With the increasingly fierce competition in the product market, users’ requirements for product quality are increasing, and steel drums as metal packaging containers do not fall. Despite the fact that domestic drum manufacturers are adopting newer equipment and improving process equipment to varying degrees, Improve product quality, but there are many unsatisfactory areas, this article from the manufacturing process requirements of steel barrels, describes the factors that affect product quality and solutions and suggestions.
The quality of steel drum products mainly reflects from three aspects: whether the crimp quality is leakage at the crimped edge, whether there are burrs, corners and iron tongues, etc.; the quality of the weld seam is whether the surface of the seam is flat and there is no exposed welding. And the phenomenon of leakage; appearance quality that the paint film is smooth, the color is uniform, wrinkles and runny phenomenon and whether the adhesion of the paint film is firm.
Judging from the process investigation in the same industry in the country, the edging thickness of the barrel body is excessive, which is the main factor affecting the quality of the barrel crimping. Therefore, we analyze the quality of the barrel body edging as a subject.
Process requirements and status
The technical requirements for 200L steel drums are that the thickness of barrel body is 0.8mm, and the appearance is free from scratches and bumps. However, the measured result is a thickness of 1.1-1.2 mm, that is, the grinding amount is only 0.05-0.15 mm, so the process requirements are not satisfied.
The influence of process quality on product quality
The main purpose of the edging process is as follows: First, the surface condition of the seam welding of the barrel plate is improved, oil, rust, and scale are removed so that the seam welding quality is ensured, ie, the welding strength and leakage resistance of the finished barrel are ensured. Characteristics; Second, to reduce the thickness of the gap welding edge, so that the weld will not be too thick and affect the subsequent process, especially the quality of the crimping process. The welding seam is too thick and often causes the weld seam to overlap the layer at the edge of the seam more than other parts, and the degree of tightness of the curling at the other parts is inconsistent, resulting in an “triangular†leakage or full circle leakage. This is a fatal weakness that affects product quality.
The reason that affects the quality of the process
There are many reasons for excessive edging thickness, but there are mainly the following factors:
Due to the constraints of process, tooling and production equipment, it is difficult to achieve thickness requirements
According to the survey, most domestic barrel-making enterprises generally use steel bucket barrel edging machines or wheel edging machines. The structural features of the grinding wheel edging machine are composed of eight grinding wheels, each of which is up and down. The sheet material of the steel barrel barrel is driven by the stopper and is fed into the narrow gap of the upper and lower grinding wheels along the conveyor chain. Both ends are simultaneously ground under the grip of the upper and lower grinding wheels. Since the front and back sides of the steel plate are ground at the same time, the amount of grinding once can not be too large, otherwise warping or scorching, high temperature oxidation, etc. will occur, and the welding will be adversely affected. The barrel-making enterprises use ordinary edging for the grinding of ordinary steel plates. This is the main influencing factor for the thickness of the steel barrel barrels that cannot meet the thickness requirements of the process. If new techniques and new equipment are not used, this problem is not a problem. The solution has been completely resolved.
Grinding easily causes the drum barrel to flex
The large amount of heat generated in the edging process often causes thermal deformation of the barrel plate and deflection. Deflection caused the following problems:
Barrel board can not be repeatedly edging, due to deflection, the two sides of the board often tilt, grinding two times, the tilt of the corner often let the grinding wheel to become a missing corner.
The bent barrel body is rolled round. After being welded into a barrel, the shape of the barrel is not sufficient for roundness, and the phenomenon of "big belly" often appears. Of course, this phenomenon also has a great relationship with welding deformation.
Ways and Suggestions for Solving Quality Problems
Barrel edging process is a relatively backward process method in the barrel making process. In order to fundamentally solve the quality problem of this process, the process method and production equipment should be started. At present, there are many more advanced methods at home and abroad. Such as welding seam edge milling machine and milling edge milling machine, if you do not use new equipment, new technology, continue to follow this backward edging process, then the quality of edging will be difficult to solve.
In addition to failing to meet product quality requirements, the old edging process has many shortcomings. To sum up, there are mainly the following:
The production environment is extremely harsh. The dust formed by the grinding wheel powder and iron has made the smoke in the workshop turbulent. In addition, it has a strong and harsh noise, which has seriously polluted the environment and affected the physical and mental health of employees.
The wear of the grinding wheel is very fast, and wear in the production and wear of the dressing of the grinding wheel all result in greater consumption of the grinding wheel and increase the production cost.
The manual operation of the grinding wheel makes it difficult to stabilize the quality of the process and it is impossible to implement automatic production.
From the above analysis, it can be seen that the reason why the thickness of the barrel plate cannot meet the process requirements is mainly due to the backward process methods and equipment. To change this situation and improve product quality, new process methods and advanced equipment must be adopted.