Patent CZ-297799-B6 (CZ)
Title: Process of and apparatus for preparing walls of a casting or forming mold, spray element and use thereof
Inventor: RENKL HANS-DIETER
IPC: B05B15/68
Filed: 1998-09-21
Abstract: In the present invention, there is disclosed a process for preparing the mold walls (12a, 12b) of a mold (12) for the molding or shaping of a molded part after completion of a molding cycle and the removal of the molded part from the mold (12) to make the walls ready for the next molding cycle, wherein the process comprises the following steps: a) the mold walls (12a, 12b) are brought to the desired temperature; and b) a mold wall treatment agent is applied to the mold walls (12a, 12b). The invention is characterized in that steps a) and b) are carried out in the sequence indicated and independently of each other, where, in step a), the supply of heat to, or the removal of heat from, the mold walls (12a, 12b) is carried out in a controlled manner (20a), particularly in a program-controlled manner, as a function of the process conditions and/or the environmental conditions; and in that in step b), the mold wall treatment agent is applied in a controlled manner, particularly in a program-controlled manner. The ready-to-use mold (12) wall (12a, 12b) treatment agent contains at least 98 percent by weight of a substance exhibiting lubricating and release properties and no more than 2 percent by weight auxiliary materials such as bactericides, emulsifiers, and solvents such as water. Said mold (12) wall (12a, 12b) treatment agent is applied to the mold (12) walls (12a, 12b) by means of at least one spray element (26) with centrifugal atomization and air guidance. There is also disclosed a device (10) for preparing the walls (12a, 12b) of a mold (12) being characterized in that it comprises a control device (20) with a tempering controller (20a) and a mold (12) wall (12a, 12b) treatment controller (20b), wherein the tempering controller (20a) and the mold (12) wall treatment (12a, 12b) controller (20b) are designed and coordinated with each other in such a way that, before the mold (12) wall (12a, 12b) treatment agent is applied to the mold (12) walls (12a, 12b), the mold (12) walls (12a, 12b) are first tempered to a desired temperature, and wherein the tempering controller (20a) controls the supply of heat to or the removal of heat from the mold (12) walls (12a, 12b) as a function of the process conditions and/or the ambient conditions. Disclosed is also a spray element (26, 26', 26'') comprising a rotor (110), which is mounted with freedom to rotate around a axis of rotation (R) in a spray element body (116, 116', 116''), wherein an atomizing element (114, 114', 114'') is attached to one end of the spray element (26, 26', 26'') in the longitudinal direction thereof. Said spray element (26, 26', 26'') further comprises a feed line (124) for the mold (12) wall (12a, 12b) treatment agent, from which the mold (12) wall (12a, 12b) treatment agent arrives at the atomizing element (114, 114', 114''), and a feed line (128) for control air, which serves to direct the mold (12) wall (12a, 12b) treatment agent atomized by the atomizing element (114, 114', 114'') toward the mold (12) walls (12a, 12b) to be sprayed wherein an outlet (130b) of the control air feed line (128) is located in close proximity of the outside circumference of the atomizing element (114, 114', 114'').