Today's steel business is not limited to "moving bricks". The most common value-added service in the supply chain is shearing. Quality or equipment problems encountered in the shearing process of the slitting machine are more difficult to identify and deal with than the original coil slitting defects.This article explains that many machining centers will have some similar common problems and solutions of slitting machine.

In the process of slitting and shearing of steel plates, many machining centers will have some similar common problems. The premise does not take into account the differences in equipment and equipment itself. For example, burrs, sickle bends, staggered coiling, uneven coiling, and edge waves after slitting. The most common of these are burrs and cambers.

What are burrs and cambers?

The burrs and cambers in the shearing process are similar to the defects in the main production line of the steel mill (continuous withdrawal, hot rolling, etc.), but are slightly different. The following is a physical map of common burrs and camber defects in shear processing.

Spiral imprints appear on the edge, and when the steel coil is unfolded, it will be found that the cross-section of the edge of the strip is inconsistent. One section is a cut surface, and the other is a torn surface, which appears alternately. The burr on the entire steel strip section is also large and wide. Tolerances vary widely and are essentially a form of camber. Similar fluctuations in the cut surface and width will not affect the use of users with low requirements, but will cause adverse effects on the follow-up processing of high precision and high quality, not to mention the production of products with a shearing accuracy of more than 0.1 MM.

Analysis of burrs and camber defects in slitting machine

The investigation and improvement of the two defects of slitting burr and camber are mainly focused on the slitting blade and its ancillary equipment. We can troubleshoot by detecting and controlling some key parameters. Inconsistent blade clearance will affect the stress distribution of the blade during shearing, and will also affect the stability of shearing for a long time. During the shearing process, the shearing edge is in a curved state, which not only causes burrs and sickle bending, but also causes edge waves in serious cases. .

Analysis of the causes of burrs and cambers:

1. Damage to the working face of the slitting spacer

The tolerance of the parallelism of the two ends of the longitudinal shear spacer is plus or minus 0.002mm. The smallest error of the bumps that can be found by the naked eye is more than 0.1mm. , which directly affects the precision and quality of the sheared product. The main reason for the damage of the spacer is still in operation and maintenance. For example, workers have not developed the habit of not handling with care, or they may fall or be injured during lifting or handling.

2. The problem of locking the blade and the spacer on the cutter shaft

In order to ensure the size of the product, the cutter shaft and the blade are generally combined together to form a complete whole. Once all the blades and spacers on the entire cutter shaft are not locked (as shown in the figure below), the external force of the reaction force of the strip will change, and the blades will rotate with the cutter shaft, which will directly lead to the generation of shear burrs. The solution is very simple, that is to ensure that it is locked. But whether the locking can be ensured is closely related to the device configuration. There are two common locking methods: hydraulic and mechanical.

3. The tool holder is not parallel

The shearing process is formed by the combined action of the upper and lower tool rests. If the upper and lower tool rests are not parallel, one of them is in an inclined state, which will also cause camber and burrs. It is relatively easy to solve the problem of non-parallel tool axes, which can be quickly solved by equipment experts by adjusting the worm gear and using professional testing equipment.

Slitting defects are not only about burrs and cambers, but also other common problems in production. Slitting production is a typical steel coil processing method. With the upgrading of the industry, as users have higher and higher requirements for product quality, they also put forward higher quality expectations for the slitting production line. Bangzhou Machinery specializes in the design and production of various sheet metal processing machinery, which can provide customers with one-stop high-quality services. If you have any doubts about the slitting machine processing and cutting, please email or call us. We are more than happy to serve you.