Comprehensive checking fixture is an advanced, comprehensive inspection tool. Can be accurate, fast, multi-functional measurement of parts several, or even a dozen parts under test, with accurate measurement, time and labor-saving features.
- Definition.
Comprehensive checking fixture, also known as functional master model checking fixture or body master checking fixture, also known as CUBING or CUBIC, is an accurate replica of the car composed of the body, interior and exterior trim. It is an exact copy of the approved drawings and is a special type of checking fixture to verify the assembly process exactly according to the design data, which is made of aluminum and epoxy resin in a 1:1 scale according to the 3D data. The functional master model checking fixture is a high-end product in the application of checking fixture for new models, which should match both the whole vehicle and the parts. In the checking fixture industry is a veritable “three high” products, that is, high design requirements, high manufacturing technology requirements and high use skills requirements. Comprehensive checking fixture makes it possible to accurately match the manufactured auto parts with the real model to ensure that the manufactured parts fully meet the technical drawing requirements.
- Structure.
The main structure of the integrated checking fixture includes the base, carrier model, standard parts module, connection parts parts. The base is used to carry the carrier model, determine the position of the coordinate system of the whole vehicle, to help realize the functions of handling, lifting, towing, etc.. The main function of the carrier model is to serve as a carrier for interior and exterior trim parts and some functional parts, and to simulate the installation of actual parts. The standard parts module is a high precision model made according to 1:1 processing according to the 3D data of the product, which is used to install on the carrier model to verify the matching of the interior and exterior trim parts, and the corresponding parts of the standard parts module can be matched on the checking fixture. Coupling parts are used to connect the standard module and the carrier model, mainly including hinges, fasteners, etc.
- Function
The function of the integrated checking fixture is to evaluate the size and mutual matching effect of the interior and exterior parts of the car by simulating the assembly process and state of the real car parts, measured by special tools. This process can be achieved through different combinations: real car parts matched to the integrated checking fixture, standard parts module installed to the real car (part of the standard parts module can be achieved), parts and parts, parts and standard parts module and other modes. By analyzing the matching results of parts on the integrated checker, the original design defects and deficiencies can be corrected, which may be part problems, or design or process problems, as the basis for design data changes. The function of the integrated checker is reflected in all stages of product development and quality control.
① Product design stage: for the development of brand new models, reference data is relatively small, and can only rely on benchmark models, at this time the comprehensive tool can help to quickly debug work, especially in the early parts and equipment state are unstable, can become a reference benchmark, can be used to assess the rationality of the parts design structure and matching relationship, timely detection of design problems; also through the assembly of parts, the Evaluate the reasonableness of the process and develop a reasonable process in advance.
② Product verification stage: comprehensive checking fixture can play a key role in this stage, especially in the first test assembly stage of the actual vehicle parts, many design and process confirmation work can be carried out on the comprehensive checking fixture.
③ Trial production stage: In this stage, the conflict between body-in-white and interior and exterior parts is inevitable, and the integrated checking fixture can link the digital prototype and mass production model as well as each real car part together. The root cause of the problem: for example, body problems, component problems or assembly problems. Guide the modification of non-conforming parts and problem solving to improve the overall quality of the product. Sometimes can also find out the problems in the design and manufacture of single parts checking fixture, improve the quality of single parts checking fixture.
④ Formal production stage: this stage of the comprehensive checking fixture is mainly used for daily control of parts quality and problem analysis, encounter quality fluctuations, can not determine whether it is a problem of parts or body-in-white, the comprehensive checking fixture can be used to quickly find the root cause of the problem; can also be used to monitor the quality of key components; through the regular sampling of supplier parts, monitoring the stability of the quality of parts to prevent quality problems occur.
- Manufacturing requirements
The manufacturing accuracy of the integrated checking fixture is high, and the related dimensional and form tolerance requirements are strict, and its main manufacturing is best done in one go by machining center. But the machining center may not have every factory, so the checking fixture itself should also allow a certain manufacturing error, do not meticulously require ” zero to zero “, according to my experience, with a certain technical quality of workers, careful processing on ordinary machine tools, can also be manufactured to achieve the expected accuracy of the integrated checking fixture.