Checking Fixture
Checking fixture is an important tool for controlling product quality. Automobile inspection tool is a device with precise detection technology. In standardized use, operators must operate gauges correctly according to requirements to improve product quality, avoid affecting the accuracy of gauges, and avoid incorrect part inspection data.
Concentricity Checking Fixture
Concentricity checking fixture is used to accurately locate and inspect components Generally, efficient control of product quality, size, and shape is achieved through concentricity checking fixture. There are many types of gauges, and the fixture testing used may vary depending on the different requirements and performance of each product. Select the corresponding concentricity checking fixture according to the specified requirements.
Correct Use of Concentricity Checking Fixture
The accuracy of concentricity checking fixture plays a crucial role in the quality of mass production of products. Even small errors have a significant impact on the quality of workpieces. When operating the concentricity checking fixture, the operator must follow the operation steps of the concentricity checking fixture specification. The systematic operation of positioning first and then detection is beneficial for improving the quality of the workpiece. It should be noted that unauthorized disassembly and arbitrary assembly of components are not allowed. If adjusting the components, they must be measured in three coordinates and meet the qualified results.
Most of the concentricity checking fixture is made of steel parts. If the moving parts are used for a long time, the reason for the “jamming” phenomenon of the moving parts is improper maintenance. If this phenomenon occurs, the operator cannot use hard objects such as hammers to repair the concentricity checking fixture and should seek professional maintenance personnel for repair. It is necessary to use reasonable methods to repair the concentricity checking fixture, to avoid deformation of the concentricity checking fixture parts. Technicians using concentricity checking fixture needs to undergo certain training, wear relevant protective equipment, and operate safely and in a standardized manner, which helps to reduce human damage to the concentricity checking fixture and ensure their good working condition.
Maintenance Method of Concentricity Checking Fixture
If the inspection equipment is not properly maintained after use, it may cause the machine to malfunction. In addition to inadequate maintenance, its accuracy may also be reduced due to environmental and operational procedures, and in severe cases, malfunctions may occur, causing inconvenience that cannot be used. If some parts fail, maintenance personnel need to replace the damaged parts promptly, to help the inspection equipment maintain or restore its performance and increase its usage time. As a type of process equipment, concentricity checking fixture may encounter some unavoidable faults and problems due to certain reasons after being used for some time. This situation may lead to the inability of product production to proceed normally, and even cause damage to concentricity checking fixture, resulting in a significant impact on product quality.
To ensure the safety and reliability of production and development, significant attention must be paid to the maintenance and upkeep of concentricity checking fixture. Manufacturers should design a maintenance system for concentricity checking fixture, which should include many aspects, such as detection components, concentricity checking fixture base plates, functional structural components of concentricity checking fixture, and concentricity checking fixture bodies. There are two main maintenance methods, namely preventive maintenance and corrective maintenance.
Preventive maintenance generally requires visual inspection or measurement inspection, and special tools can be used to maintain or restore the concentricity checking fixture to a good working condition. The operator maintains the concentricity checking fixture, which can be divided into two types: daily maintenance and regular maintenance. Daily maintenance is carried out after daily use, while regular maintenance is usually carried out during holidays or shutdown maintenance periods.
The main steps in preventive maintenance consist of the following:
- Ensure the external cleanliness of theconcentricity checking fixture, and many positions must be kept clean, such as pins, inspection pins, bottom plates, etc. And place some parts that need to be disassembled in their corresponding positions.
- Clean the stains on the guide rail and the inspection pin sleeve, and check that the fasteners in each part are not defective and must be intact. The inspection blocks and positioning blocks must not be loose or displaced. The marking scale and coating must not have any signs of wear or peeling.
- Clear identification ofconcentricitychecking fixture, such as measurement benchmark nameplates, must be visible.
- Remove rust and dirt from theconcentricitychecking fixture table, ensuring that the fixed positioning pin is in the designated position and cannot undergo any other deformation. Ensure that the clamping device is complete and complete, and the clamping position is consistent with the pressure point position, without any positional changes.
- Check that the number of positioning pins is complete, the markings are clear and visible, and there should be no bending or damage to the functional parts. All components of theconcentricitychecking fixture should be intact and without any looseness in the precision slide, and the structures that require lubrication should be lubricated with oil.
