Methods, systems, and apparatus, including medium-encoded computer program products, for injection molding warp prediction include: obtaining a mold model and measured shrinkage data for at least one material, predicting an amount of warpage for a part manufactured using the mold by computational simulation of an injection molding process, where the computational simulation uses an internal residual stress model for the part that uses calibrated values for both a coefficient of thermal expansion and an elastic modulus and/or a Poisson's ratio of the at least one material, in at least one direction, for at least thermal stress due to cooling and pressure compensation during and/or after a packing phase of the injection molding process, in accordance with the measured shrinkage data for the at least one material, and providing the amount of warpage predicted for the part manufactured using the mold.

An anti-warping design method for designing a resin molded article on a programmed computer includes dividing the molded article into a plurality of small elements, calculating sensitivity values for at least part of the elements with respect to warpage of the molded article, and displaying a distribution of the sensitivity values.

A medical syringe barrel and a manufacturing method for producing the same can be completed as a molded article by injection molding of a synthetic resin material without requiring post processing like polishing and can fill and administer a predetermined amount of the internal-use solution accurately. A medical syringe barrel includes a tubular barrel section for accommodating an internal-use solution in the interior thereof, an injection nozzle section formed at one end of the barrel section, and a flange section formed at an opening section on the other end of the barrel section to project radially outward. A surface of the flange section has a recess portion, and a weld line which is potentially formed by injection molding is not formed in the internal-use solution filled section.

A method produces an injection molded part. A plastic material is injected into a cavity for forming the injection molded part. The plastic material in a flow line region of the cavity, where the plastic material from two directions coincides during an injection molding process, is at least partially removed from the cavity via at least two overflow points and, in so doing, is locally swirled or mixed between the overflow points.

Thermoplastic synthetic resin flowing through both gates 173, 173 into lug part flanges 16, 16 collides with a confronting wall 161, converts direction of flow by 90°, changing velocity of flow, and thus fills the lug part flanges 16, 16 and flanges 15,15 on the long side. After this, as thermoplastic synthetic resin flows into thin outer peripheral walls 131, 132 and partition walls 133 at an optimum velocity of flow, thermoplastic synthetic resin flows smoothly and it is possible to form a smooth molded article. The lug part flanges 16,16 and the flanges 15, 15 on the long side serve as runners, so that thermoplastic synthetic resin flows smoothly into the thin outer peripheral walls 131,132 and partition wall 133.

A manufacturing method of a wire harness which includes at least one bundle of an electric wire group in which a plurality of electric wires are linearly arranged, and a damming part made of a resin material surrounding a part of the electric wire group in an extending direction of the electric wire group and including an outer periphery shape part according to an inner peripheral shape of an electric wire group insertion part, the manufacturing method includes a mold clamping step of disposing a part of the one bundle of the electric wire group and mold clamping an upper mold and a lower mold and an injection step of performing low pressure injection of a larger amount of molten resin than a volume of a cavity into the cavity.

A method for producing a connecting part (28) uses an injection foam molding process. In a first step, a fastening part with adhesive and/or hooking elements (18), forming a component of a contact fastener, is produced and introduced into an injection mold (2) as an insert part (16). A support part (26) is formed in the mold in a second step using a foamed synthetic material (22). The support part is connected to the insert part to form the connecting part (28).

A method of coating a surface of an interior component for a vehicle may include coupling a mold cavity on the interior component seated on a core and closing the mold cavity, and coating a surface of the interior component by injecting polyurethane into an interior of the coupled mold cavity and the core.

A method for producing a molded product 70 involves the use of a mold 40 including a cavity 44 to which a molding material is supplied and an intercepting member 45 capable of moving back and forth within the cavity 44. The method comprises an interception step for moving the intercepting member 45 into the cavity 44 and an injection step for injecting the molding material into the cavity 44. During the injection step, the intercepting member 45 is used to regulate the flow of the molding member inside the cavity 44 at the initial stage of the injection. The intercepting member is thereafter pulled into the mold 40.

A method for manufacturing a plastic speaker grill is provided. The method includes the steps of providing a base member having a first side and an opposing second side and defining a thickness therebetween. The base member has a plurality of spaced blind holes wherein the first side is in communication with the plurality of blind holes and the second side defines a surface that is generally uniform and uninterrupted. The method further includes cutting the base member proximate the second side to remove a portion of the base member and define the speaker grill, and in response to cutting the base member, exposing the blind holes wherein the blind holes define apertures that extend completely through the speaker grill. A plastic speaker grill is provided having tightly-spaced and miniscule apertures.