CN113954296A

CN113954296A - Double-color injection mold

Info

Publication number: CN113954296A
Application number: CN202111398849.5A
Authority: CN
Inventors: 虞伟炳; 李金国; 杨新
Original assignee: Zhejiang Saihao Industrial Co ltd
Current assignee: Zhejiang Saihao Industrial Co ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-01-21

Abstract

The invention provides a double-color injection mold, and belongs to the technical field of molds. The method solves the problem of how to improve the appearance quality of a double-color injection molding finished product. The double-color injection mold comprises a first fixed mold and a movable mold, wherein the parting surface of the first fixed mold is a first fixed mold parting surface, a sealing glue step protruding relative to the first fixed mold parting surface is arranged on the first fixed mold, the sealing glue step is positioned at the junction of a cavity of the first fixed mold and the first fixed mold parting surface, the upper surface of the sealing glue step is a sealing glue surface, and the width of the sealing glue surface is smaller than that of the first fixed mold parting surface; when the movable mold is in contact with the glue sealing step for mold closing, a gap is formed between the first fixed mold parting surface and the movable mold parting surface, and when mold closing force is increased and mold closing is continued, the movable mold can enable the glue sealing step to be elastically deformed and enable the gap to be closed. Through the design, the area of the mold for forming the impression can be greatly reduced, so that the appearance defect of a formed product caused by the impression is greatly weakened, and finally, the appearance quality of the product is greatly improved.

Description

Double-color injection mold

Technical Field

The invention belongs to the technical field of molds, and relates to a double-color injection mold.

Background

The double-color mold is a mold in which two plastic materials are injected on the same injection molding machine and are molded twice, but the product is only demoulded once. This molding process, also known as two-shot molding, is typically accomplished with a single mold and requires a specialized two-shot injection molding machine. Double-color injection molding has been widely applied to almost all plastic fields such as daily necessities, decorations, automobile parts, electronic products, electric tools, medical products, household appliances, toys and the like, and the manufacturing and molding of double-color molds and the research and development of double-color multi-color injection molding machines and double-color injection molding raw materials have also been developed rapidly.

The double-color mold structure adopted in the mold industry at present mainly has a rotary disk type, a rotating shaft type or an improved mode thereof. The rotating disc type rotating mechanism is characterized in that a rotating disc capable of rotating 180 degrees is additionally arranged on a movable template of the injection molding machine, a mold is arranged on the rotating disc, and transposition injection molding of the mold is realized through rotation of the rotating disc. The rotating shaft type rotating mechanism is characterized in that a rotating shaft capable of rotating 180 degrees is additionally arranged on a movable template of the injection molding machine, the rotating shaft is connected with a mold core of the mold, and the mold core is pulled back and closed after being rotated by a special transmission device, so that the mold core is rotated to realize transposition injection molding of the mold. For example, chinese patent [ application No.: 20162143927.2 discloses a manufacturing mould of two-tone button of carousel formula, including first cover half, second cover half and have the two movable moulds of same die cavity, first cover half has first color die cavity, first color die cavity has a sprue, and has a lug that corresponds with the indicator of two-tone button and instruction lamp hole in the first die cavity, the second cover half has the second color die cavity, the second die cavity have a sprue and one with the convex part that the instruction lamp hole corresponds, two movable moulds are connected on a carousel, the die cavity of two movable moulds corresponds the first color die cavity of first cover half and the second color die cavity of second cover half respectively. Through this double-colored injection mold, need not to glue the button main part of double-colored button and the bonding of indicator injection moulding respectively again, technology is simpler, production efficiency is high.

However, the conventional two-color injection mold like the above also has the following drawbacks: the whole plane of the joint of the first fixed die and the first movable die in the traditional double-color die is a parting surface and also a first glue sealing surface, and due to the existence of errors of die part processing, die matching, surface polishing and the like, when the first fixed die and the first movable die are assembled, the first glue sealing surface is extruded by the parting surface of the first movable die to generate imprinting on the first glue sealing surface; and when accomplishing first look and moulding plastics, first movable mould removes this moment and can form the second colour die cavity through actuating mechanism cooperation and carry out the second look and mould plastics, because some product molding needs, the die cavity and the die joint of first cover half and second cover half design are different, so under this condition, the first face of gluing at impression place this moment will become the partly of product profiled surface, the product after will leading to the shaping like this appears the condition of surface roughness because of the existence of above-mentioned impression, influence the pleasing to the eye of product, finally influence the appearance quality of shaping product.

In this regard, in order to improve the appearance quality of the molded product, those skilled in the art may easily conceive of a technical means of improving the appearance quality of the molded product by improving the smoothness of the molding surface and the parting surface of the corresponding movable mold, and improving the machining and die-matching accuracy of the relevant mold part, thereby reducing the occurrence of the impression. However, the above-mentioned conventional techniques have relatively high requirements for manufacturing the mold.

Disclosure of Invention

The invention aims to provide a double-color injection mold aiming at the problems in the prior art, and the technical problem to be solved by the invention is how to improve the appearance quality of a double-color injection molding finished product.

