Let's talk about the 200-liter steel drum round crimping process (3)
Wu Tielin
Third, simple arc spiral round curling process analysis
The simple arc spiral round curling process is shown in Figure 9. Including pre-crimping, head roller curling, two-roller crimping, and extrusion-finishing four-prong process.
Figure 9
Pre-curling. The beading process is a process of separately processing the bottom cover (without a barrel). This process is the simplest and the easiest to implement, but it is very effective and determines the quality of the rounded edge of the steel drum. The pre-rolling is formed at the edge of the circumference of the bottom cover of the bucket to form a pre-rolling groove. In the pre-rolling process, the filler is injected, and the filler is uniformly kneaded to the edge by centrifugal force. After drying, a sealing ring is formed on the edge of the pre-rolling groove, and the sealing effect is optimal. Through analysis, we know that the pre-curling part is the innermost layer of the round curl, which is equivalent to the initial section of the plane curl, which is the base circle of the relatively flat curl (fetal). The curvature of the outer layer of the round curl is attached to the curvature of the pre-roll. In theory, the greater the curvature of the pre-bead, the better. From practical considerations, there should be enough packing clearance in the steel barrel bead. Ideally, the maximum outer diameter of the pre-rolling groove should be about 5 mm. If the pre-roll is omitted, the arc curl with a maximum outer diameter of about 5 mm is only completed by the free curling section, which is not easy to do. Prerolling must be done separately with a roller with the largest curvature.
The pre-hem is the first rewinding edge, completing the I zone of the entire rounded edge. Pre-rolled roller curve design, see Figure 9ao
1 The center coordinates of the prerolled roller curve. The simple circular spiral has two centers, O1O2 (A, B), O1O2 = plate thickness δ = 1.25mm
Relative K point K (x=-1.25, y=-2.5)
O1 (x1=0, y1=0)
O2 (x2=-1.25, y2=0)
2 roller arc radius
R1=1.5δ-1.5×l.25=1.870mm, O1 is the center of the circle, the first quadrant.
R2 = 2.5 δ = 3.125 mm, O2 is the center of the circle, the fourth quadrant.
3 pre-rolled iron plate center line expansion length
R2 part = 2Ï€R1' / 4 = 1.96 39mm
R2 part = 2Ï€R2' / 4 = 3.9269mm
The entire deployment length = 5.8908mm
The sheet is curled and deformed, one side is stretched, and the other side is compressed to make the sheet thickness uneven.
The effective travel of the 4 drive cam is also 5.8908mm. After a closely designed cam curve, the cam's transmission effect is better than that of the hydraulic transmission. But pay attention to the changes in the roller curve and cam curve due to wear.
5 The guiding slope of the roller. The slope of the guide rail of the roller affects the deformation of the bottom edge of the bucket after entering the roller. The K point is the starting point of the deformation. The guiding slope of each roller of the multiple crimping should be consistent, so that the rewinding edges are well connected. Generally 2 ° ~ 8 °.
2. The first side of the roll is also the second heavy side, completing the entire area of ​​the rounded area II. The head roller design is shown in Figure 9b.
The center coordinates of the 1 wheel curve. The center of the roller of the head roller is O3O4, O3O4 = δ = 1.25mm
O3 (X3=0, y3=δ=1.25mm)
O4 (X4=-1.25, y4=1.25mm)
2 Roller curve arc radius.
R3=R2=3.125mm, O3 is the first quadrant of the center
R4=3.5δ=4.375mm, O4 is the center of the circle, the fourth quadrant.
3 head rolled edge iron plate expansion length.
R3 part = 2Ï€R3' / 4 = 3.9269mm
R4 part = 2Ï€R4'/4= 5.8304mm
Overall deployment length = 9.8173 mm
The effective stroke of the 4 drive cam is also 9.81.73mm
3. The second curling edge is also the third heavy crimping edge, which completes the entire round-edged summer zone and has the function of extrusion and shaping.
The design of the two roller arcs is shown in Figure 9c.
1 center coordinate of the arc of the two roller
The center of the two roller curves is O5O6, O5O6=1.25mm
O5 (X5=0, y5=2δ=2.5mm)
O6 (X6=-1.25, y6=2.5mm)
2 arc radius of the roller curve
R5=3.5δ=4.375mm, O5 is the center of the circle, the first quadrant
R6=4.5δ=5.625mm, O6 is the center of the circle, the fourth quadrant
3 iron plate center line expansion length
R5 part = 2π × 3δ / 4 = 5.8904mm
R6 part = 2π × 4δ / 4 = 7.7444mm
The entire unfolded length = 13.6348mm
The cam feed effective stroke is also 13.6348mm
4. The total unfolding length of the pre-hem, the first bead, and the two bead:
S=5.8904+9.8173+13.6348=29.3425mm
5. The role of extrusion shaping. Extrusion shaping plays an important role in the sealing performance and strength of steel drums. There are three types of extrusion: flat extrusion, upper extrusion, and shape extrusion.
