CN108845804A

CN108845804A - A kind of design method of the NC code interpreter based on CYCLE circulation

Info

Publication number: CN108845804A
Application number: CN201711410879.7A
Authority: CN
Inventors: 宋荆洲; 付晓
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2017-12-23
Filing date: 2017-12-23
Publication date: 2018-11-20

Abstract

The present invention discloses a kind of design method of NC code interpreter based on CYCLE circulation, and for fields of numeric control technique, numerical control interpreter can check whether NC code is correct and provide for analogue system being capable of identified machine tool motion information.The invention proposes a kind of design methods of NC code interpreter based on CYCLE circulation, morphology and syntactic analysis are carried out to numerical control code by regular expression rule base, check the integrality of code and the reasonability of collocation, CYCLE recursion instruction is decomposed by numerical control elementary instruction by semantic module again, Tool in Cutting route is planned simultaneously, generates the machine tool motion information intermediate file that can be simulated software identification.Design method of the present invention compared with other numerical control interpreters, morphology with higher, syntactic analysis efficiency, while eliminating and parsing mistake caused by grammatical ambiguity, and complicated CYCLE recursion instruction can be decomposed into the simple intermediate file form of structure.

Description

A kind of design method of the NC code interpreter based on CYCLE circulation

Technical field

The invention belongs to fields of numeric control technique, in particular to a kind of NC code interpreter based on CYCLE circulation to set Meter method.

Background technique

In Numerical Control Machining Simulation, computer can not obtain machine tool motion information directly from numerical control program, it is necessary to have phase The module answered serves as the role of interpreter, and machine tool motion information is extracted from numerical control program, it is identifiable to be converted into computer Intermediate data structure, then computer drives the movement of machine tool component by reading intermediate data structure, to realize processing The progress of emulation.But from the point of view of numerical control NC both domestic and external explains decoding technique at present, parser is more complex and the text of definition Regulation is then complicated, and the intermediate data structure extracted is relatively simple, it is also necessary to which emulation module is further processed.

Although the design multiplicity of NC code interpretative device, its final purpose are provided to precheck from syntax rule The correctness of NC code and the intermediate data structure that can identify NC code conversion for computer, to carry out machining simulation.This Invention proposes a kind of design method of NC code interpreter based on CYCLE circulation, by utilizing designed canonical table Morphology and syntactic analysis are carried out up to formula rule base and complicated CYCLE recursion instruction is decomposed into numerical control elementary instruction, the syntax Simple in rule, Tool in Cutting intermediate data structure is reasonable, occupies little space.

Summary of the invention

The purpose of the present invention is to provide a kind of design methods of NC code interpreter based on CYCLE circulation, realize The high efficiency of NC code interpreter in Numerical Control Machining Simulation, avoids the ambiguity for explaining the syntax.The skill that the present invention uses Art scheme is：Regular expression rule base is constructed according to machining code coding line first；Then morphological analysis is carried out, according to reading Machining Instruction word rule searching library in code, analyzes the legitimacy and numerical limitations of character in NC code, analysis It is correct then carry out the syntactic analysis phase；Syntax Analysis Module reading output information from the output of Lexical Analysis Module checks journey Sequence, the integrality of program segment, and the legitimacy and integrality that each instruction is arranged in pairs or groups are checked using regular expression, correctly then carry out Semantic module；CYCLE recursion instruction is decomposed into numerical control elementary instruction by semantic module, and is determined by loop parameter Tool in Cutting route in processing generates the intermediate data structure that analogue system can identify.

Advantages of the present invention has：

The invention proposes a kind of design methods of NC code interpreter based on CYCLE recursion instruction.Using canonical Expression formula carries out morphological analysis and instruction collocation validity checking to the NC code recycled based on CYCLE, and grammar rule is simple, effect Rate is higher, while can avoid explaining the ambiguity of the syntax.The present invention plans Tool in Cutting track by semantic module, will CYCLE recursion instruction is decomposed into numerical control elementary instruction, and scalability is good, while the Tool in Cutting intermediate file structure letter generated List, memory space are small.

