JPS6299053A - Imposition control in machine tool - Google Patents

Abstract

PURPOSE:To carry out the working in high quality without necessitating skilfulness by providing the memory into which an imposition width table is accommodated, thus carrying out the imposition control in the form suitable for a used tool automatically, correctly, and certainly. CONSTITUTION:When each shift direction of the shift instruction in execution at present and the shift instruction to be executed next is different, the imposition width W1 at present is read from a tool data memory 3, and the imposition width W1' to be controlled actually is calculated from the imposition width rank shift RS and the imposition width rank RK which are instructed by a working program PRO, in an imposition control part 10, and it is judged in a shaft control part 16 if the left instruction pulse quantity of the shift instruction in execution is less than W1' or not, in other words, if the distance between an aimed shift point P1 and the position of the tool at present is less than W1' or not, and if the judgement is 'YES', the next shift instruction is outputted for each driving motor 17, and the direction change to the next shift direction is performed, continuing the shift operation according to the shift instruction in execution immediately before, and working is continued, following the locus PS2 of the tool.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a method for controlling in-position in a machining process in which the in-position width can be changed for each tool.

(b), conventional technology FIG. 7 shows an example of in-position control.

Normally, in a machine program, if the movement direction of the currently executed movement command and the next movement command are different, the movement command currently being executed is completely executed, that is, the tool is completely directed to the command. When executing the next movement command after confirming (stopping the tool) that the tool has reached the specified position (for example, point PI shown in Fig. 7), the tool path Psi in that case is shown in Fig. 7. Immediately before the currently executed movement command is completely executed, that is, immediately before the tool is completely directed by the command and reaches the t position, the next movement command is executed (in that case, Set the tool path PS2 to the 7th
(as indicated by the arrow in the figure).

The former is a case where an in-position check (abbreviated and usually referred to as an "in-position check".Hereafter, when referred to as an "in-position check", it means an in-position check) is performed, and the latter is a case where an in-position check is performed. This is the case when the above is not carried out.

When I performed an imposite check, the machining accuracy was just that! However, the time required for processing increases. On the other hand, if the imposite check is not performed, the machining accuracy will deteriorate accordingly, but the machining time will be shortened.

Previously, the operator (programmer) had to make all the decisions as to whether or not to perform this imposity check.

(C) 0 Problems to be solved by the invention However, for which tools should the imposite check be performed?
Deciding whether or not to do so was a task that required a high degree of skill.

In addition, the imposition width Wl shown in Fig. 7, that is, the unexecuted portion of the number of pulses instructed to move by the currently executed command, when the next command is executed is determined by the craftsmanship. Only one type can be set on the machine side, regardless of the tool used.
Therefore, it is difficult to set the in-position width according to the type and diameter of the tool, and it is not possible to perform in-position control in a manner suitable for each tool used.

In order to eliminate the above-mentioned drawbacks, the present invention provides an in-position control method for a machine tool that allows in-position control with different in-position widths for each tool without the operator (programmer) being aware of it. The purpose is to provide the following.

(d) Means for solving the zero problem, that is, the present invention provides an impo width table (ITL) showing the impo width (W I ) of the tool used for processing.
), and when the movement directions indicated by the first and second movement commands that are executed consecutively are different between the movement commands, the current data is stored from the memory (3). The impost width (Wl) of the tool in use is read out, and the distance to the movement target position (Pl) specified by the first movement command of the tool is determined by the read imposition width (Wl).
The second movement command is executed when the distance becomes shorter than the distance corresponding to WI).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. The following r (el
The same applies to the column ``, action''.

(e) 0 effect With the above-described configuration, the present invention can store the impossible width (W) of the tool in use from memory when the machining direction changes.
I ) is read out, and the control of the impositivity width is performed based on the impositivity width (W I ) without going through an instruction of the imposition width (Wl) by an operator or the like.

(f), Example Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a control block diagram showing an example of a machine tool to which the in-position control method according to the present invention is applied, Fig. 2 is a flowchart showing an example of an in-position control program, and Fig. 3 is the contents of an in-position width table. 4 is a schematic diagram showing the contents of an imposture width rank table, FIG. 5 is a schematic diagram showing the contents of an imposture width rank shift table, and FIG. 6 is a diagram illustrating an example of a Kani program. .

