RU220184U1 - Device for forming friction surface microrelief - Google Patents

Abstract

The utility model relates to the cold processing of metals and alloys by the method of surface plastic deformation and can be used to form a discrete microrelief of the rubbing cylindrical surfaces of machine parts. A device for forming a microrelief of the friction surface of a part contains a knurling disk with form-building protrusions applied on its working surface corresponding to the shape and pitch of the discrete microrelief applied to the surface being processed, a drive for rotating the knurling disk in the form of a stepper motor, an abrasive belt and a unit for pressing the abrasive belt to the surface being processed. The clamping unit is made in the form of a cylindrical hinge, the fixed part of which is intended for installation of the workpiece. On the moving part of the clamping unit there is a knurling disk and a programmable stepper motor rotating it. Between both parts of the hinge there is a rigid stop, to which the movable part of the hinge is pressed by means of a power mechanism in the form of a pneumatic or hydraulic cylinder. The formation of microrelief depth for processing surfaces of various diameters is ensured. 2 ill.

Description

The utility model relates to the cold processing of metals and alloys by the method of surface plastic deformation and can be used to form a discrete microrelief of the rubbing cylindrical surfaces of machine parts.

A known device for vibration rolling according to a.s. SU No. 1466917, IPC V24V 39/04 (2000.01), publ. 03/23/1989, Bulletin. No. 11 and the method of forming a friction surface according to a.s. SU No. 2 1493444, IPC V24 V 39/00 (2000.01), publ. 07/15/1989, Bulletin. No. 26, in which the formation of a regular microrelief occurs when the cylindrical surface being processed is simultaneously exposed to two deforming elements (DE) - balls of different diameters. When vibrating the surface, a working DE with a smaller radius forms the profile and dimensions of the sinusoidal grooves of the microrelief, and a DE with a larger radius crushes, rolls out the sagging formed along the edges of the grooves to the height of the original roughness (AS No. 1466917) or completely smoothes out the sagging and the initial microrelief between sinusoidal grooves (AS No. 1493444), strengthening the entire surface of the part.

The disadvantages of this method and device are the following: the complexity and bulkiness of the design, the presence of two drives for each DE, providing additional reciprocating movements - oscillation, labor intensity in manufacturing and setting up the device.

A device is known for finishing processing of complex shaped surfaces by surface plastic deformation according to the utility model patent RU No. 24410 MPK V24V 39/00 (2000.01), publ. 08/10/2002 Bulletin. No. 22. It contains a loading mechanism consisting of leaf springs with mandrels installed on them, carrying deforming elements - an indenter and a ball located at an angle of 180° relative to each other, an oscillation mechanism consisting of a drive and end cams.

The disadvantage of this device is the complexity of the design and low performance.

A device is known for finishing and strengthening treatment of the rubbing surfaces of machine parts according to the utility model patent RU No. 64126, B24B 39/00 (2006.01), publ. 06/27/2007 Bulletin. No. 18, containing a loading mechanism consisting of leaf springs with mandrels installed on them, carrying deforming elements - an indenter and a ball, located at an angle of 180° relative to each other; an oscillation mechanism consisting of a drive and end cams mounted on the drive shaft. The end cams are made in the form of flat elements with protrusions on the plane, forming a sinusoidal surface that provides various oscillations of the indenter and the ball, contacting the free ends of the levers, the other ends of which are attached to the leaf springs at the installation site of the mandrels carrying the indenter and the ball.

The disadvantages of this device are the complexity of the design, the need to use expensive equipment such as a lathe, and low productivity.

A device for vibration treatment of the surfaces of parts is known according to the utility model patent RU No. 113686 MPK V24V 39/00 (2006.01), publ. 02/27/2012 Bulletin. No. 6, consisting of a base on which a reciprocating motion drive and a housing with a holder placed in it are installed, on which a section with low transverse rigidity is made and there is a detachable L-shaped section containing a vertical part in the form of a rod with a tool offset relative to holder swing axis. An L-shaped bushing with a hole, the length of which is equal to the length of the rod, is installed on the holder rod, made with an elongated generatrix. The bushing is designed to move along the axis of the rod and be fixed in the required position by means of a screw located in the lower part of the bushing.

The disadvantage of this device is the complexity of the design and low processing performance.

The prototype of the proposed device is a device for forming a microrelief of a friction surface, containing a knurling disk with form-building protrusions applied on its working surface corresponding to the shape and pitch of a discrete microrelief applied to the surface being treated, an abrasive tape, and a unit for pressing the abrasive tape to the surface being processed (utility model patent No. 202108 IPC V24V 21/00 (2006.01) published 02.02.2021 Bulletin No. 4). The knurling disk is made with an annular cutout with a depth greater than the thickness of the abrasive belt and a central angle ensuring equality of the lengths of the circular arcs of the working part of the knurling disk and the workpiece surface.

The disadvantage of the prototype is the difficulty of forming the depth of the microrelief, which has a great influence on the quality of the processed surface, and limited technological capabilities, since the device is intended for processing only one standard size of parts.

The purpose of the utility model is to improve the quality of processing and expand its technological capabilities.

The technical result of the utility model is the ability to regulate the formation of microrelief depth and its use for processing surfaces of various diameters.

