CN117444670A - Method for establishing machining coordinate system of one-side two-pin positioning fixture - Google Patents

Abstract

The invention relates to a method for establishing a machining coordinate system of a one-face two-pin positioning fixture, which aims at automatically establishing the machining coordinate system for the one-face two-pin positioning fixture and automatically inputting the machining coordinate system in parallel, and can realize error prevention in a parameter input stage, so that an operator does not need to carry out related works such as fixture straightening and aligning, and does not need to carry out related works such as identification, recording, calculation, input and the like of origin coordinate data, and the clamp or workpiece machining coordinate system is established only by a fixture data point acquisition mode through an in-machine logic code, an origin, an angular algorithm and an in-machine automatic input mode. The method is simple, feasible, convenient and reliable, and is suitable for workshop pushing.

Description

Method for establishing machining coordinate system of one-side two-pin positioning fixture

Technical Field

The invention relates to a method for establishing a machining coordinate system of a one-face two-pin positioning fixture, and belongs to the technical field of numerical control machining.

Background

Before the numerical control machining center processes the workpiece, the fixture or the workpiece must be straightened and aligned, and the machining coordinate system is established by inputting relevant data after alignment. For a two-pin positioning clamp, an operator is required to continuously strike the clamp for alignment by alignment of the clamp, then the two steps are continuously repeated by using a lever meter (other alignment tools can be replaced), the two pins (pin holes) of the clamp are struck to be in a horizontal or vertical state (the difference between the two pins (pin holes) after alignment is usually not more than 0.01), the centers of the two pins (pin holes) are aligned by using the lever meter, after recording and calculating, the original point coordinates after alignment are input into a processing coordinate system corresponding to numerical control program codes according to the processing coordinate system marks of parts in a numerical control program, and alignment of the clamp is completed. The method has the defects that: 1. the alignment work of the fixture requires operators to probe the body into the machining center equipment, the fixture is continuously knocked, then a lever gauge (other alignment tools can be replaced) is used for alignment by straightening, the two steps are continuously repeated, the two pins (pin holes) are knocked to be in a horizontal or vertical state (the difference between the two pins (pin holes) after the alignment is usually not more than 0.01), then the centers of the two pins (pin holes) are aligned by using the lever gauge, and coordinate values of the centers of the two pins (pin holes) are recorded respectively. The alignment of the jig will take a lot of time and effort from the operator, and the increase in the production preparation time ratio will also result in a significant decrease in the effective utilization of the equipment. 2. After the alignment of the fixture is completed, an operator is required to record and calculate the original point coordinates of the fixture or the workpiece, the coordinates are manually input into a machining coordinate system corresponding to a numerical control program code according to the machining coordinate system marks of the part in the numerical control program, and if the operator identifies the original point coordinates, records errors, calculates errors, inputs errors or inputs the original point coordinates into the wrong machining coordinate system (because the machining coordinate system of the FANUC system is not arranged in sequence, the operator is very easy to input errors), the fixture, the workpiece and the collision machine risk exists at the moment.

Disclosure of Invention

The invention provides a method for establishing a machining coordinate system of a one-face two-pin positioning clamp, which aims to automatically establish the machining coordinate system for the one-face two-pin positioning clamp and automatically input the machining coordinate system in a parallel machine, and can realize error proofing in a parameter input stage, so that an operator does not need to perform related works such as clamp straightening and aligning, and the like, does not need to perform related works such as identification, recording, calculation, input and the like of origin coordinate data, and can realize the establishment of the machining coordinate system of the clamp or a workpiece only by a clamp data point acquisition mode and an in-machine logic code, origin, an angular algorithm and an in-machine automatic input mode.

