod slides away from the bump, the plastic burr in the hot runner loses the pressure from the bump, the product and the burr can fall to the lower die with gravity, and then personnel take out the product That's it. The cooperation of the movable rod and the bump can automatically complete the demoulding of the product, which greatly facilitates the cutting of the product.

Preferably, the guide post penetrates into the upper die, and the upper die is provided with a guide hole for sliding fit with the guide post and the projection.

Through the above technical solution, while the guide post realizes the function of automatic demolding, the guide post is slidably matched with the upper die, which can improve the stability when the upper die and the lower die slide relative to each other.

Preferably, the upper mold is provided with a second spring which drives the movable rod to move in the direction of the guide column.

Through the above technical solution, when the upper die and the lower die are separated, and when the end of the movable rod slides away from the bump, the movable rod moves toward the guide column under the elastic force of the second spring, so that the movable rod returns to the side of the guide column At this time, the movable rod is retracted into the hole wall of the hot runner of the upper mold, and the product and the burrs can fall to the lower mold with gravity. By arranging the second spring, the burrs in the hot runner of the upper mold are not easily stuck on the movable rod, which improves the reliability of the product demoulding process.

Preferably, the top surface of the lower mold is inclined toward the outside of the lower mold.

Through the above technical solutions, the top surface of the lower mold is inclined outwards to facilitate the personnel to take out the product or place the temple to be injection-molded.

To sum up, the beneficial effects of the present invention compared with the prior art are:

1. Compared with the coloring method of spray paint, the shape and position of the injection-molded heterochromatic layer are accurate, and it is not easy to touch the irrelevant parts, and no manual spraying is required, which reduces the manual workload;

2. The mirror legs have high positioning accuracy and strong stability in the lower mold, which can ensure the molding quality of the plastic;

3. By setting the movable rod and the bump, the injection mold can automatically complete the demoulding of the product.

Description of drawings

Fig. 1 is the perspective view of a kind of existing temples;

Fig. 2 is the perspective view of the injection mold of the multi-color spectacle frame of the embodiment in the mold clamping state;

3 is a perspective view of the injection mold of the multicolor spectacle frame of the embodiment in an open state;

Fig. 4 is the enlarged view at B of Fig. 3;

5 is a perspective view of the upper mold of the injection mold, mainly highlighting the structure of the second guide surface;

FIG. 6 is a cross-sectional view taken along the line A-A of FIG. 2 , mainly highlighting the structure of the movable rod and the convex block.

In the figure, 1. Upper mold; 2. Lower mold; 10. Guide post; 11. Injection port; 12. Hot runner; 21. Positioning cavity; 22. Mold cavity; 23. Inner groove; 3. Clamping part; 31 , drive plate; 32, clamping jaw; 231, spring one; 321, guide surface one; 13, guide surface two; 14, guide hole; 101, bump; 4, movable rod; 15, spring two; 5, main body; 51. Anti-skid section; 52. Bending section.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 2 and FIG. 3 , an injection mold for a multi-color spectacle frame disclosed in the present invention includes an upper mold 1 , a lower mold 2 , and a guide post 10 disposed between the upper mold 1 and the lower mold 2 . The top of the upper mold 1 is provided with an injection port 11 for injection molding by an injection molding machine. Both the upper mold 1 and the lower mold 2 are provided with a hot runner 12 and a positioning cavity 21 for placing the temples. The upper mold 1 and the lower mold 2 are also provided with There is a cavity 22 for forming the non-slip section 51 and the different-colored portion of the bending section 52 . The length direction of the hot runner 12 of the upper mold 1 is in the vertical direction (refer to FIG. 6 ), and the hot runner 12 of the lower mold 2 is dispersed to each cavity 22 . When the upper mold 1 and the lower mold 2 are fastened together, the injection port 11 , the hot runner 12 and the cavity 22 of the upper mold 1 and the lower mold 2 are connected to each other.

The top surface of the lower mold 2 is inclined toward the outside of the lower mold 2 , and the shape of the bottom surface of the upper mold 1 corresponds to the shape of the top surface of the lower mold 2 . After the injection molding of the product is completed and the mold is opened, the plastic in the hot runner 12 is also connected and solidified with the product, and the product is adhered to the lower mold 2. The top surface of the lower mold 2 is inclined outwards to facilitate personnel to take out the product or place the mirror to be injected. leg. After the mold is opened, the plastic in the hot runner 12 of the upper mold 1 forms a vertical upward columnar burr material, and the personnel can take out the burr material and the product of the lower mold 2 by pulling the burr material, and the blanking of the product is relatively convenient.

