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NAPA Auto Parts was established in 1925. [30] Some NAPA Auto Parts stores are owned and operated by GPC, but most are independently owned and operated. [31] There were approximately 6,000 NAPA Auto Parts stores in 2020. [30] GPC acquired UAP Inc. of Canada in 1998 and the Australian car parts supplier Exego Group in 2013.
The selection criteria of all process parameters are governed by the sheet thickness and by the strength of the work-piece material being pierced. The punch/die clearance is a crucial parameter, which determines the load at the cutting edge of the tool, commonly known as point pressure. Excessive point pressure can accelerate tool wear.
A manual knockout punch can handle holes from 0.5 to 1.25 in (13 to 32 mm). The ratchet system has a custom ratcheting wrench that uses a ball screw to make the process faster and easier. This type of system has a mechanical advantage of approximately 220:1 and can punch holes up to 3 in (76 mm) in diameter in 10 gauge mild steel . [ 3 ]
Punching is a forming process that uses a punch press to force a tool, called a punch, through the workpiece to create a hole via shearing. Punching is applicable to a wide variety of materials that come in sheet form, including sheet metal , paper , vulcanized fibre and some forms of plastic sheet.
A drift "punch" is misleadingly named; it is not used as a punch in the traditional sense of the term. A drift punch, or drift pin, or lineup punch, is used as an aid in aligning bolt or rivet holes prior to inserting a fastener. A drift punch is constructed as a tapered rod, with the hammer acting on the large end of the taper.
Irwin Industrial Tools is an American manufacturer and distributor of hand tools and power tool accessories. It is owned by Stanley Black & Decker . It is best known for producing Vise-Grip locking pliers .