Assembly fitter

post standard of locksmith's technical level

I. definition of occupation

using locksmith tools and drilling machines to process, trim and assemble workpieces according to technical requirements.

II. Scope of application

Manufacture, marking, scraping and assembly of parts; Operation and maintenance of special equipment such as vertical drill, rocker drill and bench drill.

III. Technical grade line

Primary, middle and high grade

Primary fitter

I. Knowledge requirements

1. Name, model, specification, performance, structure and transmission system of self-use equipment.

2. Lubrication system, usage rules and maintenance methods of self-use equipment.

3. Names, specifications, uses, usage rules and maintenance methods of commonly used tools, clamps and measuring tools.

4. Types, brands, specifications and performance of commonly used tools; Influence of tool geometry parameters on cutting performance; Reasonable selection of cutting parameters and methods to improve tool life.

5. Types, brands, mechanical properties, cutting performance and knowledge of thermal expansion during cutting of commonly used metal materials; Common sense of metal heat treatment.

6. Types and uses of common lubricating oils; Types and uses of common cutting fluids and their effects on surface roughness.

7. Basic knowledge of mechanical drawing, tolerance fit, form and position tolerance and surface roughness.

8. Common mathematical calculation knowledge.

9. Basic knowledge of mechanical transmission and typical mechanism.

1. Basic knowledge of hydraulic transmission and pneumatic transmission.

11. Basic knowledge of locksmith's operation and assembly.

12. Structure, transmission and indexing method of indexing head.

13. knowledge of determining machining allowance of parts.

14. Types and usage of jig.

15. knowledge of the structure and use of quick-change chuck and tapping chuck.

16. the relationship between the types and uses of threads and the dimensions of each part; The method of determining the diameter of thread bottom hole and the diameter of round rod when threading.

17. Scraping knowledge; Principle and method of scraping original flat plate.

18. Grinding knowledge; Types of abrasives and preparation methods of abrasives.

19. Correction and bending methods of metal bars and plates.

2. Types, uses, dimensions of each part of the spring and methods for determining the force.

21. Causes of waste products and preventive measures.

22. General process knowledge of related jobs.

23. General knowledge of electricity and safe use of electricity; Components and uses of machine tool electrical devices.

24. Safety technical regulations.

2. Skill requirements

1. Use and maintain self-use equipment.

2. Select and maintain all kinds of tools, clamps and measuring tools for personal use.

3. Grinding of various cutter heads and drills; Quenching and sharpening of scraper, chisel, sample punching, needle marking and gauge marking.

4. Understand the part drawings and assembly drawings, draw simple part drawings, and correctly implement the process regulations.

5. Selection of datum plane for general workpiece scribing and installation of workpiece during scribing.

6. according to the workpiece materials and tools, select reasonable drilling parameters.

7. Installation of general workpieces on general and special fixtures.

8. The surface roughness of the reamed surface reaches Ra1.6 for scribing, drilling, tapping and reaming (the contact area of the tapered hole is more than 7% by coloring method). m。

9. scrape the flat plate with grade 2 accuracy.

1. Make angle template and simple arc template.

11. coil all kinds of springs with wire diameter less than 3mm.

12. Assembly of parts of general machinery and general assembly of simple machinery (hoist, electric hoist, etc.).

13. correctly implement the safety technical operation procedures.

14. meet the requirements of post responsibility system and civilized production.

III. Working examples

1. There should be no obvious deviation when tapping the screw hole below M2.

2. scraping both planes is 35mm? 25mm right-angle iron (bending plate), the accuracy reaches level 2.

3. Make a positive six-force analysis plate (assembly) with a gap of not more than .5mm, which can relatively exchange directions.

4. Will? 5mm? The 5mm round bar file is cut into a regular hexahedron. The tolerance zone of basic size is h8, the tolerance value of flatness and verticality is .4mm, and the surface roughness is Ra1.6? m。

5. eight reamers are drilled on the same circumference of the steel plate with a thickness of 2mm? For equally divided holes of 16H8, what is the tolerance value of the position of each hole? .2mm, and the surface roughness is Ra1.6? m。

6. The processing and assembly of the tailstock of the horizontal lathe or the assembly of the slide box meet the technical requirements.

7. The general assembly of simple machinery such as hoist or electric hoist meets the technical requirements.

Intermediate fitter

1. Knowledge requirements

1. Name, purpose, use and maintenance methods of commonly used measuring instruments.

2. Structure, use, adjustment and maintenance methods of common tools and fixtures (including combined fixtures).

3. Basic knowledge of metal cutting principles and tools.

4. Basic knowledge of hydraulic transmission.

5. knowledge of drawing complex part drawings and simple assembly drawings.

