Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/76—Measuring, controlling or regulating
  • B29C45/7693—Measuring, controlling or regulating using rheological models of the material in the mould, e.g. finite elements method
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks

Definitions

• the invention relates to a production method applying novel operation steps and processes in plastic injection system preventing micro-scratches formed on patterned surfaces during production of vehicle interior plastic parts.
• the polymer raw material is melted by using injection machine and mould filling is performed under a certain pressure. Afterwards, the pattern geometry is copied by applying backpressure onto the material which is filled.
• this pressure is not given exactly, the molten material that does not penetrate into the surface causes fluctuation of the surface.
• excessive pressure also makes it difficult for the material to be separated from the surface after cooling.
• the deep contact of the plastic material with the sharp steel surface causes scratches.
• the invention relates to a patterned plastic surface production method, which meets the above said requirements, eliminates all of the drawbacks, and brings some additional advantages.
• the main purpose of the invention is to optimize the plastic pressure and temperature in the mould, thanks to the production method used.
• a purpose of the invention is to remove cosmetic faults of vehicle interior patterned plastic parts in the automotive sector, thanks to the method used.
• Another purpose of the invention is to provide quality production by achieving the required dimensional and visual quality conditions.
• Another purpose of the invention is to prevent labour losses and economic losses by providing quality and error-free products.
• a purpose of the invention is to ensure the desired level in patterned plastic surface brightness, body mounting tolerances, and targeted weight, thanks to the method used.
• the present invention is a patterned plastic surface production method by means of an injection system and a closure system, and it is characterized in that; it comprises the operation steps of:
• a mould filling analysis which consists of the steps of determining the required pressure value in the closure system, selecting the distance between the hot runners, selecting the number of hot runners, and selecting the mould steel temperature variation interval,
• a filling stage is carried out, in which ninety five percent of the volume of the patterned plastic surface is filled, in order to control of the mould filling analysis,
• an ironing stage is carried out, in which the remaining portion is filled with pressure and the pattern surface is copied,
• a closure stage is carried out, in which the female mould and the male mould are combined and the required tonnage is applied.
• Figure 1 is a two-dimensional view of the injection system and the closure system which allow the production of the patterned plastic surface according to the invention.
• Figure 2 is a schematic view showing the production method steps of the patterned plastic surface according to the invention.
• FIG. 1 is a two-dimensional view of the injection system (200) and the closure system (300) which allow the production of the patterned plastic surface (100) according to the invention.
• the invention allows removing cosmetic faults of vehicle interior patterned plastic parts in the automotive sector, preventing micro-scratches formed on the pattern surfaces of vehicle interior plastic parts, and optimizing the plastic pressure and temperature in the mould, thanks to the production method used.
• the invention relates to a patterned plastic surface (100) production method by means of an injection system (200) and a closure system (300).
• a mould filling analysis (A) is carried out which consists of the steps of determining the required pressure value in the closure system (300), selecting the distance between the hot runners, selecting the number of hot runners, and selecting the mould steel temperature variation range.
• the injection stage (B) is carried out where pressure-velocity profiles are applied until the geometry of the patterned plastic surface (100) is filled up to hundred percent.
• a filling stage (C) takes place, where ninety five percent of the volume of the patterned plastic surface (100) is filled.
• ironing operation (D) is carried out, in which the remaining portion is filled with pressure and the pattern surface is copied.
• cooling stage (E) takes place, in which the patterned plastic surface (100) is kept in the mould for solidification.
• a sensor (303) is found, which provides the measurement of the temperature and pressure values from the male mould (301 ) surface, for the patterned plastic surface (100) production method closure stage (F), in which the female mould (302) and the male mould (301 ) are combined and the required tonnage is applied.
• the production method of the patterned plastic surface (100) consists of the steps of mould design changes and plastic injection process parameter improvements.
• Mould Design mould filling analysis is performed by using the CAD data of the product to be produced. The purpose of this analysis is to ensure that error modes are monitored before the pattern is formed. Filling, pressure, temperature, etc. values are checked. Filling can be done with the desired number of runners, such as 2, 3, 10 etc. Factors affecting the pressure value are the number of runners, runner diameter, melt temperature, distance between the runners, and material wall thickness. Simulation is repeated in different combinations by entering appropriate values for runner diameter and number of runners.
• the required pressure value in the closure system (300) is selected to be in the range of 30 MPa to 40 MPa, the distance between hot runners in the range of 150 mm to 300 mm, and the mould steel temperature variation between +5 ° C to -5 ° C. Once these values are rea ched, the situation analysis is completed. Then moulding operation starts.
• An injection system (200) and a closing system (300) are found to perform the moulding process.
• the injection system (200) is melted due to the friction energy generated during rotation of the material conveying component (206) in the form of plastic granules (201 ) and the heat energy of the heater components (203).
• the conveying component (206) is found in a barrel (202).
• the plastic granules (201 ) are dropped into the barrel (202) through the inlet chamber (205) conveying the plastic granules (201 ) on the barrel (202), and then placed at the tip part in molten form with the rotation of the conveying component (206).
• the screw-form conveying component (206) is placed on the female mould (302) surface.
• the closure system (300) consists of the female mould (302) and the male mould (301 ) sections.
• the female mould (302) is a patterned surface, while the male mould (301 ) is a patternless surface.
• the female mould (302) and the male mould (301 ) are closed to apply a certain closure force. This force is directly proportional to the projection area of the part and the viscosity of the material.
• a single sensor (303), measuring the pressure and temperature, is found on the surface of the male mould (301 ) and flashes with the generated force.
• the molten material is filled into the mould by using the conveying component (206) mould interior hot runner manifold.
• the pre-simulated flow profile is applied sequentially in order to eliminate visual problems. The above given values are entered. The filling takes place continuously in one direction and is carried out by sequential runner operation.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=58361069

Family Applications (1)

Country Status (2)

Family Cites Families (3)

• 2017
  • 2017-02-06 EP EP17712265.2A patent/EP3562643A1/de not_active Withdrawn
  • 2017-02-06 WO PCT/TR2017/050051 patent/WO2018143900A1/en unknown

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