Insert Molding Oil Control Valve Holder Support
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Solution Overview
Problem
Existing methods for producing plastic cylinder head covers with integrated oil control valve holders during insert molding face challenges in preventing deformation of holes and scratches on mounting surfaces, leading to potential oil leakage issues.
Innovation Solution
A method and apparatus that utilize a pair of molds capable of approaching and separating, with an insert pin inserted into the oil control valve holder's hole and an abutment insert positioned against the mounting surface, to support the hole and surface during molding, preventing deformation and scratches by controlled pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the OCV holder is set with the mounting surface entirely abutted against the lower mold during insert molding, then deformation of the hole of the OCV holder is prevented, but scratches and deformation of the mounting surface occur due to excessive pressure
Solution Approach 1:
The invention applies local quality by providing selective support only at specific locations on the mounting surface rather than full surface abutment. Support pins are positioned at predetermined locations to provide localized reinforcement where the plastic material exerts pressure, preventing hole deformation while avoiding excessive pressure on the entire mounting surface that would cause scratches.
Solution Approach 2:
The support pins act as intermediary elements between the mold and the OCV holder. These pins transmit necessary support forces to prevent hole deformation while filtering out excessive pressure that would damage the mounting surface. The pins serve as a mediator that provides precise, controlled support without direct contact between the mold and the mounting surface.
2Object-affected harmful factors
If no support is provided during insert molding, then the mounting surface is protected from scratches, but the hole of the OCV holder deforms under plastic material filling pressure
Solution Approach 1:
The invention provides localized support at specific predetermined locations on the mounting surface using support pins. This local support prevents hole deformation under plastic material pressure while leaving the rest of the mounting surface free from excessive pressure, thus protecting it from scratches.
Solution Approach 2:
The support pins are positioned in advance before the insert molding process begins. This preliminary positioning ensures that support is already in place to prevent hole deformation during the plastic material filling process, while the pins are designed to not damage the mounting surface when removed afterward.
3Quantity of substance
If the hole of the OCV holder remains hollow during insert molding, then plastic material does not enter the hole, but the hole deforms during molding and contraction
Solution Approach 1:
The support pins serve as intermediary structures that maintain the hole's dimensional accuracy during insert molding. The pins prevent the hole from deforming under plastic material pressure while allowing the plastic material to be excluded from the hole interior, thus maintaining both the hollow state and dimensional precision.
Solution Approach 2:
The invention changes the physical state or configuration of the hole by introducing support pins that constrain the hole's dimensions during molding. This parameter change (adding mechanical constraint) prevents deformation while maintaining the hole's hollow state and preventing plastic material infiltration.
Data Source
AI summary
A method produces a plastic cylinder head cover having an oil control valve holder as an integral part thereof by insert molding. The method includes a step of setting the oil control valve holder in one of a pair of molds that can approach and separate from each other; and a step of clamping the pair of molds and injecting plastic material. In the step of injecting plastic material, the oil control valve holder is set in the one mold with an insert pin being inserted in a hole thereof.Another a method produces a plastic cylinder head cover having an oil control valve holder as an integral part thereof by insert molding. The oil control valve holder includes a mounting surface on which it is mounted to a cylinder head, a hole oriented along an axis inclined to a plane direction of the mounting surface, and two faces containing open ends of the hole. The method includes a step of setting the oil control valve holder in one of a pair of molds that can approach and separate from each other; and a step of clamping the pair of molds and injecting plastic material. In the step of injecting plastic material, the oil control valve holder is set in the one mold with an abutment insert being abutted against the mounting surface near one of the two faces having a larger area than the other.