Rod repair

Contents

Contents

Introduction

1. Description of the device, analysis of operation and description of causes of operability loss of the assembly unit (unit)

2. Developing a Structural Layout for an Assembly

2.1. General Information

2.2. Development of structural diagram of assembly of KamAZ gearshift lever support

3. Choosing a Rational Way to Restore Parts

4. Selection of instrumentation

5. Calculation of chrome recovery mode

6. Determining the Normalized Time of Operations

7. Feasibility Study of the Recovery Process

8. Development of measures for labor protection and environmental protection during rod recovery

Conclusion

List of literature used

Introduction

In meeting the ever-growing needs of the national economy of our country in the transportation of passengers and cargo, road transport occupies a leading place. The solution of problems for the further development of road transport is provided by a constant increase in car production. One of the reserves for increasing the country's car fleet is car repair, therefore, its development and improvement in our country is paid great attention.

During the operation of the car, its reliability and other properties are gradually reduced due to wear of the parts, as well as corrosion and fatigue of the material from which they are made. Various faults appear in the car, which are eliminated during maintenance and repair. With long-term operation, cars reach a state where the cost of funds and labor associated with maintaining them in working condition and conditions of motor vehicles becomes more than the profit they bring in operation. This technical condition of cars is considered to be the limit, and they are sent to major repairs at a car repair plant. The task of major repairs is to restore the performance lost by cars with the least cost. Essential for solving the problem of controlling the technical condition of the car is the planned warning system for maintenance and repair of rolling stock, which regulates modes and other standards for its maintenance in a technically serviceable state.

An important element of the solution to the problem of managing the technical condition of cars and other specialized equipment is the improvement of technological processes and the organization of the production of maintenance and repair of cars and equipment, including the rationalization of the structure of the engineering and technical service, methods of making engineering decisions, technological techniques, equipment of posts and workplaces and the scientific organization of labor (NOTs). Modern car repair production currently has mechanized in-line disassembly lines, advanced methods of repairing parts, high-performance equipment, and progressive technological processes. The main source of increase of labor productivity during overhaul of cars and units is mechanization of production processes based on production concentration. At the same time, especially the mechanization of disassembly, washing, defect and assembly works is of paramount importance, since at the same time the production culture is also significantly improved and, as a result, the quality of repair. It is also important to mechanize the labor-intensive processes of internal and inter-operational transportation of cars, units and parts, since they have a direct impact on reducing cost and greatly facilitate the work of workers. Improving the quality of repairs is important, since at the same time the efficiency of the equipment and in general the entire road transport increases: the number of technically serviceable cars increases, the costs of operational repairs are reduced, etc.

Description of the device, analysis of operation and description of causes of operability loss of the assembly unit (unit)

Gearbox KamAZ5320.

The vehicle gearbox is designed to vary the frequency and torque within a wider range than the vehicle engine can provide. As a rule, this applies to internal combustion engines (ICE), which have insufficient adaptability. Vehicles with steam or electric (tram, trolleybus) engines are usually run without CP, since the latter have high adaptability and provide a change in speed and torque in a wider range than ICE. Also, the gearbox is designed to ensure reverse movement of the vehicle and long-term disconnection of the engine from the propeller when starting the engine and operating it in parking lots.

The main purpose of the CP is to convert the torque of the engine and change the traction force on the wheels of the car.

The operating condition of some gearbox parts may be loaded, and some surfaces of the gearbox moving parts may be worn, so they are subject to higher requirements for the manufacture and subsequent repair of gearbox parts.

Developing a Structural Layout for an Assembly

2.1 General Information

When assembling mechanisms and assembly units, due to the large number of installed parts, it becomes difficult to assemble and correctly install restored parts in repair production. A structure diagram is created to simplify assembly operations.

The assembly diagram is a graphical representation of all parts and assemblies included in the assembled product in the sequence of their introduction, i.e. in the sequence of installation into the product.

Conclusion

During the long operation of KamAZ, certain parts of the machine, including the support of the gearshift lever, are gradually worn out. Various faults may appear in it, which may lead to difficulties in shifting gears. In order to eliminate defects in a timely manner, the gearshift lever support is subject to maintenance or repair. Therefore, the purpose of this course project was to develop measures to improve the quality of repair of the support of the KamAZ gearshift lever.

In this course design, the rod part was investigated, the main defects arising during operation were identified, and methods for their elimination were developed. Various recovery technologies are considered. Of these, the chromium recovery technology was chosen as the simplest and most cost-effective method of repairing the rod.

During the economic analysis, it was confirmed that the use of the device is economically justified, since the cost of restoring the rod is lower than the price of the new rod. The annual profit on restoration will be 1563165.56 rubles per year.

List of literature used

Course and degree design in machine reliability and repair/I.S. Gray, A.P. Smelov, V.E. Cherkun. - 4th ed., Conversion. and supplement - M.: Agropromizdat, 1991. - 184 p.: il.

Machine repair technology: Textbook for universities/E.A. Puchin, O.N. Didmanidze, V.S. Novikov and others; Ed. E.A. Puchin. - M.: Publishing house of the UMC "Triad." – PART I. – 2006. – 348 pages.

Recovery of parts by electrolytic chromium/Kondratyev G.I. and Andreev R.A. - Kazan: Publishing House of KGSHA, 2005.

Forced rest/Kondratyev G.I. and Andreev R.A. - Kazan: Publishing House of the KGSHA, 2005.

Use of polymer materials in the repair of machines/Kondratiev G.I. and Shaikhutdinov R.R. - Kazan: Publishing House of KGSHA, 2006.

Design of technological processes for the restoration of worn out parts/Novikov V.S., Ochkovsky N.A., Telnov N.F., Achkasov K.A. - M.: MGAU, 1998. 52 pages.

GOST 2.6042000 Repair Drawings.

P 506088 Recommendations. Unified process documentation system. Rules for processing documents for repair processes.

Cutting tool. Course and degree design, text. manual under. ed. E.E. Feldstein - Mn.: missile defense design, 2002. – 320 pages.