摘要:
A power supply unit for a discharge machining apparatus which eliminates overshooting in current rise and improves the electrode consumption characteristics by preventing an operational amplifier as well as a current control element from being saturated, thereby eliminating overshooting during the rise time of the machining current, by clamping the output voltage of the operational amplifier during the stand-by time for electric discharge. The output is clamped by a plurality of resistors and diodes to a state where the output voltage is higher than a power-supply voltage (the output clamp level is set by a resistor). Namely, during the stand-by time when inverted amplification (feedback) via a resistor in an operational amplifier is being carried out, a constant state of feedback is maintained by the diodes.
摘要:
In a power supply apparatus of an electrical discharge machine, a power supply high in efficiency and small in current ripple is provided to achieve a power supply reduced in size and price. In addition, a switching power supply system is used jointly to generate an optional waveform. A first switching device is switched on/off in an optional cycle under the control of a current command value signal corresponding to the waveform shape of a current pulse to be supplied to a machining gap, whereby an optional shape of current pulse is supplied to the machining gap and a current component which compensates for a current ripple generated by said switching at the time of supplying said current is superimposed on said optional shape of current pulse and is supplied to the machining gap.
摘要:
A tool path display apparatus (20) includes a tool coordinate value calculation unit (22) that calculates tool commanded coordinate values and tool actual coordinate values, based on commanded value time series data of position commands for a plurality of axes, detected value time series data of position detected values for the plurality of axes, and the structure of a machine tool, an acceleration calculation unit (23) that calculates accelerations of a tip point of a tool using the tool commanded coordinate values and the tool actual coordinate values, and a display format selection unit (24) that selects display formats of the accelerations of the tool commanded coordinate values and the tool actual coordinate values.
摘要:
A numerical controller capable of visually and accurately analyzing a change of the tool trajectory before and after changing a processing condition, whereby a parameter of a drive axis can be properly adjusted. The numerical controller comprises a numeric controlling part which controls each drive axis based on a predetermined position command; a position data obtaining part which obtains position data of each drive axis controlled by the numerical controlling part; a tool coordinate calculating part which calculates a coordinate of a tool center point based on position feedback or obtained position data of each drive axis and information of a mechanical structure of a machine tool; a tool trajectory storing part which stores the calculated coordinate of the tool center point as a feedback trajectory; and a displaying part which displays the stored feedback trajectory on a display.
摘要:
A compiler apparatus, which can perform software pipelining optimization that has a considerable effect of reducing the number of execution cycles taken to complete a loop process, converts a source program into a machine program for a processor which is capable of parallel processing. The compiler apparatus is composed of: a parsing unit operable to parse the source program and then to convert the source program into an intermediate program which is described in an intermediate language; an optimization unit operable to optimize the intermediate program; and a conversion unit operable to convert the optimized intermediate program into the machine language program, wherein the optimization unit is operable to execute software pipelining, by inserting a transfer instruction, which is used for transferring data between operands, into a loop process included in the intermediate program so that a data dependence relation is changed.
摘要:
A program re-writing method which re-writes an inputted program into a program for a processor for controlling whether or not a process is executed based on a yes or no execution flag, said program re-writing method including: inserting a comparison process into the inputted program, the comparison process comparing first address information, which is memory address information accessed by a first memory access process included in the inputted program, and second address information, which is address information of a memory accessed by a second memory access process included in the inputted program, and writing a comparison result into the yes or no execution flag; and inserting a yes or no execution flag-attached logic preservation process into the inputted program, the yes or no execution flag-attached logic preservation process being a process executed based on a value of the yes or no execution flag and preserving the same result as a result of the inputted program when executed.
摘要:
A compiler apparatus, which can perform software pipelining optimization that has a considerable effect of reducing the number of execution cycles taken to complete a loop process, converts a source program into a machine program for a processor which is capable of parallel processing. The compiler apparatus is composed of: a parsing unit operable to parse the source program and then to convert the source program into an intermediate program which is described in an intermediate language; an optimization unit operable to optimize the intermediate program; and a conversion unit operable to convert the optimized intermediate program into the machine language program, wherein the optimization unit is operable to execute software pipelining, by inserting a transfer instruction, which is used for transferring data between operands, into a loop process included in the intermediate program so that a data dependence relation is changed.
摘要:
Disclosed is a compiler apparatus for generating an instruction code composed of instruction sets each including an instruction that designates an m-bit immediate value indicating a location of a data item in a memory area. The compiler apparatus sequentially selects, based on one data attribute, a data item from a group X composed of a plurality of data items; and judges, each time a data item is selected, whether the selected data item is allocatable to an n-byte memory area (n≦2m). When the judgment is negative, the compiler apparatus specifies, based on a different data attribute, a data item out of all the selected data items and excludes the specified data item from the group X, and repeats the selection until all the data items remaining in the group X after excluding specified data items are judged to be allocatable to the memory area.
摘要:
An optimization apparatus is capable of improving the execution efficiency of a loop that includes a loop carry dependency between consecutive iterations of the loop. For example, a value resulting from one iteration is used in an immediately following iteration. When the arithmetic expression “a[i+1]=a[i]*3+2;” is included in a loop body, and a value resulting from the arithmetic expression “a[i+1]=a[i]*3+2;” in one iteration is used in a following iteration, execution delays occur in pipeline processing of the loop. Here, the arithmetic expression “a[i+1]=a[i]*3+2;” is transformed into the arithmetic expression “a[i+4]=a[i]*81+80;” to expand the dependency distance. By doing so, the execution delays can be decreased.
摘要:
When a branch instruction is decoded by the instruction decoders 409a˜409c, the upper 29 bits of the PC relative value included in the branch instruction are sent to the upper PC calculator 411 and the lower 3 bits are sent to the lower PC calculator 405. The lower PC calculator 405 adds the lower 3 bits of the PC relative value and the lower 3 bits of the present lower PC 404 and sends the result to the lower PC 404 as the updated lower PC. The upper PC calculator 411 adds the upper 29 bits of the PC relative value, the upper 29 bits of the present upper PC 403, and a carry that may be received from the lower PC calculator 405, and sends the result to the upper PC 403 as the updated upper PC.