Electrical equipment of the gear hobbing machine

Contents

INTRODUCTION

SECTION 1. MAJOR PART

1.1. Toothfreather machine

1.2. Electrical equipment of toothfreather machine

SECTION 2 DESIGN PART

SECTION 3 PROCESS PART

Gear cutter device

SECTION 4 DESIGN PART

SECTION 5. SAFETY PRECAUTIONS

CONCLUSION

LIST OF LITERATURE

APPLICATION

Introduction

Electricity plays a very significant role in modern society. At present, it is impossible to imagine any branch of public production where electrical energy would not be used. Without electrification in modern society, industry, agriculture, medicine, life and other branches of human activity are unthinkable.

Most of the electricity is consumed by industrial enterprises. During the production process, electrical energy is converted into mechanical, light, thermal or other, by which the workpiece is exposed. Various equipment and machines are used to convert electrical energy into other types - standard and special devices for processing raw materials for the production of any product. Metal cutting machines are divided into universal, specialized and special.

A cutter is a metal cutting mechanism for machining cylindrical parts to obtain a toothed profile. There are two main types of design: horizontal and vertical. Depending on the peculiarities of the design, the machine can handle various types of engagement: from straight and helical wheels, to the formation of an involute type profile, which, like other complex surfaces, is obtained by rolling. According to the principle of operation, the equipment belongs to the fifth group of the third type of metal cutting machines. Thus, according to the generally accepted classification, a separate group is allocated to toothfree machines. Compared to other semi-automatic devices, this method of processing is characterized by high performance and versatility of application.

The relevance of the research topic is due to the need to increase the efficiency of metal cutting machines in modern machine building, using a toothed cutting machine.

One of the main structural elements of the toothfreather machine are mechanical guitars (speeds, feeds, division, differential). An important task is to coordinate all these mass movements. But mechanical guitars do not provide high processing accuracy. Therefore, methods for improving accuracy by replacing mechanical guitars with electronic ones have been developed. Previously, these methods have been considered superficially .

The object of the study is electrical equipment.

The subject of the study is a toothfreather machine.

The purpose of the study is the electrical equipment of the toothfreather. In connection with this goal, I will highlight the following tasks:

To consider the types and characteristics of cutting machines;

study the structure of the machine;

explain how and from what the machine is powered;

Describe the maintenance and repair of the toothfreather.

But further improvement of accuracy and automation requires the development of new or improvement of existing schematic diagrams, both the machines themselves and their control systems.

Section 1. main part

1.1. Toothfreather machine.

Six main ranges of gear cutters for cylindrical wheels are produced, ensuring the need for all industries.

Tooth-cutting machines for small-module wheels;

Tooth-cutting machines with vertically movable caliper;

Tooth-cutting machines with vertically movable table;

Gear-cutting machines with horizontal axis of universal part;

Toothfreather machines of high and especially high accuracy models;

Horizontal tooth-cutting machine.

Available gamma machines for the watch industry and instrument making - for the processing of small-module wheels with a diameter of 25-80 mm, universal toothfreather machines for the processing of wheels with a diameter of up to 12,500 mm, high-performance machines for the processing of parts (serial and large-scale production) with a diameter of up to 500 mm, machines with a horizontal axis of the part for milling wheel teeth together with a shaft with a diameter of up to 1250 mm and a shaft length of up to 3600 mm. On the basis of the main models of normal accuracy, machines of increased accuracy are produced. In addition, the machine-tool industry produces a range of machines of high and especially high accuracy for parts with a diameter of up to 3200 mm and master machines for cutting the teeth of dividing wheels with a diameter of up to 800 mm.

Tooth-cutting machines for small-module wheels are designed for cutting cylindrical wheels with straight teeth in the clock and instrument-making industry. Machines have horizontal arrangement with location of worm cutter axis under part axis. Machines are manufactured with increased accuracy; they provide treatment of wheels of the 6th degree of accuracy.

Tooth-cutting machines with vertically moving caliper of universal design are designed for cutting cylindrical spur, oblique and worm wheels. Machine layout is vertical.

On machines, wheels with oncoming and oncoming feeds, radial or axial notching by diagonal or axial feed, as well as a two-pass cycle with automatic notching can be processed.

With 5K310 machines, a small cone mechanism can be supplied by order.

The 5K32 machine can be ordered of increased accuracy, which is ensured by increasing the gear ratio of the dividing pair and producing all elements of the kinematic division chain according to more stringent specifications and geometric accuracy standards.

Tooth-cutting machines with a vertically moving table are designed for cutting cylindrical spur, helical and worm wheels and are suitable for insertion into automatic lines. The machines allow to work with opposite and by-pass feeding, radial or axial cutting, diagonal or axial feeding, with automatic movement of the tool after processing of each part, which allows you to choose the optimal method of tooth cutting in any production conditions. The design of the flat guides of the milling stand, caliper and table guides ensures high stability of movement and rigidity of the machines, which allows you to work at high speeds and feeds.