Detailed description of the invention

Fig. 1 is NC code interpreter overall execution flow chart of the invention

Fig. 2 is morphological analysis rule classification figure of the present invention

Fig. 3 is morphological analysis flow chart of the present invention

Fig. 4 is syntactic analysis flow chart of the present invention

Fig. 5 is the Path planning schematic diagram of one concrete example of the present invention

Fig. 6 is the outer profile roughing code map of a concrete example of the invention

Specific embodiment

To realize goal of the invention, technical solution and feature is more clearly understood, the present invention is made with reference to the accompanying drawing detailed It describes in detail bright：Attached drawing 1 is interpreter overall execution flow chart of the invention, and detailed process includes the morphological analysis of NC code, grammer point Analysis, semantic analysis, specific step is as follows：

1. morphological analysis

Regular expression rule base often is constructed with Machining Instruction according to turning, to rule classification such as Fig. 2.

Morphological analysis detailed process is as follows：

1) row of N C code is read, is directly stored into List if including CYCLE circulation, on the contrary it will by space It is divided into distinct program word, and stores into List.Such as N10G00G40X50Z50, it can be broken down into " N10 ", " G00 ", " G40 ", " X50 ", " Z50 " this five program words, and store into List.

2) for the program word decomposited, character is taken out one by one, first determines whether initial character in rule non-CYCLE circulation It whether there is in library, such as B10, B instruction is in rule base and is not present, therefore morphological analysis malfunctions.If deposited in rule base Then corresponding regular expression is handled in calling rule library, and having Corresponding matching, then the program word is correct, otherwise morphological analysis Error.3) postpositive disposal process.By program segment number, such as " N10 ", program segment is reconstructed and is stored into List1；If journey Existing in sequence section " CYCLE95 " then according to the subprogram segment title in its parameter inquires subprogram segment name when traversing List After title, program segment it will store into List2 thereafter.

2. syntactic analysis

Syntactic analysis is analyzed primarily directed to program segment, judge the output of morphological analysis whether can constitute one it is legal Program segment and entire program integrality.

The legitimacy and integrity checking main flow of program segment are as follows：

1) element in list1/list2 is read, whether judgement wherein includes " CYCLE ", if comprising skipping to 2, it is no Then skip to 3；

2) corresponding regular expression rule is transferred by number after CYCLE to be matched, having return value then indicates correct, Return to 1；Otherwise syntax error is exported.

3) do not include CYCLE at this time to recycle, then syntax check is from left to right carried out to program segment.It is same that G instruction is carried out first Group checks that if there is same group of instruction then exports syntax error, such as G01, the instruction such as G02 cannot occur simultaneously in same program section.

4) other instruction recheckings are carried out, such as：X instruction, Z instruction etc.

5) must there are X, Z, CR coding line or I, K instruction after carrying out integrity detection, such as G02 instruction for corresponding instruction Word indicates center location, the imperfect syntactic analysis error of ELSE instruction.

6) check what whether list1 was checked with M30 ending.

7) if syntactic analysis malfunctions, syntax error is exported；Otherwise, list1 and list2 are exported to semantic analysis mould Block.

3. the generation of semantic analysis and intermediate file

The module extracts cutter path instruction in NC code, and CYCLE recursion instruction is decomposed into G00, G01, G02, G03 Etc. elementary instructions form, segment and plan its circulating path, generate input of the intermediate file as emulation module

Intermediate file format is defined first, the elementary instruction finally extracted only needs G00, G01, G02, and tetra- kinds of G03 , therefore only need to be defined as 00,01,02,03 in intermediate file；It is subsequent to need to provide in G00 instruction Two kinds of data of X, Z, G01 need X, Z, F, G02 and G03 to need X, Z, CR or I, K, F.Wherein F instruction can be default.