Design Principles of Concentricity Checking Fixture
The design of automotive concentricity checking fixture has played an important role in the manufacturing industry. There are many aspects of concentricity checking fixture design, mainly reflected in the appearance quality, and dimensional stability of the concentricity checking fixture; Convenient production and short-term manufacturing; Convenient operation for operators, such as product testing, worker operation, extremely high safety performance, reliability, and other aspects. Under objective conditions that allow and are economically applicable, to minimize the manufacturing time of operators, most technicians may use mechanized facilities, such as electromagnetic induction, electric, hydraulic, laser, pneumatic, etc. If the manufacturing time is too long, it will cause visual fatigue for the operator and further lead to a decrease in the quality of the workpiece. Whether it is the design of automotive concentricity checking fixtures or other mechanical designs, their design principles are the same. The principle is to first meet the basic requirements of its workpiece. That is to say, the overall design of an automotive concentricity checking fixture should be based on the principles of performance, practicality, aesthetics, and reliability. The specific three design principles are as follows.
1.Reliability Principle
Reliability refers to the ability of a gauge to complete the corresponding specified functions within its designed lifespan and specified range. Reliability can be divided into three aspects, including environmental adaptability, operational reliability, and inherent reliability. There are many measurement standards for reliability, and generally, there are three, including reliability, failure-free rate, and failure efficiency. Reliability is essential for the installation of every automotive concentricity checking fixture, to ensure that the concentricity checking fixture has not expired and must be within the specified range. To avoid harm to the operator caused by the machine, the operating position of the machine should not be set in areas that are inconvenient for workers to approach. All load-bearing components should have many characteristics, mainly including sufficient hardness, stiffness, and friction resistance. In the reliability design process of automotive concentricity checking fixture, the following principles should be followed:
- When designing the reliability of automotive concentricity checking fixture, technicians should consider multiple factors such as reliability, production time, and workpiece performance to design the best design solution.
- Regarding the fault mode. If there is a malfunction in the components, system structure, or electrical components, the fastest way to solve the problem or control the possible failure modes that may occur during the product’s use time should be designed.
- The complexity of theconcentricitychecking fixture should be in line with the production plan, and multiple fast and efficient structures should be used as much as possible to achieve the goal of easy operation. And, minimizing auxiliary time as much as possible, the greatest benefit is to improve productivity.
- When designing gauges, efficient design principles and reliability schemes are generally adopted. It is necessary to conduct experiments before adopting new technologies, processes, and materials. This design has a huge impact on reliability. For example, the application of some new materials on automotive opening gauges has undergone experimental verification before finally being recognized by manufacturers.
- Reliability design must be applied to every step of functional design. At the same time, not only meets the basic performance requirements but also comprehensively considers various factors that affect reliability. This mainly includes the hardness and stiffness of the parts, as well as the stability of the structure.
2.Principle of Craftsmanship
Automobile concentricity checking fixture needs to ensure both their performance and the requirements of the assembly process. Not only does it require a simple structure, easy operation, and quick and convenient actions for operators during operation, but it also needs to be convenient for production. Automotive concentricity checking fixture must meet the assembly and testing requirements of the product, and the principles of craftsmanship mainly include the following aspects:
Automotive concentricity checking fixture may consist of a single component or multiple components. Some car concentricity checking fixtures have complex structures and many operation steps, most of which are manually inspected. It is important to reserve some operating space during design.
The structural design of the automotive concentricity checking fixture should be convenient for production, assembly, structural adjustment, inspection, and maintenance of components. For example, the manufacturing of automotive concentricity checking fixture is not multi-piece production but single-piece production. If the final accuracy is guaranteed by adjustment, a structure that is convenient for operation, adjustment, and repair should be set up on the automotive concentricity checking fixture, such as adjusting cushion blocks.
Automobile concentricity checking fixture is equipment with extremely high precision and has certain requirements for the production environment. The production workshop inevitably produces smoke, metal, or waste, which can damage the smooth working surface exposed on the automobile concentricity checking fixture. The concentricity checking fixture has the characteristic of strong adaptability, to adapt to different detection objects and working environments. Design shielding and protection measures at important positioning surfaces, including transmission mechanisms, electrical circuits, and other locations.
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