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Mold for Concentric Parts

IP.com Disclosure Number: IPCOM000085169D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Friery, EJ: AUTHOR [+2]

Abstract

In one form of power transmission system a smooth circular wheel mounted on an axle is utilized. Where the system requires a high degree of precision and constant speed, the concentricity of the outer work surface of the circular wheel with the axle must be closely controlled. This mold arrangement provides means for molding a wheel and axle with concentricity on the order of 10 mils, or less.

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Mold for Concentric Parts

In one form of power transmission system a smooth circular wheel mounted on an axle is utilized. Where the system requires a high degree of precision and constant speed, the concentricity of the outer work surface of the circular wheel with the axle must be closely controlled. This mold arrangement provides means for molding a wheel and axle with concentricity on the order of 10 mils, or less.

This mold, shown with its two halves separated, is designed for use in injection molding equipment. The mold consists of two hollow halves 2 and 4, generally designed to be brought together to define a cavity for receiving injected molten plastic. The hollow portion 6 of mold half 2 is laterally larger than cavity insert 8. Cavity insert 8 includes three or more accurately located tapered openings around its active portion.

Mold half 4 includes cavity insert 12, however in this mold half the insert is tightly secured to the mold. Cavity insert 12 includes a number of tapered pins 14 accurately located to precisely mate with tapered holes 10 in cavity insert 8. Two or more positioning posts 16 on mold half 2 in conjunction with two or more holes 18 on mold half 4, are provided for the general location and positioning of the two mold halves.

In operation, prior to bringing together mold halves 2 and 4 a shaft 20, shown in phantom, is included at the center of the active portion of the mold. As the two halves of the mold are brought together pins 14 m...