Checking Fixture
The function of checking fixtures is to accurately locate and inspect components. This device has multiple types, and the types of gauges used may vary depending on the different requirements and performance of each product. Select the corresponding inspection tools according to the specified requirements.
An inspection fixture is used to detect components, and its main function is to help confirm and inspect the precision of specifications, appearance, and other products. Checking fixture is used for embedding, specification, angle, and product surface, all of which are used to measure whether the size meets the design value and whether the geometric error is within the range of the design value. Some gauges can be used with only one to complete many tests, such as gauges for specifications, angles, fit, and shape.
In general, fixture testing is used to solve complex shaped manual tools, micrometers, etc. that operators cannot measure. By using fixture texting, operators can reduce the deviation of measurement values, and the data measured may vary depending on the measurement personnel. This tool can shorten labor and manufacturing time, helping to efficiently detect whether components meet manufacturing standards.
Design of Automotive Inspection Fixture
In daily manufacturing, the manufacturing industry is gradually developing, and inspection fixture such as gauges are commonly used in the automotive manufacturing industry. The design of automotive inspection fixture has played a significant role in the automotive production process. The function of an automotive Inspection fixture is to check whether some parts of the car meet the specified requirements in terms of specifications, shapes, and placement. This inspection step will be beneficial for improving the quality and production efficiency of automotive products.
1.Basic Points
The design of automotive inspection fixture must meet the requirements of standardization, which helps to increase the interchangeability of Inspection fixture. The main function of designing an Inspection fixture is to check whether the geometric dimensions, shape, position, etc. of automotive components are correct, ensuring that the components have the advantages of high precision and high quality. The Inspection fixture for designing cars will be widely used and applied to many components, such as car bodies, chassis, engines, etc.
There are many advantages to automotive inspection fixture, mainly the following points: the demand for cars is gradually increasing, which will lead to an increasing demand for automotive Inspection fixture. Due to the widespread use of automotive Inspection fixture in the market, manufacturers need to continuously improve their technical level, produce efficient and high-quality products, and achieve better conditions. In the current manufacturing industry, the automotive industry is one of the rapidly developing industries, and the development trend of automotive Inspection fixture is getting better and better in the industry. Manufacturers improve their technical level and enhance the precision of their products.
2.Design Points
The main points of automotive Inspection fixture design include the following aspects:
Precision: Technicians will utilize manufacturing machines and measuring instruments with high precision advantages in design, to improve the manufacturing accuracy and measurement precision of gauges. The accuracy of automotive Inspection fixture has an impact on the detection accuracy of components. If the accuracy of some products is not high enough, it will reduce the quality of automotive products.
Quality: The quality of Inspection fixture is closely related to the quality and production efficiency of automotive products. During the design process, operators must pay attention to the selected materials, structures, technologies, and other aspects, which can help improve the reliability of automotive Inspection fixture.
Shape: One of the important quality factors is the appearance of automotive Inspection fixture. Designers need to pay attention to the degree of beautification of the appearance during design, to achieve specified requirements and usage needs. If the manufactured product does not meet the specified requirements, it will affect the competitiveness of the product in the market.
3.Future Development Trends
Multi-sector Cooperation: Automobile inspection fixture design will cooperate with other fields, mainly including the Internet. If this is implemented, it will improve the transformation and rapid development of the industry. Through this method, new fields and development opportunities will be discovered, which will help improve the competitiveness and influence of the product.
Unique Design: In the field of automotive production, automotive products are constantly increasing their personalized needs, and technicians are considering increasing their personalized requirements.
High Technology is being Used: Due to the gradual development of technology, personalized requirements are the most widely used in the design of automotive Inspection fixture. The design of automotive Inspection fixture brings new requirements, mainly through digital technology, intelligent manufacturing technology, etc. If these technologies are used, the Inspection fixture will have higher accuracy and production efficiency.
Protecting the environment: automotive inspection fixture is gradually being strengthened for their environmental protection and sustainability. The use of environmentally friendly materials can bring certain benefits to the environment. If the energy consumption and emissions of the product are heavily used, it will have an impact on the quality and environment of the product. The development trend of the industry is to increase the usage time of products.
Repeatability of Inspection Fixture
During the process of using the Inspection fixture, operators found that some of them not only met the design requirements but also met the high-precision manufacturing requirements of the three-coordinate system. When inspecting parts, significant fluctuations often occur. If this situation occurs, the entire measurement system will be analyzed to detect data fluctuations that occur during use, whether it is a problem with the equipment or the inspection staff.
In the automotive industry, the use of gauges has been constantly improving detection performance. Manufacturers not only attach importance to the material, manufacturing accuracy, durability, deformation resistance, and product quality selection of gauges but also pay more attention to the accuracy of the system. The biggest occurrence is that more and more manufacturers have noticed and attached great importance to the repeatability of the Inspection fixture itself, and are using systems to prevent changes in testing data.
To avoid such measurement changes during the design and manufacturing process of Inspection fixture, many manufacturers have begun to incorporate repeatability requirements into the pre-acceptance requirements of Inspection fixture manufacturing suppliers. If such statistical analysis is conducted, the workload will increase and the completion time will be extended. To ensure that statistical judgments meet the requirements of validity, reducing workload will shorten the time. There are several general methods for repeatability analysis:
1.Analysis of Variance Method
This method is a standardized statistical technique that can be used to analyze measurement errors and measure the reasons for data changes in system analysis. Using the analysis of variance method, the sources of variation can be divided into four types: parts, evaluators, interactions between parts and evaluators, and repeated errors caused by measuring tools.
2.Range Method
This is an improved research method for metrological measuring tools, which has the advantage of providing an approximate value of measurement variability in a short period. The overall situation of the entire measurement system will be provided through this method, without decomposing variability into repeatability.
3.Mean Method
This is a mathematical method that provides repeatability calculations for measurement systems. Divide the measurement system into repeatability and provide some measurement system or information that detects errors at the same time.
Each method has unique advantages, and due to the complexity of variance analysis, mean and range methods are commonly used. However, compared to the mean and range methods, the analysis of variance method has many functions and will be applied in any experimental debugging. It can estimate variance more accurately, separate more information from experimental data, and reflect the degree of dispersion of a dataset.
Dimensional Measurement of Inspection Fixture
When operators use gauges for size inspection, they will use several positioning components, mainly through reference pins and guide rails, to measure whether the size error of the components and gauges meets the specified requirements. For large components, not only positioning pins and guide rails are needed but clamps are also used to determine multiple positions for measuring dimensions. Different components correspond to different gauges with different functions, and the equipment is used to measure various components. Automotive components are commonly inspected using an Inspection fixture.
The longitudinal beam of a car is a component that forms the chassis framework, which is placed under the body of the vehicle. The vehicle with a single shell body is welded to the floor. The composition of the longitudinal beam consists of three major parts, mainly including the rear longitudinal beam, longitudinal beam, and floor longitudinal beam. The left and right longitudinal beams are joined by crossbeams, playing a crucial role in the strength and torsional stiffness of the vehicle body. Use welding to synthesize each crossbeam. During the inspection process, the equipment needs to check the overlap of each beam and the shape of each component.
The door frame refers to the window frame of a car, which has many functions, mainly reflected in protecting the body of the car, fixing the glass, waterproofing, and so on. The door frame and door body formed together are called integral doors, which are large panels with a three-dimensional shape. In the process of manufacturing the door frame of the integrated car door, operators use many processing methods, such as splicing welding plate method, laser brazing, and so on. After manufacturing, an inspection fixture will be used to check the machining accuracy of the product.
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