On the basis of the model 5306 machine, simplified drive machines are manufactured. On the basis of the 5A312 machine, modifications are made - automatic machines, machines for insertion into automatic lines, for barrel-shaped and cone-shaped teeth, for parts of the shaft-gear type.

Large-sized gear cutters are designed for cutting cylindrical gears with worm cutters, as well as disk and finger cutters by single division. Machines allow you to work oncoming and passing. Change of tool spindle speeds is controlled continuously. The machines are provided with accelerated movements of the strut, caliper and mechanical rotation of the caliper. For treatment of helical wheels in machines there is a differential.

For a special fee, a long caliper is supplied with machines, which allows you to cut worm wheels with tangential feed; an overlay head for cutting gear wheels with a finger cutter; overhead head for

cutting of gear wheels of internal engagement with finger cutter and mechanism for cutting of wheels with small taper of rim.

Gear-cutting machines with horizontal axis of universal design part are designed for cutting gear wheels with worm cutters by rolling method, as well as disk and finger cutters by single division method. Machines allow you to work with oncoming and passing feeding. On machines, spur and helical cylindrical wheels of external engagement, splined shafts, as well as chevron wheels with a disk and worm mill can be cut. Chevron wheels without grooves can be cut with a finger cutter during an automatic working cycle using a special cover head. On a 5A370 machine, with the help of special overlay heads, thread and worm cutting can be carried out.

The group of particularly accurate worm wheel machines includes the Model 543 machine, designed for the final cutting of accurate cutting worm wheels with worm cutters and chevers by rolling. The machine works by radial cutting, which can be carried out continuously or periodically. Table rotates on circular guides and has hydraulic unloading. The machine is installed on a foundation isolated from external influences. Machine kinematics are designed so that fission chain is unloaded from action of cutting forces and contains minimum number of kinematic elements.

The machine has a planetary type device for correcting cyclic and accumulated error. Total kinematic accuracy of machine division circuit without correcting device is within 5 ″ and with correcting device 1 - 2 ″.

High and particularly high precision denture machines of models 5308A and 5310A are designed for processing high-precision spur wheels. Machines operate in an automatic cycle. The machine design is highly rigid, and the design is highly accurate, which ensures high accuracy and reliability during the operation of the machine. Machines provide the 4th degree of accuracy.

Models 5362 and 3563 vertical gear cutters are designed to mill accurate cylindrical gears by rolling worm mills, straight and oblique tooth wheels and worm wheels by radial notching.

The machine table is driven into rotation from two worm separation pairs: from the large-module (for quick rotation and rough cutting) and from the small-module, operating at finishing passes; table has hydraulic unloading of guides. The speed of rotation of the tool is controlled continuously by means of a DC motor.

The Model 5371 Horizontal Gear Cutter is designed for long shaft cylindrical gear milling.

1.2. Electrical equipment of the toothfreather machine.

Toothfreather machines belong to category III of power supply. Control and monitoring elements are located on side wall of electric cabinet. The electric cabinet contains: input circuit breaker on the side wall, secondary power supply units, instrument unit, control circuit power transformers, automatic protection switches and auxiliary actuator starters, diode bridges, thyristor converter power supply circuit protectors, thyristor converters, relay boards, noise protection devices, etc.

The entire electrical equipment complex is supplied from the three-phase AC mains with frequency 50 + 2Hz, voltage 380 + 338V.

Power supply circuits, emergency protection relays, electric cabinet lighting circuits and 220V socket are connected from input circuit breaker Q1 through transformer T1. All power supply circuits are protected by circuit breakers.

The electrical equipment of tooth-cutting machines is the main movement drive: an asynchronous short-circuited motor. Feed drive: mechanical from the main motion circuit. Auxiliary drives are used for: quick movement of the bracket and rear strut, movement of the milling head, single division, table rotation, cooling pump, lubrication pump, hydraulic discharge pump (for heavy machines).

Special electromechanical devices and interlocks: a device for counting the number of cycles, automatic devices for compensating for dimensional wear of the tool.

In a number of toothfreather machines, counting devices are used. They are used on cheving machines for counting passages, on machines for preliminary cutting of gears, for counting the number of divisions and for counting the number of processed parts.

Conclusion

I would like to say in the conclusion of the course work that among the variety of equipment for mechanization and automation, as well as simplifying the work of enterprises, a toothfreather takes a special place.

The toothfreather machine greatly simplifies the working process of forming the teeth of the worm wheel, thus machines using the copying method in section and with the swinging method when cutting wheels with shaped disc or finger cutters have a simple structure consisting of two simple groups Fv (B1) and Fs (P2), as well as group D (B3).

I also sorted out all the goals and tasks of the CD set above, gave a complete concept of what a toothfreather machine is, dismantled its types and design, its often used electrical equipment and made calculations.

зубофрезерный станок.dwg