è…§ ,, Gu Maozhong OCK spiral new thread bookmark1 self-locking fasteners bookmark2 car body manufacturing industry often encounters loose problems with threaded fasteners and feels a headache. In recent years, they have been very excited about a new type of spiral thread with a self-locking function (SPIRALOCK).
SPIRALOCK we call it the Schmidt thread. It has been widely used in the assembly of engines in the automotive industry, the brackets of doors and compartments, the assembly of various parts of the body and the brackets of engine components.
The spirometry is done by SPIRALOCK taps. This approach is economically attractive because its mother-in-law has a unique shape that can be used to tighten all common standard threaded bolts without changing the bolt design or using other inserts.
SPIRALOCK Taps and Thread Plugs are available in 36 different shapes of taps, which are available in plain straight, spiral head, swivel, alloy and T10 materials. The internal thread of the Spire nut is designed to be used with 2A bolts.
A series of laboratory tests and numerous practical applications have been pointed out. Due to the design innovation of the SPIRALOCK tap, it is made of the nut of the thread of the thread, so that the problem of the looseness of the threaded fastener is often solved in the automobile assembly industry. When the threaded hole made of the Spruce thread tap is matched with the standard standard bolt, no other locking device or adhesive is needed.
The best way to analyze the exact use of the Spironx thread is to compare it with a common threaded fastener. The conventional conventional 60V female thread is completely dependent on the frictional force between its symmetrical threads, that is, the frictional force generated by the lower threaded surface of the bolt contacting the upper threaded surface of the nut.
The innovation of the Squid thread tap is that it has a 30 wedge-shaped bevel at the base of the female thread. When tightening, the crest on any standard bolt is tight against the wedge-shaped bevel of the thread, allowing it to be applied to the thread. The normal force generated by the contact is about 60 degrees to the axis of the bolt, rather than 30 degrees as with a standard standard thread. Obviously, the normal pressure generated by the former is much greater than that of the buckler, and the anti-slipping friction force generated by the former is inevitably greatly increased.
In any threaded fastening system, there must be a gap between the bolt and the nut. In most cases, sufficient clearance is necessary between them to facilitate the assembly of the male and female threads. In addition, the standard thread design and its tolerances also encounter many unavoidable problems, such as the wear of taps, drills and dies, the accuracy of machine tools and so on. The key to meeting these requirements is the gap between the threads of each pair of male and female threads and the bottom of the root.
When subjected to vibration or lateral loads, the radial clearance between the male and female threads produces a relative radial displacement or lateral movement. When the force of moving to the side is affected by the conventional thread, the locking friction force on the thread surface is reduced, and the tension or load force of the male thread fastener causes the force of the loose nut to rotate.
After research, the Massachusetts Institute of Technology (MIT) pointed out that the SPIRALOCK thread is three times more resistant to lateral movement than the standard standard thread (see).
In the laboratory test, the transverse load vibration test was carried out with the unkers test rig. SPIRALOCK showed that it has excellent anti-vibration ability with new non-APfwIuci new products (see). They tested three basic mothers. Thread: One is a common standard nut, one is a torque lock nut and a sturdy nut made of SPIRALOCK tap. Using the same common standard bolts, the same tightening load torque, the same amplitude and frequency and the same test time controlled by the laboratory, the result is: the ordinary standard nut is almost loosened immediately, losing all the locking ability, The torque lock nut loses 70% of the locking capacity; the Shibuki nut retains its self-locking ability during the two minute test.
The test also proved that the Schmidt thread, unlike other threads, can be tightened on the bolt and then tightened many times without a significant loss of its locking capacity. In the assembly of each pair of nuts and bolts, such as loosening and tightening several times, the ordinary standard nut and torque lock nut will quickly lose their locking ability after each continuous test, and the Shibong nut can continue to be maintained. Its original locking ability.
The wedge-shaped surface of the Spruce thread also eliminates common thread slippage or shear problems. A conventional conventional 60V thread receives most of the locking load on its first mating thread surface. In some tests, the first two threads took up to 80% of the load. When a load is applied, the male thread begins to elongate near its bolt head and at the first mating thread face. As the locking load continues to increase, the second threaded surface begins to withstand some load. In many cases, when a certain locking force needs to be transmitted to the third and fourth thread faces, it begins to wear off the first thread and causes slippage.
The wedge-shaped bevel of the sturdy thread is designed to have a continuous, spiral, high-friction contact surface, so that the thread made of the sturdy thread tap can avoid the problem of concentration of the locking load.
A study conducted by the University of Michigan in 1984 showed that 60% to 70% of the locking load of a common standard nut and bolt combination is concentrated on the first and second thread faces, while the Schlumberg nut shows The 17% of the total locking load can be evenly distributed on the first thread surface, and 12.5% ​​of the total locking load is distributed on the last thread surface.
In terms of price, the automaker found that the Sprague thread system is 25% cheaper than the epoxy-reinforced fasteners used to drive the sprocket seat to its cabinet. These are the processing and assembly costs of including fasteners. In addition, the Spitz thread system also makes assembly automation possible and proves to be very helpful for vehicle assembly lines. With the Squid threaded fasteners, the housing and sprocket seat can be easily disassembled and reassembled without losing their locking force.
Oshkosh Heavy Duty Trucks manufactures four-wheel drive gearboxes for heavy-duty vehicles, using Sprux thread taps to make threaded holes in the box. The company also uses cap screws in accordance with SAE standards. The previous fastening method consisted of three parts, namely a 5-stage fitted double-ended bolt, a locking washer and a nut. After using the Squid thread, it not only simplifies the assembly process, but also eliminates the box. Looseness of the double-ended bolt on the surface of the body.
Another user of the Spencer thread system is Litton Vibration Source Systems, Inc., Alvin, Texas, which manufactures seismic vibration equipment for petroleum exploration engineering. The most troublesome part of such a device is the driven structural member that connects the huge piston to its foundation. When the equipment system is in operation, it can generate huge hydraulic power, up to 92 USgal/min (348L/min) and 3001bf/in2 (210N/cm2), and the force of the hydraulic cylinder on the board can reach 50 000. 2271). Thanks to the combination of the anaerobic adhesive and the locking washer, the reliability was less than 100%. Litton finally built several sets of seismic vibration equipment using Splendid threads. After field use, Litton engineers proudly discovered and confirmed that none of the equipment was used under harsh working conditions and failed due to loose fasteners or shear failure. They switched all of their products to the Spironx thread system. After two years of field use testing, they did not find that the fasteners were loose and failed, and they did not even need to retighten the threaded fasteners.
It can be seen that in today's automotive industry body manufacturing industry, the focus is on reducing production costs, and the thread made by Schmidt thread taps is ideal, which improves the locking force of the bolt nut and the screw fastening due to vibration. The risk of loose parts is reduced. This is the two major advantages of this sturdy thread tap. In order to improve your product and simplify the production assembly line system, all manufacturers can simply replace and use the screw holes or nuts made of the Spiral thread tap to make the threaded fastening assembly never loose.
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