Fixture Testing
Fixture testing can effectively ensure the quality of stamped products, improve production efficiency, and ensure production safety. By inspecting fixture testing, it can be ensured that the product meets quality requirements and guarantees performance in terms of usage and appearance.
Fixture testing is an indispensable tool for pursuing quality assurance, and its function is to accurately locate and inspect components. Checking fixture enables manufacturers to verify whether the errors in the produced workpieces are within the specified manufacturing error range. There are both manual gauges and automated system gauges. Due to the increasingly developed manufacturing industry, the use of automated fixture testing is becoming more and more widespread. The range of gauge types meets different inspection requirements and manufacturing processes.
Usually, effective control of product quality, size, and shape can be achieved by inspecting fixtures. Select appropriate gauges according to specified special requirements to achieve the best efficiency. Checking fixture plays an important role in the automotive industry, providing significant assistance in ensuring product quality and compliance with design specifications. The fixture testing is used to accurately locate, fix, and inspect components, verifying their size, geometric shape, and surface finish according to predetermined standards.
Design of Fixture Testing
Overall Design
Due to the large number of automotive components in the automotive industry, the performance of each component is different, and specific quality requirements are met based on unique needs. Specialized design based on the structural characteristics of the product, effective design helps improve product quality and production efficiency. In most cases, designers conduct online inspections of products through the reasonable design of automotive fixture testing, which has the advantages of meeting the requirements of drawing design, short-term inspection, convenient operation, and strong usability. Mexican manufacturers have effectively improved their production efficiency by utilizing automotive inspection fixtures.
The essence of automotive fixture testing is to simulate the assembly relationship of the vehicle body and use fixture testing to inspect the body parts. Before designing an automotive checking fixture, it is important to determine the design requirements, meet all inspection requirements, and collect design data. Proficiently mastering the position and function of parts in the vehicle body, especially the internal and external parts fixture testing, with complex matching relationships, requires designers to have an overall idea, analyze the positioning and testing requirements of the product through matching parts, and try to use the actual loading position as much as possible. During inspection, the position in the vehicle coordinate system should not have any deviation and meet the testing requirements accurately and reliably.
Economic Feasibility of Gauge Structure
1.The assembly positioning in the fixture testing structure plays a very important role. The fixture testing should have a complete assembly positioning benchmark, which facilitates the manufacturing, assembly, debugging, and maintenance of the fixture testing in the later stage.
- The structure of the tool should be simple, the overall structure of the fixture testing should be simplified as much as possible, and the structure of the car checking fixture should not be too complex. Surfaces that require mutual positional accuracy should be clamped and processed as much as possible in one go.
- It should have good processing technology, easy manufacturing, and meet assembly and testing requirements for the processing and transition of negative angles. The structural elements of the fixture testing should be as uniform as possible, and can also be processed under ordinary equipment and tools.
Bottom Plate Design of Fixture Testing
The base plate is the largest basic component that connects the independent structural units on the gauge into a whole. It is a platform for accurately installing functional devices, mobile devices, auxiliary devices, and other functional units. The base plate of the gauge is the standard for inspecting, measuring, and building systems. The bottom plate of the car fixture testing needs to have stability and firmness to improve its service life and bear all the weight. With the emergence of new technologies and materials, the bottom plate should be designed and manufactured as lightweight as possible, and have sufficient strength and rigidity. To facilitate manual or machine transportation, its total weight should be less than two tons.
The bottom plate plays an important role in the structure of the fixture testing, with its main functions including serving as a load-bearing structure, as an overlapping base for other functional components, as an auxiliary measurement reference, and as the main structure of the mobile device. The deformation and collapse of the bottom plate can affect the flatness and perpendicularity of the bottom plate surface, which can have an impact on the measurement results and seriously lead to the failure of the accuracy of the measuring tool. To improve the stability of the checking fixture, the width of the bottom plate cannot be less than half of the height of the fixture testing. The length and width of the measuring tool should meet the requirements that the lifting device, clamp, section template, and other parts must be within the range of the base plate when placed, stored, and in working condition. The base should fully consider the use of flexibility. For different car models with similar sizes and structures, Mexican manufacturers should consider reuse and fully flexible design for the base.
