Upgrade of Longitudinal Milling Machine 6610

Contents

Introduction

1Technical Specifications

1.1 Dimensions

1.2 Machine mechanics

2 Calculation of cutting modes

2.1 Determination of actual frequency values

3 Definition of initial design data

4 Kinematic calculation of speed box

4.1 Structural Grid and Speed Chart

4.2 Determination of gear gear numbers

5 Power calculation of speed box

5.1 Calculation of speed box efficiency

5.2 Calculation of electric motor power demand

and transmitted power on shafts

5.3 Calculation of shaft speeds

5.4 Calculation of torques

5.5 Calculation of gear module

6 Calculation of speed box elements

6.1 Calculation of geometrical parameters of gears

6.2 Preliminary calculation of shaft diameters

6.3 Spindle Design Selection

6.4 Calculation of forces acting on spindle

6.5 Check calculation of spindle bearings

6.6 Calculation of spindle for stiffness

7 Description of speed box design

8 Machine lubrication system

Conclusion

Literature

Application

Application

Application

Application

Task

for a course project

in the discipline "Equipment of machine-building production"

THEME: "Upgrade Model 6610 Longitudinal Milling Machine"

Development direction: Upgrade the drive of the main movement of the longitudinal milling machine and design the speed box assembly with automatic frequency control (electromagnetic couplings).

Provide a number of technical requirements to ensure the temperature of crankcase oil of the unit operating under load of not more than 50 0С.

Initial data: accuracy class of machine H; treated material steel 12X18H9;

Project Sheets: 1. Machine diagram with its main characteristics; 2,3.

Assembly and mechanism designs (convolution and unfolding) 4. Working drawing

parts (spindle shaft).

Explanatory note: Calculation of technical characteristics of the machine with detailed description of the speed box device.

Summary

A course project on equipment of machine-building production of a student of gr. B077211V Tudanova.V.I.

Explanatory note on p., including il.; drawing sheet.

In the course design, according to the task, the modernization of the drive of the main movement longitudinally milling machine model 6610 was carried out.

The kinematic diagram of the drive and a graph of the spindle rotation speeds have been developed. When developing the project, various methods for achieving the task were considered, as a result of the analysis, the method "frequency control technology using electromagnetic couplings" was recognized as the most rational. This method made it possible to automate some parts of the machine, due to the use and introduction of electromagnetic couplings into the speed box.

The missing parameters for calculating the strength and rigidity of the shafts and spindle are determined. Bearings were calculated, structural elements of individual parts were determined.

The calculation and description of the speed gearbox lubrication system are made, the lubrication system diagram is given, the lubricants used are indicated.

In the graphics part:

- Drawing of the main view and kinematic diagram of the machine is made;

-Developed mechanism with automatic frequency control;

-Developed drawing of kinematic diagram of electromagnetic couplings;

Introduction

The longitudinal milling machine 6610 is designed to process the planes of the large parts. Two vertical posts are mounted on the bed of these machines. On vertical guides of which there are two milling heads with horizontal axis of spindle and crossbeam. Two milling heads with vertical axis of rotation are installed on guides of cross-arm.

The need to change the old design of the speed box is due to the increasing requirements for machine units (increased frequencies and speeds) due to the introduction of new high-strength cutters and new high-performance technological processes.

When designing, we will strive to develop a design with the maximum possible accuracy of transmission ratios and minimum dimensions of the unit, the use of possible cheapest materials, ensuring repairability and reliability, simplicity of design and operation.

Technical specifications

Model 6610 machines are designed for the processing of parts from ferrous and non-ferrous metals by milling methods, in single, small-scale and mass production.

Dimensions:

height - 4075mm, width - 4360mm, length - 10790mm; weight - 39150kg;

Largest workpiece size:

width - 1000mm, height - 1000mm, length - 4000mm; table travel length - 4555 mm;

The distance between the posts is 1350mm;

The distance between the ends of the horizontal spindles is 870-270mm;

The distance from the working surface of the table to the end of the vertical spindle is 40-1168mm;

Distance between axes of vertical spindles - 440-1900mm;

Distance from table surface to horizontal spindle axis is 0-900mm;

Number of T-shaped slots - 5;

The width of the slot is 400mm;

The largest design diameter of the cutter is 400 mm;

The mounting diameter for the cutter on the spindle is 128.57mm;

Spindle hole cone - No. 3 (GOST 83662);

The largest rotation angle of the spindle head is + -300;

The largest movement of pinoli is 200mm;

The largest weight of the workpiece per 1 linear meter of the table is 2000 kg;

The largest weight of the workpiece is 8000kg;

Machine mechanics.

The number of spindle speeds is 16;

The number of spindle revolutions per minute is 25-800;

Feed, mm/min: table - 20-2000, milling head - 20-1250;

Speed of quick setting movement, mm/min:

table - 3200, milling head - 1500;

Speed of slow installation movement of table and milling head, mm/min - 20;

Power of electric motors of the main motion drive, kvt - 13x4.

Description of speed box design

The speed box mechanism is located in the housing cast from gray cast iron of grade CH20.

The box consists of 5 shafts and a spindle, on which gear wheels and gear blocks are fitted, transmitting movement from the input shaft Iii to the spindle VI. Shafts I - V are installed on radial ball bearings (there is no axial load). To increase the rigidity of the shafts, the supports are as close as possible. To transfer the necessary torques, the gear wheels are installed on the shafts using splined joints and are locked from axial displacement by spring lock washers, blocks of mobile gear wheels are installed on splines. To prevent contamination of the box and leakage of lubricant from the unit, seals are used - rubber rings of a round section and cuffs.

In the front support of the spindle assembly there is a radial two-row roller bearing of type 3182100 and two thrust bearings of type 8000, in the rear - one bearing of type 3182100.

Protection of bearings of spindle assembly against dirt, dust and moisture is provided by slotted seals.

Gear wheels are made of steel of grades 40X and 40XN, respectively, with thermal treatment, improvement (230... 260 HV) and hardening (48...... 54 HRC).

Speed switching is controlled by a mechanism with a preliminary set of the speed value, which allows you to prepare the next switching on (without violating the previous frequency) and at the right time use the handle to quickly perform this switching. Preliminary selection of feed value is performed by limb rotation. The limb rotates the twin discs using a conical transmission. Handle by means of toothed sectors and levers shifts disks, which move sliders through pins with forks entering slots of movable gear blocks. In the drawings of the scanning and control mechanism, the position of the movable gear blocks and forks corresponds to the rotation speed of the spindle n12 = 400 min -1.

Units are fixed by means of spring-loaded balls.

Lubrication to gears and bearings is supplied by the pump through tubes (not shown in the box).

Conclusion

In this course project on machine-building equipment, we reviewed and modernized the 6610 machine according to the task.

A kinematic drive diagram and a spindle speed graph were developed. When developing the project, various methods of achieving the task were considered, as a result of the analysis, the most rational method of modernizing the machine was chosen. This method made it possible to automate some parts of the machine, due to the use and introduction of electromagnetic couplings into the box.

The missing parameters for calculating the strength and rigidity of the shafts and spindle are determined. Bearings were calculated, structural elements of individual parts were determined.

The calculation and description of the speed gearbox lubrication system are made, the lubrication system diagram is given, the lubricants used are indicated.