JPH03144807A - Dry run controller for nc device - Google Patents

Abstract

PURPOSE:To satisfactorily reduce the shock applied to a work tool at the time of executing dry run without deteriorating the work accuracy in a normal state by providing a 1st acceleration/deceleration part which performs the acceleration/deceleration in a normal working state and a 2nd acceleration/ deceleration part which performs the acceleration/deceleration at the time of executing dry run to form an acceleration/deceleration part. CONSTITUTION:The parameter of a 2nd acceleration/deceleration part 25b is set larger than the rise-up time or the breaking time of acceleration/ deceleration set by the parameter of a 1st acceleration/deceleration part 26a. The part 26b is switched to the part 26a via a switch SW when the acceleration/ deceleration is required after distribution in a normal working mode. On the other hand, the part 26a is switched to the part 26b at the time of executing dry run. As a result, the work accuracy is never deteriorated in the normal working state and the satisfactory acceleration/deceleration is applied in a dry run state respectively. Then the speed change is reduced and the shock applied to a work tool can be evaded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an NC device having a dry run mode in which a controlled object such as a machining tool or a table is idly fed in order to check a machining program. In detail, in order to move the machining tool, an axial movement amount for each axis is generated based on the input machining program, and an acceleration/deceleration section applies a distributor to the axial movement amount according to preset parameters. In an NC device that applies deceleration, generates a movement amount after distribution, and gives a position command to a servo part, the acceleration/deceleration part is divided into a first acceleration/deceleration part that performs acceleration/deceleration during normal machining, and a first acceleration/deceleration part that performs acceleration/deceleration during normal machining. It is composed of a second acceleration/deceleration section that performs deceleration, and the parameters of the second acceleration/deceleration section are set to be longer than the rise time or fall time of the distributor acceleration/deceleration by the first acceleration/deceleration section, The present invention relates to a dry run control device for an NC device that effectively performs acceleration and deceleration during dry run without reducing machining accuracy.

[Prior Art] Conventionally, as shown in FIG. 2, an analysis unit 22 generates axis movement data for each fixed interval based on an input machining program in order to move a machining tool or table.
and a distribution unit 24 that generates the axis movement amount of each axis per sampling based on this axis movement data, and a distribution unit 24 that applies distributor acceleration/deceleration to the axis movement amount according to preset parameters to calculate the movement amount after distribution. an accelerating/decelerating section 26 that generates an acceleration/deceleration, an integrating section 28 that integrates the amount of movement after distribution and generates a position command for the servo section 30, and controls the drive motor of each axis in response to the position command to move the processing tool. In order to check the machining program in an NC device equipped with a servo section 30 that controls the machining process, the machining tool is fed in a mode called dry run.

In general, machining tool feed during dry run is performed in the same manner as machining feed during cutting. Since the feed rate during cutting is not that high, acceleration/deceleration is not performed before generating the axial movement amount of each axis in the distribution unit 24, that is, before distribution. No deceleration occurs.

By the way, since machining is not involved, the feed rate during dry run is faster than the feed rate during normal cutting. For this reason, when feeding is performed such that the speed between blocks or between axes changes greatly, a large shock is applied to the machining tools and the like.

The reason for this is as follows. That is, as shown in FIG. 3, the current position of the processing tool is X=O1Y=0(7
), after moving 100mm in the + direction of the X-axis at a speed of 100te,
If you run a program that moves 50111[D] in the Y-axis + direction, at the joint of the block indicated by arrow A in the figure,
X glaze speed from 100 to 0, Y axis speed from O to 10
It changes significantly to 0. In this way, even if the moving speed is constant at 100, the speed between blocks and between axes may vary greatly.

In this case, the velocity V XC1V yc for each axis is shown in Figure 4a,
As shown in b. As can be understood from Figure 4 a and b, the speed command changes from 0 to f or from f to 0, but the actual response is the response time constant of the servo system, as shown in Figure 4 c and d. With a rise time of about
s V y f changes from 0 to f or from f to O.

Therefore, when the speed command value f is small, the difference in speed is small, but in the case of dry run, the feed speed is high, and when the speed changes greatly in this way, the acceleration increases, causing a large shock (movement) to the machining tool. become.

Therefore, in order to reduce the shock acting on the machining tool so that it is not a problem, it is possible to consider a method in which acceleration/deceleration is performed after the axial movement amount of each axis is generated in the distribution section 24, that is, after the distribution.

To do this, the acceleration/deceleration section 26 applies distributor acceleration/deceleration to the axis movement amount according to a preset time constant to generate the distributor movement amount, but this reduces the shock acting on the processing tool. In order to do this, it is necessary to set a sufficiently large time constant and apply sufficient acceleration/deceleration to reduce speed changes.

