SU1514578A2 - Device for abrasive working of parts - Google Patents

Description

The invention relates to a machine tool, in particular to a device for finishing and grinding free abrasive of parts having surfaces of a complex profile. Purpose

of the invention is the intensification of the process of abrasive machining of parts. The device contains working chambers 1 and 2 with abrasive mass. Item 3, installed in the fixture 4, is located between chambers 1 and 2. To create an overpressure, the device is equipped with an additional chamber 14 with an abrasive mass and a reciprocating movement in the form of a cylinder 16. The pistons of the chamber 14 and the cylinder 16 are connected by a common rod. The device intensifies the process of abrasive machining of parts, especially on operations for removing dust and cleaning surfaces. 1 nl

1514578

1514578

The invention relates to machine tools, in particular to devices for finishing and grinding free abrasive parts, having a complex surface profile, grooves, burrs (disks, impellers, body parts, etc.).

The purpose of the invention is the intensification of the process of abrasive machining of parts.

The drawing shows a device for abrasive machining of parts with the supply of abrasive mass from the outside.

The device contains working chambers 1 and 2 with abrasive mass, located in such a way that the part 3, reinforced in the device 4, is located between them. The rods 5 and 6 of the pistons of the working chambers with the help of hinged joints that allow a slight misalignment of the axes are rigidly connected to the frame 7, which has the ability to reciprocate from the common hydraulic cylinder 8 to the 9 and 10 hydraulic cylinders. Limit switches 12 and 13 are used to fix the 'extreme positions of the working chamber pistons and are connected to the system of automatic control of the device.

In addition, to create an increased pressure in the space bounded by the pistons of the working chambers, there is an additional chamber 14 with abrasive mass 5 associated with this space by pipeline 15. The piston of the additional chamber is connected to the piston of the hydraulic cylinder 16 working from a separate pump located at the hydraulic station 11 .

The device works as follows.

The working fluid (oil) is pumped by the hydraulic station 11 under pressure into the lower cavity of the hydraulic cylinder 8, moving the piston to the upper position. Together with the hydraulic cylinder piston, the frame 7 and the pistons of working chambers 1 and 2 rigidly connected with it move the abrasive mass through the cavities of the workpiece 3. At the same time, the second pump of the hydraulic station 11 pumps the working fluid under pressure into the lower cavity of the hydraulic cylinder 16, moving the piston additional chamber 14 and feeding the abrasive mass into the space between the pistons of the working chambers 1 and 2

devices. In this case, the specific pressure under which the abrasive mass is supplied must exceed the specific pressure exerted on the abrasive mass by the pistons of the working chambers.

When the working chamber pistons approach the upper extreme position, the limit switch 12 is triggered, giving a command through the automation scheme to change the direction of movement. The movement of the frame 7 occurs in the opposite direction to the position when the lower limit switch 13 is triggered and the cycle repeats.

An example. The processing of parts was carried out on a laboratory abrasive extrusion unit of the AES-1 model, equipped with a chamber with a separate hydraulic cylinder. The diameter of this cylinder is equal to the diameter of the cylinder of the piston drive of the working chambers, and the diameter of the additional chamber with an abrasive mass is less than the diameter of the working chamber (the diameters of the hydraulic cylinders are 150 mm, and the diameters of the additional and working chambers are 245 and 250 mm, respectively).

Discs of heat-resistant alloy ХН77Т10Р according to GOST 5632-72 were processed in order to remove burrs in the grooves after machining. Burr size 0.5-1.1 mm.

Previously, a similar detail was processed on the same laboratory setup with the optional camera disconnected.

In both cases, the following regime of abrasive-extrusion processing was observed: the oil pressure in the hydrocyclical working chambers was 6.3 MPa, the oil pressure in the hydraulic cylinder of the additional chamber was 6.3 MPa, the piston speed of the working chamber was 0.21 m / s, the processing time, 240 s abrasive mass - base rubber SKT GOST 1468079; abrasive-grinding 24A number 50 GOST 3647-80 / abrasive content 55%.

The proposed device intensifies the process of abrasive machining of parts, especially on operations for removing burrs and cleaning surfaces, increases productivity by 2-3 times by eliminating the need to recharge the installation chambers from one abrasive mass to another, makes it possible to mechanize manual labor when removing burrs and

1514578

cleaning of surfaces of parts of complex shape.

Claims (1)

The device for abrasive machining of parts by author. ev No. 1220755, characterized in that, in order to intensify the process of abrasive machining of parts, the device is equipped with an additional chamber for accommodating abrasive mass associated with the space between the pistons and the additional drive of reciprocating movement, which are made in the form of cylinders with pistons connected by a common rod.