Method and device for thixotropic moulding of cylindrical work pieces

FIELD: mechanics.

SUBSTANCE: inventions are referred to metallurgical mechanical engineering and may be used for items production from the cylindrical work pieces, mainly from aluminium alloys by thyxotropic moulding method. The work piece is heated together with a container, where it is put before heating and closed with a cup. The heated work piece is then deformed at press in a pre-heated closed die. The die includes a low semi-die with cavity, kick-off mechanism and upper semi-die fixed to the movable plate. The latter is provided with an open-end cylindrical opening. The heated container together heated work-piece and cup is mounted on the kick-off mechanism lifted above the end side of low semi-die and adjusted along the kick-off mechanism axis. After that the container is step-by-step removed from the working area during intermittent motion of the kick-off mechanism. Then press is closed with the upper semi-die and kick-off mechanism together with work piece and cup is brought to the lower position. Besides it is ensured that the work-piece is placed in the open-end opening of the upper semi-die. Then the cup is removed and work-piece is deformed by the punch setting in the open-end opening of the upper semi-die and in the cavity of the lower semi-die. Finally, the set work-piece is deformed by the upper semi-die and punch to the production of finished item.

EFFECT: increased productivity and quality of finished items, reduced consumption of metal.

2 cl, 7 dwg

 

The invention relates to the field of metallurgical engineering and is used in the manufacture of various products from cylindrical blanks mainly of aluminum alloys using thixotropic forming - texastamera.

Before considering analogues need to give the following explanation. The original billet receive continuous casting under conditions of constant stirring. This forms a suspension (solid-state, in which the ratio of the solid and liquid phases is determined by the heating temperature and depends on the type of material) with globular microstructure that provides a very high fluidity and filling of forms by further processing. This allows to obtain finished products with high mechanical, and hence the operational properties. Texastamera - this process of reheating the cast billet to solid-state and subsequent stamping. Moreover, the temperature and time parameters have very stringent requirements, since this will determine the feasibility of the technology thixoforging and the quality of the finished product. This technology allows you to replace the steel on aluminum alloys makes it possible to reduce energy consumption, reduce weight, and also perform toxostoma on less than m is snych presses. However, the development of this promising areas of Metalworking is constrained by the high cost of cast billets, as well as the complexity of working with solid-source procurement and maintaining its temperature within a narrow interval (metallurgy, mechanical engineering, 2001, No.1, p.36-43).

Famous hot forging steel gears from a cylindrical billet crank press in several transitions (see Amerimanga. "Technology forging". M: mechanical engineering, 1976, RES, str-388). The picture shows a fine stream of stamp open type. The lower matrix made of insert and eject. The upper matrix includes a box, a stationary rod and the ejector.

The disadvantage of this method is the low quality of the finished product, due to the multi-position design stamp that can not withstand the temperature-time parameters of the process. Increased consumption of metal, as used outdoor stamp. Low productivity, which is obvious.

The known method and device for thixoforging cylindrical parts on patent RU 2248857 C2, published 27.03.2005,, VC/38, including the deformation of the pre-heated cylindrical workpiece in a pre-heated die, and a device for implementing this method.

Not the balance of the known technical solution is the need to perform multiple manufacturing operations, that can lead to the possibility of increased time for the process, to reduce the temperature of the workpiece and, as a consequence, performance of manufacturing products, as well as lower quality of finished products.

The technical objective of the claimed method and device is to improve the quality of finished products, performance and reduction of metal consumption. This is achieved by the fact that process - toxostoma perform a single setup preheated initial workpiece and continuously in two stages: sediment and stamping. In addition, all preparatory operations (heating procurement, transportation and installation of a stamp) until the deformation of the workpiece is carried out in the container and the glass. This allows full use of the properties of globular microstructure of the workpiece, as maintained strict temperature and time parameters thixoforging. Referred to the placement of solid billet also eliminates damaging it. The reduction of metal consumption is also an important advantage of the proposed technical solutions, due to the high cost of the original cast billets.

This object is achieved in that the workpiece is placed in a container with inner glass, then heated and ustanavlivaut the plunger on its axis, this lift over the lower end of polimetrica, then during intermittent movement of the pusher consistently disassemble the container, close the stamp on the inner diameter of the lower volumetric top polimetrica omit the pusher with the workpiece in the lower position, placing the latter in end-to-end cylindrical cavity of the upper polimetrica, then remove the glass, rebuff the workpiece by the punch into the cavity of the upper and lower volumetric and finally punched the top of the matrix and the punch of the finished product. The method is implemented by a device, which by means of hydraulic cylinders connected between a movable plate and a press slide, the device is equipped with a container, which is made in the form of two pivotally connected two shoulders arms, on some shoulders are fixed removable arm and on opposite shoulders parallel to the axis of the above-mentioned hinge rigidly mounted two half rings, and inside the last executed jumper, which with the opportunity to interact with the surfaces and dismantling is the glass upside down, and in the lower part of the half-rings of the bore through the cylindrical hole.

The invention is illustrated graphic materials showing:

figure 1 - setting the workpiece in the device;

figure 2 - remove from the akan from the device;

figure 3 - the beginning of the precipitation process;

figure 4 - the beginning of the stamping;

figure 5 - end of the stamping;

6 is a General view of the special container with a glass of;

Fig.7 - section a-a figure 6 (rotated).