The method is realized through the following steps:

the method for establishing the machining coordinate system of the one-side two-pin positioning clamp comprises the following steps of:

step one, mounting a clamp:

an operator installs a two-pin positioning fixture on a workbench of a numerical control machining center;

step two, automatically establishing M codes corresponding to a machining coordinate system in the operation machining center machine:

operating M1000 in an automatic operation mode of the machine tool, defining input parameters, and calling a program module which is fixedly stored in the machine tool in advance and automatically establishes a machining coordinate system of the one-side two-pin positioning fixture;

step three, collecting clamp data points:

after a feedback pause signal of the machine tool is obtained, changing an automatic operation mode into a hand wheel mode, and collecting two data collection points of a two-pin positioning clamp on one surface one by one;

if the acquisition process is interrupted, the M1000 instruction is recalled, and the corresponding parameter of #2 is modified, so that the follow-up data point acquisition is continuously completed from the intermediate position;

step four, finishing the establishment of a processing coordinate system:

after all the data points to be collected are completed, automatically calculating original point coordinates and angular parameters in a machine tool, inputting the original point coordinates and the angular parameters into a processing coordinate system defined by a user and common variables of the machine tool, and completing the establishment of the processing coordinate system;

step five, adding a fixed processing program initial template:

at this time, the original point coordinates of the machining coordinate system are stored in the machining coordinate system corresponding to the numerical control machining program, the rotation angle of the coordinate system is stored in the common variable #500, and in the subsequent numerical control machining center program, only the fixed machining program initial template G68X0.Y0.R#500 is required to be added; "can be used.

The method has extremely strong universality and can be suitable for all FANUC 0i versions and higher numerical control machining centers (other numerical control machining center systems can be replaced after parameters are changed).

The method adopts various structure data error prevention thought and original data registration error prevention thought, and comprises the following steps:

first kind prevents mistake thinking: and calling a preset M code to automatically establish a processing coordinate system program module of a preset two-pin positioning fixture on one side, wherein the two-pin positioning fixture on one side acquires parameter input processes such as point serial numbers, coordinate system labels, mode selection (origin algorithm) and the like, and if the parameter input is wrong or exceeds a set range, reporting alarm errors (MC 3001, MC3002, MC3003 and the like).

The second error prevention idea: the method comprises the steps that a program module of an automatic machining coordinate system is fixedly stored in a machine tool in advance, origin positioning modes and algorithm logics of different categories are distinguished through parameters and jump line numbers, after a feedback pause signal of the machine tool is obtained, an automatic operation mode is changed into a hand wheel mode, one-side two-pin positioning clamp data points are collected one by one, the current collection point serial number can be monitored through H1 cutter height compensation abrasion in the collection process, and the error of the sequence of point data collected by an operator is prevented; when the number of the acquired points exceeds the specified number, the automatic jump is realized, the multi-point data acquisition is avoided, and the useless information is stored in the common variable of the machine tool.

Third error prevention idea: the algorithm logic expression for calculating the original point coordinates and the angular parameters in the one-side two-pin positioning fixture machine is filled by using fixed public variable information data, and an automatic input program module in a machining coordinate system machine is adopted, so that operators do not need to recognize, record, calculate and input. The risk factors existing in manual operation and sudden abnormality (equipment outage) are avoided in the process of establishing a processing coordinate system origin and angular data input of the clamp or the workpiece. Original data registering error preventing thought: in the second error prevention idea, H1 cutter height compensation abrasion is used for monitoring the serial number of the current acquisition point, if data is input in the process of inputting the processing coordinate data, an alarm is given to the inside of a program, original data of the H1 cutter height compensation abrasion is returned before the alarm information prompts, or the original data of the H1 cutter height compensation abrasion is returned after the processing coordinate data is calculated and input is finished and before the program feeds back the completion information of the workpiece processing coordinate system establishment, so that the H1 cutter height compensation abrasion is prevented from being changed due to the monitoring of the serial number of the acquisition point, and the phenomena of clamp, workpiece scrapping and collision caused by the H1 cutter height compensation error are avoided.

The method has the beneficial effects that: the method adopts the preset M code to call the automatic machining coordinate system program module which is fixedly stored in the machine tool in advance, M code call information is written in the numerical control system parameter #6080 of the machining center, and the automatic machining coordinate system program module which is fixedly stored in advance is protected by writing in the numerical control system parameter #3202#4 of the machining center, so that the program module cannot be changed by operators, and the running stability of the follow-up functions is ensured. When the function is needed, only the M1000 code is required to be called and corresponding parameters are required to be macro-input, the hand wheel mode is used for completing data point acquisition, the establishment of a machining coordinate system of the one-face two-pin positioning clamp can be realized, the complicated work piece straightening and alignment work is not required to be carried out by an operator, the input of original point and angle data is not required to be carried out by the operator, the machining program of parts is not required to be changed by the operator, and the method is simple, easy, convenient and reliable and suitable for workshop pushing.

