SU946725A2 - Coil production method - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of coils.

On the main evt.Sv. No. 844100, a method of making coils is known, consisting of preheating the working medium to a temperature not exceeding the melting temperature of the metal coil, securing near the mandrel and subsequent winding of the pipe on the mandrel by applying a bending force to the pipe end, and use the working environment, which is moved in the process of bending inside the pipe and discharged from the free end of the pipe at the right angle to the pipe C, however, the quality of the final product / i.e. the coil made by this method is not high enough.

The purpose of the invention is to improve the quality of products.

To achieve this goal, in a method, before the flexible working medium is fed into the pipe, the pipe material is heated to a temperature not exceeding the melting temperature, and after the bending, the tube inside the tube is filled with cooling agent.

The drawing schematically shows a circuit for carrying out the proposed method.

Example. For the manufacture of the coil, they take the tube 0 9 with the internal f7 from impact-resistant polystyrene, mark UPS-0505, and as

10 working medium - water at TeNmepaType t, and pressure P 3 kg / s. Named polystyrene has a Vick softening temperature in a liquid medium t.

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The coil of the specified material is bent according to a scheme consisting of a curled tube 1, a tip 2 directed opposite to the mandrel 3, an em20 of bone 4 with hot WATER, a valve 5, a connecting tube 6, a cold water tank 7, 8, pressure control lines 9 in tanks 4 and 7.

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With the valve 5 open and the valve 8 closed, the coil material is heated as a result of the outflow of hot water from the tip 2 to the atmosphere, mainly in the form of

30 wet steam. As the coil material is heated, the polystyrene softens and increases its tendency to plastic deformation. Approximately 10 seconds later, the temperature of the coil material is as close as possible to the initial temperature of the working medium in the tank (the established temperature level of the coil material is reached) and the tip 2 is completely flexible around the mandrel 3 without changing the cross section of the curled tube. At the end of the curl, valve 5 closes and at the same time valve 8 opens. Cold water from tank 7 enters the coil and cools it to its original (room) temperature (Tours. This keeps the original cross-sectional shape of the coil unchanged during the cooling process.

The physical essence of the way 5a is as follows.

The flexible tube material softened as a result of heating is carried out by a less reactive force of the outflowing working medium due to an increase in plastic deformation of the material.

To maintain the initial cross-sectional shape of the tube, it is necessary to reduce the temperature of the coil material to the initial one after bending. (room) level until the pressure of the working medium is released, which is carried out by passing through the protective tube a cold working medium (water from the tank 7 under the action of the same pressure (P 3 kg / cm) as the amp amp capacity 4).

The proposed method will improve the quality of the coils ..

Claims (1)

Invention Formula The method of manufacture of coils auth.St. 844100, characterized in that, in order to improve the quality of the products, the heated working medium is fed into the pipe before heating, heating the pipe material to a temperature not exceeding the melting temperature, and after bending the internal cavity of the pipe fills k) T with a coolant. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 844100, cl. In 21 D It / On, 09/17/78 (prototype).