ultrasonic measuring tool
A critical element in the manufacture of many products is the setting of parts or subassemblies using threaded fasteners. In general, the systems approach is necessary carefully plan each step so that the reliability that exists on paper can be applied in the Assembly. The objective of the manufacturer is to maximize the overall long-term integrity, minimizing the product cost.
The standard technique for controlling the clamp force is a pair of thread. However, it is known that the wrong partner indicator of the burden of the clamp. Recently, the automotive industry began using other methods such as the pair / turn adjustment and performance in an attempt to improve the reliability of critical applications fixing their products. Since the ideal method is a form of direct load control, various organizations have worked on progress in this field.
The key value is obtaining sufficient clamping force so that each spouse retains the Environment Service the field. To this end, the clamping force at the meeting must be large enough to offset the effects of relaxation and burden to others that modify the original clip strength. The importance of bolt preload (or clamping force in the city) can not be overestimated. It is the main factor affecting the reliability screwed. It is often the major cause of seal failure, resulting in separation of the joints, leaks, looseness or fatigue.
Without good clamping force, the distortions using drills, cylinder heads, and joints with joints can occur. Solving these problems is less costly if taken before the product assembled in the factory. Therefore, the automotive industry is working hard to ensure that the joints are defective are detected and corrected in each assembly station.
An ultrasonic technology initially developed by the ultra-fast has made the direct control of the load bolt practical and cost-effective production process. This technology produces a thin film piezoelectric fixing the creation of an ultrasound sensor strength. The film is permanently applied by spraying empty. This proven process used to deposit layers for many commercial applications. Pins for high-volume applications can be coated with a cost of pennies per screw. Thus, each fastener acts as a transducer to the Assembly.
There are a number of patents involving tools, methods and devices using the torque and angle of rotation of the restriction of the bra. Inventors are still finding ways to use the angle of rotation to solve fixing problems or improving process control. A wide range of companies active in this field. The car companies, hardware companies and many others have contributed.
There was much activity in the field of ultrasonic measurement and control technology. Most of this activity focused on the use of piezoelectric film that applies to the setting in order to control the adjustment of the fasteners.
The main purpose of the tool near future, direct load control be used and will result in the following:
-100% Quality clamping load on the assembly of
The costs of reducing labor due the tool less reliance on testing and calibration
Using less expensive tools
Joint optimal conceptions and reliability of process
The reduction needs to test the pair of clamping voltage
Improved methods of assembly-mixed with the joints
In general, there several forces shaping the future of the markets of the clamp load control:
Improved accuracy of the load of screws is achieved in the production process of the assembly. The accuracy of torque below the level of ± 5% will be lower in areas of concentration. Operator safety tool for injury prevention and will remain an important influence on the tools
Productivity and pressures to reduce costs continue to rise due to global competition.
He believes that the change of torque control orientation will be more productive. This area has reached the point where improvements in controlling the clamp load not possible because the main controlling factor is friction. The law of diminishing returns has set in the control area of torque. Both the monitoring of performance and torque compared to motor angle applications have reached a plateau. Load control loop by direct measurements of ultrasound to become the next trend.
In view of the direction that the evidence of ultrasound technology, as developed by ultra-fast, carry out major changes in the assembly in the longer term initiative to implement the first applications. The physical requirements are not difficult to perform, but because they are affected many areas, the transition will require coordination of many groups. Change is not easy, but the benefits of this technology outweigh the difficulties.
Our forecasts indicate that the action of the Assembly will be revolutionized as control of ultrasonic technology begins to supplant the control methods torsion in the large automotive companies in the world. This will change the tool axis competitive business, and the electric-powered tools have changed the business in previous years.
About the Author:
This is a summary of an annual strategic report on aluminum anodizing technology written by Guideline staff and experts. For more information please visit us at
www.intota.com
, or contact Brian Reuter, Director of Product Realization,
breuter@guideline.com
.
Article Source: ArticlesBase.com – Current State of Joint Integrity Technology for Threaded Fasteners
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