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CN-121989417-A - Automobile plastic spoiler shearing-free gate injection molding control method and mold thereof

CN121989417ACN 121989417 ACN121989417 ACN 121989417ACN-121989417-A

Abstract

The invention relates to a method for controlling injection molding of a shearing-free pouring gate of an automobile plastic spoiler and a mold thereof, and relates to the technical field of automobile part processing, wherein the method comprises the steps of responding to a glue injection signal, obtaining product information and a mold structure; the method comprises the steps of reading runner parameters, a cavity structure, a gate position and a gate size from a mold structure, determining a glue feeding component and a flowing distance corresponding to the gate position according to the cavity structure, matching corresponding required flow speed based on the glue feeding component, determining gate required pressure according to the gate size, the required flow speed and product information, determining injection molding required pressure according to the runner parameters, the gate required pressure and the flowing distance, determining valve needle opening corresponding to the gate position according to the product information, the injection molding required pressure, the flowing distance and the required flow speed, integrating the gate position and the valve needle opening, determining and executing a valve needle control instruction. The invention has the effect of reducing the residual gate solidification material after injection molding is completed.

Inventors

  • LI BIZHENG

Assignees

  • 台州市黄岩正谊模具有限公司

Dates

Publication Date
20260508
Application Date
20260408

Claims (10)

  1. 1. A method for controlling the injection molding of a shearing-free pouring gate of an automobile plastic spoiler is characterized by comprising the following steps: S10, responding to the glue injection signal, and acquiring product information and a mould structure; s11, reading runner parameters, a cavity structure, a gate position and a gate size from a mold structure; s12, determining a glue feeding component corresponding to the gate position and a flowing distance according to the cavity structure; S13, matching corresponding required flow rates based on the glue feeding components; s14, determining the gate demand pressure by combining the gate size, the demand flow rate and the product information; S15, determining injection molding demand pressure according to the runner parameters, the gate demand pressure and the flow distance; s16, determining the valve needle opening corresponding to the gate position by combining the product information, the injection molding required pressure, the flow distance and the required flow velocity; And S17, integrating the gate position and the valve needle opening to determine and execute a valve needle control command.
  2. 2. The method for controlling the injection molding of the shearing-free pouring gate of the automobile plastic spoiler according to claim 1, wherein the method for determining the opening degree of the valve needle comprises the following steps: s20, reading the viscosity of the plastic from the product information; S21, determining the actual pressure of the gate by combining the viscosity of the plastic, the injection molding demand pressure and the flow distance; s22, determining a full-open flow rate according to the actual pressure of the gate, the viscosity of the plastic and the size of the gate; S23, determining a flow speed difference value by combining the full-open flow speed and the required flow speed; and S24, matching the opening degree of the valve needle based on the flow velocity difference value and the plastic viscosity.
  3. 3. The method for controlling the injection molding of the shearing-free pouring gate of the plastic spoiler of the automobile according to claim 2, wherein the method for correcting the valve needle control command comprises the following steps: s30, determining a filling ratio corresponding to a preset filling time length according to a cavity structure, a required flow rate and a glue feeding component; s31, matching corresponding reduction coefficients through filling duty ratio; S32, correcting the opening of the valve needle based on the reduction coefficient until the filling duty ratio is consistent with the preset filling duty ratio; and S33, correcting the valve needle control command by combining the filling time length and the corresponding corrected valve needle opening.
  4. 4. A method of controlling a shear-free gate injection molding of an automotive plastic spoiler according to claim 3, wherein executing the valve pin control command comprises: S40, collecting gate measurement pressure based on the filling time length; s41, determining a gate planning pressure corresponding to the filling time according to the plastic viscosity, the gate actual pressure and the valve needle opening; S42, determining a pressure deviation degree through the gate measurement pressure and the gate actual pressure based on the same filling time length; S43, when the pressure deviation degree is larger than a preset pressure threshold value, determining a pressure difference value by combining the gate measurement pressure and the gate actual pressure; s44, matching the thickness of the condensation layer through the pressure difference value; s45, determining an ejection distance by combining the opening of the valve needle and the thickness of the condensation layer; and S46, controlling ejection of a thimble preset at the end part of the valve needle (131) based on the ejection distance.
  5. 5. The method for controlling shear-free gate injection molding of an automotive plastic spoiler according to claim 4, comprising, before collecting gate measurement pressure: s50, matching a flow speed threshold value and a wall thickness threshold value according to the viscosity of the plastic and the size of the gate, and matching a diversion distance according to the opening of the valve needle; s51, acquiring the wall thickness of a cavity corresponding to a glue feeding position based on the cavity structure; S52, defining a glue feeding position corresponding to a position where the required flow speed is larger than a flow speed threshold value and the wall thickness of the cavity is smaller than a corrected wall thickness threshold value as an abnormal position; and S53, controlling ejection of the ejector pins based on the abnormal position and the diversion distance.
  6. 6. The method for controlling injection molding of a shearing-free gate of an automotive plastic spoiler according to claim 5, wherein controlling ejection of the ejector pins based on the abnormal position and the guide distance comprises: S60, acquiring the size of a thimble; S61, determining the flow area by combining the thimble size and the gate size; s62, replacing the flow area with the gate size in S22 to S24 to obtain the corrected valve needle opening; and S63, correcting the diversion distance based on the corrected valve needle opening.
  7. 7. The method for controlling injection molding of a shearing-free gate of an automotive plastic spoiler according to claim 5, wherein the method for determining the ejection distance comprises: S70, judging whether the position is an abnormal position or not based on the glue feeding position; s710, if the position is an abnormal position, taking the thickness of the condensation layer as an ejection distance; And S711, if the position is not the abnormal position, summing the diversion distance and the thickness of the condensation layer to obtain the ejection distance.
  8. 8. The automobile plastic spoiler shear-free gate injection molding mold is applied to the automobile plastic spoiler shear-free gate injection molding control method according to any one of claims 1 to 7, and comprises a mold main body (1) with a cavity (11), wherein an inclined surface (111) matched with the spoiler inclined surface main body is arranged in the cavity (11), an injection molding opening (12) for injecting molten plastic into the cavity (11) and a split gate (13) which is perpendicular to and attached to the inclined surface (111) are arranged on the mold main body (1), the injection molding opening (12), the split gate (13) and the cavity (11) are sequentially communicated, and the joint of the split gate (13) and the inclined surface (111) is in smooth transition.
  9. 9. The automobile plastic spoiler shear-free gate injection molding die of claim 8, wherein a valve needle (131) for controlling the glue inlet flow of the shunt gate (13) is arranged in the shunt gate (13) in a penetrating manner.
  10. 10. The automobile plastic spoiler shear-free gate injection molding die according to claim 9, wherein a plurality of the flow distribution gates (13) are provided, and a flow distribution plate (14) for guiding the flow distribution of the molten plastic into all the flow distribution gates (13) is provided between the flow distribution gates (13) and the injection molding port (12).

