(A) the basic knowledge of metal cutting

Overview of length cutting

Classification and task of cutting and its position and function in the process of mechanical manufacturing.

Types of parts and surfaces that make up a part.

Brief introduction of technical requirements of parts (dimensional accuracy, shape and position accuracy, surface roughness).

Division of cutting stages and range of dimensional tolerance grade and surface roughness ra value in each stage.

Surface forming principle of parts and cutting motion of machine tools.

Three elements of cutting parameters and the concept of cutting layer parameters.

2. Metal cutting tools

Characteristics of cutting tool materials. Types, brands and uses of cutting tool materials.

The structure of the cutter and the composition of the cutting part. The concept of three auxiliary planes. Definition, function and selection of five main marking angles of cylindrical turning tools. The concept of tool working angle.

3. Metal cutting process and its physical phenomena

The essence of cutting process. Cut the deformation zone. Types of chips and their influence on cutting.

Physical phenomena such as chip accumulation, cutting force, cutting heat, work hardening and residual stress and their effects on cutting and reduction measures. Calculation of cutting power. Function, types and selection of cutting fluid.

The form and process of tool wear. The concept of tool durability.

4. Workpiece material machinability

The concept of machinability of workpiece materials and its improvement.

5. Ways to improve productivity

The concept of productive forces.

Calculation of maneuver time.

Ways to improve productivity. Principles of selecting cutting parameters.

(2) Turning, drilling and boring.

1. Rotate

The types of lathes, turning movements, machining ranges and workpiece clamping methods are summarized.

Methods, characteristics and applications of turning excircle, turning end face, boring, turning conical surface and turning thread.

Technological characteristics of turning.

2. Drilling machine processing

The types, drilling actions, machining range and workpiece clamping methods of drilling machines are summarized.

Methods, tools, characteristics and applications of drilling, reaming, reaming, counterboring and counterboring boss.

3. Boring machine processing

The type, composition, cutting movement, machining range and workpiece clamping method of boring machine are summarized.

Types of drilling tools. Structure, characteristics and application of floating boring cutter.

The method of boring and hole system with boring machine. Brief introduction of coordinate device of boring machine.

Technological characteristics of boring machine processing.

(3) milling, planing, inserting and pulling.

1. grinding

The types of milling machines, milling movements, machining ranges and workpiece clamping methods are summarized.

Characteristics of milling process.

Analysis and comparison of end milling and peripheral milling, reverse milling and forward milling.

Methods, characteristics and application of milling plane, spiral groove, thread, spline shaft and boring of milling machine.

2. Planing, grooving and broaching,

Cutting: Summarize the type, planing movement, machining range and workpiece clamping method of planer. Analysis and comparison of planing and milling.

Slotting: the structure of slotting tool and the method of slotting spline hole.

Broaching: the main parts, broaching action and processing range of broaching machine. Structure of broach for round hole and method of broaching round hole. Method of drawing keyway in hole. Technological characteristics and application of broaching.

(4) Grinding, finishing and less cutting.

1. grinding tool

Types of grinding tools.

Characteristics (abrasive, particle size, binder, hardness, structure, shape, etc. Bonded abrasive tools and their selection.

2. Grinding process and its phenomenon.

Essence and characteristics of grinding process.

Generation of grinding force, grinding heat, work hardening and residual stress and their influence on cutting and reduction measures.

Grinding parameters and their selection.

Grinding hole

Movement, methods, characteristics and application of common grinding and centerless grinding.

Introduction of advanced grinding methods (high precision, low roughness grinding and high efficiency grinding).

Step 4 finish machining

Methods, principles, characteristics and applications of scraping, broad knife planing, grinding, honing, ultra-precision machining and polishing.

5. Less metal and no cutting

The process methods, characteristics and applications of surface rolling finishing, thread rolling and powder metallurgy are briefly introduced.

(5) Tooth profile processing

1. Overview of involute cylindrical gears

The formation of involute and its related characteristics.

Types of gear transmission.

Calculation of main parameters and dimensions of spur gear.

Gear transmission performance. Accuracy grade and its marking method.

2. Gear milling

Method, motion and cutter number selection of milling spur gears.

The movement of milling spiral gear, the calculation of change gear, the selection of cutter number and the adjustment of machine tool.

Technological characteristics and application of gear milling.

3. Hobbing and gear forming

The main components of hobbing machine and gear shaper are divided.

Structure and accuracy of hob and gear shaper cutter.

Principle, movement, method, characteristics and application of gear hobbing and gear shaping.

4. Finishing of tooth profile

Principle, action, characteristics and application of gear shaving, honing, grinding and grinding.

(6) Selection of common surface processing schemes and technological processes for typical parts.

Basis of length selection of surface treatment scheme

2. Selection of machining schemes for external circle, internal circle and plane.

3. Selection of machining scheme for conical surface, thread and tooth profile

4. Process introduction of three typical parts: shaft, disk sleeve and bracket box.

(VII) Structural manufacturability of parts

1. Basic concept of manufacturability of parts structure

2. Machining requirements and examples of structural manufacturability

3. Assembly requirements and examples of structural manufacturability

(eight) numerical control technology and special processing

Length CNC machine tools and machining centers

Working principle, main components and applications of CNC machine tools and machining centers.