Analysis on the quality problem of the inner wall cracking at the bottom of the steel drum
Analysis on the quality problem of the inner wall cracking at the bottom of the steel drum
The cracking of the inner wall of the bottom of the barrel is also a relatively common quality problem in the production of barrels. To find out the cause, it should be scientifically analyzed, and no conclusions can be drawn casually.
The common reasons in China are mainly the problems of the steel drum sealing machine, followed by the stamping die, material problems, etc. Please find them according to the specific situation.
1. The problem of steel drum sealing machine
Sometimes, when the pressure plate of the steel drum sealing machine is adjusted, when the steel drum is closed, the distance between the two pressure plates is too small, that is to say, the distance between the pressure plates exceeds the standard inner height of the steel drum. In this case , When the bottom cover of the barrel is assembled with the barrel body, the bottom cover of the barrel will be stretched twice, and the thinning tension of the inner wall of the bottom of the barrel during this secondary stretching is far greater than the thinning tension of the inner wall when the bottom cover is punched. . When the bottom cover of the barrel is made of a thinner steel plate, it is very likely that the material in this part will be cracked, or deformed to be broken, and it is easy to crack during use.
This kind of quality problem is relatively easy to confirm. First, use a depth gauge to measure the depth of the barrel bottom cover after stamping (before sealing assembly), and then measure the depth of the barrel bottom after sealing, and compare the two depth values. If the depth of the barrel bottom after sealing assembly is much larger than the depth of the barrel lid before assembly, it can be confirmed that this is the problem.
For example, a standard 200-liter steel drum requires a bottom depth of 19mm, but some companies may actually have a smaller size than the standard. I have seen a barrel factory before. The depth of the barrel bottom cover after stamping is only 16mm. In order to meet the requirement of the barrel bottom depth of the finished barrel of 19mm, by adjusting the distance of the sealing machine pressure plate, the distance between the sealing pressure plate and the steel barrel is too small. During the sealing process, the bottom cover of the barrel was stretched twice. Although the depth of the barrel bottom of the finished barrel reached 19mm, the quality problem often occurred at the same time, that is, the inner wall of the barrel cover was cracked. Later, in order to solve this problem, the thickness of the bottom cover of the barrel was increased from the original 0.9mm to 1.0mm, so as to prevent it from cracking.
