SU751467A1 - Apparatus for rotary extrusion - Google Patents

Description

one

The invention relates to the field of engineering, namely, devices for rotary extrusion with heating of the workpiece mainly of thick-walled material.

A device for rotary extrusion is known, comprising a caliper with a tool mounted on a frame and a heater with a moving mechanism.

1.10

A disadvantage of the known device is the impossibility of processing thick-walled} first blanks from a material with a low thermal conductivity coefficient.

The aim of the invention is to expand the i5 technological capabilities of the device by ensuring the processing of thick-walled blanks of material with a low thermal conductivity coefficient.

This goal is achieved by the fact that the device for rotational extrusion is equipped with an indicator of the position of the heater and a mechanism for synchronizing the movement of the actuator and the heater, and the heater is designed as a plasmatron 25 of direct action.

FIG. 1 shows the described device, a general view; in fig. 2 - the device from the side of the assigned clamping

center; in fig. 3 - heating by two plasmatrons (view from the center of the pressure center); in fig. 4 - successive stages of forming a part with a flange.

On frame 1 in spindle 2, anchoring 3 is secured. A blank 4 of sheet material is pressed against the mandrel by a rotating presser center 5 with a gasket of thermal insulation material 6. The presser center is attached in the tailstock 7. The transversely displaced roller holder 10. For feeding the instantaneous action of the plasmatron 11, an adjustable power source 12 with a 30 hectare system and a water supply (gas cylinder 13, hoses 14 for water and gas) is used. The synchronization mechanism of the motion indicator and the heater is made in the form of rotating wheels 15 and 16. The cholesko 16 is connected by rods 17 and 18 to the turning unit 19, on which the position indicator 20 of the plasma torch is mounted.

Claims (1)

The indicator is made of a plate and in shape follows the contours of the plasma torch section. A knob 21 is rigidly connected to the indicator to move the plasma torus to a flush mounted button (not shown), which serves to turn off the electric coupling, which disconnects the output wheel of the reducer of the DBG drive drive. The wheel 15 is connected by rods 22 and 23 with the rotation unit 24 of the plasma gun and interact with the gear 25 of the drive motor gearbox (not shown). The possibility of reversing the rotation of the wrapping gear 25 is limited by limit switches 26 and 27. This synchronization mechanism is fixed on the slide 28, mixing them along the axis of the workpiece axis. Plasma torch 11 is connected to a power source with power wires, stirring in the hoses with cooling water. The positive pole of the power source through a power cable, a current collector (not shown), a cord 29, a mandrel 3 is connected to the rolling part. The device has a control panel 30 that is used to initiate the arc, adjust its power and disconnect it. The device works as follows. The spindle 2 drive and power source 12 are turned on. Plasma torch 11 is brought to workpiece 4 at a distance of 30-40 mm by handle 21 while simultaneously pressing a button on it (while pressing the button, gear 25 is disconnected from the gearbox). When the button is released and the source of nitanes 12 is turned on, the nasmatron 11 and the indicator 20 perform oscillatory movements. When the start button is pressed, the arc discharge between the plasmaplant cathode and the workpiece is excited. On the workpiece, a warming up of the area is carried out, the dimensions of which are regulated by changing the position of the coic switches. In order to warm the surface that is not exposed to the arc, the indicator 20 is redirected to a non-heated area. After the heating of the entire workpiece to a temperature at which the plasticity of the material increases significantly, a spinning roller is rolled. To maintain the optimum temperature of the heated billet 4, the power is regulated at 751 5 10 15 20 25 30 35 40 45 7 by pressing the cushions located on the control panel 30. During the shaping process, the crusher can perform heating at any place of the billet by turning and moving the control knob. A pressure roller with a small radius is used to align the flange at the end of the running-in operation. In order to reduce the time of ignition of the workpiece, a device was tested for extrusion with ignition by two plasmatrons of the same effect. In this case, the two arcs were electrically connected through the material of the part. There is no need for a current collector and media bus. The management of process and ignition and running is left unchanged. This method of heating makes it possible to disperse the heat flux from the arcs to a large surface and is especially useful in cases where metals with low thermal diffusivity are subjected to extrusion. The use of the proposed device for rotational extrusion of parts of tin "cup," cup with flange made it possible to obtain parts from blanks of thick steaks up to 16 mm and with a diameter up to 800 mm. Such a diameter of the workpiece was limited only by the base of the flock. The longest iagreva time of the workpiece before starting the run-in 2, 5 min. The invention The device for rotational extrusion, containing a caliper with a tool and a heater with a displacement mechanism mounted on a bed, differs from Hj, so that, in order to expand technological capabilities, it is equipped with an indicator of the heater and a heater and synchronization mechanism for moving the indicator and the heater, and B is made in the form of a direct action plasmatron. Sources of information taken into account during the examination 1. USSR author's certificate L 402410, cl. In 21D 19/12, 1971.