Design of CNC Metal Cutting Machine Drives Based on Model 6M12PB Machine

Contents

Content of calculation and explanatory note

Basic Machine Main Motion Drive Structure Analysis

Brief description of the purpose and main technical characteristics of the base machine.. c.4-

Construction of structural grid of the main motion drive of the base machine.. c.5-

Plot the speed of the main motion drive of the base machine... c.6-

Design of NC Metal Cutting Machine Drive Structure

Development and brief description of the structure of the drives of the designed machine... c.7-

Selection of the motor of the main drive with stepless speed control, justification of the need for the speed range selector box and calculation of the number of stages of the gear.s.9-

Plot spindle speeds... c.10-

Calculation of gear ratios, pulley diameters and gear numbers..... c.14-

Strength calculations for NC Metal Cutting Machine Drive Speed Range Switch Box Design

Calculation of gear module by bending strength condition and by permissible contact stresses .s.21-

Approximate calculation of drive shaft diameters.. p.23-

Calculation of the shaft selected by agreement with the manager for complex resistion.29 -

Calculation and selection of shaft bearings for the calculated shaft .s.30-

Calculation of splines and keyways for the calculated shaft.

Conclusions and conclusions.... with

Bibliographic list... with

Appendix..... p.33-

Basic Machine Main Motion Drive Structure Analysis

Brief description of the purpose and main technical characteristics of the base machine

The 6M12P cantilever machine replaced the obsolete 6N12P model in production and was replaced with a more advanced 6P12 model.

Vertical cantilever cutters of models 6M12P and 6M12BP are electrified machines with high accuracy and rigidity.

Cantilever-milling machine 6M12P is designed for milling all kinds of parts made of steel, cast iron and non-ferrous metals with end, cylindrical, end, radius milling cutters in individual and serial production conditions. In mass production, thanks to the presence of semi-automatic and automatic cycles, machines can be successfully used in operations of an operational nature in flow and automatic lines.

On 6M12P machines, vertical and horizontal planes, slots, angles, gear wheels, etc. can be machined. Milling of gears, turns, spirals, contours of cams and other parts requiring periodic or continuous rotation around their axis is carried out on these machines on the use of a dividing head or an overhead round table.

Due to the presence of the play selection mechanism in the helical pair of the longitudinal supply of the table, counter and parallel milling can be carried out on the 6M12P machine, both in simple modes and in modes with automatic cycles.

The most efficient use of the machine is achieved when machining parts using high-speed milling

Design of NC Metal Cutting Machine Drive Structure

2.1 Development and brief description of the structure of the drives of the designed machine

The drive of the main movement of the machine, which is being upgraded in this project, will be equipped with an asynchronous electric motor with a frequency converter. Speed adjustment of the spindle rotation will be carried out by a modernized gearbox. The purpose of the project is to modernize the machine, the speed box will be combined with the spindle head, as in the base machine 6M12PB.

Modernization of the drive of the main movement of the machine consists in restructuring the existing drive structure by changing the gear ratios between the gears and preserving the structural and standard elements of the base machine. Due to stepless control, the number of gears and, accordingly, gears is reduced, the values ​ ​ of the control frequencies will be located in the calculated range.

Conclusions and conclusions

In course work, work was carried out to modernize the drive of the main movement of the 6M12PB machine. The rebuilt gearbox received 3 horizontal shafts with changed axial distances. Basic bearings used. The frequency control range fully satisfies the project specification. Shafts and wheels are designed taking into account their strength requirements.