A composite milling machining center and a control system thereof

Abstract

The application relates to the technical field of milling machining, and discloses a composite milling machining center and a control system thereof. The milling machining center adopts an upper and lower computer structure, the machining equipment adopts a structure of a tool changing main shaft plus a drill cover, the needs of milling and rapid drilling are considered and met, list machining is adopted, the trouble of frequently manually switching programs in traditional multi-variety single-piece machining is solved, the production efficiency is improved, and manual misoperation is reduced. The suction disc arranged in the application can lift the workpiece, the cutter can be lowered to the lower surface of the workpiece, the milling type of a profile cutter and the milling type machining problem of an arbitrary angle of a side edge are solved, the parameterized tool path is written in advance through software, the tool path is adjusted through parameter adjustment, the efficiency is improved, and the requirement of an operator is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of milling machining, and in particular to a composite milling machining center and a control system thereof. BACKGROUND

[0002] Drilling, sawing and milling are common process procedures in the furniture industry, and a drilling-sawing-milling composite machining center is a device for simultaneously realizing the three machining processes. At present, the CNC system of a numerical control device loads a machining file and then processes in batches, and after the products in the batch are machined, the next machining file is selected and loaded (manual selection and loading or sending are required). This mode cannot adapt to mixed production lines of multiple varieties and single pieces and high-efficiency production requirements, and is not conducive to production and information management of a factory.

[0003] Meanwhile, the CNC system of the numerical control device cannot realize real-time monitoring of the working state of the milling machining center, and periodic detection is mostly realized by manual operation, which has strong hysteresis and may cause machining failure, thereby wasting production resources. SUMMARY

[0004] The application aims to provide a composite milling machining center and a control system thereof, and solve the above technical problems.

[0005] A composite milling machining center comprises an upper control assembly and a lower motion assembly.

[0006] The upper control assembly is responsible for data processing and man-machine interaction, and the lower motion assembly is responsible for execution of machining actions.

[0007] The upper control assembly comprises an electrical box and an operation table.

[0008] The lower motion assembly comprises a mounting frame, four light curtain support frames are arranged in an array on the two sides of the mounting frame, a machining device is arranged on one side of the top of the mounting frame, and a plurality of movable aluminum squares are arranged in an array on the other side of the top of the mounting frame; a plurality of suction cups convenient for dismounting are arranged on each aluminum square, and two foot switches are symmetrically arranged on the bottom of the mounting frame.

[0009] The bottom of the aluminum square is provided with a positioning rod and a bracket, the bracket is used for controlling the lifting of the aluminum square, and the positioning rod is used for fixing the position of the aluminum square.

[0010] The lower motion assembly further comprises a vacuum pump, and the vacuum pump is used for controlling the suction cups.

[0011] A control system of a composite milling machining center, and a working method of the control system.

[0012] Step S1, the central control software extracts and analyzes the processing information file;

[0013] Step S2, the workstations and auxiliary parameters are set;

[0014] Step S3, after the processing is activated, according to the processing information extracted by the central control software and the configuration of the tool table, the tool automatically matches the processing G code file of the current plate to be processed and sends it to the controller;

[0015] Step S4, the plate is loaded and the processing is started;

[0016] Step S5, after the processing is completed, the controller feeds back the completion signal to the central control software, and the central control software generates the processing G code of the next plate to be processed and sends it to the controller;

[0017] Step S6, the next plate is loaded and the processing is started.

[0018] As a further description of the present application, the specific working process of step S4 includes:

[0019] Step S41, according to the size of the plate, the aluminum square is moved left and right, and the suction cup is placed in a suitable position;

[0020] Step S42, press one of the foot switches to make the positioning rod and the bracket rise;

[0021] Step S43, loading;

[0022] Step S44, press the other foot switch to start the vacuum pump adsorption and lower the bracket.

[0023] As a further description of the present application, the system further has a parameter monitoring module for monitoring the working parameters during the working process of the composite milling machining center, analyzing the working parameters, and evaluating the working state of the composite milling machining center.

