| Claims 1. A method for stamping shaped elements of metal sheeting by placing sheet in a die and acting upon the sheet with a stencil and a punch, characterized in that the metal sheet (12) is placed on a rotating stencil (I), with a shaped frontal surface, and pressed with a blank holder (2) with a shaped frontal surface with an outline corresponding to the outline of the frontal surface of the stencil (1) for shaping the outline of the bottom, and to the top edge of the rotating stencil (1) from the side of the punch (2) at least one shaping roller (9) is pressed, which moves with a continuous and/or oscillatory movement along the edge of the metal sheet (12), at a distance from the external surface of the stencil (1) determined by the thickness of the sheet (12). 2. A unit for rotation shaping of metal sheet elements, which has a stencil and a blank holder, whereas the stencil is located on a rotating spindle, placed in a head-stock placed on a body, on the cradle of which a rotating and sliding tailstock is placed with a blank holder, characterized in that the frontal surfaces of the stencil (I) and the blank holder (2) are shaped to fit each other, moreover at least on one side of the body (5) a support (8) is mounted, on which a shaping roller (9) with a pressure and control mechanism (10) is located. |
The subject of the invention is a method for stamping of shaped elements of metal sheet and a unit for stamping of shaped elements of metal sheet, which is used for the stamping of metal sheet elements in the process of construction of products made by spinning.
In known solutions products made by spinning are usually shaped on machine tools, where a circle of metal sheeting is placed on a stencil and held with a blank holder, and then the external surface is shaped using the force of a roller moving over the external surface.
In such an operation there is no possibility of shaping the surface of the bottom of the product. This product has then be additionally placed in another machine tool, which has the option of shaping the bottom of the product.
This is a solution that requires time and energy.
The solution presented below eliminates these inconveniences
The essence of the invention, which a method for stamping shaped elements of metal sheeting by placing sheet in a die and acting upon the sheet with a stencil, consists of the metal sheet being placed in a rotating stencil, with a shaped frontal surface, and pressed with a blank holder with a shaped frontal surface, with an outline corresponding to the outline of the frontal surface of the stencil for shaping the outline of the bottom, and to the top edge of the rotating stencil from the side of the punch at least one shaping roller is pressed, which moves with a continuous and/or oscillatory movement along the edge of the metal sheet, at a distance from the external surface of the stencil determined by the thickness of the sheet. .
This method is implemented by a unit for rotation shaping of metal sheet elements, which has a stencil and a blank holder, whereas the stencil is located on a spindle, placed in a head-stock placed on a body, on the cradle of which a rotating and sliding tailstock is placed with a blank holder, the essence of which consists of the frontal surfaces of the stencil and the blank holder are shaped to fit each other, moreover at least on one side of the body a support is mounted, on which a shaping roll with a pressure and control mechanism is located.
The use of the solution presented in the invention unexpectedly enabled the following technical and utility effects:
- ability to conduct on one machine of stamping, calibrating, restnking, lengthening and projecting rotational crushing, hemming of sheet and pipe products and trimming,
- ability to perform two procedures on one machine in one process step, that is an extrusion and spinning of a product,
- ability to shape and spin of shaped sheet with a thickness up to 2 mm,
- ability to perform the procedure of initial stamping and calibrating of cylindrical products after spinning or rotational crushing and restriking of other complex shapes,
- ability to create products in an arbitrary, complex shape in one operation,
- ability to adapt already existing units to the use of the solution presented in the invention,
- ability to control the movement of the pressure roller through a CNC controller,
- ability to repeat the process one or multiple times by another pass of the pressing roller,
- ability to exert roller pressure by a continuous or oscillatory movement, depending on the sheet parameters,
- ability to shape the metal sheet by two rollers, placed on opposite supports,
- ability to shape the edge of the product on a supporting roller,
- low costs of construction. The method of implementation of the solution was presented in the example implementation below, where in order to better illustrate the invention on a schematic diagram an example unit was shown, where on fig. 1 the unit was shown in a view on the vertical plane, on fig. 2 this unit was shown in a view on the horizontal plane, on fig. 3 the element with shaping roller was show in a version with flat pressure surfaces of the stencil and the blank holder, and on fig. 4 the element with shaping roller was shown in a version with shaped pressure surfaces of the stencil and the blank holder.
A unit for rotational shaping of metal sheet elements, has a stencil 1 and blank holder 2. Stencil 1 is placed on a rotating spindle 3, placed in a head-stock 4 placed on the body 5, on the cradles 6 of which on the opposite side of the spindle a rotating and sliding tailstock 7 is placed. In the grips of the tailstock 7 the blank holder 2 is placed. At least on one side of the body 5 a support 8 is located, on which a shaping roll 9 is mounted, with a pressure and control mechanism 10. The stencil 1 has a shaped frontal surface, and the blank holder 2 has a shaped frontal surface with an outline corresponding to the outline of the frontal surface of the stencil 1 for shaping the outline of the bottom.
The method for stamping shaped elements of metal sheet 12 in a unit presented below is that the metal sheet 12 is placed on a rotating stencil _L and then pressed using a rotating blank holder 2 to place the sheet 12 on the stencil 1, shaping the outline of the bottom of the product, and then to the upper edge of the rotating stencil 1 from the side of the blank holder 2 at least one shaping roller 9 is pushed, which moves with a continuous and/or oscillatory movement along the surface of the metal sheet 12 at a distance from the external surface of the stencil i which depends on the thickness of the metal sheet 12.
There are versions, where in the extreme zone of the metal sheet edge 12 a supporting unit 13 for the metal sheet edge 12 is located.
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