CN104318034A - Modular design method of numerically-controlled machine tool and capable of prolonging working life of numerically-controlled machine tool - Google Patents

Abstract

The invention discloses a modular design method of a numerically-controlled machine tool and capable of prolonging the working life of the numerically-controlled machine tool. The modular design method includes building a part working life module of the numerically-controlled machine tool according to a reliability allocation scheme and a part sample manual of a numerically-controlled machine tool design scheme; analyzing the structure of the numerically-controlled machine tool according to a structure scheme of the numerically-controlled machine tool design scheme, and building a part maintenance structure network on the basis of the connection mode and disassembly relationships of parts; calculating the maintenance cycles of the parts of the numerically-controlled machine tool according to a part working life estimated module of the numerically-controlled machine tool; analyzing the part maintenance structure network to build a part disassembly path constraint; conducting solving to obtain a maintenance module planning scheme of the numerically-controlled machine tool according to the maintenance cycle clustering criterion and the disassembly path constraint, and clustering the parts with the similar maintenance cycles and the same maintenance disassembly path to form a module; formulating a module periodic maintenance plan according to a module dividing scheme. The modular design method eliminates hidden fault dangers of the numerically-controlled machine tool and prolongs the working life of the numerically-controlled machine tool.

Description

A kind of numerically-controlled machine modular design method realizing long service live

Technical field

The present invention relates to a kind of numerically-controlled machine modular design method of oriented for maintenance, especially design a kind of numerically-controlled machine modular design method realizing long service live.

Background technology

Along with developing towards high-level efficiency and high-quality of modern manufacturing industry, to manufacturing the numerically-controlled machine equipment requirement used in enterprise, there is high stability and high reliability.And numerically-controlled machine is owing to existing the wearing and tearing of parts and the problem such as aging, the phenomenon broken down is inevitable.Numerically-controlled machine is a large amount of advanced process equipment integrating the technology such as machinery, electronics, hydraulic pressure, and while raising production system operational paradigm, the complexity of equipment failure control and breakdown maintenance increases greatly.Traditional Repairing of Numerically Controlled Machine Tool maintenance, for single part, causes Repairing of Numerically Controlled Machine Tool frequent, causes numerically-controlled machine cannot long-time steady operation, also considerably increases the maintenance cost of numerically-controlled machine simultaneously.

Summary of the invention

The object of invention is to provide a kind of numerically-controlled machine modular design method realizing long service live, the maintenance cycle determining part is calculated by NC Machines mission life, according to maintenance cycle clustering criteria, maintenance cycle is similar to, keeps in repair the part cluster disassembling path identical and become module.In numerically-controlled machine operational process; the maintenance of entirety batch is carried out to the part arriving fault critical state, the frequency of maintenance of numerically-controlled machine can be reduced, minimizing fault of numerical control machine tool stop time; eliminate fault to the impact of manufacturing, extend the work of numerical control machine life-span.

The present invention realizes the numerically-controlled machine modular design method of long service live, comprises the following steps:

Step 1) according to Reliability Distribution scheme, the part sample handbook in numerically-controlled machine design proposal, set up NC Machines operational life estimation model:

$t|R\left(t\right)=\exp [-{\∫}_0^{t}h\left(t\right)\mathrm{dt}]\≥R_{\mathrm{ini}}$

In formula, h (t) represents the reliable probability density function of part, and reliability function is inquired about by part sample handbook and obtained, R _inirepresent the designed reliability of part in numerically-controlled machine design proposal.

Step 2) according to the organization plan in numerically-controlled machine design proposal, analyzing numerically controlled machine tool structure, based on the annexation between part with disassemble relation, sets up part maintaining structure network; In part maintaining structure network, network node represents NC Machines and virtual parts, and between node, line represents physical connection disassembled between part; Disassembled physical connection refers to be threaded, sell to connect and be connected with key.

Step 3) according to NC Machines operational life estimation model, calculate the maintenance cycle of NC Machines.

Step 4) resolve part maintaining structure network, set up part and disassemble path constraint.

Step 5) according to maintenance cycle clustering criteria with disassemble path constraint, utilize genetic algorithm for solving to obtain Repairing of Numerically Controlled Machine Tool module planning scheme, maintenance cycle is similar to, keep in repair the part cluster disassembling path identical and become module.

