A method of controlling an additive manufacturing process in which a directed energy source is used to selectively melt material to form a workpiece, forming a melt pool in the process of melting, the method comprising: using an imaging apparatus to generate an image of the melt pool comprising an array of individual image elements, the image including a measurement of at least one physical property for each of the individual image elements; from the measurements, mapping a melt pool boundary of the melt pool; computing a geometric length of the melt pool boundary; and controlling at least one aspect of the additive manufacturing process with reference to the geometric length.

Method for melt pool monitoring using geometric length

The invention provides a method for separating related components of a single-axis dynamic error instruction of a numerical control machine tool. The method comprises the steps of synchronously collecting instruction position data generated by interpolation of a numerical control system, feedback position data of a servo feeding system and actual position data of the tail end of an actuator in single-axis feeding motion of the numerical control machine tool; calculating to obtain an in-loop dynamic error and an out-loop dynamic error; solving a first-order difference quotient, a second-order difference quotient and a third-order difference quotient of the instruction position data to obtain an instruction speed, an instruction acceleration and an instruction jerk, and separating instruction speed, acceleration and jerk related components of the in-loop dynamic error and the out-loop dynamic error; and finally, establishing a multiple linear regression model by adopting a multiple linear regression analysis method, and carrying out hypothesis testing on a regression equation and a partial regression coefficient. Separation of related components of the instruction speed, the instruction acceleration and the instruction jerk is achieved.

Method for separating related components of single-axis dynamic error instruction a numerical control machine tool

A thermal compensation control system for a machine tool having a milling cutter and a cutter driver includes a tool setting probe, a temperature sensor, a workpiece touch probe, and a controller. The cutter driver is connected to the milling cutter to drive the milling cutter to process the work piece based on a control signal. The tool setting probe is configured to detect a cutter length of the milling cutter. The temperature sensor is configured to sense a measured temperature of the cutter driver or the milling cutter. The workpiece touch probe is configured to measure processing errors of the processed work piece. The controller is configured to generate the control signal based on a processing instruction, a temperature compensation model, the cutter length, and the measured temperature. The controller is further configured to determine whether to modify the temperature compensation model based on the processing errors.

Thermal compensation method and thermal compensation control system for machine tools

A thermal compensation control system for machine tool, applicable for a machine tool having a milling cutter and a cutter driver, has a cutter length detector, a temperature sensor, a work piece sensor, and a controller. The cutter driver is connected to the milling cutter and configured to drive the milling cutter to process the work piece based on a control signal. The cutter length detector is configured to detect a cutter length of the milling cutter. The temperature sensor is configured to sense a measured temperature corresponding to the cutter driver or the milling cutter. The work piece sensor is configured to measure a set of processing errors of the processed work piece. The controller is electrically connected to the cutter driver, the cutter length detector, the temperature sensor, and the work piece sensor. The controller is configured to generate the control signal based on a processing instruction, a temperature compensation model, the cutter length, and the measured temperature. The controller is also configured to determine whether to modify the temperature compensation model or not based on the set of processing errors.

Thermal compensation control system for machine tool and method thereof

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Thermal compensation method and thermal compensation control system for machine tools

Thermal compensation control system for machine tool and method thereof