Gearbox shaft processing process

Contents

Contents Sheet

Introduction

1 General part

1.1 Justification of the form and type of production

1.2 Justification of initial procurement selection

1.3 Calculation of machining allowances

2 Process Part

2.1 Process route and selection of bases

2.2 Operational justification and description

part workpiece machining process

2.3 Calculation of cutting modes of main operations and

technical time rationing

2.4 Unit Dimension Analysis

3 Design part

3.1 Calculation of accessory

3.2 Calculation of component cutting forces

3.3 Calculation of clamping device and structural

drive parameters

3.4 Calculation of installation error

4 Conclusion

5 List of used literature

Introduction

At the current stage of development, the main tasks considered by the engineering technology are such tasks as: the creation of fundamentally new technologies that allow you to repeatedly increase productivity; transition from the development of individual machines and technologies to the development and application of technological complexes; application of automatic process design system.

The topic of coursework is the design of the process of processing the output shaft. The purpose of the course work is to consolidate the knowledge gained during the study of the subject "Engineering Technology" and acquire skills in the development of the technological process of processing the part based on them .

General part

This shaft is used in a cylindrical reduction gear and serves to transmit rotational motion.

As the initial data for the development of this course project, I was given the output shaft drawing, in this drawing I identified the following inaccuracies:

1) Surface roughness 7 and 8 is not indicated.

2) Unspecified roughness is given in Rz system.

3) Incorrect specification.

4) The quotas on the lengths of the key slots (17 and 19 surfaces) are incorrectly indicated.

5) The tolerance for the free diameter (6 surface) is too rigid.

6) The depths of the key slots (surface 18 and 20) are incorrectly specified.

7) Numerical values of deviations (all surfaces) are not specified.

8) The fillet radius (8 surface) is incorrect.

All the above mentioned drawbacks are taken into account in the revised drawing

Qualitative evaluation of processability

1) This shaft can be treated with pass-through cutters that increase processing efficiency.

2) Diametrical dimensions of shaft necks decrease to ends.

3) Indicators of base surfaces 3, 7, 13, 15 ensure accuracy of installation, processing and control.

Quantification of processability

1) Material utilization rate will be calculated in item

2) Average Part Quality

IT = (IT x n )/ n ,

where IT is the quota of surfaces;

n is the number of surfaces with the same quota.

IT = (6x4 + 9x2 + 12x5 + 14x7 )/18 = 11

3 Average part roughness

Ra = (Ra x n )/ n

where Ra is surface roughness;

n is the number of surfaces with the same roughness.

Ra = (1.25x6 + 3.2x2 + 10x10 )/18 = 6.3

The part is quite technological, it is allowed to use high-performance processing modes.

1.1 Justification of the form and type of production.

Production type - a classification category of production, distinguished by the characteristics of the breadth of the nomenclature, regularity, stability and volume of production of products.

The accepted output (N = 3000 pcs/year) corresponds to the average production (CC) type.

The production form is in-line - the designed part is produced at a specially created enterprise for this purpose. In this form, the workpiece is in motion during manufacture having a certain stroke value.

3. Calculation of machining allowances

Source Data:

Part name: gimbal joint attachment flange

Material: Steel 12XH3

Elementary surfaces for allowance calculation - external surfaces d55h9 and d50H11.

2.3 Calculation of cutting modes of main operations and

technical time rationing

The metal cutting mode includes the following elements that define it: cutting depth t, mm; supply S, mm/v; cutting speed V, m/min and number of revolutions of machine spindle n, rpm.

The allowance is divided into draft, finish and finishing. The allowance value is determined depending on the obtained during the previous treatment: the value of the defective layer; surface microgeometry; part shape errors.

The amount of feed is assigned depending on: the type of part, stiffness, strength, state of the surface layer; strength, stiffness, wear resistance of AIDS system.

The largest supply allowed by these limiting factors is accepted.

The actual supply is accepted according to the passport data of the machine closest to the design supply.

Design Part

3.1 Calculation of accessory

The main calculations of the machine tool are:

Calculation of component cutting forces;

Calculation of fixing force (s);

Calculation of clamping device and drive design parameters;

Calculates installation error, position coordinates of cutting tool guides.

Conclusion

During the course work, the technological process of processing the output shaft part was developed. On the basis of the knowledge obtained, the type of production, the structure and method of obtaining the workpiece, the technological processing route, the processing plan and the operating technology were developed and selected.

List of literature used

1. Antonyuk V.E., Korolev V.A., Basheev S.M. Designer's handbook on the calculation and design of machine tools. - Minsk: "Belarus," 1969 - 390s.;

2. Gorbatsevich A.F., Shkred V.A. Course design on mechanical engineering technology - 4th edition revised and supplemented. -Mn. High. sq., 1983256 s.

3. Anuryev V.I. Ed. I.N. Zhestkova. Reference book of the designer-mechanical engineer. T. 2. - 8th ed., Redesign. and additional. - M.: Engineering, 2001. - 901s., il.;

4. Gorbatsevich A.F., Shkred V.A. Course design in mechanical engineering technology: Text. manual for mechanical engineering. special. universities. - 4th ed., Conversion. and additional - Mn.: Vysh. school, 1983. - 256s., il.;

5. Kosilova A.G., Meshcheryakov R.K. Handbook of the technologist-machine engineer. In 2 t. T. 2. - 4th ed., Conversion. and additional - M.: Engineering, 1986. - 496s., il.;

6. Kuznetsov Yu.I., Maslov A.R., Baykov A.N. Tooling for a CNC machine: Handbook. - 2nd ed., Redesign. and additional - M.: Engineering, 1990. - 512s.: il.;

7. Panov A.A., Anikin V.V., Boim N.G. and others. Under the commonly. Ed. A.A. Panova. Cutting of Metals: Technologist's Handbook. - M.: Engineering. 1988. - 736s.: ill.; 3. Sorokin V.G., Volosnyakova A.V., Vyatkin S.A. and others. Marochnik of steels and alloys. - M.: Engineering, 1989. – 640 pages.