Method for forming contact of electrical connector and press die for practicing the method
AssigneeHon Hai Precision Ind. Co., Ltd.
InventorsTsang-Chien Shih, Kuo Ching Lee
Life of this patent
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Abstract
A press die for forming a contact of an electrical connector by blanking a metal sheet is disclosed. The die has a die insert for shaving an engaging section of the contact for electrically engaging with a conductive portion of a device mating with the electrical connector so that an electrical connection between the connector and the device is created. A profile of the die insert for the shaving operation is subject to a final finishing process by an ultrasonic machining using a machining agent consisted of diamond particles dispersed in liquid, wherein the diamond particles have a grit size of 8000#. The profile of the die insert has a surface roughness of 0.08 Ra.
Claims11
A method for forming a contact of an electrical connector, comprising the following steps:
- a. blanking a metal sheet to form a carrier portion thereon;
- b. blanking the metal sheet to form a contact portion of the contact thereon, the contact portion being used for clamping a mating device inserted into the electrical connector, the contact portion having an engaging section for electrically engaging a conductive portion of the mating device to establish an electrical connection between the electrical connector and the mating device;
- c. shaving the engaging section by a die insert so that the engaging section can have a smooth surface and precise dimension, the profile of the die insert for shaving the engaging section being subject to a final finishing process by an ultrasonic machining.
A method of making a precise dimension and a smooth surface of an engaging section of a contact from a metal sheet, comprising the steps of:
- blank the metal sheet by a die block to generally obtain a profile of the engaging section on an engagement side of said engaging section wherein a distance is defined between an outer profile of the die block and a final predetermined profile on said engagement side of the engaging section;
- and
- trimming/shaving the engagement side of the engaging section by a die insert, said die insert including a base with a portion projecting above said base with an outer profile configured and dimensioned to comply with said final predetermined profile on the engagement side of the engaging section.
Dependencies are inferred from the claim text.