WO2018120098A1 - Method for recording processing track with bitmap and numerical control apparatus - Google Patents

Abstract

Disclosed is a method for recording a processing track with a bitmap and a numerical control apparatus. The method comprises: acquiring a recording range of a bitmap and a processing track point of a cutting tool; determining whether the acquired processing track point of the cutting tool is located within the recording range of the bitmap, and if the acquired processing track point of the cutting tool is within the recording range of the bitmap, continuing acquiring a processing track point of the cutting tool; and if the acquired processing track point of the cutting tool is not within the recording range of the bitmap, adjusting the recording range of the bitmap so as to make the acquired processing track point of the cutting tool be within the recording range of the bitmap. By means of the method for recording a processing track with a bitmap, not only can a complete processing track be recorded, the resolution of a bitmap can also be increased where the storage amount is the same.

Description

Method for recording processing track by using bitmap and numerical control device

[Technical Field]

The invention relates to the field of real-time recording of processing trajectories in the processing of numerically controlled machine tools, in particular to a method for recording trajectories by using bitmaps and a numerical control device.

 【Background technique】

CNC machine tools can automatically complete the machining according to the processing code written beforehand, so it has unparalleled advantages in processing efficiency and process repeatability. In order to ensure the correctness of the machining code and further optimize the machining code, the advanced CNC machine will record the machining path of the tool in real time during machining and draw it on the display screen so that the technician can analyze whether the machining code conforms to the design. Requirements, and whether further optimization is needed. It can be seen that how to effectively record and display the processing trajectory is an important function of the numerical control system. The existing methods for recording machining trajectories of CNC machine tools are generally divided into two categories, one is bitmap recording and the other is vector recording.

The vector record records directly record the coordinates of the machining path in the data structure. When the graphic display is to be performed, the track information in the data structure is drawn into the graphic by drawing. Since the recorded information is directly recorded in the data structure, it is drawn onto the screen when it needs to be displayed, so the displayed result is not distorted by the enlarged picture. However, in order to accurately record the trajectory of the machining, the numerical control machine tool needs to record the trajectory point at the time interval of the order of ten milliseconds, and the processing duration of the numerically controlled machining machine is generally long, sometimes even one or two days. In such a long period of time, the number of track points recorded by CNC machine tools will be very large, and it is difficult to record such track points by using a numerical control system with relatively large memory. Even if the machining path can be recorded, it will take a lot of computational efficiency in the subsequent process of drawing the machining path to the display screen.

The bitmap record is a picture file with a certain length and width of pixels, and the track point is changed from the actual machine coordinate to the length and width coordinates of the picture according to a certain conversion calculation, because all track points are saved in the same picture, and the number of points does not exist. The problem of more storage space required, there is also no problem with the efficiency of the bitmap to the display. Due to the limitation of system storage space and computational efficiency, the size of the picture is generally not very large. Before drawing the track point onto the picture, it is necessary to determine the machine coordinate range of the picture record. During the recording process, the track point is converted to a pixel on the picture. There is a problem here: if you want to display something smaller than a pixel on the image, the bitmap will be powerless. The reason for this problem is that the original setting of the picture should not be too small for the actual coordinate range, because at least it should cover the machine's machinable operating range; but in actual machining, the range of the path is mostly in the majority of cases. It may all be in a small range. In this case, when the small-scale trajectory map is enlarged and observed, it will be subject to the resolution limitation of the picture, and no clear result can be obtained.

 [Summary of the Invention]

The object of the present invention is to provide a method and a numerical control device for recording a processing trajectory by using a bitmap which can completely record a processing trajectory and clearly distinguish a processing trajectory.

The invention provides a method for recording a processing trajectory by using a bitmap, comprising: acquiring a recording range of a bitmap and a tool processing trajectory point; determining whether the acquired tool processing trajectory point is within a recording range of the bitmap; if the acquired tool If the machining track point is within the recording range of the bitmap, the tool processing track point is continuously acquired; if the acquired tool machining track point is not within the recording range of the bitmap, the recording range of the bitmap is adjusted, so that the acquired tool is obtained. The machining track point is within the recording range of the bitmap.

