US 3,982,440 A · Method of determining molded part profile

Abstract

A method is provided for determining the profile of a molded part as a means of checking the quality of a given molded part and/or as a basis for effecting adjustments in the molding machine controls. In accord with the subject method a plurality of pressure sensings are taken simultaneously at different locations in the molding machine. These sensings are employed in accord with a known mathematical formula for establishing a profile of the part being molded wherefrom it is possible to determine the physical characteristics which the molded part will have. For purposes of establishing the profile of the part, the values of the pressure sensings in pounds per square inch are plotted against the distance from the gate at which the pressure is measured, the latter distance being indicated in suitable units of length. The method for determining the profile of a molded part is also operable for purposes of determining whether any material flow has occurred at a given location in the molding machine. The method of the present invention may be practiced either with molding machines which embody a single mold cavity or with those that embody multiple mold cavities.

Claims10

Dependent claims

The method for effecting a check of the quality of a part being molded in a molding machine comprising the steps of:

a. establishing a theoretical index effective to identify a part being molded during a cycle of operation of a molding machine as having the desired characteristics, said theoretical index being correlated for the particular material and mold being utilized in molding the part;
b. obtaining a first sensing of the level of pressure of the material in the molding machine by means of a first pressure sensor mounted at a first location in the molding machine in the path of flow of the material therein;
c. obtaining a second sensing simultaneous with the obtaining of said first sensing of the level of pressure of material in the molding machine by means of a second pressure sensor mounted at a second location in the molding machine in the path of flow of the material therein;
d. establishing an actual index for a part being molded in a molding machine through use of the information derived from said first sensing and said second sensing;
and
e. checking the quality of the part being molded by comparing said actual index with said theoretical index so as to establish if said actual and theoretical indexes are the same within predetermined tolerances that the part is of the proper quality and if said actual and theoretical indexes differ by more than the predetermined tolerances that the part is of inadequate quality and should be rejected.

3 more elements

Dependencies are inferred from the claim text.

Method of determining molded part profile

Life of this patent

Method of determining molded part profile

Life of this patent

Abstract

Claims10