Document Type and Number:
Japanese Patent JPS6234497
Kind Code:
B2
Abstract:
The process is used for producing grooved plates for adjustable chokes, such plates having a choke groove in one side whose change in cross-section along the length of the groove has to be very true, that is to say, keep to very tight size limits. For producing such grooved choke plates of synthetic resin to accurate size in a mold, the first step is cutting an undersize groove in a plate workpiece to make a positive pattern. The plate workpiece is then placed in a choke housing and the flow properties of the choke are measured. Thereafter, further machining of the plate workpiece is undertaken on the basis of the difference between the desired and the actual choke properties of the plate, and at the same time taking into account shrinkage of the synthetic resin on cooling down and becoming solid in an injection mold which is to be later produced as a negative pattern from the positive pattern. To take into account shrinkage of the synthetic resin material in the injection mold for more complex choke groove forms, the positive pattern is heated after measuring it and before producing the negative pattern sufficiently so that a change in the geometry or form of the choke groove is produced which is truly equal and opposite to the shrinkage of the synthetic resin material.
Inventors:
KURUTO SHUTOORU
HANSU HAINRITSUHI GURETSUTORI
HANSU HAINRITSUHI GURETSUTORI
Application Number:
JP8135682A
Publication Date:
July 27, 1987
Filing Date:
May 14, 1982
Export Citation:
Assignee:
FESTO KG
International Classes:
H01H43/28; B23P13/00; B23P15/24; F15C5/00; F16K3/08