If this time constant is set large, the distribution section 2
In step 4, after the axial movement amount of each axis is generated, that is, when acceleration/deceleration is performed after distribution, a problem arises in that processing accuracy decreases.

The reason for this is as follows. That is, Fig. 3,
As shown in the fourth rXJ, the speed response has a delay in the rise time due to the delay in the servo system relative to the command. Due to the existence of such a delay, the machining tool
As shown in the figure, an error will occur on the movement path.

If acceleration/deceleration is performed after distribution, this delay will increase, so
The error in the movement path of the machining tool increases, and machining accuracy decreases.

[Problems to be Solved by the Invention] As described above, in the conventional dry run control device, the parameters are fixed to one in the acceleration/deceleration section 26 after distribution. If the time constant is increased, the machining accuracy during normal machining is reduced, and conversely, if the time constant is decreased, the shock acting on the machining tool during dry run cannot be sufficiently reduced.

Therefore, the present invention has been made to overcome the above-mentioned disadvantages, and is an NC device that can sufficiently reduce the shock acting on a machining tool during dry run without reducing the machining accuracy during normal machining. The object of the present invention is to provide a dry run control device for use in a dry run.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention includes an analysis unit that generates axis movement data for each fixed section based on an input machining program in order to move a controlled object. , a distribution unit that generates an axis movement amount of each axis per sampling based on the axis movement data, and a distributor that applies distributor acceleration/deceleration to the axis movement amount according to a preset variable make to generate a distributor movement amount. an acceleration/deceleration section, an integration section that integrates the amount of movement of the distributor to generate a position command for the servo section, and a servo section that controls the drive motor of each axis in response to the position command to move the controlled object. In the NC apparatus, the acceleration/deceleration section includes a first acceleration/deceleration section that performs acceleration/deceleration during normal machining; The rise time or fall time of the distributor acceleration/deceleration by the second acceleration/deceleration part is the same as the rise time or fall time of the distributor acceleration/deceleration by the first acceleration/deceleration part. The parameter of the second acceleration/deceleration section is set so as to be longer than the time or fall time.

[Function] Since the dry run control device according to the present invention is configured as described above, it exhibits the following functions. In other words, when accelerating and decelerating the distributor during normal machining, the first
The acceleration/deceleration section is switched to the acceleration/deceleration section of No deterioration in accuracy occurs.

Also, during dry run, switch to the second acceleration/deceleration section,
Apply distributor acceleration/deceleration with a long rise time or fall time based on parameters to the axis movement amount of each axis generated in the distribution section, and apply sufficient acceleration/deceleration to generate the distributor movement amount. This makes it possible to reduce speed changes and prevent shock from acting on the machining tool.

[Example] Next, a preferred example of the dry run control device according to the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a dry run control device according to the present invention.

In FIG. 1, a dry run control device 10 includes an analysis unit 22 that generates axis movement data for each fixed interval based on an input machining program, and an analysis unit 22 that generates axis movement data for each fixed interval in order to move a processing tool or table, etc. a distribution unit 24 that generates the axis movement amount of each axis per sampling, and a first acceleration/deceleration that applies distributor acceleration/deceleration to the axis movement amount according to preset parameters and generates a distributed return movement amount. section 26a, second acceleration/deceleration section 28b, switch SW for switching between first acceleration/deceleration section 26a and second acceleration/deceleration section 26b, and first acceleration/deceleration section 26a or second acceleration/deceleration section 26b. an integration unit 82B that integrates the generated distributed return movement amount to generate a position command for the servo unit 30; and a servo unit 30 that responds to the position command and controls the drive motor of each axis to move the processing tool. It consists of

The parameters of the second acceleration/deceleration section 26b are set to be longer than the rise time or fall time of acceleration/deceleration determined by the parameters of the first acceleration/deceleration section 26a. If acceleration/deceleration after distribution is required, switch to the first acceleration/deceleration section 26a,
During a dry run, the second acceleration/deceleration section 26b is used. In addition, this acceleration/deceleration section 2
The acceleration/deceleration functions set in 6a and 26b may be linear functions or exponential functions, and desired curves can be set.

The dry run control device 10 according to the present invention is basically configured as described above, and its operation and effects will be explained below.

When a machining program is input to move a machining tool or the like, the analysis unit 22 generates axis movement data for each predetermined section based on this machining program. This axis movement data is given to the distribution unit 24, and based on this data, the axis movement amount of each axis per sampling is generated.