The machine tool 11!1 has a main control section 2, and the main control section 2 includes a tool data memory 3, a machine program memory 5, a tool path generation m6, a display section 7 such as a display,
A keyboard 9, an imposition control unit 10, an execution buffer memory 11, etc. are connected. The impositivity control unit IO includes an impositivity width rank memory 12, an impositivity width rank shift memory 13, a control program memory 15, and an axis control unit 1.
6 is connected, and the axis control unit 16 includes an execution buffer memory 11 and a drive motor 17 that drives each axis of X1Y1Z.
etc. are connected.

Since the machine tool 1 has the above-described configuration, predetermined machining is performed based on the cannibal program PRO stored in the cannibal program memory 5. As shown in FIG. 6, at the beginning of the Kani program PRO there is an address position that instructs the imposity width rank shift R3 along with the material and material dimensions, and furthermore, the processing unit UNT is indicated and its Among them, a sequence SEQ is further instructed, which instructs the machining contents for each tool. That is, one processing unit UNT is
It is composed of one or more sequences SEQ. This sequence SEQ stores various data necessary for machining, including the impon width RK
There is an address location that indicates the.

Note that the methods for inputting automatic programs and subsequently creating tool paths are already known, and such numerically controlled machine tools are commercially available.
A detailed explanation of data processing and the like after the input is omitted.

During machining, the main control section 2 analyzes the cutting program PRO, causes the tool path generation section 6 to generate a tool path, and stores the result in the execution buffer memory 11 as movement data DATA. The axis control section 16 is
Machining operations are performed by driving and controlling each drive motor 17 based on the movement data DATA. At this time, the in-position control unit 10 reads out the in-position control program ICP from the control program memory 15 and performs the in-position control. Involution control is performed based on the program ICP.

That is, as shown in FIG.
If the movement direction of the movement command currently being executed and the movement command to be executed next are different from the movement data DATA stored in the tool data memory 3, step S2 is entered and the imposition width table ITL of the tool data memory 3 is searched. Then, the imposition width Wt regarding the tool currently used for machining is read out.

In addition, when determining the difference in machining direction, for example, the tool trajectory to the movement target position specified by the G code etc. in each movement command is calculated, and depending on whether the expressions match,
There are several possible methods for determining this.

In addition, as shown in FIG. 3, the imposure width table ITL stores the imposure width Wl applied to each tool used in the machine tool 1, along with the tool name NAM and nominal diameter CAL, and Capital) Tool name used NA
If M and the nominal diameter CAL are known, the corresponding impository width Wl can be immediately read out.

When the impositivity width W1 is read out in step S2, the process goes to step S3, and the impositivity width Wl' to be actually controlled is calculated and determined from the impositivity width rank shift R3 and the impositivity width rank RK instructed in the Canadian program PRO. do. That is, 1, the impositivity control unit 10 searches the impositivity width rank table RTL stored in the insufficiency width rank memory 12, and searches the impositivity width rank RK specified by each sequence SEQ in the Canadian program PRO.
, the corresponding impositivity width ratio RT of the impositivity width rank table RTL is read out. This imposi width rank RK
is provided to more finely control the imposture width of each tool, and each sequence S
The impository width W+ can be independently set according to the specific processing content of the EQ. In addition, as shown in FIG. 4, the imposture width rank table RTL includes each imposture width rank RK (in the case of this embodiment, the ranks range from "1" to "1").
Since the imposition width ratio RT corresponding to 5 stages (up to 5) is shown, the sequence SE of the Canadian program PRO is shown.
When this impositivity width rank RK is specified in Q, the corresponding impositivity width ratio RT can be immediately read out from the impositivity width rank table RTL. In this way, the impositivity control section 10 multiplies the imposities width WI of the currently used tool read from the tool data memory 3 by the imposities width ratio RT to find the imposities width Wl' to be actually controlled.

