Cutting Tool Course Project

Contents

Contents

Introduction

1 Shaped Cutter Calculation

1.1 Defining Part Profile Point Coordinates

1.2 Determine the coordinates of the part profile points in order of their location relative to the base end

1.3 Auxiliary values

1.4 Overall and connecting dimensions of the cutter

2 Calculation and design of rails

2.1 Initial data

2.2 Calculation Procedure

3 Calculation of tooth-cutting shank

3.1 Initial data

3.2 Calculation procedure

Summary

Steniin D.V., Cutting Tool Calculation and Design.

Trekhgorny: TTI NIYAU MEPhI, group 5TMS37, 2020. Explanatory note - 102 sheets, bibliographic list - 3 titles, drawings of A3 format - 3 sheets.

The course project includes the calculation of metal cutting tools.

Defines the coordinates of the profile points of a part machined by a circular shaped cutter, as well as the parameters and overall and attachment dimensions of the cutter itself.

Defines the parameters of the round drawing, with the creation of a table of dimensions of all its teeth.

Defines the parameters of the tooth-cutting tool - shingle.

After completion of calculations, drawings of cutting tools are made according to the task for heading work.

Introduction

Most machine parts are finally shaped and dimensioned by machining on metal cutting machines with various cutting tools.

An extremely large number of various cutting tools are used in industry (cutters, curls, milling mills, grinding wheels, etc.), which is caused by the desire to ensure high labor productivity when processing parts of various shapes and sizes. Therefore, changing the shapes of parts, designing new machine designs, and increasing the number of products required necessitates the creation and application of new and new types of tools in industry. The selection of a particular tool is made during the development of the manufacturing technology of the workpiece and depends on the purpose and operating conditions of the machines, their design features and technical requirements for them, on the production capabilities of the workshop, as well as on the given production program.

The design of metal cutting tools includes the following main issues:

1. Specifies the tool assignment area based on the cutting mode.

2. The necessary tool material for the cutting part and structural steel for the body and fastening part of the tool are reasonably selected.

3. From the conditions of strength, stiffness of the tool and volume of chips, its main design parameters are determined. From the cutting condition, the optimal geometry of its cutting part is accepted or experimentally established.

4. The required tool profile is located.

5. The method of overflow and errors arising from this is determined, as well as the possibility of its adjustment by size.

6. Taking into account the accuracy of manufacturing parts, tolerances for the dimensions of the tool are assigned, specification for its manufacture and quality are indicated.

The link is designed to process holes already made, to give them various shapes.

Tooth-cutting bits are used to cut spur and oblique wheels with external and internal teeth, as well as wheel blocks. They belong to disk-type tools, since their design is based on the producing wheel.

Shaped cutters are used as the main cutting tool for machining shaped parts.

2 Calculation and design of rails

2.1 Initial data

1. Extensible workpiece: material - steel 45; hardness at drawing of HB ≤ 229; Procurement after issue the pull hole is machined; hole diameter before drawing D0 = 73.2H9 (+ 0.074) mm; hole diameter after drawing D = 75H7 (+ 0.03) mm; surface roughness parameter Ra ≤ 2.5 mcm; pull length L = 170 mm.

2. Machine: horizontal, model 7A540; machine traction force Q = 408 kN; maximum rod travel length Lmax = 2000 mm; range of operating speeds 1.5... 6.8 m/min, machine condition - satisfactory; pulling is fixed in quick-change automatic cartridge.

3. The nature of production is massive.

2.2 Calculation Procedure

1. We set up a handling group using Annex 1. Steel 45 with hardness HV ≤ 229 belongs to 1 workability group.

2. We set the quality group according to Annex 2 depending on surface roughness and hole quality. We accept 2 quality groups.

3. The material of the working part of the pulling is quick-cutting steel P6M5 (Appendix 3).

4. We accept the design of the drawing, the material of the shank is steel 45, the size according to GOST 4044-70 or according to Appendix 4. Front shank diameter Dxv = 70 mm, Fop = 2206.9 mm2 .