Now shown in Fig. 5 for part, the process for planning the part outer profile cutting tool path locus is elaborated.It is right It is as shown in Figure 6 in the machining code of the part outer profile.

Firstly the need of roughing cutter location data are obtained, first parameter recycled by CYCLE95 is available to son The starting of program segment terminates title, and each outer profile G command status value of subprogram and cutter location coordinate, root are taken out from List2 It is rough machined that outer profile is got according to the method that the allowance for finish of X-axis specified by loop parameter and Z axis uses apex offset The coordinate data of each cutter location.

Chipping allowance cutter location data are obtained, Tool route is determined according to the cutting depth of X-direction and withdrawing amount and are cut Cut number.Available to roughing mode by CYCLE loop parameter, the processing method used in general CYCLE circulation is Parallel to the axis processing method, and the processing method in loop parameter is only used to distinguish thick/essence, inside/outside processing, therefore for Tool route Planning can carry out as follows：

1) part blank information Xr, Zr are got by subprogram first, subprogram segment code is then successively traversed, by sub- journey Sequence section code reconstructs roughing contour line equation by allowance for finish, and will originate Z coordinate as key, and profile line segment equation is made It is stored in for value in LinkedHashMap<Integer,String>In S1, and X-axis to be processed is judged by a token variable Whether non-increasing is stored to S2, if there is then the part is concave contour to reduce its manufacturing procedure coordinate.Get X-axis Minimum value, that is, Xmin on direction, then depth to be cut is X=Xr-Xmin, then Tool in Cutting number is T=X/MID, is actually cut Cutting depth is dx=X/T.

2) cutter path trajectory planning：

A) loop start that tool motion is processed to outer profile；

B) cutter first feeds a cutting depth to X-axis, then along the feeding of Z axis negative direction is parallel to, traverses S1, obtains the One section of starting X-coordinate value is less than the Eigenvector L of current cutter X-coordinate value_i, friendship is calculated according to the parametric equation of Eigenvector Point coordinate.

C) L is taken out from S1_iAll Eigenvectors later then directly will if it is not yet finished Eigenvector It is processed in band output intermediate file

D) then cutter moves _ VRT distance to 45 degree of directions of the square first angle of Z axis in a manner of G00, then just to Z axis Direction moves to point identical with loop start Z coordinate value, repeats ii) step, it is completed until S1 is traversed

E) concave contour processing is then carried out in the same manner, and step is as before.

Planned Tool route figure is as shown in Figure 5 in this example.

Claims

1. a kind of design method of the NC code interpreter based on CYCLE circulation, it is characterised in that：

Lexical Analysis Module carries out morphological analysis to NC code, analyzes the character legitimacy in NC code, if legal Then carry out syntactic analysis；

Syntax Analysis Module reading output information from the output of Lexical Analysis Module, and syntactic analysis is carried out to it, it examines each Can instruction form legal program segment, and semantic analysis is carried out if legal；

The output of syntax Analysis Module is carried out Command Resolution by semantic module, plans cutter cutting line, and will walk cutter track Line information is stored as intermediate file, as the input of analogue system.

2. the design method of the NC code interpreter according to claim 1 based on CYCLE circulation, it is characterised in that：Word Method analysis module constructs regular expression rule base previously according to machining code coding line, by reading the Machining Instruction in code Word binding rule library carries out morphological analysis.

3. the design method of the NC code interpreter according to claim 1 based on CYCLE circulation, it is characterised in that：Language Method analysis module checks the output information of Lexical Analysis Module, first analysis program, program segment integrality as unit of program segment, Regular expression rule is recycled to carry out instruction collocation legitimacy analysis.

4. the design method of the NC code interpreter according to claim 1 based on CYCLE circulation, it is characterised in that：Language Adopted analysis module by the way that CYCLE recursion instruction is decomposed into numerical control elementary instruction and determines chipping allowance knife according to parameter in circulation The data information in site determines Tool in Cutting route in actual processing, generates machine tool motion information intermediate file.