Preferably, the step of determining whether the processing track point is within the recording range of the bitmap comprises: determining, for each tool machining track point, whether the abscissa of the tool processing track point is within the abscissa range of the bitmap recording range, and Whether the ordinate of the tool machining path point is within the ordinate coordinate range of the bitmap recording range. If both are present, the tool machining path point is within the recording range of the bitmap. If one is not, the tool processing track point is located. The bitmap is outside the scope of the record.

Preferably, the step of acquiring the processing track point comprises: establishing a pre-storage queue, each acquiring a new tool processing track point, and placing the new tool processing track point into the pre-storage queue; each time acquiring N new tool processing track points, The N new tool processing track points are connected into a fold line according to the time sequence of adding the pre-storage queue; establishing a first rectangle just covering the N processing track points, determining whether the abscissas of the two diagonal vertices of the first rectangle are Both are within the abscissa range of the bitmap record range, and whether the ordinates of the two diagonal vertices of the first rectangle are within the ordinate range of the bitmap record range, and if all are, then N process track points are Within the record range of the bitmap, if one is not present, the N machining track points are outside the recording range of the bitmap.

Preferably, the recording range of the bitmap is adjusted in real time according to the processing trajectory, so that the step of adapting the recording range of the bitmap to the processing trajectory comprises: establishing a second rectangle that just covers the acquired processing trajectory, and recording the range of the bitmap The center point translates to coincide with the center point of the second rectangle.

Preferably, the recording range of the bitmap is adjusted in real time according to the processing trajectory, so that the step of adapting the recording range of the bitmap to the processing trajectory comprises: scaling the recording range of the bitmap by proportional K.

The present invention also provides a numerical control apparatus including a processor and a memory for performing a method of recording a processing trajectory using a bitmap as described above.

The method for recording a processing trajectory by using the bitmap and the numerical control device provided by the present invention, according to the prior art that the recording range of the bitmap is always the maximum motion range of the machine tool, by first setting a bitmap record with a small coverage area. Range, and then continuously adjust the recording range of the bitmap during the workpiece machining process, so that the recording range of the bitmap matches the coverage of the entire tool processing trajectory as much as possible, so that the entire machining trajectory is recorded and increased in the same storage amount. The resolution of the graph.

 [Description of the Drawings]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

Figure 1 is a step diagram of recording a processing trajectory using a bitmap;

2 is a step diagram of a second embodiment for determining whether a processing track point is within a recording range of a bitmap;

Fig. 3 is a schematic block diagram of a numerical control apparatus to which an embodiment of the present invention is applied.

【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment provides a method for recording a processing trajectory by using a bitmap and a numerical control device, comprising the following steps:

S100 acquires the recording range of the bitmap and the tool processing track point;

S200 determines whether the acquired tool processing track point is within the recording range of the bitmap;

S300 If the acquired tool machining path point is within the recording range of the bitmap, continue to acquire the tool machining track point;

S400 If the acquired tool machining path point is not within the recording range of the bitmap, adjust the recording range of the bitmap so that the acquired tool machining path point is within the recording range of the bitmap.

In step S100, the recording range of the bitmap is rectangular, because most of the numerical control machine movements are synthesized by the translational motions of the three axes of X, Y, and Z, and the range of motion is also rectangular. The recording range of the bitmap is initially selected as the minimum machining range of the machine. Of course, the initial recording range of the bitmap can be adjusted according to the specific conditions of the workpiece to be machined.

There are two implementations of step S200, and the first implementation of step S200 is:

Each time a tool machining track point is acquired, it is determined whether the abscissa of the tool machining track point is within the abscissa range of the bitmap recording range, and whether the ordinate of the tool machining track point is within the ordinate range of the bitmap recording range. If all are, the tool processing track point is within the recording range of the bitmap. If one is not, the tool processing track point is outside the recording range of the bitmap.

In the first embodiment, since each time a new tool track point is acquired, the system immediately determines whether it is within the recording range of the bitmap, so that the system can know in time whether the newly acquired tool processing track point is in the bitmap. Within the scope of the record, but at the same time the computing burden of the system will be relatively heavy.

