Tube expanding tool

FIELD: plastic working of metals, possibly tube expanding.

SUBSTANCE: tool includes clamp mechanism having clamp cylinder and spacing rod arranged in it. Tool includes housing in which compression spring is arranged in such a way that its one end rests upon housing and other end rests upon end of clamp cylinder; force working member mounted inside compression spring and made of shape memory alloy. One end of working member is secured to housing; its other end is secured to spacing rod. Spring and working member are made with possibility of creation in common system of forces in which direction of summed vector acting upon spacing rod depends upon temperature of working member. Increase of working member temperature till value exceeding that of reverse martensite conversion causes generation of efforts transmitted to spacing rod due to shortened length of working member.

EFFECT: lowered cost price of labor, enhanced efficiency of tool.

1 dwg

 

The invention relates to techniques for processing of metals by pressure and can be used for expanding tubes in particularly difficult conditions.

The traditional method of rolling tubes in some cases, it is very time consuming. An example is the process of replacing the pipes in the repair of marine steam generators when you need securely and tightly secure the ends of many thousands of pipe ends in the holes collectors, while working in a very cramped working space and often under extremely adverse conditions pitching of the ship.

Common ways of rolling tubes is the use of devices based on the collet tools, equipped with Electromechanical actuators.

Closest to the claimed device according to the essential features of the same purpose is the device for securing the tubes, which contains the collet mechanism consisting of a collet cylinder located therein the spacer rod (A.S. USSR №845995, 21 D 39/06, 15.07.1981).

The disadvantage of this device is that in the implementation of business cycles requires an external impact, creating a calculated force on the spacer rod to move. In this work units (for example, pneumohydraulic, electromechanicheskij drives and the like), formiruyusch is such an effect, because of their considerable size and produce noise adversely affects productivity and hinders their use in cases, when work is done in a small space under adverse conditions.

The task to be solved by the invention is the change in structure, which can speed up the expansion pipe in particularly difficult conditions. The technical result of the invention is to increase the specific health of the device and reducing the cost of labor.

The technical result is achieved by the fact that, as a prototype, the proposed tool for expanding tubes includes a collet mechanism, consisting of a collet cylinder located therein the spacer rod.

The peculiarity lies in the fact that the tool is provided with the housing and placed in it a compression spring, one end of which has an emphasis on the body, and the other end of the collet cylinder. Inside spring placed a work force element, made of an alloy with shape memory effect, one end of which is fixed to the body, and the other is attached to the spacer rod. When this spring and work force element is designed with the ability to co-education system of forces, the direction of the resultant vector whose actions on the spacer rod depends on the working temperature of the power element, the increase of which to the temperature exceeding the temperature of the reverse martensite transformation, causes the generation of the efforts transferred to the spacer rod by reducing the length of the working force element.

Implementation of the task based on the property of a metal with shape memory effect to increase or decrease its own linear dimensions with a corresponding change in its temperature, while developing significant efforts.

Shown in the drawing tool for expanding tubes consists of a casing 1, a collet cylinder 2, the spacer rod 3, the working of the power element 4, kontrbrusya 5.

The tool works as follows. At low temperature (e.g., 0÷20° (C) conclusin 5, overcoming the resistance of weakened (which is in the martensitic state) of item 4, put forward from the housing collet node, consisting of a collet cylinder 2 and the spacer rod 3. Advanced site operator (worker) enters inside intended for the rolling of tubes 6, the end of which is located in the hole of the tube plate 7. Then using a hose (not shown) through the holes 8 in the housing 1 is hot refrigerant, which increases the working temperature of the power element 5 to a temperature of 50-70°With (higher the temperature of the reverse martensitic transformation). When heated, the work is silt element 5 is committed in consequence of the shape memory effect to reduce its length, developing efforts, reaching values above 60 kg/mm2. These efforts, overcoming the resistance of kontrbrusya 5, is transmitted to the spacer rod 3, which Digas expanding part in collet cylinder 2, and extends in the radial direction its moving sectors. Radvilas, the movable sectors, in turn, impinges on the wall of the pipe 6, increasing its diameter until the moment it touches the outer side of the tube with the surface of the tube plate 7. Simultaneously, moves the collet cylinder 2 together with the spacer rod 3 as a whole along the pipe axis 6 toward the housing 1. As a result, the end of the pipe 6 in the zone of the tube plate 7 increases in diameter until it is firmly in contact with the tube Board 7. The process of expanding. When the output of the collet cylinder 2 and the spacer rod 3 from the zone of the tube plate 7 tool freely separated from the pipe 6, after which the cycle can be repeated.

The number of cycles is determined by the durability of the working force element. Work force elements are made of Nickel-titanium, capable of millions of cycles. On the other hand, the time of each cycle depends on the speed of heating and cooling power of the item and may vary, depending on its mass, minutes or even seconds.

In affect, the, the proposed tool for expanding tubes can be used to fast-expanding tubes, which is especially important in case of unfavourable conditions of work, including the sea.

Tool for expanding tubes containing collet mechanism, consisting of a collet cylinder located therein the spacer rod, characterized in that it is provided with a body placed in it by the compression spring, one end of which has an emphasis on the body, and the other end of the collet cylinder, and is fixed inside a working power element, made of an alloy with shape memory effect, one end of which is fixed to the body, and the other is attached to the spacer rod, with a spring and a work force element is designed with the ability to co-education system of forces, the direction of the resultant vector whose actions on spacer rod depends on the temperature of the power element, the improvement which to a temperature higher than the temperature of the reverse martensite transformation causes the generation of the efforts transferred to the spacer rod by reducing the length of the working force element.



 

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