JPS60222904A - Control method of coordinate system conversion of numerically controlled lathe - Google Patents

Abstract

PURPOSE:To generate a work program efficiently in a short time by converting coordinates of respective size values in the work program inputted on the basis of a numeric origin, and driving and controlling a mechanism part. CONSTITUTION:An area for storing coordinate conversion commands is provided in a work program memory 7 and further a coordinate conversion constant memory 6 for storing the distance between numeric origins corresponding to a program origin as a conversion parameter is provided. When a coordinate system conversion command is stored in this memory 7, coordinates of respective size values in the work program inputted on the basis of the numeric origins are converted to size values based upon the program origin with the conversion parameter and the mechanism part 11 is driven and controlled on the basis of the converted size values.

Description

Detailed Description of the Invention (a) 0 Technical Field of the Invention The present invention relates to input of machining dimensions in a so-called second process, in which a workpiece is reversed and machined when an operator or the like inputs a cutting program in a numerically controlled lathe. The present invention relates to a coordinate system conversion control method that allows operations to be performed without requiring coordinate system conversion work by an operator.

(b), Background of the technology In recent numerically controlled lathes, a series of related machining processes is treated as one fixed cycle, and a machine program can be created simply by inputting the fixed cycle from a keyboard, etc. A so-called automatic program that can do this has been developed and put into practical use.

Although these automatic programs have made it possible for operators to create and input cannibal programs while referring to production drawings, there are still many points to be improved in these automatic programs.

(C), Prior Art and Problems Conventionally, when machining both sides of a material with this type of numerically controlled lathe, the machining part on the chuck side is blocked by the chuck or workpiece fixing jig, Machining is not possible unless it is reversed at this point. Therefore, when creating a Canadian program, the operator sets the program origin, which is the standard for program creation, at both ends of the workpiece, and for the part where the workpiece is reversed and machined, the program origin is opposite to the program origin before the workpiece is reversed. The machining dimensions for each part were entered based on the program origin on the side.

However, normally, the machining dimensions of the workpiece are set based on one reference plane SF, as shown in Figure 2.
In order to input the dimensions of the part to be machined by inverting the workpiece, based on the program origin PZPI at the left end of the diagram, the operator inputs the drawing dimensions a1 to a8 from the reference plane SF to the program. It is necessary to convert and input the dimensions based on the origin PZPI, which requires a lot of time and effort, and not only increases the time required to create the cannibal program, but also has the disadvantage that calculation errors are likely to occur.

(d) 0 Purpose of the Invention The present invention does not solve the above-mentioned drawbacks, but eliminates the need for the operator to perform complicated and time-consuming calculations when inputting a cannibal program, thereby allowing the creation of a cannibal program to be performed efficiently in a short time. The object of the present invention is to provide a method for controlling coordinate system transformation in a numerically controlled lathe that can be easily performed.

(e) 0 Configuration of the Invention That is, the present invention provides an area in the first memory for storing a coordinate transformation command that announces coordinate transformation, and also calculates the distance between the program origin and the corresponding numerical origin. If a second memory is provided to store transformation parameters, and a coordinate system transformation command is stored in the first memory,
Each dimension in the cannibal program input based on the numerical origin in response to a coordinate conversion command is coordinate-converted to a dimension based on the corresponding program origin using the conversion parameter, and based on the converted dimension. The mechanism is configured to drive and control the mechanical section.

(The following is a blank space) (f) 0 Examples of the Invention Examples of the present invention will now be described in detail based on the drawings.

Fig. 1 is a control block diagram showing an example of a numerically controlled lathe to which the coordinate system conversion control method according to the present invention is applied, Fig. 2 is a diagram showing an example of a manufacturing drawing of a workpiece, and Fig. 3 is a computer program memory. FIG. 4 is a diagram showing another example of a production drawing of a workpiece to which the present invention is applied.

As shown in FIG. 1, the numerically controlled lathe 1 has a main control section 2, and the main control section 2 is connected via a bus line 3 to a keyboard 5, a coordinate transformation constant memory 6, and a computer program. A memory 7, a coordinate value calculation section 9, a mechanism operation control section 10, etc. are connected. The 4'A structure movement control unit 10 includes a main shaft 12 and a turret 1.
A mechanism section 11 composed of three components is connected to a mechanism operation control section 10 so as to be freely controllable.

Since the numerically controlled lathe 1 has the above-described configuration, when creating the cannibal program PRO, the operator disassembles the machining to be executed into a plurality of fixed cycles while referring to the production drawing, and By inputting CYC from the keyboard 5, a Canadian program PRO is created in a program memory 7. At this time, the dimensions required for machining each canned cycle CYC are input for each canned cycle together with other machining information INF via the keyboard 5, and the input machining information INF is stored in the machine program memory 7. It will be stored as part of Nibrogram PRO.