The second implementation of step S200 is:

S210 establishes a pre-storage queue, and each time a new tool processing track point is acquired, the new tool processing track point is put into the pre-storage queue;

Each time S220 acquires N new tool processing track points, the N new tool processing track points are connected into a broken line according to the time sequence of joining the pre-storage queue.

S230: establishing a first rectangle that just covers the N processing track points, determining whether the abscissas of the two diagonal vertices of the first rectangle are all within the abscissa range of the bitmap recording range, and the first rectangle Whether the ordinates of the diagonal vertices are all within the ordinate range of the bitmap recording range, and if they are all, the N processing trajectory points are within the recording range of the bitmap, and if one is absent, the N The machining track points are outside the recording range of the bitmap.

With the second embodiment, the system determines whether the new tool processing track points are within the recording range of the bitmap after acquiring a certain number of new tool processing track points, although the system cannot know the new time as in the first embodiment. Whether the obtained tool processing track point is within the recording range of the bitmap, but if the value of N is controlled within a certain range, it is not only timely determined whether the newly acquired tool processing track points are within the recording range of the bitmap, It can also greatly reduce the computational burden of the system. The value of N is generally in the range of 10 to 100.

In the second embodiment, the step of establishing a first rectangle that covers the N processing track points specifically includes: finding a minimum horizontal coordinate value, a minimum vertical coordinate value, a maximum horizontal coordinate value, and a maximum ordinate value, a first diagonal vertice is established according to a minimum horizontal coordinate value and a minimum ordinate value, and a second diagonal vertice is established according to the maximum horizontal coordinate value and the maximum ordinate value, according to the first diagonal vertices The second diagonal vertex depicts a first rectangle.

Step S400 includes two embodiments. The first embodiment is to adjust the center point of the recording range of the bitmap. If the first embodiment fails to meet the requirements, the size of the recording area of the bitmap is further adjusted.

Specifically, the first embodiment of step 400 is specifically: establishing a second rectangle that just covers the acquired tool processing track point, and shifting the center point of the bitmap recording range to coincide with the center point of the second rectangle.

The specific way of "establishing a second rectangle that just covers the acquired tool processing track point" is to find out the minimum horizontal coordinate value, the minimum vertical coordinate value, the maximum horizontal coordinate value and the maximum vertical coordinate value of the acquired tool processing track point, according to The minimum abscissa value and the smallest ordinate value establish a first diagonal vertice, and the second diagonal vertices are established according to the maximum abscissa value and the maximum ordinate value, according to the first diagonal vertices and the second diagonal The vertex draws the second rectangle.

Correspondingly, the specific way of "acquiring the center point of the second rectangle" is: according to the sum of the sum of the abscissas of the first diagonal vertices and the second diagonal vertices, and the first diagonal vertices and the second diagonal vertices The half of the sum of the ordinates determines the abscissa and the ordinate of the center point of the second rectangle, respectively.

A second embodiment of step 400 is that scaling K will enlarge the recording range area of the bitmap. The ratio K ranges from 1.5 to 2.5, typically 2. Specifically, the abscissa and the ordinate of the first diagonal vertices of the in-situ map recording range are respectively expanded by 2 times, and a new first diagonal vertice is established, and the second diagonal vertices of the in-situ map are recorded. The abscissa and the ordinate are respectively expanded by 2 times, a new second diagonal vertex is established, and a new bitmap recording range is established according to the third rectangle determined by the new first diagonal vertex and the new second diagonal vertex.

As the workpiece processing progresses, if the subsequently acquired processing trajectory falls outside the new bitmap recording range, the first embodiment and the second embodiment of step 400 are repeatedly performed in order.

The method for recording a processing trajectory by using a bitmap provided by the embodiment provides a bitmap recording range with a smaller coverage area than the prior art in which the recording range of the bitmap is always the maximum motion range of the machine tool. Then, during the machining of the workpiece, the recording range of the bitmap is continuously adjusted so that the recording range of the bitmap matches the coverage of the entire tool processing trajectory as much as possible, so that the entire machining trajectory is recorded and the bitmap is improved under the same storage amount. Resolution.