[0024] As a further description of the present application, the specific working process of evaluating the working state of the composite milling machining center includes:

[0025] First, calculate the processing risk coefficient according to the processing parameters;

[0026] Second, calculate the product risk coefficient according to the parameters of the finished product;

[0027] Finally, evaluate the working state of the composite milling machining center according to the finished product processing risk coefficient and the product risk coefficient.

[0028] As a further description of the present application, the working process of obtaining the processing risk coefficient includes:

[0029] According to the properties of the material to be processed and the processing requirements, a standard data curve V0(t) of the milling speed changing with time and a standard data curve W0(t) of the tool rotation speed changing with time in the milling process are set;

[0030] An actual data curve V(t) of the milling speed changing with time and an actual data curve W(t) of the tool rotation speed changing with time in the milling process are obtained;

[0031] The processing risk coefficient is calculated by the following formula:

[0032]

[0033] Wherein, f(V(t), W(t)) = πdW(t) / 1000;

[0034] In the formula, ρ is the processing risk coefficient, t1 is the processing start time, t2 is the processing end time, f(V(t), W(t)) is the milling speed-tool rotation speed relationship function, α, β and γ are weight coefficients, and d is the tool observation point diameter.

[0035] As a further description of the scheme of the present application, the product risk coefficient obtaining process comprises:

[0036] After the finished product is obtained after the milling process, the actual parameter values of the finished product are obtained, and then the product risk coefficient is calculated by the following formula:

[0037]

[0038] Wherein, σ is the product risk coefficient, n is the number of parameter items, i ∈ [1, n]; A i is the detection value of the i-th parameter, A i0 is the standard value of the i-th parameter, d i is the reference value of the i-th parameter, k i is the weight coefficient of the i-th parameter.

[0039] As a further description of the scheme of the present application, the process of evaluating the working state of the composite milling machining center comprises:

[0040] A mathematical model of the working state coefficient of the composite milling machining center is constructed, and the expression is:

[0041] C = ρ * σ;

[0042] The working state coefficient C of the composite milling machining center is compared with the set threshold value C0 of the working state coefficient of the composite milling machining center, if C is greater than or equal to C0, it is judged that the running state of the composite milling machining center is abnormal, otherwise, it is judged that the running state of the composite milling machining center is normal.

[0043] The beneficial effects of the present application are: 1, the milling machining center of the present application adopts an upper and lower machine structure, that is, the upper machine is a PC, and the lower machine is a motion controller; the PC is responsible for data processing and human-computer interaction, and the lower machine is responsible for the execution of machining actions, the upper and lower machines communicate through PCI-E connection, the machining equipment adopts a structure of a tool changing main shaft plus a drill package, and the needs of milling and rapid drilling are considered and met, the present application adopts list processing, solves the trouble of frequent manual program switching required by traditional multi-variety single-piece machining, improves production efficiency, and reduces manual misoperation, the suction cup provided in the present application can lift the workpiece, the cutter can be lowered to below the workpiece, and the problems of profile cutter milling and milling at an arbitrary angle on the side are solved, the parameterized tool path is written in advance through software, the tool path is adjusted through parameter adjustment, efficiency is improved, and the requirements of operators are also reduced.

[0044] 2, the present application obtains a milling speed change standard data curve V0(t) and a cutter speed change standard data curve W0(t) with time in the machining process according to the material properties to be machined, then real-time monitors a milling speed change actual data curve V(t) and a cutter speed change actual data curve W(t) with time in the milling machining process, and substitutes the obtained parameters into a formula to calculate the machining risk coefficient of the milling machining center, obtains actual parameter values of finished products after milling machining, and combines the standard values of various parameters to calculate the product risk coefficient, according to the machining risk coefficient and the product risk coefficient, a composite milling machining center working state coefficient C is calculated by constructing a composite milling machining center working state coefficient mathematical model, the composite milling machining center working state coefficient C is compared with the set composite milling machining center working state coefficient threshold C0, if C is greater than or equal to C0, it is judged that the running state of the composite milling machining center is abnormal, otherwise, it is judged that the running state of the composite milling machining center is normal. BRIEF DESCRIPTION OF DRAWINGS

[0045] The present application will be further described below in combination with the drawings.