Step 6) according to Module Division scheme, formulate numerically-controlled machine module periodic maintenance plan, eliminate fault of numerical control machine tool hidden danger, realize the long service live of numerically-controlled machine.

Described virtual parts, has the physical connection that can not disassemble between nulling part, the physical connection that can not disassemble refers to be welded to connect, rivet interlacement and bonding connection.

Described part maintaining structure network, Formal Representation is G={N, E}; In formula, N is part set, and E is part connection matrix

In formula, e _ijrepresent part c _iwith part c _jbetween incidence relation, if part c _iwith part c _jbetween have disassembled physical connection, then e _ij=1; Otherwise e _ij=0, i and j represents dash number, and m represents number of parts.

Described disassembles path constraint, the same part ability cluster comprising modules disassembled on path, and disassembling path constraint expression formula is:

$D_k-1\≤\underset{i=1}{\overset{m}{\mathrm{\Σ}}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}(e_{\mathrm{ij}}\×{\mathrm{mt}}_{\mathrm{ik}}\×{\mathrm{mt}}_{\mathrm{jk}})$

In formula, D _knumber of parts in representation module k, mt _ikrepresent part c _ithe subordinate factor, if c _ibelong to module k, then mt _ik=1, otherwise mt _ik=0.

Described maintenance cycle clustering criteria is by the approximate part cluster comprising modules of maintenance cycle, minimum for design object with the maintenance cycle variance of the part of comprising modules; Part maintenance cycle variance computing formula is:

$\left\{\begin{array}{c}F=\frac{1}{N_s}\underset{k=1}{\overset{N_s}{\mathrm{\Σ}}}(1-\frac{S_k}{\max \left(S_k\right)})\\ S_k=\sqrt{\frac{1}{D_k}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}[{(E_i-\stackrel{\‾}{E_k})}^2\×{\mathrm{mt}}_{\mathrm{ik}}}\end{array}\right.$

In formula, N _srepresent the module number in Repairing of Numerically Controlled Machine Tool module planning scheme, S _krepresent Repairing of Numerically Controlled Machine Tool module planning

The part maintenance cycle variance of a kth module in scheme; E _irepresent part c _imaintenance cycle; the mean time between maintenance (MTBM) of part in representation module; D _knumber of parts in representation module k.

Described Repairing of Numerically Controlled Machine Tool module planning scheme, be the maintenance cycle according to each part, the part cluster that maintenance cycle is approximate becomes a module, and the maintenance cycle of inside modules assembly is close, maintenance cycle facial difference between module, improves the maintenanceability of numerically-controlled machine.

Described Repairing of Numerically Controlled Machine Tool module planning solves, setting population scale, iterations, design variable and objective function, by evolution computing, obtains Repairing of Numerically Controlled Machine Tool module planning scheme.

Described numerically-controlled machine module periodic maintenance plan, in numerically-controlled machine operational process, to the part arrived in the module of fault critical state, overall batch implements maintenance, eliminates potential faults, extends numerically-controlled machine complete machine mission life.

Accompanying drawing explanation

Fig. 1 is the inventive method flow chart of steps;

Fig. 2 model numerical control machine tool of vertical machining center part maintaining structure network.

Concrete implementation

Below in conjunction with the drawings and specific embodiments, the present invention will be further described.

Fig. 1 is the present invention's a kind of numerically-controlled machine modular design method process flow diagram realizing long service live accordingly.

By certain model numerical control machine tool of vertical machining center, embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention; give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

1, the numerically-controlled machine be apprised of, such as certain model numerical control machine tool of vertical machining center, according to the design proposal of this lathe, record the Reliability Distribution scheme of this vertical machining centre, part sample manual information, set up NC Machines operational life estimation model, describe the mission life of NC Machines.The Reliability Distribution scheme of part is as shown in table 1.The operational life estimation model of part is as shown in table 2.

2, according to the organization plan in numerically-controlled machine design proposal, analyzing numerically controlled machine tool structure, based on the annexation between part with disassemble relation, sets up part maintaining structure network; In part maintaining structure network, network node represents NC Machines and virtual parts, and between node, line represents physical connection disassembled between part.Numerical control machine tool of vertical machining center part maintaining structure network as shown in Figure 2.

3, according to NC Machines operational life estimation model, the maintenance cycle of NC Machines is calculated.The maintenance cycle of part is as shown in table 3.