Device for thixoforging of the cylindrical workpiece 1 (see figure 1), placed in a special container 2 and the closed glass 3, contains a plunger 4 and the housing 5 with the lower polimetrica 6. Above the bottom polimetrica coaxially she is top polimetrica 7, which is fixed on the movable plate 8. Axis of the upper polimetrica is a through cylindrical hole. Concentric with said hole on the slider 9 is mounted punch 10. The mobile plate and the slider are connected by hydraulic cylinders 11. The punching is carried out on a hydraulic press, a slide which is moved by means of a power piston of the cylinder and the recoil cylinders. The container is manufactured (see Fig.6) two shoulders of the two levers 12, which are connected by a hinge 13. On some shoulders 14 of the arms with bushings 15 with G-shaped grooves and protrusions 16 are mounted removable arm 17. On opposite shoulders 18 of the levers parallel to the axis of the hinge and symmetrically to each other rigidly fixed two half rings 19 with the ridges 20 on the inside (see Fig.7). In the lower part of the half-rings of the bore of the cylindrical socket 21, which interacts with the plunger when installing the title is ovci in the device. All parts of the container and the glass is manufactured from titanium alloy.

The way thixoforging is as follows. The technological process is carried out on a hydraulic press: the maximum force of the power piston cylinder R=4000 kN, the total force of the hydraulic cylinders 12-Pi=800 kN. The press is equipped with sensors and control devices to operate in the automatic mode. The finished product - brake disc. Billet - casting of aluminum alloy AL-9. The workpiece 1 is installed on jumper 20 (see Fig.7) of the container 2 and cover it with a glass of 3, then place the container in a muffle furnace, remove the handle 17 (see Fig.6) and heat the workpiece to 585C. Die tool (pos.6, 7 and 10) is heated to 400C and sprayed him with graphite grease. The device is installed in its original position (see figure 1), namely: raise the slider 10, the lower plate 8 relative to the crawler hydraulic cylinders 11, and the plunger 4 lift over the lower end of polimetrica 6 (depicted to the right of the axis of the pusher). The heated container 2 mounted on the pusher 4, aligning it with the slot 21 (see Fig.7). Raise the plunger 2 and enter the Cup 3 into the hole of the upper polimetrica 7 to a depth of N (shown to the left of the axis of the plunger), which prevents radial displacement of the glass when removing the container. Throw the ring 19, set this just the internals 1 and the glass on the end face of the pusher. Remove the container 2 from the working area. Lower plate 8, cover stamp top polimetrica 7 on the inner diameter of the lower volumetric 6 and the glass workpiece is placed between the plate 8 and slide 9 (see figure 2). Expand the container 2 by 180 (socket 21 up) and place in it the Cup 3, is clamped his half-rings 19. Keep the container in this position, and lowering the plunger in an initial position, set the workpiece in end-to-end axial cylindrical hole of the lower volumetric 5. Then remove the container 2 with the Cup 3. The device is prepared for the deformation of the workpiece. Lower the slider 9 and rebuff the workpiece 1 by the punch 10 in the cylindrical cavity of the upper polimetrica 7, and then into the closed die cavity. This reveals the junction between the flange of the upper volumetric and the lower end of volumetric (see figure 4). Continue to lower the slider 9 and stamp the finished product is top polimetrica 7 and the punch 10. Moreover, the gap h=1...3 mm (see figure 5). For removing the finished product from the upper end of polimetrica 7 (if necessary) raise the slider 9 to the initial position, the lower plate 8 is placed into the cylindrical cavity of the upper polimetrica 7 Rostovka and produce the return stroke of the hydraulic cylinders 11 to the interaction of the plug 10 with the spacer. The finished product - brake disc is removed from the bottom of polimetrica the pusher 4, lifting him above the upper end of the body 5. Process thixoforging cylindrical workpiece is finished.

1. The way thixoforging cylindrical workpieces, including deformation of the pre-heated cylindrical workpiece in a preheated die, characterized in that the deformation is carried out on the press in closed die containing the lower bolometric with the cavity, the punch, the ejector and is fixed on the movable plate, kinematically connected with the press slide, the upper polimetrica, which has a through cylindrical hole and ensuring closure of the stamp on the inner diameter of the lower volumetric, and deform the cylindrical billet preheated together with the container in which it is placed before the heat and close glass, heated mentioned container with the heated workpiece and mounted on glass the pusher is raised above the lower end of polimetrica, and have along the axis of the pusher, and then during intermittent movement of the pusher consistently remove the container from the working area, close stamp top polimetrica and lower plunger with a cylindrical workpiece and a glass in the lower position with the placement of cylindrical workpieces in end-to-end cylindrical hole of the upper paluma the matrix, then remove the glass and deform the cylindrical blank by upsetting punch in the above-mentioned end-to-end cylindrical hole of the upper polimetrica and in the cavity of the lower volumetric and upset billet permanently deform the upper polimetrica and punch with obtaining the finished product.

2. Device for thixoforging cylindrical workpieces, characterized in that it comprises associated with the press slide by means of a hydraulic cylinder movable plate on which is fixed the upper polimetrica made with a through cylindrical bore mounted on the press slide concentric with said hole punch, the body with the lower polimetrica located coaxially top polimetrica and is made with a cavity, an ejector, a container for cylindrical billet made in the form of two pivotally connected levers, removable arms, pinned on one shoulder mentioned two shoulders arms, the two half-rings rigidly mounted on the opposite shoulders of the two shoulders of the levers parallel to the axis of the connecting hinge, and glass, and half performed placed in them jumpers for placing the Cup upside down and a cylindrical socket in the bottom for centering the container relative to the plunger, and the upper polimetrica us who analena with the possibility of translational movement relative to the lower volumetric.



 

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