[0046] Figure 1 is a structure diagram of a composite milling machining center provided by the present application Figure 1 ;

[0047] Figure 2 is a structure diagram of a composite milling machining center provided by the present application Figure 2 ;

[0048] Figure 3 is a work position layout diagram of a composite milling machining center provided by the present application

[0049] Figure 4 is a positioning mechanism diagram of a composite milling machining center provided by the present application DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0051] Please refer to Figure 1 、 Figure 2 The present application is a kind of composite milling machining center, the machining center includes: upper control assembly and lower motion assembly.

[0052] The upper control assembly is responsible for data processing and human-computer interaction, and the lower motion assembly is responsible for the execution of machining action.

[0053] The upper control assembly includes an electrical box 1 and an operating platform 2.

[0054] The lower motion assembly includes a mounting bracket 3, four light curtain support frames 4 are arranged on both sides of the mounting bracket 3, a machining device 5 is arranged on one side of the top of the mounting bracket 3, and a plurality of movable aluminum squares 6 are arranged on the other side of the top of the mounting bracket 3, a plurality of suction cups 7 are arranged on each aluminum square 6, and two foot switches 8 are symmetrically arranged on both sides of the bottom of the mounting bracket 3.

[0055] The bottom of the aluminum square 6 is provided with a positioning rod and a bracket, the bracket is used to control the lifting of the aluminum square 6, and the positioning rod is used to fix the position of the aluminum square 6.

[0056] The lower motion assembly further includes a vacuum pump, and the vacuum pump is used to control the suction cup 7.

[0057] Through the above technical solution, the milling machining center adopts an upper and lower computer structure, that is, the upper computer is a PC, and the lower computer is a motion controller; the PC is responsible for data processing and human-computer interaction, and the lower computer is responsible for the execution of machining action; the upper and lower computers are connected and communicated through PCI-E; the machining device 5 adopts a structure of a tool changing spindle plus a drill package, which takes into account and meets the needs of milling and rapid drilling; the present application adopts list processing, solves the trouble of frequent manual program switching in traditional multi-variety single-piece machining, improves production efficiency, and reduces manual errors; the suction cup provided by the present application can lift the workpiece, and the tool can be lowered to the bottom of the workpiece, thereby solving the problems of profile tool milling and side milling at any angle; the software writes the parameterized tool path in advance, and the tool path is adjusted through parameter adjustment, thereby improving efficiency and reducing the requirements for operators.

[0058] A control system of a composite milling machining center, a working method of the control system comprises:

[0059] Step S1, the central control software extracts and analyzes the processing information file, and the file format is MPR, BAN, DXF, XML and the like output by the single breaking software;

[0060] Step S2, setting the work station and auxiliary parameters;

[0061] Step S3, after the processing is activated, according to the processing information such as the position, depth and size of the hole or slot extracted by the central control software in advance and the configuration of the tool table, the tool is automatically matched to output the processing G code file of the current plate to be processed, and is sent to the controller;

[0062] Step S4, loading the plate and starting processing;

[0063] Step S5, after the processing is completed, the controller feeds back the completion signal to the central control software, and the central control software generates the processing G code of the next plate to be processed and sends it to the controller;

[0064] Step S6, continue to load the next plate and start processing.

[0065] Please refer to Figure 3 、 Figure 4 , the work station is a total of 4 origins on the machining table, that is, 4 groups of rests, which are divided into left and right two areas, so that the machining table is divided into: left area front rest full table work station N, left area front rest left table work station S, left area rear rest full table work station N1, left area rear rest left table work station S1, right area front rest full table work station M, right area front rest right table work station R, right area rear rest full table work station M1, right area rear rest right table work station R1, a total of 8 work stations;

[0066] The auxiliary parameters include processing mode and processing mode selection, wherein the processing mode includes: default (processing in N work station), single area fixed processing (any work station in 8 work stations can be selected), double area fixed processing (left area selects one of N, S, N1 and S1, and right area selects one of M, R, M1 and R1), four plate mode (S, S1, R and R1 four work stations execute processing); the processing mode includes: sequential processing (processing to the end according to the loading order), and cyclic reciprocating processing (returning to the first to continue processing after processing to the end).

