What Is A Punch Press?

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What Is A Punch Press?

There are many forming processes in sheet metal manufacturing, and punching is one of them.

Press the workpiece through the die to change the shape and size of the workpiece.

The shape or size of the workpiece is basically determined by the shape and size of the toolings.

Punch is mainly used for sheet metal processing, which can punch, perforate, pierce and slot.

Small punches can be operated manually, while large punches are controlled by CNC.

Small punch is suitable for batch production of small parts with uniform shape

The die size of the large punch is large and complex, and it has a multi-station turret.

The ram drives the punch up and down in the vertical direction to press the punch into the die.

The punch presses the die to punch, perforate and slot the workpiece.

The materials that can be processed by the punch press include cold-rolled steel, aluminum, bronze, etc.

There are two types of frames for punch press, C-frame or "door" frame.

The hydraulic cylinder of the C-type punch is on the beam, connected with the ram, and drives the ram.

The bottom plate of the C-type punch uses T-bolts to lock the mold bottom support.

The top and bottom of the punch are connected by the supporting strut and bushing assembly.

The oil cylinder of the gantry frame is installed in the center of the machine to prevent deflection and deformation.

Parts of Punch Press

Frame and worktable

The frame of the punch press is the external structure that supports the whole machine.

The control system and drive system of the punch press are supported by the frame.

Below the frame is the worktable of the punch press, which provides support for clamping the die and workpiece.

The size of the base determines the maximum size of the workpiece that can be processed.

The upper part of the frame is the beam, and the driving device, such as the hydraulic system, is installed on the beam.

Ram

The ram is connected with the power system to drive the punch to process the workpiece under pressure.

The up and down movement of the ram is within the range of fixed stroke and strength.

The up and down movement of the ram is called stroke, and the stroke and speed can be adjusted as required.

Connecting rod

The part connecting the ram and the crankshaft is called the connecting rod

Flywheel

The flywheel is a rotating high inertia body used to store the energy provided by the drive motor.

The flywheel stores energy to keep the ram moving at a steady speed.

The flywheel can prevent the speed from changing too fast or suddenly during the punching cycle.

In the non-working part of the punching cycle, the motor recovers the released punching energy to the flywheel.

Drive and control mechanism

The motor provides power to the crankshaft and an eccentric mechanism to drive the ram.

The control mechanism is used to control the length and power of the ram stroke.

Now, automatic control technology can more accurately control the stroke of the ram.

Punch and die

The punch is an important part of the punch, and the punch mainly processes the workpiece through the die.

The die is mainly used for cutting, punching, piercing, and forming workpieces.

A complete set of tool combinations includes the upper die and the lower die.

The workpiece is placed on the lower die and the punch is pushed into the lower die to form a hole in the workpiece.

Brakes

The brake of the press machine is very important for the safe operation of the machine.

The brake disconnects the drive shaft from the flywheel and stops the machine.

The emergency brake is located at the bottom of the machine and can quickly turn off the power.

Features of Punch Press

All parts of the press machine, such as the crankshaft, gear and transmission shaft, are hardened and heat treated after grinding, with high wear resistance.

This can ensure the stability of the machine's performance and the accuracy of the machine's operation.

The machine frame is welded with a steel plate, with high rigidity and accuracy.

And through heat treatment, the frame is stable, a load of each component is uniform, and the rigidity is balanced.

The brake of the press is highly sensitive, with a double electromagnetic control valve and an overload protection device.

This can ensure that the ram and punch can move and stop accurately and safely.

Automatic feeding systems can realize fully automatic production, improve efficiency and reduce cost.

The automatic feeding system is equipped with error detection, pre-cutting and pre-breaking devices.

It can quickly and safely adjust the ram manually and electrically, with high accuracy and convenience.

How does A Punch Press work?

The power source of the punch press operation is the motor, and the main motor drives the flywheel.

The connecting rod and clutch are connected to the crankshaft, and the flywheel drives the crankshaft.

The whole drive system drives the ram to move up and down and converts the rotary motion into linear motion.

Punches are installed on the ram and the die is installed on the base.

During operation, the punch moves vertically downward to punch a hole in the material and enter the lower die.

The blank produced by the punch is used for subsequent workpiece processing.

CNC punching machine mainly controls the punching process by computer.

Conclusion

This article introduces the definition, composition, characteristics, and working principle of the punch press.

I believe you already know one or more aspects of the punch press.

If you need more information about punch press and other machines, please feel free to contact us.

FAQs

Application of punch press

Using the punch press can improve efficiency, save energy and reduce cost.

And the technical requirements for the operator are not so high.

The punch press can process various workpieces through various toolings.

The specific processes include blanking, stamping, deep drawing, trimming, fine blanking, riveting, extrusion, etc.

The workpieces made by the punch press are widely used in many items, such as aircraft, ships, computer cases, cabinets, sockets, etc.

What is a mechanical punch press?

Mechanical punches are divided into full rotary punches and partial rotary punches according to brakes and clutches.

The full rotation of the crankshaft of the full rotation punch can stop the punch press. This machine is dangerous.

Partial rotary punches are equipped with rotary clutches and brakes, which can safely stop the machine.

What is a hydraulic punch press?

The hydraulic punch press is driven by a hydraulic cylinder, which exerts a great force on the metal.

The stroke of the hydraulic punch press is controlled by the feedback valve.

This improves the accuracy of the ram movement and the accuracy of the punching.

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