4, resolve part maintaining structure network, set up part and disassemble path constraint;

5, according to maintenance cycle clustering criteria and disassemble path constraint, utilize genetic algorithm for solving to obtain Repairing of Numerically Controlled Machine Tool module planning scheme, maintenance cycle is similar to, keep in repair the part cluster disassembling path identical and become module.Repairing of Numerically Controlled Machine Tool module planning scheme is as shown in table 4.

6, according to Module Division scheme, formulate numerically-controlled machine module periodic maintenance plan, eliminate fault of numerical control machine tool hidden danger, realize the long service live of numerically-controlled machine.Numerically-controlled machine module periodic maintenance plan is as shown in table 5.

The Reliability Distribution scheme of table 1 part

Part

Distribute reliability

Part

Distribute reliability

Part

Distribute reliability

Part

Distribute reliability

C 1

99.99％

C 8

97.50％

C 15

99.00％

C 22

98.00％

C 2

95.00％

C 9

97.50％

C 16

99.98％

C 23

99.80％

C 3

95.00％

C 10

99.99％

C 17

99.80％

C 24

99.80％

C 4

95.00％

C 11

99.00％

C 18

99.80％

C 25

98.00％

C 5

99.99％

C 12

99.99％

C 19

98.00％

?

?

C 6

99.99％

C 13

99.90％

C 20

98.00％

?

?

C 7

98.00％

C 14

99.98％

C 21

99.80％

?

?

；

The operational life estimation model of table 2 part

Part

h i(t)

Part

h i(t)

Part

h i(t)

Part

h i(t)

C 1

(1.16E+6)*t 2.1

C 8

(4.34E+3)*t 1.1

C 15

(0.46E+3)*t 0.55

C 22

(0.25E+3)*t 0.25

C 2

(0.64E+3)*t 0.45

C 9

(2.41E+3)*t 0.92

C 16

(1.41E+5)*t 1.65

C 23

(3.45E+4)*t 1.3

C 3

(0.34E+3)*t 0.25

C 10

(1.32E+6)*t 2.15

C 17

(1.24E+4)*t 0.98

C 24

(4.91E+4)*t 1.4

C 4

(0.26E+3)*t 0.45

C 11

(0.24E+3)*t 0.26

C 18

(1.16E+4)*t 0.95

C 25

(0.33E+3)*t 0.5

C 5

(0.89E+6)*t 0.2

C 12

(1.28E+6)*t 2.15

C 19

(0.31E+3)*t 0.47

?

?

C 6

(2.38E+5)*t 1.75

C 13

(3.23E+4)*t 1.2

C 20

(0.20E+3)*t 0.15

?

?

C 7

(0.22E+3)*t 0.25

C 14

(0.88E+5)*t 1.5

C 21

(3.98E+4)*t 1.34

?

?

；

The scheduled maintenance cycle of table 3 part

Part

Maintenance cycle/sky

Part

Maintenance cycle/sky

Part

Maintenance cycle/sky

Part

Maintenance cycle/sky

C 1

450

C 8

255

C 15

69

C 22

111

C 2

366

C 9

240

C 16

234

C 23

360

C 3

318

C 10

450

C 17

288

C 24

390

C 4

276

C 11

60

C 18

291

C 25

87

C 5

390

C 12

435

C 19

87

?

?

C 6

231

C 13

315

C 20

105

?

?

C 7

99

C 14

213

C 21

375

?

?

；

Table 4 Repairing of Numerically Controlled Machine Tool module planning scheme

；

Table 5 numerically-controlled machine module periodic maintenance plan

Module is numbered	Maintenance cycle/sky
		M1	390
M2	366
		M3	213
M4	240
		M5	288
M6	276
		M7	99
M8	60
		M9	360

。

Claims (8)

1. realize a numerically-controlled machine modular design method for long service live, it is characterized in that, step is as follows:

Step 1) according to Reliability Distribution scheme, the part sample handbook in numerically-controlled machine design proposal, set up NC Machines operational life estimation model:

$t|R\left(t\right)=\exp [-{\∫}_0^{t}h\left(t\right)\mathrm{dt}]\≥R_{\mathrm{ini}}$

In formula, h (t) represents the reliable probability density function of part, and reliability function is inquired about by part sample handbook and obtained, R _inirepresent the designed reliability of part in numerically-controlled machine design proposal;