The task is achieved by the fact that in a device for forming a microrelief of the friction surface of a part, containing a knurling disk with form-building protrusions applied on its working surface corresponding to the shape and pitch of the discrete microrelief applied to the surface being processed, a drive for rotating the knurling disk in the form of a stepper motor, an abrasive belt, and a unit for pressing the abrasive belt to the surface being treated, the clamping unit is made in the form of a cylindrical hinge, on the fixed part of which the workpiece is installed, and on the moving part there is a knurling disk and a programmable stepper motor rotating it; between both parts of the hinge there is a rigid stop, against which the the movable part of the hinge using a power mechanism in the form of a pneumatic or hydraulic cylinder.

Since the clamping unit is made in the form of a cylindrical hinge, on the stationary part of which the workpiece is installed, and on the moving part there is a knurling disk and a programmable stepper motor rotating it, and between both parts of the hinge there is a rigid stop, to which the movable part of the hinge is pressed using a force devices in the form of a pneumatic or hydraulic cylinder of a knurling disk, then a simple replacement of the hard stop allows the processing of parts of various standard sizes and allows for each standard size of the part to highly accurately adjust the process of forming a given depth of a discrete microrelief. This solves the problem of improving the quality of processing and expanding the technological capabilities of the utility model.

In fig. Figure 1 shows a device for forming a friction surface microrelief, side view; FIG. 2 - cross section of the device.

The device is a cylindrical hinge consisting of a fixed part 1 and a movable part 3 rotating on a pin 2 (Fig. 1, 2). On the fixed part 1 of the hinge, a cylindrical workpiece 5 is installed on supporting rollers 4 with the possibility of free rotation. On the moving part 3 of the hinge, opposite the workpiece 5, a knurling disk 6 is installed. The knurling disk 1 has a rotation drive in the form of a programmable stepper motor 7 (Fig. 1) . Between the knurling disk 6 and the workpiece 5 there is an abrasive belt 8, facing the workpiece 5 with its working surface. At the end of the fixed part 1 of the hinge there is a fixed stop 9, to which the movable part 3 of the hinge is pressed using a power mechanism 10. The power mechanism 10 is made in the form of a pneumatic or hydraulic cylinder. The device works as follows.

In the initial non-working position, the movable part 3 of the hinge, using a power mechanism 10, is turned upward on the axle 3 (not shown), and the workpiece 5 is installed on the supporting rollers 4. On the opposite side, the part 5 is held by hand or a prism (not shown in Fig. 1). ). In addition, a fixed stop 9 with a pre-calibrated thickness equal to:

where Δ is the thickness of the fixed stop, mm; L - distance from the trunnion to the stop, mm; D and d are the diameters of the knurling disk and the workpiece surface, respectively, mm; d _r - diameter of support rollers, mm; t is the thickness of the abrasive tape, mm; h - required depth of discrete microrelief, mm; z - elastic transverse deformation of the abrasive belt, mm; b - distance from the trunnion axis to the axis of the knurling disk, mm; c - distance from the trunnion axis to the axis of the supporting rollers, mm; - distance between the axes of the supporting rollers, mm; u is the distance from the trunnion axis to the lower plane of the moving part of the hinge, mm; k is the distance from the trunnion axis to the upper plane of the fixed part of the hinge, mm.

Using the power mechanism 10, the movable part 3 of the hinge is rotated to the fixed stop 9, so that the knurling disk 6 presses the abrasive belt 8 to the workpiece surface 5. The thickness of the fixed stop 9 is pre-selected so that the abrasive grains of the abrasive belt 8 are embedded in the workpiece surface 5 to a given depth h.

The rotation of the programmable stepper motor 7 is turned on, which rotates the knurling disk 6 around its axis at an angle equal to:

α=2πd/D, rad.

Due to the friction forces, together with the knurling disk 6, the abrasive belt 8 moves and the part 5 rotates. The form-forming protrusions of the knurling disk 6 act on the abrasive belt 8, the grains of which are pressed into the processed surface of the part 5 to a depth h, forming a discrete microrelief.

After the knurling disk 6 rotates through an angle a, the surface treatment process of the part 5 automatically stops. The power mechanism 10 turns the movable part 3 of the hinge counterclockwise, the knurling disk 6 is moved away from the workpiece surface of the part 5, and the part 5 is removed. The cycle is repeated.

If it is necessary to process parts of other sizes, change the fixed stops 9, which are pre-made with the required height for each standard size of the part. Thus, the technological capabilities of the utility model are expanded and the specified depth of discrete microrelief is achieved, ensuring improved processing quality.

Claims (1)

A device for forming a microrelief of the friction surface of a part, containing a knurling disk with form-building protrusions applied on its working surface corresponding to the shape and pitch of the discrete microrelief applied to the surface being processed, a drive for rotating the knurling disk in the form of a stepper motor, an abrasive belt and a unit for pressing the abrasive belt to the surface being processed , characterized in that the clamping unit is made in the form of a cylindrical hinge, the stationary part of which is intended for installing the workpiece, and on the movable part there is a knurling disk and a programmable stepper motor rotating it, while between both parts of the hinge there is a rigid stop to which the movable one is pressed part of the hinge using a power mechanism in the form of a pneumatic or hydraulic cylinder.

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