Now, let's talk about the case where, for example, the outside diameter machining program P) (0) is created for the workpiece 15 shown in FIG. Processing is performed by chucking the left end of workpiece 15 in the figure, but on the left side of the A-A line, this time
Machining is performed by chucking the right end in the figure. Note that the dimensions of the workpiece 15 on the production drawing are entered based on the reference plane SF on the right side of the drawing, so when inputting the machine program P RO, the operator first selects the machining on the right side of A-A, %I. Dimensions a and a are input from the keyboard 5 as processing information INF. At this time, the operator sets the program origin PZP2 at the right end of the workpiece 15 and inputs dimensions a and a based on the program origin PZP2, so when inputting dimensions a and a2, the operator inputs the numerical values shown in the drawing as they are. However, there is no need to perform any calculations.

Next, the operator inputs the dimension a - a for machining on the left side of the A-A line from the keyboard 5 as machining information INF, but at this time, the operator enters the program origin PZ
Set PI at the left end of the workpiece 15, and set a new numerical origin N on the reference plane SF on the drawing as the dimensional origin.
ZP is set, and the distance between the newly set numerical origin NZP and the program origin PZPI corresponding to the numerical origin NZP is input as dimension a8. When the setting of the numerical origin NZP is instructed from the keyboard 5, as shown in FIG. The coordinate system conversion program unit PTU is stored (ordinarily, between the fixed cycle CYC and the coordinate system conversion program unit PTU, the workpiece 15 is
A reversal command for reversing is entered, but will be omitted here to simplify the explanation. ). This coordinate system conversion program unit PTU is provided with a coordinate system conversion flag storage area FA and a numerical origin coordinate storage area NZA that notify that the coordinate system has been converted. A flag '1' is stored to notify that the subsequent dimension data is based on the new coordinate system, and the numerical origin coordinate storage area NZA stores the newly set numerical origin NZP and the corresponding numerical origin. A dimension a8 indicating the distance from the program origin pzpi corresponding to NZP is stored.

In this way, when the setting of the new numerical origin NZP is completed and the coordinate system conversion program unit PTU is also stored in the cannibal program PRO in the cannibal program memory 7, the operator, while referring to the drawing, From there, the machining dimensions of the left part in Figure 2 are input based on the numerical origin NZP. At this time, the operator must set the program origin P.
Even if ZP2 is set to the left end in the diagram, the processing information INF
The dimensions to be input as ``dimensions'' may be those based on the numerical origin NZP, and therefore the reference plane SF shown in the drawing, so dimensions 83 to a8 can be input from the keyboard 5 without any calculations. .

When the input of dimensions a3 to aQ and other machining information INF from the keyboard 5 is completed, and the Canadian program PRO for the workpiece 15 is completed in the Canadian program memory 7, the operator starts machining via the keyboard 5. The command SC is output to the main control section 2. In response to this, the main control unit 2 reads out the cannibal program PRO stored in the cannibal program memory 7 for each fixed cycle cyc that constitutes the cannibal program PRO, and outputs it to the mechanism operation control unit 10. The mechanism operation control unit 10 calculates the tool path and other parameters during machining based on the machining information INF indicated in the fixed cycle CYC, and further drives the main shaft 12, tool rest 13, etc. of the mechanism unit 11 based on the results. It controls and executes the specified processing.

Machining is first performed to the right of line A-A in the figure by chucking the left end of the workpiece 15 in FIG. Since the dimensions a and a2 in the Nibragram PRO are set based on the program origin PZP2, the machining of the numerically controlled lathe 1, that is, the calculation of the tool path, is also performed based on the program origin PZP2, and the machining is executed smoothly. be done.

When the machining on the right side of the A-A line in the figure is completed, the main controller 2 reverses the workpiece 15 and executes the machining on the left side of the A-A line. Canada program PR
Read the coordinate system conversion program unit PTU from O. When this coordinate system conversion program origin l-PTU is read out, the main control unit 2 starts the coordinate value calculation unit 9, and also starts the coordinate system conversion program origin PTLI stored in the numerical origin coordinate storage area NZA in the coordinate system conversion program unit PTLI. , the distance a8 between the program origin PZPI and the numerical origin NZP is stored in the coordinate transformation constant memory 6 as a transformation parameter TPA.

By this coordinate system transformation program unit PT [J,
The main control unit 2 determines that the dimensions stored during each fixed cycle CYC of the subsequent Canadian program PRO are set at the program origin PZ.
Recognize that it is not based on PI, but on the numerical origin NZP.