At this time, if there is an instruction for imposity width rank shift R3 at the beginning of the Canadian program PRO, the imposity control unit 10 selects the specified imposity width rank shift table STL from the imposity width rank shift table STL of the imposity width rank shift memory 13. Read out the value of the width rank shift R3 (in the case of this embodiment, the shift value is in 5 steps from "-2" to "2"),
The corresponding shift number ST is determined, and the imposture width Wl' is calculated in consideration of the shift number ST. This shift number ST is
Impossible width rank RK shown in FIG.

Therefore, the impositivity width ratio RT is expressed as the shift number ST, t!
It has a function to rank up or rank down (rank up is the direction in which the number of impositivity width ranks RK increases, and rank down is the direction in which the number of impositivity width ranks RKO decreases). Nibrogram PRO
By instructing the impositivity width rank shift R3 at the beginning of
It is possible to rank up or rank down by a predetermined number of ranks (that is, find the impost width ratio RT where the imposture width rank RK is ranked up or rank down by the number of shifts ST, and calculate the ratio RT and the ratio shown in the imposture width table ITL. The impositivity width Wl'' to be controlled is obtained by multiplying the impositivity width W1 by 1M.).

In this way, in step S3, after calculating the impost width rank RK and the imposture width Wl' corresponding to the imposity width rank shift R3 instructed by the cannibal program PRO, the process proceeds to step S4, and the current execution Whether or not the number of remaining command pulses in the middle movement command is smaller than the imposture width W+' determined in step S3, that is, as shown in FIG. It is determined whether the distance between the point P1 and the current tool position is smaller than the imposture width Wl'. As a result, the number of remaining command pulses is determined in step S3.
If it is determined that the imposity width wI' is smaller than the imposity width wI' calculated in step 1, the process proceeds to step S5, where the axis control unit 16 outputs the next movement command to each drive motor 17, and As a result, the tool path PS2 changes direction toward the next movement direction while continuing the movement operation of the movement command that was executed immediately before, as shown by the arrow in Fig. 7, and continues machining. .

(gl) Effects of the Invention As explained above, according to the present invention, a memory such as the tool data memory 3 that stores the impositivity width table ITL indicating the impositivity width Wl of the tool used for machining is provided. However, if the movement directions indicated by the first and second movement commands that are executed consecutively are different between the movement commands, the imposture width W1 for the tool currently in use is read from the memory, and the tool When the distance to the movement target position, such as the point P specified by the first movement command, becomes shorter than the distance corresponding to the read impository width W+, execute the second movement command. Since it is configured in such a way, it is possible to control the impositivity check automatically and finely, in a tool-compatible manner, without bothering the operator (programmer), with a wide variety of imposit widths. It would be possible to have a machine tool perform processing without requiring any skill.

In addition, as shown in Fig. 3, the impositivity width Wt corresponding to the tool shown in the impositivity width table TTL is specified as "0" in the case of a tool such as a tap that always requires imposity check. Therefore, even if the operator (programmer) has no knowledge of the imposition width Wl, it is possible to accurately and accurately perform in-position control corresponding to the tool.

[Brief explanation of drawings]

Fig. 1 is a system block diagram showing an example of a machine tool to which the in-position control method according to the present invention is applied, Fig. 2 is a flowchart showing an example of an in-position control program, and Fig. 3 is a diagram of an in-position width table. Fig. 4 is a schematic diagram showing the contents of the impositivity width rank table; Fig. 5 is a schematic diagram showing the contents of the impositivity width rank shift)-table; Fig. 6 is a diagram showing an example of the Canadian program; FIG. 7 is a diagram showing an example of in-position control. 1...Machine tool 3...Memory (tool data memory) ITL
...Imposit width table Wl, Wl'...
・Imposit width P1...Point (movement target position) Applicant: Yamazaki Iron Works Co., Ltd. Figure 2

Claims (1)

[Scope of Claim] A machine tool having a tool that is moved and driven by a movement command, the machine tool having a memory storing an impo width table indicating the impo width of the tool used for machining, and a machine tool that is continuously executed. If the movement directions indicated by the first and second movement commands are different between the movement commands, read the imposture width for the tool currently in use from the memory and calculate the imposture width specified by the first movement command of the tool. An in-position control method for a machine tool configured to execute a second movement command when a distance to a movement target position becomes shorter than a distance corresponding to the read imposition width.