Drawings

FIG. 1 is a schematic view of a two-pin positioning fixture

FIG. 2 is a flow chart of the invention for automatically establishing a machining coordinate system for a two-pin positioning fixture

Detailed Description

The technical scheme of the invention is further described in detail below with reference to the attached drawings and examples:

referring to fig. 1 and 2, the method for automatically establishing a machining coordinate system by using the one-face two-pin positioning fixture takes FANUC numerical control as an example, and the method comprises the following steps:

step one, mounting a clamp:

an operator installs one-side two-pin positioning clamps on a workbench of a numerical control machining center at will, but attention is paid to the fact that the installation position of the clamps or workpieces cannot exceed a machining area corresponding to the stroke of the workbench; step two, using M codes and parameter input call to automatically establish a processing coordinate system program module:

in an automatic operation mode, using M1000 to call a program module (O9020) for automatically establishing a machining coordinate system, which is fixedly stored in advance, and simultaneously carrying out macro input of corresponding parameters of #1 to #3, #7 and #8 (A\B\C\D\E), and after the machining coordinate system is automatically established by one-side two-pin positioning fixtures, carrying out program alarm '3000 COMPLETE ESTABLISHMENT', and prompting that the establishment of the machining coordinate system of the one-side two-pin positioning fixtures is completed;

