The machining technology of the tacho disc parts and the design of the fixture of the 2 9 process to

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First, the basic principles of tooling and fixture design.

1. Meet the stability and reliability of workpiece positioning in the process of use;

2. There is enough bearing or clamping strength to ensure the processing process of the workpiece on the tooling fixture;

3. Meet the simple and fast operation in the clamping process;

4. The wearing parts must be a structure that can be quickly replaced, and it is best not to use other tools when the conditions are sufficient;

5. Meet the reliability of repeated positioning of the fixture in the process of adjustment or replacement;

6. Avoid complex structure and expensive cost as much as possible;

7. Use standard parts as components as much as possible;

8. Form the systematization and standardization of the company's internal products.

Second, the basic methods and steps of tooling and fixture design.

1) Design notice, finished parts drawing, blank drawing and process route and other technical information, understand the processing technical requirements of each process, positioning and clamping scheme, the processing content of the previous process, the blank situation, the machine tools, tools, inspection measuring tools, machining allowance and cutting amount used in the processing, etc.;

2) Understand the production batch and the need for fixtures;

3) Understand the main technical parameters, performance, specifications, accuracy and contact size of the part of the structure connected with the fixture of the machine tool used;

4) The inventory of standard materials for fixtures.

The three elements of the design of machining fixtures are: the fixtures should have sufficient strength and rigidity, the reliability of clamping, and good manufacturability.

When positioning using a hole that has been machined in the previous process of the workpiece, it is necessary to use a pin with tolerances for positioning. Through the accuracy of the workpiece hole and the accuracy of the pin shape, the combination is carried out according to the fit tolerance, so that the positioning accuracy can meet the actual requirements.

In addition, when using the pin positioning, generally one uses a straight column pin and the other uses a diamond pin, so it will become more convenient to assemble and disassemble the workpiece, and the workpiece and the pin will rarely be stuck.

1.The basic requirements for fixture design.

1）.The fixture should have sufficient strength and rigidity.

2).Clamping reliability.

3) Good manufacturability.

2. The basic methods and steps of tooling and fixture design.

1) Preparation before design.

1. Fixture design task list.

2. Several technical conditions of the workpiece drawing.

3. The assembly process specification of the workpiece.

4. Technical conditions for fixture design.

5. Standardization of fixtures and standardization of specifications, including national standards, factory standards and standardized structure drawings, etc.

2) Design steps.

1.Determine the fixture structure scheme.

2.Drawing the general working diagram of the fixture stage.

3.Drawing the assembly weld fixture part drawing stage.

4.Prepare the design specification for the assembly welding fixture.

5.If necessary, it is also necessary to prepare the instruction manual of the assembly welding fixture, including the performance of the tool, the precautions for use, etc.

3) Accuracy requirements for tooling and fixture manufacturing.

1.The first type is to be in direct contact with the workpiece and strictly determine the position and shape of the workpiece, mainly including the positioning parts of the joint, V-block, positioning pins and other positioning elements.

2.The second category consists of various guides, which determine the position of the first type of element, although they are not in direct contact with the positioning workpiece.

3.The third type belongs to the fixture elements that the internal structure parts of the fixture are matched with each other, such as the fitting size tolerance between the components of the clamping device.

4.The fourth category does not affect the position of the workpiece, nor does it cooperate with other components, such as the main skeleton of the fixture.

4) Fixture structure manufacturability.

1) The basic requirements for good manufacturability of fixtures.

1.The composition of the overall fixture structure should be as much as possible to use a variety of standard parts and general parts, and the proportion of manufacturing special parts should be as small as possible, so as to reduce the amount of manufacturing labor and reduce the cost.

2.The structural shape of various special parts and components should be easy to manufacture and measure, and convenient for assembly and commissioning.

3.It is convenient for the maintenance and repair of fixtures.

2) Reasonable selection of assembly standards.

1.The assembly datum should be an independent datum surface or line on the fixture, and the position of other components is only adjusted and repaired on this surface or line.

2.Once the assembly datum has been machined, its position and dimensions should no longer be changed. Therefore, surfaces or lines whose position and dimensions have to be adjusted or repaired during the assembly process cannot be used as assembly references.

3.Adjustability of the structure.

It is often used to rely on bolt fastening and pin position, and when adjusting and assembling fixtures, it is convenient to grind a certain element size. It can also be used to set an adjustment washer between components, adjust a gasket or an adjustment sleeve, etc. to control the assembly size, compensate for the error of other components, and improve the accuracy of the fixture.

4.Maintenance manufacturability.

When designing the fixture, the problem of ease of maintenance should be taken into account.

There are three elements of process cutting: 1. Machining speed 2, processing amount 3, and tool pass.

Annotate three elements: 1, dimension 2, dimension line 3, dimension line.

There are three elements of tooling design: 1, benchmark 2, size 3, clamping.

Meet the requirements, easy to disassemble, assemble and unload, and small deformation.