Therefore, the main control unit 2 thereafter transfers the dimensions related to the Canadian program PRO that have been read out to the coordinate value calculation unit 9, and the coordinate value calculation unit 9 uses the transferred first dimension with respect to the program origin PZPI. Convert the coordinates to the dimensions given below. In this calculation, the coordinate value calculation section 9 reads out the conversion parameters TPA stored in the coordinate conversion constant memory 6, and calculates each dimension a3 to a8 based on the parameters at the program origin PZ.
By converting the PI to the standard dimensions,
The converted dimensions a'~, 8) (, , j are 0) are output to the mechanism operation control section 10. Mechanism operation control section 10
calculates and controls the tool path during machining using the coordinate-converted dimensions 113' to 8□', and then
5 is smoothly processed as shown in the drawing with the program origin PZPI as a reference.

In addition, although the above-mentioned embodiment described the case where only one reference surface SF was provided on the right end surface in FIG. 2, the present invention is not limited to one reference surface, and as shown in FIG. , first reference plane S
Of course, the present invention can also be applied to the case where two reference planes, FI and second reference plane SF2, are provided. In the case of B, first set the program origin PZI) 1, PZP2 at both ends of the workpiece 15, align the numerical origin with the reference planes SF1 and SFl, set the two locations NZPl and N2F2, and first set the program origin The distance b to the numerical origin NZPI based on PZPI is stored in the numerical origin coordinate storage area NZA of the first coordinate system conversion program unit PTU, and in that state, the dimensions b , , b are input, and then the program origin is The distance ab to the numerical origin NZP2 based on PZP2 is stored in the numerical origin coordinate storage area NZA of the second coordinate system conversion program unit P'ru, and in this state, the dimensions b4 to b7 are input. Note that the same applies even when the number of reference planes is three or more.

8 Effects of the Invention As explained above, according to the present invention, the coordinate system transformation program unit P T LJ etc. that notifies the coordinate transformation is stored in the first memory of the program memory 7 etc. In addition to providing an area for storing conversion commands, the distances a8, bl,
A second memory such as a coordinate transformation constant memory 6 is provided in which b3 is stored as a transformation parameter ゛r'PA, and when a coordinate system transformation command is stored in the first memory, the coordinate transformation command is Correspondingly, the numerical origins NZP, NZ
Canada program PR input based on PI, N2F2
The coordinates of each dimension in O are converted into dimensions based on the corresponding program origins PZPI and PZP2 using the conversion parameters, and the mechanism unit 11 is converted based on the converted dimensions.
Since the configuration is configured to drive and control the dimensions, the operator can change the dimensions entered in the drawing based on the reference planes SF, SFI, and SF2 into the conversion parameters regardless of where the program origins PZPI and PZP2 are set. Enter the numerical origin NZP.

By setting NZPI and N2F2, it is possible to input data exactly as shown in the drawing, which eliminates the complicated and time-consuming task of having the operator recalculate dimensions based on the program origin (7). It is no longer necessary to carry out tedious work, and a highly reliable cannibal program can be created in a short time.

In addition to storing the transformation parameters TPA in the coordinate transformation constant memory 6 as in this embodiment, the coordinate system transformation program unit P T tJ is stored each time the coordinate value calculation section 9 transforms each dimension. The program origin PZP shown in
It is also possible to configure the system to read the distance between I, PZP2 and the numerical origin NZP, NZPI, NZP2 and adopt that value as the conversion parameter TPA. It's practically the same thing. Furthermore, it goes without saying that the first memory and the second memory may be set in the same memory space.

[Brief explanation of drawings]

Fig. 1 is a control block diagram showing an example of a numerically controlled lathe to which the coordinate system conversion control method according to the present invention is applied, Fig. 2 is a diagram showing an example of a manufacturing drawing of a workpiece, and Fig. 3 is a computer program memory. FIG. 4 is a schematic diagram showing an example of a cannibal program stored in the computer, and FIG. 4 is a diagram showing another example of a manufacturing drawing of a workpiece to which the present invention is applied. 1... Numerical control lathe 6... Second memory (coordinate transformation constant memory) 7...
...First memory (Canadian program memory) 11...
... Mechanical parts a, b ... Dimensions a,, b, b ... Distance TPA ... Conversion parameters NZP, NZPI, NZP2 ... Numerical origin PZ
PI, PZP2...Program origin PTU...
- Coordinate system conversion command (coordinate system conversion program unit) Applicant Yamazaki Iron Works Co., Ltd. Agent Patent attorney Phase 1) Shinji (and 1 other person) Figure 1 To 13゛11 Figure 2 5 Figure 3 Figure 4

Claims (1)

[Claims] A first memory is provided with an area for storing a coordinate transformation command that announces coordinate transformation, and a second memory is provided in which the distance between the program origin and the corresponding numerical origin is stored as a transformation parameter. When a memory is provided and a coordinate system transformation command is stored in the first memory, each dimension in the Canadian program input based on the numerical origin in response to the coordinate transformation command is converted into the transformation parameter. A method for controlling coordinate system conversion in a numerically controlled lathe, comprising: converting coordinates into dimensions based on a corresponding program origin, and driving and controlling a mechanical part based on the converted dimensions.