1 flat extrusion. After the original two-side crimping roller is used, the curling shape is completed and the feeding is continued for a short distance. Generally, a plate thickness of 1 is effectively determined by the effective stroke of the cam, plus 1.25mm, and the steel drum is rotated 1-2 turns (the steel drum cam has another monograph). After extrusion, the original curling shape is basically not changed, and the purpose is to eliminate the gap of the coil layer, prevent the solid bullet, and make the curled edge firm. Figure 9d is a simple circular spiral with seven layers of rounded edges pressed against a plate thickness.
2 squeezed on. The upper extrusion uses a special extrusion roller. The guiding slope should be the same as the guiding slope of each reeling roller. The shape of the lower curve of the roller is the same as that of the two rollers, and the curvature of the upper portion becomes smaller, leaving a squeeze gap. As a result of the extrusion, the radial dimension of the round bead is reduced, the axial dimension is increased, and the wound layer fills the gap and flows in the direction of the arrow. The purpose of the upper extrusion is still to increase the fastness of the round curl and obtain a certain shape of the curl, as shown in Figure 9e.
3 deformation extrusion. A specially shaped roller is used. The purpose is to completely destroy the original curl shape, to maintain technical confidentiality, and to establish the patented products of the company, such as the trapezoidal curl of GERMAN, INSTITUTE摹TRAPEZSEAM in the article “Process Anatomyâ€.
4 Through the study of extrusion deformation, we have entered a new realm. Learning the round crimping technique, it is not possible to study the outer shape of the rounded edge separately. The outer shape of the plasticine is printed, the cross-section of the brand-name product is sawed, and the round-edged map is collected. It can only be used for analysis and reference. Due to the different nature of the production process, don't be superstitious about foreign countries, don't be superstitious. We must understand the basic principles of the hemming process, find out the basis of each heavy roller curve, and combine the reality of the factory to move from the inevitable kingdom to the free kingdom.
6. Analysis of the process of simple circular spiral spiral crimping process
1 The guiding slopes of the curling curves of the respective heavy rollers are equal, which solves the problem of the connection of the arcs of each rewinding edge.
2 The simple circular spiral has only two centers, but for each reel, the center of the circle is shifted by one plate thickness relative to the starting point K of the arc. This is because of the simple circular spiral, it is impossible to complete a process and must be processed in sections.
3 gives the arc radius of each section of I, II, and III, which is equal to the arc curve of each reeling roller. The length of the center line of each segment is obtained, which is equivalent to the effective feed stroke of the cams of each rewinding edge.
4 Calculate the total unfolding length, which is convenient for the design of the blanking size of the bottom cover of the bucket, which is convenient for adopting reasonable blanking size and advanced stamping process.
5 simple circular spiral, the circular arc change twice per week approximates the concept of the spiral, which is of great significance in theory. However, there is still a certain gap from the ideal effect. The arc radius changes three times per week, four times... Unlimited, close to ideal. Usually, the arc changes four times a week, which has high practical value.
8 This paper introduces the thick round edge curling process of the bottom cover and the barrel plate, and can also deduct the unequal thickness curling process of the bottom cover and the barrel plate.
Steel drum manufacturing technology is constantly improving and constantly improving. we are at. Simple arc spiral round crimping process. On the basis of the research, the "four-fold circular spiral spiral crimping process" was researched, so that the 200-liter steel drum round curling process was scientific and standardized. Therefore, the development of thinning steel drums is promoted to achieve the most economical use, the best quality and the highest efficiency, which makes the steel barrel industry have new prosperity.
(End of the article)
The product Free Sample Custom design compression high quality nylon Ankle Guard
manufactured by SNSD improves blood circulation for fast recovery
minimizes injury, offers optimal muscle support between workouts and during casual everyday activities
Eliminates bad odors & High absorption capacity
Designed to Increase your performance while ensuring you`re a step ahead in injury prevention!
Material:Nylon
Color Any color you want
Size Any sizes you needed
Sample available
Loading port Shanghai or Ningbo
Usage and Function:
1)It is in the nature of commanding.
2)Easily & quick to use and is ametabolic.
3)Be reusable for many times.
4)The best one of waist support to keep warm.
Ankle Protector,Ankle Pads,Ankle Guard,Black Ankle Guards
Yangzhou Sainuo Star Sports Products Co., Ltd. , https://www.cnsportsgoods.com