The embodiment of the present invention further provides a numerical control device 30 for controlling the operation of the numerical control machine tool. The numerical control device 30 includes at least a processor 310 and a memory 320. The processor 310 and the memory 320 can be connected through the bus 330. The processor 310 can be used to perform the method for recording the processing trajectory by using the bitmap described in the foregoing embodiment. For details of the related method, reference may be made to the description of the foregoing embodiment, and details are not described herein again.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims (11)

1. A method for recording a processing track by using a bitmap, comprising the steps of:

   Obtain the recording range of the bitmap and the tool processing track point;

   Determining whether the acquired tool processing track point is within the recording range of the bitmap;

   If the acquired tool processing track point is within the recording range of the bitmap, the tool processing track point is continuously acquired;

   If the acquired tool machining trajectory point is not within the recording range of the bitmap, the recording range of the bitmap is adjusted such that the acquired tool processing trajectory point is within the recording range of the bitmap.
2. A method of recording a processing trajectory using a bitmap according to claim 1, wherein

   The shape of the bitmap recording range is a rectangle.
3. The method of recording a processing track by using a bitmap according to claim 2, wherein the step of determining whether the processing track point is within a recording range of the bitmap comprises:

   Each time a tool machining track point is acquired, it is determined whether the abscissa of the tool machining track point is within the abscissa range of the bitmap recording range, and whether the ordinate of the tool machining track point is within the ordinate range of the bitmap recording range. If all are, the tool processing track point is within the recording range of the bitmap. If one is not, the tool processing track point is outside the recording range of the bitmap.
4. The method of recording a processing track by using a bitmap according to claim 2, wherein the step of determining whether the processing track point is within a recording range of the bitmap comprises:

   Establishing a pre-storage queue, each time acquiring a new tool processing track point, placing the new tool processing track point into a pre-storage queue;

   Each time N new tool machining track points are acquired, the N new tool machining track points are connected into a fold line according to the time sequence of joining the pre-stored queue;

   Establishing a first rectangle that just covers the N processing track points, determining whether the abscissas of the two diagonal vertices of the first rectangle are all within the abscissa range of the bitmap recording range, and determining the first rectangle Whether the ordinates of the diagonal vertices are all within the ordinate range of the bitmap recording range, and if they are all, the N processing trajectory points are within the recording range of the bitmap, and if one is absent, the N The machining track points are outside the recording range of the bitmap.
5. The method of recording a processing track by using a bitmap according to claim 4, wherein the step of establishing a first rectangle that just covers the N processing track points comprises:

   Finding a minimum abscissa value, a minimum ordinate value, a maximum abscissa value, and a maximum ordinate value of the N tool machining trajectory points, and establishing a first diagonal vertices according to the minimum abscissa value and the minimum ordinate value, A second diagonal vertex is established according to the maximum abscissa value and the maximum ordinate value, and the first rectangle is drawn according to the first diagonal vertex and the second diagonal vertex.
6. A method of recording a processing trajectory using a bitmap according to claim 4, wherein said N has a range of 10 to 100.
7. A method of recording a processing trajectory using a bitmap according to claim 1, wherein said step of adjusting a recording range of said bitmap so that the acquired tool processing trajectory point is within a recording range of said bitmap include:

   A second rectangle is formed that just covers the acquired tool machining track point, and the recording range center point of the bitmap is translated to coincide with the center point of the second rectangle.
8. The method of recording a processing trajectory by using a bitmap according to claim 7, wherein the step of translating a recording range center point of the bitmap to coincide with a center point of the second rectangle further comprises: Proportioning K will enlarge the area of the recording range of the bitmap.
9. A method of recording a processing trajectory using a bitmap according to claim 8, wherein said ratio K ranges from 1.5 to 2.5.
10. A method of recording a processing trajectory using a bitmap according to claim 1, wherein The initial value of the bitmap recording range is the minimum processing range of the machine tool.
11. A numerical control apparatus, characterized in that the numerical control apparatus comprises a processor and a memory, the processor for performing the method of recording a processing track with a bitmap as claimed in any one of claims 1-10.