Improvement of steel barrel arc curling
Improvement of steel barrel arc curling
Shanghai Xugong Coating Technology Co., Ltd. Xu Guoxing
The steel drum is formed by winding a disc-shaped top and bottom at both ends of the circular barrel. The roll of the barrel and the top and the bottom are formed by forming flanges at the two ends of the barrel and the peripheral portions of the top and the bottom, respectively, and then the two flanges are overlapped, and the crimping seam is formed by multiple crimping.
The structure of the seam of the steel barrel and the degree of sealing determine the quality of the barrel. Since the seamed joint portion is at both ends of the barrel and protrudes outward, the steel barrel is likely to collide and become deformed, loosened, cracked, etc. during erection, falling or moving, and during transportation. And there is a deflation. In order to prevent this problem, various steel drum industries in various countries have proposed a variety of new structures for seaming joints, new cross-sectional shapes for seamed joints, new methods for seaming seams, and new seaming joints. All methods or devices that solve the problem have the same goal of increasing the strength and sealing performance of the seamed portion and increasing the force of distracting the external force. In fact, the structure, method and crimping device of the steel drum bead are similar, and the key problem is the shape of the seam of the steel drum and the tightness between the seam and the layer.
The conventional conventional rectangular crimped steel drum has a poor drop resistance, however, since the curled rectangular shape is formed by strong pressing, the degree of tightness between the layers is relatively high. Therefore, the rectangular crimped steel drum has a good sealing performance without being subjected to strong external forces such as collision and dropping.
In order to increase the strength of the seam portion and the strength of dispersing the external force, the cross-sectional shape of the seam portion of the steel drum may be made circular. Thus, a large moment of inertia is generated in the radial direction, so that a large strength can be obtained in the radial direction, and the impact energy can be more effectively dispersed.
However, there is a problem here that the tightness between the body of the seamed seam and the flange layer of the top and bottom is maintained by merely "rolling in", so the between the layer of the steel barrel and the layer The tightness is not enough, and a relatively large gap is formed in the center of the seaming portion, which weakens its strength and the leakage probability of the arc-rolled steel drum without external force. It is taller than a rectangular rolled steel drum. Although the corresponding filler can be filled to ensure its tightness, it does not compensate for the drop in strength caused by the void.
Alternatively, the cross-sectional shape of the seam portion of the steel drum is formed into an elliptical shape having a small radius of curvature. In this way, on the one hand, due to the partial or circular shape of the top of the seamed seam portion, the advantage of the partial round seam is maintained, and on the other hand, the work radius is caused by the small radius of curvature, thereby improving the top portion. strength. Moreover, due to the small radius of curvature, the tightness between the seamed layer and the layer is also improved, thereby enhancing the degree of sealing. However, if an elliptical shape is to be formed, a strong pressure is inevitably applied, which may cause cracks due to excessive hardening of the machining, and cracks may occur due to excessive deformation of the radius of curvature of the elliptical top portion. Is it possible to take the length of the two and make up the short difference between the two? In fact, as long as the former "circle" and the latter's "pressure" are combined, it can not only exert the strength of the "circle" and the advantages of the force dispersion, but also The use of "pressure" to reduce voids and enhance the tightness between the steel barrel crimping layer and the layer.
After the above-mentioned "circle" has been "pressed", the cross-sectional shape of the seamed portion of the steel drum should be in the shape of a sole having a half-side close to an ellipse (the cross-sectional shape of the seamed portion close to the barrel side is of course linear). The outer side of the top portion is curved outwardly toward the outer side, giving a large radius of curvature on the top surface. This produces a large moment of inertia in its radial direction, which increases the strength and better distributes the concentrated stress even if the top is impacted. The middle portion of the seamed portion is opposite to the top portion because of the concave portion formed by the strong pressing, so that the tightness between the layer and the layer of the curled edge is greatly improved. of course. It is precisely because such a sole shape is formed by applying a strong pressure to the end bending and squeezing roller, so that problems such as excessive work hardening caused by this are unavoidable. However, the key point is the strong pressing force. If the seaming part is pressed as a whole, of course, there will be cracks, which are caused by excessive work hardening external force, and most of them are located in the seaming part. The top or bottom of the barrel side. Therefore, it is most desirable to apply pressure only to the central portion of the seamed portion and to appropriately select the steel material to be used. We know that the most impacted and impacted by the external force is the top of the seamed seam. In contrast, the bottom of the seamed seam is less subject to impact and the impact is much less.
The end portion is bent and shaped by the squeezing roller, and the central portion or the bottom portion and the central portion of the seam portion of the steel drum are simultaneously strongly pressed along the radial direction of the barrel so that the top without being pressed is outward. At the same time, it also eliminates some gaps between the two flanges, so that the two flanges have a close metal contact, which improves the strength and sealing of the seamed joint. Since the remaining voids are remarkably small due to the extrusion, the sealing property of the seamed portion can be sufficiently ensured by using a small amount of the filler. Moreover, the possibility of contact of the filler with the contents of the container is greatly reduced, so that problems due to contact of the filler with the contents can be prevented or greatly reduced.
In order to form a seam of a steel drum having a cross-sectional shape of a sole having an almost elliptical shape, the pressing becomes a necessary operation. Moreover, the pressing force should be concentrated on the middle or the middle of the overhanging seam portion close to the bottom portion, so that the cross-sectional shape of the seam portion of the steel drum can be formed into an arc shape which can withstand a large external force. The middle or lower part is a waist-like layer in which the layer with a higher degree of sealing is closely attached, so that the gap between the flange of the barrel and the flange of the top and bottom disappears, forming a firmly engaging crimping joint. Seam.
In order to make the cross section of the seam of the steel drum into a sole shape with a half-elliptical shape, it is necessary to modify the squeeze roller in the steel drum crimping device. In the forming groove of the end bending shaping roller, the flange into the corner is designed to have a cross-sectional shape with a concave portion having two curved radii in a circular arc connection, when the crimping device is on the steel drum body and the top and bottom rolls At the same time, the tip end portion of the top and bottom flanges are curled along the concave curve, first passing through a concave portion having a large radius of curvature (about 2.0 to 2.5 times the thickness of the plate), and then passing through a small radius of curvature (thickness of the plate) A recess of 0.1 to 1.0 times). When passing through the second recess, the end portion is bent at an angle of about 130 degrees. Then, the end bending and squeezing roller stops. At the same time as the standby, the crimping roller starts to roll the flange portion. The forming groove of the crimping roller is designed to have a substantially spiral shape, so that the flange portions of the top and bottom are rolled by the crimping roller to form a spirally wound portion until it hits the barrel flange. At this time, the corners of the tip end portions of the top and bottom flanges are 280 degrees or more. After the spiral formation of the first week, the triple (7 layer) crimping is continued by the crimping roller. In the center of the seamed portion formed by the roll of the hemming roll, the flange of the barrel and the flange ends of the top and bottom are in an isolated state. I
There, the crimping roller stops and retreats. At the same time, the central portion or the bottom portion and the central portion of the seam portion of the steel drum are strongly squeezed by the end bending and shaping pressing roller at the same time along the radial direction of the barrel body, so that the end portion is bent and shaped into the pressing roll forming groove. The concave portion shapes the protruding portion of the curling seam portion, and the convex portion or the flat portion at the center of the end portion of the pressing roller forming groove presses the center portion and the bottom portion of the curling seam portion to be molded. At the same time, the shape of the protruding portion of the seamed portion is shaped so that the shape is a sole shape having a half-sided ellipse.
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