The method of obtaining products directional solidification and device for its implementation

 

(57) Abstract:

The invention relates to the turbines, in particular the production of parts for gas turbine engines directional solidification and can be used in the optical industry, semiconductor technology and chemical technology. The method differs in that the seed in the process of vertical extraction additionally result in horizontal reciprocating movement relative to the surface of the melt along the axis of rotation of this seed change the position of the point of return and scope of these reciprocating movements in accordance with the profile of the product. The method is carried out in the device, with the crucible in the form of a U-shaped tube over one end of which has a means for feeding the material, and on the other - structurally mounted rotatably around a horizontal axis and connected with means for reciprocating movement along this axis. Perhaps getting stronger turbine disks complex form along with the shaft. 2 S. p. f-crystals, 5 Il.

The invention relates to the turbines, in particular the production of parts for gas turbine engines methods napravlennoi engineering and chemical technology.

A known method of manufacturing parts in the form of bodies of revolution directional solidification of the melt, consisting in the preparation of the melt, bringing into contact with the melt priming, rotating around a horizontal axis, the temperature of the melt and pulling vertically seed and kristallisoituu details on it.

This method is adopted for the prototype, by using the known device, comprising the following main characteristic elements: the heater, the material to melt, a seed crystal and its holder, the movement mechanisms of the seed vertically and rotation around the axis of the control device of the heater and the movement mechanisms of the seed, the crucible to melt. In this device the material to be melted is placed in the crucible [1]

Prototype method can also be implemented using a device, such as a heater material to melt, the crucible, the seed, the mechanism for moving the seed vertically, the control device of the heater and the movement mechanisms of seed, and even special shaper placed in the cavity of the crucible [2]

A device that can be used to implement the prototype method and videographies, creating on the upper end of the original billet narrow molten zone, which extends up vertically seed and newly formed therein crystalline product [2]

The disadvantage of this method and device is the inability to form the disk complex profile together with the turbine shaft.

The purpose of this technical solution is the production of more durable turbine disks with spiral distribution of the elements of the microstructure due to the performance of the whole turbine shaft with the drive of a complex profile.

To achieve this goal the seed in the process of vertical extraction result in a reciprocating horizontal movement relative to the melt, the scope of the move which is set in accordance with a preset profile of the parts being manufactured.

The device for implementing the method supplemented by the mechanism of the reciprocating movement of the seed horizontally, the crucible is made in the form of a U-shaped tube, one end of which is mounted a hopper with powder material feeding, and over other seed.

The crucible is made in the form of a hollow body of rotation and installed vozmojnostey crucible in the direction of the seed and the hopper with powder material feed is offset from the axis of rotation of the crucible in the opposite direction.

The device for implementing the method, consisting of a heater around the remelted ingot, seed and mechanism for vertical movement of this piece, supplemented by the mechanism of the reciprocating movement of the seed horizontally.

Essentially the new criterion of the proposed method, directional solidification, is a combination of vertical movement and rotation of the seed with its reciprocating movement horizontally relative to the melt. This combination allows you to create complex surfaces of solids of revolution, the profile of which is provided by a combination of individual movements.

The method allows to produce parts of gas turbine engine disks complex profiles in one piece with the turbine shaft.

The invention is illustrated by drawings.

In Fig. 1 shows a diagram of the device with the crucible in a U-shape to implement the method of directional crystallization of Fig. 2 the device melts the workpiece to implement the methods of Fig. 3 diagram of the means for moving satrak is S="ptx2">

The main elements of multiple devices for the implementation of the proposed method are adjustable power heater 1, material 2 in the form of a powder or strip (Fig. 2) for the preparation of the working of the melt 3, the seed crystal 4, the tool moves priming 5, system 6 motion control seed and formed on her articles 7 and coherent presentation of material 2 for the preparation of the melt. This material is fed from hopper 8, if it is a powder material ( Fig. 1) or from the guide 9, if the material is pre-skorrektiroval in the band (Fig. 2). In the first case, the powder is U-shaped newesely the crucible 10 (Fig. 1), in a narrow elbow 11 which is placed a work melt 3 In the second case, the strip 2 as far as pulling the seed crystal and formed on her articles 7 moves up vertically with the feed mechanism 12.

