Basic principles of fixture design\x0d\1. Meet the stability and reliability of workpiece positioning during use;\x0d\2. Have sufficient load-bearing or clamping strength to ensure that the workpiece is on the tool fixture The construction process being carried out;\x0d\3. Meet the simple and fast operation during the clamping process;\x0d\4. The wearing parts must be structures that can be quickly replaced. When conditions are sufficient, it is best not to use other tools;\x0d\4. x0d\5. Meet the reliability of repeated positioning of the fixture during adjustment or replacement;\x0d\6. Avoid complex structures and expensive costs as much as possible;\x0d\7. Try to use standard products with reliable quality on the market for composition. Parts; \x0d\8. Meet the safety laws and regulations of the country or region where the fixture is used; \x0d\9. The design follows the principle of priority selection of manual, pneumatic, hydraulic, and servo; \x0d\10. Form a series of internal products of the company ization and standardization. \x0d\Inspection fixture design requirements\x0d\A: As a control over the design, the designer should refer to the concept sketch and its written description (inspection fixture specification book). \x0d\B: It is best for all drawings to be 1:1 in size with the entity, and the dimensions can be accurately marked. In addition:\x0d\1. All inspection tool parts drawings must be drawn in three views, and the completed work surface and/or body and/or work\x0d\ reference lines must be marked. \x0d\2. All section drawings should be marked with the section number and page number corresponding to the reference number of the measuring tool design drawing. \x0d\3. The design drawing of the inspection tool must include the outline (dashed line) of the part being tested on the inspection tool. The lines should be thick enough to facilitate the copying of the drawing. \x0d\4. The raw material list of inspection tools should include the dimensions of the raw materials, and all standard parts should be marked with the manufacturer's name and its catalog model. \x0d\5. Unless to clarify manufacturing requirements, the parts drawing of the inspection tool should be separated from the assembly drawing. \x0d\6. All dimensions should be expressed in metric system. \x0d\7. If possible, the raw materials of inspection tools (such as angle frames, stacking blocks, hinges, guide plates, screws and keys, etc.) should be purchased as standard parts as possible. \x0d\8. The design of inspection tools uses computer-aided design. \x0d\9. There is no need to indicate conventional manufacturing notes on the inspection tool design drawing. (For example: the size of cable joints, screws or keys, etc.) \x0d\10. It is not necessary to mark duplication or left-right symmetry in the inspection tool design drawing. When practical, only the unique, single\x0d\ side must be marked. Only the details are enough, and add the note "Symmetrical to the central axis except for the parts indicated". \x0d\C: When selecting materials, guide plates, pin chucks, etc., the use environment of the inspection fixture should be considered to ensure that the inspection fixture maintains its original functions during the validity period of current production. \x0d\D: The positioning datum scheme must be applied in the design drawings of the inspection fixture and on the inspection fixture. The general concept is: position the tested part on the first positioning surface, the second positioning surface, and the third positioning surface (Note: 6-point positioning principle) in the three-dimensional space composed of. \x0d\E: Positioning device for positioning datum holes: \x0d\1. Selection of gage positioning datum: The positioning datum scheme should be consistent with the geometric dimensions and tolerance drawings (GDamp; T). Or mold, \x0d\ clamp, inspection tool MCP consistency principle. \x0d\2. Reference hole positioning method: implantable or inserted. \x0d\F: Pay attention to the positioning datum adjacent to spot welding, seam welding or parting surface. If these positioning datums cannot be migrated, in order to facilitate the repeatability and reproducibility analysis of the gage, the datum parts of these gage must have a certain gap from the spot welding, seam welding or parting surface (Note: open on the positioning datum. slot or hole). \x0d\G: In the design of the gage, each gage part used in the inspection of the parts to be tested should be determined, including the size of the measuring pin. In addition, all removable and interchangeable parts of the inspection tool should be identified and their relevant functions should be noted. The use of color-coded parts has proven to be an effective technique for applying the same gauge or inspection tool to multiple vehicle models. The requirements for interchangeable parts are:\x0d\1. The positioning pin bushing must be made of hardened steel: 2. Have a permanent handle.
\x0d\I: When using a height measuring tool to evaluate the measured parts, consideration should be given to making positioning cutting lines (such as grid lines) on the datum surface with a size greater than 1.2m. \x0d\J: In order to ensure the consistency of dimensional measurements from manufacturing to demonstration, the design should include the indicated datum starting point for coordinate measurement, including the main datum and auxiliary datum coordinates. These points can be tooling balls, pins, zero blocks, or some other clearly identifiable area on the base. \x0d\K: The design of the inspection tool should be such that each part of the inspection tool will not exceed the base seat of the inspection tool in any movable position. \x0d\L: Including data (mathdata), all part information required for manufacturing used in the design must be identified in the fixture design. \x0d\M: Any changes to the design of the inspection tool should be noted in alphabetical order in the change notification column attached to the upper right corner of the first page, and the appropriate places in the entire design should be circled. \x0d\N: The operating instructions and/or operating sequences for using the gage should be included in the final design draft, and the use of operating instructions in multiple languages ??should be considered where applicable.