Tool Shop Research Articles

Influence of hot tool parameters on heat recovery in a space-heating and ventilation system

A study has been carried out on heat recovery from air that ventilates a hot tool in a tool shop. The recovered heat is used to preheat air for space heating of this tool shop. Software has been used to analyze the heat-recovery efficiency and thermal comfort (TC) when the size and temperature of the hot tool are varied. An increase in hot tool size of 10% yields an energy loss of up to 2% and temperatures of the tool-shop space that are 6% higher than the TC temperature. This energy loss can be avoided if we tune the heat-recovery system (HRS) to reach TC as before. A 10% decrease of hot tool size yields at most 5% in energy saving and a tool-shop-space temperature 6% lower than the TC temperature. Further HRS tuning to provide TC will reduce energy saving. Higher or lower tool temperatures do not appreciably change the energy expenditure.

Shop floor control and tool loading policies in flexible manufacturing systems

Abstract We develop a classification scheme and taxonomy of operating decisions in flexible manufacturing systems (FMS). The taxonomy is used to identify a promising research area termed General FMSs (GFMS), where very little academic work has been reported to date in the prior literature. A decision framework for the development of tool loading and shop floor control policies in GFMS is also presented, and used to highlight specific future research directions. Strategic justification for developing operating policies for the GFMS classification is also provided.

Industrial energy use-III. The prospects for providing motive power in a machine tool shop from a centralized hydraulic system

This paper describes a comparative economic study of electric and hydraulic power transmission. the data and results apply to a particular site, but the methodology is generally applicable. the study used mathematical models of the various components in electromechanical and hydraulic power transmission systems to determine in each case the necessary energy input to supply a specified load cycle at the machine tool spindle. the study concludes that a central hydraulic system on the site studied would operate with 20 per cent less energy consumption than the existing electromechanical system. the economic appraisal of the merits of electromechanical and hydraulic power distribution systems is dominated by capital savings in the final drives; these are assessed.

工作機械工場の基礎について<機械工作小特集号>

工作機械工場の基礎について<機械工作小特集号>

Application of mathematical methods and digital computers for determining the optimal conditions for machine tool production specialization in the parts and fittings industry

An increase in the production of machine tools within the various branches of the industry can be realized through the specialization of the medium sized and large shops for manufacturing a narrow range of machine tools, and curtailment of machine tool production in small shops, as well as through the creation of affiliated factories and shops for machine tool and rig production. Studies of the production capacities of machine tool shops and their sections, regarding the manufacture and repairs of machine tools and industrial rigs in alt fittings and accessories factories at the present time, showed that 25% of the tools manufactured are cutting tools, 5% are measuring instruments, 10% are auxiliary tools, 2.5% are various other tools, 6% are punches for hot and cold stamping, 14% are casting rigs, 3.87o are accessories, and 3% are molds for nonmetallic materials. Only 24.5% of the cutting tools manufactured are special tools, while the remaining 75.5% consist of standard cutting tools. Machine tool shops and certain sections of fittings and accessories factories manufacture 79% of the standard cutting tools, 77.4% drills, 50% countersink reamers, 45% reamers, 44% milling cutters, 43% taps, and 9%broaches. The machine tool shops of the factories manufacture tools and industrial rigs for their own use. Manufacture of tools for other factories is limited, and has a sporadic character. Cooperation in the manufacture of tools and rigs is practically nonexistent. The manufacturing program of machine tool shops and their sections enumerates scores of different sizes and types of tools and various types of rigs (according to the type of the product manufactured, and Wpe of production). The large number of different varieties of tools manufactured by the affiliated factories is chiefly due ~o the relative lack of standardization, normalization, and unification of machine tools, punches, accessories, molds, and other types of rigs used in processing. The low degree of specialization in the area of machine tool production has hindered the introduction of new techniques and technology. Consequently, the industrial equipment existing in the machine tool shops and sections of many factories is not capable of fulfilling the current demands. This manifests itself, first of all, in the condition of the equipment. Thus, metal cutting equipment, the cost of which comprises 50-80% of the basic funds, often consists of universal lathes exhibiting considerable wear. In an analysis of the industrial processes involved in the manufacture of specific machine tools and rigs in different factories, attention is called to the variety of the applicable techniques employed in their production. One encounters a great deal of variation in the amount of labor involved in the manufacture of one and the same tool. Thus, the labor used in the manufacture of cutting tools varies considerably, and is 3-7 times that consumed in factories specializing in the manufacture of such tools. A similar situation exists with regard to the manufacture of other tools.

An Application of the Critical Path Method to Job Shop Scheduling—A Case Study

Small and medium-sized job shops are often run with little or no production scheduling. As the number and complexity of jobs increases, management finds it increasingly difficult to control costs and still maintain delivery dates. In order to provide management with the needed control, some practical scheduling system is needed. This case study describes the installation, in a medium-sized tool shop, of such a system based on CPM and operated manually. Emphasis is placed on the problems of converting CPM into a continuing, working system under the manual operation of shop scheduling personnel. Much of the value of CPM in the final system is its use as a “one-shot” analytical tool to aid in the production of a shop schedule. An unusual feature of the system is that it provides a method for the routine scheduling of two critical manpower resources in a multiple-network situation. Management Technology, ISSN 0542-4917, was published as a separate journal from 1960 to 1964. In 1965 it was merged into Management Science.

The experience of introducing physical education into the work process of fitters at the 1st State Ball Bearing Plant

The task of this work was to experimentally justify the methodology of physical fitness activities in the labor process of locksmiths of the gauge department of the tool shop. For this purpose the group of workers consisting of 80 people was allocated.