During normal machining, the switch SW is switched to the acceleration/deceleration unit 2Sa side, and the axial movement amount of each axis is determined by applying distributor acceleration/deceleration to the axis movement amount according to preset parameters to generate the distribution return movement amount. is applied to the first acceleration/deceleration section 26a. The distributed backward movement amount generated by the first acceleration/deceleration section 26a is given to the servo section 30 via the integration section 28, and the drive motor of each axis is controlled, thereby controlling the movement of the processing tool.

On the other hand, during dry run, the switch SW is activated by the acceleration/deceleration section 26.
A second acceleration/deceleration unit 26b is switched to the b side, and the axis movement amount of each axis is changed by applying distributor acceleration/deceleration to the axis movement amount according to a preset parameter to generate a distribution return movement amount.
given to.

The distributed return movement amount generated by the second acceleration/deceleration section 26b is given to the servo section 30 via the integration section 28, and the movement of the processing tool is controlled.

Here, the parameters of the second acceleration/deceleration section 26b are set such that the rise time or fall time of the acceleration/deceleration of the distributor is longer than the rise time or fall time of the acceleration/deceleration by the first acceleration/deceleration section 26H. This setting does not reduce machining accuracy during normal machining, and the shock acting on the machining tool during dry run can be sufficiently reduced.

[Effects of the Invention] Since the dry run control device according to the present invention is configured as described above, it has the following effects.

That is, an acceleration/deceleration section that applies distributor acceleration/deceleration to the axis movement amount according to preset parameters and generates a distribution return movement amount is connected to a first acceleration/deceleration section that performs acceleration/deceleration during normal machining, and a dry run a second acceleration/deceleration section that performs acceleration/deceleration of time, and the rise time or fall time of the distributor acceleration/deceleration by the second acceleration/deceleration section is longer than the time of distributor acceleration/deceleration by the first acceleration/deceleration section. Parameters are set so that the acceleration/deceleration section is also large, and in the dry run mode, the acceleration/deceleration section is switched to the second acceleration/deceleration section.

Therefore, when accelerating/decelerating the distributor during normal machining, the distributor is applied to the amount of axial movement of each axis generated in the distributor 24 based on the parameters set in the first acceleration/deceleration section. To give deceleration and generate distributed return movement,
No deterioration in machining accuracy occurs. Also, during dry run, based on the parameters set in the second acceleration/deceleration section, distributor acceleration/deceleration is applied to the axis movement amount of each axis generated in the distribution section 24 to generate the distribution return movement amount. , Sufficient acceleration/deceleration is applied, speed changes can be made small, and shocks acting on the machining tool can be prevented.

As mentioned above, the dry run control device in the NC device according to the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to these embodiments, and within the scope of the gist of the present invention, Of course, various improvements and changes in design are possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a dry run control device according to the present invention, FIG. 2 is a block diagram of a device for explaining conventional dry run control, and FIG. 3 is a diagram for explaining an example of speed change of a processing tool. FIGS. 4a to 4d are diagrams showing the speed commands for each axis and the speed response, and FIG. 5 is a diagram for explaining the movement path of the processing tool. 10...Dry run control device 22...Analysis section 2
4... Distribution parts 26a, 26b... Acceleration/deceleration part 28... Integration part 30... Servo part

Claims (4)

[Claims] (1) An analysis unit that generates axis movement data for each fixed interval based on the input machining program in order to move the controlled object, and an axis movement amount of each axis per sampling based on the axis movement data. an acceleration/deceleration section that applies post-distribution acceleration/deceleration to the axis movement amount according to preset parameters to generate a post-distribution movement amount; It includes an integrating section that generates a command, and a servo section that responds to the position command and controls the drive motor of each axis to move the controlled object, and feeds the controlled object in order to check the machining program. In the NC device having a dry run mode, the acceleration/deceleration section includes a first acceleration/deceleration section that performs acceleration/deceleration during normal machining, and a second acceleration/deceleration section that performs acceleration/deceleration during the dry run.
an acceleration/deceleration section, and the rise time or fall time of the distributed acceleration/deceleration by the second acceleration/deceleration section is longer than the rise time or fall time of the distributed acceleration/deceleration by the first acceleration/deceleration section. The second
N characterized by setting parameters of the acceleration/deceleration section of
Dry run control device in C device. (2) In the dry run control device for an NC device according to claim 1, in the dry run mode, the second
1. A dry run control device for an NC device, characterized by switching to an acceleration/deceleration section. (3) The dry run control device for an NC device according to claim 1, wherein the rise characteristic or fall characteristic of the second acceleration/deceleration section is a linear function. (4) The dry run control device for an NC device according to claim 1, wherein the rise characteristic or fall characteristic of the second acceleration/deceleration section is an exponential function.