RU2479372C1 - Press container for forming long tubes and sections - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used for making bulky steel tubes and sections by hot extrusion. Press container comprises outer, medium and inner sleeves, aligned and assembled with fit. Electrically isolated current conducting rods are used for induction heating of container and interconnected in series by means of isolated jumpers. Said jumpers are connected via buses with power supply. Two medium sleeves have grooves extending to sleeve outer surface. Said grooves are made in radius exceeding that of current conducting core by, at least, depth of electrical insulation. Edges of grooves are rounded. Axes of grooves of one medium sleeve are located in one plane with axes of grooves of another medium sleeve. Current conducting cores are arranged in two rows in said grooves.

EFFECT: uniform heating, longer life of container.

3 dwg

Description

The claimed invention relates to the field of metal forming, in particular to the manufacture of bulky pipes and profiles by hot pressing.

An analogue of the invention is a die block with siliceous heaters (Figlin S.Z., Boytsov V.V., Kalpin Yu.G., Kaplin Yu.I. Isothermal deformation of metals. - M.: Mechanical Engineering, 1978, 239 pp. , on pages 43-46, fig. 18). The stamp block consists of upper and lower die inserts installed in muffles, based on sets of spacers and bases. The heating unit is an annular furnace with two round windows in the arch and on the hearth. Holes were drilled in the vault and hearth to accommodate the silicon rods.

The disadvantages of the analogue are the heating of the die block, which is carried out in the direction from the outside to the inside, which leads to heat losses, uneven heating along the radius and increased energy consumption, in addition, the small power of the heaters does not provide heating for large stamp blocks.

The prototype of the invention is a container tube press (see, for example, Ernst Muller. Hydraulic presses for products from non-ferrous metals. - M .: Mechanical Engineering, 1962, p.184-185). The container consists of assembled tightened outer and inner bushings.

Through the outer sleeve is made through longitudinal holes in which the rods of the induction heater of the container are installed. At the ends of these bushings there are annular grooves for the connecting strips of the heater rods, connected through the output busbars of the heater current supply to the power source.

The disadvantages of the press container include the difficulty in making holes due to the removal of the drill from the drilling axis when making holes for the rods of the induction heater of a large container with a height of 2-3 meters, as a result of which defects or significant temperature changes are possible when the container is heated, in addition, there is a weakening the strength of the bushings due to the concentration of stresses at the holes for the rods of the inductors when pressing the bushings and the application of work loads.

The technical result of the invention is to increase the accuracy of the location of the holes for the rods of the induction heater and thereby increase the uniformity of heating, reduce heat loss during heating, increase the durability of the container by reducing the stress concentration in the bushes of the container with rods during its operation.

The technical result is achieved by the fact that in the press container for the manufacture of large pipes and profiles containing coaxially arranged and assembled with interference external, middle and internal bushings and electrically insulated conductive rods for induction heating of the container, sequentially interconnected by electrically insulated jumpers connected via busbars to a source power supply, two middle bushings are made with grooves facing the outer surfaces of the said bushings, while the grooves are made according to The radius exceeding the radius of conducting rod by an amount not less than the thickness of the insulation, and have completed the radial edge slots one middle axis of the sleeve coplanar with the axes of slots average another sleeve and conductive pins mounted in said recesses medium sleeves in two rows.

The proposed container press is presented in figure 1, 2, 3, where:

- figure 1 shows a General view of the container from above;

- figure 2 shows a sectional view through a section;

- figure 3 shows a view I.

The container includes coaxially located and assembled with interference an external sleeve 1, the middle sleeve 2, 3 and the internal sleeve 4. Unlike the prototype, where the inductor rods are placed in through holes made around the circumference in the sleeve itself, in the bushings 2 and 3 are made grooves extending onto the outer surfaces of the bushings for installing rods 5 of induction heaters in them. The rods of induction 5 induction heaters are electrically insulated by bushings 6 and connected in series by jumpers 7. Jumpers 7 are electrically insulated by inserts 8 from the container bushings. The inserts 8 abut against the cover 9. The jumpers 7 are connected to the power supply by buses 10.

The use of the proposed container is as follows.

Before starting work, the container must be collected. For this, the outer sleeve 1 is heated and the middle sleeve 2 is inserted into it. After heating the sleeve block 1-2, the sleeve 3 is installed in them. Then, after heating the sleeve block 1-2-3, the inner sleeve 4 is inserted 4. The rods 5 are inserted into the bushings 2 and 3 induction heater, welded in pairs to the jumpers 7 with electrical insulating sleeves 6 and inserts 8, while the jumpers 7 are located in the sleeves 2 and 3 along concentric circles. From the opposite side, jumpers 7 are mounted on the rods 5, welding them to the rods. The jumpers 7 are electrically insulated by the inserts 8 from the bushings of the container and the lid 9. Between the lid 9 and the insert 8, a thermal gap is provided at the bottom of the container, which decreases when the rods of the inductor and the container are heated. To heat the container through the bus 10, power is supplied. To reduce the heating time and ensure heating to the required temperature, the possibility of two-row arrangement of the rods in two middle bushings is provided.

Thus, the present invention reduces heat loss during heating, increases the uniformity of heating due to a more accurate arrangement of the rods of the induction heater.

Claims (1)

A press container for the manufacture of large-sized pipes and profiles, containing coaxially located and assembled with an interference fit the outer, middle and inner sleeves and electrically insulated conductive rods for induction heating of the container, sequentially interconnected by electrically insulated jumpers connected by busbars to a power source, characterized in that two the middle sleeves are made with grooves extending onto the outer surfaces of the said sleeves, while the grooves are made in a radius greater than MIS conductive rod by an amount not less than the thickness of the insulation, and have completed the radial edge slots one middle axis of the sleeve are arranged in one plane with the axes of slots average another sleeve and conductive pins mounted in said recesses medium sleeves in two rows.

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