What Is a Turret Punch Press?
Turret punch pressing is a metal fabrication process for punching holes and shapes into metal sheets. This process is akin to using a paper punch on paper but on a much larger scale and is conducted with a die. A turret punch press machine comprises an upper die and a lower die, with a turret that houses various shapes of dies for versatility. Through numerical control (NC) programming, it enables precise punching and forming of metal sheets into detailed and complex designs.
Uses of Turret Punch Presses
Turret punch pressing is versatile, allowing for the production of parts from thin metal sheets across various industries, including automotive, medical, and home appliances. It supports the creation of intricate designs without the need for specific dies, making it suitable for both high and low-volume production at reduced costs. This method is particularly prevalent in sheet metal fabrication for its efficiency and flexibility.
Principle of Turret Punch Presses
The principle of turret punch pressing involves laying a metal sheet on a die and systematically punching out parts as per the NC data, which dictates the punch and die’s movement. This process’s accuracy depends on the turret’s positioning and the metal plate’s characteristics, emphasizing the need for precise control to achieve the desired outcomes.
Types of Turret Punch Presses
Turret punching encompasses several processes tailored to specific fabrication needs.
1. Punching
A direct cutting process where multiple punches extract parts from a metal sheet.
2. Hole Punching
Similar to punching, but focuses on creating holes with the punched out material often considered scrap.
3. Slit Processing
Creates slits in a metal sheet, leaving the part still attached to the sheet.
4. Trimming Process
Removes excess material from parts shaped by other methods, refining the final product.
5. Half Cutting Process
Punches partially through the metal sheet without fully separating the part.
How to Choose Turret Punch Presses
Selection involves considering the sagging and shearing effects caused by the punching process, which impacts the metal sheet’s integrity and surface smoothness. It’s crucial to manage burrs, a common byproduct that may necessitate additional finishing processes. Turret punch presses are generally suited for metal sheets up to 0.118 inches (3 mm) thick, with laser processing preferred for thicker materials.
Other Information on Turret Punch Presses
Types of Turret-Punching Machines
Turret punching machines are categorized by their design and mechanism.
1. Turret
Features turrets for continuous multi-die processing.
2. Single
Lacks a turret, using only a single die for simpler tasks.
3. Mechanical
Employs a flywheel as the power source, known for its impact but also for generating vibration and noise.
4. Hydraulic
Utilizes a hydraulic pump, allowing adjustable processing speeds with reduced vibration and noise.
5. Servo Motor
Driven by a servo motor for precise control over the processing amount and speed.