in the following description, "; "following program interpretation section

% O0001; M1000A 1B 1C 54D 0E 0; the machining coordinate system program module O9020 is called, and for #1 (corresponding row numbers of the machining coordinate system module are automatically built by selecting one-side two-pin positioning fixtures), #2 (the starting sequence number of the acquisition point is set), #3 (the reference of the machining coordinate system of the numerical control machining program), and #7 (the axis connecting line of the two pins (pin holes) takes an angle which is a positive value anticlockwise, and is usually defaulted to 0 DEG, 90 DEG or-90 DEG), and #8 (the original point position of the machining coordinate system, when # 8=0, the original point of the machining coordinate system is the center of the two pins (pin holes), and when # 8=1, the original point of the machining coordinate system is the center of the pin (pin hole) corresponding to the first acquisition point). And (3) injection: when #7, #8 defaults to 0, no input may be made to these two parameters. Examples: m1000 A1B 1C 54; # 3000=0 (COMPLETE ESTABLISHMENT); the LCD screen of the machining center displays alarm numbers and alarm information: the "3000COMPLETE ESTABLISHMENT" alarm prompts that the establishment of the machining coordinate system has been completed. M30; and (3) operating a two-pin positioning clamp to automatically establish a processing coordinate system program module: when the numerical control machining center starts to operate in an automatic operation mode, a machining coordinate system program module is automatically built, the machine tool does not move in any substantial coordinate axes, after the numerical control machining center finishes logic judgment of data reading and writing and early parameter input, the machine tool feeds back a pause signal for the first time, prompts an operator to check the sequence number of the current acquisition point stored in the H1 cutter height compensation abrasion, feeds back the pause signal for the second time after the machine tool is started again, at the moment, the operator changes the automatic operation mode into a hand wheel mode state, and acquires two data acquisition points of one-side two-pin positioning fixtures one by one (if the acquisition process is interrupted, the M1000 code can be called again, and the #2 corresponding parameter is modified), so that the follow-up data acquisition work is continuously finished from the middle position is realized. After the operator finishes all the data points to be collected, the original point coordinates and the angular parameters are automatically calculated in the machine tool, and are input into a processing coordinate system defined by a user and a system public variable, so that the establishment of the processing coordinate system is finished. At this time, the run program section returns to the main program and issues a program alarm "3000COMPLETE ESTABLISHMENT" indicating that the establishment of the one-side two-pin positioning jig processing coordinate system has been completed. (";" post Chinese small word is program interpretation section)% O9020 (ESTABLISH WORKPIECE COORDINATE SYSTEM); and (5) establishing a one-side two-pin positioning fixture and automatically establishing a processing coordinate system program module. # 800= #2001 (SAVE H1 HEIGHT COMPENSATION VALUE); the tool height compensation wear H1 is stored in the common variable # 800. # 2001= #2 (SERIAL NUMBER OF ACQUISITION POINTS); the initial serial number of the acquisition point position is stored in the cutter height compensation abrasion H1, so that an operator can check the acquisition point position conveniently. # 900=900 (ACQUISITION POINTS STORAGE START VARIABLE); the index 900 of #900 is stored in the common variable #900 for defining the acquisition point storage start variable index. # 900= [ #900+ [ #2-1] x 2] ] (THE CURRENT ACQUISITION POINTS STORES THE STARTING VARIABLE); the data stored in the common variable #900 is modified according to #2 (acquisition point start sequence number) to define the current acquisition point storage variable index. # 5201=0 (EXTERNAL WORKPIECE ORIGIN X OFFSET); the X-axis offset of the origin of the external workpiece is zeroed. # 5202=0 (EXTERNAL WORKPIECE ORIGIN Y OFFSET); the external workpiece origin Y-axis offset is zeroed. GOTO #1 (CHOICE MODE); and jumping to one side of the two-pin positioning fixture to automatically establish a corresponding line number of the machining coordinate system. M30; n1 (TWO PIN HOLES); one side of the two pin positioning fixtures corresponds to the row number. # 801=2 (NUMBER OF ACQUISITION POINTS); the data point bit number information actually required to be acquired is stored in the common variable # 801. IF [ #2LE0] GOTO10; IF [ #2GT# #801] GOTO10; and judging whether the parameter #2 (acquisition point position starting sequence number) exceeds a set range or not, and judging whether to jump to alarm information or not. IF [ #3le52] got 11; IF [ #3GT59] GOTO11; whether the parameter #3 (set processing coordinate system label) exceeds the set range is judged, and whether the alarm information is jumped is judged. IF [ #8LT0] GOTO12; IF [ #8GT2] GOTO12; and judging whether the parameter #8 (the original point position of the processing coordinate system is set) exceeds a set range or not, and judging whether to jump to alarm information or not. M00 (PLEASE CHECK THE ACQUISITION POINTS SERIAL NUMBER FROM H1); the operator is prompted to check the current acquisition point number stored in the H1 tool height compensation wear. M00 (MANUAL ACQUISITION OF COORDINATE POINTS); and prompting an operator to acquire the point location coordinates in a manual mode. # #900+1] = #5021; the current machine coordinate X data value is written into the current acquisition point storage variable. # #900+2] = #5022; and writing the current mechanical coordinate Y data value into the current acquisition point storage variable. # 900= #900+2; # 2001= #2001+1; the collection points store variable labels and collection point sequence number independent variables are overlapped. IF [ #2001LE#801] GOTO1; judging whether the point number required to be acquired is acquired or not. # 850= [ [ [ #904] - [ #902] ]/[ [ #903] - [ #901] ] (slape); the slope corresponding to the current clamping state of the two pins (pin holes) is calculated and stored in the common variable # 850. IF [ #8EQ0] GOTO100; IF [ #8EQ1] GOTO101; and jumping to corresponding row numbers of different types of origin logic algorithms of the machining coordinate system of the two-pin positioning fixture. GOTO12; n100; # 851= [ [ #901+#903]/2] (COORDINATE SYSTEM ORIGIN X COORDINATE); the processing coordinate system origin coordinate X value is calculated and stored in the common variable # 851. # 852= [ [ #902+ #904]/2] (COORDINATE SYSTEM ORIGIN Y COORDINATE); the machining coordinate system origin coordinate Y value is calculated and stored in the common variable # 852. GOTO102; n101; # 851= #901 (COORDINATE SYSTEM ORIGIN X COORDINATE); the processing coordinate system origin coordinate X value is calculated and stored in the common variable # 851. # 852= #902 (COORDINATE SYSTEM ORIGIN Y COORDINATE); the machining coordinate system origin coordinate Y value is calculated and stored in the common variable # 852. N102; # 500=atan [ #850] - #7 (COORDINATE SYSTEM ROTATION ANGLE); the workpiece processing coordinate system rotation angle is calculated and stored in the common variable # 500. # 5221 [ #3-54] 20] ] = #851 (WORKPIECE COORDINATE SYSTEM SETTING X ORIGIN); the workpiece processing coordinate system sets the X origin. # [5222+ [ #3-54] ×20] ] = #852 (WORKPIECE COORDINATE SYSTEM SETTING Y ORIGIN); the workpiece processing coordinate system sets the Y origin. # 2001= #800 (RETURN H1 HEIGHT COMPENSATION VALUE); returning to the initial value of H1 height compensation abrasion. M99; n10; # 2001= #800 (RETURN H1 HEIGHT COMPENSATION VALUE); returning to the initial value of H1 height compensation abrasion. # 3000=1 (ERROR OF STARTING NUMBER); the LCD screen of the machining center displays alarm numbers and alarm information: an alarm of 3001ERROR OF STARTING NUMBER prompts that the initial serial number of the acquisition point is wrong. N11; # 2001= #800 (RETURN H1 HEIGHT COMPENSATION VALUE); returning to the initial value of H1 height compensation abrasion. # 3000=2 (ERROR OF WORKPIECE SYSTEM); the LCD screen of the machining center displays alarm numbers and alarm information: an alarm of "3002ERROR OF WORKPIECE SYSTEM" indicates that the machining coordinate system is wrong in marking. N12; # 2001= #800 (RETURN H1 HEIGHT COMPENSATION VALUE); returning to the initial value of H1 height compensation abrasion. # 3000=3 (ERROR OF ORIGIN COORDINATE); the LCD screen of the machining center displays alarm numbers and alarm information: an alarm of 3003ERROR OF ORIGIN COORDINATE indicates that the original point position parameter of the processing coordinate system is wrong. The original point coordinates of the machining coordinate system are stored in the machining coordinate system corresponding to the numerical control machining program, the rotation angle of the coordinate system is stored in the common variable #500, and in the subsequent machining program, only the fixed machining template G68X0.Y0.R#500 is required to be added; and (3) obtaining the product. Examples: % O0001; T1M6 (DIA 50.0 FACE ENDMILL); G0G90G80G69G49G40G54S1500M3; g68x0.y0.r#500; (only a G68 instruction module is added at the program starting end, and the rest numerical control machining programs do not need to be modified at all) G43H1Z100.M8; … … … … M98P8000; m30; percent of the total weight of the composition.

