Modernization of machine feed drive 6p13

Contents

Introduction

1 Description of the developed structure and kinematic diagram

2 Calculation of cutting modes

3 Kinematic calculation of feed box

4 Design calculation of feed box

4.1 Determination of design loads 13 4.2 Design calculation of gears

4.2.1 Selection of materials and heat treatment

4.2.2 Definition of allowable stresses

4.2.3 Sizing Gear Gears

4.2.4 Check calculation of spur gear

4.3 Calculation of shafts

4.3.1 Calculation of shaft for fatigue strength

4.3.2 Calculation of shaft for static strength

4.4 Selection and calculation of bearings

4.5 Calculation of key connection

4.6 Calculation of splined connection

5 Description of the control system

6 Lubrication system

7 Safety and Environmental Measures

List of sources used

Application

Introduction

Modern metal cutting machines are very advanced machines that include a large number of mechanisms and use mechanical, electrical, hydraulic and other methods of movement and cycle control.

Modern machines provide high performance due to speed, power and wide automation. In modern heavy machines, the power of only the main motor reaches 150 kW, and only a few dozen electric motors are sometimes installed on one machine. The weight of unique machines reaches several thousand tons.

In design, various mechanisms using hydraulics, electrics, pneumatics are used to give the machine the required qualities and functions; They also use details of complex structural forms with high requirements for their quality indicators, introduce progressive design principles (aggregation, unification); search for the most rational layout of machines, develop new cycle control systems.

Along with the development and improvement of existing processing methods in recent years, machines have appeared on the basis of fundamentally new technological processes. Such processes include electroerosion processing, electrochemical processing methods, high-energy focused beam treatment, high-pressure thin jet treatment, ultrasonic method, and other methods.

Thus, the machines, which are referred to as metal cutting machines, include a wider group of machine tools that process not only metals but also other materials by various methods.

In order to perform such a variety of technological tasks with high requirements for product quality and processing performance, the latest engineering advances must be used in machine design.

Description of the developed structure and kinematic diagram

The machine is designed for milling various parts of relatively small sizes mainly with end and end cutters in individual and serial production conditions. The presence of a rotary head allows processing of inclined surfaces.

The workpiece is fixed directly to the table, in machine clutches or special devices installed on the machine table.

Nozzle cutters are fixed on cantilever or support mandrels. To support the mandrels, a trunk with central and end suspensions is used. Tail cutters are fixed directly in spindle cone or collet cartridge. End milling heads are installed and fixed on spindle end face.

Movements in the machine. Cutting Motion-Rotates a spindle with a mill. Feed movements - longitudinal, transverse and vertical translational movements of the table. Auxiliary Movements - All specified table movements that are performed on a fast run or manually.

Description of the control system.

To switch the feed, it is necessary to move two triple gear blocks and one coupling. The feed box is controlled by a mechanism that works according to the following principle.

Switching of blocks located on the same shaft is carried out by means of a control handle, which during rotation rotates the shaft, which in turn is a toothed sector fixed on the shaft. Rotation of the sector is transmitted to a toothed rack, on which a fork is fixed, transmitting the movement of the toothed unit along the shaft.

Lubrication System Description

The speed box lubrication system provides for supply of the required amount of lubricant to rubbing vapors, its distribution over the entire working surface, cleaning of lubricant.

The lubrication system of the designed unit is part of the entire machine lubrication system. Lubrication of the machine is provided by the following systems:

- circulation

- packing.

The circulating system carries out lubricant of a box of speeds, giving, the mechanism of giving, the plunger pump, oil indicators. Plunger pump is attached to lower plate of speed box housing and is actuated by eccentric secured on speed box shaft. The oil supplied by the pump is supplied through the pipes in which the slots are made, to the gears, shafts, bearings of the speed and supply boxes, the drill head, then flows back to the oil tank.

Lubrication of spindle bearings, speed gearbox drive bearings, motor bearings and electric pump bearings is performed by packing with "TSIATIM 201" grease.

To maintain the lubrication system, fill the oil tank to the level of the lower oil indicator with "Industrial 20A" oil. The oil level should be checked by the red point of the oil indicator before the machine starts or after its shutdown in 10 - 15 minutes (after the oil drains to the tank). During normal operation of the pump oil must continuously enter the control eye. It is recommended to change oil for the first time after 10 days of work, for the second time after 20 days, and then every three months. Check lubrication system also every three months.