The purpose of the invention can be realized by the following technical scheme: a double-color injection mold comprises a first fixed mold and a movable mold, wherein the parting surface of the first fixed mold is a first parting surface of the fixed mold, and the double-color injection mold is characterized in that the first fixed mold is provided with a protruding adhesive sealing step which is elastic relative to the first parting surface of the fixed mold, the adhesive sealing step is positioned at the junction of a cavity of the first fixed mold and the first parting surface of the fixed mold, the upper surface of the adhesive sealing step is an adhesive sealing surface, and the width of the adhesive sealing surface is smaller than the width of the first parting surface of the fixed mold; when the movable die is in contact with the glue sealing step for die assembly, a gap is formed between the first fixed die parting surface and the movable die parting surface, and when the die assembly force is increased and the die assembly is continued, the movable die can enable the glue sealing step to be elastically deformed and close the gap.

The whole block of parting surface on the first fixed die is used for sealing the glue surface in the existing double-color injection mold, so that the impression formed on the existing glue surface is very wide, and the appearance quality of the injection molding finished product is seriously influenced. The invention achieves the purpose of weakening the imprinting and improving the appearance quality of the product by redesigning the sealing glue surface. Specifically, according to the invention, an outwardly-protruded sealing glue step is designed on a first fixed die of a two-color die, particularly at the junction of a cavity of the first fixed die and a parting surface I of the fixed die, and the sealing glue step enables the parting surfaces of the first fixed die and a movable die to be separated to form a gap when the first fixed die and the movable die are closed, so that after the design, when the first fixed die and the movable die are closed, the parting surfaces of the first fixed die and the movable die cannot be in direct collision contact, the parting surface of the movable die can be firstly in contact with and extruded by the sealing glue step, namely, the buffering of the sealing glue step is obtained, and the imprinting can be directly formed on the upper surface of the sealing glue step, namely, the newly-designed sealing glue surface, but not the parting surfaces of the first fixed die and the movable die; meanwhile, the width of the glue sealing surface is smaller than that of the parting surface I of the fixed die, so that the forming area of the imprinting is reduced in a phase-changing manner, when the movable die moves below the second fixed die of the two-color die, the glue sealing surface is used as a part of the forming surface of the second color cavity, and the appearance quality of a formed product can be improved due to the fact that the imprinting is greatly reduced; and because the sealing glue step has certain elasticity, the gap can be reduced and closed along with the improvement of the mold closing force, the condition of glue leakage caused by the reduction of the sealing glue area can be avoided, the molded product can not generate batch edge, and the appearance quality of the molded product can be further ensured.

In the double-color injection mold, the ratio of the width of the glue sealing surface to the width of the first fixed mold parting surface is 0.1-0.5. Through the design of the width ratio, the width of the glue sealing surface is reduced to the maximum extent while the glue sealing requirement of the product is met, so that the area for forming the stamping is reduced to the maximum extent, and the purpose of improving the appearance quality of the formed product is further achieved.

In the double-color injection mold, an inner included angle between the side surface of the glue sealing step, which is far away from the cavity of the first fixed mold, and the glue sealing surface is an acute angle. Through the design, the glue sealing step is extruded to generate elastic deformation, so that the glue leakage problem can not occur at the glue sealing surface, and the appearance quality of a formed product is ensured.

In the double-color injection mold, an included angle between the side surface of the glue sealing step close to the cavity of the first fixed mold and the glue sealing surface is an obtuse angle. Through the design, the glue sealing step is extruded to generate elastic deformation, so that the glue leakage problem can not occur at the glue sealing surface, and the appearance quality of a formed product is ensured.

In the double-color injection mold, the height of the bulge of the sealing glue step is 0.015-0.055 mm. The height of the bulge is the size of the gap, and through the height design, the requirement of sealing glue is guaranteed by closing the gap when die assembly is carried out, and finally the appearance quality of a molded product is guaranteed.

In the double-color injection mold, the width of the glue sealing surface is 0.015-0.55 mm. Through the design, the width of the glue sealing surface is reduced to the maximum extent while the glue sealing requirement of the product is met, so that the area for forming the impression is reduced to the maximum extent, and the purpose of improving the appearance quality of the formed product is further achieved.

In the double-color injection mold, the glue sealing steps are strip-shaped and arranged along the shape around the edge of the cavity of the first fixed mold. Through the design, the problem of glue leakage is avoided.

In the double-color injection mold, the mold body of the first fixed mold is provided with the clearance step, and the first fixed mold parting surface is the upper surface of the clearance step. Through the design, the closing of the first fixed die parting surface is facilitated during die assembly.

Compared with the prior art, the double-color injection mold has the following advantages: this double-colored injection mold seals the glue step through the design and carries out redesign in order to seal the width of gluing the face to first definite mould for the mould forms the impression area and can obtain reducing greatly, thereby makes the shaping product weaken greatly because of the appearance defect that the impression leads to, has finally improved the appearance quality of shaping product greatly.