3 and 4, the size of the positioning cavity 21 is just enough for the main body 5 to be put in, the top surface of the lower mold 2 is located on both sides of the positioning cavity 21 with inner grooves 23 respectively, and the depth of the inner groove 23 is the same as the depth of the positioning cavity 21. Similar, the inner groove 23 has three channels communicating with the positioning cavity 21 . A clamping portion 3 is slidably arranged in the inner groove 23 . The clamping portion 3 includes a driving plate 31 and three clamping jaws 32 facing the positioning cavity 21 . The driving plate 31 is fixedly connected with the corresponding clamping jaws 32 , and the three clamping jaws 32 They are respectively located in the three channels of the inner groove 23 and establish a sliding connection with the channels. The end of the clamping jaw 32 facing the positioning cavity 21 is concave in a U shape, and the concave shape thereof corresponds to the shape of the outer wall of the main body 5 . When the main body 5 is placed in the positioning cavity 21 , the clamping jaws 32 can clamp and fasten the main body 5 by sliding.

The two pairs of clamping claws 32 located at both ends of the positioning cavity 21 in the longitudinal direction are respectively close to the two cavities 22 for forming the anti-skid section 51 and the bending section 52, and the side walls of the two pairs of clamping claws 32 form corresponding cavities 22. part of the cavity wall. When the clamping jaws 32 clamp the main body 5 and the injection molding operation is performed in the mold, the side walls of the clamping jaws 32 also play a role in defining the shape of the plastic. The pressure in 22 is relatively large, and the liquid plastic is not easy to enter into the gap between the positioning cavity 21 and the main body 5, which can ensure the positional accuracy of the plastic after molding.

4 and 5, the inner groove 23 is provided with a spring one 231, and the two ends of the spring one 231 are respectively fixed with the drive plate 31 and the groove wall of the inner groove 23; The elastic force of 231 drives the clamping portion 3 away from the positioning cavity 21 . The top of the clamping jaw 32 is provided with an inclined guide surface 1 321 . The inclination direction of the guide surface 1 321 is: along the direction of the lower die 2 toward the upper die 1 , the guide surface 1 321 approaches the direction of the positioning cavity 21 . The upper die 1 is provided with a guide surface 2 13 facing the lower die 2 , and the guide surface 2 13 corresponds to the position of the guide surface 1 321 and is parallel to the guide surface 1 321 . When the upper die 1 moves in the direction of the lower die 2, the guide surface 1 321 drives the clamping portion 3 to slide toward the positioning cavity 21 through the guide surface 2 13, and clamps the main body 5; when the upper die 1 leaves the lower die 2, the guide The surface 2 13 is separated from the guide surface 1 321 , and the clamping portion 3 is away from the positioning cavity 21 under the elastic force of the spring 1 231 . When the upper mold 1 is closed to the lower mold 2, the main body 5 is limited by the cavity wall of the positioning cavity 21 on the one hand, and the main body 5 is not easy to bend; 5. It is not easy to be twisted and deformed, and it is not easy to spontaneously move along the axial direction. The cooperation between the positioning cavity 21 and the clamping jaws 32 enables the main body 5 to have high positioning accuracy and stability, which can ensure the molding quality of the plastic during injection molding.

Referring to FIGS. 3 and 6 , the number of guide columns 10 is two, and the hot runner 12 of the upper mold 1 is located on the connecting line of the two guide columns 10 . The length direction of the guide column 10 is consistent with the direction of opening and closing the mold. The guide column 10 is fixed to the lower die 2 , and the upper die 1 is provided with a guide hole 14 for the guide column 10 to be inserted and slid. The guide post 10 is protruded and fixed with a convex block 101 toward the direction of the hot runner 12. The longitudinal section of the convex block 101 is a trapezoid. Space for block 101 to slide. A movable rod 4 is slid in the upper mold 1 along the horizontal direction. The upper die 1 is also embedded with a second spring 15 . The two ends of the spring 2 15 are in contact with the upper die 1 and the movable rod 4 respectively. When the upper die 1 is closed to the lower die 2, the movable rod 4 is located below the convex block 101, and the movable rod 4 and the convex block 101 have a short idle stroke in the vertical direction.

When the mold is opened, the upper mold 1 moves upward relative to the guide column 10, and within a short empty stroke, the movable rod 4 is stationary relative to the upper mold 1, the product adheres to the lower mold 2, and the product and the burrs are separated from the upper mold 1. . As the upper mold 1 continues to move, the bump 101 drives the movable rod 4 to slide in the hot runner 12 of the upper mold 1, and the movable rod 4 clamps the plastic burrs in the hot runner 12 of the upper mold 1 and passes the connected burrs. The product is pulled out from the lower die 2. As the upper die 1 continues to move, the end of the movable rod 4 slides away from the bump 101 , and the movable rod 4 moves toward the guide column 10 under the elastic force of the second spring 15 , so that the movable rod 4 returns to the side of the guide column 10 . At this time, the movable rod 4 retracts into the hole wall of the hot runner 12 of the upper mold 1, and the product and the burrs can fall onto the lower mold 2 with gravity, and then the personnel can take out the product. The cooperation between the movable rod 4 and the convex block 101 can automatically complete the demoulding of the product, which greatly facilitates the unloading of the product.

