CNC Punching
ACC-U-RATE Sheet Metal utilizes a Pullmatic 126 from Pullmax, one of the markets fastest and most efficient sheet-metal CNC turrent punching machines.
The machine's uses are practically limitless. The operator can do edge turning, flanging, shrinking, shearing, beading, slot cutting, louver etc. when using the proper tooling. In addition, customer supplied DXF or DWG files allows us to take your designs almost directly into our machine, assuring accurate, high quality product with the shortest possible lead time.
Capacities and Specification:
Machine Specification:
• 33Ton
• 15 Auto-Indexable Tool Stations
• up to 500 Hit Per Minute(HPM)
• 5000 Inches Per Minute(IPM) max table speed
• Sheet Size: 4’ x 8’; without auto repositioning
Material Capabilities:
• 5052 Aluminum: 0.032" - 0.250" thick
• Hot Roll Steel: Pickled & Oiled: 20 gauge - 1/4" thick
• Galvanized: 24 gauge - 10 gauge
• A36 Steel: 0.1875"
• 304 Stainless Steel: 22 gauge - 10 gauge
A punch press is a type of machine press used for forming and cutting material. It can be small and manually operated and hold one simple die set, or be very large; CNC (Computer Numeric Controlled) operated, and hold a much larger and complex die set.
The process of operation begins with the CNC controller commanding the drives to move in a particular x-y axis to a desired position. Once in position, the control initiates the punching sequence and pushes the ram to bottom dead center (BDC) and returns it to top dead center (TDC). The origins of BDC and TDC go back to older pitman type press machines. On today's machines BDC/TDC does not actually exist but is commonly used as a term to derive the top and bottom of a stroke of the ram. The punch enters the sheet metal, and pushes it through the die, obtaining the required shape of the punch and die set. This will form a slug of metal that is collected underneath the die and ejected to a scrap container.
The whole punching process on modern machines is extremely fast compared to older pitman style machines and thus gives rise to increased production volumes. The stroke sequence takes approximately 0.5 milli-seconds to complete and signals to the control the next movement command allowed after the ram has reached the top of its stroke.
Hydraulic punch presses, which power the ram with a hydraulic cylinder rather than a flywheel, and are either valve controlled or valve and feedback controlled. Valve controlled machines usually allow a one stroke operation allowing the ram to stroke up and down when commanded. Controlled feedback systems allow the ram to be proportionally controlled to within fixed points as commanded. This allows greater control over the stroke of the ram, and increases punching rates as the ram no longer has to complete the traditional full stroke up and down but can sequence within a very short time.