Drawings

FIG. 1 is a partial overall frame schematic view of the present two-color injection mold.

Fig. 2 is a partial schematic view of the cross-sectional structure at a in fig. 1.

Fig. 3 is a partially enlarged schematic view at B in fig. 2.

FIG. 4 is a schematic structural diagram of a first stationary mold in the present two-color injection mold.

In the figure, 1, a first fixed die; 11. a fixed die parting surface I; 12. avoiding an empty step; 2. a second stationary mold; 3. moving the mold; 4. sealing a glue step; 41. sealing the glue surface; 5. a gap; a. a first color forming cavity.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Specifically, as shown in fig. 1, the two-color injection mold comprises a first fixed mold 1 and a second fixed mold 2 with different cavities, and further comprises two movable molds 3 with the same cavities. As shown in fig. 2, a first color molding cavity a that conforms to the shape requirement of the first color injection molded article can be formed when the cavity of the first fixed mold 1 and the cavity of the corresponding movable mold 3 are closed. As shown in fig. 3 and 4, a first fixed mold parting surface 11 is provided, a mold body of the first fixed mold 1 is provided with a clearance step 12, and the parting surface of the first fixed mold 1 is the upper surface of the clearance step 12. The first fixed die 1 is provided with a sealing glue step 4 which is convex relative to the first fixed die parting surface 11 and has elasticity in a strip shape, and the sealing glue step 4 is located at the junction of the cavity of the first fixed die 1 and the first fixed die parting surface 11 and arranged along the shape of the edge of the cavity surrounding the first fixed die 1. The upper surface of the glue sealing step 4 is a glue sealing surface 41, the width of the glue sealing surface 41 is smaller than that of the fixed die parting surface I11, a gap 5 is formed between the fixed die parting surface I11 and the parting surface of the movable die 3 when the glue sealing step 4 and the movable die 3 are in contact die assembly, and when the die assembly force is increased and the die assembly is continued, the movable die 3 can extrude the glue sealing step 4 to be elastically deformed and close the gap 5.

Preferably, in this embodiment, an inner included angle between a side surface of the molding step 4 away from the cavity of the first fixed mold 1 and the molding surface 41 is an acute angle. The side surface of the glue sealing step 4 close to one side of the cavity of the first fixed die 1 and the inner included angle of the glue sealing surface 41 are obtuse angles. The width of the sealing glue surface 41 is 0.015-0.55 mm, and the ratio of the width of the sealing glue surface 41 to the width of the fixed die parting surface I11 is 0.1-0.5. The height of the projection of the sealing glue step 4 is 0.015-0.055 mm.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms of the first fixed mold 1, the fixed mold parting surface one 11, the clearance step 12, the second fixed mold 2, the movable mold 3, the glue sealing step 4, the glue sealing surface 41, the gap 5, the first color forming cavity a, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A double-color injection mold comprises a first fixed mold (1) and a movable mold (3), wherein the parting surface of the first fixed mold (1) is a first fixed mold parting surface (11), and the double-color injection mold is characterized in that the first fixed mold (1) is provided with a first sealing glue step (4) which is convex relative to the first fixed mold parting surface (11) and has elasticity, the sealing glue step (4) is positioned at the junction of a cavity of the first fixed mold (1) and the first fixed mold parting surface (11), the upper surface of the sealing glue step (4) is a sealing glue surface (41), and the width of the sealing glue surface (41) is smaller than that of the first fixed mold parting surface (11); when the movable die (3) is in contact with the glue sealing step (4) for die assembly, a gap (5) is formed between the fixed die parting surface I (11) and the parting surface of the movable die (3), and when the die assembly force is increased and the die assembly is continued, the movable die (3) can enable the glue sealing step (4) to be elastically deformed and enable the gap (5) to be closed.

2. A two-color injection mold according to claim 1, wherein the ratio of the width of the sealant surface (41) to the width of the first stationary mold parting surface (11) is 0.1 to 0.5.

3. The double-color injection mold according to claim 1 or 2, wherein the side surface of the glue sealing step (4) away from the cavity of the first fixed mold (1) and the inner included angle of the glue sealing surface (41) are acute angles.

4. The double-color injection mold according to claim 1 or 2, wherein the side surface of the glue sealing step (4) close to the cavity of the first fixed mold (1) and the inner included angle of the glue sealing surface (41) are obtuse angles.

5. Two-color injection mold according to claim 1 or 2, characterized in that the height of the projection of the sealing compound step (4) is 0.015mm to 0.055 mm.

6. Two-color injection mold according to claim 1 or 2, characterized in that the width of the glue sealing surface (41) is between 0.015mm and 0.55 mm.

7. Double-colored injection mold of claim 1 or 2, characterized in that the glue sealing step (4) is strip-shaped and follows the shape around the cavity edge of the first stationary mold (1).

8. Double-colored injection mold of claim 1 or 2, characterized in that, the die body of the first cover half (1) has a clearance step (12), and the cover half parting surface one (11) is the upper surface of the clearance step (12).