Step 2) according to the organization plan in numerically-controlled machine design proposal, analyzing numerically controlled machine tool structure, based on the annexation between part with disassemble relation, sets up part maintaining structure network; In part maintaining structure network, network node represents NC Machines and virtual parts, and between node, line represents physical connection disassembled between part; Disassembled physical connection refers to be threaded, sell to connect and be connected with key;

Step 3) according to NC Machines operational life estimation model, calculate the maintenance cycle of NC Machines;

Step 4) resolve part maintaining structure network, set up part and disassemble path constraint;

Step 5) according to maintenance cycle clustering criteria with disassemble path constraint, utilize genetic algorithm for solving to obtain Repairing of Numerically Controlled Machine Tool module planning scheme, maintenance cycle is similar to, keep in repair the part cluster disassembling path identical and become module;

Step 6) according to Module Division scheme, formulate numerically-controlled machine module periodic maintenance plan, eliminate fault of numerical control machine tool hidden danger, realize the long service live of numerically-controlled machine.

2. a kind of numerically-controlled machine modular design method realizing long service live according to claim 1, it is characterized in that, described virtual parts, has the physical connection that can not disassemble between nulling part, the physical connection that can not disassemble refers to be welded to connect, rivet interlacement and bonding connection.

3. a kind of numerically-controlled machine modular design method realizing long service live according to claim 1, is characterized in that, described part maintaining structure network, and Formal Representation is G={N, E}; In formula, N is part set, and E is part connection matrix

In formula, e _ijrepresent part c _iwith part c _jbetween incidence relation, if part c _iwith part c _jbetween have disassembled physical connection, then e _ij=1; Otherwise e _ij=0, i and j represents dash number, and m represents number of parts.

4. a kind of numerically-controlled machine modular design method realizing long service live according to claim 1, it is characterized in that, described disassembles path constraint, the same part ability cluster comprising modules disassembled on path, and disassembling path constraint expression formula is:

$D_k-1\≤\underset{i=1}{\overset{m}{\mathrm{\Σ}}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}(e_{\mathrm{ij}}\×{\mathrm{mt}}_{\mathrm{ik}}\×{\mathrm{mt}}_{\mathrm{jk}})$

In formula, D _knumber of parts in representation module k, mt _ikrepresent part c _ithe subordinate factor, if c _ibelong to module k, then mt _ik=1, otherwise mt _ik=0.

5. a kind of numerically-controlled machine modular design method realizing long service live according to claim 1, it is characterized in that, described maintenance cycle clustering criteria is by the approximate part cluster comprising modules of maintenance cycle, minimum for design object with the maintenance cycle variance of the part of comprising modules; Part maintenance cycle variance computing formula is:

$\left\{\begin{array}{c}F=\frac{1}{N_s}\underset{k=1}{\overset{N_s}{\mathrm{\Σ}}}(1-\frac{S_k}{\max \left(S_k\right)})\\ S_k=\sqrt{\frac{1}{D_k}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}[{(E_i-\stackrel{\‾}{E_k})}^2\×{\mathrm{mt}}_{\mathrm{ik}}]}\end{array}\right.$

In formula, N _srepresent the module number in Repairing of Numerically Controlled Machine Tool module planning scheme, S _krepresent the part maintenance cycle variance of a kth module in Repairing of Numerically Controlled Machine Tool module planning scheme; E _irepresent part c _imaintenance cycle; the mean time between maintenance (MTBM) of part in representation module; D _knumber of parts in representation module k.

6. a kind of numerically-controlled machine modular design method realizing long service live according to claim 1, it is characterized in that, described Repairing of Numerically Controlled Machine Tool module planning scheme, it is the maintenance cycle according to each part, the part cluster that maintenance cycle is approximate becomes a module, the maintenance cycle of inside modules assembly is close, the maintenance cycle facial difference between module, improves the maintenanceability of numerically-controlled machine.

7. a kind of numerically-controlled machine modular design method realizing long service live according to claim 1, it is characterized in that, described Repairing of Numerically Controlled Machine Tool module planning solves, setting population scale, iterations, design variable and objective function, by evolution computing, obtain Repairing of Numerically Controlled Machine Tool module planning scheme.

8. a kind of numerically-controlled machine modular design method realizing long service live according to claim 1, it is characterized in that, described numerically-controlled machine module periodic maintenance plan, in numerically-controlled machine operational process, to the part arrived in the module of fault critical state, overall batch implements maintenance, eliminates potential faults, extends numerically-controlled machine complete machine mission life.