No-load noise

Clutch noise.

When the clutch is engaged, many punching machine will make a “jingle” sound. This is the intermittent sound produced by the collision of the inertial force of the slider and the centrifugal force of the crankshaft. The factors that affect the noise of the clutch are: the magnitude of the impulse received when the clutch is engaged depends on the impact speed under a certain quality; it is also related to the rigidity and damping characteristics of the contact material itself. There are two types of clutches: rigid and friction. The rotary key is the most widely used in small and medium-tonnage presses. The noise is relatively high. The noise is caused by a series of impacts.

Gap noise of the punching mechanism

Due to производство and assembly errors and work requirements, there is inevitably a gap between the crank connecting rod slider of the punch press. The movement between them, from free movement to contact movement, will inevitably bring a strong impact, this noise frequency bandwidth, the high-frequency part is strong. The larger the gap, the higher the noise. In addition, when the gap is constant, the higher the number of slider strokes, the higher the noise ratio.

Motor noise

As a power source, the noise generated by the motor during operation includes electromagnetic noise, aerodynamic noise, and mechanical noise of the motor winding. The sound pressure level of motor noise is related to the power and speed of the motor. The electromagnetic noise of the motor is mainly caused by the interaction between the alternating electromagnetic field and the vibration of the rotor and the stator. Electromagnetic noise is generally high-frequency noise. The aerodynamic noise of the motor is mainly the cooling fan noise. For many motors, the cooling fan noise is the main noise source. Mechanical noise mainly includes the noise generated by the unbalanced force of some rotating moving parts and the noise generated when some parts vibrate

Load noise of punching machine

The causes of load carrying noise are the impact between the props and the workpiece or the discharge plate and the blank, the twisting and punching of the stamping process. Among them, the twisting and punching noise of the stamping process is the largest.

Punching noise

The noise is very different due to the different stamping process. Sheet metal blanking is more noisy than bending and drawing, and the noise of forming processes such as embossing, wave pressing, flanging, bending, and drawing is small.

Torsional noise

The torsional noise of the same type of ударить кулаком is related to the thickness, hardness, geometry, hammering speed, die clearance of the stamping parts, etc. The noise increases with the increase of these values. When the punching machine is working, the collision impact between the punch and the plate and the discharge plate and the blank is greatly enhanced, and the impact sound increases with the increase of the impact speed. Collision noise and subsequent material fracture sound can be measured separately, this measurement method has been put into practice. On the same punching machine, punching thick and hard materials is noisier than punching thin and soft materials. For thick ductile sheets, the impact noise is as large as the fracture sound.