TH44470B - How to produce cans, bottle shapes, and crafting tools. - Google Patents

Abstract

DC60 (29/02/55) Method for manufacturing bottle-shaped cans for creating a combined sloping section with a small diameter neck by subsequently working on the bottom section of the cylindrical can, which is made with its body wall thinner than its bottom wall. This is done by drawing a metal sheet with a thickness of 0.1 to 0.4 mm by performing at least one thinning, bending/stretching, and rolling operation. This method consists of: the first stage of creating the bottom corner section of the can as a curved sloping surface with a curved longitudinal section; the stage of creating the first small-diameter cylinder section of the bottom drawing of the can into a cylindrical bottom shape with a smaller diameter than the body of the can, with the curved sloping surface of the bottom corner section being smoothed; the stage of creating the second small-diameter cylinder section of the bottom drawing of the can bottom into a smaller diameter bottom shape, with the bottom corner section being smoothed by the surface of the fitting; and the stage of re-creating the sloping section of the pushing and expanding sloping section, which is created by the first small-diameter cylinder section creation stage and the second small-diameter cylinder section creation stage. A second small-diameter cylindrical section is created as a flat, sloping section leading to a curved downward sloping surface on the can body, after the diameter of the bottom cylindrical section has been created by the pulling work of the second small-diameter cylindrical section creation step, one or two or more times, to bring it almost equal to the diameter of the neck section. A method for fabricating bottle-shaped cans with a sloping downward section and a small-diameter neck to be created from a hollow cylinder or D&I can body with a body wall thinner than the bottom end wall, which is produced from sheet metal with a thickness of 0.1 to 0.4 mm, by at least one thinning step of stretching and rolling. The described method of this invention comprises the steps of pre-fabrication of the bottom of the can body into a curved downward sloping section with a curved longitudinal section; a step of the first pull to create a first small-diameter cylindrical section where the diameter is reduced; one or more steps of the second pull to create the first cylindrical section into a second cylindrical section with a reduced diameter; and a reshaping step to reshape the sloping downward section into a flat, sloping surface in the section of the curved downward sloping of the can body.

Claims (14)