Claims (1)

1. A method for establishing a machining coordinate system of a one-side two-pin positioning fixture is characterized by comprising the following steps: the method comprises the following steps:

step one, mounting a clamp:

an operator installs a two-pin positioning fixture on a workbench of a numerical control machining center;

step two, automatically establishing M codes corresponding to a machining coordinate system in the operation machining center machine:

operating M1000 in an automatic operation mode of the machine tool, defining input parameters, and calling a program module which is fixedly stored in the machine tool in advance and automatically establishes a machining coordinate system of the one-side two-pin positioning fixture;

step three, collecting clamp data points:

after a feedback pause signal of the machine tool is obtained, changing an automatic operation mode into a hand wheel mode, and collecting two data collection points of a two-pin positioning clamp on one surface one by one;

if the acquisition process is interrupted, the M1000 instruction is recalled, and the corresponding parameter of #2 is modified, so that the follow-up data point acquisition is continuously completed from the intermediate position;

step four, finishing the establishment of a processing coordinate system:

after all the data points to be collected are completed, automatically calculating original point coordinates and angular parameters in a machine tool, inputting the original point coordinates and the angular parameters into a processing coordinate system defined by a user and common variables of the machine tool, and completing the establishment of the processing coordinate system;

step five, adding a fixed processing program initial template:

at this time, the original point coordinates of the machining coordinate system are stored in the machining coordinate system corresponding to the numerical control machining program, the rotation angle of the coordinate system is stored in the common variable #500, and in the subsequent numerical control machining center program, only the fixed machining program initial template G68X0.Y0.R#500 is required to be added; "can be used.