Design of Fixture Clamping Device
When Mexican manufacturers use automotive fixture testing, they need to use positioning components to determine the position of the product and avoid shaking. The installation of the product on the fixture testing includes two closely related unified processes: positioning and clamping. The purpose of designing the clamping device for the fixture testing is to maintain the specified position of the product on the positioning piece unchanged during the inspection process, to ensure reliable contact between the positioning reference of the product and the positioning surface on the fixture testing, avoid changes in the position and shape of the product during the inspection process, and prevent damage to the balance system of the checking fixture under external forces.
Functional Device of the Fixture Testing
The functional devices of the fixture testing are divided into three types, including positioning device, clamping device, and detection device.
（1） Positioning Device
The positioning device of the fixture testing is used to ensure the positioning accuracy and connection strength of each component in the car fixture testing, as well as the reliability of the entire car fixture testing, ensuring that the correct installation and position of the product are accurate and error-free. The positioning device in automobile fixture testing includes positioning holes, positioning supports, positioning points, positioning axes, positioning pins, and imitation positioning (matching parts).
（2） Detection Device
The automobile inspection device is an important component of fixture testing, and many factors affect the reliability of the results, such as the accuracy of the inspection device and the selection of measurement point positions. The detection device of the gauge is a device used to indicate the actual value or error size of the measured parameter. The detection device can be divided into two categories based on its performance, qualitative and quantitative. The function of qualitative automotive fixture testing is to only determine whether the dimensions of the parts are qualified; Another type is quantitative gauges, which have numerical reflection and higher measurement accuracy than qualitative gauges. This type of gauge can provide a basis for evaluating the process capability of products.
（3） Clamping Device
The clamping device is mainly used to clamp the product onto the car fixture testing. The function of the clamping device is to ensure that the product is positioned and clamped in the correct position and that the position of the product does not change under the application of other external forces.
Principles of Fixture Testing
Technical Requirements
Automobile fixture testing should ensure both performance and assembly process requirements while striving for a simple, lightweight, durable structure, convenient and fast operation, and easy manufacturing. The principle of processability refers to the ability of the designed gauges to meet the following assembly and testing requirements of the product:
① The structural design of automotive fixture testing should facilitate manufacturing, assembly, adjustment, testing, and maintenance. For example, the manufacturing of specialized automotive checking fixtures belongs to single-piece production. When ensuring final accuracy through adjustment or maintenance, Mexican manufacturers should set up structures that are easy to adjust and maintain in automotive fixture testing, such as adjustment pads, inserts, etc.
② This tool is a high-precision equipment that has certain requirements for the production environment. The production workshop inevitably produces smoke, metal, or waste, and a poor environment can affect the working surface of the fixture testing. To avoid external influence on the fixture testing, the operator needs to take measures to cover and protect important positioning surfaces, such as slides, transmission mechanisms, electrical circuits, etc.
③ Automobile fixture testing is generally composed of single or multiple components, and the structure of fixture testing can be simple or complex. The operation sequence of complex inspection fixture is diverse.
Reliability Requirements
Reliability refers to the specified performance requirements of automotive checking fixture within the design time and given conditions. There are many types of reliability, including inherent reliability, operational reliability, and environmental adaptability. There are generally three indicators for measuring reliability, such as reliability, fault-free rate, and failure rate.
Automobile fixture testing must have installation reliability to ensure that all load-bearing components have sufficient strength, rigidity, and friction resistance during their service life. The operating position should be set in a location that is easily accessible to workers to ensure production safety. The following principles should be followed in the reliability design process of automotive fixture testing.
Reliability design must run through all aspects of functional design while meeting basic functions, and comprehensively considering various factors that affect reliability. Such as the strength and stiffness of the parts, the stability of the structure, etc. The operation of the fixture testing is simple, reducing manufacturing time and improving production efficiency. The failure modes that may occur during the product’s lifecycle should be designed to eliminate or control them as soon as possible, based on the occurrence of system, component, or electrical component failures or failures.
Usually, effective control of product quality, size, and shape can be achieved by fixture testing. Select appropriate gauges according to specified special requirements to achieve the best efficiency. Fixture testing plays an important role in the automotive industry, providing significant assistance in ensuring product quality and compliance with design specifications. The fixture testing is used to accurately locate, fix, and inspect components, verifying their size, geometric shape, and surface finish according to predetermined standards.
Related News
Applied’s expertise in modifying materials at atomic levels and on an ihdustrial scaleenables our customers to transform possibilities into reality.