Description

Automobile plastic spoiler shearing-free gate injection molding control method and mold thereof Technical Field The invention relates to the technical field of automobile part processing, in particular to a shearing-free pouring gate injection molding control method and a die thereof for an automobile plastic spoiler. Background The spoiler is an automobile part for optimizing the airflow of an automobile body, and the core is that through the inverted wing-shaped section and a specific installation angle, downward pneumatic downward pressure is generated at high speed to offset the lifting force of the automobile tail, and meanwhile, tail vortex is combed, so that the pneumatic resistance is reduced. At present, a spoiler is generally produced by adopting a plastic injection molding process, in order to further reduce the processing and assembly cost, an integrated injection molding design is generally adopted in the industry, namely, a function piece mounting structure is preset in a mold development stage, so that the function structure and a spoiler inclined surface main body are integrally injection molded, a subsequent manual assembly link is omitted, and the production efficiency is improved. However, the additional arrangement of the functional structure enables the inclined surface main body of the spoiler to be unable to form a right layout with the conventional injection molding port, and is limited by the space interference of the functional structure, and the conventional injection molding port is arranged at a position which is required to be far away from the inclined surface main body of the spoiler, so that long-gate solidification materials remain after injection molding is finished, and the cost of manual cleaning and waste recycling is increased. Disclosure of Invention The invention provides a shearing-free gate injection molding control method of an automobile plastic spoiler and a mold thereof in order to reduce gate congeals remained after injection molding. In a first aspect, the application provides a method for controlling injection molding of a shearing-free pouring gate of an automobile plastic spoiler, which adopts the following technical scheme: A method for controlling the injection molding of a shearing-free pouring gate of an automobile plastic spoiler comprises the following steps: S10, responding to the glue injection signal, and acquiring product information and a mould structure; s11, reading runner parameters, a cavity structure, a gate position and a gate size from a mold structure; s12, determining a glue feeding component corresponding to the gate position and a flowing distance according to the cavity structure; S13, matching corresponding required flow rates based on the glue feeding components; s14, determining the gate demand pressure by combining the gate size, the demand flow rate and the product information; S15, determining injection molding demand pressure according to the runner parameters, the gate demand pressure and the flow distance; s16, determining the valve needle opening corresponding to the gate position by combining the product information, the injection molding required pressure, the flow distance and the required flow velocity; And S17, integrating the gate position and the valve needle opening to determine and execute a valve needle control command. Through adopting above-mentioned technical scheme, based on the relative distance of moulding plastics mouth of die cavity structure and runner position, each advance gluey position and correspond the advance gluey component, velocity of flow and the pressure of runner, realized the differentiation control of needle aperture for the molten plastics of different positions can evenly pour into the die cavity in the same time, guarantees the stability of injecting glue. Optionally, the method for determining the opening of the valve needle includes: s20, reading the viscosity of the plastic from the product information; S21, determining the actual pressure of the gate by combining the viscosity of the plastic, the injection molding demand pressure and the flow distance; s22, determining a full-open flow rate according to the actual pressure of the gate, the viscosity of the plastic and the size of the gate; S23, determining a flow speed difference value by combining the full-open flow speed and the required flow speed; and S24, matching the opening degree of the valve needle based on the flow velocity difference value and the plastic viscosity. Through adopting above-mentioned technical scheme, utilize the demand pressure of moulding plastics of same mouth of moulding plastics, combine the runner actual pressure and the full-open velocity of flow that the different flowing distance calculation advances the gluey position and correspond, match the needle aperture that corresponds according to the difference value between full-open velocity of flow and the demand velocity of flow for the actual velocity