Punch Press Machine: Development & Application

The development history of punch press:

1. Manual press:

2. Manpower press:

3. Power press:

4. Auto punch press:

The application of the punch press:

Applications: Used for punching, cutting, drawing, and compression forming of metal materials.

Exclusions: Not suitable for fabrication of fragile materials such as cast iron, wood, glass, and ceramics, or flammable materials such as magnesium alloys.

Features:

• Best suited for mass production, not ideal for single productions.
• High processing efficiency and high utilization rate of materials.
• Must be used with a mold, and each mold can only be used to make one product.

I. Basic knowledge of punch press

1.1 brief introduction to press function:

★ The essence of the punch press is translating the circular movement into a straight-line motion.

★ Function: Utilizes a transmission structure to generate the appropriate pressure and kinetic energy near the bottom dead center, in combination with a mold, causing the workpiece to undergo plastic deformation and produce the desired final product.

Punch press classification as per the slider movement:

II. Structure

Identification of punch points:

Crankshaft and eccentric gear

Crankshaft:

★ use when stroking < 400
★ low cost

Eccentric gear:

★ use when stroke > 400

★ high cost

2.1 C-type press structure introduction (crank single point)

C frame press component:

A1: Slider Component

A2: Balancer

A3: Die Cushion

Punch drive structure plan:

2.2 C-frame press (crankshaft double point) structure：

Teach you how to judge the crank punch：

• Crankshaft corresponds to connecting rod–>Connecting rod outside
• Crankshaft corresponds to guide post–>Guide column outside (The probability of being seen on the crankshaft closed punch is only 5%!)

2.3 Closed (crankshaft single point) press structure:

2.4 Closed (crankshaft double point) press structure:

★ Integrated body & three split body

• Integral body:

— Applicable table is relatively small, tonnage is relatively small;
— Tablet generally ≤ 2300 * 1250, tonnage ≤ 260T

• Three split body

— Applicable table is relatively big, tonnage is relatively big;
— Tablet generally ≥2500*1400, tonnage ≥300T

Three split bodies: use 4 reinforcing rod to connect the upper, middle and lower sides to a whole.

Three split body punch press:

2.5 Closed (eccentric gear single point) press structure:

2.6 Closed (eccentric gear double point) press structure:

2.7 High-speed punch press

III. Punch press peripheral equipment

Quick mold changing device: including the upper clamp die, the lower clamp dies, die lifter, die arm, hydraulic power units, etc.

IV. Punch press safety

For Personnel Safety:

(1) Machine Safety Design: Equipped with safety devices such as a two-hand operation device, emergency stop device, re-start prevention device, double solenoid valve, and chain devices.

(2) Safe Operation: Includes safety fencing, photoelectric safety devices, safety plugs and stops, alarms, and more.

For Machine Safety:

(1) Overload Protection: In the event of exceeding the machine’s capacity, an overload protection device will stop to protect the machine.

(2) Thermal Relay Protection: Prevents damage to the motor due to excessive current.