Method for producing a sterilizable strainer dish having a three-dimensionally structured bottom
A method for producing a strainer dish for receiving medical objects to be disinfected or sterilized. A base surface is produced from a sheet metal blank in a first machining step. In a second machining step, the sheet metal blank or base surface is provided with holes to obtain a perforated starting shape. In a third machining step which takes place after the first and second machining steps, a perforated plane is produced, which can be divided into a flat inner section and an edge section. In a fourth machining step which takes place after the third machining step, a strainer dish shape is produced. The raw bottom corresponds to the flat inner section of the perforated plane. A fifth machining step, which takes place after the third machining step, at least partially produces a three-dimensionally structured bottom from the flat inner section.
1. A method for producing a sieve basket for receiving medical items to be disinfected or sterilized, the method comprising the steps of:
in a first processing step, producing a base plate or sieve basket base surface comprising a bottom and side walls of the sieve basket in one piece;
in a second processing step taking place prior to or after the first processing step, providing the base plate or the sieve basket base surface with apertures or holes in order to obtain a perforated initial shape;
in a third processing step taking place after the first and second processing steps, flattening the base plate or sieve basket base surface to remove warping caused by internal stresses that develop after the first processing step and/or the second processing step, producing a perforated or punched plane that is divided into a flat inner portion and edge portions;
in a fourth processing step taking place after the third processing step, producing a sieve basket shape with a raw bottom and side walls extending vertically thereto, the raw bottom corresponding to the flat inner portion and the side walls corresponding to the flat edge portions of the perforated or punched plane; and
in a fifth processing step, which takes place directly or indirectly after the third processing step, embossing the flat inner portion with at least one embossing punch, pressing the at least one embossing punch by a press onto the flat inner portion in such a way that the flat inner portion plastically adapts to the negative shape of the at least one embossing punch so that an entirety of the flat inner portion forms a three-dimensionally structured bottom.
2. The method according to claim 1 , wherein the fifth processing step takes place prior to the fourth processing step.
3. The method according to claim 1 , wherein the first, second, third, fourth and fifth processing steps are done in chronological order.
4. The method according to claim 1 , wherein, after the fourth processing step, a sixth processing step takes place, which connects the edge portions together, which now constitute the side walls of the sieve basket.
5. The method according to claim 1 , wherein the apertures obtained in the second processing step cause perforations which are structured differently from each other in the flat inner portion and the edge portions.
6. The method according to claim 1 , wherein the at least one embossing punch comprises a plurality of punches, and wherein the plurality of punches is used so that the flat inner portion comprises the three-dimensionally structured bottom.
7. The method according to claim 6 , wherein the at least one embossing punch is designed in such a way that the three-dimensionally structured bottom has corrugations or indentations which project towards a sieve basket interior and/or towards a sieve basket exterior, so that the three-dimensionally structured bottom has a surface comprising a meshwork.
8. The method according to claim 6 , wherein the at least one embossing punch is designed in such a way that the three-dimensionally structured bottom comprises a plurality of longitudinal strut pairs and a plurality of transverse strut pairs that run perpendicular to the plurality of longitudinal strut pairs in a top view of the three-dimensionally structured bottom.
9. The method according to claim 6 , wherein the at least one embossing punch is designed in such a way that the three-dimensionally structured bottom forms contact and fixing surfaces for items to be inserted into the sieve basket.
10. The method according to claim 1 , wherein the first processing step comprises a cutting step.
11. The method according to claim 1 , wherein the second processing step comprises a punching step.
12. The method according to claim 1 , wherein the third processing step comprises a rolling step to remove said warping caused by internal stresses that develop after the first processing step and/or the second processing step.
13. The method according to claim 1 , wherein the fourth processing step comprises a bending step.
14. The method according to claim 1 , wherein the three-dimensionally structured bottom consists of a plurality of longitudinal struts and a plurality of transverse struts that intersect the plurality of longitudinal struts in nodes, forming alternating wave crests and wave troughs, wherein the wave crests are arranged in a first plane and the wave troughs are arranged in a second plane parallel to and offset from the first plane.
15. A method for producing a sieve basket for receiving medical items to be disinfected or sterilized, the method comprising the steps of:
producing a base plate from a sheet metal blank, the base plate comprising an inner portion and edge portions;
forming apertures in the inner portion to create a plurality of struts;
processing the base plate to remove warping caused by internal stresses that develop after the step of producing the base plate and/or the step of forming apertures, so that the inner portion and edge portions are flat and conform to a single plane;
bending or deforming the edge portions relative to the inner portion to form a sieve basket shape having a bottom and sidewalls; and
pressing at least one embossing punch onto the inner portion, after the step of processing the base plate to remove warping, to plastically deform the plurality of struts so that each strut assumes a uniform wave shape.
16. The method according to claim 15 , wherein the plurality of struts form a plurality of nodes.
17. The method according to claim 16 , wherein the plurality of struts further comprise a plurality of longitudinal struts and a plurality of transverse struts that intersect the plurality of longitudinal struts at the nodes.
18. The method according to claim 17 , wherein the plurality of longitudinal struts are perpendicular to the plurality of transverse struts.
19. The method according to claim 16 , wherein the step of pressing at least one embossing punch onto the inner portion to plastically deform the plurality of struts comprises plastically deforming each strut so that a first subset of the plurality of nodes form wave crests and a second subset of the plurality of nodes form wave troughs.
20. The method according to claim 15 , wherein the uniform wave shape is a trapezoidal shape.
21. The method according to claim 15 , wherein the steps are performed in chronological order.