1. The method for manufacturing bottle-shaped metal cans with a sloping bottom and a hollow cylindrical neck, both protruding from the cylindrical body wall, is constructed from a hollow cylinder with a lower end wall that is thinner than the lower end wall. This hollow cylinder is formed by a known method of using thin sheet metal (0.1 to 0.4 mm) through drawing and subsequent thinning by at least one stretching and rolling process. The method consists of: a pre-forming step of the hollow cylinder where its bottom edge defines the lower end wall into a sloping curved section; a drawing step to push the lower end wall while preventing the sloping curve from wrinkling by a pusher whose outer end is shaped to fit the sloping curve and prevent wrinkling; a drawing die where the sloping end is shaped to fit the sloping curve; and a drawing punch to create the first hollow cylindrical protrusion with the lower end wall where the hollow cylindrical protrusion... The first protruding section extends from the curved downward slope and has a diameter of the hollow cylinder. One or more steps of the second pulling process are used to push the end wall of the first hollow cylinder protruding section while protecting the edge defining the end wall of the first hollow cylinder protruding section from wrinkling. This is done by a section of the pusher with an outer tapered end that is tapered at the surface to the curved downward slope adjacent to the first hollow cylinder protruding section to prevent wrinkling at the edge defining the end wall of the first hollow cylinder protruding section. A new pulling die has at least one taper at the surface that meets the tapered end of the pusher, where the alignment of the new pulling die is tapered to contact the curved longitudinal section of the curved downward slope, and the new pulling punch creates the final hollow cylinder protruding section with an end wall, protruding from the curved downward slope and having a cylindrical diameter smaller than the diameter of the first hollow cylinder protruding section. And equal to the diameter of the hollow cylindrical neck, and the reshaping process to push, stretch and smooth the transition surfaces that occur by the first and second pulls on the edges of the sloping, curved and protruding sections. 2. The method for manufacturing bottle-shaped metal cans according to claim 1 is such that a step or multiple steps of the second drawing consist of re-drawing of the first hollow cylinder protrusion while protecting the defined edge of the total end wall of the first hollow cylinder protrusion from wrinkling by a section of the pusher with an outer tapered end that is tapered at the surface to the longitudinal section close to the longitudinal protrusion of the curved slope to prevent wrinkling in the defined edge of the total end wall of the first hollow cylinder protrusion, a re-drawing die with at least a taper at the surface that contacts the tapered end of the pusher, where the taper of the re-drawing die is tapered to contact the longitudinal protrusion of the curved slope, the outer diameter of the tapered end of the pusher, the taper of the re-drawing die extends radially and down beyond the outer perimeter of the taper of the pusher, and the re-drawing and re-drawing continue until the line between the curved slope and the first hollow cylinder protrusion and The adjacent sections of the sloping downward section are pulled into the gap between them and are brought into contact with the tapered ends of the pusher and the new drawing die. 3. The method for manufacturing bottle-shaped metal cans according to claim 2 is such that the reshaping process is performed on all surfaces extending from the sloping curve to the hollow cylindrical overhang, finally to create a tapered curved surface of the longitudinal curve in the overhang of the sloping curve by stretching, pushing, and extending the entire surface by a pair of forming tools, each with a surface having a curved appearance that matches the longitudinal curve overhang of the sloping curve. 4. The method for manufacturing bottle-shaped metal cans according to claim 1 is such that a step or multiple steps of the second drawing process consists of re-drawing of the first hollow cylindrical protrusion from which it is wrinkled by a section of the pusher with an externally tapered end that is tapered at the surface to a straight longitudinal section tangent near the longitudinal protrusion of the curved slope to prevent wrinkling. At the defined edge of the total end wall of the first hollow cylindrical protrusion, the re-drawing die is tapered to tangent to the longitudinal protrusion of the curved slope; the total end of the rounded section of the re-drawing die is greater than the external diameter of the tapered end of the pusher and the re-drawing die; and the re-drawing continues until the line between the curved slope and the first hollow cylindrical protrusion and the adjacent section of the tapered end of the pusher and the tapered section of the re-drawing die meet. 5. The method for manufacturing bottle-shaped metal cans according to claim 4 is such that the second drawing step is supplemented by individual pusher sections, a new drawing die and a new drawing stamping die with joint tapered ends, tapered sections and rounded sections, respectively. 6. The method for manufacturing bottle-shaped metal cans according to claim 4 is such that the reshaping step is performed on all surfaces extending from the sloping curve to the first hollow cylindrical protrusion to create a smooth surface of the longitudinal sloping appearance in the protrusion of the sloping curve. By clamping between a pair of forming tools with the longitudinal curved surface of the sloping curve, a re-drawing hammer is inserted into the final hollow cylindrical protrusion to draw and stretch the entire surface to the final hollow cylindrical protrusion. 7. The method for manufacturing bottle-shaped metal cans according to claim 1 is one in which the process of pre-forming a hollow cylinder at the bottom edge defines the bottom end wall, which then merges into a sloping, curved longitudinal section. 8. The method for manufacturing bottle-shaped metal cans according to claim 1 is a hollow cylinder with a lower end wall that is thinner than the lower end wall. This is created in the final step by using a punch with a leading end that is shaped around a curved longitudinal section to pre-create a hollow cylinder with a lower edge that defines the lower end wall, which is a sloping curve of the longitudinal section. 9. The method for manufacturing the rectangular, bottle-shaped metal cans according to claim 1 is one in which a thin metal sheet consisting of aluminum sheets is coated with a thermoplastic ravin film. 10. The method for manufacturing bottle-shaped metal cans according to claim 1 is one in which a thin metal sheet composed of a surface-treated steel sheet is coated with a film of thermoplastic resin. 11. The method for manufacturing bottle-shaped metal cans according to claim 1 is such that the section of the cylindrical wall of the hollow cylinder attached to the bottom end wall is thin, but not thinner than 60% of the thickness of the thin metal sheet. 12. The forming tools used for producing bottle-shaped metal cans are constructed from cylindrical bottle-shaped cans made of sheet metal, with a bottom section formed into a curved, sloping surface. The bottom of the can is integrated with the sloping section and the small-diameter cylindrical neck. Specifically, a drawing die has an inner surface shape of its leading end identical to the curved, sloping outer surface of the sloping section, and is adjusted to contact the outer surface of the sloping section. A drawing punch pushes the end of the can closer to the center than to the bottom corner, which is clamped by the drawing die. A first non-wrinkle pusher, from the inner to the outer surface, forms the small-diameter bottom cylinder. A second smooth pusher has a tapered surface at the leading end of the straight longitudinal section that forms a tangent to the curved, sloping surface of the previously formed sloping section. A new drawing die has a tapered surface of the straight longitudinal section that forms a tangent to the curved longitudinal section of the curved, sloping surface of the sloping section at one point to face each other. The tapered surface of the second smooth surface pusher, when the outer diameter is larger than that of the tapered surface of the second smooth surface pusher, the new drawing die for creating the end cylinder section in the smaller diameter cylinder section by pushing the end cylinder section from the inside to the outside in an axial direction against the angled section of the bottom of the can, which has a smooth surface by the second smooth surface pusher and the new drawing die, which is characterized by such a forming tool consisting of a pusher, die, and stamper, where the pusher and die have a surface shape at the leading end that corresponds to the final shape of the smooth leading downward slope to the curved downward slope. 13. The constructing instrument under claim 12 is also characterized by the fact that the pusher and the mold, when combined, form the new constructing instrument, have a curved longitudinal section at the leading end, respectively. 14. The forming tool under claim 12 is also characterized as follows: the second smooth pusher has a tapered straight longitudinal section at its leading end which is placed tangent to the curved longitudinal section of the curved inclined surface; the re-drawing die has a tapered straight longitudinal section which is placed tangent to the curved longitudinal section of the curved inclined surface, one part of which faces at least the said tapered section of the second smooth pusher, and has a convex curved section on its part on the leading end side of the tapered section; and the said pusher and the die which make up the re-drawing tool have a straight longitudinal tapered section at its leading end.