Tacit process knowledge acquisition methods for the parts machining

doi:10.11996/JG.j.2095-302X.2024020399

Abstract

Abstract:

With the widespread application of digital processes in the manufacturing industry, how to efficiently utilize the accumulated process knowledge has become the key to enhancing the efficiency and quality of process design. However, there are technical bottlenecks in acquiring, describing, and transforming tacit process knowledge, hindering the adoption of the intelligent process design mode. Therefore, a method of acquiring tacit process knowledge for processing complex parts was proposed. Firstly, the equal-width method was employed to discretize the structured process data, a text mining based tacit process knowledge acquisition process was constructed, and tacit process knowledge was expressed through production rules. Then, a knowledge reasoning method was proposed, which combined case-based reasoning and rule-based reasoning. The recognition of tacit process knowledge was achieved using the nearest neighbor algorithm. Finally, the method for acquiring processing tacit process knowledge was effectively validated using complex machining parts of marine diesel engine cylinder heads as the verification object.

Key words: tacit knowledge, production rule, text mining, case-based reasoning, rule-based reasoning, nearest neighbor algorithm

CLC Number:

TP391

ZHANG Yiming, LIU Jinfeng, CHEN Yajie, QU Pengfei, JING Xuwen, LIU Xiaojun. Tacit process knowledge acquisition methods for the parts machining[J]. Journal of Graphics, 2024, 45(2): 399-408.

Figures/Tables 15

Fig. 1 The tacit process knowledge acquisition process of complex parts processing

Fig. 2 Process cards based on machined part

Fig. 3 Process information expression based on XML format

Table 1 Process information and data presentation form

参数	序号
参数	1	2	3	4	5
工步名称	粗铣两端面	粗镗大头孔	铣工艺侧边	铣开连杆	精镗大头孔
材料	45#	45#	45#	45#	45#
精度等级	IT12	IT12	IT12		IT8
设备名称	X2020A	双轴组合机床	X22W	X22W	双轴组合机床
切削速度	1.98	0.2	0.78	2.27	1
进给量	0.2	0.2	0.1	0.012	0.2
切削深度	2.2	1.2	20	2.0	0.12
刀具	硬质合金铣刀	硬质合金镗刀	立铣刀	锯片铣刀	硬质合金镗刀
量具	游标卡尺	游标卡尺	游标卡尺		内径千分尺
夹具	专用夹具	专用夹具	专用夹具	专用夹具	专用夹具

Fig. 4 The acquisition process of tacit process knowledge

Fig. 5 Machine process file participle

Fig. 6 Machine process file parameter conversion

Fig. 7 The numerical diagram of hierarchical process information of the work step arrangement

Fig. 8 Tacit process knowledge based on text mining

Fig. 9 CBR-RBR integrated knowledge inference flow chart

Fig. 10 Hierarchical structure model based on processing characteristics

Fig. 11 Judgment matrix based on hierarchical structure model

Fig. 12 Process card information extraction

Fig. 13 Example of acquiring process knowledge of cylinder head 1 ((a) Process information expression based on XML format; (b) Process information database)

Fig. 14 Example of acquiring process knowledge of cylinder head 2 ((a) Tacit process knowledge of hole processing characteristics; (b) Tacit process knowledge acquisition results of typical hole processing)

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