[0067] As a further description of the scheme of the application, the specific working process of step S4 includes:

[0068] Step S41, according to the size of the plate, moving the aluminum square 6 left and right, and selecting a suitable position to place the suction cup 7;

[0069] Step S42, stepping on one of the foot switches 8 to make the positioning rod and the bracket rise;

[0070] Step S43, loading.

[0071] Step S44, step on another foot switch 8, start vacuum pump adsorption, down the bracket.

[0072] As a further description of the present application, the system is also provided with a parameter monitoring module for monitoring the working parameters during the working process of the composite milling machining center and analyzing the working parameters to evaluate the working state of the composite milling machining center.

[0073] As a further description of the present application, the specific working process of evaluating the working state of the composite milling machining center includes:

[0074] First, calculate the machining risk coefficient according to the machining parameters;

[0075] Second, calculate the product risk coefficient according to the parameters of the finished product;

[0076] Finally, evaluate the working state of the composite milling machining center according to the machining risk coefficient and the product risk coefficient of the finished product.

[0077] As a further description of the present application, the working process of obtaining the machining risk coefficient includes:

[0078] According to the properties of the material to be machined and the machining requirements, set the milling speed-time variation standard data curve V0(t) and the tool rotation speed-time variation standard data curve W0(t) in the milling machining process;

[0079] Obtain the milling speed-time variation actual data curve V(t) and the tool rotation speed-time variation actual data curve W(t) in the milling machining process;

[0080] Calculate the machining risk coefficient by the following formula:

[0081]

[0082] Wherein, f(t(t), W(t)) = πdW(t) / 1000;

[0083] In the formula, ρ is the machining risk coefficient, t1 is the machining start time, t2 is the machining end time, f(V(t), W(t)) is the milling speed-tool rotation speed relationship function, α, β and γ are weight coefficients, and d is the diameter of the tool observation point.

[0084] As a further description of the present application, the working process of obtaining the product risk coefficient includes:

[0085] Obtain the actual parameter values of the finished product after the milling machining, and then calculate the product risk coefficient by the following formula:

[0086]

[0087] wherein, sigma is a product risk coefficient, n is a parameter item number, i is an element of [1, n]; A i is a detection value of the i-th parameter, A i0 is a standard value of the i-th parameter, d i is a reference value of the i-th parameter, k i is a weight coefficient of the i-th parameter.

[0088] As a further description of the present application, the process of evaluating the working state of the composite milling machining center comprises:

[0089] A mathematical model of the working state coefficient of the composite milling machining center is constructed, and the expression is:

[0090] C = p * sigma;

[0091] The working state coefficient C of the composite milling machining center is compared with the set working state coefficient threshold C0 of the composite milling machining center, if C is greater than or equal to C0, it is judged that the running state of the composite milling machining center is abnormal, otherwise, it is judged that the running state of the composite milling machining center is normal.

[0092] Through the above technical scheme, in the embodiment, the standard data curve V0(t) of the milling speed changing with time and the standard data curve W0(t) of the tool rotation speed changing with time in the machining process are obtained according to the properties of the material to be machined, then the actual data curve V(t) of the milling speed changing with time and the actual data curve W(t) of the tool rotation speed changing with time in the milling machining process are monitored in real time, and the obtained parameters are substituted into the formula to calculate the machining risk coefficient of the milling machining center, the actual parameter values of the finished product after the milling machining are obtained, and the product risk coefficient is calculated in combination with the standard values of the parameters, the working state coefficient C of the composite milling machining center is calculated according to the working state coefficient mathematical model of the composite milling machining center constructed by the machining risk coefficient and the product risk coefficient, the working state coefficient C of the composite milling machining center is compared with the set working state coefficient threshold C0 of the composite milling machining center, if C is greater than or equal to C0, it is judged that the running state of the composite milling machining center is abnormal, otherwise, it is judged that the running state of the composite milling machining center is normal.

