摘要:
In a method for thermally controlling a mold, initial measurements of flow versus pressure or pumping speed for a thermal exchange liquid are used to select an achievable flow within a maximum pressure. Subsequently, the system's identity and integrity are verified by repeating at least one measurement before and/or during a process run. An energy exchange rate can be adjusted to a moving average over preceding cycles. Thermal equilibrium can be detected by sensing changes in temperature to or from the process, or in energy exchange rates, from cycle to cycle. An energy exchange rate set point can be set to an initial value during startup, and then reset to an equilibrium value. Energy efficient operating conditions can be determined by comparing circulator energy consumption with thermal energy exchange rates over a range of flow rates and/or temperatures to the process. Cooling flow pulse timing can be graphically adjusted.
摘要:
A temperature control device (14) for a shaping tool (3) or component of a shaping working machine comprising at least one temperature control branch (2, 2′) connected to a feed (5), and a pump system including at least one pump (13) for the delivery of temperature control medium in the feed (5), wherein there is provided at least one sensor by which at least one of the parameters from the group of temperature, through-flow amount and pressure can be detected and that there is provided a control or regulating device for regulating or controlling a delivery of the pump system, to which signals from the at least one sensor can be fed. A method of operating such a device is also described.
摘要:
In a method of controlling the temperature of an injection or diecasting mold, the respective temperature of the mold being detected by at least one sensor and compared to a set point and coolant, in particular cooling water, being metered and added through cooling channels disposed in the mold in dependence on detected overshooting or undershooting of the set point, it is provided, with a view to avoiding any overswinging of the control, that opening the valves for metering the coolant is allocated to one threshold and closing the valves to the other.
摘要:
The injection molding device of the present invention is provided with a supply pipe which supplies a heat medium to a mold, a discharge pipe which discharges the heat medium from the mold, a mold temperature adjustor to which the supply pipe and the discharge pipe are connected to adjust the temperature of the mold, and a discharge rate adjusting unit which is provided with a variable flow control valve installed on the discharge pipe to adjust a flow rate of the heat medium, a discharge pipe variable flow control valve bypass pipe for bypassing the variable flow control valve and a discharge pipe bypass on-off valve installed on the bypass pipe to change a flow rate of the heat medium and which is installed at a position upstream from the mold temperature adjustor on the discharge pipe.
摘要:
An apparatus for molding composite articles includes a pair of opposed matched-tool mold sections, each having a rigid housing and a thin, semi-rigid membrane removably and sealably mounted on the housing so as to define a fluid-tight chamber therein. The chamber of each mold section is filled with a noncompressible heat-conductive fluid to provide fluid backing to the portions of each membrane defining the molding surfaces of each mold section. A system of temperature control coils extending within each chamber are connected to an external heater/chiller unit to permit circulation therethrough of a suitable temperature control fluid, whereby positive control of the temperature of the backing fluid and, correlatively, the molding surfaces of the membranes.
摘要:
Provided is a temperature control device having at least one temperature control branch connected to a feed, and a pump system including at least one pump for the delivery of temperature control medium in the feed. Additionally, the temperature control device is provided with at least one sensor by which at least one of the parameters from the group of temperature, through-flow amount and pressure can be detected, and a control or regulating device for regulating or controlling a delivery of the pump system, to which signals from the at least one sensor can be fed.
摘要:
A closed-loop control device includes a target value entrance for inputting a target value for at least one control value, an actual value entrance for inputting an actual value for the at least one control value, wherein the actual value is determined based on the at least one measuring value, a calculation unit for calculating the actuation value based on a deviation of the actual value from the target value in such a way that the actual value follows the target value, and a control exit for outputting the actuation value for the actuator of the at least one tempering circle. The calculation unit is configured in such a way that the actuation value is calculated based on the present operating point or in a manner adapted to the present operating point.
摘要:
A temperature control apparatus includes a temperature control branch connected to a feed line for a temperature control medium, a pump system including a pump for conveying the medium, a pump open-loop or closed-loop control device for controlling the output of the pump system, a throttle device having a variable degree of opening for throttling a quantitative through-flow of the medium in the temperature control branch, and an open-loop or closed-loop control device with the degree of opening of the throttle device as a setting value and with a control variable from the group: degree of opening of the throttle device, temperature, temperature difference, through-flow, pressure or a physical value to be derived from that group. The pump open-loop or closed-loop control device provides for open-loop or closed-loop control of the delivery output of the pump system depending on the degree of opening of the throttle device.
摘要:
The injection molding device of the present invention is provided with a supply pipe which supplies a heat medium to a mold, a discharge pipe which discharges the heat medium from the mold, a mold temperature adjustor to which the supply pipe and the discharge pipe are connected to adjust the temperature of the mold, and a discharge rate adjusting unit which is provided with a variable flow control valve installed on the discharge pipe to adjust a flow rate of the heat medium, a discharge pipe variable flow control valve bypass pipe for bypassing the variable flow control valve and a discharge pipe bypass on-off valve installed on the bypass pipe to change a flow rate of the heat medium and which is installed at a position upstream from the mold temperature adjustor on the discharge pipe.
摘要:
A method of molding composite articles including arranging a pair of matched-tool mold sections in an opposed relationship, each mold section having a rigid housing and a thin, semi-rigid membrane removably and sealably mounted on the housing so as to define a fluid-tight chamber; filling the fluid-tight chambers with a non-compressible backing fluid; and accommodating thermal expansion of the backing fluid by an expansion chamber in fluid communication with the fluid tight chambers. The method further includes defining a mold plenum between the semi-rigid membranes when the mold sections are closed together; inserting reinforcement materials between the semi-rigid membranes prior to closing the mold sections; and injecting and curing a molding fluid after closing the mold sections. A step for regulating the temperature of the backing fluid may be included wherein a system of coils extend within each fluid tight chamber and wherein the coils are connected to an external heater/chiller unit and the coils are operative to circulate a temperature control fluid therethrough.