6. Working principle and structure of general mechanical equipment (pumps, fans, freezers and typical machine tools, etc.).

7. Principle and structure of internal combustion engine.

8. Basic knowledge of compiling mechanical equipment assembly process specification.

9. scribing method for complex workpieces (including large and deformed workpieces).

1. Types and uses of cams, calculation of dimensions of each part and marking method; Marking method of curve; Expansion method of cone and polyhedron.

11. Balance types, basic principles and correction methods of rotating parts and components.

12. knowledge of babbitt alloy casting for bearing bush.

13. Method of assembling precision sliding bearing and rolling bearing.

14. Quality requirements and inspection methods of gear box assembly.

15. Factors affecting the accuracy of general machinery, methods for checking the accuracy, and factors affecting the measurement accuracy.

16. Influence of machine tool accuracy on workpiece accuracy, and methods to improve workpiece machining accuracy and refine surface roughness.

17. working principle, structure and application knowledge of hydrostatic guide rail and hydrostatic bearing.

18. Methods to prevent deformation of workpieces when machining them.

19. Basic knowledge of CNC machine tools.

2. General machine tool processing knowledge, general workpiece processing process.

21. Production technology management knowledge.

second, skill requirements

1. understand more complex assembly drawings and map complex parts drawings.

2. Work out the processing technology according to the technical requirements of the workpiece.

3. Design and draw a simple process equipment diagram.

4. Drilling small holes, inclined holes, deep holes, multi-holes, butt holes and intersecting holes on complex workpieces meets the requirements of the drawings.

5. Three-dimensional scribing of workpieces with complex shapes.

6. Grind the inspection mandrel with taper and the spindle hole of high-precision machine tool, and the contact quality, accuracy and surface roughness meet the technical requirements.

7. according to the technical requirements of mechanical equipment, compile the assembly process sequence.

8. Dynamic and static balance of rotating parts and components.

9. Conduct performance tests of various hydraulic components on the hydraulic test bench.

1. Assemble compressors, air hammers, presses and high-pressure pumps to meet the technical requirements.

11. Assemble typical machine tools and check the accuracy.

12. according to the quality of the workpiece and the operation of the machine tool, distinguish whether the machine tool works normally.

III. Working examples

1. Scraping the level ruler or bridge-shaped level ruler with the length of 15mm, the accuracy reaches level 1.

2. The marking and manufacturing of the disc cam meet the technical requirements.

3. Draw the processing line for the shell and blade of Roots blower.

4. Drilling of complex hydraulic valve body (such as control box).

5. drill and ream three 62mm holes in the same plane on a steel plate with a thickness of 2mm, with a center distance of 1mm and a surface roughness of Ra3.2? M, the tolerance value of position is? .1mm。

6. Assemble the horizontal lathe, which meets the technical requirements.

7. Assemble the guideway grinder to meet the technical requirements.

8. assemble a 7.36kW diesel engine, which meets the technical requirements.

9. Machining of workpieces with corresponding complexity and assembly of parts.

Senior fitter

1. Knowledge requirements

1. Working principle of precision measuring instruments.

2. Principles of common mechanical parts and various mechanisms

3. Working principles and structures of complex and high-precision mechanical equipment.

4. Quality inspection and appraisal methods for new products after assembly.

5. The process of machining complex workpieces and the compilation method of assembly process specification for precision and complex mechanical equipment.

6. Various extrusion processing methods.

7. Basic knowledge of machine tool electrical control.

8. knowledge of hydraulic transmission.

9. Basic knowledge of improving productivity.

1. Basic knowledge of microcomputer application.

second, skill requirements

1. design advanced process equipment, draw process equipment drawings, and prepare assembly process regulations.

2. Put forward suggestions for improvement of the technological procedures for processing key parts.

3. In the trial production of new products, qualified parts are processed according to the technical requirements of difficult parts.

4. Grinding workpieces with high precision and complex shapes.

5. Solve the technical problems in fitter's operation and assembly, and assemble large, precise, complex and high-speed mechanical equipment.

6. Assemble the new product according to the drawing, which meets the technical requirements; Assemble and adjust program-controlled and CNC machine tools.

7. Understand the mechanical and electrical schematic diagram.

8. apply and popularize new technologies, new processes, new equipment and new materials.

3. Work examples

1. Grind the workpiece with high precision and complex shape, with tolerance level of lT4 and surface roughness of Ra.5? m。

2. The processing of parts with high precision and complex shapes meets the technical requirements.

3. Assemble the gear grinder, which meets the technical requirements.

4. Assemble a large high-speed internal combustion engine, which meets the technical requirements.

Assembly and adjustment of new mechatronics equipment such as program-controlled machine tools and numerical control machine tools.