[0093] The above has described one embodiment of the present application in detail, but the content is only the preferred embodiment of the present application, and cannot be considered as limiting the implementation range of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. A combined milling machining center, characterized by, The machining center comprises an upper control assembly and a lower motion assembly; The upper control assembly is responsible for data processing and human-computer interaction, and the lower motion assembly is responsible for execution of machining actions; The upper control assembly comprises an electrical box (1) and an operation table (2); The lower motion assembly comprises a mounting rack (3), four light curtain support frames (4) are arranged in an array on both sides of the mounting rack (3), a machining device (5) is arranged on one side of the top of the mounting rack (3), and a plurality of movable aluminum squares (6) are arranged in an array on the other side of the top of the mounting rack (3), a plurality of suction cups (7) are arranged on each aluminum square (6) for facilitating dismounting, and two foot switches (8) are symmetrically arranged on both sides of the bottom of the mounting rack (3); A positioning rod and a bracket are arranged at the bottom of the aluminum square (6), the bracket is used for controlling the lifting of the aluminum square (6), and the positioning rod is used for fixing the position of the aluminum square (6); The lower motion assembly further comprises a vacuum pump, and the vacuum pump is used for controlling the suction cup (7); The machining center further comprises a control system, and the control system is provided with a parameter monitoring module, which is used for monitoring working parameters in the working process of the composite milling machining center, analyzing the working parameters, and evaluating the working state of the composite milling machining center; The specific working process of evaluating the working state of the composite milling machining center comprises the following steps: Firstly, calculating a machining risk coefficient according to machining parameters; Secondly, calculating a product risk coefficient according to various parameters of a finished product; Finally, evaluating the working state of the composite milling machining center according to the machining risk coefficient and the product risk coefficient of the finished product; The working process of obtaining the machining risk coefficient comprises the following steps: According to the properties of the material to be processed and the processing requirements, a standard data curve of the milling speed changing with time in the milling process is set and a standard data curve of the tool rotation speed changing with time ; obtaining actual data curves of the milling speed varying with time and the tool rotation speed varying with time in the milling process obtaining actual data curves of the milling speed varying with time and the tool rotation speed varying with time in the milling process ; The machining risk coefficient is calculated by the following formula: = wherein ; wherein is a machining risk coefficient, is a machining start time, is a machining end time, is a milling speed - tool rotational speed relationship function, , and are weight coefficients, d is a tool observation point diameter; The working process of obtaining the product risk coefficient comprises the following steps: After obtaining various actual parameter values of the finished product after milling machining, the product risk coefficient is calculated by the following formula: ； wherein, is a product risk coefficient, is a parameter item number, i∈[1, n]; is a detection value of the i-th parameter, is a standard value of the i-th parameter, is a reference value of the i-th parameter, is a weight coefficient of the i-th parameter; The process of evaluating the working state of the composite milling machining center comprises the following steps: A mathematical model of the working state coefficient of the composite milling machining center is constructed, and the expression is as follows: ； The composite milling machining center working state coefficient C is compared with the set composite milling machining center working state coefficient threshold value If Is greater than or equal to Then it is judged that the composite milling machining center running state is abnormal, otherwise, it is judged that the composite milling machining center running state is normal.

2. A control system of a hybrid milling machining center for controlling the hybrid milling machining center according to claim 1, characterized in that, The working method of the control system comprises the following steps: Step S1, the central control software extracts and analyzes machining information files; Step S2, setting workstations and auxiliary parameters; Step S3, after activating machining, the central control software automatically matches a tool according to the machining information and the configuration of a tool table extracted before, outputs a machining G code file of a current plate to be machined, and sends the machining G code file to a controller; Step S4, loading a plate and starting machining; Step S5, after machining is completed, the controller feeds back a completion signal to the central control software, the central control software generates a machining G code of a next plate to be machined, and sends the machining G code to the controller; Step S6, continuing to load the next plate and starting machining.

3. The control system of a combined milling machining center according to claim 2, characterized in that, The specific working process of step S4 comprises the following steps: Step S41, moving the aluminum square (6) left and right according to the size of the plate, and selecting a suitable position to place the suction cup (7); Step S42, stepping on one of the foot switches (8) to make the positioning rod and the bracket rise; Step S43, loading; Step S44, stepping on the other foot switch (8) to start vacuum adsorption and lower the bracket.

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