摘要:
A numerical control unit and associated method are provided for controlling a machine tool having linear and rotating axes. The control unit is adapted to machine the workpiece at an instructed feedrate, whereby it is first determined whether the machining mode is in a purely linear interpolation mode (G1). The control unit is also adapted to determine, if in the linear interpolation mode, whether a move command is for the rotating axis alone, this being the case, determining a new radial distance between the tool starting position and the center of the rotating axis. With these determinations, the instructed feedrate is corrected to become a feedrate equal to the actual relative speed of the tool with respect to the workpiece.
摘要:
A fuzzy interference device and method are rule. When inference is made between a first plurality provided according to which fuzzy rules are defined (n) of rules with a second plurality of rules, the result is comprising a condition (IF) and a conclusion (THEN) a sum of the membership functions expressed as a sum part. The associated membership functions are calcu- of the areas (Si) and centers of gravity (Li). lated as an area (Si) and a center of gravity (Li) for each
摘要:
A numerical control unit for a machining apparatus which operates under the control of a machining program comprising a plurality of blocks, such blocks being adapted to define a command or instruction for specifying and automatically controlling the relative movement between a machine tool and a workpiece with respect to one or more of linear and rotational axes, and being modifiable at starting-point and end-point areas in a single block to specify desired variations in relative movement or feedrate. The feedrate may be controlled on the basis of preset rules within a single block without dividing a machining path into a plurality of blocks for controlling the feedrate, the preset rules being changeable by an operator whereby his machining know-how can easily be incorporated into the machining program. Rules incorporating machining know-how are set in a knowledge storage section, an inferring section is provided independently of the knowledge storage section to ensure ease of additions and corrections to the rules, and the inferring section synthesizes the results of inference provided by a plurality of rules and deduces a final conclusion, whereby complex control can be easily achieved with various factors taken into consideration. Rules set in the knowledge storage section can be described in a production rule format, allowing a final conclusion to be achieved by fuzzy inference. In such case, efficient processing is enhanced by providing that inference is only made as to rules judged as necessary to be executed, membership functions in the conclusion part of a fuzzy rule are represented in a simple shape pattern, the results of all selected rules are considered and the relative significance of the selected rules are reflected on a conclusion.
摘要:
A wire electrical discharge machine is provided with a rotating shaft (21) for rotating a workpiece (1). In wire electrical discharge machining according to a machining program, a current average rotation radius at a current workpiece machining point (8a, 8b) is calculated for each predetermined period, based on average rotation radii at respective end points of a block to be executed and a directly preceding block and an amount of movement of the rotating shaft. Based on the calculated current average rotation radius, control is performed such that the speed of movement of the wire electrode (2) relative to the workpiece machining point (8a, 8b) agrees with a command speed acquired from a machining power supply.
摘要:
A fuzzy interference device and method are provided according to which fuzzy rules are defined comprising a condition (IF) and a conclusion (THEN) part. The associated membership functions are calculated as an area (Si) and a center of gravity (Li) for each rule. When inference is made between a first plurality (n) of rules with a second plurality of rules, the result is a sum of the membership functions expressed as a sum of the areas (Si) and centers of gravity (Li).
摘要:
A numerical control unit is provided which is operative to machine a workpiece at a predetermined feedrate along a machining path. A machining program (44) defines a starting point area (L1) and an end point area (L4) along the machining path in which the feedrate takes on specific values. Means are provided for changing the feedrate adjacent to the starting point (L1) and end point (L4) areas defined in a single block in the machining program.
摘要:
A numerical control unit is provided which is operative to machine a workpiece at a predetermined feedrate along a machining path. A machining program (44) defines a starting point area (L1) and an end point area (L4) along the machining path in which the feedrate takes on specific values. Means are provided for changing the feedrate adjacent to the starting point (L1) and end point (L4) areas defined in a single block in the machining program.
摘要:
A numerical control unit for a machining apparatus which operates under the control of a machining program comprising a plurality of blocks, such blocks being adapted to define a command or instruction for specifying and automatically controlling the relative movement between a machine tool and a workpiece with respect to one or more of linear and rotational axes, and being modifiable at starting-point and end-point areas in a single block to specify desired variations in relative movement or feedrate. The feedrate may be controlled on the basis of preset rules within a single block without dividing a machining path into a plurality of blocks for controlling the feedrate, the preset rules being changeable by an operator whereby his machining know-how can easily be incorporated into the machining program. Rules incorporating machining know-how are set in a knowledge storage section, an inferring section is provided independently of the knowledge storage section to ensure ease of additions and corrections to the rules, and the inferring section synthesizes the results of inference provided by a plurality of rules and deduces a final conclusion, whereby complex control can be easily achieved with various factors taken into consideration. Rules set in the knowledge storage section can be described in a production rule format, allowing a final conclusion to be achieved by fuzzy inference. In such case, efficient processing is enhanced by providing that inference is only made as to rules judged as necessary to be executed, membership functions in the conclusion part of a fuzzy rule are represented in a simple shape pattern, the results of all selected rules are considered and the relative significance of the selected rules are reflected on a conclusion.