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A countersink in sheet metal to put bolt head under surface
Thick turret countersink tooling is a specialized forming tool used in CNC turret punch presses.
1.Its primary purpose is to create the conical recess (the "countersink") needed to seat flat-head screws or rivets flush with the surface of the sheet metal. This allows flat-head screws or fasteners to sit flush with or below the surface of the metal sheet.
2.The key benefit is the elimination of a secondary operation like drilling or deburring, allowing the part to be completed entirely within the punch press, which significantly boosts efficiency.
3.Core FeaturesForming, Not Cutting: Unlike a standard punch, a countersink tool displaces the material rather than removing a slug.
4.The conical shape is created by pressing the sheet metal down into a matching die shape.
5.Pilot Punch and Form Ring: The tool typically operates in two stages within a single stroke:Pre-Piercing/Pilot: A preliminary hole must exist or be punched immediately before the countersink tool is used.Forming: The punch tip, which has the desired countersink angle (e.g., 82°or 90°), descends and presses the material around the pre-pierced hole into the die cavity, forming the recess.
Key Applications
The primary driver for using thick turret countersink tooling is to achieve flush fastening while consolidating manufacturing steps.
*Electronic Enclosures and Cabinets: Used extensively for access panels and chassis where the outer surface must be perfectly
smooth to allow mating parts to fit closely or for aesthetic reasons.
*Appliance and Commercial Equipment:
A.Components for refrigerators, ovens, HVAC systems, and vending machines that require flat surfaces for proper assembly and appearance.Vehicle and Transportation Components:
B.Parts where exposed fasteners are required to be flush to reduce aerodynamic drag or for safety/snag avoidance.
C.Any Application Requiring Secondary Operations Elimination: The most compelling application is in high-volume production runs where removing drilling, tapping, or grinding processes from the workflow provides immense time and cost savings. This single-stroke approach streamlines the entire fabrication sequence.
D.Mounting Points: Creating precise recesses for flat-head screws that need to be completely flush with the sheet metal surface for internal components to be mounted flatly on top.
Choose type A or type B as bolt head
Need punch correct hole before countersink forming. Advised 0.2mm of bolt sinking
Formdown type is popular. Replacable insert type is optional.
