Whereas there exist such problems as compaction blind spot in the edge and cornier area of construction rod, and the narrow site has disabled the large rod roller to go into operation, an innovative ...design method based on the TRIZ theory has been put forward. Meanwhile, a detailed solution to the conflicts generated in the efforts to improve the differency of the large road roller has been proposed through the use of the contradiction conflict solution matrix comprised by 39 engineering parameters and 40 pieces of inventive principles pertaining to TRIZ. Furthermore, the feasibility to conduct TRIZ-theory-based innovative design in the field of engineering machinery has been manifested, thus providing important theoretical tools for design ideas in the field of traditional engineering innovation.
Hole-making in CFRP is generally done using drills. However, exit burrs and delamination occur around the hole. Therefore, we propose a new processing method with a dual-axis-driven grindstone ...mechanism. This mechanism has not only grinding wheel rotation but also right-angled rotation. This processing method makes it possible to drill a hole in CFRP. We present the basic performance of the drilling process using the dual-axis-driven grindstone mechanism.
This study develops models for predicting the economic lifetime of drilling machines used in mining. It uses three cases, each represented by a MATLAB code, to develop an optimisation model. The ...resulting ORT is fed as input to an artificial neural network (ANN) and the results translated into a relatively simple equation. The study finds that increasing the purchase price and decreasing the operating and maintenance costs will increase a machine's ORT linearly. Decreased maintenance cost has the largest impact on ORT, followed by increased purchase price and decreased operating cost. The ANN method gives a series of basic weight and response functions which can be made available to any engineer without the use of complicated software. It also helps decision-makers determine the best time economically to replace an old machine with a new one; thus, it can be extended to more general applications in the mining industry.
Radial drilling machine is an important equipment in metal workpiece processing, which is widely used. Traditional machine tools use AC contactor to build control system, and the control system of AC ...contactor is huge. Therefore, the reliability is poor, the working life of electrical components is short, and it brings difficulties to repair and maintenance. Because the traditional relay control mainly relies on hardware for wiring in the logic structure, the wiring is extremely complex. Therefore, the system can not adapt to the changing needs of process production, and can not achieve centralized control in actual production. The working time of radial drilling machine is long, the AC contactor in the control circuit will start frequently. When the system works for a certain time, the failure rate of contact and coil of contactor will be greatly improved. The control technology can transform the relay control circuit of radial drilling machine, and can obviously solve the traditional fault problem.
Selected problems of designing a new generation automated drilling machine for tunnelling and underground mining work are presented. The requirements needed to build a machine of this class were ...identified and collected. An original concept of the self-propelled drilling machine was developed. A virtual model of the machine was created and subjected to different numerical cases of loading. FEM strength calculations of the load-bearing structures were carried out. All the machine's work operations have been fully automated. The result is a new original automated drilling machine.
Small tolerances are very important factors for drilling machines. Due to the mechanical friction on their moving parts, it is necessary to predict vibration effects. This investigation is focused on ...design of robust neural network predictors for analyzing vibration effects on moving parts of drilling machines. The research is divided into two parts; the first part is experimental investigation, the second part is simulation analysis with neural networks. Therefore, a real time drilling machine is used for vibrations under working conditions. The measured real vibration parameters are analyzed with neural network. As a result, simulation approaches show that radial basis neural network has superior performance to adapt real time parameters of drilling machines.
We propose a new grinding processing method with a dual-axis-driven grinding wheel for drilling of CFRP. Although we evaluated the processing characteristics of the SiC-grinding wheel, only a maximum ...of 20 holes could be drilled due to clogging of the wheel. Then, we evaluated the durability of the grinding wheels using two types of electroplated grinding wheel. The results of processing experiments showed that durability of both grinding wheels was higher than the SiC-grinding wheel.
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