Method for controlling an injection process in an open-loop or closed-loop manner

摘要

A method for controlling an injection process in an open-loop or closed-loop manner in the production of a molded part injects melt mass by at least one injection unit into at least one cavity enclosed by a tool by means of at least one nozzle. The at least one cavity has at least one measuring location, which is coupled to a binary detector, which can change from a first defined state to a second defined state. The binary detector changes the state thereof at the time at which the melt mass arrives at the measuring location. On the basis of the state change of the binary detector, an open-loop or closed-loop control unit controls the injection velocity V of the at least one injection unit in an open-loop or closed-loop manner, the temperature T of the melt mass before the injection, the termination of the injection at the at least one nozzle, and/or the starting of a subsequent process.

主权项

1. A method for controlling an injection process in an open-loop or closed-loop manner during the production of a moulding, wherein melt mass is injected by at least one injection unit into at least one cavity enclosed by a tool by means of at least one nozzle, wherein the at least one cavity comprises at least one measuring point which is coupled to a binary detector, which can only assume two output states, which can change from a first defined output state at an initial sensed condition of a parameter of the injection process into a second defined output state in response to a change of the initial sensed condition of the parameter of the injection process, wherein the binary detector does not form an edge of the cavity wall, wherein when the binary detector is in either the first output state or the second output state, the method comprising the following steps:
sensing an initial sensed condition at the measuring point before the melt mass is injected and when the binary detector is in a first one of its two output states, when at the time t, which denotes the moment when the melt mass arrives at the measuring point, the binary detector senses a change in the initial sensed condition, wherein when the binary detector senses a change in the initial sensed condition then without first converting that sensed change in the initial sensed condition into a numerical representation of the parameter of the injection process, the output state of the binary detector changes to the second one of its two output states at the time t, wherein this change in the output state of the binary detector at the time t occurs without rendering a particular numerical quantification of the magnitude of the melt temperature, a particular numerical quantification of the magnitude of the tool temperature, a particular numerical quantification concerning the geometry of the cavity in the region of the measuring point and without a particular numerical quantification concerning the transparency of the melt, and without setting of any predetermined trigger values in the binary detector and without performing any interpretation of numerically quantified measurements of the binary detector, wherein the change in the output state of the binary detector is transmitted by an unprocessed electric signal via an insulated copper line that extends from the binary detector to an open-loop or closed-loop control unit, and wherein solely based on the change of output state of the binary detector, the open-loop or closed-loop control unit controls in an open loop manner or in a closed loop manner a parameter of the process selected from the following process parameters: the injection velocity V of the at least one injection unit, the temperature T of the melt mass before the injection, the termination of the injection on the at least one nozzle and the starting of a subsequent process.