Earring manufacturing technology

Contents

CONTENTS

INTRODUCTION

Analysis of input data for technological development

process

Select Production Type

Selecting the Type and Method of Procurement

Selection of process bases

Establishing a Process Route

individual surfaces

Define machining allowances

Development of technological operations

Equipment selection

Selection of machine tools

Selecting a Cutting Tool

Selection of instrumentation

Calculation of modes in processing

CONCLUSION

LIST OF SOURCES USED

Introduction

Production efficiency, its technical process, quality of manufactured products largely depend on the introduction of methods of technical and economic analysis, which ensures the solution of technical issues and the economic efficiency of technological and design developments. Modern machine-building production is focused on improving the quality of machine-building products, on the widespread use of progressive structural and instrumental materials, strengthening technologies, on complex automation based on the use of CNC and CAD machines, requires the training of qualified specialists with not only deep theoretical knowledge, but also capable of practically using them in their production activities. In this course work, based on the requirements for accuracy and quality specified by the designer, reflected in the drawing of the part "Earring" (material - steel 45, overall dimensions: length 120 mm, height 60 mm, width 60mm, number of parts 150pcs is specified. manufactured per year) it is necessary to develop the most efficient machining process with the selection of equipment, tools, technological equipment, and the assignment of machining modes for the geometry-appropriate cutting parts of the tool.

Select production type.

By the volume of production of parts over the planned period of time, the type of production is determined, on which the technology of manufacturing the part largely depends. The production type can be defined by Appendix 1.

The choice of production type depends on the mass of the part and the number of machined parts.

Since m = 1.6 kg and N = 150 pc ./year, the production is small-scale.

Selection of process bases

Installation of the part in the device during machining must comply with the principles of uniformity and consistency of bases, which is necessary to ensure minimum errors in the manufacture of the part.

The workability of basing and fixing the part is characterized by the presence of supporting surfaces (bases), coincidence of technological and measuring bases, accuracy and roughness of the base surfaces.

As draft bases for the part of the earring, the surfaces of the square 60x60 are made by milling these surfaces, we get the opportunity to thread the technological base on the surface of the neck of the earring f50mm. All further machining will be done based on this single process basis and thus the maximum accuracy of the part will be achieved.

Development of technological operations

When developing technological operations, a set of interconnected tasks is solved, including selection of equipment, technological equipment and cutting tool, calculation of processing modes, calculation of time standards.

7.1 Equipment selection.

When selecting equipment, the dimensions of the machined part, requirements for the accuracy of its processing and other factors are taken into account. For earring processing we use the following equipment:

- universal milling machine 6P82,

turning-screw machine 16K20,

radial drilling machine 2M55,

in-grinding machine 3K228B

7.2 Selection of machine tools.

For machining on a universal milling machine 6P82, one uses swivel universal clips GOST 1490469, an overhead cam (it is a disc cam, the profile of which repeats the profile R30 of the earring).

To process the part on the turning-screw-cutting machine 16K20, we use a four-cam cartridge with independent cam movement GOST 389072, as well as a three-cam co-centering cartridge GOST 267580.

For machining on a drilling machine 2M55, use manual machine clips GOST 1490469.

When processing on an in-grinding machine, we use a four-cam cartridge with independent movement of the cams, GOST 389072, as well as a membrane cartridge GOST 1615770.

7.3 Selection of cutting tool.

For the treatment of the outer surfaces of the 60x60 square, we use an end cutter with mechanical attachment of hard alloy plates T5K10 f 100mm GOST2659585, an end cutter of high-speed steel f 28mm GOST 1702671, an end cutter with mechanical attachment of hard alloy plates T5K10 f 25mm GOST 2843590.

To treat the cylindrical surfaces of the shackle, to trim the end surface, we use incisors: pass-through with sound= 90 T5K10 GOST1887979, trim T5K10 GOST 1887479.

For drilling we use drills made of fast-cutting steel f30, f19.75, f24.75 GOST 203480.

To remove chamfers on the inner hole of f20mm, use countersink f25 23530106 GOST 1495380.

For processing on intra grinders we use abrasive wheels 20х40х6 25A of CM22, 16x40x6 25A CM202 of GOST 242483.

7.4 Selection of instrumentation.

When selecting instrumentation, as in the case of other technological equipment, universal standard equipment should be used first of all. Of all possible universal controls and measurements, the one that provides the lowest labour input and cost of measurement is selected.

The highest productivity in part sizing control is provided by gauge limits, which are manufactured for linear sizing control with standard tolerance fields.

Intermediate dimensions of the workpiece are controlled by special gauges or universal measuring means.

From table 1.6 ([4] p. 184) we determine the permissible measurement error: δism. = ± 10 μm = ± 0.01 mm.

Permissible error of the measuring instrument:

[Δ] < 0.8 (δism.) = 0.008 mm.

the last condition is satisfied by the permissible error of the SCR caliper (Δ = ± 0.05 mm).

Openings f20n8 (the admission of 33 microns), f25n7 (the admission of 21 microns), require application of a nutromer of indicator 18501 GOST 86882.

Requirements for perpendicular of slot 32N12 and coaxiality of holes f25N7 are checked by means of rod rail SHR2500.02 GOST 16490.

Conclusion

In this course work, the technology of making an earring is considered.

During the work, an analysis of the applicability of the earring is presented, and the part is also considered from the point of view of processability. Based on the analysis, a table of dimensions indicating tolerances and limit deviations is given.

1. Based on the technical and economic analysis of production, it was found that the most economical method of producing blanks for the manufacture of 150 pieces of parts is hot stamping.

2. The course project has developed a rational routing process for cutting the part "Earring"

3. The necessary process documentation has been developed to ensure the cutting process of the "Earring" part.