A compression collar is manufactured for use in reinforcing an interference fit between an end of a pipe and a fitting. A precursor form is injection molded using a cold-expansion material. The precursor form has a tubular body with an initially closed axial end and a bore that is initially blind formed in the other axial end. Material is removed from the initially closed axial end of the tubular body of the precursor form to form an opening in the initially closed axial end that connects to the bore thereby forming the compression collar. The opening has an inner periphery with a profile in axial cross section that is different than any profile in axial cross section of an inner periphery of the bore. The collar formed may lack knitlines and may include tabs formed during the removal step which help to position the collar on a pipe.

A compression collar is manufactured for reinforcing an interference fit between an end of a pipe and a fitting. A precursor form is injection molded using a cold-expansion material. The precursor form has a tubular body with an initially closed axial end and a bore initially blind formed in the other axial end. Material is removed from the initially closed axial end to form an opening that connects to the bore thereby forming the compression collar. The opening has an inner periphery with a profile in axial cross section that is different than any profile in axial cross section of an inner periphery of the bore. The collar formed lacks knitlines and includes tabs which help to position the collar on a pipe.

A machine including a mold which delimits an overmolding cavity, for receiving a hollow portion of a bi-material part, cooling means along the overmolding cavity, a core positionable inside the hollow portion and containing heating means for bringing the core to a heating temperature higher than 150° C., and an injector injecting an overmolding material, formed by the core and the hollow portion, for forming an inner portion of the bi-material part. In order to obtain the overmolded inner portion even if the hollow portion has poor heat resistance, the cooling means maintain the overmolding cavity at a cooling temperature lower than 110° C. while the core is brought to the heating temperature, while the overmolding material has been injected by the injector into the overmolding cavity.

By using a forming die having a fixed die and a movable die moving along a parting surface on the fixed die and by moving the movable die along the parting surface, to press and hold a sintered part between the movable die and the fixed die, to form a cavity around the sintered part except parts which abut on the fixed die and the movable die by the forming die, and to fill the cavity with melted material which becomes an exterior part, so that the sintered part and the exterior part are integrated by insert molding.

The present inventive concept relates to a method of manufacturing a pipe packing inserted into a housing having a hollow body shape to prevent fluid flowing inside a pipe from leaking to the outside, the method including: manufacturing the pipe packing by injecting molten rubber into a mold assembly having an outer mold and an inner mold, wherein the pipe packing is configured as a hollow body and comprises an outer circumferential part located outside of the pipe relative thereto, opposite surfaces provided in directions toward a middle of the pipe packing at opposite ends of the outer circumferential part, and an inner circumferential part provided toward a center portion of the opposite surfaces therefrom, wherein the inner circumferential part has a gap provided therein to be divided into opposite inner circumferential parts.

The resin injection gate is disposed at the pillar part. When the bearing cage is divided into first and second regions by an imaginary line connecting the resin injection gate and a weld to be formed at a position radially facing the resin injection gate, a resin reservoir that can store therein the melted resin is formed at the pillar part in only one of the regions. A circumferential distance between the resin reservoir and the weld is smaller than a circumferential distance between the resin reservoir and the resin injection gate. A cross-sectional area of a communicating part of the resin reservoir, which is configured to communicate with the pillar part, is equal to or less than a quarter of a cross-sectional area of the resin injection gate.

A process of making a wear-resistant actuating lever is disclosed. The wear-resistant actuating lever includes a lever body made of metal and an integrally molded cover layer made of a polytetrafluoroethylene-based material. The lever body includes a head segment having an upper major surface, a cam-forming surface, a through hole, and at least one upper concavity formed in the upper major surface. The integrally molded cover layer covers on the head segment and is molded thereon using plastic injection molding, and includes an upper portion covering an upper major surface, a cam portion covering a cam-forming surface, and an upper protuberance portion in the upper concavity.

A heterogeneous composite material and a method for manufacturing the heterogeneous composite material are provided. The heterogeneous composite material includes a first compression structure formed by compressing a first material, and a second compression structure formed by compressing a second material different from the first material, and disposed in close contact with the first compression structure, wherein at least a portion of the first compression structure and at least a portion of the second compression structure are disposed on both sides of a boundary surface existing in a circular shape with a predetermined radius with respect to a central axis in a state in contact with each other at the boundary surface.

Various systems and methods are provided for an electric motor of a vehicle, and particularly to an electric motor including a coolant spray ring. In one example, a method of manufacture comprises forming, via injection molding, a unitary motor spray ring including a plurality of axial grooves joined to a plurality of nozzle orifices.

A compression collar is manufactured for use in reinforcing an interference fit between an end of a pipe and a fitting. A precursor form is injection molded using a cold-expansion material. The precursor form has a tubular body with an initially closed axial end and a bore that is initially blind formed in the other axial end. Material is removed from the initially closed axial end of the tubular body of the precursor form to form an opening in the initially closed axial end that connects to the bore thereby forming the compression collar. The opening has an inner periphery with a profile in axial cross section that is different than any profile in axial cross section of an inner periphery of the bore. The collar formed may lack knitlines and may include tabs formed during the removal step which help to position the collar on a pipe.