The means 5 for moving the seed crystal 4 with its holder 13 includes shafts 14 and 15, is fixed in the housing 16, the gears 17 and 18, the actuator 19 spins seed, the drive mechanism 20 moves 21 priming vertical actuator 22 and the mechanism 23 of the reciprocating movement of the seed horizontally.

The unit is mounted in a sealed chamber, equipped with systemsmodel downloading the source material 2 devices crystallization. The chamber is pressurized, vacuum, filled with a protective gas. Serves power to the heater 1, prepare a work melt 3. A seed crystal 4 is brought into contact with the melt 3 and podpravlyat, rotating around a horizontal axis. Bring the seed in a reciprocating movement along the horizontal axis with a scale equal to the specified length "l" formed by the shaft. Regulate the working temperature of the melt by changing the power of the heater and pull the seed vertically upwards. Keep track of the process, fill material 2, the melt 3 is released during crystallization of the shaft, form the shaft. Then for a given program change the amplitude of the movement of seed and formed on NAF products from the values of l1to l>2(Fig. 4), while continuing the extrusion. In this form a complex profile of the turbine disk. Finish the process of crystallization at constant amplitude of displacement l2forming area of the turbine disk of constant thickness l2and given diameter D (Fig. 5). Increase 2.5 to 3 times the speed of pulling of the seed crystal and the frequency of its rotation, tearing the melt under the product. Turn off the heater, cool product, lasermedizin the camera and extract from it th and Y2O3a given composition, close to electric. Carry out preparatory operations (installation in the holder and aligning the seed, shaper, sealing equipment, vacuum and inert gas filling, prepare the melt. Lead a seed crystal into contact with the melt. Rotate the seed around a horizontal axis lead her into the reciprocating movement of the horizontally and extend vertically upward, forming a shaft with a diameter of 70 mm and a length of 80 mm, while by feeding the powder from the hopper specified level of the melt in the crucible is rotated around the vertical axis. Regulate the temperature of the melt by changing the heating power and the amplitude of the reciprocating movement of the seed horizontally form the turbine disk to the specified profile, with a maximum diameter D of 200 mm

P R I m m e R 2. The source of the workpiece in the form of a strip width of 20 mm and 2.5 mm thick, prepared from a mixture of powders of Al2O3, ZrO2and Y2O3a given composition close to the eutectic, enter through the vacuum valve in the chamber. Perform other preparatory operations as in example 1. Preparing a molten zone at the upper end the aspects of moving horizontally and extend vertically upwards. As in example 1 to form a first shaft with a diameter of 70 mm and a length of 80 mm, and then the disk complex profile with a diameter of 200 mm In the crystallization process of the shaft and drive at a speed consistent with the speed of crystallization, move up vertically to the workpiece.

In both cases, made of high strength discs complex profile along with ceramic shafts. The accuracy of the given geometry products 0.6 mm vs. (2-3,5)mm in the products obtained by the method prototype.

Technical and economic efficiency of the present invention is to improve the efficiency of technological process of manufacturing of turbine disks in one piece with the turbine shaft by way of layering kristallizirovan material, and the strength of the monolithic structure is significantly increased.

1. The method of obtaining products directional solidification, including vertical pulling from the melt, the seed simultaneous rotation around a horizontal axis, characterized in that the seed in the process of vertical extraction yield additional horizontal reciprocating movement relative to the surface of the melt along the axis of rotation of this straw is Delia.

2. Device for the production of directional solidification, containing the crucible to melt structurally mounted for rotation and vertical movement, and means for feeding into the crucible feed material, characterized in that the crucible is made in the form of a U-shaped tube, one end of which has a means for feeding the material, and on the other structurally, with the possibility of additional rotation around a horizontal axis and connected with means for reciprocating movement along this axis.

 

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