CN-121989414-A - Thermal trigger separation coating structure, toy production injection mold and injection molding process

CN121989414ACN 121989414 ACN121989414 ACN 121989414ACN-121989414-A

Abstract

The invention discloses a thermal trigger separation coating structure, a toy production injection mold and an injection molding process, wherein the injection mold comprises a mold core internally provided with a cavity, the mold core comprises an upper mold core and a lower mold core, the upper end surface of the upper mold core is provided with a plurality of first inflow channels and second inflow channels communicated with the cavity, the cavity comprises a frame part cavity and a plurality of part cavities, a plurality of first glue injection openings are arranged between the part cavities and the frame part cavity, the cross section area of the first glue injection openings from the frame part cavity to the part cavity is in gradient reduction, and the contact surface area between the first glue injection openings and the part cavity is The first inlet channel is led into the frame part cavity, the second inlet channel is led into the part cavity, a second glue injection port is further arranged between the second inlet channel and the part cavity, the cross-sectional area of the second glue injection port from the second inlet channel to the part cavity is in gradient reduction, and the contact surface area between the second glue injection port and the part cavity is 。

Inventors

PENG ZHI
XIE YURONG
LI XIAOMING
LIU YAOGUANG
PENG HUI
ZHANG CHI
CHEN CONGSHAN
ZHENG HAILIN
ZHANG MENGCHI
CHEN DERUI
CHEN SHANQIN
LI LIHUA

Assignees

东莞中擎塑胶电子科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260130

Claims (7)

1. The toy production injection mold is characterized by comprising a mold core (A), wherein a cavity is arranged in the mold core, the mold core comprises an upper mold core (A1) and a lower mold core (A2) which are in butt joint connection, a plurality of first inflow channels (A11) and second inflow channels (A12) which are communicated with the cavity are arranged on the upper end face of the upper mold core (A1), the cavity comprises a frame part cavity (A13) and a plurality of part cavities (A14) of the injection molding toy, a plurality of first glue injection ports (A15) are arranged between the part cavity (A14) and the frame part cavity (A13), the cross-sectional area of the first glue injection ports (A15) from the frame part cavity (A13) to the part cavity (A14) is in gradient reduction, and the contact surface area with the part cavity (A14) is The first inlet runner (A11) is led into the frame part cavity (A13), the second inlet runner (A12) is led into the part cavity (A14), a second glue injection port (A16) is further arranged between the second inlet runner (A12) and the part cavity (A14), the cross-sectional area from the second inlet runner (A12) to the part cavity (A14) is in gradient decrease, and the contact surface area with the part cavity (A14) is 。
2. The toy production injection mold of claim 1, further comprising at least one component flow module (B) configured above the mold core (A), wherein the flow module (B) comprises an upper flow distribution plate (B1) and a lower flow distribution plate (B2) which are in butt joint connection, an injection molding port (B11) is formed in the upper end face of the upper flow distribution plate (B1), a first butt joint groove (B21) is formed in the upper end face of the lower flow distribution plate (B2), a flow distribution channel (B22) is formed in the first butt joint groove (B21), a second butt joint groove (B23) and a plurality of outflow channels (B24) corresponding to the positions and the numbers of the first inflow channels (A11) and the second inflow channels (A12) are formed in the lower end face of the lower flow distribution plate (B2).
3. A toy production injection mold according to claim 2, wherein the first docking groove (B21) has an inner size and shape corresponding to an outer size and shape of the upper flow dividing plate (B1), the upper flow dividing plate (B1) is inserted and docked to an upper end surface of the first docking groove (B21), and the injection port (B11) communicates with a flow dividing passage (B22) inside the first docking groove (B21), and the flow dividing passage (B22) communicates with the outflow passage (B24) so that injection molding material flowing in from the injection port (B11) is divided by the flow dividing passage (B22) and then flows out from the outflow passage (B24).
4. A toy production injection mold according to claim 2, wherein the second docking groove (B23) has an inner size and shape corresponding to an outer size and shape of the upper mold core (A1), the mold core (a) is inserted into the inside of the second docking groove (B23) through the upper mold core (A1), and the outflow channel (B24) is docked with the first inflow channel (a 11) and the second inflow channel (a 12) so that the injection molding material flowing out of the outflow channel (B24) flows into the inside of the cavity through the first inflow channel (a 11) and the second inflow channel (a 12).
5. A toy production injection mold according to claim 1, characterized in that the mold inner wall surface at the position of the first glue injection port (a 15) is further provided with a thermally triggered release coating structure.
6. The toy production injection mold according to claim 5, wherein the thermally triggered release coating structure comprises a bonding layer, a functional layer and a surface layer sequentially deposited on the inner wall surface of the mold at the position of the first glue injection port (A15), wherein the bonding layer has a higher purity than that of the first glue injection port Titanium of the functional layer adopts Shape memory alloy, the surface layer adopts Tungsten doped diamond-like carbon.
7. An injection molding process is characterized by adopting the toy production injection mold according to any one of claims 1-6, and specifically comprises the following steps that S1, injection molding raw materials flow into a shunt module (B) from an injection port (B11) and flow out of an outflow channel (B24) after being shunted by a shunt channel (B22) in the shunt module (B), the injection molding raw materials flowing in from the injection port (B11) are shunted and divided to avoid overlarge injection pressure of subsequent injection molding, S2, injection molding raw materials flowing out from the outflow channel (B24) flow into a frame part cavity (A13) through a first injection runner (A11), injection molding raw materials flowing into the frame part cavity (A13) are further injected into the part cavity (A14) through a first injection runner (A15), S3, injection molding raw materials flowing out from the outflow channel (B24) are further directly injected into the part cavity (A14) through a second injection runner (A16) through a second injection runner (A12) to avoid overlarge injection pressure of subsequent injection molding, the injection molding raw materials are fully contacted with the injection molding part cavity (A) through the second injection runner (A16) and the injection molding part cavity (A14) after the injection molding raw materials are fully contacted with the injection molding raw materials at the first injection molding part cavity (A) and the injection molding part cavity (A14) at the first injection molding part cavity (B16) and the injection molding part cavity is fully heated, the heat-triggered release coating structure cools and then fully contracts when cooled to facilitate demolding.