The working conditions of the injection mold of the multi-color spectacle frame are as follows: the upper mold 1 and the lower mold 2 are in a separated state in advance, and the personnel place the temple body 5 to be injection-colored in the corresponding position of the positioning cavity 21, and then control the upper mold 1 , The lower mold 2 is close to each other to complete the mold closing. After the mold is closed, the injection molding machine works, and the liquid plastic output by the injection molding machine enters the cavity 22 through the injection port 11 and the hot runner 12 . After the liquid plastic is solidified and formed, the personnel controls the upper mold 1 and the lower mold 2 to separate, and at this time, the workpiece is taken out to complete the production of the product.

Since the anti-skid section 51 and the bending section 52 on the temple are colored by injection molding, the thickness of the heterochromatic layer can be set thicker, and the heterochromatic layer has the advantage of full color; and the plastic is cooled and solidified from the molten state. The combination of the different-color layer and the main body 5 is very tight, and the different-color layer is not easy to fall off. Compared with the coloring method of spray paint, the shape and position of the injection-molded heterochromatic layer are accurate, and it is not easy to stick to irrelevant parts, and no manual spraying is required, which reduces the amount of manual labor.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (8)

1. The utility model provides an injection mold of polychrome spectacle frame, includes mould (1), lower mould (2), go up and be equipped with hot runner (12), supply location chamber (21) that the mirror leg was placed between mould (1) and lower mould (2), characterized by: the upper die (1) and the lower die (2) are also provided with a die cavity (22) for molding different color parts of the anti-skid section (51) and the bending section (52), and the hot runner (12) is communicated with the die cavity (22);

the lower die (2) is provided with a first spring (231), clamping parts (3) are arranged on two sides of the positioning cavity (21) in a sliding mode, the clamping parts (3) can clamp the main body (5) in a sliding mode, and the clamping parts (3) are driven to be far away from the positioning cavity (21) by the elastic force direction of the first spring (231); be equipped with the spigot surface (321) of slope on clamping part (3), go up mould (1) and be equipped with spigot surface two (13) towards lower mould (2), work as go up mould (1) and when moving to lower mould (2) direction, spigot surface one (321) orders about clamping part (3) through spigot surface two (13) and slides and press from both sides tight main part (5).

2. The injection mold of a multi-color spectacle frame according to claim 1, wherein: the injection molding machine is characterized in that the upper die (1) is provided with an injection molding port (11) for injection molding of the injection molding machine, the injection molding port (11) is communicated with a hot runner (12), and the length direction of the hot runner (12) in the upper die (1) is along the vertical direction.

3. The injection mold of a multi-color spectacle frame according to claim 1, wherein: the clamping part (3) comprises a clamping jaw (32) used for being in contact with the main body (5), and the side wall of the clamping jaw (32) forms a part of the cavity wall of the cavity (22).

4. The injection mold of a multi-color spectacle frame as claimed in claim 3, wherein: the clamping jaws (32) are arranged in a plurality of pairs at intervals along the length direction of the positioning cavity (21).

5. The injection mold of a multi-color spectacle frame as claimed in claim 2, wherein: a guide post (10) is fixed on the lower die (2) towards the upper die (1), a convex block (101) is fixed on the guide post (10) in a protruding manner towards the direction of the hot runner (12), a movable rod (4) is arranged in the upper die (1) in a sliding manner, one end of the movable rod (4) forms the inner wall of the hot runner (12) of the upper die (1), and the other end of the movable rod (4) abuts against the outer wall of the guide post (10); when the mould is opened, the convex block (101) pushes the movable rod (4) to slide in the hot runner (12).

6. The injection mold of a multi-color spectacle frame as claimed in claim 5, wherein: the guide post (10) penetrates into the upper die (1), and the upper die (1) is provided with a guide hole (14) in sliding fit with the guide post (10) and the bump (101).

7. The injection mold of a multi-color spectacle frame as claimed in claim 5, wherein: and a second spring (15) for driving the movable rod (4) to move towards the direction of the guide column (10) is arranged in the upper die (1).

8. The injection mold of a multi-color spectacle frame according to claim 1, wherein: the top surface of the lower die (2) inclines towards the outside of the lower die (2).

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