Description

Thermal trigger separation coating structure, toy production injection mold and injection molding process Technical Field The invention relates to the technical field of injection molds, in particular to a thermal trigger separation coating structure, an injection mold for toy production and an injection molding process. Background In the field of injection molding production of toy parts, particularly in the molding of precision micro parts (such as doll joints, fine decorations and the like), how to balance gate trace minimization and demolding reliability is a long-standing technical difficulty, and the following problems are generally faced by the traditional injection mold: The gate mark is obvious if a conventional size injection gate (usually larger than ) After the parts are detached, obvious water gap (sprue) marks are left on the surface of the product, so that the appearance quality and the value of the toy are seriously affected, and the toy is unacceptable for toy products with high appearance requirements; demolding and damage to reduce the size of the nozzle to a minimum in order to solve the nozzle mark problem (e.g. as referred to in this solution ) Is a straightforward and efficient approach, however, the extremely small connection sizes present new risks: the injection filling is difficult, namely the resistance is extremely high when the melt flows through the tiny glue injection port, and the filling of the part cavity is not full due to insufficient injection, so that the defect of material shortage is generated; After cooling, the adhesion force between the plastic and the inner wall of the tiny glue injection port is relatively larger, and when demoulding, all the tensile stress is concentrated on the tiny connecting section, so that the part is easily broken at the glue injection port or whitened stress marks are generated, and the product is scrapped; the traditional method often uses a large amount of external release agent to solve the release problem, which not only increases the cost and affects the production takt, but also the residual chemical reagent can affect the secondary processing quality of subsequent spraying, electroplating and the like, and brings environmental protection problems. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide an injection molding process solution capable of ensuring full injection filling and safe and reliable demolding process while realizing ultra-small gate marks. In order to achieve the above purpose, the invention provides a toy production injection mold, which comprises a mold core and at least one component flow module, wherein the mold core is internally provided with a cavity, the mold core comprises an upper mold core and a lower mold core which are in butt joint connection, the upper end surface of the upper mold core is provided with a plurality of first inflow channels and a plurality of second inflow channels communicated with the cavity, the cavity comprises a frame part cavity and a plurality of part cavities of the injection molding toy, a plurality of first glue injection openings are arranged between the part cavities and the frame part cavity, the cross section area from the part cavity to the part cavity is in gradient reduction, and the contact surface area between the part cavity and the first glue injection openings isThe first inlet channel is led into the frame part cavity, the second inlet channel is led into the part cavity, a second glue injection port is further arranged between the second inlet channel and the part cavity, the cross-sectional area of the second glue injection port from the second inlet channel to the part cavity is in gradient reduction, and the contact surface area between the second glue injection port and the part cavity isThe split flow module is arranged above the die core and comprises an upper split flow plate and a lower split flow plate which are in butt joint connection, an injection molding opening is formed in the upper end face of the upper split flow plate, a first butt joint groove is formed in the upper end face of the lower split flow plate, a split flow channel is formed in the first butt joint groove, and a second butt joint groove and a plurality of flow outlet channels corresponding to the first flow inlet channels and the second flow inlet channels in position and number are formed in the lower end face of the lower split flow plate. The first butt joint groove has an inner size and a shape corresponding to the outer size and the shape of the upper splitter plate, the upper splitter plate is inserted and butted into the upper end face of the first butt joint groove, the injection port is communicated with the splitter channel in the first butt joint groove, the splitter channel is communicated with the outflow channel, so that injection molding raw materials flowing in from the injection port flow out of the outflow channel after